DES Waste Management Division

29 Hazen Drive; PO Box 95

Concord, NH 03302-0095

2012 Annual Summary Report

Groundwater Monitoring Program

Town Garage/Radio Beacon Site

Londonderry, New Hampshire

NHDES Site #: 198509001

Project Type: Superfund (CERCLA)

Project Number: 0003569

Prepared For:

Town of Londonderry, New Hampshire

c/o Sherilyn B. Young, Esq.

Rath, Young and Pignatelli, P.A.

PO Box 1500

Concord, NH 03302-1500

Prepared By:

Sanborn, Head & Associates, Inc.

20 Foundry Street

Concord, NH 03301

Phone Number: (603) 229-1900

Contact Name: Timothy M. White, P.G.

Contact Email: twhite@sanbornhead.com

Date of Report: January 16, 2013
Groundwater Monitoring Report Cover Sheet

Site Name: Town Garage/Radio Beacon Site

Town: Londonderry

Permit #: GWP-198509001-L-003

Type of Submittal (Check all that apply) 

Periodic Summary Report (year): 2012

Data Submittal (month and year per Condition #7 of Permit): November 2012

Check each box where the answer to any of the following questions is “YES”

Sampling Results

During the most recent monitoring event, were any new compounds detected at any

sampling point?

Well/Compound: 

Are there any detections of contamination in drinking water that is untreated prior to 

use? 

Well/Compound:

Do compounds detected exceed AGQS?

Was free product detected for the first time in any monitoring point?

Surface Water (visible sheen) 

Groundwater (1/8” or greater thickness) 

Location/Thickness: 

Contaminant Trends

Do sampling results show an increasing concentration trend in any source area 

monitoring well?

Well/Compound: 

Do sampling results indicate an AGQS violation in any of the GMZ boundary wells? 

Well/Compound:

Recommendations

Does the report include any recommendations requiring DES action? (Do not check this 

box if the only recommendation is to continue with existing permit conditions.) 

The November 2012 sampling event is the third consecutive sampling event at 

MW-2R with no exceedances of groundwater cleanup standards. As such, we 

propose to meet with USEPA and NHDES to discuss the proposed approach for the 

site closeout process. 

This form is to be completed for groundwater monitoring data submittals and periodic summary reports

submitted to the New Hampshire Department of Environmental Services Waste Management Division.
2012 Annual Summary Report 

Groundwater Monitoring Program 

Town Garage/Radio Beacon Site 

Londonderry, New Hampshire 

NHDES Site No. 198509001 

Prepared for Town of Londonderry, New Hampshire 

File No. 2049.04 

January 2013
20 Foundry Street 

Concord, NH 03301 

Sherilyn B. Young, Esq.

Rath, Young and Pignatelli, P.A. 

P.O. Box 1500 

Concord, NH 03302-1500 

January 16, 2013 

File No. 2049.04 

Re: 2012 Annual Summary Report – Groundwater Monitoring Program

Town Garage/Radio Beacon Site 

Londonderry, New Hampshire 

NHDES Site No. 198509001 

Dear Sherry: 

On behalf of the Town of Londonderry (Town), Sanborn, Head & Associates, Inc. (Sanborn 

Head) completed a groundwater quality monitoring event at the Town Garage/Radio 

Beacon Site (site) in November 2012. In addition to the permit-required annual monitoring 

activities (collection of a volatile organic compound [VOC] groundwater sample at 

monitoring well MW-2R), similar to 2011 sampling, groundwater samples were collected 

from MW-2R, MW-6D-2, and MW-6D-41,2 and analyzed for VOCs, 1,4-dioxane, and total 

(unfiltered) metals (i.e., antimony, arsenic, barium, beryllium, and chromium). 

Groundwater Management Permit (GMP) No. GWP-198509001-L-003 (effective November 

26, 2007) was issued by the New Hampshire Department of Environmental Services 

(NHDES) to the Town for the site. This report is subject to the limitations in Attachment A. 

GROUNDWATER SAMPLING AND ANALYSIS 

Groundwater samples were collected from monitoring well MW-2R, and multi-level 

monitoring well MW-6D (2 and 4 intervals) on November 19, 2012 (refer to Figure 1 for 

the Monitoring Well Location Plan). Prior to purging/sampling monitoring well MW-2R, the 

groundwater level in the well was measured with an electronic water level meter. The 

groundwater sample from monitoring well MW-2R was collected using a portable 

submersible bladder pump. Low-flow sampling techniques were used, as described in 

Sanborn Head’s December 2009 Quality Assurance Project Plan (QAPP). 

 

1 Monitoring well location MW-6D is a deep bedrock well instrumented with a dedicated multi-level well 

system. This system (installed by USEPA as part of the Remedial Investigation [RI]) was designed and 

manufactured by Solinst Ltd. (Solinst) of Ontario, Canada and includes inert gas driven pumps, sample 

tubes, pressure transducers, and cables. This system is reportedly constructed around a 3-inch inside 

diameter poly vinyl chloride (PVC) pipe that serves as a conduit for the sample tubes and transducer 

cables. Discrete sample intervals are separated by inflatable packers, which contain a water-activated 

material inside a rubber sleeve. Groundwater samples were collected previously from intervals MW-6D-2 

and MW-6D-4 between 1994 and 2005. 

2 Although the MW-6D installation is not designed to be sampled in a traditional low-flow manner, for the 

2011 and 2012 sampling events, methods were used that are consistent with Sanborn Head’s previous 

sampling of these locations (from November 1996 to 2005), and the QAPP (e.g., low flow rate, stabilization 

of parameters, field quality assurance/quality control). 
January 16, 2013 Page 2 

20130116_LTG_2012_Annual_Rpt.docx 2049.04 

Groundwater samples were collected from intervals MW-6D-2 and MW-6D-4 using the 

previously-installed, dedicated Solinst inert gas-driven pumps and sampling tubes. 

Sampling techniques for these intervals were generally similar to those used in previous 

sampling events conducted at the site. 

Water quality parameters including temperature, pH, specific conductance, oxygen 

reduction potential (ORP), and dissolved oxygen (DO) were monitored during purging 

using an YSI Model 556 MPS multi-parameter water quality meter with an in-line flow cell. 

Turbidity was monitored via a sampling port installed prior to the flow cell using a Hach 

2100P turbidity meter. Upon parameter stabilization, the in-line flow cell was disconnected 

and primary and duplicate groundwater samples were collected. A summary of stabilized 

water quality parameter data and related field sampling information for the November 

2012 event is presented on the Groundwater Quality Field Sampling Summary form 

included as Attachment B. Historical water quality parameter data are summarized in 

Table 1. 

As indicated above, in addition to the analysis of VOCs at MW-2R, additional groundwater 

samples were collected and analyzed in November 2012. These additional analyses 

consisted of VOCs, 1,4-dioxane, and total (unfiltered) metals (i.e., antimony, arsenic, 

barium, beryllium, and chromium) from MW-2R, MW-6D-2, and MW-6D-4. The reporting 

limit of 0.25 micrograms per liter (μg/l) was used for 1,4-dioxane during the 2012 

sampling event based on an October 19, 2011 letter from NHDES to investigators 

performing work at sites managed by NHDES’ Waste Management Division. 

Groundwater samples were placed in the following pre-cleaned sample containers 

provided by the analytical laboratory: 

 VOCs: 40-milliliter (ml) glass vials with Teflon® septa, pre-preserved with 

hydrochloric acid (HCl); 

 1,4-dioxane: 40-ml glass vials with Teflon® septa, un-preserved; and 

 Metals: 200-ml plastic bottles, pre-preserved with nitric acid (HNO3). 

Following collection, sample containers were stored in a cooler packed with ice and 

transported to Eastern Analytical, Inc. (EAI) of Concord, New Hampshire, a New Hampshire 

certified laboratory, via laboratory courier for: VOC analysis by USEPA Method 8260B; 1,4-

dioxane by USEPA Method 8260B in Selective Ion Monitoring (SIM) mode; and metals by 

USEPA Method 6020. The samples were handled and transported following standard chainof-custody procedures. A trip blank, prepared beforehand by EAI, was also analyzed for 

VOCs by USEPA Method 8260B and 1,4-dioxane by USEPA Method 8260B SIM. A field 

duplicate sample (designated, “DUP-1”) was collected from MW-6D-2 and submitted to EAI 

for analysis using the same methods as the primary field samples. 

A copy of EAI’s analytical laboratory data report for this monitoring event is included as 

Attachment C. Sanborn Head performed an assessment of data quality and usability as 

described in Sanborn Head’s December 2009 QAPP (refer to Attachment D). 
January 16, 2013 Page 3 

20130116_LTG_2012_Annual_Rpt.docx 2049.04 

SUMMARY OF ANALYTICAL RESULTS 

As indicated above, Sanborn Head performed an assessment of data quality and usability 

(Attachment D). Based on this assessment, the data are of sufficient quality for their 

intended purpose (i.e., comparison to applicable groundwater standards). 

Results from the November 2012 groundwater quality monitoring are summarized below: 

 MW-2R: 1,1-dichloroethane (1,1-DCA), 1,1-dichloroethene (1,1-DCE), and 1,4-dioxane 

were the only VOCs detected in the sample from MW-2R. The concentration of 1,1-DCA 

(7 μg/l) was below its groundwater cleanup level (81 μg/l), as was the concentration of 

1,1-DCE (4 μg/l) with a cleanup level (7 μg/l). The concentration of 1,1-DCA was equal 

to the concentration recorded in 2011; the 1,1-DCE concentration was slightly above 

the 2011 concentration (4 μg/L [2012] vs. 3 μg/l [2011]). The concentration of 1,4-

dioxane (0.35 μg/l) was below its NHDES Ambient Groundwater Quality Standard 

(AGQS) [3 μg/l], and was equal to the 10-6 excess lifetime cancer risk (ELCR) drinking 

water value3

 MW-6D-2: 1,1-DCA, toluene, and 1,4-dioxane were the only VOCs detected in the 

sample collected from MW-6D-2, and the concentration of 1,1-DCA (4 μg/l in both the 

primary and duplicate samples) was well below its groundwater cleanup level (81 

μg/l). The concentration of toluene (2 μg/l in both the primary and duplicate samples) 

was also well below its groundwater cleanup level (1,000 μg/l). The concentration of 

1,4-dioxane in the primary sample (0.35 μg/l) was below its NHDES AGQS (3 μg/l), and 

equal to USEPA’s 10-6 ELCR drinking water value, while the 1,4-dioxane concentration

in the duplicate sample (0.40 μg/l), slightly exceeded USEPA’s 10-6 ELCR value. Arsenic 

was detected at a concentration of 1.1 μg/l in the primary sample (1.5 μg/l in the 

duplicate sample), below its groundwater cleanup level of 10 μg/l. Barium was detected 

at 220 μg/l in the primary sample and duplicate samples, well below its groundwater 

cleanup level (2,000 μg/l). Antimony, beryllium, and chromium were not detected 

above laboratory reporting limits in 2012. Overall, the 2012 VOC and metals 

concentrations at MW-6D-2 are generally consistent with 2011 results. 

. 1,4-dioxane was detected at 0.45 μg/l at MW-2R in 2011. Arsenic was 

detected at 1 μg/l, below its groundwater cleanup level of 10 μg/l. Barium was detected 

at 370 μg/l, below its groundwater cleanup level of 2,000 μg/l. Beryllium and 

chromium were each detected at 2 μg/l, below their groundwater cleanup levels, 4 μg/l 

and 100 μg/l, respectively. Antimony was not detected above the laboratory reporting 

limit in 2012. Overall, the 2012 VOC and metals concentrations at MW-2R are generally 

consistent with 2011 results. 

 MW-6D-4: Similar to MW-6D-2, 1,1-DCA, toluene, and 1,4-dioxane were the only VOCs 

detected in the sample collected from MW-6D-4. The concentration of 1,1-DCA (3 μg/l) 

was well below its groundwater cleanup level (81 μg/l). Toluene was detected at 1 μg/l, 

well below its groundwater cleanup level (1,000 μg/l). 1,4-dioxane was detected at 0.28 

μg/l, below its NHDES AGQS (3 μg/l) and USEPA’s 10-6 ELCR drinking water value (0.35 

 

3 USEPA. 2010. Toxicological Review of 1,4-Dioxane, In Support of Summary Information on the Integrated 

Risk Information System (IRIS). EPA/635/R-09/005-F. Dated August 2010. 
Sanborn, Head 

and Associates, 

Inc.

Digitally signed by Sanborn, Head and 

Associates, Inc. 

