# 2010 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

Prepared by Sanborn, Head & Associates, Inc.

File 2049.02 August 2010

## August 25, 2010 File No. 2049.02 Sherilyn B. Young, Esq. Rath, Young and Pignatelli, P.A. P.O. Box 1500 Concord, NH 03302-1500 Re: 2010 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. (SHA) completed a groundwater quality monitoring round at the Town Garage/Radio Beacon Site (site) in May 2010. In addition to the annual monitoringactivities (collection of a Volatile Organic Compound [VOC] groundwater sample at mon itoring well MW-2R), the United States Environmental Protection Agency (USEPA) als o requested that additional groundwater and surface water monitoring be completed at the site. The monitoring was completed in accordance with SHA’s December 2009 Quality Assurance Project Plan (QAPP). 1 

## This report is subject to the limitations in Attachment A.
GROUNDWATER SAMPLING AND ANALYSIS One groundwater sample was collected from monitoring well MW-2R 2

1 

### SHA, December 2, 2009, Quality Assurance Project Plan and Wo rk 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. 

## on May 19, 2010 (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 meas ured with an electric 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 SHA’s December 2009 QAPP. Water quality parameters including temper ature, pH, specific conductance, oxygen reduction potential (ORP), and dissolved oxygen were monitored during purging using an YSI Model 600 XLM multi-parame ter water quality meter with an in -line flow cell. Turbidity was monitored via a sampling port installed prior to th e flow cell using a Hach 2100P turbidity meter. Upon parameter stabilization, the in-line flow cell was disconnected and primary and duplicate

2 

### Replacement monitoring well MW-2R was installed October 30, 2006 as a replacement to monitoring well MW2D-6. The well installation was summarized in the site’s 2006 Annual Summary Report dated January 31, 2006.

### Town Garage/Radio Beacon Site / 2010 Annual Report 2049.02 \ 2010825_ 2010_Annual_Report.docx Page 2 

## groundwater samples were collecte d. A summary of stabilized wate r quality parameter data for the May 2010 round is presented on the Groundwat er Quality Field Sampling Summary form included as Attachment B. Historical water quality parameter data are summarized in Table 1. The groundwater samples were placed in 40-milliliter ( ml) glass vials with Teflon® septa, which were provided, pre-cleaned and pre-preserved with hydrochloric acid (HCl), by the analytical laboratory. 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 fo r volatile organic compound (VOC) analysis by USEPA Method 8260B. The sample was handled and transported following standard chain-ofcustody procedures. A trip blank, prepared befo rehand by EAI, was also analyzed for VOCs by USEPA Method 8260B. A copy of EAI’s analytical laboratory data report for this monitoring round is included as Attachment C. SHA performed an assessment of data quality and usability as described in SHA’s December 2009 QAPP (refer to Attachment D). As indicated above, in addition to the analysis of VOCs at MW-2R, additional groundwater and surface water samples were collected and analyzed in May 2010. These additional analyses consisted of the following:



# x Analysis of a groundwater sample from MW -2R for 1,4-dioxane and arsenic (unfiltered).



# x Analysis of surface water samples from two surface water locations (SW-1 and SW-2) sampled in 1990 as part of the Remedial Investigation (RI). 3



# x Analysis of a surface water reference sample co llected from a ponded surface water area near Thornton Road (approximately 1⁄2-half mile south of the site). The May 2010 Thornton Road reference sample was also analyzed for aluminum, iron, lead, nickel, and zinc. The May 2010 samples collected from SW-1 and SW-2 were analyzed for metals (aluminum, iron, lead, nickel, and zinc) that had exceeded the ambient water quality criteria based on the prior RI sampling.

The additional groundwater and surface water samp ling was a single monitoring event completed at the request of USEPA. Results of the additi onal groundwater and surface water monitoring are included in Attachment E.
SUMMARY OF ANALYTICAL RESULTS As indicated above, SHA performe d an assessment of data quality and usability (Attachment D). Based on this assessment, the data are of su fficient quality for their intended purpose (i.e., comparison to applicable groundwater standards 4 

## ).

3 

### Metcalf & Eddy, March 1992, Final Technical Report of Field Investigation

.
4 

### The applicable groundwater standards for the site are the New Hampshire Department of Hampshire Environmental Services (NHDES) Ambient Groundwater Qu ality Standards (AGQS; which are based on federal Maximum Contaminant Levels [MCLs]) and the NHDE S Contaminated Sites Risk Characterization and Management Policy (RCMP) GW-1 Groundwater Standards.

### Town Garage/Radio Beacon Site / 2010 Annual Report 2049.02 \ 2010825_ 2010_Annual_Report.docx Page 3 

## The May 2010 groundwater quality monitoring resu lts for monitoring well MW-2R indicate that 1,1-dichloroethane (1,1-DCA) and 1,1-dichloroethene (1,1-DCE) were the only VOCs detected in the primary and duplicate samples from MW-2R. The concentration of 1,1-DCA (11 micrograms per liter [ μ g/l] in both the primary and duplicate sample) was below its groundwater cleanup level (81 μ g/l), while the concentration of 1,1-DCE was equal to the groundwater cleanup level (7 μ g/l) in both the primary and duplicate sample. 5 

## The concentrations of the VOCs observed for the May 2010 round are lower thanthe results for the four prior rounds that included well MW-2R, and compared to the historical results for MW-2R and MW-2D-6, are the lowest detected to date for these monitoring locations. A concentration versus time plot for VOCs for MW-2D-6 and MW-2R is presented as Figure 2. Constituent-specific cleanup levels established fo r the site are indicated on the concentration versus time plot.
CLOSING Results of the May 2010 groundwater monitoring at the Town Garage/Radio Beacon Site in Londonderry, New Hampshire indicate improving gr oundwater quality conditions in the vicinity of monitoring well MW-2R, with concentrations of 1,1-DCE detected at a concentration equal to its cleanup level, the lowest con centration recorded since monitoring at this location began in 1994. Historically, groundwater sampling has been completed in November (since 1996), based on requirements of the site’s GMP 6 

## . Because of the timing of the recent sampling round in May 2010, these data served in part as an evaluati on of seasonality in groundwater conditions. Based on the results of the May 2010 sampling, we propose that the next groundwater sampling event be completed in November 2011. Furthermore, as indicated by the results of the May 2010 additional groundwater and surface water monitoring (Attachment E) , the concentrations of 1,4-diox ane and unfiltered arsenic were less than the respective laboratory reporting limits (1 microgram per liter [ μ g/l]) in both the primary and duplicate samples from MW-2R and with the exception of iron at surface water location SW-2 (which exceeded the applicable surface water standards 7

5 

### VOC concentrations in the primary and duplicate samples from MW-2R were equivalent. 

## ), there were no exceedances of the applicable water quality standards for the analytes of interest in sampling requested by USEPA. We note that the elevated iron concentration in surface water at the SW-2 location is potentially related to surface runoff from the Town Garage facility. Based on the results of May 2010 sampling, we do not believ e that additional sampling and analysis of

6 

### Groundwater Management Permit (GMP) No. GWP-198509001-L-003 issued to the Town by the New Hampshire Department of Environmental Services (NHDES), effective October 10, 1997 and last revised November 26, 2007.

7 

### The applicable surface water standards are the Water Quality Criteria (WQC) as defined in NHDES Env-Wq 1703.21.

# Sanborn, Head and Associat es, Inc. Digitally signed by Sanborn, Head and Associates, Inc. DN: cn=Sanborn, Head and Associates, Inc., o=SHA, ou, email=lsmith@sanb ornhead.com, c=US Date: 2010.08.30 15:23:16 -04'00'

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# FIGURESTAX MAP 9 TAX MAP 6TOWN GARAGEPROPERTYFile:Q:\CONCORD\2049.02\dwg\July 2010 Annual Summary\2049_02-Figs.dwg Plot Date: 8-26-10This figure depicts the approximate locations ofthe remaining site monitoring wells MW-2R andMW-6D.Monitoring Well Location Plan2010 Annual Summary ReportGroundwater Monitoring ProgramLondonderry Town Garage/RadioBeacon SiteLondonderry, New HampshireFigure NarrativeFigure 1Date:Reviewed By:Designed By:Drawn By:T. WhiteD. DombrowskyAugust 2010S. Nerney1. This base map was prepared based on a copyof the 400 scale 2007 Town of Londonderry TaxAssessor's Map printed from the Town ofLondonderry websitewww.londonderrynh.org onAugust 8, 2007 and should be consideredapproximate. Refer to the legal property anddeeded easement descriptions for more accurateidentification of Groundwater Management Zone(GMZ) boundaries.2. The location of monitoring well MW-6D isbased on a plan entitled, "Plate 3, Location ofMonitoring Wells, Residential Wells, GeophysicalSurvey Lines and Cross-Sections", from the FinalTechnical Report of Field Investigation, HoltonCircle Remedial Investigation, Londonderry, NewHampshire, prepared by Metcalf & Eddy, Inc.,dated March 1992.3. Monitoring well MW-2R was installed byGeosearch, Inc. of Fitchburg, Massachusetts onOctober 30, 2006 as a replacement to MW-2D-6.MW-2R is included in the current groundwatermonitoring program.4. Monitoring well location MW-6D is the oneremaining deep bedrock well at the siteinstrumented with a dedicated multi-level wellsystem. This system (installed as part of theRemedial Investigation [RI]) was designed andmanufactured 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 a3-inch inside diameter PVC pipe that serves as aconduit for the sample tubes and transducercables. Discrete sample intervals are separatedby inflatable packers, which contain awater-activated material inside a rubber sleeve.SHA had previously collected groundwatersamples from intervals MW-6D-2 and MW-6D-4.MW-6D is not included in the currentgroundwater monitoring program.NotesLegendAPPROXIMATE GROUNDWATER MANAGEMENT ZONE (GMZ) BOUNDARYAPPROXIMATE PROPERTY BOUNDARYAPPROXIMATE TAX MAP BOUNDARYTAX MAP LOT NUMBERREPLACEMENT SHALLOW BEDROCK MONITORING WELL LOCATION ANDDESIGNATION INCLUDED IN THE GROUNDWATER MONITORING PROGRAMAS DESCRIBED IN THE JUNE 2006 REVISED AMENDMENT NO. 2 TO THE SOWAS DESCRIBED IN THE JUNE 2006 REVISED AMENDMENT NO. 2 TO THESOW, THE MONITORING WELL WAS REMOVED FROM THE GROUNDWATERMONITORING PROGRAM AND NOT DECOMMISSIONED6?&21'$7$?V??RULJLQDOV?$QQXDO5HSRUW?0RQ:HOO3ORW[OV?0:53DJHRI 6DQERUQ+HDG	$VVRFLDWHV,QF-DQ -DQ -DQ -DQ -DQ -DQ -DQ -DQ -DQ -DQ -DQ -DQ -DQ -DQ -DQ -DQ -DQ

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# ATTACHMENT A
LIMITATIONS

### Town Garage/Radio Beacon Site / Attachment A 2049.02 \ ATT A.docx August 25, 2010 Page 1 

# A TTACHMENT 

# A L IMITATIONS


## 1. The conclusions and recommendations described in this letter report are based in part on the data obtained from a limited num ber of groundwater and surface water samples from widely spaced explorations. The nature and extent of variations between these explorations may not become evident until further investigation, or re mediation, is initiated. If variations or other latent conditions then appear evident, it will be necessary to re-evaluate the conclusions and recommendations of this letter report.
2. Should additional chemical data , historical information, or hydrogeologic information become available in the future, such info rmation should be reviewed by SHA and the interpretations, conclusions and recommendatio ns presented herein should be modified accordingly.
3. In preparing this letter report, SHA has re lied 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 th ere may have been some degree of overlap in the information provided by these various s ources, we did not atte mpt 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 and surface water sampling locations at times and under conditions stated within the text of the letter report. Note that fluctuations in the level of the groundwater or surface water 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 and surface water may occur due to the passage of time, seasonal water table fluctuations, recharge events, and other factors.
6. The conclusions and recommendati ons contained in this letter report are based in part on various types of chemical data as well as hist orical and hydrogeologic information developed by previous investigators. While SHA has revi ewed that data and information as stated in this letter report, any of SHA’s interpretati ons, conclusions, and recommendations that have relied on that information will be contingent on its validity.
7. The analyses and recommendations contained inthis 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,

### Town Garage/Radio Beacon Site / Attachment A 2049.02 \ ATT A.docx August 25, 2010 Page 2 

## and only to the depths penetrated. They do not necessarily reflect variations that may exist between such locations. The validity of the re commendations is based in part on assumptions SHA has made about conditions at the site. Su ch assumptions may be confirmed only during additional characterization, or remediation. If subsurface c onditions different from those described become evident, the recommendations inthis 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 environm ental practices. No warranty, express or implied, is made.
S:\CONDATA\2000s\2049.02\originals\2010 Annual Report\ATT A.docx

# ATTACHMENT B GROUNDWATER QUALITY FIELD SAMPLING SUMMARY FORM

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S:\CONDATA\2000s\2049.02\originals\2010 Annual Report\20100519 GwQFSS.xlsx Page 1 of 1 Sanborn, Head & Associates, Inc. 

