## URS Corporation

Iron Hill Corporate Center 4051 Ogletown Road, Suite 300 Newark, DE 19713 

# Quarterly MOU Status Report #20 Phase II Monitoring/Sampling Work Plan DuPont Washington Works (OPPT-2004-0113 PFOA Site-Related Environmental Assessment Program)

Date: November 3, 2010 Project No.: 18985890.10007Quarterly MOU Status Report #20 Phase II Monitoring/Sampling Work Plan 

## Table of Contents

20QMOU 110310 

### i Newark, DE November 3, 2010 OPPT-2004-0113 PFOA Site-Related Environmental Assessment Program 

# Table of Contents

1.0 Quarterly MOU Status Report #20 .............................................................................1

2.0 Updated Data Tables and Figures...............................................................................2Quarterly MOU Status Report #20 Phase II Monitoring/Sampling Work Plan 

## Quarterly MOU Status Report #20

20QMOU 110310 

### 1 Wilmington, DE November 3, 2010 OPPT-2004-0113 PFOA Site-Related Environmental Assessment Program 

# 1.0 Quarterly MOU Status Report #20

On November 3, 2005, a Memorandum of Understanding (MOU) was entered into between the United States Environmental Prot ection Agency (EPA) and E. I. du Pont de Nemours and Company (DuPont) for a Perfl uorooctanoic Acid (PFOA) Site-Related Environmental Assessment Program. This MOU memorializes the DuPont commitment to engage in a screening level PFOA Site -Related Environmental Assessment Program that will provide EPA with additional medi a-specific monitoring of PFOA on and around the DuPont Washington Works Site in West Vi rginia. There are three DuPont owned and operated landfills that are included in this Program, the Local Landfill, the Dry Run Landfill and the Letart Landfill. This Program aims to gather data and other information to address in part the Charge [as set forth in the MOU (Section V.A.1-3)]. One of the reporting requirements of the MOU is the submission of quarterly status reports. Section V.B.3 of the MOU descri bes the status report requirements. Specifically, the Company will provide the EPA w ith a status report on a quarterly basis. The first such status report is due three months after th e effective date of the MOU (November 3, 2005). Each status report sh all contain a brief description of the implementation status of the Phase II Monitoring/Sampling Work Plan (Work Plan) and shall include a copy of all anal ytical reports, survey reports, and other reports that have been completed and received by the Company, pursuant to the Work Plan, 30 days prior to the deadline for that status report. This report is the 20 th

## quarterly MOU status report. The format of this report, and future quarterly MOU status reports (starting with the 12 th

## quarterly MOU status report), has been modified compared to previous reports because all Phase II MOU related activities have been completed and the Assessments have been submitted to EPA. The data reported in this and future quarterly MOU status reports are not part of the Phase II MOU monitoring activities. Reporting of this data is not required by the MOU, but is provided here by DuPont for completeness of study. This report consists primarily of updated data tables. Table numbers for the tables included here are the same as in the Quarterly MOU Status Report #11 (dated August 1, 2008) and most figures related to these tables can be found in the Work Plan or in the Quarterly MOU Status Report #11. Tables are no longer included in the quarterly monitoring reports when the program is complete and no further updates will occur. Tables 4.2, 4.4, 4.6 and 4.8A have not required updating since the la st report, but are included here as the programs are not comple te and these tables may be updated in the future. Table 4.9 has been updated and new information for Bedilion, Goodwin and LaFrance is highlighted in yellow. Tables 4.1, 4.3, 4.5, 4.8 and 4.10, and Tables 5.1 through 5.12 include new monitoring data for almo st every location in these tables. Also included in this quarterly MOU status re port are Figures 4.1 and 4.2, which provide the locations of all residential GAC treatment syst ems in Ohio and West Virginia included in Tables 4.2 through 4.5, 4.8 and 4.10.Quarterly MOU Status Report #20 Phase II Monitoring/Sampling Work Plan 

## Updated Data Tables and Figures

20QMOU 110310 

### 2 Wilmington, DE November 3, 2010 OPPT-2004-0113 PFOA Site-Related Environmental Assessment Program 

# 2.0 Updated Data Tables and Figures

The following tables and figures are attached:

• 

## Table 4.1 APFO and PFOA Results for Public Water Supply Sampling, West Virginia and Ohio

• 

## Table 4.2 Residential GAC Systems, West Virginia – Historic Data

• 

## Table 4.3 Residential Treatment Resu lts, West Virginia – GAC System Samples

• 

## Table 4.4 Residential GAC Syst ems, Ohio – Historic Data

• 

## Table 4.5 Residential Treatment Re sults, Ohio – GAC System Samples

• 

## Table 4.6 Status of Residents Qual ified for GAC Treatment Receiving Alternative Treatment

• 

## Table 4.8 Order on Consent Phase I – Historic and GAC System Samples

• 

## Table 4.8A Status of Order on Consent Phase I Residents Qualified for GAC Treatment Receiving Alternative Treatment

• 

## Table 4.9 Status of Private Water Systems Identified by EPA and DuPont (March 2009 Order on Consent)

• 

## Table 4.10 March 2009 Order on Consent – Historic and GAC System Samples

• 

## Table 5.1 Local Landfill Monitoring Well Construction and Groundwater Elevation Data

• 

## Table 5.2 Letart Landfill Monitori ng Well Construction and Groundwater Elevation Data

• 

## Table 5.3 Dry Run Landfill Monitoring Well Construction Data and Groundwater Elevation Data

• 

## Table 5.4 DuPont Washington Works S ite APFO in Surface Water Outlets 102 and 305

• 

## Table 5.5 DuPont Washington Works Site APFO and PFOA in Surface Water

• 

## Table 5.6 DuPont Washington Works Site APFO and PFOA in Groundwater

• 

## Table 5.7 Local Landfill APFO and PFOA in Surface Water

• 

## Table 5.8 Local Landfill APFO and PFOA in Groundwater

• 

## Table 5.9 Letart Landfill APFO and PFOA in Surface Water

• 

## Table 5.10 Letart Landfill APFO and PFOA in Groundwater

• 

## Table 5.11 Dry Run Landfill APFO and PFOA in Surface WaterQuarterly MOU Status Report #20 Phase II Monitoring/Sampling Work Plan 

## Updated Data Tables and Figures

20QMOU 110310 

### 3 Wilmington, DE November 3, 2010 OPPT-2004-0113 PFOA Site-Related Environmental Assessment Program 

### • 

## Table 5.12 Dry Run Landfill APFO and PFOA in Groundwater

• 

## Figure 4.1 Locations of Residential GAC Systems – Ohio

• 

## Figure 4.2 Locations of Residential GAC Systems – West Virginia and Ohio

Note: Table 4.7 is no longer updated and is not included in the quarterly MOU monitoring reports. Please refer to the Quarterly MOU Monitoring Report # 13, dated February 3, 2009, for the final update of this table.

### Table 4.1 APFO and PFOA Results for Public Water Supply Sampling, West Virginia and Ohio Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Location Sample ID Sample Date A PFO (C-8) ug/ L PFOA ug/L* Comments Belpre, OH BelPSDPT 3/13/2006 0.222 0.213 Prior Carbon Treatment BelPSD-AC-Bed1N 3/13/2006 ND (<0.0023) ND (<0.0023) Bed 1 North - Lead BelPSD-AC-Bed2N 3/13/2006 ND (<0.0023) ND (<0.0023) Bed 2 North - Lag BelPSD-AC-Bed1S 3/13/2006 ND (<0.0023) ND (<0.0023) Bed 1 South - Lead BelPSD-AC-Bed2S 3/13/2006 ND (<0.0023) ND (<0.0023) Bed 2 South - Lag BelPSDPT 4/24/2006 0.247 0.237 Prior Carbon Treatment BelPSD-AC-Bed1N-Lead 4/24/2006 ND (<0.0012) ND (<0.0012) After Carbon Bed SampleBelPSD-AC-Bed1N-LeadMS/REP 4/24/2006 ND (<0.0012) ND (<0.0012) After Carbon Bed Sample-field sample

BelPSD-AC-Bed2N-Lag 4/24/2006 ND (<0.0012) ND (<0.0012) After Carbon Bed Sample BelPSD-AC-Bed1S-Lead 4/24/2006 ND (<0.0012) ND (<0.0012) After Carbon Bed Sample

BelPSD-AC-Bed2S-Lag 4/24/2006 ND (<0.0012) ND (<0.0012) After Carbon Bed Sample BelPSDPT 5/9/2006 0.286 0.275 Prior Carbon Treatment BelPSD-Bed1N-Lead 5/9/2006 ND (<0.0012) ND (<0.0012) After Carbon Bed Sample

BelPSD-Bed2N-Lag 5/9/2006 ND (<0.0012) ND (<0.0012) After Carbon Bed Sample BelPSD-Bed1S-Lead 5/9/2006 ND (<0.0012) ND (<0.0012) After Carbon Bed Sample

BelPSD-Bed2S-Lag 5/9/2006 ND (<0.0012) ND (<0.0012) After Carbon Bed Sample BelPSDPT 6/15/2006 0.193 0.185 Prior Carbon Treatment BelPSD-Bed1N-Lead 6/15/2006 NQ (<0.006) NQ (<0.006) After Carbon Bed Sample BelPSD-Bed1N-Lead 6/15/2006 (dup) NQ (<0.006) NQ (<0.006) After Carbon Bed Sample

BelPSD-Bed2N-Lag 6/15/2006 ND (<0.0012) ND (<0.0012) After Carbon Bed Sample BelPSD-Bed1S-Lead 6/15/2006 NQ (<0.006) NQ (<0.006) After Carbon Bed Sample

BelPSD-Bed2S-Lag 6/15/2006 ND (<0.0012) ND (<0.0012) After Carbon Bed Sample BelPSDPT 7/27/2006 0.205 0.197 Prior Carbon Treatment BelPSD-Bed1N-Lead 7/27/2006 0.0146 0.0140 After Carbon Bed Sample BelPSD-Bed1N-Lead 7/27/2006 (dup) 0.0143 0.0137 After Carbon Bed Sample

BelPSD-Bed2N-Lag 7/27/2006 ND (<0.0026) ND (<0.0026) After Carbon Bed Sample BelPSD-Bed1S-Lead 7/27/2006 0.0296 0.0284 After Carbon Bed Sample

BelPSD-Bed2S-Lag 7/27/2006 ND (<0.0026) ND (<0.0026) After Carbon Bed Sample BelPSDPT 8/23/2006 0.230 0.220 Prior Carbon Treatment BelPSD-Bed2N-Lead 8/23/2006 ND (<0.0026) ND (<0.0026) After Carbon Bed Sample

BelPSD-Bed1N-Lag 8/23/2006 NQ (<0.013) NQ(<0.013) After Carbon Bed Sample BelPSD-Bed1N-Lag 8/23/2006 (dup) ND (<0.013) ND (<0.013) After Carbon Bed Sample BelPSD-Bed2S-Lead 8/23/2006 NQ (<0.013) NQ (<0.013) After Carbon Bed Sample

BelPSD-Bed1S-Lag 8/23/2006 ND (<0.0026) ND (<0.0026) After Carbon Bed Sample BelPSDPT 9/19/2006 0.190 0.180 Prior Carbon Treatment BelPSD-Bed2N-Lead 9/19/2006 NQ (<0.013) NQ (<0.013) After Carbon Bed Sample

BelPSD-Bed1N-Lag 9/19/2006 ND (<0.0026) ND (<0.0026) After Carbon Bed Sample BelPSD-Bed1N-Lag 9/19/06 (dup) ND (<0.0026) ND (<0.0026) After Carbon Bed Sample BelPSD-Bed2S-Lead 9/19/2006 NQ (<0.013) NQ (<0.013) After Carbon Bed Sample

BelPSD-Bed1S-Lag 9/19/2006 ND (<0.0026) ND (<0.0026) After Carbon Bed Sample BelPSDPT 10/10/2006 0.240 0.230 Prior Carbon Treatment BelPSD-Bed2N-Lead 10/10/2006 0.010 0.010 After Carbon Bed Sample

BelPSD-Bed1N-Lag 10/10/2006 ND (<0.0018) ND (<0.0018) After Carbon Bed Sample BelPSD-Bed1N-Lag 10/10/06 (dup) ND (<0.0018) ND (<0.0018) After Carbon Bed Sample BelPSD-Bed2S-Lead 10/10/2006 NQ (<0.0090) NQ (<0.0090) After Carbon Bed Sample

BelPSD-Bed1S-Lag 10/10/2006 ND (<0.0018) ND (<0.0018) After Carbon Bed Sample BelPSDPT 11/7/2006 0.190 0.180 Prior Carbon Treatment BelPSD-Bed2N-Lead 11/7/2006 0.019 0.018 After Carbon Bed Sample

BelPSD-Bed1N-Lag 11/7/2006 ND (<0.0018) ND (<0.0018) After Carbon Bed Sample BelPSD-Bed1N-Lag 11/7/06 (dup) ND (<0.0018) ND (<0.0018) After Carbon Bed Sample BelPSD-Bed2S-Lead 11/7/2006 0.015 0.014 After Carbon Bed Sample

BelPSD-Bed1S-Lag 11/7/2006 ND (<0.0018) ND (<0.0018) After Carbon Bed Sample BelPSDPT 12/14/2006 0.180 0.170 Prior Carbon Treatment BelPSD-Bed1N-Lead 12/14/2006 ND (<0.0018) ND (<0.0018) After Carbon Bed Sample BelPSD-Bed1N-Lead 12/14/06 (dup) ND (<0.0018) ND (<0.0018) After Carbon Bed Sample

BelPSD-Bed2N-Lag 12/14/2006 ND (<0.0018) ND (<0.0018) After Carbon Bed Sample BelPSD-Bed1S-Lead 12/14/2006 ND (<0.0018) ND (<0.0018) After Carbon Bed Sample

BelP S D-Bed 2S -Lag 12/14/2006 ND (<0.0018) ND (<0.0018) After Carbon Bed Sample Active Sampling Locations



### 11/3/10 Page 1 of 48 Table 4.1

### Table 4.1 APFO and PFOA Results for Public Water Supply Sampling, West Virginia and Ohio Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Location Sample ID Sample Date A PFO (C-8) ug/ L PFOA ug/L* Comments Active Sampling Locations

BelPSDPT 1/15/2007 0.230 0.220 Prior Carbon Treatment BelPSD-Bed1N-Lead 1/15/2007 0.0082 0.0079 After Carbon Bed Sample BelPSD-Bed1N-Lead 1/15/2007 (dup) 0.0072 0.0069 After Carbon Bed Sample

BelPSD-Bed2N-Lag 1/15/2007 NQ (<0.0051) NQ (<0.0051) After Carbon Bed Sample BelPSD-Bed1S-Lead 1/15/2007 0.0062 0.0060 After Carbon Bed Sample

BelPSD-Bed2S-Lag 1/15/2007 NQ (<0.0051) NQ (<0.0051) After Carbon Bed Sample BelPSDPT 2/15/2007 0.200 0.190 Prior Carbon Treatment BelPSD-Bed1N-Lead 2/15/2007 0.027 0.026 After Carbon Bed Sample BelPSD-Bed1N-Lead 2/15/07 (dup) 0.027 0.026 After Carbon Bed Sample

BelPSD-Bed2N-Lag 2/15/2007 ND (<0.0010) ND (<0.0010) After Carbon Bed Sample BelPSD-Bed1S-Lead 2/15/2007 0.020 0.019 After Carbon Bed Sample

BelPSD-Bed2S-Lag 2/15/2007 ND (<0.0010) ND (<0.0010) After Carbon Bed Sample BelPSDPT 3/27/2007 0.210 0.200 Prior Carbon Treatment BelPSD-Bed1N-Lead 3/27/2007 0.050 0.048 After Carbon Bed Sample BelPSD-Bed1N-Lead 3/27/07 (dup) 0.048 0.046 After Carbon Bed Sample

BelPSD-Bed2N-Lag 3/27/2007 ND (<0.0010) ND (<0.0010) After Carbon Bed Sample BelPSD-Bed1S-Lead 3/27/2007 0.045 0.043 After Carbon Bed Sample

BelPSD-Bed2S-Lag 3/27/2007 ND (<0.0010) ND (<0.0010) After Carbon Bed Sample BelPSDPT 4/19/2007 0.230 0.220 Prior Carbon Treatment BelPSD-Bed1N-Lead 4/19/2007 0.055 0.053 After Carbon Bed Sample BelPSD-Bed1N-Lead 4/19/2007 (dup) 0.061 0.059 After Carbon Bed Sample

BelPSD-Bed2N-Lag 4/19/2007 ND (<0.0027) ND (<0.0027) After Carbon Bed Sample BelPSD-Bed1S-Lead 4/19/2007 0.059 0.057 After Carbon Bed Sample

BelPSD-Bed2S-Lag 4/19/2007 ND (<0.0027) ND (<0.0027) After Carbon Bed Sample BelPSDPT 5/17/2007 0.220 0.210 Prior Carbon Treatment BelPSD-Bed1N-Lead 5/17/2007 0.080 0.077 After Carbon Bed Sample BelPSD-Bed1N-Lead 5/17/07 (dup) 0.079 0.076 After Carbon Bed Sample

BelPSD-Bed2N-Lag 5/17/2007 NQ (<0.013) NQ (<0.013) After Carbon Bed Sample BelPSD-Bed1S-Lead 5/17/2007 0.081 0.078 After Carbon Bed Sample

BelPSD-Bed2S-Lag 5/17/2007 NQ (<0.013) NQ (<0.013) After Carbon Bed Sample BelPSDPT 6/22/2007 0.200 0.190 Prior Carbon Treatment BelPSD-Bed1N-Lag 6/22/2007 NQ (<0.0062) NQ (<0.0062) After Carbon Bed Sample BelPSD-Bed1N-Lag 6/22/2007 (dup) NQ (<0.0062) NQ (<0.0062) After Carbon Bed Sample BelPSD-Bed2N-Lead 6/22/2007 0.030 0.029 After Carbon Bed Sample

BelPSD-Bed1S-Lag 6/22/2007 NQ (<0.0062) NQ (<0.0062) After Carbon Bed Sample BelPSD-Bed2S-Lead 6/22/2007 0.035 0.034 After Carbon Bed Sample BelPSDPT 7/19/2007 0.190 0.180 Prior Carbon Treatment BelPSD-Bed1N-Lag 7/19/2007 ND (<0.0012) ND (<0.0012) After Carbon Bed Sample BelPSD-Bed1N-Lag 7/19/07 (dup) ND (<0.0012) ND (<0.0012) After Carbon Bed Sample BelPSD-Bed2N-Lead 7/19/2007 0.054 0.052 After Carbon Bed Sample

BelPSD-Bed1S-Lag 7/19/2007 ND (<0.0012) ND (<0.0012) After Carbon Bed Sample BelPSD-Bed2S-Lead 7/19/2007 0.051 0.049 After Carbon Bed Sample BelPSDPT 8/14/2007 0.230 0.220 Prior Carbon Treatment BelPSD-Bed1N-Lag 8/14/2007 ND (<0.0012) ND (<0.0012) After Carbon Bed Sample BelPSD-Bed1N-Lag 8/14/2007 (dup) ND (<0.0012) ND (<0.0012) After Carbon Bed Sample BelPSD-Bed2N-Lead 8/14/2007 0.075 0.072 After Carbon Bed Sample

BelPSD-Bed1S-Lag 8/14/2007 ND (<0.0012) ND (<0.0012) After Carbon Bed Sample BelPSD-Bed2S-Lead 8/14/2007 0.082 0.079 After Carbon Bed Sample BelPSDPT 9/12/2007 0.260 0.250 Prior Carbon Treatment BelPSD-Bed1N-Lag 9/12/2007 ND (<0.0012) ND (<0.0012) After Carbon Bed Sample BelPSD-Bed1N-Lag 9/12/2007 (dup) ND (<0.0012) ND (<0.0012) After Carbon Bed Sample BelPSD-Bed2N-Lead 9/12/2007 0.082 0.079 After Carbon Bed Sample

BelPSD-Bed1S-Lag 9/12/2007 ND (<0.0012) ND (<0.0012) After Carbon Bed Sample BelPSD-Bed2S-Lead 9/12/2007 0.100 0.100 After Carbon Bed Sample BelPSDPT 10/3/2007 0.230 0.220 Prior Carbon Treatment BelPSD-Bed1N-Lag 10/3/2007 ND (<0.0031) ND (<0.0031) After Carbon Bed Sample BelPSD-Bed1N-Lag 10/3/2007 (dup) 0.074 0.071 After Carbon Bed Sample BelPSD-Bed2N-Lead 10/3/2007 0.076 0.073 After Carbon Bed Sample

BelP S D-Bed 1S -Lag 10/3/2007 ND (<0.0031) ND (<0.0031) After Carbon Bed Sample



### 11/3/10 Page 2 of 48 Table 4.1

### Table 4.1 APFO and PFOA Results for Public Water Supply Sampling, West Virginia and Ohio Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Location Sample ID Sample Date A PFO (C-8) ug/ L PFOA ug/L* Comments Active Sampling Locations

BelPSD-Bed2S-Lead 10/3/2007 0.100 0.097 After Carbon Bed Sample BelPSDPT 11/13/2007 0.230 0.220 Prior Carbon Treatment BelPSD-Bed1N-Lag 11/13/2007 NQ (<0.016) NQ (<0.016) After Carbon Bed Sample BelPSD-Bed1N-Lag 11/13/07 (dup) NQ (<0.016) NQ (<0.016) After Carbon Bed Sample BelPSD-Bed2N-Lead 11/13/2007 0.100 0.100 After Carbon Bed Sample

BelPSD-Bed1S-Lag 11/13/2007 NQ (<0.016) NQ (<0.016) After Carbon Bed Sample BelPSD-Bed2S-Lead 11/13/2007 0.110 0.110 After Carbon Bed Sample BelPSDPT 12/11/2007 0.230 0.220 Prior Carbon Treatment BelPSD-Bed1N-Lead 12/11/2007 ND (<0.0031) ND (<0.0031) After Carbon Bed Sample BelPSD-Bed1N-Lead 12/11/2007 (dup) ND (<0.0031) ND (<0.0031) After Carbon Bed Sample

BelPSD-Bed2N-Lag 12/11/2007 ND (<0.0031) ND (<0.0031) After Carbon Bed Sample BelPSD-Bed1S-Lead 12/11/2007 NQ (<0.016) NQ (<0.016) After Carbon Bed Sample

BelPSD-Bed2S-Lag 12/11/2007 ND (<0.0031) ND (<0.0031) After Carbon Bed Sample BelPSDPT 1/16/2008 0.230 0.220 Prior Carbon Treatment BelPSD-Bed1N-Lead 1/16/2008 ND (<0.0022) ND (<0.0022) After Carbon Bed Sample BelPSD-Bed1N-Lead 1/16/2008 (dup) ND (<0.0022) ND (<0.0022) After Carbon Bed Sample

BelPSD-Bed2N-Lag 1/16/2008 ND (<0.0022) ND (<0.0022) After Carbon Bed Sample BelPSD-Bed1S-Lead 1/16/2008 0.037 0.036 After Carbon Bed Sample

BelPSD-Bed2S-Lag 1/16/2008 ND (<0.0022) ND (<0.0022) After Carbon Bed Sample BelPSDPT 2/12/2008 0.240 0.230 Prior Carbon Treatment BelPSD-Bed1N-Lead 2/12/2008 ND (<0.0022) ND (<0.0022) After Carbon Bed Sample BelPSD-Bed1N-Lead 2/12/08 (dup) ND (<0.0022) ND (<0.0022) After Carbon Bed Sample

BelPSD-Bed2N-Lag 2/12/2008 NQ (<0.011) NQ (<0.011) After Carbon Bed Sample BelPSD-Bed1S-Lead 2/12/2008 0.048 0.046 After Carbon Bed Sample

BelPSD-Bed2S-Lag 2/12/2008 ND (<0.0022) ND (<0.0022) After Carbon Bed Sample BelPSDPT 3/12/2008 0.220 0.210 Prior Carbon Treatment BelPSD-Bed1N-Lead 3/12/2008 ND (<0.0022) ND (<0.0022) After Carbon Bed Sample BelPSD-Bed1N-Lead 3/12/08 (dup) ND (<0.0022) ND (<0.0022) After Carbon Bed Sample

BelPSD-Bed2N-Lag 3/12/2008 0.019 0.018 After Carbon Bed Sample BelPSD-Bed1S-Lead 3/12/2008 0.062 0.059 After Carbon Bed Sample

BelPSD-Bed2S-Lag 3/12/2008 ND (<0.0022) ND (<0.0022) After Carbon Bed Sample BelPSDPT 4/3/2008 0.190 0.180 Prior Carbon Treatment BelPSD-Bed1N-Lead 4/3/2008 NQ (<0.0096) NQ (<0.0096) After Carbon Bed Sample BelPSD-Bed1N-Lead 4/3/2008 (dup) ND (<0.0019) ND (<0.0019) After Carbon Bed Sample

BelPSD-Bed2N-Lag 4/3/2008 0.032 0.031 After Carbon Bed Sample BelPSD-Bed1S-Lead 4/3/2008 0.069 0.066 After Carbon Bed Sample

BelPSD-Bed2S-Lag 4/3/2008 ND (<0.0019) ND (<0.0019) After Carbon Bed Sample BelPSDPT 4/18/2008 0.230 0.220 Prior Carbon Treatment BelPSD-Bed1N-Lead 4/18/2008 0.034 0.033 After Carbon Bed Sample

BelPSD-Bed2N-Lag 4/18/2008 0.018 0.017 After Carbon Bed Sample BelPSD-CombinedEFF 4/18/2008 0.019 0.018 Combined Effluent BelPSDPT 5/27/2008 0.190 0.180 Prior Carbon Treatment BelPSD-Bed1N-Lag 5/27/2008 ND (<0.0019) ND (<0.0019) After Carbon Bed Sample BelPSD-Bed1N-Lag 5/27/2008 (dup) ND (<0.0019) ND (<0.0019) After Carbon Bed Sample BelPSD-Bed2N-Lead 5/27/2008 ND (<0.0019) ND (<0.0019) After Carbon Bed Sample

BelPSD-Bed1S-Lag 5/27/2008 ND (<0.0019) ND (<0.0019) After Carbon Bed Sample BelPSD-Bed2S-Lead 5/27/2008 NQ (<0.0096) NQ (<0.0096) After Carbon Bed Sample BelPSDPT 6/13/2008 0.190 0.180 Prior Carbon Treatment BelPSD-Bed1N-Lag 6/13/2008 ND (<0.0019) ND (<0.0019) After Carbon Bed Sample BelPSD-Bed1N-Lag 6/13/2008 (dup) ND (<0.0019) ND (<0.0019) After Carbon Bed Sample BelPSD-Bed2N-Lead 6/13/2008 ND (<0.0019) ND (<0.0019) After Carbon Bed Sample

BelPSD-Bed1S-Lag 6/13/2008 ND (<0.0019) ND (<0.0019) After Carbon Bed Sample BelPSD-Bed2S-Lead 6/13/2008 0.023 0.022 After Carbon Bed Sample BelPSDPT 7/16/2008 0.190 0.180 Prior Carbon Treatment BelPSD-Bed1N-Lag 7/16/2008 ND (<0.0023) ND (<0.0023) After Carbon Bed Sample BelPSD-Bed1N-Lag 7/16/2008 (dup) ND (<0.0023) ND (<0.0023) After Carbon Bed Sample BelPSD-Bed2N-Lead 7/16/2008 ND (<0.0023) ND (<0.0023) After Carbon Bed Sample

BelPSD-Bed1S-Lag 7/16/2008 ND (<0.0023) ND (<0.0023) After Carbon Bed Sample BelP S D-Bed 2S -Lead 7/16/2008 0.050 0.048 After Carbon Bed Sample



### 11/3/10 Page 3 of 48 Table 4.1

### Table 4.1 APFO and PFOA Results for Public Water Supply Sampling, West Virginia and Ohio Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Location Sample ID Sample Date A PFO (C-8) ug/ L PFOA ug/L* Comments Active Sampling Locations

BelPSDPT 8/11/2008 0.160 0.150 Prior Carbon Treatment BelPSD-Bed1N-Lag 8/11/2008 ND (<0.0023) ND (<0.0023) After Carbon Bed Sample BelPSD-Bed1N-Lag 8/11/2008 (dup) ND (<0.0023) ND (<0.0023) After Carbon Bed Sample BelPSD-Bed2N-Lead 8/11/2008 ND (<0.0023) ND (<0.0023) After Carbon Bed Sample

BelPSD-Bed1S-Lag 8/11/2008 ND (<0.0023) ND (<0.0023) After Carbon Bed Sample BelPSD-Bed2S-Lead 8/11/2008 0.053 0.051 After Carbon Bed Sample BelPSDPT 9/10/2008 0.24 0.23 Prior to Treatment Sample BelPSD-Bed1N-Lag 9/10/2008 ND(<0.0023 ) ND(<0.0023 ) After Carbon Bed Sample BelPSD-Bed1N-Lag 9/10/2008 (dup) ND(<0.0023 ) ND(<0.0023 ) After Carbon Bed Sample BelPSD-Bed2N-Lead 9/10/2008 0.015 0.014 After Carbon Bed Sample

BelPSD-Bed1S-Lag 9/10/2008 ND(<0.0023 ) ND(<0.0023 ) After Carbon Bed Sample BelPSD-Bed2S-Lead 9/10/2008 0.065 0.062 After Carbon Bed Sample BelPSDPT 10/20/2008 0.180 0.170 Prior to Treatment Sample BelPSD-Bed1N-Lag 10/20/2008 ND (<0.0017) ND (<0.0017) After Carbon Bed Sample BelPSD-Bed1N-Lag 10/20/08 (dup) ND (<0.0017) ND (<0.0017) After Carbon Bed Sample BelPSD-Bed2N-Lead 10/20/2008 0.034 0.033 After Carbon Bed Sample

BelPSD-Bed1S-Lag 10/20/2008 ND (<0.0017) ND (<0.0017) After Carbon Bed Sample BelPSD-Bed2S-Lead 10/20/2008 0.073 0.070 After Carbon Bed Sample BelPSDPT 11/21/2008 0.200 0.190 Prior to Treatment Sample BelPSD-Bed1N-Lag 11/21/2008 ND (<0.0017) ND (<0.0017) After Carbon Bed Sample BelPSD-Bed1N-Lag 11/21/08 (dup) ND (<0.0017) ND (<0.0017) After Carbon Bed Sample BelPSD-Bed2N-Lead 11/21/2008 0.046 0.044 After Carbon Bed Sample

BelPSD-Bed1S-Lag 11/21/2008 ND (<0.0017) ND (<0.0017) After Carbon Bed Sample BelPSD-Bed2S-Lead 11/21/2008 0.069 0.066 After Carbon Bed Sample BelPSDPT 12/16/2008 0.230 0.220 Prior to Treatment Sample BelPSD-Bed1N-Lag 12/16/2008 ND (<0.0017) ND (<0.0017) After Carbon Bed Sample BelPSD-Bed1N-Lag 12/16/08 (dup) ND (<0.0017) ND (<0.0017) After Carbon Bed Sample BelPSD-Bed2N-Lead 12/16/2008 0.049 0.047 After Carbon Bed Sample

BelPSD-Bed1S-Lag 12/16/2008 ND (<0.0017) ND (<0.0017) After Carbon Bed Sample BelPSD-Bed2S-Lead 12/16/2008 0.083 0.080 After Carbon Bed Sample BelPSDPT 1/22/2009 0.240 0.230 Prior to Treatment Sample BelPSD-Bed1N-Lag 1/22/2009 NQ (<0.013) NQ (<0.013) After Carbon Bed Sample BelPSD-Bed1N-Lag 1/22/2009 (dup) NQ (<0.013) NQ (<0.013) After Carbon Bed Sample BelPSD-Bed2N-Lead 1/22/2009 0.094 0.090 After Carbon Bed Sample

BelPSD-Bed1S-Lag 1/22/2009 ND (<0.0026) ND (<0.0026) After Carbon Bed Sample BelPSD-Bed2S-Lead 1/22/2009 0.100 0.098 After Carbon Bed Sample BelPSDPT 2/26/2009 0.220 0.210 Prior to Treatment Sample BelPSD-Bed1N-Lead 2/26/2009 0.018 0.017 After Carbon Bed Sample BelPSD-Bed1N-Lead 2/26/2009 (dup) 0.020 0.019 After Carbon Bed Sample

BelPSD-Bed2N-Lag 2/26/2009 ND (<0.0026) ND (<0.0026) After Carbon Bed Sample BelPSD-Bed1S-Lead 2/26/2009 ND (<0.0026) ND (<0.0026) After Carbon Bed Sample

BelPSD-Bed2S-Lag 2/26/2009 ND (<0.0026) ND (<0.0026) After Carbon Bed Sample BelPSD-PT 3/26/2009 0.26 0.25 Prior to Treatment Sample BelPSD-Bed1N-Lead-2 3/26/2009 (dup) 0.031 0.03 After Carbon Bed Sample-Dup

BelPSD-Bed1N-Lead 3/26/2009 0.027 0.026 After Carbon Bed Sample

BelPSD-Bed2N-Lag 3/26/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Bed Sample BelPSD-Bed1S-Lead 3/26/2009 0.025 0.024 After Carbon Bed Sample

BelPSD-Bed2S-Lag 3/26/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Bed Sample BelPSD-PT 4/23/2009 0.27 0.26 Prior to Treatment Sample BelPSD-Bed1N-Lead-2 4/23/2009 (dup) 0.034 0.033 After Carbon Bed Sample-Dup

BelPSD-Bed1N-Lead 4/23/2009 0.034 0.033 After Carbon Bed Sample

BelPSD-Bed2N-Lag 4/23/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Bed Sample BelPSD-Bed1S-Lead 4/23/2009 0.034 0.033 After Carbon Bed Sample

BelPSD-Bed2S-Lag 4/23/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Bed Sample BelPSD-PT 5/14/2009 0.27 0.26 Prior to Treatment Sample BelPSD-Bed1N-Lead 5/14/2009 0.055 0.053 After Carbon Bed Sample BelPSD-Bed1N-Lead-2 5/14/2009 (dup) 0.044 0.042 After Carbon Bed Sample-Dup BelPSD-Bed2N-Lag 5/14/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Bed Sample BelP S D-Bed 1S -Lead 5/14/2009 0.048 0.046 A f ter C arbon Bed S ample



### 11/3/10 Page 4 of 48 Table 4.1

### Table 4.1 APFO and PFOA Results for Public Water Supply Sampling, West Virginia and Ohio Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Location Sample ID Sample Date A PFO (C-8) ug/ L PFOA ug/L* Comments Active Sampling Locations

BelPSD-Bed2S-Lag 5/14/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Bed Sample BelPSD-PT 6/25/2009 0.31 0.3 Prior to Treatment Sample BelPSD-Bed1N-Lead 6/25/2009 0.087 0.084 After Carbon Bed Sample BelPSD-Bed1N-Lead-2 6/25/2009 (dup) 0.084 0.081 After Carbon Bed Sample-Dup BelPSD-Bed2N-Lag 6/25/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Bed Sample BelPSD-Bed1S-Lead 6/25/2009 0.083 0.08 After Carbon Bed Sample

BelPSD-Bed2S-Lag 6/25/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Bed Sample BelPSD-PT 7/23/2009 0.26 0.25 Prior to Treatment Sample BelPSD-Bed1N-Lead 7/23/2009 0.099 0.097 After Carbon Bed Sample BelPSD-Bed1N-Lead-2 7/23/2009 (dup) 0.11 0.11 After Carbon Bed Sample-Dup BelPSD-Bed2N-Lag 7/23/2009 NQ (<0.013) NQ (<0.013) After Carbon Bed Sample BelPSD-Bed1S-Lead 7/23/2009 0.086 0.083 After Carbon Bed Sample

BelPSD-Bed2S-Lag 7/23/2009 0.016 0.015 After Carbon Bed Sample BelPSD-PT 8/21/2009 0.29 0.28 Prior to Treatment Sample BelPSD-Bed1N-Lead 8/21/2009 0.11 0.11 After Carbon Bed Sample BelPSD-Bed1N-Lead-2 8/21/2009 (dup) 0.092 0.088 After Carbon Bed Sample-Dup BelPSD-Bed2N-Lag 8/21/2009 0.015 0.014 After Carbon Bed Sample BelPSD-Bed1S-Lead 8/21/2009 0.12 0.12 After Carbon Bed Sample

BelPSD-Bed2S-Lag 8/21/2009 0.024 0.023 After Carbon Bed Sample BelPSD-PT 9/23/2009 0.28 0.27 Prior to Treatment Sample BelPSD-Bed1N-Lag 9/23/2009 ND(<0.0033 ) ND(<0.0033 ) After Carbon Bed Sample BelPSD-Bed1N-Lag-2 9/23/2009 (dup) ND(<0.0033 ) ND(<0.0033 ) After Carbon Bed Sample-Dup BelPSD-Bed2N-Lead 9/23/2009 0.056 0.054 After Carbon Bed Sample

BelPSD-Bed1S-Lag 9/23/2009 ND(<0.0033 ) ND(<0.0033 ) After Carbon Bed Sample BelPSD-Bed2S-Lead 9/23/2009 0.077 0.074 After Carbon Bed Sample BelPSD-PT 10/27/2009 0.27 0.26 Prior to Treatment Sample BelPSD-Bed1N-Lag 10/27/2009 ND(<0.0033 ) ND(<0.0033 ) After Carbon Bed Sample BelPSD-Bed1N-Lag-2 10/27/2009 (dup) ND(<0.0033 ) ND(<0.0033 ) After Carbon Bed Sample-Dup BelPSD-Bed2N-Lead 10/27/2009 0.087 0.084 After Carbon Bed Sample

BelPSD-Bed1S-Lag 10/27/2009 ND(<0.0033 ) ND(<0.0033 ) After Carbon Bed Sample BelPSD-Bed2S-Lead 10/27/2009 0.097 0.093 After Carbon Bed Sample BelPSD-PT 11/19/2009 0.24 0.23 Prior to Treatment Sample BelPSD-Bed1N-Lag 11/19/2009 ND(<0.0033 ) ND(<0.0033 ) After Carbon Bed Sample BelPSD-Bed1N-Lag-2 11/19/2009 (dup) ND(<0.0033 ) ND(<0.0033 ) After Carbon Bed Sample-Dup BelPSD-Bed2N-Lead 11/19/2009 0.1 0.1 After Carbon Bed Sample

BelPSD-Bed1S-Lag 11/19/2009 ND(<0.0033 ) ND(<0.0033 ) After Carbon Bed Sample BelPSD-Bed2S-Lead 11/19/2009 0.11 0.11 After Carbon Bed Sample BelPSD-PT 12/15/2009 0.23 0.22 Prior to Treatment Sample BelPSD-Bed1N-Lag 12/15/2009 ND(<0.0033 ) ND(<0.0033 ) After Carbon Bed Sample BelPSD-Bed1N-Lag-2 12/15/2009 (dup) ND(<0.0033 ) ND(<0.0033 ) After Carbon Bed Sample-Dup BelPSD-Bed2N-Lead 12/15/2009 0.1 0.097 After Carbon Bed Sample

BelPSD-Bed1S-Lag 12/15/2009 ND(<0.0033 ) ND(<0.0033 ) After Carbon Bed Sample BelPSD-Bed2S-Lead 12/15/2009 0.11 0.11 After Carbon Bed Sample BELPSD-PT 1/22/2010 0.26 0.25 Prior to Treatment Sample BELPSD-BED2N-LEAD 1/22/2010 0.12 0.12 After Carbon Bed Sample

BELPSD-BED1N-LAG 1/22/2010 NQ (<0.018) NQ (<0.018) After Carbon Bed Sample BELPSD-BED1N-LAG-2 1/22/2010 NQ (<0.018) NQ (<0.018) After Carbon Bed Sample-Dup BELPSD-BED2S-LEAD 1/22/2010 0.11 0.11 After Carbon Bed Sample

BELPSD-BED1S-LAG 1/22/2010 ND(<0.0035 ) ND(<0.0035 ) After Carbon Bed Sample BELPSD-PT 2/26/2010 0.28 0.27 Prior to Treatment Sample BELPSD-BED1N-LEAD-2 2/26/2010 0.026 0.025 After Carbon Bed Sample-Dup

BELPSD-BED1N-LEAD 2/26/2010 0.024 0.023 After Carbon Bed Sample

BELPSD-BED2N-LAG 2/26/2010 ND(<0.0035 ) ND(<0.0035 ) After Carbon Bed Sample BELPSD-BED1S-LEAD 2/26/2010 0.019 0.018 After Carbon Bed Sample

BELPSD-BED2S-LAG 2/26/2010 ND(<0.0035 ) ND(<0.0035 ) After Carbon Bed Sample BELPSD-PT 3/23/2010 0.25 0.24 Prior to Treatment Sample BELPSD-BED1N-LEAD-2 3/23/2010 0.037 0.036 After Carbon Bed Sample-Dup

BELPSD-BED1N-LEAD 3/23/2010 0.041 0.04 After Carbon Bed Sample

BELP S D-BED 2 N-LA G 3/23/2010 ND(<0.0035 ) ND(<0.0035 ) A f ter C arbon Bed S ample



### 11/3/10 Page 5 of 48 Table 4.1

### Table 4.1 APFO and PFOA Results for Public Water Supply Sampling, West Virginia and Ohio Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Location Sample ID Sample Date A PFO (C-8) ug/ L PFOA ug/L* Comments Active Sampling Locations

BELPSD-BED1S-LEAD 3/23/2010 0.035 0.034 After Carbon Bed Sample

BELPSD-BED2S-LAG 3/23/2010 ND(<0.0035 ) ND(<0.0035 ) After Carbon Bed Sample BELPSD-PT 4/28/2010 0.3 0.29 Prior to Treatment Sample BELPSD-BED1N-LEAD-2 4/28/2010 0.054 0.052 After Carbon Bed Sample-Dup

BELPSD-BED1N-LEAD 4/28/2010 0.058 0.056 After Carbon Bed Sample

BELPSD-BED2N-LAG 4/28/2010 ND(<0.0038 ) ND(<0.0038 ) After Carbon Bed Sample BELPSD-BED1S-LEAD 4/28/2010 0.052 0.05 After Carbon Bed Sample

BELPSD-BED2S-LAG 4/28/2010 ND(<0.0038 ) ND(<0.0038 ) After Carbon Bed Sample BELPSD-PT 5/19/2010 0.25 0.24 Prior to Treatment Sample BELPSD-BED1N-LEAD-2 5/19/2010 0.052 0.05 After Carbon Bed Sample-Dup

BELPSD-BED1N-LEAD 5/19/2010 0.044 0.042 After Carbon Bed Sample

BELPSD-BED2N-LAG 5/19/2010 ND(<0.0038 ) ND(<0.0038 ) After Carbon Bed Sample BELPSD-BED1S-LEAD 5/19/2010 0.048 0.046 After Carbon Bed Sample

BELPSD-BED2S-LAG 5/19/2010 ND(<0.0038 ) ND(<0.0038 ) After Carbon Bed Sample BELPSD-PT 6/24/2010 0.29 0.28 Prior to Treatment Sample BELPSD-BED1N-LEAD-2 6/24/2010 0.058 0.056 After Carbon Bed Sample-Dup

BELPSD-BED1N-LEAD 6/24/2010 0.071 0.068 After Carbon Bed Sample

BELPSD-BED2N-LAG 6/24/2010 ND(<0.0038 ) ND(<0.0038 ) After Carbon Bed Sample BELPSD-BED1S-LEAD 6/24/2010 0.075 0.072 After Carbon Bed Sample

BELPSD-BED2S-LAG 6/24/2010 ND(<0.0038 ) ND(<0.0038 ) After Carbon Bed Sample BELPSD-PT 7/22/2010 0.31 0.3 Prior to Treatment Sample BELPSD-BED1N-LEAD 7/22/2010 0.09 0.086 After Carbon Bed Sample BELPSD-BED1N-LEAD-2 7/22/2010 0.076 0.073 After Carbon Bed Sample-Dup BELPSD-BED2N-LAG 7/22/2010 NQ (<0.012) NQ (<0.012) After Carbon Bed Sample BELPSD-BED1S-LEAD 7/22/2010 0.1 0.096 After Carbon Bed Sample

BELPSD-BED2S-LAG 7/22/2010 NQ (<0.012) NQ (<0.012) After Carbon Bed Sample BELPSD-PT 8/30/2010 0.23 0.22 Prior to Treatment Sample BELPSD-BED2N-LEAD 8/30/2010 0.017 0.016 After Carbon Bed Sample BELPSD-BED1N-LAG-2 8/30/2010 ND(<0.0025 ) ND(<0.0025 ) After Carbon Bed Sample-Dup

BELPSD-BED1N-LAG 8/30/2010 ND(<0.0025 ) ND(<0.0025 ) After Carbon Bed Sample BELPSD-BED2S-LEAD 8/30/2010 0.017 0.016 After Carbon Bed Sample

BELPSD-BED1S-LAG 8/30/2010 ND(<0.0025 ) ND(<0.0025 ) After Carbon Bed Sample WQConformation 3/3/2006 ND (<0.0023) ND (<0.0023) After Carbon Bed Sample

Hydro H2O-Bel 1/27/2006 0.213 0.204 NPDES Discharge Monitoring BEL-Backwash 9/3/2009 NQ (<0.013) NQ (<0.013) NPDES Discharge Monitoring BEL-Backwash1 2/9/2006 0.019 0.018 NPDES Discharge Monitoring BEL-Backwash1 8/18/2006 ND (<0.013) ND (<0.013) NPDES Discharge Monitoring BEL-Backwash1 8/18/06 (dup) ND (<0.013) ND (<0.013) NPDES Discharge Monitoring BEL-Backwash1 11/30/2006 ND (<0.0018) ND (<0.0018) NPDES Discharge Monitoring BEL-Backwash1 6/20/2007 ND (<0.0012) ND (<0.0012) NPDES Discharge Monitoring BEL-Backwash1 12/7/2007 ND (<0.0031) ND (<0.0031) NPDES Discharge Monitoring BEL-Backwash1 5/16/2008 ND (<0.0019) ND (<0.0019) NPDES Discharge Monitoring BEL-Backwash1 2/26/2009 ND (<0.0026) ND (<0.0026) NPDES Discharge Monitoring BEL-Backwash2 2/10/2006 0.014 0.014 NPDES Discharge Monitoring BEL-Backwash2 8/19/2006 ND (<0.013) ND (<0.013) NPDES Discharge Monitoring BEL-Backwash2 11/30/2006 ND (<0.0018) ND (<0.0018) NPDES Discharge Monitoring BEL-Backwash2 11/30/06 (dup) ND (<0.0018) ND (<0.0018) NPDES Discharge Monitoring BEL-Backwash2 6/20/2007 NQ (<0.0062) NQ (<0.0062) NPDES Discharge Monitoring BEL-Backwash2 12/7/2007 ND (<0.0031) ND (<0.0031) NPDES Discharge Monitoring BEL-Backwash2 5/16/2008 NQ (<0.0096) NQ (<0.0096) NPDES Discharge Monitoring BEL-Backwash2 2/26/2009 NQ (<0.0026) NQ (<0.0026) NPDES Discharge Monitoring BEL-Backwash3 5/16/2008 ND (<0.0019) ND (<0.0019) NPDES Discharge Monitoring BEL-BACKWASH 9/3/2009 NQ (<0.013) NQ (<0.013) NPDES Discharge Monitoring BEL-BACKWASH 2/26/2010 ND(<0.0035 ) ND(<0.0035 ) NPDES Discharge Monitoring BEL-BACKWASH 8/27/2010 ND(<0.0025 ) ND(<0.0025 ) NPDES Discharge Monitoring C-Stall-Belp 2/3/2006 0.109 0.105 NPDES Discharge Monitoring C-Stall-Belp 8/17/2006 0.076 0.073 NPDES Discharge Monitoring C-Stall-Belp 2/25/2009 0.08 0.077 NPDES Discharge Monitoring

BelP S DPT 3/10/2005 0.144 0.138 Prior Carbon Treatment



### 11/3/10 Page 6 of 48 Table 4.1

### Table 4.1 APFO and PFOA Results for Public Water Supply Sampling, West Virginia and Ohio Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Location Sample ID Sample Date A PFO (C-8) ug/ L PFOA ug/L* Comments Active Sampling Locations

BelPSDPT 3/13/2006 0.222 0.213 Prior Carbon Treatment BELPSDAT 2/7/2002 0.082 After Treatment Sample BELPSDAT 3/25/2002 0.113 After Treatment Sample BELPSDAT 4/23/2002 0.120 After Treatment Sample BELPSDAT 7/13/2005 0.223 0.214 After Treatment Sample BELPSDAT 7/13/05 (dup) 0.235 0.226 After Treatment Sample BELPSDPW1 2/7/2002 0.100 Production Well BELPSDPW1 3/25/2002 0.130 Production Well BELPSDPW1 7/13/2005 0.205 0.197 Production Well BELPSDPW1 9/22/2006 0.250 0.240 Production Well BELPSDPW1 9/12/2007 0.180 0.170 Production Well BELPSDPW1 9/24/2008 0.210 0.200 Production Well BELPSDPW1 10/27/2009 0.22 0.21 Production Well BELPSDPW2 2/7/2002 NQ (<0.050) Production Well BELPSDPW2 2/7/2002 (dup) NQ (<0.050) duplicate BELPSDPW2 3/25/2002 NQ (<0.050) Production Well BELPSDPW2 7/13/2005 0.176 0.169 Production Well BELPSDPW2 9/22/2006 0.170 0.160 Production Well BELPSDPW2 9/12/2007 0.220 0.210 Production Well BELPSDPW2 9/24/2008 0.210 0.200 Production Well BELPSDPW2 10/27/2009 0.077 0.074 Production Well BELPSDPW3 3/25/2002 0.141 Production Well BELPSDPW3 4/23/2002 0.120 Production Well BELPSDPW3 7/13/2005 0.227 0.218 Production Well BELPSDPW3 9/22/2006 no sample port no sample port Production Well BELPSDPW4 2/7/2002 0.101 Production Well BELPSDPW4 3/25/2002 0.133 Production Well BELPSDPW4 4/23/2002 0.114 Production Well BELPSDPW4 7/13/2005 0.248 0.238 Production Well BELPSDPW4 9/22/2006 0.200 0.190 Production Well BELPSDPW4 9/12/2007 0.260 0.250 Production Well BELPSDPW4 9/24/2008 0.200 0.190 Production Well BELPSDPW4 10/27/2009 0.27 0.26 Production Well BELPSDPW5 2/7/2002 0.107 Production Well BELPSDPW5 3/25/2002 0.103 Production Well BELPSDPW5 4/23/2002 0.107 Production Well BELPSDPW5 4/23/2002 (dup) 0.111 duplicate BELPSDPW5 7/13/2005 0.232 0.223 Production Well BELPSDPW5 9/22/2006 0.210 0.200 Production Well BELPSDPW5 9/22/06 (dup) 0.210 0.200 duplicate BELPSDPW5 9/12/2007 0.220 0.210 Production Well BELPSDPW5 9/12/07 (dup) 0.240 0.230 duplicate BELPSDPW5 9/24/2008 0.230 0.220 Production Well BELPSDPW5 9/24/08 (dup) 0.240 0.230 duplicate BELPSDPW5 10/27/2009 0.27 0.26 Production Well BELPSDPW5 10/27/2009 (dup) 0.3 0.29 duplicate Blennerhassett Island, WV BLENI TW0 2/21/2002 ND (<0.010) Test well BLENI TW7 2/21/2002 NQ (<0.050) Test well BLENI W19A 2/21/2002 0.316 Test well BLENISLEPS1 1/30/2002 0.165 System 1/Well A - wellhouse spigot^ BLENISLEPS1 9/16/2004 0.497 System 2/Well B****^^ BLENISLEPS1 7/14/2005 0.034 0.033 System 1/Well A - wellhouse spigot^ Winter Well-BHI 4/7/2006 0.611 0.587 System 1/Well A - wellhouse spigot^ Summer Well-Raw-BHI 4/7/2006 0.060 0.058 System 2/Well B^^

Summer Well-AT-BHI 4/7/2006 0.048 0.046 System 2/Well B - after treatment^^ Little Hocking, OH LHPSD1 12/20/2001 1.820 Production Well LHPSD1 1/21/2002 1.720 Production Well LHPSD1 2/22/2002 2.370 Production Well LHP S D 1 3/26/2002 2.990 Production Well



### 11/3/10 Page 7 of 48 Table 4.1

### Table 4.1 APFO and PFOA Results for Public Water Supply Sampling, West Virginia and Ohio Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Location Sample ID Sample Date A PFO (C-8) ug/ L PFOA ug/L* Comments Active Sampling Locations

LHPSD1 4/23/2002 2.020 Production Well LHPSD1 8/21/2002 3.650 Production Well LHPSD1 10/16/2002 3.410 Production Well LHPSD1 2/26/2003 3.380 Production Well LHPSD1 5/28/2003 3.340 Production Well LHPSD1 8/29/2003 3.600 Production Well LHPSD1 12/17/2003 1.680 Production Well LHPSD1 12/17/2003 (dup) 1.600 duplicate LHPSD1 2/24/2004 5.22 Production Well LHPSD1 2/24/2004 (dup) 5.39 duplicate LHPSD1 5/28/2004 4.38 Production Well LHPSD1 5/28/2004 (dup) 4.38 duplicate LHPSD1 9/16/2004 7.53 Production Well LHPSD1 11/29/2004 9.03 8.68 Production Well LHPSD1 1/21/2005 4.39 4.22 Production Well LHPSD1 5/18/2005 5.88 5.65 Production Well LHPSD1 7/13/2005 4.63 4.45 Production Well LHPSD1 10/13/2005 7.07 6.79 Production Well LHPSD1 2/10/2006 3.91 3.76 Production Well LHPSD1 5/17/2006 5.18 4.98 Production Well LHPSD1 11/28/2007 3.4 3.3 Production Well LHPSD1 3/19/2008 4.7 4.5 Production Well LHPSD1 6/13/2008 3.3 3.2 Production Well LHPSD1 9/5/2008 3.4 3.3 Production Well LHPSD1 12/15/2008 5.9 5.7 Production Well LHPSD1 3/20/2009 5.3 5.1 Production Well LHPSD1 5/29/2009 4.8 4.6 Production Well LHPSD1 9/4/2009 5.1 4.9 Production Well LHPSD1 3/5/2010 5.5 5.3 Production Well LHPSD1 6/11/2010 5.2 5 Production Well LHPSD1 9/7/2010 4.4 4.2 Production Well LHPSD2 12/20/2001 4.3 4.1 Production Well LHPSD2 12/20/2001 (dup) 5.5 5.3 Production Well LHPSD2 12/20/2001 3.720 Production Well LHPSD2 12/20/2001 (dup) 3.520 duplicate LHP S D 2 1/21/2002 2.970 Production Well LHPSD2 2/22/2002 2.030 Production Well LHPSD2 2/22/2002 (dup) 2.070 duplicate LHPSD2 3/26/2002 3.310 Production Well LHPSD2 4/23/2002 3.400 Production Well LHPSD2 8/21/2002 4.260 Production Well LHPSD2 10/16/2002 3.980 Production Well LHPSD2 2/26/2003 3.620 Production Well LHPSD2 5/28/2003 4.310 Production Well LHPSD2 8/29/2003 4.390 Production Well LHPSD2 12/17/2003 2.630 Production Well LHPSD2 2/24/2004 5.48 Production Well LHPSD2 5/28/2004 5.07 Production Well LHPSD2 9/16/2004 6.84 Production Well LHPSD2 11/29/2004 9.89 9.5 Production Well LHPSD2 1/21/2005 4.78 4.59 Production Well LHPSD2 5/18/2005 7.28 6.99 Production Well LHPSD2 7/13/2005 5.74 5.51 Production Well LHPSD2 10/13/2005 7.55 7.25 Production Well LHPSD2 2/10/2006 5.07 4.87 Production Well LHPSD2 5/17/2006 6.42 6.17 Production Well LHPSD2 11/28/2007 4 3.8 Production Well LHPSD2 3/19/2008 2.5 2.4 Production Well LHP S D 2 6/13/2008 2.1 2 Production Well



### 11/3/10 Page 8 of 48 Table 4.1

### Table 4.1 APFO and PFOA Results for Public Water Supply Sampling, West Virginia and Ohio Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Location Sample ID Sample Date A PFO (C-8) ug/ L PFOA ug/L* Comments Active Sampling Locations

LHPSD2 9/5/2008 3.3 3.2 Production Well LHPSD2 12/15/2008 4.6 4.4 Production Well LHPSD2 3/20/2009 4.4 4.2 Production Well LHPSD2 5/29/2009 4.5 4.3 Production Well LHPSD2 9/4/2009 5.2 5 Production Well LHPSD2 12/11/2009 4.5 4.3 Production Well LHPSD2 3/5/2010 4.7 4.5 Production Well LHPSD2 6/11/2010 4.1 3.9 Production Well LHPSD2 9/7/2010 5.5 5.3 Production Well LHPSD3 12/20/2001 0.844 Production Well LHPSD3 1/21/2002 0.744 Production Well LHPSD3 2/22/2002 0.420 Production Well LHPSD3 3/26/2002 0.827 Production Well LHPSD3 4/23/2002 0.783 Production Well LHPSD3 8/21/2002 0.952 Production Well LHPSD3 10/16/2002 0.495 Production Well LHPSD3 10/16/2002 (dup) 0.434 duplicate LHPSD3 2/26/2003 0.733 Production Well LHPSD3 5/28/2003 0.921 Production Well LHPSD3 8/29/2003 1.220 Production Well LHPSD3 12/17/2003 0.772 Production Well LHPSD3 2/24/2004 1.87 Production Well LHPSD3 5/28/2004 2.16 Production Well LHPSD3 9/16/2004 2.92 Production Well LHPSD3 11/29/2004 3.9 3.75 Production Well LHPSD3 1/21/2005 1.78 1.71 Production Well LHPSD3 5/18/2005 2.59 2.49 Production Well LHPSD3 7/13/2005 1.82 1.75 Production Well LHP S D 3 10/13/2005 1.85 1.78 Production Well LHPSD3 2/10/2006 1.08 1.04 Production Well LHPSD3 2/10/06 (dup) 1.07 1.03 duplicate LHPSD3 5/17/2006 1.26 1.21 Production Well LHPSD3 11/28/2007 0.61 0.59 Production Well LHPSD3 3/19/2008 0.52 0.50 Production Well LHPSD3 6/13/2008 0.39 0.37 Production Well LHPSD3 9/5/2008 0.67 0.64 Production Well LHPSD3 12/15/2008 1 0.96 Production Well LHPSD3 3/20/2009 0.79 0.76 Production Well LHPSD3 5/29/2009 1.1 1.1 Production Well LHPSD3 9/4/2009 1.1 1.1 Production Well LHPSD3 12/11/2009 1.2 1.2 Production Well LHPSD3 3/5/2010 0.79 0.76 Production Well LHPSD3 6/11/2010 0.73 0.7 Production Well LHPSD3 9/7/2010 1.5 1.4 Production Well LHPSD5 12/20/2001 7.660 Production Well LHPSD5 1/21/2002 6.220 Production Well LHPSD5 1/21/2002 (dup) 6.140 duplicate LHPSD5 2/22/2002 5.690 Production Well LHPSD5 3/26/2002 6.570 Production Well LHPSD5 4/23/2002 6.110 Production Well LHPSD5 8/21/2002 8.090 Production Well LHPSD5 10/16/2002 8.580 Production Well LHPSD5 2/26/2003 6.930 Production Well LHPSD5 2/26/2003 (dup) 7.160 duplicate LHPSD5 5/28/2003 6.920 Production Well LHPSD5 8/29/2003 8.970 Production Well LHPSD5 12/17/2003 4.670 Production Well LHPSD5 2/24/2004 10.1 Production Well LHP S D5 5/28/2004 8.64 Production Well



### 11/3/10 Page 9 of 48 Table 4.1

### Table 4.1 APFO and PFOA Results for Public Water Supply Sampling, West Virginia and Ohio Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Location Sample ID Sample Date A PFO (C-8) ug/ L PFOA ug/L* Comments Active Sampling Locations

LHPSD5 9/16/2004 13.4 Production Well LHPSD5 9/16/2004 (dup) 11.9 duplicate LHPSD5 11/29/2004 18.6 17.9 Production Well LHPSD5 11/29/2004 (dup) 16.9 16.2 duplicate LHPSD5 1/5/2005 9.03 8.67 Production Well LHPSD5 1/21/2005 6.61 6.35 Production Well LHPSD5 1/21/05 (dup) 6.06 5.82 duplicate LHPSD5 5/18/2005 15 14.4 Production Well LHPSD5 5/18/2005 (dup) 14 13.4 duplicate LHPSD5 7/13/2005 10.5 10.1 Production Well LHPSD5 7/13/2005 (dup) 11.1 10.7 duplicate LHPSD5 10/13/2005 14.7 14.1 Production Well LHPSD5 10/13/05 (dup) 15.9 15.3 duplicate LHPSD5 2/10/2006 10.7 10.3 Production Well LHPSD5 5/17/2006 16.1 15.5 Production Well LHPSD5 5/17/06 (dup) 14.4 13.8 duplicate LHPSD5 11/28/2007 6.9 6.6 Production Well LHPSD5 11/28/2007 (dup) 7.7 7.4 duplicate LHPSD5 3/19/2008 6.0 5.8 Production Well LHPSD5 3/19/08 (dup) 5.7 5.5 duplicate LHPSD5 6/13/2008 5 4.8 Production Well LHPSD5 6/13/08 (dup) 5.3 5.1 duplicate LHPSD5 9/5/2008 6.6 6.3 Production Well LHPSD5 9/5/08 (dup) 6.6 6.3 duplicate LHPSD5 12/15/2008 9 8.6 Production Well LHPSD5 12/15/08 (dup) 9.1 8.7 duplicate LHPSD5 3/20/2009 9.9 9.5 Production Well LHPSD5 3/20/2009 (dup) 10 9.6 duplicate LHPSD5 5/29/2009 8.2 7.9 Production Well LHPSD5 5/29/2009 (dup) 8.4 8.1 duplicate LHPSD5 9/4/2009 10 9.9 Production Well LHPSD5-2 9/4/2009 (dup) 10 10 duplicate

LHPSD5 12/11/2009 7.7 7.4 Production Well LHPSD5-2 12/11/2009 (dup) 8.7 8.4 Production Well-Dup

LHPSD5 3/5/2010 10 10 Production Well LHPSD5-2 3/5/2010 (dup) 10 9.9 Production Well-Dup

LHPSD5 6/11/2010 8.7 8.4 Production Well LHPSD5 6/11/2010 (dup) 9.6 9.2 Production Well-Dup LHPSD5 9/7/2010 8.5 8.2 Production Well LHPSD5-2 9/7/2010 9.3 8.9 Production Well-Dup LHPSDTW1 1/22/2002 2.160 Test well LHPSDTW1 8/21/2002 0.810 Test well LHPSDTW1 5/15/2006 4.740 4.550 Test well LHPSDTW2 1/22/2002 0.103 Test well LHPSDTW2 8/21/2002 0.081 Test well LHPSDTW3 1/22/2002 4.480 Test well LHPSDTW3 8/21/2002 4.170 Test well LHPSDTW3 5/15/2006 11.900 11.400 Test well LHPSDTW4 1/22/2002 37.100 Test well LHPSDTW4 3/26/2002 33.300 Test well LHPSDTW4 4/23/2002 28.700 Test well LHPSDTW4 8/21/2002 12.300 Test well LHPSDTW4 10/16/2002 14.500 Test well LHPSDTW4 2/26/2003 22.500 Test well LHPSDTW4 5/28/2003 33.300 Test Well LHPSDTW4 5/28/2003 (dup) 33.500 duplicate LHPSDTW4 8/29/2003 22.600 Test well LHPSDTW4 8/29/2003 (dup) 23.000 duplicate LHP S DTW4 5/15/2006 5.800 5.580 Test well



### 11/3/10 Page 10 of 48 Table 4.1

### Table 4.1 APFO and PFOA Results for Public Water Supply Sampling, West Virginia and Ohio Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Location Sample ID Sample Date A PFO (C-8) ug/ L PFOA ug/L* Comments Active Sampling Locations

LHPSDTW5 1/22/2002 0.364 Test well LHPSDTW5 8/21/2002 6.260 Test well LHPSDTW5 5/15/2006 15.200 14.600 Test well LHPSDTW6 1/22/2002 1.790 Test well LHPSDTW6 8/21/2002 1.150 Test well LHPSDTW6 8/21/2002 (dup) 1.230 duplicate LHPSDTW6 5/17/2006 3.100 2.980 Test well LHPSDTW6 9/20/2006 2.100 2.000 Test well LHPSDTW6 11/29/2006 1.900 1.800 Test well LHPSDTW6 3/21/2007 1.900 1.800 Test well LHPSDTW6 5/30/2007 2.200 2.100 Test well LHPSDTW6 9/12/2007 1.800 1.700 Test well LHPSDTW6 11/14/2007 1.700 1.600 Test well LHPSDTW6 3/19/2008 1.500 1.400 Test well LHPSDTW6S 5/17/2006 1.160 1.110 Test well LHPSDTW6S 9/20/2006 2.100 2.000 Test well LHPSDTW6S 11/29/2006 2.200 2.100 Test well LHPSDTW6S 3/21/2007 2.200 2.100 Test well LHPSDTW6S 5/30/2007 2.600 2.500 Test well LHPSDTW6S 9/12/2007 2.500 2.400 Test well LHPSDTW6S 11/14/2007 2.800 2.700 Test well LHPSDTW6S 3/19/2008 2.500 2.400 Test well

LHPSDTW9 1/22/2002 0.364 Test well LHPSDTW9 8/21/2002 0.812 Test well LHPSDTW9 5/15/2006 1.080 1.040 Test well LHPSDTW10 1/21/2002 1.900 Test well LHPSDTW10 8/21/2002 1.100 Test well LHPSDTW10 5/16/2006 5.020 4.820 Test well LHPSDTW11 1/21/2002 1.410 Test well LHPSDTW11 8/21/2002 1.730 Test well LHPSDWT11 5/15/2006 9.390 9.020 Test well LHPSDTW12 1/21/2002 0.758 Test well LHPSDTW12 8/21/2002 0.824 Test well LHPSDTW12 5/16/2006 1.780 1.710 Test well LHPSDTW12 9/20/2006 1.200 1.200 Test well LHPSDTW12 11/29/2006 1.100 1.100 Test well LHPSDTW12 3/20/2007 1.400 1.300 Test well LHPSDTW12 5/29/2007 1.500 1.400 Test well LHPSDTW12 9/11/2007 1.600 1.500 Test well LHPSDTW12 11/13/2007 1.100 1.100 Test well LHPSDTW12 3/19/2008 2.200 2.100 Test well LHPSDTW12S 5/16/2006 15.500 14.900 Test well LHPSDTW12S 9/20/2006 18.000 17.000 Test well LHPSDTW12S 11/29/2006 27.000 26.000 Test well LHPSDTW12S 3/20/2007 37.000 36.000 Test well LHPSDTW12S 5/29/2007 27.000 26.000 Test well LHPSDTW12S 9/11/2007 29.000 28.000 Test well LHPSDTW12S 11/13/2007 29.000 28.000 Test well LHPSDTW12S 3/19/2008 25.000 24.000 Test well LHPSDTW13D 4/11/2006 0.0795 0.0763 Temporary well point sample LHPSDTW13D 4/11/2006 (dup) 0.0794 0.0762 Temporary well point sample LHPSDTW13D 5/16/2006 0.4040 0.3880 Test well LHPSDTW13D 9/19/2006 0.1700 0.1600 Test well LHPSDTW13D 11/28/2006 0.1100 0.1100 Test well LHPSDTW13D 3/20/2007 0.1500 0.1400 Test well LHPSDTW13D 5/29/2007 0.0990 0.0950 Test well LHPSDTW13D 9/12/2007 0.1000 0.1000 Test well LHPSDTW13D 11/13/2007 0.4000 0.3800 Test well LHP S DTW 13 D 3/18/2008 0.6700 0.6400 Test well



### 11/3/10 Page 11 of 48 Table 4.1

### Table 4.1 APFO and PFOA Results for Public Water Supply Sampling, West Virginia and Ohio Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Location Sample ID Sample Date A PFO (C-8) ug/ L PFOA ug/L* Comments Active Sampling Locations

LHPSDTW13S 5/16/2006 70.9000 68.1000 Test well LHPSDTW13S 9/19/2006 67.0000 64.0000 Test well LHPSDTW13S 11/28/2006 55.0000 53.0000 Test well LHPSDTW13S 11/28/06 (dup) 52.0000 50.0000 Test well LHPSDTW13S 3/20/2007 51.0000 49.0000 Test well LHPSDTW13S 3/20/07 (dup) 51.0000 49.0000 Test well LHPSDTW13S 5/29/2007 60.0000 58.0000 Test well LHPSDTW13S 9/12/2007 67.0000 64.0000 Test well LHPSDTW13S 9/12/2007 (dup) 67.0000 64.0000 Test well LHPSDTW13S 11/13/2007 79.0000 76.0000 Test well LHPSDTW13S 11/13/07 (dup) 81.0000 78.0000 Test well LHPSDTW13S 3/18/2008 71.0000 68.0000 Test well LHPSDTW13S 3/18/08 (dup) 68.0000 65.0000 Test well LHPSDTW14D 4/6/2006 1.190 1.140 Temporary well point sample LHPSDTW14D 5/16/2006 1.680 1.610 Test well LHPSDTW14D 9/19/2006 1.100 1.100 Test well LHPSDTW14D 11/29/2006 0.780 0.750 Test well LHPSDTW14D 3/21/2007 0.640 0.610 Test well LHPSDTW14D 5/30/2007 0.880 0.850 Test well LHPSDTW14D 9/12/2007 1.000 1.000 Test well LHPSDTW14D 11/14/2007 0.800 0.770 Test well LHPSDTW14D 3/19/2008 0.410 0.390 Test well LHPSDTW14S 5/16/2006 53.900 51.800 Test well LHPSDTW14S 9/19/2006 45.000 43.000 Test well LHPSDTW14S 11/29/2006 41.000 39.000 Test well LHPSDTW14S 3/21/2007 34.000 33.000 Test well LHPSDTW14S 5/30/2007 30.000 29.000 Test well LHPSDTW14S 5/30/07 (dup) 33.000 32.000 Test well LHPSDTW14S 9/12/2007 33.000 32.000 Test well LHPSDTW14S 11/14/2007 31.000 30.000 Test well LHPSDTW14S 3/19/2008 35.000 34.000 Test well

TW15D-TWP 3/30/2006 0.237 0.228 Temporary well point sample LHPSDTW15D 5/16/2006 1.530 1.470 Test well LHPSDTW15D 5/16/06 (dup) 1.430 1.370 Test well LHPSDTW15D 9/20/2006 1.300 1.300 Test well LHPSDTW15D 11/28/2006 1.200 1.200 Test well LHPSDTW15D 3/21/2007 1.200 1.200 Test well LHPSDTW15D 5/30/2007 1.200 1.200 Test well LHPSDTW15D 9/12/2007 1.200 1.200 Test well LHPSDTW15D 11/14/2007 1.400 1.300 Test well LHPSDTW15D 3/18/2008 1.400 1.300 Test well

TW15S-TWP 5/16/2006 29.800 28.600 Test well LHPSDTW15S 9/20/2006 23.000 22.000 Test well LHPSDTW15S 9/20/06 (dup) 23.000 22.000 Test well LHPSDTW15S 11/28/2006 14.000 13.000 Test well LHPSDTW15S 3/21/2007 14.000 13.000 Test well LHPSDTW15S 5/30/2007 17.000 16.000 Test well LHPSDTW15S 9/12/2007 18.000 17.000 Test well LHPSDTW15S 11/14/2007 20.000 19.000 Test well LHPSDTW15S 3/18/2008 19.000 18.000 Test well LHPSDEP001 1/22/2002 1.690 Finished Water LHPSDEP001 3/26/2002 2.620 Finished Water LHPSDEP001 4/23/2002 1.930 Finished Water LHPSDEP001 10/16/2002 4.290 Finished Water LHPSDEP001 2/26/2003 2.330 Finished Water LHPSDEP001 5/28/2003 2.540 Finished Water LHPSDEP001 8/29/2003 3.730 Finished Water LHPSDEP001 12/17/2003 1.500 Finished Water LHP S DEP 001 2/24/2004 4.33 Finished Water



### 11/3/10 Page 12 of 48 Table 4.1

### Table 4.1 APFO and PFOA Results for Public Water Supply Sampling, West Virginia and Ohio Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Location Sample ID Sample Date A PFO (C-8) ug/ L PFOA ug/L* Comments Active Sampling Locations

LHPSDEP001 5/28/2004 3.64 Finished Water LHPSDEP001 9/16/2004 5.39 Finished Water LHPSDEP001 11/29/2004 7.2 6.92 Finished Water LHPSDEP001 1/21/2005 3.57 3.43 Finished Water LHPSDEP001 5/18/2005 5.64 5.42 Finished Water LHPSDEP001 7/13/2005 3.5 3.36 Finished Water LHPSDEP001 10/13/2005 4.28 4.11 Finished Water LHPSDEP001 2/10/2006 2.9 2.78 Finished Water LHPSDEP001 5/17/2006 3.48 3.35 Finished Water LHPSDEP001 9/20/2006 2.8 2.7 Finished Water LHPSDEP001 11/29/2006 2.8 2.7 Finished Water LHPSDEP001 3/21/2007 2.4 2.3 Finished Water LHPSDEP001 5/30/2007 3.4 3.3 Finished Water LHPSDEP001 9/12/2007 2.7 2.6 Finished Water LHPSDEP001 11/14/2007 0.04 0.038 Finished Water LHPSDEP001 3/19/2008 ND (<0.0022) ND (<0.0022) Finished Water LHTORCHBS 1/22/2002 1.850 Booster Station Sample BARTLETTCC 1/22/2002 1.940 Booster Station Sample 339B STA 1/22/2002 1.810 Booster Station Sample

Rigblan k 3/28/2006 NQ (<0.0049) NQ (<0.0049) 2006 Investigation Samples Pumpblank 3/31/2006 ND (<0.001) ND (<0.001) 2006 Investigation Samples HYDRO H2O-LHWA-1 8/7/2007 3.100 3.000 GAC Construction Sample HYDRO H2O-LHWA-2 9/7/2007 3.200 3.100 GAC Construction Sample HYDRO H2O-LHWA-3 9/17/2007 3.800 3.700 GAC Construction Sample HYDRO H2O-LHWA-4 9/25/2007 2.800 2.700 GAC Construction Sample HYDRO H2O-LHWA-5 10/9/2007 2.000 1.900 GAC Construction Sample HYDRO-LHWA 9/20/2010 NQ (<0.012) NQ (<0.012) GAC Construction Samples C-STALL-LHWA-W-PV1 9/18/2007 0.180 0.170 GAC Construction Sample C-STALL-LHWA-W-PV2 9/18/2007 0.200 0.190 GAC Construction Sample C-STALL-LHWA 3/5/2008 0.120 0.120 NPDES Discharge Monitoring C-STALL-LHWA 5/22/2008 0.029 0.028 NPDES Discharge Monitoring C-STALL-LHWA 7/15/2008 0.043 0.041 NPDES Discharge Monitoring C-STALL-LHWA 9/30/2008 0.280 0.270 NPDES Discharge Monitoring C-STALL-LHWA 12/22/2008 0.029 0.028 NPDES Discharge Monitoring C-STALL-LHWA 3/13/2009 0.027 0.026 NPDES Discharge Monitoring C-STALL-LHWA 5/14/2009 0.099 0.095 NPDES Discharge Monitoring C-STALL-LHWA 7/7/2009 0.18 0.17 NPDES Discharge Monitoring C-STALL-LHWA 9/24/2009 0.064 0.061 NPDES Discharge Monitoring C-STALL-LHWA 12/3/2009 NQ (<0.01) NQ (<0.01) NPDES Discharge Monitoring C-STALL-LHWA 4/16/2010 0.18 0.17 NPDES Discharge Monitoring C-STALL-LHWA 6/14/2010 0.2 0.19 NPDES Discharge Monitoring C-STALL-LHWA 8/17/2010 0.3 0.29 NPDES Discharge Monitoring BWASH-LHWA-E 9/19/2007 0.084 0.081 GAC Construction Sample BWASH-LHWA-W 9/19/2007 0.078 0.075 GAC Construction Sample BWASH-LHWA-E 12/21/2007 1.800 1.700 NPDES Discharge Monitoring BWASH-LHWA-W 12/21/2007 2.100 2.000 NPDES Discharge Monitoring BWASH-LHWA-E 1/11/2008 0.011 0.011 NPDES Discharge Monitoring BWASH-LHWA-W 1/11/2008 0.015 0.014 NPDES Discharge Monitoring BWASH-LHWA-E 3/6/2008 NQ (<0.011) NQ (<0.011) NPDES Discharge Monitoring BWASH-LHWA-W 3/6/2008 0.021 0.020 NPDES Discharge Monitoring BWASH-LHWA-E 5/23/2008 NQ (<0.0096) NQ (<0.0096) NPDES Discharge Monitoring BWASH-LHWA-W 5/23/2008 NQ (<0.0096) NQ (<0.0096) NPDES Discharge Monitoring BWASH-LHWA-E 7/16/2008 0.041 0.039 NPDES Discharge Monitoring BWASH-LHWA-W 7/16/2008 0.026 0.025 NPDES Discharge Monitoring BWASH-LHWA-E 10/1/2008 NQ (<0.0085) NQ (<0.0085) NPDES Discharge Monitoring BWASH-LHWA-W 10/1/2008 NQ (<0.0085) NQ (<0.0085) NPDES Discharge Monitoring BWASH-LHWA-E 12/23/2008 NQ (<0.013) NQ (<0.013) NPDES Discharge Monitoring BWASH-LHWA-W 12/23/2008 NQ (<0.013) NQ (<0.013) NPDES Discharge Monitoring BWA S H-LHWA-E 3/6/2009 0.720 0.690 NPDE S Discharge Monitoring



### 11/3/10 Page 13 of 48 Table 4.1

### Table 4.1 APFO and PFOA Results for Public Water Supply Sampling, West Virginia and Ohio Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Location Sample ID Sample Date A PFO (C-8) ug/ L PFOA ug/L* Comments Active Sampling Locations

BWASH-LHWA-W 3/6/2009 1.500 1.400 NPDES Discharge Monitoring BWASH-LHWA-W 3/14/2009 NQ (<0.013) NQ (<0.013) NPDES Discharge Monitoring BWASH-LHWA-W 5/6/2009 0.84 0.81 NPDES Discharge Monitoring BWASH-LHWA 5/15/2009 NQ (<0.013) NQ (<0.013) NPDES Discharge Monitoring BWASH-LHWA 7/8/2009 0.028 0.027 NPDES Discharge Monitoring BWASH-LHWA 7/9/2009 ND(<0.0026 ) ND(<0.0026 ) NPDES Discharge Monitoring BWASH-LHWA-2W 9/15/2009 2.5 2.4 NPDES Discharge Monitoring BWASH-LHWA 9/25/2009 0.03 0.029 NPDES Discharge Monitoring BWASH-LHWA 12/4/2009 ND(<0.0021 ) ND(<0.0021 ) NPDES Discharge Monitoring BWASH-LHWA 1/7/2010 0.43 0.41 NPDES Discharge Monitoring BWASH-LHWA 1/26/2010 ND(<0.0035 ) ND(<0.0035 ) NPDES Discharge Monitoring BWASH-LHWA 4/2/2010 5 4.8 NPDES Discharge Monitoring BWASH-LHWA 4/17/2010 ND(<0.0038 ) ND(<0.0038 ) NPDES Discharge Monitoring BWASH-LHWA 6/10/2010 2.9 2.8 NPDES Discharge Monitoring BWASH-LHWA 6/15/2010 NQ (<0.019) NQ (<0.019) NPDES Discharge Monitoring BWASH-LHWA 8/18/2010 ND(<0.0025 ) ND(<0.0025 ) NPDES Discharge Monitoring BWASH-LHWA 9/24/2010 0.12 0.12 NPDES Discharge MonitoringLHWAPSD-CONTACTTANKDIP 11/27/2007 0.034 0.033 GAC System Samples LHWAPSD-PUMP3- RUNNING 11/27/2007 0.032 0.031 GAC System Samples LHWAPSD-PUMP3- STOPPED 11/27/2007 0.034 0.033 GAC System Samples LHWAPSD-PRECHEMFEED 12/10/2007 ND (<0.0031) ND (<0.0031) Prior to Chlorine Contact Tank POSTCHEMFEED 12/10/2007 ND (<0.0031) ND (<0.0031) Prior to Chlorine Contact Tank LHWAPSD-PT-EAST 10/16/2007 2.400 2.300 Prior Carbon Treatment LHWAPSD-BED1E-LEAD 10/16/2007 0.042 0.040 After Treatment Sample

LHWAPSD-BED2E-LAG 10/16/2007 ND (<0.0031) ND (<0.0031) After Treatment Sample LHWAPSD-BED1W-LEAD 10/16/2007 ND (<0.0031) ND (<0.0031) After Treatment Sample

LHWAPSD-BED2W-LAG 10/16/2007 ND (<0.0031) ND (<0.0031) After Treatment Sample LHWAPSD-PT 11/2/2007 2.900 2.800 Prior Carbon Treatment LHWAPSD-BED1E-LEAD 11/2/2007 ND (<0.0031) ND (<0.0031) After Treatment Sample

LHWAPSD-BED2E-LAG 11/2/2007 ND (<0.0031) ND (<0.0031) After Treatment Sample LHWAPSD-BED1W-LEAD 11/2/2007 ND (<0.0031) ND (<0.0031) After Treatment Sample

LHWAPSD-BED2W-LAG 11/2/2007 ND (<0.0031) ND (<0.0031) After Treatment SampleLHWAPSD-ATCONTACTTANK 11/2/2007 0.028 0.027 Chlorine Contact Tank Effluent

LHWAPSD-PT 11/14/2007 4.000 3.800 Prior Carbon Treatment LHWAPSD-BED1E-LEAD 11/14/2007 NQ (<0.016) NQ (<0.016) After Treatment Sample

LHWAPSD-BED2E-LAG 11/14/2007 NQ (<0.016) NQ (<0.016) After Treatment Sample LHWAPSD-BED1W-LEAD 11/14/2007 ND (<0.0031) ND (<0.0031) After Treatment Sample

LHWAPSD-BED2W-LAG 11/14/2007 ND (<0.0031) ND (<0.0031) After Treatment SampleLHWAPSD-ATCONTACTTANK-PUMP 11/14/2007 0.031 0.030 Chlorine Contact Tank EffluentLHWAPSD-ATCONTACTTANK-SINK 11/14/2007 0.029 0.028 Chlorine Contact Tank Effluent LHWAPSD-PT 11/27/2007 4.900 4.700 Prior Carbon Treatment LHWAPSD-BED1E-LEAD 11/27/2007 NQ (<0.016) NQ (<0.016) After Treatment Sample

LHWAPSD-BED2E-LAG 11/27/2007 ND (<0.0031) ND (<0.0031) After Treatment Sample LHWAPSD-BED1W-LEAD 11/27/2007 ND (<0.0031) ND (<0.0031) After Treatment Sample

LHWAPSD-BED2W-LAG 11/27/2007 ND (<0.0031) ND (<0.0031) After Treatment Sample LHWAPSD-PT 12/10/2007 3.300 3.200 Prior Carbon Treatment LHWAPSD-BED1E-LEAD 12/10/2007 0.021 0.020 After Treatment Sample

LHWAPSD-BED2E-LAG 12/10/2007 ND (<0.0031) ND (<0.0031) After Treatment Sample LHWAPSD-BED1W-LEAD 12/10/2007 ND (<0.0031) ND (<0.0031) After Treatment Sample

LHWAPSD-BED2W-LAG 12/10/2007 ND (<0.0031) ND (<0.0031) After Treatment Sample LHWAPSD-PT 12/27/2007 2.400 2.300 Prior Carbon Treatment LHWAPSD-BED1E-LEAD 12/27/2007 0.055 0.053 After Treatment Sample

LHWAP S D-BED 2 E-LA G 12/27/2007 ND (<0.0031) ND (<0.0031) After Treatment Sample



### 11/3/10 Page 14 of 48 Table 4.1

### Table 4.1 APFO and PFOA Results for Public Water Supply Sampling, West Virginia and Ohio Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Location Sample ID Sample Date A PFO (C-8) ug/ L PFOA ug/L* Comments Active Sampling Locations

LHWAPSD-BED1W-LEAD 12/27/2007 NQ (<0.016) NQ (<0.016) After Treatment Sample

LHWAPSD-BED2W-LAG 12/27/2007 ND (<0.0031) ND (<0.0031) After Treatment SampleLHWAPSD-ATCONTACTTANK 12/27/2007 ND (<0.0031) ND (<0.0031) Chlorine Contact Tank Effluent

LHWAPSD-PT 1/10/2008 1.900 1.800 Prior Carbon Treatment LHWAPSD-BED1E-LEAD 1/10/2008 0.068 0.065 After Treatment Sample

LHWAPSD-BED2E-LAG 1/10/2008 ND (<0.0022) ND (<0.0022) After Treatment Sample LHWAPSD-BED1W-LEAD 1/10/2008 0.018 0.017 After Treatment Sample

LHWAPSD-BED2W-LAG 1/10/2008 ND (<0.0022) ND (<0.0022) After Treatment Sample LHWAPSD-PT 1/24/2008 3.600 3.500 Prior Carbon Treatment LHWAPSD-BED1E-LAG 1/24/2008 ND (<0.0022) ND (<0.0022) After Treatment Sample LHWAPSD-BED2E-LEAD 1/24/2008 NQ (<0.011) NQ (<0.011) After Treatment Sample LHWAPSD-BED1W-LAG 1/24/2008 ND (<0.0022) ND (<0.0022) After Treatment Sample LHWAPSD-BED2W-LEAD 1/24/2008 ND (<0.0022) ND (<0.0022) After Treatment SampleLHWAPSD-ATCONTACTTANK 1/24/2008 ND (<0.0022) ND (<0.0022) Chlorine Contact Tank Effluent

