DuPont Corporate Remediation Group 

Chestnut Run Plaza 715-240 

974 Centre Road 

P.O. Box 2915 

Wilmington, DE 19805 

E.I. du Pont de Nemours and Company

October 31, 2014

Carole Petersen, Chief 

U.S. EPA, Region 2 

New Jersey Remediation Branch 

Emergency and Remedial Response Division 

290 Broadway 

New York, NY 10007-1866 

DuPont Chambers Works Complex 

NJPDES-DGW Permit No. NJ0083429 

Off-Site Monitoring for Perfluorinated Compounds Groundwater Results 

Dear Ms. Petersen: 

DuPont has agreed in a letter to the U.S. Environmental Protection Agency (EPA) dated June 17, 

2014, on the EPA and New Jersey Department of Environmental Protection (NJDEP) request to 

conduct an additional sampling event of the 20 off-site monitoring simultaneously with the 

planned July 2014 NJDPES-DGW semi-annual groundwater monitoring event. Samples have 

been analyzed for the same analytes in the additional sampling event of the off-site monitoring 

wells as in the 2010 sampling event for the 20 off-site wells. 

DuPont sampled the wells in July 2014 in accordance with the sampling and analysis plan (SAP). 

The well locations are shown with PFOA results in Figure 1. PFOA was detected at varying 

concentrations ranging from 0.039 micrograms per liter (μg/L) at well CC23-M01A to 0.95 μg/L 

at well G05-M01A (see Table 1). PFNA was detected at varying concentrations ranging from 

0.0013 μg/L at well EE16-M01B to 0.21 μg/L at well S09-M01A (see Table 2 and Figure 2). 

Figure 3 illustrates the new 2014 data along with prior sampling data. 

If you have any questions, please contact me at 302.999.6197. 

Very truly yours, 

Andrew S. Hartten 

Project Director 

Corporate Remediation – NJ 

cc: Sin Kie Tjho, EPA Region 2 

 Edward Lutz, DuPont (Database Link) 

 Allan Motter, NJDEP 

 Linda Range, NJDEP 

 Carole Chatelain, NJDEP 

 File: 509026
Table 1

Summary of Analytical Results

PFOA Monitoring Program

Perfluorooctanic Acid (PFOA)

Second Semester 2014

DuPont Chambers Works

Deepwater, New Jersey

Location G04-M01A II20-M01A O02-M01A P04-M01A R04-M01A R04-M01B R06-M01A S09-M

Sample Date 07/23/2014 07/28/2014 07/23/2014 07/23/2014 07/28/2014 07/28/2014 07/23/2014 07/23/2

Aquifer AAAAAB AA

Analyte Units Sample Type 111111 11

PFOA UG/L 0.95 0.16 0.79 0.65 0.59 0.89 0.67 1.20 

Location Y31-M01A BB31-M01A BB31-M01B CC23-M01A EE16-M01A EE16-M01B OSW-1 OSW

Sample Date 07/25/2014 07/25/2014 07/25/2014 07/28/2014 07/25/2014 07/25/2014 07/28/2014 07/28/2

Aquifer AABAAB BA

Analyte Units Sample Type 111111 11

PFOA UG/L 0.14 0.62 0.50 0.039 0.32 0.27 0.26 0.15 Notes:ND = Non detect at stated reporting limitPFOA = Perfluorooctanoic AcidSample Type 1 = Regular SampleSample Type 2 = Duplicate Sample

Page 1 of 1 
Table 2

Summary of Analytical Results

PFOA Monitoring Program

Perfluorooctanic Compounds

First Semester 2014

DuPont Chambers Works

Deepwater, New Jersey

Location G04-M01A II20-M01A O02-M01A P04-M01A R04-M01A R06-M01A S09-M01A U08-M01A X1

Sample Date 07/23/2014 07/28/2014 07/23/2014 07/23/2014 07/28/2014 07/23/2014 07/23/2014 07/23/2014 07/