### Date:

)LHOG0HDVXUHPHQWV Sampling Location MW-2R Reference Point TPVC Reference Point Elevation (feet) 355.69 Depth to Water (feet) 2.64 Water Table Elevation (feet) 353.05 Depth to Bottom (feet) 48.5 pH (standard units) 7.0 Specific Conductance ( μ S/cm) 12,200 Temperature (oC) 12.8 Dissolved Oxygen (mg/L) 0.9 Oxidation Reduction Potential (mv) 149 Date of Sample 19-May Sample Time 1330 Comment Reference Number 1,2,3,4,5 &RPPHQWV pH Meter: YSI 600 Conductivity Meter: YSI 600 Water Level Meter: Slope Indicator Other: Hach 2100P Turbidimeter Weather: Light rain, breezy, 50s oF Project Manager: S. Nerney Collector(s): S. Nerney, T. White Project Number: 2049.02 Project Name: Londonderry Town Garage Superfund Site Project Location: Londonderry, New Hampshire May 19, 2010

1. Field duplicate (labeled "Dup-2/05-19-10") collected from location MW-2R. 2. Groundwater monitoring was completed in accordance with SHA’s December 2009 Quality Assurance Project Plan (QAPP). 3. MW-2R was purged using a 3/4-inch diameter bladder pump at flow rates approximately 40 ml/min. The intake of the bladder pump was set at approximately 37 ft below ground surface [bgs], which corresponded to the mid-screen depth. The flow cell volume was approximately 200 ml. 4. Field screening parameters were generally monitored approximately every five minutes during purging. After the field parameters stabilized, primary and duplicate groundwater sampl es were collected. Indicated field parameters were the last stabilized values recorded prior to sample collection. 5. Groundwater samples were analyzed for VOCs, 1,4-dioxane, and arsenic (unfiltered).

# ATTACHMENT C
ANALYTICAL LABORATORY DATA REPORT

# 1 /\ 11 

# I eastern analytical, inc.

# --~,JVLAJ~----------------~~~~~---­ pru!cs\iona' l '· '

.. , {c1·vrcL r Scott Nerney Sanborn , Head 

### & Associates , Inc

. ( NH) 20 Foundry Street Concord , NH 0 3 3 01 Subject: Laboratory Report
Eastern Analytical , Inc

. ID : 

# RECEIVED JUN 02 

# 2010
SH A - Con c or d

89365 Client Identification : Date Received: Londonderry Town Garage (LTG) 1 2049

. 02 5/20/2010

Dear Mr

. Nerney : Enclosed please find the laboratory report for the above identified project. All analyses were performed in accordance with our QA/QC Program

. Unless otherwise stated, holding times , preservation techniques , container types , and sample conditions adhered to EPA Protocol. Samples which were collected by Eastern Ana l ytical , Inc

. (EAI) were collected i n accordance with approved EPA procedures

. Eastern Analytical , Inc

. certifies that the enclosed test results meet all requirements of NELAP and other applicab l e state c ertificat i ons

. Please refer to our website at www

. eailabs

. com for a copy of our NELAP certificate and accred i ted parameters

. The following standard abbreviations and convent i ons apply to all EAI reports : Solid samples are reported on a dry weight basis , unless otherwise noted < : 

### " less than " followed by the reporting l i mit > : 

### " greater than " followed by the reporting limit %R : % Recovery
Eastern Analytical Inc. maintains certification i n the following states : Connecticut (PH

- 0492), Maine (NH005) , Massachusetts (M

- NH005), New Hampshire/NELAP ( 101 2), Rhode Island (269) and Vermont (VT1012).
The following inform a t ion is contained within this report : Sample Conditions summary, Analytical Results/Data, Quality Contro l data (if requested) and copies o f the Chain of Custody

. This report may not be reproduced except in full , without the t he written approval of the l aboratory

. 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 ,

# ~ ( _p Lo rr aine Olashaw , Lab Director Date #of pages (excluding cover l etter)


### Eastern Analytical, Inc.**2~** 

### Clwndl P ,,**~.** 

### Cnn<..•lrd. I\ 

### II 0\ll'l 

## www.cailabs.com lf.l 1101Wl05Z; l-'·0021i7052i**FAXIlC)2Z~W)I**

# SAMPLE CONDITIONS PAGE

Eastern Analytical, Inc

. 10#: 

## 89365 Client: Sanborn , Head & 

### Associates, Inc. (NH) Client Designation: LTG 

## I 2049.02

Temperature upon receipt ( 0 

### C}: 

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

## y
Date Date Sample% Dry LabiD Sample ID Rece ive d Sampled Matrix Weight Exceptions/Comments (other than thermal preservation)
89365

. 01 MW

- 2R /05

- 1 9

- 10 5/20/10 5/19 / 10 aqueous Adheres to Sample Acceptance Policy
89365.02 T B-01 / 05- 1 9-10 5/20/10 4/29/ 10 aqueous Adheres to Samp l e Acceptance Policy
89365

. 03 Dup-2 / 05

- 19

- 10 5/20/ 10 5 / 19 / 10 aqueous Adheres to Sample Acceptance Po l icy

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 reported on an " as received " basis

. All results contained in this report relate only to the above listed 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 W aste S W 846 3rd Edition including updates IVA and /VB 4) Hach Water Analysis Handbook, 2nd edition , 1992 

## eastern analytical, inc. www.eailabs.com P hone : (603} 228-0525 

## 1

# LABORATORY REPORT

Eastern Analyt i cal, Inc. 10# : 

## 89365 Client: Sa n bo rn , Head 

### & Associates, Inc. Client Designation: 

### LTG 

## I 2049.02 (N H ) Sample ID: MW-2R 

### I 05-19 -1 0 TB-01 

### I Dup-21 05-19-10 05-19-10

Lab Sample ID: 89365.01 89365.02 89365.03 Matrix: aqueous aqueous aqueous Date Sampled: 5/19/10 4/29/10 5119/10 Date Received: 5/20/10 5/20110 5/20110 Units: ug/1 ug/1 ug/1 Date of Analysis: 5/24/10 5/24/10 5/24/10 Analyst: BAM BAM BAM Method: 8260B 8260B 82608 Dilution Factor:
Dichlorodifluoromethane <5 <5 <5 Chloromethane <2 <2 <2 Vinyl chloride <2 <2 <2 Bromomethane <2 <2 <2 Chloroethane <5 <5 <5 Trichlorofluorome thane <5 <5 <5 Diethyl E ther <5 <5 <5 Acetone <10 < 10 <10 1, 1 -Dic hloroethene 7 < 1 7 tert-Butyl Alcohol (TBA) < 30 < 30 < 30 Methylene chloride <5 <5 <5 Carbon disulfide <5 <5 <5 Methyl-t-butyl ether(MTBE) <5 <5 <5 Ethyl-t-butyl ether(ETBE) <5 <5 <5 Isopropyl ether(DIPE) <5 <5 <5 tert-amyl methyl ether(TAME) <5 <5 <5 trans-1,2-Dichloroethene <2 <2 <2 1 , 1-Dichloroethane 11 <2 11 2 ,2-Dichloropropane <2 <2 <2 cis-1 ,2-Dich l oroethene <2 <2 <2 2-Butanone(MEK) < 10 < 10 < 10 Bromochloromethane <2 <2 <2 Tetrahydrofuran(THF) < 10 < 10 < 10 Chloroform <2 <2 <2 1, 1,1- Trichloroethane <2 <2 <2 Carbon tetrach loride <2 <2 <2 1, 1-Dichloropropene <2 <2 <2 Benzene < 1 < 1 < 1 1,2-Dichloroethane <2 <2 <2 Trichloroethene <2 <2 <2 1 ,2-Dich loropropane <2 <2 <2 Dibromomethane <2 <2 <2 Bromodichloromethane < 0.5 < 0 .5 < 0.5 4

- Methyl

- 2-pentanone(MIBK) <10 < 10 < 10 cis-1 ,3-D ichloroprope n e <2 <2 <2 Toluene < 1 < 1 < 1 trans-1 ,3-Dichloropr opene <2 <2 <2 1,1 ,2- Trichloroethane <2 <2 <2 2-Hexanone <10 < 10 < 10 Tetrachloroe thene <2 <2 <2 1 , 3-Dichloropropane <2 <2 <2 Dibromochloromethane <2 <2 <2 1 ,2-Dibromoet hane(EDB ) <2 <2 <2 Chlorobenzene <2 <2 <2 1,1, 1 ,2- Tetrachloroethane <2 <2 <2 Et hvlbenzene < 1 < 1 < 1 

## eastern analytical, inc

. www

. eailabs.com Phone: (603) 228-0525 

## 2

# 1~1 LABORATORY REPORT

Eastern Analytical, Inc. 10#: 89365 Client: Sanborn, Head & 

### Associates, Inc. (NH) Client Designation: LTG 

## I 2049.02
Sample ID: MW-2R I 05-19-10 TB-01 I Dup-2 I 05-19-10 05-19-10

Lab Sample ID: 89365.01 89365.02 89365.03 Matrix: aqueous aqueous aqueous Date Sampled: 5119110 4129110 5119110 Date Received: 5120110 5120110 5120110 Units: ugll ugll ug/1 Date of Analysis: 5124110 5124110 5124110 Analyst: BAM BAM BAM Method: 8260B 8260B 8260B Dilution Factor: 1 1**mp~Xylene** < 1 < 1 < 1 a-Xylene < 1 < 1 < 1 Styrene < 1 < 1 < 1 Bromoform <2 <2 <2 lsoPropylbenzene < 1 <1 < 1 Bromobenzene <2 <2 <2 1,1 , 2 ,2- Tetrachloroethane <2 <2 <2 1 ,2,3 -Trichloropropa ne <2 <2 <2 n-Propylbenzene < 1 < 1 < 1 2-Chlorotoluene <2 <2 <2 4-Chlorotoluene <2 <2 <2 1 , 3 ,5-Trimet hylbenz e n e < 1 < 1 < 1 tert-Butylbenzene < 1 < 1 < 1 1 , 2 , 4

- Trimet hylbenzene < 1 < 1 < 1 sec-Butylbenzene < 1 < 1 < 1 1 ,3-Dic hlorobenzene < 1 < 1 < 1 p-lsopropyltoluene <1 < 1 < 1 1 ,4

- Dichlorobenzene < 1 < 1 < 1 1 , 2 -Dic hlorobenzen e <1 < 1 < 1 n-Butylbenzene < 1 < 1 <1 1 ,2 -D ib romo - 3-chlorop ropa ne <2 <2 <2 1 ,3,5-Trichlorobenzene < 1 < 1 < 1 1 ,2,4-Trichlorobenzene < 1 < 1 < 1 Hexachlorobutadiene < 0.5 < 0.5 < 0.5 Nap h thalene <5 <5 <5 1 ,2,3- Trichlorobenzene < 1 < 1 < 1 4-Bromofluorobenzene (surr) 90%R 90%R 89 %R 1 ,2-D ichlorobenze ne - d4 (surr) 109 %R 108 %R 109 %R Toluene-dB (surr) 98%R 93 %R 96%R