LHWAPSD-PT 2/7/2008 2.900 2.800 Prior Carbon Treatment LHWAPSD-BED1E-LAG 2/7/2008 ND (<0.0022) ND (<0.0022) After Treatment Sample LHWAPSD-BED2E-LEAD 2/7/2008 0.051 0.049 After Treatment Sample LHWAPSD-BED1W-LAG 2/7/2008 ND (<0.0022) ND (<0.0022) After Treatment Sample LHWAPSD-BED2W-LEAD 2/7/2008 NQ (<0.011) NQ (<0.011) After Treatment Sample LHWAPSD-PT 2/21/2008 3.2 3.1 Prior to Treatment Sample LHWAPSD-BED1E-LAG 2/21/2008 ND (<0.0022) ND (<0.0022) After Carbon Treatment Sample LHWAPSD-BED2E-LEAD 2/21/2008 0.17 0.16 After Carbon Treatment Sample LHWAPSD-BED1W-LAG 2/21/2008 ND (<0.0022) ND (<0.0022) After Carbon Treatment Sample LHWAPSD-BED2W-LEAD 2/21/2008 0.034 0.033 After Carbon Treatment SampleLHWAPSD-ATCONTACTTANK 2/21/2008 ND (<0.0022) ND (<0.0022) GAC System Samples

LHWAPSD-PT 3/6/2008 3.7 3.6 Prior Carbon Treatment LHWAPSD-BED1E-LEAD 3/6/2008 ND (<0.0022) ND (<0.0022) After Treatment Sample

LHWAPSD-BED2E-LAG 3/6/2008 ND (<0.0022) ND (<0.0022) After Treatment Sample LHWAPSD-BED1W-LEAD 3/6/2008 ND (<0.0022) ND (<0.0022) After Treatment Sample

LHWAPSD-BED2W-LAG 3/6/2008 ND (<0.0022) ND (<0.0022) After Treatment Sample LHWAPSD-PT 3/19/2008 2.900 2.800 Prior Carbon Treatment LHWAPSD-BED1E-LEAD 3/19/2008 ND (<0.0022) ND (<0.0022) After Treatment Sample

LHWAPSD-BED2E-LAG 3/19/2008 ND (<0.0022) ND (<0.0022) After Treatment Sample LHWAPSD-BED1W-LEAD 3/19/2008 ND (<0.0022) ND (<0.0022) After Treatment Sample

LHWAPSD-BED2W-LAG 3/19/2008 ND (<0.0022) ND (<0.0022) After Treatment SampleLHWAPSD-ATCONTACTTANK 3/19/2008 ND (<0.0022) ND (<0.0022) GAC System Samples

LHWAPSD-PT 4/2/2008 2.100 2.000 Prior Carbon Treatment LHWAPSD-BED1E-LEAD 4/2/2008 NQ (<0.0096) NQ (<0.0096) After Treatment Sample

LHWAPSD-BED2E-LAG 4/2/2008 ND (<0.0019) ND (<0.0019) After Treatment Sample LHWAPSD-BED1W-LEAD 4/2/2008 ND (<0.0019) ND (<0.0019) After Treatment Sample

LHWAPSD-BED2W-LAG 4/2/2008 ND (<0.0019) ND (<0.0019) After Treatment Sample LHWAPSD-PT 4/18/2008 2.800 2.700 Prior Carbon Treatment LHWAPSD-BED1E-LEAD 4/18/2008 NQ (<0.0096) NQ (<0.0096) After Treatment Sample

LHWAPSD-BED2E-LAG 4/18/2008 ND (<0.0019) ND (<0.0019) After Treatment Sample LHWAPSD-BED1W-LEAD 4/18/2008 ND (<0.0019) ND (<0.0019) After Treatment Sample

LHWAPSD-BED2W-LAG 4/18/2008 ND (<0.0019) ND (<0.0019) After Treatment SampleLHWAPSD-ATCONTACTTANK 4/18/2008 ND (<0.0019) ND (<0.0019) GAC System Samples

LHWAPSD-PT 5/2/2008 4.700 4.500 Prior Carbon Treatment LHWAPSD-BED1E-LEAD 5/2/2008 0.060 0.058 After Treatment Sample

LHWAPSD-BED2E-LAG 5/2/2008 ND (<0.0019) ND (<0.0019) After Treatment Sample LHWAPSD-BED1W-LEAD 5/2/2008 0.017 0.016 After Treatment Sample

LHWAPSD-BED2W-LAG 5/2/2008 ND (<0.0019) ND (<0.0019) After Treatment Sample LHWAPSD-PT 5/16/2008 3.500 3.400 Prior Carbon Treatment LHWAP S D-BED 1 E-LEAD 5/16/2008 0.081 0.078 After Treatment Sample



### 11/3/10 Page 15 of 48 Table 4.1

### Table 4.1 APFO and PFOA Results for Public Water Supply Sampling, West Virginia and Ohio Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Location Sample ID Sample Date A PFO (C-8) ug/ L PFOA ug/L* Comments Active Sampling Locations

LHWAPSD-BED2E-LAG 5/16/2008 ND (<0.0019) ND (<0.0019) After Treatment Sample LHWAPSD-BED1W-LEAD 5/16/2008 0.051 0.049 After Treatment Sample

LHWAPSD-BED2W-LAG 5/16/2008 ND (<0.0019) ND (<0.0019) After Treatment SampleLHWAPSD-ATCONTACTTANK 5/16/2008 ND (<0.0019) ND (<0.0019) GAC System Samples

LHWAPSD-PT 5/30/2008 3.300 3.200 Prior Carbon Treatment LHWAPSD-BED1E-LAG 5/30/2008 ND (<0.0019) ND (<0.0019) After Treatment Sample LHWAPSD-BED2E-LEAD 5/30/2008 ND (<0.0019) ND (<0.0019) After Treatment Sample LHWAPSD-BED1W-LAG 5/30/2008 ND (<0.0019) ND (<0.0019) After Treatment Sample LHWAPSD-BED2W-LEAD 5/30/2008 ND (<0.0019) ND (<0.0019) After Treatment Sample LHWAPSD-PT 6/13/2008 3.600 3.500 Prior Carbon Treatment LHWAPSD-BED1E-LAG 6/13/2008 ND (<0.0019) ND (<0.0019) After Treatment Sample LHWAPSD-BED2E-LEAD 6/13/2008 0.011 0.011 After Treatment Sample LHWAPSD-BED1W-LAG 6/13/2008 ND (<0.0019) ND (<0.0019) After Treatment Sample LHWAPSD-BED2W-LEAD 6/13/2008 ND (<0.0019) ND (<0.0019) After Treatment SampleLHWAPSD-ATCONTACTTANK 6/13/2008 ND (<0.0019) ND (<0.0019) GAC System Samples

LHWAPSD-PT 6/27/2008 3.600 3.500 Prior Carbon Treatment LHWAPSD-BED1E-LAG 6/27/2008 ND (<0.0023) ND (<0.0023) After Treatment Sample LHWAPSD-BED2E-LEAD 6/27/2008 0.050 0.048 After Treatment Sample LHWAPSD-BED1W-LAG 6/27/2008 ND (<0.0023) ND (<0.0023) After Treatment Sample LHWAPSD-BED2W-LEAD 6/27/2008 0.015 0.014 After Treatment Sample LHWAPSD-PT 7/11/2008 4.300 4.100 Prior Carbon Treatment LHWAPSD-BED1E-LAG 7/11/2008 ND (<0.0023) ND (<0.0023) After Treatment Sample LHWAPSD-BED2E-LEAD 7/11/2008 0.120 0.120 After Treatment Sample LHWAPSD-BED1W-LAG 7/11/2008 ND (<0.0023) ND (<0.0023) After Treatment Sample LHWAPSD-BED2W-LEAD 7/11/2008 0.066 0.063 After Treatment SampleLHWAPSD-ATCONTACTTANK 7/11/2008 ND (<0.0023) ND (<0.0023) GAC System Samples

LHWAPSD-PT 7/25/2008 4.800 4.600 Prior Carbon Treatment LHWAPSD-BED1E-LEAD 7/25/2008 ND (<0.0023) ND (<0.0023) After Treatment Sample

LHWAPSD-BED2E-LAG 7/25/2008 NQ (<0.012) NQ (<0.012) After Treatment Sample LHWAPSD-BED1W-LEAD 7/25/2008 ND (<0.0023) ND (<0.0023) After Treatment Sample

LHWAPSD-BED2W-LAG 7/25/2008 ND (<0.0023) ND (<0.0023) After Treatment Sample LHWAPSD-PT 8/6/2008 4.600 4.400 Prior Carbon Treatment LHWAPSD-BED1E-LEAD 8/6/2008 ND (<0.0023) ND (<0.0023) After Treatment Sample

LHWAPSD-BED2E-LAG 8/6/2008 ND (<0.0023) ND (<0.0023) After Treatment Sample LHWAPSD-BED1W-LEAD 8/6/2008 ND (<0.0023) ND (<0.0023) After Treatment Sample

LHWAPSD-BED2W-LAG 8/6/2008 ND (<0.0023) ND (<0.0023) After Treatment SampleLHWAPSD-ATCONTACTTANK 8/6/2008 ND (<0.0023) ND (<0.0023) GAC System Samples

LHWAPSD-PT 8/22/2008 4.700 4.500 Prior Carbon Treatment LHWAPSD-BED1E-LEAD 8/22/2008 ND (<0.0023) ND (<0.0023) After Treatment Sample

LHWAPSD-BED2E-LAG 8/22/2008 ND (<0.0023) ND (<0.0023) After Treatment Sample LHWAPSD-BED1W-LEAD 8/22/2008 ND (<0.0023) ND (<0.0023) After Treatment Sample

LHWAPSD-BED2W-LAG 8/22/2008 ND (<0.0023) ND (<0.0023) After Treatment Sample LHWAPSD-PT 9/5/2008 4.600 4.400 Prior Carbon Treatment LHWAPSD-BED1E-LEAD 9/5/2008 0.014 0.013 After Treatment Sample

LHWAPSD-BED2E-LAG 9/5/2008 ND (<0.0023) ND (<0.0023) After Treatment Sample LHWAPSD-BED1W-LEAD 9/5/2008 ND (<0.0023) ND (<0.0023) After Treatment Sample

LHWAPSD-BED2W-LAG 9/5/2008 ND (<0.0023) ND (<0.0023) After Treatment SampleLHWAPSD-ATCONTACTTANK 9/5/2008 ND (<0.0023) ND (<0.0023) GAC System Samples

LHWAPSD-PT 9/19/2008 3.700 3.600 Prior Carbon Treatment LHWAPSD-BED1E-LEAD 9/19/2008 0.052 0.050 After Treatment Sample

LHWAPSD-BED2E-LAG 9/19/2008 ND (<0.0023) ND (<0.0023) After Treatment Sample LHWAPSD-BED1W-LEAD 9/19/2008 NQ (<0.012) NQ (<0.012) After Treatment Sample

LHWAPSD-BED2W-LAG 9/19/2008 ND (<0.0023) ND (<0.0023) After Treatment Sample LHWAP S D-PT 10/3/2008 5.000 4.800 Prior Carbon Treatment



### 11/3/10 Page 16 of 48 Table 4.1

### Table 4.1 APFO and PFOA Results for Public Water Supply Sampling, West Virginia and Ohio Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Location Sample ID Sample Date A PFO (C-8) ug/ L PFOA ug/L* Comments Active Sampling Locations

LHWAPSD-BED1E-LAG 10/3/2008 ND(<0.0017 ) ND(<0.0017 ) After Treatment Sample LHWAPSD-BED2E-LEAD 10/3/2008 ND(<0.0017 ) ND(<0.0017 ) After Treatment Sample LHWAPSD-BED1W-LAG 10/3/2008 ND(<0.0017 ) ND(<0.0017 ) After Treatment Sample LHWAPSD-BED2W-LEAD 10/3/2008 ND(<0.0017 ) ND(<0.0017 ) After Treatment SampleLHWAPSD-ATCONTACTTANK 10/3/2008 ND(<0.0017 ) ND(<0.0017 ) GAC System Samples

LHWAPSD-PT 10/17/2008 5.200 5.000 Prior Carbon Treatment LHWAPSD-BED1E-LAG 10/17/2008 ND(<0.0017 ) ND(<0.0017 ) After Treatment Sample LHWAPSD-BED2E-LEAD 10/17/2008 ND(<0.0017 ) ND(<0.0017 ) After Treatment Sample LHWAPSD-BED1W-LAG 10/17/2008 ND(<0.0017 ) ND(<0.0017 ) After Treatment Sample LHWAPSD-BED2W-LEAD 10/17/2008 ND(<0.0017 ) ND(<0.0017 ) After Treatment Sample LHWAPSD-PT 10/31/2008 4.800 4.600 Prior Carbon Treatment LHWAPSD-BED1E-LAG 10/31/2008 ND(<0.0017 ) ND(<0.0017 ) After Treatment Sample LHWAPSD-BED2E-LEAD 10/31/2008 ND(<0.0017 ) ND(<0.0017 ) After Treatment Sample LHWAPSD-BED1W-LAG 10/31/2008 ND(<0.0017 ) ND(<0.0017 ) After Treatment Sample LHWAPSD-BED2W-LEAD 10/31/2008 ND(<0.0017 ) ND(<0.0017 ) After Treatment SampleLHWAPSD-ATCONTACTTANK 10/31/2008 ND(<0.0017 ) ND(<0.0017 ) GAC System Samples

LHWAPSD-PT 11/14/2008 5.400 5.200 Prior Carbon Treatment LHWAPSD-BED1E-LAG 11/14/2008 ND(<0.0017 ) ND(<0.0017 ) After Treatment Sample LHWAPSD-BED2E-LEAD 11/14/2008 NQ (<0.0085) NQ (<0.0085) After Treatment Sample LHWAPSD-BED1W-LAG 11/14/2008 ND(<0.0017 ) ND(<0.0017 ) After Treatment Sample LHWAPSD-BED2W-LEAD 11/14/2008 ND(<0.0017 ) ND(<0.0017 ) After Treatment Sample LHWAPSD-PT 12/1/2008 4.400 4.200 Prior Carbon Treatment LHWAPSD-BED1E-LAG 12/1/2008 ND(<0.0017 ) ND(<0.0017 ) After Treatment Sample LHWAPSD-BED2E-LEAD 12/1/2008 0.019 0.018 After Treatment Sample LHWAPSD-BED1W-LAG 12/1/2008 ND(<0.0017 ) ND(<0.0017 ) After Treatment Sample LHWAPSD-BED2W-LEAD 12/1/2008 0.012 0.012 After Treatment SampleLHWAPSD-ATCONTACTTANK 12/1/2008 ND(<0.0017 ) ND(<0.0017 ) GAC System Samples

LHWAPSD-PT 12/15/2008 5.400 5.200 Prior Carbon Treatment LHWAPSD-BED1E-LAG 12/15/2008 ND(<0.0017 ) ND(<0.0017 ) After Treatment Sample LHWAPSD-BED2E-LEAD 12/15/2008 0.078 0.075 After Treatment Sample LHWAPSD-BED1W-LAG 12/15/2008 ND(<0.0017 ) ND(<0.0017 ) After Treatment Sample LHWAPSD-BED2W-LEAD 12/15/2008 0.074 0.071 After Treatment Sample LHWAPSD-PT 12/29/2008 6.000 5.800 Prior Carbon Treatment LHWAPSD-BED1E-LEAD 12/29/2008 ND(<0.0017 ) ND(<0.0017 ) After Treatment Sample

LHWAPSD-BED2E-LAG 12/29/2008 ND(<0.0017 ) ND(<0.0017 ) After Treatment Sample LHWAPSD-BED1W-LEAD 12/29/2008 ND(<0.0017 ) ND(<0.0017 ) After Treatment Sample

LHWAPSD-BED2W-LAG 12/29/2008 ND(<0.0017 ) ND(<0.0017 ) After Treatment SampleLHWAPSD-ATCONTACTTANK 12/29/2008 ND(<0.0017 ) ND(<0.0017 ) GAC System Samples

LHWAPSD-PT 1/9/2009 5.1 4.9 Prior Carbon Treatment LHWAPSD-BED1E-LEAD 1/9/2009 ND(<0.0026 ) ND(<0.0026 ) After Treatment Sample

LHWAPSD-BED2E-LAG 1/9/2009 ND(<0.0026 ) ND(<0.0026 ) After Treatment Sample LHWAPSD-BED1W-LEAD 1/9/2009 ND(<0.0026 ) ND(<0.0026 ) After Treatment Sample

LHWAPSD-BED2W-LAG 1/9/2009 ND(<0.0026 ) ND(<0.0026 ) After Treatment Sample LHWAPSD-PT 1/23/2009 6.1 5.9 Prior Carbon Treatment LHWAPSD-BED1E-LEAD 1/23/2009 ND(<0.0026 ) ND(<0.0026 ) After Treatment Sample

LHWAPSD-BED2E-LAG 1/23/2009 ND(<0.0026 ) ND(<0.0026 ) After Treatment Sample LHWAPSD-BED1W-LEAD 1/23/2009 ND(<0.0026 ) ND(<0.0026 ) After Treatment Sample

LHWAPSD-BED2W-LAG 1/23/2009 ND(<0.0026 ) ND(<0.0026 ) After Treatment SampleLHWAPSD-ATCONTACTTANK 1/23/2009 ND(<0.0026 ) ND(<0.0026 ) GAC System Samples

LHWAPSD-PT 2/6/2009 5.9 5.7 Prior Carbon Treatment LHWAPSD-BED1E-LEAD 2/6/2009 NQ (<0.013) NQ (<0.013) After Treatment Sample

LHWAPSD-BED2E-LAG 2/6/2009 ND(<0.0026 ) ND(<0.0026 ) After Treatment Sample LHWAPSD-BED1W-LEAD 2/6/2009 ND(<0.0026 ) ND(<0.0026 ) After Treatment Sample

LHWAP S D-BED 2 W-LA G 2/6/2009 ND(<0.0026 ) ND(<0.0026 ) After Treatment Sample



### 11/3/10 Page 17 of 48 Table 4.1

### Table 4.1 APFO and PFOA Results for Public Water Supply Sampling, West Virginia and Ohio Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Location Sample ID Sample Date A PFO (C-8) ug/ L PFOA ug/L* Comments Active Sampling Locations

LHWAPSD-PT 2/20/2009 5.4 5.2 Prior Carbon Treatment LHWAPSD-BED1E-LEAD 2/20/2009 0.022 0.021 After Treatment Sample

LHWAPSD-BED2E-LAG 2/20/2009 ND(<0.0026 ) ND(<0.0026 ) After Treatment Sample LHWAPSD-BED1W-LEAD 2/20/2009 ND(<0.0026 ) ND(<0.0026 ) After Treatment Sample

LHWAPSD-BED2W-LAG 2/20/2009 ND(<0.0026 ) ND(<0.0026 ) After Treatment SampleLHWAPSD-ATCONTACTTANK 2/20/2009 ND(<0.0026 ) ND(<0.0026 ) GAC System Samples

LHWAPSD-PT 3/6/2009 6.7 6.4 Prior Carbon Treatment LHWAPSD-BED1E-LEAD 3/6/2009 0.07 0.067 After Treatment Sample

LHWAPSD-BED2E-LAG 3/6/2009 ND(<0.0026 ) ND(<0.0026 ) After Treatment Sample LHWAPSD-BED1W-LEAD 3/6/2009 NQ (<0.013) NQ (<0.013) After Treatment Sample

LHWAPSD-BED2W-LAG 3/6/2009 ND(<0.0026 ) ND(<0.0026 ) After Treatment Sample LHWAPSD-PT 3/20/2009 6.2 6 Prior to Treatment Sample LHWAPSD-BED2E-LEAD 3/20/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample

LHWAPSD-BED1E-LAG 3/20/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample LHWAPSD-BED2W-LEAD 3/20/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample

LHWAPSD-BED1W-LAG 3/20/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment SampleLHWAPSD-ATCONTACTTANK 3/20/2009 ND(<0.0026 ) ND(<0.0026 ) GAC System Samples

LHWAPSD-PT 4/3/2009 5.1 4.9 Prior to Treatment Sample LHWAPSD-BED2E-LEAD 4/3/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample

LHWAPSD-BED1E-LAG 4/3/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample LHWAPSD-BED2W-LEAD 4/3/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample

LHWAPSD-BED1W-LAG 4/3/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample LHWAPSD-PT 4/17/2009 4.6 4.4 Prior to Treatment Sample LHWAPSD-BED2E-LEAD 4/17/2009 0.028 0.027 After Carbon Treatment Sample

LHWAPSD-BED1E-LAG 4/17/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample LHWAPSD-BED2W-LEAD 4/17/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample

LHWAPSD-BED1W-LAG 4/17/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment SampleLHWAPSD-ATCONTACTTANK 4/17/2009 ND(<0.0026 ) ND(<0.0026 ) GAC System Samples

LHWAP S D-PT 5/1/2009 4.9 4.7 Prior to Treatment S ample LHWAPSD-BED2E-LEAD 5/1/2009 0.17 0.16 After Carbon Treatment Sample

LHWAPSD-BED1E-LAG 5/1/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample LHWAPSD-BED2W-LEAD 5/1/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample

LHWAPSD-BED1W-LAG 5/1/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample LHWAPSD-PT 5/15/2009 4.3 4.1 Prior to Treatment Sample LHWAPSD-BED1E-LEAD 5/15/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample

LHWAPSD-BED2E-LAG 5/15/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample LHWAPSD-BED1W-LEAD 5/15/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample

LHWAPSD-BED2W-LAG 5/15/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment SampleLHWAPSD-ATCONTACTTANK 5/15/2009 ND(<0.0026 ) ND(<0.0026 ) GAC System Samples

LHWAPSD-PT 5/29/2009 6.6 6.3 Prior to Treatment Sample LHWAPSD-BED1E-LEAD 5/29/2009 NQ (<0.013) NQ (<0.013) After Carbon Treatment Sample

LHWAPSD-BED2E-LAG 5/29/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample LHWAPSD-BED1W-LEAD 5/29/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample

LHWAPSD-BED2W-LAG 5/29/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample LHWAPSD-PT 6/12/2009 6 5.8 Prior to Treatment Sample LHWAPSD-BED1E-LEAD 6/12/2009 0.12 0.12 After Carbon Treatment Sample

LHWAPSD-BED2E-LAG 6/12/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample LHWAPSD-BED1W-LEAD 6/12/2009 NQ (<0.013) NQ (<0.013) After Carbon Treatment Sample

LHWAPSD-BED2W-LAG 6/12/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment SampleLHWAPSD-ATCONTACTTANK 6/12/2009 ND(<0.0026 ) ND(<0.0026 ) GAC System Samples

LHWAPSD-PT 6/26/2009 6.7 6.4 Prior to Treatment Sample LHWAPSD-BED1E-LEAD 6/26/2009 0.31 0.3 After Carbon Treatment Sample

LHWAPSD-BED2E-LAG 6/26/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample LHWAPSD

- BED1W

- LEAD 6/26/2009 0.098 0.094 Aft er C ar b on T rea t men t S amp l e



### 11/3/10 Page 18 of 48 Table 4.1

### Table 4.1 APFO and PFOA Results for Public Water Supply Sampling, West Virginia and Ohio Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Location Sample ID Sample Date A PFO (C-8) ug/ L PFOA ug/L* Comments Active Sampling Locations

LHWAPSD

- BED2W

- LAG 6/26/2009 ND(<0.0026 ) ND(<0.0026 ) Aft er C ar b on T rea t men t S amp l e LHWAPSD-PT 7/9/2009 6.7 6.4 Prior to Treatment Sample LHWAPSD-BED2E-LEAD 7/9/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample

LHWAPSD-BED1E-LAG 7/9/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample LHWAPSD-BED2W-LEAD 7/9/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample

LHWAPSD-BED1W-LAG 7/9/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample LHWAPSD-AT-CONTACT TANK 7/9/2009 ND(<0.0026 ) ND(<0.0026 ) GAC System Samples LHWAPSD-PT 7/23/2009 6.2 6 Prior to Treatment Sample LHWAPSD-BED2E-LEAD 7/23/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample

LHWAPSD-BED1E-LAG 7/23/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample LHWAPSD-BED2W-LEAD 7/23/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample

LHWAPSD-BED1W-LAG 7/23/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample LHWAPSD-PT 8/7/2009 7.6 7.3 Prior to Treatment Sample LHWAPSD-BED2E-LEAD 8/7/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample

LHWAPSD-BED1E-LAG 8/7/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample LHWAPSD-BED2W-LEAD 8/7/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample

LHWAPSD-BED1W-LAG 8/7/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample LHWAPSD-AT-CONTACT TANK 8/7/2009 ND(<0.0026 ) ND(<0.0026 ) GAC System Samples LHWAPSD-PT 8/21/2009 8.4 8.1 Prior to Treatment Sample LHWAPSD-BED2E-LEAD 8/21/2009 NQ (<0.013) NQ (<0.013) After Carbon Treatment Sample

LHWAPSD-BED1E-LAG 8/21/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample LHWAPSD-BED2W-LEAD 8/21/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample

LHWAPSD-BED1W-LAG 8/21/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample LHWAPSD-PT 9/4/2009 7.1 6.8 Prior to Treatment Sample LHWAPSD-BED2E-LEAD 9/4/2009 0.024 0.023 After Carbon Treatment Sample

LHWAPSD-BED1E-LAG 9/4/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample LHWAPSD-BED2W-LEAD 9/4/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample

LHWAPSD-BED1W-LAG 9/4/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample LHWAPSD-AT-CONTACT TANK 9/4/2009 ND(<0.0026 ) ND(<0.0026 ) GAC System Samples LHWAPSD-PT 9/18/2009 8.5 8.2 Prior to Treatment Sample LHWAPSD-BED2E-LEAD 9/18/2009 0.016 0.015 After Carbon Treatment Sample

LHWAPSD-BED1E-LAG 9/18/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample LHWAPSD-BED2W-LEAD 9/18/2009 0.05 0.048 After Carbon Treatment Sample

LHWAPSD-BED1W-LAG 9/18/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample LHWAPSD-PT 10/2/2009 5.8 5.6 Prior to Treatment Sample LHWAPSD-BED1E-LEAD 10/2/2009 ND(<0.0033 ) ND(<0.0033 ) After Carbon Treatment Sample

LHWAPSD-BED2E-LAG 10/2/2009 ND(<0.0033 ) ND(<0.0033 ) After Carbon Treatment Sample LHWAPSD-BED1W-LEAD 10/2/2009 ND(<0.0033 ) ND(<0.0033 ) After Carbon Treatment Sample

LHWAPSD-BED2W-LAG 10/2/2009 ND(<0.0033 ) ND(<0.0033 ) After Carbon Treatment Sample

LHWAPSD-AT-CONTACT TANK 10/2/2009 ND(<0.0033 ) ND(<0.0033 ) GAC System Samples LHWAPSD-PT 10/16/2009 6.9 6.6 Prior to Treatment Sample LHWAPSD-BED1E-LEAD 10/16/2009 ND(<0.0021 ) ND(<0.0021 ) After Carbon Treatment Sample

LHWAPSD-BED2E-LAG 10/16/2009 ND(<0.0021 ) ND(<0.0021 ) After Carbon Treatment Sample LHWAPSD-BED1W-LEAD 10/16/2009 ND(<0.0021 ) ND(<0.0021 ) After Carbon Treatment Sample

LHWAPSD-BED2W-LAG 10/16/2009 ND(<0.0021 ) ND(<0.0021 ) After Carbon Treatment Sample LHWAPSD-PT 10/30/2009 7.2 6.9 Prior to Treatment Sample LHWAPSD-BED1E-LEAD 10/30/2009 NQ (<0.016) NQ (<0.016) After Carbon Treatment Sample

LHWAPSD-BED2E-LAG 10/30/2009 ND(<0.0033 ) ND(<0.0033 ) After Carbon Treatment Sample LHWAPSD-BED1W-LEAD 10/30/2009 NQ (<0.016) NQ (<0.016) After Carbon Treatment Sample

LHWAPSD-BED2W-LAG 10/30/2009 ND(<0.0033 ) ND(<0.0033 ) After Carbon Treatment Sample LHWAPSD-AT-CONTACT TANK 10/30/2009 ND(<0.0033 ) ND(<0.0033 ) GAC System Samples LHWAPSD-PT 11/13/2009 7.6 7.3 Prior to Treatment Sample LHWAPSD-BED1E-LEAD 11/13/2009 0.16 0.15 After Carbon Treatment Sample

LHWAPSD

- BED2E

- LAG 11/13/2009 ND(<0.0033 ) ND(<0.0033 ) Aft er C ar b on T rea t men t S amp l e



### 11/3/10 Page 19 of 48 Table 4.1

### Table 4.1 APFO and PFOA Results for Public Water Supply Sampling, West Virginia and Ohio Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Location Sample ID Sample Date A PFO (C-8) ug/ L PFOA ug/L* Comments Active Sampling Locations

LHWAPSD-BED1W-LEAD 11/13/2009 0.038 0.036 After Carbon Treatment Sample

LHWAPSD-BED2W-LAG 11/13/2009 ND(<0.0033 ) ND(<0.0033 ) After Carbon Treatment Sample LHWAPSD-PT 11/30/2009 7.2 6.9 Prior to Treatment Sample LHWAPSD-BED1E-LEAD 11/30/2009 0.33 0.32 After Carbon Treatment Sample

LHWAPSD-BED2E-LAG 11/30/2009 ND(<0.0033 ) ND(<0.0033 ) After Carbon Treatment Sample LHWAPSD-BED1W-LEAD 11/30/2009 0.074 0.071 After Carbon Treatment Sample

LHWAPSD-BED2W-LAG 11/30/2009 ND(<0.0033 ) ND(<0.0033 ) After Carbon Treatment Sample LHWAPSD-AT-CONTACT TANK 11/30/2009 ND(<0.0033 ) ND(<0.0033 ) GAC System Samples WWO-D-LHWAPSD-PT 12/11/2009 7 6.7 Prior to Treatment Sample LHWAPSD-BED2E-LEAD 12/11/2009 ND(<0.0021 ) ND(<0.0021 ) After Carbon Treatment Sample

LHWAPSD-BED1E-LAG 12/11/2009 ND(<0.0021 ) ND(<0.0021 ) After Carbon Treatment Sample LHWAPSD-BED2W-LEAD 12/11/2009 ND(<0.0021 ) ND(<0.0021 ) After Carbon Treatment Sample

LHWAPSD-BED1W-LAG 12/11/2009 ND(<0.0021 ) ND(<0.0021 ) After Carbon Treatment Sample LHWAPSD-PT 12/28/2009 5.2 5 Prior to Treatment Sample LHWAPSD-BED2E-LEAD 12/28/2009 ND(<0.0033 ) ND(<0.0033 ) After Carbon Treatment Sample

LHWAPSD-BED1E-LAG 12/28/2009 ND(<0.0033 ) ND(<0.0033 ) After Carbon Treatment Sample LHWAPSD-BED2W-LEAD 12/28/2009 ND(<0.0033 ) ND(<0.0033 ) After Carbon Treatment Sample

LHWAPSD-BED1W-LAG 12/28/2009 ND(<0.0033 ) ND(<0.0033 ) After Carbon Treatment Sample LHWAPSD-AT-CONTACT TANK 12/28/2009 ND(<0.0033 ) ND(<0.0033 ) GAC System Samples LHWAPSD-PT 1/8/2010 7.3 7 Prior to Treatment Sample LHWAPSD-BED2E-LEAD 1/8/2010 0.023 0.022 After Carbon Treatment Sample

LHWAPSD-BED1E-LAG 1/8/2010 ND(<0.0019 ) ND(<0.0019 ) After Carbon Treatment Sample LHWAPSD-BED2W-LEAD 1/8/2010 0.01 0.0098 After Carbon Treatment Sample

LHWAPSD-BED1W-LAG 1/8/2010 ND(<0.0019 ) ND(<0.0019 ) After Carbon Treatment Sample LHWAPSD-PT 1/22/2010 5.8 5.6 Prior to Treatment Sample LHWAPSD-BED2E-LEAD 1/22/2010 NQ (<0.018) NQ (<0.018) After Carbon Treatment Sample

LHWAPSD-BED1E-LAG 1/22/2010 ND(<0.0035 ) ND(<0.0035 ) After Carbon Treatment Sample LHWAPSD-BED2W-LEAD 1/22/2010 NQ (<0.018) NQ (<0.018) After Carbon Treatment Sample

LHWAPSD-BED1W-LAG 1/22/2010 ND(<0.0035 ) ND(<0.0035 ) After Carbon Treatment Sample LHWAPSD-AT-CONTACT TANK 1/22/2010 ND(<0.0035 ) ND(<0.0035 ) GAC System Samples LHWAPSD-PT 2/5/2010 6 5.8 Prior to Treatment Sample LHWAPSD-BED1E-LEAD 2/5/2010 ND(<0.0035 ) ND(<0.0035 ) After Carbon Treatment Sample

LHWAPSD-BED2E-LAG 2/5/2010 ND(<0.0035 ) ND(<0.0035 ) After Carbon Treatment Sample LHWAPSD-BED1W-LEAD 2/5/2010 ND(<0.0035 ) ND(<0.0035 ) After Carbon Treatment Sample

LHWAPSD-BED2W-LAG 2/5/2010 ND(<0.0035 ) ND(<0.0035 ) After Carbon Treatment Sample LHWAPSD-PT 2/19/2010 6.9 6.6 Prior to Treatment Sample LHWAPSD-BED1E-LEAD 2/19/2010 ND(<0.0035 ) ND(<0.0035 ) After Carbon Treatment Sample

LHWAPSD-BED2E-LAG 2/19/2010 ND(<0.0035 ) ND(<0.0035 ) After Carbon Treatment Sample LHWAPSD-BED1W-LEAD 2/19/2010 ND(<0.0035 ) ND(<0.0035 ) After Carbon Treatment Sample

LHWAPSD-BED2W-LAG 2/19/2010 ND(<0.0035 ) ND(<0.0035 ) After Carbon Treatment Sample LHWAPSD-AT-CONTACT TANK 2/19/2010 ND(<0.0035 ) ND(<0.0035 ) GAC System Samples LHWAPSD-PT 3/5/2010 6.9 6.6 Prior to Treatment Sample LHWAPSD-BED1E-LEAD 3/5/2010 ND(<0.0035 ) ND(<0.0035 ) After Carbon Treatment Sample

LHWAPSD-BED2E-LAG 3/5/2010 ND(<0.0035 ) ND(<0.0035 ) After Carbon Treatment Sample LHWAPSD-BED1W-LEAD 3/5/2010 ND(<0.0035 ) ND(<0.0035 ) After Carbon Treatment Sample

LHWAPSD-BED2W-LAG 3/5/2010 ND(<0.0035 ) ND(<0.0035 ) After Carbon Treatment Sample LHWAPSD-PT 3/19/2010 6.7 6.4 Prior to Treatment Sample LHWAPSD-BED1E-LEAD 3/19/2010 NQ (<0.018) NQ (<0.018) After Carbon Treatment Sample

LHWAPSD-BED2E-LAG 3/19/2010 NQ (<0.018) NQ (<0.018) After Carbon Treatment Sample LHWAPSD-BED1W-LEAD 3/19/2010 ND(<0.0035 ) ND(<0.0035 ) After Carbon Treatment Sample

LHWAPSD-BED2W-LAG 3/19/2010 ND(<0.0035 ) ND(<0.0035 ) After Carbon Treatment Sample

LHWAPSD-AT-CONTACT TANK 3/19/2010 ND(<0.0035 ) ND(<0.0035 ) GAC System Samples LHWAPSD-PT 4/2/2010 2.9 2.8 Prior to Treatment Sample LHWAP S D-BED 1 E-LEAD 4/2/2010 NQ (<0.019) NQ (<0.019) A f ter C arbon Treatment S ample



### 11/3/10 Page 20 of 48 Table 4.1

### Table 4.1 APFO and PFOA Results for Public Water Supply Sampling, West Virginia and Ohio Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Location Sample ID Sample Date A PFO (C-8) ug/ L PFOA ug/L* Comments Active Sampling Locations

LHWAPSD-BED2E-LAG 4/2/2010 ND(<0.0038 ) ND(<0.0038 ) After Carbon Treatment Sample LHWAPSD-BED1W-LEAD 4/2/2010 ND(<0.0038 ) ND(<0.0038 ) After Carbon Treatment Sample

LHWAPSD-BED2W-LAG 4/2/2010 ND(<0.0038 ) ND(<0.0038 ) After Carbon Treatment Sample LHWAPSD-AT-CONTACT TANK 4/2/2010 ND(<0.0038 ) ND(<0.0038 ) GAC System Samples LHWAPSD-PT 4/16/2010 6.4 6.1 Prior to Treatment Sample LHWAPSD-BED1E-LEAD 4/16/2010 0.051 0.049 After Carbon Treatment Sample

LHWAPSD-BED2E-LAG 4/16/2010 ND(<0.0038 ) ND(<0.0038 ) After Carbon Treatment Sample LHWAPSD-BED1W-LEAD 4/16/2010 0.033 0.032 After Carbon Treatment Sample

LHWAPSD-BED2W-LAG 4/16/2010 ND(<0.0038 ) ND(<0.0038 ) After Carbon Treatment Sample LHWAPSD-AT-CONTACT TANK 4/16/2010 ND(<0.0038 ) ND(<0.0038 ) GAC System Samples LHWAPSD-PT 4/30/2010 6.4 6.1 Prior to Treatment Sample LHWAPSD-BED1E-LEAD 4/30/2010 ND(<0.0038 ) ND(<0.0038 ) After Carbon Treatment Sample

LHWAPSD-BED2E-LAG 4/30/2010 ND(<0.0038 ) ND(<0.0038 ) After Carbon Treatment Sample LHWAPSD-BED1W-LEAD 4/30/2010 ND(<0.0038 ) ND(<0.0038 ) After Carbon Treatment Sample

LHWAPSD-BED2W-LAG 4/30/2010 ND(<0.0038 ) ND(<0.0038 ) After Carbon Treatment Sample LHWAPSD-PT 5/14/2010 6 5.8 Prior to Treatment Sample LHWAPSD-BED1E-LEAD 5/14/2010 ND(<0.0038 ) ND(<0.0038 ) After Carbon Treatment Sample

LHWAPSD-BED2E-LAG 5/14/2010 ND(<0.0038 ) ND(<0.0038 ) After Carbon Treatment Sample LHWAPSD-BED1W-LEAD 5/14/2010 ND(<0.0038 ) ND(<0.0038 ) After Carbon Treatment Sample

LHWAPSD-BED2W-LAG 5/14/2010 ND(<0.0038 ) ND(<0.0038 ) After Carbon Treatment Sample LHWAPSD-AT-CONTACT TANK 5/14/2010 ND(<0.0038 ) ND(<0.0038 ) GAC System Samples LHWAPSD-PT 5/28/2010 7.5 7.2 Prior to Treatment Sample LHWAPSD-BED1E-LAG 5/28/2010 ND(<0.0038 ) ND(<0.0038 ) After Carbon Treatment Sample LHWAPSD-BED2E-LEAD 5/28/2010 0.026 0.025 After Carbon Treatment Sample LHWAPSD-BED1W-LAG 5/28/2010 ND(<0.0038 ) ND(<0.0038 ) After Carbon Treatment Sample LHWAPSD-BED2W-LEAD 5/28/2010 ND(<0.0038 ) ND(<0.0038 ) After Carbon Treatment Sample LHWAPSD-PT 6/11/2010 6.7 6.4 Prior to Treatment Sample LHWAPSD-BED1E-LAG 6/11/2010 ND(<0.0038 ) ND(<0.0038 ) After Carbon Treatment Sample LHWAPSD-BED2E-LEAD 6/11/2010 NQ (<0.019) NQ (<0.019) After Carbon Treatment Sample LHWAPSD-BED1W-LAG 6/11/2010 ND(<0.0038 ) ND(<0.0038 ) After Carbon Treatment Sample LHWAPSD-BED2W-LEAD 6/11/2010 0.055 0.053 After Carbon Treatment Sample LHWAPSD-AT-CONTACT TANK 6/11/2010 ND(<0.0038 ) ND(<0.0038 ) GAC System Samples LHWAPSD-PT 6/25/2010 6.9 6.6 Prior to Treatment Sample LHWAPSD-BED1E-LEAD 6/25/2010 ND(<0.0038 ) ND(<0.0038 ) After Carbon Treatment Sample

LHWAPSD-BED2E-LAG 6/25/2010 ND(<0.0038 ) ND(<0.0038 ) After Carbon Treatment Sample LHWAPSD-BED1W-LEAD 6/25/2010 ND(<0.0038 ) ND(<0.0038 ) After Carbon Treatment Sample

LHWAPSD-BED2W-LAG 6/25/2010 ND(<0.0038 ) ND(<0.0038 ) After Carbon Treatment Sample LHWAPSD-PT 7/9/2010 5.3 5.1 Prior to Treatment Sample LHWAPSD-BED1E-LEAD 7/9/2010 ND(<0.0025 ) ND(<0.0025 ) After Carbon Treatment Sample

LHWAPSD-BED2E-LAG 7/9/2010 ND(<0.0025 ) ND(<0.0025 ) After Carbon Treatment Sample LHWAPSD-BED1W-LEAD 7/9/2010 ND(<0.0025 ) ND(<0.0025 ) After Carbon Treatment Sample

LHWAPSD-BED2W-LAG 7/9/2010 ND(<0.0025 ) ND(<0.0025 ) After Carbon Treatment Sample LHWAPSD-AT-CONTACT TANK 7/9/2010 ND(<0.0025 ) ND(<0.0025 ) GAC System Samples LHWAPSD-PT 7/23/2010 6.8 6.5 Prior to Treatment Sample LHWAPSD-BED1E-LEAD 7/23/2010 ND(<0.0025 ) ND(<0.0025 ) After Carbon Treatment Sample

LHWAPSD-BED2E-LAG 7/23/2010 ND(<0.0025 ) ND(<0.0025 ) After Carbon Treatment Sample LHWAPSD-BED1W-LEAD 7/23/2010 0.017 0.016 After Carbon Treatment Sample

LHWAPSD-BED2W-LAG 7/23/2010 ND(<0.0025 ) ND(<0.0025 ) After Carbon Treatment Sample LHWAPSD-PT 8/6/2010 7.8 7.5 Prior to Treatment Sample LHWAPSD-BED1E-LEAD 8/6/2010 0.019 0.018 After Carbon Treatment Sample

LHWAPSD-BED2E-LAG 8/6/2010 ND(<0.0025 ) ND(<0.0025 ) After Carbon Treatment Sample LHWAPSD-BED1W-LEAD 8/6/2010 NQ (<0.012) NQ (<0.012) After Carbon Treatment Sample

LHWAPSD-BED2W-LAG 8/6/2010 ND(<0.0025 ) ND(<0.0025 ) A f ter C arbon Treatment S ample



### 11/3/10 Page 21 of 48 Table 4.1

### Table 4.1 APFO and PFOA Results for Public Water Supply Sampling, West Virginia and Ohio Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Location Sample ID Sample Date A PFO (C-8) ug/ L PFOA ug/L* Comments Active Sampling Locations

LHWAPSD-AT-CONTACT TANK 8/6/2010 ND(<0.0025 ) ND(<0.0025 ) GAC System Samples LHWAPSD-PT 8/20/2010 6.6 6.3 Prior to Treatment Sample LHWAPSD-BED2E-LEAD 8/20/2010 ND(<0.0025 ) ND(<0.0025 ) After Carbon Treatment Sample

LHWAPSD-BED1E-LAG 8/20/2010 ND(<0.0025 ) ND(<0.0025 ) After Carbon Treatment Sample LHWAPSD-BED2W-LEAD 8/20/2010 ND(<0.0025 ) ND(<0.0025 ) After Carbon Treatment Sample

LHWAPSD-BED1W-LAG 8/20/2010 ND(<0.0025 ) ND(<0.0025 ) After Carbon Treatment Sample LHWAPSD-PT 9/7/2010 7.3 7 Prior to Treatment Sample LHWAPSD-BED2E-LEAD 9/7/2010 ND(<0.0025 ) ND(<0.0025 ) After Carbon Treatment Sample

LHWAPSD-BED1E-LAG 9/7/2010 ND(<0.0025 ) ND(<0.0025 ) After Carbon Treatment Sample LHWAPSD-BED2W-LEAD 9/7/2010 ND(<0.0025 ) ND(<0.0025 ) After Carbon Treatment Sample

LHWAPSD-BED1W-LAG 9/7/2010 ND(<0.0025 ) ND(<0.0025 ) After Carbon Treatment Sample LHWAPSD-AT-CONTACT TANK 9/7/2010 ND(<0.0025 ) ND(<0.0025 ) GAC System Samples LHWAPSD-PT 9/17/2010 8.1 7.8 Prior to Treatment Sample LHWAPSD-BED2E-LEAD 9/17/2010 ND(<0.0025 ) ND(<0.0025 ) After Carbon Treatment Sample

LHWAPSD-BED1E-LAG 9/17/2010 ND(<0.0025 ) ND(<0.0025 ) After Carbon Treatment Sample LHWAPSD-BED2W-LEAD 9/17/2010 NQ (<0.012) NQ (<0.012) After Carbon Treatment Sample

LHWAPSD-BED1W-LAG 9/17/2010 ND(<0.0025 ) ND(<0.0025 ) After Carbon Treatment Sample DuPont Washington Works, AM07-PW01 12/20/1991 0.4 0.4 Production Well (Drinking Water) WV & AM07-PW01 4/2/1996 0.48 Production Well (Drinking Water) AM07-PW01 6/2/1997 0.79 Production Well (Drinking Water) AM07-PW01 6/19/1998 0.4 Production Well (Drinking Water) AM07-PW01 11/18/1998 1.9 L Production Well (Drinking Water) AM07-PW01 2/3/1999 0.082 B Production Well (Drinking Water) AM07-PW01 5/12/1999 0.578 Production Well (Drinking Water) AM07-PW01 8/16/2000 0.071 J Production Well (Drinking Water) AM07-PW01 11/20/2000 0.24 Production Well (Drinking Water) AM07-PW01 1/22/2002 0.131 Production Well (Drinking Water) AM07-PW01 2/14/2002 0.129 Production Well (Drinking Water) AM07-PW01 3/21/2002 0.171 Production Well (Drinking Water) AM07-PW01 4/16/2002 0.159 Production Well (Drinking Water) AM07-PW01 5/17/2002 0.247 Production Well (Drinking Water) AM07-PW01 8/26/2002 0.335 Production Well (Drinking Water) AM07-PW01 10/22/2002 0.269 Production Well (Drinking Water) AM07-PW01 3/8/2003 NQ (< 0.05) Production Well (Drinking Water) AM07-PW01 5/22/2003 0.377 Production Well (Drinking Water) AM07-PW01 8/11/2003 1.16 Production Well (Drinking Water) AM07-PW01 11/11/2003 0.511 Production Well (Drinking Water) AM07-PW01 2/17/2004 1.04 Production Well (Drinking Water) AM07-PW01 5/11/2004 1.27 Production Well (Drinking Water) AM07-PW01 9/26/2004 9.06 Production Well (Drinking Water) AM07-PW01 12/7/2004 2.61 2.51 Production Well (Drinking Water) AM07-PW01 3/21/2005 1.31 1.26 Production Well (Drinking Water) AM07-PW01 6/24/2005 0.967 0.929 Production Well (Drinking Water) AM07-PW01 9/29/2005 1 0.962 Production Well (Drinking Water) AM07-PW01 12/19/2005 0.559 0.537 Production Well (Drinking Water) AM07-PW01 3/7/2006 0.637 0.612 Production Well (Drinking Water) AM07-PW01 6/6/2006 0.538 0.517 Production Well (Drinking Water) AO08-PW01 4/2/1996 0.52 Production Well (Drinking Water) AO08-PW01 6/2/1997 0.55 Production Well (Drinking Water) AO08-PW01 6/19/1998 1 Production Well (Drinking Water) AO08-PW01 5/12/1999 0.307 Production Well (Drinking Water) AO08-PW01 8/15/2000 0.167 Production Well (Drinking Water) AO08-PW01 11/20/2000 0.4 Production Well (Drinking Water) AO08-PW01 11/20/00 (dup) 0.26 Production Well (Drinking Water) AO08-PW01 1/22/2002 0.355 Production Well (Drinking Water) AO08-PW01 2/14/2002 0.439 Production Well (Drinking Water) AO08-PW01 3/21/2002 0.568 Production Well (Drinking Water)



### 11/3/10 Page 22 of 48 Table 4.1

### Table 4.1 APFO and PFOA Results for Public Water Supply Sampling, West Virginia and Ohio Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Location Sample ID Sample Date A PFO (C-8) ug/ L PFOA ug/L* Comments Active Sampling Locations

AO08-PW01 4/16/2002 0.497 Production Well (Drinking Water) AO08-PW01 5/17/2002 0.499 Production Well (Drinking Water) AO08-PW01 8/26/2002 0.42 Production Well (Drinking Water) AO08-PW01 10/22/2002 0.415 Production Well (Drinking Water) AO08-PW01 3/8/2003 0.308 Production Well (Drinking Water) AO08-PW01 5/22/2003 0.736 Production Well (Drinking Water) AO08-PW01 8/11/2003 0.802 Production Well (Drinking Water) AO08-PW01 11/11/2003 0.384 Production Well (Drinking Water) AO08-PW01 2/17/2004 0.928 Production Well (Drinking Water) AO08-PW01 5/11/2004 1.01 Production Well (Drinking Water) AO08-PW01 9/26/2004 4.99 Production Well (Drinking Water) AO08-PW01 12/7/2004 2.12 2.04 Production Well (Drinking Water) AO08-PW01 3/21/2005 1.29 1.24 Production Well (Drinking Water) AO08-PW01 6/24/2005 1.09 1.05 Production Well (Drinking Water) AO08-PW01 9/29/2005 1.25 1.2 Production Well (Drinking Water) AO08-PW01 12/19/2005 0.86 0.826 Production Well (Drinking Water) AO08-PW01 3/7/2006 1.47 1.41 Production Well (Drinking Water) AO08-PW01 6/6/2006 0.969 0.931 Production Well (Drinking Water) WWK-Z-GAC-PT 5/22/2007 0.5 0.48 Prior to GAC Treatment Sample WWK-Z-GAC-IT 5/22/2007 NQ (<0.013) NQ (<0.013) Intermediate GAC Treatment Sample WWK-Z-GAC-AT 5/22/2007 ND (<0.0027) ND (<0.0027) After GAC Treatment Sample WWK-Z-GAC-PT 6/13/2007 0.51 0.49 Prior to GAC Treatment Sample WWK-Z-GAC-IT 6/13/2007 0.15 0.14 Intermediate GAC Treatment Sample WWK-Z-GAC-AT 6/13/2007 ND (<0.0027) ND (<0.0027) After GAC Treatment Sample WWK-Z-GAC-PT 7/24/2007 0.62 0.6 Prior to GAC Treatment Sample WWK-Z-GAC-IT 7/24/2007 0.24 0.23 Intermediate GAC Treatment Sample WWK-Z-GAC-AT 7/24/2007 ND (<0.0012) ND (<0.0012) After GAC Treatment Sample WWK-Z-GAC-PT 8/21/2007 0.57 0.55 Prior to GAC Treatment Sample WWK-Z-GAC-IT 8/21/2007 0.23 0.22 Intermediate GAC Treatment Sample WWK-Z-GAC-AT 8/21/2007 NQ (<0.0062) NQ (<0.0062) After GAC Treatment Sample WWK-Z-GAC-PT 9/11/2007 0.8 0.77 Prior to GAC Treatment Sample WWK-Z-GAC-IT 9/11/2007 0.42 0.4 Intermediate GAC Treatment Sample WWK-Z-GAC-AT 9/11/2007 0.021 0.02 After GAC Treatment Sample WWK-Z-GAC-PT 10/30/2007 0.29 0.28 Prior to GAC Treatment Sample WWK-Z-GAC-IT 10/30/2007 0.091 0.087 Intermediate GAC Treatment Sample WWK-Z-GAC-AT 10/30/2007 NQ (<0.016) NQ (<0.016) After GAC Treatment Sample WWK-Z-GAC-PT 11/13/2007 0.36 0.35 Prior to GAC Treatment Sample WWK-Z-GAC-IT 11/13/2007 0.095 0.091 Intermediate GAC Treatment Sample WWK-Z-GAC-AT 11/13/2007 NQ (<0.016) NQ (<0.016) After GAC Treatment Sample WWK-Z-GAC-PT 12/18/2007 0.35 0.34 Prior to GAC Treatment Sample WWK-Z-GAC-IT 12/18/2007 0.1 0.1 Intermediate GAC Treatment Sample WWK-Z-GAC-AT 12/18/2007 NQ (<0.016) NQ (<0.016) After GAC Treatment Sample WWK-Z-GAC-PT 1/8/2008 0.42 0.4 Prior to GAC Treatment Sample WWK-Z-GAC-IT 1/8/2008 0.071 0.068 Intermediate GAC Treatment Sample WWK-Z-GAC-AT 1/8/2008 ND (<0.0022) ND (<0.0022) After GAC Treatment Sample WWK-Z-GAC-PT 2/5/2008 0.51 0.49 Prior to GAC Treatment Sample WWK-Z-GAC-IT 2/5/2008 0.12 0.12 Intermediate GAC Treatment Sample WWK-Z-GAC-AT 2/5/2008 ND (<0.0022) ND (<0.0022) After GAC Treatment Sample WWK-Z-GAC-PT 3/4/2008 0.46 0.44 Prior to GAC Treatment Sample WWK-Z-GAC-IT 3/4/2008 0.15 0.14 Intermediate GAC Treatment Sample WWK-Z-GAC-AT 3/4/2008 NQ (<0.011) NQ (<0.011) After GAC Treatment Sample WWK-Z-GAC-PT 4/1/2008 0.35 0.34 Prior to GAC Treatment Sample WWK-Z-GAC-IT 4/1/2008 0.12 0.12 Intermediate GAC Treatment Sample WWK-Z-GAC-AT 4/1/2008 NQ (<0.0096) NQ (<0.0096) After GAC Treatment Sample WWK-Z-GAC-PT 5/6/2008 0.36 0.35 Prior to GAC Treatment Sample WWK-Z-GAC-IT 5/6/2008 0.18 0.17 Intermediate GAC Treatment Sample WWK-Z-GAC-AT 5/6/2008 0.04 0.038 After GAC Treatment Sample WWK-Z-GAC-PT 6/24/2008 0.49 0.47 Prior to GAC Treatment Sample WWK-Z- G A C -IT 6/24/2008 0

. 18 0

. 1 7 Intermediate GAC Treatment Sample



### 11/3/10 Page 23 of 48 Table 4.1

### Table 4.1 APFO and PFOA Results for Public Water Supply Sampling, West Virginia and Ohio Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Location Sample ID Sample Date A PFO (C-8) ug/ L PFOA ug/L* Comments Active Sampling Locations

WWK-Z-GAC-AT 6/24/2008 NQ (<0.012) NQ (<0.012) After GAC Treatment Sample WWK-Z-GAC-PT 7/16/2008 0.54 0.52 Prior to GAC Treatment Sample WWK-Z-GAC-IT 7/16/2008 0.28 0.27 Intermediate GAC Treatment Sample WWK-Z-GAC-AT 7/16/2008 0.023 0.023 After GAC Treatment Sample WWK-Z-GAC-PT 8/13/2008 0.57 0.55 Prior to GAC Treatment Sample WWK-Z-GAC-IT 8/13/2008 0.28 0.27 Intermediate GAC Treatment Sample WWK-Z-GAC-AT 8/13/2008 0.041 0.039 After GAC Treatment Sample WWK-Z-GAC-PT 9/23/2008 0.56 0.54 Prior to GAC Treatment Sample WWK-Z-GAC-IT 9/23/2008 0.14 0.13 Intermediate GAC Treatment Sample WWK-Z-GAC-AT 9/23/2008 ND (<0.0023) ND (<0.0023) After GAC Treatment Sample WWK-Z-PT 10/24/2008 0.57 0.55 Prior to GAC Treatment Sample WWK-Z-PV1-LAG 10/24/2008 NQ (<0.0085) NQ (<0.0085) After GAC Treatment Sample WWK-Z-PV2-LEAD 10/24/2008 0.17 0.16 Intermediate GAC Treatment Sample WWK-Z-PT 11/14/2008 0.53 0.51 Prior to GAC Treatment Sample WWK-Z-PV1-LAG 11/14/2008 0.01 0.01 After GAC Treatment Sample WWK-Z-PV2-LEAD 11/14/2008 0.18 0.17 Intermediate GAC Treatment Sample WWK-Z-PT 12/30/2008 0.2 0.19 Prior to GAC Treatment Sample WWK-Z-PV1-LEAD 12/30/2008 0.037 0.036 Intermediate GAC Treatment Sample

WWK-Z-PV2-LAG 12/30/2008 <0.0026 <0.0026 After GAC Treatment Sample WWK-Z-PT 1/21/2009 0.55 0.53 Prior to GAC Treatment Sample WWK-Z-PV1-LEAD 1/21/2009 0.14 0.13 Intermediate GAC Treatment Sample

WWK-Z-PV2-LAG 1/21/2009 NQ (<0.013) NQ (<0.013) After GAC Treatment Sample WWK-Z-PT 2/28/2009 0.4 0.38 Prior to GAC Treatment Sample WWK-Z-PV1-LAG 2/28/2009 <0.0026 <0.0026 After GAC Treatment Sample WWK-Z-PV2-LEAD 2/28/2009 0.044 0.042 Intermediate GAC Treatment Sample WWK-Z-PT 3/25/2009 0.45 0.43 Prior to GAC Treatment Sample WWK-Z-PV2-LEAD 3/25/2009 0.097 0.094 Intermediate GAC Treatment Sample

WWK-Z-PV1-LAG 3/25/2009 NQ (<0.013) NQ (<0.013) After GAC Treatment Sample WWK-Z-PT 4/23/2009 0.3 0.29 Prior to GAC Treatment Sample WWK-Z-PV2-LEAD 4/23/2009 0.11 0.11 Intermediate GAC Treatment Sample

WWK-Z-PV1-LAG 4/23/2009 NQ (<0.013) NQ (<0.013) After GAC Treatment Sample WWK-Z-PT 5/14/2009 0.42 0.4 Prior to GAC Treatment Sample WWK-Z-PV1-LEAD 5/14/2009 0.075 0.072 Intermediate GAC Treatment Sample

WWK-Z-PV2-LAG 5/14/2009 <0.0026 <0.0026 After GAC Treatment Sample WWK-Z-PT 6/23/2009 0.54 0.52 Prior to GAC Treatment Sample WWK-Z-PV1-LEAD 6/23/2009 0.18 0.17 Intermediate GAC Treatment Sample

WWK-Z-PV2-LAG 6/23/2009 NQ NQ After GAC Treatment Sample WWK-Z-PT 7/24/2009 0.6 0.58 Prior to GAC Treatment Sample WWK-Z-PV1-LAG 7/24/2009 <0.0026 <0.0026 Intermediate GAC Treatment Sample WWK-Z-PV2-LEAD 7/24/2009 0.074 0.071 After GAC Treatment Sample WWK-Z-PT 8/19/2009 0.62 0.6 Prior to GAC Treatment Sample WWK-Z-PV1-LAG 8/19/2009 NQ NQ Intermediate GAC Treatment Sample WWK-Z-PV2-LEAD 8/19/2009 0.18 0.17 After GAC Treatment Sample WWK-Z-PT 9/17/2009 0.68 0.65 Prior to GAC Treatment Sample WWK-Z-PV1-LEAD 9/17/2009 0.031 0.03 Intermediate GAC Treatment Sample

WWK-Z-PV2-LAG 9/17/2009 <0.0026 <0.0026 After GAC Treatment Sample WWK-Z-PT 10/27/2009 0.74 0.71 Prior to GAC Treatment Sample WWK-Z-PV1-LEAD 10/27/2009 0.099 0.095 Intermediate GAC Treatment Sample

WWK-Z-PV2-LAG 10/27/2009 <0.0033 <0.0033 After to GAC Treatment Sample WWK-Z-PT 11/19/2009 0.8 0.77 Prior to GAC Treatment Sample WWK-Z-PV1-LEAD 11/19/2009 0.15 0.14 Intermediate GAC Treatment Sample

WWK-Z-PV2-LAG 11/19/2009 <0.0033 <0.0033 After to GAC Treatment Sample WWK-Z-PT 12/14/2009 0.62 0.6 Prior to GAC Treatment Sample WWK-Z-PV1-LEAD 12/14/2009 0.17 0.16 Intermediate GAC Treatment Sample

WWK-Z-PV2-LAG 12/14/2009 <0.0021 <0.0021 After to GAC Treatment Sample WWK-Z-PT 1/20/2010 0.54 0.52 Prior to Treatment Sample WWK

- Z

- PV1

- LEAD 1/20/2010 0.17 0.16 I n t erme di a t e C ar b on T rea t men t S amp l e

WWK-Z-PV2-LAG 1/20/2010 NQ NQ After Carbon Treatment Sample WWK-Z-PT 2/18/2010 0.55 0.53 Prior to Treatment Sample WWK-Z-PV 1 -LA G 2/18/2010 <0.0035 <0.0035 A f ter C arbon Treatment S ample



### 11/3/10 Page 24 of 48 Table 4.1

### Table 4.1 APFO and PFOA Results for Public Water Supply Sampling, West Virginia and Ohio Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Location Sample ID Sample Date A PFO (C-8) ug/ L PFOA ug/L* Comments Active Sampling Locations

WWK-Z-PV2-LEAD 2/18/2010 0.047 0.045 Intermediate Carbon Treatment Sample WWK-Z-PT 3/22/2010 0.44 0.42 Prior to GAC Treatment Sample WWK-Z-PV2-LEAD 3/22/2010 0.07 0.067 Intermediate GAC Treatment Sample

WWK-Z-PV1-LAG 3/22/2010 <0.0035 <0.0035 After GAC Treatment Sample WWK-Z-PT 4/27/2010 0.44 0.42 Prior to GAC Treatment Sample WWK-Z-PV2-LEAD 4/27/2010 0.1 0.1 Intermediate GAC Treatment Sample

WWK-Z-PV1-LAG 4/27/2010 NQ (<0.019) NQ (<0.019) After GAC Treatment Sample WWK-Z-PT 5/26/2010 0.5 0.48 Prior to GAC Treatment Sample WWK-Z-PV1-LEAD 5/26/2010 0.037 0.036 Intermediate GAC Treatment Sample

WWK-Z-PV2-LAG 5/26/2010 <0.0038 <0.0038 After GAC Treatment Sample WWK-Z-PT 6/22/2010 0.58 0.56 Prior to GAC Treatment Sample WWK-Z-PV1-LEAD 6/22/2010 0.1 0.098 Intermediate GAC Treatment Sample

WWK-Z-PV2-LAG 6/22/2010 <0.0038 <0.0038 After GAC Treatment Sample WWK-Z-PT 7/20/2010 0.51 0.49 Prior to GAC Treatment Sample WWK-Z-PV1-LEAD 7/20/2010 0.15 0.14 Intermediate GAC Treatment Sample

WWK-Z-PV2-LAG 7/20/2010 NQ NQ After GAC Treatment Sample WWK-Z-PT 8/20/2010 0.68 0.65 Prior to GAC Treatment Sample WWK-Z-PV2-LEAD 8/20/2010 0.079 0.076 Intermediate GAC Treatment Sample

WWK-Z-PV1-LAG 8/20/2010 ND(<0.0025 ) ND(<0.0025 ) After GAC Treatment Sample Lubeck, WV LPSDAT 3/28/2002 0.690 After Treatment Sample LPSDAT 4/26/2002 0.652 After Treatment Sample LPSDAT 7/24/2002 0.600 After Treatment Sample LPSDAT 10/15/2002 0.653 After Treatment Sample LPSDAT 2/25/2003 0.565 After Treatment Sample LPSDAT 5/27/2003 0.539 After Treatment Sample LPSDAT 8/28/2003 0.425 After Treatment Sample LPSDAT 12/17/2003 0.444 After Treatment Sample LPSDAT 2/24/2004 0.487 After Treatment Sample LPSDAT 5/28/2004 0.521 After Treatment Sample LPSDAT 10/1/2004 0.821 After Treatment Sample LPSDAT 10/1/2004 (dup) 0.783 duplicate LPSDAT 11/29/2004 1.150 1.100 After Treatment Sample LPSDAT 11/29/04 (dup) 1.020 0.983 duplicate LPSDAT 1/21/2005 0.623 0.598 After Treatment Sample LPSDAT 1/21/05 (dup) 0.618 0.594 After Treatment Sample LPSDAT 5/18/2005 0.650 0.624 After Treatment Sample LPSDAT 7/12/2005 0.523 0.502 After Treatment Sample LPSDAT 7/12/2005 (dup) 0.484 0.465 duplicate LPSDAT 10/17/2005 0.733 0.704 After Treatment Sample LPSDAT 2/10/2006 0.466 0.448 After Treatment Sample LPSDAT 5/4/2006 0.803 0.771 After Treatment Sample LPSDAT 8/22/2006 0.500 0.480 After Treatment Sample LPSDAT 7/20/2007 ND (<0.0012) ND (<0.0012) After Treatment Sample LPSD WELL A 1/3/2002 0.764 Production Well LPSD WELL A 2/21/2002 0.683 Production Well LPSD WELL A 3/28/2002 0.796 Production Well LPSD WELL A 4/26/2002 0.938 Production Well LPSD WELL A 7/24/2002 0.753 Production Well LPSD WELL A 10/15/2002 0.856 Production Well LPSD WELL A 2/25/2003 0.777 Production Well LPSD WELL A 5/27/2003 0.746 Production Well LPSD WELL A 8/28/2003 0.470 Production Well LPSD WELL A 12/17/2003 0.466 Production Well LPSD WELL A 2/24/2004 0.397 Production Well LPSD WELL A 2/24/2004 0.473 Production Well LPSD WELL A 5/28/2004 0.450 Production Well LPSD WELL A 5/28/2004 0.453 duplicate LPSD WELL A 10/1/2004 0.848 Production Well LP S D WELL A 11/29/2004 1.190 1.140 Production Well



### 11/3/10 Page 25 of 48 Table 4.1

### Table 4.1 APFO and PFOA Results for Public Water Supply Sampling, West Virginia and Ohio Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Location Sample ID Sample Date A PFO (C-8) ug/ L PFOA ug/L* Comments Active Sampling Locations

LPSD WELL A 1/21/2005 0.613 0.589 Production Well LPSD WELL A 5/18/2005 0.749 0.719 Production Well LPSD WELL A 7/12/2005 0.578 0.555 Production Well LPSD WELL A 10/17/2005 0.871 0.837 Production Well LPSD WELL A 2/10/2006 0.583 0.560 Production Well LPSD WELL A 5/4/2006 0.890 0.855 Production Well LPSD WELL A 7/18/2007 0.210 0.200 Production Well LPSD WELL A 9/22/2008 0.230 0.220 Production Well LPSD WELL A 10/28/2009 0.34 0.33 Production Well LPSD WELL B 2/21/2002 0.610 Production Well LPSD WELL B 3/28/2002 0.551 Production Well LPSD WELL B 4/26/2002 0.532 Production Well LPSD WELL B 7/24/2002 0.443 Production Well LPSD WELL B 10/15/2002 0.537 Production Well LPSD WELL B 2/25/2003 0.480 Production Well LPSD WELL B 5/27/2003 0.488 Production Well LPSD WELL B 8/28/2003 0.398 Production Well LPSD WELL B 12/17/2003 0.440 Production Well LPSD WELL B 12/17/2003 (dup) 0.451 duplicate LPSD WELL B 2/24/2004 0.528 Production Well LPSD WELL B 5/28/2004 0.597 Production Well LPSD WELL B 10/1/2004 1.070 Production Well LPSD WELL B 11/29/2004 1.020 0.981 Production Well LPSD WELL B 1/21/2005 0.590 0.567 Production Well LPSD WELL B 5/18/2005 0.822 0.790 Production Well LPSD WELL B 7/12/2005 0.660 0.634 Production Well LPSD WELL B 10/17/2005 0.917 0.880 Production Well LPSD WELL B 2/10/2006 0.605 0.581 Production Well LPSD WELL B 2/10/06 (dup) 0.602 0.578 duplicate LPSD WELL B 5/4/2006 0.938 0.901 Production Well LPSD WELL B 7/18/2007 0.570 0.550 Production Well LPSD WELL B 9/22/2008 0.860 0.830 Production Well LPSD WELL B 10/28/2009 0.97 0.93 Production Well LPSD WELL C 1/3/2002 0.592 Production Well LPSD WELL C 2/21/2002 0.479 Production Well LPSD WELL C 3/28/2002 0.491 Production Well LPSD WELL C 4/26/2002 0.471 Production Well LPSD WELL C 7/24/2002 0.398 Production Well LPSD WELL C 10/15/2002 0.504 Production Well LPSD WELL C 2/25/2003 0.429 Production Well LPSD WELL C 5/27/2003 0.428 Production Well LPSD WELL C 8/28/2003 0.291 Production Well LPSD WELL C 12/17/2003 0.259 Production Well LPSD WELL C 2/24/2004 0.27 Production Well LPSD WELL C 5/28/2004 0.279 Production Well LPSD WELL C 10/1/2004 0.683 Production Well LPSD WELL C 11/29/2004 0.677 0.650 Production Well LPSD WELL C 1/21/2005 0.324 0.311 Production Well LPSD WELL C 5/18/2005 0.560 0.538 Production Well LPSD WELL C 7/12/2005 0.454 0.436 Production Well LPSD WELL C 10/17/2005 0.676 0.649 Production Well LPSD WELL C 2/10/2006 0.410 0.394 Production Well LPSD WELL C 5/4/2006 0.726 0.697 Production Well LPSD WELL C 7/18/2007 0.450 0.430 Production Well LPSD WELL C 9/22/2008 0.340 0.330 Production Well LPSD WELL C 10/28/2009 0.55 0.53 Production Well LPSD WELL D 1/3/2002 0.758 Production Well LPSD WELL D 2/21/2002 0.725 Production Well LP S D WELL D 3/28/2002 0.692 Production Well



### 11/3/10 Page 26 of 48 Table 4.1

### Table 4.1 APFO and PFOA Results for Public Water Supply Sampling, West Virginia and Ohio Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Location Sample ID Sample Date A PFO (C-8) ug/ L PFOA ug/L* Comments Active Sampling Locations

LPSD WELL D 4/26/2002 0.506 Production Well LPSD WELL D 7/24/2002 0.444 Production Well LPSD WELL D 10/15/2002 0.517 Production Well LPSD WELL D 2/25/2003 0.397 Production Well LPSD WELL D 5/27/2003 0.401 Production Well LPSD WELL D 8/28/2003 0.303 Production Well LPSD WELL D 12/17/2003 0.249 Production Well LPSD WELL D 2/24/2004 0.303 Production Well LPSD WELL D 5/28/2004 0.242 Production Well LPSD WELL D 10/1/2004 0.500 Production Well LPSD WELL D 11/29/2004 0.314 0.301 Production Well LPSD WELL D 1/21/2005 0.186 0.179 Production Well LPSD WELL D 5/18/2005 0.297 0.285 Production Well LPSD WELL D 7/12/2005 0.227 0.218 Production Well LPSD WELL D 10/17/2005 0.262 0.252 Production Well LPSD WELL D 10/17/05 (dup) 0.251 0.241 duplicate LPSD WELL D 2/10/2006 0.193 0.186 Production Well LPSD WELL D 5/4/2006 0.262 0.252 Production Well LPSD WELL D 7/18/2007 0.090 0.086 Production Well LPSD WELL D 9/22/2008 0.090 0.086 Production Well LPSD WELL D 10/28/2009 0.17 0.16 Production Well LPSD WELL E 1/3/2002 0.332 Production Well LPSD WELL E 2/21/2002 1.000 Production Well LPSD WELL E 3/28/2002 1.090 Production Well LPSD WELL E 4/26/2002 1.110 Production Well LPSD WELL E 7/24/2002 1.020 Production Well LPSD WELL E 10/15/2002 1.210 Production Well LPSD WELL E 2/25/2003 1.090 Production Well LPSD WELL E 5/27/2003 1.050 Production Well LPSD WELL E 8/28/2003 0.608 Production Well LPSD WELL E 12/17/2003 0.618 Production Well LPSD WELL E 2/24/2004 0.637 Production Well LPSD WELL E 5/28/2004 0.716 Production Well LPSD WELL E 10/1/2004 2.090 Production Well LPSD WELL E 11/29/2004 2.010 1.930 Production Well LPSD WELL E 1/21/2005 0.549 0.528 Production Well LPSD WELL E 5/18/2005 0.747 0.718 Production Well LPSD WELL E 5/18/2005 (dup) 0.758 0.728 duplicate LPSD WELL E 7/12/2005 0.562 0.540 Production Well LPSD WELL E 10/17/2005 Pump Broken Pump Broken Production Well LPSD WELL E 2/10/2006 0.413 0.397 Production Well LPSD WELL E 5/4/2006 0.765 0.735 Production Well LPSD WELL E 5/4/2006 (dup) 0.790 0.759 duplicate LPSD WELL E 7/18/2007 0.360 0.350 Production Well LPSD WELL E 9/22/2008 0.340 0.330 Production Well LPSD WELL E 10/28/2009 0.36 0.35 Production Well LPSD WELL F 1/3/2002 1.040 Production Well LPSD WELL F 2/21/2002 0.313 Production Well LPSD WELL F 3/28/2002 0.358 Production Well LPSD WELL F 3/28/2002 (dup) 0.352 duplicate LPSD WELL F 4/26/2002 0.332 Production Well LPSD WELL F 7/24/2002 0.284 Production Well LPSD WELL F 7/24/2002 (dup) 0.283 duplicate LPSD WELL F 10/15/2002 0.355 Production Well LPSD WELL F 2/25/2003 Flooded Production Well LPSD WELL F 5/27/2003 0.319 Production Well LPSD WELL F 8/28/2003 0.190 Production Well LPSD WELL F 12/17/2003 No access Production Well LP S D WELL F 2/24/2004 0.531 Production Well



### 11/3/10 Page 27 of 48 Table 4.1

### Table 4.1 APFO and PFOA Results for Public Water Supply Sampling, West Virginia and Ohio Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Location Sample ID Sample Date A PFO (C-8) ug/ L PFOA ug/L* Comments Active Sampling Locations

LPSD WELL F 5/28/2004 0.528 Production Well LPSD WELL F 10/1/2004 0.389 Production Well LPSD WELL F 11/29/2004 0.351 0.337 Production Well LPSD WELL F 1/21/2005 0.603 0.579 Production Well LPSD WELL F 5/18/2005 0.740 0.711 Production Well LPSD WELL F 7/12/2005 0.634 0.609 Production Well LPSD WELL F 10/17/2005 0.887 0.852 Production Well LPSD WELL F 2/10/2006 Pump Broken Pump Broken Production Well LPSD WELL F 5/4/2006 1.090 1.050 Production Well LPSD WELL F 7/18/2007 0.770 0.740 Production Well LPSD WELL F 7/18/2007 (dup) 0.770 0.740 Production Well LPSD WELL F 9/22/2008 0.740 0.710 Production Well LPSD WELL F 9/22/08 (dup) 0.700 0.670 Production Well LPSD WELL F 10/28/2009 0.79 0.76 Production Well LPSD WELL F 10/28/2009 (dup) 0.93 0.89 Production Well LPSD WELL G 7/18/2007 0.970 0.930 Production Well LPSD WELL G 9/22/2008 1.000 1.000 Production Well LPSD WELL G 10/28/2009 1.1 1.1 Production Well LPSD BACKWASH 12/12/2006 0.460 0.440 NPDES Discharge Monitoring LPSD BACKWASH 2/16/2007 0.550 0.530 NPDES Discharge Monitoring LPSD BACKWASH NORTH 5/24/2007 NQ (<0.013) NQ (<0.013) NPDES Discharge Monitoring LPSD BACKWASH SOUTH 5/24/2007 NQ (<0.013) NQ (<0.013) NPDES Discharge Monitoring LPSD BACKWASH 8/24/2007 0.091 0.088 NPDES Discharge Monitoring LPSD BACKWASH 10/31/2007 0.018 0.017 NPDES Discharge Monitoring LPSD BACKWASH 2/8/2008 0.077 0.074 NPDES Discharge Monitoring LPSD BACKWASH 5/21/2008 0.040 0.038 NPDES Discharge Monitoring LPSD BACKWASH 9/12/2008 0.170 0.160 NPDES Discharge Monitoring LPSD BACKWASH 12/1/2008 0.170 0.160 NPDES Discharge Monitoring LPSD BACKWASH 2/24/2009 0.140 0.130 NPDES Discharge Monitoring LPSD BACKWASH 6/3/2009 0.15 0.14 NPDES Discharge Monitoring LPSD BACKWASH 9/15/2009 ND(<0.0026 ) ND(<0.0026 ) NPDES Discharge Monitoring LPSD BACKWASH 12/8/2009 0.11 0.11 NPDES Discharge Monitoring LPSD BACKWASH 3/4/2010 0.15 0.14 NPDES Discharge Monitoring LPSD BACKWASH 6/3/2010 NQ (<0.019) NQ (<0.019) NPDES Discharge Monitoring LPSD BACKWASH 9/9/2010 NQ (<0.012) NQ (<0.012) NPDES Discharge Monitoring LPSD PT 6/7/2007 0.610 0.590 Prior to Carbon Treatment Sample LPSD BED 1N-LEAD 6/7/2007 0.290 0.280 After Carbon Treatment Sample

LPSD BED 2N-LAG 6/7/2007 ND (<0.0027) ND (<0.0027) After Carbon Treatment Sample LPSD BED 1S-LAG 6/7/2007 0.041 0.039 After Carbon Treatment Sample LPSD-BED2S-LEAD 6/7/2007 ND (<0.0027) ND (<0.0027) After Carbon Treatment Sample LPSD PT 6/22/2007 0.580 0.560 Prior to Carbon Treatment Sample LPSD-BED1N-LEAD 6/22/2007 0.470 0.450 After Carbon Treatment Sample LPSD-BED1S-LEAD 6/22/2007 NQ (<0.0062) NQ (<0.0062) After Carbon Treatment Sample

LPSD-BED2N-LAG 6/22/2007 NQ (<0.0062) NQ (<0.0062) After Carbon Treatment Sample LPSD-BED2S-LAG 6/22/2007 0.450 0.430 After Carbon Treatment Sample LPSD PT 7/16/2007 0.570 0.550 Prior to Carbon Treatment Sample LPSD-BED1N-LEAD 7/16/2007 0.012 0.012 After Carbon Treatment Sample LPSD-BED1S-LEAD 7/16/2007 0.030 0.029 After Carbon Treatment Sample

LPSD-BED2N-LAG 7/16/2007 ND (<0.0012) ND (<0.0012) After Carbon Treatment Sample LPSD-BED2S-LAG 7/16/2007 ND (<0.0012) ND (<0.0012) After Carbon Treatment Sample LPSD PT 8/13/2007 0.460 0.440 Prior to Carbon Treatment Sample LPSD-BED1N-LEAD 8/13/2007 0.0097 0.0093 After Carbon Treatment Sample LPSD-BED1S-LEAD 8/13/2007 0.023 0.022 After Carbon Treatment Sample

LPSD-BED2N-LAG 8/13/2007 ND (<0.0012) ND (<0.0012) After Carbon Treatment Sample LPSD-BED2S-LAG 8/13/2007 ND (<0.0012) ND (<0.0012) After Carbon Treatment Sample LPSD PT 9/11/2007 0.5500 0.5300 Prior to Carbon Treatment Sample LPSD-BED1N-LEAD 9/11/2007 0.0950 0.0910 After Carbon Treatment Sample LPSD-BED1S-LEAD 9/11/2007 0.1100 0.1100 After Carbon Treatment Sample

LP S D-BED 2 N-LA G 9/11/2007 ND (<0.0012) ND (<0.0012) After Carbon Treatment Sample



### 11/3/10 Page 28 of 48 Table 4.1

### Table 4.1 APFO and PFOA Results for Public Water Supply Sampling, West Virginia and Ohio Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Location Sample ID Sample Date A PFO (C-8) ug/ L PFOA ug/L* Comments Active Sampling Locations

LPSD-BED2S-LAG 9/11/2007 NQ (<0.0062) NQ (<0.0062) After Carbon Treatment Sample LPSD PT 10/1/2007 0.5300 0.5100 Prior to Carbon Treatment Sample LPSD-BED1N-LEAD 10/1/2007 0.1200 0.1200 After Carbon Treatment Sample LPSD-BED1S-LEAD 10/1/2007 0.1100 0.1100 After Carbon Treatment Sample

LPSD-BED2N-LAG 10/1/2007 ND (<0.0031) ND (<0.0031) After Carbon Treatment Sample LPSD-BED2S-LAG 10/1/2007 NQ (<0.016) NQ (<0.016) After Carbon Treatment Sample LPSD-PT 10/31/2007 0.5000 0.4800 After Carbon Treatment Sample LPSD-BED-2N-LAG 10/31/2007 NQ (<0.016) NQ (<0.016) After Carbon Treatment Sample LP S D-BED- 2S -LA G 10/31/2007 0.0280 0.0270 After Carbon Treatment Sample LPSD PT 11/14/2007 0.4300 0.4100 Prior to Carbon Treatment Sample LPSD-BED2N-LEAD 11/14/2007 0.0270 0.0260 After Carbon Treatment Sample LPSD-BED2S-LEAD 11/14/2007 0.0560 0.0540 After Carbon Treatment Sample

LPSD-BED1N-LAG 11/14/2007 ND (<0.0031) ND (<0.0031) After Carbon Treatment Sample LPSD-BED1S-LAG 11/14/2007 ND (<0.0031) ND (<0.0031) After Carbon Treatment Sample LPSD PT 12/5/2007 0.5400 0.5200 Prior to Carbon Treatment Sample LPSD-BED2N-LEAD 12/5/2007 0.0650 0.0620 After Carbon Treatment Sample LPSD-BED2S-LEAD 12/5/2007 0.0990 0.0950 After Carbon Treatment Sample

LPSD-BED1N-LAG 12/5/2007 ND (<0.0031) ND (<0.0031) After Carbon Treatment Sample LPSD-BED1S-LAG 12/5/2007 ND (<0.0031) ND (<0.0031) After Carbon Treatment Sample LPSD PT 1/18/2008 0.4500 0.4300 Prior to Carbon Treatment Sample LPSD-BED2N-LEAD 1/18/2008 0.0250 0.0240 After Carbon Treatment Sample LPSD-BED2S-LEAD 1/18/2008 0.1200 0.1200 After Carbon Treatment Sample

LPSD-BED1N-LAG 1/18/2008 ND (<0.0022) ND (<0.0022) After Carbon Treatment Sample LPSD-BED1S-LAG 1/18/2008 NQ (<0.011) NQ (<0.011) After Carbon Treatment Sample LPSD-SAMPLESTATION9 2/8/2008 0.0180 0.0170 After Carbon Treatment Sample LPSD PT 2/14/2008 0.4500 0.4300 Prior to Carbon Treatment Sample LPSD-BED1N-LEAD 2/14/2008 0.0210 0.0200 After Carbon Treatment Sample LPSD-BED1S-LEAD 2/14/2008 0.0240 0.0230 After Carbon Treatment Sample

LPSD-BED2N-LAG 2/14/2008 ND (<0.0022) ND (<0.0022) After Carbon Treatment Sample LPSD-BED2S-LAG 2/14/2008 ND (<0.0022) ND (<0.0022) After Carbon Treatment Sample LPSD PT 3/17/2008 0.3300 0.3200 Prior to Carbon Treatment Sample LPSD-BED1N-LEAD 3/17/2008 0.1100 0.1100 After Carbon Treatment Sample LPSD-BED1S-LEAD 3/17/2008 0.0800 0.0770 After Carbon Treatment Sample

LPSD-BED2N-LAG 3/17/2008 ND (<0.0022) ND (<0.0022) After Carbon Treatment Sample LPSD-BED2S-LAG 3/17/2008 ND (<0.0022) ND (<0.0022) After Carbon Treatment Sample LPSD PT 4/18/2008 0.4400 0.4200 Prior to Carbon Treatment Sample LPSD-BED1N-LEAD 4/18/2008 0.1500 0.1400 After Carbon Treatment Sample LPSD-BED1S-LEAD 4/18/2008 0.1300 0.1200 After Carbon Treatment Sample

LPSD-BED2N-LAG 4/18/2008 0.0620 0.0600 After Carbon Treatment Sample LPSD-BED2S-LAG 4/18/2008 NQ (<0.0096) NQ (<0.0096) After Carbon Treatment Sample LPSD PT 5/27/2008 0.5400 0.5200 Prior to Carbon Treatment Sample LPSD-BED1N-LAG 5/27/2008 ND (<0.0019) ND (<0.0019) After Carbon Treatment Sample LPSD-BED1S-LAG 5/27/2008 ND (<0.0019) ND (<0.0019) After Carbon Treatment Sample LPSD-BED2N-LEAD 5/27/2008 0.1700 0.1600 After Carbon Treatment Sample LPSD-BED2S-LEAD 5/27/2008 0.1600 0.1500 After Carbon Treatment Sample LPSD PT 6/13/2008 0.5100 0.4900 Prior to Carbon Treatment Sample LPSD-BED1N-LAG 6/13/2008 ND (<0.0019) ND (<0.0019) After Carbon Treatment Sample LPSD-BED1S-LAG 6/13/2008 ND (<0.0019) ND (<0.0019) After Carbon Treatment Sample LPSD-BED2N-LEAD 6/13/2008 0.1700 0.1600 After Carbon Treatment Sample LPSD-BED2S-LEAD 6/13/2008 0.1700 0.1600 After Carbon Treatment Sample LPSD PT 7/14/2008 0.4300 0.4100 Prior to Carbon Treatment Sample LPSD-BED1N-LAG 7/14/2008 ND (<0.0023) ND (<0.0023) After Carbon Treatment Sample LPSD-BED1S-LAG 7/14/2008 ND (<0.0023) ND (<0.0023) After Carbon Treatment Sample LPSD-BED2N-LEAD 7/14/2008 0.0600 0.0580 After Carbon Treatment Sample LPSD-BED2S-LEAD 7/14/2008 0.1900 0.1800 After Carbon Treatment Sample LPSD PT 8/12/2008 0.5900 0.5700 Prior to Carbon Treatment Sample LPSD-BED1N-LAG 8/12/2008 NQ (<0.012) NQ (<0.012) After Carbon Treatment Sample LPSD-BED1S-LAG 8/12/2008 NQ (<0.012) NQ (<0.012) After Carbon Treatment Sample LP S D-BED 2 N-LEAD 8/12/2008 0.2200 0.2100 After Carbon Treatment Sample



### 11/3/10 Page 29 of 48 Table 4.1

### Table 4.1 APFO and PFOA Results for Public Water Supply Sampling, West Virginia and Ohio Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Location Sample ID Sample Date A PFO (C-8) ug/ L PFOA ug/L* Comments Active Sampling Locations

LPSD-BED2S-LEAD 8/12/2008 0.1800 0.1700 After Carbon Treatment Sample LPSD PT 9/15/2008 0.5100 0.4900 Prior to Carbon Treatment Sample LPSD-BED1N-LEAD 9/15/2008 0.0700 0.0670 After Carbon Treatment Sample LPSD-BED1S-LEAD 9/15/2008 0.1000 0.1000 After Carbon Treatment Sample

LPSD-BED2N-LAG 9/15/2008 ND (<0.0023) ND (<0.0023) After Carbon Treatment Sample LPSD-BED2S-LAG 9/15/2008 ND (<0.0023) ND (<0.0023) After Carbon Treatment Sample LPSD PT 10/20/2008 0.4100 0.3900 Prior to Carbon Treatment Sample LPSD-BED1N-LEAD 10/20/2008 0.0300 0.0290 After Carbon Treatment Sample LPSD-BED1S-LEAD 10/20/2008 0.0580 0.0560 After Carbon Treatment Sample

LPSD-BED2N-LAG 10/20/2008 ND (<0.0017) ND (<0.0017) After Carbon Treatment Sample LP S D-BED 2S -LA G 10/20/2008 ND (<0.0017) ND (<0.0017) After Carbon Treatment Sample LPSD PT 11/21/2008 0.4600 0.4400 Prior to Carbon Treatment Sample LPSD-BED1N-LEAD 11/21/2008 0.1700 0.1600 After Carbon Treatment Sample LPSD-BED1S-LEAD 11/21/2008 0.1900 0.1800 After Carbon Treatment Sample

LPSD-BED2N-LAG 11/21/2008 NQ (<0.0085) NQ (<0.0085) After Carbon Treatment Sample LPSD-BED2S-LAG 11/21/2008 0.0094 0.0090 After Carbon Treatment Sample LPSD PT 12/16/2008 0.5100 0.4900 Prior to Carbon Treatment Sample LPSD-BED1N-LAG 12/16/2008 ND (<0.0017) ND (<0.0017) After Carbon Treatment Sample LPSD-BED1S-LAG 12/16/2008 ND (<0.0017) ND (<0.0017) After Carbon Treatment Sample LPSD-BED2N-LEAD 12/16/2008 0.0320 0.0310 After Carbon Treatment Sample LPSD-BED2S-LEAD 12/16/2008 0.0790 0.0760 After Carbon Treatment Sample LPSD PT 1/21/2009 0.6400 0.6100 Prior to Carbon Treatment Sample LPSD-BED1N-LAG 1/21/2009 ND (<0.0026) ND (<0.0026) After Carbon Treatment Sample LPSD-BED1S-LAG 1/21/2009 NQ (<0.013) NQ (<0.013) After Carbon Treatment Sample LPSD-BED2N-LEAD 1/21/2009 0.1000 0.0960 After Carbon Treatment Sample LPSD-BED2S-LEAD 1/21/2009 0.1700 0.1600 After Carbon Treatment Sample LPSD PT 2/24/2009 0.6000 0.5800 Prior to Carbon Treatment Sample LPSD-BED1N-LEAD 2/24/2009 NQ (<0.013) NQ (<0.013) After Carbon Treatment Sample LPSD-BED1S-LEAD 2/24/2009 0.0500 0.0480 After Carbon Treatment Sample

LPSD-BED2N-LAG 2/24/2009 0.1800 0.1700 After Carbon Treatment Sample LPSD-BED2S-LAG 2/24/2009 ND (<0.0026) ND (<0.0026) After Carbon Treatment Sample LPSD-PT 3/16/2009 0.61 0.59 Prior to Treatment Sample LPSD-BED1N-LEAD 3/16/2009 0.016 0.015 After Carbon Treatment Sample

LPSD-BED2N-LAG 3/16/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample LPSD-BED1S-LEAD 3/16/2009 0.074 0.071 After Carbon Treatment Sample

LPSD-BED2S-LAG 3/16/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample LPSD-PT 4/20/2009 0.67 0.64 Prior to Treatment Sample LPSD-BED1N-LEAD 4/20/2009 0.083 0.08 After Carbon Treatment Sample

LPSD-BED2N-LAG 4/20/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample LPSD-BED1S-LEAD 4/20/2009 0.18 0.17 After Carbon Treatment Sample

LPSD-BED2S-LAG 4/20/2009 NQ (<0.013) NQ (<0.013) After Carbon Treatment Sample LPSD-PT 5/26/2009 0.59 0.57 Prior to Treatment Sample LPSD-BED2N-LEAD 5/26/2009 0.026 0.025 After Carbon Treatment Sample

LPSD-BED1N-LAG 5/26/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample LPSD-BED2S-LEAD 5/26/2009 0.1 0.1 After Carbon Treatment Sample

LPSD-BED1S-LAG 5/26/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample LPSD-PT 6/23/2009 0.46 0.44 Prior to Treatment Sample LPSD-BED2N-LEAD 6/23/2009 0.059 0.057 After Carbon Treatment Sample

LPSD-BED1N-LAG 6/23/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample LPSD-BED2S-LEAD 6/23/2009 0.19 0.18 After Carbon Treatment Sample

LPSD-BED1S-LAG 6/23/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample LPSD-PT 7/21/2009 0.62 0.6 Prior to Treatment Sample LPSD-BED2N-LEAD 7/21/2009 0.14 0.13 After Carbon Treatment Sample

LPSD-BED1N-LAG 7/21/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample LPSD-BED2S-LEAD 7/21/2009 0.32 0.31 After Carbon Treatment Sample

LPSD-BED1S-LAG 7/21/2009 0.014 0.013 After Carbon Treatment Sample LPSD-PT 8/19/2009 0.25 0.24 Prior to Treatment Sample LPSD-BED1N-LEAD 8/19/2009 0.017 0.016 After Carbon Treatment Sample

LP S D-BED 2 N-LA G 8/19/2009 NQ (<0.013) NQ (<0.013) A f ter C arbon Treatment S ample



### 11/3/10 Page 30 of 48 Table 4.1

### Table 4.1 APFO and PFOA Results for Public Water Supply Sampling, West Virginia and Ohio Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Location Sample ID Sample Date A PFO (C-8) ug/ L PFOA ug/L* Comments Active Sampling Locations

LPSD-BED1S-LEAD 8/19/2009 0.08 0.077 After Carbon Treatment Sample

LPSD-BED2S-LAG 8/19/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample LPSD-PT 9/15/2009 0.72 0.69 Prior to Treatment Sample LPSD-BED2N-LEAD 9/15/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample

LPSD-BED1N-LAG 9/15/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample LPSD-BED2S-LEAD 9/15/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample

LPSD-BED1S-LAG 9/15/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample LPSD-PT 10/28/2009 0.51 0.49 Prior to Treatment Sample LPSD-BED2N-LEAD 10/28/2009 NQ (<0.016) NQ (<0.016) After Carbon Treatment Sample

LPSD-BED1N-LAG 10/28/2009 ND(<0.0033 ) ND(<0.0033 ) After Carbon Treatment Sample LPSD-BED2S-LEAD 10/28/2009 0.059 0.057 After Carbon Treatment Sample

LP S D-BED 1S -LA G 10/28/2009 ND(<0.0033 ) ND(<0.0033 ) A f ter C arbon Treatment S ample

LPSD-PT 11/19/2009 0.68 0.65 Prior to Treatment Sample LPSD-BED2N-LEAD 11/19/2009 0.066 0.063 After Carbon Treatment Sample

LPSD-BED1N-LAG 11/19/2009 ND(<0.0033 ) ND(<0.0033 ) After Carbon Treatment Sample LPSD-BED2S-LEAD 11/19/2009 0.096 0.092 After Carbon Treatment Sample

LPSD-BED1S-LAG 11/19/2009 ND(<0.0033 ) ND(<0.0033 ) After Carbon Treatment Sample LPSD-PT 12/15/2009 0.59 0.57 Prior to Treatment Sample LPSD-BED2N-LEAD 12/15/2009 0.17 0.16 After Carbon Treatment Sample

LPSD-BED1N-LAG 12/15/2009 ND(<0.0033 ) ND(<0.0033 ) After Carbon Treatment Sample LPSD-BED2S-LEAD 12/15/2009 0.09 0.086 After Carbon Treatment Sample

LPSD-BED1S-LAG 12/15/2009 ND(<0.0033 ) ND(<0.0033 ) After Carbon Treatment Sample LPSD-PT 1/20/2010 0.5 0.48 Prior to Treatment Sample LPSD-BED2N-LEAD 1/20/2010 0.085 0.082 After Carbon Treatment Sample

LPSD-BED1N-LAG 1/20/2010 ND(<0.0035 ) ND(<0.0035 ) After Carbon Treatment Sample LPSD-BED2S-LEAD 1/20/2010 0.11 0.11 After Carbon Treatment Sample

LPSD-BED1S-LAG 1/20/2010 NQ (<0.018) NQ (<0.018) After Carbon Treatment Sample LPSD-PT 2/18/2010 0.67 0.64 Prior to Treatment Sample

LPSD-BED1N-LEAD 2/18/2010 0.02 0.019 After Carbon Treatment Sample-Sample was reanalyzed to confirm result. Sample was pulled from the second bottle received for the reanalysis. Result confirmed original analysis. Original analysis reported. Anomalous result.