DN: cn=Sanborn, Head and Associates, 

Inc., o=Sanborn, Head & Associates, 

Inc., ou=SHA, 

email=lsmith@sanbornhead.com, c=US 

Date: 2013.01.22 16:41:56 -05'00'

january 16, 2013 

20130116_LTG_2012_Annuai_Rptdocx 

Page4 

2049.04 

Jlg/1). Arsenic was detected at a concentration of 0.6 llg/1, below its groundwater 

cleanup level (10 Jlg/1). Barium was detected at 240 Jlg/1, below its groundwater 

cleanup level (2,000 Jlg/1). Chromium was detected at 4 Jlg/1, below its groundwater 

cleanup level (100 Jlg/1). Antimony and beryllium were not detected at this location in 

2012. Overall, the 2012 VOC and metals concentrations at MW-60-4 are generally 

consistent with 2011 results. 

CLOSING 

Results of the November 2012 groundwater monitoring at the Town Garage/Radio Beacon 

Site in Londonderry, New Hampshire indicate generally similar concentrations to those 

recorded in 2011. These concentrations are consistent with historically improving 

groundwater quality conditions in the vicinity of monitoring wells MW-2R, MW-60-2 and 

MW-60-4, with concentrations of all contaminants below their cleanup levels, and at or 

near to their lowest concentrations recorded since monitoring began in 1994. The 

concentrations of 1,4-dioxane were well below the NHDES AGQS, and below to slightly 

above the USEPA's 10·6 ELCR drinking water value of 0.35 Jlg/1. 

The results of 2012 monitoring indicate the site groundwater has met the conditions of the 

GMP (i.e., groundwater concentrations below their respective cleanup levels for two 

consecutive rounds); and hence considering the recent expiration of the site GMP on 

November 25, 2012, we do not propose to renew the GMP. In addition, the Record of 

Decision (ROD) requires no exceedances of groundwater cleanup levels for a period of 

three consecutive years, and with the November 2012 results constituting the third 

consecutive annual sampling event at MW-2R with no exceedances of groundwater cleanup 

standards, we propose to move to site closure. As one of the first steps in this process, we 

recommend meeting with USEPA and NHDES at their earliest convenience to confirm the 

scope ofthe risk assessment. We propose to engage a risk assessor for the meeting with the 

Agencies. Following concurrence from the Agencies regarding the scope of the risk 

assessment, working with our risk assessor we will conduct an analysis of potential risk 

related to site groundwater. The findings of the risk assessment would be provided to the 

Agencies for review. 

We greatly appreciate the opportunity to continue working with you on this project. If you 

have any questions or issues regarding the information provide~~WJ~~e contact us. 

-----~,¢ ~ 

rft imot . ite, P.G. 

~(!:23;:;~ Charles A. Crocetti, Ph.D., P.G. 

Principal 

SAN BORN ~~ ~~ H EAD 
January 16, 2013 Page 5 

20130116_LTG_2012_Annual_Rpt.docx 2049.04 

SRN/CAC: tmw 

Encl. Tables 1 and 2 

Figures 1-4 

Attachment A – Limitations 

Attachment B – Groundwater Quality Field Sampling Summary Form 

Attachment C – Analytical Laboratory Data Report 

Attachment D – Data Quality / Data Usability Assessment 

S:\CONDATA\2000s\2049.04\Source Files\2012 Annual Report\20130116_LTG_2012_Annual_Rpt.docx 
TABLES 

 
TABLE 1

Summary of VOCs and Chloride Analytical Data - Monitoring Wells

Town Garage / Radio Beacon Site

Londonderry, New Hampshire

NHDES Site No. 198509001

Monitoring Well

Location

Chloride

(mg/l)

1,1-DCA

(μg/l)

1,1-DCE

(μg/l)

1,1,1-TCA

(μg/l) 

 Other VOCs

(μg/l)

Cleanup Levels 250 mg/l 81 μg/l 7 μg/l 200 μg/l

6/3/1994 10,900 100 37 300

12/6/1994 12,410 100 48 360

4/20/1995 11,530 120 58 280

10/12/1995 9,000 120 62 320

5/1/1996 11,300 150 86 360 6.9 - Chloroethane

11/27/1996 NS 110 50 240

11/20/1997 NS 100 64 160 1 - Toluene

11/21/97 Dup. NS 110 70 180

11/10/1998 NS 110 58 150 1 - Toluene

7 - Chloroethane

11/23/1999 NS 86 40 85 8 - Chloroethane

11/21/2000 NS 120 48 56 13 - Chloroethane

11/19/2001 NS 100 48 52 17 - Chloroethane

11/15/2002 NS 57 28 28 7 - Chloroethane

11/15/02 Dup. NS 59 30 28 8- Chloroethane

11/4/2003 NS 57 28 19 10 - Chloroethane

11/4/03 Dup. NS 56 27 19 8 - Chloroethane

11/4/2004 NS 46 18 11 7 - Chloroethane

11/4/04 Dup. NS 46 19 11 8 - Chloroethane

11/29/2005 NS 36 18 8 5 - Chloroethane

11/29/05 Dup. NS 37 18 8 6 - Chloroethane

11/13/2006 NS 33 18 7 5 - Chloroethane

12/11/2006 NS 36 21 8 6 - Chloroethane

11/9/2007 NS 21 14 3

11/6/2008 NS 17 9 BDL

5/19/2010 NS 11 7 BDL

05/19/10 Dup. NS 11 7 BDL

11/22/2011 NS 7 3 BDL 0.44 - 1,4-Dioxane

11/19/2012 NS 7 4 BDL 0.35 - 1,4-Dioxane

Date

MW-2D/2R Location (GMP sampling location)

MW-2R

Installed 10/30/06

MW-2D-6

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TABLE 1

Summary of VOCs and Chloride Analytical Data - Monitoring Wells

Town Garage / Radio Beacon Site

Londonderry, New Hampshire

NHDES Site No. 198509001

Monitoring Well

Location

Chloride

(mg/l)

1,1-DCA

(μg/l)

1,1-DCE

(μg/l)

1,1,1-TCA

(μg/l) 

 Other VOCs

(μg/l)

Cleanup Levels 250 mg/l 81 μg/l 7 μg/l 200 μg/l

Date

MW-6D* 11/1/1990 NS 13 6 BDL

6/2/1994 NS 6.6 2.5 BDL

3.80 - THM

7.50 - Toluene

340 - MEK

150 - Acetone

5/9/1996 8,480 16 2.2 BDL

7.8 - Carbon disulfide

40 - MEK

25 - Toluene

6/2/1994 8,800 11 7 BDL 1.50 - Toluene

12/1/1994 9,050 13 7.1 BDL

4/20/1995 8,714 10 6.3 BDL 1.10 - MTBE

1.80 - Toluene

10/10/1995 9,300 12 6.1 BDL 2.3 - MTBE

5/9/1996 7,350 11 6.8 BDL 2.6 - Toluene

11/26/1996 NS 10 5 BDL

11/20/1997 NS 12 8 BDL 1 - Toluene

11/9/1998 NS 10 6 BDL 2 - Toluene

11/22/1999 NS 9 4 BDL 1 - Toluene

11/17/2000 NS 11 4 BDL

11/17/00 Dup. NS 10 3 BDL

11/19/2001 NS 11 5 BDL 1 - Toluene

11/14/2002 NS 13 5 BDL 1 - Toluene

11/5/2003 NS 9 3 BDL 2 - Toluene

11/3/2004 NS 8 2 BDL 1 - Toluene

11/28/2005 NS 6 1 BDL 1 - Toluene

11/22/2011 NS 3 BDL BDL 2 - Toluene

0.34 - 1,4-Dioxane

11/22/11 Dup. NS 3 BDL BDL 2 - Toluene

0.35 - 1,4-Dioxane

11/19/2012 NS 4 BDL BDL 2 - Toluene

0.35 - 1,4-Dioxane

11/19/12 Dup. NS 4 BDL BDL 2 - Toluene

0.40 - 1,4-Dioxane

MW-6D-2

MW-6D Location (monitoring well not sampled as part of GMP)

MW-6D-1

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TABLE 1

Summary of VOCs and Chloride Analytical Data - Monitoring Wells

Town Garage / Radio Beacon Site

Londonderry, New Hampshire

NHDES Site No. 198509001

Monitoring Well

Location

Chloride

(mg/l)

1,1-DCA

(μg/l)

1,1-DCE

(μg/l)

1,1,1-TCA

(μg/l) 

 Other VOCs

(μg/l)

Cleanup Levels 250 mg/l 81 μg/l 7 μg/l 200 μg/l

Date

6/2/1994 2,200 3.2 1.5 BDL

12/1/1994 1,860 3.6 1.7 BDL 1.50 - Toluene

4/20/1995 2,379 3 1.4 BDL 1.50 - Toluene

10/10/1995 7,850 14 6.3 BDL 2.40 - MTBE

5/9/1996 1,570 2.6 BDL BDL

6/2/1994 3,800 5.2 BDL BDL 2.60 - 1,2 DCA

12/1/1994 4,590 8.5 3.4 BDL

4/20/1995 3,621 5 2.1 BDL

10/10/1995 7,410 18 6.6 4.5 1.40 - MTBE

5/9/1996 2,210 3.5 2.1 BDL

11/26/1996 NS 6 3 BDL 1 - Toluene

11/20/1997 NS 18 9 BDL

11/9/1998 NS 16 7 BDL 1 - Toluene

11/22/1999 NS 9 4 BDL

11/17/2000 NS 12 4 BDL

11/19/2001 NS 17 6 BDL

11/14/2002 NS 16 5 BDL 1 - Toluene

11/5/2003 NS 7 2 BDL

11/3/2004 NS 6 2 BDL

11/28/2005 NS 2 BDL BDL 1 - Toluene

11/22/2011 NS BDL BDL BDL 2 - Toluene

11/19/2012 NS 3 BDL BDL 1 - Toluene

0.28 - 1,4-Dioxane

Nov-90 440 BDL BDL BDL 

5/9/1994 257 BDL BDL BDL 2.20 - THM

11/3/1994 NS BDL BDL BDL 4.20 - THM

4/26/1995 192 BDL BDL BDL 2.5 - THM

11/1/1990 NS BDL BDL BDL 

5/9/1994 833 BDL BDL BDL

12/6/1994 797 BDL BDL BDL

4/26/1995 810 BDL BDL BDL

Nov-90 3,410 74 18 790

5/11/1994 1,682 59 15 200

11/3/1994 1,170 150 29 450

4/21/1995 1,211 78 25 200

10/12/1995 2,440 150 31 410 14 - MTBE

5/2/1996 760 30 6.7 79

11/26/1996 NS 23 4 59

11/20/1997 NS 33 8 81

Replacement Well

installed 11/18/99 11/22/1999 NS BDL BDL 4

12/6/2000 NS 4 1 9

11/19/2001 NS 6 2 12 8 - THM

11/19/01 Dup. NS 6 2 12 7 - THM

11/15/2002 NS BDL BDL BDL

11/4/2003 NS BDL BDL BDL 5 - THM

11/3/2004 NS BDL BDL BDL

11/28/2005 NS BDL BDL BDL

MW-2D* Nov-90 3,960 46 41 BDL

MW-1S

MW-1D

MW-2S

Decommissioned Wells

MW-6D Location (cont'd)

MW-6D-3

MW-2S

MW-6D-4

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TABLE 1

Summary of VOCs and Chloride Analytical Data - Monitoring Wells

Town Garage / Radio Beacon Site

Londonderry, New Hampshire

NHDES Site No. 198509001

Monitoring Well

Location

Chloride

(mg/l)

1,1-DCA

(μg/l)

1,1-DCE

(μg/l)

1,1,1-TCA

(μg/l) 

 Other VOCs

(μg/l)