# eastern analytical, inc. www
. eailabs

. com Pho n e: (603) 228-0525 

## 3

# lft

_

A

_

nl QC REPORT

Eastern Analytical, Inc. I D#: 89365
Client: Sanborn, Head 

### & Associates, Inc

. Client Designation: 

### LTG 

## I 2049.02

Parameter Name Blank LCS LCSD Analysis Date Units Umits RPD Method

Dichlorodifluoromethane <5 5/24/2010 ug/1 82608 Chloromethane <2 5/24/2010 ug/1 82608 Vinyl chloride <2 5/24/2010 ug/1 82608 Bromomethane <2 5/24/2010 ug/1 82608 Chloroethane <5 5/24/2010 ug/1 82608 Trichlorofluoromethane <5 5/24/2010 ug/1 82608 Diethy l Ether <5 5/2 4 /2010 ug/1 82608 Acetone < 10 5/24/2010 ug/ 1 82608 1 , 1 -Dic hloroethene < 1 21 (107 %R) 21 (106 %R) (1 RPD) 5/24/2010 ug/1 61

- 145 20 82608 tert-8utyl Alcohol (TBA) < 30 5/24/2010 ug/1 82608 Methylene chloride <5 5/24/2010 ug/1 82608 Carbon disulfide <5 5/24/2010 ug/1 82608 Methyl-t-butyl ether(MTBE) <5 5/24/2010 ug/1 82608 Ethyl-t-butyl ether(ET8E) <5 5/24/2010 ug/1 82608 Isopropyl ether(DIPE) <5 5/24/2010 ug/1 82608 tert-amyl methyl ether(T AME) <5 5/24/2010 ug/1 82608 trans-1 ,2-Dichloroethene <2 5/24/2010 ug/1 82608 1 , 1-Dichloroetha ne <2 5/24/2010 ug/1 82608 2,2-Dichloropropane <2 5/24/2010 ug/1 82608 cis-1 ,2-Dichloroethene <2 5/24/2010 ug/1 82608 2-8utanone(MEK) <10 5/24/2010 ug/1 82608 Bromochloromethane <2 5/24/2010 ug/1 82608 Tetrahydrofuran(THF) <10 5/24/2010 ug/1 82608 Chloroform <2 5/24/2010 ug/1 82608 1,1, 1- Trichloroethane <2 5/24/2010 ug/1 82608 Carbon tetrachloride <2 5/24/2010 ug/1 82608 1, 1 -D ichloropropene <2 5/24/2010 ug/1 82608 Benzene < 1 21 (103 %R) 21 (104%R)(1 RPD) 5/24/2010 ug/1 76- 127 20 82608 1 ,2-Dichloroe thane <2 5/24/2010 ug/1 82608 Trichloroethene <2 19 (96 %R) 19 (96 %R) (0 RPD) 5/24/2010 ug/1 71

- 120 20 82608 1 ,2-Dichloropropane <2 5/24/2010 ug/1 82608 Dibromomethane <2 5/24/2010 ug/1 82608 B romod ich loromethane < 0.5 5/24/2010 ug/1 82608 4 -Methyl-2-pentanone(MIBK) < 10 5/24/2010 ug/1 82608 cis-1 ,3-Dichloropropene <2 5/24/2010 ug/1 82608 Toluene < 1 20 (102 %R) 21 (1 05 %R) (3 RPD) 5/24/2010 ug/1 76- 125 20 82608 trans-1 ,3-Dichloropropene <2 5/24/2010 ug/1 82608 1,1 , 2-Trichloroethane <2 5/24/2010 ug/1 82608 2-Hexanone <10 5/24/2010 ug/1 82608 T etrach loroethene <2 5/24/2010 ug/1 82608 1 ,3-Dichlo ropropane <2 5/24/2010 ug/1 82608 Dibromochloromethane <2 5/24/2010 ug/1 82608 1 ,2-Dib romoethane( ED8) <2 5/24/2010 ug/1 82608 Ch l orobenzene <2 20 (99 %R) 20 (101 %R) (2 RPD) 5/24/2010 ug/1 75

- 1 30 20 82608 1.1.1 .2- Tetrachloroethane <2 5/24/2010 UQ/1 82608 

# eastern analytical, inc. www.eailabs.com Phone: (603) 228-0525 

### 4

# llVlAI QC REPORT

Eastern Analytical , Inc. ID#: 

## 89365
Client: S a nbo rn, H ead 

### & A sso ci ates , In c. Client Designation: L TG 

## I 2 0 4 9

. 02

Parameter Name Blank LCS LCSD Analysis Date Units Ethyl benzene < 1 mp-Xylene < 1 o-Xylene < 1 Styrene < 1 Bromoform <2 I soP r opylbenze n e < 1 B r omobe n ze n e <2 1 ,1,2,2-Tetrach l oroetha n e <2 1 , 2,3- Tr i chloropropa n e <2 n -P r opy l benzene < 1 2-C h loroto l uene <2 4-Chloroto l uene <2 1,3,5- Trimethylbenzene < 1 tert-Butylbenzene < 1 1,2 , 4-Trimethylbenzene < 1 sec-Butylbenzene < 1 1 , 3-Dichlorobenzene < 1 p-lsopropyltoluene < 1 1 , 4-Dichlorobenzene < 1 1,2-Dichlorobenzene < 1 n-Butylbenzene < 1 1,2-Dibromo-3-chloropropane <2 1,3,5- Trichlorobenzene < 1 1,2 ,4 -T r ichlorobenzene < 1 H exachlorobutadie n e < 0.5 N ap h t h a l ene <5 1,2,3-Tr i c h l o r obenzene < 1 4-Bromofluorobenzene (surr) 90%R 98%R 100 %R 1 ,2-Dic h lorobenzene-d4 (surr) 1 08 %R 10 1 %R 101 %R Toluene-d8 (surr) 98 %R 99%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. 99%R 5/24/2010 5/24/2010 5/24/2010 5/2 4/2010 5/24/2010 5/2 4/2010 5/24/20 1 0 5/24/20 1 0 5/24/20 1 0 5/24/2010 5/24/2010 5/24/2010 5/24/2010 5/24/2010 5/24/2010 5/24/2010 5/24/2010 5/24/2010 5/24/2010 5/24/2010 5/2 4/2010 5/24/2010 5/24/2010 5/24/20 1 0 5/24/20 1 0 5/2 4/2010 5/24/2010 5/2 4 /2010 5/24/2010 5/2 4/2010

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

. The r e were no exceptions in the analyses, unl ess noted

. • Flagged analyte recoveries deviated from the QAJQC limits

. 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 u g/1 u g /1 u g /1 ug/1 u g /1 % Rec % Rec % Rec Limits RPD

86- 1 1 5 50 80- 1 20 50 70- 1 30 50



## eastern analyt i cal, inc

. www. eailabs.com Phone: (6 0 3) 228-0525 Method
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



## 5

### CHAIN-OF-CUSTODY RECORD 

### Page I 

### of { BoLD FIELDS REQUIRED. PLEASE CIRCLE REQUESTED ANALYsts.

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### YES No NOTES: {IE: SPECIAL 

### DmrnoH lJHITS, BILLING INFO, IF DIFFERENT)

SITE HISTORY :

__________ _ SUSPECTED (ONTAHINATION:

_____ ___ _ 

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# ATTACHMENT D DATA QUALITY / DATA US ABILITY ASSESSMENT

### Town Garage/Radio Beacon Site / Attachment D 2049.02 \ ATT-D.docx August 25, 2010 Page 1 

# A TTACHMENT 

# D DATA QUALITY/DATA USABILITY ASSESSMENT SHA performed an assessment of data quality and usability as described in SHA’s December 2009 Quality Assurance Project Plan 1 

## (QAPP; Refer to Tables D-1 and D-2).



# x A review of field equipment calibration/calibration check data sheets indicated field instruments calibrated correctly and maintained calibration throughout the day.



# x A review of field documentati on indicated field Standard Op erating Procedures (SOPs) were followed appropriately.



# x A review of the analytical data packages pr ovided by the laboratory indicated they were complete and laboratory Quality Control (QC) met applicable criteria, there were no analytes detected in the trip blank, and field duplicate pair (MW-2R/05-19-10 and Dup2/05-19-10) relative percent differences (RPD) met acceptance criteria.



# x As noted in the QAPP, reporting limits fo r cis- and trans-1,3 -dichloropropene, 1,2- dibromochloropropane, and 1,2-dibromoethane did not meet the AGQS/GW-1 Groundwater Standard; however, none of th ese analytes are compounds of concern. Based on the data quality/data usability assessment, the data are of sufficient quality for their intended purpose (i.e., comparis on to applicable groundwater 2 

## and surface water standards 3 

## ).

S:\CONDATA\2000s\2049.02\originals\2010 Annual Report\ATT-D\ATT-D.docx

1 

### SHA, 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.

2 

### The applicable groundwater standards for the site are the New Hampshire Department of Hampshire Environmental Services (NHDES) Ambient Groundwater Quality Standards (AGQS; which are based on federal Maximum Contaminant Levels [MCLs]) and the NHDES Contaminated Sites Risk Characterization and Management Policy (RCMP) GW-1 Groundwater Standards.

3 

### The applicable surface water standards are the Water Quality Criteria (WQC) as defined in NHDES Env-Wq 1703.21.S:\CONDATA\2000s\2049.02\originals\2010 Annual Report\ATT-D\ATT D-DQA Tables.xlsx Page 1 of 2 Sanborn, Head & Associates, Inc. 7$%/(' 5HYLHZRI$QDO\WLFDO5HSRUWLQJ/LPLWV7ULS%ODQNDQG'XSOLFDW H53'±*URXQGZDWHU 7RZQ*DUDJH5DGLR%HDFRQ6LWH±/RQGRQGHUU\1HZ+DPSVKLUH 1+'(66LWH1R &RQFHQWUDWLRQVLQJO 7% 0:5  'XS    92&V $92&V Benzene 71-43-2 5 2,000 <1 <1 <1 – Butylbenzene (n-) 104-51-8 260 † <1 <1 <1 – Butylbenzene (sec-) 135-98-8 260 † <1 <1 <1 – Butylbenzene (tert-) 98-06-6 260 † <1 <1 <1 – Ethylbenzene 100-41-4 700 50,000 <1 <1 <1 – Isopropylbenzene (Cumene) 98-82-8 800 NA <1 <1 <1 – Isopropyltoluene (p-) 99-87-6 260 † <1 <1 <1 – Naphthalene 91-20-3 20 2,000 <5 <5 <5 – Propylbenzene (n-) 103-65-1 260 † <1 <1 <1 – Styrene 100-42-5 100 50,000 <1 <1 <1 – Toluene 108-88-3 1,000 50,000 <1 <1 <1 – Trimethylbenzene (1,2,4-) 95-63-6 330 3,000 <1 <1 <1 – Trimethylbenzene (1,3,5-) 108-67-8 330 1,000 <1 <1 <1 – Xylene (mp-) 108-38-3 106-42-3 NS NS <1 <1 <1 – Xylene (o-) 95-47-6 NS NS <1 <1 <1 – Xylenes (Total) 1330-20-7 10,000 30,000 ND ND ND – &92&V Carbon Tetrachloride 56-23-5 5 40 <2 <2 <2 – Chlorobenzene (Monochlorobenzene) 108-90-7 100 2,000 <2 <2 <2 – Chloroethane 75-00-3 NS NS <5 <5 <5 – Chloroform (Trichloromethane) 67-66-3 70 ¢ 100 <2 <2 <2 – Chloromethane 74-87-3 30 † <2 <2 <2 – Chlorotoluene (2-) 95-49-8 100 † <2 <2 <2 – Chlorotoluene (4-) 106-43-4 NS NS <2 <2 <2 – Dichlorobenzene (1,2-) 95-50-1 600 20,000 <1 <1 <1 – Dichlorobenzene (1,3-) 541-73-1 600 † <1 <1 <1 – Dichlorobenzene (1,4-) 106-46-7 75 50,000 <1 <1 <1 – Dichloroethane (1,1-) 75-34-3 81 10,000 <2 11 11 0% Dichloroethane (1,2-) 107-06-2 5 300 <2 <2 <2 – Dichloroethene (1,1-) 75-35-4 7 1,000 <1 7 7 0% Dichloroethene (cis-1,2-) 156-59-2 70 NA <2 <2 <2 – Dichloroethene (trans-1,2-) 156-60-5 100 NA <2 <2 <2 –

