# 2007 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 2049.01 January 2008

## January 23, 2008 File No. 2049.01 Sherilyn B. Young, Esq. Rath, Young and Pignatelli, P.A. P.O. Box 1500 Concord, NH 03302-1500 Re: 2007 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) has completed the year 2007 groundwater quality monitoring round at the Town Garage/Radio Beacon Site (Site). This work has been completed in accordance with the Unilateral Administrative Order (UAO) issued to the Town in September 1996 by the United States Environmental Protection Agency (USEPA); a Statement of Work (SOW) that defines the scope of groundwater quality monitoring to be completed at the Site was included in the UAO. Further, the monitoring program has been carried out under the auspices of 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. Based on observed water quality conditions at Site wells, and in accordance with the periodic review and modification provision in the SOW, Revised Amendment No. 2 to the SOW, dated June 2, 2006 (approved by USEPA on June 12, 2006) was prepared to remove select monitoring and residential water supply wells from the GMP sampling program, decommission six additional monitoring wells and install one replacement monitoring well. Replacement monitoring well MW-2R was installed October 30, 2006 as a replacement to monitoring well MW-2D-6. The well installation was summarized in the Site’s 2006 Annual Summary Report dated January 31, 2006. From October 9 to 12, 2007 two shallow overburden monitoring wells (MW-2S and MW-5S), and four bedrock monitoring wells (MW-2D, MW-3D, MW-4D, MW-8D) were decommissioned at the Site in accordance with amended SOW, by Geosearch, Inc. (Geosearch) of Fitchburg, Massachusetts. The work performed by Geosearch was observed and documented by SHA. Documentation of well decommissioning activities is included in Attachment A. Shallow bedrock well MW-2R is the only well remaining in the Groundwater Monitoring Program.Town of Londonderry 2049.01 \ 2007 Annual Rpt.doc January 23, 2008 Page 2 

## GROUNDWATER SAMPLING AND ANALYSIS One groundwater sample was collected from monitoring well MW-2R on November 9, 2007. Prior to purging/sampling monitoring well MW-2R, the groundwater level in the well was measured with an electric water level meter. Historical water level data are summarized in Table 1. 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 November 1996 “Groundwater Sampling and Quality Assurance Plan, Town Garage/Radio Beacon Site, Londonderry, New Hampshire.” Water quality parameters including temperature, pH, specific conductance, and dissolved oxygen were monitored during purging using an YSI Model 556 MPS multi-parameter water quality meter with an in-line flow cell. Upon parameter stabilization, the in-line flow cell was disconnected and a groundwater sample collected. A summary of stabilized water quality parameter data for the November 2007 round is presented on the Groundwater Quality Field Sampling Summary form included in Attachment B. Historical water quality parameter data are summarized in Table 1. 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 coolers packed with ice and delivered to Eastern Analytical, Inc. (EAI) of Concord, New Hampshire, a New Hampshire certified laboratory, for volatile organic compound (VOC) analysis by USEPA Method 8260B using the NHDES Petroleum and Hazardous Waste Remediation Full List of Analytes(NHDES Full List). Samples were handled and transported following standard chain-ofcustody procedures. A trip blank, prepared beforehand by EAI, was also analyzed for VOCs by USEPA Method 8260B. Copies of EAI’s analytical laboratory data reports for these monitoring rounds are included in Attachment C.
SUMMARY OF ANALYTICAL RESULTS The November 2007 groundwater quality monitoring results for monitoring well MW-2R indicate similar compounds as those previously observed at monitoring well MW-2D-6. Specifically, 1,1-dichloroethane (1,1-DCA), 1,1-dichloroethene (1,1-DCE), and 1,1,1- trichloroethane (1,1,1-TCA) were the only VOCs detected in the sample from MW-2R. There was only one exceedance of groundwater cleanup levels, namely 1,1-DCE at a concentration of 14 μ g/l. The concentrations of these VOCs observed for the November 2007 round are lower than the results for the two 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 this monitoring location. The water quality analytical database for Site monitoring wells is presented in Table 2. A concentration versus time plot for VOCs for MW-2D-6 and MW-2R is presented as Figure 2. Constituent-specific cleanup levels established for the Site are indicated on the concentration versus time plot.

# Sanborn, Head and Associates, Inc. Digitally signed by Sanborn, Head and Associates, Inc. DN: cn=Sanborn, Head and Associates, Inc., o=Sanborn, Head and Associates, Inc., ou, email=lsmith@sanbornhead. com, c=US Date: 2008.01.24 14:30:35 -05'00'

# TABLES

### TABLE 1 Summary of Elevations and Field Screening - Monitoring Wells & Residential Wells Town Garage / Radio Beacon Site

Londonderry, New Hampshire

Sampling Location Sampling Date Ground Surface Elevation (Feet MSL) Reference Point Elevation (Feet MSL) Groundwater Elevation (Feet MSL) Temperature (°C) Specific Conductance ( ȝs/cm) Dissolved Oxygen (mg/l) pH (Standard

Units) Monitoring Wells 11/26/96 357.60 9.0 2,910 8.3 6.7 11/20/97 354.27 11.7 4,160 6.5 5.8 01/01/98 11/22/99 351.45 12.2 1,080 3.3 6.1 12/06/00 352.00** 9.0** 1,500** 7.8** 5.8** 11/19/01 348.72 13.1 2,870 7.7 5.8 11/15/02 352.09 13.1 775 3.7 6.0 11/04/03 352.20 13.0 560 9.8 6.1 11/03/04 349.84 13.8 1,200 3.8 5.6 11/28/05 352.51 10.3 1,350 4.9 5.5 11/27/96 337.65 6.8 7,700 5.7 6.7 11/20/97 336.20 7.9 5,750 1.5 6.3 11/10/98 335.44 8.4 7,590 5.3 6.3 11/23/99 335.54 11.7 6,620 1.2 6.5 11/21/00 335.93 9.3 6,900 7.8 6.5 11/19/01 333.81 10.7 6,730 0.0 6.4 11/15/02 334 69 11 4 6 380 0 1 6 4 †† 201.77 359.29 361.79 Monitoring Well Destroyed

356.35 356.04 MW-2S

MW-2D-2 11/15/02 334

. 69 11

. 4 6 , 380 0

. 1 6

. 4 11/04/03 335.83 9.7 7,130 0.0 6.9 11/04/04 334.50 10.5 7,220 0.6 6.5 11/28/05 336.11 10.3 7,260 0.2 6.4 11/27/96 351.95 6.9 29,100 2.9 6.9 11/20/97 345.42 8.2 29,600 3.0 6.5 11/10/98 347.87 8.9 37,600 8.4 6.7 11/23/99 344.87 12.5 26,200 0.7 6.7 11/21/00 349.08 10.4 23,600 2.2 6.8 11/19/01 343.97 11.6 22,500 0.0 6.7 11/15/02 348.10 13.3 16,500 0.0 6.7 11/04/03 348.76 10.2 15,800 0.1 7.2 11/04/04 346.78 11.5 15,100 0.7 7.0 11/29/05 349.23 12.3 13,900 0.2 7.0 11/13/06 351.99 12.5 13,700 0.5 7.0 12/11/06 351.56 8.8 14,700 0.8 6.9 11/09/07 352.07 12.9 12,500 0.3 6.8 11/26/96 334.69 6.9 12,900 0.2 6.9 11/20/97 333.65 8.9 12,200 1.9 7.3 11/09/98 333.33 8.5 11,800 0.2 7.6 11/22/99 334.17 10.1 9,790 0.6 7.6 11/17/00 334.47 9.9 9,000 0.5 7.5 11/19/01 333.00 10.1 8,550 0.3 7.4 11/14/02 333.79 10.0 8,940 

## † 7.5 11/05/03 334.44 9.1 8,300 0.3 7.5 11/03/04 333.98 9.7 7,930 0.3 7.3 11/28/05 335.08 8.7 7,480 0.6 7.2 †† 315.77

339.72 341.54 355.99 355.69 MW-2D-6

MW-3D MW-2R Installed 10/30/06

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### TABLE 1 Summary of Elevations and Field Screening - Monitoring Wells & Residential Wells Town Garage / Radio Beacon Site