Cleanup Levels 250 mg/l 81 μg/l 7 μg/l 200 μg/l

Date

4/20/1995 5,749 100 9.1 7.3 180 - MTBE

24 - Toluene

10/13/1995 4,090 31 5.2 6.3

110 - MEK

4.8 - THM

6.1 - Toluene

2.2 - Carbon disulfide

5/1/1996 4,100 69 12 5.3

3.5 - Carbon disulfide

3.3 - THM

130 - MEK

10 - Toluene

5.6 - Chloroethane

12/6/1994 5,420 46 4.5 6.9 12 - Toluene

390 - MEK

4/20/1995 5,484 140 13 BDL 72 - Toluene

10/13/1995 4,270 160 17 BDL 75 - Toluene

6.7 - Dimethyl sulfide

5/1/1996 2,800 87 19 BDL

64 - Acetone

8.4 - Carbon disulfide

120 - Toluene

11/27/1996 NS 20 BDL BDL 180 - Toluene

600 - MEK

11/20/1997 NS 12 9 BDL

82 - Toluene

220 - MEK

10 - 2-Hexanone

11/10/1998 NS 9 8 BDL 67 - Toluene

60 - MEK

11/23/1999 NS 5 4 BDL 14 - Toluene

10 - MEK

11/21/2000 NS 6 4 BDL

10 - Acetone

30 - MEK

11 - Toluene

11/19/2001 NS 6 4 BDL

20 - Acetone

20 - MEK

14 - Toluene

11/15/2002 NS 4 3 BDL

20 - Acetone

10 - MEK

13 - Toluene

11/4/2003 NS 4 3 BDL 10 - Acetone

9 - Toluene

11/4/2004 NS 6 3 BDL 20 - Acetone

11 - Toluene

11/28/2005 NS 6 3 BDL 20 - Acetone

13 - Toluene

12/6/1994 2,339 7 6.2 2.6 1.20 - Toluene

4/20/1995 2,458 6.5 5.1 1.7 1.20 - Toluene

10/13/1995 2,410 6.6 5.5 1.7 1.5 - MTBE

5/1/1996 2,400 7.8 9.2 BDL 3.3 - MTBE

6/3/1994 NS BDL BDL 7.6

12/6/1994 7,390 11 8 6.4

4/20/1995 7,979 12 8 5.5

10/12/1995 8,810 14 9.9 5.7 2 - MTBE

5/1/1996 8,700 22 20 9.9 2.8 - MTBE

MW-2D-2

MW-2D-1

MW-2D-3

MW-2D-4

Decommissioned Wells (cont'd)

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TABLE 1

Summary of VOCs and Chloride Analytical Data - Monitoring Wells

Town Garage / Radio Beacon Site

Londonderry, New Hampshire

NHDES Site No. 198509001

Monitoring Well

Location

Chloride

(mg/l)

1,1-DCA

(μg/l)

1,1-DCE

(μg/l)

1,1,1-TCA

(μg/l) 

 Other VOCs

(μg/l)

Cleanup Levels 250 mg/l 81 μg/l 7 μg/l 200 μg/l

Date

6/3/1994 36,000 33 17 34

12/6/1994 18,980 19 15 23

4/20/1995 17,940 34 20 27

10/12/1995 17,400 37 25 20 2.4 - MTBE

5/1/1996 18,800 50 44 30 2.1 - Chloroethane

Nov-90 42 BDL BDL BDL

5/17/1994 39 BDL BDL BDL

11/3/1994 74 6.8 BDL BDL

4/17/1995 29 BDL BDL BDL

10/11/1995 137 BDL BDL BDL

1.1 - Chloroethane

1.7 - THM

2.5 - MTBE

5/13/1996 20 BDL BDL BDL

Nov-90 580 15 BDL BDL

5/17/1994 4,537 11 5.8 BDL

12/1/1994 4,260 11 6.2 BDL

4/17/1995 4,425 9.4 5.1 BDL

10/11/1995 212 11 5.2 BDL

5/13/1996 4,400 12 8.3 BDL

11/26/1996 NS 8 4 BDL

11/20/1997 NS 8 6 BDL

11/9/1998 NS 7 4 BDL

11/22/1999 NS 5 3 BDL

11/22/99 Dup. NS 5 3 BDL

11/17/2000 NS 6 2 BDL

11/19/2001 NS 6 2 BDL

11/14/2002 NS 4 2 BDL

11/5/2003 NS 4 1 BDL

11/3/2004 NS 3 1 BDL

11/28/2005 NS 3 1 BDL

Nov-90 2,880 BDL BDL BDL

5/11/1994 1,124 4.2 BDL BDL 1.40 - Chloroethane

11/3/1994 3,124 6.6 BDL BDL

4/25/1995 2,010 3.6 BDL BDL 4.10 - MTBE

2.20 - Chloroethane

10/17/1995 3,300 4.6 BDL BDL 1.2 - MTBE

4/24/1996 1,210 2.8 BDL BDL 2.7 - Chloroethane

MW-4D* Nov-90 23,500 19 18 25

MW-4D-1 4/26/1996 3,810 7.7 5.9 3.8

2 - Carbon disulfide

6.2 - THM

43 - MEK

2.1 - Methylene 

chloride

2.9 - Toluene

MW-3D

MW-3S

MW-2D-5

Decommissioned Wells (cont'd)

MW-4S

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TABLE 1

Summary of VOCs and Chloride Analytical Data - Monitoring Wells

Town Garage / Radio Beacon Site

Londonderry, New Hampshire

NHDES Site No. 198509001

Monitoring Well

Location

Chloride

(mg/l)

1,1-DCA

(μg/l)

1,1-DCE

(μg/l)

1,1,1-TCA

(μg/l) 

 Other VOCs

(μg/l)

Cleanup Levels 250 mg/l 81 μg/l 7 μg/l 200 μg/l

Date

4/26/1995 24,850 5.1 7.5 4.2 3.50 - THM

9.80 - Toluene

4/26/1996 22,300 8 11 4.5

2.5 - Carbon disulfide

3.2 - THM

3 - Methylene Chloride

4.5 - Toluene

11/25/1996 NS 7 7 3 3 - THM

4 - Toluene

11/20/1997 NS 10 10 2 2 - THM

3 - Toluene

11/10/1998 NS 9 5 BDL 2 - Toluene

11/23/1999 NS 9 5 BDL 4 - Toluene

20 - MEK

11/21/2000 NS 13 6 BDL

20 - Acetone

50 - MEK

4 - Toluene

11/20/2001 NS 13 8 3

20 - Acetone

2 -THM

40 - MEK

4 - Toluene

11/15/2002 NS 6 2 BDL 20 - MEK

3 - Toluene

11/4/2003 NS 9 6 3

20 - Acetone

2 -THM

30 - MEK

4 - Toluene

11/4/2004 NS 9 5 BDL 20 - MEK

4 - Toluene

11/29/2005 NS 9 6 2

10 - Acetone

20 - MEK

4 - Toluene

6/2/1994 22,000 7.6 6.5 41 3.50 - MTBE

12/6/1994 19,720 9.2 6.9 43 2.90 - MTBE

4/26/1995 12,000 9.5 7.5 31

10/17/1995 12,900 8.9 3.6 21 2.2 - MTBE

4/26/1996 13,700 11 5.6 24 2.4 - MTBE

2.7 - Chloroethane

11/25/1996 NS 9 2 15

11/20/1997 NS 10 2 10

11/10/1998 NS 7 1 6

11/23/1999 NS 4 BDL 3

11/21/2000 NS 3 BDL BDL

11/20/2001 NS 3 BDL BDL

11/15/2002 NS BDL BDL BDL

11/4/2003 NS BDL BDL BDL

11/4/2004 NS BDL BDL BDL

11/29/2005 NS BDL BDL BDL

MW-4D-3

MW-4D-2

Decommissioned Wells (cont'd)

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TABLE 1

Summary of VOCs and Chloride Analytical Data - Monitoring Wells

Town Garage / Radio Beacon Site

Londonderry, New Hampshire

NHDES Site No. 198509001

Monitoring Well

Location

Chloride

(mg/l)

1,1-DCA

(μg/l)

1,1-DCE

(μg/l)

1,1,1-TCA

(μg/l) 

 Other VOCs

(μg/l)

Cleanup Levels 250 mg/l 81 μg/l 7 μg/l 200 μg/l

Date

Nov-90 3,550 14 21 190

5/18/1994 3,640 2.2 13 89

11/3/1994 2,040 BDL 14 100

4/25/1995 4,072 BDL 9.4 43

10/17/1995 3,000 2.1 13 64 1.4 - PCE

4/24/1996 5,120 2.2 15 81

11/25/1996 NS BDL 9 55

11/20/1997 NS BDL 12 52

11/10/1998 NS BDL 5 27

11/23/1999 NS BDL 4 21

12/6/2000 NS BDL 5 19 7 - MTBE

11/20/2001 NS BDL 3 11 10 - MTBE

11/15/2002 NS BDL 4 11 5 - MTBE

11/4/2003 NS BDL 3 9

11/4/2004 NS BDL 2 5

11/29/2005 NS BDL 1 4

MW-5D* Nov-90 1,110 9 10 66

MW-5D-1 4/25/1996 NS 5 2.4 4.8

96 - Acetone

2.4 - Carbon disulfide

20 - Toluene

MW-5D-2 4/25/1996 1,290 BDL BDL 7.1

5.2 - Carbon disulfide

5.1 - THM

4.1 - Toluene 

6/3/1994 1,900 3.1 5.4 15

4/25/1996 1,790 BDL 2.6 6.3

6/3/1994 6,900 NS NS NS

12/6/1994 6,110 BDL BDL 4.5

4/25/1995 5,780 BDL BDL BDL

10/11/1995 5,760 1 TRACE 2.2 1.6 - MTBE

4/25/1996 6,030 BDL BDL 3.7 3.5 - MTBE

11/25/1996 NS BDL BDL 2

11/20/1997 NS BDL BDL BDL

11/10/1998 NS BDL BDL BDL

11/23/1999 NS BDL BDL BDL

11/21/2000 NS BDL BDL BDL 10 - MTBE

Nov-90 100 BDL BDL BDL

5/17/1994 191 BDL BDL BDL

5/25/1994 174 NS NS NS

11/3/1994 301 BDL BDL BDL

4/17/1995 118 BDL BDL BDL

Nov-90 46 BDL BDL BDL

5/17/1994 95 BDL BDL BDL

11/3/1994 107 BDL BDL BDL

4/17/1995 70 BDL BDL BDL

11/1/1990 35 BDL BDL BDL

5/17/1994 105 BDL BDL BDL

12/6/1994 103 BDL BDL BDL

4/17/1995 99 BDL BDL BDL

MW-7D

MW-5D-3

MW-5S

MW-7S

MW-6S

MW-5D-4

Decommissioned Wells (cont'd)

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TABLE 1

Summary of VOCs and Chloride Analytical Data - Monitoring Wells

Town Garage / Radio Beacon Site

Londonderry, New Hampshire

NHDES Site No. 198509001

Monitoring Well

Location

Chloride

(mg/l)

1,1-DCA

(μg/l)

1,1-DCE

(μg/l)

1,1,1-TCA

(μg/l) 

 Other VOCs

(μg/l)

Cleanup Levels 250 mg/l 81 μg/l 7 μg/l 200 μg/l

Date

Nov-90 3,460 BDL BDL BDL

5/10/1994 597 BDL BDL BDL

11/3/1994 2,105 2.1 BDL 4.6

4/18/1995 895 BDL BDL BDL

10/16/1995 2,700 BDL BDL 5.8

5/3/1996 865 BDL BDL BDL

Nov-90 9,130 48 28 BDL

5/10/1994 1,004 BDL BDL 2

11/3/1994 2,439 2.7 1.3 2.7

4/18/1995 1,122 BDL BDL 1.2

10/16/1995 8,700 11 6 2.9 1.8 - MTBE

5/3/1996 2,140 2.5 BDL 3

11/27/1996 NS 7 4 BDL

11/20/1997 NS 7 5 BDL

11/9/1998 NS 5 3 BDL

11/9/98 Dup. NS 5 3 BDL

11/22/1999 NS 3 2 BDL

11/17/2000 NS 3 1 BDL

16 - Chloromethane

21 - Vinyl Chloride

20 - Acetone

15 - Carbon Disulfide

46 - Benzene

9 - Toluene

4 - Styrene

11/19/2001 NS 4 1 BDL

11/14/2002 NS 2 1 BDL

11/4/2003 NS 3 1 BDL

11/3/2004 NS 2 BDL BDL

11/28/2005 NS BDL BDL BDL

Nov-90 530 BDL BDL BDL

5/11/1994 499 BDL BDL 1.6

11/3/1994 869 BDL BDL 12

4/18/1995 642 BDL BDL 1.2

10/13/1995 860 BDL BDL 11

5/2/1996 490 BDL BDL BDL

6/2/1996 191 BDL BDL BDL

12/8/1994 347 BDL BDL BDL 1.4 - Toluene

4/26/1995 228 BDL BDL BDL

10/17/1995 200 BDL BDL BDL

5/7/1996 130 BDL BDL BDL

5/18/1994 148 1.5 BDL BDL 1.1 - Chloromethane

12/9/1994 118 2.3 BDL BDL

4/26/1995 162 1.4 BDL BDL

10/17/1995 200 1.8 BDL BDL

5/7/1996 156 BDL BDL BDL

RWGD

MW-8S

MW-9S

RWGS

MW-8D

Decommissioned Wells (cont'd)

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TABLE 1

Summary of VOCs and Chloride Analytical Data - Monitoring Wells

Town Garage / Radio Beacon Site

Londonderry, New Hampshire

NHDES Site No. 198509001

Notes: 

1. "1,1-DCA" indicates 1,1-dichloroethane. 