Dichloropropane (1,2-) 78-87-5 5 200 <2 <2 <2 – Dichloropropane (1,3-) 142-28-9 NS NS <2 <2 <2 – Dichloropropane (2,2-) 594-20-7 NS NS <2 <2 <2 – Dichloropropene (1,1-) 563-58-6 NS NS <2 <2 <2 – Dichloropropene (cis-1,3-) 10061-01-5 0.5 * ‡ † <2 <2 <2 – Dichloropropene (trans-1,3-) 10061-02-6 0.5 * ‡ † <2 <2 <2 – Hexachlorobutadiene 87-68-3 0.5 † <0.5 <0.5 <0.5 – Methylene Chloride (Dichloromethane) 75-09-2 5 1,000 <5 <5 <5 – Tetrachloroethane (1,1,1,2-) 630-20-6 70 † <2 <2 <2 – Tetrachloroethane (1,1,2,2-) 79-34-5 2 1000 <2 <2 <2 –

Tetrachloroethene (PCE) 127-18-4 5 80 <2 <2 <2 – Trichlorobenzene (1,2,3-) 87-61-6 NS NS <1 <1 <1 – Trichlorobenzene (1,2,4-) 120-82-1 70 1,000 <1 <1 <1 – Trichlorobenzene (1,3,5-) 108-70-3 40 † <1 <1 <1 – Trichloroethane (1,1,1-) 71-55-6 200 20,000 <2 <2 <2 – Trichloroethane (1,1,2-) 79-00-5 5 500 <2 <2 <2 – Trichloroethene (TCE) 79-01-6 5 90 <2 <2 <2 – Trichloropropane (1,2,3-) 96-18-4 40 † <2 <2 <2 – Vinyl Chloride 75-01-4 2 10 <2 <2 <2 – 2WKHU92&V Acetone 67-64-1 6,000 † <10 <10 <10 – Bromobenzene 108-86-1 NS NS <2 <2 <2 – Bromochloromethane 74-97-5 NS NS <2 <2 <2 – Bromodichloromethane 75-27-4 0.6 ¢ NA <0.5 <0.5 <0.5 – Bromoform 75-25-2 4 ¢ 2,000 <2 <2 <2 – Bromomethane 74-83-9 10 10 <2 <2 <2 – Butanone (2-) (MEK) 78-93-3 4,000 50,000 <10 <10 <10 –

Carbon Disulfide 75-15-0 70 † <5 <5 <5 – Dibromo-3-chloropropane (1,2-) (DBCP) 96-12-8 0.2 # † <2 <2 <2 – $QDO\WH &$6 1RV *: $*46 *: 'XSOLFDWH 53'S:\CONDATA\2000s\2049.02\originals\2010 Annual Report\ATT-D\ATT D-DQA Tables.xlsx Page 2 of 2 Sanborn, Head & Associates, Inc. 7$%/(' 5HYLHZRI$QDO\WLFDO5HSRUWLQJ/LPLWV7ULS%ODQNDQG'XSOLFDW H53'±*URXQGZDWHU 7RZQ*DUDJH5DGLR%HDFRQ6LWH±/RQGRQGHUU\1HZ+DPSVKLUH 1+'(66LWH1R &RQFHQWUDWLRQVLQJO 7% 0:5  'XS    $QDO\WH &$6 1RV *: $*46 *: 'XSOLFDWH 53' Dibromochloromethane 124-48-1 60 ¢ NA <2 <2 <2 – Dibromoethane (1,2-) (Ethylene dibromide) 106-93-4 0.05 700 <2 <2 <2 –

Dibromomethane (Methylene bromide) 74-95-3 NS NS <2 <2 <2 – Dichlorodifluoromethane 75-71-8 1,000 † <5 <5 <5 – Diethyl Ether (Ethyl Ether) 60-29-7 1,400 † <5 <5 <5 – Diisopropyl ether (DIPE) 108-20-3 120 † <5 <5 <5 – Ethyl tertiary butyl ether (ETBE) 637-92-3 40 † <5 <5 <5 – Hexanone (2-) 591-78-6 NS NS <10 <10 <10 – Methyl-2-pentanone (4-) (MIBK) 108-10-1 2,000 50,000 <10 <10 <10 –

Methyl-t-butyl Ether (MTBE) 1634-04-4 13 10,000 <5 <5 <5 – Tertiary amyl methyl ether (TAME) 994-05-8 140 † <5 <5 <5 – Tertiary butyl alcohol (TBA) (tert-Butanol) 75-65-0 40 † <30 <30 <30 – Tetrahydrofuran 109-99-9 154 † <10 <10 <10 – Trichlorofluoromethane 75-69-4 2,000 † <5 <5 <5 –
Notes: 1. Samples were collected by SHA on the dates indicated and analyzed by Easte rn Analytical, Inc. (EAI) of Concord, New Hampshire for volatile organic c ompounds (VOCs) by United States Environmental Protection Agency (USEPA) Method 8260B. 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 Charact erization and Management Policy (RCMP) (January 1998, with 2000 through 2007 revisions/addenda). GW-1 Groundwater Standards are equivalent to the Ambient Groun dwater Quality Standards (AGQSs) promulgated in Env-Or 600 (July 2008). "‡" indicates the value depi cted is the revised AGQS which was raised in the July 2008 update to Env-Or 60 0. 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 groundwate r 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 μ g/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 SHA's December 2009 Quality Assurance Project Plan for further details on data quality and data usability.S:\CONDATA\2000s\2049.02\originals\2010 Annual Report\ATT-D\ATT D-DQA Tables.xlsx Page 1 of 1 Sanborn, Head & Associates, Inc. 

### 7$%/(' 5HYLHZRI$QDO\WLFDO/DERUDWRU\4&±*URXQGZDWHU 7RZQ*DUDJH5DGLR%HDFRQ6LWH±/RQGRQGHUU\1HZ+DPSVKLUH 1+'(66LWH1R

/DE%DWFK 0DWUL[ $QDO\VHV (% (% &OHDQ" 7% 7% &OHDQ" /DE %ODQN 6XUURJDWHV 0606' /&6/&6'

EAI 89365 GW VOCs – – TB-01 / 05-19-10 Yes Clean Within acceptance

criteria – Within acceptance

criteria

Notes: 1. Abbreviations/Acronyms: EAI = Eastern Analytical, Inc. GW = groundwater EB = equipment rinseate blank sample TB = trip blank sample LCS = laboratory control sample LCSD = laboratory control sample duplicate MS = matrix spike sample MSD = matrix spike duplicate sample "–" = not applicable
2. Refer to SHA's December 2009 Quality Assurance Project Plan for further details on data quality and data usability.

# ATTACHMENT E
SUMMARY OF ADDITIONAL GROUNDWATER AND SURFACE WATER MONITORING

# M EMORANDUM

To: Sherilyn B. Young, Esq. – Rath, Young and Pignatelli, P.A.
From: Paul L. Rydel, P.G. Scott R. Nerney, P.E.
File: 2049.02
Date: August 25, 2010
Re: Additional Groundwater and Surface Water Monitoring Town Garage/Radio Beacon Site Londonderry, New Hampshire

On behalf of the Town of Londonderry (Town), Sanborn, Head & Associates, Inc. (SHA) completed the 2010 annual groundwater quality mon itoring event at the Town Garage/Radio Beacon Site (site) in May 2010. In addition to th e annual monitoring activities (collection of a Volatile Organic Compound [VOC] groundwater sample at monitoring well MW-2R), the United States Environmental Protection Agency (USEPA) also requested that additional groundwater and surface water monitori ng be completed at the site. The additional groundwater and surface water samp ling was a single monitoring event completed to provide additional information regarding s ite conditions. Based on changes in groundwater standards since the ROD was issued in 1992, US EPA requested that the sample from MW-2R also be analyzed for arsenic and 1,4-dioxane. Ba sed on results of samples collected during the Remedial Investigation (RI) 1 

## , the USEPA also requested surface water locations be sampled again as the site groundwater nears cleanup levels specified in the Reco rd of Decision (ROD). Furthermore, USEPA requested collection of a surface water sample at a reference location (Thornton Road) in Londonderry, New Hampshire. The additional groundwater and surface water mon itoring described here in was completed in accordance with SHA’s December 2009 Quality Assurance Project Plan (QAPP). 2 

## A discussion of VOC analysis is included in the 2010 Annual Summary Report.

1 

### Metcalf & Eddy, March 1992, Final Technical Report of Field Investigation

.
2 

### SHA, December 2, 2009, Quality Assurance Project Plan and Wo rk 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.

### Town Garage/Radio Beacon Site / Additional Sampling Memo 2049.02 \ 20100825_E_memo.docx August 25, 2010 Page 2 

## GROUNDWATER SAMPLING AND ANALYSIS One groundwater sample was collected from monitoring well MW-2R 3 

## on May 19, 2010 foranalysis of 1,4-dioxane and unfiltered arsenic. Prior to purging/sampling monitoring well MW2R, the groundwater level in the well was measuredwith an electric 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 desc ribed in SHA’s December 2009 QAPP. Water quality parameters including temp erature, pH, specific conductance, oxygen reduction potential (ORP), and dissolved oxygen were monitored during purging using an YSI Model 600 XLM multi-parame ter water quality meter with an in -line flow cell. Turbidity was monitored via a sampling port installed prior to th e 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 collecte d. A summary of stabilized wate r quality parameter data is presented on the enclosed Groundwater Quality Field Sampling Summary. The groundwater samples for 1,4-dioxane analysis were placed in 40-milliliter (ml) glass vials with Teflon® septa, which were provided pre-cleaned by the analytical laboratory. Samples for unfiltered arsenic analysis were placed in 200- milliliter plastic bottles, wh ich were provided, precleaned and pre-preserved with nitric acid (HNO 3 

## ), by the analytical laboratory. Following collection, sample containers were stored in a co oler packed with ice and delivered to Eastern Analytical, Inc. (EAI) of Concord, New Hamp shire, a New Hampshire certified laboratory , for analysis of 1,4-dioxane by USEPA Method 8260B in selective ion monitoring (SIM) mode and unfiltered arsenic by USEPA Method 6020A. The samp les were handled and transported to the laboratory following standard chain-of-custody pr ocedures. A trip blank, prepared beforehand by EAI, was also analyzed for 1,4-dioxane by USEPA Method 8260B in SIM mode. A copy of EAI’s analytical laboratory data report for this monitoring round is attached.
SURFACE WATER SAMPLING AND ANALYSIS On May 19, 2010, surface water samples were co llected from two locations (SW-1 and SW-2) 4 

## sampled as part of the RI. In addition to the RI locations, a reference sample was collected at the Thornton Road reference location as requested by USEPA. Prior to sampling each surface water location, the depth to water and water column thickness were measured from the top of the wooden stake 5

3 

### Replacement monitoring well MW-2R was installed October 30, 2006 as a replacement to monitoring well MW2D-6. The well installation was summarized in the Site’s 2006 Annual Summary Report dated January 31, 2006. 

## using a tape measure marked in hundredths of feet. The surface water samples

4 

### In the RI Investigation, the SW-1 sampling location was referred to as the Wetland Surface Water (located east of the Town Garage Property), and SW-2 was referred to as the Hill Slope Ponded Drainage Water (located north of the Town Garage Property). Analysis of surface water samples from SW-1 and SW-2 completed in 1990 as part of the RI had indicated the metals aluminum, iron , lead, nickel, and zinc at concentration exceeding the ambient water quality criteria.

5 

### On May 12, 2009, USEPA and SHA visited the surface water sampling locations, including the Thornton Road reference location. At each location, a wooden stake with survey flagging was installed to mark the location for future sampling.