Londonderry, New Hampshire

Sampling Location Sampling Date Ground Surface Elevation (Feet MSL) Reference Point Elevation (Feet MSL) Groundwater Elevation (Feet MSL) Temperature (°C) Specific Conductance ( ȝs/cm) Dissolved Oxygen (mg/l) pH (Standard

Units) 11/25/96 345.71 6.4 58,600 2.6 7.0 11/20/97 343.06 6.1 40,500 2.3 5.9 11/10/98 344.44 7.9 35,400 0.0 6.7 11/23/99 344.66 12.5 31,400 1.1 6.3 11/21/00 345.81 7.4 28,200 4.1 6.7 11/20/01 344.16 8.0 28,100 0.8 6.4 11/15/02 344.06 11.9 23,700 0.0 6.9 11/04/03 346.72 6.2 23,600 0.7 6.7 11/04/04 344.19 8.6 21,100 0.7 6.5 11/29/05 347.79 10.6 19,900 0.7 6.4 11/25/96 372.18 7.5 3,400 2.5 7.0 11/20/97 370.26 7.2 19,400 2.1 6.7 11/10/98 370.26 7.1 19,000 0.3 7.2 11/23/99 370.83 11.8 14,570 0.6 7.3 11/21/00 371.18 8.1 12,900 3.3 7.3 11/20/01 368.40 9.0 11,900 0.9 7.2 11/15/02 369.64 10.9 11,000 0.1 7.2 11/04/03 368 67 8 2 11 500 0 3 7 7 384.24 343.24 309.74 384.24

MW-4D-3 MW-4D-2

11/04/03 368

. 67 8

. 2 11 , 500 0

. 3 7

. 7 11/04/04 369.30 9.3 11,300 0.7 7.3 11/29/05 371.63 9.9 11,400 0.2 7.3 11/25/96 373.06 7.9 19,100 2.2 7.0 11/20/97 370.26 9.4 12,000 4.9 5.2 11/10/98 370.44 9.1 18,900 1.4 5.9 11/23/99 372.22 13.6 16,500 0.6 6.0 12/06/00 372.67** 9.5** 11,000** 1.3** 5.9** 11/20/01 369.69 9.7 16,100 0.1 6.0 11/15/02 370.15 11.6 14,300 0.4 5.9 11/04/03 372.57 10.1 12,000 1.3 6.2 11/04/04 371.66 9.4 14,400 0.8 6.2 11/29/05 373.90 11.0 13,500 0.6 6.2 11/25/96 376.86 6.9 17,700 3.8 7.0 11/20/97 373.36 8.1 14,100 2.2 5.9 11/10/98 372.88 7.9 18,500 1.2 6.6 11/23/99 373.66 12.6 15,370 2.3 6.5 11/21/00 374.24 8.6 15,200 5.0 6.5 11/26/96 333.00 7.9 20,700 2.9 7.0 11/20/97 * 7.7 20,200 2.6 6.3 11/09/98 * 8.1 19,100 2.9 7.3 11/22/99 331.39 10.0 15,210 0.4 7.2 11/17/00 331.64 9.3 12,600 0.6 7.4 11/19/01 330.36 9.4 12,000 0.8 7.2 11/14/02 330.79 10.1 13,000 

## † 7.3 11/05/03 331.54 8.5 11,200 1.0 7.4 11/03/04 330.31 9.5 10,400 0.4 7.4 11/28/05 331.66 9.1 8,640 0.0 7.3 MW-6D-2 338.35 241.28

MW-5S 383.00 385.00

MW-5D-4 382.63 327.53

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### TABLE 1 Summary of Elevations and Field Screening - Monitoring Wells & Residential Wells Town Garage / Radio Beacon Site

Londonderry, New Hampshire

Sampling Location Sampling Date Ground Surface Elevation (Feet MSL) Reference Point Elevation (Feet MSL) Groundwater Elevation (Feet MSL) Temperature (°C) Specific Conductance ( ȝs/cm) Dissolved Oxygen (mg/l) pH (Standard

Units) 11/26/96 * 7.8 11,000 2.9 6.9 11/20/97 * 8.1 19,100 2.0 6.8 11/09/98 * 7.8 19,800 0.5 7.1 11/22/99 * 11.6 11,780 0.4 7.2 11/17/00 * 10.0 11,300 0.4 7.3 11/19/01 * 10.1 13,200 0.0 7.1 11/14/02 * 10.3 12,300 

## † 7.2 11/05/03 * 7.6 7,300 0.3 7.5 11/03/04 * 9.9 7,080 0.1 7.2 11/28/05 * 9.0 3,530 0.3 7.3 11/27/96 339.69 9.7 24,400 6.5 7.0 11/20/97 336.95 10.8 19,700 0.1 7.3 11/09/98 337.35 12.0 16,200 0.0 7.5 11/22/99 338.23 13.1 14,930 0.6 7.4 11/17/00 339.08 12.9 11,800 0.3 7.1 11/19/01 336.46 11.8 10,800 0.0 7.5 11/14/02 338.53 11.0 9,790 0.1 7.3 11/04/03 339 45 11 5 8 400 0 4 7 5 MW-8D 357.16 359.15 MW-6D-4 338.35 309.28

11/04/03 339

. 45 11

. 5 8 , 400 0

. 4 7

. 5 11/03/04 338.28 11.5 8,650 0.2 7.5 11/28/05 339.45 11.6 8,000 1.5 8.2 Residential Wells 11/20/97 - - - 2.4 2,930 + 6.3 11/18/99 - - - 7.9 1,033 + 6.6 11/20/97 - - - 10.7 950 + 7.5 11/27/99 - - - 11 1,240 + 7.5 MW-16D 11/18/99 - - - 6.9 533 + 6.9 11/20/97 - - - 4.1 1,680 + 6.3 11/18/99 - - - 6.8 1,944 + 6.6 11/20/97 - - - 3.3 2,510 + 6.0 11/18/99 - - - 6.8 8,980 + 6.5 11/16/01 - - - 17.2 3,310 + 6.3 11/04/03 - - - 8.5 980 + 6.6 11/28/05 - - - 10.5 340 + 6.6 11/20/97 - - - 3.4 500 + 6.4 11/18/99 - - - 6.2 446 + 7.3 11/16/01 - - - 17.4 420 + 7.0 11/04/03 - - - 8.9 430 + 7.4 11/28/05 - - - 10.6 490 + 7.5 11/20/97 - - - 3.3 550 + 6.5 11/22/99 - - - 14.5 545 + 6.9 11/20/97 - - - 1.9 590 + 6.4 11/18/99 - - - 8.2 660 + 6.7 11/20/01 - - - 8.3 860 + 6.2 11/04/03 - - - 9.5 960 + 7.2 11/28/05 - - - 12.1 560 + 6.8 MW-23D MW-14D

MW-15D

MW-18D

MW-22D MW-19D

MW-20D

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### TABLE 1 Summary of Elevations and Field Screening - Monitoring Wells & Residential Wells Town Garage / Radio Beacon Site