 "1,1-DCE" indicates 1,1-dichloroethene. 

 "1,1,1-TCA" indicates 1,1,1-trichloroethane. 

 "MEK" indicates methyl-ethyl-ketone. 

 "MTBE" indicates methyl-t-butyl ether. 

 "THM" indicates chloroform. 

 "BDL" indicates below laboratory reporting limit. 

 "NS" indicates not sampled. 

2. Underline indicates that the well was sampled in 2012 (MW-2R, MW-6D-2, and 

MW-6D-4 only.). 

3. Shading indicates exceedance of Site Cleanup Level. 

4. "*" indicates that monitoring wells MW-2D, MW-4D, MW-5D, and MW-6D were 

converted to permanent Solinst multilevel wells in 1992. 

5. Cleanup levels: chloride = 250 mg/l; 1,1-DCA = 81 μg/l; 1,1-DCE = 7 μg/l; 1,1,1-

TCA = 200 μg/l. Note that exceedances are shaded. 

6. Although not shaded in the above table, the November 2000 sample from MW-8D 

contained two analytes that exceeded MCLs: benzene and vinyl chloride, with MCLs 

of 5 μg/l and 2 μg/l respectively. 

S:\CONDATA\2000s\2049.04\Source Files\2012 Annual Report\LTG Tables.xlsx Page ͻ of ͻ Sanborn, Head & Associates, Inc.
TABLE 2

Summary of Analytical Results – Supplemental Groundwater Analyses

Town Garage/Radio Beacon Site

Londonderry, New Hampshire

NHDES Site No. 198509001

Concentrations in μg/l.

MW-2R MW-6D-2 

05/19/10 05/19/10 Dup. 11/22/11 11/19/12 11/22/11 11/22/11 Dup. 11/19/12 11/19/

Dup

Dioxane (1,4-) 3 † <1 <1 0.44 0.35 0.34 0.35 0.35 0.40 

Antimony 6 NA <5 <2 <5 <5 <2 <2 

Arsenic 10 NA <1 <1 <5 1.0 <5 <5 1.1 1.5 

Barium 2,000 NA 400 370 210 200 220 220 

Beryllium 4 NA <1 2 <1 <1 <2 <2 

Chromium 100 NA <5 2 <5 <5 <2 <2 

Analyte GW-1

(AGQS) GW-2

Notes: 1. Samples were collected by Sanborn Head on the dates indicated and analyzed by Eastern Analytical, Inc. of Concord, New Hampshire 

Environmental Protection Agency (USEPA) Method 8260B in selective ion monitoring (SIM) mode, and unfiltered metals by USEPA Method 6020. 

2. Concentrations are presented in micrograms per liter (μg/l) which are equivalent to parts per billion (ppb). 3. A blank indicates the sample was not analyzed for this analyte.  "<" indicates the analyte was not detected above the indicated laboratory reporting limit. 4. "GW-1" and "GW-2" Groundwater Standards are from the New Hampshire Department of Environmental Services (NHDES) Contaminated S

Management Policy (RCMP) (January 1998, with 2000 through 2007 revisions/addenda). GW-1 Groundwater Standards are equivalent to the Standards (AGQSs) promulgated in Env-Or 600 (July 2008). The AGQS/GW-1 Groundwater Standards are intended to be protective of groundwater. The GW-2 Groundwater Standards apply to groundwater as a potential source of indoor air contamination 

5. "†" indicates the RCMP lists as not currently available.  "NA" indicates the RCMP lists as not applicable. 

S:\CONDATA\2000s\2049.04\Source Files\2012 Annual Report\LTG Tables.xlsx Page 1 of 1 
FIGURES 

 
TAX MAP 9

TAX MAP 6

TOWN GARAGE

PROPERTY

MW-2R

MW-6D-2,4

File:S:\CONDATA\2000s\2049.04\Graphics Files\CAD\2012 Summary Report\GW_Monitoring_Locations.dwg Plot Date: 1-7-13 

Legend

MW-2R

MW-6D-2,4

Approximate Groundwater Management Zone (GMZ) BoundaryApproximate Property BoundaryApproximate Tax Map Boundary

Tax Map Lot Number

Replacement shallow bedrock monitoring well location and designation included in

the groundwater monitoring program as described in the June 2006 RevisedAmendment No. 2 to the SOW.As described in the June 2006 Revised Amendment No. 2 to the SOW, the

monitoring well was removed from the groundwater monitoring program and not

decommissioned. Similar to 2011, this monitoring well was included in the

November 2012 sampling event.
Note: ND = 0.1 μg/l.

S:\CONDATA\2000s\2049.04\Source Files\2012 Annual Report\MonWellPlot.xls 

0.1

1

10

100

1000

Jan-94 Jan-95 Jan-96 Jan-97 Jan-98 Jan-99 Jan-00 Jan-01 Jan-02 Jan-03 Jan-04 Jan-05 Jan-06 Jan-07 Jan-08 Jan-09 

Concentration (μg/l)

Sample Dates

Figure 2

Concentration vs. Time Plot

MW-2D-6/MW-2R

Town Garage/Radio Beacon Site

Londonderry, New Hampshire

1,1,1-TCA 1,1-DCA 1,1-DCE 1,1,1-TCA Cleanup Goal (200) 1,1-DCE Cleanup Goal (7) MW-2R Installed 1,4-Dioxane 1,4-Dioxane AGQS (3) 

Monitoring well MW-2D-6 was replaced by monitoring well MW-2R on October 30, 2006 (indicated with a black vertical line on this graph). Data points shown from January 1994 through December 2005 reflect samples collected from monitoring well MW-2D-6. Subsequent data starting in November 2006 reflect samples collected from monitoring well MW-2R.Duplicate samples were collected at this interval in 1997, and 2002 through 2005. For graphing purposes, the higher of the two concentrations for each sampling event is shown. 1,4-dioxane analysis began in 2010 at this location. 1,4-dioxane was not detected above the laboratory reporting limit (1 μg/L) at this location in 2010.

Data points plotting at 0.1 ug/L represent concentrations below laboratory reporting limits.
Note: ND = 0.1 μg/l.

S:\CONDATA\2000s\2049.04\Source Files\2012 Annual Report\MonWellPlot.xls 

0.1

1

10

100

1000

Jan-94 Jan-95 Jan-96 Jan-97 Jan-98 Jan-99 Jan-00 Jan-01 Jan-02 Jan-03 Jan-04 Jan-05 Jan-06 Jan-07 Jan-08 Jan-09 

Concentration (μg/l)

Sample Dates

Figure 3

Concentration vs. Time Plot

MW-6D-2

Town Garage/Radio Beacon Site

Londonderry, New Hampshire

1,1,1-TCA 1,1-DCA 1,1-DCE 1,1,1-TCA Cleanup Goal (200) 1,1-DCE Cleanup Goal (7) 1,4-Dioxane 1,4-Dioxane AGQS (3) 1,4-Dioxane 10-6 Risk (0.35)

Duplicate samples were collected at this interval in 2000, 2011, and 2012. For graphing purposes, the higher of the two concentrations for each sampling event is shown. 1,4-dioxane analysis began in 2011 at this interval.Data points plotting at 0.1 ug/L represent concentrations below laboratory reporting limits

Groundwater samples weat this interval between 2
Note: ND = 0.1 μg/l.

S:\CONDATA\2000s\2049.04\Source Files\2012 Annual Report\MonWellPlot.xls 

0.1

1

10

100

1000

Jan-94 Jan-95 Jan-96 Jan-97 Jan-98 Jan-99 Jan-00 Jan-01 Jan-02 Jan-03 Jan-04 Jan-05 Jan-06 Jan-07 Jan-08 Jan-09 

Concentration (μg/l)

Sample Dates

Figure 4

Concentration vs. Time Plot

MW-6D-4

Town Garage/Radio Beacon Site

Londonderry, New Hampshire

1,1,1-TCA 1,1-DCA 1,1-DCE 1,1,1-TCA Cleanup Goal (200) 1,1-DCE Cleanup Goal (7) 1,4-Dioxane 1,4-Dioxane AGQS (3) 1,4-Dioxane 10-6 Risk (0.35)

1,4-dioxane analysis began in 2011 at this interval. 1,4-dioxane was not detected above the laboratory reporting limit (0.25 μg/L) 

at this interval in 2011.Data points plotting at 0.1 ug/L represent concentrations below laboratory reporting limits

Groundwater samples wat this interval between 
ATTACHMENT A 

LIMITATIONS 

 
ATTACHMENT A

LIMITATIONS

1. The conclusions and recommendations described in this letter report are based in 

part on the data obtained from a limited number of groundwater samples from widely 

spaced explorations. The nature and extent of variations between these explorations 

may not become evident until further investigation, or remediation, is initiated. If 

variations or other latent conditions then appear evident, it will be necessary to reevaluate the conclusions and recommendations of this letter report. 

2. Should additional chemical data, historical information, or hydrogeologic information 

become available in the future, such information should be reviewed by Sanborn Head 

and the interpretations, conclusions and recommendations presented herein should 

be modified accordingly. 

3. In preparing this letter report, Sanborn Head has relied on certain information 

provided by other parties referenced herein, and on information contained in the files 

of state and local agencies available at the time of the study. Although there may have 

been some degree of overlap in the information provided by these various sources, 

we did not attempt to independently verify the accuracy or completeness of all 

information reviewed or received during the course of this study. 

4. Water level measurements have been made in the monitoring well sampling locations 

at times and under conditions stated within the text of the letter report. Note that 

fluctuations in the level of the groundwater may occur due to variations in rainfall and 

other factors not evident at the time measurements were made. 

5. Quantitative laboratory analyses were performed as part of the investigation as noted 

within the letter report. The analyses were performed for specific parameters that 

were selected during the course of this study. It must be noted that additional 

compounds not searched for during the current study may be present in indoor air, 

soil, groundwater, surface water, and/or sediment at the site. Moreover, it should be 

noted that variations in the types and concentrations of contaminants and variations 

in their distributions within groundwater may occur due to the passage of time, 

seasonal water table fluctuations, recharge events, and other factors. 

6. The conclusions and recommendations contained in this letter report are based in 

part on various types of chemical data as well as historical and hydrogeologic 

information developed by previous investigators. While Sanborn Head has reviewed 

that data and information as stated in this letter report, any of Sanborn Head’s 

interpretations, conclusions, and recommendations that have relied on that 

information will be contingent on its validity. 

7. The analyses and recommendations contained in this letter report are based on the 

data obtained from the referenced subsurface explorations/sampling locations. The 

explorations/sampling locations indicate conditions only at the specific locations and 

times, and only to the depths penetrated. They do not necessarily reflect variations 
January 2013 Page 2 

Limitations.docx 2049.03 

that may exist between such locations. The validity of the recommendations is based 

in part on assumptions Sanborn Head has made about conditions at the site. Such 

assumptions may be confirmed only during additional characterization, or 

remediation. If subsurface conditions different from those described become evident, 

the recommendations in this letter report must be re-evaluated. 

8. This letter report has been prepared for the exclusive use of the Town of 

Londonderry, New Hampshire for specific application for environmental conditions 

related to the Town Garage/Radio Beacon Site located in Londonderry, New 

Hampshire in accordance with generally-accepted hydrogeologic and environmental 

practices. No warranty, express or implied, is made. 

S:\CONDATA\2000s\2049.04\Source Files\2012 Annual Report\Att A - Limits\Limitations.docx 
ATTACHMENT B 

GROUNDWATER QUALITY 

FIELD SAMPLING SUMMARY FORM 

 
Groundwater Quality Field Sampling Summary

 Date:

Field Measurements

 Sampling Location MW-2R MW-6D-2 MW-6D-4

 Reference Point TPVC TOC TOC

 Reference Point Elevation (feet) 355.69 – –

 Depth to Water (feet) 4.25 – –

 Water Table Elevation (feet) 351.44 –

 Depth to Bottom (feet bgs) 48.5

99

(from 

TOC)

31

(from 

TOC)

 pH (standard units) 6.8 7.4 7.2

 Specific Conductance (μS/cm) 12,808 8,429 7,097

 Temperature (°C) 9.1 9.8 10.0

 Dissolved Oxygen (mg/L) 1.2 0.1 0.3

 Oxidation Reduction Potential (mV) 145 -77 -69

 Turbidity (NTU) 3.18 0.76 3.8

 Date of Sample 19-Nov 19-Nov 19-Nov

 Sample Time 0924 1053 1148

 Gallons Purged 1⁄2+ 3⁄4 1⁄2

 Purge/Sample Device Bladder

Pump

UHP 

Nitrogen 

Gas

UHP 

Nitrogen 

Gas

 Comment Reference Number 1,2,7 1,3,4,5,7 1,6,7

Comments

 Weather: Clear, 20s-40s °F

 Project Manager: T. White

 Collector(s): M. Stein

 pH, Conductivity, Temperature, DO, ORP Meter: 

 YSI 556 MPS

 Turbidity Meter: Hach 2100P

 Water Level Meter: QED MP30 (MW-2R); 

 Geokon GK404 (MW-6D-2 and MW-6D-4)

 Project Number: 2049.04

 Project Name: Londonderry Town Garage

 Project Location: Londonderry, New Hampshire

November 19, 2012

1. Field screening parameters were generally monitored approximately every five minutes during purging. After the field 

parameters stabilized, groundwater samples were collected. Indicated field parameters were the last stabilized values recorded

prior to sample collection. 