### Town Garage/Radio Beacon Site / Additional Sampling Memo 2049.02 \ 20100825_E_memo.docx August 25, 2010 Page 3 

## were collected directly from the surface water bodies using 60-ml disposable syringes prior to filling the laboratory bottles. To evaluate potential artifacts of sampling, field filtered samples were also collected using a 0.45-micron single-use filter. A duplicate sample was collected from location SW-1. The surface water samples were placed in plastic bottles, which were provided pre-cleaned 6 

## by the analytical laboratory. Following collection, samp le containers were stored in a cooler packed with ice and transported to EAI via laboratory courier for analysis. The surface water samples were analyzed for aluminum, ir on, lead, nickel, zinc, (filtered and unfiltered) by USEPA Method 6020A, hardness (unfiltere d) by Standard Method 2340B, and total suspended solids (TSS; unfiltered) by Standard Method 2540D. The samp les were handled and transported following standard chain-of-custody procedures. A copy of EAI’s analytical laboratory data report for this monitoring round is attached. Water quality parameters including temperature, pH, specific conductance, ORP, and dissolved oxygen were monitored using an YSI Model 600 XLM multi-parameter water quality meter. A summary of water quality parame ter data for the May 2010 round is presented on the Surface Water Quality Field Sampling Summary.
SUMMARY OF ANALYTICAL RESULTS SHA performed an assessment of data quality and usability as described in SHA’s December 2009 QAPP (refer to attached tables). Based on th e data quality/data usability assessment, the data are of sufficient quality for their inte nded purpose (i.e., comparison to applicable groundwater 7 

## and surface water standards 8 

## ).
Groundwater As Table 1 indicates, the May 2010 groundwater qua lity monitoring results for monitoring well MW-2R indicate that the concentrations of 1,4-di oxane and unfiltered arsenic were less than the respective laboratory reporting limits (1 microgram per liter [ μ g/l]) in both the primary and duplicate samples.

6 

### Filtered and unfiltered metals and hardness bottles were pre-preserved by the laboratory with nitric acid (HNO 3 

### ); the bottles for total suspended solids analysis were not preserved.

7 

### The applicable groundwater standards for the s ite are the New Hampshire Department of Hampshire Environmental Services (NHDES) Ambient Groundwater Quality Standards (AGQS; which are based on federal Maximum Contaminant Levels [MCLs]) and the NHDES Contaminated Sites Risk Characterization and Management Policy (RCMP) GW-1 Groundwater Standards.

8 

### The applicable surface water standards are the Water Quality Criteria (WQC) as defined in NHDES Env-Wq 1703.21.

### Town Garage/Radio Beacon Site / Additional Sampling Memo 2049.02 \ 20100825_E_memo.docx August 25, 2010 Page 4 

## Surface Water The following summarizes the results of May 2010 surface water sampling requested by USEPA (refer to Tables 2.a and 2.b). As indicated above, the surface water samples were analyzed for hardness to allow comparison of con centrations of select analytes (i.e., lead, nickel, and zinc) to the Fresh Water Aquatic Life Water Quality Criteria (WQC) 9 

## . To evaluate potential artifacts of sampling, filtered and un filtered surface water samples were collected. Filtered concentrations were less than unfiltered concentrations. The unfiltered samples were also analyzed for TSS. The results of this analysis are summarized below:



# x SW-1: Aluminum, iron, lead, nickel, and zinc werenot detected at concentrations above the Fresh Water Aquatic Life WQC.



# x SW-2: The concentration of iron in the unfiltered sample was greater than in the filtered sample, which was greater than the Fresh Water Aquatic Life WQC. Aluminum, nickel, lead, and zinc were not detected at concentrations above the Fresh Water Aquatic Life WQC.



# x Thornton Road Reference Location: Aluminum, ir on, lead, nickel, and zinc were not detected at concentrations above the Fresh Water Aquatic Life WQC. CLOSING Results of the May 2010 additional groundwater and surface water monitoring at the Town Garage/Radio Beacon Site in Londonderry, New Hampshire indicate that with the exception of iron at surface water location SW-2 (which exceeded the Fresh Water Aquatic Life WQC), there were no exceedances of the applicable water quality standards for the analytes of interest in sampling requested by USEPA. We note that the elevated iron concentration in surface water at the SW-2 location is potentially related to surface runoff from the Town Garage facility. Based on the results of this investigation, we do not believe that additiona l sampling and analysis of groundwater for arsenic and 1,4-dioxane at MW-2R or surface water samples from SW-1 and SW-2 is necessary. SRN/PLR:tmw Encl. Tables 1, 2.a and 2.b Figure 1 Attachments: Groundwater Quality Field Sampling Summary Surface Water Quality Field Sampling Summary Analytical Laboratory Reports Data Quality / Data Usability Assessment (and supporting tables) S:\CONDATA\2000s\2049.02\originals\2010 Annual Report\ATT-E\20100825_E_memo.docx

9 

### The Fresh Water Aquatic Life WQC were the same as the Ambient Water Quality Criteria used in the RI. Fresh Water Aquatic Life values for lead, nickel, and zinc are hardness dependent.

# TABLES

### TABLE 1 Summary of Analytical Results – Groundwater Town Garage/Radio Beacon Site Londonderry, New Hampshire

NHDES Site No. 198509001

S:\CONDATA\2000s\2049.02\originals\2010 Annual Report\ATT-E\ATT_E-Tables.xlsx Page 1 of 1 Sanborn, Head & Associates, Inc. 

### Concentrations in μ g/l. MW-2R 05/19/10 05/19/10 Dup. Dioxane (1,4-) 3 † <1 <1 Arsenic 10 NA <1 <1 GW-2 Analyte GW-1 (AGQS)

Notes: 1. Samples were collected by SHA on the date indicated and analyzed by Eastern Analytical, Inc. of Concord, New Hampshire for 1,4-dioxane United States Environmental Protection Agency (USEPA) Method 8260B in selective ion monitoring (SIM) mode, and unfiltered arsenic by USEPA Method 6020A. 2. Concentrations are presented in micrograms per liter ( μ g/l) which are equivalent to parts per billion (ppb). 3. "<" 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 Sites Risk Character ization and Management Policy (RCMP) (January 1998, with 2000 through 2007 revisions/addenda). GW-1 Groundwater Standards are equivalent to the Ambient Groundwater Quality Standards (AGQSs) promulgated in Env-Or 600 (July 2008). 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. 5. "†" indicates the RCMP lists as not currently available. "NA" indicates the RCMP lists as not applicable.

### TABLE 2.a Summary of Analytical Results – Surface Water – Non-Hardness Dependent Metals Town Garage/Radio Beacon Site Londonderry, New Hampshire

NHDES Site No. 198509001

S:\CONDATA\2000s\2049.02\originals\2010 Annual Report\ATT-E\ATT_E-Tables.xlsx Page 1 of 1 Sanborn, Head & Associates, Inc. 

### Concentrations in μ g/l
SW-1 (Wetland Surface Water) SW-2 (Hillslope Ponded Drainage Water) Thornton Road Reference
Acute Chronic 12/13/90 12/13/90 Dup. 05/19/10 05/19/10 Dup. 12/13/90 05/19/10 05/19/10 Unfiltered Aluminum 750 87 

### 460 541 <50 <50 

### 5,590 50 50 Iron NS 1,000 

### 962 1,110 160 230 1,330 12,000 70 Total Suspended Solids 

### 41,000 250,000 49,000 18,000 Filtered Aluminum 750 87 <50 <50 <50 <50 Iron NS 1,000 <50 <50 

### 8,900 <50 Lead 14 † 0.54 † <0.5 <0.5 <0.5 <0.5 Nickel 144.9 † 16.1 † 

### 11 8 1

Zinc 36.2 † 36.5 † <5 <5 

### 10 8 Analyte Water Quality Criteria for Fresh Water

Aquatic Life

Notes: 1. Analytical data for samples collected in 1990 were taken from Table 6-148 and Appendix T - Analytical Data – Surface Water/Sediment from a report entitled, "Final Technical Report of Field Inve stigation," dated March 1992 prepared by Metcalf & Eddy. Samples collected in May 2010 were collected by SHA personnel and submitted to Eastern Analytical, Inc. of Concord, New Hampshire for analysis of filtered and unfiltered metals by USEPA Method 6020A, and total suspended solids by Standard Method 2340D. 2. Results are presented in micrograms per liter ( μ g/l) which are equivalent to parts per billion (ppb). "<" indicates the analyte was not detected above the listed laboratory reporting limit. "J" indicates the quantitation is approximate. 3. "Water Quality Criteria" refers to the New Hampshire Water Quality Criteria for Toxic Substances as defined in Env-Wq 1703.21 (May 2008). "Acute" refers to the acute criteria for the protection of aquatic life in fresh water. "Chronic" refers to the chronic criteria for the protection of aquatic life in fresh water. "†" Refer to Env-Wq 1703.21 for additional notes for these criteria.
4. Bold values exceed the NHDES Freshwater Acute Criteria. Shaded values exceed the NHDES Freshwater Chronic Criteria.TABLE 2.bSummary of Analytical Results – Surface Water – Hardness Dependent Metals (Unfiltered)Town Garage/Radio Beacon SiteLondonderry, New HampshireNHDES Site No. 198509001S:\CONDATA\2000s\2049.02\originals\2010 Annual Report\ATT-E\ATT_E-Tables.xlsxPage 1 of 1Sanborn, Head & Associates, Inc.Concentrations inμg/lSW-1(Wetland Surface Water)SW-2(Hillslope PondedDrainage Water)Thornton RoadReference12/13/90 12/13/1990 Dup. 05/19/10 05/19/10 Dup. 12/13/90 05/19/10 05/19/10Total Hardness (as CaCO3)74,165 74,206 48,000 46,000 248,268 130,000 26,000LeadAcute Hardness Adjusted WQC 56 56 32 30 260 114 15Chronic Hardness Adjusted WQC 2.2 2.2 1.2 1.2 10.1 4.4 0.57Analytical Result5.7J6.4J<0.5 <0.5 9.9 <0.5 <0.5NickelAcute Hardness Adjusted WQC 364 365 252 243 1,013 586 150Chronic Hardness Adjusted WQC 41 41 28 27 113 65 17Analytical Result<4 <4 1 1 21.2 8 <1ZincAcute Hardness Adjusted WQC 93 93 64 62 259 150 38Chronic Hardness Adjusted WQC 93 93 64 62 259 150 38Analytical Result<17.5 <20.5 9 <5 115 12 <5AnalyteNotes:1. Analytical data for samples collected in 1990 were taken from Table 6-148 and Appendix T - Analytical Data – Surface Water/Sediment from a report entitled, "Final TechnicalReport of Field Investigation," dated March 1992 prepared by Metcalf & Eddy.Samples collected in May 2010 were collected by SHA personnel and submitted to Eastern Analytical, Inc. of Concord, New Hampshire for analysis of unfiltered metals byUSEPA Method 6020A and total hardness as CaCO3by USEPA Method 6020A and Standard Method 2340B.2. Results are presented in micrograms per liter (μg/l) which are equivalent to parts per billion (ppb)."<" indicates the analyte was not detected above the listed laboratory reporting limit."J" indicates the quantitation is approximate.3. "Acute WQC" and "Chronic WQC" refer to the acute and chronic criteria (respectively) for the protection of aquatic life in fresh water adjusted for hardness as indicated in theNew Hampshire Water Quality Criteria for Toxic Substances as defined in Env-Wq 1703.21 (May 2008). These values were calculated in accordance with Env-Wq 1703.22(f) andEnv-Wq 1703.24. Env-Wq 1703.22(f) indicates that the freshwater aquatic criteria for select metals correspond to a total hardness of 25,000μg/l and that to calculate aquatic lifecriteria for other hardness values between 25,000 and 400,000μg/l the equations shown in Env-Wq 1703.24 are to be used. Refer to Env-Wq 1703 for further information on thesecalculations (http://des.nh.gov/organization/commissioner/legal/rules/documents/env-wq1700.pdf).4. No detected values exceed the applicable acute hardness adjusted WQC.Shaded values exceed the applicable chronic hardness adjusted WQC.5. For RI data (December1990), the hardness was calculated by using recorded calcium and magnesium concentrations and the following equation (from Drever, J.I., 1997,TheGeochemistry of Natural Waters,Prentice Hall: Upper Saddle River, NJ, 436 pp):Equivalent CaCO3(μg/l) = [2.5 * milligrams of calcium/liter + 4.1 * milligrams of magnesium/liter] * 1,000