Londonderry, New Hampshire

Notes:
1. Groundwater leve ls and water quality field screening parameters were measured by SHA on the dates indicated. 2. Groundwater level measurements in overburden and bedrock monitoring wells were obtained with either a Slope Indicator Company or a QED Environmental Systems electric water level meter. Groundwater level measurements in multi-level monitoring wells were obtained using previously-installed Geokon, Inc. vibrating wire pressure transducers and a Geokon, Inc. GK-401 readout box. 3. Water quality parameters obtained for monitoring wells in November 1996, 1997, and 1998 were measured in an in-line flow cell using an O.I. Analytical Aqua-CheckTM Water Analyzer; in November 1999 were measured in an in-line flow cell using an Orion Model 830 dissolved oxygen meter, an Orion Model 130 conductivity meter, and an Orion Model 260 pH meter; and in November/December 2000, November 2001, November 2002 (pH, temperature, and specific conductance), November 2003, and November 2004 were measured using a YSI Model 600XLM multi-parameter water quality meter with in-line flow cell; and, in November 2005, November and December 2006, and November 2007 were measured using a YSI Model 556MPS multi-parameter water quality meter with in-line flow cell. In November 2002 dissolved oxygen was measured using a YSI 85 dissolved oxygen meter, located within a separate flow cell; the flow cell containing the dissolved oxygen probe was connected in series and upstream of the flow cell containing the pH, specific conductance, and temperature probes, as described in U.S. Environmental Protection Agency Region I, Low Stress (low flow) Purging and Sampling Procedure for the Collection of Ground Water Samples from Monitoring Wells, July 30, 1996, Revision 2. 4. Water quality parameters obtained for residential wells in November 1997 were measured using an Extech Oyster pH/conductivity probe, in November 1999 and 2001 using a Cole Parmer pH/Con Series 10 meter, and in November 2003 and 2005 using a Hanna HI 991301 portable pH/EC/TDS/Temperature meter. 5. Groundwater level measurements were referenced to the top of steel casing elevation for the overburden and bedrock monitoring wells and to the pressure transducer elevation in multi-level monitoring wells. Groundwater level measurements in MW-2 R were referenced to top of PVC. Elevations are presented in feet above mean sea level (MSL). 6. Parameters reported for monitoring wells represent values obtained after parameter measurements stabilized; and for residential wells, represent values obtained after allowing the water to run for approximately 15 minutes to purge stagnant water from the piping system. 7. "*" indicates that the pressure transducers installed in MW-6D-2 and MW-6D-4 were not operational at the time of measurement. "†" indicates that the dissolved oxygen probe was not operational at the time of measurement. "††" indicates that ground surface elevation in the vicinity of monitoring well MW-2D was altered during construction of the Saddleback residential neighborhood in 1997/1998. "**" indicates measurement from December 6, 2000 when well was resampled because the initial sample collected on November 16, 2000 was analyzed by the laboratory past its holding time. "-" indicates that water level was not measured in the residential wells. "+" indicates that dissolved oxygen was not measured in groundwater from these wells. 8. The ground surface and reference elevations indicated for MW-2S are for the replacement well installed on November 18, 1999 by Capital Environmental Drilling, Inc. of Dunbarton, New Hampshire. Prior to the installation of the replacement well, the ground surface and reference elevations for MW-2S were 359.29 feet and 361.79 feet, respectively. 9. Prior to the 2001 sampling round, Amendment No. 1 to the Statement of Work (SOW) was approved by USEPA allowing sampling locations MW-5D-4, MW-12D, MW-14D, MW-15D, MW-16D, MW-18D, and MW-22D to be dropped from the groundwater monitoring program.10. Prior to the 2006 sampling round, Revised Amendment No. 2 to the SOW was approved by USEPA allowing sampling locations MW2S, MW-2D-2, MW-2D-6, MW-3D, MW-4D-2, MW-4D-3, MW-5S, MW-6D-2, MW-6D-4, MW-8D, MW-19D, MW-20D, and MW23D to be dropped from the groundwater monitoring program. 11. Monitoring well MW-2R was installed on October 30, 2006 as a replacement to monitoring well MW-2D-6.

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### TABLE 2 Summary of VOCs and Chloride Analytical Data - Monitoring Wells Town Garage / Radio Beacon Site

Londonderry, New Hampshire Monitoring Well Location Chloride (mg/l) 1,1-DCA ( μ g/l) 1,1-DCE ( μ g/l) 1,1,1-TCA (μ g/l) Other VOCs ( μ g/l) Cleanup Levels 250 mg/l 81 μ g/l 7 μ g/l 200 μ g/l Nov-90 440 BDL BDL BDL 05/09/94 257 BDL BDL BDL 2.20 - THM 11/03/94 NS BDL BDL BDL 4.20 - THM 04/26/95 192 BDL BDL BDL 2.5 - THM 11/01/90 NS BDL BDL BDL 05/09/94 833 BDL BDL BDL 12/06/94 797 BDL BDL BDL 04/26/95 810 BDL BDL BDL Nov-90 3,410 74 18 790 05/11/94 1,682 59 15 200 11/03/94 1,170 150 29 450 04/21/95 1,211 78 25 200 10/12/95 2,440 150 31 410 14 - MTBE 05/02/96 760 30 6.7 79 11/26/96 NS 23 4 59 11/20/97 NS 33 8 81 Replacement Well installed 11/18/99 

### 11/22/99 NS BDL BDL 4 12/06/00 NS 4 1 9 11/19/01 NS 6 2 12 8 THM

Date

MW-1S

MW-1D

MW-2S

11/19/01 NS 6 2 12 8 - THM 11/15/02 NS BDL BDL BDL 11/04/03 NS BDL BDL BDL 5 - THM 11/03/04 NS BDL BDL BDL 11/28/05 NS BDL BDL BDL MW-2D* Nov-90 3,960 46 41 BDL 04/20/95 5,749 100 9.1 7.3 180 - MTBE 24 - Toluene

10/13/95 4,090 31 5.2 6.3 110 - MEK 4.8 - THM 6.1 - Toluene 2.2 - Carbon disulfide

05/01/96 4,100 69 12 5.3 3.5 - Carbon disulfide 3.3 - THM 130 - MEK 10 - Toluene 5.6 - Chloroethane 12/06/94 5,420 46 4.5 6.9 12 - Toluene 390 - MEK 04/20/95 5,484 140 13 BDL 72 - Toluene 10/13/95 4,270 160 17 BDL 75 - Toluene 6.7 - Dimethyl sulfide
05/01/96 2,800 87 19 BDL 64 - Acetone 8.4 - Carbon disulfide 120 - Toluene 11/27/96 NS 20 BDL BDL 180 - Toluene 600 - MEK MW-2D-1

MW-2D-2

MW-2S

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### TABLE 2 Summary of VOCs and Chloride Analytical Data - Monitoring Wells Town Garage / Radio Beacon Site

Londonderry, New Hampshire Monitoring Well Location Chloride (mg/l) 1,1-DCA ( μ g/l) 1,1-DCE ( μ g/l) 1,1,1-TCA (μ g/l) Other VOCs ( μ g/l) Cleanup Levels 250 mg/l 81 μ g/l 7 μ g/l 200 μ g/l Date

11/20/97 NS 12 9 BDL 82 - Toluene 220 - MEK 10 - 2-Hexanone 11/10/98 NS 9 8 BDL 67 - Toluene 60 - MEK 11/23/99 NS 5 4 BDL 14 - Toluene 10 - MEK

11/21/00 NS 6 4 BDL 10 - Acetone 30 - MEK 11 - Toluene

11/19/01 NS 6 4 BDL 20 - Acetone 20 - MEK 14 - Toluene

11/15/02 NS 4 3 BDL 20 - Acetone 10 - MEK 13 - Toluene 11/04/03 NS 4 3 BDL 10 - Acetone 9 - Toluene 11/04/04 N S 6 3 BDL 20 - Acetone 11 T l MW-2D-2

(cont.)

11 - T o luene 11/28/05 NS 6 3 BDL 20 - Acetone 13 - Toluene 12/06/94 2,339 7 6.2 2.6 1.20 - Toluene 04/20/95 2,458 6.5 5.1 1.7 1.20 - Toluene 10/13/95 2,410 6.6 5.5 1.7 1.5 - MTBE 05/01/96 2,400 7.8 9.2 BDL 3.3 - MTBE 06/03/94 NS BDL BDL 7.6 12/06/94 7,390 11 8 6.4 04/20/95 7,979 12 8 5.5 10/12/95 8,810 14 9.9 5.7 2 - MTBE 05/01/96 8,700 22 20 9.9 2.8 - MTBE 06/03/94 36,000 33 17 34 12/06/94 18,980 19 15 23 04/20/95 17,940 34 20 27 10/12/95 17,400 37 25 20 2.4 - MTBE 05/01/96 18,800 50 44 30 2.1 - Chloroethane 06/03/94 10,900 100 37 300 12/06/94 12,410 100 48 360 04/20/95 11,530 120 58 280 10/12/95 9,000 120 62 320 05/01/96 11,300 150 86 360 6.9 - Chloroethane 11/27/96 NS 110 50 240 11/20/97 NS 100 64 160 1 - Toluene
11/10/98 NS 110 58 150 1 - Toluene 7 - Chloroethane 11/23/99 NS 86 40 85 8 - Chloroethane 11/21/00 NS 120 48 56 13 - Chloroethane MW-2D-6 MW-2D-3

MW-2D-4

MW-2D-5

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### TABLE 2 Summary of VOCs and Chloride Analytical Data - Monitoring Wells Town Garage / Radio Beacon Site

Londonderry, New Hampshire Monitoring Well Location Chloride (mg/l) 1,1-DCA ( μ g/l) 1,1-DCE ( μ g/l) 1,1,1-TCA (μ g/l) Other VOCs ( μ g/l) Cleanup Levels 250 mg/l 81 μ g/l 7 μ g/l 200 μ g/l Date

11/19/01 NS 100 48 52 17 - Chloroethane 11/15/02 NS 57 28 28 7 - Chloroethane 11/04/03 NS 57 28 19 10 - Chloroethane 11/04/04 NS 46 18 11 7 - Chloroethane 11/29/05 NS 36 18 8 5 - Chloroethane 11/13/06 NS 33 18 7 5 - Chloroethane 12/11/06 NS 36 21 8 6 - Chloroethane 11/09/07 NS 21 14 3 Nov-90 42 BDL BDL BDL 05/17/94 39 BDL BDL BDL 11/03/94 74 6.8 BDL BDL 04/17/95 29 BDL BDL BDL

10/11/95 137 BDL BDL BDL 1.1 - Chloroethane 1.7 - THM 2.5 - MTBE 05/13/96 20 BDL BDL BDL Nov-90 580 15 BDL BDL 05/17/94 4,537 11 5.8 BDL 12/01/94 4 260 11 6 2 BDL MW-2D-6

(cont.)