2. Groundwater level measurement was obtained using a QED MP30 electronic water level meter. The well was purged and 

sampled using a 3⁄4-inch diameter bladder pump at flow rates of approximately 40 mL/min. The intake of the bladder pump was 

set at approximately 37.3 ft below ground surface [bgs], which corresponded to the approximate mid-screen depth. 

3. Groundwater level measurement was obtained using previously-installed Geokon, Inc. vibrating wire pressure transducer 

and a Geokon, Inc. GK-401 readout box. The well was purged and sampled using previously-installed, dedicated Solinst inert 

gas (UHP nitrogen)-driven pumps and sampling tubes at flow rates of approximately 120 mL/min. 

4. Field duplicate (labeled "Dup-1") collected. 

5. The groundwater elevation calculated from measurements made using the Geokon are approximately 30 feet lower than 

historical values for MW-6D-2, suggesting that the pressure transducer permanently installed in the well may be 

malfunctioning.

6. The pressure transducer installed in MW-6D-4 was not operational at the time of measurement. The well was purged and 

sampled using previously-installed, dedicated Solinst inert gas (UHP nitrogen)-driven pumps and sampling tubes at flow rates 

of approximately 50 mL/min. 

7. Sampling methods used were consistent with previous sampling events and the site QAPP (e.g., low flow rate, stabilization of 

parameters, field quality assurance/quality control). 

S:\CONDATA\2000s\2049.04\Source Files\

2012 Annual Report\Att B - Field\20121119 GwQFSS.xlsx Page 1 of 1 Sanborn, Head & Associates, Inc.
ATTACHMENT C 

ANALYTICAL LABORATORY 

DATA REPORT 

 
' 

·: 

Eastern Analytical, Inc. 

. services 

Pr0 r, o. dr\\\1(\~ essional laborato ry "" 

Tim White 

Sanborn, Head & Associates, Inc. (NH) 

20 Foundry Street 

Concord , NH 03301 

Subject: Laboratory Report 

Eastern Analytical, Inc. ID: 116211 

Dear Mr. White : 

Client Identification: LTG Londonderry, NH I 2049.04 

Date Received: 11/19/2012 

Enclosed please find the laboratory report for the above identified project. All analyses were performed in 

accordance with our QNQC Program. Unless otherwise stated, holding times, preservation techniques, 

container types, and sample conditions adhered to EPA Protocol. Samples which were collected by Eastern 

Analytical, Inc. (EAI) were collected in accordance with approved EPA procedures. Eastern Analytical, Inc. 

certifies that the enclosed test results meet all requirements of NELAP and other applicable state 

certifications. Please refer to our website at www.eailabs.com for a copy of our NELAP certificate and 

accredited parameters. 

The following standard abbreviations and conventions apply to all EAI reports: 

Solid samples are reported on a dry weight basis, unless otherwise noted 

< : "less than" followed by the reporting limit 

> : "greater than" followed by the reporting limit 

%R : % Recovery 

Eastern Analytical Inc. maintains certification in the following states: Connecticut (PH-0492), Maine (NHOOS), 

Massachusetts (M-NHOOS), New Hampshire/NELAP (1012), Rhode Island (269) and Vermont (VT1012). 

The following information is contained within this report: Sample Conditions summary, Analytical 

Results/Data, Quality Control data (if requested) and copies of the Chain of Custody. This report may not be 

reproduced except in full, without the the written approval of the laboratory. 

If you have any questions regarding the results contained within, please feel free to directly contact me or the 

chemist(s) who performed the testing in question. Unless otherwise requested, we will dispose of the 

sample(s) 30 days from the sample receipt date. 

We appreciate this opportunity to be of service and look forward to your continued patronage. 

Sincerely, 

10 

Lorraine Olashaw, Lab Director #of pages (excluding cover letter) 

25 Che n ell Drive I Concord, NH 0330 I I 800.287.0525 I www.eailabs.com 
' 

SAMPLE CONDITIONS PAGE 

Client: Sanborn, Head & Associates, Inc. (NH) 

Client Designation: LTG Londonderry, NH / 2049.04 

EAIID#: 116211 

Temperature upon receipt (°C): 4 

Acceptable temperature range ("C): 0-6 

Received on ice or cold packs (Yes/No): y 

Date Date Sample% Dry 

Lab ID Sample ID Received Sampled Matrix Weight Exceptions/Comments {other than thermal preservation) 

116211.01 MW-2R /11-19-12 11/19/12 11/19/12 aqueous Adheres to Sample Acceptance Policy 

116211 .02 MW-60-2/11-19-12 11/19/12 11/19/12 aqueous Adheres to Sample Acceptance Policy 

116211 .03 MW-60-4/11-19-12 11/19/12 11/19/12 aqueous Adheres to Sample Acceptance Policy 

116211 .04 DUP-1/11-19-12 11/19/12 11 /19/12 aqueous Adheres to Sample Acceptance Policy 

116211.05 Trip Blank 8260/11-19-12 11/19/12 11/6/12 aqueous Adheres to Sample Acceptance Policy 

116211.06 Trip Blank 1,4 Dioxane /11-19 11/19/12 11/1/12 aqueous Adheres to Sample Acceptance Policy 

-12 

Samples were properly preserved and the pH measured when applicable unless otherwise noted. Analysis of solids for pH, Flashpoint, 

lgnitibility, Paint Filter, Corrosivity, Conductivity and Specific Gravity are reporled on an "as received" basis. 

All results contained in this report relate only to the above fisted samples. 

References include: 

1) EPA 600/4-79-020, 1983 

2) Standard Methods for Examination of Water and Wastewater: lnorganics, 19th Edition, 1995; Microbiology, 20th Edition, 1998 

3) Test Methods for Evaluating Solid Waste SW 846 3rd Edition including updates IVA and IVB 

4) Hach Water Analysis Handbook, 2nd edition, 1992 

Eastern Analytical, Inc. www.eailabs.com 1800.287.0525 1 customerservice@eailabs.com 

1 
LA BORA TORY REPORT 

• 

' EAIID#: 116211 

Client: Sanborn, Head & Associates, Inc. (NH) 

Client Designation: LTG Londonderry, NH /2049.04 

Sample ID: MW-2R /11-19-12 MW-6D-2/11 MW-6D-4/ DUP-1/11 Trip Blank 

-19-12 11-19-12 -1 9-12 8260 I 11-19 

-12 

Lab Sample ID: 116211.01 116211.02 116211.03 116211.04 116211.05 

Matrix: aqueous aqueous aqueous aqueous aqueous 

Date Sampled: 11/19/12 11/19/12 11/19/12 11/19/12 11/6/12 

Date Received: 11/19/12 11/19/12 11/19/12 11/19/12 11/19/12 

Units: ug/1 ug/1 ug/1 ug/1 ug/1 

Date of Analysis: 11/21/12 11/21112 11/21112 11/21/12 11/21/12 

Analyst: BAM BAM BAM BAM BAM 

Method: 8260B 8260B 82608 8260B 82608 

Dilution Factor: 1 

Dichlorodifluoromethane <5 <5 <5 <5 <5 

Chloromethane <2 <2 <2 <2 <2 

Vinyl chloride <2 <2 <2 <2 <2 

8romomethane <2 <2 <2 <2 <2 

Chloroethane <5 <5 <5 <5 <5 

T richlorofl uoromethane <5 <5 <5 <5 <5 

Oiethyl Ether <5 <5 <5 <5 <5 

Acetone <10 < 10 < 10 < 10 < 10 

1,1-0ichloroethene 4 < 1 < 1 < 1 < 1 

tert-Butyl Alcohol (TBA) <30 < 30 < 30 < 30 < 30 

Methylene chloride <5 <5 <5 <5 <5 

Carbon disulfide <5 <5 <5 <5 <5 

Methyl-t-butyl ether(MTBE) <5 <5 <5 <5 <5 

Ethyl-t-butyl ether(ETBE) <5 <5 <5 <5 <5 

Isopropyl ether(OIPE) <5 <5 <5 <5 <5 

tert-amyl methyl ether(T AME) <5 <5 <5 <5 <5 

trans-1 ,2-0ichloroethene <2 <2 <2 <2 <2 

1 ,1-0ichloroethane 7 4 3 4 <2 

2,2-0ichloropropane <2 <2 <2 <2 <2 

cis-1,2-0ichloroethene <2 <2 <2 <2 <2 

2-8utanone(MEK) < 10 < 10 < 10 < 10 <10 

Bromochloromethane <2 <2 <2 <2 < 2 

T etrahydrofuran(TH F) < 10 <10 < 10 < 10 < 10 

Chloroform <2 <2 <2 <2 <2 

1,1 ,1-Trichloroethane <2 <2 <2 <2 <2 

Carbon tetrachloride <2 <2 <2 <2 <2 

1,1-Dichloropropene <2 <2 <2 <2 <2 

Benzene < 1 < 1 < 1 < 1 < 1 

1,2-0ichloroethane <2 <2 <2 <2 <2 

T rich loroethene <2 <2 <2 <2 <2 

1,2-0ichloropropane <2 <2 <2 <2 <2 

Oibromomethane <2 <2 <2 <2 <2 

Bromodichloromethane < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 

1,4-0ioxane <50 <50 <50 <50 <50 

4-Methyl-2-pentanone(MIBK) < 10 < 10 < 10 <10 < 10 

cis-1,3-0ichloropropene <2 <2 <2 <2 <2 

Toluene < 1 2 1 2 < 1 

trans-1 ,3-0ichloropropene <2 <2 <2 <2 <2 

1,1 ,2-Trichloroethane <2 <2 <2 <2 <2 

2-Hexanone <10 <10 < 10 < 10 < 10 

Tetrachloroethene <2 <2 <2 <2 <2 

1 ,3-0ichloropropane <2 <2 <2 <2 <2 

Dibromochloromethane <2 <2 <2 <2 <2 

1 ,2-0ibromoethane(EOB) <2 <2 <2 <2 < 2 

Chlorobenzene <2 <2 <2 <2 <2 

1,1 , 1 ,2-Tetrachloroethane <2 <2 <2 <2 < 2 

Ethylbenzene < 1 < 1 < 1 < 1 < 1 

Eastern An alytical, Inc. www.eailabs.com 1 800.287.0525 1 customerservice@eailabs.com 2 

.-: 
~ LABORATORY REPORT 

.. EAIID#: 116211 

fi Client: Sanborn, Head & Associates, Inc. (NH) 