# FIGURESW-2SW-1TownGarage SiteMW-2RTownGarage SiteGroundwaterManagementZoneSW-2SW-1Thornton RoadMW-6D-2,4MW-2RGMP Groundwater SamplingLocationGroundwater Monitoring Well (notsampled as part of the GMP)1990 Remedial InvestigationSurface Water Sampling LocationSurface Water ReferenceSampling Location(Locations should be considered approximate)File:Q:\CONCORD\2049.02\dwg\July 2010 Annual Summary\2049_02-Figs.dwg Plot Date: 8-26-10LegendThis figure depicts approximate groundwater andsurface water sampling locations at the TownGarage/Radio Beacon Site in Londonderry, NewHampshire. Historical groundwater and surface watersampling locations were located based on informationderived from the 1992 Remedial Investigation (RI) ofthe site.Based on results of samples collected during the RI,the U.S. Environmental Protection Agency (USEPA)requested surface water locations be sampled againas the site groundwater nears cleanup levelsspecified in the Record of Decision (ROD). USEPAalso requested collection of a surface water sample ata reference location (Thornton Road) inLondonderry,New Hampshire. The inset photographs on the figureindicate surface water locations staked by USEPAand SHA during a May 2009 site visit.Based on changes in groundwater standards sincethe ROD was issued in1992, USEPA requested thatthe sample from MW-2R also be analyzed for arsenicand 1,4-dioxane.Groundwater and Surface WaterSampling LocationsLondonderry, New HampshireFigure NarrativeFigure 1Date:Reviewed By:Designed By:Drawn By:T. WhiteD. DombrowskyAugust 2010S. NerneyMW-2RStaked ThorntonRoad LocationStaked SW-2LocationStaked SW-1LocationNotes:1. Sanborn, Head & Associates, Inc. (SHA) downloaded the2003 digital orthophoto quadrangle, original scale1:12,000, from the New Hampshire GeographicallyReferenced Analysis and Information Transfer System(NH Granit) Website. The original source of thephotograph is the Complex Systems Research Center(CSRC) at the University of New Hampshire.2. Microsoft Virtual Earth(TM) imagery available throughESRI's ArcGIS Online services. Image courtesy of NASA,(c)2009 Microsoft Corporation (c)2009 NAV/TEQ (c)2009 Pictometry International Corp.3. Insert photographs were taken during SHA's May 2010site visit.ThorntonRoadAdditional Groundwater and SurfaceWater SamplingLondonderry Town Garage/RadioBeacon SiteMW-2RSW-1Photo 1Photo 2Photo 3Photo 4MW-6D-2,4

# ATTACHMENTS

### Groundwater Quality Field Sampling Summary

S:\CONDATA\2000s\2049.02\originals\2010 Annual Report\20100519 GwQFSS.xlsx Page 1 of 1 Sanborn, Head & Associates, Inc. 

### Date:

Field Measurements Sampling Location MW-2R Reference Point TPVC Reference Point Elevation (feet) 355.69 Depth to Water (feet) 2.64 Water Table Elevation (feet) 353.05 Depth to Bottom (feet) 48.5 pH (standard units) 7.0 Specific Conductance ( μ S/cm) 12,200 Temperature (oC) 12.8 Dissolved Oxygen (mg/L) 0.9 Oxidation Reduction Potential (mv) 149 Date of Sample 19-May Sample Time 1330 Comment Reference Number 1,2,3,4,5 Comments pH Meter: YSI 600 Conductivity Meter: YSI 600 Water Level Meter: Slope Indicator Other: Hach 2100P Turbidimeter Weather: Light rain, breezy, 50s oF Project Manager: S. Nerney Collector(s): S. Nerney, T. White Project Number: 2049.02 Project Name: Londonderry Town Garage Superfund Site Project Location: Londonderry, New Hampshire May 19, 2010

1. Field duplicate (labeled "Dup-2/05-19-10") collected from location MW-2R. 2. Groundwater monitoring was completed in accordance with SHA’s December 2009 Quality Assurance Project Plan (QAPP). 3. MW-2R was purged using a 3/4-inch diameter bladder pump at flow rates approximately 40 ml/min. The intake of the bladder pump was set at approximately 37 ft below ground surface [bgs], which corresponded to the mid-screen depth. The flow cell volume was approximately 200 ml. 4. Field screening parameters were generally monitored approximately every five minutes during purging. After the field parameters stabilized, primary and duplicate groundwater sampl es were collected. Indicated field parameters were the last stabilized values recorded prior to sample collection. 5. Groundwater samples were analyzed for VOCs, 1,4-dioxane, and arsenic (unfiltered).

### Surface Water Quality Field Sampling Summary

S:\CONDATA\2000s\2049.02\originals\ 2010 Annual Report\ATT-E\20100519 SWQFSS.xlsx Page 1 of 1 Sanborn, Head & Associates, Inc. 

### Project Number: 2049.02 Project Name: Project Location:

Field Measurements Sampling Location Ref SW-1 SW-2 Collector(s) S. Nerney/T. White S. Nerney/T. White S. Nerney/T. White Reference Point TOS TOS TOS Depth to Water (feet) 2.5 2.55 1.95 Depth to Stream Bed (feet) 2.75 2.85 2.65 Thickness of Water Column (DTSB-DTW) 0.25 0.30 0.70 pH (standard units) 6.4 6.6 6.2 Specific Conductance ( μ S/cm) 88 320 4,978 Temperature (oC) 11.6 11.5 11.7 Dissolved Oxygen (mg/L) 6.9 7.9 6.3 Oxidation Reduction Potential (mv) 165 162 59 Date of Sample 19-May 19-May 19-May Sample Time 0920 1000 1035 Comment Reference Number 1,3,4,5 2,3,4,5 3,4,5 Comments

Project Manager: S. Nerney Weather: Light rain, breezy, 50s oF Measurement Device: YSI 600 XLM Londonderry Town Garage Superfund Site Londonderry, New Hampshire Date: May 19, 2010

1. Thornton Road reference location. 2. Field duplicate (labeled "Dup-1/05-19-10") collected from location SW-1. 3. Surface water monitoring was completed in accordance with SHA’s December 2009 Quality Assurance Project Plan (QAPP). 4. The surface water samples were collected from the surface water bodies using 60-ml disposable syringes prior to filling the laboratory bottles. To evaluate potential artifacts of sampling, field filtered samples were also collected using a 0.45-micron single-use filter. 5. Field parameters were measured i n-situ at the sampling location. 6. The surface water samples were analyzed for aluminum, arsenic, iron, lead, nickel, zinc, (filtered and unfiltered) by USEPA Method 6020A, total hardness (unfiltered) by Standard Method 2340B, and total suspended solids (unfiltered) by Standard Method 2540D. TOS = Top of Stake

# e stern an lytical, inc.**~------~~---------- --** **~~ ~\M:** **-- ~----** **f-Jr_o_0~e-S-\t~(J_n_a~l-!~a~h-o•r•a-tr-~1-~--~-e-rt-Jt_c_c-,----** 

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Subject: Laboratory Report Eastern Analytical, Inc. ID: 89363 Client Identification: LTG 1 

### 2049.02 Date Rece i ved: 5/20/2010
Report revision/reissue: 

### Revision, replaces report dated 5 / 28 / 10
Revision information: 

### Reporting Lim i ts for Metals have been rev i sed.

Dear Mr. Nerney: Enc l osed please find the l aboratory report for the above i dentified project. All analyses were performed in accordance with our QA/QC 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

. ea i labs.com for a copy of our NELAP certificate and accredited parameters

. The following standard abbrev i ations and conventions apply to all EAI reports: Solid samples are reported on a dry weight bas i s , 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 (NH005) , Massachusetts (M-NH005), New Hampshire/ NELAP ( 1012 ), Rhode Island ( 269 ) and Vermont (VT1012).
The following informat i on i s conta i ned with i n this report : Samp l e Conditions sum m ary , Analytica l Resu l t s/ Data , Quali ty C ontro l data ( if requested ) and copies of the Cha i n of Custod y. Th i s report ma y not be reproduced except i n fu ll, w i thout 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 samp l e(s) 30 days from the sample receipt date

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

. Sincerely ,

Lorra i ne Olashaw , Lab Director Date #of pages (excluding cover letter)**Ea~tern** 

### Analync:al, 

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# SAMPLE CONDITIONS PAG E

Eastern Analytical, Inc. ID# : 

## 89363 Client: Sanborn, Head 

### & A ssoc iates , Inc. (NH) Client Designation: LTG 

## I 2049.02

T e mperature upon receipt ( 0 

### C): 

## 2

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

## y
Date Date Sample 

### % Dry LabiD Sample ID Received Sampled Matrix Weight Exceptions/Comments (other than thermal preservation) 89363

. 01 Ref/ 05-19

- 10 5/20/1 0 5/19/1 0 aqueous Adheres to Sample Acceptance Policy

Samples were properly preserved and the pH measured when applicable unless otherwise noted. Analysis of solids for pH, Flashpoint , lgnitibi/ity, Pa in t Filter. Corrosivity , Conductivity and Specific Gravity are reported on an " as received • basis

. All results contained in this report relate only to the above listed 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 /VB 4) Hach Water Analysis Handbook, 2nd edition, 1992 

## eastern analytical, inc. WWIN .eaila bs.com Phone: (603) 228-0525 

## 1

# LABORATORY REPORT

E as t e rn An a lytic a l , Inc. 10 #: 

## 893 6 3 Client: Sanbo rn , H ead & 

### Associates, I n c. Client Designation : LTG 1 

### 20 4 9.0 2 (NH)



# --- Sample ID : Ref I 05-19-10

Lab Sample ID: 89363.0 1 Matr i x: aqueous Date Sampled: 5/ 1 9/10 Date Received : 5/20/10
Solids Sus p ended 1 8



## e ast e rn a n a lytical , inc. www. eailabs. com Analysis Units Date T ime Method An a lys t mg/L 5/25/1 0 8:11 2540D J CC

Phone: (6 03) 228- 0525 

## 2

# QC R EP OR T

Easte rn A n a l ytica l , I nc

. 1 0#: 

## 89363
Client: Sanborn, Head & Associates, Inc. Client Designation : LTG 1 

### 2049

. 02

Date of 

### Parameter Name Blank LCS LCSD Units Analysis Limits RPD Method

Solids Suspended <5 

### 100 ( 100 % R) 94 (94 % R) (6 RPD) mg/L 5/25/1 0 90

- 110 20

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 fre e of contamination at the reporting limits

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

. Exce ptions t o the above statements are flagged or noted above or o n the QC Narrative page

. * Flagged a n alyte recoveries deviated from t he QNQC li mits.