LPSD-BED2N-LAG 2/18/2010 0.42 0.4 After Carbon Treatment Sample-Sample was reanalyzed to confirm result. Sample was pulled from the second bottle received for the reanalysis. Result confirmed original analysis. Original analysis reported. Anomalous result. LPSD-BED1S-LEAD 2/18/2010 0.088 0.085 After Carbon Treatment Sample

LPSD-BED2S-LAG 2/18/2010 ND(<0.0035 ) ND(<0.0035 ) After Carbon Treatment Sample LPSD-PT 3/2/2010 0.66 0.63 Prior to Treatment Sample LPSD-BED1N-LEAD 3/2/2010 0.028 0.027 After Carbon Treatment Sample

LPSD-BED2N-LAG 3/2/2010 ND(<0.0035 ) ND(<0.0035 ) After Carbon Treatment Sample LPSD-BED1S-LEAD 3/2/2010 0.12 0.12 After Carbon Treatment Sample

LPSD-BED2S-LAG 3/2/2010 ND(<0.0035 ) ND(<0.0035 ) After Carbon Treatment Sample LPSD-PT 3/29/2010 0.56 0.54 Prior to Treatment Sample LPSD-BED1N-LEAD 3/29/2010 0.074 0.071 After Carbon Treatment Sample

LPSD-BED2N-LAG 3/29/2010 ND(<0.0038 ) ND(<0.0038 ) After Carbon Treatment Sample LPSD-BED1S-LEAD 3/29/2010 0.08 0.077 After Carbon Treatment Sample

LPSD-BED2S-LAG 3/29/2010 ND(<0.0038 ) ND(<0.0038 ) After Carbon Treatment Sample LPSD-PT 4/28/2010 0.75 0.72 Prior to Treatment Sample LPSD-BED1N-LEAD 4/28/2010 0.094 0.09 After Carbon Treatment Sample

LPSD-BED2N-LAG 4/28/2010 ND(<0.0038 ) ND(<0.0038 ) After Carbon Treatment Sample LPSD-BED1S-LEAD 4/28/2010 0.21 0.2 After Carbon Treatment Sample

LPSD-BED2S-LAG 4/28/2010 NQ (<0.019) NQ (<0.019) A f ter C arbon Treatment S ample



### 11/3/10 Page 31 of 48 Table 4.1

### Table 4.1 APFO and PFOA Results for Public Water Supply Sampling, West Virginia and Ohio Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Location Sample ID Sample Date A PFO (C-8) ug/ L PFOA ug/L* Comments Active Sampling Locations

LPSD-PT 5/20/2010 0.37 0.36 Prior to Treatment Sample LPSD-BED1N-LEAD 5/20/2010 0.17 0.16 After Carbon Treatment Sample

LPSD-BED2N-LAG 5/20/2010 NQ (<0.019) NQ (<0.019) After Carbon Treatment Sample LPSD-BED1S-LEAD 5/20/2010 0.2 0.19 After Carbon Treatment Sample

LPSD-BED2S-LAG 5/20/2010 NQ (<0.019) NQ (<0.019) After Carbon Treatment Sample LPSD-PT 6/22/2010 0.44 0.42 Prior to Treatment Sample LPSD-BED2N-LEAD 6/22/2010 0.041 0.039 After Carbon Treatment Sample

LPSD-BED1N-LAG 6/22/2010 ND(<0.0038 ) ND(<0.0038 ) After Carbon Treatment Sample LPSD-BED2S-LEAD 6/22/2010 0.029 0.028 After Carbon Treatment Sample

LPSD-BED1S-LAG 6/22/2010 ND(<0.0038 ) ND(<0.0038 ) After Carbon Treatment Sample LPSD-PT 7/20/2010 0.53 0.51 Prior to Treatment Sample LPSD-BED2N-LEAD 7/20/2010 0.11 0.11 After Carbon Treatment Sample

LPSD-BED1N-LAG 7/20/2010 ND(<0.0025 ) ND(<0.0025 ) After Carbon Treatment Sample LPSD-BED2S-LEAD 7/20/2010 0.081 0.078 After Carbon Treatment Sample

LPSD-BED1S-LAG 7/20/2010 ND(<0.0025 ) ND(<0.0025 ) After Carbon Treatment Sample LPSD-PT 8/19/2010 0.59 0.57 Prior to Treatment Sample LPSD-BED2N-LEAD 8/19/2010 0.21 0.2 After Carbon Treatment Sample

LPSD-BED1N-LAG 8/19/2010 NQ (<0.012) NQ (<0.012) After Carbon Treatment Sample LPSD-BED2S-LEAD 8/19/2010 0.2 0.19 After Carbon Treatment Sample

LPSD-BED1S-LAG 8/19/2010 NQ (<0.012) NQ (<0.012) After Carbon Treatment Sample Tuppers Plains PSD, OH TPPSDPT 2/6/2002 0.372 Before Treatment Sample TPPSDPT 3/25/2002 0.347 Before Treatment Sample TPPSDPT 7/23/2002 0.240 Before Treatment Sample TPPSDPT 10/15/2002 0.226 Before Treatment Sample TPPSDPT 2/25/2003 0.285 Before Treatment Sample TPPSDPT 5/27/2003 0.288 Before Treatment Sample TPPSDPT 8/28/2003 0.180 Before Treatment Sample TPPSDPT 12/29/2004 0.113 0.109 Before Treatment Sample TPPSDAT 2/6/2002 0.361 After Treatment Sample TPPSDAT 3/25/2002 0.358 After Treatment Sample TPPSDAT 4/24/2002 0.363 After Treatment Sample TPPSDAT 7/23/2002 0.246 After Treatment Sample TPPSDAT 10/15/2002 0.268 After Treatment Sample TPPSDAT 2/25/2003 0.291 After Treatment Sample TPPSDAT 5/27/2003 0.287 After Treatment Sample TPPSDAT 8/28/2003 0.183 After Treatment Sample TPPSDAT 9/16/2004 0.201 After Treatment Sample TPPSDAT 9/16/2004 (dup) 0.229 duplicate TPPSDAT 7/14/2005 0.116 0.111 After Treatment Sample TPPSDAT 7/14/2005 (dup) 0.099 0.095 duplicate TPPSDPW1 2/6/2002 0.726 Production Well TPPSDPW1 3/25/2002 0.705 Production Well TPPSDPW1 4/24/2002 0.702 Production Well TPPSDPW1 7/23/2002 0.588 Production Well TPPSDPW1 10/15/2002 0.486 Production Well TPPSDPW1 2/25/2003 0.532 Production Well TPPSDPW1 5/27/2003 0.541 Production Well TPPSDPW1 5/27/2003 (dup) 0.520 duplicate TPPSDPW1 8/28/2003 0.364 Production Well TPPSDPW1 9/16/2004 0.373 Production Well TPPSDPW1 7/14/2005 0.186 0.179 Production Well TPPSDPW1 9/18/2006 0.160 0.150 Production Well TPPSDPW1 9/10/2007 0.094 0.090 Production Well TPPSDPW1 10/29/2009 0.068 0.065 Production Well TPPSDPW2 2/6/2002 0.417 Production Well TPPSDPW2 3/25/2002 0.327 Production Well TPPSDPW2 4/24/2002 0.371 Production Well TPPSDPW2 7/23/2002 0.235 Production Well TPP S DPW 2 10/15/2002 0.255 Production Well



### 11/3/10 Page 32 of 48 Table 4.1

### Table 4.1 APFO and PFOA Results for Public Water Supply Sampling, West Virginia and Ohio Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Location Sample ID Sample Date A PFO (C-8) ug/ L PFOA ug/L* Comments Active Sampling Locations

TPPSDPW2 2/25/2003 0.356 Production Well TPPSDPW2 5/27/2003 0.350 Production Well TPPSDPW2 8/28/2003 0.211 Production Well TPPSDPW2 9/16/2004 0.287 Production Well TPPSDPW2 7/14/2005 0.116 0.111 Production Well TPPSDPW2 9/18/2006 0.180 0.170 Production Well TPPSDPW2 9/10/2007 0.094 0.090 Production Well TPPSDPW2 9/23/2008 0.061 0.059 Production Well TPPSDPW2 10/29/2009 0.07 0.067 Production Well TPPSDPW3 2/6/2002 NQ (<0.050) Production Well TPPSDPW3 3/25/2002 NQ (<0.050) Production Well TPPSDPW3 7/23/2002 ND (<0.050) Production Well TPPSDPW3 10/15/2002 ND (<0.050) Production Well TPPSDPW3 2/25/2003 NQ (<0.050) Production Well TPPSDPW3 5/27/2003 ND (<0.050) Production Well TPPSDPW3 8/28/2003 ND (<0.050) Production Well TPPSDPW3 9/16/2004 ND (<0.010) Production Well TPPSDPW3 7/14/2005 NQ (<0.007) NQ(<0.007) Production Well TPPSDPW3 9/18/2006 0.023 0.022 Production Well TPPSDPW3 9/10/2007 NQ (<0.0062) NQ (<0.0062) Production Well TPPSDPW3 9/23/2008 0.060 0.058 Production Well TPP S DPW 3 10/29/2009 ND(<0.0033 ) ND(<0.0033 ) Production Well TPPSDPW4 2/6/2002 0.073 Production Well TPPSDPW4 3/25/2002 0.070 Production Well TPPSDPW4 7/23/2002 0.052 Production Well TPPSDPW4 10/15/2002 0.076 Production Well TPPSDPW4 2/25/2003 NQ (<0.050) Production Well TPPSDPW4 5/27/2003 0.078 Production Well TPPSDPW4 8/28/2004 NQ (<0.050) Production Well TPPSDPW4 9/16/2004 NQ (<0.050) Production Well TPPSDPW4 7/14/2005 0.092 0.088 Production Well TPPSDPW4 9/18/2006 0.079 0.076 Production Well TPPSDPW4 9/10/2007 0.036 0.035 Production Well TPPSDPW4 9/23/2008 0.016 0.015 Production Well TPPSDPW4 10/29/2009 0.025 0.024 Production Well TPPSDPW5 2/6/2002 0.201 Production Well TPPSDPW5 3/25/2002 0.201 Production Well TPPSDPW5 7/23/2002 0.216 Production Well TPPSDPW5 10/15/2002 0.229 Production Well TPPSDPW5 2/25/2003 0.297 Production Well TPPSDPW5 5/27/2003 Not Pumping** Production Well TPPSDPW5 8/28/2003 0.205 Production Well TPPSDPW5 9/16/2004 0.277 Production Well TPPSDPW5 7/14/2005 0.132 0.127 Production Well TPPSDPW5 9/18/2006 0.150 0.140 Production Well TPPSDPW5 9/10/2007 0.096 0.092 Production Well TPPSDPW5 9/23/2008 0.075 0.072 Production Well TPPSDPW5 10/29/2009 0.072 0.069 Production Well TPPSDPW6 2/6/2002 0.649 Production Well TPPSDPW6 3/25/2002 0.634 Production Well TPPSDPW6 4/24/2002 0.620 Production Well TPPSDPW6 7/23/2002 0.620 Production Well TPPSDPW6 10/15/2002 0.433 Production Well TPPSDPW6 2/25/2003 0.542 Production Well TPPSDPW6 5/27/2003 0.542 Production Well TPPSDPW6 8/28/2003 0.364 Production Well TPPSDPW6 8/28/2003 (dup) 0.345 duplicate TPPSDPW6 9/16/2004 0.343 Production Well TPP S DPW 6 7/14/2005 0.167 0.160 Production Well



### 11/3/10 Page 33 of 48 Table 4.1

### Table 4.1 APFO and PFOA Results for Public Water Supply Sampling, West Virginia and Ohio Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Location Sample ID Sample Date A PFO (C-8) ug/ L PFOA ug/L* Comments Active Sampling Locations

TPPSDPW6 9/18/2006 0.140 0.130 Production Well TPPSDPW6 9/18/06 (dup) 0.150 0.140 duplicate TPPSDPW6 9/10/2007 0.086 0.083 Production Well TPPSDPW6 9/10/07 (dup) 0.090 0.086 duplicate TPPSDPW6 9/23/2008 0.068 0.065 Production Well TPPSDPW6 9/23/08 (dup) 0.067 0.064 duplicate TPPSDPW6 10/29/2009 0.067 0.064 Production Well TPPSDPW6 10/29/2009 (dup) 0.064 0.061 duplicate

TPPSDPT 5/9/2006 0.111 0.107 Before Treatment Sample TPPSD-BED1N-LEAD 5/9/2006 ND (<0.0012) ND (<0.0012) After Carbon Treatment Sample

TPPSD-BED2N-LAG 5/9/2006 ND (<0.0012) ND (<0.0012) After Carbon Treatment Sample TPPSD-BED1S-LEAD 5/9/2006 ND (<0.0012) ND (<0.0012) After Carbon Treatment Sample

TPPSD-BED2S-LAG 5/9/2006 ND (<0.0012) ND (<0.0012) After Carbon Treatment Sample TPPSDPT 6/15/2006 0.090 0.087 Before Treatment Sample TPPSD-BED1N-LEAD 6/15/2006 NQ (<0.006) NQ (<0.006) After Carbon Treatment Sample

TPPSD-BED2N-LAG 6/15/2006 ND (<0.0012) ND (<0.0012) After Carbon Treatment Sample TPPSD-BED1S-LEAD 6/15/2006 ND (<0.0012) ND (<0.0012) After Carbon Treatment Sample

TPPSD-BED2S-LAG 6/15/2006 ND (<0.0012) ND (<0.0012) After Carbon Treatment Sample TPPSDPT 7/27/2006 0.0884 0.0849 Before Treatment Sample TPPSD-BED1N-LEAD 7/27/2006 ND (<0.0026) ND (<0.0026) After Carbon Treatment Sample

TPPSD-BED2N-LAG 7/27/2006 ND (<0.0026) ND (<0.0026) After Carbon Treatment Sample TPPSD-BED1S-LEAD 7/27/2006 NQ (<0.013) NQ (<0.013) After Carbon Treatment Sample

TPP S D-BED 2S -LA G 7/27/2006 ND (<0.0026) ND (<0.0026) After Carbon Treatment Sample TPPSDPT 8/17/2006 0.098 0.094 Before Treatment Sample TPPSD-BED1N-LEAD 8/17/2006 NQ (<0.013) NQ (<0.013) After Carbon Treatment Sample

TPPSD-BED2N-LAG 8/17/2006 ND (<0.0026) ND (<0.0026) After Carbon Treatment Sample TPPSD-BED1S-LEAD 8/17/2006 NQ (<0.013) NQ (<0.013) After Carbon Treatment Sample

TPPSD-BED2S-LAG 8/17/2006 NQ (<0.013) NQ (<0.013) After Carbon Treatment Sample TPPSDPT 9/18/2006 0.099 0.095 Before Treatment Sample TPPSD-BED1N-LEAD 9/18/2006 NQ (<0.013) NQ (<0.013) After Carbon Treatment Sample

TPPSD-BED2N-LAG 9/18/2006 ND (<0.0026) ND (<0.0026) After Carbon Treatment Sample TPPSD-BED1S-LEAD 9/18/2006 NQ (<0.013) NQ (<0.013) After Carbon Treatment Sample

TPPSD-BED2S-LAG 9/18/2006 ND (<0.0026) ND (<0.0026) After Carbon Treatment Sample TPPSDPT 10/12/2006 0.098 0.094 Before Treatment Sample TPPSD-BED1N-LEAD 10/12/2006 0.018 0.017 After Carbon Treatment Sample

TPPSD-BED2N-LAG 10/12/2006 ND (<0.0018) ND (<0.0018) After Carbon Treatment Sample TPPSD-BED1S-LEAD 10/12/2006 0.024 0.023 After Carbon Treatment Sample

TPPSD-BED2S-LAG 10/12/2006 ND (<0.0018) ND (<0.0018) After Carbon Treatment Sample TPPSD-BED1N-LEAD 11/14/2006 0.017 0.016 After Carbon Treatment Sample

TPPSD-BED2N-LAG 11/14/2006 ND (<0.0018) ND (<0.0018) After Carbon Treatment Sample TPPSD-BED1S-LEAD 11/14/2006 0.020 0.019 After Carbon Treatment Sample

TPPSD-BED2S-LAG 11/14/2006 ND (<0.0018) ND (<0.0018) After Carbon Treatment Sample TPPSDPT 11/27/2006 0.073 0.070 Before Treatment Sample TPPSD-BED1N-LAG 11/27/2006 ND (<0.0018) ND (<0.0018) After Carbon Treatment Sample TPPSD-BED1S-LAG 11/27/2006 ND (<0.0018) ND (<0.0018) After Carbon Treatment Sample TPPSD-BED2N-LEAD 11/27/2006 NQ (<0.0090) NQ (<0.0090) After Carbon Treatment Sample TPPSD-BED2S-LEAD 11/27/2006 NQ (<0.0090) NQ (<0.0090) After Carbon Treatment Sample TPPSDPT 12/14/2006 0.067 0.064 Before Treatment Sample TPPSD-BED1N-LAG 12/14/2006 ND (<0.0018) ND (<0.0018) After Carbon Treatment Sample TPPSD-BED1S-LAG 12/14/2006 ND (<0.0018) ND (<0.0018) After Carbon Treatment Sample TPPSD-BED2N-LEAD 12/14/2006 NQ (<0.0090) NQ (<0.0090) After Carbon Treatment Sample TPPSD-BED2S-LEAD 12/14/2006 NQ (<0.0090) NQ (<0.0090) After Carbon Treatment Sample TPPSDPT 1/17/2007 0.091 0.087 Before Treatment Sample TPPSD-BED1N-LAG 1/17/2007 ND (<0.0010) ND (<0.0010) After Carbon Treatment Sample TPPSD-BED1S-LAG 1/17/2007 ND (<0.0010) ND (<0.0010) After Carbon Treatment Sample TPPSD-BED2N-LEAD 1/17/2007 0.035 0.034 After Carbon Treatment Sample TPPSD-BED2S-LEAD 1/17/2007 0.020 0.019 After Carbon Treatment Sample TPPSDPT 2/15/2007 0.077 0.074 Before Treatment Sample TPP S D-BED 1 N-LA G 2/15/2007 ND (<0.0010) ND (<0.0010) After Carbon Treatment Sample



### 11/3/10 Page 34 of 48 Table 4.1

### Table 4.1 APFO and PFOA Results for Public Water Supply Sampling, West Virginia and Ohio Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Location Sample ID Sample Date A PFO (C-8) ug/ L PFOA ug/L* Comments Active Sampling Locations

TPPSD-BED1S-LAG 2/15/2007 ND (<0.0010) ND (<0.0010) After Carbon Treatment Sample TPPSD-BED2N-LEAD 2/15/2007 0.032 0.031 After Carbon Treatment Sample TPPSD-BED2S-LEAD 2/15/2007 0.016 0.015 After Carbon Treatment Sample TPPSDPT 3/27/2007 0.083 0.080 Before Treatment Sample TPPSD-BED1N-LAG 3/27/2007 ND (<0.0010) ND (<0.0010) After Carbon Treatment Sample TPPSD-BED1S-LAG 3/27/2007 ND (<0.0010) ND (<0.0010) After Carbon Treatment Sample TPPSD-BED2N-LEAD 3/27/2007 0.049 0.047 After Carbon Treatment Sample TPPSD-BED2S-LEAD 3/27/2007 0.034 0.033 After Carbon Treatment Sample TPPSDPT 4/19/2007 0.080 0.077 Before Treatment Sample TPPSD-BED1N-LAG 4/19/2007 NQ (<0.013) NQ (<0.013) After Carbon Treatment Sample TPPSD-BED1S-LAG 4/19/2007 NQ (<0.013) NQ (<0.013) After Carbon Treatment Sample TPPSD-BED2N-LEAD 4/19/2007 0.049 0.047 After Carbon Treatment Sample TPPSD-BED2S-LEAD 4/19/2007 0.041 0.039 After Carbon Treatment Sample TPPSDPT 5/21/2007 0.077 0.074 Before Treatment Sample TPPSD-BED1N-LEAD 5/21/2007 NQ (<0.013) NQ (<0.013) After Carbon Treatment Sample TPPSD-BED1S-LEAD 5/21/2007 NQ (<0.013) NQ (<0.013) After Carbon Treatment Sample

TPPSD-BED2N-LAG 5/21/2007 ND (<0.0027) ND (<0.0027) After Carbon Treatment Sample TPPSD-BED2S-LAG 5/21/2007 ND (<0.0027) ND (<0.0027) After Carbon Treatment Sample TPPSDPT 6/21/2007 0.082 0.079 Before Treatment Sample TPPSD-BED1N-LEAD 6/21/2007 0.020 0.019 After Carbon Treatment Sample TPPSD-BED1S-LEAD 6/21/2007 0.016 0.015 After Carbon Treatment Sample

TPPSD-BED2N-LAG 6/21/2007 ND (<0.0019) ND (<0.0019) After Carbon Treatment Sample TPP S D-BED 2S -LA G 6/21/2007 ND (<0.0019) ND (<0.0019) After Carbon Treatment Sample TPPSDPT 7/19/2007 0.073 0.070 Before Treatment Sample TPPSD-BED1N-LEAD 7/19/2007 0.027 0.026 After Carbon Treatment Sample TPPSD-BED1S-LEAD 7/19/2007 0.023 0.022 After Carbon Treatment Sample

TPPSD-BED2N-LAG 7/19/2007 ND (<0.0012) ND (<0.0012) After Carbon Treatment Sample TPPSD-BED2S-LAG 7/19/2007 ND (<0.0012) ND (<0.0012) After Carbon Treatment Sample TPPSDPT 8/15/2007 0.062 0.059 Before Treatment Sample TPPSD-BED1N-LEAD 8/15/2007 0.033 0.032 After Carbon Treatment Sample TPPSD-BED1S-LEAD 8/15/2007 0.030 0.029 After Carbon Treatment Sample

TPPSD-BED2N-LAG 8/15/2007 ND (<0.0012) ND (<0.0012) After Carbon Treatment Sample TPPSD-BED2S-LAG 8/15/2007 ND (<0.0012) ND (<0.0012) After Carbon Treatment Sample TPPSDPT 9/10/2007 0.072 0.069 Before Treatment Sample TPPSD-BED1N-LEAD 9/10/2007 0.039 0.038 After Carbon Treatment Sample TPPSD-BED1S-LEAD 9/10/2007 0.043 0.041 After Carbon Treatment Sample

TPPSD-BED2N-LAG 9/10/2007 NQ (<0.0062) NQ (<0.0062) After Carbon Treatment Sample TPPSD-BED2S-LAG 9/10/2007 NQ (<0.0062) NQ (<0.0062) After Carbon Treatment Sample TPPSDPT 10/1/2007 0.073 0.070 Before Treatment Sample TPPSD-BED1N-LEAD 10/1/2007 0.040 0.038 After Carbon Treatment Sample TPPSD-BED1S-LEAD 10/1/2007 0.041 0.039 After Carbon Treatment Sample

TPPSD-BED2N-LAG 10/1/2007 NQ (<0.016) NQ (<0.016) After Carbon Treatment Sample TPPSD-BED2S-LAG 10/1/2007 NQ (<0.016) NQ (<0.016) After Carbon Treatment Sample TPPSDPT 11/13/2007 0.067 0.064 Before Treatment Sample TPPSD-BED2N-LEAD 11/13/2007 0.019 0.018 After Carbon Treatment Sample TPPSD-BED2S-LEAD 11/13/2007 0.017 0.016 After Carbon Treatment Sample

TPPSD-BED1N-LAG 11/13/2007 ND (<0.0031) ND (<0.0031) After Carbon Treatment Sample TPPSD-BED1S-LAG 11/13/2007 ND (<0.0031) ND (<0.0031) After Carbon Treatment Sample TPPSDPT-N 12/18/2007 0.077 0.074 Before Treatment Sample TPPSD-BED2N-LEAD 12/18/2007 0.032 0.031 After Carbon Treatment Sample TPPSD-BED2S-LEAD 12/18/2007 0.033 0.032 After Carbon Treatment Sample

TPPSD-BED1N-LAG 12/18/2007 ND (<0.0031) ND (<0.0031) After Carbon Treatment Sample TPPSD-BED1S-LAG 12/18/2007 ND (<0.0031) ND (<0.0031) After Carbon Treatment Sample TPPSDPT-N 1/15/2008 0.071 0.068 Before Treatment Sample TPPSD-BED2N-LEAD 1/15/2008 0.032 0.031 After Carbon Treatment Sample TPPSD-BED2S-LEAD 1/15/2008 0.036 0.035 After Carbon Treatment Sample

TPPSD-BED1N-LAG 1/15/2008 ND (<0.0022) ND (<0.0022) After Carbon Treatment Sample TPPSD-BED1S-LAG 1/15/2008 ND (<0.0022) ND (<0.0022) After Carbon Treatment Sample TPP S DPT-N 2/13/2008 0.072 0.069 Before Treatment Sample



### 11/3/10 Page 35 of 48 Table 4.1

### Table 4.1 APFO and PFOA Results for Public Water Supply Sampling, West Virginia and Ohio Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Location Sample ID Sample Date A PFO (C-8) ug/ L PFOA ug/L* Comments Active Sampling Locations

TPPSD-BED2N-LEAD 2/13/2008 0.032 0.031 After Carbon Treatment Sample TPPSD-BED2S-LEAD 2/13/2008 0.034 0.033 After Carbon Treatment Sample

TPPSD-BED1N-LAG 2/13/2008 ND (<0.0022) ND (<0.0022) After Carbon Treatment Sample TPPSD-BED1S-LAG 2/13/2008 ND (<0.0022) ND (<0.0022) After Carbon Treatment Sample TPPSDPT-N 3/12/2008 0.087 0.084 Before Treatment Sample TPPSD-BED2N-LEAD 3/12/2008 0.046 0.044 After Carbon Treatment Sample TPPSD-BED2S-LEAD 3/12/2008 0.042 0.040 After Carbon Treatment Sample

TPPSD-BED1N-LAG 3/12/2008 NQ (<0.011) NQ (<0.011) After Carbon Treatment Sample TPPSD-BED1S-LAG 3/12/2008 NQ (<0.011) NQ (<0.011) After Carbon Treatment Sample TPPSDPT-N 4/10/2008 0.056 0.054 Before Treatment Sample TPPSD-BED1N-LEAD 4/10/2008 NQ (<0.0096) NQ (<0.0096) After Carbon Treatment Sample TPPSD-BED1S-LEAD 4/10/2008 NQ (<0.0096) NQ (<0.0096) After Carbon Treatment Sample

TPPSD-BED2N-LAG 4/10/2008 ND (<0.0019) ND (<0.0019) After Carbon Treatment Sample TPPSD-BED2S-LAG 4/10/2008 ND (<0.0019) ND (<0.0019) After Carbon Treatment Sample TPPSDPT-N 5/28/2008 0.053 0.051 Before Treatment Sample TPPSD-BED1N-LEAD 5/28/2008 0.019 0.018 After Carbon Treatment Sample TPPSD-BED1S-LEAD @ 5/28/2008 ND(<0.0019 ) ND(<0.0019 ) After Carbon Treatment Sample

TPPSD-BED2N-LAG 5/28/2008 ND (<0.0019) ND (<0.0019) After Carbon Treatment Sample TPPSD-BED2S-LAG @ 5/28/2008 0.017 0.016 After Carbon Treatment Sample TPPSDPT-N 6/13/2008 0.052 0.05 Before Treatment Sample TPPSD-BED1N-LEAD 6/13/2008 0.019 0.018 After Carbon Treatment Sample TPPSD-BED1S-LEAD 6/13/2008 0.016 0.015 After Carbon Treatment Sample

TPPSD-BED2N-LAG 6/13/2008 ND (<0.0019) ND (<0.0019) After Carbon Treatment Sample TPP S D-BED 2S -LA G 6/13/2008 ND (<0.0019) ND (<0.0019) After Carbon Treatment Sample TPPSDPT-N 7/14/2008 0.048 0.046 Before Treatment Sample TPPSD-BED1N-LEAD 7/14/2008 0.023 0.022 After Carbon Treatment Sample TPPSD-BED1S-LEAD 7/14/2008 0.021 0.02 After Carbon Treatment Sample

TPPSD-BED2N-LAG 7/14/2008 ND (<0.0023) ND (<0.0023) After Carbon Treatment Sample TPPSD-BED2S-LAG 7/14/2008 ND (<0.0023) ND (<0.0023) After Carbon Treatment Sample TPPSDPT-N 8/11/2008 0.048 0.046 Before Treatment Sample TPPSD-BED1N-LEAD 8/11/2008 0.023 0.022 After Carbon Treatment Sample TPPSD-BED1S-LEAD 8/11/2008 0.023 0.022 After Carbon Treatment Sample

TPPSD-BED2N-LAG 8/11/2008 ND (<0.0023) ND (<0.0023) After Carbon Treatment Sample TPPSD-BED2S-LAG 8/11/2008 ND (<0.0023) ND (<0.0023) After Carbon Treatment Sample TPPSDPT-N 9/8/2008 0.046 0.044 Before Treatment Sample TPPSD-BED1N-LEAD 9/8/2008 0.028 0.027 After Carbon Treatment Sample TPPSD-BED1S-LEAD 9/8/2008 0.026 0.025 After Carbon Treatment Sample

TPPSD-BED2N-LAG 9/8/2008 NQ (<0.012) NQ (<0.012) After Carbon Treatment Sample TPPSD-BED2S-LAG 9/8/2008 ND (<0.0023) ND (<0.0023) After Carbon Treatment Sample TPPSDPT-N 10/17/2008 0.054 0.052 Before Treatment Sample TPPSD-BED1N-LAG 10/17/2008 ND (<0.0017) ND (<0.0017) After Carbon Treatment Sample TPPSD-BED1S-LAG 10/17/2008 ND (<0.0017) ND (<0.0017) After Carbon Treatment Sample TPPSD-BED2N-LEAD 10/17/2008 0.016 0.015 After Carbon Treatment Sample TPPSD-BED2S-LEAD 10/17/2008 0.0094 0.009 After Carbon Treatment Sample TPPSDPT-N 11/21/2008 0.049 0.047 Before Treatment Sample TPPSD-BED1N-LAG 11/21/2008 ND (<0.0017) ND (<0.0017) After Carbon Treatment Sample TPPSD-BED1S-LAG 11/21/2008 ND (<0.0017) ND (<0.0017) After Carbon Treatment Sample TPPSD-BED2N-LEAD 11/21/2008 0.018 0.017 After Carbon Treatment Sample TPPSD-BED2S-LEAD 11/21/2008 0.016 0.015 After Carbon Treatment Sample TPPSDPT-N 12/16/2008 0.068 0.065 Before Treatment Sample TPPSD-BED1N-LAG 12/16/2008 ND (<0.0017) ND (<0.0017) After Carbon Treatment Sample TPPSD-BED1S-LAG 12/16/2008 ND (<0.0017) ND (<0.0017) After Carbon Treatment Sample TPPSD-BED2N-LEAD 12/16/2008 0.03 0.029 After Carbon Treatment Sample TPPSD-BED2S-LEAD 12/16/2008 0.028 0.027 After Carbon Treatment Sample TPPSDPT-N 1/22/2009 0.05 0.048 Before Treatment Sample TPPSD-BED1N-LAG 1/22/2009 ND (<0.0026) ND (<0.0026) After Carbon Treatment Sample TPPSD-BED2N-LEAD 1/22/2009 0.026 0.025 After Carbon Treatment Sample TPPSD-BED2S-LEAD 1/22/2009 0.025 0.024 After Carbon Treatment Sample TPP S DPT-N 2/24/2009 0.065 0.062 Before Treatment Sample



### 11/3/10 Page 36 of 48 Table 4.1

### Table 4.1 APFO and PFOA Results for Public Water Supply Sampling, West Virginia and Ohio Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Location Sample ID Sample Date A PFO (C-8) ug/ L PFOA ug/L* Comments Active Sampling Locations

TPPSD-BED1N-LAG 2/24/2009 NQ (<0.013) NQ (<0.013) After Carbon Treatment Sample TPPSD-BED1S-LAG 2/24/2009 ND (<0.0026) ND (<0.0026) After Carbon Treatment Sample TPPSD-BED2N-LEAD 2/24/2009 0.032 0.031 After Carbon Treatment Sample TPPSD-BED2S-LEAD 2/24/2009 0.026 0.025 After Carbon Treatment Sample TPPSD-PT 3/26/2009 0.054 0.052 Prior to Treatment Sample TPPSD-BED1N-LEAD 3/26/2009 NQ (<0.013) NQ (<0.013) After Carbon Treatment Sample

TPPSD-BED2N-LAG 3/26/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample TPPSD-BED1S-LEAD 3/26/2009 NQ (<0.013) NQ (<0.013) After Carbon Treatment Sample

TPPSD-BED2S-LAG 3/26/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample TPPSD-PT 4/20/2009 0.064 0.061 Prior to Treatment Sample TPPSD-BED1N-LEAD 4/20/2009 0.015 0.014 After Carbon Treatment Sample

TPPSD-BED2N-LAG 4/20/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample TPPSD-BED1S-LEAD 4/20/2009 0.017 0.016 After Carbon Treatment Sample

TPPSD-BED2S-LAG 4/20/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample TPPSD-PT 5/13/2009 0.054 0.052 Prior to Treatment Sample TPPSD-BED1N-LEAD 5/13/2009 0.018 0.017 After Carbon Treatment Sample

TPPSD-BED2N-LAG 5/13/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample TPPSD-BED1S-LEAD 5/13/2009 0.017 0.016 After Carbon Treatment Sample

TPPSD-BED2S-LAG 5/13/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample TPPSD-PT 6/23/2009 0.057 0.055 Prior to Treatment Sample TPPSD-BED1N-LEAD 6/23/2009 0.02 0.019 After Carbon Treatment Sample

TPPSD-BED2N-LAG 6/23/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample TPPSD-BED1S-LEAD 6/23/2009 0.021 0.02 After Carbon Treatment Sample

TPP S D-BED 2S -LA G 6/23/2009 ND(<0.0026 ) ND(<0.0026 ) A f ter C arbon Treatment S ample

TPPSD-PT 7/21/2009 0.056 0.054 Prior to Treatment Sample TPPSD-BED1N-LEAD 7/21/2009 0.024 0.023 After Carbon Treatment Sample

TPPSD-BED2N-LAG 7/21/2009 NQ (<0.013) NQ (<0.013) After Carbon Treatment Sample TPPSD-BED1S-LEAD 7/21/2009 0.019 0.018 After Carbon Treatment Sample

TPPSD-BED2S-LAG 7/21/2009 NQ (<0.013) NQ (<0.013) After Carbon Treatment Sample TPPSD-PT 8/19/2009 0.045 0.043 Prior to Treatment Sample TPPSD-BED2N-LEAD 8/19/2009 0.016 0.015 After Carbon Treatment Sample

TPPSD-BED1N-LAG 8/19/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample TPPSD-BED2S-LEAD 8/19/2009 0.017 0.016 After Carbon Treatment Sample

TPPSD-BED1S-LAG 8/19/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample TPPSD-PT 9/14/2009 0.046 0.044 Prior to Treatment Sample TPPSD-BED2N-LEAD 9/14/2009 0.023 0.022 After Carbon Treatment Sample

TPPSD-BED1N-LAG 9/14/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample TPPSD-BED2S-LEAD 9/14/2009 0.025 0.024 After Carbon Treatment Sample

TPPSD-BED1S-LAG 9/14/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample TPPSD-PT 10/28/2009 0.06 0.058 Prior to Treatment Sample TPPSD-BED2N-LEAD 10/28/2009 0.03 0.029 After Carbon Treatment Sample

TPPSD-BED1N-LAG 10/28/2009 NQ (<0.016) NQ (<0.016) After Carbon Treatment Sample TPPSD-BED2S-LEAD 10/28/2009 0.032 0.031 After Carbon Treatment Sample

TPPSD-BED1S-LAG 10/28/2009 NQ (<0.016) NQ (<0.016) After Carbon Treatment Sample TPPSD-PT 11/24/2009 0.082 0.079 Prior to Treatment Sample TPPSD-BED1N-LEAD 11/24/2009 NQ (<0.016) NQ (<0.016) After Carbon Treatment Sample

TPPSD-BED2N-LAG 11/24/2009 ND(<0.0033 ) ND(<0.0033 ) After Carbon Treatment Sample TPPSD-BED1S-LEAD 11/24/2009 NQ (<0.016) NQ (<0.016) After Carbon Treatment Sample

TPPSD-BED2S-LAG 11/24/2009 ND(<0.0033 ) ND(<0.0033 ) After Carbon Treatment Sample TPPSD-PT 12/15/2009 0.042 0.04 Prior to Treatment Sample TPPSD-BED1N-LEAD 12/15/2009 NQ (<0.016) NQ (<0.016) After Carbon Treatment Sample

TPPSD-BED2N-LAG 12/15/2009 ND(<0.0033 ) ND(<0.0033 ) After Carbon Treatment Sample TPPSD-BED1S-LEAD 12/15/2009 NQ (<0.016) NQ (<0.016) After Carbon Treatment Sample

TPPSD-BED2S-LAG 12/15/2009 ND(<0.0033 ) ND(<0.0033 ) After Carbon Treatment Sample TPPSD-PT 1/19/2010 0.052 0.05 Prior to Treatment Sample TPPSD-BED1N-LEAD 1/19/2010 NQ (<0.018) NQ (<0.018) After Carbon Treatment Sample

TPPSD-BED2N-LAG 1/19/2010 ND(<0.0035 ) ND(<0.0035 ) After Carbon Treatment Sample TPPSD-BED1S-LEAD 1/19/2010 0.02 0.019 After Carbon Treatment Sample

TPP S D-BED 2S -LA G 1/19/2010 ND(<0.0035 ) ND(<0.0035 ) A f ter C arbon Treatment S ample



### 11/3/10 Page 37 of 48 Table 4.1

### Table 4.1 APFO and PFOA Results for Public Water Supply Sampling, West Virginia and Ohio Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Location Sample ID Sample Date A PFO (C-8) ug/ L PFOA ug/L* Comments Active Sampling Locations

TPPSD-PT 2/19/2010 0.059 0.057 Prior to Treatment Sample TPPSD-BED1N-LEAD 2/19/2010 0.029 0.028 After Carbon Treatment Sample

TPPSD-BED2N-LAG 2/19/2010 ND(<0.0035 ) ND(<0.0035 ) After Carbon Treatment Sample TPPSD-BED1S-LEAD 2/19/2010 0.027 0.026 After Carbon Treatment Sample

TPPSD-BED2S-LAG 2/19/2010 ND(<0.0035 ) ND(<0.0035 ) After Carbon Treatment Sample TPPSD-PT 3/22/2010 0.059 0.057 Prior to Treatment Sample TPPSD-BED2N-LEAD 3/22/2010 0.037 0.036 After Carbon Treatment Sample

TPPSD-BED1N-LAG 3/22/2010 NQ (<0.018) NQ (<0.018) After Carbon Treatment Sample TPPSD-BED2S-LEAD 3/22/2010 0.036 0.035 After Carbon Treatment Sample

TPPSD-BED1S-LAG 3/22/2010 NQ (<0.018) NQ (<0.018) After Carbon Treatment Sample TPPSD-PT 4/29/2010 0.046 0.044 Prior to Treatment Sample TPPSD-BED2N-LEAD 4/29/2010 NQ (<0.019) NQ (<0.019) After Carbon Treatment Sample

TPPSD-BED1N-LAG 4/29/2010 ND(<0.0038 ) ND(<0.0038 ) After Carbon Treatment Sample TPPSD-BED2S-LEAD 4/29/2010 NQ (<0.019) NQ (<0.019) After Carbon Treatment Sample

TPPSD-BED1S-LAG 4/29/2010 ND(<0.0038 ) ND(<0.0038 ) After Carbon Treatment Sample TPPSD-PT 5/20/2010 0.044 0.042 Prior to Treatment Sample TPPSD-BED2N-LEAD 5/20/2010 NQ (<0.019) NQ (<0.019) After Carbon Treatment Sample

TPPSD-BED1N-LAG 5/20/2010 ND(<0.0038 ) ND(<0.0038 ) After Carbon Treatment Sample TPPSD-BED2S-LEAD 5/20/2010 NQ (<0.019) NQ (<0.019) After Carbon Treatment Sample

TPPSD-BED1S-LAG 5/20/2010 ND(<0.0038 ) ND(<0.0038 ) After Carbon Treatment Sample TPPSD-PT 6/23/2010 0.046 0.044 Prior to Treatment Sample TPPSD-BED2N-LEAD 6/23/2010 0.022 0.021 After Carbon Treatment Sample

TPPSD-BED1N-LAG 6/23/2010 ND(<0.0038 ) ND(<0.0038 ) After Carbon Treatment Sample TPPSD-BED2S-LEAD 6/23/2010 0.022 0.021 After Carbon Treatment Sample

TPPSD-BED1S-LAG 6/23/2010 ND(<0.0038 ) ND(<0.0038 ) After Carbon Treatment Sample TPPSD-PT 7/20/2010 0.05 0.048 Prior to Treatment Sample TPPSD-BED2N-LEAD 7/20/2010 0.021 0.02 After Carbon Treatment Sample

TPPSD-BED1N-LAG 7/20/2010 ND(<0.0025 ) ND(<0.0025 ) After Carbon Treatment Sample TPPSD-BED2S-LEAD 7/20/2010 0.019 0.018 After Carbon Treatment Sample

TPPSD-BED1S-LAG 7/20/2010 ND(<0.0025 ) ND(<0.0025 ) After Carbon Treatment Sample TPPSD-PT 8/19/2010 0.051 0.049 Prior to Treatment Sample TPPSD-BED2N-LEAD 8/19/2010 0.025 0.024 After Carbon Treatment Sample

TPPSD-BED1N-LAG 8/19/2010 NQ (<0.012) NQ (<0.012) After Carbon Treatment Sample TPPSD-BED2S-LEAD 8/19/2010 0.023 0.022 After Carbon Treatment Sample

TPPSD-BED1S-LAG 8/19/2010 NQ (<0.012) NQ (<0.012) After Carbon Treatment Sample BWASH-TP-N 4/6/2006 0.00872 0.00838 NPDES Discharge Monitoring BWASH-TP-S 4/6/2006 0.0176 0.0169 NPDES Discharge Monitoring BWASH-TP-N 11/15/2006 0.0200 0.0190 NPDES Discharge Monitoring BWA S H-TP- S 11/15/2006 0.0180 0.0170 NPDES Discharge Monitoring BWASH-TP-N 5/16/2007 NQ (<0.013) NQ (<0.013) NPDES Discharge Monitoring BWASH-TP-N 5/16/07 (dup) ND (<0.0027) ND (<0.0027) NPDES Discharge Monitoring BWASH-TP-S 5/16/2007 NQ (<0.013) NQ (<0.013) NPDES Discharge Monitoring BWASH-TP-S 5/16/07 (dup) ND (0.0027) ND (<0.0027) NPDES Discharge Monitoring BWASH-TP-N 11/7/2007 NQ (<0.016) NQ (<0.016) NPDES Discharge Monitoring BWASH-TP-S 11/7/2007 0.0190 0.0180 NPDES Discharge Monitoring BWASH-TP-S 11/7/07 (dup) 0.0180 0.0170 NPDES Discharge Monitoring BWASH-TP-N 4/3/2008 0.0210 0.0200 NPDES Discharge Monitoring BWASH-TP-S 4/3/2008 0.0160 0.0150 NPDES Discharge Monitoring BWASH-TP-S 4/3/08 (dup) 0.0190 0.0180 NPDES Discharge Monitoring BWASH-TP-N 10/8/2008 0.0400 0.0380 NPDES Discharge Monitoring BWASH-TP-S 10/8/2008 0.0340 0.0330 NPDES Discharge Monitoring BWASH-TP-S 10/8/08 (dup) 0.0420 0.0400 NPDES Discharge Monitoring

BWASH-TP 3/25/2009 0.0330 0.0320 NPDES Discharge Monitoring BWASH-TP 3/25/09 (dup) 0.0330 0.0320 NPDES Discharge Monitoring BWASH-TP 8/12/2009 0.018 0.017 NPDES Discharge Monitoring BWASH-TP-2 8/12/2009 (dup) 0.018 0.017 NPDES Discharge Monitoring-Du p

BWASH-TP 11/24/2009 0.023 0.022 NPDES Discharge Monitoring BWASH-TP-2 11/24/2009 (dup) 0.024 0.023 NPDES Discharge Monitoring-Du p BACKWASH-TP 4/21/2010 0.043 0.041 NPDE S Discharge Monitoring



### 11/3/10 Page 38 of 48 Table 4.1

### Table 4.1 APFO and PFOA Results for Public Water Supply Sampling, West Virginia and Ohio Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Location Sample ID Sample Date A PFO (C-8) ug/ L PFOA ug/L* Comments Active Sampling Locations

BWASH-TP 9/17/2010 0.038 0.037 NPDES Discharge Monitoring BWASH-TP-2 9/17/2010 0.043 0.041 NPDES Discharge Monitoring-Du p

STALL-TP-S 3/31/2006 0.126 0.121 NPDES Discharge Monitoring STALL-TP-N 3/31/2006 0.154 0.148 NPDES Discharge Monitoring STALL-TP-N 11/14/2006 0.073 0.070 NPDES Discharge Monitoring STALL-TP-S 4/2/2008 0.022 0.021 NPDES Discharge Monitoring Mason County PSD, WV MASONCPSDAT 7/28/2005 0.024 0.023 After Treatment Sample MASONCPSDAT 12/13/2006 0.029 0.028 After Treatment Sample MASONCPSDAT 12/13/06 (dup) 0.027 0.026 After Treatment Sample MASONCPSDAT 12/3/2007 NQ (<0.016) NQ (<0.016) After Treatment Sample MASONCPSDAT 10/30/2008 NQ (<0.0085) NQ (<0.0085) After Treatment Sample MASONCPSDAT 10/23/2009 NQ (<0.016) NQ (<0.016) After Treatment Sample

MASONCPSD1 1/29/2002 NQ (<0.050) Production Well MASONCPSD1 3/27/2002 NQ (<0.050) Production Well MASONCPSD1 4/25/2002 NQ (<0.050) Production Well MASONCPSD1 9/23/2004 0.075 Production Well MASONCPSD1 7/28/2005 0.019 0.018 Production Well MASONCPSD1 7/28/2005 (dup) 0.018 0.017 duplicate MASONCPSD1 12/13/2006 0.015 0.015 Production Well MASONCPSD1 12/3/2007 NQ (<0.016) NQ (<0.016) Production Well MASONCPSD1 10/30/2008 NQ (<0.0085) NQ (<0.0085) Production Well MASONCPSD1 10/23/2009 NQ (<0.016) NQ (<0.016) Production Well MASONCPSD1/3 1/7/2005 NQ (<0.05) NQ(<0.05) Production Wells Combined MASONCPSD1/3 12/3/2007 NQ (<0.016) NQ (<0.016) Production Wells Combined

MASONCPSD2 1/29/2002 0.062 Production Well MASONCPSD2 3/27/2002 0.084 Production Well MASONCPSD2 4/25/2002 0.071 Production Well MASONCPSD2 9/23/2004 NQ (<0.050) Production Well MASONCPSD2 7/28/2005 0.040 0.038 Production Well MASONCPSD2 12/13/2006 0.032 0.031 Production Well MASONCPSD2 12/3/2007 0.030 0.029 Production Well MASONCPSD2 10/30/2008 0.036 0.035 Production Well MASONCPSD2 10/23/2009 0.031 0.03 Production Well MASONCPSD2/3 12/13/2006 0.027 0.026 Production Wells Combined MASONCPSD2/4 1/7/2005 NQ (<0.05) NQ(<0.05) Production Wells Combined

MASONCPSD3 1/29/2002 0.071 Production Well MASONCPSD3 3/27/2002 0.102 Production Well MASONCPSD3 4/25/2002 0.063 Production Well MASONCPSD3 9/23/2004 0.068 Production Well MASONCPSD3 7/28/2005 0.026 0.025 Production Well MASONCPSD3 12/13/2006 0.019 0.018 Production Well MA SO N C P S D 3 12/3/2007 0.018 0.017 Production Well MASONCPSD3 10/30/2008 0.011 0.011 Production Well MASONCPSD3 10/30/08 (dup) 0.010 0.010 duplicate MASONCPSD3 10/23/2009 0.018 0.017 Production Well MASONCPSD4 9/23/2004 NQ (<0.050) Production Well MASONCPSD4 9/23/04 (dup) NQ (<0.050) duplicate MASONCPSD4 7/28/2005 0.035 0.033 Production Well MASONCPSD4 12/13/2006 0.026 0.025 Production Well MASONCPSD4 12/3/2007 0.056 0.054 Production Well MASONCPSD4 12/3/07 (dup) 0.046 0.044 duplicate MASONCPSD4 10/23/2009 0.02 0.019 Production Well MASONCPSD4 10/23/2009 (dup) 0.02 0.019 duplicate CRABCREEK PT 1/7/2005 NQ (<0.050) NQ (<0.050) Before Treatment Sample CRABCREEK PT 9/22/2005 0.029 0.028 Before Treatment Sample CRABCREEK PT 12/13/2006 0.020 0.019 Before Treatment Sample CRABCREEK PT 12/3/2007 0.027 0.026 Before Treatment Sample CRABCREEK PT 10/30/2008 0.017 0.016 Before Treatment Sample C RAB C REEK PT 10/26/2009 NQ (<0.016) NQ (<0.016) Before Treatment Sample



### 11/3/10 Page 39 of 48 Table 4.1

### Table 4.1 APFO and PFOA Results for Public Water Supply Sampling, West Virginia and Ohio Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Location Sample ID Sample Date A PFO (C-8) ug/ L PFOA ug/L* Comments Active Sampling Locations

CRABCREEK AT 1/7/2005 NQ (<0.050) NQ (<0.050) After Treatment Sample CRABCREEK AT 7/28/2005 0.016 0.016 After Treatment Sample CRABCREEK AT 12/13/2006 0.020 0.019 After Treatment Sample CRABCREEK AT 12/13/06 (dup) 0.022 0.021 duplicate CRABCREEK AT 12/3/2007 0.021 0.020 After Treatment Sample CRABCREEK AT 12/3/07 (dup) 0.025 0.024 duplicate CRABCREEK AT 10/30/2008 0.014 0.013 After Treatment Sample CRABCREEK AT 10/26/2009 ND(<0.0033 ) ND(<0.0033 ) After Treatment Sample CRABCREEK Well 1 1/7/2005 NQ (<0.050) NQ (<0.050) Production Well CRABCREEK Well 1 1/7/2005 NQ (<0.050) NQ (<0.050) Production Well CRABCREEK Well 1 7/28/2005 0.014 0.013 Production Well CRABCREEK Well 1 12/13/2006 0.019 0.018 Production Well CRABCREEK Well 1 12/3/2007 0.020 0.019 Production Well CRABCREEK Well 1 10/30/2008 0.012 0.012 Production Well CRABCREEK Well 1 10/30/08 (dup) 0.012 0.012 duplicate CRABCREEK Well 1 10/26/2009 NQ (<0.016) NQ (<0.016) Production Well CRABCREEK Well 1 10/26/2009 (dup) NQ (<0.016) NQ (<0.016) duplicate CRABCREEK Well 2 1/7/2005 ND (<0.01) ND (<0.01) Production Well CRABCREEK Well 2 7/28/2005 0.028 0.027 Production Well CRABCREEK Well 2 12/13/2006 NQ (<0.0090) NQ (<0.0090) Production Well CRABCREEK Well 2 12/3/2007 NQ (<0.016) NQ (<0.016) Production Well CRABCREEK Well 2 10/30/2008 0.014 0.013 Production Well CRABCREEK Well 2 10/26/2009 ND(<0.0033 ) ND(<0.0033 ) Production Well CRABCREEK Well 3 1/7/2005 NQ (<0.050) NQ (<0.050) Production Well CRABCREEK Well 3 7/28/2005 0.015 0.015 Production Well CRABCREEK Well 3 12/13/2006 0.020 0.019 Production Well CRABCREEK Well 3 12/3/2007 0.025 0.024 Production Well CRABCREEK Well 3 10/30/2008 0.010 0.010 Production Well CRABCREEK Well 3 10/26/2009 0.019 0.018 Production Well CRABCREEK-PT 1/20/2009 0.015 0.014 Prior to Treatment Sample CRABCREEK-BED1-LEAD 1/20/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample

CRABCREEK-BED2-LAG 1/20/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample CRABCREEK-PT 2/23/2009 NQ (<0.013) NQ (<0.013) Prior to Treatment Sample CRABCREEK-BED1-LEAD 2/23/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample

CRABCREEK-BED2-LAG 2/23/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample CRABCREEK-PT 3/27/2009 NQ (<0.013) NQ (<0.013) Prior to Treatment Sample CRABCREEK-BED1-LEAD 3/27/2009 NQ (<0.013) NQ (<0.013) After Carbon Treatment Sample

CRABCREEK-BED2-LAG 3/27/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample CRABCREEK-PT 4/21/2009 NQ (<0.021) NQ (<0.021) Prior to Treatment Sample CRABCREEK-BED1-LEAD 4/21/2009 ND(<0.0043 ) ND(<0.0043 ) After Carbon Treatment Sample

CRABCREEK-BED2-LAG 4/21/2009 ND(<0.0043 ) ND(<0.0043 ) After Carbon Treatment Sample CRABCREEK-PT 5/13/2009 0.017 0.016 Prior to Treatment Sample CRABCREEK-BED1-LEAD 5/13/2009 NQ (<0.013) NQ (<0.013) After Carbon Treatment Sample

C RAB C REEK-BED 2 -LA G 5/13/2009 ND(<0.0026 ) ND(<0.0026 ) A f ter C arbon Treatment S ample

CRABCREEK-PT 6/24/2009 NQ (<0.013) NQ (<0.013) Prior to Treatment Sample CRABCREEK-BED1-LEAD 6/24/2009 NQ (<0.013) NQ (<0.013) After Carbon Treatment Sample

CRABCREEK-BED2-LAG 6/24/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample CRABCREEK-PT 7/22/2009 NQ (<0.013) NQ (<0.013) Prior to Treatment Sample CRABCREEK-BED1-LEAD 7/22/2009 NQ (<0.013) NQ (<0.013) After Carbon Treatment Sample

CRABCREEK-BED2-LAG 7/22/2009 NQ (<0.013) NQ (<0.013) After Carbon Treatment Sample CRABCREEK-PT 8/20/2009 NQ (<0.013) NQ (<0.013) Prior to Treatment Sample CRABCREEK-BED1-LEAD 8/20/2009 NQ (<0.013) NQ (<0.013) After Carbon Treatment Sample

CRABCREEK-BED2-LAG 8/20/2009 NQ (<0.013) NQ (<0.013) After Carbon Treatment Sample CRABCREEK-PT 9/22/2009 0.018 0.017 Prior to Treatment Sample CRABCREEK-BED2-LEAD 9/22/2009 NQ (<0.013) NQ (<0.013) After Carbon Treatment Sample

CRABCREEK-BED1-LAG 9/22/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample CRABCREEK-PT 10/26/2009 NQ (<0.016) NQ (<0.016) Prior to Treatment Sample CRABCREEK-BED2-LEAD 10/26/2009 ND(<0.0033 ) ND(<0.0033 ) After Carbon Treatment Sample

C RAB C REEK-BED 1 -LA G 10/26/2009 ND(<0.0033 ) ND(<0.0033 ) A f ter C arbon Treatment S ample



### 11/3/10 Page 40 of 48 Table 4.1

### Table 4.1 APFO and PFOA Results for Public Water Supply Sampling, West Virginia and Ohio Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Location Sample ID Sample Date A PFO (C-8) ug/ L PFOA ug/L* Comments Active Sampling Locations

CRABCREEK-PT 11/24/2009 NQ (<0.016) NQ (<0.016) Prior to Treatment Sample CRABCREEK-BED2-LEAD 11/24/2009 NQ (<0.016) NQ (<0.016) After Carbon Treatment Sample

CRABCREEK-BED1-LAG 11/24/2009 ND(<0.0033 ) ND(<0.0033 ) After Carbon Treatment Sample CRABCREEK-PT 12/17/2009 NQ (<0.016) NQ (<0.016) Prior to Treatment Sample CRABCREEK-BED2-LEAD 12/17/2009 NQ (<0.016) NQ (<0.016) After Carbon Treatment Sample

CRABCREEK-BED1-LAG 12/17/2009 ND(<0.0033 ) ND(<0.0033 ) After Carbon Treatment Sample CRABCREEK-PT 1/21/2010 NQ (<0.018) NQ (<0.018) Prior to Treatment Sample CRABCREEK-BED2-LEAD 1/21/2010 NQ (<0.018) NQ (<0.018) After Carbon Treatment Sample

CRABCREEK-BED1-LAG 1/21/2010 ND(<0.0035 ) ND(<0.0035 ) After Carbon Treatment Sample CRABCREEK-PT 2/22/2010 NQ (<0.018) NQ (<0.018) Prior to Treatment Sample CRABCREEK-BED2-LEAD 2/22/2010 NQ (<0.018) NQ (<0.018) After Carbon Treatment Sample

CRABCREEK-BED1-LAG 2/22/2010 ND(<0.0035 ) ND(<0.0035 ) After Carbon Treatment Sample CRABCREEK-PT 3/31/2010 NQ (<0.019) NQ (<0.019) Prior to Treatment Sample CRABCREEK-BED2-LEAD 3/31/2010 NQ (<0.019) NQ (<0.019) After Carbon Treatment Sample

CRABCREEK-BED1-LAG 3/31/2010 ND(<0.0038 ) ND(<0.0038 ) After Carbon Treatment Sample CRABCREEK-PT 4/28/2010 NQ (<0.019) NQ (<0.019) Prior to Treatment Sample CRABCREEK-BED2-LEAD 4/28/2010 NQ (<0.019) NQ (<0.019) After Carbon Treatment Sample

CRABCREEK-BED1-LAG 4/28/2010 ND(<0.0038 ) ND(<0.0038 ) After Carbon Treatment Sample CRABCREEK-PT 5/21/2010 NQ (<0.019) NQ (<0.019) Prior to Treatment Sample CRABCREEK-BED2-LEAD 5/21/2010 NQ (<0.019) NQ (<0.019) After Carbon Treatment Sample

CRABCREEK-BED1-LAG 5/21/2010 ND(<0.0038 ) ND(<0.0038 ) After Carbon Treatment Sample CRABCREEK-PT 6/22/2010 NQ (<0.019) NQ (<0.019) Prior to Treatment Sample CRABCREEK-BED2-LEAD 6/22/2010 NQ (<0.019) NQ (<0.019) After Carbon Treatment Sample

CRABCREEK-BED1-LAG 6/22/2010 NQ (<0.019) NQ (<0.019) After Carbon Treatment Sample CRABCREEK-PT 7/26/2010 NQ (<0.012) NQ (<0.012) Prior to Treatment Sample CRABCREEK-BED1-LEAD 7/26/2010 NQ (<0.012) NQ (<0.012) After Carbon Treatment Sample

CRABCREEK-BED2-LAG 7/26/2010 ND(<0.0025 ) ND(<0.0025 ) After Carbon Treatment Sample CRABCREEK-PT 8/23/2010 NQ (<0.012) NQ (<0.012) Prior to Treatment Sample CRABCREEK-BED1-LEAD 8/23/2010 NQ (<0.012) NQ (<0.012) After Carbon Treatment Sample

CRABCREEK-BED2-LAG 8/23/2010 ND(<0.0025 ) ND(<0.0025 ) After Carbon Treatment Sample LAKIN AT 10/29/2004 ND (<0.010) After Treatment Sample LAKIN AT 7/28/2005 ND (<0.001) ND (<0.001) After Treatment Sample LAKIN AT 12/13/2006 ND (<0.0018) ND (<0.0018) After Treatment Sample LAKIN AT 12/13/2006 (dup) ND (<0.0018) ND (<0.0018) After Treatment Sample LAKIN AT 12/3/2007 ND (<0.0031) ND (<0.0031) After Treatment Sample LAKIN AT 3/25/2008 ND (<0.0022) ND (<0.0022) After Treatment Sample LAKIN AT 6/16/2008 ND (<0.0019) ND (<0.0019) After Treatment Sample LAKIN AT 9/9/2008 ND (<0.0023) ND (<0.0023) After Treatment Sample LAKIN AT 10/30/2008 ND (<0.0017) ND (<0.0017) After Treatment Sample LAKIN AT 2/23/2009 ND (<0.0026) ND (<0.0026) After Treatment Sample LAKIN AT 4/21/2009 ND(<0.0026 ) ND(<0.0026 ) After Treatment Sample LAKIN AT 7/22/2009 ND(<0.0026 ) ND(<0.0026 ) After Treatment Sample LAKIN AT 10/26/2009 NQ (<0.016) NQ (<0.016) After Treatment Sample LAKIN AT 1/21/2010 ND(<0.0035 ) ND(<0.0035 ) After Treatment Sample LAKIN AT 4/28/2010 ND(<0.0038 ) ND(<0.0038 ) After Treatment Sample LAKIN AT 7/22/2010 ND(<0.0025 ) ND(<0.0025 ) After Treatment Sample LAKIN WELL 1 10/29/2004 ND (<0.010) Production Well LAKIN WELL 1 7/28/2005 ND (<0.001) ND (<0.001) Production Well LAKIN WELL 1 12/13/2006 ND (<0.0018) ND (<0.0018) Production Well LAKIN WELL 1 12/3/2007 ND (<0.0031) ND (<0.0031) Production Well LAKIN WELL 1 3/25/2008 ND (<0.0022) ND (<0.0022) Production Well LAKIN WELL 1 6/16/2008 ND (<0.0019) ND (0.0019) Production Well LAKIN WELL 1 6/16/08 (dup) ND (<0.0019) ND (0.0019) duplicate LAKIN WELL 1 9/9/2008 ND (<0.0023) ND (<0.0023) Production Well LAKIN WELL 1 10/30/2008 ND (<0.0017) ND (0.0017) Production Well LAKIN WELL 1 2/23/2009 ND (<0.0026) ND (0.0026) Production Well

LAKIN WELL 1 4/21/2009 ND(<0.0026 ) ND(<0.0026 ) Production Well LAKIN WELL 1 4/21/2009 (dup) ND(<0.0026 ) ND(<0.0026 ) duplicate LAKIN WELL 1 7/22/2009 ND(<0.0026 ) ND(<0.0026 ) Production Well



### 11/3/10 Page 41 of 48 Table 4.1

### Table 4.1 APFO and PFOA Results for Public Water Supply Sampling, West Virginia and Ohio Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Location Sample ID Sample Date A PFO (C-8) ug/ L PFOA ug/L* Comments Active Sampling Locations

LAKIN WELL 1 10/26/2009 ND(<0.0033 ) ND(<0.0033 ) Production Well LAKIN WELL 1 10/26/2009 (dup) ND(<0.0033 ) ND(<0.0033 ) duplicate LAKIN WELL 1 1/21/2010 ND(<0.0035 ) ND(<0.0035 ) Production Well LAKIN WELL 1 4/28/2010 ND(<0.0038 ) ND(<0.0038 ) Production Well LAKIN WELL 1 7/22/2010 ND(<0.0025 ) ND(<0.0025 ) Production Well LAKIN WELL 2 10/29/2004 ND (<0.010) Production Well LAKIN WELL 2 10/29/2004 (dup) ND (<0.010) duplicate LAKIN WELL 2 7/28/2005 ND (<0.001) ND (<0.001) Production Well LAKIN WELL 2 12/13/2006 ND (<0.0018) ND (<0.0018) Production Well LAKIN WELL 2 12/3/2007 ND (<0.0031) ND (<0.0031) Production Well LAKIN WELL 2 12/3/2007 (dup) ND (<0.0031) ND (<0.0031) Production Well LAKIN WELL 2 3/25/2008 ND (<0.0022) ND (<0.0022) Production Well LAKIN WELL 2 3/25/08 (dup) ND (<0.0022) ND (<0.0022) duplicate LAKIN WELL 2 6/16/2008 ND (<0.0019) ND (<0.0019) Production Well LAKIN WELL 2 9/9/2008 ND (<0.0023) ND (<0.0023) Production Well LAKIN WELL 2 10/30/2008 ND (<0.0017) ND (<0.0017) Production Well LAKIN WELL 2 10/30/08 (dup) ND (<0.0017) ND (<0.0017) duplicate LAKIN WELL 2 2/23/2009 ND (<0.0026) ND (<0.0026) Production Well LAKIN WELL 2 4/21/2009 ND(<0.0026 ) ND(<0.0026 ) Production Well LAKIN WELL 2 7/22/2009 ND(<0.0026 ) ND(<0.0026 ) Production Well LAKIN WELL 2 7/22/2009 (dup) ND(<0.0026 ) ND(<0.0026 ) duplicate LAKIN WELL 2 10/26/2009 ND(<0.0033 ) ND(<0.0033 ) Production Well LAKIN WELL 2 1/21/2010 ND(<0.0035 ) ND(<0.0035 ) Production Well LAKIN WELL 2 1/21/2010 (dup) ND(<0.0035 ) ND(<0.0035 ) Production Well-Dup LAKIN WELL 2 4/28/2010 ND(<0.0038 ) ND(<0.0038 ) Production Well LAKIN WELL 2-2 7/22/2010 ND(<0.0025 ) ND(<0.0025 ) Production Well-Dup

LAKIN WELL 2 7/22/2010 ND(<0.0025 ) ND(<0.0025 ) Production Well LAKIN WELL 3 10/29/2004 ND (<0.010) Production Well LAKIN WELL 3 7/28/2005 ND (<0.001) ND (<0.001) Production Well LAKIN WELL 3 12/13/2006 ND (<0.0018) ND (<0.0018) Production Well LAKIN WELL 3 3/25/2008 ND (<0.0022) ND (<0.0022) Production Well LAKIN WELL 3 6/16/2008 ND (<0.0019) ND (<0.0019) Production Well LAKIN WELL 3 9/9/2008 ND (<0.0023) ND (<0.0023) Production Well LAKIN WELL 3 9/9/08 (dup) ND (<0.0023) ND (<0.0023) duplicate LAKIN WELL 3 10/30/2008 ND (<0.0017) ND (<0.0017) Production Well LAKIN WELL 3 2/23/2009 ND (<0.0026) ND (<0.0026) Production Well LAKIN WELL 3 2/23/09 (dup) ND (<0.0026) ND (<0.0026) duplicate LAKIN WELL 3 4/21/2009 ND(<0.0026 ) ND(<0.0026 ) Production Well LAKIN WELL 3 7/22/2009 ND(<0.0026 ) ND(<0.0026 ) Production Well LAKIN WELL 3 10/26/2009 ND(<0.0033 ) ND(<0.0033 ) Production Well LAKIN WELL 3 1/21/2010 ND(<0.0035 ) ND(<0.0035 ) Production Well LAKIN WELL 3 4/28/2010 ND(<0.0038 ) ND(<0.0038 ) Production Well LAKIN WELL 3-2 4/28/2010 ND(<0.0038 ) ND(<0.0038 ) Production Well-Dup

LAKIN WELL 3 7/22/2010 ND(<0.0025 ) ND(<0.0025 ) Production Well LETART-PT 12/9/2008 0.018 0.017 Prior to Treatment Sample LETART-BED1-LEAD 12/9/2008 ND (<0.0017) ND (<0.0017) After Carbon Treatment Sample

LETART-BED2-LAG 12/9/2008 ND (<0.0017) ND (<0.0017) After Carbon Treatment Sample LETART-PT 1/20/2009 0.029 0.028 Prior to Treatment Sample LETART-BED1-LEAD 1/20/2009 NQ (<0.013) NQ (<0.013) After Carbon Treatment Sample

LETART-BED2-LAG 1/20/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample LETART-PT 2/23/2009 0.021 0.02 Prior to Treatment Sample LETART-BED1-LEAD 2/23/2009 NQ (<0.013) NQ (<0.013) After Carbon Treatment Sample

LETART-BED2-LAG 2/23/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample LETART-PT 3/27/2009 NQ (<0.013) NQ (<0.013) Prior to Treatment Sample LETART-BED1-LEAD 3/27/2009 NQ (<0.013) NQ (<0.013) After Carbon Treatment Sample

LETART-BED2-LAG 3/27/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample LETART-PT 4/21/2009 NQ (<0.021) NQ (<0.021) Prior to Treatment Sample LETART-BED1-LEAD 4/21/2009 NQ (<0.021) NQ (<0.021) After Carbon Treatment Sample

LETART-BED 2 -LA G 4/21/2009 ND(<0.0043 ) ND(<0.0043 ) A f ter C arbon Treatment S ample



### 11/3/10 Page 42 of 48 Table 4.1

### Table 4.1 APFO and PFOA Results for Public Water Supply Sampling, West Virginia and Ohio Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Location Sample ID Sample Date A PFO (C-8) ug/ L PFOA ug/L* Comments Active Sampling Locations

LETART-PT 5/13/2009 0.025 0.024 Prior to Treatment Sample LETART-BED1-LEAD 5/13/2009 0.014 0.013 After Carbon Treatment Sample

LETART-BED 2 -LA G 5/13/2009 ND(<0.0026 ) ND(<0.0026 ) A f ter C arbon Treatment S ample

LETART-PT 6/24/2009 NQ (<0.013) NQ (<0.013) Prior to Treatment Sample LETART-BED1-LEAD 6/24/2009 NQ (<0.013) NQ (<0.013) After Carbon Treatment Sample

LETART-BED2-LAG 6/24/2009 ND(<0.0026 ) ND(<0.0026 ) After Carbon Treatment Sample LETART-PT 7/22/2009 NQ (<0.024) NQ (<0.024) Prior to Treatment Sample LETART-BED1-LEAD 7/22/2009 NQ (<0.024) NQ (<0.024) After Carbon Treatment Sample

LETART-BED2-LAG 7/22/2009 NQ (<0.024) NQ (<0.024) After Carbon Treatment Sample LETART-PT 8/24/2009 NQ (<0.013) NQ (<0.013) Prior to Treatment Sample LETART-BED1-LEAD 8/24/2009 NQ (<0.013) NQ (<0.013) After Carbon Treatment Sample

LETART-BED2-LAG 8/24/2009 NQ (<0.013) NQ (<0.013) After Carbon Treatment Sample LETART-PT 9/22/2009 0.029 0.028 Prior to Treatment Sample LETART-BED1-LEAD 9/22/2009 0.019 0.018 After Carbon Treatment Sample

LETART-BED2-LAG 9/22/2009 NQ (<0.016) NQ (<0.016) After Carbon Treatment Sample LETART-PT 10/23/2009 0.019 0.018 Prior to Treatment Sample LETART-BED2-LEAD 10/23/2009 NQ (<0.016) NQ (<0.016) After Carbon Treatment Sample

LETART-BED1-LAG 10/23/2009 ND(<0.0033 ) ND(<0.0033 ) After Carbon Treatment Sample LETART-PT 11/24/2009 0.024 0.023 Prior to Treatment Sample LETART-BED2-LEAD 11/24/2009 0.019 0.018 After Carbon Treatment Sample

LETART-BED1-LAG 11/24/2009 ND(<0.0033 ) ND(<0.0033 ) After Carbon Treatment Sample LETART-PT 12/17/2009 0.022 0.021 Prior to Treatment Sample LETART-BED2-LEAD 12/17/2009 NQ (<0.016) NQ (<0.016) After Carbon Treatment Sample

LETART-BED1-LAG 12/17/2009 ND(<0.0033 ) ND(<0.0033 ) After Carbon Treatment Sample LETART-PT 1/21/2010 NQ (<0.018) NQ (<0.018) Prior to Treatment Sample LETART-BED2-LEAD 1/21/2010 NQ (<0.018) NQ (<0.018) After Carbon Treatment Sample

LETART-BED1-LAG 1/21/2010 ND(<0.0035 ) ND(<0.0035 ) After Carbon Treatment Sample LETART-PT 2/22/2010 0.024 0.023 Prior to Treatment Sample LETART-BED2-LEAD 2/22/2010 NQ (<0.018) NQ (<0.018) After Carbon Treatment Sample

LETART-BED1-LAG 2/22/2010 NQ (<0.018) NQ (<0.018) After Carbon Treatment Sample LETART-PT 3/31/2010 0.025 0.024 Prior to Treatment Sample LETART-BED1-LEAD 3/31/2010 NQ (<0.019) NQ (<0.019) After Carbon Treatment Sample

LETART-BED2-LAG 3/31/2010 ND(<0.0038 ) ND(<0.0038 ) After Carbon Treatment Sample LETART-PT 4/28/2010 NQ (<0.019) NQ (<0.019) Prior to Treatment Sample LETART-BED1-LEAD 4/28/2010 NQ (<0.019) NQ (<0.019) After Carbon Treatment Sample

LETART-BED2-LAG 4/28/2010 ND(<0.0038 ) ND(<0.0038 ) After Carbon Treatment Sample LETART-PT 5/21/2010 0.025 0.024 Prior to Treatment Sample LETART-BED1-LEAD 5/21/2010 NQ (<0.019) NQ (<0.019) After Carbon Treatment Sample

LETART-BED2-LAG 5/21/2010 ND(<0.0038 ) ND(<0.0038 ) After Carbon Treatment Sample LETART-PT 6/22/2010 0.023 0.022 Prior to Treatment Sample LETART-BED1-LEAD 6/22/2010 NQ (<0.019) NQ (<0.019) After Carbon Treatment Sample

LETART-BED2-LAG 6/22/2010 ND(<0.0038 ) ND(<0.0038 ) After Carbon Treatment Sample LETART-PT 7/22/2010 NQ (<0.012) NQ (<0.012) Prior to Treatment Sample LETART-BED1-LEAD 7/22/2010 NQ (<0.012) NQ (<0.012) After Carbon Treatment Sample

LETART-BED2-LAG 7/22/2010 ND(<0.0025 ) ND(<0.0025 ) After Carbon Treatment Sample LETART-PT 8/23/2010 NQ (<0.012) NQ (<0.012) Prior to Treatment Sample LETART-BED1-LEAD 8/23/2010 ND(<0.0025 ) ND(<0.0025 ) After Carbon Treatment Sample

LETART-BED2-LAG 8/23/2010 ND(<0.0025 ) ND(<0.0025 ) After Carbon Treatment Sample Racine Locks and Dam, WV RACINELD 1/4/2002 0.518 Miscellaneous Use RACINELD 9/17/2004 0.109 Miscellaneous Use RACINELD 7/28/2005 0.054 0.052 Miscellaneous Use Town of Mason TOMason Well 3 AT 1/7/2005 ND (<0.01) ND (<0.01) After Treatment Sample Town of Mason, cont. TOMason Well 3 AT 1/7/2005 ND (<0.01) ND (<0.01) Production Well

Point Pleasant, WV PPPSD PT 5/5/2005 ND (<0.001) ND (<0.001) Before Treatment Sample PPPSD AT 5/5/2005 ND (<0.001) ND (<0.001) After Treatment Sample PPPSDWell 1 5/5/2005 ND (<0.001) ND (<0.001) Production Well PPPSDWell 2 5/5/2005 ND (<0.001) ND (<0.001) Production Well PPPSDWell 3 5/5/2005 ND (<0.001) ND (<0.001) Production Well PPP S DWell 7 5/5/2005 ND (<0.001) ND (<0.001) Production Well



### 11/3/10 Page 43 of 48 Table 4.1

### Table 4.1 APFO and PFOA Results for Public Water Supply Sampling, West Virginia and Ohio Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Location Sample ID Sample Date A PFO (C-8) ug/ L PFOA ug/L* Comments Active Sampling Locations