Client Designation: LTG Londonderry, NH I 2049.04 

Sample ID: MW-2R /11 -19-12 MW-60-2 /11 MW-60-4/ DUP-1/11 Trip Blank 

-19-12 11-19-12 -19-12 8260 I 11 -19 

-12 

lab Sample ID: 116211.01 116211.02 116211.03 116211.04 116211.05 

Matrix: aqueous aqueous aqueous aqueous aqueous 

Date Sampled: 11/19/12 11/19/12 11/19/12 11/19/12 11/6/12 

Date Received: 11/19/12 11/19/12 11/19/12 11/19/12 11/19/12 

Units: ug/1 ug/1 ug/1 ug/1 ug/1 

Date of Analysis: 11/21/12 11/21/12 11/21/12 11121/12 11/21/12 

Analyst: BAM BAM BAM BAM BAM 

Method: 8260B 8260B 8260B 8260B 8260B 

Dilution Factor: 

mp-Xylene < 1 < 1 < 1 < 1 < 1 

o-Xylene < 1 < 1 < 1 < 1 < 1 

Styrene < 1 < 1 < 1 < 1 < 1 

Bromoform <2 <2 <2 <2 <2 

IsoPropyl benzene < 1 < 1 < 1 <1 < 1 

Bromobenzene <2 <2 <2 <2 <2 

1,1 ,2,2-Tetrachloroethane <2 <2 <2 <2 <2 

1 ,2,3-Trichloropropane <2 <2 <2 <2 <2 

n-Propylbenzene < 1 < 1 < 1 < 1 <1 

2-Chlorotoluene <2 <2 <2 <2 <2 

4-Chlorotoluene <2 <2 <2 <2 <2 

1 ,3,5-Trimethylbenzene < 1 < 1 < 1 < 1 < 1 

tert-Butylbenzene < 1 < 1 < 1 < 1 < 1 

1 ,2,4-Trimethylbenzene < 1 < 1 < 1 < 1 < 1 

sec-Butyl benzene < 1 < 1 < 1 <1 < 1 

1 ,3-Dichlorobenzene <1 < 1 < 1 <1 < 1 

p-lsopropyltoluene < 1 < 1 <1 < 1 < 1 

1 ,4-0ichlorobenzene < 1 < 1 <1 < 1 < 1 

1 ,2-0ichlorobenzene < 1 < 1 <1 < 1 < 1 

n-Butylbenzene <1 < 1 < 1 < 1 <1 

1 ,2-0ibromo-3-chloropropane <2 <2 <2 <2 <2 

1 ,3,5-Trichlorobenzene < 1 < 1 < 1 < 1 < 1 

1 ,2,4-Trichlorobenzene < 1 < 1 < 1 < 1 < 1 

Hexachlorobutadiene < 0.5 < 0.5 < 0.5 < 0.5 < 0.5 

Naphthalene <5 <5 <5 <5 <5 

1 ,2,3-Trichlorobenzene < 1 < 1 < 1 < 1 < 1 

4-Bromofluorobenzene (surr) 100 %R 101 %R 101 %R 100 %R 100 %R 

1 ,2-Dichlorobenzene-d4 (surr) 113 %R 115 %R 116 %R 113 %R 115 %R 

Toluene-dB (surr) 94%R 95%R 94%R 94%R 95%R 

Eastern Analytical, Inc. www.eailabs.com 1800.287.0525 I customerservice@eailabs.com 3 
QC REPORT 

EAI ID#: 116211 

Client: Sanborn, Head & Associates, Inc. (NH) 

Client Designation: LTG Londonderry, NH / 2049.04 

Parameter Name Blank LCS LCSD Analysis Date Units Limits RPD Method 

Dichlorodifluoromethane < 5 

Chloromethane < 2 

Vinyl chloride < 2 

Bromomethane < 2 

Chloroethane < 5 

Trichlorofluoromethane < 5 

Oiethyl Ether < 5 

Acetone < 10 

1,1-Dichloroethene < 1 

tert-Butyl Alcohol (TBA) < 30 

Methylene chloride < 5 

Carbon disulfide < 5 

Methyl-t-butyl ether(MTBE) < 5 

Ethyl-t-butyl ether(ET8E) < 5 

Isopropyl ether(DIPE) < 5 

tert-amyl methyl ether(TAME) < 5 

trans-1 ,2-Dichloroethene < 2 

1,1-Dichloroethane < 2 

2,2-Dichloropropane < 2 

cis-1 ,2-Dichloroethene < 2 

2-Butanone(MEK) < 10 

Bromochloromethane < 2 

Tetrahydrofuran(THF) < 10 

Chloroform < 2 

1,1 ,1-Trichloroethane < 2 

Carbon tetrachloride < 2 

1,1-Dichloropropene < 2 

Benzene < 1 

1,2-Dichloroethane < 2 

Trichloroethene < 2 

1,2-Dichloropropane < 2 

Dibromomethane < 2 

Bromodichloromethane < 0.5 

1 ,4-Dioxane < 50 

4-Methyl-2-pentanone(MI8K) < 10 

cis-1 ,3-Dichloropropene < 2 

Toluene < 1 

trans-1 ,3-Dichloropropene < 2 

1,1 ,2-Trichloroethane < 2 

2-Hexanone < 10 

Tetrachloroethene < 2 

1 ,3-Dichloropropane < 2 

Dibromochloromethane < 2 

1 ,2-Dibromoethane(ED8) < 2 

Chlorobenzene < 2 

1,1 , 1,2-Tetrachloroethane < 2 

Eastern Analytical, Inc. 

29 (143 %R) 27 (135 %R) (6 RPD) 11/20/2012 ug/1 40- 160 20 

22(110%R) 20(102%R)(8RPD) 11/20/2012 ug/1 40-160 20 

26(130%R) 25(126%R)(3RPD) 11/20/2012 ug/1 70 - 130 20 

14 (71 %R) 16 (80 %R) (12 RPD) 11/20/2012 ug/1 40- 160 20 

25 (126 %R) 24 (121 %R) (4 RPD) 11/20/2012 ug/1 70-130 20 

* 28 (142 %R) * 27 (135 %R) (5 RPD) 11/20/2012 ug/1 70 - 130 20 

23 (115 %R) 23 (114 %R) (1 RPD) 11/20/2012 ug/1 70 - 130 20 

20 (118 %R) 20 (117 %R) (1 RPD) 11/20/2012 ug/1 40 - 160 20 

22 (1 09 %R) 21 (1 06 %R) (3 RPD) 11/20/2012 ug/1 70 - 130 20 

90(94%R) 100(101%R)(7RPD) 11/20/2012 ug/1 70 - 130 20 

23(114%R) 22(110%R)(4RPD) 11/20/2012 ug/1 70-130 20 

23 (113 %R) 22 (1 08 %R) (5 RPD) 11/20/2012 ug/1 70 - 130 20 

22 (1 08 %R) 22 (1 08 %R) (0 RPD) 11/20/2012 ug/1 70 - 130 20 

21 (106%R) 21 (106%R)(ORPD) 11/20/2012 ug/1 70 - 130 20 

21 (1 03 %R) 20 (1 02 %R) (1 RPD) 11/20/2012 ug/1 70 - 130 20 

21 (103 %R) 20 (102 %R) (1 RPD) 11/20/2012 ug/1 70- 130 20 

21 (107%R) 21 (104%R)(3RPD) 11/20/2012 ug/1 70-130 20 

22(112%R) 21 (107%R)(5RPD) 11/20/2012 ug/1 70 - 130 20 

16(80%R) 15(77%R)(4RPD) 11/20/2012 ug/1 70-130 20 

24 (122 %R) 23 (115 %R) (6 RPD) 11/20/2012 ug/1 70- 130 20 

20 (96 %R) 20 (93 %R) (3 RPD) 11/20/2012 ug/1 40 - 160 20 

21(107%R) 20(101%R)(6RPD) 11/20/2012 ug/1 70-130 20 

20 (85 %R) 20 (85 %R) (0 RPD) 11/20/2012 ug/1 70- 130 20 

24(119%R) 22(112%R)(6RPD) 11/20/2012 ug/1 70 - 130 20 

24(121%R) 23(116%R)(4RPD) 11/20/2012 ug/1 70-130 20 

26 (128 %R) 24 (122 %R) (5 RPD) 11/20/2012 ug/1 70 - 130 20 

22(109%R) 21(104%R)(5RPD) 11/20/2012 ug/1 70 - 130 20 

23(113%R) 21 (107%R)(5RPD) 11/20/2012 ug/1 70-130 20 

24 (118 %R) 22 (112 %R) (5 RPD) 11/20/2012 ug/1 70- 130 20 

21 (104%R) 20(100%R)(4RPD) 11/20/2012 ug/1 70 - 130 20 

21 (107%R) 21 (104%R)(3RPD) 11/20/2012 ug/1 70 - 130 20 

22 (111 %R) 21 (107 %R) (4 RPO) 11/20/2012 ug/1 70-130 20 

23 (117 %R) 22 (1 11 %R) (5 RPD) 11/20/2012 ug/1 70 - 130 20 

<50 (96 %R) <50 (95 %R) (1 RPD) 11/20/2012 ug/1 40- 160 20 

20 (96 %R) 20 (98 %R) (2 RPD) 11/20/2012 ug/1 40 - 160 20 

23 (116 %R) 22 (1 12 %R) (4 RPD) 11/20/2012 ug/1 70- 130 20 

20 (98 %R) 19 (95 %R) (3 RPD) 11/20/2012 ug/1 70 - 130 20 

20 (99 %R) 19 (97 %R) (2 RPO) 11/20/2012 ug/1 70 - 130 20 

20 (98 %R) 19 (95 %R) {3 RPD) 11/20/2012 ug/1 70- 130 20 

20 (95 %R) 20 (95 %R) (0 RPD) 11/20/2012 ug/1 40 - 160 20 

21 (107%R) 21 (104%R)(3RPD) 11/20/2012 ug/1 70-130 20 

19 (95 %R) 18 (92 %R) (3 RPD) 11/20/2012 ug/1 70 - 130 20 

20 (1 00 %R) 20 (99 %R) (1 RPD) 11/20/2012 ug/1 70 - 130 20 

18 (92 %R) 18 (91 %R) (1 RPD) 11/20/2012 ug/1 70-130 20 

20 (98 %R) 19 (93 %R) (5 RPD) 11/20/2012 ug/1 70 - 130 20 

22 (108 %R) 21 (104 %R) (4 RPO) 11/20/2012 ug/1 70-130 20 

www.eailabs.com 1 800.287.0525 1 customerservice@eailabs.com 

82608 

82608 

82608 

82608 

82608 

82608 

82608 

82608 

82608 

82608 

82608 

82608 

82608 

82608 

82608 

82608 

82608 

82608 

82608 

82608 

82608 

82608 

82608 

82608 

82608 

82608 

82608 

82608 

82608 

82608 

82608 

82608 

82608 

82608 

82608 

82608 

82608 

82608 

82608 

82608 

82608 

82608 

82608 

82608 

82608 

82608 

4 
I 

. _ 

QC REPORT 

Client: Sanborn, Head & Associates, Inc. (NH) 

Client Designation: LTG Londonderry, NH / 2049.04 

Parameter Name Blank LCS LCSD Analysis Date Units 

Ethylbenzene <1 21 (104%R) 20 (100 %R) (4 RPD) 

mp-Xylene < 1 41 (103 %R) 39 (98 %R) (5 RPD) 

o-Xylene < 1 20 (101 %R) 19 (97 %R) (4 RPD) 

Styrene < 1 21 (104 %R) 20 (98 %R) (6 RPD) 

Bromoform <2 18 (90 %R) 17 (87 %R) (3 RPD) 

lsoPropylbenzene < 1 22 (112 %R) 22 (108 %R) (4 RPD) 

Bromobenzene <2 18(90%R) 18 (88 %R) (2 RPD) 

1,1 ,2,2-Tetrachloroethane <2 17 (87 %R) 17 (87 %R) (0 RPD) 

1 ,2,3-Trichloropropane <2 18(88%R) 17 (87 %R) (1 RPD) 

n-Propylbenzene < 1 19 (96 %R) 19 (93 %R) (3 RPD) 

2-Chlorotoluene <2 18 (91 %R) 19 (93 %R) (2 RPD) 

4-Chlorotoluene <2 19 (94 %R) 18 (89 %R) (5 RPD) 

1 ,3,5-Trimethylbenzene < 1 19 (97 %R) 19 (93 %R) (4 RPD) 

tert-8utylbenzene < 1 19 (95 %R) 19 (93 %R) (2 RPD) 

1 ,2,4-Trimethylbenzene < 1 19 (96 %R) 18 (92 %R) (4 RPD) 

sec-8utylbenzene < 1 19 (95 %R) 19 (93 %R) (2 RPD) 

1 ,3-Dichlorobenzene < 1 18(92%R) 18 (90 %R) (2 RPD) 

p-lsopropyltoluene <1 19 (97 %R) 19 (97 %R) (0 RPO) 

1 A-Dichlorobenzene < 1 18 (92 %R) 18 (90 %R) (2 RPD) 

1 ,2-Dichlorobenzene <1 18 (91 %R) 18 (90 %R) (1 RPD) 

n-8utylbenzene < 1 19 (94 %R) 18 (92 %R) (2 RPD) 

1 ,2-Dibromo-3-chloropropane <2 15 (76 %R) 15 (76 %R) (0 RPD) 

1 ,3,5-Trichlorobenzene < 1 18 (92 %R) 18 (92 %R) (0 RPD) 

1 ,2,4-Trichlorobenzene < 1 16 (80 %R) 16 (81 %R) (1 RPD) 

Hexachlorobutadiene < 0.5 16 (81 %R) 16 (80 %R) (1 RPD) 

Naphthalene <5 15 (73 %R) 15 (76 %R) (4 RPD) 

1 ,2,3-Trichlorobenzene < 1 17 (84 %R) 17 (87 %R) (4 RPD) 

4-8romofluorobenzene (surr) 100%R 112 %R 110 %R 

1 ,2-Dichlorobenzene-d4 (surr) 11 1 %R 103%R 103%R 

Toluene-dB (surr) 95 %R 97%R 97%R 

Samples were extracted and analyzed within holding time limits. 