MW-2R Installed 10/30/06



### MW-3S

12/01/94 4 , 260 11 6

. 2 BDL 04/17/95 4,425 9.4 5.1 BDL 10/11/95 212 11 5.2 BDL 05/13/96 4,400 12 8.3 BDL 11/26/96 NS 8 4 BDL 11/20/97 NS 8 6 BDL 11/09/98 NS 7 4 BDL 11/22/99 NS 5 3 BDL 11/17/00 NS 6 2 BDL 11/19/01 NS 6 2 BDL 11/14/02 NS 4 2 BDL 11/05/03 NS 4 1 BDL 11/03/04 NS 3 1 BDL 11/28/05 NS 3 1 BDL Nov-90 2,880 BDL BDL BDL 05/11/94 1,124 4.2 BDL BDL 1.40 - Chloroethane 11/03/94 3,124 6.6 BDL BDL 04/25/95 2,010 3.6 BDL BDL 4.10 - MTBE 2.20 - Chloroethane 10/17/95 3,300 4.6 BDL BDL 1.2 - MTBE 04/24/96 1,210 2.8 BDL BDL 2.7 - Chloroethane MW-4D* Nov-90 23,500 19 18 25

MW-4D-1 04/26/96 3,810 7.7 5.9 3.8 2 - Carbon disulfide 6.2 - THM 43 - MEK 2.1 - Methylene chloride 2.9 - Toluene MW-4S MW-3D

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### TABLE 2 Summary of VOCs and Chloride Analytical Data - Monitoring Wells Town Garage / Radio Beacon Site

Londonderry, New Hampshire Monitoring Well Location Chloride (mg/l) 1,1-DCA ( μ g/l) 1,1-DCE ( μ g/l) 1,1,1-TCA (μ g/l) Other VOCs ( μ g/l) Cleanup Levels 250 mg/l 81 μ g/l 7 μ g/l 200 μ g/l Date

04/26/95 24,850 5.1 7.5 4.2 3.50 - THM 9.80 - Toluene

04/26/96 22,300 8 11 4.5 2.5 - Carbon disulfide 3.2 - THM 3 - Methylene Chloride 4.5 - Toluene 11/25/96 NS 7 7 3 3 - THM 4 - Toluene 11/20/97 NS 10 10 2 2 - THM 3 - Toluene 11/10/98 NS 9 5 BDL 2 - Toluene 11/23/99 NS 9 5 BDL 4 - Toluene 20 - MEK

11/21/00 NS 13 6 BDL 20 - Acetone 50 - MEK 4 - Toluene

11/20/01 NS 13 8 3 20 - Acetone 2 -THM 40 - MEK 4 l MW-4D-2

4- To luene 11/15/02 NS 6 2 BDL 20 - MEK 3 - Toluene

11/04/03 NS 9 6 3 20 - Acetone 2 -THM 30 - MEK 4 - Toluene 11/04/04 NS 9 5 BDL 20 - MEK 4 - Toluene

11/29/05 NS 9 6 2 10 - Acetone 20 - MEK 4 - Toluene 06/02/94 22,000 7.6 6.5 41 3.50 - MTBE 12/06/94 19,720 9.2 6.9 43 2.90 - MTBE 04/26/95 12,000 9.5 7.5 31 10/17/95 12,900 8.9 3.6 21 2.2 - MTBE 04/26/96 13,700 11 5.6 24 2.4 - MTBE 2.7 - Chloroethane 11/25/96 NS 9 2 15 11/20/97 NS 10 2 10 11/10/98 NS 7 1 6 11/23/99 NS 4 BDL 3 11/21/00 NS 3 BDL BDL 11/20/01 NS 3 BDL BDL 11/15/02 NS BDL BDL BDL 11/04/03 NS BDL BDL BDL 11/04/04 NS BDL BDL BDL 11/29/05 NS BDL BDL BDL MW-4D-3

S:\CONDATA\2000s\2049.01\Originals\2007 Annual Report\Tables.xls Page 4 of 8 Sanborn, Head & Associates, Inc.

### TABLE 2 Summary of VOCs and Chloride Analytical Data - Monitoring Wells Town Garage / Radio Beacon Site

Londonderry, New Hampshire Monitoring Well Location Chloride (mg/l) 1,1-DCA ( μ g/l) 1,1-DCE ( μ g/l) 1,1,1-TCA (μ g/l) Other VOCs ( μ g/l) Cleanup Levels 250 mg/l 81 μ g/l 7 μ g/l 200 μ g/l Date
Nov-90 3,550 14 21 190 05/18/94 3,640 2.2 13 89 11/03/94 2,040 BDL 14 100 04/25/95 4,072 BDL 9.4 43 10/17/95 3,000 2.1 13 64 1.4 - PCE 04/24/96 5,120 2.2 15 81 11/25/96 NS BDL 9 55 11/20/97 NS BDL 12 52 11/10/98 NS BDL 5 27 11/23/99 NS BDL 4 21 12/06/00 NS BDL 5 19 7 - MTBE 11/20/01 NS BDL 3 11 10 - MTBE 11/15/02 NS BDL 4 11 5 - MTBE 11/04/03 NS BDL 3 9 11/04/04 NS BDL 2 5 11/29/05 NS BDL 1 4 MW-5D* Nov-90 1,110 9 10 66

MW-5D-1 04/25/96 NS 5 2.4 4.8 96 - Acetone 2.4 - Carbon disulfide MW-5S

20 - Toluene
MW-5D-2 04/25/96 1,290 BDL BDL 7.1 5.2 - Carbon disulfide 5.1 - THM 4.1 - Toluene 06/03/94 1,900 3.1 5.4 15 04/25/96 1,790 BDL 2.6 6.3 06/03/94 6,900 NS NS NS 12/06/94 6,110 BDL BDL 4.5 04/25/95 5,780 BDL BDL BDL 10/11/95 5,760 1 TRACE 2.2 1.6 - MTBE 04/25/96 6,030 BDL BDL 3.7 3.5 - MTBE 11/25/96 NS BDL BDL 2 11/20/97 NS BDL BDL BDL 11/10/98 NS BDL BDL BDL 11/23/99 NS BDL BDL BDL 11/21/00 NS BDL BDL BDL 10 - MTBE Nov-90 100 BDL BDL BDL 05/17/94 191 BDL BDL BDL 05/25/94 174 NS NS NS 11/03/94 301 BDL BDL BDL 04/17/95 118 BDL BDL BDL MW-6D* 11/01/90 NS 13 6 BDL

06/02/94 NS 6.6 2.5 BDL 3.80 - THM 7.50 - Toluene

340 - MEK 150 - Acetone
05/09/96 8,480 16 2.2 BDL 7.8 - Carbon disulfide 40 - MEK 25 - Toluene MW-5D-3

MW-6S

MW-6D-1 MW-5D-4

S:\CONDATA\2000s\2049.01\Originals\2007 Annual Report\Tables.xls Page 5 of 8 Sanborn, Head & Associates, Inc.