Aquifer A AAAAAAA

Analyte Units Sample Type 1 1111111PFBA UG/L 0.32 0.054 0.18 0.23 0.69 0.29 0.25 0.23 PFBS UG/L <0.0052 0.0065 0.009 0.022 0.014 0.0073 0.0052 0.0039 <0PFDA UG/L 0.063 <0.0010 0.027 0.0058 <0.0025 <0.0010 0.0097 0.0012 PFDOA UG/L 0.0075 J 0.0063 0.0019 J <0.00091 <0.0025 <0.0010 <0.0020 UJ <0.0010 <0PFHPA UG/L 0.42 0.18 0.45 0.39 J 1.2 0.40 J 0.39 0.38 PFHXA UG/L 1 0.17 0.63 0.48 J 1.2 0.49 J 0.52 0.41 PFHXS UG/L <0.0044 0.002 <0.0020 <0.0018 <0.013 <0.0023 <0.0041 <0.0020 <0PFNA UG/L 0.16 0.0038 0.17 0.11 0.0055 0.042 0.21 0.19 PFOS UG/L 0.0084 <0.0020 0.012 0.0028 <0.015 <0.0020 <0.0059 0.023 <0PFOSA UG/L <0.0022 <0.0010 <0.0010 <0.00091 <0.0025 <0.0010 <0.0020 <0.0010 <PFPEA UG/L 0.61 0.2 0.42 0.32 J 1.7 0.38 J 0.64 0.42 PFUNA UG/L 0.0067 <0.0010 <0.0010 <0.00091 <0.0025 <0.0010 <0.0020 <0.0010 <

Location BB31-M01A CC23-M01A EE16-M01A R04-M01B BB31-M01B EE16-M01B OSW-1 OSW-2 O

Sample Date 07/25/2014 07/28/2014 07/25/2014 07/28/2014 07/25/2014 07/25/2014 07/28/2014 07/28/2014 07/

Aquifer A AABBBBA

Analyte Units Sample Type 1 1111111PFBA UG/L 0.13 0.02 0.089 0.3 0.11 0.077 0.13 0.064 PFBS UG/L 0.0074 <0.0020 0.0041 0.008 0.0071 0.0065 0.0046 0.0029 0PFDA UG/L 0.016 <0.0010 <0.0010 0.0025 0.012 <0.0010 0.0067 <0.0010 0PFDOA UG/L <0.0010 <0.0010 UJ <0.0010 <0.0020 UJ <0.0010 <0.0010 <0.0010 UJ <0.0010 <0PFHPA UG/L 0.25 0.034 0.19 0.49 0.2 0.15 0.33 0.088 PFHXA UG/L 0.24 0.047 0.2 0.68 0.19 0.17 0.29 0.089 PFHXS UG/L 0.0036 <0.0020 <0.0020 <0.0039 0.0048 <0.0020 <0.0021 <0.0021 <PFNA UG/L 0.085 <0.0010 0.0083 0.058 0.071 0.0013 0.037 0.02 PFOS UG/L 0.03 <0.0020 0.0077 0.03 0.028 <0.0020 0.014 0.0061 PFOSA UG/L <0.0010 <0.0010 <0.0010 <0.0020 UJ <0.0010 <0.0010 0.0015 <0.0010 <0.0PFPEA UG/L 0.29 0.055 0.19 0.63 0.23 0.18 0.29 0.14 PFUNA UG/L <0.0010 <0.0010 <0.0010 <0.0020 <0.0010 <0.0010 <0.0010 <0.0010 <0Notes:ND = Not detected at stated reporting limit PFBA = Perfluorobutanoic Acid PFHPA = Perfluoroheptanoic Acid PFOS Sample Type 1 = Regular Sample PFBS = Perfluorobutane Sulfonic Acid PFHXA = Perfluorohexanoic Acid PFOS

Sample Type 2 = Duplicate Sample PFDA = Perfluorodecanoic Acid PFHXS = Perfluorohexane Sulfonic Acid PFPE

J = Reported value may not be accurate or precise. PFDOA = Perfluorododecanoic Acid PFNA = Perfluorononanoic Acid PFUNUJ = Not detected. Reporting limit may not be accurate or precise.

Page 1 of 1 
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