Instrumentation was calibrated in accordance with the method requirements. 

The method blanks were free of contamination at the reporting limits. 

Sample surrogate recoveries met the above stated criteria. 

11/20/2012 

11/20/2012 

11/20/2012 

11/20/2012 

11/20/2012 

11/20/2012 

11/20/2012 

11/20/2012 

11/20/2012 

11/20/2012 

11/20/2012 

11/20/2012 

11/20/2012 

11/20/2012 

11/20/2012 

11/20/2012 

11/20/2012 

11/20/2012 

11/20/2012 

11/20/2012 

11/20/2012 

11/20/2012 

11/20/2012 

11/20/2012 

11/20/2012 

11/20/2012 

11/20/2012 

11/20/2012 

11/20/2012 

11/20/2012 

The associated matrix spikes and/or Laboratory Control Samples met acceptance criteria. 

There were no exceptions in the analyses, unless noted. 

ug/1 

ug/1 

ug/1 

ug/1 

ug/1 

ug/1 

ug/1 

ug/1 

ug/1 

ug/1 

ug/1 

ug/1 

ug/1 

ug/1 

ug/1 

ug/1 

ug/1 

ug/1 

ug/1 

ug/1 

ug/1 

ug/1 

ug/1 

ug/1 

ug/1 

ug/1 

ug/1 

% Rec 

%Rec 

% Rec 

*/! Flagged analyte recoveries deviated from the QAJQC limits. Any impact to data is addressed below . 

EAIID#: 116211 

Limits RPD Method 

70-130 20 82608 

70 - 130 20 82608 

70 - 130 20 82608 

70 - 130 20 82608 

70- 130 20 82608 

70-130 20 82608 

70- 130 20 82608 

70- 130 20 82608 

70- 130 20 82608 

70 - 130 20 82608 

70 - 130 20 82608 

70 - 130 20 82608 

70 - 130 20 82608 

70 - 130 20 82608 

70-130 20 82608 

70-130 20 82608 

70- 130 20 82608 

70 - 130 20 82608 

70 - 130 20 82608 

70-130 20 82608 

70- 130 20 82608 

70- 130 20 82608 

70- 130 20 82608 

70- 130 20 82608 

70 - 130 20 82608 

70- 130 20 82608 

70 - 130 20 82608 

70 - 130 20 82608 

70- 130 20 82608 

70-130 20 82608 

Eastern Analytical, Inc. www.eailabs.com 1800.287.0525 1 customerservice@eailabs.com 5 
LABORATORY REPORT 

• EAIID#: 116211 

Client: Sanborn, Head & Associates, Inc. (NH) 

Client Designation: LTG Londonderry, NH /2049.04 

Sample ID: MW-2R /11-19-12 MW-60-2/11 MW-60-4/ OUP-1/11 Trip Blank 

-19-12 11-19-12 -19-12 1,4 Dioxane I 

11-19-12 

Lab Sample ID: 116211.01 116211.02 116211.03 116211.04 116211.06 

Matrix: aqueous aqueous aqueous aqueous aqueous 

Date Sampled: 11/19/12 11/19/12 11/19/12 11/19/12 11/1/12 

Date Received: 11/19/12 11/19/12 11/19/12 11/19/12 11/19/12 

Units: ug/1 ug/1 ug/1 ug/1 ug/1 

Date of Analysis: 11/24/12 11/24/12 11/24/12 11/24/12 11/24/12 

Analyst: VG VG VG VG VG 

Method: 82608 SIM 82608 SIM 82608 SIM 82608 SIM 82608 SIM 

Dilution Factor: 1 

1,4-Dioxane 0.35 0.35 0.28 0.40 < 0.25 

4-Bromofluorobenzene (surr) 100 %R 99%R 100 %R 99%R 99%R 

Toluene-dB (surr) 101 %R 91 %R 102 %R 91 %R 91 %R 

Eastern Analytical, Inc. www.eailabs.com 1800.287.0525 1 customerservice@eailabs.com 6 
• 

QC REPORT 

EAIID#: 116211 

Client Sanborn, Head & Associates, Inc. (NH) 

Client Designation: LTG Londonderry, NH / 2049.04 

Parameter Name Blank LCS LCSD Analysis Date Units Limits RPD Method 

1,4-Dioxane < 0.25 4.3 (85 %R) 4.7 (94 o/oR) (10 RPD) 11/24/2012 ug/1 70 - 130 20 82608 

4-Bromofluorobenzene (surr) 99%R 99%R 98 %R 11/24/2012 % Rec 70- 130 50 82608 

Toluene-d8 (surr) 91 %R 90%R 101%R 11/24/2012 %Rec 70-130 50 82608 

Samples were extracted and analyzed within holding time limits. 

Instrumentation was calibrated in accordance with the method requirements. 

The method blanks were free of contamination at the reporting limits. 

Sample surrogate recoveries met the above stated criteria. 

The associated matrix spikes and/or Laboratory Control Samples met acceptance criteria. 

There were no exceptions in the analyses, unless noted. 

*!! Flagged analyte recoveries deviated from the QNQC limits. Any impact to data is addressed below . 

Eastern Analytical, Inc. www.eailabs.com 1800.287.0525 1 customerservice@eailabs.com 7 
LABORATORY REPORT 

Eastern Analytical, Inc. www.eailabs.com 1 800.287.0525 1 customerservice@eailabs.com 8 
• 

QC REPORT 

Client: Sanborn, Head & Associates, Inc. (NH) 

Client Designation: LTG Londonderry, NH /2049.04 

Date of 

Parameter Name Blank LCS LCSD Units Analysis 

Antimony < 0.001 0.92 (92 %R) mg/L 11/26/12 

Arsenic < 0.001 0.96 (96 %R) mg/L 11/26/12 

Barium < 0.001 0.91 (91 %R) mg/L 11/26/12 

Beryllium < 0.001 1.0(103%R) mg/L 11/26/12 

Chromium < 0.001 0.89 (89 %R) mg/L 11/26/12 

MS/MSD MS/MSD Date of 

Parameter Name Parent ID Parent Matrix Spike MSD Units Analysis 

Antimony 116260.01 < 0.001 1.0 (100 %R) 1.0 (1 00 %R) (0 RPD) mg/L 11/26/12 

Arsenic 116260.01 < 0.001 1.0 (101 %R) 1.0 (1 01 %R) (0 RPD) mg/L 11/26/12 

Barium 116260.01 0.007 0.98 (98 %R) 0.98 (97 %R) (1 RPD) mg/L 11/26/12 

Beryllium 116260.01 < 0.001 1.1 (11 0 %R) 1.1 (109 %R) (1 RPD) mg/L 11/26/12 

Chromium 116260.01 < 0.001 0.93 (93 %R) 0.94 (94 %R) (1 RPD) mg/L 11/26/12 

Samples were analyzed within holding times unless noted on the sample results page. 

Instrumentation was calibrated in accordance with the method requirements. 

The method blanks were free of contamination at the reporting limits. 

The associated matrix spikes and/or Laboratory Control Samples met the above stated criteria. 

Exceptions to the above statements are flagged or noted above or on the QC Narrative page. 

*/! Flagged analyte recoveries deviated from the QAIQC limits. 

EAIID#: 116211 

Limits RPD Method 

80- 120 20 6020 

80- 120 20 6020 

80- 120 20 6020 

80- 120 20 6020 

80- 120 20 6020 

Limits RPD Method 

75-125 20 6020 

75-125 20 6020 

75-1 25 20 6020 

75-125 20 6020 

75-125 20 6020 

Eastern Analytical, Inc. www.eailabs.com 1800.287.0525 I customerservice@eailabs.com 9 
CHAIN-OF-CUSTODY RECORD 

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METALS: 8 RCRA 13 PP FE, MN PB, Cu 

OTHER METALs: S"b, A.s , JS..._, ge. C- r ' . ' 

SAMPLES fiELD fiLTERED? 0 YES 0 No 

NOTES: (IE: SPECIAL DETECTION LIMITS, BILLING INFO, IF DIFFERENT) 

SITE HISTORY: __________ _ 

SUSPEOED (ONTAHINATION: _______ _ 

fiELD READINGS:-----------

,.-

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l>ror, .... : .. . {WHITE: ORIGINAL GREEN: PRO JECT MANAGER) 

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ATTACHMENT D 

DATA QUALITY/DATA USABILITY 

ASSESSMENT 
ATTACHMENT D

DATA QUALITY/DATA USABILITY ASSESSMENT

Sanborn Head performed an assessment of data quality and usability as described in 

Sanborn Head’s December 2009 Quality Assurance Project Plan1 (QAPP; Refer to Tables 

D-1 and D-2). 

 A review of field equipment calibration/calibration check data sheets indicated that the 

field instruments used for the November 2012 groundwater monitoring event were 

calibrated correctly and maintained calibration throughout the day within the criteria 

established in the QAPP with the following exception: 

 The QAPP recommends the specific conductivity probe be calibrated with a 

conductivity solution, and the calibration check completed with a second standard 

to check the linearity of the instrument. We note the specific conductance probe was 

calibrated with a single standard (1,413 μS/cm), and that the standard was 

generally lower than the specific conductance values typically measured in the 

monitoring points at the site (approximately 3,000 – 13,000 μS/cm). Specific 

conductance is one of the groundwater parameters used to assess stabilization (e.g., 

based on relative measurements), which was achieved at each location prior to 

sample collection. Therefore, the specific conductance calibration procedure used in 

2012 is not anticipated to affect the laboratory data quality or usability (e.g., 

comparison to groundwater standards/criteria). 

 A review of the analytical data packages provided by the laboratory indicated the 

following: 

 Laboratory data packages were complete. 

 Laboratory Quality Control (QC) met the applicable criteria with the following 

exceptions: 

 The laboratory control sample (LCS) for trichlorofluoromethane had a slightly 

high recovery (142%; acceptable range: 70-130%) in the 8260B analysis. This 

indicates a potential high bias in the reporting limit for trichlorofluoromethane; 

however, the reporting limit (5 micrograms per liter [μg/l]) was never exceeded 

and is much lower than the applicable groundwater standard (2,000 μg/l). 

Additionally, trichlorofluoromethane is not a compound of concern at this site. 

 There were no analytes detected in the trip blanks. 

 

1 Sanborn Head, December 2, 2009, Quality Assurance Project Plan and Work Plan for Groundwater and 

Surface Water Monitoring, Town Garage/Radio Beacon Site, Londonderry, New Hampshire, NHDES Site 

No. 198509001. The QAPP was initially submitted to USEPA in August 2009. The QAPP was subsequently 

revised in December 2009 based on comments by USEPA, and was approved on April 5, 2010. 
January 2013 Page 2 

DQA-DUE.docx 2049.04 

 The blind field duplicate groundwater sample pair (MW-6D-2/11-19-12 and Dup1/11-19-12) RPDs met acceptance criteria. The arsenic RPD between 

concentrations measured in the primary and duplicate samples was 31% (1.1 μg/l 

in the primary sample vs. 1.5 μg/l in the duplicate sample); however, in accordance 

with the QAPP, these results are accepted because they were less than four times 

the reporting limit (1 μg/l). 

 As noted in the QAPP, reporting limits for cis- and trans-1,3-dichloropropene (reporting 

limit = 2 μg/l vs. AQGS = 0.5 μg/l), 1,2-dibromochloropropane ([DBCP]; reporting limit 

= 2 μg/l vs. AQGS = 0.2 μg/l), and 1,2-dibromoethane ([ethylene dibromide]; reporting 

limit = 2 μg/l vs. AQGS = 0.05 μg/l) did not meet the AGQS/GW-1 Groundwater 

Standard; however, none of these analytes are compounds of concern at this site. 

Based on the data quality/data usability assessment, the data are of sufficient quality for 

their intended purpose (i.e., comparison of concentrations reported for the site-specific 

analytes of concern to applicable groundwater standards). 

S:\CONDATA\2000s\2049.04\Source Files\2012 Annual Report\Att D - DQA\DQA-DUE.docx 
TABLE D-1

Review of Analytical Reporting Limits, Trip Blank, and Duplicate % RPD – Groundwater

Town Garage/Radio Beacon Site – Londonderry, New Hampshire

NHDES Site No. 198509001

Concentrations in μg/l.