## easter n a n a l yt i ca l , i nc. WNW.eailabs .co m Phone : (603) 228-0525 

### 25400



## 3

# 1~1 L AB ORA TORY REPORT

E a stern A n alytica l , Inc

. ID # : 89363 Client: Sa nb o rn , Head & 

### Assoc iat es, I n c

. (N H ) Client Designat ion: LTG 1 2049.02

Samp l e 10: Ref/05-19 -10

Lab Sample 10: 89363

. 01 Matrix: aqueous Date Sampled: 5/19/10 Analytical Da t e of Date Received: 5/20/10 M atrix Un i t s Analysis M ethod Analyst
A l uminum 

### 0.05 AqTot mg/L 5/21/ 1 0 6020 OS A l uminum < 0.05 AqOis mg/L 5/ 2 1/ 1 0 6020 OS I ron 

### 0. 0 7 AqTot mg/L 5/21/ 1 0 6020 OS Iron < 0

. 05 AqDis mg/L 5/21/10 6020 OS Lead < 0

. 0005 AqTot mg/L 5/21/10 6020 OS Lead < 0.0005 AqOis mg/L 5/21/10 6020 OS Nickel < 0

. 001 AqTot mg/L 5/21/10 6020 OS Nickel 

### 0.001 AqDis mg/L 5/21/10 6020 OS Zinc < 0.005 AqTot mg/L 5/21/10 6020 OS Zinc 

### 0.008 AqOis mg/L 5/21/10 6020 OS Tota l Hardness (as CaC03) 

### 2 6 AqTot mg/L 5/21/10 6020 OS



## eastern ana ly t i ca l , inc

. www

. eailabs.com Phone: (603) 228

- 0525 

### 4

# QC REPORT

E aste rn Analytical, Inc. ID # : 

## 89363 Client: Sanborn , Head 

### & Associates , Inc. (NH) Client D es i gnation : 

### LTG 

## I 2049.02

D a te of Parameter Name Blank LCS LCSD Units Analy si s Limits

A l umin um < 0.05 1 2(1 0 8%R) m g / L 5/2 1 / 1 0 80

- 1 20 I ron < 0

. 05 11 (9 9 %R) mg/ L 5/21/ 1 0 80- 12 0 Lead < 0.0005 1.0 (100 % R) mg/L 5 / 21/10 80

- 120 Nickel 0

. 001 0

. 94 ( 9 4 % R ) mg/L 5 / 21 / 10 80- 120 Zinc < 0

. 005 0.89 (89 % R) mg/ L 5/21/10 80- 120

MS / MSD M S/ MSD D a te of Parameter Name Parent 10 Pare nt Matr i x S p i k e MSD Units Analy s is Limits

Alu min u m 8931 7. 0 2 < 0

. 0 5 1 2 (112 %R) 12 ( 111 %R) ( 1 R P D) I ron 893 1 7.02 1

. 3 1 2 (98 % R) 12 (98 %R) (0 RPD) Lead 89317

. 02 < 0

. 0005 0

. 94 (94 % R) 0

. 95 (95 % R) ( 1 RPD) Nickel 89317

. 02 0

. 001 1

. 1 ( 105 % R) 0

. 98 ( 98 % R ) ( 7 RPD) Zinc 89317.02 < 0

. 005 1.0 (99 % R) 0

. 97 (97 % R) (2 RPD)

Samples wer e ana l yzed w it hi n h o l d ing t i mes unless no ted on the sample resu l ts page

. Instrume n tatio n was calibrate d i n accordance with the method requi r ements

. The me t hod blanks were free of contam i na t ion at the r eport i ng limits

. The associated matrix spikes and / or Laboratory Control Samp l es met the a bove stated cr i teria. Exceptions to the above statem e nts are flagged or noted above or on the QC Narrative page

. • Flagge d a nalyte recoveries deviated from the QAIQC l imits

. m g/ L 5/2 1 / 1 0 7 5-12 5 mg/L 5/2 1 /10 75- 1 25 mg/L 5/21 / 10 75-125 mg / L 5 / 21 / 10 75-125 mg/L 5/21/10 75-125 RPD

20 20 20 20 20

RPD

20 20 20 20 20



## eastern analytical, inc. www

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Method

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# ------~~t--------------------------------------p-r-o~/~(-L,-.,~o-n-.z~L-l~a~h-o~ra~t-o_r_;-,~-------- RECEIVED Scott N erney Sanborn , Head & Associates, Inc. ( NH ) 

# JUN 14 2010 20 Foundry Street Concord NH 03301 

## SHA - Co n cor d

Subject: Labo ratory Report Eastern Analytical , I nc. I D : 89366 Clien t Identification: LTG 1 

### 2049

. 02 Date Received : 5/20/ 20 1 0
Report revision/reissue : 

### Revision , rep l aces report dated 6 / 2

/ 10
Revision informati o n: 

### Reporting Limits for Metals have been revised.

Dear Mr. Nerney : Enc l osed p l eas e find t h e l aborato ry r ep ort for the above i dentified project. Al l ana ly ses were performed in accorda n ce with our 

### ONQC Pro g ram. Un l ess otherwise stated, holding times, preservation techniques , contai ner types, and samp l e conditions ad h ered to EPA Protocol. Samples which were collected by Eastern Analytical , Inc. (EA I ) were col l ected in accordance w i th approved EPA procedures

. Eas t ern Analytical , I nc

. 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 cert i ficate and accredited parameters

. The follow i ng standard abbreviations and conventions apply to all EAI reports: Solid samples are reported on a dry weight ba s is , unless otherwise noted < : 

### " les s than " followed by the reporting l i mit > : 

### " greater than " followed by the reporting lim it %R : % Recov ery Eastern Analytical Inc

. maintains ce rtif ication in the following states : Connecticut (PH-0492) , Maine (NH005) , Massachusetts (M-NH005) , New Hampshire / NELAP (1012 ), Rhode Island (269 ) and Vermont (VT 1 012)

. The following information is conta i ned within this report : Sample Conditions summary , Analytical Results/ Data , Qua li ty Control data ( if requested ) and copies of the Cha i n of Custody

. This report may not be reproduced except in full , w i thout the the wr i tten approval of the laboratory

. If yo u have any questions r egarding the res ult s contained within , please feel free to directly con tact me o r the chemis t (s) who performed the testing in question. Un l ess otherwise requested, we will dispose of the sample(s) 30 days from the sample receipt date.
We app re ciate this opportunity to be of service and look forward to you r continued patronage

. Sincerel y,

Lorraine O l ashaw, Lab Di rector Date #of pages (exclud i ng cover letter) 

### Eastern 1 

### muyucal, Inc. 1.1 \. 

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## SAMPLE CONDITIONS PAGE

Eastern Analytical , Inc

. ID #: 

## 89366 Client: Sanborn , H ead & 

### Associates , Inc. (N H ) Client Designation: LTG 

## I 2049.02

Temperature upon r eceip t ( ° C): 

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

## y

Date Date Sample % Dry LabiD Sample ID Received Sampled Matrix Weight Exceptions/Comments (other than thermal preservation)
89366.01 MW-2R I 05-19-10 5120110 5/19/10 aqueous Adheres lo Sample Acceptance Policy
89366.02 Dup -21 05-19-10 5120/10 5119110 aqueous Adheres to Sample Acceptance Policy
89366

. 03 TB-2/ 05-19-10 5120110 5110110 a qu eous Adheres to Sample Acceptance Policy Bubble in o n e vial 89366.04 SW-21 05-19-10 5120110 5119/10 aqueous Adheres to Sample Acceptance Policy
89366.05 SW-11 05-19-10 5120110 5119110 aqueous Adheres to Sample Acceptance Policy
89366.06 Dup-1 I 05-19-10 5/20/10 5119/10 aqueous Adheres to Sample Acceptance Policy

Samples were properly preseNed and the pH measured when applicable unless otherwise noted. Analysis of solids for pH, Flashpoint, lgnitibility, Paint Filter, Corrosivity, Conductivity and Specific Gravity are reported on an "as received" basis. All results contained in this report relate only to the above listed samples. References include: 1) EPA 600/4-79-020, 1983 2) Standard M e th ods for Examination of Water and Wastewat er: lnorganics , 19th Edition, 1995; Microbiol og

y, 20th Edition, 199 8 3) Test M ethods for Evaluating Solid W as te SW 846 3rd Edition including upd ates IVA and /VB 4) H ac h Water Analysis Handbook, 2nd edition, 1992 

## eastern analytical, inc. www.eailabs.com Phone: (603) 228-0525 

## 1

# l lVlA I

. LAB ORA TORY REPORT

Eastern Analytical, Inc

. 10 # : 

## 89366 C l ient: Sanborn, Head 

### & Associates, Inc

. 

### Client Designation: 

### LTG 

## I 2049.02 (NH) Sample ID : MW-2R I 05-19-10 Dup-2/ T8-2/ 05-19

- 10 05-19- 10

Lab Sample ID: 89366.01 89366

. 02 89366.03 Matrix : aqueous aqueous aqueous Date Sampled: 5/19/10 5/19/10 5/10/10 Date Received : 5/20/10 5/20/10 5/20/10 Units: ug/1 ug/ 1 ug/1 Date of Analysis: 5/26/10 5/26/10 5/26/10 Analyst: 

### VG VG VG Method: 82608 SIM 82608 SIM 82608 SIM Dilution Factor: 1 1,4-Dioxane < 1 < 1 < 1 4

- Bromofluorobenzene {surr) 102 % R 102 %R 103 % R Toluene-d8 {surr) 101 % R 100 %R 100 % R



## easte rn analytical, inc. www

. eailabs

. com Phone: (603) 228

- 0525 

## 2

# I A AO;l

. ____ o_c_R_E_P_o_RT

________ _ Eastern Analytical, I nc

. 10#: 89366
Client: S anb o rn , H e ad 

### & As so c i ates , Inc

. Client Designation: LT G 

### 12049

. 02

Para m et e r N a m e Bla nk LCS L CSD A n a lysis Date Units Li m its RPD Me t hod

1 ,4-Dioxane < 

### 1 5 (95 %R) 4 (79 %R) (18 RPD) 5/26/2010 ug/1 

### 70- 130 20 82608 4-8romofluorobenzene (surr) 103 %R 1 03 %R 1 02 % R 5/26/2010 % Rec 70

- 130 50 82608 Toluene-dB (surr) 101 %R 1 00 %R 101 % R 5/26/2010 % Rec 70- 130 50 82608

Samples were extracted and analyzed within holding time lim i ts

. Instrumentat i on was cal i brated in accordance with the method requirements

. The method blanks were free of contamination at the reporting l im i ts. Sample surrogate recoveries met t he above stated criteria. The associated matr i x spikes and / or Labora t ory Control Samples met acceptance criter i a

. There were no exceptions in the analyses, unless noted. * 

### F l agged analyte recoveries deviated from the QNQC 

### limits

.



## eastern ana l ytica l , inc. www

. eailabs. com 

### Phone: (603) 228

- 0525 

## 3

# LAB ORA TORY REPORT

Eastern Analytical, Inc. ID#: 

## 89366 Cl ient: Sanborn, Head & 

### Associates , Inc. C li ent Designation: LTG 1 

### 2049.02 (NH) Samp l e ID: SW-2 I 05-19

- 10 SW-1 I 05- 1 9-10 D u p -1 I 05

- 19-10

L ab Samp l e I D : 89366.0 4 89366

. 05 89366.06 M a trix: aqu eo u s aqueous aqueous Date S a mpl e d: 51 1 9110 51191 1 0 5119110 D a t e Received : 5120110 51201 1 0 5120110
Solids Sus p ended 49 41 

### 250



## eastern analytical, inc. www. eailabs

. com Analys i s Un i t s D a t e Tim e Me th od An a l y st mgi L 51251 1 0 8 : 11 25 4 00 JCC

Phone: (6 0 3) 228

- 0525 

## 4

# QC REPORT

Eastern Analytical , Inc

. ID# : 

## 89366
Client: Sa nborn , Head 

### & Associates, Inc

. Client Designation: 

### l TG 1 

### 2 049

. 02

D at e of 

### P a ram et e r Nam e Blan k 

### L CS L CSD Units A n a l ys i s Limi ts RPD Method

Solids Suspended <5 100 (100 % R) 94 (94 %R) (6 RPD) mg/L 5/25/ 10 90

- 110 20

Samples were analyzed within holding times unless noted on lhe samp l e results page. I nstrumentation was calibrated in accordance with t he method requirements

. The method blanks were free of contamination a t the reporting limits. The associated matrix spikes and/or Labora t ory Con t ro l Samp l es met the above stated criter i a. Excep t ions to the above statements are f l agged o r noted above or o n the QC Narrative page. • F lagged a n alyle recoveries devia t ed from t he QAJQC limi t s.