### TABLE 2 Summary of VOCs and Chloride Analytical Data - Monitoring Wells Town Garage / Radio Beacon Site

Londonderry, New Hampshire Monitoring Well Location Chloride (mg/l) 1,1-DCA ( μ g/l) 1,1-DCE ( μ g/l) 1,1,1-TCA (μ g/l) Other VOCs ( μ g/l) Cleanup Levels 250 mg/l 81 μ g/l 7 μ g/l 200 μ g/l Date
06/02/94 8,800 11 7 BDL 1.50 - Toluene 12/01/94 9,050 13 7.1 BDL 04/20/95 8,714 10 6.3 BDL 1.10 - MTBE 1.80 - Toluene 10/10/95 9,300 12 6.1 BDL 2.3 - MTBE 05/09/96 7,350 11 6.8 BDL 2.6 - Toluene 11/26/96 NS 10 5 BDL 11/20/97 NS 12 8 BDL 1 - Toluene 11/09/98 NS 10 6 BDL 2 - Toluene 11/22/99 NS 9 4 BDL 1 - Toluene 11/17/00 NS 11 4 BDL 11/19/01 NS 11 5 BDL 1 - Toluene 11/14/02 NS 13 5 BDL 1 - Toluene 11/05/03 NS 9 3 BDL 2 - Toluene 11/03/04 NS 8 2 BDL 1 - Toluene 11/28/05 NS 6 1 BDL 1 - Toluene 06/02/94 2,200 3.2 1.5 BDL 12/01/94 1,860 3.6 1.7 BDL 1.50 - Toluene 04/20/95 2,379 3 1.4 BDL 1.50 - Toluene MW-6D-3 MW-6D-2

10/10/95 7,850 14 6.3 BDL 2.40 - MTBE 05/09/96 1,570 2.6 BDL BDL 06/02/94 3,800 5.2 BDL BDL 2.60 - 1,2 DCA 12/01/94 4,590 8.5 3.4 BDL 04/20/95 3,621 5 2.1 BDL 10/10/95 7,410 18 6.6 4.5 1.40 - MTBE 05/09/96 2,210 3.5 2.1 BDL 11/26/96 NS 6 3 BDL 1 - Toluene 11/20/97 NS 18 9 BDL 11/09/98 NS 16 7 BDL 1 - Toluene 11/22/99 NS 9 4 BDL 11/17/00 NS 12 4 BDL 11/19/01 NS 17 6 BDL 11/14/02 NS 16 5 BDL 1 - Toluene 11/05/03 NS 7 2 BDL 11/03/04 NS 6 2 BDL 11/28/05 NS 2 BDL BDL 1 - Toluene Nov-90 46 BDL BDL BDL 05/17/94 95 BDL BDL BDL 11/03/94 107 BDL BDL BDL 04/17/95 70 BDL BDL BDL 11/01/90 35 BDL BDL BDL 05/17/94 105 BDL BDL BDL 12/06/94 103 BDL BDL BDL 04/17/95 99 BDL BDL BDL MW-7D MW-7S MW-6D-4

S:\CONDATA\2000s\2049.01\Originals\2007 Annual Report\Tables.xls Page 6 of 8 Sanborn, Head & Associates, Inc.

### TABLE 2 Summary of VOCs and Chloride Analytical Data - Monitoring Wells Town Garage / Radio Beacon Site

Londonderry, New Hampshire Monitoring Well Location Chloride (mg/l) 1,1-DCA ( μ g/l) 1,1-DCE ( μ g/l) 1,1,1-TCA (μ g/l) Other VOCs ( μ g/l) Cleanup Levels 250 mg/l 81 μ g/l 7 μ g/l 200 μ g/l Date
Nov-90 3,460 BDL BDL BDL 05/10/94 597 BDL BDL BDL 11/03/94 2,105 2.1 BDL 4.6 04/18/95 895 BDL BDL BDL 10/16/95 2,700 BDL BDL 5.8 05/03/96 865 BDL BDL BDL Nov-90 9,130 48 28 BDL 05/10/94 1,004 BDL BDL 2 11/03/94 2,439 2.7 1.3 2.7 04/18/95 1,122 BDL BDL 1.2 10/16/95 8,700 11 6 2.9 1.8 - MTBE 05/03/96 2,140 2.5 BDL 3 11/27/96 NS 7 4 BDL 11/20/97 NS 7 5 BDL 11/09/98 NS 5 3 BDL 11/22/99 NS 3 2 BDL 16 - Chloromethane 21 - Vinyl Chloride 20 - Acetone MW-8S

MW-8D

11/17/00 N S 3 1 BDL 15 - Carbon Disulfide 46 - Benzene 9 - Toluene 4 - Styrene 11/19/01 NS 4 1 BDL 11/14/02 NS 2 1 BDL 11/04/03 NS 3 1 BDL 11/03/04 NS 2 BDL BDL 11/28/05 NS BDL BDL BDL Nov-90 530 BDL BDL BDL 05/11/94 499 BDL BDL 1.6 11/03/94 869 BDL BDL 12 04/18/95 642 BDL BDL 1.2 10/13/95 860 BDL BDL 11 05/02/96 490 BDL BDL BDL 06/02/96 191 BDL BDL BDL 12/08/94 347 BDL BDL BDL 1.4 - Toluene 04/26/95 228 BDL BDL BDL 10/17/95 200 BDL BDL BDL 05/07/96 130 BDL BDL BDL 05/18/94 148 1.5 BDL BDL 1.1 - Chloromethane 12/09/94 118 2.3 BDL BDL 04/26/95 162 1.4 BDL BDL 10/17/95 200 1.8 BDL BDL 05/07/96 156 BDL BDL BDL RWGD MW-9S

RWGS

S:\CONDATA\2000s\2049.01\Originals\2007 Annual Report\Tables.xls Page 7 of 8 Sanborn, Head & Associates, Inc.

### TABLE 2 Summary of VOCs and Chloride Analytical Data - Monitoring Wells Town Garage / Radio Beacon Site

Londonderry, New Hampshire

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 detection limit. "NS" indicates not sampled.
2. Underline indicates that the well was sampled during 2007. 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 μ g/l; 1,1 DCE = 7 μ g/l; 1,1,1 TCA = 200 μ g/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 μ g/l and 2 μ g/l respectively.

S:\CONDATA\2000s\2049.01\Originals\2007 Annual Report\Tables.xls Page 8 of 8 Sanborn, Head & Associates, Inc.

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μ g/l)Figure 2Concentration vs. Time PlotMW-2D-6/MW-2RTown Garage/Radio Beacon SiteLondonderry, New HampshireS:\CONDATA\2000s\2049.01\Originals\2007 Annual Report\MonWellPlot.xlsSanborn, Head & Associates, Inc.0.1110Jan-94 Jan-95 Jan-96 Dec-96 Jan-98 Jan-99 Jan-00 Dec-00 Jan-02 Jan-03 Jan-04 Dec-04 Jan-06 Jan-07 Jan-08

Concentration ( μSample Dates1,1,1-TCA1,1-DCA1,1-DCE1,1,1-TCA Cleanup Goal (200)1,1-DCA Cleanup Goal (81)1,1-DCE Cleanup Goal (7)Monitoring well MW-2D-6 was replaced by monitoringwell MW-2R on October 30, 2006. Data points shownfrom January 1994 through December 2005 reflect samplescollected from monitoring well MW-2D-6. Data pointsshown after January 2006 reflect samples collected frommonitoring well MW-2R.

# ATTACHMENT A
WELL DECOMMISSIONING DOCUMENTATION

## Well Decommissioning Documentation

Pursuant to Revised Amendment No. 2 to the Statement of Work (SOW), dated June 2, 2006 and approved by the United States Environmental Protection Agency (USEPA) on June 12, 2006 Sanborn, Head & Associates, Inc. (SHA) has observed and documented the decommissioning of two shallow overburden monitoring wells (MW-2S and MW-5S) and four bedrock monitoring wells (MW-2D, MW-3D, MW-4D, MW-8D), installed at the Town Garage/Radio Beacon Site (the Site) in Londonderry, New Hampshire. Locations of these wells are depicted on Figure 1. The monitoring wells were decommissioned between October 9 and 12, 2007 by Geosearch, Inc. (Geosearch) of Fitchburg, Massachusetts. Decommissioning activities were observed by SHA. Logs of the six decommissioned wells are included in this Appendix.