Trip Blank / 11-19-12 MW-2R / 11-19-12 MW-6D-4 / 11-19-12 MW-6D-2 / 11-19-12 Dup-1 / 11-19-12

11/6/2012 - VOCs

11/1/12 - 

1,4-dioxane 

by SIM

11/19/12 11/19/12 11/19/12 11/19/12

VOCs

AVOCs

Benzene 71-43-2 5 2,000 <1 <1 <1 <1 <1 –

Butylbenzene (n-) 104-51-8 260 † <1 <1 <1 <1 <1 –

Butylbenzene (sec-) 135-98-8 260 † <1 <1 <1 <1 <1 –

Butylbenzene (tert-) 98-06-6 260 † <1 <1 <1 <1 <1 –

Ethylbenzene 100-41-4 700 3,000 <1 <1 <1 <1 <1 –

Isopropylbenzene (Cumene) 98-82-8 800 NA <1 <1 <1 <1 <1 –

Isopropyltoluene (p-) 99-87-6 260 † <1 <1 <1 <1 <1 –

Naphthalene 91-20-3 20 2,000 <5 <5 <5 <5 <5 –

Propylbenzene (n-) 103-65-1 260 † <1 <1 <1 <1 <1 –

Styrene 100-42-5 100 50,000 <1 <1 <1 <1 <1 –

Toluene 108-88-3 1,000 50,000 <1 <1 1 2 2 0%

Trimethylbenzene (1,2,4-) 95-63-6 330 3,000 <1 <1 <1 <1 <1 –

Trimethylbenzene (1,3,5-) 108-67-8 330 NS <1 <1 <1 <1 <1 –

Xylene (m,p-) 108-38-3 106-42-3 NS NS <1 <1 <1 <1 <1 –

Xylene (o-) 95-47-6 NS NS <1 <1 <1 <1 <1 –

Total Xylenes 1330-20-7 10,000 30,000 ND ND ND ND ND –

CVOCs

Carbon Tetrachloride 56-23-5 5 40 <2 <2 <2 <2 <2 –

Chlorobenzene (Monochlorobenzene) 108-90-7 100 2,000 <2 <2 <2 <2 <2 –

Chloroethane 75-00-3 NS NS <5 <5 <5 <5 <5 –

Chloroform (Trichloromethane) ¢ 67-66-3 70 100 <2 <2 <2 <2 <2 –

Chloromethane 74-87-3 30 † <2 <2 <2 <2 <2 –

Chlorotoluene (2-) 95-49-8 100 † <2 <2 <2 <2 <2 –

Chlorotoluene (4-) 106-43-4 NS NS <2 <2 <2 <2 <2 –

Dichlorobenzene (1,2-) 95-50-1 600 20,000 <1 <1 <1 <1 <1 –

Dichlorobenzene (1,3-) 541-73-1 600 † <1 <1 <1 <1 <1 –

Dichlorobenzene (1,4-) 106-46-7 75 50,000 <1 <1 <1 <1 <1 –

Dichloroethane (1,1-) 75-34-3 81 10,000 <2 7 3 4 4 0%

Dichloroethane (1,2-) 107-06-2 5 300 <2 <2 <2 <2 <2 –

Dichloroethene (1,1-) 75-35-4 7 1,000 <1 4 <1 <1 <1 –

Dichloroethene (cis-1,2-) 156-59-2 70 NA <2 <2 <2 <2 <2 –

Dichloroethene (trans-1,2-) 156-60-5 100 1,000 <2 <2 <2 <2 <2 –

Dichloropropane (1,2-) 78-87-5 5 200 <2 <2 <2 <2 <2 –

Dichloropropane (1,3-) 142-28-9 NS NS <2 <2 <2 <2 <2 –

Dichloropropane (2,2-) 594-20-7 NS NS <2 <2 <2 <2 <2 –

Dichloropropene (1,1-) 563-58-6 NS NS <2 <2 <2 <2 <2 –

Dichloropropene (cis-1,3-) 10061-01-5 0.5 * ‡ † <2 <2 <2 <2 <2 –

Dichloropropene (trans-1,3-) 10061-02-6 0.5 * ‡ † <2 <2 <2 <2 <2 –

Hexachlorobutadiene 87-68-3 0.5 † <0.5 <0.5 <0.5 <0.5 <0.5 –

Methylene Chloride (Dichloromethane) 75-09-2 5 1,000 <5 <5 <5 <5 <5 –

Tetrachloroethane (1,1,1,2-) 630-20-6 70 † <2 <2 <2 <2 <2 –

Tetrachloroethane (1,1,2,2-) 79-34-5 2 1,000 <2 <2 <2 <2 <2 –

Tetrachloroethene (PCE) 127-18-4 5 80 <2 <2 <2 <2 <2 –

Trichlorobenzene (1,2,3-) 87-61-6 NS NS <1 <1 <1 <1 <1 –

Trichlorobenzene (1,2,4-) 120-82-1 70 1,000 <1 <1 <1 <1 <1 –

Trichlorobenzene (1,3,5-) 108-70-3 40 † <1 <1 <1 <1 <1 –

Trichloroethane (1,1,1-) 71-55-6 200 50,000 <2 <2 <2 <2 <2 –

Trichloroethane (1,1,2-) 79-00-5 5 500 <2 <2 <2 <2 <2 –

Trichloroethene (TCE) 79-01-6 5 100 <2 <2 <2 <2 <2 –

Trichloropropane (1,2,3-) 96-18-4 40 † <2 <2 <2 <2 <2 –

Vinyl Chloride 75-01-4 2 10 <2 <2 <2 <2 <2 –

Other VOCs

Acetone 67-64-1 6,000 † <10 <10 <10 <10 <10 –

Bromobenzene 108-86-1 NS NS <2 <2 <2 <2 <2 –

Bromochloromethane 74-97-5 NS NS <2 <2 <2 <2 <2 –

Bromodichloromethane ¢ 75-27-4 0.6 NA <0.5 <0.5 <0.5 <0.5 <0.5 –

Bromoform ¢ 75-25-2 4 2,000 <2 <2 <2 <2 <2 –

Bromomethane 74-83-9 10 10 <2 <2 <2 <2 <2 –

Butanone (2-) (MEK) 78-93-3 4,000 50,000 <10 <10 <10 <10 <10 –

Carbon Disulfide 75-15-0 70 † <5 <5 <5 <5 <5 –

Dibromo-3-chloropropane (1,2-) (DBCP) # 96-12-8 0.2 † <2 <2 <2 <2 <2 –

Dibromochloromethane ¢ 124-48-1 60 NA <2 <2 <2 <2 <2 –

Dibromoethane (1,2-) (Ethylene dibromide) 106-93-4 0.05 700 <2 <2 <2 <2 <2 –

Dibromomethane (Methylene bromide) 74-95-3 NS NS <2 <2 <2 <2 <2 –

Dichlorodifluoromethane 75-71-8 1,000 † <5 <5 <5 <5 <5 –

Diethyl Ether (Ethyl Ether) 60-29-7 1,400 † <5 <5 <5 <5 <5 –

Diisopropyl ether (DIPE) 108-20-3 120 † <5 <5 <5 <5 <5 –

Dioxane (1,4-) 123-91-1 3 † <50 <50 <50 <50 <50 –

Dioxane (1,4-) 123-91-1 3 † <0.25 0.35 0.28 0.35 0.40 13%

Ethyl tertiary butyl ether (ETBE) 637-92-3 40 † <5 <5 <5 <5 <5 –

Hexanone (2-) 591-78-6 NS NS <10 <10 <10 <10 <10 –

Methyl-2-pentanone (4-) (MIBK) 108-10-1 2,000 50,000 <10 <10 <10 <10 <10 –

Methyl-t-butyl Ether (MTBE) 1634-04-4 13 10,000 <5 <5 <5 <5 <5 –

Tertiary amyl methyl ether (TAME) 994-05-8 140 † <5 <5 <5 <5 <5 –

Tertiary butyl alcohol (TBA) (tert-Butanol) 75-65-0 40 † <30 <30 <30 <30 <30 –

Tetrahydrofuran 109-99-9 154 † <10 <10 <10 <10 <10 –

Trichlorofluoromethane 75-69-4 2,000 † <5 <5 <5 <5 <5 –

Total Metals

Antimony 7440-36-0 6 NA <2 <2 <2 <2 –

Arsenic 7440-38-2 10 NA 1.0 0.6 1.1 1.5 31%

Barium 7440-39-3 2,000 NA 370 240 220 220 0%

Beryllium 7440-41-7 4 NA <2 <2 <2 <2 –

Chromium 7440-47-3 100 NA <2 4 <2 <2 –

Analyte CAS

Nos. GW-1

(AGQS) GW-2 Duplicate

% RPD

Notes: 

1. Samples were collected by Sanborn Head on the dates indicated and analyzed by Eastern Analytical, Inc. (EAI) of Concord, New Hampshire for volatile organic compounds (VOCs) by United States Environmental Protection Agency 

(USEPA) Methods 8260B and 8260B in selective ion monitoring (SIM) mode (low level 1,4-dioxane only), and total (unfiltered) metals by USEPA Method 6020. 

2. "<" indicates the analyte was not detected above the indicated laboratory reporting limit.

3. "GW-1" and "GW-2" Groundwater Standards are from the New Hampshire Department of Environmental Services (NHDES) Contaminated Sites Risk Characterization and Management Policy (RCMP) (January 1998, with 2000 through 

2007 revisions/addenda). In addition, the June 2009 and July 2011 versions of Table 1 in the NHDES Vapor Intrusion Guidance included updates to some GW-2 Groundwater Standards which have been included in this table. GW-1 

Groundwater Standards are equivalent to the Ambient Groundwater Quality Standards (AGQSs) promulgated in Env-Or 600 (July 2008). "‡" indicates the value depicted is the revised AGQS which was raised in the July 2008 update to EnvOr 600. The AGQS/GW-1 Groundwater Standards are intended to be protective of groundwater as a source of drinking water. The GW-2 Groundwater Standards apply to groundwater as a potential source of indoor air contamination. 

4. "AVOCs" are aromatic VOCs. 

 "CVOCs" are chlorinated VOCs. 

 "†" indicates the RCMP lists as not currently available. 

 "NA" indicates the RCMP lists as not applicable. 

 "NS" indicates the analyte is not listed in the RCMP. 

 "ND" indicates not detected. 

 "*" indicates the standard shown is for 1,3-dichloropropene (no isomer specified). 

 "#" indicates the standard shown is for dibromochloropropane (no isomer specified). 

 "¢" indicates the RCMP lists the AGQS for total trihalomethanes (bromoform, bromodichloromethane, dibromochloromethane and chloroform) shall be 80 μg/l if the groundwater is contaminated by chlorinated water supplies. 

5. Bold italic reporting limits do not meet the AGQS/GW-1 Groundwater Standards. However, these are not identified as compounds of concern at this site. 

 Shaded values are detected concentrations. No detected concentrations exceed the AGQS/GW-1 or GW-2 Groundwater Standards. 

6. Duplicate % RPD indicates the relative percent difference as calculated by the following formula: 

 | Result1 - Result2 | / ((Result1 + Result2) / 2) * 100 

7. "–" indicates the RPD can not be calculated because one or both of the results are non-detect. 

8. Refer to Sanborn Head's December 2009 Quality Assurance Project Plan for further details on data quality and data usability. 

S:\CONDATA\2000s\2049.04\Source Files\2012 Annual Report\Att D - DQA\Att D Tbls.xlsx Page 1 of 1 Sanborn, Head & Associates, Inc.
TABLE D-2

Review of Analytical Laboratory QC – Groundwater

Town Garage/Radio Beacon Site – Londonderry, New Hampshire

NHDES Site No. 198509001

Lab

Batch Matrix Analyses EB EB Clean? TB TB Clean? Lab Blank Surrogates MS/MSD LCS/LCSD

VOCs 

Method 

8260B

– –

Trip Blank / 

11-6-12 Yes Clean

Within 

acceptance 

criteria

–

Trichlorofluoromethane LCS (142%R)/LC

(acceptable = 70-13

VOCs 

Method 

8260B-SIM

– –

Trip Blank / 

11-1-12 Yes Clean

Within 

acceptance 

criteria

– Within acceptance c

Total

Metals

–– – – Clean – – Within acceptance c

EAI

116211 GW

Notes: 1. Abbreviations/Acronyms: EAI = Eastern Analytical, Inc. GW = groundwater EB = equipment rinseate blank sample TB = trip blank sample MS = matrix spike sampleMSD = matrix spike duplicate sampleLCS = laboratory control sample LCSD = laboratory control sample duplicate %R = percent recovery %RPD = relative percent difference "

–

" = not applicable 

2. Refer to Sanborn Head's December 2009 Quality Assurance Project Plan for further details on data quality and data usability. 

S:\CONDATA\2000s\2049.04\Source Files\2012 Annual Report\Att D - DQA\Att D Tbls.xlsx Page 1 of 1