Village of Pomeroy, OH VOPAT 3/26/2002 0.066 After Treatment Sample VOPAT 4/24/2002 0.063 After Treatment Sample VOPAT 9/23/2004 0.107 After Treatment Sample VPDECON Water 10/20/2005 NQ (<0.013) NQ (<0.013) After Treatment Sample VOPWELL1 4/24/2002 ND (<0.050) Production Well VOPWELL1 9/23/2004 ND (<0.010) Production Well VOPWELL1 9/22/2006 ND (<0.0026) ND (<0.0026) Production Well VOPWELL1 9/6/2007 ND (<0.0012) ND (<0.0012) Production Well VOPWELL1 9/26/2008 ND (<0.0017) ND (<0.0017) Production Well VOPWELL1 10/27/2009 ND(<0.0033 ) ND(<0.0033 ) Production Well VOPWELL2 3/26/2002 0.069 Production Well VOPWELL2 4/24/2002 ND (<0.050) Production Well V O PWELL 2 9/23/2004 0.705 Production Well VOPWELL2 2/3/2005 ND (<0.010) ND (<0.010) Production Well VOPWELL2 2/16/2005 ND (<0.010) ND (<0.010) Production Well VOPWELL2 9/22/2006 ND (<0.0026) ND (<0.0026) Production Well VOPWELL2 9/6/2007 ND (<0.0012) ND (<0.0012) Production Well VOPWELL2 9/26/2008 ND (<0.0017) ND (<0.0017) Production Well VOPWELL2 10/27/2009 ND(<0.0033 ) ND(<0.0033 ) Production Well VOPWELL4 3/26/2002 0.085 Production Well VOPWELL4 4/24/2002 0.071 Production Well VOPWELL4 9/23/2004 NQ (<0.050) Production Well VOPWELL4 9/22/2006 0.017 0.016 Production Well VOPWELL4 9/6/2007 0.0074 0.0071 Production Well VOPWELL4 9/6/2007 (dup) 0.0087 0.0084 Production Well VOPWELL4 9/26/2008 0.0090 0.0086 Production Well VOPWELL4 9/26/2008 (dup) 0.0093 0.0089 Production Well VOPWELL4 10/27/2009 NQ (<0.016) NQ (<0.016) Production Well VOPWELL4 10/27/2009 (dup) NQ (<0.016) NQ (<0.016) Production Well VOPWELL5 9/22/2006 ND (<0.0026) ND (<0.0026) Production Well VOPWELL5 9/6/2007 ND (<0.0012) ND (<0.0012) Production Well VOPWELL5 9/26/2008 NQ (<0.0085) NQ (<0.0085) Production Well POM-BACKWASH1 2/9/2006 ND (<0.0023) ND (<0.0023) NPDES Discharge Monitoring POM-BACKWASH1 4/14/2007 ND (<0.0027) ND (<0.0027) NPDES Discharge Monitoring POM-BACKWASH1 4/14/07 (dup) ND (<0.0027) ND (<0.0027) NPDES Discharge Monitoring POM-BACKWASH1 4/30/2008 ND (<0.0019) ND (<0.0019) NPDES Discharge Monitoring POM-BACKWASH1 4/30/08 (dup) ND (<0.0019) ND (<0.0019) NPDES Discharge Monitoring

POM-BACKWASH 1/29/2009 ND (<0.0026) ND (<0.0026) NPDES Discharge Monitoring POM-BACKWASH 1/29/09 (dup) ND (<0.0026) ND (<0.0026) NPDES Discharge Monitoring P O M-BA C KWA S H 10/21/2009 ND(<0.0021 ) ND(<0.0021 ) NPDES Discharge Monitoring POM-BACKWASH 10/21/2009 (dup) ND(<0.0021 ) ND(<0.0021 ) NPDES Discharge Monitoring

BWASH-VOP-2 9/15/2010 ND(<0.0025 ) ND(<0.0025 ) NPDES Discharge Monitoring-Du p

BWASH-VOP 9/15/2010 ND(<0.0025 ) ND(<0.0025 ) NPDES Discharge Monitoring

POM-STALL 4/29/2008 ND (<0.0019) ND (<0.0019) NPDES Discharge Monitoring POM-STALL 1/28/2009 0.018 0.017 NPDES Discharge Monitoring POM-INFLUEN T 2/22/2006 0.013 0.013 Prior to Treatment Sample POM-LEAD 2/22/2006 ND (<0.0023) ND (<0.0023) After Carbon Treatment Sample

POM-LAG 2/22/2006 ND (<0.0023) ND (<0.0023) After Carbon Treatment Sample

VOP-PT 5/9/2006 0.0139 0.0134 Prior to Treatment Sample VOP-BED1-LEAD 5/9/2006 NQ (<0.006) NQ (<0.006) After Carbon Treatment Sample

VOP-BED2-LAG 5/9/2006 ND (<0.0012) ND (<0.0012) After Carbon Treatment Sample VOP-BED1-LEAD 5/9/2006 (dup) NQ (<0.006) NQ (<0.006) After Carbon Treatment Sample VOP-PT 6/15/2006 0.0103 0.0099 Prior to Treatment Sample VOP-BED1-LEAD 6/15/2006 NQ (<0.006) NQ (<0.006) After Carbon Treatment Sample

VOP-BED2-LAG 6/15/2006 ND (<0.0012) ND (<0.0012) After Carbon Treatment Sample VOP-PT 7/27/2006 0.0167 0.0160 Prior to Treatment Sample VOP-BED1-LEAD 7/27/2006 NQ (<0.013) NQ (<0.013) After Carbon Treatment Sample

VOP-BED2-LAG 7/27/2006 ND (<0.0026) ND (<0.0026) After Carbon Treatment Sample VOP

- PT 8/18/2006 0.015 0.014 Prior to Treatment Sample



### 11/3/10 Page 44 of 48 Table 4.1

### Table 4.1 APFO and PFOA Results for Public Water Supply Sampling, West Virginia and Ohio Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Location Sample ID Sample Date A PFO (C-8) ug/ L PFOA ug/L* Comments Active Sampling Locations

VOP-BED1-LEAD 8/18/2006 NQ (<0.013) NQ (<0.013) After Carbon Treatment Sample

VOP-BED2-LAG 8/18/2006 ND (<0.0026) ND (<0.0026) After Carbon Treatment Sample VOP-PT 9/22/2006 0.017 0.016 Prior to Treatment Sample VOP-BED1-LEAD 9/22/2006 NQ (<0.013) NQ (<0.013) After Carbon Treatment Sample

VOP-BED2-LAG 9/22/2006 ND (<0.0026) ND (<0.0026) After Carbon Treatment Sample VOP-PT 10/12/2006 0.019 0.018 Prior to Treatment Sample VOP-BED1-LEAD 10/12/2006 0.011 0.011 After Carbon Treatment Sample

VOP-BED2-LAG 10/12/2006 ND (<0.0018) ND (<0.0018) After Carbon Treatment Sample VOP-PT 11/9/2006 NQ (<0.0090) NQ (<0.0090) Prior to Treatment Sample VOP-BED1-LEAD 11/9/2006 ND (<0.0018) ND (<0.0018) After Carbon Treatment Sample

VOP-BED2-LAG 11/9/2006 ND (<0.0018) ND (<0.0018) After Carbon Treatment Sample VOP-PT 12/18/2006 NQ (<0.0090) NQ (<0.0090) Prior to Treatment Sample VOP-BED1-LEAD 12/18/2006 NQ (<0.0090) NQ (<0.0090) After Carbon Treatment Sample

VOP-BED2-LAG 12/18/2006 ND (<0.0018) ND (<0.0018) After Carbon Treatment Sample VOP-PT 1/16/2007 0.022 0.021 Prior to Treatment Sample VOP-BED1-LEAD 1/16/2007 0.0082 0.0079 After Carbon Treatment Sample

VOP-BED2-LAG 1/16/2007 NQ (<0.0051) NQ (<0.0051) After Carbon Treatment Sample VOP-PT 2/15/2007 0.0068 0.0065 Prior to Treatment Sample VOP-BED1-LEAD 2/15/2007 0.0054 0.0052 After Carbon Treatment Sample

VOP-BED2-LAG 2/15/2007 NQ (<0.0051) NQ (<0.0051) After Carbon Treatment Sample VOP-PT 3/27/2007 ND (<0.0027) ND (<0.0027) Prior to Treatment Sample VOP-BED1-LEAD 3/27/2007 NQ (<0.013) NQ (<0.013) After Carbon Treatment Sample

VOP-BED2-LAG 3/27/2007 ND (<0.0027) ND (<0.0027) After Carbon Treatment Sample VOP-PT 6/20/2007 NQ (<0.0062) NQ (<0.0062) Prior to Treatment Sample VOP-BED1-LAG 6/20/2007 ND (<0.0012) ND (<0.0012) After Carbon Treatment Sample VOP-BED2-LEAD 6/20/2007 ND (<0.0012) ND (<0.0012) After Carbon Treatment Sample VOP-PT 9/6/2007 0.012 0.012 Prior to Treatment Sample VOP-BED1-LAG 9/6/2007 ND (<0.0012) ND (<0.0012) After Carbon Treatment Sample VOP-BED2-LEAD 9/6/2007 NQ (<0.0062) NQ (<0.0062) After Carbon Treatment Sample VOP-PT 12/4/2007 NQ (<0.016) NQ (<0.016) Prior to Treatment Sample VOP-BED1-LAG 12/4/2007 NQ (<0.016) NQ (<0.016) After Carbon Treatment Sample VOP-BED2-LEAD 12/4/2007 NQ (<0.016) NQ (<0.016) After Carbon Treatment Sample VOP-PT 3/13/2008 0.018 0.017 Prior to Treatment Sample VOP-BED1-LAG 3/13/2008 NQ (<0.011) NQ (<0.011) After Carbon Treatment Sample VOP-BED2-LEAD 3/13/2008 0.012 0.012 After Carbon Treatment Sample VOP-PT 6/18/2008 NQ (<0.0096) NQ (<0.0096) Prior to Treatment Sample VOP-BED1-LEAD 6/18/2008 NQ (<0.0096) NQ (<0.0096) After Carbon Treatment Sample

VOP-BED2-LAG 6/18/2008 ND (<0.0019) ND (<0.0019) After Carbon Treatment Sample VOP-PT 9/8/2008 NQ (<0.012) NQ (<0.012) Prior to Treatment Sample VOP-BED1-LEAD 9/8/2008 NQ (<0.012) NQ (<0.012) After Carbon Treatment Sample

VOP-BED2-LAG 9/8/2008 ND (<0.0023) ND (<0.0023) After Carbon Treatment Sample VOP-PT 12/16/2008 0.013 0.012 Prior to Treatment Sample VOP-BED1-LEAD 12/16/2008 0.010 0.010 After Carbon Treatment Sample

VOP-BED2-LAG 12/16/2008 NQ (<0.0085) NQ (<0.0085) After Carbon Treatment Sample VOP-PT 3/26/2009 NQ (<0.013) NQ (<0.013) Prior to Treatment Sample VOP-BED2-LEAD 3/26/2009 NQ (<0.013) NQ (<0.013) After Carbon Treatment Sample

VOP-BED1-LAG 3/26/2009 NQ (<0.013) NQ (<0.013) After Carbon Treatment Sample VOP-PT 5/13/2009 NQ (<0.013) NQ (<0.013) Prior to Treatment Sample VOP-BED2-LEAD 5/13/2009 NQ (<0.013) NQ (<0.013) After Carbon Treatment Sample

VOP-BED1-LAG 5/13/2009 NQ (<0.013) NQ (<0.013) After Carbon Treatment Sample VOP-PT 7/1/2009 NQ (<0.013) NQ (<0.013) Prior to Treatment Sample VOP-BED2-LEAD 7/1/2009 NQ (<0.013) NQ (<0.013) After Carbon Treatment Sample

VOP-BED1-LAG 7/1/2009 NQ (<0.013) NQ (<0.013) After Carbon Treatment Sample VOP-PT 8/24/2009 NQ (<0.013) NQ (<0.013) Prior to Treatment Sample VOP-BED2-LEAD 8/24/2009 NQ (<0.013) NQ (<0.013) After Carbon Treatment Sample

VOP-BED1-LAG 8/24/2009 NQ (<0.013) NQ (<0.013) After Carbon Treatment Sample VOP-PT 9/14/2009 NQ (<0.013) NQ (<0.013) Prior to Treatment Sample VOP-BED2-LEAD 9/14/2009 NQ (<0.013) NQ (<0.013) After Carbon Treatment Sample

V O P-BED 1 -LA G 9/14/2009 NQ (<0.013) NQ (<0.013) A f ter C arbon Treatment S ample



### 11/3/10 Page 45 of 48 Table 4.1

### Table 4.1 APFO and PFOA Results for Public Water Supply Sampling, West Virginia and Ohio Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Location Sample ID Sample Date A PFO (C-8) ug/ L PFOA ug/L* Comments Active Sampling Locations

VOP-PT 10/21/2009 NQ (<0.016) NQ (<0.016) Prior to Treatment Sample VOP-BED1-LEAD 10/21/2009 NQ (<0.016) NQ (<0.016) After Carbon Treatment Sample

VOP-BED2-LAG 10/21/2009 ND(<0.0033 ) ND(<0.0033 ) After Carbon Treatment Sample VOP-PT 3/8/2010 NQ (<0.018) NQ (<0.018) Prior to Treatment Sample VOP-BED1-LEAD 3/8/2010 NQ (<0.018) NQ (<0.018) After Carbon Treatment Sample

VOP-BED2-LAG 3/8/2010 NQ (<0.018) NQ (<0.018) After Carbon Treatment Sample VOP-PT 4/8/2010 NQ (<0.019) NQ (<0.019) Prior to Treatment Sample VOP-BED1-LEAD 4/8/2010 NQ (<0.019) NQ (<0.019) After Carbon Treatment Sample

VOP-BED2-LAG 4/8/2010 ND(<0.0038 ) ND(<0.0038 ) After Carbon Treatment Sample VOP-PT 5/10/2010 NQ (<0.019) NQ (<0.019) Prior to Treatment Sample VOP-BED1-LEAD 5/10/2010 NQ (<0.019) NQ (<0.019) After Carbon Treatment Sample

VOP-BED2-LAG 5/10/2010 ND(<0.0038 ) ND(<0.0038 ) After Carbon Treatment Sample VOP-PT 6/10/2010 NQ (<0.019) NQ (<0.019) Prior to Treatment Sample VOP-BED1-LEAD 6/10/2010 NQ (<0.019) NQ (<0.019) After Carbon Treatment Sample

VOP-BED2-LAG 6/10/2010 ND(<0.0038 ) ND(<0.0038 ) After Carbon Treatment Sample VOP-PT 7/8/2010 NQ (<0.012) NQ (<0.012) Prior to Treatment Sample VOP-BED1-LEAD 7/8/2010 NQ (<0.012) NQ (<0.012) After Carbon Treatment Sample

VOP-BED2-LAG 7/8/2010 NQ (<0.012) NQ (<0.012) After Carbon Treatment Sample VOP-PT 8/9/2010 NQ (<0.012) NQ (<0.012) Prior to Treatment Sample VOP-BED1-LEAD 8/9/2010 NQ (<0.012) NQ (<0.012) After Carbon Treatment Sample

VOP-BED2-LAG 8/9/2010 0.016 0.015 A f ter C arbon Treatment S ample



### 11/3/10 Page 46 of 48 Table 4.1

### Table 4.1 APFO and PFOA Results for Public Water Supply Sampling, West Virginia and Ohio Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Location Sample ID Sample Date A PFO (C-8) ug/L PFOA ug/L* Comments Parkersburg, WV PPSDPT 3/6/2002 NQ (<0.050) Before Treatment Sample PPSDPT 12/29/2005 0.085 0.082 Before Treatment Sample PPSDPT 3/2/2007 0.023 0.022 Before Treatment Sample PPSDAT 3/6/2002 NQ (<0.050) After Treatment Sample PPSDAT 4/25/2002 NQ (<0.050) After Treatment Sample PPSDAT 12/29/2005 0.068 0.065 After Treatment Sample PPSDAT 3/2/2007 0.027 0.026 After Treatment Sample PPSDRANY1 3/6/2002 0.069 Production Well PPSDRANY1 3/6/2002 0.069 duplicate PPSDRANY1 4/25/2002 0.075 Production Well PPSDRANY1 12/29/2005 0.109 0.105 Production Well PPSDRANY1 3/2/2007 0.086 0.083 Production Well PPSDRANY2 3/6/2002 ND (<0.010) Production Well PPSDRANY2 12/29/2005 0.028 0.026 Production Well PPSDRANY2 3/2/2007 0.0086 0.0083 Production Well PPSDRANY3 3/6/2002 ND (<0.010) Production Well PPSDRANY3 12/29/2005 0.046 0.044 Production Well PPSDRANY3 3/2/2007 0.041 0.039 Production Well PPSDRANY4 3/6/2002 ND (<0.010) Production Well PPSDRANY4 12/29/2005 NQ (<0.0086) NQ (<0.0086) Production Well PPSDRANY4 3/2/2007 0.0072 0.0069 Production Well PPSDRANY5 3/6/2002 ND (<0.010) Production Well PPSDRANY5 12/29/2005 NQ (<0.0086) NQ (<0.0086) Production Well PPSDRANY5 3/2/2007 NQ (<0.0051) NQ (<0.0051) Production Well General Electric, WV GE WELL 3 1/3/2002 1.780 Production Well GE WELL 3 1/3/2002 1.870 duplicate GE WELL 3 2/21/2002 1.750 Production Well GE WELL 3 4/26/2002 1.840 Production Well Belleville Hydra Plant, WV BELLEVILLELD 1/29/2002 NQ (<0.050) Miscellaneous Use Ravenswood Municipal, WV COR ASIN 3/27/2002 ND (<0.010) Air Stripper In COR ASOUT 3/27/2002 NQ (<0.050) Air Stripper Out COR BLEND AT 3/27/2002 ND (<0.010) Blend After Treatment COR WELL1 3/27/2002 ND (<0.010) Production Well COR WELL 2 3/27/2002 ND (<0.010) Production Well COR WELL3 3/27/2002 ND (<0.010) Production Well COR WELL 4 3/27/2002 ND (<0.010) Production Well COR WELL 5 3/27/2002 ND (<0.010) Production Well Village of Racine, OH VORAT 3/26/2002 ND (<0.010) After Treatment Sample VORAT 9/16/2004 ND (<0.010) After Treatment Sample VORRV3 3/26/2002 ND (<0.010) Production Well VORRV3 9/16/2004 ND (<0.010) Production Well VORWELL1 3/26/2002 ND (<0.010) Production Well VORWELL1 9/16/2004 ND (<0.010) Production Well VORWELL2 3/26/2002 ND (<0.010) Production Well VORWELL2 9/16/2004 ND (<0.010) Production Well New Haven Water Dept., WV NHPSDAT 4/10/2002 ND (<0.010) After Treatment Sample NHPSDPW1 4/10/2002 NQ (<0.050) Production Well NHPSDPW1 4/10/2002 (dup) NQ (<0.050) duplicate Village of Syracuse, OH VOSAT 3/29/2002 NQ (<0.050) After Treatment Sample VOSAT 4/24/2002 ND (<0.010) After Treatment Sample VOSAT 9/23/2004 ND (<0.010) After Treatment Sample VOSAT 9/23/04 (dup) ND (<0.010) duplicate VOS NORTH 2 3/29/2002 NQ (<0.050) Production Well VOS NORTH 2 4/24/2002 0.491 Production Well VOS NORTH 2 9/23/2004 ND (<0.010) Production Well VOS SOUTH R3 3/26/2002 0.208 Production Well VOS SOUTH R3 4/24/2002 ND (<0.010) Production Well VOS SOUTH R3 9/23/2004 NQ (<0.050) Production Well Marietta, OH PSD-WELLPT 6/26/2007 NQ (<0.0062) NQ (<0.0062) Before Treatment Sample PSD-WELL1 6/26/2007 0.013 0.012 Production Well PSD-WELL5 6/26/2007 NQ (<0.0062) NQ (<0.0062) Production Well PSD-WELL9 6/26/2007 0.018 0.017 Production Well PSD-WELL8 6/26/2007 0.0099 0.0097 Production Well PSD-WELL2 6/26/2007 NQ (<0.0062) NQ (<0.0062) Production Well PSD-WELL4 6/26/2007 NQ (<0.0062) NQ (<0.0062) Production Well PSD-WELLAT 6/26/2007 0.0079 0.0076 A fter Treatment Sample Historic Sampling Locations



### 11/3/10 Page 47 of 48 Table 4.1

### Table 4.1 APFO and PFOA Results for Public Water Supply Sampling, West Virginia and Ohio Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Location Sample ID Sample Date A PFO (C-8) ug/L PFOA ug/L* Comments Historic Sampling Locations

City of Vienna, WV VPSD WELL14 5/10/2007 0.060 0.058 Production Well

VPSD WELL13 5/10/2007 0.042 0.040 Production Well

VPSD WELL12 5/10/2007 0.079 0.076 Production Well

VPSD WELL11 5/10/2007 0.031 0.030 Production Well

VPSD WELL10 5/10/2007 0.041 0.039 Production Well

VPSD WELL9 5/10/2007 0.030 0.029 Production Well

VPSD WELL8 5/10/2007 0.049 0.047 Production Well

VPSD WELL7 5/10/2007 0.061 0.059 Production Well VPSD AT 5/10/2007 0.058 0.056 After Treatment Sample Warren, OH WarrenPSD-Well1 9/28/2007 ND (<0.0031) ND (<0.0031) Production Well WarrenPSD-Well2 9/28/2007 0.022 0.021 Production Well WarrenPSD-Well3 9/28/2007 ND (<0.0031) ND (<0.0031) Production Well

WarrenPSD-AT 9/28/2007 NQ (<0.016) NQ (<0.016) A fter Treatment Sample

* Both APFO (C-8) and PFOA are reported starting with the 4Q04 sampling event. ** New personnel conducted sampling starting with 2Q05 event and subsequently determined that samples from 2Q05 through 4Q05 that were identified as K16-PW01 were actually collected from L04-PW01. *** New personnel conducted sampling starting with 2Q05 event and subsequently determined that the incorrect sampling point was sampled from 2Q05 through 4Q05. **** Sample collected from concession stand sink faucet. Sampled just after the "big flood". Island still covered with thick layer of river sediments. Access to wellhouse may have been restricted. ^System 1/Well A - "Old System" consists of a typical pressure tank and submersible pump. Rudimentary sanitation equipment was present, but did not appear functional. This system is used to supply the superintendant's house (and any other misc. small demand needs) during the winter months. When System 1 is online, System 2 is inactive. ^^System 2/Well B - "New System" consists of (4) 150+ gallon pressure tanks operating in parallel which feed into a 2000 (appro x.) gallon steel storage tank. Sanitation equipment was not observed, but likely exists. This system is used to supply all water needs during spring, summer, and fall. It's primary advantage over system 1 is capacity. However, the system lacks freeze protection so it is shut down during the winter. When System 2 is online, System 1 is inactive. ND = Not Detected at or above the limit of detection (LOD). The listed LOD is approximate and varies by instrument and over ti me. NQ = Not Quantifiable. Detected at a level above the LOD and below the limit of quantification (LOQ). Misc. = Miscellaneous water use is not used for drinking. & L04-PW01 is also referred to as the Gallery well and V04-PW01 is also referred to as the Ranney well. West Well Field #1

is also referred to as West Field Well Header 1. @ Samples mislabeled in the field.



### 11/3/10 Page 48 of 48 Table 4.1

### Table 4.2 Residential GAC Systems, WV - Historic Data Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Location Sample Identification# Date APFO (ug/L) *PFOA (ug/L) **LOD (ug/L) **LOQ (ug/L) AbbottRL WWK-D-ABBOTT RL 12/11/2001 0.0606 0.01 0.05 WWK-D-ABBOTT RL 4/11/2002 NQ 0.01 0.05 AbbottS WWK-D-ABBOTT S 12/12/2001 0.22 0.01 0.05 WWK-D-ABBOTT S 4/11/2002 0.422 0.01 0.05

DRL-D-ABBOTTS 6/28/2004 0.435 0.01 0.05 DRL-D-ABBOTT S 9/20/2004 0.563 0.01 0.05 DRL-D-ABBOTT S 12/2/2004 0.581 0.558 0.01 0.05 DRL-D-ABBOTT S 1/24/2005 0.344 0.331 0.01 0.05 DRL-D-ABBOTT S 4/20/2005 0.413 0.397 0.01 0.05 DRL-D-ABBOTT S 7/13/2005 0.318 0.306 0.0015 0.0073 DRL-D-ABBOTT S 10/12/2005 0.423 0.406 0.0022 0.011 1556ClubDr WWK-D-ALHEART R 12/19/2001 2.8 0.01 0.05 AtkinsonJR WWK-D-ATKINSON J2 1/9/2002 0.149 0.01 0.05 WWK-D-ATKINSON J2 4/12/2002 0.264 0.01 0.05 CraftS LTL-D-16727 8/30/2005 0.0512 0.0492 0.0015 0.0073 DeuleyPE LCL-D-1014971 12/30/2004 0.0622 0.0597 0.01 0.05 GatesKC WWK-D-1018224 1/12/2006 0.0677 0.065 0.002 0.01 GrimmR WWK-D-GRIMM R 12/11/2001 <0.05 0.01 0.05 MooreR DRL-D-11645 12/22/2004 0.119 0.114 0.01 0.05 NayJL WWK-D-NAY JL 3/19/2002 0.465 0.01 0.05 LCL-D-NAY JL 12/2/2004 0.676 0.649 0.01 0.05 LCL-D-NAY JL 1/21/2005 0.328 0.315 0.01 0.05 LCL-D-NAY JL 4/20/2005 0.473 0.454 0.01 0.05 LCL-D-NAY JL 7/12/2005 0.397 0.381 0.0015 0.0073 LCL-D-NAY JL 10/11/2005 0.573 0.55 0.0022 0.011 NicholsonDH WWK-D-NICHOLSON DH 12/11/2001 0.0505 0.01 0.05 DRL-D-NICHOLSONDH 6/23/2004 0.143 0.01 0.05 DRL-D-NICHOLSON DH 9/16/2004 0.137 0.01 0.05 DRL-D-NICHOLSON DH 12/2/2004 0.152 0.146 0.01 0.05 DRL-D-NICHOLSON DH 1/27/2005 0.085 0.0817 0.01 0.05 DRL-D-NICHOLSON DH 4/20/2005 0.146 0.14 0.01 0.05 DRL-D-NICHOLSON DH 7/18/2005 0.0958 0.0921 0.0015 0.0073 DRL-D-NICHOLSON DH 10/14/2005 0.144 0.138 0.0022 0.011 ParkerJL WWK-D-PARKER JL 12/10/2001 0.177 0.01 0.05 RoushE WWK-D-16761 10/4/2005 0.0952 0.0914 0.0007 0.0035 Rt1Box14 WWK-D-CHRISTMAN 12/21/2001 0.328 0.01 0.05 WWK-D-CHRISTMAN S 4/11/2002 0.526 0.01 0.05 SmithG LCL-D-15698 2/4/2005 0.475 0.456 0.01 0.05 SummersA DRL-D-11651 12/21/2004 0.0565 0.0543 0.01 0.05 SweseyJW DRL-D-1011126 12/22/2004 0.0761 0.0731 0.01 0.05 VincentS WWK-D-VINCENT S 12/17/2001 1.11 0.01 0.05 WWK-D-VINCENT S 4/11/2002 1.36 0.01 0.05 WilcoxA WWK-D-WILCOX A 1/28/2002 1.72 0.01 0.05 WWK-D-WILCOX A 4/11/2002 1.74 0.01 0.05 WinansJ LCL-D-1674 9 9/2/2005 2.41 2.31 0.015 0.073

#Sample nomenclature may not be consistent over time. However, all samples have been checked to verify that they are from the same location. *Both PFOA and APFO were reported starting with the 4Q04 sampling events. **Starting in July 2005, Limit of Detection (LOD) and Limit of Quantitiation (LOQ) were determined on at least a quarterly basis using the signal to noise determination described in the Phase II QAPP. NQ = Not quantifiable. Detected at a concentration above the LOD and below the LOQ.

11/3/10 Page 1 of 1 Table 4.2

### Table 4.3 Residential Treatment Results, West Virginia - GAC System Samples Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

RESIDENT SAMPLE_NUMBER DATESMPL APFO (ug/L) PFOA (ug/L) *LOD (ug/L) *LOQ (ug/L) AbbottRL WWK-D-ABBOTTRL-PT 9/3/2010 0.049 0.047 0.0025 0.012 WWK-D-ABBOTTRL-BED1 9/3/2010 <0.0025 <0.0025 0.0025 0.012 WWK-D-ABBOTTRL-BED1 5/25/2010 <0.0038 <0.0038 0.0038 0.019 WWK-D-ABBOTTRL-BED1 3/15/2010 <0.0035 <0.0035 0.0035 0.018 WWK-D-ABBOTTRL-BED1 12/14/2009 <0.0033 <0.0033 0.0033 0.016

WWK-D-ABBOTTRL-PT 9/10/2009 0.035 0.034 0.0026 0.013 WWK-D-ABBOTTRL-BED1 9/10/2009 <0.0026 <0.0026 0.0026 0.013 WWK-D-ABBOTTRL-BED1 6/11/2009 <0.0026 <0.0026 0.0026 0.013 WWK-D-ABBOTTRL-BED1 3/17/2009 <0.0026 <0.0026 0.0026 0.013 WWK-D-ABBOTTRL-BED1 11/24/2008 <0.0017 <0.0017 0.0017 0.0085

WWK-D-ABBOTTRL-PT 9/3/2008 0.034 0.033 0.0023 0.012 WWK-D-ABBOTTRL-BED1 9/3/2008 <0.0023 <0.0023 0.0023 0.012 WWK-D-ABBOTTRL-BED1 6/24/2008 <0.0023 <0.0023 0.0023 0.012 WWK-D-ABBOTTRL-BED1 3/3/2008 <0.0022 <0.0022 0.0022 0.011 WWK-D-ABBOTTRL-BED1 11/27/2007 <0.0031 <0.0031 0.0031 0.016

WWK-D-ABBOTTRL-PT 8/20/2007 0.015 0.015 0.0012 0.0062 WWK-D-ABBOTTRL-BED1 8/20/2007 NQ NQ 0.0012 0.0062 WWK-D-ABBOTTRL-BED2 8/20/2007 <0.0012 <0.0012 0.0012 0.0062 WWK-D-ABBOTTRL-BED1 6/11/2007 <0.0027 <0.0027 0.0027 0.013 WWK-D-ABBOTTRL-BED1 2/21/2007 <0.0010 <0.0010 0.0010 0.0051 WWK-D-ABBOTTRL-BED1 10/31/2006 <0.0018 <0.0018 0.0018 0.0090 WWK-D-ABBOTTRL-BED1 8/9/2006 <0.0016 <0.0016 0.0016 0.0078

WWK-D-ABBOTTRL-PT 5/10/2006 0.0303 0.0291 0.0012 0.006 WWK-D-ABBOTTRL-BED1 5/10/2006 <0.0012 <0.0012 0.0012 0.006 AbbottS WWK-D-ABBOTTS-BED1 5/27/2010 <0.0038 <0.0038 0.0038 0.019 WWK-D-ABBOTTS-BED1 3/15/2010 <0.0035 <0.0035 0.0035 0.018 WWK-D-ABBOTTS-BED1 12/16/2009 <0.0033 <0.0033 0.0033 0.016

WWK-D-ABBOTTS-PT 9/11/2009 0.29 0.28 0.0026 0.013 WWK-D-ABBOTTS-BED1 9/11/2009 <0.0026 <0.0026 0.0026 0.013 WWK-D-ABBOTTS-BED1 6/12/2009 <0.0026 <0.0026 0.0026 0.013 WWK-D-ABBOTTS-BED1 3/27/2009 <0.0026 <0.0026 0.0026 0.013 WWK-D-ABBOTTS-BED1 12/19/2008 <0.0017 <0.0017 0.0017 0.0085

WWK-D-ABBOTTS-PT 9/25/2008 0.28 0.27 0.0017 0.0085 WWK-D-ABBOTTS-BED1 9/25/2008 <0.0017 <0.0017 0.0017 0.0085 WWK-D-ABBOTTS-BED1 6/28/2008 <0.0023 <0.0023 0.0023 0.012 WWK-D-ABBOTTS-BED1 3/21/2008 <0.0019 <0.0019 0.0019 0.0096 WWK-D-ABBOTTS-BED1 12/15/2007 <0.0031 <0.0031 0.0031 0.016

WWK-D-ABBOTTS-PT 8/31/2007 0.28 0.27 0.0012 0.0062 WWK-D-ABBOTTS-BED1 8/31/2007 <0.0012 <0.0012 0.0012 0.0062 WWK-D-ABBOTTS-BED1 6/15/2007 <0.0027 <0.0027 0.0027 0.013 WWK-D-ABBOTTS-BED1 2/21/2007 <0.0010 <0.0010 0.0010 0.0051 WWK-D-ABBOTTS-BED1 11/1/2006 <0.0018 <0.0018 0.0018 0.0090 WWK-D-ABBOTTS-BED1 8/9/2006 <0.0016 <0.0016 0.0016 0.0078 WWK-D-ABBOTTLW-PT 5/10/2006 0.47 0.452 0.0012 0.006 WWK-D-ABBOTTLW-BED1 5/10/2006 <0.0012 <0.0012 0.0012 0.006 AlkireM WWK-D-1556CLUBDR-BED1 5/27/2010 <0.0038 <0.0038 0.0038 0.019 WWK-D-1556CLUBDR-BED1 3/16/2010 <0.0035 <0.0035 0.0035 0.018 WWK-D-1556CLUBDR-BED1 12/16/2009 <0.0033 <0.0033 0.0033 0.016

WWK-D-1556CLUBDR-PT 9/14/2009 1.9 1.8 0.026 0.13 WWK-D-1556CLUBDR-BED1 9/14/2009 <0.0026 <0.0026 0.0026 0.013 WWK-D-1556CLUBDR-BED1 6/16/2009 <0.0026 <0.0026 0.0026 0.013 WWK-D-1556CLUBDR-BED1 3/18/2009 <0.0026 <0.0026 0.0026 0.013

11/3/10 Page 1 of 9 Table 4.3

### Table 4.3 Residential Treatment Results, West Virginia - GAC System Samples Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

RESIDENT SAMPLE_NUMBER DATESMPL APFO (ug/L) PFOA (ug/L) *LOD (ug/L) *LOQ (ug/L)

WWK-D-1556CLUBDR-BED1 11/26/2008 <0.0017 <0.0017 0.0017 0.0085

WWK-D-1556CLUBDR-PT 9/3/2008 2.0 1.9 0.023 0.12 WWK-D-1556CLUBDR-BED1 9/3/2008 <0.0023 <0.0023 0.0023 0.012 WWK-D-1556CLUBDR-BED1 6/30/2008 <0.0023 <0.0023 0.0023 0.012 WWK-D-AHARTRE-PT 8/22/2007 1.4 1.3 0.012 0.062 WWK-D-AHARTRE-BED1 8/22/2007 <0.0012 <0.0012 0.0012 0.0062 WWK-D-AHARTRE-BED1 6/11/2007 <0.0027 <0.0027 0.0027 0.013 WWK-D-AHARTRE-BED1 2/27/2007 <0.0010 <0.0010 0.0010 0.0051 WWK-D-AHARTRE-BED1 11/1/2006 <0.0018 <0.0018 0.0018 0.0090 WWK-D-AHARTRE-BED1 8/10/2006 <0.0016 <0.0016 0.0016 0.0078

WWK-D-AHARTRE-PT 5/10/2006 2.09 2.01 0.012 0.06 WWK-D-AHARTRE-BED1 5/10/2006 <0.0012 <0.0012 0.0012 0.006 AtkinsonJR WWK-D-ATKINSONJR-PT 9/3/2010 0.42 0.40 0.0025 0.012 WWK-D-ATKINSONJR-BED1 9/3/2010 <0.0025 <0.0025 0.0025 0.012 WWK-D-ATKINSONJR-BED1 5/27/2010 <0.0038 <0.0038 0.0038 0.019 WWK-D-ATKINSONJR-BED1 3/15/2010 <0.0035 <0.0035 0.0035 0.018 WWK-D-ATKINSONJR-BED1 12/14/2009 <0.0033 <0.0033 0.0033 0.016

WWK-D-ATKINSONJR-PT 9/10/2009 0.32 0.31 0.0026 0.013 WWK-D-ATKINSONJR-BED1 9/10/2009 <0.0026 <0.0026 0.0026 0.013 WWK-D-ATKINSONJR-BED1 6/11/2009 <0.0026 <0.0026 0.0026 0.013 WWK-D-ATKINSONJR-BED1 3/17/2009 <0.0026 <0.0026 0.0026 0.013 WWK-D-ATKINSONJR-BED1 11/24/2008 <0.0017 <0.0017 0.0017 0.0085

WWK-D-ATKINSONJR-PT 9/3/2008 0.36 0.35 0.0023 0.012 WWK-D-ATKINSONJR-BED1 9/3/2008 <0.0023 <0.0023 0.0023 0.012 WWK-D-ATKINSONJR-BED1 6/24/2008 <0.0023 <0.0023 0.0023 0.012 WWK-D-ATKINSONJR-BED1 3/4/2008 <0.0022 <0.0022 0.0022 0.011 WWK-D-ATKINSONJR-BED1 11/27/2007 <0.0031 <0.0031 0.0031 0.016

WWK-D-ATKINSONJR-PT 8/20/2007 0.23 0.22 0.0012 0.0062 WWK-D-ATKINSONJR-BED1 8/20/2007 <0.0012 <0.0012 0.0012 0.0062 WWK-D-ATKINSONJR-BED1 6/11/2007 <0.0027 <0.0027 0.0027 0.013 WWK-D-ATKINSONJR-BED1 2/21/2007 <0.0010 <0.0010 0.0010 0.0051 WWK-D-ATKINSONJR-BED1 11/1/2006 <0.0018 <0.0018 0.0018 0.0090

WWK-D-ATKINSONJR-PT 9/29/2006 0.21 0.20 0.0018 0.009 WWK-D-ATKINSONJR-BED1 9/29/2006 <0.0018 <0.0018 0.0018 0.009 CraftS WWK-D-CRAFTS-BED1 5/21/2010 <0.0038 <0.0038 0.0038 0.019 WWK-D-CRAFTS-BED1 3/18/2010 <0.0035 <0.0035 0.0035 0.018 WWK-D-CRAFTS-BED1 12/17/2009 <0.0033 <0.0033 0.0033 0.016

WWK-D-CRAFTS-PT 9/10/2009 0.047 0.045 0.0026 0.013 WWK-D-CRAFTS-BED1 9/10/2009 <0.0026 <0.0026 0.0026 0.013 WWK-D-CRAFTS-BED1 6/16/2009 NQ NQ 0.0026 0.013 WWK-D-CRAFTS-BED2 6/16/2009 <0.0026 <0.0026 0.0026 0.013 WWK-D-CRAFTS-BED1 3/19/2009 NQ NQ 0.0026 0.013 WWK-D-CRAFTS-BED2 3/19/2009 <0.0026 <0.0026 0.0026 0.013 WWK-D-CRAFTS-BED1 11/12/2008 <0.0017 <0.0017 0.0017 0.0085

WWK-D-CRAFTS-PT 9/16/2008 0.049 0.047 0.0023 0.012 WWK-D-CRAFTS-BED1 9/16/2008 <0.0023 <0.0023 0.0023 0.012 WWK-D-CRAFTS-BED1 6/16/2008 <0.0019 <0.0019 0.0019 0.0096 WWK-D-CRAFTS-BED1 3/25/2008 <0.0019 <0.0019 0.0019 0.0096 WWK-D-CRAFTS-BED1 12/3/2007 <0.0031 <0.0031 0.0031 0.016

WWK-D-CRAFTS-PT 8/23/2007 0.031 0.030 0.0012 0.0062 WWK-D-CRAFTS-BED1 8/23/2007 NQ NQ 0.0012 0.0062 WWK-D-CRAFTS-BED2 8/23/2007 <0.0012 <0.0012 0.0012 0.0062

11/3/10 Page 2 of 9 Table 4.3

### Table 4.3 Residential Treatment Results, West Virginia - GAC System Samples Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

RESIDENT SAMPLE_NUMBER DATESMPL APFO (ug/L) PFOA (ug/L) *LOD (ug/L) *LOQ (ug/L)

WWK-D-CRAFTS-BED1 6/13/2007 <0.0027 <0.0027 0.0027 0.013 WWK-D-CRAFTS-BED1 2/28/2007 <0.0010 <0.0010 0.0010 0.0051 WWK-D-CRAFTS-BED1 12/13/2006 <0.0018 <0.0018 0.0018 0.0090 WWK-D-CRAFTS-BED1 8/11/2006 <0.0026 <0.0026 0.0026 0.013

WWK-D-CRAFTS-PT 6/14/2006 0.0243 0.0233 0.0012 0.006 WWK-D-CRAFTS-BED1 6/14/2006 <0.0012 <0.0012 0.0012 0.006 DeuleyPE WWK-D-DEULEYPE-BED1 6/24/2010 <0.0025 <0.0025 0.0025 0.012 WWK-D-DEULEYPE-BED1 3/26/2010 <0.0038 <0.0038 0.0038 0.019 WWK-D-DEULEYPE-BED1 12/16/2009 <0.0033 <0.0033 0.0033 0.016

WWK-D-DEULEYPE-PT 9/14/2009 0.088 0.085 0.0026 0.013 WWK-D-DEULEYPE-BED1 9/14/2009 <0.0026 <0.0026 0.0026 0.013 WWK-D-DEULEYPE-BED1 6/15/2009 <0.0026 <0.0026 0.0026 0.013 WWK-D-DEULEYPE-BED1 3/23/2009 <0.0043 <0.0043 0.0043 0.021 WWK-D-DEULEYPE-BED1 11/26/2008 <0.0017 <0.0017 0.0017 0.0085

WWK-D-DEULEYPE-PT 9/15/2008 0.098 0.094 0.0023 0.012 WWK-D-DEULEYPE-BED1 9/15/2008 <0.0023 <0.0023 0.0023 0.012 WWK-D-DEULEYPE-BED1 6/24/2008 <0.0023 <0.0023 0.0023 0.012 WWK-D-DEULEYPE-BED1 3/24/2008 <0.0019 <0.0019 0.0019 0.0096 WWK-D-DEULEYPE-BED1 12/15/2007 <0.0031 <0.0031 0.0031 0.016

WWK-D-DEULEYPE-PT 8/30/2007 0.059 0.057 0.0012 0.0062 WWK-D-DEULEYPE-BED1 8/30/2007 <0.0012 <0.0012 0.0012 0.0062 WWK-D-DEULEYPE-BED1 6/12/2007 <0.0027 <0.0027 0.0027 0.013 WWK-D-DEULEYPE-BED1 3/1/2007 <0.0010 <0.0010 0.0010 0.0051 WWK-D-DEULEYPE-BED1 11/1/2006 <0.0018 <0.0018 0.0018 0.0090 WWK-D-DEULEYPE-BED1 8/10/2006 <0.0016 <0.0016 0.0016 0.0078

WWK-D-DEULEYPE-PT 5/10/2006 0.0894 0.0859 0.0012 0.006 WWK-D-DEULEYPE-BED1 5/10/2006 <0.0012 <0.0012 0.0012 0.006 GatesKC WWK-D-GATESKC-PT 9/3/2010 0.077 0.074 0.0025 0.012 WWK-D-GATESKC-BED1 9/3/2010 <0.0025 <0.0025 0.0025 0.012 WWK-D-GATESKC-BED1 5/26/2010 <0.0038 <0.0038 0.0038 0.019 WWK-D-GATESKC-BED1 3/15/2010 <0.0035 <0.0035 0.0035 0.018 WWK-D-GATESKC-BED1 12/14/2009 <0.0033 <0.0033 0.0033 0.016

WWK-D-GATESKC-PT 9/11/2009 0.039 0.037 0.0026 0.013 WWK-D-GATESKC-BED1 9/11/2009 <0.0026 <0.0026 0.0026 0.013 WWK-D-GATESKC-BED1 6/12/2009 <0.0026 <0.0026 0.0026 0.013 WWK-D-GATESKC-BED1 3/17/2009 <0.0026 <0.0026 0.0026 0.013 WWK-D-GATESKC-BED1 11/24/2008 <0.0017 <0.0017 0.0017 0.0085

WWK-D-GATESKC-PT 9/3/2008 0.065 0.062 0.0023 0.012 WWK-D-GATESKC-BED1 9/3/2008 <0.0023 <0.0023 0.0023 0.012 WWK-D-GATESKC-BED1 6/24/2008 <0.0023 <0.0023 0.0023 0.012 WWK-D-GATESKC-BED1 3/3/2008 <0.0022 <0.0022 0.0022 0.011 WWK-D-GATESKC-BED1 11/27/2007 <0.0031 <0.0031 0.0031 0.016

WWK-D-GATESKC-PT 8/20/2007 0.044 0.043 0.0012 0.0062 WWK-D-GATESKC-BED1 8/20/2007 <0.0012 <0.0012 0.0012 0.0062 WWK-D-GATESKC-BED1 6/11/2007 <0.0027 <0.0027 0.0027 0.013 WWK-D-GATESKC-BED1 2/27/2007 <0.0010 <0.0010 0.0010 0.0051 WWK-D-GATESKC-BED1 10/31/2006 <0.0018 <0.0018 0.0018 0.0090 WWK-D-GATESKC-BED1 8/8/2006 <0.0016 <0.0016 0.0016 0.0078 WWK-D-GATESKC-BED1-2 8/8/2006 <0.0016 <0.0016 0.0016 0.0078 WWK-D-GATESKC-PT 5/25/2006 0.0368 0.0354 0.0012 0.006 WWK-D-GATESKC-PT-2 5/25/2006 0.0348 0.0334 0.0012 0.006 WWK-D-GATESKC-BED1 5/25/2006 <0.0012 <0.0012 0.0012 0.006

11/3/10 Page 3 of 9 Table 4.3

### Table 4.3 Residential Treatment Results, West Virginia - GAC System Samples Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

RESIDENT SAMPLE_NUMBER DATESMPL APFO (ug/L) PFOA (ug/L) *LOD (ug/L) *LOQ (ug/L)

GrimmR WWK-D-GRIMMR-BED1 5/21/2010 <0.0038 <0.0038 0.0038 0.019 WWK-D-GRIMMR-BED1 3/17/2010 <0.0035 <0.0035 0.0035 0.018 WWK-D-GRIMMR-BED1 12/17/2009 <0.0033 <0.0033 0.0033 0.016

WWK-D-GRIMMR-PT 9/10/2009 <0.0026 <0.0026 0.0026 0.013 WWK-D-GRIMMR-BED1 9/10/2009 <0.0026 <0.0026 0.0026 0.013 WWK-D-GRIMMR-BED1 6/16/2009 <0.0026 <0.0026 0.0026 0.013 WWK-D-GRIMMR-BED1 3/19/2009 <0.0026 <0.0026 0.0026 0.013 WWK-D-GRIMMR-BED1 11/12/2008 <0.0017 <0.0017 0.0017 0.0085

WWK-D-GRIMMR-PT 9/16/2008 <0.0023 <0.0023 0.0023 0.012 WWK-D-GRIMMR-BED1 9/16/2008 <0.0023 <0.0023 0.0023 0.012 WWK-D-GRIMMR-BED1 6/16/2008 <0.0019 <0.0019 0.0019 0.0096 WWK-D-GRIMMR-BED1 3/7/2008 <0.0022 <0.0022 0.0022 0.011 WWK-D-GRIMMR-BED1 12/3/2007 <0.0031 <0.0031 0.0031 0.016 WWK-D-GRIMMR-BED1-2 12/3/2007 <0.0031 <0.0031 0.0031 0.016 WWK-D-GRIMMR-PT 8/23/2007 <0.0012 <0.0012 0.0012 0.0062 WWK-D-GRIMMR-BED1 8/23/2007 <0.0012 <0.0012 0.0012 0.0062 WWK-D-GRIMMR-BED1 6/13/2007 <0.0027 <0.0027 0.0027 0.013 WWK-D-GRIMMR-BED1 2/28/2007 <0.0010 <0.0010 0.0010 0.0051 WWK-D-GRIMMR-BED1 12/13/2006 <0.0018 <0.0018 0.0018 0.0090 WWK-D-GRIMMR-BED1 8/11/2006 <0.0026 <0.0026 0.0026 0.013 WWK-D-GRIMMRR-PT 5/18/2006 NQ NQ 0.0012 0.006 WWK-D-GRIMMRR-BED1 5/18/2006 <0.0012 <0.0012 0.0012 0.006 MooreR WWK-D-MOORER-BED1 5/26/2010 <0.0038 <0.0038 0.0038 0.019 WWK-D-MOORER-BED1 3/23/2010 <0.0035 <0.0035 0.0035 0.018 WWK-D-MOORER-BED1 12/15/2009 <0.0033 <0.0033 0.0033 0.016

WWK-D-MOORER-PT 9/11/2009 0.10 0.097 0.0026 0.013 WWK-D-MOORER-BED1 9/11/2009 <0.0026 <0.0026 0.0026 0.013 WWK-D-MOORER-BED1 6/12/2009 <0.0026 <0.0026 0.0026 0.013 WWK-D-MOORER-BED1 3/18/2009 <0.0026 <0.0026 0.0026 0.013 WWK-D-MOORER-BED1 11/24/2008 <0.0017 <0.0017 0.0017 0.0085

WWK-D-MOORER-PT 9/11/2008 0.10 0.098 0.0023 0.012 WWK-D-MOORER-BED1 9/11/2008 <0.0023 <0.0023 0.0023 0.012 WWK-D-MOORER-BED1 6/23/2008 <0.0023 <0.0023 0.0023 0.012 WWK-D-MOORER-BED1 3/3/2008 <0.0022 <0.0022 0.0022 0.011 WWK-D-MOORER-BED1 11/29/2007 <0.0031 <0.0031 0.0031 0.016

WWK-D-MOORER-PT 8/28/2007 0.036 0.035 0.0012 0.0062 WWK-D-MOORER-BED1 8/28/2007 <0.0012 <0.0012 0.0012 0.0062 WWK-D-MOORER-BED1 6/11/2007 <0.0027 <0.0027 0.0027 0.013 WWK-D-MOORER-BED1 2/28/2007 <0.0010 <0.0010 0.0010 0.0051 WWK-D-MOORER-BED1 10/31/2006 <0.0018 <0.0018 0.0018 0.0090 WWK-D-MOORER-BED1 8/9/2006 <0.0016 <0.0016 0.0016 0.0078

WWK-D-MOORER-PT 6/21/2006 0.113 0.108 0.0026 0.013 WWK-D-MOORER-BED1 6/21/2006 <0.0026 <0.0026 0.0026 0.013 NayJL WWK-D-NAYJL-PT 9/3/2010 1.0 1.0 0.025 0.12 WWK-D-NAYJL-BED1 9/3/2010 <0.0025 <0.0025 0.0025 0.012 WWK-D-NAYJL-BED1 6/23/2010 <0.0038 <0.0038 0.0038 0.019 WWK-D-NAYJL-BED1 3/15/2010 <0.0035 <0.0035 0.0035 0.018 WWK-D-NAYJL-BED1 12/16/2009 <0.0033 <0.0033 0.0033 0.016

WWK-D-NAYJL-PT 9/10/2009 0.84 0.81 0.0026 0.013 WWK-D-NAYJL-BED1 9/10/2009 <0.0026 <0.0026 0.0026 0.013 WWK-D-NAYJL-BED1 6/16/2009 <0.0026 <0.0026 0.0026 0.013 WWK-D-NAYJL-BED1 3/18/2009 <0.0026 <0.0026 0.0026 0.013

11/3/10 Page 4 of 9 Table 4.3

### Table 4.3 Residential Treatment Results, West Virginia - GAC System Samples Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

RESIDENT SAMPLE_NUMBER DATESMPL APFO (ug/L) PFOA (ug/L) *LOD (ug/L) *LOQ (ug/L)

WWK-D-NAYJL-BED1 11/26/2008 <0.0017 <0.0017 0.0017 0.0085

WWK-D-NAYJL-PT 9/11/2008 0.67 0.64 0.0023 0.012 WWK-D-NAYJL-BED1 9/11/2008 <0.0023 <0.0023 0.0023 0.012 WWK-D-NAYJL-BED1 6/24/2008 <0.0023 <0.0023 0.0023 0.012 WWK-D-NAYJL-BED1 3/3/2008 <0.0022 <0.0022 0.0022 0.011 WWK-D-NAYJL-BED1 11/27/2007 <0.0031 <0.0031 0.0031 0.016

WWK-D-NAYJL-PT 8/28/2007 0.61 0.59 0.0012 0.0062 WWK-D-NAYJL-BED1 8/28/2007 <0.0012 <0.0012 0.0012 0.0062 WWK-D-NAYJL-BED1 6/12/2007 <0.0027 <0.0027 0.0027 0.013 WWK-D-NAYJL-BED1 3/1/2007 <0.0010 <0.0010 0.0010 0.0051 WWK-D-NAYJL-BED1 10/31/2006 <0.0018 <0.0018 0.0018 0.0090 WWK-D-NAYJL-BED1 8/9/2006 <0.0016 <0.0016 0.0016 0.0078

WWK-D-NAYJL-PT 5/10/2006 0.539 0.518 0.0012 0.006 WWK-D-NAYJL-BED1 5/10/2006 <0.0012 <0.0012 0.0012 0.006 NicholsonDH WWK-D-NICHOLSONDH-BED1 6/23/2010 <0.0038 <0.0038 0.0038 0.019 WWK-D-NICHOLSONDH-BED1 3/15/2010 <0.0035 <0.0035 0.0035 0.018 WWK-D-NICHOLSONDH-BED1 12/16/2009 <0.0033 <0.0033 0.0033 0.016

WWK-D-NICHOLSONDH-PT 9/10/2009 0.11 0.11 0.0026 0.013 WWK-D-NICHOLSONDH-BED1 9/10/2009 <0.0026 <0.0026 0.0026 0.013 WWK-D-NICHOLSONDH-BED1 6/29/2009 <0.0026 <0.0026 0.0026 0.013 WWK-D-NICHOLSONDH-BED1 3/24/2009 <0.0026 <0.0026 0.0026 0.013 WWK-D-NICHOLSONDH-BED1 11/26/2008 <0.0017 <0.0017 0.0017 0.0085

WWK-D-NICHOLSONDH-PT 9/11/2008 0.099 0.095 0.0023 0.012 WWK-D-NICHOLSONDH-BED1 9/11/2008 <0.0023 <0.0023 0.0023 0.012 WWK-D-NICHOLSONDH-BED1 6/28/2008 <0.0023 <0.0023 0.0023 0.012 WWK-D-NICHOLSONDH-BED1 3/24/2008 <0.0019 <0.0019 0.0019 0.0096 WWK-D-NICHOLSONDH-BED1 11/29/2007 <0.0031 <0.0031 0.0031 0.016

WWK-D-NICHOLSONDH-PT 9/5/2007 0.087 0.084 0.0012 0.0062 WWK-D-NICHOLSONDH-BED1 9/5/2007 <0.0012 <0.0012 0.0012 0.0062 WWK-D-NICHOLSONDH-BED1 7/5/2007 <0.0012 <0.0012 0.0012 0.0062 WWK-D-NICHOLSONDH-BED1 6/12/2007 <0.0027 <0.0027 0.0027 0.013 WWK-D-NICHOLSONDH-BED1 5/14/2007 <0.0027 <0.0027 0.0027 0.013 WWK-D-NICHOLSONDH-BED1 4/5/2007 <0.0027 <0.0027 0.0027 0.013 WWK-D-NICHOLSONDH-BED1 3/1/2007 <0.0010 <0.0010 0.0010 0.0051 WWK-D-NICHOLSONDH-BED1 12/22/2006 NQ NQ 0.0010 0.0051 WWK-D-NICHOLSONDH-BED2 12/22/2006 NQ NQ 0.0010 0.0051 WWK-D-NICHOLSONDH-BED1 8/8/2006 <0.0016 <0.0016 0.0016 0.0078

WWK-D-NICHOLSONDH-PT 5/10/2006 0.168 0.162 0.0012 0.006 WWK-D-NICHOLSONDH-PT-2 5/10/2006 0.159 0.153 0.0012 0.006 WWK-D-NICHOLSONDH-BED1 5/10/2006 <0.0012 <0.0012 0.0012 0.006 ParkerJL WWK-D-PARKERJL-PT 9/3/2010 NQ NQ 0.0025 0.012 WWK-D-PARKERJL-BED1 9/3/2010 <0.0025 <0.0025 0.0025 0.012 WWK-D-PARKERJL-BED1 5/25/2010 <0.0038 <0.0038 0.0038 0.019 WWK-D-PARKERJL-BED1 3/10/2010 <0.0035 <0.0035 0.0035 0.018 WWK-D-PARKERJL-BED1 12/9/2009 <0.0033 <0.0033 0.0033 0.016

WWK-D-PARKERJL-PT 9/11/2009 NQ NQ 0.0026 0.013 WWK-D-PARKERJL-BED1 9/11/2009 <0.0026 <0.0026 0.0026 0.013 WWK-D-PARKERJL-BED1 6/11/2009 <0.0026 <0.0026 0.0026 0.013 WWK-D-PARKERJL-BED1 3/17/2009 <0.0026 <0.0026 0.0026 0.013 WWK-D-PARKERJL-BED1 11/24/2008 <0.0017 <0.0017 0.0017 0.0085

WWK-D-PARKERJL-PT 9/11/2008 0.029 0.028 0.0023 0.012 WWK-D-PARKERJL-BED1 9/11/2008 <0.0023 <0.0023 0.0023 0.012

11/3/10 Page 5 of 9 Table 4.3

### Table 4.3 Residential Treatment Results, West Virginia - GAC System Samples Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

RESIDENT SAMPLE_NUMBER DATESMPL APFO (ug/L) PFOA (ug/L) *LOD (ug/L) *LOQ (ug/L)

WWK-D-PARKERJL-BED1 6/23/2008 <0.0023 <0.0023 0.0023 0.012 WWK-D-PARKERJL-BED1 3/21/2008 <0.0019 <0.0019 0.0019 0.0096 WWK-D-PARKERJL-BED1 11/29/2007 <0.0031 <0.0031 0.0031 0.016

WWK-D-PARKERJL-PT 8/28/2007 0.034 0.033 0.0012 0.0062 WWK-D-PARKERJL-BED1 8/28/2007 <0.0012 <0.0012 0.0012 0.0062 WWK-D-PARKERA-BED1 6/12/2007 <0.0027 <0.0027 0.0027 0.013 WWK-D-PARKERJL-BED1 3/8/2007 <0.0010 <0.0010 0.0010 0.0051 WWK-D-PARKERJL-BED1 11/1/2006 <0.0018 <0.0018 0.0018 0.0090 WWK-D-PARKERJL-BED1 8/9/2006 <0.0016 <0.0016 0.0016 0.0078

WWK-D-PARKERAR-PT 5/25/2006 0.0344 0.033 0.0012 0.006 WWK-D-PARKERAR-BED1 5/25/2006 <0.0012 <0.0012 0.0012 0.006 RoushE WWK-D-ROUSHE-BED1 5/21/2010 <0.0038 <0.0038 0.0038 0.019 WWK-D-ROUSHE-BED1 3/17/2010 <0.0035 <0.0035 0.0035 0.018 WWK-D-ROUSHE-BED1 12/17/2009 <0.0033 <0.0033 0.0033 0.016

WWK-D-ROUSHE-PT 9/10/2009 0.20 0.19 0.0026 0.013 WWK-D-ROUSHE-BED1 9/10/2009 <0.0026 <0.0026 0.0026 0.013 WWK-D-ROUSHE-BED1 6/16/2009 <0.0026 <0.0026 0.0026 0.013 WWK-D-ROUSHE-BED1 3/19/2009 <0.0026 <0.0026 0.0026 0.013 WWK-D-ROUSHE-BED1 11/12/2008 <0.0017 <0.0017 0.0017 0.0085

WWK-D-ROUSHE-PT 9/16/2008 0.18 0.17 0.0023 0.012 WWK-D-ROUSHE-BED1 9/16/2008 <0.0023 <0.0023 0.0023 0.012 WWK-D-ROUSHE-BED1 6/16/2008 <0.0019 <0.0019 0.0019 0.0096 WWK-D-ROUSHE-BED1 3/7/2008 <0.0022 <0.0022 0.0022 0.011 WWK-D-ROUSHE-BED1 12/3/2007 <0.0031 <0.0031 0.0031 0.016

WWK-D-ROUSHE-PT 8/23/2007 0.055 0.053 0.0012 0.0062 WWK-D-ROUSHE-BED1 8/23/2007 <0.0012 <0.0012 0.0012 0.0062 WWK-D-ROUSHE-BED1 6/13/2007 <0.0027 <0.0027 0.0027 0.013 WWK-D-ROUSHE-BED1 2/28/2007 <0.0010 <0.0010 0.0010 0.0051 WWK-D-ROUSHE-BED1 12/13/2006 <0.0018 <0.0018 0.0018 0.0090 WWK-D-ROUSHE-BED1 8/11/2006 <0.0026 <0.0026 0.0026 0.013

WWK-D-ROUSHE-PT 6/21/2006 0.0826 0.0794 0.0026 0.013 WWK-D-ROUSHE-BED1 6/21/2006 <0.0026 <0.0026 0.0026 0.013 Rt1Box14 WWK-D-RT1BOX14-BED1 6/28/2010 <0.0025 <0.0025 0.0025 0.012 WWK-D-RT1BOX14-BED1 3/23/2010 <0.0035 <0.0035 0.0035 0.018 WWK-D-RT1BOX14-BED1 12/7/2009 <0.0021 <0.0021 0.0021 0.01

WWK-D-RT1BOX14-PT 9/14/2009 0.031 0.030 0.0026 0.013 WWK-D-RT1BOX14-BED1 9/14/2009 <0.0026 <0.0026 0.0026 0.013 WWK-D-RT1BOX14-BED1 6/26/2009 <0.0026 <0.0026 0.0026 0.013 WWK-D-RT1BOX14-BED1 3/17/2009 <0.0026 <0.0026 0.0026 0.013 WWK-D-RT1BOX14-BED1 12/19/2008 <0.0017 <0.0017 0.0017 0.0085

WWK-D-RT1BOX14-PT 9/23/2008 0.064 0.061 0.0017 0.0085 WWK-D-RT1BOX14-BED1 9/23/2008 <0.0017 <0.0017 0.0017 0.0085 WWK-D-RT1BOX14-BED1 6/28/2008 <0.0023 <0.0023 0.0023 0.012 WWK-D-RT1BOX14-BED1 3/27/2008 <0.0019 <0.0019 0.0019 0.0096 WWK-D-RT1BOX14-BED1 12/29/2007 <0.0022 <0.0022 0.0022 0.011

WWK-D-RT1BOX14-PT 8/30/2007 0.057 0.055 0.0012 0.0062 WWK-D-RT1BOX14-BED1 8/30/2007 <0.0012 <0.0012 0.0012 0.0062 WWK-D-RT1BOX14-BED1 6/20/2007 <0.0012 <0.0012 0.0012 0.0062 WWK-D-RT1BOX14-BED1 2/21/2007 <0.0010 <0.0010 0.0010 0.0051 WWK-D-RT1BOX14-BED1 12/19/2006 <0.0018 <0.0018 0.0018 0.0090

WWK-D-RT1BOX14-PT 8/21/2006 0.056 0.054 0.0026 0.013 WWK-D-RT1BOX14-BED1 8/21/2006 <0.0026 <0.0026 0.0026 0.013

11/3/10 Page 6 of 9 Table 4.3

### Table 4.3 Residential Treatment Results, West Virginia - GAC System Samples Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

RESIDENT SAMPLE_NUMBER DATESMPL APFO (ug/L) PFOA (ug/L) *LOD (ug/L) *LOQ (ug/L) SmithG WWK-D-SMITHG-PT 9/3/2010 NQ NQ 0.0025 0.012 WWK-D-SMITHG-BED1 9/3/2010 <0.0025 <0.0025 0.0025 0.012 WWK-D-SMITHG-BED1 5/25/2010 <0.0038 <0.0038 0.0038 0.019 WWK-D-SMITHG-BED1 3/10/2010 <0.0035 <0.0035 0.0035 0.018 WWK-D-SMITHG-BED1 12/9/2009 <0.0033 <0.0033 0.0033 0.016

WWK-D-SMITHG-PT 9/11/2009 NQ NQ 0.0026 0.013 WWK-D-SMITHG-BED1 9/11/2009 <0.0026 <0.0026 0.0026 0.013 WWK-D-SMITHG-BED1 6/11/2009 <0.0026 <0.0026 0.0026 0.013 WWK-D-SMITHG-BED1 3/23/2009 <0.0043 <0.0043 0.0043 0.021 WWK-D-SMITHG-BED1 11/24/2008 <0.0017 <0.0017 0.0017 0.0085

WWK-D-SMITHG-PT 9/19/2008 NQ NQ 0.0023 0.012 WWK-D-SMITHG-PT-2 9/19/2008 NQ NQ 0.0023 0.012 WWK-D-SMITHG-BED1 9/19/2008 <0.0023 <0.0023 0.0023 0.012 WWK-D-SMITHG-BED1-2 9/19/2008 <0.0023 <0.0023 0.0023 0.012

WWK-D-SMITHG-BED1 6/23/2008 <0.0023 <0.0023 0.0023 0.012 WWK-D-SMITHG-BED1 3/3/2008 <0.0022 <0.0022 0.0022 0.011 WWK-D-SMITHG-BED1 11/29/2007 <0.0031 <0.0031 0.0031 0.016

WWK-D-SMITHG-PT 8/28/2007 NQ NQ 0.0012 0.0062 WWK-D-SMITHG-BED1 8/28/2007 <0.0012 <0.0012 0.0012 0.0062 WWK-D-SMITHG-BED1 6/12/2007 <0.0027 <0.0027 0.0027 0.013 WWK-D-SMITHG-BED1 2/27/2007 <0.0010 <0.0010 0.0010 0.0051 WWK-D-SMITHG-BED1 12/11/2006 <0.0018 <0.0018 0.0018 0.0090

WWK-D-SMITHG-PT 9/12/2006 NQ NQ 0.0026 0.013 WWK-D-SMITHG-BED1 9/12/2006 <0.0026 <0.0026 0.0026 0.013 SummersA WWK-D-SUMMERSA-PT 9/3/2010 0.041 0.039 0.0025 0.012 WWK-D-SUMMERSA-BED1 9/3/2010 <0.0025 <0.0025 0.0025 0.012 WWK-D-SUMMERSA-BED1 5/27/2010 <0.0038 <0.0038 0.0038 0.019 WWK-D-SUMMERSA-BED1 3/10/2010 <0.0035 <0.0035 0.0035 0.018 WWK-D-SUMMERSA-BED1 12/9/2009 <0.0033 <0.0033 0.0033 0.016

WWK-D-SUMMERSA-PT 9/10/2009 0.015 0.014 0.0026 0.013 WWK-D-SUMMERSA-BED1 9/10/2009 <0.0026 <0.0026 0.0026 0.013 WWK-D-SUMMERSA-BED1 6/11/2009 <0.0026 <0.0026 0.0026 0.013 WWK-D-SUMMERSA-BED1 3/17/2009 <0.0026 <0.0026 0.0026 0.013 WWK-D-SUMMERSA-BED1 11/24/2008 <0.0017 <0.0017 0.0017 0.0085

WWK-D-SUMMERSA-PT 9/3/2008 NQ NQ 0.0023 0.012 WWK-D-SUMMERSA-BED1 9/3/2008 <0.0023 <0.0023 0.0023 0.012 WWK-D-SUMMERSA-BED1 6/24/2008 <0.0023 <0.0023 0.0023 0.012 WWK-D-SUMMERSA-BED1 3/3/2008 <0.0022 <0.0022 0.0022 0.011 WWK-D-SUMMERSA-BED1 12/15/2007 <0.0031 <0.0031 0.0031 0.016

WWK-D-SUMMERSA-PT 8/20/2007 <0.0012 <0.0012 0.0012 0.0062 WWK-D-SUMMERSA-BED1 8/20/2007 <0.0012 <0.0012 0.0012 0.0062 WWK-D-SUMMERSA-BED1 6/11/2007 <0.0027 <0.0027 0.0027 0.013 WWK-D-SUMMERSA-BED1 2/27/2007 <0.0010 <0.0010 0.0010 0.0051 WWK-D-SUMMERSA-BED1 10/31/2006 <0.0018 <0.0018 0.0018 0.0090 WWK-D-SUMMERSA-BED1-2 10/31/2006 <0.0018 <0.0018 0.0018 0.0090 WWK-D-SUMMERSA-PT 8/8/2006 0.012 0.012 0.0016 0.0078 WWK-D-SUMMERSA-BED1 8/8/2006 <0.0016 <0.0016 0.0016 0.0078 SweseyJW WWK-D-SWESEYJW-BED1 5/26/2010 <0.0038 <0.0038 0.0038 0.019 WWK-D-SWESEYJW-BED1 3/16/2010 <0.0035 <0.0035 0.0035 0.018 WWK-D-SWESEYJW-BED1 12/16/2009 <0.0033 <0.0033 0.0033 0.016

WWK-D-SWESEYJW-PT 9/11/2009 0.052 0.050 0.0026 0.013 WWK-D-SWESEYJW-BED1 9/11/2009 <0.0026 <0.0026 0.0026 0.013

11/3/10 Page 7 of 9 Table 4.3

### Table 4.3 Residential Treatment Results, West Virginia - GAC System Samples Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

RESIDENT SAMPLE_NUMBER DATESMPL APFO (ug/L) PFOA (ug/L) *LOD (ug/L) *LOQ (ug/L)

WWK-D-SWESEYJW-BED1 6/11/2009 <0.0026 <0.0026 0.0026 0.013 WWK-D-SWESEYJW-BED1 3/18/2009 <0.0026 <0.0026 0.0026 0.013

WWK-D-SWESEYJW-PT 10/22/2008 0.027 0.026 0.0017 0.0085 WWK-D-SWESEYJW-BED1 10/22/2008 <0.0017 <0.0017 0.0017 0.0085

WWK-D-SWESEYJW-PT 9/25/2008 <0.0017 <0.0017 0.0017 0.0085 WWK-D-SWESEYJW-BED1 9/25/2008 0.021 0.020 0.0017 0.0085 WWK-D-SWESEYJW-BED2 9/25/2008 NQ NQ 0.0017 0.0085 WWK-D-SWESEYJW-BED1 6/24/2008 <0.0023 <0.0023 0.0023 0.012 WWK-D-SWESEYJW-BED1 3/3/2008 <0.0022 <0.0022 0.0022 0.011 WWK-D-SWESEYJW-BED1 11/29/2007 <0.0031 <0.0031 0.0031 0.016

WWK-D-SWESEYJW-PT 8/28/2007 0.016 0.015 0.0012 0.0062 WWK-D-SWESEYJW-BED1 8/28/2007 <0.0012 <0.0012 0.0012 0.0062 WWK-D-SWESEYJW-BED1 6/11/2007 <0.0027 <0.0027 0.0027 0.013 WWK-D-SWESEYJW-BED1 2/28/2007 <0.0010 <0.0010 0.0010 0.0051 WWK-D-SWESEYJW-BED1 11/1/2006 <0.0018 <0.0018 0.0018 0.0090 WWK-D-SWESEYJW-BED1 8/9/2006 <0.0016 <0.0016 0.0016 0.0078

WWK-D-SWESEYJW-PT 5/10/2006 0.0397 0.0382 0.0012 0.006 WWK-D-SWESEYJW-BED1 5/10/2006 <0.0012 <0.0012 0.0012 0.006 VincentS WWK-D-VINCENTS-PT 9/3/2010 3.5 3.4 0.025 0.12 WWK-D-VINCENTS-BED1 9/3/2010 <0.0025 <0.0025 0.0025 0.012 WWK-D-VINCENTS-BED1 5/26/2010 <0.0038 <0.0038 0.0038 0.019 WWK-D-VINCENTS-BED1 3/10/2010 <0.0035 <0.0035 0.0035 0.018 WWK-D-VINCENTS-BED1 12/9/2009 <0.0033 <0.0033 0.0033 0.016

WWK-D-VINCENTS-PT 9/10/2009 2.5 2.4 0.026 0.13 WWK-D-VINCENTS-BED1 9/10/2009 <0.0026 <0.0026 0.0026 0.013 WWK-D-VINCENTS-BED1 6/16/2009 <0.0026 <0.0026 0.0026 0.013 WWK-D-VINCENTS-BED1 3/18/2009 <0.0026 <0.0026 0.0026 0.013 WWK-D-VINCENTS-BED1 11/24/2008 <0.0017 <0.0017 0.0017 0.0085

WWK-D-VINCENTS-PT 9/3/2008 2.1 2.0 0.023 0.12 WWK-D-VINCENTS-BED1 9/3/2008 <0.0023 <0.0023 0.0023 0.012 WWK-D-VINCENTS-BED1 6/24/2008 <0.0023 <0.0023 0.0023 0.012 WWK-D-VINCENTS-BED1 3/3/2008 <0.0022 <0.0022 0.0022 0.011 WWK-D-VINCENTS-BED1 11/29/2007 <0.0031 <0.0031 0.0031 0.016 WWK-D-VINCENTS-BED1-2 11/29/2007 <0.0031 <0.0031 0.0031 0.016 WWK-D-VINCENTS-PT 8/20/2007 1.9 1.8 0.012 0.062 WWK-D-VINCENTS-BED1 8/20/2007 <0.0012 <0.0012 0.0012 0.0062 WWK-D-VINCENTS-BED1 6/11/2007 <0.0027 <0.0027 0.0027 0.013 WWK-D-VINCENTS-BED1 3/1/2007 <0.0010 <0.0010 0.0010 0.0051 WWK-D-VINCENTS-BED1 10/31/2006 <0.0018 <0.0018 0.0018 0.0090 WWK-D-VINCENTS-BED1 8/9/2006 <0.0016 <0.0016 0.0016 0.0078 WWK-D-VINCENTSA-PT 5/10/2006 2.66 2.55 0.012 0.06 WWK-D-VINCENTSA-BED1 5/10/2006 <0.0012 <0.0012 0.0012 0.006 WilcoxA WWK-D-WILCOXA-BED1 5/27/2010 <0.0038 <0.0038 0.0038 0.019 WWK-D-WILCOXA-BED1 3/10/2010 <0.0035 <0.0035 0.0035 0.018 WWK-D-WILCOXA-BED1 12/9/2009 NQ NQ 0.0033 0.016 WWK-D-WILCOXA-BED2 12/9/2009 <0.0033 <0.0033 0.0033 0.016

WWK-D-WILCOXA-PT 9/10/2009 1.5 1.4 0.026 0.13 WWK-D-WILCOXA-BED1 9/10/2009 <0.0026 <0.0026 0.0026 0.013 WWK-D-WILCOXA-BED1 6/16/2009 <0.0026 <0.0026 0.0026 0.013 WWK-D-WILCOXA-BED1 3/18/2009 <0.0026 <0.0026 0.0026 0.013 WWK-D-WILCOXA-BED1 11/24/2008 <0.0017 <0.0017 0.0017 0.0085

WWK-D-WILCOXA-PT 9/3/2008 1.4 1.3 0.023 0.12

11/3/10 Page 8 of 9 Table 4.3

### Table 4.3 Residential Treatment Results, West Virginia - GAC System Samples Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

RESIDENT SAMPLE_NUMBER DATESMPL APFO (ug/L) PFOA (ug/L) *LOD (ug/L) *LOQ (ug/L) WWK-D-WILCOXA-BED1 9/3/2008 NQ NQ 0.0023 0.012 WWK-D-WILCOXA-BED2 9/3/2008 NQ NQ 0.0023 0.012 WWK-D-WILCOXA-BED1 6/24/2008 <0.0023 <0.0023 0.0023 0.012 WWK-D-WILCOXA-BED1 3/3/2008 <0.0022 <0.0022 0.0022 0.011 WWK-D-WILCOXA-BED1 11/29/2007 <0.0031 <0.0031 0.0031 0.016

WWK-D-WILCOXA-PT 8/22/2007 1.5 1.4 0.012 0.062 WWK-D-WILCOXA-BED1 8/22/2007 NQ NQ 0.0012 0.0062 WWK-D-WILCOXA-BED2 8/22/2007 <0.0012 <0.0012 0.0012 0.0062 WWK-D-WILCOXA-BED1 6/11/2007 <0.0027 <0.0027 0.0027 0.013 WWK-D-WILCOXA-BED1-2 6/11/2007 <0.0027 <0.0027 0.0027 0.013

WWK-D-WILCOXA-BED1 3/7/2007 <0.0010 <0.0010 0.0010 0.0051 WWK-D-WILCOXA-BED1 10/31/2006 <0.0018 <0.0018 0.0018 0.0090 WWK-D-WILCOXA-BED1 8/10/2006 <0.0016 <0.0016 0.0016 0.0078

WWK-D-WILCOXA-PT 6/21/2006 1.39 1.33 0.012 0.06 WWK-D-WILCOXA-BED1 6/21/2006 <0.0012 <0.0012 0.0012 0.006 WinansJ^ WWK-D-WINANSJ-BED1 6/25/2010 0.016 0.015 0.0025 0.012 WWK-D-WINANSJ-BED2 6/25/2010 0.18 0.17 0.0025 0.012

WWK-D-WINANSJ-PT 9/22/2009 1.9 1.8 0.033 0.16 WWK-D-WINANSJ-BED1 9/22/2009 <0.0033 <0.0033 0.0033 0.016 WWK-D-WINANSJ-BED1 6/18/2009 <0.0026 <0.0026 0.0026 0.013

WWK-D-WINANSJ-PT 7/17/2008 1.6 1.5 0.023 0.12 WWK-D-WINANSJ-BED1 7/17/2008 <0.0023 <0.0023 0.0023 0.012

WWK-D-WINANSJ-PT 9/4/2007 0.77 0.74 0.0012 0.0062 WWK-D-WINANSJ-BED1 9/4/2007 <0.0012 <0.0012 0.0012 0.0062 WWK-D-WINANSJ-BED1 6/12/2007 <0.0027 <0.0027 0.0027 0.013 WWK-D-WINANSJ-BED1 11/16/2006 <0.0018 <0.0018 0.0018 0.0090 WWK-D-WINANSJ-BED1 8/21/2006 <0.0026 <0.0026 0.0026 0.013

WWK-D-WINANSJ-PT 6/19/2006 1.64 1.57 0.012 0.06 WWK-D-WINANSJ-BED1 6/19/2006 <0.0012 <0.0012 0.0012 0.006

#Sample nomenclature may not be consistent over time. However, all samples have been checked to verify that they are from the same location. *Both PFOA and APFO were reported starting with the 4Q04 sampling events. **Starting in July 2005, Limit of Detection (LOD) and Limit of Quantitiation (LOQ) were determined on at least a qyarterly basis using the signal to noise determination described in the Phase II QAPP. NQ = Not quantifiable. Detected at a concentration above the LOD and below the LOQ. ^Well is winterized and no samples are taken during the winter months

11/3/10 Page 9 of 9 Table 4.3

### Table 4.4 Residential GAC Systems, Ohio - Historic Data Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Location Sample Identification# Date APFO (ug/L) *PFOA (ug/L) **LOD (ug/L) **LOQ (ug/L) 2341StSr124 WWO-D-WALTON DM 6/26/2002 0.413 0.01 0.05 2500WelchRD WWO-D-1009222 10/20/2005 0.445 0.428 0.0022 0.011 AnkromCA WWO-D-ANKROM CA 7/9/2002 0.0586 0.01 0.05 BellJ WWO-D-16802 11/29/2005 0.57 0.548 0.0042 0.021 BiseMA WWO-D-16789 11/17/2005 0.166 0.16 0.0041 0.021 BoringAE WWO-D-BORING AE 6/26/2002 1.15 0.01 0.05 BosoFE WWO-D-BOSO-FE 7/25/2002 0.29 0.01 0.05 BowersockVK WWO-D-BOWERSTOCK VK 8/14/2002 0.0825 0.01 0.05 BrewerPS WWO-D-16812 1/10/2006 0.304 0.292 0.0012 0.0062 BuchananAF WWO-D-BUCHANAN AF 7/25/2002 0.755 0.01 0.05 BurtonCE WWO-D-16756 10/3/2005 0.967 0.927 0.0028 0.013 CollinsRL WWK-D-COLLINS RL 3/22/2002 0.224 0.01 0.05 DickeyD WWO-D-1009340 11/17/2005 0.706 0.678 0.0041 0.021 DuganS WWO-D-100019 7/13/2005 0.153 0.147 0.0015 0.0075 DunfeeBL WWO-D-16774 10/20/2005 0.886 0.851 0.0022 0.011 DurstCK WWO-D-15582 1/14/2005 0.226 0.217 0.01 0.05 GivensDL WWK-D-GIVENS DL 5/22/2002 0.416 0.01 0.05 GoudyRA WWO-D-1009852 11/4/2005 0.0961 0.0925 0.0022 0.011 HarrahGC WWO-D-HARRAH GC 6/26/2002 0.844 0.01 0.05 HornbeckKL WWK-D-HORNBECK LK 4/1/2002 0.237 0.01 0.05 KetelsonD WWO-D-KETELSON D 9/11/2002 0.0915 0.01 0.05 KnottsC WWO-D-KNOTTS C 9/10/2002 2.59 0.01 0.05 LewisR WWO-D-LEWIS B 7/13/2005 1.2 1.15 0.015 0.073 MathenyTL WWK-D-MATHENY TL 4/1/2002 0.195 0.01 0.05 MummaE WWO-D-11997 1/5/2005 0.201 0.193 0.01 0.05 NewlunM WWO-D-100044 1/10/2006 0.348 0.334 0.0012 0.0062 OursS WWO-D-16782 11/17/2005 0.15 0.144 0.0041 0.021 ParsonsCF WWO-D-PARSONS CF 2/21/2006 14.5 13.9 0.23 1.2 WWO-D-PARSONS CF-2 2/21/2006 14 13.4 0.23 1.2 WWO-D-PARSONSCF 10/12/2005 17.6 16.9 0.08 0.4 WWO-D-PARSONS CF 7/13/2005 9.34 8.97 0.15 0.73 WWO-D-PARSONS CF-2 7/13/2005 8.81 8.46 0.15 0.73 WWO-D-PARSONS CF 4/21/2005 12.3 11.8 0.01 0.05 WWO-D-PARSONS CF 1/20/2005 11.3 10.9 0.01 0.05 WWO-D-PARSONS CF 11/30/2004 23 22.1 0.01 0.05 WWO-D-PARSONS CF 9/13/2004 15.7 0.01 0.05 WWO-D-PARSONSCF 6/24/2004 13 0.01 0.05 WWO-D-PARSONSCF-DUP 6/24/2004 12.8 0.01 0.05 WWK-D-PARSONS CF 4/8/2002 8.59 0.01 0.05 PriceFL WWO-D-9572 12/22/2004 0.942 0.904 0.01 0.05 WWK-D-PRICE FL 3/22/2002 0.802 0.01 0.05 Riggins1833 WWO-D-11975 12/30/2004 0.134 0.129 0.01 0.05 Riggins1922 WWO-D-16803 1/11/2006 0.47 0.451 0.0012 0.0062 RumerJH WWO-D-RUMER JH 3/14/2006 1.05 1.01 0.023 0.12 WWO-D-RUMERJH 10/12/2005 1.1 1.06 0.04 0.2 WWO-D-RUMER JH 7/13/2005 0.668 0.642 0.015 0.073 WWO-D-RUMER JH 4/21/2005 0.724 0.695 0.01 0.05 WWO-D-RUMER JH 1/20/2005 0.524 0.503 0.01 0.05 WWO-D-RUMER JH 11/29/2004 1.47 1.41 0.01 0.05 WWO-D-RUMER JH 9/13/2004 1.19 0.01 0.05 WWO-D-RUMERJH 6/24/2004 0.751 0.01 0.05 WWK-D-RUMER JH 3/21/2002 3.91 0.01 0.05 RyanSP WWK-D-RYAN SP 3/21/2002 0.0962 0.01 0.05 SmithTJ WWO-D-16767 10/14/2005 0.466 0.448 0.0034 0.017 ThornberryW WWO-D-1009505 10/20/2005 0.25 0.24 0.0022 0.011 WWO-D-1009505-2 10/20/2005 0.25 0.24 0.0022 0.011 WebbOL WWO-D-WEBB D 9/25/2002 0.128 0.01 0.05 WeiglyG WWO-D-1008255 12/23/2004 0.228 0.219 0.01 0.05 Wheaton2610 WWO-D-WHEATON CA 8/21/2002 (<0.05) 0.01 0.05

11/3/10 Page 1 of 2 Table 4.4

### Table 4.4 Residential GAC Systems, Ohio - Historic Data Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Location Sample Identification# Date APFO (ug/L) *PFOA (ug/L) **LOD (ug/L) **LOQ (ug/L)

WhiteheadE WWO-D-1005451 1/10/2006 0.456 0.438 0.0012 0.0062 WilsonRM1 WWO-D-WILSON RM1 7/31/2002 2.04 0.01 0.05

#Sample nomenclature may not be consistent over time. However, all samples have been checked to verify that they are from the same location. *Both PFOA and APFO were reported starting with the 4Q04 sampling events. **Starting in July 2005, Limit of Detection (LOD) and Limit of Quantitiation (LOQ) were determined on at least a quarterly basis using the signal to noise determination described in the Phase II QAPP.