S:\CONDATA\2000s\2049.01\Originals\2007 Annual Report\Well Decommissioning Documentation.docDescription Drilling Company: Geosearch, Inc. Foreman: J. Keenan Groundwater Readings Ref. Pt. 20.1' Stab. Time Time 10/11/07 Depth to Water

Stratum (after packing tube pulled)

Date Finished: 10/11/07 Checked By: S. Nerney
Depth

(ft)

0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 74 76 78 80 82 84 86 88 90 92 94 96 98 100 -----0'----- 09:30

No soil samples obtained. Topsoil (0 to 1.2') Concrete Cap (1.2 to 2')

6" Steel Casing (1.5 to 29')

Bedrock Borehole (29 to 185')

Cement/Bentonite Grout (2 to 185') Top of PVC Drilling Method: CME 75 Truck Rig

Date Depth of Casing

Spoon Blows per 6 in Date Started: 10/11/07 Logged By: D. Porter

Pen/ Rec (in) Log PID/FID Values (ppmv) 09:30

Well Description Well Diagram

(after packing tube pulled) Top of PVC 20.1' 10/11/07DECOM OF MON WELL 2049.01_FORMER LONDONDERRY TOWN GARAGE_OCT07_LOGS.GPJ S:\CONDATA\GINT\OLD GINT LIBRARIES\040706 SHA - NEW LOGO.GLB 12/28/07 Sampling Method: N/A

Sheet: 1 of 2

Ground Elevation: N/A

Datum: N/A Project: Londonderry Town Garage Location: Londonderry, New Hampshire SHA Project No.: 2049.01

Geologic Description 

### Decommissioning Log of Monitoring Well MW-2D

Depth

(ft) Sample

No. Sample InformationGroundwater Readings Ref. Pt. 20.1' Stab. Time Time 10/11/07 09:30

Date Started: 10/11/07 Logged By: D. Porter

Description Depth to Water

Date Finished: 10/11/07 Checked By: S. Nerney
Depth

(ft)

100 102 104 106 108 110 112 114 116 118 120 122 124 126 128 130 132 134 136 138 140 142 144 146 148 150 152 154 156 158 160 162 164 166 168 170 172 174 176 178 180 182 184 186 188 190 192 194 196 198 200 -----185'----- Stratum 20.1' Top of PVC 10/11/07 09:30 Date Depth of Casing (after packing tube pulled) Drilling Company: Geosearch, Inc. Foreman: J. Keenan

Spoon Blows per 6 in Pen/ Rec (in) Drilling Method: CME 75 Truck Rig

PID/FID Values (ppmv) Sample Information Well Description Well Diagram Log Sampling Method: N/A

Sheet: 2 of 2 Ground Elevation: N/A

Datum: N/A Project: Londonderry Town Garage Location: Londonderry, New Hampshire SHA Project No.: 2049.01

Geologic Description Depth

(ft) 

### Decommissioning Log of Monitoring Well MW-2DDECOM OF MON WELL 2049.01_FORMER LONDONDERRY TOWN GARAGE_OCT07_LOGS.GPJ S:\CONDATA\GINT\OLD GINT LIBRARIES\040706 SHA - NEW LOGO.GLB 12/28/07 Sample No.S:\Condata\2000s\2049.01\Logs\Decommissioning Log of Monitoring Well MW

Ͳ2D 

### Decommissioning Log of Monitoring Well MW
Ͳ 2D

NOTES: 

## 1. Original well drilled and installed in October 1990 by LaFramboise for Metcalf & Eddy. A Solinst, Ltd. of Canada, Waterloo multilevel dedicated sampling system was installed in June 1991 by Metcalf & Eddy. 2. The sample tubes and cables that connect the sampling pumps and pressure transducers with the ground surface were pulled. The sample tubes and 4 of the 6 electrical cables were pulled from the well. The cables stretched and broke. Based on previous discussions with Solinst, the system was reportedly designed such that the individual sample tubes and cables will break away from the individual sampling ports if the corresponding tubes and cables were pulled. 3. Because of the remaining cables inside the central 3-inch diameter PVC conduit, the bottom depth of the central conduit was plunked to a depth of about 175 feet. 4. Since there were still cables within the central PVC conduit the tremie line could only be inserted down inside the conduit to a depth of about 175 feet. The conduit was filled, using the tremie line, with a cement/bentonite grout mixture. Grout was also placed using a tremie line above the top packer. 5. The approximately 6-inch diameter steel casing was cut approximately 1.5 feet below the ground surface. Concrete was added from approximately 1.2 to 2 feet below the ground surface. 6. Several inches of topsoil were spread over the grouted borehole flush with the ground surface.Drilling Company: Geosearch, Inc. Foreman: J. Keenan Groundwater Readings Ref. Pt. 6.2' Stab. Time Time 10/11/07 14:00 Top of PVC

Description Depth to Water

Date Finished: 10/11/07 Checked By: S. Nerney
Depth

(ft)

0

2

4

6

8

10

12

14

16

18

20

22

24

26

28

30

32

34

36

38

40

42

44

46

48

50 -----10'----- Stratum

-----0'----- No soil samples obtained.

NOTES: 1. Original well drilled and installed in October 1990 by LaFramboise for Metcalf & Eddy.
2. Well depth plunked at 10 feet from ground surface.
3. Using a tremie line, a cement/bentonite grout mixture was pumped into the well. The bottom of the 2-inch PVC well pipe was then punctured and the pipe was removed. Grout was placed to about 3 inches below the ground surface and several inches of topsoil were spread over the grouted borehole. Topsoil (0 to 0.3')

Cement/Bentonite Grout (0.3 to 10') Drilling Method: CME 75 Truck Rig

Date Depth of Casing Well installed -

Depth

(ft) Date Started: 10/11/07 Logged By: D. Porter
Spoon Blows per 6 in Pen/ Rec (in) Log Sampling Method: N/A

PID/FID Values (ppmv) Well Description Well DiagramDECOM OF MON WELL 2049.01_FORMER LONDONDERRY TOWN GARAGE_OCT07_LOGS.GPJ S:\CONDATA\GINT\OLD GINT LIBRARIES\040706 SHA - NEW LOGO.GLB 12/28/07

Sheet: 1 of 1 Ground Elevation: N/A

Datum: N/A Project: Londonderry Town Garage Location: Londonderry, New Hampshire SHA Project No.: 2049.01

Geologic Description 

### Decommissioning Log of Monitoring Well MW-2S

Sample Information Sample

No.Date Finished: 10/11/07 Checked By: S. Nerney Ground Elevation: N/A

Datum: N/A Groundwater Readings Ref. Pt. 8.25' Stab. Time Time 10/10/07

Stratum Description Top of Casing Depth to Water

Depth

(ft)

0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 74 76 78 80 82 84 86 88 90 92 94 96 98 100 Date Started: 10/10/07 Logged By: M. Thomas Drilling Company: Geosearch, Inc. Foreman: J. Keenan Drilling Method: CME 850 Tracked ATV
Sampling Method: N/A

-----0'----- No soil samples obtained. Topsoil (0 to 0.5') Concrete Cap (0.5 to 1.5')

6" Steel Casing (1 to 16')

Bedrock Borehole (16 to 184')

Cement/Bentonite Grout (1.5 to 184') Project: Londonderry Town Garage Location: Londonderry, New Hampshire SHA Project No.: 2049.01

Date Depth of Casing Well Installed -

Well Description Pen/ Rec (in)

Sheet: 1 of 2 Log PID/FID Values (ppmv) 10/10/07

Well Diagram Well Installed - Top of Casing 8.25'

Geologic Description 

### Decommissioning Log of Monitoring Well MW-3DDECOM OF MON WELL 2049.01_FORMER LONDONDERRY TOWN GARAGE_OCT07_LOGS.GPJ S:\CONDATA\GINT\OLD GINT LIBRARIES\040706 SHA - NEW LOGO.GLB 12/28/07 Spoon Blows per 6 in Sample

No. Sample Information Depth

(ft)8.25' Stab. Time Time 10/10/07

Stratum Description Ground Elevation: N/A

Datum: N/A

Depth

(ft)

100 102 104 106 108 110 112 114 116 118 120 122 124 126 128 130 132 134 136 138 140 142 144 146 148 150 152 154 156 158 160 162 164 166 168 170 172 174 176 178 180 182 184 186 188 190 192 194 196 198 200 Date Started: 10/10/07 Logged By: M. Thomas Drilling Company: Geosearch, Inc. Foreman: J. Keenan Drilling Method: CME 850 Tracked ATV
Sampling Method: N/A