## eastern analytical, inc. www.eailabs.com Phone: (603) 228-0525 25400



## 5

# LAB ORA TORY REPORT

Eastern A n a l yt i ca l , In c

. 10 # : 

## 89366 Client: Sanborn , Head & Associates , Inc. (N H ) Client Designation : LTG 1 

### 2049.02

Sample 10: MW-2R I 05-19-10 Dup-2/ 05-19-10

Lab Sample 10: 89366 .0 1 89366.02 Matrix: aqueous aqueous Date Sampled: 5/19/10 5/19/10 Analytical Date of Date Received: 5/20/10 5/ 20/10 Matrix Units Analysis Method Analyst

Arsenic < 0 .001 < 0 .00 1 AqTot mg/L 5/21/10 6020 OS

Sample ID : SW-2/ 05-19-10 SW- 1 / Oup-1 

### I 05-19-10 05-19-10

Lab Sample 10: 89366.04 89366

. 05 89366

. 06 Matrix : aqueous aqueou s aqueous Date Sampled: 5/19/10 5/ 1 9/ 10 5/ 1 9/ 10 Analytical Date of Date Received: 5/20/10 5/20/10 5/20/10 Matrix Units Analysis Method Analyst

Aluminum 0.05 < 0.05 < 0.05 AqTot mg/L 5/21/10 6020 OS Aluminum < 0

. 05 < 0.05 <0

. 05 AqOis mg/L 5/21/10 6020 OS Iron 12 0.16 0.23 AqTot mg/L 5/21/10 6020 OS Iron 8.9 < 0.05 < 0.05 AqOis mg/L 5/21/10 6020 OS Lead < 0.0005 < 0

. 0005 < 0

. 0005 AqTot mg/L 5/21/10 6020 OS Lead < 0 .0005 < 0

. 0005 < 0

. 0005 AqOis mg/L 5/2 1 /10 6020 OS Nickel 0

. 008 0.001 0

. 001 AqTot mg/L 5/21110 6020 OS Nickel 0.008 0.001 0

. 001 AqOis mg/L 5/21/10 6020 OS Zinc 0.012 0

. 009 < 0

. 005 AqTot mg/L 5/2 1 /10 6020 OS Z in c 0.010 < 0

. 005 < 0

. 005 AqOis mg/L 5/21/10 6020 OS Total Hardness (as CaC03) 130 48 46 AqTot mg/L 5/21/10 6020 OS



## eastern ana l ytica l , i nc

. www.eailabs

. com Phone: (60 3 ) 228

- 0525 

## 6

# QC REPORT

E aste rn Anal yt i ca l , In c. 10#: 

## 89366 Client: Sanborn, Head 

### & Associates, Inc. (NH) 

### Clien t Designation : 

### LTG 

## I 2049.02

Date of Parameter Name Blank LCS LCSD Units Ana l ysis Limits

Aluminum < 0

. 05 12(108 % R) mg / L 5/21 / 10 80- 120 Arsenic < 0

. 00 1 1.0(102%R) mg/L 5/2 1 /10 80- 120 Iron < 0.05 11 (99 % R) mg/L 5/2 1 110 80

- 120 L ead < 0

. 0005 1

. 0 ( 100 % R) mg/L 5/2 1 /10 80- 120 Nick el 0

. 00 1 0.9 4 (9 4 %R) mg/L 5/2 1 /10 80- 120 Zinc < 0.005 0.89 (89 %R) mg/L 5/21/ 1 0 80- 1 20

MS / MSO MS / MSD Date of Parameter Name Parent 10 Parent Matrix Spike M SO Units Ana l ysis Lim its



# - ---- Aluminum 89317.02 < 0

. 05 12 ( 112 % R) 12 ( 111 % R ) (1 RPO) Arsenic 89317.02 0

. 013 1

. 1 (107 % R) 1

. 1 ( 106 % R) (1 RPD) I ron 89317.02 1

. 3 12 (98 % R) 12 (98 % R) (0 RPD) Lead 89317.02 < 0.0005 0

. 9 4 {9 4 % R) 0

. 95 (95 % R) (1 RPD) N ic ke l 89317

. 02 0

. 001 1 .1(105%R) 0

. 98 (98 % R) (7 RPD) Zinc 89317.02 < 0.00 5 1.0 (99 %R) 0

. 97 (97 % R) (2 RPD)

Samples were analyzed within holding times un l ess noted on the sample results page

. Instrumentat i on was calibra t ed i n accordance with the method r equi r ements. The method blanks were free of contamination at the reporting limits

. The associated matrix spikes and/o r Laboratory Control Samples met th e above stated criteria

. Exceptions to th e above sta t ements are flagged or noted above or on the QC Narrative page

. • Flagged ana lyt e r ecoveries deviated from the QA/QC limits

. mg/L 5 / 21/10 75

- 125 mg/L 5/21/10 75-125 mg/L 5/21/10 75-125 mg/L 5/21/10 75-125 mg/L 5/21/10 75-125 mg /L 5/21/10 75

- 125 RPO

20 20 20 20 20 20

RPO

20 20 20 20 20 20



## eastern analytical, inc. www .e ailabs .c om Phone: (603) 228 -0525 Method

6020 6020 6020 6020 6020 6020

Method

6020 6020 6020 6020 6020 6020



## 7Page / of / CHAIN-OF-CUSTODY RECORD
BoLD FtELDS REQUiRED. PLEASE CiRCLE REQUESTED ANALYSIS. 

# E 89366 

# J

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## analytical

.' inC. 25 CHENELL DRIVE l CONCORD, NH 03301 1 TEL : 603.228.0525 1 1.800.287.05251 fAX: 603.228.459" E- M AIL: CUSTOMER _SE R.VICE@EAILABS

. COMI WWW.EAILABS.cm1 pmfisJwluJ!**!t~bomtm,v** smm't"s (WHITE: ORIGINAL GREEN: PROJECT MANAGER) 

# -

### Town Garage/Radio Beacon Site / Attachment E 2049.02 \ ATT_E-DQA.docx August 25, 2010 Page 1 

# A DDITIONAL 

# G ROUNDWATER AND 

# S URFACE WATER MONITORING 

## DATA QUALITY/DATA USABILITY ASSESSMENT SHA performed an assessment of data quality and usability as described in SHA’s December 2009 Quality Assurance Project Plan 1 

## (QAPP; refer to attached tables).



# x A review of field equipment calibration/calibration check data sheets indicated field instruments calibrated correctly and maintained calibration throughout the day.



# x A review of field documentati on indicated field Standard Op erating Procedures (SOPs) were followed appropriately.



# x A review of the analytical data packages pr ovided by the laboratory indicated they were complete and laboratory Quality Control (QC) met applicable criteria, the trip blank was clean, and applicable reporting limits were met.



# x A review of the field duplicate pair (S W-1/05-19-10 and Dup-1/ 05-19-10) indicated a relative percent difference (RPD) of greater than 30 percent for total suspended solids and iron for the unfiltered aliquot indicating sample non-homogeneity. This is probably the result of light rain that day, along with a water column only 0.30 feet thick. The results for the primary and duplicate samples for total suspended solids and unfiltered iron should be considered estimated. Based on the data quality/data usability assessment, the data are of sufficient quality for their intended purpose (i.e., comparis on to applicable groundwater 2 

## and surface water standards 3 

## ), with the limitations noted above.

S:\CONDATA\2000s\2049.02\originals\2010 Annual Report\ATT-E\ATT_E-DQA.docx

1 

### SHA, 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.

2 

### The applicable groundwater standards for the site are the New Hampshire Department of Hampshire Environmental Services (NHDES) Ambient Groundwater Quality Standards (AGQS; which are based on federal Maximum Contaminant Levels [MCLs]) and the NHDES Contaminated Sites Risk Characterization and Management Policy (RCMP) GW-1 Groundwater Standards.

3 

### The applicable surface water standards are the Water Quality Criteria (WQC) as defined in NHDES Env-Wq 1703.21.

### Review of Analytical Reporting Limits, Trip Blank, and Duplicate % RPD – Groundwater Town Garage/Radio Beacon Site Londonderry, New Hampshire

NHDES Site No. 198509001

S:\CONDATA\2000s\2049.02\originals\2010 Annual Report\ATT-E\Att E-DQA Tables.xlsx Page 1 of 1 Sanborn, Head & Associates, Inc. 

### Concentrations in μ g/l. TB-2 / 05-19-10 MW-2R 05/19/10 05/19/10 05/19/10 Dup. Duplicate % RPD Dioxane (1,4-) 3 † <1 <1 <1 – Arsenic 10 NA <1 <1 – GW-2 Analyte GW-1 (AGQS)

Notes: 1. Samples were collected by SHA on the date indicated and analyzed by Eastern Analytical, Inc. of Concord, New Hampshire for 1,4-dioxane United States Environmental Protection Agency (USEPA) Method 8260B in selective ion monitoring (SIM) mode, and unfiltered arsenic by USEPA Method 6020A. 2. Concentrations are presented in micrograms per liter ( μ g/l) which are equivalent to parts per billion (ppb). 3. "<" 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 Sites Risk Characterization and Management Policy (RCMP) (January 1998, with 2000 through 2007 revisions/addenda). GW-1 Groundwater Standards are equivalent to the Ambient Groundwater Quality Standards (AGQSs) promulgated in Env-Or 600 (July 2008). 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. 5. "†" indicates the RCMP lists as not currently available. "NA" indicates the RCMP lists as not applicable. 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 SHA's December 2009 Quality Assurance Project Plan for further details on data quality and data usability.

### Review of Analytical Reporting Limits and Duplicate % RPD – Surface Water Town Garage/Radio Beacon Site Londonderry, New Hampshire

NHDES Site No. 198509001

S:\CONDATA\2000s\2049.02\originals\2010 Annual Report\ATT-E\Att E-DQA Tables.xlsx Page 1 of 1 Sanborn, Head & Associates, Inc. 

### Concentrations in μ g/l

SW-1 (Wetland Surface Water) SW-2 (Hillslope Ponded Drainage Water) Thornton Road Reference
Acute Chronic 5/19/2010 05/19/10 Dup. Duplicate % RPD 5/19/2010 5/19/2010 Unfiltered Aluminum 750 87 <50 <50 – 

### 50 50 Iron NS 1,000 

### 160 230 36% 12,000 70 Lead 14 † 0.54 † <0.5 <0.5 – <0.5 <0.5 Nickel 144.9 † 16.1 † 

### 1 1 0% 

### 8 <1

Zinc 36.2 † 36.5 † 

### 9 <5 – 

### 12 <5 Total Hardness (as CaCO 3 

### ) 

### 48,000 46,000 4% 130,000 26,000

Total Suspended Solids 

### 41,000 250,000 144% 49,000 18,000 Filtered Aluminum 750 87 <50 <50 – <50 <50 Iron NS 1,000 <50 <50 – 

### 8,900 <50 Lead 14 † 0.54 † <0.5 <0.5 – <0.5 <0.5 Nickel 144.9 † 16.1 † 

### 1 1 0% 

### 8 1

Zinc 36.2 † 36.5 † <5 <5 – 

### 10 8 Analyte Water Quality Criteria for Fresh Water

Aquatic Life

Notes: 1. Samples collected on in 2010 were collected by SHA personnel and submitted to Eastern Analytical, Inc. of Concord, New Hampshire for analysis of filtered and unfiltered metals by USEPA Method 6020A, total hardness as CaCO3 by USEPA Method 6020A and Standard Method 2340B, and total suspended solids by Standard Method 2540D. 2. Results are presented in micrograms per liter ( μ g/l) which are equivalent to parts per billion (ppb). "<" indicates the analyte was not detected above the listed laboratory reporting limit. 3. "Water Quality Criteria" refers to the New Hampshire Water Quality Criteria for Toxic Substances as defined in Env-Wq 1703.21 (May 2008). "Acute" refers to the acute criteria for the protection of aquatic life in fresh water. "Chronic" refers to the chronic criteria for the protection of aquatic life in fresh water. "†" Refer to Env-Wq 1703.21 for additional notes for these criteria.
4. No detected concentrations exceed the Water Quality Criteria. 5. Duplicate % RPD indicates the relative percent difference as calculated by the following formula: | Result1 - Result2 | / ((Result1 + Result2) / 2) * 100
6. "–" indicates the RPD can not be calculated because one or both of the results are non-detect. Shaded values have RPDs greater than 30%. 7. Refer to SHA's December 2009 Quality Assurance Project Plan for further details on data quality and data usability.