11/3/10 Page 2 of 2 Table 4.4

### Table 4.5 Residential Treatment Results, Ohio - GAC System Samples Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

RESIDENT SAMPLE_NUMBER DATESMPL APFO (ug/L) PFOA (ug/L) *LOD (ug/L) *LOQ (ug/L) 2341StRt124^ WWO-D-2341STRT124-PT 9/3/2010 1.8 1.7 0.025 0.12 WWO-D-2341STRT124-BED1 9/3/2010 <0.0025 <0.0025 0.0025 0.012 WWO-D-2341STRT124-BED1 5/24/2010 <0.0038 <0.0038 0.0038 0.019 WWO-D-2341STRT124-BED1 3/3/2010 <0.0035 <0.0035 0.0035 0.018 WWO-D-2341STRT124-BED1 12/8/2009 <0.0033 <0.0033 0.0033 0.016 WWO-D-2341STRT124-PT 8/25/2009 1.7 1.6 0.026 0.13 WWO-D-2341STRT124-BED1 8/25/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-2341STRT124-BED1 6/3/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-2341STRT124-BED1 2/16/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-2341STRT124-BED1 12/17/2008 <0.0017 <0.0017 0.0017 0.0085 WWO-D-2341STRT124-PT 9/4/2008 1.0 1.0 0.023 0.12 WWO-D-2341STRT124-BED1 9/4/2008 <0.0023 <0.0023 0.0023 0.012 WWO-D-2341STRT124-BED1 6/4/2008 <0.0019 <0.0019 0.0019 0.0096 WWO-D-2341STRT124-BED1 2/12/2008 <0.0022 <0.0022 0.0022 0.011 WWO-D-2341STRT124-BED1 11/20/2007 <0.0031 <0.0031 0.0031 0.016 WWO-D-2341STRT124-PT 8/14/2007 1.1 1.1 0.012 0.062 WWO-D-2341STRT124-BED1 8/14/2007 <0.0012 <0.0012 0.0012 0.0062 WWO-D-WALTONDM-BED1 5/18/2007 <0.0027 <0.0027 0.0027 0.013 WWO-D-WALTONDM-BED1 11/3/2006 <0.0018 <0.0018 0.0018 0.0090 WWO-D-WALTONDM-BED1 8/8/2006 <0.0016 <0.0016 0.0016 0.0078 WWO-D-WALTONDM-PT 7/17/2006 0.278 0.267 0.0026 0.013 WWO-D-WALTONDM-BED1 7/17/2006 <0.0026 <0.0026 0.0026 0.013 WWO-D-WALTONDM-PT 6/22/2006 <0.0026 <0.0026 0.0026 0.013 WWO-D-WALTONDM-BED1 6/22/2006 NQ NQ 0.0026 0.013 2500WelchRd WWO-D-2500WELCHRD-BED1 6/29/2010 <0.0025 <0.0025 0.0025 0.012 WWO-D-2500WELCHRD-BED1 3/26/2010 <0.0038 <0.0038 0.0038 0.019 WWO-D-2500WELCHRD-BED1 12/16/2009 <0.0033 <0.0033 0.0033 0.016 WWO-D-2500WELCHRD-PT 9/24/2009 0.83 0.80 0.0033 0.016 WWO-D-2500WELCHRD-BED1 9/24/2009 <0.0033 <0.0033 0.0033 0.016 WWO-D-2500WELCHRD-BED1 6/4/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-2500WELCHRD-BED1 3/5/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-2500WELCHRD-BED1 12/8/2008 <0.0017 <0.0017 0.0017 0.0085 WWO-D-2500WELCHRD-PT 9/26/2008 0.69 0.66 0.0017 0.0085 WWO-D-2500WELCHRD-BED1 9/26/2008 <0.0017 <0.0017 0.0017 0.0085 WWO-D-2500WELCHRD-BED1 6/5/2008 <0.0019 <0.0019 0.0019 0.0096 WWO-D-2500WELCHRD-BED1 2/26/2008 <0.0022 <0.0022 0.0022 0.011 WWO-D-2500WELCHRD-BED1 11/26/2007 <0.0031 <0.0031 0.0031 0.016 WWO-D-2500WELCHRD-PT 8/9/2007 0.48 0.46 0.0012 0.0062 WWO-D-2500WELCHRD-BED1 8/9/2007 <0.0012 <0.0012 0.0012 0.0062 WWO-D-2500WELCHRD-BED1 5/25/2007 <0.0027 <0.0027 0.0027 0.013 WWO-D-2500WELCHRD-BED1 2/22/2007 <0.0010 <0.0010 0.0010 0.0051 WWO-D-2500WELCHRD-BED1 12/12/2006 <0.0018 <0.0018 0.0018 0.0090 WWO-D-2500WELCHRD-PT 8/22/2006 0.42 0.40 0.0026 0.013 WWO-D-2500WELCHRD-BED1 8/22/2006 <0.0026 <0.0026 0.0026 0.013 AnkromCA WWO-D-ANKROMCA-BED1 5/25/2010 <0.0038 <0.0038 0.0038 0.019 WWO-D-ANKROMCA-BED1 3/22/2010 <0.0035 <0.0035 0.0035 0.018 WWO-D-ANKROMCA-BED1 12/8/2009 <0.0033 <0.0033 0.0033 0.016 WWO-D-ANKROMCA-PT 9/11/2009 0.12 0.12 0.0026 0.013 WWO-D-ANKROMCA-BED1 9/11/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-ANKROMCA-BED1 6/5/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-ANKROMCA-BED1 3/18/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-ANKROMCA-BED1 12/9/2008 <0.0017 <0.0017 0.0017 0.0085

11/3/10 Page 1 of 20 Table 4.5

### Table 4.5 Residential Treatment Results, Ohio - GAC System Samples Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

RESIDENT SAMPLE_NUMBER DATESMPL APFO (ug/L) PFOA (ug/L) *LOD (ug/L) *LOQ (ug/L)

WWO-D-ANKROMCA-PT 9/9/2008 0.12 0.12 0.0023 0.012 WWO-D-ANKROMCA-BED1 9/9/2008 <0.0023 <0.0023 0.0023 0.012 WWO-D-ANKROMCA-BED1 6/4/2008 <0.0019 <0.0019 0.0019 0.0096 WWO-D-ANKROMCA-BED1 2/14/2008 <0.0022 <0.0022 0.0022 0.011 WWO-D-ANKROMCA-BED1 11/19/2007 <0.0031 <0.0031 0.0031 0.016 WWO-D-ANKROMCA-PT 8/8/2007 0.075 0.072 0.0012 0.0062 WWO-D-ANKROMCA-BED1 8/8/2007 <0.0012 <0.0012 0.0012 0.0062 WWO-D-ANKROMCA-BED1 5/25/2007 <0.0027 <0.0027 0.0027 0.013 WWO-D-ANKROMCA-BED1 2/16/2007 <0.0010 <0.0010 0.0010 0.0051 WWO-D-ANKROMCA-BED1 12/8/2006 <0.0018 <0.0018 0.0018 0.0090 WWO-D-ANKROMCA-BED1-2 12/8/2006 <0.0018 <0.0018 0.0018 0.0090 WWO-D-ANKROMCA-PT 8/21/2006 0.042 0.040 0.0026 0.013 WWO-D-ANKROMCA-BED1 8/21/2006 <0.0026 <0.0026 0.0026 0.013 BellJ WWO-D-BELLJ-PT 9/1/2010 0.73 0.70 0.0025 0.012 WWO-D-BELLJ-BED1 9/1/2010 <0.0025 <0.0025 0.0025 0.012 WWO-D-BELLJ-BED1 5/18/2010 <0.0038 <0.0038 0.0038 0.019 WWO-D-BELLJ-BED1 1/29/2010 <0.0035 <0.0035 0.0035 0.018 WWO-D-BELLJ-BED1 11/2/2009 <0.0033 <0.0033 0.0033 0.016 WWO-D-BELLJ-PT 8/25/2009 0.74 0.71 0.0026 0.013 WWO-D-BELLJ-BED1 8/25/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-BELLJ-BED1 6/4/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-BELLJ-BED1 2/17/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-BELLJ-BED1 12/8/2008 <0.0017 <0.0017 0.0017 0.0085 WWO-D-BELLJ-PT 7/18/2008 0.67 0.64 0.023 0.12 WWO-D-BELLJ-BED1 7/18/2008 <0.0023 <0.0023 0.0023 0.012 WWO-D-BELLJ-BED1 6/5/2008 NQ NQ 0.0019 0.0096 WWO-D-BELLJ-BED2 6/5/2008 1.0 1.0 0.0019 0.0096 WWO-D-BELLJ-BED1 2/26/2008 <0.0022 <0.0022 0.0022 0.011 WWO-D-BELLJ-BED1 11/19/2007 <0.0031 <0.0031 0.0031 0.016 WWO-D-BELLJ-PT 8/9/2007 1.1 1.1 0.012 0.062 WWO-D-BELLJ-BED1 8/9/2007 <0.0012 <0.0012 0.0012 0.0062 WWO-D-BELLJ-BED1 5/24/2007 <0.0027 <0.0027 0.0027 0.013 WWO-D-BELLJ-BED1 12/6/2006 <0.0018 <0.0018 0.0018 0.0090 WWO-D-BELLJ-PT 8/15/2006 0.67 0.64 0.0026 0.013 WWO-D-BELLJ-BED1 8/15/2006 <0.0026 <0.0026 0.0026 0.013 BiseMA@ WWO-D-BISEMA-PT 8/15/2007 0.085 0.082 0.0012 0.0062 WWO-D-BISEMA-BED1 8/15/2007 <0.0012 <0.0012 0.0012 0.0062 WWO-D-BISEMA-BED1 5/30/2007 <0.0027 <0.0027 0.0027 0.013 WWO-D-BISEMA-BED1 2/23/2007 <0.0010 <0.0010 0.0010 0.0051 WWO-D-BISEMA-BED1 12/7/2006 <0.0018 <0.0018 0.0018 0.0090 WWO-D-BISEMA-BED1 8/16/2006 <0.0026 <0.0026 0.0026 0.013 WWO-D-BISEMA-PT 5/24/2006 0.0871 0.0837 0.0012 0.006 WWO-D-BISEMA-BED1 5/24/2006 <0.0012 <0.0012 0.0012 0.006 BoringAE WWO-D-BORINGAE-PT 9/3/2010 2.3 2.2 0.025 0.12 WWO-D-BORINGAE-BED1 9/3/2010 <0.0025 <0.0025 0.0025 0.012 WWO-D-BORINGAE-BED1 5/24/2010 <0.0038 <0.0038 0.0038 0.019 WWO-D-BORINGAE-BED1 3/3/2010 <0.0035 <0.0035 0.0035 0.018 WWO-D-BORINGAE-BED1 12/8/2009 <0.0033 <0.0033 0.0033 0.016 WWO-D-BORINGAE-PT 9/23/2009 2.0 1.9 0.033 0.16 WWO-D-BORINGAE-BED1 9/23/2009 <0.0033 <0.0033 0.0033 0.016 WWO-D-BORINGAE-BED1 6/3/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-BORINGAE-BED1 2/16/2009 <0.0026 <0.0026 0.0026 0.013

11/3/10 Page 2 of 20 Table 4.5

### Table 4.5 Residential Treatment Results, Ohio - GAC System Samples Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

RESIDENT SAMPLE_NUMBER DATESMPL APFO (ug/L) PFOA (ug/L) *LOD (ug/L) *LOQ (ug/L)

WWO-D-BORINGAE-BED1 12/17/2008 <0.0017 <0.0017 0.0017 0.0085 WWO-D-BORINGAE-PT 9/4/2008 1.5 1.4 0.023 0.12 WWO-D-BORINGAE-BED1 9/4/2008 <0.0023 <0.0023 0.0023 0.012 WWO-D-BORINGAE-BED1 6/4/2008 <0.0019 <0.0019 0.0019 0.0096 WWO-D-BORINGAE-BED1 2/12/2008 <0.0022 <0.0022 0.0022 0.011 WWO-D-BORINGAE-BED1 11/20/2007 <0.0031 <0.0031 0.0031 0.016 WWO-D-BORINGAE-PT 8/14/2007 1.7 1.6 0.012 0.062 WWO-D-BORINGAE-BED1 8/14/2007 <0.0012 <0.0012 0.0012 0.0062 WWO-D-BORINGAE-BED1 5/18/2007 <0.0027 <0.0027 0.0027 0.013 WWO-D-BORINGAE-BED1 2/22/2007 <0.0010 <0.0010 0.0010 0.0051 WWO-D-BORINGAE-BED1-2 2/22/2007 <0.0010 <0.0010 0.0010 0.0051 WWO-D-BORINGAE-BED1 12/6/2006 <0.0018 <0.0018 0.0018 0.0090 WWO-D-BORINGAE-BED1 8/8/2006 <0.0016 <0.0016 0.0016 0.0078 WWO-D-BORINGAE-PT 5/11/2006 2.42 2.32 0.012 0.06 WWO-D-BORINGAE-BED1 5/11/2006 <0.0012 <0.0012 0.0012 0.006 BosoFE WWO-D-BOSOFE-PT 8/25/2010 1.2 1.2 0.025 0.12 WWO-D-BOSOFE-BED1 8/25/2010 <0.0025 <0.0025 0.0025 0.012 WWO-D-BOSOFE-BED1 5/24/2010 <0.0038 <0.0038 0.0038 0.019 WWO-D-BOSOFE-BED1 3/3/2010 <0.0035 <0.0035 0.0035 0.018 WWO-D-BOSOFE-BED1 12/14/2009 <0.0021 <0.0021 0.0021 0.01 WWO-D-BOSOFE-PT 8/31/2009 1.0 1.0 0.026 0.13 WWO-D-BOSOFE-BED1 8/31/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-BOSOFE-BED1 6/3/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-BOSOFE-BED1 2/16/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-BOSOFE-BED1 12/8/2008 <0.0017 <0.0017 0.0017 0.0085 WWO-D-BOSOFE-PT 9/4/2008 0.78 0.75 0.0023 0.012 WWO-D-BOSOFE-BED1 9/4/2008 <0.0023 <0.0023 0.0023 0.012 WWO-D-BOSOFE-BED1 6/4/2008 NQ NQ 0.0019 0.0096 WWO-D-BOSOFE-BED2 6/4/2008 <0.0019 <0.0019 0.0019 0.0096 WWO-D-BOSOFE-BED1 2/12/2008 <0.0022 <0.0022 0.0022 0.011 WWO-D-BOSOFE-BED1 11/19/2007 <0.0031 <0.0031 0.0031 0.016 WWO-D-BOSOFE-BED1-2 11/19/2007 <0.0031 <0.0031 0.0031 0.016 WWO-D-BOSOFE-PT 8/16/2007 0.81 0.78 0.0012 0.0062 WWO-D-BOSOFE-BED1 8/16/2007 <0.0012 <0.0012 0.0012 0.0062 WWO-D-BOSOFE-BED1 5/16/2007 <0.0027 <0.0027 0.0027 0.013 WWO-D-BOSOFE-BED1 2/12/2007 <0.0010 <0.0010 0.0010 0.0051 WWO-D-BOSOFE-BED1 12/6/2006 <0.0018 <0.0018 0.0018 0.0090 WWO-D-BOSOFE-BED1 8/10/2006 <0.0016 <0.0016 0.0016 0.0078 WWO-D-BOSOFE-PT 5/15/2006 0.789 0.758 0.00098 0.0049 WWO-D-BOSOFE-PT-2 5/15/2006 0.852 0.818 0.00098 0.0049 WWO-D-BOSOFE-BED1 5/15/2006 <0.00098 <0.00098 0.00098 0.0049 BowersockVK WWO-D-BOWERSOCKVK-PT 9/1/2010 0.22 0.21 0.0025 0.012 WWO-D-BOWERSOCKVK-BED1 9/1/2010 <0.0025 <0.0025 0.0025 0.012 WWO-D-BOWERSOCKVK-BED1 5/17/2010 <0.0038 <0.0038 0.0038 0.019 WWO-D-BOWERSOCKVK-BED1 3/3/2010 <0.0035 <0.0035 0.0035 0.018 WWO-D-BOWERSOCKVK-BED1 12/1/2009 <0.0021 <0.0021 0.0021 0.010 WWO-D-BOWERSOCKVK-PT 7/29/2009 0.21 0.20 0.0026 0.013 WWO-D-BOWERSOCKVK-BED1 7/29/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-BOWERSOCKVK-BED1 5/7/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-BOWERSOCKVK-BED1 2/12/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-BOWERSOCKVK-BED1-2 2/12/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-BOWERSOCKVK-BED1 11/11/2008 <0.0017 <0.0017 0.0017 0.0085

11/3/10 Page 3 of 20 Table 4.5

### Table 4.5 Residential Treatment Results, Ohio - GAC System Samples Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

RESIDENT SAMPLE_NUMBER DATESMPL APFO (ug/L) PFOA (ug/L) *LOD (ug/L) *LOQ (ug/L)

WWO-D-BOWERSOCKVK-PT 9/2/2008 0.16 0.15 0.0023 0.012 WWO-D-BOWERSOCKVK-BED1 9/2/2008 <0.0023 <0.0023 0.0023 0.012 WWO-D-BOWERSOCKVK-BED1 4/8/2008 <0.0019 <0.0019 0.0019 0.0096 WWO-D-BOWERSOCKVK-BED1 2/4/2008 <0.0022 <0.0022 0.0022 0.011 WWO-D-BOWERSOCKVK-BED1 11/1/2007 <0.0031 <0.0031 0.0031 0.016 WWO-D-BOWERSOCKVK-PT 7/24/2007 0.2 0.19 0.0012 0.0062 WWO-D-BOWERSOCKVK-BED1 7/24/2007 NQ NQ 0.0012 0.0062 WWO-D-BOWERSOCKVK-BED2 7/24/2007 NQ NQ 0.0012 0.0062 WWO-D-BOWERSOCKVK-BED1 5/9/2007 <0.0027 <0.0027 0.0027 0.013 WWO-D-BOWERSOCKVK-BED1 2/1/2007 <0.0010 <0.0010 0.0010 0.0051 WWO-D-BOWERSOCKVK-BED1 11/2/2006 NQ NQ 0.0018 0.0090 WWO-D-BOWERSOCKVK-BED2 11/2/2006 <0.0018 <0.0018 0.0018 0.0090 WWO-D-BOWERSOCKVK-BED1 8/17/2006 <0.0026 <0.0026 0.0026 0.013 WWO-D-BOWERSOCKVK-BED1-2 8/17/2006 <0.0026 <0.0026 0.0026 0.013 WWO-D-BOWERSOCKVK-PT 5/16/2006 0.207 0.199 0.0012 0.006 WWO-D-BOWERSOCKVK-BED1 5/16/2006 <0.0012 <0.0012 0.0012 0.006 BrewerPS WWO-D-BREWERPS-BED1 6/23/2010 <0.0038 <0.0038 0.0038 0.019 WWO-D-BREWERPS-BED1 3/16/2010 <0.0035 <0.0035 0.0035 0.018 WWO-D-BREWERPS-BED1 12/10/2009 <0.0021 <0.0021 0.0021 0.01 WWO-D-BREWERPS-PT 9/1/2009 0.14 0.13 0.0026 0.013 WWO-D-BREWERPS-BED1 9/1/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-BREWERPS-BED1 6/10/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-BREWERPS-BED1 3/24/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-BREWERPS-PT 9/10/2008 0.19 0.18 0.0023 0.012 WWO-D-BREWERPS-BED1 9/10/2008 <0.0023 <0.0023 0.0023 0.012 WWO-D-BREWERPS-BED1 5/28/2008 <0.0019 <0.0019 0.0019 0.0096 WWO-D-BREWERPS-BED1 3/26/2008 <0.0019 <0.0019 0.0019 0.0096 WWO-D-BREWERPS-BED1 12/4/2007 <0.0031 <0.0031 0.0031 0.016 WWO-D-BREWERPR-PT 8/15/2007 0.24 0.23 0.0012 0.0062 WWO-D-BREWERPS-BED1 8/15/2007 <0.0012 <0.0012 0.0012 0.0062 WWO-D-BREWERPS-BED1 5/30/2007 <0.0027 <0.0027 0.0027 0.013 WWO-D-BREWERPS-BED1 2/23/2007 <0.0010 <0.0010 0.0010 0.0051 WWO-D-BREWERPS-BED1 12/7/2006 <0.0018 <0.0018 0.0018 0.0090 WWO-D-BREWERPS-BED1 8/16/2006 <0.0026 <0.0026 0.0026 0.013 WWO-D-BREWERPS-PT 6/20/2006 0.244 0.234 0.0012 0.006 WWO-D-BREWERPS-BED1 6/20/2006 <0.0012 <0.0012 0.0012 0.006 BuchananAF WWO-D-BUCHANANAF-PT 8/25/2010 2.1 2.0 0.025 0.12 WWO-D-BUCHANANAF-BED1 8/25/2010 <0.0025 <0.0025 0.0025 0.012 WWO-D-BUCHANANAF-BED1 6/25/2010 <0.0025 <0.0025 0.0025 0.012 WWO-D-BUCHANANAF-BED1 3/3/2010 <0.0035 <0.0035 0.0035 0.018 WWO-D-BUCHANANAF-BED1 12/14/2009 <0.0021 <0.0021 0.0021 0.01 WWO-D-BUCHANANAF-PT 8/31/2009 1.7 1.6 0.026 0.13 WWO-D-BUCHANANAF-BED1 8/31/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-BUCHANANAF-BED1 6/3/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-BUCHANANAF-BED1 2/16/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-BUCHANANAF-BED1 12/8/2008 <0.0017 <0.0017 0.0017 0.0085 WWO-D-BUCHANANAF-PT 9/4/2008 1.6 1.5 0.023 0.12 WWO-D-BUCHANANAF-BED1 9/4/2008 <0.0023 <0.0023 0.0023 0.012 WWO-D-BUCHANANAF-BED1 6/19/2008 <0.0019 <0.0019 0.0019 0.0096 WWO-D-BUCHANANAF-BED1 2/12/2008 <0.0022 <0.0022 0.0022 0.011 WWO-D-BUCHANANAF-BED1 11/19/2007 <0.0031 <0.0031 0.0031 0.016 WWO-D-BUCHANONAF-PT 8/8/2007 1.8 1.7 0.012 0.062

11/3/10 Page 4 of 20 Table 4.5

### Table 4.5 Residential Treatment Results, Ohio - GAC System Samples Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

RESIDENT SAMPLE_NUMBER DATESMPL APFO (ug/L) PFOA (ug/L) *LOD (ug/L) *LOQ (ug/L)

WWO-D-BUCHANONAF-BED1 8/8/2007 <0.0012 <0.0012 0.0012 0.0062 WWO-D-BUCHANANAF-BED1 5/17/2007 <0.0027 <0.0027 0.0027 0.013 WWO-D-BUCHANANAF-BED1 2/16/2007 <0.0010 <0.0010 0.0010 0.0051 WWO-D-BUCHANANAF-BED1 12/6/2006 <0.0018 <0.0018 0.0018 0.0090 WWO-D-BUCHANANAF-BED1 8/10/2006 <0.0016 <0.0016 0.0016 0.0078 WWO-D-BUCHANONAF-PT 5/15/2006 2.4 2.3 0.0098 0.049 WWO-D-BUCHANONAF-BED1 5/15/2006 <0.00098 <0.00098 0.00098 0.0049 BurtonCE WWO-D-BURTONCE-PT 9/1/2010 0.20 0.19 0.0025 0.012 WWO-D-BURTONCE-BED1 9/1/2010 <0.0025 <0.0025 0.0025 0.012 WWO-D-BURTONCE-BED1 5/20/2010 <0.0038 <0.0038 0.0038 0.019 WWO-D-BURTONCE-BED1 3/10/2010 <0.0035 <0.0035 0.0035 0.018 WWO-D-BURTONCE-BED1 12/8/2009 <0.0033 <0.0033 0.0033 0.016 WWO-D-BURTONCE-PT 8/31/2009 0.83 0.80 0.0026 0.013 WWO-D-BURTONCE-BED1 8/31/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-BURTONCE-BED1 6/10/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-BURTONCE-BED1 3/5/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-BURTONCE-BED1 12/1/2008 <0.0017 <0.0017 0.0017 0.0085 WWO-D-BURTONCE-PT 9/10/2008 0.82 0.79 0.0023 0.012 WWO-D-BURTONCE-BED1 9/10/2008 0.042 0.040 0.0023 0.012 WWO-D-BURTONCE-BED2 9/10/2008 <0.0023 <0.0023 0.0023 0.012 WWO-D-BURTONCE-BED1 6/5/2008 NQ NQ 0.0019 0.0096 WWO-D-BURTONCE-BED2 6/5/2008 <0.0019 <0.0019 0.0019 0.0096 WWO-D-BURTONCE-BED1 2/26/2008 <0.0022 <0.0022 0.0022 0.011 WWO-D-BURTONCE-BED1 11/30/2007 <0.0031 <0.0031 0.0031 0.016 WWO-D-BURTONCE-PT 8/13/2007 0.91 0.87 0.0012 0.0062 WWO-D-BURTONCE-BED1 8/13/2007 <0.0012 <0.0012 0.0012 0.0062 WWO-D-BURTONCE-BED1 5/25/2007 <0.0027 <0.0027 0.0027 0.013 WWO-D-BURTONCE-BED1 2/20/2007 <0.0010 <0.0010 0.0010 0.0051 WWO-D-BURTONCE-BED1 1/17/2007 NQ NQ 0.0010 0.0051 WWO-D-BURTONCE-BED2 1/17/2007 <0.0010 <0.0010 0.0010 0.0051 WWO-D-BURTONCE-BED1 12/15/2006 <0.0018 <0.0018 0.0018 0.0090 WWO-D-BURTONCE-BED1 11/6/2006 <0.0018 <0.0018 0.0018 0.0090 WWO-D-BURTONCE-BED1 10/11/2006 <0.0018 <0.0018 0.0018 0.0090 WWO-D-BURTONCE-BED1 9/6/2006 <0.0026 <0.0026 0.0026 0.013 WWO-D-BURTONCE-BED1 8/10/2006 0.018 0.017 0.0016 0.0078 WWO-D-BURTONCE-BED2 8/10/2006 <0.0026 <0.0026 0.0026 0.013 WWO-D-BURTONCE-BED1 7/7/2006 NQ NQ 0.0026 0.013 WWO-D-BURTONCE-BED2 7/7/2006 <0.0026 <0.0026 0.0026 0.013 WWO-D-BURTONCE-PT 5/24/2006 0.897 0.861 0.0012 0.006 WWO-D-BURTONCE-BED1 5/24/2006 NQ NQ 0.0012 0.006 WWO-D-BURTONCE-BED2 5/24/2006 <0.0012 <0.0012 0.0012 0.006 CollinsRL WWO-D-COLLINSRL-PT 8/25/2010 0.60 0.58 0.0025 0.012 WWO-D-COLLINSRL-BED1 8/25/2010 <0.0025 <0.0025 0.0025 0.012 WWO-D-COLLINSRL-BED1 5/18/2010 <0.0038 <0.0038 0.0038 0.019 WWO-D-COLLINSRL-BED1 3/2/2010 <0.0035 <0.0035 0.0035 0.018 WWO-D-COLLINSRL-BED1 12/2/2009 <0.0021 <0.0021 0.0021 0.010 WWO-D-COLLINSRL-PT 8/10/2009 0.55 0.53 0.0026 0.013 WWO-D-COLLINSRL-BED1 8/10/2009 NQ NQ 0.0026 0.013 WWO-D-COLLINSRL-BED2 8/10/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-COLLINSRL-BED1 5/7/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-COLLINSRL-BED1 2/9/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-COLLINSRL-BED1 11/11/2008 NQ NQ 0.0017 0.0085

11/3/10 Page 5 of 20 Table 4.5

### Table 4.5 Residential Treatment Results, Ohio - GAC System Samples Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

RESIDENT SAMPLE_NUMBER DATESMPL APFO (ug/L) PFOA (ug/L) *LOD (ug/L) *LOQ (ug/L)

WWO-D-COLLINSRL-BED2 11/11/2008 <0.0017 <0.0017 0.0017 0.0085 WWO-D-COLLINSRL-PT 7/31/2008 0.40 0.38 0.0023 0.012 WWO-D-COLLINSRL-BED1 7/31/2008 <0.0023 <0.0023 0.0023 0.012 WWO-D-COLLINSRL-BED1 4/8/2008 <0.0019 <0.0019 0.0019 0.0096 WWO-D-COLLINSRL-BED1 2/4/2008 NQ NQ 0.0022 0.011 WWO-D-COLLINSRL-BED2 2/4/2008 NQ NQ 0.0022 0.011 WWO-D-COLLINSRL-BED1 11/1/2007 <0.0031 <0.0031 0.0031 0.016 WWO-D-COLLINSRL-PT 7/20/2007 0.43 0.41 0.0012 0.0062 WWO-D-COLLINSRL-BED1 7/20/2007 <0.0012 <0.0012 0.0012 0.0062 WWO-D-COLLINSRL-BED1 6/13/2007 <0.0027 <0.0027 0.0027 0.013 WWO-D-COLLINSRL-BED1 5/9/2007 <0.0027 <0.0027 0.0027 0.013 WWO-D-COLLINSRL-BED1 4/25/2007 <0.0027 <0.0027 0.0027 0.013 WWO-D-COLLINSRL-BED1 3/29/2007 <0.0027 <0.0027 0.0027 0.013 WWO-D-COLLINSRL-BED1 2/20/2007 NQ NQ 0.0010 0.0051 WWO-D-COLLINSRL-BED2 2/20/2007 NQ NQ 0.0010 0.0051 WWO-D-COLLINSRL-BED1 1/31/2007 NQ NQ 0.0010 0.0051 WWO-D-COLLINSRL-BED2 1/31/2007 NQ NQ 0.0010 0.0051 WWO-D-COLLINSRL-BED1 11/2/2006 NQ NQ 0.0018 0.0090 WWO-D-COLLINSRL-BED2 11/2/2006 <0.0018 <0.0018 0.0018 0.0090 WWO-D-COLLINSRL-BED1 8/15/2006 NQ NQ 0.0026 0.013 WWO-D-COLLINSRL-BED2 8/15/2006 <0.0026 <0.0026 0.0026 0.013 WWO-D-COLLINSRL-PT 5/12/2006 0.439 0.421 0.0012 0.006 WWO-D-COLLINSRL-BED1 5/12/2006 <0.0012 <0.0012 0.0012 0.006 DickeyD WWO-D-DICKEYD-PT 8/25/2010 0.74 0.71 0.0025 0.012 WWO-D-DICKEYD-BED1 8/25/2010 <0.0025 <0.0025 0.0025 0.012 WWO-D-DICKEYD-BED1 5/24/2010 <0.0038 <0.0038 0.0038 0.019 WWO-D-DICKEYD-BED1 3/4/2010 <0.0035 <0.0035 0.0035 0.018 WWO-D-DICKEYD-BED1 12/7/2009 <0.0033 <0.0033 0.0033 0.016 WWO-D-DICKEYD-PT 8/25/2009 0.87 0.84 0.0026 0.013 WWO-D-DICKEYD-BED1 8/25/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-DICKEYD-BED1 6/4/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-DICKEYD-BED1 2/17/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-DICKEYD-BED1 12/8/2008 <0.0017 <0.0017 0.0017 0.0085 WWO-D-DICKEYD-PT 9/2/2008 0.49 0.47 0.0023 0.012 WWO-D-DICKEYD-BED1 9/2/2008 <0.0023 <0.0023 0.0023 0.012 WWO-D-DICKEYD-BED1 6/4/2008 <0.0019 <0.0019 0.0019 0.0096 WWO-D-DICKEYD-BED1 2/14/2008 <0.0022 <0.0022 0.0022 0.011 WWO-D-DICKEYD-BED1 11/20/2007 <0.0031 <0.0031 0.0031 0.016 WWO-D-DICKEYD-PT 8/9/2007 0.59 0.57 0.0012 0.0062 WWO-D-DICKEYD-BED1 8/9/2007 <0.0012 <0.0012 0.0012 0.0062 WWO-D-DICKEYD-BED1 5/24/2007 <0.0027 <0.0027 0.0027 0.013 WWO-D-DICKEYD-BED1 2/19/2007 <0.0010 <0.0010 0.0010 0.0051 WWO-D-DICKEYD-BED1 12/11/2006 <0.0018 <0.0018 0.0018 0.0090 WWO-D-DICKEYD-PT 8/24/2006 0.64 0.61 0.0026 0.013 WWO-D-DICKEYD-BED1 8/24/2006 <0.0026 <0.0026 0.0026 0.013 DuganS WWO-D-DUGANS-PT 8/18/2010 0.25 0.24 0.0025 0.012 WWO-D-DUGANS-BED1 8/18/2010 NQ NQ 0.0025 0.012 WWO-D-DUGANS-BED2 8/18/2010 NQ NQ 0.0025 0.012 WWO-D-DUGANS-BED1 5/17/2010 NQ NQ 0.0038 0.019 WWO-D-DUGANS-BED2 5/17/2010 <0.0038 <0.0038 0.0038 0.019 WWO-D-DUGANS-BED1 3/2/2010 NQ NQ 0.0035 0.018 WWO-D-DUGANS-BED2 3/2/2010 NQ NQ 0.0035 0.018

11/3/10 Page 6 of 20 Table 4.5

### Table 4.5 Residential Treatment Results, Ohio - GAC System Samples Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

RESIDENT SAMPLE_NUMBER DATESMPL APFO (ug/L) PFOA (ug/L) *LOD (ug/L) *LOQ (ug/L) WWO-D-DUGANS-BED1 12/1/2009 NQ NQ 0.0021 0.010 WWO-D-DUGANS-BED2 12/1/2009 <0.0021 <0.0021 0.0021 0.010 WWO-D-DUGANS-PT 7/29/2009 0.30 0.29 0.0026 0.013 WWO-D-DUGANS-BED1 7/29/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-DUGANS-BED1 5/5/2009 NQ NQ 0.0026 0.013 WWO-D-DUGANS-BED2 5/5/2009 NQ NQ 0.0026 0.013 WWO-D-DUGANS-BED1 2/9/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-DUGANS-BED1 11/11/2008 <0.0017 <0.0017 0.0017 0.0085 WWO-D-DUGANS-PT 7/31/2008 0.21 0.20 0.0023 0.012 WWO-D-DUGANS-BED1 7/31/2008 <0.0023 <0.0023 0.0023 0.012 WWO-D-DUGANS-BED1 4/8/2008 NQ NQ 0.0019 0.0096 WWO-D-DUGANS-BED2 4/8/2008 <0.0019 <0.0019 0.0019 0.0096 WWO-D-DUGANS-BED1 2/4/2008 <0.0022 <0.0022 0.0022 0.011 WWO-D-DUGANS-BED1 11/1/2007 <0.0031 <0.0031 0.0031 0.016 WWO-D-DUGANS-PT 7/25/2007 0.26 0.25 0.0012 0.0062 WWO-D-DUGANS-BED1 7/25/2007 NQ NQ 0.0012 0.0062 WWO-D-DUGANS-BED2 7/25/2007 NQ NQ 0.0012 0.0062 WWO-D-DUGANS-BED1 5/9/2007 <0.0027 <0.0027 0.0027 0.013 WWO-D-DUGANS-BED1 2/1/2007 <0.0010 <0.0010 0.0010 0.0051 WWO-D-DUGANS-BED1 10/30/2006 <0.0018 <0.0018 0.0018 0.0090 WWO-D-DUGANS-PT 9/5/2006 0.30 0.29 0.0026 0.013 WWO-D-DUGANS-BED1 9/5/2006 <0.0026 <0.0026 0.0026 0.013 DunfeeBL WWO-D-DUNFEEBL-BED1 6/28/2010 NQ NQ 0.0025 0.012 WWO-D-DUNFEEBL-BED2 6/28/2010 <0.0025 <0.0025 0.0025 0.012 WWO-D-DUNFEEBL-BED1 3/17/2010 <0.0035 <0.0035 0.0035 0.018 WWO-D-DUNFEEBL-BED1 12/18/2009 <0.0033 <0.0033 0.0033 0.016 WWO-D-DUNFEEBL-PT 9/24/2009 0.85 0.82 0.0033 0.016 WWO-D-DUNFEEBL-BED1 9/24/2009 <0.0033 <0.0033 0.0033 0.016 WWO-D-DUNFEEBL-BED1 6/17/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-DUNFEEBL-BED1 3/20/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-DUNFEEBL-BED1 12/18/2008 NQ NQ 0.0017 0.0085 WWO-D-DUNFEEBL-BED2 12/18/2008 <0.0026 <0.0026 0.0026 0.013 WWO-D-DUNFEEBL-PT 9/19/2008 0.71 0.68 0.0017 0.0085 WWO-D-DUNFEEBL-BED1 9/19/2008 NQ NQ 0.0017 0.0085 WWO-D-DUNFEEBL-BED2 9/19/2008 <0.0017 <0.0017 0.0017 0.0085 WWO-D-DUNFEEBL-BED1 6/19/2008 <0.0019 <0.0019 0.0019 0.0096 WWO-D-DUNFEEBL-BED1 3/4/2008 <0.0022 <0.0022 0.0022 0.011 WWO-D-DUNFEEBL-BED1 11/27/2007 NQ NQ 0.0031 0.016 WWO-D-DUNFEEBL-BED2 11/27/2007 <0.0031 <0.0031 0.0031 0.016 WWO-D-DUNFEEBL-PT 8/14/2007 0.37 0.36 0.0012 0.0062 WWO-D-DUNFEEBL-BED1 8/14/2007 <0.0012 <0.0012 0.0012 0.0062 WWO-D-DUNFEEBL-BED1 5/31/2007 <0.0027 <0.0027 0.0027 0.013 WWO-D-DUNFEEBL-BED1 2/22/2007 <0.0010 <0.0010 0.0010 0.0051 WWO-D-DUNFEEBL-BED1 10/26/2006 <0.0018 <0.0018 0.0018 0.0090 WWO-D-DUNFEEBL-BED1 8/21/2006 <0.0026 <0.0026 0.0026 0.013 WWO-D-DUNFEEBL-BED1-2 8/21/2006 <0.0026 <0.0026 0.0026 0.013 WWO-D-DUNFEEBL-PT 5/24/2006 0.577 0.555 0.0012 0.006 WWO-D-DUNFEEBL-BED1 5/24/2006 <0.0012 <0.0012 0.0012 0.006 DurstCK WWO-D-DURSTCK-PT 8/31/2010 0.061 0.059 0.0025 0.012 WWO-D-DURSTCK-BED1 8/31/2010 <0.0025 <0.0025 0.0025 0.012 WWO-D-DURSTCK-BED1 5/20/2010 <0.0038 <0.0038 0.0038 0.019 WWO-D-DURSTCK-BED1 3/16/2010 <0.0035 <0.0035 0.0035 0.018

11/3/10 Page 7 of 20 Table 4.5

### Table 4.5 Residential Treatment Results, Ohio - GAC System Samples Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

RESIDENT SAMPLE_NUMBER DATESMPL APFO (ug/L) PFOA (ug/L) *LOD (ug/L) *LOQ (ug/L)

WWO-D-DURSTCK-BED1 12/10/2009 <0.0021 <0.0021 0.0021 0.01 WWO-D-DURSTCK-PT 9/1/2009 0.076 0.073 0.0026 0.013 WWO-D-DURSTCK-BED1 9/1/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-DURSTCK-BED1 6/10/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-DURSTCK-BED1 3/4/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-DURSTCK-BED1 12/11/2008 <0.0017 <0.0017 0.0017 0.0085 WWO-D-DURSTCK-PT 9/10/2008 0.082 0.079 0.0023 0.012 WWO-D-DURSTCK-BED1 9/10/2008 <0.0023 <0.0023 0.0023 0.012 WWO-D-DURSTCK-BED1 5/28/2008 <0.0019 <0.0019 0.0019 0.0096 WWO-D-DURSTCK-BED1 2/26/2008 <0.0022 <0.0022 0.0022 0.011 WWO-D-DURSTCK-BED1 12/4/2007 <0.0031 <0.0031 0.0031 0.016 WWO-D-DURSTCK-PT 8/15/2007 0.1 0.098 0.0012 0.0062 WWO-D-DURSTCK-BED1 8/15/2007 <0.0012 <0.0012 0.0012 0.0062 WWO-D-DURSTCK-BED1 5/30/2007 <0.0027 <0.0027 0.0027 0.013 WWO-D-DURSTCK-BED1 2/23/2007 <0.0010 <0.0010 0.0010 0.0051 WWO-D-DURSTCK-BED1 12/7/2006 <0.0018 <0.0018 0.0018 0.0090 WWO-D-DURSTCK-BED1 8/16/2006 <0.0026 <0.0026 0.0026 0.013 WWO-D-DURSTCK-PT 5/24/2006 0.161 0.155 0.0012 0.006 WWO-D-DURSTCK-BED1 5/24/2006 <0.0012 <0.0012 0.0012 0.006 GivensDL WWO-D-GIVENSDL-PT 8/24/2010 <0.0025 <0.0025 0.0025 0.012 WWO-D-GIVENSDL-BED1 8/24/2010 <0.0025 <0.0025 0.0025 0.012 WWO-D-GIVENSDL-BED1 5/18/2010 <0.0038 <0.0038 0.0038 0.019 WWO-D-GIVENSDL-BED1 3/2/2010 <0.0035 <0.0035 0.0035 0.018 WWO-D-GIVENSDL-BED1 12/1/2009 <0.0021 <0.0021 0.0021 0.010 WWO-D-GIVENSDL-PT 8/10/2009 0.91 0.87 0.0026 0.013 WWO-D-GIVENSDL-BED1 8/10/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-GIVENSDL-BED1 5/8/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-GIVENSDL-BED1 2/9/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-GIVENSDL-BED1 11/11/2008 <0.0017 <0.0017 0.0017 0.0085 WWO-D-GIVENSDL-PT 7/31/2008 0.55 0.53 0.0023 0.012 WWO-D-GIVENSDL-BED1 7/31/2008 <0.0023 <0.0023 0.0023 0.012 WWO-D-GIVENSDL-BED1 4/8/2008 <0.0019 <0.0019 0.0019 0.0096 WWO-D-GIVENSDL-BED1 2/4/2008 <0.0022 <0.0022 0.0022 0.011 WWO-D-GIVENSDL-BED1 11/1/2007 <0.0031 <0.0031 0.0031 0.016 WWO-D-GIVENSDL-PT 7/26/2007 0.7 0.67 0.0012 0.0062 WWO-D-GIVENSDL-BED1 7/26/2007 <0.0012 <0.0012 0.0012 0.0062 WWO-D-GIVENSDL-BED1 5/9/2007 <0.0027 <0.0027 0.0027 0.013 WWO-D-GIVENSDL-BED1 1/31/2007 <0.0010 <0.0010 0.0010 0.0051 WWO-D-GIVENSDL-BED1 10/30/2006 <0.0018 <0.0018 0.0018 0.0090 WWO-D-GIVENSDL-BED1 8/15/2006 <0.0026 <0.0026 0.0026 0.013 WWO-D-GIVENSDL-PT 5/16/2006 0.63 0.605 0.0012 0.006 WWO-D-GIVENSDL-PT-2 5/16/2006 0.626 0.602 0.0012 0.006 WWO-D-GIVENSDL-BED1 5/16/2006 <0.0012 <0.0012 0.0012 0.006 GoudyRA WWO-D-GOUDYRA-PT 8/18/2010 0.020 0.019 0.0025 0.012 WWO-D-GOUDYRA-BED1 8/18/2010 <0.0025 <0.0025 0.0025 0.012 WWO-D-GOUDYRA-PT 9/23/2009 0.030 0.029 0.0033 0.016 WWO-D-GOUDYRA-BED1 9/23/2009 <0.0033 <0.0033 0.0033 0.016 WWO-D-GOUDYRA-BED1 6/22/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-GOUDYRA-BED1 2/11/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-GOUDYRA-BED1 12/18/2008 <0.0017 <0.0017 0.0017 0.0085 WWO-D-GOUDYRA-PT 9/4/2008 0.030 0.029 0.0023 0.012 WWO-D-GOUDYRA-BED1 9/4/2008 <0.0023 <0.0023 0.0023 0.012

11/3/10 Page 8 of 20 Table 4.5

### Table 4.5 Residential Treatment Results, Ohio - GAC System Samples Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

RESIDENT SAMPLE_NUMBER DATESMPL APFO (ug/L) PFOA (ug/L) *LOD (ug/L) *LOQ (ug/L)

WWO-D-GOUDYRA-BED1 6/5/2008 <0.0019 <0.0019 0.0019 0.0096 WWO-D-GOUDYRA-BED1 2/5/2008 <0.0022 <0.0022 0.0022 0.011 WWO-D-GOUDYRA-BED1 11/12/2007 <0.0031 <0.0031 0.0031 0.016 WWO-Z-GOUDYRA-PT 9/20/2007 0.030 0.029 0.0031 0.016 WWO-Z-GOUDYRA-BED1 9/20/2007 <0.0031 <0.0031 0.0031 0.016 WWO-D-GOUDYRA-BED1 6/18/2007 <0.0027 <0.0027 0.0027 0.013 WWO-D-GOUDYRA-BED1 2/2/2007 <0.0010 <0.0010 0.0010 0.0051 WWO-D-GOUDYRA-BED1 11/2/2006 <0.0018 <0.0018 0.0018 0.0090 WWO-D-GOUDYRA-BED1 8/17/2006 <0.0026 <0.0026 0.0026 0.013 WWO-D-GOUDYRA-PT 5/15/2006 0.0578 0.0556 0.00098 0.0049 WWO-D-GOUDYRA-BED1 5/15/2006 <0.00098 <0.00098 0.00098 0.0049 HarrahGC WWO-D-HARRAHGC-PT 9/7/2010 2.2 2.1 0.025 0.12 WWO-D-HARRAHGC-BED1 9/7/2010 <0.0025 <0.0025 0.0025 0.012 WWO-D-HARRAHGC-BED1 5/24/2010 <0.0038 <0.0038 0.0038 0.019 WWO-D-HARRAHGC-BED1 3/3/2010 <0.0035 <0.0035 0.0035 0.018 WWO-D-HARRAHGC-BED1 12/9/2009 <0.0021 <0.0021 0.0021 0.01 WWO-D-HARRAHGC-PT 8/25/2009 2.1 2.0 0.026 0.13 WWO-D-HARRAHGC-BED1 8/25/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-HARRAHGC-BED1 6/3/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-HARRAHGC-BED1 2/16/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-HARRAHGC-BED1 12/17/2008 <0.0017 <0.0017 0.0017 0.0085 WWO-D-HARRAHGC-PT 9/4/2008 1.4 1.3 0.023 0.12 WWO-D-HARRAHGC-BED1 9/4/2008 <0.0023 <0.0023 0.0023 0.012 WWO-D-HARRAHGC-BED1 6/4/2008 NQ NQ 0.0019 0.0096 WWO-D-HARRAHGC-BED2 6/4/2008 <0.0019 <0.0019 0.0019 0.0096 WWO-D-HARRAHGC-BED1 3/10/2008 <0.0022 <0.0022 0.0022 0.011 WWO-D-HARRAHGC-BED1 11/20/2007 <0.0031 <0.0031 0.0031 0.016 WWO-D-HARRAHGC-PT 8/8/2007 1.6 1.5 0.012 0.062 WWO-D-HARRAHGC-BED1 8/8/2007 <0.0012 <0.0012 0.0012 0.0062 WWO-D-HARRAHGC-BED1 5/21/2007 <0.0027 <0.0027 0.0027 0.013 WWO-D-HARRAHGC-BED1 3/26/2007 <0.0027 <0.0027 0.0027 0.013 WWO-D-HARRAHGC-BED1 12/7/2006 <0.0018 <0.0018 0.0018 0.0090 WWO-D-HARRAHGC-BED1 8/10/2006 <0.0016 <0.0016 0.0016 0.0078 WWO-D-HARRAHGC-BED1-2 8/10/2006 <0.0016 <0.0016 0.0016 0.0078 WWO-D-HARRAHGC-PT 5/11/2006 2.07 1.99 0.012 0.06 WWO-D-HARRAHGC-BED1 5/11/2006 <0.0012 <0.0012 0.0012 0.006 HornbeckKL WWO-D-HORNBECKKL-PT 8/18/2010 1.9 1.8 0.025 0.12 WWO-D-HORNBECKKL-BED1 8/18/2010 <0.0025 <0.0025 0.0025 0.012 WWO-D-HORNBECKKL-BED1 5/17/2010 <0.0038 <0.0038 0.0038 0.019 WWO-D-HORNBECKKL-BED1 3/2/2010 <0.0035 <0.0035 0.0035 0.018 WWO-D-HORNBECKKL-BED1 12/1/2009 <0.0021 <0.0021 0.0021 0.010 WWO-D-HORNBECKKL-PT 7/29/2009 1.5 1.4 0.026 0.13 WWO-D-HORNBECKKL-BED1 7/29/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-HORNBECKKL-BED1 5/5/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-HORNBECKKL-BED1 2/10/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-HORNBECKKL-BED1 11/11/2008 NQ NQ 0.0017 0.0085 WWO-D-HORNBECKKL-BED2 11/11/2008 NQ NQ 0.0017 0.0085 WWO-D-HORNBECKKL-PT 7/31/2008 0.93 0.89 0.0023 0.012 WWO-D-HORNBECKKL-PT-2 7/31/2008 0.90 0.86 0.0023 0.012 WWO-D-HORNBECKKL-BED1 7/31/2008 <0.0023 <0.0023 0.0023 0.012 WWO-D-HORNBECKKL-BED1-2 7/31/2008 <0.0023 <0.0023 0.0023 0.012 WWO-D-HORNBECKKL-BED1 4/8/2008 <0.0019 <0.0019 0.0019 0.0096

11/3/10 Page 9 of 20 Table 4.5

### Table 4.5 Residential Treatment Results, Ohio - GAC System Samples Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

RESIDENT SAMPLE_NUMBER DATESMPL APFO (ug/L) PFOA (ug/L) *LOD (ug/L) *LOQ (ug/L)

WWO-D-HORNBECKKL-BED1 2/5/2008 <0.0022 <0.0022 0.0022 0.011 WWO-D-HORNBECKKL-BED1 11/1/2007 <0.0031 <0.0031 0.0031 0.016 WWO-D-HORNBECKKL-PT 7/25/2007 0.96 0.92 0.012 0.062 WWO-D-HORNBECKKL-BED1 7/25/2007 <0.0012 <0.0012 0.0012 0.0062 WWO-D-HORNBECKKL-BED1 5/9/2007 <0.0027 <0.0027 0.0027 0.013 WWO-D-HORNBECKKL-BED1 1/31/2007 <0.0010 <0.0010 0.0010 0.0051 WWO-D-HORNBECKKL-BED1 10/30/2006 <0.0018 <0.0018 0.0018 0.0090 WWO-D-HORNBECKKL-PT 8/15/2006 0.80 0.77 0.0026 0.013 WWO-D-HORNBECKKL-BED1 8/15/2006 <0.0026 <0.0026 0.0026 0.013 KetelsonD WWO-D-KETELSEND-PT 8/18/2010 0.20 0.19 0.0025 0.012 WWO-D-KETELSEND-BED1 8/18/2010 <0.0025 <0.0025 0.0025 0.012 WWO-D-KETELSEND-BED1 5/17/2010 <0.0038 <0.0038 0.0038 0.019 WWO-D-KETELSEND-BED1 3/2/2010 <0.0035 <0.0035 0.0035 0.018 WWO-D-KETELSEND-BED1 12/1/2009 <0.0021 <0.0021 0.0021 0.010 WWO-D-KETELSEND-PT 7/29/2009 0.22 0.21 0.0026 0.013 WWO-D-KETELSEND-BED1 7/29/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-KETELSEND-BED1 5/5/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-KETELSEND-BED1 2/10/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-KETELSEND-BED1 11/11/2008 NQ NQ 0.0017 0.0085 WWO-D-KETELSEND-BED2 11/11/2008 <0.0017 <0.0017 0.0017 0.0085 WWO-D-KETELSEND-PT 7/31/2008 0.18 0.17 0.0023 0.012 WWO-D-KETELSEND-BED1 7/31/2008 NQ NQ 0.0023 0.012 WWO-D-KETELSEND-BED2 7/31/2008 <0.0023 <0.0023 0.0023 0.012 WWO-D-KETELSEND-BED1 4/8/2008 NQ NQ 0.0019 0.0096 WWO-D-KETELSEND-BED2 4/8/2008 NQ NQ 0.0019 0.0096 WWO-D-KETELSOND-BED1 2/4/2008 NQ NQ 0.0022 0.011 WWO-D-KETELSOND-BED2 2/4/2008 NQ NQ 0.0022 0.011 WWO-D-KETELSOND-BED1 11/1/2007 NQ NQ 0.0031 0.016 WWO-D-KETELSOND-BED2 11/1/2007 NQ NQ 0.0031 0.016 WWO-D-KETELSOND-PT 7/24/2007 0.24 0.23 0.0012 0.0062 WWO-D-KETELSOND-BED1 7/24/2007 NQ NQ 0.0012 0.0062 WWO-D-KETELSOND-BED2 7/24/2007 NQ NQ 0.0012 0.0062 WWO-D-KETELSOND-BED1 5/9/2007 NQ NQ 0.0027 0.013 WWO-D-KETELSOND-BED2 5/9/2007 <0.0027 <0.0027 0.0027 0.013 WWO-D-KETELSOND-BED1 1/31/2007 <0.0010 <0.0010 0.0010 0.0051 WWO-D-KETELSOND-BED1 10/30/2006 NQ NQ 0.0018 0.0090 WWO-D-KETELSOND-BED2 10/30/2006 <0.0018 <0.0018 0.0018 0.0090 WWO-D-KETELSOND-BED1 8/17/2006 <0.0026 <0.0026 0.0026 0.013 WWO-D-KETELSONDA-PT 5/24/2006 0.137 0.132 0.0012 0.006 WWO-D-KETELSONDA-BED1 5/24/2006 <0.0012 <0.0012 0.0012 0.006 KnottsC WWO-D-KNOTTSC-PT 9/1/2010 3.6 3.5 0.025 0.12 WWO-D-KNOTTSC-BED1 9/1/2010 <0.0025 <0.0025 0.0025 0.012 WWO-D-KNOTTSC-BED1 5/26/2010 NQ NQ 0.0038 0.019 WWO-D-KNOTTSC-BED2 5/26/2010 <0.0038 <0.0038 0.0038 0.019 WWO-D-KNOTTSC-BED1 2/22/2010 <0.0035 <0.0035 0.0035 0.018 WWO-D-KNOTTSC-PT 12/1/2009 3.0 2.9 0.021 0.10 WWO-D-KNOTTSC-BED1 12/1/2009 NQ NQ 0.0021 0.010 WWO-D-KNOTTSC-BED2 12/1/2009 NQ NQ 0.0021 0.010 WWO-D-KNOTTSC-BED1 6/25/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-KNOTTSC-BED1 3/5/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-KNOTTSC-BED1 12/16/2008 <0.0017 <0.0017 0.0017 0.0085 WWO-D-KNOTTSC-PT 9/23/2008 2.9 2.8 0.017 0.085

11/3/10 Page 10 of 20 Table 4.5

### Table 4.5 Residential Treatment Results, Ohio - GAC System Samples Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

RESIDENT SAMPLE_NUMBER DATESMPL APFO (ug/L) PFOA (ug/L) *LOD (ug/L) *LOQ (ug/L) WWO-D-KNOTTSC-BED1 9/23/2008 NQ NQ 0.0017 0.0085 WWO-D-KNOTTSC-BED2 9/23/2008 NQ NQ 0.0017 0.0085 WWO-D-KNOTTSC-BED1 6/17/2008 <0.0019 <0.0019 0.0019 0.0096 WWO-D-KNOTTSC-BED1 2/25/2008 NQ NQ 0.0022 0.011 WWO-D-KNOTTSC-BED2 2/25/2008 <0.0022 <0.0022 0.0022 0.011 WWO-D-KNOTTSC-BED1 11/20/2007 NQ NQ 0.0031 0.016 WWO-D-KNOTTSC-BED2 11/20/2007 <0.0031 <0.0031 0.0031 0.016 WWO-D-KNOTTSC-PT 8/31/2007 2.6 2.5 0.012 0.062 WWO-D-KNOTTSC-BED1 8/31/2007 NQ NQ 0.0012 0.0062 WWO-D-KNOTTSC-BED2 8/31/2007 NQ NQ 0.0012 0.0062 WWO-D-KNOTTSC-BED1 6/29/2007 NQ NQ 0.0012 0.0062 WWO-D-KNOTTSC-BED2 6/29/2007 <0.0012 <0.0012 0.0012 0.0062 WWO-D-KNOTTSC-BED1 5/30/2007 <0.0027 <0.0027 0.0027 0.013 WWO-D-KNOTTSC-BED1 4/25/2007 <0.0027 <0.0027 0.0027 0.013 WWO-D-KNOTTSC-BED1 3/29/2007 <0.0027 <0.0027 0.0027 0.013 WWO-D-KNOTTSC-BED1-2 3/29/2007 <0.0027 <0.0027 0.0027 0.013 WWO-D-KNOTTSC-BED1 2/16/2007 NQ NQ 0.0010 0.0051 WWO-D-KNOTTSC-BED2 2/16/2007 NQ NQ 0.0010 0.0051 WWO-D-KNOTTSC-BED1 12/22/2006 NQ NQ 0.0010 0.0051 WWO-D-KNOTTSC-BED2 12/22/2006 NQ NQ 0.0010 0.0051 WWO-D-KNOTTSC-BED1 8/24/2006 <0.0026 <0.0026 0.0026 0.013 WWO-D-KNOTTSC-PT 6/14/2006 2.13 2.05 0.012 0.06 WWO-D-KNOTTSC-BED1 6/14/2006 <0.0012 <0.0012 0.0012 0.006 LewisR WWO-D-LEWISR-PT 8/30/2010 2.1 2.0 0.025 0.12 WWO-D-LEWISR-BED1 8/30/2010 <0.0025 <0.0025 0.0025 0.012 WWO-D-LEWISR-BED1 5/26/2010 <0.0038 <0.0038 0.0038 0.019 WWO-D-LEWISR-BED1 3/4/2010 <0.0035 <0.0035 0.0035 0.018 WWO-D-LEWISR-BED1 12/8/2009 <0.0033 <0.0033 0.0033 0.016 WWO-D-LEWISR-PT 8/25/2009 2.2 2.1 0.026 0.13 WWO-D-LEWISR-BED1 8/25/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-LEWISR-BED1 6/4/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-LEWISR-BED1 2/24/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-LEWISR-BED1 12/17/2008 NQ NQ 0.0017 0.0085 WWO-D-LEWISR-BED2 12/17/2008 NQ NQ 0.0026 0.013 WWO-D-LEWISR-PT 9/4/2008 1.5 1.4 0.023 0.12 WWO-D-LEWISR-BED1 9/4/2008 NQ NQ 0.0023 0.012 WWO-D-LEWISR-BED1 6/20/2008 <0.0019 <0.0019 0.0019 0.0096 WWO-D-LEWISR-BED1 2/14/2008 <0.0022 <0.0022 0.0022 0.011 WWO-D-LEWISR-BED1 11/20/2007 NQ NQ 0.0031 0.016 WWO-D-LEWISR-BED2 11/20/2007 NQ NQ 0.0031 0.016 WWO-D-LEWISR-PT 8/9/2007 1.6 1.5 0.012 0.062 WWO-D-LEWISR-BED1 8/9/2007 <0.0012 <0.0012 0.0012 0.0062 WWO-D-LEWISR-BED1 5/24/2007 <0.0027 <0.0027 0.0027 0.013 WWO-D-LEWISR-BED1 2/16/2007 <0.0010 <0.0010 0.0010 0.0051 WWO-D-LEWISR-BED1 1/18/2007 NQ NQ 0.0010 0.0051 WWO-D-LEWISR-BED2 1/18/2007 <0.0010 <0.0010 0.0010 0.0051 WWO-D-LEWISR-BED1 12/12/2006 <0.0018 <0.0018 0.0018 0.0090 WWO-D-LEWISR-BED1 11/9/2006 <0.0018 <0.0018 0.0018 0.0090 WWO-D-LEWISR-BED1 10/11/2006 <0.0018 <0.0018 0.0018 0.0090 WWO-D-LEWISR-BED1 9/6/2006 <0.0026 <0.0026 0.0026 0.013 WWO-D-LEWISR-BED1-2 9/6/2006 <0.0026 <0.0026 0.0026 0.013 WWO-D-LEWISR-BED1 8/8/2006 <0.0016 <0.0016 0.0016 0.0078

11/3/10 Page 11 of 20 Table 4.5

### Table 4.5 Residential Treatment Results, Ohio - GAC System Samples Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

RESIDENT SAMPLE_NUMBER DATESMPL APFO (ug/L) PFOA (ug/L) *LOD (ug/L) *LOQ (ug/L)

WWO-D-LEWISR-BED1 7/7/2006 <0.0026 <0.0026 0.0026 0.013 WWO-D-LEWISR-PT 5/12/2006 1.63 1.57 0.012 0.06 WWO-D-LEWISR-BED1 5/12/2006 NQ NQ 0.0012 0.006 WWO-D-LEWISR-BED2 5/12/2006 <0.0012 <0.0012 0.0012 0.006 MathenyTL WWO-D-1475WASHINGTONBLVD-BED1 6/29/2010 <0.0025 <0.0025 0.0025 0.012 WWO-D-1475WASHINGTONBLVD-BED1 3/17/2010 NQ NQ 0.0035 0.018 WWO-D-1475WASHINGTONBLVD-BED2 3/17/2010 <0.0035 <0.0035 0.0035 0.018 WWO-D-1475WASHINGTONBLVD-BED1 12/16/2009 <0.0033 <0.0033 0.0033 0.016 WWO-D-MATHENYTL-PT 9/24/2009 0.76 0.73 0.0033 0.016 WWO-D-MATHENYTL-BED1 9/24/2009 <0.0033 <0.0033 0.0033 0.016 WWO-D-MATHENYTL-BED1 6/25/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-MATHENYTL-BED1 2/11/2009 NQ NQ 0.0026 0.013 WWO-D-MATHENYTL-BED2 2/11/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-MATHENYTL-BED1 11/11/2008 <0.0017 <0.0017 0.0017 0.0085 WWO-D-MATHENYTL-PT 9/3/2008 0.54 0.52 0.0023 0.012 WWO-D-MATHENYTL-BED1 9/3/2008 <0.0023 <0.0023 0.0023 0.012 WWO-D-MATHENYTL-BED1 4/9/2008 <0.0019 <0.0019 0.0019 0.0096 WWO-D-MATHENYTL-BED1 2/6/2008 <0.0022 <0.0022 0.0022 0.011 WWO-D-MATHENYTL-BED1 11/14/2007 <0.0031 <0.0031 0.0031 0.016 WWO-D-MATHENYTL-PT 8/2/2007 0.62 0.60 0.0012 0.0062 WWO-D-MATHENYTL-BED1 8/2/2007 <0.0012 <0.0012 0.0012 0.0062 WWO-D-MATHENYTL-BED1 5/15/2007 <0.0027 <0.0027 0.0027 0.013 WWO-D-MATHENYTL-BED1 1/31/2007 <0.0010 <0.0010 0.0010 0.0051 WWO-D-MATHENYTL-BED1 11/2/2006 <0.0018 <0.0018 0.0018 0.0090 WWO-D-MATHENYTL-BED1-2 11/2/2006 <0.0018 <0.0018 0.0018 0.0090 WWO-D-MATHENYTL-BED1 8/15/2006 <0.0026 <0.0026 0.0026 0.013 WWO-D-MATHENYTL-PT 5/16/2006 0.604 0.58 0.0012 0.006 WWO-D-MATHENYTL-BED1 5/16/2006 <0.0012 <0.0012 0.0012 0.006 MummaE WWO-D-MUMMAE-PT 9/1/2010 0.18 0.17 0.0025 0.012 WWO-D-MUMMAE-PT-2 9/1/2010 0.18 0.17 0.0025 0.012 WWO-D-MUMMAE-BED1 9/1/2010 <0.0025 <0.0025 0.0025 0.012 WWO-D-MUMMAE-BED1-2 9/1/2010 <0.0025 <0.0025 0.0025 0.012 WWO-D-MUMMAE-BED1 5/24/2010 <0.0038 <0.0038 0.0038 0.019 WWO-D-MUMMAE-BED1 3/10/2010 <0.0035 <0.0035 0.0035 0.018 WWO-D-MUMMAE-BED1 12/7/2009 <0.0033 <0.0033 0.0033 0.016 WWO-D-MUMMAE-PT 8/25/2009 0.11 0.11 0.0026 0.013 WWO-D-MUMMAE-BED1 8/25/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-MUMMAE-BED1 6/4/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-MUMMAE-BED1 2/17/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-MUMMAE-BED1 10/27/2008 <0.0017 <0.0017 0.0017 0.0085 WWO-D-MUMMAE-PT 7/21/2008 0.096 0.092 0.0023 0.012 WWO-D-MUMMAE-BED1 7/21/2008 <0.0023 <0.0023 0.0023 0.012 WWO-D-MUMMAE-BED1 6/5/2008 <0.0019 <0.0019 0.0019 0.0096 WWO-D-MUMMAE-BED1 2/26/2008 <0.0022 <0.0022 0.0022 0.011 WWO-D-MUMMAE-BED1 11/20/2007 <0.0031 <0.0031 0.0031 0.016 WWO-D-MUMMAE-PT 8/9/2007 0.14 0.13 0.0012 0.0062 WWO-D-MUMMAE-BED1 8/9/2007 <0.0012 <0.0012 0.0012 0.0062 WWO-D-MUMMAE-BED1 5/24/2007 <0.0027 <0.0027 0.0027 0.013 WWO-D-MUMMAE-BED1-2 5/24/2007 <0.0027 <0.0027 0.0027 0.013 WWO-D-MUMMAE-BED1 2/20/2007 <0.0010 <0.0010 0.0010 0.0051 WWO-D-MUMMAE-BED1 12/8/2006 <0.0018 <0.0018 0.0018 0.0090 WWO-D-MUMMAE-PT 8/30/2006 0.20 0.19 0.0026 0.013

11/3/10 Page 12 of 20 Table 4.5

### Table 4.5 Residential Treatment Results, Ohio - GAC System Samples Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

RESIDENT SAMPLE_NUMBER DATESMPL APFO (ug/L) PFOA (ug/L) *LOD (ug/L) *LOQ (ug/L)

WWO-D-MUMMAE-BED1 8/30/2006 <0.0026 <0.0026 0.0026 0.013 NewlunM WWO-D-NEWLUNM-PT 8/31/2010 0.14 0.13 0.0025 0.012 WWO-D-NEWLUNM-BED1 8/31/2010 <0.0025 <0.0025 0.0025 0.012 WWO-D-NEWLUNM-BED1 5/20/2010 <0.0038 <0.0038 0.0038 0.019 WWO-D-NEWLUNM-BED1 1/27/2010 <0.0035 <0.0035 0.0035 0.018 WWO-D-NEWLUNM-BED1 12/10/2009 <0.0021 <0.0021 0.0021 0.01 WWO-D-NEWLUNM-PT 9/1/2009 0.15 0.14 0.0026 0.013 WWO-D-NEWLUNM-BED1 9/1/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-NEWLUNM-BED1 6/10/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-NEWLUNM-BED1 3/4/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-NEWLUNM-BED1 12/11/2008 <0.0017 <0.0017 0.0017 0.0085 WWO-D-NEWLUNM-PT 9/10/2008 0.20 0.19 0.0023 0.012 WWO-D-NEWLUNM-PT-2 9/10/2008 0.20 0.19 0.0023 0.012 WWO-D-NEWLUNM-BED1 9/10/2008 <0.0023 <0.0023 0.0023 0.012 WWO-D-NEWLUNM-BED1-2 9/10/2008 <0.0023 <0.0023 0.0023 0.012 WWO-D-NEWLUNM-BED1 5/28/2008 <0.0019 <0.0019 0.0019 0.0096 WWO-D-NEWLUNM-BED1 2/26/2008 NQ NQ 0.0022 0.011 WWO-D-NEWLUNM-BED2 2/26/2008 <0.0022 <0.0022 0.0022 0.011 WWO-D-NEWLUNM-BED1 12/4/2007 <0.0031 <0.0031 0.0031 0.016 WWO-D-NEWLUNM-PT 8/15/2007 0.21 0.20 0.0012 0.0062 WWO-D-NEWLUNM-BED1 8/15/2007 <0.0012 <0.0012 0.0012 0.0062 WWO-D-NEWLUNM-BED1 5/30/2007 <0.0027 <0.0027 0.0027 0.013 WWO-D-NEWLUNM-BED1 2/23/2007 <0.0010 <0.0010 0.0010 0.0051 WWO-D-NEWLUNM-BED1 12/7/2006 <0.0018 <0.0018 0.0018 0.0090 WWO-D-NEWLUNM-BED1 8/16/2006 <0.0026 <0.0026 0.0026 0.013 WWO-D-NEWLUNM-PT 6/20/2006 0.3 0.288 0.0012 0.006 WWO-D-NEWLUNM-BED1 6/20/2006 NQ NQ 0.0012 0.006 WWO-D-NEWLUNM-BED2 6/20/2006 <0.0026 <0.0026 0.0026 0.013 OursS WWO-D-OURSS-PT 8/31/2010 0.023 0.022 0.0025 0.012 WWO-D-OURSS-BED1 8/31/2010 <0.0025 <0.0025 0.0025 0.012 WWO-D-OURSS-BED1 5/20/2010 <0.0038 <0.0038 0.0038 0.019 WWO-D-OURSS-BED1 1/27/2010 <0.0035 <0.0035 0.0035 0.018 WWO-D-OURSS-BED1 12/10/2009 <0.0021 <0.0021 0.0021 0.01 WWO-D-OURSS-PT 9/1/2009 0.020 0.019 0.0026 0.013 WWO-D-OURSS-BED1 9/1/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-OURSS-BED1 6/10/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-OURSS-BED1 3/4/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-OURSS-BED1 12/11/2008 <0.0017 <0.0017 0.0017 0.0085 WWO-D-OURSS-PT 9/10/2008 0.021 0.020 0.0023 0.012 WWO-D-OURSS-BED1 9/10/2008 <0.0023 <0.0023 0.0023 0.012 WWO-D-OURSS-BED1 5/28/2008 <0.0019 <0.0019 0.0019 0.0096 WWO-D-OURSS-BED1 2/26/2008 <0.0022 <0.0022 0.0022 0.011 WWO-D-OURSS-BED1 12/7/2007 <0.0031 <0.0031 0.0031 0.016 WWO-D-OURSS-PT 8/15/2007 0.045 0.043 0.0012 0.0062 WWO-D-OURSS-BED1 8/15/2007 <0.0012 <0.0012 0.0012 0.0062 WWO-D-OURSS-BED1 5/30/2007 <0.0027 <0.0027 0.0027 0.013 WWO-D-OURSD-BED1 2/23/2007 <0.0010 <0.0010 0.0010 0.0051 WWO-D-OURSS-BED1 12/7/2006 <0.0018 <0.0018 0.0018 0.0090 WWO-D-OURSS-BED1 8/14/2006 <0.0026 <0.0026 0.0026 0.013 WWO-D-OURSS-BED2 7/23/2006 <0.0026 <0.0026 0.0026 0.013 WWO-D-OURSS-PT 6/23/2006 0.026 0.025 0.0026 0.013 WWO-D-OURSS-BED1 6/23/2006 NQ NQ 0.0026 0.013

11/3/10 Page 13 of 20 Table 4.5

### Table 4.5 Residential Treatment Results, Ohio - GAC System Samples Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

RESIDENT SAMPLE_NUMBER DATESMPL APFO (ug/L) PFOA (ug/L) *LOD (ug/L) *LOQ (ug/L)

ParsonsCF WWO-D-PARSONSCF-PT 8/30/2010 14 13 0.25 1.2 WWO-D-PARSONSCF-BED1 8/30/2010 NQ NQ 0.0025 0.012 WWO-D-PARSONSCF-BED2 8/30/2010 <0.0025 <0.0025 0.0025 0.012 WWO-D-PARSONSCF-BED1 5/24/2010 <0.0038 <0.0038 0.0038 0.019 WWO-D-PARSONSCF-BED1 3/3/2010 <0.0035 <0.0035 0.0035 0.018 WWO-D-PARSONSCF-BED1 12/10/2009 <0.0021 <0.0021 0.0021 0.01 WWO-D-PARSONSCF-PT 9/1/2009 11 11 0.026 0.13 WWO-D-PARSONSCF-BED1 9/1/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-PARSONSCF-BED1 6/3/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-PARSONSCF-BED1 6/3/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-PARSONSCF-BED1 2/16/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-PARSONSCF-BED1 12/17/2008 <0.0017 <0.0017 0.0017 0.0085 WWO-D-PARSONSCF-PT 9/2/2008 9.7 9.3 0.023 0.12 WWO-D-PARSONSCF-BED1 9/2/2008 <0.0023 <0.0023 0.0023 0.012 WWO-D-PARSONSCF-BED1 6/4/2008 NQ NQ 0.0019 0.0096 WWO-D-PARSONSCF-BED2 6/4/2008 <0.0019 <0.0019 0.0019 0.0096 WWO-D-PARSONSCF-BED1 2/14/2008 <0.0022 <0.0022 0.0022 0.011 WWO-D-PARSONSCF-BED1 11/19/2007 <0.0031 <0.0031 0.0031 0.016 WWO-D-PARSONSCF-PT 8/9/2007 10 10 0.012 0.062 WWO-D-PARSONSCF-BED1 8/9/2007 <0.0012 <0.0012 0.0012 0.0062 WWO-D-PARSONSCF-BED1 5/16/2007 <0.0027 <0.0027 0.0027 0.013 WWO-D-PARSONSCF-BED1 2/15/2007 <0.0010 <0.0010 0.0010 0.0051 WWO-D-PARSONSCF-BED1 1/17/2007 NQ NQ 0.0010 0.0051 WWO-D-PARSONSCF-BED2 1/17/2007 <0.0010 <0.0010 0.0010 0.0051 WWO-D-PARSONSCF-BED1 12/12/2006 <0.0018 <0.0018 0.0018 0.0090 WWO-D-PARSONSCF-BED1 11/7/2006 <0.0018 <0.0018 0.0018 0.0090 WWO-D-PARSONSCF-BED1 10/11/2006 <0.0018 <0.0018 0.0018 0.0090 WWO-D-PARSONSCF-BED1 9/6/2006 <0.0026 <0.0026 0.0026 0.013 WWO-D-PARSONSCF-BED1 8/8/2006 <0.0016 <0.0016 0.0016 0.0078 WWO-D-PARSONSCF-BED1 7/7/2006 <0.0026 <0.0026 0.0026 0.013 WWO-D-PARSONSCF-PT 5/12/2006 14.2 13.6 0.12 0.6 WWO-D-PARSONSCF-BED1 5/12/2006 NQ NQ 0.0012 0.006 WWO-D-PARSONSCF-BED2 5/12/2006 <0.0012 <0.0012 0.0012 0.006 PriceFL WWO-D-PRICEFL-PT 8/25/2010 1.9 1.8 0.025 0.12 WWO-D-PRICEFL-BED1 8/25/2010 <0.0025 <0.0025 0.0025 0.012 WWO-D-PRICEFL-BED1 5/18/2010 <0.0038 <0.0038 0.0038 0.019 WWO-D-PRICEFL-BED1 3/2/2010 <0.0035 <0.0035 0.0035 0.018 WWO-D-PRICEFL-BED1 12/1/2009 <0.0021 <0.0021 0.0021 0.010 WWO-D-PRICEFL-PT 8/13/2009 1.8 1.7 0.026 0.13 WWO-D-PRICEFL-BED1 8/13/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-PRICEFL-BED1 5/8/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-PRICEFL-BED1 2/9/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-PRICEFL-BED1 11/11/2008 <0.0017 <0.0017 0.0017 0.0085 WWO-D-PRICEFL-PT 9/11/2008 1.2 1.2 0.023 0.12 WWO-D-PRICEFL-BED1 9/11/2008 <0.0023 <0.0023 0.0023 0.012 WWO-D-PRICEFL-BED1 4/9/2008 <0.0019 <0.0019 0.0019 0.0096 WWO-D-PRICEFL-BED1 2/5/2008 <0.0022 <0.0022 0.0022 0.011 WWO-D-PRICEFL-BED1 11/1/2007 <0.0031 <0.0031 0.0031 0.016 WWO-D-PRICEFL-PT 8/3/2007 1.4 1.3 0.012 0.062 WWO-D-PRICEFL-BED1 8/3/2007 <0.0012 <0.0012 0.0012 0.0062 WWO-D-PRICEFL-BED1 5/9/2007 <0.0027 <0.0027 0.0027 0.013 WWO-D-PRICEFL-BED1 2/1/2007 <0.0010 <0.0010 0.0010 0.0051

11/3/10 Page 14 of 20 Table 4.5

### Table 4.5 Residential Treatment Results, Ohio - GAC System Samples Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

RESIDENT SAMPLE_NUMBER DATESMPL APFO (ug/L) PFOA (ug/L) *LOD (ug/L) *LOQ (ug/L)

WWO-D-PRICEFL-BED1 12/11/2006 <0.0018 <0.0018 0.0018 0.0090 WWO-D-PRICEFL-BED1 8/17/2006 <0.0026 <0.0026 0.0026 0.013 WWO-D-PRICEFL-PT 5/17/2006 1.22 1.17 0.012 0.06 WWO-D-PRICEFL-BED1 5/17/2006 <0.0012 <0.0012 0.0012 0.006 Riggins1833 WWO-D-RIGGINS1833-PT 8/25/2010 0.23 0.22 0.0025 0.012 WWO-D-RIGGINS1833-BED1 8/25/2010 <0.0025 <0.0025 0.0025 0.012 WWO-D-RIGGINS1833-BED1 5/24/2010 <0.0038 <0.0038 0.0038 0.019 WWO-D-RIGGINS1833-BED1 3/4/2010 <0.0035 <0.0035 0.0035 0.018 WWO-D-RIGGINS1833-BED1 12/7/2009 <0.0033 <0.0033 0.0033 0.016 WWO-D-RIGGINS1833-PT 8/25/2009 0.23 0.22 0.0026 0.013 WWO-D-RIGGINS1833-BED1 8/25/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-RIGGINS1833-BED1 6/3/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-RIGGINS1833-BED1 3/17/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-RIGGINS1833-BED1 12/1/2008 <0.0017 <0.0017 0.0017 0.0085 WWO-D-RIGGINS1833-PT 9/22/2008 0.15 0.14 0.0017 0.0085 WWO-D-RIGGINS1833-BED1 9/22/2008 <0.0017 <0.0017 0.0017 0.0085 WWO-D-RIGGINS1833-BED1 6/5/2008 <0.0019 <0.0019 0.0019 0.0096 WWO-D-RIGGINS1833-BED1 2/13/2008 <0.0022 <0.0022 0.0022 0.011 WWO-D-RIGGINS1833-BED1 11/19/2007 <0.0031 <0.0031 0.0031 0.016 WWO-D-RIGGINS1833-PT 8/8/2007 0.15 0.14 0.0012 0.0062 WWO-D-RIGGINS1833-BED1 8/8/2007 <0.0012 <0.0012 0.0012 0.0062 WWO-D-RIGGINS1833-BED1 5/16/2007 <0.0027 <0.0027 0.0027 0.013 WWO-D-RIGGINS1833-BED1 2/16/2007 NQ NQ 0.0010 0.0051 WWO-D-RIGGINS1833-BED2 2/16/2007 <0.0010 <0.0010 0.0010 0.0051 WWO-D-RIGGINS1833-BED1 12/6/2006 <0.0018 <0.0018 0.0018 0.0090 WWO-D-RIGGINS1833-BED1 8/21/2006 <0.0026 <0.0026 0.0026 0.013 WWO-D-RIGGINS1833-PT 6/22/2006 0.158 0.152 0.0026 0.013 WWO-D-RIGGINS1833-BED1 6/22/2006 <0.0026 <0.0026 0.0026 0.013 Riggins1922 WWO-D-RIGGINS1922-PT 8/25/2010 1.4 1.3 0.025 0.12 WWO-D-RIGGINS1922-BED1 8/25/2010 NQ NQ 0.0025 0.012 WWO-D-RIGGINS1922-BED2 8/25/2010 NQ NQ 0.0025 0.012 WWO-D-RIGGINS1922-BED1 5/24/2010 NQ NQ 0.0038 0.019 WWO-D-RIGGINS1922-BED2 5/24/2010 <0.0038 <0.0038 0.0038 0.019 WWO-D-RIGGINS1922-BED1 3/4/2010 NQ NQ 0.0035 0.018 WWO-D-RIGGINS1922-BED2 3/4/2010 <0.0035 <0.0035 0.0035 0.018 WWO-D-RIGGINS1922-BED1 12/7/2009 <0.0033 <0.0033 0.0033 0.016 WWO-D-RIGGINS1922-PT 8/25/2009 0.070 0.067 0.0026 0.013 WWO-D-RIGGINS1922-BED1 8/25/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-RIGGINS1922-BED1 6/3/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-RIGGINS1922-BED1 3/17/2009 NQ NQ 0.0026 0.013 WWO-D-RIGGINS1922-BED2 3/17/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-RIGGINS1922-BED1 12/1/2008 NQ NQ 0.0017 0.0085 WWO-D-RIGGINS1922-BED2 12/1/2008 <0.0017 <0.0017 0.0017 0.0085 WWO-D-RIGGINS1922-PT 9/22/2008 0.55 0.53 0.0017 0.0085 WWO-D-RIGGINS1922-BED1 9/22/2008 NQ NQ 0.0017 0.0085 WWO-D-RIGGINS1922-BED2 9/22/2008 <0.0017 <0.0017 0.0017 0.0085 WWO-D-RIGGINS1922-BED1 6/5/2008 NQ NQ 0.0019 0.0096 WWO-D-RIGGINS1922-BED2 6/5/2008 <0.0019 <0.0019 0.0019 0.0096 WWO-D-RIGGINS1922-BED1 2/13/2008 <0.0022 <0.0022 0.0022 0.011 WWO-D-RIGGINS1922-BED1 11/19/2007 <0.0031 <0.0031 0.0031 0.016 WWO-D-RIGGINS1922-PT 8/8/2007 0.020 0.019 0.0012 0.0062 WWO-D-RIGGINS1922-BED1 8/8/2007 <0.0012 <0.0012 0.0012 0.0062

11/3/10 Page 15 of 20 Table 4.5

### Table 4.5 Residential Treatment Results, Ohio - GAC System Samples Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

RESIDENT SAMPLE_NUMBER DATESMPL APFO (ug/L) PFOA (ug/L) *LOD (ug/L) *LOQ (ug/L)

WWO-D-RIGGINS1922-BED1 5/16/2007 <0.0027 <0.0027 0.0027 0.013 WWO-D-RIGGINS1922-BED1 2/19/2007 <0.0010 <0.0010 0.0010 0.0051 WWO-D-RIGGINS1922-BED1 8/21/2006 <0.0026 <0.0026 0.0026 0.013 WWO-D-RIGGINS1922-PT 6/28/2006 0.779 0.748 0.0026 0.013 WWO-D-RIGGINS1922-BED1 6/28/2006 <0.0026 <0.0026 0.0026 0.013 RumerJH WWO-D-RUMERJH-PT 8/24/2010 1.6 1.5 0.025 0.12 WWO-D-RUMERJH-BED1 8/24/2010 <0.0025 <0.0025 0.0025 0.012 WWO-D-RUMERJH-BED1 5/18/2010 <0.0038 <0.0038 0.0038 0.019 WWO-D-RUMERJH-BED1 3/2/2010 <0.0035 <0.0035 0.0035 0.018 WWO-D-RUMERJH-BED1 12/1/2009 <0.0021 <0.0021 0.0021 0.010 WWO-D-RUMERJH-PT 8/10/2009 1.8 1.7 0.026 0.13 WWO-D-RUMERJH-BED1 8/10/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-RUMERJH-BED1 5/8/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-RUMERJH-BED1 2/9/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-RUMERJH-BED1 11/11/2008 <0.0017 <0.0017 0.0017 0.0085 WWO-D-RUMERJH-PT 7/31/2008 0.65 0.62 0.0023 0.012 WWO-D-RUMERJH-BED1 7/31/2008 <0.0023 <0.0023 0.0023 0.012 WWO-D-RUMERJH-BED1 4/8/2008 <0.0019 <0.0019 0.0019 0.0096 WWO-D-RUMERJH-BED1 2/4/2008 <0.0022 <0.0022 0.0022 0.011 WWO-D-RUMERJH-BED1 11/1/2007 <0.0031 <0.0031 0.0031 0.016 WWO-D-RUMERJH-PT 7/25/2007 1.0 1.0 0.012 0.062 WWO-D-RUMERJH-BED1 7/25/2007 NQ NQ 0.0012 0.0062 WWO-D-RUMERJH-BED2 7/25/2007 NQ NQ 0.0012 0.0062 WWO-D-RUMERJH-BED1 5/9/2007 <0.0027 <0.0027 0.0027 0.013 WWO-D-RUMERJH-BED1 1/31/2007 <0.0010 <0.0010 0.0010 0.0051 WWO-D-RUMERJH-BED1 10/30/2006 <0.0018 <0.0018 0.0018 0.0090 WWO-D-RUMERJH-BED1 8/15/2006 <0.0026 <0.0026 0.0026 0.013 WWO-D-RUMERJH-PT 5/12/2006 1.06 1.02 0.012 0.06 WWO-D-RUMERJH-BED1 5/12/2006 <0.0012 <0.0012 0.0012 0.006 RyanSP WWO-D-RYANSP-PT 8/25/2010 0.28 0.27 0.0025 0.012 WWO-D-RYANSP-BED1 8/25/2010 <0.0025 <0.0025 0.0025 0.012 WWO-D-RYANSP-BED1 5/18/2010 NQ NQ 0.0038 0.019 WWO-D-RYANSP-BED2 5/18/2010 <0.0038 <0.0038 0.0038 0.019 WWO-D-RYANSP-BED1 3/2/2010 <0.0035 <0.0035 0.0035 0.018 WWO-D-RYANSP-BED1 12/1/2009 <0.0021 <0.0021 0.0021 0.010 WWO-D-RYANSP-PT 8/13/2009 0.31 0.30 0.0026 0.013 WWO-D-RYANSP-BED1 8/13/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-RYANSP-BED1 5/5/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-RYANSP-BED1 2/11/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-RYANSP-BED1 11/11/2008 <0.0017 <0.0017 0.0017 0.0085 WWO-D-RYANSP-PT 7/31/2008 0.16 0.15 0.0023 0.012 WWO-D-RYANSP-BED1 7/31/2008 <0.0023 <0.0023 0.0023 0.012 WWO-D-RYANSP-BED1 4/8/2008 <0.0019 <0.0019 0.0019 0.0096 WWO-D-RYANSP-BED1 2/4/2008 <0.0022 <0.0022 0.0022 0.011 WWO-D-RYANSP-BED1 10/31/2007 <0.0031 <0.0031 0.0031 0.016 WWO-D-RYANSP-PT 7/25/2007 0.20 0.19 0.0012 0.0062 WWO-D-RYANSP-BED1 7/25/2007 <0.0012 <0.0012 0.0012 0.0062 WWO-D-RYANSP-BED1 5/15/2007 <0.0027 <0.0027 0.0027 0.013 WWO-D-RYANSP-BED1 2/1/2007 <0.0010 <0.0010 0.0010 0.0051 WWO-D-RYANSP-BED1 11/2/2006 <0.0018 <0.0018 0.0018 0.0090 WWO-D-RYANSP-BED1 8/15/2006 <0.0026 <0.0026 0.0026 0.013 WWO-D-RYANSP-BED1-2 8/15/2006 <0.0026 <0.0026 0.0026 0.013