-----184'----- Date Finished: 10/11/07 Checked By: S. Nerney 10/10/07 Well Installed - Ref. Pt. 8.25' Groundwater Readings Date Depth of Casing Well Installed - Depth to Water Top of Casing Project: Londonderry Town Garage Location: Londonderry, New Hampshire SHA Project No.: 2049.01

Spoon Blows per 6 in

Sheet: 2 of 2 Pen/ Rec (in) Depth

(ft) PID/FID Values (ppmv) Well Description Well Diagram Log Geologic Description 

### Decommissioning Log of Monitoring Well MW-3DDECOM OF MON WELL 2049.01_FORMER LONDONDERRY TOWN GARAGE_OCT07_LOGS.GPJ S:\CONDATA\GINT\OLD GINT LIBRARIES\040706 SHA - NEW LOGO.GLB 12/28/07 Sample No. Sample InformationS:\Condata\2000s\2049.01\Logs\Decommissioning Log of Monitoring Well MW

Ͳ3D 

### Decommissioning Log of Monitoring Well MW
Ͳ 3D

NOTES:



## 1. Original well drilled and installed in October 1990 by LaFramboise for Metcalf & Eddy. 2. Well depth plunked at 184 feet from ground surface. 3. Well filled with a cement/bentonite grout mixture using a tremie line. The approximately 6-inch diameter steel casing was cut off approximately 1 foot below the ground surface. Concrete was added from approximately 0.5 to 1.5 feet. 4. Several inches of topsoil were spread over the grouted borehole at theground surface.

.0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 74 76 78 80 82 84 86 88 90 92 94 96 98 100 Ref. Pt. Stab. Time Time 10/10/07

Stratum Description Date Finished: 10/10/07 Checked By: S. Nerney

Geologic Description Not Measured

Date Started: 10/09/07 Logged By: M. Thomas Drilling Company: Geosearch, Inc. Foreman: J. Keenan Drilling Method: CME 850 Tracked ATV
Sampling Method: N/A

Sheet: 1 of 2 Ground Elevation: N/A

Datum: N/A

-----0'----- Depth

(ft)

No soil samples obtained. Topsoil (0 to 0.5') Formation Material (0.5 to 1.5') Concrete Cap (1.5 to 3')

6" Steel casing (2 to 28')

Bedrock Borehole (28 to 185')

Cement/Bentonite Grout (3 to 185') Groundwater Readings Date Depth of Casing Depth to Water Project: Londonderry Town Garage Location: Londonderry, New Hampshire SHA Project No.: 2049.01

10/10/07

PID/FID Values (ppmv) Spoon Blows per 6 in Well Description Well Diagram Not Measured

Log 

### Decommissioning Log of Monitoring Well MW-4DDECOM OF MON WELL 2049.01_FORMER LONDONDERRY TOWN GARAGE_OCT07_LOGS.GPJ S:\CONDATA\GINT\OLD GINT LIBRARIES\040706 SHA - NEW LOGO.GLB 12/28/07 Pen/ Rec (in) Sample

No. Sample Information Depth

(ft)Drilling Company: Geosearch, Inc. Foreman: J. Keenan Date Finished: 10/10/07 Checked By: S. Nerney
Depth

(ft)

100 102 104 106 108 110 112 114 116 118 120 122 124 126 128 130 132 134 136 138 140 142 144 146 148 150 152 154 156 158 160 162 164 166 168 170 172 174 176 178 180 182 184 186 188 190 192 194 196 198 200 

### Decommissioning Log of Monitoring Well MW-4D

Date Started: 10/09/07 Logged By: M. Thomas 10/10/07 Drilling Method: CME 850 Tracked ATV
Sampling Method: N/A

Sheet: 2 of 2 Ground Elevation: N/A

Datum: N/A Project: Londonderry Town Garage Location: Londonderry, New Hampshire SHA Project No.: 2049.01

Geologic Description

-----185'----- Depth of Casing Not Measured 10/10/07

Description Date

Stratum Depth to Water Not Measured Groundwater Readings Ref. Pt. Stab. Time Time

Pen/ Rec (in) PID/FID Values (ppmv) Well Description Well Diagram LogDECOM OF MON WELL 2049.01_FORMER LONDONDERRY TOWN GARAGE_OCT07_LOGS.GPJ S:\CONDATA\GINT\OLD GINT LIBRARIES\040706 SHA - NEW LOGO.GLB 12/28/07 Spoon Blows per 6 in Sample

No. Sample Information Depth

(ft)S:\Condata\2000s\2049.01\Logs\Decommissioning Log of Monitoring Well MW

Ͳ4D 

### Decommissioning Log of Monitoring Well MW
Ͳ4D
NOTES:
1. 

## Original well drilled and installed in October 1990 by LaFramboise for Metcalf & Eddy. A Solinst, Ltd. of Canada, Waterloo multilevel dedicated sampling system was installed in June 1991 by Metcalf & Eddy. 2. The sample tubes and cables that connect the sampling pumps and pressure transducers with the ground surface were pulled. Three sample tubes and one of three electric cables were pulled from the well. Two cables stretched and broke. Based on previous discussions with Solinst, the system was reportedly designed such that the individual sample tubes and cables will break away from the individual sampling ports if the corresponding tubes and cables were pulled. 3. Well depth above the top packer plunked at about 7 feet from ground surface. Because of the remaining cables inside the central 3-inch diameter PVC conduit, the bottom depth of the central conduit was plunked to a depth of about 157 feet. 4. Since there were still cables within the central PVC conduit the tremie line could only be inserted inside the conduit to a depth of about 165 feet. The conduit was filled, using the tremie line, with a cement/bentonite grout mixture. Grout was also placed using a tremie line above the top packer. 5. After placing the grout, the top section (approximately 7 feet long) of the central PVC conduit was removed by unthreading the section. 6. The approximate 6-inch diameter steel casing was cut approximately 2 feet below the ground surface. Concrete was added from approximately 1.5 to 3 feet below the ground surface because of the grout settlement overnight. 7. Approximately 1.5 feet of topsoil were spread over the grouted borehole at the ground surface.0

2

4

6

8

10

12

14

16

18

20

22

24

26

28

30

32

34

36

38

40

42

44

46

48

50 Stab. Time Time 10/09/07

Stratum Description Date Finished: 10/10/07 Checked By: S. Nerney Ref. Pt. Groundwater Readings

Date Started: 10/09/07 Logged By: M. Thomas Drilling Company: Geosearch, Inc. Foreman: J. Keenan Drilling Method: CME 850 Tracked ATV
Sampling Method: N/A

Sheet: 1 of 1 Ground Elevation: N/A

Datum: N/A Project: Londonderry Town Garage Location: Londonderry, New Hampshire SHA Project No.: 2049.01

-----30.3'----- Depth

(ft)

-----0'----- No soil samples obtained.

NOTES: 1. Original well drilled and installed in October 1990 by LaFramboise for Metcalf & Eddy.
2. Well depth plunked at 30.3 feet from ground surface.
3. Using a tremie line, a cement/bentonite grout mixture was pumped into the well. The bottom of the 2-inch PVC well pipe was then punctured and the well pipe was removed. Grout was placed to about 6-inches below the ground surface and several inches of topsoil were spread over the ground borehole. Topsoil (0 to 0.5')

Cement/Bentonite Grout (0.5 to 30.3') 15.05' Date Depth of Casing Well Installed Depth to Water Top of Casing

PID/FID Values (ppmv) Geologic Description Pen/ Rec (in) Log Spoon Blows per 6 in Well Description Well Diagram 

### Decommissioning Log of Monitoring Well MW-5SDECOM OF MON WELL 2049.01_FORMER LONDONDERRY TOWN GARAGE_OCT07_LOGS.GPJ S:\CONDATA\GINT\OLD GINT LIBRARIES\040706 SHA - NEW LOGO.GLB 12/28/07 Sample No. Sample Information Depth

(ft)Ground Elevation: N/A

Datum: N/A

Top of Casing Groundwater Readings Ref. Pt. 21.2' Stab. Time Time 10/12/07 -

Stratum NA 63'

Date Finished: 10/12/07 Checked By: S. Nerney
Depth

(ft)

0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 74 76 78 80 82 84 86 88 90 92 94 96 98 100 Date Started: 10/12/07 Logged By: M. Thomas Drilling Company: Geosearch, Inc. Foreman: J. Keenan Drilling Method: CME 75 Truck Rig
Sampling Method: N/A

-----65.5'----- Description

-----0'----- No soil samples obtained.