11/3/10 Page 16 of 20 Table 4.5

### Table 4.5 Residential Treatment Results, Ohio - GAC System Samples Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

RESIDENT SAMPLE_NUMBER DATESMPL APFO (ug/L) PFOA (ug/L) *LOD (ug/L) *LOQ (ug/L)

WWO-D-RYANSP-PT 5/15/2006 0.243 0.233 0.00098 0.0049 WWO-D-RYANSP-BED1 5/15/2006 <0.00098 <0.00098 0.00098 0.0049 SmithTJ WWO-D-SMITHTJ-PT 8/31/2010 0.076 0.073 0.0025 0.012 WWO-D-SMITHTJ-BED1 8/31/2010 <0.0025 <0.0025 0.0025 0.012 WWO-D-SMITHTJ-BED1 5/20/2010 <0.0038 <0.0038 0.0038 0.019 WWO-D-SMITHTJ-BED1 3/16/2010 <0.0035 <0.0035 0.0035 0.018 WWO-D-SMITHTJ-BED1 12/10/2009 <0.0021 <0.0021 0.0021 0.01 WWO-D-SMITHTJ-PT 9/1/2009 0.085 0.082 0.0026 0.013 WWO-D-SMITHTJ-BED1 9/1/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-SMITHTJ-BED1 6/9/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-SMITHTJ-BED1 3/4/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-SMITHTJ-BED1 12/11/2008 <0.0017 <0.0017 0.0017 0.0085 WWO-D-SMITHTJ-PT 9/10/2008 0.10 0.10 0.0023 0.012 WWO-D-SMITHTJ-BED1 9/10/2008 <0.0023 <0.0023 0.0023 0.012 WWO-D-SMITHTJ-BED1 6/17/2008 <0.0019 <0.0019 0.0019 0.0096 WWO-D-SMITHTJ-BED1 2/26/2008 NQ NQ 0.0022 0.011 WWO-D-SMITHTJ-BED2 2/26/2008 NQ NQ 0.0022 0.011 WWO-D-SMITHTJ 12/4/2007 <0.0031 <0.0031 0.0031 0.016 WWO-D-SMITHTJ 12/4/2007 <0.0031 <0.0031 0.0031 0.016 WWO-D-SMITHTJ-PT 8/15/2007 0.21 0.20 0.0012 0.0062 WWO-D-SMITHTJ-BED1 8/15/2007 <0.0012 <0.0012 0.0012 0.0062 WWO-D-SMITHTJ-BED1 5/30/2007 <0.0027 <0.0027 0.0027 0.013 WWO-D-SMITHTJ-BED1 2/23/2007 <0.0010 <0.0010 0.0010 0.0051 WWO-D-SMITHTJ-BED1 12/7/2006 <0.0018 <0.0018 0.0018 0.0090 WWO-D-SMITHTJ-BED1 8/16/2006 <0.0026 <0.0026 0.0026 0.013 WWO-D-SMITHTJ-PT 6/20/2006 0.258 0.248 0.0012 0.006 WWO-D-SMITHTJ-BED1 6/20/2006 NQ NQ 0.0012 0.006 WWO-D-SMITHTJ-BED2 6/20/2006 <0.0026 <0.0026 0.0026 0.013 ThornberryW WWO-D-THORNBERRYW-PT 8/18/2010 0.040 0.038 0.0025 0.012 WWO-D-THORNBERRYW-BED1 8/18/2010 <0.0025 <0.0025 0.0025 0.012 WWO-D-THORNBERRYW-BED1 5/18/2010 NQ NQ 0.0038 0.019 WWO-D-THORNBERRYW-BED2 5/18/2010 <0.0038 <0.0038 0.0038 0.019 WWO-D-THORNBERRYW-BED1 3/2/2010 <0.0035 <0.0035 0.0035 0.018 WWO-D-THORNBERRYW-BED1 12/1/2009 <0.0021 <0.0021 0.0021 0.010 WWO-D-THORNBERRYW-PT 7/29/2009 0.047 0.045 0.0026 0.013 WWO-D-THORNBERRYW-BED1 7/29/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-THORNBERRYW-BED1 5/7/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-THORNBERRYW-BED1 2/10/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-THORNBERRYW-BED1 11/11/2008 <0.0017 <0.0017 0.0017 0.0085 WWO-D-THORNBERRYW-PT 8/12/2008 0.10 0.097 0.0023 0.012 WWO-D-THORNBERRYW-BED1 8/12/2008 <0.0023 <0.0023 0.0023 0.012 WWO-D-THORNBERRYW-BED1 4/8/2008 <0.0019 <0.0019 0.0019 0.0096 WWO-D-THORNBERRYW-BED1 2/5/2008 <0.0022 <0.0022 0.0022 0.011 WWO-D-THORNBERRYW-BED1 11/14/2007 <0.0031 <0.0031 0.0031 0.016 WWO-D-THORNBERRYW-PT 7/27/2007 0.12 0.12 0.0012 0.0062 WWO-D-THORNBERRYW-BED1 7/27/2007 <0.0012 <0.0012 0.0012 0.0062 WWO-D-THORNBERRYW-BED1 5/16/2007 <0.0027 <0.0027 0.0027 0.013 WWO-D-THORNBERRYW-BED1 2/20/2007 <0.0010 <0.0010 0.0010 0.0051 WWO-D-THORNBERRYW-BED1 12/7/2006 <0.0018 <0.0018 0.0018 0.0090 WWO-D-THORNBERRYW-PT 8/24/2006 0.041 0.039 0.0026 0.013 WWO-D-THORNBERRYW-BED1 8/24/2006 <0.0026 <0.0026 0.0026 0.013 WebbOL$ WWO-D-WEBBOL-BED1 6/24/2010 NQ NQ 0.0038 0.019

11/3/10 Page 17 of 20 Table 4.5

### Table 4.5 Residential Treatment Results, Ohio - GAC System Samples Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

RESIDENT SAMPLE_NUMBER DATESMPL APFO (ug/L) PFOA (ug/L) *LOD (ug/L) *LOQ (ug/L) WWO-D-WEBBOL-BED2 6/24/2010 NQ NQ 0.0025 0.012 WWO-D-WEBBOL-BED1 11/2/2009 <0.0033 <0.0033 0.0033 0.016 WWO-D-WEBBOL-PT 8/13/2009 0.20 0.19 0.0026 0.013 WWO-D-WEBBOL-BED1 8/13/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-WEBBOL-BED1 6/11/2009 NQ NQ 0.0026 0.013 WWO-D-WEBBOL-BED2 6/11/2009 NQ NQ 0.0026 0.013 WWO-D-WEBBOL-PT 8/7/2008 0.18 0.17 0.0023 0.012 WWO-D-WEBBOL-BED1 8/7/2008 <0.0023 <0.0023 0.0023 0.012 WWO-D-WEBBOL-BED1 6/5/2008 0.012 0.012 0.0019 0.0096 WWO-D-WEBBOL-BED2 6/5/2008 NQ NQ 0.0019 0.0096 WWO-D-WEBBOL-PT 8/30/2007 0.11 0.11 0.0012 0.0062 WWO-D-WEBBOL-BED1 8/30/2007 0.0070 0.0067 0.0012 0.0062 WWO-D-WEBBOL-BED2 8/30/2007 <0.0012 <0.0012 0.0012 0.0062 WWO-D-WEBBOL-PT 7/24/2007 0.19 0.18 0.0012 0.0062 WWO-D-WEBBOL-BED1 7/24/2007 NQ NQ 0.0012 0.0062 WWO-D-WEBBOL-BED2 7/24/2007 0.17 0.16 0.0012 0.0062 WWO-D-WEBBOL-BED1 5/15/2007 <0.0027 <0.0027 0.0027 0.013 WWO-D-WEBBOL-BED1 10/24/2006 <0.0018 <0.0018 0.0018 0.0090 WWO-D-WEBBOL-BED1 8/15/2006 <0.0026 <0.0026 0.0026 0.013 WWO-D-WEBBOL-PT 6/14/2006 0.199 0.191 0.0012 0.006 WWO-D-WEBBOL-BED1 6/14/2006 <0.0012 <0.0012 0.0012 0.006 WeiglyG~ WWO-D-WEIGLYG-BED1 5/17/2007 <0.0027 <0.0027 0.0027 0.013 WWO-D-WEIGLYG-BED1 3/7/2007 <0.0010 <0.0010 0.0010 0.0051 WWO-D-WEIGLYG-BED1 11/16/2006 <0.0018 <0.0018 0.0018 0.0090 WWO-D-WEIGLYG-PT 10/4/2006 0.23 0.22 0.0018 0.0090 WWO-D-WEIGLYG-BED1 10/4/2006 <0.0018 <0.0018 0.0018 0.0090 Wheaton2610 WWO-D-WHEATON2610-PT 8/18/2010 0.055 0.053 0.0025 0.012 WWO-D-WHEATON2610-BED1 8/18/2010 <0.0025 <0.0025 0.0025 0.012 WWO-D-WHEATON2610-BED1 5/17/2010 <0.0038 <0.0038 0.0038 0.019 WWO-D-WHEATON2610-BED1 3/2/2010 <0.0035 <0.0035 0.0035 0.018 WWO-D-WHEATON2610-BED1 12/1/2009 <0.0021 <0.0021 0.0021 0.010 WWO-D-WHEATON2610-PT 7/29/2009 0.060 0.058 0.0026 0.013 WWO-D-WHEATON2610-BED1 7/29/2009 NQ NQ 0.0026 0.013 WWO-D-WHEATON2610-BED2 7/29/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-WHEATON2610-BED1 5/5/2009 NQ NQ 0.0026 0.013 WWO-D-WHEATON2610-BED2 5/5/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-WHEATON2610-BED1 2/9/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-WHEATON2610-BED1 11/11/2008 NQ NQ 0.0017 0.0085 WWO-D-WHEATON2610-BED2 11/11/2008 NQ NQ 0.0017 0.0085 WWO-D-WHEATON2610-PT 7/31/2008 0.028 0.027 0.0023 0.012 WWO-D-WHEATON2610-BED1 7/31/2008 <0.0023 <0.0023 0.0023 0.012 WWO-D-WHEATON2610-BED1 4/8/2008 <0.0019 <0.0019 0.0019 0.0096 WWO-D-WHEATON2610-BED1 2/4/2008 <0.0022 <0.0022 0.0022 0.011 WWO-D-WHEATON2610-BED1 11/1/2007 <0.0031 <0.0031 0.0031 0.016 WWO-D-WHEATON2610-PT 7/25/2007 0.042 0.040 0.0012 0.0062 WWO-D-WHEATON2610-BED1 7/25/2007 NQ NQ 0.0012 0.0062 WWO-D-WHEATON2610-BED2 7/25/2007 NQ NQ 0.0012 0.0062 WWO-D-WHEATON2610-BED1 5/9/2007 <0.0027 <0.0027 0.0027 0.013 WWO-D-WHEATON2610-BED1 2/1/2007 <0.0010 <0.0010 0.0010 0.0051 WWO-D-WHEATON2610-BED1 11/2/2006 NQ NQ 0.0018 0.0090 WWO-D-WHEATON2610-BED2 11/2/2006 <0.0018 <0.0018 0.0018 0.0090 WWO-D-WHEATON2610-BED1 8/17/2006 <0.0026 <0.0026 0.0026 0.013

11/3/10 Page 18 of 20 Table 4.5

### Table 4.5 Residential Treatment Results, Ohio - GAC System Samples Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

RESIDENT SAMPLE_NUMBER DATESMPL APFO (ug/L) PFOA (ug/L) *LOD (ug/L) *LOQ (ug/L)

WWO-D-WHEATONCA-PT 5/16/2006 0.0474 0.0455 0.0012 0.006 WWO-D-WHEATONCA-BED1 5/16/2006 <0.0012 <0.0012 0.0012 0.006 WhiteheadE WWO-D-WHITEHEADE-PT 8/31/2010 0.22 0.21 0.0025 0.012 WWO-D-WHITEHEADE-BED1 8/31/2010 <0.0025 <0.0025 0.0025 0.012 WWO-D-WHITEHEADE-BED1 5/20/2010 <0.0038 <0.0038 0.0038 0.019 WWO-D-WHITEHEADE-BED1 3/16/2010 <0.0035 <0.0035 0.0035 0.018 WWO-D-WHITEHEADE-BED1 12/10/2009 <0.0021 <0.0021 0.0021 0.01 WWO-D-WHITEHEADE-PT 9/1/2009 0.23 0.22 0.0026 0.013 WWO-D-WHITEHEADE-BED1 9/1/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-WHITEHEADE-BED1 6/10/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-WHITEHEADE-BED1 3/4/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-WHITEHEADE-BED1 12/11/2008 <0.0017 <0.0017 0.0017 0.0085 WWO-D-WHITEHEADE-PT 9/23/2008 0.27 0.26 0.0017 0.0085 WWO-D-WHITEHEADE-BED1 9/23/2008 <0.0017 <0.0017 0.0017 0.0085 WWO-D-WHITEHEADE-BED1 5/28/2008 <0.0019 <0.0019 0.0019 0.0096 WWO-D-WHITEHEADE-BED1 2/26/2008 <0.0022 <0.0022 0.0022 0.011 WWO-D-WHITEHEADE-BED1 12/15/2007 <0.0031 <0.0031 0.0031 0.016 WWO-D-WHITEHEADE-PT 8/15/2007 0.37 0.36 0.0012 0.0062 WWO-D-WHITEHEADE-BED1 8/15/2007 <0.0012 <0.0012 0.0012 0.0062 WWO-D-WHITEHEADE-BED1 5/30/2007 <0.0027 <0.0027 0.0027 0.013 WWO-D-WHITEHEADE-BED1 2/22/2007 <0.0010 <0.0010 0.0010 0.0051 WWO-D-WHITEHEADE-BED1 12/7/2006 <0.0018 <0.0018 0.0018 0.0090 WWO-D-WHITEHEADE-BED1 8/16/2006 <0.0026 <0.0026 0.0026 0.013 WWO-D-WHITEHEADE-PT 6/20/2006 0.476 0.457 0.0012 0.006 WWO-D-WHITEHEADE-BED1 6/20/2006 <0.0012 <0.0012 0.0012 0.006 WilsonRM1 WWO-D-WILSONRM1-PT 8/18/2010 4.9 4.7 0.025 0.12 WWO-D-WILSONRM1-BED1 8/18/2010 NQ NQ 0.0025 0.012 WWO-D-WILSONRM1-BED2 8/18/2010 NQ NQ 0.0025 0.012 WWO-D-WILSONRM1-BED1 5/17/2010 <0.0038 <0.0038 0.0038 0.019 WWO-D-WILSONRM1-BED1 3/2/2010 NQ NQ 0.0035 0.018 WWO-D-WILSONRM1-BED2 3/2/2010 <0.0035 <0.0035 0.0035 0.018 WWO-D-WILSONRM1-BED1 12/1/2009 <0.0021 <0.0021 0.0021 0.010 WWO-D-WILSONRM1-PT 7/29/2009 4.7 4.5 0.026 0.13 WWO-D-WILSONRM1-BED1 7/29/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-WILSONRM1-BED1 5/5/2009 NQ NQ 0.0026 0.013 WWO-D-WILSONRM1-BED2 5/5/2009 2.0 1.9 0.026 0.13 WWO-D-WILSONRM1-BED1 2/9/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-WILSONRM1-BED1 11/11/2008 NQ NQ 0.0017 0.0085 WWO-D-WILSONRM1-BED2 11/11/2008 NQ NQ 0.0017 0.0085 WWO-D-WILSONRM1-PT 8/12/2008 3.4 3.3 0.023 0.12 WWO-D-WILSONRM1-BED1 8/12/2008 <0.0023 <0.0023 0.0023 0.012 WWO-D-WILSONRM1-BED1 4/8/2008 NQ NQ 0.0019 0.0096 WWO-D-WILSONRM1-BED2 4/8/2008 NQ NQ 0.0019 0.0096 WWO-D-WILSONRM1-BED1 2/5/2008 NQ NQ 0.0022 0.011 WWO-D-WILSONRM1-BED2 2/5/2008 NQ NQ 0.0022 0.011 WWO-D-WILSONRM1-BED1 11/1/2007 <0.0031 <0.0031 0.0031 0.016 WWO-D-WILSONRM1-BED1-2 11/1/2007 <0.0031 <0.0031 0.0031 0.016 WWO-D-WILSONRM1-PT 7/27/2007 3.7 3.6 0.012 0.062 WWO-D-WILSONRM1-BED1 7/27/2007 NQ NQ 0.0012 0.0062 WWO-D-WILSONRM1-BED2 7/27/2007 NQ NQ 0.0012 0.0062 WWO-D-WILSONRM1-BED1 5/15/2007 NQ NQ 0.0027 0.013 WWO-D-WILSONRM1-BED2 5/15/2007 <0.0027 <0.0027 0.0027 0.013

11/3/10 Page 19 of 20 Table 4.5

### Table 4.5 Residential Treatment Results, Ohio - GAC System Samples Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

RESIDENT SAMPLE_NUMBER DATESMPL APFO (ug/L) PFOA (ug/L) *LOD (ug/L) *LOQ (ug/L)

WWO-D-WILSONRM1-BED1 2/1/2007 <0.0010 <0.0010 0.0010 0.0051 WWO-D-WILSONRM1-BED1 11/2/2006 <0.0018 <0.0018 0.0018 0.0090 WWO-D-WILSONRM1-BED1 8/15/2006 <0.0026 <0.0026 0.0026 0.013 WWO-D-WILSONRM1-PT 6/28/2006 3.29 3.16 0.026 0.13 WWO-D-WILSONRM1-PT-2 6/28/2006 3.26 3.13 0.026 0.13 WWO-D-WILSONRM1-BED1 6/28/2006 <0.0026 <0.0026 0.0026 0.013

#Sample nomenclature may not be consistent over time. However, all samples have been checked to verify that they are from the same location. *Starting in July 2005, Limit of Detection (LOD) and Limit of Quantitiation (LOQ) were determined on at least a quarterly basis using the signal to noise determination described in the Phase II QAPP. NQ = Not quantifiable. Detected at a concentration above the LOD and below the LOQ. ^Well was winterized and no samples are taken during the winter months. In August 2007, the property was sold and th e residents will reside there year round. @ This resident passed away in late September 2007. ~GAC Treatment System was bypassed starting in 3Q07 by the resident due to bacteria issues with the well and therefo samples were collected. $Well is winterized and no samples are taken during the winter months.

11/3/10 Page 20 of 20 Table 4.5

### Table 4.6 Status of Residents Qualified for GAC Treatment Receiving Alternative Treatment or Not Being Sampled Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

RESIDENT SAMPLE_NUMBER DATESMPL APFO (ppb or ug/L) *PFOA (ppb or ug/L) **LOD (ppb or ug/L) **LOQ (ppb or ug/L) Comments

2727BeachDr WWO-D-2727BEACHDR-BED1 11/1/2007 <0.0031 <0.0031 0.0031 0.016

WWO-D-2727BEACHDR-PT 7/25/2007 0.27 0.26 0.0012 0.0062

WWO-D-2727BEACHDR-BED1 7/25/2007 <0.0012 <0.0012 0.0012 0.0062 WWO-D-2727BEACHDRIVE-BED1 5/24/2007 <0.0027 <0.0027 0.0027 0.013 WWO-D-KEMPN-BED1 3/1/2007 <0.0010 <0.0010 0.0010 0.0051 WWO-D-KEMPN-BED1 12/19/2006 <0.0018 <0.0018 0.0018 0.0090 WWO-D-KEMPN-BED1 8/17/2006 <0.0026 <0.0026 0.0026 0.013 WWO-D-KEMPN-PT 6/15/2006 0.222 0.213 0.0012 0.006 WWO-D-KEMPN-BED1 6/15/2006 <0.0012 <0.0012 0.0012 0.006 WWO-D-KEMP N 9/11/2002 0.0912 0.01 0.05 3015StRt339 WWO-D-3015STRT339-PT 8/2/2007 2.5 2.4 0.012 0.062 WWO-D-3015STRT339-BED1 8/2/2007 <0.0012 <0.0012 0.0012 0.0062 WWO-D-3015STRT339-BED1 5/29/2007 <0.0027 <0.0027 0.0027 0.013 WWO-D-WATSONK-BED1 2/1/2007 <0.0010 <0.0010 0.0010 0.0051 WWO-D-WATSONK-BED1 11/2/2006 <0.0018 <0.0018 0.0018 0.0090 WWO-D-WATSONK-BED1 8/17/2006 <0.0026 <0.0026 0.0026 0.013 WWO-D-WATSONK-PT 6/20/2006 2.16 2.07 0.012 0.06 WWO-D-WATSONK-BED1 6/20/2006 <0.0012 <0.0012 0.0012 0.006

WWO-D-16783 11/17/2005 3.11 2.99 0.043 0.22 AnkromS WWO-D-ANKROMS-BED1 2/12/2008 <0.0022 <0.0022 0.0022 0.011 WWO-D-ANKROMS-BED1 11/19/2007 <0.0031 <0.0031 0.0031 0.016 WWO-D-ANKROMS-PT 8/3/2007 0.69 0.66 0.0012 0.0062 WWO-D-ANKROMS-BED1 8/3/2007 <0.0012 <0.0012 0.0012 0.0062 WWO-D-ANKROMS-BED1 5/24/2007 <0.0027 <0.0027 0.0027 0.013 WWO-D-ANKROMS-BED1 2/16/2007 <0.0010 <0.0010 0.0010 0.0051 WWO-D-ANKROMS-BED1-2 2/16/2007 <0.0010 <0.0010 0.0010 0.0051 WWO-D-ANKROMS-BED1 12/6/2006 <0.0018 <0.0018 0.0018 0.0090 WWO-D-ANKROMS-PT 8/21/2006 0.45 0.43 0.0026 0.013 WWO-D-ANKROMS-BED1 8/21/2006 <0.0026 <0.0026 0.0026 0.013 WWO-D-12375 12/8/2005 0.637 0.612 0.002 0.0098 BaileyR WWO-D-11641 12/22/2004 0.0526 0.0505 0.01 0.05 Bacterial issued never resolved by owner. Owner connected to PWS in 2Q07 and connection reimbursed by DuPont in 1Q08.

BakerH WWK-D-BAKERH-BED1 3/15/2010 <0.0035 <0.0035 0.0035 0.018 WWK-D-BAKERH-BED1 12/16/2009 <0.0033 <0.0033 0.0033 0.016 WWK-D-BAKERH-PT 9/14/2009 0.33 0.32 0.0026 0.013 WWK-D-BAKERH-BED1 9/14/2009 <0.0026 <0.0026 0.0026 0.013 WWK-D-BAKERH-BED1 3/17/2009 <0.0026 <0.0026 0.0026 0.013 WWK-D-BAKERH-BED1 11/24/2008 <0.0017 <0.0017 0.0017 0.0085 WWK-D-BAKERH-PT 9/3/2008 0.31 0.30 0.0023 0.012 WWK-D-BAKERH-BED1 9/3/2008 <0.0023 <0.0023 0.0023 0.012 WWK-D-BAKERH-BED1 6/23/2008 <0.0023 <0.0023 0.0023 0.012 WWK-D-BAKERH-BED1 3/21/2008 <0.0019 <0.0019 0.0019 0.0096 WWK-D-BAKERH-BED1 12/15/2007 <0.0031 <0.0031 0.0031 0.016 WWK-D-BAKERH-PT 8/20/2007 0.25 0.24 0.0012 0.0062 WWK-D-BAKERH-BED1 8/20/2007 <0.0012 <0.0012 0.0012 0.0062 WWK-D-BAKERH-BED1 6/12/2007 <0.0027 <0.0027 0.0027 0.013 WWK-D-BAKERH-BED1 3/1/2007 <0.0010 <0.0010 0.0010 0.0051 WWK-D-BAKERH-BED1 10/31/2006 <0.0018 <0.0018 0.0018 0.0090 WWK-D-BAKERH-BED1 8/9/2006 <0.0016 <0.0016 0.0016 0.0078 WWK-D-BAKERH-PT 6/29/2006 0.315 0.303 0.0026 0.013 WWK-D-BAKERH-BED1 6/29/2006 <0.0026 <0.0026 0.0026 0.013

WWK-D-BAKER H 12/14/2001 0.339 0.01 0.05 DRL-D-BAKERH 6/23/2004 0.377 0.01 0.05 DRL-D-BAKER H 9/15/2004 0.558 0.01 0.05 DRL-D-BAKER H-DUP 9/15/2004 0.605 0.01 0.05 DRL-D-BAKER H 12/2/2004 0.677 0.65 0.01 0.05 DRL-D-BAKER H-DUP 12/2/2004 0.721 0.693 0.01 0.05 DRL-D-BAKER H 1/21/2005 0.287 0.276 0.01 0.05 DRL-D-BAKER H 4/22/2005 0.346 0.333 0.01 0.05 DRL-D-BAKER H 7/12/2005 0.289 0.278 0.0015 0.0073 DRL-D-BAKER H 10 / 14 /2005 0.462 0.444 0.0022 0.011 Harold Baker passed away and his wife has moved to nursing home, property ownership was transferred to the grandson, Derek McCrady, who now resides in the house and had house connected to Lubeck PSD during 2Q10. Connection costs will be reimbursed and GAC treatment system will be removed as soon as possible. Resident had a trailer on rental property. Property sold and the trailer was moved to another location. Gac treatment system was removed in early July 2008. Watson was original owner of property. Property sold to Lewis during 2Q07. Lewis requested connection to LHWA in 4Q07. Residence was connected to LHWA in 1Q08 and the residential GAC system was removed. Kemp was original owner of property. Property sold to Kincaid during 1Q07. Last sampling event was 4Q07. Property was purchased by the Gotshalls during 3Q08 (2725BeachDr, See Table 4.8) and was winterized. October 2008 tanks removed and system will have O&M if system is utilized in the future.



### 11/3/10 Page 1 of 4 Table 4.6

### Table 4.6 Status of Residents Qualified for GAC Treatment Receiving Alternative Treatment or Not Being Sampled Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

RESIDENT SAMPLE_NUMBER DATESMPL APFO (ppb or ug/L) *PFOA (ppb or ug/L) **LOD (ppb or ug/L) **LOQ (ppb or ug/L) Comments

BoardJG WWO-D-BOARDJG-BED1 11/19/2007 <0.0031 <0.0031 0.0031 0.016

WWO-D-BOARDJG-PT 8/9/2007 8.4 8.1 0.012 0.062 WWO-D-BOARDJG-BED1 8/9/2007 <0.0012 <0.0012 0.0012 0.0062 WWO-D-BOARDJG-BED1 5/16/2007 <0.0027 <0.0027 0.0027 0.013 WWO-D-BOARDJG-BED1 2/12/2007 <0.0010 <0.0010 0.0010 0.0051 WWO-D-BOARDJG-BED1 12/6/2006 <0.0018 <0.0018 0.0018 0.0090 WWO-D-BOARDJG-BED1 8/8/2006 <0.0016 <0.0016 0.0016 0.0078 WWO-D-BOARDJG-PT 5/15/2006 13.5 13 0.098 0.49 WWO-D-BOARDJG-BED1 5/15/2006 <0.00098 <0.00098 0.00098 0.0049 WWO-D-BOARD JG 8/6/2002 6.5 0.01 0.05 CoggeshallJL WWO-D-COGGESHALLJL-BED1 11/27/2007 <0.0031 <0.0031 0.0031 0.016

WWO-D-COGGESHALLJL-PT 8/9/2007 3.1 3.0 0.012 0.062 WWO-D-COGGESHALLJL-BED1 8/9/2007 <0.0012 <0.0012 0.0012 0.0062

WWO-D-COGGESHALLJL-BED1 5/29/2007 <0.0027 <0.0027 0.0027 0.013

WWO-D-COGGESHALLJL-BED1 2/19/2007 <0.0010 <0.0010 0.0010 0.0051

WWO-D-COGGESHALLJL-BED1 12/12/2006 <0.0018 <0.0018 0.0018 0.0090

WWO-D-COGGESHALLJL-BED1 8/17/2006 <0.0026 <0.0026 0.0026 0.013

WWO-D-COGGESHALLJL-PT 5/11/2006 3.73 3.59 0.012 0.06 WWO-D-COGGESHALLJL-BED1 5/11/2006 <0.0012 <0.0012 0.0012 0.006

WWO-D-1008970 10/3/2005 4.02 3.86 0.014 0.067 HunterPR WWO-D-HUNTERPR-BED1 4/8/2008 <0.0019 <0.0019 0.0019 0.0096 WWO-D-HUNTERPR-BED1 2/6/2008 <0.0022 <0.0022 0.0022 0.011 WWO-D-HUNTERPR-BED1 11/15/2007 <0.0031 <0.0031 0.0031 0.016 WWO-D-HUNTERPR-PT 8/1/2007 0.54 0.52 0.0012 0.0062 WWO-D-HUNTERPR-BED1 8/1/2007 <0.0012 <0.0012 0.0012 0.0062 WWO-D-HUNTERPR-BED1 5/18/2007 <0.0027 <0.0027 0.0027 0.013 WWO-D-HUNTERPR-BED1 2/1/2007 <0.0010 <0.0010 0.0010 0.0051 WWO-D-HUNTERPR-BED1 11/2/2006 <0.0018 <0.0018 0.0018 0.0090 WWO-D-HUNTERPR-PT 8/15/2006 0.47 0.45 0.0026 0.013 WWO-D-HUNTERPR-BED1 8/15/2006 <0.0026 <0.0026 0.0026 0.013 WWO-D-16813 1/11/2006 0.346 0.332 0.0012 0.0062 LittleJM WWO-D-LITTLEJM-BED1 2/14/2008 NQ NQ 0.0022 0.011 WWO-D-LITTLEJM-BED2 2/14/2008 NQ NQ 0.0022 0.011 WWO-D-LITTLEJM-BED1 11/20/2007 NQ NQ 0.0031 0.016 WWO-D-LITTLEJM-BED2 11/20/2007 NQ NQ 0.0031 0.016 WWO-D-LITTLEJM-PT 8/9/2007 2.2 2.1 0.012 0.062 WWO-D-LITTLEJM-BED1 8/9/2007 NQ NQ 0.0012 0.0062 WWO-D-LITTLEJM-BED2 8/9/2007 NQ NQ 0.0012 0.0062 WWO-D-LITTLEJM-BED1 5/16/2007 NQ NQ 0.0027 0.013 WWO-D-LITTLEJM-BED1-2 5/16/2007 <0.0027 <0.0027 0.0027 0.013 WWO-D-LITTLEJM-BED2 5/16/2007 <0.0027 <0.0027 0.0027 0.013 WWO-D-LITTLEJM-BED1 2/16/2007 NQ NQ 0.0010 0.0051 WWO-D-LITTLEJM-BED2 2/16/2007 <0.0010 <0.0010 0.0010 0.0051 WWO-D-LITTLEJR-BED1 12/11/2006 NQ NQ 0.0018 0.0090 WWO-D-LITTLEJR-BED2 12/11/2006 <0.0018 <0.0018 0.0018 0.0090 WWO-D-LITTLEJM-BED1 8/17/2006 <0.0026 <0.0026 0.0026 0.013 WWO-D-LITTLEJM-PT 5/15/2006 3.44 3.3 0.0098 0.049 WWO-D-LITTLEJM-BED1 5/15/2006 <0.00098 <0.00098 0.00098 0.0049 WWO-D-LITTLE JM 7/9/2002 2.13 0.01 0.05 LippsLL WWO-D-LIPPSLL-BED1 6/19/2008 <0.0019 <0.0019 0.0019 0.0096 WWO-D-LIPPSLL-BED1 2/12/2008 <0.0022 <0.0022 0.0022 0.011 WWO-D-LIPPSLL-BED1 11/20/2007 <0.0031 <0.0031 0.0031 0.016 WWO-D-LIPPSLL-PT 8/8/2007 0.51 0.49 0.0012 0.0062 WWO-D-LIPPSLL-BED1 8/8/2007 <0.0012 <0.0012 0.0012 0.0062 WWO-D-LIPPSLL-BED1 5/24/2007 <0.0027 <0.0027 0.0027 0.013 WWO-D-LIPPSLL-BED1 2/13/2007 <0.0010 <0.0010 0.0010 0.0051 WWO-D-LIPPSLL-BED1 12/6/2006 <0.0018 <0.0018 0.0018 0.0090 WWO-D-LIPPSLL-BED1 8/8/2006 <0.0016 <0.0016 0.0016 0.0078 WWO-D-LIPPSLL-PT 5/17/2006 0.602 0.578 0.0012 0.006 WWO-D-LIPPSLL-BED1 5/17/2006 <0.0012 <0.0012 0.0012 0.006 WWO-D-16755 10/3/2005 0.788 0.757 0.0028 0.013

MaceMD WWO-D-MACEMD-PT 9/27/2008 0.64 0.61 0.0017 0.0085 WWO-D-MACEMD-BED1 9/27/2008 <0.0017 <0.0017 0.0017 0.0085 WWO-D-MACEMD-BED1 6/5/2008 <0.0019 <0.0019 0.0019 0.0096 WWO-D-MACEMD-BED1 2/26/2008 <0.0022 <0.0022 0.0022 0.011 WW O -D-MA C EMD-BED1 11 /20 /2007 <0.0031 <0.0031 0.0031 0.016 In 1Q08 DuPont learned that this residence was connected to LHWA. DuPont removed the GAC treatment system on 7/25/08 and reimbursed the resident for his connection fees. In 1Q08, DuPont learned that this residence was connected to LHWA. DuPont removed the GAC treatment system on 7/25/08 and reimbursed the resident for his connection fees.

Residence was connected to LHWA in September 2008 and the residential GAC system was removed. Residence was connected to LHWA on September 17, 2008 and the residential GAC system was removed.

Residence was connected to LHWA on September 15, 2008 and the residential GAC system was removed.

Residence was connected to LHWA on October 16, 2008 and the residential GAC system was removed.



### 11/3/10 Page 2 of 4 Table 4.6

### Table 4.6 Status of Residents Qualified for GAC Treatment Receiving Alternative Treatment or Not Being Sampled Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

RESIDENT SAMPLE_NUMBER DATESMPL APFO (ppb or ug/L) *PFOA (ppb or ug/L) **LOD (ppb or ug/L) **LOQ (ppb or ug/L) Comments

WWO-D-MACEMD-PT 8/8/2007 0.54 0.52 0.0012 0.0062 WWO-D-MACEMD-BED1 8/8/2007 <0.0012 <0.0012 0.0012 0.0062 WWO-D-MACEMD-BED1 5/25/2007 <0.0027 <0.0027 0.0027 0.013 WWO-D-MACEMD-BED1 2/16/2007 <0.0010 <0.0010 0.0010 0.0051 WWO-D-MACEMD-BED1 12/6/2006 <0.0018 <0.0018 0.0018 0.0090 WWO-D-MACEMD-BED1 8/24/2006 <0.0026 <0.0026 0.0026 0.013 WWO-D-MACEMD-BED1-2 8/24/2006 <0.0026 <0.0026 0.0026 0.013 WWO-D-MACEMD-PT 6/19/2006 0.494 0.474 0.0012 0.006 WWO-D-MACEMD-BED1 6/19/2006 NQ NQ 0.0012 0.006 WWO-D-MACEMD-BED2 6/19/2006 <0.0026 <0.0026 0.0026 0.013 WWO-D-16691 3/4/2005 0.582 0.559 0.01 0.05

MooreT WWO-D-MOORET-BED1 6/18/2009 <0.0026 <0.0026 0.0026 0.013

WWO-D-MOORET-BED1 2/9/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-MOORET-BED1 11/26/2008 <0.0017 <0.0017 0.0017 0.0085 WWO-D-MOORET-PT 9/9/2008 0.64 0.61 0.0023 0.012 WWO-D-MOORET-BED1 9/9/2008 <0.0023 <0.0023 0.0023 0.012 WWO-D-MOORET-BED1 4/8/2008 <0.0019 <0.0019 0.0019 0.0096 WWO-D-MOORET-BED1 2/6/2008 <0.0022 <0.0022 0.0022 0.011 WWO-D-MOORET-BED1 11/15/2007 <0.0031 <0.0031 0.0031 0.016 WWO-D-MOORET-PT 8/2/2007 0.73 0.7 0.0012 0.0062 WWO-D-MOORET-BED1 8/2/2007 <0.0012 <0.0012 0.0012 0.0062 WWO-D-MOORET-BED1 5/15/2007 <0.0027 <0.0027 0.0027 0.013 WWO-D-MOORET-BED1 2/1/2007 <0.0010 <0.0010 0.001 0.0051 WWO-D-MOORET-BED1 11/2/2006 <0.0018 <0.0018 0.0018 0.009 WWO-D-MOORET-BED1 8/15/2006 <0.0026 <0.0026 0.0026 0.013 WWO-D-MOORET-PT 5/18/2006 0.601 0.578 0.0012 0.006 WWO-D-MOORET-BED1 5/18/2006 <0.0012 <0.0012 0.0012 0.006 WWO-D-16754 10/3/2005 0.704 0.676 0.0028 0.0134

NullWH WWO-D-NULLWH-PT 7/31/2008 1.5 1.4 0.023 0.12 WWO-D-NULLWH-BED1 7/31/2008 <0.0023 <0.0023 0.0023 0.012 WWO-D-NULLWH-BED1 6/23/2008 <0.0019 <0.0019 0.0019 0.0096 WWO-D-NULLWH-BED1 2/13/2008 <0.0022 <0.0022 0.0022 0.011 WWO-D-NULLWH-BED1 12/15/2007 <0.0031 <0.0031 0.0031 0.016 WWO-D-NULLWH-BED1-2 12/15/2007 <0.0031 <0.0031 0.0031 0.016 WWO-D-NULLWH-PT 8/16/2007 1.0 0.98 0.0012 0.0062 WWO-D-NULLWH-BED1 8/16/2007 <0.0012 <0.0012 0.0012 0.0062 WWO-D-NULLWH-BED1 6/1/2007 <0.0027 <0.0027 0.0027 0.013 WWO-D-NULLWH-BED1-2 6/1/2007 <0.0027 <0.0027 0.0027 0.013 WWO-D-NULL-BED1 2/19/2007 <0.0010 <0.0010 0.0010 0.0051 WWO-D-NULLWH-BED1 12/19/2006 <0.0018 <0.0018 0.0018 0.0090 WWO-D-NULLWH-BED1 8/21/2006 <0.0026 <0.0026 0.0026 0.013 WWO-D-NULLWH-PT 5/17/2006 1.21 1.16 0.012 0.06 WWO-D-NULLWH-BED1 5/17/2006 <0.0012 <0.0012 0.0012 0.006 WWO-D-1008939 10/3/2005 1.83 1.76 0.014 0.067 SwainPH WWO-D-SWAINPH-BED1 12/8/2009 <0.0033 <0.0033 0.0033 0.016 WWO-D-SWAINPH-PT 8/13/2009 0.71 0.68 0.0026 0.013 WWO-D-SWAINPH-BED1 8/13/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-SWAINPH-BED1 5/7/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-SWAINPH-BED1 2/11/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-SWAINPH-BED1 11/11/2008 <0.0017 <0.0017 0.0017 0.0085 WWO-D-SWAINPH-PT 7/31/2008 0.32 0.31 0.0023 0.012 WWO-D-SWAINPH-BED1 7/31/2008 <0.0023 <0.0023 0.0023 0.012 WWO-D-SWAINPH-BED1 4/8/2008 <0.0019 <0.0019 0.0019 0.0096 WWO-D-SWAINPH-BED1 2/5/2008 <0.0022 <0.0022 0.0022 0.011 WWO-D-SWAINPH-BED1 11/1/2007 <0.0031 <0.0031 0.0031 0.016 WWO-D-SWAINPH-PT 7/27/2007 0.68 0.65 0.0012 0.0062 WWO-D-SWAINPH-BED1 7/27/2007 <0.0012 <0.0012 0.0012 0.0062 WWO-D-SWAINPH-BED1 5/9/2007 <0.0027 <0.0027 0.0027 0.013 WWO-D-SWAINPH-BED1-2 5/9/2007 <0.0027 <0.0027 0.0027 0.013 WWO-D-SWAINPH-BED1 1/31/2007 <0.0010 <0.0010 0.001 0.0051 WWO-D-SWAINPH-BED1 11/2/2006 <0.0018 <0.0018 0.0018 0.009 WWO-D-SWAINPH-BED1 8/15/2006 <0.0026 <0.0026 0.0026 0.013 WWO-D-SWAINPH-PT 5/15/2006 0.832 0.799 0.00098 0.0049

WWO-D-SWAINPH-BED1 5/15/2006 <0.00098 <0.00098 0.00098 0.0049 WWK-D- S WAIN PH 3 /21 /2002 0.203 0.01 0.05 Residence was connected to LHWA on October 13, 2008 and the residential GAC system was removed.

Residence was connected to LHWA in February 2010 and the residential GAC system was removed on March 8, 2010. Residence was connected to LHWA on August 19, 2009 and the residential GAC system was removed.



### 11/3/10 Page 3 of 4 Table 4.6

### Table 4.6 Status of Residents Qualified for GAC Treatment Receiving Alternative Treatment or Not Being Sampled Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

RESIDENT SAMPLE_NUMBER DATESMPL APFO (ppb or ug/L) *PFOA (ppb or ug/L) **LOD (ppb or ug/L) **LOQ (ppb or ug/L) Comments YoungNM WWK-D-YOUNGNM-BED1 3/7/2008 <0.0022 <0.0022 0.0022 0.011 WWK-D-YOUNGNM-BED1 12/3/2007 <0.0031 <0.0031 0.0031 0.016 WWK-D-YOUNGNM-PT 8/23/2007 NQ NQ 0.0012 0.0062 WWK-D-YOUNGNM-BED1 8/23/2007 <0.0012 <0.0012 0.0012 0.0062 WWK-D-YOUNGNM-BED1 6/13/2007 <0.0027 <0.0027 0.0027 0.013 WWK-D-YOUNGNM-BED1 2/28/2007 <0.0010 <0.0010 0.0010 0.0051 WWK-D-YOUNGNM-BED1 12/13/2006 <0.0018 <0.0018 0.0018 0.0090 WWK-D-YOUNGNM-BED1 8/11/2006 <0.0026 <0.0026 0.0026 0.013 WWK-D-YOUNGNM-PT 6/21/2006 <0.0012 <0.0012 0.0012 0.006 WWK-D-YOUNGNM-PT-2 6/21/2006 <0.0012 <0.0012 0.0012 0.006 WWK-D-YOUNGNM-BED1 6/21/2006 <0.0012 <0.0012 0.0012 0.006 LTL-D-16744(1203) 9/2/2005 0.0553 0.0531 0.0015 0.0073 WindlandNB WWO-D-16809 6/5/2006 0.884 0.849 0.0012 0.006 Residence has well and lake water, GAC system can not be installed. Bottled water provided as interim and alternative treament. No response to alternative treatment offer. New well installed in July 2008 by coal company and was sampled in September 2008. Results were ND. Young signed agreement on December 23, 2008 to have GAC removed from old well because new well has ND PFOA.



### 11/3/10 Page 4 of 4 Table 4.6

### Table 4.8 Order on Consent Phase I - Historic and GAC System Samples Quarterly MOU Progress Report #20 DuPont Washington Works (OPPT-2004-0113)

RESIDENT SAMPLE_NUMBER DATESMPL APFO (ug/L) PFOA (ug/L) *LOD (ug/L) *LOQ (ug/L) Blennerhassett WWK-D-WINTERWELLBHI-PT 8/31/2010 0.052 0.050 0.0025 0.012 Island WWK-D-WINTERWELLBHI-PT-2 8/31/2010 0.057 0.055 0.0025 0.012 WWK-D-WINTERWELLBHI-BED1 8/31/2010 <0.0025 <0.0025 0.0025 0.012 WWK-D-WINTERWELLBHI-BED1-2 8/31/2010 <0.0025 <0.0025 0.0025 0.012 WWK-D-WINTERWELLBHI-PT 5/25/2010 0.074 0.071 0.0038 0.019 WWK-D-WINTERWELLBHI-PT-2 5/25/2010 0.069 0.066 0.0038 0.019 WWK-D-WINTERWELLBHI-BED1 5/25/2010 <0.0038 <0.0038 0.0038 0.019 WWK-D-WINTERWELLBHI-BED1-2 5/25/2010 <0.0038 <0.0038 0.0038 0.019

WWK-D-WINTERWELLBHI-BED1 3/12/2010 <0.0035 <0.0035 0.0035 0.018 WWK-D-WINTERWELLBHI-BED1-2 3/12/2010 <0.0035 <0.0035 0.0035 0.018 WWK-D-WINTERWELLBHI-BED1-2 12/8/2009 <0.0021 <0.0021 0.0021 0.010 WWK-D-WINTERWELLBHI-PT 9/18/2009 0.050 0.048 0.0026 0.013 WWK-D-WINTERWELLBHI-PT-2 9/18/2009 0.050 0.048 0.0026 0.013 WWK-D-WINTERWELLBHI-BED1 9/18/2009 <0.0026 <0.0026 0.0026 0.013 WWK-D-WINTERWELLBHI-BED1-2 9/18/2009 <0.0026 <0.0026 0.0026 0.013

WWK-D-WINTERWELLBHI-BED1 6/22/2009 <0.0026 <0.0026 0.0026 0.013 WWK-D-WINTERWELLBHI-BED1 3/6/2009 <0.0026 <0.0026 0.0026 0.013 WWK-D-WINTERWELLBHI-BED1 11/5/2008 <0.0017 <0.0017 0.0017 0.0085

WWK-D-WINTERWELLBHI-PT 8/15/2008 0.034 0.033 0.0023 0.012 WWK-D-WINTERWELLBHI-BED1 8/15/2008 <0.0023 <0.0023 0.0023 0.012 WWK-D-WINTERWELLBHI-BED1 6/13/2008 <0.0019 <0.0019 0.0019 0.0096 WWK-D-WINTERWELL-BHI-BED1 2/25/2008 <0.005 <0.005 0.005 0.025 WWK-D-WINTERWELL-BHI-BED1 10/11/2007 <0.0031 <0.0031 0.0031 0.016

WWK-D-WINTERWELLBHI-PT 7/25/2007 0.055 0.053 0.0012 0.0062 WWK-D-WINTERWELLBHI-BED1 7/25/2007 <0.0012 <0.0012 0.0012 0.0062 Winter Well-BHI 4/7/2006 0.611 0.587 0.0012 0.006 BLENISLEPS1 7/14/2005 0.034 0.033 0.01 0.05 BLENISLEPS1 1/30/2002 0.165 0.158 0.01 0.05 Bonar A WWO-D-BONARA-PT 9/1/2010 2.6 2.5 0.025 0.12 WWO-D-BONARA-BED1 9/1/2010 <0.0025 <0.0025 0.0025 0.012 WWO-D-BONARA-BED1 5/12/2010 <0.0038 <0.0038 0.0038 0.019 WWO-D-BONARA-BED1 3/2/2010 <0.0035 <0.0035 0.0035 0.018 WWO-D-BONARA-BED1 12/7/2009 NQ NQ 0.0021 0.01 WWO-D-BONARA-BED2 12/7/2009 <0.0033 <0.0033 0.0033 0.016

WWO-D-BONARA-PT 9/3/2009 2.6 2.5 0.026 0.13 WWO-D-BONARA-BED1 9/3/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-BONARA-BED1 6/9/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-BONARA-BED1 2/25/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-BONARA-BED1 12/4/2008 <0.0017 <0.0017 0.0017 0.0085

WWO-D-BONARA-PT 7/29/2008 2.1 2.0 0.023 0.12 WWO-D-BONARA-BED1 7/29/2008 <0.0023 <0.0023 0.0023 0.012 WWO-D-BONARA-BED1 4/11/2008 <0.0019 <0.0019 0.0019 0.0096 WWO-D-BONARA-BED1 1/7/2008 <0.0022 <0.0022 0.0022 0.011

WWO-D-BONARA-PT 10/11/2007 1.9 1.8 0.031 0.16 WWO-D-BONARA-BED1 10/11/2007 <0.0031 <0.0031 0.0031 0.016

WWO-D-SnodgrassAM 6/6/2007 2 1.9 <0.0027 <0.013 CraynonT WWK-D-CRAYNONTL-PT 9/21/2009 0.83 0.80 0.0026 0.013 WWK-D-CRAYNONTL-BED1 9/21/2009 <0.0026 <0.0026 0.0026 0.013 WWK-D-CRAYNONTL-BED1 6/30/2009 <0.0026 <0.0026 0.0026 0.013 WWK-D-CRAYNONTL-BED1 3/6/2009 <0.0026 <0.0026 0.0026 0.013 WWK-D-CRAYNONTL-BED1 11/5/2008 <0.0017 <0.0017 0.0017 0.0085

WWK-D-CRAYNONTL-PT 8/15/2008 0

. 91 0

. 87 0

. 0023 0

. 012

11/3/10 Page 1 of 7 Table 4.8

### Table 4.8 Order on Consent Phase I - Historic and GAC System Samples Quarterly MOU Progress Report #20 DuPont Washington Works (OPPT-2004-0113)

RESIDENT SAMPLE_NUMBER DATESMPL APFO (ug/L) PFOA (ug/L) *LOD (ug/L) *LOQ (ug/L)

WWK-D-CRAYNONTL-BED1 8/15/2008 <0.0023 <0.0023 0.0023 0.012 WWK-D-CRAYNONTL-BED1 6/14/2008 <0.0019 <0.0019 0.0019 0.0096 WWK-D-CRAYNONTL-BED1 2/27/2008 NQ (<0.011) NQ (<0.011) 0.0022 0.011 WWK-D-CRAYNONTL-BED2 2/27/2008 <0.0022 <0.0022 0.0022 0.011 WWK-D-CRAYNONTL-BED1 11/20/2007 <0.0031 <0.0031 0.0031 0.016

WWK-D-CRAYNONTL-PT 7/23/2007 1 0.96 0.0012 0.0062 WWK-D-CRAYNONTL-BED1 7/23/2007 <0.0012 <0.0012 0.0012 0.0062 WWK-D-CraynonT 1/31/2005 0.945 0.907 0.01 0.05 DavisKL WWO-D-DAVISKL-PT 9/1/2010 0.78 0.75 0.0025 0.012 WWO-D-DAVISKL-BED1 9/1/2010 <0.0025 <0.0025 0.0025 0.012 WWO-D-DAVISKL-BED1 5/13/2010 <0.0038 <0.0038 0.0038 0.019 WWO-D-DAVISKL-BED1 3/10/2010 <0.0035 <0.0035 0.0035 0.018 WWO-D-DAVISKL-BED1 12/10/2009 <0.0033 <0.0033 0.0033 0.016

WWO-D-DAVISKL-PT 9/17/2009 0.74 0.71 0.0026 0.013 WWO-D-DAVISKL-BED1 9/17/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-DAVISKL-BED1 6/12/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-DAVISKL-BED1 2/26/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-DAVISKL-BED1 12/4/2008 <0.0017 <0.0017 0.0017 0.0085

WWO-D-DAVISKL-PT 7/29/2008 0.59 0.57 0.0023 0.012 WWO-D-DAVISKL-BED1 7/29/2008 <0.0023 <0.0023 0.0023 0.012 WWO-D-DAVISKL-BED1 4/11/2008 <0.005 <0.005 0.005 0.025 WWO-D-DAVISKL-BED1 1/8/2008 <0.0022 <0.0022 0.0022 0.011

WWO-D-DAVISKL-PT 10/11/2007 0.66 0.63 0.0031 0.016 WWO-D-DAVISKL-BED1 10/11/2007 <0.0031 <0.0031 0.0031 0.016 WWO-D-DavisKL 5/7/2007 0.8 0.77 <0.0027 <0.013 EllenwoodSM WWO-D-ELLENWOODSM-PT 9/1/2010 2.4 2.3 0.025 0.12 WWO-D-ELLENWOODSM-BED1 9/1/2010 <0.0025 <0.0025 0.0025 0.012 WWO-D-ELLENWOODSM-BED1 5/12/2010 <0.0038 <0.0038 0.0038 0.019 WWO-D-ELLENWOODSM-BED1 3/2/2010 <0.0035 <0.0035 0.0035 0.018 WWO-D-ELLENWOODSM-BED1 12/8/2009 <0.0021 <0.0021 0.0021 0.01

WWO-D-ELLENWOODSM-PT 9/3/2009 1.9 1.8 0.026 0.13 WWO-D-ELLENWOODSM-BED1 9/3/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-ELLENWOODSM-BED1 6/9/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-ELLENWOODSM-BED1 2/25/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-ELLENWOODSM-BED1-2 2/25/2009 <0.0026 <0.0026 0.0026 0.013

WWO-D-ELLENWOODSM-BED1 10/31/2008 <0.0017 <0.0017 0.0017 0.0085

WWO-D-ELLENWOODSM-PT 7/29/2008 1.5 1.4 0.023 0.12 WWO-D-ELLENWOODSM-BED1 7/29/2008 <0.0023 <0.0023 0.0023 0.012 WWO-D-ELLENWOODSM-BED1 4/11/2008 <0.005 <0.005 0.005 0.025 WWO-D-ELLENWOODSM-BED1 1/7/2008 <0.0022 <0.0022 0.0022 0.011

WWO-D-ELLENWOODSM-PT 10/12/2007 1.5 1.4 0.031 0.16 WWO-D-ELLENWOODSM-BED1 10/12/2007 <0.0031 <0.0031 0.0031 0.016 WWO-D-EllenwoodSM 5/7/2007 1.3 1.2 <0.0027 <0.013 FarleyMD WWO-D-FARLEYMD-PT 9/10/2010 0.68 0.65 0.0025 0.012 WWO-D-FARLEYMD-BED1 9/10/2010 <0.0025 <0.0025 0.0025 0.012 WWO-D-FARLEYMD-BED1 5/13/2010 <0.0038 <0.0038 0.0038 0.019 WWO-D-FARLEYMD-BED1-2 5/13/2010 <0.0038 <0.0038 0.0038 0.019

WWO-D-FARLEYMD-BED1 3/2/2010 <0.0035 <0.0035 0.0035 0.018 WWO-D-FARLEYMD-BED1-2 3/2/2010 <0.0035 <0.0035 0.0035 0.018

WWO-D-FARLEYMD-BED1 12/10/2009 <0.0033 <0.0033 0.0033 0.016

WWO-D-FARLEYMD-PT 9/4/2009 0.73 0.70 0.0026 0.013 WWO

- D

- FARLEYMD

- BED1 9/4/2009 < 0

. 0026 < 0

. 0026 0

. 0026 0

. 013

11/3/10 Page 2 of 7 Table 4.8

### Table 4.8 Order on Consent Phase I - Historic and GAC System Samples Quarterly MOU Progress Report #20 DuPont Washington Works (OPPT-2004-0113)

RESIDENT SAMPLE_NUMBER DATESMPL APFO (ug/L) PFOA (ug/L) *LOD (ug/L) *LOQ (ug/L) WWO-D-FARLEYMD-BED1 6/12/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-FARLEYMD-BED1 2/26/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-FARLEYMD-BED1 12/8/2008 <0.0017 <0.0017 0.0017 0.0085

WWO-D-FARLEYMD-PT 7/29/2008 0.50 0.48 0.0023 0.012 WWO-D-FARLEYMD-BED1 7/29/2008 <0.0023 <0.0023 0.0023 0.012 WWO-D-FARLEYMD-BED1 4/11/2008 <0.005 <0.005 0.005 0.025 WWO-D-FARLEYMD-BED1 1/8/2008 <0.0022 <0.0022 0.0022 0.011

WWO-D-FARLEYMD-PT 10/11/2007 0.54 0.52 0.0031 0.016 WWO-D-FARLEYMD-BED1 10/11/2007 <0.0031 <0.0031 0.0031 0.016 WWO-D-FarleyMD 5/11/2007 0.61 0.59 <0.0027 <0.013 Gotshall** WWO-D-2725BEACHDR-PT 9/1/2010 2.1 2.0 0.025 0.12 WWO-D-2725BEACHDR-PT-2 9/1/2010 1.9 1.8 0.025 0.12 WWO-D-2725BEACHDR-BED1 9/1/2010 <0.0025 <0.0025 0.0025 0.012 WWO-D-2725BEACHDR-BED1-2 9/1/2010 <0.0025 <0.0025 0.0025 0.012

WWO-D-2725BEACHDR-BED1 4/2/2010 <0.0038 <0.0038 0.0038 0.019 WWO-D-2725BEACHDR-BED1 10/26/2009 <0.0033 <0.0033 0.0033 0.016

WWO-D-2725BEACHDR-PT 9/4/2009 2.1 2.0 0.026 0.13 WWO-D-2725BEACHDR-BED1 9/4/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-2725BEACHDR-BED1 4/14/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-2725BEACHDR-BED1 10/31/2008 <0.0017 <0.0017 0.0017 0.0085 WWO-D-2725BEACHDR-BED1-2 10/31/2008 <0.0017 <0.0017 0.0017 0.0085 WWO-D-2725BEACHDR-PT 8/19/2008 2.3 2.2 0.023 0.12 WWO-D-2725BEACHDR-BED1 8/19/2008 <0.0023 <0.0023 0.0023 0.012 WWO-D-2725BEACHDR-BED1 6/13/2008 <0.0019 <0.0019 0.0019 0.0096

WWO-D-2725BEACHDR-PT 10/11/2007 2.3 2.2 0.031 0.16 WWO-D-2725BEACHDR-BED1 10/11/2007 <0.0031 <0.0031 0.0031 0.016 WWO-D-FosterTV 8/14/2002 0.812 0.78 0.01 0.05 HosingerMD WWO-D-HOSINGERMD-PT 8/31/2010 1.5 1.4 0.025 0.12 WWO-D-HOSINGERMD-BED1 8/31/2010 <0.0025 <0.0025 0.0025 0.012 WWO-D-HOSINGERMD-BED1 4/1/2010 <0.0038 <0.0038 0.0038 0.019 WWO-D-HOSINGERMD-BED1 3/2/2010 NQ NQ 0.0035 0.018 WWO-D-HOSINGERMD-BED2 3/2/2010 NQ NQ 0.0035 0.018 WWO-D-HOSINGERMD-BED1 12/10/2009 <0.0033 <0.0033 0.0033 0.016 WWO-D-HOSINGERMD-BED1-2 12/10/2009 <0.0033 <0.0033 0.0033 0.016 WWO-D-HOSINGERMD-PT 9/3/2009 1.1 1.1 0.026 0.13 WWO-D-HOSINGERMD-BED1 9/3/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-HOSINGERMD-BED1 6/9/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-HOSINGERMD-BED1 2/26/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-HOSINGERMD-BED1 11/11/2008 <0.0017 <0.0017 0.0017 0.0085

WWO-D-HOSINGERMD-PT 7/29/2008 0.93 0.89 0.0023 0.012 WWO-D-HOSINGERMD-BED1 7/29/2008 <0.0023 <0.0023 0.0023 0.012 HOSINGERMD-BED2 4/7/2008 NQ (<0.0096) NQ (<0.0096) 0.0019 0.0096 HOSINGERMD-BED1 4/7/2008 NQ (<0.0096) NQ (<0.0096) 0.0019 0.0096 WWO-D-HOSINGERMD-BED1 1/7/2008 NQ (<0.011) NQ (<0.011) 0.0022 0.011 WWO-D-HOSINGERMD-BED2 1/7/2008 <0.0022 <0.0022 0.0022 0.011

WWO-D-HOSINGERMD-PT 11/20/2007 1 0.99 0.0031 0.016 WWO-D-HOSINGERMD-BED1 11/20/2007 <0.0031 <0.0031 0.0031 0.016 WWO-D-HosingerMD 6/21/2007 1 1 <0.0012 <0.0062 MooreMK WWO-D-MOOREMK-PT 9/1/2010 2.3 2.2 0.025 0.12 WWO-D-MOOREMK-BED1 9/1/2010 <0.0025 <0.0025 0.0025 0.012 WWO-D-MOOREMK-BED1 5/24/2010 <0.0038 <0.0038 0.0038 0.019 WWO

- D

- MOOREMK

- BED1 3/17/2010 < 0

. 0035 < 0

. 0035 0

. 0035 0

. 018

11/3/10 Page 3 of 7 Table 4.8

### Table 4.8 Order on Consent Phase I - Historic and GAC System Samples Quarterly MOU Progress Report #20 DuPont Washington Works (OPPT-2004-0113)

RESIDENT SAMPLE_NUMBER DATESMPL APFO (ug/L) PFOA (ug/L) *LOD (ug/L) *LOQ (ug/L) WWO-D-MOOREMK-BED1 12/10/2009 <0.0033 <0.0033 0.0033 0.016

WWO-D-MOOREMK-PT 9/17/2009 2.1 2 0.026 0.13 WWO-D-MOOREMK-BED1 9/17/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-MOOREMK-BED1 6/11/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-MOOREMK-BED1 2/25/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-MOOREMK-BED1 12/11/2008 <0.0017 <0.0017 0.0017 0.0085

WWO-D-MOOREMK-PT 7/29/2008 1.8 1.7 0.023 0.12 WWO-D-MOOREMK-BED1 7/29/2008 <0.0023 <0.0023 0.0023 0.012 WWO-D-MOOREMK-BED1 4/11/2008 <0.005 <0.005 0.005 0.025 WWO-D-MOOREMK-BED1 1/10/2008 <0.0022 <0.0022 0.0022 0.011

WWO-D-MOOREMK-PT 10/12/2007 1.8 1.7 0.031 0.16 WWO-D-MOOREMK-BED1 10/12/2007 <0.0031 <0.0031 0.0031 0.016 WWO-D-MooreMK 5/24/2007 1.8 1.7 <0.0027 <0.013 MoorePE WWO-D-MOOREPE-PT 9/1/2010 0.026 0.025 0.0025 0.012 WWO-D-MOOREPE-BED1 9/1/2010 <0.0025 <0.0025 0.0025 0.012

WWO-D-MOOREPE-PT 5/24/2010 2.4 2.3 0.038 0.19 WWO-D-MOOREPE-BED1 5/24/2010 <0.0038 <0.0038 0.0038 0.019 WWO-D-MOOREPE-BED1 3/17/2010 NQ NQ 0.0035 0.018 WWO-D-MOOREPE-BED2 3/17/2010 <0.0035 <0.0035 0.0035 0.018 WWO-D-MOOREPE-BED1 12/10/2009 <0.0033 <0.0033 0.0033 0.016

WWO-D-MOOREPE-PT 9/17/2009 0.025 0.024 0.0026 0.013 WWO-D-MOOREPE-BED1 9/17/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-MOOREPE-BED1 6/11/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-MOOREPE-BED1 2/25/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-MOOREPE-BED1 12/11/2008 <0.0017 <0.0017 0.0017 0.0085

WWO-D-MOOREPE-PT 7/29/2008 0.092 0.088 0.0023 0.012 WWO-D-MOOREPE-PT-2 7/29/2008 0.086 0.083 0.0023 0.012 WWO-D-MOOREPE-BED1 7/29/2008 <0.0023 <0.0023 0.0023 0.012 WWO-D-MOOREPE-BED1-2 7/29/2008 <0.0023 <0.0023 0.0023 0.012

WWO-D-MOOREPE-BED1 4/11/2008 <0.005 <0.005 0.005 0.025 WWO-D-MOOREPE-BED1 1/10/2008 <0.0022 <0.0022 0.0022 0.011

WWO-D-MOOREPE-PT 10/12/2007 0.019 0.018 0.0031 0.016 WWO-D-MOOREPE-BED1 10/12/2007 <0.0031 <0.0031 0.0031 0.016 WWO-D-MoorePE 5/24/2007 0.76 0.73 <0.0027 <0.013 MooreSE WWO-D-MOORESE-PT 8/31/2010 1.9 1.8 0.025 0.12 WWO-D-MOORESE-BED1 8/31/2010 <0.0025 <0.0025 0.0025 0.012 WWO-D-MOORESE-BED1 5/12/2010 <0.0038 <0.0038 0.0038 0.019 WWO-D-MOORESE-BED1 3/2/2010 <0.0035 <0.0035 0.0035 0.018 WWO-D-MOORESE-BED1 12/10/2009 <0.0033 <0.0033 0.0033 0.016

WWO-D-MOORESE-PT 9/3/2009 1.1 1.1 0.026 0.13 WWO-D-MOORESE-BED1 9/3/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-MOORESE-BED1 6/9/2009 NQ NQ 0.0026 0.013 WWO-D-MOORESE-BED2 6/9/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-MOORESE-BED1 2/26/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-MOORESE-BED1 11/11/2008 <0.0017 <0.0017 0.0017 0.0085

WWO-D-MOORESE-PT 7/29/2008 0.82 0.79 0.0023 0.012 WWO-D-MOORESE-BED1 7/29/2008 <0.0023 <0.0023 0.0023 0.012 WWO-D-MOORESE-BED1 4/7/2008 <0.0019 <0.0019 0.005 0.025 WWO-D-MOORESE-BED1 1/7/2008 <0.0022 <0.0022 0.0022 0.011

WWO-D-MOORESE-PT 10/11/2007 1.4 1.3 0.031 0.16 WWO-D-MOORESE-BED1 10/11/2007 <0.0031 <0.0031 0.0031 0.016 WWO-D-MooreSE 5/23/2007 1 1 < 0

. 0027 < 0

. 013

11/3/10 Page 4 of 7 Table 4.8

### Table 4.8 Order on Consent Phase I - Historic and GAC System Samples Quarterly MOU Progress Report #20 DuPont Washington Works (OPPT-2004-0113)

RESIDENT SAMPLE_NUMBER DATESMPL APFO (ug/L) PFOA (ug/L) *LOD (ug/L) *LOQ (ug/L) RaderJM WWO-D-RADERJM-PT 8/31/2010 0.15 0.14 0.0025 0.012 WWO-D-RADERJM-PT-2 8/31/2010 0.15 0.14 0.0025 0.012 WWO-D-RADERJM-BED1 8/31/2010 <0.0025 <0.0025 0.0025 0.012 WWO-D-RADERJM-BED1-2 8/31/2010 <0.0025 <0.0025 0.0025 0.012 WWO-D-RADERJM-PT 5/13/2010 0.64 0.61 0.0038 0.019 WWO-D-RADERJM-BED1 5/13/2010 <0.0038 <0.0038 0.0038 0.019 WWO-D-RADERJM-BED1 3/8/2010 <0.0035 <0.0035 0.0035 0.018 WWO-D-RADERJM-BED1-2 3/8/2010 <0.0035 <0.0035 0.0035 0.018

WWO-D-RADERJM-BED1 12/10/2009 <0.0033 <0.0033 0.0033 0.016

WWO-D-RADERJM-PT 9/3/2009 0.11 0.11 0.0026 0.013 WWO-D-RADERJM-BED1 9/3/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-RADERJM-BED1 6/9/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-RADERJM-BED1 2/13/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-RADERJM-BED1 11/11/2008 <0.0017 <0.0017 0.0017 0.0085

WWO-D-RADERJM-PT 7/29/2008 0.33 0.32 0.0023 0.012 WWO-D-RADERJM-BED1 7/29/2008 <0.0023 <0.0023 0.0023 0.012 WWO-D-RADERJM-BED1 4/11/2008 <0.0019 <0.0019 0.0019 0.0096 WWO-D-RADERJM-BED1 1/7/2008 <0.0022 <0.0022 0.0022 0.011

WWO-D-RADERJM-PT 10/12/2007 0.1 0.099 0.0031 0.016 WWO-D-RADERJM-BED1 10/12/2007 <0.0031 <0.0031 0.0031 0.016 WWO-D-RaderJM 4/26/2007 0.55 0.53 <0.0027 <0.013 SchofieldK A WWO-D-SCHOFIELDKA-PT 8/31/2010 2.2 2.1 0.025 0.12 WWO-D-SCHOFIELDKA-BED1 8/31/2010 <0.0025 <0.0025 0.0025 0.012 WWO-D-SCHOFIELDKA-BED1 5/12/2010 <0.0038 <0.0038 0.0038 0.019 WWO-D-SCHOFIELDKA-BED1 3/2/2010 NQ NQ 0.0035 0.018 WWO-D-SCHOFIELDKA-BED2 3/2/2010 <0.0035 <0.0035 0.0035 0.018 WWO-D-SCHOFIELDKA-BED1 12/10/2009 NQ NQ 0.0033 0.016 WWO-D-SCHOFIELDKA-BED2 12/10/2009 <0.0033 <0.0033 0.0033 0.016

WWO-D-SCHOFIELDKA-PT 9/3/2009 1.9 1.8 0.026 0.13 WWO-D-SCHOFIELDKA-BED1 9/3/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-SCHOFIELDKA-BED1 6/9/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-SCHOFIELDKA-BED1-2 6/9/2009 <0.0026 <0.0026 0.0026 0.013

WWO-D-SCHOFIELDKA-BED1 2/26/2009 NQ NQ 0.0026 0.013 WWO-D-SCHOFIELDKA-BED2 2/26/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-SCHOFIELDKA-BED1 11/11/2008 <0.0017 <0.0017 0.0017 0.0085

WWO-D-SCHOFIELDKA-PT 7/29/2008 1.1 1.1 0.023 0.12 WWO-D-SCHOFIELDKA-BED1 7/29/2008 <0.0023 <0.0023 0.0023 0.012 WWO-D-SCHOFIELDKA-BED2 4/7/2008 <0.0019 <0.0019 0.0019 0.0096 WWO-D-SCHOFIELDKA-BED1 4/7/2008 NQ (<0.0096) NQ (<0.0096) 0.0019 0.0096 WWO-D-SCHOFIELDKA-BED1 1/7/2008 <0.0022 <0.0022 0.0022 0.011

WWO-D-SCHOFIELDKA-PT 10/11/2007 1.6 1.5 0.031 0.16 WWO-D-SCHOFIELDKA-BED1 10/11/2007 <0.0031 <0.0031 0.0031 0.016 WWO-D-SchofieldKA 5/22/2007 1.2 1.2 <0.0027 <0.013 SmithDD WWO-D-SMITHDD-BED1 5/24/2010 <0.0038 <0.0038 0.0038 0.019 WWO-D-SMITHDD-BED1 3/12/2010 <0.0035 <0.0035 0.0035 0.018 WWO-D-SMITHDD-BED1 12/8/2009 <0.0021 <0.0021 0.0021 0.01

WWO-D-SMITHDD-PT 9/21/2009 4.2 4.0 0.026 0.13 WWO-D-SMITHDD-BED1 9/21/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-SMITHDD-BED1 3/6/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-SMITHDD-BED1 12/8/2008 <0.0017 <0.0017 0.0017 0.0085 WWO-D-SMITHDD-BED1 9/5/2008 <0.0023 <0.0023 0.0023 0.012 WWO-D-SMITHDD-BED1 4/11/2008 < 0

. 0019 < 0

. 0019 0

. 0019 0

. 0096

11/3/10 Page 5 of 7 Table 4.8

### Table 4.8 Order on Consent Phase I - Historic and GAC System Samples Quarterly MOU Progress Report #20 DuPont Washington Works (OPPT-2004-0113)

RESIDENT SAMPLE_NUMBER DATESMPL APFO (ug/L) PFOA (ug/L) *LOD (ug/L) *LOQ (ug/L)

WWO-D-SMITHDD 12/10/2007 4.1 3.9 0.013 0.016 WWO-D-SMITH DD 7/31/2002 1.81 1.74 0.1 0.5 TumeyMJ WWO-D-TUMEYMJ-PT 8/31/2010 0.93 0.89 0.0025 0.012 WWO-D-TUMEYMJ-BED1 8/31/2010 <0.0025 <0.0025 0.0025 0.012 WWO-D-TUMEYMJ-BED1 5/12/2010 <0.0038 <0.0038 0.0038 0.019 WWO-D-TUMEYMJ-BED1-2 5/12/2010 <0.0038 <0.0038 0.0038 0.019

WWO-D-TUMEYMJ-BED1 3/2/2010 <0.0035 <0.0035 0.0035 0.018 WWO-D-TUMEYMJ-BED1 12/7/2009 <0.0021 <0.0021 0.0021 0.01 WWO-D-TUMEYMJ-BED1-2 12/7/2009 <0.0021 <0.0021 0.0021 0.010 WWO-D-TUMEYMJ-PT 9/3/2009 0.75 0.72 0.0026 0.013 WWO-D-TUMEYMJ-PT-2 9/3/2009 0.71 0.68 0.0026 0.013 WWO-D-TUMEYMJ-BED1 9/3/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-TUMEYMJ-BED1-2 9/3/2009 <0.0026 <0.0026 0.0026 0.013

WWO-D-TUMEYMJ-BED1 6/9/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-TUMEYMJ-BED1 2/13/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-TUMEYMJ-BED1 12/4/2008 <0.0017 <0.0017 0.0017 0.0085

WWO-D-TUMEYMJ-PT 8/19/2008 0.55 0.53 0.0023 0.012 WWO-D-TUMEYMJ-BED1 8/19/2008 <0.0023 <0.0023 0.0023 0.012 WWO-D-TUMEYMJ-BED1-2 4/11/2008 <0.0019 <0.0019 0.0019 0.0096

WWO-D-TUMEYMJ-BED1 4/11/2008 <0.0019 <0.0019 0.0019 0.0096 WWO-D-TUMEYMJ-BED1 1/7/2008 <0.0022 <0.0022 0.0022 0.011

WWO-D-TUMEYMJ-PT 11/20/2007 0.53 0.51 0.0031 0.016 WWO-D-TUMEYMJ-BED1 11/20/2007 <0.0031 <0.0031 0.0031 0.016 WWO-D-TumeyMJ 5/18/2007 0.63 0.61 <0.0027 <0.013 WerryRC WWO-D-WERRYRC-PT 9/1/2010 0.62 0.60 0.0025 0.012 WWO-D-WERRYRC-BED1 9/1/2010 <0.0025 <0.0025 0.0025 0.012 WWO-D-WERRYRC-BED1 5/13/2010 <0.0038 <0.0038 0.0038 0.019 WWO-D-WERRYRC-BED1 3/8/2010 <0.0035 <0.0035 0.0035 0.018 WWO-D-WERRYRC-BED1 12/10/2009 <0.0033 <0.0033 0.0033 0.016

WWO-D-WERRYRC-PT 9/3/2009 0.53 0.51 0.0026 0.013 WWO-D-WERRYRC-BED1 9/3/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-WERRYRC-BED1 6/9/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-WERRYRC-BED1 2/13/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-WERRYRC-BED1 11/11/2008 <0.0017 <0.0017 0.0017 0.0085

WWO-D-WERRYRC-PT 7/29/2008 0.42 0.40 0.0023 0.012 WWO-D-WERRYRC-BED1 7/29/2008 <0.0023 <0.0023 0.0023 0.012 WWO-D-WERRYRC-BED1 4/11/2008 <0.0019 <0.0019 0.0019 0.0096 WWO-D-WERRYRC-BED1 1/7/2008 <0.0022 <0.0022 0.0022 0.011

WWO-D-WERRYRC-PT 10/12/2007 0.59 0.57 0.0031 0.016 WWO-D-WERRYRC-BED1 10/12/2007 <0.0031 <0.0031 0.0031 0.016 WWO-D-WerryRC 5/8/2007 0.76 0.73 <0.0027 <0.013 WigalGI WWO-D-WIGALGI-PT 9/1/2010 2.6 2.5 0.025 0.12 WWO-D-WIGALGI-BED1 9/1/2010 <0.0025 <0.0025 0.0025 0.012 WWO-D-WIGALGI-BED1 5/13/2010 <0.0038 <0.0038 0.0038 0.019 WWO-D-WIGALGI-BED1 3/3/2010 <0.0035 <0.0035 0.0035 0.018 WWO-D-WIGALGI-BED1 12/8/2009 <0.0021 <0.0021 0.0021 0.01

WWO-D-WIGALGI-PT 9/3/2009 2.4 2.3 0.026 0.13 WWO-D-WIGALGI-BED1 9/3/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-WIGALGI-BED1 6/4/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-WIGALGI-BED1 2/25/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-WIGALGI-BED1 12/4/2008 <0.0017 <0.0017 0.0017 0.0085

WWO-D-WIGALGI-PT 8/15/2008 2

. 3 2

. 2 0

. 023 0

. 12

11/3/10 Page 6 of 7 Table 4.8

### Table 4.8 Order on Consent Phase I - Historic and GAC System Samples Quarterly MOU Progress Report #20 DuPont Washington Works (OPPT-2004-0113)

RESIDENT SAMPLE_NUMBER DATESMPL APFO (ug/L) PFOA (ug/L) *LOD (ug/L) *LOQ (ug/L)

WWO-D-WIGALGI-BED1 8/15/2008 <0.0023 <0.0023 0.0023 0.012 WWO-D-WIGALGI-BED1 4/11/2008 <0.0019 <0.0019 0.0019 0.0096 WWO-D-WIGALGI-BED1 1/7/2008 <0.0022 <0.0022 0.0022 0.011

WWO-D-WIGALGI-PT 10/12/2007 2.8 2.7 0.031 0.16 WWO-D-WIGALGI-BED1 10/12/2007 <0.0031 <0.0031 0.0031 0.016 WWO-D-WigalGI 5/21/2007 2

. 3 2

. 2 < 0

. 0027 < 0

. 013 *Starting in July 2005, Limit of Detection (LOD) and Limit of Quantitiation (LOQ) were determined on at least a quarterly basis using the signal to noise determination described in the Phase II QAPP. **GAC system is winterized.

11/3/10 Page 7 of 7 Table 4.8Table 4.8AStatus of Order on Consent Phase I Residents Qualified for GAC Treatment Receiving Alternative TreatmentQuarterly MOU Status Report No. 20DuPont Washington Works (OPPT-2004-0113)RESIDENT SAMPLE_NUMBER DATESMPLAPFO(ppb orug/L)*PFOA(ppb orug/L)**LOD(ppb orug/L)**LOQ(ppb orug/L) CommentsWetzEO1620WWO-D-WETZEO1620-BED1 6/12/2009 <0.0026 <0.0026 0.0026 0.013WWO-D-WETZEO1620-BED1 2/26/2009 <0.0026 <0.0026 0.0026 0.013WWO-D-WETZEO1620-BED1 12/4/2008 <0.0017 <0.0017 0.0017 0.0085WWO-D-WETZEO1620-PT 7/29/2008 0.52 0.50 0.0023 0.012WWO-D-WETZEO1620-BED1 7/29/2008 <0.0023 <0.0023 0.0023 0.012WWO-D-WETZEO1620-BED1 4/11/2008 <0.0019 <0.0019 0.0019 0.0096WWO-D-WETZEO1620-BED1 1/8/2008 <0.0022 <0.0022 0.0022 0.011WWO-D-WETZEO1620-PT 10/11/2007 0.64 0.61 0.0031 0.016WWO-D-WETZEO1620-BED1 10/11/2007 <0.0031 <0.0031 0.0031 0.016WWO-D-WetzEO1620 5/3/2007 0.51 0.49 <0.0027 <0.013Residence was connected toWarren Water and SewerAssociation on August 31, 2009and the residential GAC systemwas removed.11/3/10Page 1 of 1Table 4.8A

### Table 4.9 Status of Private Water Systems Identified by EPA and DuPont (March 2009 Order on Consent) Quarterly MOU Progress Report #20 DuPont Washington Works (OPPT-2004-0113)

SRCNAME DATESMPL SAMPLE_NUMBER PFOA RsltPost Comments Updated Status as of 10/15/10 BaldersonB 8/29/2005 DRL-D-1017738 0.453 GAC offered GAC treatment system installed 5/12/09 and added to monitoring program BEDILIONJM 6/13/2007 WWO-D-BEDILIONJM 0.47 already has GAC treatment installed Kinetico GAC system installed by owner [5/13/09 PT = 0.55 ug/L, AT = ND (<0.00260 ug/l)], will be offered inclusion in quarterly monitoring program

BURNSCC 6/4/2007 WWO-D-BURNSCC 1 GAC offered 6/25/09 Ali learned that Benjamin Burns (grandson) has had ownership of house since March 2009 and wants PWS, but PWS lines are far from house, GAC letter delivered 7/27/09, Ali left message on 9/8/09, bottled water being delivered as of 9/9/09, Ali left message 10/28/09 CantleyWA 7/19/2002 WWO-D-CANTLEY WA 1.43 non-response, qualification to be determined pre-911 address and phone not in service, address to Crystal Springs, note from Ali - "We also delivered the envelope to William Cantley, but he was not very approchable. When we asked him to please give Robin a call he backed away and said "will try to" and shut the door. We did not get to confirm the new address, but a mailbox across the street was 1016 Gantsville Road. Robin, if you ever have to go to this house, make sure to bring someone along." Andrew notified EPA of unsafe situation, EPA in agreement to make no additional contact in person, but to follow up via letter. Unable to find complete mailing address for Cantley, so letter dated 04/22/10 will be hand-delivered to Cantley ASAP. Letter hand delivered 04/29/10, no response as of 06/04/10.

ConleyL (29450) 12/30/2004 WWO-D-1009054 0.474 GAC offered GAC treatment system installed 4/2/09 and added to monitoring program ConleyL2 (29470) 3/5/2009 WWO-D-CONLEYL2 0.036 sampled under New Order on Consent - not qualified not qualified for treatment, result <0.4 ug/L ENGLANDTK 6/1/2007 WWO-D-ENGLANDTK 0.4 non-response non-response to all contact attempts, final non-response letter sent 8/11/09 FouttyBL 3/19/2002 WWK-D-FOUTT BL 0.864 PWS connection offered connection to Lubeck PWS on 11/25/09 GOODWINJE 5/8/2007 WWO-D-GOODWINJE 0.44 GAC offered if resident connects well to household plumbing Uses bucket to get well water, cistern filled w/ Belpre water plumbed to house, Andrew discussed with EPA. DuPont will send letter offering treatment on well if well connected to household plumbing. Offer to sample cistern sent 09/09/10, no response as of 10/15/10

GrimRR 7/30/2002 WWO-D-GRIM RR 0.481 GAC offered GAC treatment system installed 4/2/09 and added to monitoring program HOLDRENRE 6/1/2007 WWO-D-HOLDRENRE 1.1 GAC offered GAC treatment system installed 7/1/09 and added to monitoring program KnoxJ 12/9/2005 WWK-D-16804 0.619 declined treatment decline all treatment, decline letter signed 4/17/09 LakeWashC2 1/15/2002 WWK-G-LAKE WASH C2 0.833 not qualified building was torn down and the well is not in service

11/3/10 Page 1 of 2 Table 4.9

### Table 4.9 Status of Private Water Systems Identified by EPA and DuPont (March 2009 Order on Consent) Quarterly MOU Progress Report #20 DuPont Washington Works (OPPT-2004-0113)

SRCNAME DATESMPL SAMPLE_NUMBER PFOA RsltPost Comments Updated Status as of 10/15/10 LAFRANCEMA 6/13/2007 WWO-D-LAFRANCEMA 0.48 GAC offered installation of GAC on hold, bacteriaissue yet to be resolved by resident, nonresponse to all attempts to contact, final non-response letter sent 8/12/09, offer of bottled water as an interim measure made 09/09/10, no response as of 10/15/10 LOWEJH 5/21/2007 WWO-D-LOWEJH 0.41 PWS connection offered connection to LHWA on 7/1/09 MerinarJL 9/23/2002 WWO-D-MERINAR JL 0.906 not qualified house has had PWS for several years PhillipsAE 4/25/2002 WWK-D-PHILIPS AE 0.7 not qualified residence connected to PWS prior to selling to new owner, well no longer in

use REALLDD 4/26/2007 WWO-D-REALLDD 0.46 non-response verbally accepted GAC offer, then verbally declined all treatment, decline letter mailed 6/23/09, no response to calls and messages, final non-response letter sent 9/10/09 SmithMT 2/5/2002 WWK-D-SMITH MT 1.28 GAC offered GAC treatment system installed 7/30/09 and added to monitoring program SPRAGUEBE 10/24/2007 WWO-D-SPRAGUEBE 0.4 GAC offered GAC treatment system installed 5/12/09 and added to monitoring program TURNERDA 5/9/2007 WWO-D-TURNERDA 0.43 GAC offered GAC treatment system installed 4/29/09 and added to monitoring program WAGGONERJL 5/1/2007 WWO-D-WAGGONERJL 0.41 GAC offered GAC treatment system installed 8/24/09 and added to monitoring program

11/3/10 Page 2 of 2 Table 4.9

### Table 4.10 March 2009 Order on Consent - Historic and GAC System Samples Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

RESIDENT SAMPLE_NUMBER DATESMPL APFO (ug/L) PFOA (ug/L) *LOD (ug/L) *LOQ (ug/L)

1652ClubDr WWK-D-1652CLUBDR-BED1 5/14/2010 <0.0038 <0.0038 0.0038 0.019 WWK-D-1652CLUBDR-BED1 3/9/2010 <0.0035 <0.0035 0.0035 0.018WWK-D183WASHINGTONCLUBDRBED1 12/14/2009 <0.0033 <0.0033 0.0033 0.016

WWK-D183WASHINGTONCLUBDR-P T 9/21/2009 2 1.9 0.033 0.16

WWK-D183WASHINGTONCLUBDRBED1 9/21/2009 <0.0026 <0.0026 0.0026 0.013

WWK-D-SMITH MT 2/5/2002 1.33 1.28 0.01 0.05 BaldersonB WWK-D-BALDERSONB-BED1 5/12/2010 <0.0038 <0.0038 0.0038 0.019 WWK-D-BALDERSONB-BED1 3/9/2010 <0.0035 <0.0035 0.0035 0.018 WWK-D-BALDERSONB-BED1 12/14/2009 <0.0033 <0.0033 0.0033 0.016

WWK-D-BALDERSONB-PT 9/22/2009 0.43 0.41 0.0026 0.013 WWK-D-BALDERSONB-BED1 9/22/2009 <0.0026 <0.0026 0.0026 0.013 WWK-D-BALDERSONB-BED1 6/12/2009 <0.0026 <0.0026 0.0026 0.013 DRL-D-1017738 8/29/2005 0.453 ConleyL WWO-D-CONLEYL-PT 9/7/2010 1.4 1.3 0.025 0.12 WWO-D-CONLEYL-BED1 9/7/2010 <0.0025 <0.0025 0.0025 0.012 WWO-D-CONLEYL-BED1 5/13/2010 <0.0038 <0.0038 0.0038 0.019 WWO-D-CONLEYL-BED1 3/10/2010 <0.0035 <0.0035 0.0035 0.018 WWO-D-CONLEYL-BED1 12/17/2009 <0.0033 <0.0033 0.0033 0.016

WWO-D-CONLEYL-PT 9/17/2009 0.84 0.81 0.0026 0.013 WWO-D-CONLEYL-BED1 9/17/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-CONLEYL-BED1 4/2/2009 <0.0043 <0.0043 0.0043 0.021 WWO-D-1009054 12/30/2004 0.494 0.474 0.01 0.05 GrimRR WWO-D-GRIMRR-PT 8/31/2010 1.8 1.7 0.025 0.12 WWO-D-GRIMRR-BED1 8/31/2010 <0.0025 <0.0025 0.0025 0.012 WWO-D-GRIMRR-BED1 5/12/2010 <0.0038 <0.0038 0.0038 0.019 WWO-D-GRIMRR-BED1 3/2/2010 <0.0035 <0.0035 0.0035 0.018 WWO-D-GRIMRR-BED1 12/8/2009 <0.0021 <0.0021 0.0021 0.01

WWO-D-GRIMRR-PT 9/3/2009 1.5 1.4 0.026 0.13 WWO-D-GRIMRR-BED1 9/3/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-GRIMRR-BED1 4/2/2009 <0.0043 <0.0043 0.0043 0.021 WWO-D-GRIM RR 7/30/2002 0.501 0.481 0.01 0.05 HOLDRENRE WWO-D-HOLDRENRE-PT 9/1/2010 1.9 1.8 0.025 0.12 WWO-D-HOLDRENRE-BED1 9/1/2010 <0.0025 <0.0025 0.0025 0.012 WWO-D-HOLDRENRE-BED1 5/13/2010 <0.0038 <0.0038 0.0038 0.019 WWO-D-HOLDRENRE-BED1 3/3/2010 <0.0035 <0.0035 0.0035 0.018 WWO-D-HOLDRENRE-BED1 12/7/2009 <0.0021 <0.0021 0.0021 0.01

WWO-D-HOLDRENRE-PT 9/17/2009 1.7 1.6 0.026 0.13 WWO-D-HOLDRENRE-BED1 9/17/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-HOLDRENRE-BED1 7/1/2009 NQ NQ 0.0026 0.013 WWO-D-HOLDRENRE-BED2 7/1/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-HOLDRENRE 6/1/2007 1.1 1.1 0.0027 0.013 SPRAGUEBE WWO-D-SPRAGUEBE-PT 8/31/2010 0.61 0.59 0.0025 0.012 WWO-D-SPRAGUEBE-BED1 8/31/2010 <0.0025 <0.0025 0.0025 0.012 WWO-D-SPRAGUEBE-BED1 5/14/2010 <0.0038 <0.0038 0.0038 0.019 WWO-D-SPRAGUEBE-BED1 3/2/2010 <0.0035 <0.0035 0.0035 0.018 WWO-D-SPRAGUEBE-BED1 12/7/2009 <0.0021 <0.0021 0.0021 0.01

WWO-D-SPRAGUEBE-PT 9/17/2009 0.65 0.62 0.0026 0.013 WWO-D-SPRAGUEBE-BED1 9/17/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-SPRAGUEBE-BED1 6/10/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-SPRAGUEBE 10/24/2007 0.42 0.4 0.0031 0.016

11/3/10 Page 1 of 2 Table 4.10

### Table 4.10 March 2009 Order on Consent - Historic and GAC System Samples Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

RESIDENT SAMPLE_NUMBER DATESMPL APFO (ug/L) PFOA (ug/L) *LOD (ug/L) *LOQ (ug/L)

TURNERDA WWO-D-TURNERDA-BED1 5/14/2010 <0.0038 <0.0038 0.0038 0.019 WWO-D-TURNERDA-BED1 3/15/2010 <0.0035 <0.0035 0.0035 0.018 WWO-D-TURNERDA-BED1 12/17/2009 <0.0033 <0.0033 0.0033 0.016

WWO-D-TURNERDA-PT 9/21/2009 0.50 0.48 0.0026 0.013 WWO-D-TURNERDA-BED1 9/21/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-TURNERDA-BED1 6/11/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-TURNERDA 5/9/2007 0.45 0.43 0.0027 0.013 WAGGONERJL WWO-D-WAGGONERJL-BED1 5/24/2010 <0.0038 <0.0038 0.0038 0.019 WWO-D-WAGGONERJL-BED1 3/2/2010 <0.0035 <0.0035 0.0035 0.018 WWO-D-WAGGONERJL-BED1 12/8/2009 <0.0021 <0.0021 0.0021 0.01

WWO-D-WAGGONERJL-PT 9/22/2009 0.53 0.51 0.0026 0.013 WWO-D-WAGGONERJL-BED1 9/22/2009 <0.0026 <0.0026 0.0026 0.013 WWO-D-WAGGONERJL 5/1/2007 0.43 0.41 0.0027 0.013

*Starting in July 2005, Limit of Detection (LOD) and Limit of Quantitiation (LOQ) were determined on at least a quarterly basis using the signal to noise determination described in the Phase II QAPP.

11/3/10 Page 2 of 2 Table 4.10Table 5.1Local Landfill Monitoring Well Construction and Groundwater Elevation DataQuarterly MOU Status Report #20DuPont Washington Works (OPPT-2004-0113)B-ZoneD-ZoneParametersMW4 MW6 MW9 MW10 MW12B* MW11A* MW13B* MW14B* MW11B*Measuring PointElevation (feet)847.55 796.27 788.54 805.94 764.28 663.83 750.80 672.04 665.12Total Depth (feet)157.10 93.09 81.39 87.75 94.94 42.37 139.87 57.28 115.95Well Diameter(inches)4 4 4 4 2 2 22 2SlotSize (inches)0.020 0.020 0.020 0.020 0.010 0.010 0.010 0.010 0.010Screen Length (feet)202020202020 15 15 20Screen Interval(feet)710.45 -690.45723.18 -703.18727.15 -707.15738.19 -718.19689.34 -669.34641.46 -621.46625.93 -610.93629.76 -614.76569.17 -549.17December-01692.55 719.69 727.78 720.67 -----January-02715.39 720.41 728.06 720.51 -----February-02715.28 719.76 728.01 720.73 -----March-02715.31 722.00 728.12 720.90 -----May-02714.93 721.52 728.48 721.84 -----August-02715.52 719.77 728.24 722.97 -----October-02715.53 719.56 728.10 723.01 681.93 640.42 648.29 627.74 563.60March-03715.52 721.95 728.30 724.81 692.72 645.69 648.88 628.61 570.61May-03715.28 721.02 728.44 725.12 694.38 648.36 648.95 629.99 573.91July-03715.35 719.88 728.85 725.39 694.96 649.32 648.90 629.38 568.71February-04715.36 720.61 728.26 727.31 697.47 650.12 649.00 629.70 581.70August-04715.34 719.47 728.59 728.17 -----November-04715.29 720.03 728.38 727.61 -----January-05714.9 720.33 728.46 727.46 -----July-05715.36 719.53 728.67 728.43 696.33 642.40 648.30 627.73 590.86January-06715.35 719.96 728.13 727.87 -----July-06715.49 719.59 728.33 727.62 --- --January-07715.36 721.35 727.34 728.11 -----July-07715.37 719.46 728.50 728.88 -----April-08715.37 719.89 728.79 728.36 -----September-08715.44 719.41 728.31 728.12 695.77 642.58 648.16 627.83 -January-09715.48 720.05 728.27 727.43 696.03 644.78 648.79 628.01 -September-09715.38 719.42 728.22 728.46 695.81 643.42 648.74 627.80 -January-10715.43 720.65 728.29 728.29 695.89 646.53 648.55 627.94 -August-10715.43 719.52 728.49 728.64 695.96 646.23 648.95 628.19 -*Well is not a required sampling location in current WV/NPDES permit.- Groundwater elevation not measured.Monitoring WellsA-ZoneC-ZoneGroundwater Elevation (feet)11/3/10Page 1 of 1 Tables 5.1 5.2 and 5.3Table 5.2Letart Landfill Monitoring Well Construction and Groundwater Elevation DataQuarterly MOU Status Report #20DuPont Washington Works (OPPT-2004-0113)ZoneUnder F-ZoneParametersMWL1 MWL7 MWL8 MWL15 MWL16 MWL17 MWL2A MWL11 MWL4 MWL13A MWL14A MWL5B MWL6 MWL9Measuring Point Elevation(feet)768.93 770.24 777.06 763.86 764.74 767.90 780.87 776.21 651.58 766.25 766.91 646.22 755.99 777.85Total Depth (feet)31.50 36.73 40.60 20.10 30.00 30.15 182.17 166.54 28.66 152.35 158.72 71.56 176.43 230.87Well Diameter (inches)24444444 2 44444Slot Size (inches)0.010 0.010 0.010 0.010 0.010 0.010 0.010 0.010 0.010 0.010Screen Length (feet)5 10 9 10 10 10 30 25 5 20 20 20 30 20Elevation ofScreen Interval(feet)742.43 -737.43743.51 -733.51745.46 -736.46757.058 -747.058747.736 -737.736750.552 -740.552628.70 -598.70634.67 -609.67627.92 -622.92655.10 -635.10628.19 -608.19594.66 -574.66609.56 -579.56566.98 -546.98December-01752.62 749.73 745.04 NA NA 628.08 - - 596.31 NA NAJanuary-02752.82 752.25 746.76 622.19 619.58 642.79 - - 596.64 582.26 552.12February-02752.65 751.87 745.05 622.23 620.70 639.99 - - 596.34 581.97 551.96March-02752.10 751.56 746.24 622.44 620.99 643.30 - - 596.86 581.82 551.79May-02750.27 751.16 745.41 622.28 621.28 643.08 - - 596.66 581.97 551.24August-02751.98 751.49 744.95 622.44 621.52 636.02 - - 596.25 582.34 552.51October-02751.02 751.75 745.43 622.38 621.10 632.47 621.07 627.04 596.86 582.05 551.73March-03750.10 751.72 745.60 622.27 621.53 643.06 629.81 628.41 597.08 582.73 553.08May-03749.03 750.99 746.62 622.21 621.43 643.10 630.36 628.37 597.04 582.27 552.06August-03748.89 751.09 745.11 622.49 621.79 641.11 630.22 628.7 596.77 582.41 551.91December-03749.82 751.88 745.49 622.12 621.3 642.93 - - 597.30 582.90 552.81February-04750.66 751.86 745.47 622.18 621.60 642.66 632.7 628.16 597.17 581.57 551.92May-04751.73 751.37 744.98 622.23 621.69 642.79 632.38 627.95 596.61 582.08 552.31August-04750.45 751.61 744.64 622.38 621.50 638.09 - - 596.87 582.01 552.29November-04749.02 752.19 745.27 621.94 621.14 643.07 633.01 627.20 597.03 582.04 552.2January-05749.67 752.19 745.27 622.59 621.76 643.05 633.91 627.76 596.99 582.04 550.85April-05752.12 751.66 746.97 622.82 621.35 643.13 633.05 628.03 597.18 581.89 552.68July-05750.52 751.61 744.43 623.21 621.46 640.26 632.52 627.45 596.77 582.17 552.16October-05749.93 752.29 745.48 622.13 620.97 637.77 632.02 626.43 597.04 582.34 552.37February-06748.67 752.39 745.55 622.34 620.97 643.06 633.01 626.69 597.10 582.43 552.14April-06748.18 751.57 745.45 622.26 621.06 642.99 632.71 626.85 597.26 582.53 551.94July-06748.32 751.01 745.8 622.01 620.97 642.52 632.33 626.68 597.20 582.71 551.8October-06749.37 752.0 746.07 621.94 621.1 642.88 631.89 626.9 596.31 582.75 552.21January-07748.62 752.0 748.9 761.79 744.09 743.62 622.02 621.3 642.87 632.21 627.0 595.42 583.01 551.64April-07752.23 751.66 745.38 - - - 622.53 621.7 642.93 632.73 627.41 594.87 583.5 551.71July-07750.7 751.32 744.63 749.62 742.74 743.98 622.6 621.21 642.81 632 626.95 595.12 583.65 551.51October-07749.02 751.92 744.56 - - - 622.19 620.99 640.39 631.28 626.55 595.27 583.51 dryJanuary-09748 751.80 745.34 749.59 744.07 742.11 621.72 620.87 642.83 631.98 626.10 595.77 583.41 551.48April-08749.05 751.01 745.97 - - - 621.87 621.19 643.23 632.03 627.07 595.77 583.32 551.7July-08748.68 750.63 746.23 748.33 742.91 742.72 622.35 621.42 642.11 631.93 626.81 595.88 583.48 551.82October-08749.78 751.12 744.39 - - - 621.82 621.16 642.54 630.78 626.28 595.62 583.42 551.92January-09748.30 751.34 744.71 749.06 741.54 741.87 622.13 621.01 642.27 632.27 626.19 595.59 583.19 554.15April-09748.46 750.44 747.32 - - - 622.34 620.96 642.11 632.22 626.65 595.62 582.84 551.60July-09751.03 750.43 744.41 749.09 743.28 743.22 621.88 621.36 641.04 632.05 626.75 595.17 582.79 552.80October-09748.59 751.09 744.36 - - - 621.84 620.95 641.23 631.52 626.24 595.62 581.92 551.50February-10752.20 751.34 745.56 749.58 743.65 742.99 621.86 620.91 639 632.8 626.08 595.66 582.27 552.59April-10753.48 751.58 744.68 749.01 745.41 744.12 621.95 621.35 638.65 632.51 626.71 576.22 582.11 552.1July-10750.00 751.45 746.01 749.78 743.59 743.62 621.84 621.15 638.08 631.94 626.09 595.62 582.16 552.22Oct-10748.87 751.99 744.36 749.35 742.61 742.92 621.78 620.91 638.04 631.23 625.52 595.67 581.99 552.13- Groundwater elevation not measured.F-ZoneMonitoring WellsGroundwater Elevation (feet)D/E- and F-ZoneA-Zone11/3/10Page 1 of 1Tables 5.1 5.2 and 5.3Table 5.3Dry Run Landfill Monitoring Well Construction Data and Groundwater Elevation DataQuarterly MOU Status Report #20DuPont Washington Works (OPPT-2004-0113)ZoneParametersMW-6A MW-12A MW-12B MW-13A MW-21A MW-16B MW-17B MW-18BMeasuring Point Elevation (feet)744.46 732.41 732.85 722.57 707.62 792.98 853.56 925.87Total Depth (feet)11.89 17.17 20.24 13.33 19.79 61.61 127.09 202.05Well Diameter (inches)2 4 4 4 24 4 4Slot Size (inches)0.010 0.010 0.010 0.010 0.010 0.010 0.010 0.010Screen Length (feet)5 10 5 10 20 20 20Elevation of Screen Interval (feet)720.24 - 715.24 722.61 - 712.61 714.24 - 709.24 697.83 - 687.83 751.37 - 731.57 746.47 - 726.47 743.82 - 723.82December-01737.81 727.30 728.11 714.35 - - - -January-02738.29 728.50 729.14 716.97 - - - -February-02738.26 727.99 728.70 714.16 - - - -March-02738.75 728.89 729.58 716.68 - - - -May-02738.25 728.97 729.67 716.70 - - - -August-02735.61 725.51 726.24 713.62 - - - -October-02736.92 725.91 726.64 713.97 703.00 736.49 737.19 757.47Feb/March-03739.49 728.99 729.71 717.67 704.97 746.31 751.88 755.11May-03739.02 729.21 729.94 716.69 704.43 747.09 754.37 755.22August-03738.11 727.55 728.32 713.68 702.95 747.48 755.64 754.97December-03738.72 728.86 729.59 716.06 - - - -February-04738.85 728.46 729.15 717.11 704.35 749.52 756.42 764.96May-04739.26 728.89 729.58 716.61 704.80 749.96 757.01 755.40August-04737.71 726.67 727.49 713.62 - - - -November-04738.65 728.16 728.87 714.20 - - - -January-05739.13 725.4 729.67 716.34 697.03 749.58 757.20 -May-05739.74 729.37 730.11 717.14 705.01 750.23 757.35 755.65July-05737.72 726.54 727.26 713.66 702.66 748.94 756.42 755.26October-05734.57 725.93 726.75 713.62 702.80 747.58 755.79 755.17January-06738.71 728.23 729.00 714.55 703.43 748.11 756.41 755.30April-06739.10 728.74 729.49 715.06 704.80 748.95 756.24 755.39July-06738.70 727.65 728.31 714.01 703.12 748.50 756.24 755.29October-06739.86 728.76 729.51 714.57 703.68 747.96 756.40 755.35January-07739.35 729.20 729.81 716.95 704.93 749.03 756.49 753.13April-07739.06 728.56 729.28 714.66 704.02 749.62 756.38 755.49July-07737.76 726.05 726.85 712.87 702.31 748.68 756.20 755.66October-07736.98 724.65 725.42 713.03 702.67 747.37 755.75 755.45January-09739.99 728.45 729.2 716.36 704.9 747.93 756.05 755.45April-08739.61 728.91 729.45 715.23 705.02 749.50 756.61 755.67July-08738.55 728.09 728.72 713.97 703.28 749.33 756.23 755.77October-09737.11 725.24 726.03 713.17 702.64 748.30 756.25 755.22January-09739.91 728.56 729.35 716.82 704.82 747.98 755.96 755.17April-09739.71 729.23 729.88 717.12 704.97 748.88 756.34 753.73July-09738.06 727.16 728.34 713.00 702.93 748.65 756.05 755.53October-09737.68 724.31 728.30 713.74 703.09 747.66 756.36 755.45January-10738.72 727.71 728.47 714.32 703.34 747.76 756.53 755.32April-10739.16 728.7 729.24 715.66 703.97 748.64 756.11 755.62July-10739.62 728.51 729.17 714.54 704.82 748.45 756.37 755.86October-10737.96 726.73 727.44 713.12 703.02 747.6 756.16 755.57- Groundwater elevation not measured.Monitoring WellsOverburden A-ZoneGroundwater Elevation (feet)11/3/10Page 1 of 2 Tables 5.1 5.2 and 5.3Table 5.3Dry Run Landfill Monitoring Well Construction Data and Groundwater Elevation DataQuarterly MOU Status Report #20DuPont Washington Works (OPPT-2004-0113)ZoneC-Zone Above A-ZoneParametersMW-19B MW-20B MW-12 MW-13 MW-15 MW-21B MW-14Measuring Point Elevation (feet)881.99 868.79 733.1 722.68 734.28 707.67 938.08Total Depth (feet)151.76 136.41 37.82 37.54 48.60 177.20 239.91Well Diameter (inches)4 4 4 4 2 4 10Slot Size (inches)0.010 0.010 0.010 0.010 0.010 0.010 NAScreen Length (feet)20 20 15 15 20 20 NAElevation of Screen Interval (feet)750.23 - 730.23 752.38 - 732.38 710.28 - 695.28 700.14 - 685.14 705.68 - 685.68 550.47 - 530.47 NADecember-01- - 724.40 711.81 716.10 - 754.09January-02- - 725.25 712.17 716.50 - 757.99February-02- - 725.40 711.46 716.33 - 754.87March-02- - 725.74 712.21 717.02 - 755.45May-02- - 725.99 712.54 716.88 - 755.12August-02- - 723.65 710.65 715.82 - 755.31October-02750.94 752.95 723.54 711.65 716.02 613.01 755.13Feb/March-03759.93 757.53 725.87 712.81 716.68 613.19 755.33May-03757.64 757.75 725.66 712.53 716.64 614.06 755.40August-03757.74 757.84 725.18 711.45 715.81 614.18 755.61December-03- - 726.16 712.29 716.65 - 755.16February-04757.87 757.84 725.93 712.09 716.48 614.68 755.29May-04758.96 757.98 725.27 711.98 716.27 615.35 755.60August-04- - 724.26 711.07 715.75 - 764.33November-04- - 725.39 711.90 716.20 - 755.13January-05757.93 757.94 729.65 712.09 716.67 - 755.46May-05758.21 758.28 725.89 712.25 716.59 - 755.33July-05757.85 757.99 724.04 710.87 715.69 - 753.57October-05757.59 757.79 723.82 711.23 715.66 - 755.51January-06757.27 757.67 725.63 711.86 716.19 - 755.56April-06757.84 757.97 725.58 711.50 716.08 - 755.52July-06758.00 758.08 724.78 711.50 715.84 - 755.68October-06757.9 758.04 725.81 712.23 716.77 614.25 800.57January-07758.03 758.24 726.15 712.31 716.64 - 755.55April-07758.17 758.71 725.94 711.57 716.34 - 755.8July-07755.27 758.08 723.75 710.50 715.19 - 756.02October-07758.28 758.84 722.91 710.24 715.24 - 755.71January-08758.21 758.47 725.39 712.23 716.45 - 755.66April-08758.58 758.64 725.72 711.73 715.65 - 755.88July-08758.78 758.84 725.42 711.74 716.09 - 755.76October-08758.14 758.23 723.77 710.77 715.14 - 755.57January-09757.74 757.59 725.55 712.48 716.43 - 755.93April-09758.13 757.97 725.69 712.16 716.2 - 755.71July-09758.21 758.35 724.87 711.06 715.37 - 755.76October-09758.09 758.01 724.67 711.68 715.59 - 755.78January-10757.91 757.79 725.52 711.48 715.73 - 755.70April-10758.04 758.04 725.97 711.61 716.08 707.67 756.03July-10758.14 758.09 725.1 711.96 715.48 - 755.98October-10757.94 758.06 724.48 711.08 715.23 707.67 755.88- Groundwater elevation not measured.Monitoring WellsA-Zone (con't) B-ZoneGroundwater Elevation (feet)11/3/10Page 2 of 2 Tables 5.1 5.2 and 5.3

## Table 5.4 DuPont Washington Works Site APFO in Surface Water Outlets 102 and 305 Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date Avg Monthly APFO (ug/L) * Max Daily APFO (ug/L ) OUTLET 102 September 2010 <100.0 <100.0 August 2010 <100.0 <100.0 July 2010 <100.0 <100.0 June 2010 <100.0 <100.0 May 2010 <100.0 <100.0 April 2010 <100.0 <100.0 March 2010 <100.0 <100.0 February 2010 180 500 January 2010 <100.0 <100.0 December 2009 <100 <100 November 2009 <100 <100 October 2009 <100 <100 September 2009 <100 <100 August 2009 <100 <100 July 2009 <100 <100 June 2009 50.0 500.0 May 2009 <100.0 <100.0 April 2009 <100.0 <100.0 March 2009 91.7 1100 February 2009 200 1600 January 2009 55 330 December 2008 8.3 100 November 2008 <100 <100 October 2008 <100 <100 September 2008 <100 <100 August 2008 <100 <100 July 2008 <100 <100 June 2008 25 100 May 2008 <100 <100 April 2008 <100 <100 March 2008 <100 <100 February 2008 <100 <100 January 2008 <100 <100 December 2007 <100 <100 November 2007 <100 <100 October 2007 <100 <100 September 2007 135.8 1000 August 2007 102 110 July 2007 <100 <100 June 2007 <100 <100 May 2007 <100 <100 April 2007 146 700 March 2007 <100 <100 February 2007 <100 <100 January 2007 <100 <100 December 2006 100.8 120 November 2006 <100 <100 October 2006 <100 <100 September 2006 108.3 200 August 2006 119.6 470 Active Sampling Locations

11/3/10 Page 1 of 4 Table 5.4

## Table 5.4 DuPont Washington Works Site APFO in Surface Water Outlets 102 and 305 Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date Avg Monthly APFO (ug/L) * Max Daily APFO (ug/L ) Active Sampling Locations

July 2006 <100 <100 June 2006 <100 <100 May 2006 <100 <100 April 2006 <100 <100 March 2006 <100 <100 February 2006 <100 <100 January 2006 <100 <100 December 2005 <100 <100 November 2005 <100 <100 October 2005 <100 <100 September 2005 <100 <100 August 2005 <100 <100 July 2005 <100 <100 June 2005 <100 <100 May 2005 <100 <100 April 2005 <100 <100 March 2005 <100 <100 February 2005 0.2 0.2 January 2005 <100 <100 December 2004 <100.0 <100.0 November 2004 <100.0 <100.0 October 2004 <0.1 <0.1 September 2004 <100.0 <100.0 August 2004 <100.0 <100.0 July 2004 <100.0 <100.0 June 2004 <100.0 <100.0 May 2004 ND ND April 2004 N/A N/A March 2004 N/A N/A February 2004 N/A N/A January 2004 N/A N/A December 2003 N/A N/A November 2003 N/A N/A October 2003 N/A N/A September 2003 N/A N/A OUTLET 305 September 2010 <100.0 <100.0 August 2010 <100.0 <100.0 July 2010 <100.0 <100.0 June 2010 <100.0 <100.0 May 2010 <100.0 <100.0 April 2010 March 2010 <100.0 <100.0 February 2010 <100.0 <100.0 January 2010 <100.0 <100.0 December 2009 <100 <100 November 2009 32.5 130 October 2009 <100 <100 September 2009 <100 <100 August 2009 <100 <100 July 2009 <100 <100 No flow due to area maintenance shutdown

11/3/10 Page 2 of 4 Table 5.4

## Table 5.4 DuPont Washington Works Site APFO in Surface Water Outlets 102 and 305 Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date Avg Monthly APFO (ug/L) * Max Daily APFO (ug/L ) Active Sampling Locations

June 2009 25.0 100.0 May 2009 550.0 5900.0 April 2009 177.9 1700.0 March 2009 166.7 1200 February 2009 12.5 100 January 2009 14.3 100 December 2008 <100 <100 November 2008 100 100 October 2008 <100 <100 September 2008 <100 <100 August 2008 12.5 100 July 2008 33.3 200 June 2008 44.4 400 May 2008 <100 <100 April 2008 400 400 March 2008 133.3 300 February 2008 <100 <100 January 2008 44 300 December 2007 33.3 300 November 2007 377.8 3400 October 2007 111.1 200 September 2007 <100 <100 August 2007 <100 <100 July 2007 <100 <100 June 2007 <100 <100 May 2007 12.5 100 April 2007 <100 <100 March 2007 <100 <100 February 2007 <100 <100 January 2007 <100 <100 December 2006 100 100 November 2006 138.9 450 October 2006 <100 <100 September 2006 <100 <100 August 2006 <100 <100 July 2006 <100 <100 June 2006 <100 <100 May 2006 <100 <100 April 2006 <100 <100 March 2006 111.1 200 February 2006 <100 <100 January 2006 100 100 December 2005 30 140 November 2005 <100 <100 October 2005 <100 <100 September 2005 <100 <100 August 2005 15.6 140 July 2005 22.5 180 June 2005 <100.0 <100.0 May 2005 <100.0 <100.0

11/3/10 Page 3 of 4 Table 5.4

## Table 5.4 DuPont Washington Works Site APFO in Surface Water Outlets 102 and 305 Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date Avg Monthly APFO (ug/L) * Max Daily APFO (ug/L ) Active Sampling Locations

April 2005 <100.0 <100.0 March 2005 102.2 760 February 2005 <100.0 <100.0 January 2005 <100.0 <100.0 December 2004 <100.0 <100.0 November 2004 <100.0 <100.0 October 2004 <100.0 <100.0 September 2004 <100.0 100.0 August 2004 87.8 100.0 July 2004 92.2 140.0 June 2004 97.8 180.0 May 2004 50.0 100.0 April 2004 60.0 180.0 March 2004 16.0 60.0 February 2004 30.0 80.0 January 2004 <100.0 <100.0 December 2003 368 1800 November 2003 100 100 October 2003 <100.0 <100.0 September 200 3 100 100

N/A = Outfall not operational, ND = Non Detect * NPDES permit requires weekly sampling that is reported on the Discharge Monitoring Report as average

11/3/10 Page 4 of 4 Table 5.4

## Table 5.5 DuPont Washington Works Site APFO and PFOA in Surface Water Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA**(ug/L) OUTLET 001 9/2/2010 15 14 8/5/2010 5.7 5.5 7/8/2010 4.6 4.4 6/3/2010 4.9 4.7 6/3/2010 (dup) 5.1 4.9 5/6/2010 7.6 7.3 4/8/2010 4.7 4.5 3/4/2010 12 12 2/4/2010 7.5 7.2 1/7/2010 46 44 12/3/2009 4.2 4 12/3/2009 (dup) 4.2 4 11/5/2009 2 1.9 10/15/2009 5.9 5.7 9/24/2009 5.2 5 8/19/2009 6.4 6.1 7/22/2009 5 4.8 6/18/2009 14 13 6/18/2009 (dup) 16 15 5/19/2009 19 18 4/23/2009 16 15 3/31/2009 15 14 2/24/2009 31 30 1/30/2009 15 14 12/18/2008 9.7 9.3 11/25/2008 15 14 10/14/2008 18 17 9/23/2008 20 19 8/21/2008 3.2 3.1 7/24/2008 8.4 8.1 6/26/2008 8.1 7.8 5/8/2008 6.5 6.2 4/10/2008 8.7 8.4 3/6/2008 9.5 9.1 3/6/08 (dup) 10 9.6

2/7/2008 8 7.7 1/17/2008 27 26 12/27/2007 3 2.9 11/29/2007 18 17 11/29/07 (dup) 17 16

10/18/2007 5.6 5.4 9/20/2007 7.6 7.3 8/30/2007 5.4 5.2 7/19/2007 20 19 6/29/2007 4.5 4.3 6/29/07 (dup) 5.1 4.9

5/24/2007 26 25 4/26/2007 31 30 3/29/2007 40 38 2/28/2007 11 11 2/28/07 (dup) 14 13

1/18/2007 33 32 Active Sampling Locations

11/3/10 Page 1 of 12 Table 5.5

## Table 5.5 DuPont Washington Works Site APFO and PFOA in Surface Water Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA**(ug/L) Active Sampling Locations

12/20/2006 43 41 12/20/06 (dup) 43 41

11/16/2006 16 15 10/19/2006 24 23 10/19/06 (dup) 24 23

9/21/2006 11 11 8/17/2006 5.2 5 7/20/2006 2.95 2.83 6/15/2006 24.2 23.3 5/31/2006 4.22 4.05 5/31/06 (dup) 4 3.84

1/19/2006 28.1 26.9 3/9/2006 24.3 23.3 2/2/2006 19.8 19 2/2/06 (dup) 18 17.3

1/19/2006 28.1 26.9 12/1/2005 14.2 13.6 11/3/2005 7.43 7.14 10/20/2005 9.82 9.43 9/22/2005 18.4 17.7 9/22/05 (dup) 16.4 15.8

8/31/2005 68.9 66.2 7/20/2005 25.2 24.2 6/24/2005 22.4 21.5 5/26/2005 82.4 79.2 4/25/2005 64.5 62 3/17/2005 82.2 79 2/9/2005 69.1 66.4 2/9/05 (dup) 70.1 67.3

1/25/2005 64.5 62 12/14/2004 5.22 5.01 11/9/2004 4.62 10/25/2004 9.33 9/15/2004 3.98 8/13/2004 18.6 7/13/2004 26.8 6/7/2004 53.4 5/17/2004 45.1 4/26/2004 10.9 4/26/04 (dup) 12

3/11/2004 55.7 2/18/2004 45.1 1/21/2004 39.1 12/7/2003 9.69 11/11/2003 12.2 10/16/2003 10.4 9/17/2003 23.8 8/15/2003 32.2 7/28/2003 11.7 6/13/2003 7.95 5/22/2003 14.9 4/30/2003 14.9

11/3/10 Page 2 of 12 Table 5.5

## Table 5.5 DuPont Washington Works Site APFO and PFOA in Surface Water Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA**(ug/L) Active Sampling Locations

3/31/2003 51.4 2/27/2003 18.9 1/26/2003 3.58 12/9/2002 9.76 11/13/2002 17 10/18/2002 10.5 9/24/2002 2.15 8/27/2002 2.94 7/23/2002 8.63 6/25/2002 17.9 5/20/2002 22.4 4/16/2002 19.7 3/19/2002 21.4 2/5/2002 9.43 1/17/2002 10.9 12/20/2001 3.73 OUTLET 002 9/2/2010 19 18 8/5/2010 16 15 7/8/2010 26 25 6/3/2010 16 15 5/6/2010 0.59 0.57 4/8/2010 9.7 9.3 4/8/2010 (dup) 9.6 9.2 3/4/2010 27 26 2/4/2010 25 24 1/7/2010 22 21 12/3/2009 22 21 11/5/2009 16 15 10/15/2009 29 28 9/24/2009 5.9 5.7 8/19/2009 4.6 4.4 8/19/2009 (dup) 4.9 4.7 7/22/2009 580 560 7/22/2009 (dup) 530 510 6/18/2009 480 460 5/19/2009 76 73 4/23/2009 270 260 4/23/2009 (dup) 250 240 3/31/2009 5.8 5.6 2/24/2009 66 63 2/24/09 (dup) 67 64

1/30/2009 100 100 12/18/2008 120 120 11/25/2008 15 14 10/14/2008 68 65 9/23/2008 19 18 9/23/08 (dup) 18 17

8/21/2008 11 11 7/24/2008 14 13 6/26/2008 7.8 7.5 5/8/2008 10 10 4/10/2008 6.8 6.5

11/3/10 Page 3 of 12 Table 5.5

## Table 5.5 DuPont Washington Works Site APFO and PFOA in Surface Water Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA**(ug/L) Active Sampling Locations

4/10/08 (dup) 6.9 6.6 3/6/2008 16 15 2/7/2008 12 12 1/17/2008 14 13 12/27/2007 16 15 12/27/07 (dup) 16 15

11/29/2007 8.1 7.8 10/18/2007 34 33 10/18/07 (dup) 32 31

9/20/2007 21 20 9/20/07 (dup) 20 19

8/30/2007 3.5 3.4 7/19/2007 10 10 6/29/2007 14 13 5/24/2007 6 5.8 4/26/2007 7.4 7.1 3/29/2007 11 11 2/28/2007 11 11 1/18/2007 15 14 12/20/2006 15 14 11/16/2006 11 11 10/19/2006 9.1 8.7 9/21/2006 12 12 9/21/06 (dup) 13 13

8/17/2006 8.2 7.9 7/20/2006 10.8 10.4 6/15/2006 8.27 7.94 6/15/06 (dup) 7.86 7.55

5/31/2006 6.01 5.77 4/27/2006 13.1 12.6 3/9/2006 8.34 8.01 3/9/2006 (dup) 8.85 8.5 2/2/2006 14.4 13.9 1/19/2006 16 15.4 1/19/2006 (dup) 25.1 24.1 12/1/2005 17.1 16.4 11/3/2005 18.8 18.1 11/3/05 (dup) 20.7 19.9

10/20/2005 101 97.3 9/22/2005 11.5 11 8/31/2005 6.98 6.7 8/31/05 (dup) 7.17 6.89

7/20/2005 9.51 9.13 7/20/05 (dup) 9.12 8.76

6/24/2005 7.51 7.21 5/26/2005 15.3 14.7 5/26/05 (dup) 15.1 14.5

4/20/2005 35.4 34 3/16/2005 18 17.3 2/9/2005 14.5 13.9 1/24/2005 9.89 9.5 12/14/2004 5.76 5.53

11/3/10 Page 4 of 12 Table 5.5

## Table 5.5 DuPont Washington Works Site APFO and PFOA in Surface Water Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA**(ug/L) Active Sampling Locations

11/9/2004 20.7 10/25/2004 61.5 9/14/2004 5.87 9/14/04 (dup) 5.83

8/13/2004 5.75 7/13/2004 4.71 6/8/2004 6.41 6/8/04 (dup) 6.29

5/17/2004 10.3 4/26/2004 10 3/11/2004 14.9 2/18/2004 21.1 2/18/04 (dup) 21

1/21/2004 5.1 1/21/04 (dup) 5.16

12/7/2003 2.9 11/11/2003 5.31 10/16/2003 4.94 9/17/2003 5.38 9/17/03 (dup) 5.65

8/15/2003 3.9 7/28/2003 5.37 7/28/03 (dup) 5.48

6/13/2003 5.11 5/22/2003 4.09 4/30/2003 4.09 3/31/2003 4.11 2/27/2003 4.15 1/26/2003 5.46 12/9/2002 2.37 11/13/2002 4.75 11/13/02 (dup) 5.28

10/18/2002 3.49 9/24/2002 2.14 8/27/2002 2.56 8/27/02 (dup) 2.51

7/23/2002 2.29 6/25/2002 3.86 6/25/02 (dup) 3.81

5/20/2002 4.13 4/16/2002 2.45 3/19/2002 5.85 2/5/2002 4.66 1/17/2002 4.23 1/17/02 (dup) 3.99

12/20/2001 1.98 11/26/2001 4.84 10/25/2001 2.8 9/19/2001 0.118 7/11/2001 0.558 6/14/2001 0.594 5/31/2001 0.436

11/3/10 Page 5 of 12 Table 5.5

## Table 5.5 DuPont Washington Works Site APFO and PFOA in Surface Water Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA**(ug/L) Active Sampling Locations

4/11/2001 1.5 3/21/2001 8.54 2/14/2001 1.74 OUTLET 005 9/2/2010 2.6 2.5 9/2/2010 (dup) 2.7 2.6 8/5/2010 4.3 4.1 8/5/2010 (dup) 4.5 4.3 7/8/2010 2.3 2.2 7/8/2010 (dup) 2.2 2.1 6/3/2010 3.1 3 5/6/2010 0.83 0.8 5/6/2010 (dup) 0.85 0.82 4/8/2010 4.6 4.4 3/4/2010 7.4 7.1 2/4/2010 6.8 6.5 2/4/2010 (dup) 7.4 7.1 1/7/2010 3.2 3.1 1/7/2010 (dup) 3.3 3.2 12/3/2009 4.4 4.2 11/5/2009 2.8 2.7 10/15/2009 5.8 5.6 10/15/2009 (dup) 4.8 4.6 9/24/2009 4 3.8 8/19/2009 11 10 7/22/2009 4.8 4.6 6/18/2009 5.3 5.1 5/19/2009 8.8 8.5 4/23/2009 5.2 5 3/31/2009 9.2 8.8 2/24/2009 4.2 4 1/30/2009 5.4 5.2 12/18/2008 3.5 3.4 11/25/2008 1.7 1.6 10/14/2008 5.9 5.7 10/14/08 (dup) 5.1 4.9

9/23/2008 15 14 8/21/2008 3.5 3.4 7/24/2008 9.1 8.7 6/26/2008 4.9 4.7 5/8/2008 6.2 6 4/10/2008 1.4 1.3 3/6/2008 22 21 2/7/2008 10 9.9 1/17/2008 22 21 12/27/2007 4.5 4.3 11/29/2007 16 15 10/18/2007 58 56 9/20/2007 24 23 8/30/2007 2.4 2.3 7/19/2007 51 49 6/29/2007 28 27 5/24/2007 32 31

11/3/10 Page 6 of 12 Table 5.5

## Table 5.5 DuPont Washington Works Site APFO and PFOA in Surface Water Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA**(ug/L) Active Sampling Locations

4/26/2007 3.7 3.6 4/26/07 (dup) 3.6 3.5

3/29/2007 30 29 2/28/2007 64 61 1/18/2007 54 52 1/18/07 (dup) 53 51

12/20/2006 26 25 11/16/2006 23 22 10/19/2006 14 13 9/21/2006 4.7 4.5 8/17/2006 110 110 8/17/06 (dup) 120 120

7/20/2006 17.2 16.5 7/20/06 (dup) 17.7 17

6/15/2006 0.585 0.562 5/31/2006 2.48 2.38 4/27/2006 20.1 19.3 3/9/2006 134 129 2/2/2006 33.9 32.6 1/19/2006 15.4 14.8 12/1/2005 14.4 13.8 11/3/2005 34.1 32.8 10/20/2005 87.4 84 10/20/05 (dup) 86.3 82.9

9/22/2005 41.1 39.5 8/31/2005 23.8 22.9 7/20/2005 2.91 2.79 6/24/2005 12.9 12.4 6/24/05 (dup) 12.7 12.2

5/24/2005 34.3 32.9 4/20/2005 12.4 11.9 3/16/2005 131 126 3/16/05 (dup) 138 133 2/9/2005 24.2 23.2 1/24/2005 45.9 44.1 1/24/05 (dup) 45.7 43.9

12/14/2004 233 224 12/14/04 (dup) 261 251 11/9/2004 29.2 10/25/2004 56.8 10/25/04 (dup) 53.7

9/14/2004 113 8/13/2004 88.2 8/13/04 (dup) 87

7/13/2004 34.5 6/8/2004 68 5/17/2004 37.5 5/17/04 (dup) 37.3

4/26/2004 1.97 3/11/2004 19.2 2/18/2004 48.2 1/21/2004 173

11/3/10 Page 7 of 12 Table 5.5

## Table 5.5 DuPont Washington Works Site APFO and PFOA in Surface Water Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA**(ug/L) Active Sampling Locations

12/7/2003 25.6 11/11/2003 28.4 11/11/03 (dup) 34.4

10/16/2003 36.6 10/16/03 (dup) 35.4

9/17/2003 21 8/15/2003 13.7 8/15/03 (dup) 13.5

7/28/2003 59.1 6/13/2003 247 6/13/03 (dup) 237

5/22/2003 15.9 4/30/2003 15.9 4/30/03 (dup) 16.7

3/31/2003 42.1 3/31/03 (dup) 43.1

2/27/2003 46.4 2/27/03 (dup) 46.2

1/26/2003 33.4 12/9/2002 6.39 12/9/02 (dup) 6.62

11/13/2002 18.1 10/18/2002 12.1 10/17/2002 18 10/16/2002 141 9/24/2002 4.64 9/24/02 (dup) 5.02

8/27/2002 12.4 7/23/2002 19.2 7/12/2002 12.5 7/11/2002 239 7/10/2002 37.8 7/1/2002 13.6 6/27/2002 79.3 6/26/2002 47.7 6/25/2002 17.9 6/24/2002 26.7 5/20/2002 98.6 5/17/2002 65.7 4/16/2002 3.8 3/19/2002 9.26 2/5/2002 141 1/17/2002 137 12/20/2001 31.4 12/20/01(dup) 35.3

11/26/2001 915 10/25/2001 62.6 9/19/2001 2.86 8/30/2001 2.16 7/11/2001 120 6/14/2001 7.4 5/31/2001 1.43

11/3/10 Page 8 of 12 Table 5.5

## Table 5.5 DuPont Washington Works Site APFO and PFOA in Surface Water Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA**(ug/L) Active Sampling Locations

4/11/2001 4.31 3/21/2001 199 2/14/2001 153 OUTLET 105 9/2/2010 16 15 8/5/2010 17 16 7/8/2010 61 59 6/3/2010 17 16 5/6/2010 9.6 9.2 4/8/2010 14 13 3/4/2010 30 29 3/4/2010 (dup) 30 29 2/4/2010 29 28 1/7/2010 15 14 12/3/2009 24 23 11/5/2009 16 15 11/5/2009 (dup) 16 15 10/15/2009 29 28 9/24/2009 37 36 9/24/09 (dup) 37 36

8/19/2009 42 40 7/22/2009 19 18 6/18/2009 31 30 5/19/2009 26 25 5/19/2009 (dup) 26 25 4/23/2009 9.6 9.2 3/31/2009 41 39 3/31/2009 (dup) 41 39 2/24/2009 18 17 1/30/2009 18 17 1/30/09 (dup) 17 16

12/18/2008 18 17 12/18/08 (dup) 20 19

11/25/2008 10 10 11/25/08 (dup) 11 11

10/14/2008 17 16 9/23/2008 23 22 8/21/2008 9.8 9.4 8/21/08 (dup) 9.9 9.5

7/24/2008 14 13 7/24/08 (dup) 15 14

6/26/2008 20 19 6/26/08 (dup) 19 18 5/8/2008 1.7 1.6 5/8/08 (dup) 2 1.9

4/10/2008 4.6 4.4 3/6/2008 14 13 2/7/2008 24 23 2/7/08 (dup) 24 23

1/17/2008 12 12 1/17/08 (dup) 12 12

12/27/2007 9.5 9.1 11/29/2007 24 23

11/3/10 Page 9 of 12 Table 5.5

## Table 5.5 DuPont Washington Works Site APFO and PFOA in Surface Water Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA**(ug/L) Active Sampling Locations

10/18/2007 14 13 9/20/2007 6.7 6.4 8/30/2007 9.7 9.3 8/30/07 (dup) 10 10

7/19/2007 19 18 7/19/07 (dup) 18 17

6/29/2007 17 16 5/24/2007 14 13 5/24/07 (dup) 12 12

4/26/2007 20 19 3/29/2007 22 21 3/29/07 (dup) 23 22

2/28/2007 18 17 1/18/2007 32 31 12/20/2006 36 35 11/16/2006 30 29 11/16/06 (dup) 31 30

10/19/2006 39 37 9/21/2006 37 36 8/17/2006 46 45 7/20/2006 14.1 13.5 6/15/2006 4.71 4.52 5/31/2006 20.7 19.9 4/27/2006 44.5 42.8 4/27/06 (dup) 45.9 44.1 3/9/2006 34.8 33.4 2/2/2006 21.3 20.5 1/19/2006 22.3 21.4 12/1/2005 26.1 25.1 12/1/2005 (dup) 27.2 26.1 11/3/2005 58.6 56.3 10/20/2005 21.9 21 9/22/2005 31.1 29.9 8/31/2005 19.4 18.6 7/20/2005 12.7 12.2 6/24/2005 10.6 10.2 5/24/2005 35.5 34.1 4/25/2005 28.7 27.6 4/25/05 (dup) 27.7 26.6

3/16/2005 10.3 9.91 2/9/2005 17.4 16.7 1/24/2005 11.3 10.8 12/14/2004 15.0 14.4 11/9/2004 6.39 11/9/04 (dup) 6.67

10/25/2004 7.04 9/14/2004 5.74 8/13/2004 27 7/13/2004 10 7/13/04 (dup) 10.4 6/8/2004 15.1 5/17/2004 7.27

11/3/10 Page 10 of 12 Table 5.5

## Table 5.5 DuPont Washington Works Site APFO and PFOA in Surface Water Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA**(ug/L) Active Sampling Locations

4/26/2004 3.63 3/11/2004 14 3/11/04 (dup) 13.5

2/18/2004 50.1 1/21/2004 33.9 12/7/2003 9.81 12/7/03 (dup) 10.3

11/11/2003 14.6 10/16/2003 8.88 9/17/2003 14.4 8/15/2003 3.82 7/28/2003 15.7 6/13/2003 29.3 5/22/2003 44.6 4/30/2003 44.9 3/31/2003 9.25 2/27/2003 17 1/26/2003 16.9 12/9/2002 6.07 11/13/2002 10.5 10/18/2002 54.6 9/24/2002 3.69 8/27/2002 6.73 7/23/2002 34.7 6/25/2002 3.86 5/20/2002 6.27 5/20/02 (dup) 5.16

4/16/2002 15.9 3/19/2002 13.2 2/5/2002 14.6 1/17/2002 7.53 12/20/2001 9.79

11/3/10 Page 11 of 12 Table 5.5

### Table 5.5 DuPont Washington Works Site APFO and PFOA in Surface Water Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA**(ug/L) OUTLET 003 8/15/2003 0.352 7/28/2003 1.1 6/13/2003 0.529 5/22/2003 0.49 5/22/03 (dup) 0.496

4/30/2003 1.23 3/31/2003 0.43 2/27/2003 1.06 1/26/2003 0.75 1/26/03 (dup) 0.842

12/9/2002 0.68 11/13/2002 1.24 10/18/2002 0.87 9/24/2002 0.317 8/27/2002 0.268 7/23/2002 0.291 6/25/2002 0.175 5/20/2002 0.503 4/16/2002 2.76 3/19/2002 2.91 3/19/02 (dup) 2.81

2/5/2002 1.33 1/17/2002 0.956 1/17/02 (dup) 3.99 12/20/2001 0.713 OUTLET 007 8/15/2003 0.496 7/28/2003 0.973 6/13/2003 1.55 5/22/2003 0.206 4/30/2003 0.486 3/31/2003 0.897 2/27/2003 1.1 1/26/2003 5.77 12/9/2002 0.263 11/13/2002 8.56 10/18/2002 0.251 10/18/02 (dup) 0.209

9/24/2002 NQ (<0.05) 8/27/2002 0.207 7/23/2002 0.597 7/23/02 (dup) 0.544

6/25/2002 0.284 5/20/2002 0.49 4/16/2002 0.567 4/16/02 (dup) 0.57

3/19/2002 0.483 2/5/2002 0.32 2/5/02(dup) 0.339 1/17/2002 0.871 12/20/2001 1.99 RIVER BELOW 005 6/14/2001 0.034 J RIVER BELOW PAGES RUN 6/14/2001 0.075 J

J = estimated value (below laboratory quantification limit)

and below the limit of * APFO is also known as C-8 or FC-143. **Both APFO and PFOA are reported starting with analyses performed after December 1, 2004. Note: Analytical method changed as of November 2001. NQ = Not Quantifiable. Detected at a concentration above the LOD Historic Sampling Locations

11/3/10 Page 12 of 12 Table 5.5

### Table 5.6 DuPont Washington Works Site APFO and PFOA in Groundwater Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA**(ug/L) Gallery Well (L04-PW01) 9/2/2010 2.6 2.5 7/8/2010 8.5 8.2 6/10/2010 8.7 8.4 2/25/2010 7.9 7.6 11/17/2009 69 66 8/31/2009 88 85 5/19/09 83 80 2/24/09 42 40 11/18/2008 32 31

7/16/2008 33 32

4/1/2008 45 43 1/8/2008 24 23 11/13/2007 17 16

7/24/2007 14 13 4/17/2007 9.3 8.9 1/16/2007 2.9 2.8 9/19/2006 2.2 2.1

6/6/2006 8.44 8.11 3/7/2006 17.1 16.4 2/2/2006 24.7 23.7 ***12/19/2005 12 11.5

***9/29/2005 1.46 1.4 ***6/24/2005 0.735 0.706 3/21/2005 0.771 0.74 12/8/2004 2.15 2.06 9/28/2004 0.636

8/5/2004 12 5/11/2004 15.2 2/20/2004 24.1 11/11/2003 14.7

8/11/2003 10.1 5/22/2003 24.8 3/10/2003 19.8 10/25/2002 14.3

8/13/2002 3.06 5/21/2002 15.1 4/18/2002 16.1 3/21/2002 29.9

2/7/2002 23.5 1/15/2002 30.9 10/25/2001 20.7

7/11/2001 0.202 4/11/2001 3.99 11/20/2000 13.8

2/7/1999 5.89 11/18/1998 7.9 J 11/18/98 (dup) 3.9 J Ranney Well (V05-PW01) 9/2/2010 110 110 7/8/2010 94 90 6/10/2010 69 66 2/25/2010 5.1 4.9 11/17/2009 62 60 8/31/2009 0.69 0.66 5/19/09 8.6 8.3 2/24/09 0.42 0.4 11/18/2008 77 74

7/16/2008 91 87

4/1/2008 71 68 1/8/2008 77 74 11/13/2007 75 72

7/24/2007 77 74 Active Sampling Locations

11/3/10 Page 1 of 9 Table 5.6

### Table 5.6 DuPont Washington Works Site APFO and PFOA in Groundwater Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA**(ug/L) Active Sampling Locations

4/17/2007 100 100 1/16/2007 93 89 9/19/2006 69 66

6/6/2006 84.8 81.5 3/7/2006 111 107 12/19/2005 26.2 25.2

9/29/2005 123 118 6/24/2005 107 103 3/21/2005 120 115 12/7/2004 74.9 71.9 9/28/2004 100

8/5/2004 92.0 5/11/2004 60 2/20/2004 67.7 11/11/2003 57.3

8/11/2003 36.3 5/22/2003 51.1 3/10/2003 42.5 10/25/2002 51.2

8/13/2002 34.8 5/21/2002 35.8 4/18/2002 37.6 3/21/2002 40.9

2/7/2002 25.1 1/15/2002 29 10/25/2001 38.9

7/11/2001 11.4 4/11/2001 5.48 11/20/2000 13.7

2/7/1999 12.4 2/7/99 (dup) 3.95

11/18/1998 0.66 L West Field Well Header 1 9/2/2010 9.7 9.3 7/8/2010 8.9 8.5 6/10/2010 9.3 8.9 2/25/2010 8.2 7.9 11/17/2009 9.2 8.8 8/31/2009 9.8 9.4 5/19/09 8 7.7 2/24/09 7.4 7.1 11/18/2008 7.3 7

7/16/2008 9.7 9.3

4/1/2008 6.5 6.2 1/8/2008 8.1 7.8 11/13/2007 10 9.6

7/24/2007 6.9 6.6 4/17/2007 7.9 7.6 1/16/2007 8.4 8.1 9/19/2006 10 9.8

6/6/2006 7.28 6.99 3/7/2006 10.2 9.82 12/19/2005 13.3 12.8

9/29/2005 9.73 9.35 6/24/2005 8.88 8.53 3/21/2005 8.58 8.24 12/8/2004 16.8 16.1 9/28/2004 13.7

8/5/2004 13.5 5/11/2004 10.2

11/3/10 Page 2 of 9 Table 5.6

### Table 5.6 DuPont Washington Works Site APFO and PFOA in Groundwater Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA**(ug/L) Active Sampling Locations

2/20/2004 10.9 11/11/2003 10.3

8/11/2003 7.14 5/23/2003 8.37 3/10/2003 7.12 10/25/2002 10.3

8/13/2002 6.41 5/21/2002 7.09 4/18/2002 6.69 3/21/2002 7.72

2/7/2002 5.77 1/15/2002 6.52 7/11/2001 2.31 4/11/2001 1.58 9/14/2000 0.819

6/3/1999 1.63 6/2/1998 16 5/29/1997 7.9 4/11/1996 3.7 2/16/1994 2

11/3/10 Page 3 of 9 Table 5.6

### Table 5.6 DuPont Washington Works Site APFO and PFOA in Groundwater Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA**(ug/L) AA04-MW01 2/6/1999 5.43 11/12/1998 <0.1 11/12/98 (dup) 0.42 AA05-MW01 2/4/1999 1.46 11/11/1998 0.77 AB07-MW02 2/4/1999 0.535 11/16/1998 <0.2 I AC07-MW02 2/4/1999 0.356 11/16/1998 0.79 ADPMW 1 12/6/1991 7800 ADPMW 2 12/6/1991 25 ADPMW 3 12/6/1991 20000 AE11-MW01 8/26/2003 3.85 5/21/2003 2.96 2/25/2003 1.37 10/16/2002 1.74

9/4/2002 1.92 5/23/2002 1.25 4/29/2002 1.22 3/26/2002 2.82 2/22/2002 1.45 1/28/2002 1.2

2/2/1999 0.69 L 11/10/1998 0.41 AJ06-MW02 8/25/2003 0.0821 5/22/2003 0.377 2/25/2003 0.099 10/16/2002 0.133 AM07-PW01 6/6/2006 0.538 0.517 3/7/2006 0.637 0.612 12/19/2005 0.559 0.537

9/29/2005 1 0.962 6/24/2005 0.967 0.929 3/21/2005 1.31 1.26 12/7/2004 2.61 2.51 9/26/2004 9.06 5/11/2004 1.27 2/17/2004 1.04 11/11/2003 0.511

8/11/2003 1.16 5/22/2003 0.377

3/8/2003 NQ (< 0.05) 10/22/2002 0.269

8/26/2002 0.335 5/17/2002 0.247 4/16/2002 0.159 3/21/2002 0.171 2/14/2002 0.129 1/22/2002 0.131 11/20/2000 0.24

8/16/2000 0.071 J 5/12/1999 0.578

2/3/1999 0.082 B 11/18/1998 1.9 L

6/19/1998 0.4

6/2/1997 0.79 4/2/1996 0.48 12/20/1991 0.4 AO08-PW01 6/6/2006 0.969 0.931 3/7/2006 1.47 1.41 12/19/200 5 0.86 0.826 Historic Sampling Locations

11/3/10 Page 4 of 9 Table 5.6

### Table 5.6 DuPont Washington Works Site APFO and PFOA in Groundwater Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA**(ug/L) Historic Sampling Locations

9/29/2005 1.25 1.2 6/24/2005 1.09 1.05 3/21/2005 1.29 1.24 12/7/2004 2.12 2.04 9/26/2004 4.99 5/11/2004 1.01 2/17/2004 0.928 11/11/2003 0.384

8/11/2003 0.802 5/22/2003 0.736

3/8/2003 0.308 10/22/2002 0.415

8/26/2002 0.42 5/17/2002 0.499 4/16/2002 0.497 3/21/2002 0.568 2/14/2002 0.439 1/22/2002 0.355 11/20/2000 0.4 11/20/00 (dup) 0.26 8/15/2000 0.167 5/12/1999 0.307 6/19/1998 1

6/2/1997 0.55 4/2/1996 0.52 AQ09-PW01 10/11/2001 0.484 5/12/1999 1.45 AX13-PW01 6/7/2006 0.941 0.904 3/7/2006 0.955 0.917 12/19/2005 0.583 0.56

9/29/2005 0.806 0.774 6/24/2005 0.834 0.802 3/21/2005 1.63 1.57 12/7/2004 Not operating 9/28/2004 Not operating 5/11/2004 1.9 2/17/2004 2.53 11/11/2003 1.92

8/11/2003 1.51 5/22/2003 1.97

3/8/2003 1.07 10/22/2002 0.721

8/26/2002 0.834 5/17/2002 0.911 4/16/2002 1.42 3/21/2002 1.22 2/14/2002 1.03 BGMW2 12/13/1991 2.3 BGMW3 12/13/1991 4 12/13/91 (dup) 3.6 BGMW5 12/11/1991 5.5 BLDG 1 MAIN 10/11/2001 0.485 10/11/01 (dup) 0.467 8/15/2000 0.589 BLDG 231 10/11/2001 0.455 5/12/1999 0.306 5/12/99 (dup) 0.269 BLDG 293 10/11/2001 0.407 5/12/1999 0.496 BLDG 5 5/12/1999 0.213 D08-MW01 8/26/2003 0.0764

11/3/10 Page 5 of 9 Table 5.6

### Table 5.6 DuPont Washington Works Site APFO and PFOA in Groundwater Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA**(ug/L) Historic Sampling Locations

5/21/2003 0.846 5/21/03 (dup) 0.841 2/25/2003 3.72 10/16/2002 0.126

9/4/2002 0.117 5/23/2002 0.551 4/29/2002 0.424 3/26/2002 0.262 2/22/2002 1.27 1/28/2002 0.582 E13-MW01 8/26/2003 2.88 5/21/2003 3.67 2/25/2003 3.15 10/16/2002 3.43

9/4/2002 2.39 5/23/2002 2.47 4/29/2002 2.44 3/26/2002 1.62 2/22/2002 2.32 1/28/2002 2.11 5/12/1999 0.882

2/2/1999 0.59 L 11/11/1998 2 F06-MW01 2/2/1999 0.35 L 11/11/1998 <0.1 G17-MW01 5/12/1999 2.47 2/2/1999 2.11 L 11/11/1998 13 K16-PW01 6/6/2006 11.3 10.9 3/7/2006 15.6 15 ***12/19/2005 see L04-PW01 see L04-PW01

***9/29/2005 see L04-PW01 see L04-PW01 ***6/24/2005 see L04-PW01 see L04-PW01 3/21/2005 12.2 11.7 12/7/2004 16.2 15.6 9/28/2004 13.7 9/27/2004 25.8 5/11/2004 18.3 2/18/2004 9.41 11/11/2003 18.2

8/11/2003 11.9 5/22/2003 16

3/8/2003 8.93 10/22/2002 16.2

8/26/2002 9.71 5/17/2002 12.4 4/16/2002 13.2 3/21/2002 17.2 2/14/2002 12 1/22/2002 10.5 11/20/2000 7.5

2/9/1999 16.2 11/18/1998 0.46 L L06-MW01 2/5/1999 4.91 11/13/1998 870 L17-PW01 9/14/2000 0.819 6/3/1999 1.63 2/9/1999 2.76 11/18/1998 0.33

6/2/1998 16 5/29/1997 7.9

11/3/10 Page 6 of 9 Table 5.6

### Table 5.6 DuPont Washington Works Site APFO and PFOA in Groundwater Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA**(ug/L) Historic Sampling Locations

4/11/1996 3.7 2/16/1994 2 M04-MW02 2/7/1999 17 11/12/1998 0.2 M16-MW01 2/3/1999 3.66 L 11/10/1998 0.86 MW-AJP 4/18/1996 <0.4 MW-MGM 4/18/1996 0.69 MW-TWW 4/18/1996 0.85 MWBG 4/2/1996 <0.1 N04-MW02 1/28/2002 689 1/25/2001 698 1/25/01 (dup) 696 2/7/1999 329 11/12/1998 380 N04-MW03 8/25/2003 208 5/21/2003 268 2/26/2003 244 10/16/2002 21.2 N05-MW01 2/5/1999 815 11/13/1998 13 N13-MW01 8/26/2003 Insufficient Flow 5/22/2003 Insufficient Flow 2/25/2003 Insufficient Flow 10/16/2002 Insufficient Flow

9/4/2002 Insufficient Flow 5/23/2002 Insufficient Flow 4/29/2002 Insufficient Flow 3/28/2002 Insufficient Flow 2/25/2002 57.8

2/2/1999 29.6L 11/11/1998 <0.1 P04-MW02 8/26/2003 35100 5/21/2003 45600 2/26/2003 36900 10/16/2002 46600 10/16/02 (dup) 48300 9/4/2002 34400 5/23/2002 42400 4/29/2002 36500 3/26/2002 32300 2/25/2002 26800 1/28/2002 32600 1/25/2001 12600

2/6/1999 13600 11/12/1998 8300 P05-MW02 2/5/1999 434 11/13/1998 1200 P06-MW02 2/5/1999 414 11/13/1998 31 P08-MW01 8/26/2003 Insufficient Flow 5/22/2003 Insufficient Flow 2/25/2003 Insufficient Flow 10/16/2002 120

9/4/2002 Insufficient Flow 5/23/2002 Insufficient Flow 4/29/2002 Insufficient Flow 3/28/2002 Pump problems-no sample 2/25/2002 20.7

2/4/1999 43.4 11/13/199 8 36

11/3/10 Page 7 of 9 Table 5.6

### Table 5.6 DuPont Washington Works Site APFO and PFOA in Groundwater Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA**(ug/L) Historic Sampling Locations

Q04-MW02 8/26/2003 761 5/21/2003 831 2/26/2003 566 10/16/2002 7720

9/4/2002 32.2 5/23/2002 1480 4/29/2002 1210 3/26/2002 2070 2/25/2002 1590 1/28/2002 1480

2/4/1999 994 11/13/1998 660 R04-MW02 8/26/2003 66700 8/26/03 (dup) 70000 5/21/2003 67500 2/26/2003 322000 2/26/03 (dup) 289000

10/16/2002 84100

9/4/2002 66500 5/23/2002 68100 4/29/2002 56300 3/26/2002 54400 2/25/2002 43600 1/28/2002 47500 1/28/2002 47500 1/25/2001 13800

2/6/1999 9420 11/12/1998 1300 Q05-MW01 11/13/1998 38 RBLMW1 12/5/1991 140 12/5/91 (dup) 140 RBLMW2 12/11/1991 65 12/11/91 (dup) 67 RBLMW3 12/11/1991 7100 RBLMW4 12/5/1991 550 RBLMW5 12/10/1991 1300 RBLMW6 11/21/1991 3300 RBLMW7 11/21/1991 46 11/21/91 (dup) 52 RBLMW8 12/10/1991 2.4 RBLMW9 12/10/1991 3.4 RBLMW10 11/20/1991 14 RBLMW11 11/20/1991 47 RBLMW12 12/10/1991 4.6 S05-MW02 2/5/1999 174 11/13/1998 690 T13-MW01 2/3/1999 0.64 L 2/3/99 (dup) 1.30 L

11/17/1998 <0.1 R U04-MW01 2/6/1999 4.2 11/12/1998 1.6 U16-MW01 5/11/2000 4.7 5/20/1999 2 6/19/1998 11 V06-MW01 2/4/1999 1.91 11/16/1998 1.7 W05-MW01 2/6/1999 0.729 11/17/1998 0.31 Y14-MW01 8/26/2003 16.7 5/22/2003 21.6 2/25/2003 15.7

11/3/10 Page 8 of 9 Table 5.6

### Table 5.6 DuPont Washington Works Site APFO and PFOA in Groundwater Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA**(ug/L) Historic Sampling Locations

10/16/2002 18.2

9/4/2002 18.4 5/23/2002 15.3 4/29/2002 13.9 3/28/2002 15.5 2/22/2002 10.9 1/28/2002 12.7

2/2/1999 4.95 L 11/10/1998 12 Y14-MW02 8//25/03 NQ (< 0.05) 5/22/2003 0.0506 2/25/2003 NQ (< 0.05) 10/16/2002 NQ (< 0.05) Z06-MW02 2/4/1999 0.803 11/16/1998 4.5 Z07-MW01 2/4/1999 2.05 11/16/1998 3.8 Z09-MW01 2/6/1999 2.74 11/17/199 8 <0.1 R

J = estimated value (below laboratory quantification limit) L = possible low bias result (relative to QA/QC) B= compound detected in QC blank R = unusable data result (relative to QA/QC) Note: Analytical method changed as of November 2001. *APFO is also known as C-8 or FC-143. **Both APFO and PFOA are reported starting with analyses performed after December 1, 2004 ***New personnel conducted sampling starting with 2Q05 event and subsequently determined that the incorrect sampling point was sampled from 2Q05 through 4Q05.

11/3/10 Page 9 of 9 Table 5.6

### Table 5.7 Local Landfill APFO and PFOA in Surface Water Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA** (ug/L) OUTLET 004 9/7/2010 Insufficient Flow Insufficient Flow (OUTFALL 004 New) 8/3/2010 Insufficient Flow Insufficient Flow 7/13/2010 2.4 2.3 6/28/2010 3.6 3.4 5/3/2010 2.4 2.3 12/9/2009 Insufficient Flow Insufficient Flow 12/3/2009 Insufficient Flow Insufficient Flow 11/19/2009 Insufficient Flow Insufficient Flow 11/12/2009 Insufficient Flow Insufficient Flow 10/23/2009 Insufficient Flow Insufficient Flow 9/26/2009 Insufficient Flow Insufficient Flow 8/19/2009 Insufficient Flow Insufficient Flow 7/31/2009 1.6 1.5

6/4/09 0.54 0.52 5/4/09 2.5 2.4 3/11/2009 Insufficient Flow Insufficient Flow 2/10/2009 Insufficient Flow Insufficient Flow 1/7/2009 2.6 2.5 11/24/2008 0.38 0.36

9/4/2008 Insufficient Flow Insufficient Flow 8/27/2008 0.14 0.13 7/2/2008 Insufficient Flow Insufficient Flow 6/5/2008 8.3 8 5/9/2008 11 11 4/7/2008 10 10 3/5/2008 9 8.7 2/5/2008 7.9 7.6 1/8/2008 12 12 12/10/2007 7.2 6.9 11/16/2007 16 15 10/11/2007 Insufficient Flow Insufficient Flow 9/27/2007 Insufficient Flow Insufficient Flow 9/26/2007 Insufficient Flow Insufficient Flow 8/3/2007 Insufficient Flow Insufficient Flow 7/3/2007 15 14 6/6/2007 15 14 5/15/2007 17 16 4/3/2007 15 14 3/6/2007 11 11 2/21/2007 11 11 1/3/2007 12 12 12/7/2006 9.7 9.3 11/13/2006 10 9.6 10/5/2006 6 5.8 9/7/2006 9.6 9.2 8/31/2006 10 9.7 7/12/2006 9.57 9.19 6/8/2006 14 13.4 5/5/2006 15.2 14.6 4/14/2006 18.1 17.4 3/11/2006 14.4 13.8 2/14/2006 12.4 11.9 1/30/2006 9.58 9.2 Active Sampling Locations

11/3/10 Page 1 of 10 Table 5.7

### Table 5.7 Local Landfill APFO and PFOA in Surface Water Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA** (ug/L) Active Sampling Locations

12/14/2005 9.45 9.08 11/9/2005 9.89 9.5 10/24/2005 12.1 11.6 9/21/2005 Insufficient Flow Insufficient Flow 8/18/2005 15.1 14.5 7/26/2005 11.2 10.8 6/16/2005 12.4 11.9 5/20/2005 15.8 15.2 4/27/2005 16.3 15.7 3/30/2005 16 15.4 2/7/2005 13.2 12.7 1/10/2005 12.7 12.2 12/10/2004 11.6 11.1 11/22/2004 18.8 10/15/2004 18.9 9/20/2004 16 8/23/2004 10.2 7/20/2004 13.8 6/23/2004 14.9 5/19/2004 13.5 4/5/2004 15.5 3/15/2004 15.8 2/10/2004 13.9 1/21/2004 12.7 12/5/2003 7.34 11/13/2003 21.8 10/21/2003 9.86 9/17/2003 12.3 8/13/2003 10.9 7/24/2003 9.75 6/13/2003 13.4 5/21/2003 19.3 4/30/2003 18.1 3/29/2003 15.9 2/28/2003 Insufficient Flow 1/31/2003 Insufficient Flow 12/13/2002 10.7 11/30/2002 Insufficient Flow 10/31/2002 Insufficient Flow 9/30/2002 Insufficient Flow 8/26/2002 Insufficient Flow 7/1/2002 11.2 6/13/2002 9.29 5/21/2002 Insufficient Flow 4/27/2002 14.5 3/26/2002 14.6 OUTLET 005 9/7/2010 Insufficient Flow Insufficient Flow (OUTFALL 005 New) 8/3/2010 Insufficient Flow Insufficient Flow 7/13/2010 7.3 7 6/9/2010 3 2.8 5/3/2010 4 3.8 4/8/2010 20 19 3/10/2010 14 13

11/3/10 Page 2 of 10 Table 5.7

### Table 5.7 Local Landfill APFO and PFOA in Surface Water Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA** (ug/L) Active Sampling Locations

2/19/2010 7.5 7.2 1/18/2010 5.5 5.2 12/3/2009 4.9 4.7 11/19/2009 Insufficient Flow Insufficient Flow 11/12/2009 Insufficient Flow Insufficient Flow 10/23/2009 4.3 4.1 9/26/2009 6 5.8 8/19/2009 Insufficient Flow Insufficient Flow 7/31/2009 2.7 2.6

6/4/09 8 7.7 5/4/09 3.1 3 4/14/09 10 9.7 3/11/2009 16 15 2/10/2009 8.6 8.3 1/6/2009 9.5 9.1 12/10/2008 3.4 3.3 11/15/2008 5.8 5.6

9/4/2008 Insufficient Flow Insufficient Flow 8/27/2008 6 5.8 7/2/2008 Insufficient Flow Insufficient Flow 6/5/2008 5.9 5.7 5/12/2008 6.3 6.1 4/28/2008 21 20 3/5/2008 8.2 7.9 2/5/2008 3 2.9 1/11/2008 4.3 4.1 12/10/2007 0.27 0.26 11/26/2007 1.8 1.7 10/11/2007 Insufficient Flow Insufficient Flow 9/27/2007 Insufficient Flow Insufficient Flow 9/26/2007 Insufficient Flow Insufficient Flow 9/14/2007 Insufficient Flow Insufficient Flow 8/3/2007 Insufficient Flow Insufficient Flow 7/3/2007 Insufficient Flow Insufficient Flow 6/19/2007 17 16 5/16/2007 Insufficient Flow Insufficient Flow 4/12/2007 11 11 3/9/2007 10 10 2/21/2007 7 6.7 1/5/2007 10 9.8 12/22/2006 9.8 9.5 11/16/2006 4 3.8 11/13/2006 Insufficient Flow Insufficient Flow 11/3/2006 Insufficient Flow Insufficient Flow 10/5/2006 5.8 5.6 9/13/2006 3.1 3 8/31/2006 Insufficient Flow Insufficient Flow 8/24/2006 Insufficient Flow Insufficient Flow 7/12/2006 Insufficient Flow Insufficient Flow 6/27/2006 Insufficient Flow Insufficient Flow 6/8/2006 Insufficient Flow Insufficient Flow 5/11/2006 6.93 6.65 4/14/2006 15.4 14.8

11/3/10 Page 3 of 10 Table 5.7

### Table 5.7 Local Landfill APFO and PFOA in Surface Water Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA** (ug/L) Active Sampling Locations

3/11/2006 17.6 16.9 2/16/2006 Insufficient Flow Insufficient Flow 2/14/2006 frozen frozen 1/30/2006 7.44 7.15 12/29/2005 6.7 6.44 12/14/2005 Insufficient Flow Insufficient Flow 11/9/2005 Insufficient Flow Insufficient Flow 10/24/2005 Insufficient Flow Insufficient Flow 9/21/2005 Insufficient Flow Insufficient Flow 8/18/2005 Insufficient Flow Insufficient Flow 7/26/2005 Insufficient Flow Insufficient Flow 6/16/2005 Insufficient Flow Insufficient Flow 5/20/2005 11.1 10.7 4/27/2005 14.9 14.3 3/29/2005 12.7 12.2 2/7/2005 15.9 15.3 1/10/2005 12.3 11.8 12/10/2004 6.44 6.18 11/19/2004 5.56 10/15/2004 Insufficient Flow 9/20/2004 Insufficient Flow 7/20/2004 Insufficient Flow 6/23/2004 Insufficient Flow 5/19/2004 15.2 4/5/2004 20 3/15/2004 23.1 2/24/2004 22.5 1/22/2004 Insufficient Flow 12/5/2003 9.32 11/13/2003 42.1 10/21/2003 31.9 9/17/2003 Insufficient Flow 8/13/2003 Insufficient Flow 7/24/2003 7.93 6/13/2003 20.9 5/21/2003 21 4/30/2003 12.5 3/31/2002 Insufficient Flow 2/28/2003 Insufficient Flow 1/31/2003 Insufficient Flow 12/13/2002 9.51 11/30/2002 Insufficient Flow 10/31/2002 Insufficient Flow 9/30/2002 Insufficient Flow 8/26/2002 Insufficient Flow 7/1/2002 Insufficient Flow 6/13/2002 Insufficient Flow 5/21/2002 Insufficient Flow 4/27/2002 34.3 3/26/2002 16 SS1 (OUTFALL 005 (Old)/SS1) 9/7/2010 Insufficient Flow Insufficient Flow 8/3/2010 Insufficient Flow Insufficient Flow 7/13/2010 25 24

11/3/10 Page 4 of 10 Table 5.7

### Table 5.7 Local Landfill APFO and PFOA in Surface Water Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA** (ug/L) Active Sampling Locations

6/9/2010 21 20 5/3/2010 18 17 4/8/2010 34 33 3/10/2010 37 36 2/19/2010 36 35 1/18/2010 21 20 12/3/2009 32 30 11/19/2009 Insufficient Flow Insufficient Flow 11/12/2009 Insufficient Flow Insufficient Flow 10/23/2009 Insufficient Flow Insufficient Flow 9/26/2009 29 28 8/19/2009 Insufficient Flow Insufficient Flow 7/31/2009 20 19

6/4/09 33 32 5/4/09 20 19 4/14/09 29 28 3/11/2009 36 35 2/10/2009 27 26 1/6/2009 40 38 12/10/2008 35 34

9/4/2008 Insufficient Flow Insufficient Flow 8/27/2008 16 15 7/2/2008 Insufficient Flow Insufficient Flow 6/5/2008 22 21 5/9/2008 30 29 4/7/2008 25 24 3/5/2008 25 24 2/5/2008 26 25 1/8/2008 40 38 12/10/2007 22 21 11/26/2007 27 26 10/11/2007 Insufficient Flow Insufficient Flow 9/27/2007 Insufficient Flow Insufficient Flow 9/26/2007 Insufficient Flow Insufficient Flow 9/14/2007 Insufficient Flow Insufficient Flow 8/3/2007 Insufficient Flow Insufficient Flow 7/3/2007 Insufficient Flow Insufficient Flow 6/19/2007 19 18 6/6/2007 Insufficient Flow Insufficient Flow 5/15/2007 35 34 4/3/2007 32 31 3/6/2007 34 33 2/2/2007 30 29 1/3/2007 37 36 12/7/2006 29 28 11/13/2006 9.6 9.4 10/5/2006 26 25 9/13/2006 24 23 8/31/2006 Insufficient Flow Insufficient Flow 8/24/2006 Insufficient Flow Insufficient Flow 7/12/2006 Insufficient Flow Insufficient Flow 6/8/2006 41.9 40.2 5/5/2006 46.5 44.7

11/3/10 Page 5 of 10 Table 5.7

### Table 5.7 Local Landfill APFO and PFOA in Surface Water Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA** (ug/L) Active Sampling Locations

4/14/2006 47.7 45.8 3/11/2006 51 49 2/14/2006 38.7 37.2 1/30/2006 35.1 33.7 12/16/2005 28.9 27.8 11/9/2005 73.6 69.2 10/24/2005 Insufficient Flow Insufficient Flow 9/21/2005 Insufficient Flow Insufficient Flow 8/18/2005 Insufficient Flow Insufficient Flow 7/26/2005 Insufficient Flow Insufficient Flow 6/16/2005 36.1 34.6 5/20/2005 47.3 45.4 4/27/2005 34.7 33.3 3/20/2005 40.1 38.5 2/7/2005 32.4 31.1 1/10/2005 33.6 32.3 12/10/2004 28.6 27.5 11/22/2004 56.7 10/15/2004 55.7 9/20/2004 49.2 7/20/2004 46.4 6/23/2004 45.4 5/19/2004 36.4 4/5/2004 61.4 3/15/2004 42.5 2/10/2004 35.8 1/21/2004 33.6 12/5/2003 21.8 11/13/2003 42.1 10/21/2003 31.9 9/17/2003 Insufficient Flow 8/13/2003 35 7/24/2003 29.5 6/13/2003 39.2 5/21/2003 47.9 4/30/2003 50.1 3/29/2003 44.9 2/28/2003 Insufficient Flow 1/31/2003 Insufficient Flow 12/13/2002 38.1 11/30/2002 Insufficient Flow 10/31/2002 Insufficient Flow 9/30/2002 Insufficient Flow 8/26/2002 Insufficient Flow 7/1/2002 32.1 6/13/2002 27.3 5/21/2002 Insufficient Flow 4/27/2002 40.9 3/26/2002 39 2/20/2002 46 1/11/2002 51.4 12/13/2001 Insufficient Flow 9/27/2000 13.3

11/3/10 Page 6 of 10 Table 5.7

### Table 5.7 Local Landfill APFO and PFOA in Surface Water Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA** (ug/L) Active Sampling Locations

12/10/1999 34

6/3/1999 6.8 6/2/1998 39 5/29/1997 41 4/2/1996 39 2/16/1994 35 OUTLET 101 (OUTFALL 101) 9/7/2010 100 100 8/3/2010 75 72 7/12/2010 68 65 6/11/2010 51 49 6/11/2010 51 49 5/14/2010 47 45 4/8/2010 53 51 3/5/2010 58 56 2/8/2010 48 46 1/8/2010 55 53 12/8/2009 70 67 11/12/2009 89 85 10/1/2009 100 96 9/8/2009 99 96 8/18/2009 93 89 7/16/2009 100 100

6/3/09 65 62 5/4/09 34 33 4/10/09 76 73 3/4/2009 73 70 2/10/2009 59 57 1/6/2009 100 100 12/2/2008 100 98 11/4/2008 92 88 10/3/2008 98 94 9/4/2008 93 89 8/6/2008 73 70 7/28/2008 71 68 6/5/2008 34 33 5/9/2008 72 69 4/7/2008 50 48 3/5/2008 28 27 2/5/2008 43 41 1/8/2008 57 55 12/10/2007 56 54 11/16/2007 98 94 10/11/2007 140 130 9/14/2007 130 120 8/3/2007 120 120 7/3/2007 93 89 6/6/2007 84 81 5/15/2007 80 77 4/3/2007 61 59 3/9/2007 61 59 2/2/2007 60 58 1/3/2007 67 64 12/7/2006 58 56

11/3/10 Page 7 of 10 Table 5.7

### Table 5.7 Local Landfill APFO and PFOA in Surface Water Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA** (ug/L) Active Sampling Locations

11/3/2006 50 48 10/6/2006 28 27 9/7/2006 94 90 8/18/2006 65 62 7/12/2006 72.3 69.4 6/8/2006 73.3 70.4 5/5/2006 77.5 74.4 4/14/2006 82.1 78.9 3/24/2006 78 74.9 2/14/2006 58.2 55.9 1/30/2006 56.6 54.4 12/14/2005 118 113 11/7/2005 161 155 10/24/2005 121 116 9/21/2005 154 148 8/18/2005 112 108 7/26/2005 92.6 88.9 6/16/2005 101 97.4 5/20/2005 101 97.2 4/27/2005 63.3 60.8 3/30/2005 50.4 48.4 2/7/2005 69 66.3 1/10/2005 41.2 39.6 12/10/2004 60.1 57.7 11/22/2004 119 10/18/2004 155 9/20/2004 54 8/23/2004 100 7/20/2004 113 6/23/2004 94.9 5/19/2004 103 4/5/2004 69.9 3/15/2004 76.8 2/10/2004 62.6 1/22/2004 64 12/5/2003 39 11/13/2003 63.1 10/21/2003 71.9 9/17/2003 96.7 8/13/2003 63.3 7/24/2003 60.4 6/13/2003 59.7 5/21/2003 48.4 4/30/2003 74.1 3/28/2003 45.4 2/26/2003 43.9 1/29/2003 72.3 12/16/2002 49.5 11/19/2002 76.7 10/31/2002 78.6 9/30/2002 115 8/26/2002 70.3 7/1/2002 63

11/3/10 Page 8 of 10 Table 5.7

### Table 5.7 Local Landfill APFO and PFOA in Surface Water Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA** (ug/L) Active Sampling Locations

6/13/2002 38 5/21/2002 40 4/27/2002 48.2 3/25/2002 36.4 2/20/2002 63.1 1/23/2002 81.4 12/13/2001 82.4 9/14/2000 12 6/3/1999 15 6/2/1998 54 LM1 (Inlet 002) 8/3/2010 140 130 1/28/2010 110 110 8/18/2009 150 140 1/6/2009 120 120 8/14/2008 110 110 1/8/2008 115 110 8/3/2007 140 130 4/3/2007 98 94 9/7/2006 150 140 2/14/2006 115 110 10/24/2005 158 152 5/20/2005 133 11/22/2004 182 5/19/2004 105 12/5/2003 56.1 6/13/2003 87.9 5/21/2003 83.2 4/30/2003 98 12/16/2002 81.7 11/21/2002 120

11/3/10 Page 9 of 10 Table 5.7

### Table 5.7 Local Landfill APFO and PFOA in Surface Water Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO (ug/L) PFOA**(ug/L) OUTFALL 004 Old 6/13/2003 14.4 5/21/2003 20.2 4/30/2003 16.8 3/29/2003 14.7 2/28/2003 Insufficient Flow 1/31/2003 Insufficient Flow 12/13/2002 12.5 11/30/2002 Insufficient Flow 10/31/2002 Insufficient Flow 9/30/2002 Insufficient Flow 8/26/2002 Insufficient Flow 7/1/2002 11.6 6/13/2002 10 5/21/2002 Insufficient Flow 4/29/2002 15 3/26/2002 1.54 2/20/2002 10.9 1/24/2002 11.4 12/13/2001 Insufficient Flow 9/27/2000 4.73 12/10/1999 7.1

6/3/1999 3.06 6/2/1998 12 5/29/1997 13 4/2/1996 13 2/16/1994 11 LEACHATE 2/16/1994 31 OUTLET 001 5/29/1997 80 4/2/1996 61 OUTLET 002 5/29/1997 <0.2 4/2/1996 72 OUTLET 003 5/29/1997 23 4/2/1996 20 STREAM 1 5/29/1997 11 4/2/1996 7.2 STREAM 2 9/14/2000 4.12 12/29/1999 10.7

6/2/1998 15 4/2/1996 14

Note: Analytical method changed as of November 2001. *APFO is also known as C-8 or FC-143. **Both APFO and PFOA are reported starting with analyses performed after December 1, 2004 Historic Sampling Locations

11/3/10 Page 10 of 10 Table 5.7

### Table 5.8 Local Landfill APFO and PFOA in Groundwater Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA** (ug/L)

MW4 (LLMW-4) 8/2/2010 97 93 8/2/2010 (dup) 95 91

1/28/2010 91 87 1/28/2010 (dup) 83 80 9/8/2009 97 93 9/8/2009 (dup) 96 92

1/19/2009 90 86 1/19/09 (dup) 87 84

9/23/2008 79 76 9/23/08 (dup) 76 73

4/24/2008 73 70 4/24/08 (dup) 71 68

7/20/2007 73 70 1/9/2007 76 73 7/26/2006 72.5 69.6 7/26/06 (dup) 68.8 66.1

1/12/2006 68.9 66.2 1/12/2006 (dup) 71.8 69

7/18/2005 67.5 64.8 7/18/2005 (dup) 65.5 62.9 1/28/2005 67.4 64.7 1/28/2005 (dup) 63.8 61.3

11/16/2004 103 8/9/2004 91.1 2/13/2004 55.5 7/21/2003 72.9 7/21/03 (dup) 71.6

5/13/2003 65.9 3/4/2003 52.4 10/15/2002 79.6 9/3/2002 63.5 5/20/2002 57.7 3/28/2002 47.2 2/25/2002 50.2 1/27/2002 58.4 12/13/2001 54.6 5/16/2001 1.4 5/11/2000 10 5/19/1999 16.2 5/27/1998 26 4/11/1996 39 MW6 (LLMW-6) 8/2/2010 12 12 1/28/2010 10 9.9 9/9/2009 14 13 1/19/2009 14 13 9/23/2008 12 12 4/24/2008 10 10 7/20/2007 13 13 1/9/2007 14 13 1/9/07 (dup) 15 14 7/26/2006 13.4 12.9 1/12/2006 15.1 14.5 7/18/2005 14.5 13.9 1/28/2005 16.9 16.2 11/16/2004 26 8/9/2004 22.9 2/13/2004 16.4 2/13/04 (dup) 16.2

7/21/2003 17.2 5/13/2003 19.4 3/4/2003 16.1 10/15/2002 19.9 10/15/02 (dup) 17 A-Zone Active Sampling Locations

11/3/10 Page 1 of 4 Table 5.8

### Table 5.8 Local Landfill APFO and PFOA in Groundwater Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA** (ug/L) Active Sampling Locations

9/3/2002 13.7 5/20/2002 18.6 3/28/2002 11.5 2/25/2002 10.1 1/27/2002 12.2 12/13/2001 11.9 5/16/2001 3 5/10/2000 1.42 5/19/1999 1.32 5/27/1998 9 4/11/1996 15 MW9 (LLMW-9) 8/2/2010 0.39 0.37 1/28/2010 0.46 0.44 9/9/2009 0.61 0.59 1/19/2009 0.78 0.75 9/23/2008 0.69 0.66 4/24/2008 0.7 0.67 7/20/2007 0.31 0.3 1/9/2007 0.2 0.19 7/26/2006 0.257 0.247 1/12/2006 0.182 0.175 7/18/2005 0.278 0.267 1/28/2005 0.232 0.223 11/16/2004 0.291 8/9/2004 0.349 2/13/2004 0.0673 7/21/2003 0.063 5/13/2003 0.0657 3/4/2003 NQ (<0.05) 10/15/2002 0.0569 9/3/2002 NQ (<0.05) 5/20/2002 NQ (<0.05) 3/28/2002 NQ (<0.05) 2/25/2002 NQ (<0.05) 1/27/2002 NQ (<0.05) 12/13/2001 ND (<0.01) 5/16/2001 0.039 J 5/10/2000 <0.029 5/20/1999 0.046 J 5/27/1998 <0.1 4/11/1996 0.14 MW10 (LLMW-10) 8/2/2010 0.059 0.057 1/28/2010 0.077 0.074 9/9/2009 0.09 0.086 1/19/2009 0.1 0.1 9/23/2008 0.11 0.11 4/24/2008 0.11 0.11 7/20/2007 0.12 0.12 1/9/2007 0.18 0.17 7/26/2006 0.141 0.136 1/12/2006 0.147 0.141 7/18/2005 0.172 0.165 1/28/2005 0.175 0.168 11/16/2004 0.301 11/16/04 (dup) 0.327 0.314

8/9/2004 0.273 2/13/2004 0.178 7/21/2003 0.253 5/13/2003 0.302 5/13/03 (dup) 0.304

3/4/2003 0.3 3/4/03 (dup) 0.318 10/15/2002 0.395

11/3/10 Page 2 of 4 Table 5.8

### Table 5.8 Local Landfill APFO and PFOA in Groundwater Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA** (ug/L) Active Sampling Locations

9/3/2002 0.357 5/20/2002 0.56 3/28/2002 0.698 2/25/2002 1.12 1/27/2002 0.162 12/13/2001 0.133 5/20/1999 0.15 5/28/1998 0.22

MW12B (LLMW-12B) 8/3/2010 0.1 0.1 1/29/2010 0.15 0.14 9/9/2009 0.17 0.16 1/19/2009 0.19 0.18 9/24/2008 0.14 0.13 7/31/2003 NQ (<0.05) 5/14/2003 0.0839 3/3/2003 NQ (<0.05) 10/8/2002 0.0658

MW11A (LLMW-11A) 8/3/2010 3.5 3.4 1/29/2010 2.6 2.5 9/8/2009 3.5 3.4 1/20/2009 2.9 2.8 9/24/2008 2.8 2.7 7/31/2003 1.67 5/14/2003 2.09 3/4/2003 2.05 10/8/2002 2.22 MW13B (LLMW-13B) 8/3/2010 3.9 3.7 1/29/2010 3.2 3.1 9/9/2009 4.1 3.9 1/20/2009 3.7 3.6 9/24/2008 5.5 5.3 7/31/2003 5.11 5/14/2003 6.43 3/3/2003 6.38 10/8/2002 6.61 MW14B (LLMW-14B) 8/3/2010 0.82 0.79 1/29/2010 0.58 0.56 9/8/2009 0.71 0.68 1/20/2009 0.6 0.58 9/24/2008 0.58 0.56 7/31/2003 0.332 5/14/2003 0.646 3/3/2003 0.317 10/9/2002 0.488 C-Zone B-Zone

11/3/10 Page 3 of 4 Table 5.8

## Table 5.8 Local Landfill APFO and PFOA in Groundwater Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO (ug/L) PFOA** (ug/L)

MW11B (LLMW-11B) 7/31/2003 NQ (<0.05) 5/21/2003 NQ (<0.05) 3/4/2003 NQ (<0.05) 10/8/2002 NQ (<0.05)

J= estimated value (below laboratory quantitation limit) ND= Not Detected at or above the limit of detection (LOD) NQ= Not Quantifiable. Detected at a concentration above the LOD and below the limit of quantification (LOQ). Note: Analytical method changed as of November 2001. *APFO is also known as C-8 or FC-143. ** Both APFO and PFOA are reported starting with analyses performed after December 1, 2004. Historic Sampling Locations

D-Zone

11/3/10 Page 4 of 4 Table 5.8

### Table 5.9 Letart Landfill APFO and PFOA in Surface Water Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA** (ug/L) Outlet LCH1 7/22/2010 1100 1100 (LCH1 (Leachate) - PT) 2/4/2010 840 810 8/5/2009 750 720 1/23/2009 620 600 7/8/2008 400 380 1/23/2008 550 530 7/23/2007 1000 1000 3/26/2007 323 310 7/20/2006 1570 1510 2/6/2006 917 881 7/19/2005 254 244 4/27/2005 85.4 82 3/8/2005 403 387 Outlet 002& 7/22/2010 0.018 0.017 5/11/2010 <0.0038 <0.0038 2/4/2010 ND (<0.0035) ND (<0.0035) 10/15/2009 0.036 0.035

8/5/2009 0.061 0.059 4/13/09 0.046 0.044 1/23/2009 NQ (<0.013) NQ (<0.013) 10/6/2008 0.051 0.049 7/8/2008 0.014 0.013 4/4/2008 <0.0019 <0.0019 1/23/2008 NQ (<0.011) NQ (<0.011) 11/15/2007 NQ (<0.016) NQ (<0.016) 7/23/2007 0.033 0.032 6/7/2007 ND (<0.0027) ND (<0.0027) 3/26/2007 ND (<0.0010) ND (<0.0010) 10/27/2006 28 27 10/26/2006 no flow no flow 7/20/2006 0.228 0.219 4/28/2006 66.8 64.2 2/6/2006 0.0175 0.0168 11/1/2005 62.9 60.4 7/19/2005 940 903 4/27/2005 360 346 3/8/2005 0.131 0.126 Outlet 002 - PT& 8/12/2004 408 Outlet 002 - AT 8/12/2004 ND (<0.01) Outlet 002 –Bed 2 3/8/2005 Insufficient Flow Insufficient Flow 12/10/2004 NQ (<0.05) NQ (<0.05) 12/2/2004 0.118 0.113 11/10/2004 NQ (<0.05) 10/29/2004 NQ (<0.05) Outlet 002 –Bed 1 9/23/2004 37.9 8/12/2004 1.1 7/23/2004 14.8 6/21/2004 0.851 5/25/2004 1200 4/23/2004 184 Outlet 002& 3/26/2004 ND (<0.01) [002(LEACHATE BASIN)] 2/23/2004 720 1/29/2004 395 12/9/2003 125 11/19/2003 30 9/16/2003 1950 8/13/2003 867 7/30/2003 Insufficient Flow 6/13/2003 Not Sampled‡ 5/23/2003 Not Sampled‡ 4/30/2003 Not Sampled‡ 3/28/2003 Not Sampled‡ 2/28/2003 Not Sampled*** Active Sampling Locations

11/3/10 Page 1 of 4 Table 5.9

### Table 5.9 Letart Landfill APFO and PFOA in Surface Water Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA** (ug/L) Active Sampling Locations

1/24/2003 Insufficient Flow 12/30/2002 1170 11/25/2002 939 10/31/2002 645 9/27/2002 4.52 8/30/2002 2050 7/30/2002 1410 6/28/2002 Not Analyzed# 5/30/2002 1630 4/30/2002 443 3/28/2002 131 2/19/2002 355 1/25/2002 50.1 12/14/2001 36.1 11/27/2001 53.2 7/20/2001 159 7/25/2000 1350 4/3/2000 1900 1/14/2000 920 10/21/1999 3240

11/3/10 Page 2 of 4 Table 5.9

### Table 5.9 Letart Landfill APFO and PFOA in Surface Water Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA** (ug/L) OUTLET 003 4/30/2003 Insufficient Flow 3/31/2003 Insufficient Flow 2/28/2003 Not Sampled*** 1/31/2003 Insufficient Flow 12/30/2002 Insufficient Flow 11/30/2002 Insufficient Flow 10/31/2002 Insufficient Flow 9/27/2002 0.17 8/30/2002 Insufficient Flow 7/30/2002 Insufficient Flow 6/28/2002 Not Analyzed# 5/30/2002 0.282 4/29/2002 0.0653 3/28/2002 0.198 2/19/2002 Insufficient Flow 1/25/2002 0.148 12/14/2001 0.39 Outlet 004 10/26/2006 470 450 7/20/2006 758 728 4/28/2006 753 723 2/6/2006 17.1 16.4 11/1/2005 2820 2710 7/19/2005 609 585 4/27/2005 191 183 1/27/2005 139 134 BRINKER’S RUN 5/21/2003 0.442 3/13/2003 0.247 10/14/2002 0.0612 CAP RUNOFF 4/30/2003 Not Sampled‡ 3/28/2003 Not Sampled‡ 2/28/2003 Not Sampled*** 1/24/2003 Insufficient Flow 12/30/2002 415 11/25/2002 65.1 10/31/2002 102 9/27/2002 50.9 8/30/2002 Insufficient Flow 6/28/2002 Not Analyzed# 5/30/2002 371 4/29/2002 279 3/28/2002 Not Sampled 2/19/2002 Insufficient Flow 1/25/2002 119 LEACHATE 11/27/2001 53.2 7/20/2001 159 7/25/2000 2250 7/20/1999 1030 LOWER POND 1/14/2000 1410 4/3/2000 1260 10/21/1999 2530 7/19/1999 1190 5/28/1998 1100 7/23/1997 1600 4/17/1996 1900 9/20/1994 2200 3/15/1994 730 12/27/1991 1300 11/22/1991 1000 4/26/1991 670 3/22/1991 340 2/8/1991 400

Historic Sampling Locations

11/3/10 Page 3 of 4 Table 5.9

### Table 5.9 Letart Landfill APFO and PFOA in Surface Water Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA** (ug/L) Historic Sampling Locations

1/18/1991 1200 N SPRING FLOW 3/12/1992 0.3 3/12/1992 0.3 RT 33 STREAM 3/28/2003 2.27 10/31/2002 2.83 9/27/2002 2.24 8/30/2002 Insufficient Flow 5/30/2002 1.57 4/29/2002 0.845 3/28/2002 1.26 2/19/2002 3.92 1/25/2002 1.9 7/20/2001 2.01 7/31/2000 0.573 7/20/1999 2.23 7/23/1997 2 4/17/1996 1.8 STREAM MN RD 3/15/1994 0.5 9/20/1994 0.9 SW SPRING FLOW 3/12/1992 1 UPPER POND 7/19/1999 517 5/28/1998 480 7/23/1997 <200 4/17/1996 2100 3/15/1994 4400 12/27/1991 4100 11/22/1991 790 4/26/1991 930 3/22/1991 500 2/8/1991 2300 1/18/1991 2900

Note: Analytical method changed as of November 2001. *APFO is also known as C-8 or FC-143. ** These surface water locations were not sampled due to downed trees from an ice storm that prohibited access to the landfill. ***Both APFO and PFOA are reported starting with analyses performed after December 1, 2004 # Samples were taken at the respective surface water locations. However, due to an error by the courier, the samples arrived at the lab warm and were not analyzed. ‡ These sampling points could not be accessed due to a rock slide that had covered the sampling locations. & All of these samples were collected from the same location. However, the outlet was reconfigured with the addition of the pilot GAC Treatment system and again with construction of the permanent GAC Treatment system.

11/3/10 Page 4 of 4 Table 5.9

### Table 5.10 Letart Landfill APFO and PFOA in Groundwater Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA ** (ug/L)

MWL1 (LMW-1) 7/22/2010 1400 1300 4/20/2010 1200 1200 2/2/2010 1600 1500 10/8/2009 2300 2200 7/10/2009 2500 2400 4/7/2009 5500 5300 1/22/2009 3000 2900 10/8/2008 4100 3900 7/9/2008 3300 3200 4/4/2008 3100 3000 1/22/2008 3600 3500 10/10/2007 4000 3800 7/25/2007 3100 3000 4/12/2007 4800 4600 1/16/2007 6800 6500 10/25/2006 4900 4700 7/19/2006 51000 49000 4/26/2006 21000 20200 2/2/2006 9770 9380 11/1/2005 9740 9360 7/20/2005 2540 2440 4/28/2005 4130 3970 1/26/2005 17500 16800 11/9/2004 13000 8/11/2004 6330 5/19/2004 5880 2/11/2004 12700 12/5/2003 13100 7/23/2003 57200 5/21/2003 27300 3/12/2003 25000 10/14/2002 25900 8/29/2002 23000 5/24/2002 30500 3/29/2002 20600 2/24/2002 18400 1/26/2002 29400 12/10/2001 24600 11/27/2001 16900 7/19/2001 6100 1/31/2001 9190 10/4/2000 10600 7/24/2000 8990 4/3/2000 13600 1/13/2000 17400 10/21/1999 12600 7/20/1999 6920 5/28/1998 24000 7/23/1997 5100 4/17/1996 1700 11/22/1991 68 3/22/1991 60 MWL7 (LMW-7) 7/22/2010 1000 1000 4/20/2010 25000 24000 2/2/2010 300 290 10/8/2009 260 250 7/10/2009 230 220 4/7/2009 290 280 1/22/2009 300 290 10/6/2008 230 220 7/9/2008 220 210 4/4/2008 280 270

A ctive Sampling Locations

A -Zone Wells

11/3/10 Page 1 of 12 Table 5.10

### Table 5.10 Letart Landfill APFO and PFOA in Groundwater Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA ** (ug/L) A ctive Sampling Locations

1/22/2008 270 260 10/10/2007 350 330 7/24/2007 310 300 4/12/2007 280 270 1/16/2007 380 360 10/25/2006 330 320 7/19/2006 337 324 4/26/2006 407 391 2/2/2006 478 459 11/1/2005 548 526 7/20/2005 309 297 4/25/2005 1030 987 1/26/2005 432 415 11/10/2004 267 8/11/2004 415 5/18/2004 304 2/11/2004 356 12/5/2003 151 7/23/2003 273 5/21/2003 385 3/12/2003 218 10/14/2002 300 8/27/2002 197 5/24/2002 567 3/29/2002 324 2/24/2002 180 1/26/2002 496 12/10/2001 334 11/27/2001 365 7/20/2001 242 1/31/2001 249 10/4/2000 231 7/25/2000 158 4/3/2000 211 1/13/2000 219 10/20/1999 339 7/20/1999 78.3 5/28/1998 260 7/23/1997 53 4/17/1996 15 11/22/1991 0.1 MWL8 (LMW-8) 7/22/2010 990 950 4/22/2010 1400 1300 2/2/2010 1500 1400 10/8/2009 1500 1400 7/10/2009 1400 1300 4/7/2009 1500 1400 1/22/2009 1400 1300 10/8/2008 790 760 7/9/2008 1100 1100 4/3/2008 2000 1900 1/22/2008 1700 1600 10/10/2007 1400 1300 7/25/2007 1500 1400 4/12/2007 2200 2100 1/16/2007 1700 1600 10/25/2006 2100 2000 7/19/2006 2240 2150 4/26/2006 2400 2310 2/2/2006 2090 2010 11/1/2005 3330 3200 7/20/2005 2320 2230

11/3/10 Page 2 of 12 Table 5.10

### Table 5.10 Letart Landfill APFO and PFOA in Groundwater Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA ** (ug/L) A ctive Sampling Locations

4/28/2005 5840 5610 1/26/2005 2700 2590 11/9/2004 3730 8/11/2004 2080 5/20/2004 2650 2/11/2004 2140 12/5/2003 1940 7/23/2003 2780 5/20/2003 3100 3/12/2003 1720 10/14/2002 3480 8/29/2002 3100 5/24/2002 4020 3/29/2002 3520 2/23/2002 2230 1/26/2002 3930 12/10/2001 3240 11/27/2001 2610 7/19/2001 1120 1/30/2001 2650 10/4/2000 2300 7/24/2000 2160 4/3/2000 2180 1/13/2000 2100 10/20/1999 3260 7/20/1999 1790 5/28/1998 2700 7/23/1997 2000 4/17/1996 2200 11/22/1991 280 MWL15 7/26/2010 0.08 0.077 4/22/2010 0.2 0.19 2/4/2010 1.8 1.7 7/7/2009 0.046 0.044 1/26/2009 0.46 0.44 7/9/2008 0.039 0.038 1/24/2008 0.27 0.26 7/26/2007 0.39 0.37 1/17/2007 0.25 0.24 MWL16 7/26/2010 4000 3800 4/20/2010 3400 3300 2/4/2010 2500 2400 7/7/2009 2700 2600 1/26/2009 2200 2100 7/9/2008 2200 2100 1/24/2008 2200 2100 7/26/2007 2100 2000 1/17/2007 1500 1400 MWL17 7/26/2010 620 600 4/20/2010 610 590 2/4/2010 620 600 7/7/2009 520 500 1/26/2009 400 380 7/9/2008 330 320 1/24/2008 350 340 7/26/2007 350 340 1/17/2007 250 240

MWL4 (LMW-4) 7/23/2010 700 670 4/22/2010 640 610 2/3/2010 770 740 10/9/2009 720 690 7/8/2009 860 830 4/8/2009 650 620 1/23/2009 690 660 D/E - Zone Wells

11/3/10 Page 3 of 12 Table 5.10

### Table 5.10 Letart Landfill APFO and PFOA in Groundwater Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA ** (ug/L) A ctive Sampling Locations

10/6/2008 500 480 7/8/2008 530 510 4/3/2008 750 720 1/23/2008 790 760 10/10/2007 750 720 7/24/2007 770 740 4/13/2007 840 810 1/17/2007 1500 1400 10/25/2006 1200 1200 7/19/2006 1340 1290 4/26/2006 1780 1710 2/2/2006 1730 1660 10/31/2005 2670 2560 7/19/2005 993 954 4/25/2005 1880 1810 1/26/2005 1080 1040 11/10/2004 1940 8/11/2004 1710 5/18/2004 1230 2/10/2004 927 12/4/2003 906 7/22/2003 992 5/19/2003 1280 3/11/2003 1520 10/11/2002 2840 8/27/2002 1410 5/21/2002 1690 3/27/2002 2620 2/23/2002 2250 1/26/2002 3060 12/13/2001 1580 11/27/2001 1720 4/3/2000 272 4/3/2000 (dup) 220

1/14/2000 172 11/22/1991 830 3/28/1991 690 MWL13A (LMW-13A) 7/26/2010 35 34 4/19/2010 30 29 2/1/2010 25 24 10/7/2009 22 21 7/8/2009 26 25 4/6/2009 29 28 1/22/2009 40 38 10/8/2008 40 38 7/14/2008 26 25 4/2/2008 28 27 1/21/2008 46 44 10/8/2007 50 48 7/23/2007 57 55 4/13/2007 62 60 1/15/2007 71 68 10/24/2006 76 73 7/18/2006 89.3 85.8 4/27/2006 96.7 92.9 2/2/2006 134 129 10/31/2005 160 154 7/19/2005 102 97.5 4/28/2005 170 163 1/27/2005 125 120 11/12/2004 234 7/24/2003 177 5/19/2003 185 3/11/2003 144 10/10/2002 510

11/3/10 Page 4 of 12 Table 5.10

### Table 5.10 Letart Landfill APFO and PFOA in Groundwater Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA ** (ug/L) A ctive Sampling Locations

MWL14A (LMW-14A) 7/26/2010 1400 1300 4/19/2010 1100 1100 2/1/2010 1200 1200 10/7/2009 1400 1300 7/8/2009 1000 1000 4/7/2009 1500 1400 1/21/2009 1100 1100 10/7/2008 970 930 7/14/2008 1000 980 4/2/2008 850 820 1/21/2008 910 870 10/8/2007 1000 1000 7/23/2007 1000 970 4/13/2007 910 870 1/15/2007 840 810 10/24/2006 900 860 7/18/2006 1010 970 4/27/2006 1000 963 2/2/2006 829 796 10/31/2005 1320 1270 7/19/2005 794 763 4/28/2005 969 931 1/27/2005 829 796 11/12/2004 1280 7/24/2003 766 5/19/2003 998 3/11/2003 498 10/10/2002 974

MWL2A (LMW-2A) 7/22/2010 1900 1800 4/20/2010 1200 1200 2/2/2010 1400 1300 10/8/2009 1400 1300 7/10/2009 1000 1000 4/7/2009 1200 1200 1/21/2009 980 940 10/6/2008 980 940 7/14/2008 920 880 4/3/2008 820 790 1/22/2008 960 920 10/10/2007 1500 1400 7/24/2007 1000 1000 4/12/2007 990 950 1/16/2007 950 910 10/25/2006 920 880 7/19/2006 1480 1420 4/26/2006 1120 1080 2/2/2006 837 804 11/1/2005 1500 1440 7/20/2005 864 830 4/25/2005 1250 1200 1/26/2005 844 811 11/10/2004 1260 8/11/2004 1240 5/18/2004 867 2/11/2004 749 12/8/2003 416 7/22/2003 1020 5/20/2003 998 3/12/2003 676 10/14/2002 931 8/27/2002 676 5/24/2002 922 D/E and F-Zone Wells

11/3/10 Page 5 of 12 Table 5.10

### Table 5.10 Letart Landfill APFO and PFOA in Groundwater Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA ** (ug/L) A ctive Sampling Locations

3/29/2002 717 2/24/2002 714 1/26/2002 740 12/11/2001 830 11/27/2001 444 7/19/2001 242 1/30/2001 423 10/5/2000 248 7/25/2000 275 4/3/2000 660 1/14/2000 453 10/21/1999 370 7/20/1999 350 5/28/1998 990 7/23/1997 460 4/17/1996 460 9/20/1994 270 3/15/1994 260 11/22/1991 63 3/22/1991 50 MWL11 (LMW-11) 7/23/2010 0.22 0.21 4/22/2010 0.21 0.2 2/3/2010 0.2 0.19 10/7/2009 0.19 0.18 7/8/2009 0.22 0.21 4/8/2009 0.18 0.17 1/23/2009 0.15 0.14 10/8/2008 0.14 0.13 7/8/2008 0.15 0.14 4/3/2008 0.15 0.14 1/23/2008 0.16 0.15 10/8/2007 0.17 0.16 7/24/2007 0.15 0.14 4/12/2007 0.14 0.13 1/15/2007 0.12 0.12 10/24/2006 0.15 0.14 7/18/2006 1.85 1.78 4/26/2006 0.202 0.194 2/2/2006 0.131 0.126 10/31/2005 0.255 0.245 7/19/2005 0.128 0.123 4/25/2005 0.324 0.311 1/26/2005 0.135 0.13 11/10/2004 0.22 8/11/2004 0.226 5/18/2004 0.126 2/10/2004 0.11 12/4/2003 0.111 7/22/2003 0.128 5/20/2003 0.124 3/12/2003 0.12 10/14/2002 0.121 8/27/2002 0.058 5/21/2002 0.069 3/29/2002 0.119 2/24/2002 0.112 1/26/2002 0.159 12/11/2001 0.128 11/27/2001 0.0989

MWL5B (LMW-5B) 7/23/2010 1400 1300 7/23/2010 (dup) 1600 1500 4/22/2010 5000 4800 4/22/2010 (dup) 5400 5200 2/3/2010 1800 1700 2/3/2010 (dup) 1900 1800 F-Zone Wells

11/3/10 Page 6 of 12 Table 5.10

### Table 5.10 Letart Landfill APFO and PFOA in Groundwater Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA ** (ug/L) A ctive Sampling Locations

10/9/2009 1700 1600 10/9/2009 (dup) 1900 1800 7/8/2009 1900 1800 7/8/2009 (dup) 2000 1900 4/8/09 2700 2600 4/8/2009 (dup) 2300 2200

1/23/2009 1100 1100 1/23/2009 (dup) 1200 1200 10/8/2008 1400 1300 10/8/2008 (dup) 1400 1300 7/8/2008 1400 1300 7/8/2008 (dup) 1200 1200 4/3/2008 1200 1200 4/3/2008 (dup) 1200 1200

1/23/2008 1400 1300 1/23/2008 (dup) 1700 1600

10/10/2007 1500 1400 10/10/2007 (dup) 1600 1500 7/24/2007 1600 1500 7/24/2007 (dup) 1600 1500 4/13/2007 1500 1400 4/13/2007 (dup) 1500 1400 1/17/2007 2300 2200 1/17/2007 (dup) 2900 2800

10/24/2006 1600 1500 10/24/2006 (dup) 1500 1400 7/19/2006 1440 1380 7/19/2006 (dup) 1550 1490 4/26/2006 2110 2030 4/26/2006 (dup) 1940 1860 2/2/2006 1430 1370 2/2/2006 (dup) 1450 1390

10/31/2005 2550 2450 10/31/2005 (dup) 2690 2580 7/19/2005 1740 1670 7/19/2005 (dup) 1550 1490 4/25/2005 1960 1880 4/25/2005 (dup) 2450 2350 1/26/2005 1510 1450 1/26/2005 (dup) 1490 1430 11/10/2004 2280 11/10/2004(dup) 2710 8/11/2004 2480 8/11/2004 (dup) 2510 5/18/2004 1790 5/18/2004 (dup) 1760 2/10/2004 1260 2/10/2004 (dup) 1280 12/4/2003 901 12/4/2003 (dup) 915

7/22/2003 1800 7/22/2003 (dup) 1940 5/19/2003 2010 5/19/2003 (dup) 1660 3/11/2003 1470 3/11/2003 (dup) 1520

10/11/2002 2230 10/11/2002 (dup) 2280 8/27/2002 1480 8/27/2002 (dup) 1340 5/21/2002 1720 5/21/2002 (dup) 1630 3/27/2002 1810 3/27/2002 (dup) 1850 2/23/2002 1460 2/23/2002(dup) 1490

11/3/10 Page 7 of 12 Table 5.10

### Table 5.10 Letart Landfill APFO and PFOA in Groundwater Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA ** (ug/L) A ctive Sampling Locations

1/26/2002 1780 1/26/2002 (dup) 1890

12/11/2001 1880 11/27/2001 1600 11/27/2001 (dup) 1680 7/20/2001 483 7/20/2001(dup) 592

1/31/2001 615 10/5/2000 1190. J 10/5/2000 (dup) 780

7/25/2000 900. J 4/3/2000 1100 4/3/2000 (dup) 1020

1/14/2000 1030 10/21/1999 1750 10/21/99 (dup) 1700

7/20/1999 445 7/23/1997 480 9/20/1994 530 3/15/1994 1200 11/22/1991 380 3/22/1991 340 MWL6 (LMW-6) 7/26/2010 4.9 4.7 4/19/2010 6.9 6.6 2/1/2010 5 4.8 10/7/2009 5.2 5 7/7/2009 8.7 8.4 4/6/2009 8 7.7 1/21/2009 6.9 6.6 10/7/2008 7.9 7.6 7/14/2008 6.2 6 4/2/2008 2.1 J 2 J 1/21/2008 8.6 8.3 10/8/2007 6.6 6.3 7/23/2007 6.2 6 4/12/2007 5.2 5 1/15/2007 9.7 9.3 10/24/2006 9.7 9.3 7/18/2006 8.88 8.53 4/26/2006 9.66 9.28 2/2/2006 9.79 9.4 10/31/2005 10.4 9.98 7/20/2005 7.32 7.03 4/28/2005 10.6 10.1 1/27/2005 6.44 6.19 11/9/2004 14 8/11/2004 12 5/19/2004 10.1 2/11/2004 9.11 12/8/2003 5.85 7/23/2003 9.73 5/21/2003 9.53 3/13/2003 11.6 10/14/2002 15.1 8/27/2002 10.5 5/24/2002 20.7 3/29/2002 14.8 2/24/2002 14.9 1/26/2002 18.1 12/11/2001 15.8 11/27/2001 15 1/13/2000 9.4 5/28/1998 30 11/22/1991 24 3/22/1991 25

11/3/10 Page 8 of 12 Table 5.10

### Table 5.10 Letart Landfill APFO and PFOA in Groundwater Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA ** (ug/L) A ctive Sampling Locations

MWL9 (LMW-9) 7/22/2010 0.94 0.9 4/19/2010 1 0.96 2/2/2010 1.1 1 10/8/2009 0.81 0.78 7/10/2009 0.84 0.81 4/8/2009 0.92 0.88 1/22/2009 0.98 0.96 10/7/2008 0.67 0.64 7/9/2008 0.66 0.63 4/3/2008 0.69 0.66 1/22/2008 0.92 0.88 11/21/2007 0.71 0.68 7/25/2007 0.7 0.67 6/7/2007 0.69 0.66 1/16/2007 0.57 0.55 10/25/2006 0.91 0.87 7/19/2006 0.595 0.572 4/28/2006 0.789 0.758 2/8/2006 3.41 3.28 11/1/2005 1.02 0.982 7/19/2005 0.624 0.599 4/27/2005 931 894 1/27/2005 0.543 0.522 11/9/2004 1.23 8/12/2004 0.583 5/20/2004 0.589 2/11/2004 0.547 12/5/2003 0.789 7/23/2003 0.803 5/20/2003 0.856 3/12/2003 0.625 10/17/2002 0.907 8/29/2002 0.479 5/24/2002 0.715 3/27/2002 0.631 2/23/2002 0.617 1/26/2002 0.875 12/10/2001 0.845 11/27/2001 0.612 10/7/1992 0.2

11/3/10 Page 9 of 12 Table 5.10

### Table 5.10 Letart Landfill APFO and PFOA in Groundwater Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA** (ug/L)

MWL3 (LMW-3) 8/12/2004 Insufficient Flow 5/19/2004 Insufficient Flow 2/11/2004 Insufficient Flow 12/4/2003 Insufficient Flow 7/24/2003 2060 5/21/2003 2030 3/11/2003 Insufficient Flow 10/11/2002 NQ (<0.05) 8/26/2002 Insufficient Flow 5/24/2002 2270 3/29/2002 1760 2/24/2002 1920 1/29/2002 1700 12/13/2001 1530 11/22/1991 1000 3/22/1991 390 MWL12 (LMW-12) 8/11/2004 Insufficient Flow 5/18/2004 Insufficient Flow 3/11/2004 Insufficient Flow 7/24/2003 Insufficient Flow 5/20/2003 Insufficient Flow 3/11/2003 Insufficient Flow 10/10/2002 Insufficient Flow

MWL3A (LMW-3A) 10/8/2009 Insufficient Flow Insufficient Flow 7/7/2009 Insufficient Flow Insufficient Flow 4/8/2009 Insufficient Flow Insufficient Flow 1/23/2009 Insufficient Flow Insufficient Flow 10/8/2008 Insufficient Flow Insufficient Flow 7/8/2008 Insufficient Flow Insufficient Flow 4/3/2008 Insufficient Flow Insufficient Flow 1/23/2008 Insufficient Flow Insufficient Flow 10/10/2008 Insufficient Flow Insufficient Flow 7/24/2007 Insufficient Flow Insufficient Flow 4/13/2007 Insufficient Flow Insufficient Flow 1/17/2007 Insufficient Flow Insufficient Flow 10/24/2006 Insufficient Flow Insufficient Flow 7/18/2006 dry dry 4/27/2006 dry dry 2/2/2006 Insufficient Flow Insufficient Flow 10/31/2005 Insufficient Flow Insufficient Flow 7/20/2005 Insufficient Flow Insufficient Flow 4/27/2005 238 229 1/26/2005 159 153 11/9/2004 221 8/12/2004 175 5/19/2004 113 2/10/2004 71.3 12/4/2003 76.4 7/22/2003 146 5/19/2003 200 3/11/2003 144 10/11/2002 204 8/26/2002 Insufficient Flow 5/24/2002 134 3/29/2002 132 2/23/2002 101 1/26/2002 98.6 12/11/2001 101 7/19/1999 60.3 

### Historic Sampling Locations

C-Zone Wells

D/E Zone Wells

11/3/10 Page 10 of 12 Table 5.10

### Table 5.10 Letart Landfill APFO and PFOA in Groundwater Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA** (ug/L) 

### Historic Sampling Locations

11/22/1991 350 3/22/1991 380 MWL5A (LMW-5A) 8/12/2004 2230 5/18/2004 1270 2/10/2004 1010 12/4/2003 544 7/24/2003 473 5/21/2003 245 3/11/2003 134 10/11/2002 112 8/26/2002 Insufficient Flow 5/21/2002 87.6 3/27/2002 93.6 2/23/2002 82.2 1/26/2002 99.3 12/11/2001 94.5 11/22/1991 0.9 3/22/1991 1.6

MWL13B (LMW-13B) 10/8/2009 Insufficient Flow Insufficient Flow 7/7/2009 Insufficient Flow Insufficient Flow 4/8/2009 Insufficient Flow Insufficient Flow 1/22/2009 Insufficient Flow Insufficient Flow 10/8/2008 Insufficient Flow Insufficient Flow 7/14/2008 Insufficient Flow Insufficient Flow 4/2/2008 Insufficient Flow Insufficient Flow 1/21/2008 Insufficient Flow Insufficient Flow 10/8/2007 dry dry 7/23/2007 Insufficient Flow Insufficient Flow 1/15/2007 Insufficient Flow Insufficient Flow 10/24/2006 dry dry 7/18/2006 dry dry 2/2/2006 2.51 2.41 10/31/2005 4.35 4.18 7/19/2005 3.27 3.14 4/28/2005 3.89 3.74 4/28/2005 (dup) 3.74 3.59 1/27/2005 2.99 2.87 11/12/2004 5.48 7/24/2003 4.97 5/19/2003 0.603 3/11/2003 0.149 10/10/2002 0.0956 MWL14B (LMW-14B) 10/8/2009 Insufficient Flow Insufficient Flow 7/7/2009 Insufficient Flow Insufficient Flow 4/8/2009 Insufficient Flow Insufficient Flow 1/21/2009 Insufficient Flow Insufficient Flow 10/7/2008 Insufficient Flow Insufficient Flow 7/14/2008 Insufficient Flow Insufficient Flow 4/2/2008 Insufficient Flow Insufficient Flow 1/21/2008 Insufficient Flow Insufficient Flow 10/8/2007 dry dry 7/23/2007 Insufficient Flow Insufficient Flow 4/13/2007 Insufficient Flow Insufficient Flow 1/15/2007 50 48 7/18/2006 51.8 49.8 4/27/2006 65.2 62.6 2/2/2006 Insufficient Flow Insufficient Flow 10/31/2005 Insufficient Flow Insufficient Flow 7/19/2005 75.3 72.3 4/28/200 5 79 75.9 F-Zone Wells

11/3/10 Page 11 of 12 Table 5.10

### Table 5.10 Letart Landfill APFO and PFOA in Groundwater Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA** (ug/L) 

### Historic Sampling Locations

1/27/2005 Insufficient Flow Insufficient Flow 11/12/2004 254 7/24/2003 Insufficient Flow 5/19/2003 101 3/12/2003 70.4 10/10/2002 105

MWL10 (LMW-10) 12/8/2003 Insufficient Flow 7/24/2003 Insufficient Flow 5/20/2003 Pump problems-Not sampled 3/11/2003 Insufficient Flow

10/17/2002 Instrumentation problems-Not sample 8/29/2002 Pump problems-Not sampled 5/21/2002 0.298 3/27/2002 0.136 2/23/2002 0.126 1/26/2002 0.133 12/13/2001 0.161 12/13/2001 (dup) 0.135 11/27/2001 0.213

J = estimated value (below laboratory quantitation limit). Note: Analytical method changed as of November 2001. * APFO is also known as C-8 or FC-143. ** Both APFO and PFOA are reported starting with analysis performed after December 1, 2004. Under F-Zone Wells

11/3/10 Page 12 of 12 Table 5.10

### Table 5.11 Dry Run Landfill APFO and PFOA in Surface Water Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA** ug/L OUTLET 006@ 9/20/2010 0.59 0.57 9/20/2010 (dup) 0.55 0.53 8/16/2010 0.64 0.61 8/16/2010 (dup) 0.65 0.62 7/13/2010 0.2 0.19 7/13/2010 (dup) 0.2 0.19 6/22/2010 0.11 0.11 6/22/2010 (dup) 0.1 0.1 5/11/2010 0.52 0.5 5/11/2010 (dup) 0.53 0.51 4/2/2010 0.9 0.86 4/2/2010 (dup) 0.86 0.83 3/3/2010 NQ (<0.18) NQ (<0.18) 3/3/2010 (dup) NQ (<0.18) NQ (<0.18) 2/18/2010 2.7 2.6 2/18/2010 (dup) 2.6 2.5 1/14/2010 1 1 1/14/2010 (dup) 0.96 0.92 12/3/2009 0.068 0.065 12/3/2009 (dup) 0.08 0.077 11/17/2009 0.032 0.031 11/17/2009 (dup) 0.03 0.029 10/14/2009 0.029 0.028 10/14/2009 (dup) 0.035 0.034 9/21/2009 <0.0026 <0.0026 8/4/2009 <0.0026 <0.0026 8/4/2009 (dup) <0.0026 <0.0026 7/6/2009 0.49 0.47

6/1/09 0.52 0.5 6/1/2009 (dup) 0.61 0.59 5/6/09 NQ (<0.013) NQ (<0.013) 5/6/2009 (dup) NQ (<0.013) NQ (<0.013) 4/6/09 2 1.9 3/3/2009 1.2 1.2 3/3/09 (dup) 1.2 1.2

2/2/2009 1.2 1.2 1/19/2009 0.92 0.88 12/1/2008 0.64 0.61 12/1/08 (dup) 0.61 0.59

11/17/2008 0.019 0.018 10/9/2008 ND (<0.0017) ND (<0.0017) 9/16/2008 ND (<0.0023) ND (<0.0023) 8/18/2008 ND (<0.0023) ND (<0.0023) 8/18/08 (dup) ND (<0.0023) ND (<0.0023)

7/29/2008 1.7 1.6 6/18/2008 0.47 0.45 6/18/08 (dup) 0.47 0.45

5/12/2008 1.6 1.5 4/8/2008 1.6 1.5 4/8/08 (dup) 1.5 1.4

3/12/2008 3.1 3.0 3/12/08 (dup) 3.2 3.1 2/4/2008 3.7 3.6 2/4/08 (dup) 3.6 3.5 Active Sampling Locations

11/3/10 Page 1 of 13 Table 5.11

### Table 5.11 Dry Run Landfill APFO and PFOA in Surface Water Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA** ug/L Active Sampling Locations

1/7/2008 2.2 2.1 12/27/2007 0.86 0.83 12/27/07 (dup) 0.91 0.87

11/15/2007 NQ (<0.016) NQ (<0.016) 10/24/2007 ND (<0.0031) ND (<0.0031) 9/20/2007 NQ (<0.016) NQ (<0.016) 7/2/2007 ND (<0.0012) ND (<0.0012) 6/14/2007 NQ (<0.013) NQ (<0.013) 5/15/2007 0.01 0.01 4/27/2007 0.033 0.032 4/27/07 (dup) 0.025 0.024 OUTLET 001@ 3/14/2007 77 74 2/21/2007 45 43 2/21/07 (dup) 45 43 1/4/2007 100 98 12/7/2006 87 84 11/10/2006 59 57 11/13/2006 67 64 11/2/2006 55 53 10/26/2006 45 43 10/19/2006 29 28 10/11/2006 26 25 10/5/2006 21 20 9/28/2006 23 22 9/21/2006 22 21 9/14/2006 23 22 9/7/2006 37 36 8/31/2006 42 40 8/22/2006 46 44 8/16/2006 43 41 8/10/2006 41 39 8/2/2006 50 48 7/26/2006 49.8 47.8 7/20/2006 54 52 7/11/2006 66 63 7/5/2006 61.6 59.1 6/29/2006 72.1 69.3 6/21/2006 82.4 79.2 6/15/2006 82.5 79.2 6/8/2006 92.3 88.7 5/4/2006 113 109 4/7/2006 101 97 3/14/2006 100 96.2 3/14/06 (dup) 103 98.7

2/15/2006 74.1 71.2 1/19/2006 51.9 49.9 12/13/2005 41.9 40.2 12/13/05 (dup) 41.5 39.9 11/9/2005 60.4 58 11/9/05 (dup) 62.3 59.8

10/7/2005 60.6 58.2 10/7/05 (dup) 57.9 55.6

9/27/2005 66.1 63.5 8/31/2005 47.6 45.7

11/3/10 Page 2 of 13 Table 5.11

### Table 5.11 Dry Run Landfill APFO and PFOA in Surface Water Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA** ug/L Active Sampling Locations

8/31/05 (dup) 48.1 46.2

7/18/2005 80.6 77.4 6/15/2005 Insufficient Flow Insufficient Flow 5/5/2005 150 144 4/19/2005 124 119 4/19/05 (dup) 118 113

7/28/2004 Insufficient Flow 6/7/2004 81.7 5/19/2004 83.4 4/16/2004 91.7 3/30/2004 89.8 2/3/2004 51.7 1/27/2004 80.6 12/5/2003 21.9 11/7/2003 29.1 10/22/2003 36.2 9/22/2003 37.5 8/13/2003 38.6 7/24/2003 39.7 6/13/2003 30.5 5/19/2003 88.8 4/30/2003 131 3/28/2003 88.5 2/26/2003 69 1/29/2003 88.4 12/30/2002 56.9 11/21/2002 64.6 10/30/2002 81.7 9/30/2002 Insufficient Flow 8/30/2002 Insufficient Flow 7/31/2002 Insufficient Flow 7/1/2002 Insufficient Flow 6/28/2002 Insufficient Flow 5/28/2002 30.9 4/24/2002 41 3/25/2002 71.6 2/25/2002 43.9 1/28/2002 41.6 12/12/2001 Insufficient Flow 10/3/2000 31.5 12/29/1999 66 5/19/1998 17 4/9/1996 86 OUTLET 003 9/20/2010 Insufficient Flow Insufficient Flow 8/16/2010 Insufficient Flow Insufficient Flow 7/13/2010 1 0.99 6/9/2010 5.8 5.6 5/3/2010 3 2.9 3/15/2010 7.5 7.2 2/22/2010 2.3 2.2 1/18/2010 2.6 2.5 12/3/2009 2.6 2.4 11/17/2009 Insufficient Flow Insufficient Flow 10/9/2009 3.1 3

11/3/10 Page 3 of 13 Table 5.11

### Table 5.11 Dry Run Landfill APFO and PFOA in Surface Water Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA** ug/L Active Sampling Locations

9/26/2009 2 1.9 9/20/2009 1.6 1.5 7/23/2009 17 16 6/4/2009 2.8 2.7

6/4/09 2.8 2.7 5/26/09 4.5 4.3 5/4/09 1.9 1.8 4/3/09 3 2.9 3/26/2009 5.5 5.3 2/11/2009 2.5 2.4 1/7/2009 1.5 1.4 12/1/2008 3.6 3.6 11/15/2008 2.4 2.3

9/9/2008 Insufficient Flow Insufficient Flow 8/27/2008 1.2 1.2 7/27/2008 10 9.8 6/4/2008 1.2 1.2 5/9/2008 5.2 5 4/28/2008 11 11 3/4/2008 2.2 2.1 2/4/2008 6.7 6.4 1/7/2008 8 7.7 12/3/2007 6.2 5.9 11/15/2007 4.7 4.5 10/24/2007 3 2.9 9/11/2007 2.5 2.4 8/22/2007 1.2 1.2 8/17/2007 Insufficient Flow Insufficient Flow 8/16/2007 Insufficient Flow Insufficient Flow 7/27/2007 Insufficient Flow Insufficient Flow 6/19/2007 16 15 6/14/2007 dry dry 6/6/2007 dry dry 5/16/2007 dry dry 5/15/2007 dry dry 4/27/2007 10 10 4/12/2007 10 9.8 3/15/2007 9.4 9.2 2/21/2007 25 24 1/5/2007 21 20 12/22/2006 12 12 11/13/2006 11 11 10/11/2006 Insufficient Flow Insufficient Flow 10/5/2006 20 19 9/7/2006 17 16 8/31/2006 10 9.6 7/13/2006 14 13 6/26/2006 13.8 13.3 5/11/2006 32.6 31.3 4/7/2006 35.9 34.5 3/14/2006 29.6 28.4 2/23/2006 Insufficient Flow Insufficient Flow 2/15/2006 Insufficient Flow Insufficient Flow 1/30/2006 Insufficient Flow Insufficient Flow

11/3/10 Page 4 of 13 Table 5.11

### Table 5.11 Dry Run Landfill APFO and PFOA in Surface Water Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA** ug/L Active Sampling Locations

1/19/2006 Insufficient Flow Insufficient Flow 12/16/2005 35.2 33.8 11/9/2005 36.6 35.2 10/7/2005 14.7 14.1 9/26/2005 dry dry 8/26/2005 13.1 12.6 8/18/2005 9.65 9.27 7/18/2005 Insufficient Flow Insufficient Flow 6/29/2005 Insufficient Flow Insufficient Flow 5/20/2005 24.4 23.5 7/28/2004 Insufficient Flow 6/7/2004 Insufficient Flow 5/19/2004 20.2 4/16/2004 24.8 3/30/2004 14.7 2/3/2004 9.55 1/27/2004 18.4 12/5/2003 10.4 11/7/2003 18.4 10/22/2003 Insufficient Flow 9/22/2003 16.1 8/13/2003 Insufficient Flow 7/24/2003 27.6 6/13/2003 10.3 5/31/2003 Insufficient Flow 4/30/2003 Insufficient Flow 3/31/2003 Insufficient Flow 2/28/2003 Insufficient Flow 1/31/2003 Insufficient Flow 12/30/2002 Insufficient Flow 11/30/2002 Insufficient Flow 10/30/2002 Insufficient Flow 9/30/2002 Insufficient Flow 8/30/2002 Insufficient Flow 7/1/2002 25.3 6/28/2002 Insufficient Flow 5/28/2002 Insufficient Flow 4/29/2002 20.1 3/26/2002 6.77 2/25/2002 Insufficient Flow 1/28/2002 Insufficient Flow 12/12/2001 Insufficient Flow OUTLET 004 9/20/2010 Insufficient Flow Insufficient Flow 8/16/2010 Insufficient Flow Insufficient Flow 7/13/2010 0.79 0.76 6/9/2010 0.74 0.71 5/3/2010 2 1.9 3/15/2010 1.5 1.4 2/5/2010 0.64 0.61 1/18/2010 1.6 1.6 12/3/2009 1.9 1.8 11/17/2009 Insufficient Flow Insufficient Flow 10/9/2009 0.59 0.57 9/26/2009 1.1 1.1

11/3/10 Page 5 of 13 Table 5.11

### Table 5.11 Dry Run Landfill APFO and PFOA in Surface Water Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA** ug/L Active Sampling Locations

8/20/2009 1.4 1.3 7/23/2009 1 0.98

6/4/09 1.9 1.8 5/26/09 1.7 1.6 5/4/09 1.4 1.3 4/3/09 2.9 2.8 3/26/2009 1.9 1.8 2/11/2009 2.6 2.5 1/7/2009 1.5 1.4 12/1/2008 2.2 2.1 11/15/2008 1 1

9/9/2008 Insufficient Flow Insufficient Flow 8/27/2008 1.2 1.2 7/27/2008 1.9 1.8 6/4/2008 1.1 1.1 5/9/2008 2.6 2.5 4/28/2008 2.5 2.4 3/4/2008 3.4 3.3 2/4/2008 4.8 4.6 1/7/2008 50 48 12/3/2007 8.1 7.8 11/15/2007 9.4 9 10/24/2007 2 1.9 9/11/2007 2.5 2.4 8/22/2007 3.1 3 8/17/2007 Insufficient Flow Insufficient Flow 8/16/2007 Insufficient Flow Insufficient Flow 7/27/2007 3.7 3.6 6/19/2007 2.9 2.8 6/14/2007 dry dry 6/6/2007 dry dry 5/16/2007 dry dry 5/15/2007 dry dry 4/27/2007 Insufficient Flow Insufficient Flow 4/12/2007 22 21 3/15/2007 11 11 2/21/2007 16 15 1/5/2007 15 14 12/22/2006 15 14 11/16/2006 53 51 11/13/2006 Insufficient Flow Insufficient Flow 10/11/2006 Insufficient Flow Insufficient Flow 10/5/2006 25 24 9/21/2006 7.2 6.9 8/31/2006 2.5 2.4 7/11/2006 Insufficient Flow Insufficient Flow 6/27/2006 4.37 4.19 5/11/2006 9.92 9.53 4/7/2006 11 10.6 3/14/2006 95.4 91.6 2/23/2006 Insufficient Flow Insufficient Flow 2/15/2006 frozen frozen 1/30/2006 Insufficient Flow Insufficient Flow 1/19/2006 Insufficient Flow Insufficient Flow

11/3/10 Page 6 of 13 Table 5.11

### Table 5.11 Dry Run Landfill APFO and PFOA in Surface Water Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA** ug/L Active Sampling Locations

12/16/2005 7.86 7.55 11/9/2005 24.1 23.2 10/7/2005 2.27 2.18 9/26/2005 Insufficient Flow Insufficient Flow 8/26/2005 2.83 2.72 8/18/2005 0.673 0.646 7/18/2005 Insufficient Flow Insufficient Flow 6/29/2005 Insufficient Flow Insufficient Flow 5/20/2005 0.336 0.323 7/28/2004 0.304 6/7/2004 0.533 5/19/2004 0.416 4/16/2004 0.422 3/30/2004 0.539 2/3/2004 17.5 1/27/2004 Insufficient Flow 12/5/2003 0.398 11/7/2003 0.356 10/22/2003 Insufficient Flow 9/22/2003 0.354 8/13/2003 Insufficient Flow 7/24/2003 0.243 6/13/2003 0.461 5/19/2003 0.543 4/30/2003 Insufficient Flow 3/31/2003 Insufficient Flow 2/28/2003 Insufficient Flow 1/31/2003 Insufficient Flow 12/30/2002 Insufficient Flow 11/30/2002 Insufficient Flow 10/30/2002 Insufficient Flow 9/30/2002 Insufficient Flow 8/30/2002 Insufficient Flow 7/1/2002 0.7 6/28/2002 Insufficient Flow 5/28/2002 Insufficient Flow 4/27/2002 Insufficient Flow 3/26/2002 158 2/25/2002 Insufficient Flow 1/28/2002 Insufficient Flow 12/12/2001 Insufficient Flow LM1 (LM1 LEACHATE; 8/16/2010 64 61 DRLEACHATE) 4/6/2010 55 53 1/14/2010 43 41 10/14/2009 34 33 8/31/2009 57 55

6/1/09 33 32 2/11/2009 64 61 11/20/2008 45 43 8/15/2008 54 52 4/30/2008 45 43 1/7/2008 72 69 12/12/2007 67 64

8/3/2007 57 55

11/3/10 Page 7 of 13 Table 5.11

### Table 5.11 Dry Run Landfill APFO and PFOA in Surface Water Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA** ug/L Active Sampling Locations

6/14/2007 41 39 2/1/2007 72 69 12/7/2006 65 62 9/14/2006 58 56 6/12/2006 64.4 61.8 2/23/2006 124 119 11/9/2005 119 114 9/28/2005 109 105 9/28/05 (dup) 80.8 77.6

6/15/2005 86.2 5/18/2005 155 5/11/2005 157 5/5/2005 109 4/19/2005 119 5/20/2003 135 3/28/2003 99.7 10/30/2002 704 5/28/2002 150 4/24/2002 237 3/25/2002 334 2/25/2002 256 1/28/2002 398 12/12/2001 109 10/3/2000 27.4 12/29/1999 34 5/19/1998 56 7/22/1997 62 LM2 (LM2 LEACHATE; 9/20/2010 4.6 4.4 DRLEACHATE) 8/16/2010 4.1 3.9 7/13/2010 4.3 4.1 6/22/2010 5.1 4.9 5/11/2010 3.3 3.2 4/2/2010 5.1 4.9 3/3/2010 6.8 6.5 2/18/2010 7.7 7.4 1/14/2010 4.6 4.4 12/3/2009 4.7 4.6 11/17/2009 4.6 4.4 10/14/2009 0.79 0.76 9/21/2009 6.5 6.2 8/4/2009 1.4 1.3 7/6/2009 4.9 4.7 6/1/09 5.2 5 5/6/09 7.3 7 4/6/09 11 11 3/3/2009 8.3 8 2/2/2009 3.6 3.5 1/19/2009 6 5.8 12/1/2008 5.3 5.1 11/17/2008 4.1 3.9 10/9/2008 47 45 9/16/2008 22 21 8/18/2008 6.6 6.3 7/29/2008 4.6 4.4

11/3/10 Page 8 of 13 Table 5.11

### Table 5.11 Dry Run Landfill APFO and PFOA in Surface Water Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA** ug/L Active Sampling Locations

6/18/2008 6.2 6 5/12/2008 4.9 4.7 4/30/2008 14 13 3/12/2008 10 9.9 2/4/2008 9.9 9.7 1/7/2008 17 16 12/27/2007 10 10 11/15/2007 14 13 10/24/2007 7.1 6.8 9/20/2007 7.2 6.9 9/20/07 (dup) 7.3 7 8/3/2007 & & 7/2/2007 70 67 6/14/2007 74 71 5/15/2007 100 96 4/27/2007 110 110 SS-1 (STREAM SAMPLING 9/20/2010 Insufficient Flow Insufficient Flow POINT#1) 8/16/2010 0.97 0.93 7/13/2010 1 1 6/22/2010 1 1 5/11/2010 1.1 1.1 4/2/2010 0.68 0.65 3/3/2010 0.62 0.6 2/18/2010 0.61 0.59 1/14/2010 0.46 0.44 12/3/2009 0.86 0.83 11/17/2009 Insufficient Flow Insufficient Flow 10/14/2009 0.58 0.56

8/4/2009 1 1 7/6/2009 1.4 1.3

6/1/09 0.88 0.85 5/6/09 0.71 0.68 4/6/09 0.81 0.78 3/3/2009 0.58 0.56 2/2/2009 0.61 0.59 1/19/2009 Insufficient Flow Insufficient Flow 12/1/2008 0.93 0.89 11/17/2008 0.64 0.61 9/16/2008 Insufficient Flow Insufficient Flow 8/18/2008 Insufficient Flow Insufficient Flow 7/29/2008 1 0.97 6/18/2008 1 0.98 5/12/2008 0.92 0.88 4/8/2008 0.66 0.63 3/12/2008 0.76 0.73 2/4/2008 1.2 1.2 1/7/2008 4 3.8 12/27/2007 2 1.9 11/15/2007 1.6 1.5 10/24/2007 1 1 9/20/2007 dry dry 7/2/2007 1.7 1.6 6/14/2007 1.6 1.5 5/15/2007 0.087 0.084

11/3/10 Page 9 of 13 Table 5.11

### Table 5.11 Dry Run Landfill APFO and PFOA in Surface Water Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA** ug/L Active Sampling Locations

4/27/2007 1.5 1.4 3/14/2007 36 35 2/21/2007 1.5 1.4 1/4/2007 0.97 0.93 12/7/2006 0.96 0.92 11/13/2006 0.96 0.92 10/5/2006 1.7 1.6 9/7/2006 1.4 1.3 8/31/2006 0.93 0.89 7/11/2006 1.8 1.7 6/8/2006 1.36 1.31 5/4/2006 1.39 1.33 4/7/2006 1.86 1.79 3/14/2006 3.33 3.2 2/15/2006 1.03 0.987 1/19/2006 1.11 1.07 12/13/2005 0.906 0.87 11/9/2005 3.27 3.14 10/7/2005 1.99 1.91 9/27/2005 2.03 1.95 8/26/2005 1.53 1.47 7/1/2005 1.71 1.64 6/15/2005 1.83 1.74 5/5/2005 1.51 1.45 4/19/2005 1.39 1.33 5/19/2003 1.13 3/28/2003 1.24 10/30/2002 1.63 8/30/2002 Insufficient Flow 5/28/2002 1.63 4/24/2002 0.932 3/25/2002 1.06 2/25/2002 0.85 1/28/2002 0.893 12/12/2001 1.19 10/3/2000 0.758 12/29/1999 0.54 5/19/1998 1 SS-2 (STREAM SAMPLING 9/20/2010 0.66 0.63 POINT#2) 8/16/2010 0.76 0.73 7/13/2010 0.93 0.89 6/22/2010 0.19 0.18 5/11/2010 0.62 0.6 4/2/2010 1 0.98 3/3/2010 0.29 0.28 2/18/2010 2.6 2.5 1/14/2010 0.99 0.95 12/3/2009 0.29 0.28 11/17/2009 0.066 0.063 10/14/2009 0.061 0.059 9/21/2009 0.021 0.02 9/21/2009 (dup) 0.023 0.022 8/4/2009 0.048 0.046 7/6/2009 0.62 0.6

11/3/10 Page 10 of 13 Table 5.11

### Table 5.11 Dry Run Landfill APFO and PFOA in Surface Water Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA** ug/L Active Sampling Locations

7/6/2009 (dup) 0.61 0.59 6/1/09 0.67 0.64 5/6/09 0.17 0.16 4/6/09 1.5 1.4 3/3/2009 1.5 1.4 2/2/2009 1.1 1.1 1/19/2009 1 1 12/1/2008 0.73 0.7 11/17/2008 0.069 0.066 10/9/2008 0.8 0.77 9/16/2008 0.36 0.35 8/18/2008 0.048 0.046 7/29/2008 2.1 2 7/29/08 (dup) 2.1 2

6/18/2008 0.64 0.61 5/12/2008 1.2 1.2 4/8/2008 1.6 1.5 3/12/2008 2.6 2.5 2/4/2008 3.2 3.1 1/7/2008 2.8 2.7 12/27/2007 7.9 7.6 11/15/2007 0.36 0.35 10/24/2007 0.98 0.94 9/20/2007 0.2 0.19 7/2/2007 0.5 0.48 6/14/2007 0.46 0.44 5/15/2007 0.083 0.08 4/27/2007 0.41 0.39 3/14/2007 75 72 2/21/2007 9.6 9.2 1/4/2007 34 33 1/4/07 (dup) 36 35

12/7/2006 29 28 11/13/2006 12 12 10/5/2006 6.6 6.3 9/7/2006 35 34 8/31/2006 11 11 7/11/2006 40 38 6/8/2006 38 36.5 5/4/2006 55.4 53.2 4/7/2006 11.3 10.9 4/7/06 (dup) 10.8 10.4

3/14/2006 29 27.9 2/15/2006 28.6 27.5 1/19/2006 25.3 24.3 12/13/2005 23.1 22.2 11/9/2005 28.7 27.6 10/7/2005 21 20.2 9/27/2005 5.31 5.1 8/26/2005 9.44 9.07 7/1/2005 19.1 18.3 6/15/2005 28.7 27.5 6/15/05 (dup) 27.2 26.1 5/5/2005 73.5 70.6

11/3/10 Page 11 of 13 Table 5.11

### Table 5.11 Dry Run Landfill APFO and PFOA in Surface Water Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA** ug/L Active Sampling Locations

4/19/2005 65.7 63.1 5/19/2003 17.4 3/28/2003 61.1 10/30/2002 29.2 8/20/2002 Insufficient Flow 5/28/2002 51 4/24/2002 28.9 3/25/2002 66.6 2/25/2002 24.3 1/28/2002 42.4 12/12/2001 20.5 10/3/2000 27.6 12/29/1999 87 5/19/1998 4.6 PROPERTY BOUNDARY 10/5/2006 1.4 1.3 9/14/2006 3.6 3.5 7/11/2006 5.8 5.6 6/8/2006 6.32 6.07 5/4/2006 10.5 10.1 1/19/2006 3.67 3.53 12/13/2005 3.35 3.22 11/9/2005 4.55 4.37 10/7/2005 13.4 12.9 8/31/2005 5.16 4.96 7/18/2005 10.5 10 5/19/2003 2.97 3/28/2003 11.3 10/30/2002 3.8 8/30/2002 Insufficient Flow 5/28/2002 9.41 4/24/2002 6.69 3/25/2002 22.8 2/25/2002 3.81 1/28/2002 11.1 12/12/2001 3.99 10/3/2000 10.3 12/29/1999 39 7/14/1998 0.88 4/9/1996 9.9 Raw Sump ^ 3/5/2007 86 83 Finish Water ^ 3/5/2007 NQ (<0.0051) NQ (<0.0051) Sediment Bag Discharge ^ 3/14/2007 78 75 Pond Overflow 6/4/2008 3.7 3.6 Pond Overflow 3/19/2008 8.2 7.9 Pond Overflow 12/13/2007 9.2 8.8 Pond Overflow 12/10/2007 9.2 8.8 Pond Overflow 12/3/2007 12 12

11/3/10 Page 12 of 13 Table 5.11

### Table 5.11 Dry Run Landfill APFO in Surface Water Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA ** (ug/L) DOWN STREAM 6/22/2005 6.54 DOWN STREAM 4/9/1996 25 N. OR DRL (BEAMAN) 8/18/2005 0.55 0.528 W. SW DITCH 8/18/2005 9.21 8.85 POND RAMP 8/18/2005 60.6 58.2 LEACHATE 2 (above the pond in the sump hole) 7/13/2005 0.0945 0.0908

OUTLET 005 (POND 3/14/2007 42 40 UNDERDRAIN)@ 2/21/2007 17 16 1/4/2007 40 38 12/7/2006 29 28 11/13/2006 29 28 10/5/2006 16 15 9/7/2006 34 33 8/31/2006 42 40 8/2/2006 56 54 7/11/2006 50 48 6/8/2006 64.1 61.6 5/4/2006 66.1 63.5 4/7/2006 56.3 54.1 3/14/2006 29.8 28.6 2/15/2006 48 46.1 2/15/06 (dup) 50.3 48.3

1/19/2006 26.4 25.4 12/13/2005 34.5 33.1 11/9/2005 35 33.6 10/7/2005 58.9 56.6 9/27/2005 60.6 58.2 8/18/2005 65.6 63 7/5/2005 38.4 36.9 6/15/2005 41.5 39.9 5/5/2005 41.4 39.8 4/19/2005 51.6 49.5 5/19/2003 48.7 3/28/2003 53.3 10/30/2002 38.8 5/28/2002 67.4 4/24/2002 33.4 3/25/2002 66.7 2/25/2002 37.1 1/28/2002 29.3 12/12/2001 35.4

Note: Analytical method changed as of November 2001 (see Section 2.0 for details). *APFO is also known as C-8 or FC-143. ** Both APFO and PFOA are reported starting with analyses performed after December 1, 2004. ^ Samples collected during GAC Treatment system construction. @ Outlet 001 was converted into Outlet 006 in March 2007. Outlet 005 was combined with Outlet 001 in March 2007, but Outlet 005 can still be used as a bypass, if needed. & Samples not collected due to pond O&M activities. Historic Sampling Locations

11/3/10 Page 13 of 13 Table 5.11

## Table 5.12 Dry Run Landfill APFO and PFOA in Groundwater Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA** (ug/L)

MW-6A (DRMW-6A) 7/14/2010 0.99 0.95 4/7/2010 0.85 0.82 1/13/2010 0.58 0.56 10/21/2009 1.1 1.1 7/15/2009 1.4 1.3

4/17/09 0.98 0.94 1/12/2009 0.87 0.84 10/21/2008 1.1 1.1 7/16/2008 0.95 0.91 4/21/2008 0.76 0.73 1/11/2008 0.76 0.73 10/5/2007 1.6 1.5 7/18/2007 1.6 1.5 4/11/2007 1.1 1.1 1/11/2007 1.2 1.2 10/12/2006 1.8 1.7 7/13/2006 1.76 1.69 4/5/2006 1.39 1.33 1/11/2006 1.15 1.1 10/4/2005 2.61 2.51 7/12/2005 1.6 1.54 5/2/2005 1.18 1.13 1/25/2005 0.856 0.822 11/11/2004 2.91 8/10/2004 2.29 8/10/04 (dup) 2.25

5/27/2004 1.37 2/16/2004 0.964 12/3/2003 0.891 8/20/2003 1.63 5/14/2003 1.59 2/27/2003 0.727 10/9/2002 1.13 8/28/2002 0.785 5/22/2002 1.24 3/30/2002 0.843 2/20/2002 0.822 1/27/2002 0.824 12/12/2001 1.05 12/12/01 (dup) 1.03

7/20/2000 0.212 7/21/1999 0.096 5/26/1998 0.27 7/22/1997 0.36 4/10/1996 0.19 MW-12A (DRMW-12A) 7/16/2010 0.1 0.1 4/6/2010 0.1 0.1 1/12/2010 0.081 0.078 10/20/2009 0.14 0.13 7/14/2009 0.1 0.1

4/15/09 0.1 0.1 1/14/2009 0.12 0.12 10/22/2008 0.14 0.13 Active Sampling Locations

Overburden

11/3/10 Page 1 of 11 Table 5.12

## Table 5.12 Dry Run Landfill APFO and PFOA in Groundwater Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA** (ug/L) Active Sampling Locations

7/17/2008 0.11 0.11 4/21/2008 0.1 0.098 1/10/2008 0.17 0.16 10/4/2007 0.12 0.12 7/17/2007 0.099 0.095 4/10/2007 0.077 0.074 1/11/2007 0.083 0.08 10/10/2006 0.12 0.12 7/13/2006 0.081 0.0778 4/4/2006 0.103 0.0985 1/11/2006 0.0813 0.0781 10/5/2005 0.13 0.125 7/12/2005 0.0868 0.0834 5/2/2005 0.0843 0.081 1/25/2005 0.0656 0.063 11/11/2004 0.134 8/10/2004 0.116 5/27/2004 0.0616 2/16/2004 NQ (<0.05) 12/3/2003 0.0587 12/3/03 (dup) 0.0689

8/20/2003 0.0612 5/13/2003 0.0547 2/27/2003 0.059 10/9/2002 0.181 8/28/2002 0.088 5/22/2002 0.0832 3/30/2002 0.0785 2/20/2002 0.125 2/20/02 (dup) 0.115

1/25/2002 0.168 12/12/2001 0.158 7/19/2000 0.128 7/21/1999 0.081 J 5/26/1998 <0.10 7/22/1997 <0.1 4/10/1996 <0.1 MW-12B (DRMW-12B) 7/16/2010 0.12 0.12 4/6/2010 0.12 0.12 1/12/2010 0.17 0.16 10/20/2009 0.12 0.12 7/14/2009 0.12 0.12

4/15/09 0.11 0.11 1/14/2009 0.1 0.099 10/22/2008 0.14 0.13 7/17/2008 0.1 0.1 4/21/2008 0.085 0.082 1/10/2008 0.14 0.13 10/4/2007 0.1 0.096 7/17/2007 0.088 0.085 4/10/2007 0.1 0.097 1/11/2007 0.13 0.12 10/10/2006 0.1 0.1 7/13/2006 0.0869 0.0835

11/3/10 Page 2 of 11 Table 5.12

## Table 5.12 Dry Run Landfill APFO and PFOA in Groundwater Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA** (ug/L) Active Sampling Locations

4/4/2006 0.132 0.127 1/11/2006 0.0893 0.0858 10/5/2005 0.141 0.135 7/12/2005 0.0865 0.0831 5/2/2005 0.106 0.100 1/25/2005 0.0797 0.0782 11/11/2004 0.136 8/10/2004 0.126 5/27/2004 0.0708 5/27/04 (dup) 0.0691

2/16/2004 0.092 12/3/2003 0.0871 8/20/2003 0.0699 8/20/03 (dup) 0.0686

5/13/2003 0.0649 2/27/2003 0.05 2/27/03 (dup) 0.052

10/9/2002 0.258 10/9/02 (dup) 0.242

8/28/2002 NQ (<0.05) 5/22/2002 NQ (<0.05) 3/30/2002 NQ (<0.05) 3/30/02 (dup) NQ (<0.05)

2/20/2002 NQ (<0.05) 1/25/2002 0.073 1/25/02 (dup) 0.085

12/12/2001 0.215 7/20/2000 ND (0.029) 7/21/1999 5.4 6/16/1998 <0.1 MW-13A (DRMW-13A) 7/16/2010 2.2 2.1 4/6/2010 1.1 1.1 1/12/2010 0.87 0.84 10/20/2009 2.3 2.2 7/14/2009 2 1.9

4/16/09 2.1 2 1/14/2009 2.1 2 10/21/2008 5.2 5 7/16/2008 1.5 1.4 4/22/2008 1.2 1.2 1/10/2008 2.1 2 10/4/2007 6.7 6.4 7/18/2007 2.9 2.8 4/10/2007 1.9 1.8 1/11/2007 2.2 2.1 10/10/2006 3.5 3.4 7/13/2006 3.32 3.19 4/4/2006 4.58 4.4 1/11/2006 3.31 3.18 10/4/2005 6.53 6.27 7/11/2005 2.92 2.8 5/2/2005 1.9 1.82 1/25/2005 1.57 1.51 11/11/2004 10.3

11/3/10 Page 3 of 11 Table 5.12

## Table 5.12 Dry Run Landfill APFO and PFOA in Groundwater Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA** (ug/L) Active Sampling Locations

8/10/2004 5.05 5/27/2004 2.16 2/16/2004 1.48 12/3/2003 2.35 8/20/2003 4.38 5/13/2003 3.23 2/27/2003 1.5 10/9/2002 6.66 8/28/2002 5.14 5/22/2002 2.31 3/30/2002 4 2/20/2002 3.73 1/25/2002 5.97 12/12/2001 6.4 7/20/2000 9.9 7/21/1999 0.070 J 5/26/1998 8.7 7/22/1997 15 4/10/1996 8.2 4/10/1996 (dup) 11 MW-21A (DRMW-21A) 7/14/2010 0.33 0.32 4/7/2010 0.25 0.24 4/7/2010 (dup) 0.27 0.26 1/13/2010 0.16 0.15 1/13/2010 (dup) 0.14 0.13 10/21/2009 0.22 0.21 10/21/2009 (dup) 0.23 0.22 7/14/2009 0.20 0.19 7/14/09 (dup) 0.21 0.20 4/16/09 0.23 0.22 1/13/2009 0.19 0.18 1/13/09 (dup) 0.17 0.16

10/22/2008 0.18 0.17 10/22/08 (dup) 0.18 0.17

7/16/2008 0.23 0.22 7/16/08 (dup) 0.24 0.23

4/22/2008 0.28 0.27 1/9/2008 0.17 0.16 10/4/2007 0.15 0.14 7/17/2007 0.16 0.15 4/11/2007 0.26 0.25 1/11/2007 0.25 0.24 10/10/2006 0.31 0.3 10/10/06 (dup) 0.32 0.31

7/13/2006 0.221 0.212 7/13/06 (dup) 0.213 0.205 4/4/2006 0.217 0.208 4/4/06 (dup) 0.224 0.215

1/10/2006 0.281 0.27 10/4/2005 0.253 0.243 7/11/2005 0.161 0.155 4/29/2005 0.3 0.288 8/21/2003 0.157 5/16/2003 0.37

11/3/10 Page 4 of 11 Table 5.12

## Table 5.12 Dry Run Landfill APFO and PFOA in Groundwater Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA** (ug/L) Active Sampling Locations

2/28/2003 0.138 10/9/2002 0.27

MW-16B (DRMW-16B) 7/13/2010 NQ (<0.012) NQ (<0.012) 4/5/2010 NQ (<0.019) NQ (<0.019) 1/11/2010 NQ (<0.018) NQ (<0.018) 10/19/2009 NQ (<0.01) NQ (<0.01) 7/13/2009 0.017 0.016

4/14/09 0.015 0.014 1/12/2009 0.014 0.013 10/21/2008 0.016 0.015 7/15/2008 NQ (<0.012) NQ (<0.012) 4/21/2008 0.031 0.03 1/9/2008 0.045 0.043 10/3/2007 NQ (<0.016) NQ (<0.016) 7/16/2007 0.031 0.03 4/9/2007 0.097 0.093 1/10/2007 0.11 0.11 10/12/2006 0.15 0.14 7/12/2006 0.13 0.125 4/3/2006 0.0788 0.0757 1/10/2006 0.0811 0.0779 10/3/2005 0.168 0.161 7/11/2005 0.172 0.165 4/26/2005 0.294 8/22/2003 NQ (<0.05) 5/16/2003 NQ (<0.05) 2/28/2003 ND (<0.01) 10/8/2002 NQ (<0.05) MW-17B (DRMW-17B) 7/13/2010 0.04 0.038 4/5/2010 0.041 0.039 1/11/2010 0.028 0.027 10/19/2009 0.037 0.036 7/13/2009 0.035 0.034

4/14/09 0.039 0.037 1/12/2009 0.036 0.035 10/21/2008 0.041 0.039 7/15/2008 0.029 0.028 4/21/2008 0.035 0.034 1/9/2008 0.042 0.04 10/3/2007 0.039 0.037 7/16/2007 0.046 0.044 4/9/2007 0.048 0.046 1/10/2007 0.036 0.035 10/12/2006 0.064 0.061 7/12/2006 0.0761 0.0731 4/3/2006 0.0786 0.0755 1/10/2006 0.0592 0.0569 10/3/2005 0.0879 0.0844 7/11/2005 0.0687 0.066 4/26/2005 0.0736 8/21/2003 NQ (<0.05) 3/3/2003 Not Sampled*** 10/8/2002 0.155 A-Zone Wells

11/3/10 Page 5 of 11 Table 5.12

## Table 5.12 Dry Run Landfill APFO and PFOA in Groundwater Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA** (ug/L) Active Sampling Locations

MW-18B (DRMW-18B) 7/13/2010 NQ (<0.012) NQ (<0.012) 4/5/2010 NQ (<0.019) NQ (<0.019) 1/11/2010 NQ (<0.018) NQ (<0.018) 10/19/2009 NQ (<0.01) NQ (<0.01) 7/13/2009 NQ (<0.013) NQ (<0.013)

4/14/09 NQ (<0.013) NQ (<0.013) 1/12/2009 NQ (<0.013) NQ (<0.013) 10/20/2008 0.014 0.013 7/15/2008 NQ (<0.012) NQ (<0.012) 4/22/2008 NQ (<0.0096) NQ (<0.0096) 1/9/2008 0.012 0.012 10/3/2007 NQ (<0.016) NQ (<0.016) 7/16/2007 0.0087 0.0084 4/9/2007 NQ (<0.013) NQ (<0.013) 1/10/2007 0.0065 0.0062 10/11/2006 0.023 0.022 7/12/2006 NQ (<0.013) NQ (<0.05) 4/3/2006 0.0119 0.0114 1/10/2006 0.0153 0.0147 10/3/2005 0.0173 0.0165 7/11/2005 0.0125 0.012 4/29/2005 NQ (<0.05) 4/29/05 (dup) NQ (<0.05)

8/21/2003 NQ (<0.05) 5/15/2003 NQ (<0.05) 3/3/2003 Not Sampled*** 10/7/2002 ND (<0.01) MW-19B (DRMW-19B) 7/13/2010 NQ (<0.012) NQ (<0.012) 7/13/2010 (dup) NQ (<0.012) NQ (<0.012) 4/5/2010 NQ (<0.019) NQ (<0.019) 1/11/2010 NQ (<0.018) NQ (<0.018) 10/19/2009 0.011 0.011 7/13/2009 0.02 0.019

4/14/09 0.014 0.013 1/12/2009 0.015 0.014 10/20/2008 0.011 0.011 7/15/2008 NQ (<0.012) NQ (<0.012) 4/22/2008 0.012 0.012 1/9/2008 0.014 0.013 10/3/2007 NQ (<0.016) NQ (<0.016) 7/17/2007 0.02 0.019 4/9/2007 0.017 0.016 4/9/07 (dup) 0.028 0.027 1/10/2007 0.016 0.015 10/11/2006 0.019 0.018 7/12/2006 0.0148 0.0142 4/3/2006 0.0225 0.0216 1/10/2006 0.0197 0.0189 10/3/2005 0.0332 0.0319 7/11/2005 0.0201 0.0193 4/26/2005 NQ (<0.05) 8/21/2003 NQ (<0.05) 5/15/2003 NQ (<0.05) 2/28/2003 NQ (<0.05)

11/3/10 Page 6 of 11 Table 5.12

## Table 5.12 Dry Run Landfill APFO and PFOA in Groundwater Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA** (ug/L) Active Sampling Locations

10/7/2002 NQ (<0.05) MW-20B (DRMW-20B) 7/14/2010 0.023 0.022 4/5/2010 0.028 0.027 1/11/2010 NQ (<0.018) NQ (<0.018) 10/19/2009 0.027 0.026 7/13/2009 0.042 0.04

4/17/09 0.032 0.031 1/12/2009 0.03 0.029 10/20/2008 0.029 0.028 7/15/2008 0.021 0.02 4/22/2008 0.028 0.027 1/9/2008 0.044 0.042 10/3/2007 0.032 0.031 7/17/2007 0.045 0.043 4/9/2007 0.05 0.048 1/10/2007 0.04 0.038 10/11/2006 0.064 0.061 7/12/2006 0.0501 0.0481 4/3/2006 0.0641 0.0616 1/10/2006 0.0453 0.0435 1/10/06 (dup) 0.0461 0.0443

10/3/2005 0.0677 0.065 7/11/2005 0.0454 0.0436 4/29/2005 0.0528 4/29/05 (dup) 0.0603

8/22/2003 NQ (<0.05) 5/15/2003 ND (<0.01) 2/28/2003 NQ (<0.05) 10/8/2002 NQ (<0.05)

MW-12 (DRMW-12) 7/16/2010 0.079 0.076 4/6/2010 0.086 0.083 1/12/2010 0.073 0.07 10/20/2009 0.1 0.1 7/14/2009 0.097 0.093

4/15/09 0.1 0.1 1/14/2009 0.097 0.093 10/22/2008 0.081 0.078 7/17/2008 0.035 0.034 4/21/2008 0.082 0.079 1/10/2008 0.075 0.072 1/10/08 (dup) 0.074 0.071

10/4/2007 NQ (<0.016) NQ (<0.016) 7/17/2007 0.067 0.064 4/10/2007 0.075 0.072 1/11/2007 0.077 0.074 10/10/2006 0.078 0.075 7/13/2006 0.0713 0.0685 4/4/2006 0.0955 0.0917 1/11/2006 0.08 0.0769 10/5/2005 0.0959 0.0921 7/12/2005 0.0678 0.0651 7/12/05 (dup) 0.0704 0.0676 5/2/2005 0.0702 0.0674 B-Zone Wells

11/3/10 Page 7 of 11 Table 5.12

## Table 5.12 Dry Run Landfill APFO and PFOA in Groundwater Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA** (ug/L) Active Sampling Locations

1/25/2005 0.0661 0.0635 1/25/05 (dup) 0.0647 0.0621

11/11/2004 0.109 8/10/2004 0.0957 5/27/2004 0.059 2/16/2004 0.0612 2/16/04 dup 0.0657

12/3/2003 0.0606 8/20/2003 0.0586 5/13/2003 0.0714 5/13/03 (dup) 0.0787

2/27/2003 0.101 10/9/2002 0.109 8/28/2002 0.0626 5/22/2002 0.0817 3/30/2002 0.0929 2/20/2002 0.11 1/25/2002 0.116 12/12/2001 0.086 7/19/2000 0.16 7/21/1999 0.134 5/26/1998 <0.10 7/22/1997 <0.1 4/10/1996 <0.1 MW-13 (DRMW-13) 7/16/2010 21 20 4/6/2010 24 23 1/12/2010 21 20 10/20/2009 26 25 7/14/2009 23 22

4/16/09 23 22 1/14/2009 24 23 10/21/2008 25 24 7/16/2008 18 17 4/22/2008 20 19 1/10/2008 23 22 10/4/2007 7.8 7.5 7/18/2007 23 22 4/10/2007 23 22 1/11/2007 23 22 10/10/2006 23 22 7/16/2006 21.7 20.8 4/4/2006 27.5 26.4 1/11/2006 23.4 22.5 10/4/2005 33.9 32.6 7/11/2005 21.6 20.7 5/2/2005 28.3 27.2 1/25/2005 20.5 19.7 11/11/2004 39.0 11/11/04 (dup) 42.9

8/10/2004 33.9 5/27/2004 22.2 2/16/2004 22 12/3/2003 11.1 8/20/2003 17.8

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## Table 5.12 Dry Run Landfill APFO and PFOA in Groundwater Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA** (ug/L) Active Sampling Locations

5/13/2003 22.8 2/27/2003 15 10/9/2002 20.9 8/28/2002 13.1 8/28/02 (dup) 14.6

5/22/2002 16.9 3/30/2002 12.6 2/20/2002 11.5 1/25/2002 16.5 12/12/2001 9.86 7/20/2000 9.8 7/21/1999 3.6 5/26/1998 9.2 7/22/1997 7 MW-15 (DRMW-15) 7/14/2010 3.6 3.5 4/7/2010 4.3 4.1 1/13/2010 3.4 3.3 10/21/2009 3.6 3.5 7/15/2009 4.3 4.1

4/17/09 4.9 4.7 4/17/2009 (dup) 4.1 3.9 1/13/2009 4.3 4.1 10/21/2008 3.7 3.6 7/16/2008 0.67 0.64 4/21/2008 3.5 3.4 1/11/2008 4.4 4.2 10/5/2007 3.6 3.5 10/5/07 (dup) 3.2 3.1

7/18/2007 4.2 4 7/18/07 (dup) 3.7 3.6

4/11/2007 4.1 3.9 1/11/2007 4.3 4.1 1/11/2007 (dup) 3.1 3 10/12/2006 4.8 4.6 7/13/2006 4.29 4.12 4/5/2006 5.18 4.98 1/11/2006 4.84 4.65 10/4/2005 5.84 5.61 10/4/05 (dup) 7.43 7.14

7/12/2005 4.84 4.65 4/26/2005 5.45 5.23 1/25/2005 4.02 3.86 11/11/2004 7.94 8/10/2004 7.04 5/27/2004 3.27 2/16/2004 4.59 12/3/2003 3.05 8/20/2003 4.77 5/14/2003 4.55 3/3/2003 4.64 10/15/2002 4.92 8/28/2002 3.99 5/22/2002 5 5/22/02 (dup) 4.66

11/3/10 Page 9 of 11 Table 5.12

## Table 5.12 Dry Run Landfill APFO and PFOA in Groundwater Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO* (ug/L) PFOA** (ug/L) Active Sampling Locations

3/30/2002 4.91 2/20/2002 3.65 1/27/2002 4.35 12/12/2001 4.94 7/20/2000 0.763 7/21/1999 0.263

MW-14 (DRMW-14) 7/14/2010 0.03 0.029 4/7/2010 0.037 0.035 1/13/2010 0.025 0.024 10/21/2009 0.036 0.035 7/15/2009 0.041 0.039

4/17/09 0.029 0.028 1/13/2009 0.032 0.031 10/20/2008 0.03 0.029 7/15/2008 0.022 0.021 4/22/2008 0.026 0.025 1/11/2008 0.033 0.032 10/5/2007 0.032 0.031 7/18/2007 0.028 0.027 4/11/2007 0.029 0.028 1/11/2007 0.029 0.028 10/11/2006 0.035 0.034 7/13/2006 0.0426 0.0409 4/3/2006 0.0419 0.0402 1/11/2006 0.0285 0.0274 10/4/2005 0.0356 0.0342 7/11/2005 0.0262 0.0252 4/29/2005 NQ (<0.05) NQ (<0.05) 1/25/2005 NQ (<0.05) NQ (<0.05) 11/11/2004 NQ (<0.05) 8/10/2004 NQ (<0.05) 5/27/2004 NQ (<0.05) 2/16/2004 NQ (<0.05) 12/3/2003 NQ (<0.05) 8/20/2003 NQ (<0.05) 5/14/2003 NQ (<0.05) 3/3/2003 NQ (<0.05) 10/15/2002 NQ (<0.05) 8/28/2002 NQ 5/22/2002 NQ 3/30/2002 NQ 2/20/2002 NQ 1/27/2002 NQ 12/12/2001 NQ 7/20/2000 0.115 7/21/1999 2.5 6/16/1998 <0.1 7/21/1997 <0.1 4/10/1996 <0.1 Above A-Zone Wells

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### Table 5.12 Dry Run Landfill APFO in Groundwater

Quarterly MOU Status Report #20 DuPont Washington Works (OPPT-2004-0113)

Sample Date A PFO (ug/L) PFOA ** (ug/L) MW-6 (DRMW-6) 7/22/1997 1 4/10/1996 0.97

MW-21B (DRMW-21B) 8/21/2003 NQ (<0.05) 5/16/2003 NQ (<0.05) 2/28/2003 NQ (<0.05) 10/9/2002 NQ (<0.05)

ND = Not Detected at or above the limit of detection (LOD). The listed LOD is approximate and varies by instrument and over time. NQ = Not Quantifiable. Detected quantification (LOQ). J = estimated value (below laboratory quantitation limit). Note: Analytical method changed as of November 2001 (see Section 2.0 for details). *APFO is also known as C-8 or FC-143

Yellow highlighted cells indicate data that has been corrected or added based on comparison with the electronic database. ** Both APFO and PFOA are reported starting with analysis performed after December 1, 2004. *** No samples were collected for these wells because snow and ice Historic Sampling Locations

C-Zone Wells

11/3/10 Page 11 of 11 Table 5.12