NOTES: 1. No original log of MW-8D was available; however, it is believed the well was installed at a similar time period (October 1990) and by LaFramboise for Metcalf & Eddy as the other site wells.
2. Well depth plunked at 65.5 feet from ground surface.
3. Well filled with a cement/bentonite grout mixture using a tremie line. The approximately 6-inch diameter steel casing was cut off approximately 1.5 feet below the ground surface. Concrete was added from approximately 1 to 3 feet because of grout settlement.
4. Soil was placed from about 0.3 to 1 foot below the ground surface. Rubber landscape chips were placed from the ground surface to 0.3 feet below the ground surface. Rubber Landscaping Chips (0 to 0.3') Formation Material (0.3 to 1') Concrete Cap (1 to 3')

6" Steel Casing (1.5 to 22.5')

Bedrock Borehole (22.5 to 65.5') Depth to Water Project: Londonderry Town Garage Location: Londonderry, New Hampshire SHA Project No.: 2049.01

Date Depth of Casing

Cement/Bentonite Grout (3 to 65.5')

Sheet: 1 of 1 Spoon Blows per 6 in Pen/ Rec (in) Geologic Description Log PID/FID Values (ppmv) Well Description Well Diagram 

### Decommissioning Log of Monitoring Well MW-8DDECOM OF MON WELL 2049.01_FORMER LONDONDERRY TOWN GARAGE_OCT07_LOGS.GPJ S:\CONDATA\GINT\OLD GINT LIBRARIES\040706 SHA - NEW LOGO.GLB 12/28/07 Depth (ft) Sample

No. Sample Information

# ATTACHMENT B GROUNDWATER QUALITY FIELD SAMPLING SUMMARY FORM

### Groundwater Quality Field Sampling Summary

d d i)

Comments Project Number: 2049.01 Date: November 9, 2007 Project Name: Former Londonderry Town Garage Project Location: Londonderry, New Hampshire pH Meter: YSI 556 Project Manager: S. Nerney Conductivity Meter: YSI 556 Collector: M. Thomas Water Level Meter: Solinst Weather: P. Cloudy, 40s Dissolved Oxygen: YSI 556
Field Measurements Sampling Location MW-2R Reference Point PVC Reference Point Elevation (feet) 355.69 Depth to Floating Product (feet) - Depth to Water (feet) 3.62 Water Table Elevation (feet) 352.07 Depth to Bottom (feet) 48.5

H( d d i ) p H ( stan ar un ts 6 8

. Specific Conductance ( μ S/cm) 12,500 Temperature (oC) 12.9 Dissolved Oxygen (mg/L) 0.3 Date of Sample 9-Nov Sample Time 1155 Comment Reference Number 1

1. Sample collected using low flow sampling techniques.

S:\CONDATA\2000s\2049.01\Originals\2007 Annual Report\20071109 GwQFSS.xls Page 1 of 1 Sanborn, Head & Associates, Inc.

# ATTACHMENT C
ANALYTICAL LABORATORY DATA REPORT

# ----+~+-----------------------------e __

a_s_t_e

__ r_n

__ a

__ n_a

__ l_yt

__ 

# i_c_a

__ l

___

, ·,, ... . '! \ • ' t ' !

. . 

### Scott Nerney Sanborn, Head 

### & Associates , Inc

. (NH) 20 Foundry Street Concord , NH 03301

Subject: Laboratory Report
Eastern Analytical, Inc. 10: 

### Client Identification : Date Received :

Dear Mr. Nerney : 65924 Londonderry Town Garage 12049

. 01 11/9/2007

Enclosed please find the laboratory report for the above identified pro j ect. All analyses were performed in accordance with our 

### QNQC Program

. Unless otherwise stated , holding times , preservation techniques , container types , and sample condit i ons adhered to EPA Protoco l. Samples wh i ch were collected by Eastern Analyt i cal, Inc. (EAI) were collected in accordance with approved EPA procedures

. Eastern Analytical, Inc. (EA I ) 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 accredi t ed parameters

. The following standard abbreviations and conventions apply throughout all EAI reports : Solid samples are reported on a dry weight basis, unless otherwise noted <: "less than " followed by the detection limit TNR: Testing Not Requested NO: None Detected, no established detection limit RL: Reporting Limits %R : % Recovery
Eastern Analyt i cal Inc

. maintains cert i fication i n the following states: Connecticut (PH

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

- NH005), New Hampshire/NElAP (1012), Rhode Island (269) and Vermont (VT1012)

. This report package contains the following informati on : Sample Conditions summary, Ana l ytical Results/Data and copies of the Cha i n of Custody

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

### the laboratory

. 

### Analytical Deviation 

### & QA/QC Documentation: Quality Control Samples associated w i th this project are inc l uded in th i s report

. At a minimum , a Method B l ank and Labo ratory Control Sample (LCS) are reported. Matrix Spikes and Duplicates are reported where applicable

. Deviat i ons are narrated on the QC pages

. 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 th i s opportunity to be of service and look forward to your continued patronage

. Sincerely ,

# ~~nC Lorraine Olashaw, Lab D i rector 

## (( ·llj ·U':tDate

· I 

### i

. \. I i '

. :

. : 

### \\" \\W. l'a ibhs.o1 m #of pages (excluding cover letter)



# · .

# SAMPLE CONDITIONS PAGE

Eastern Analytical, Inc

. 10# : 

## 65924
Client: Sa n born, H e ad & 

### Associates , Inc

. ( NH) Client D esig n ation: Londonderry Town Garag e 12049

. 01

Temperatur e up o n rece i pt ( 0 

### C}: 

## 4

. 4 Received on i c e or cold pack s (Ye s/ No): 

## Y

Date Date S am ple % Dry la b iD S amp l e I D Received Sampled M atrix W ei ght E xc epti on s / C o mment s ( oth e r than therm a l p re s ervati o n )
65924.01 MW-2R
659 2 4

. 02 T rip Blank 1 1 /9/07 11/9/07 aqueous 11/9/0 7 10/29/07 aqueous Ad h eres to Samp l e Accept ance Policy
Adheres to S amp l e Acceptance P olicy

Samples were properly preserved and the pH measured when applicable unless otherwise noted

. Analysis ofsolids for pH, Flashpoint , lgnitibility, Paint Filter , Corrosivity , Conductivity and Specific Gravity 

### ar e 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: Jnorganics, 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. www

. eailabs.com Phone: (603) 228

- 0525 

## 1

# LABORA TORY REPORT

Eastern Analytical , Inc. 10#: 

## 65924 Client: 

### Sanbo rn, Head & Assoc i at e s, I nc. Client Designat i on: 

### L o n d onde r r y To wn G arag e 12 04 9. 0 1 (NH) S a m p l e 10 : MW

- 2R Trip Blank

Lab Sa mple 10: 65924

. 01 65924

. 02 Matr ix: aq u eous aqueous D at e Sampled : 1 1 /9/07 10/29/07 D ate Re c e i v e d : 1 1 /9/07 11/9/07 U nits: ug/1 ug/1 Date o f A nal y s is: 11/10/07 11/10/07 Anal y st: BAM BAM M et ho d : 8260B 8260B D ilu t ion Fa ctor :
Dichlorodifluoromethane <5 <5 Chloromethane <5 <5 Viny l ch loride <2 <2 Bromo methane <2 <2 Ch l oroethane <5 <5 T richlorof l uoromet ha n e <5 <5 Di ethyl Ether <5 <5 Acetone < 10 <10 1 ,1-Dichloroethene 

### 14 < 1 tert-Buty l A l coho l (TBA) < 30 < 30 Met h y l e n e chloride <5 <5 Carbon disulfide <5 

### 6 Methy l -t-bu tyl ether(MTBE) <5 <5 E thy l -t

- buty l eth er(E T B E ) <5 <5 Isopropy l ethe r (D I PE ) <5 <5 t ert-amy l methyl ether(TAME) <5 <5 trans-1

. 2-Dichloroet hene <2 <2 1, 1 -Dichloroet hane 

### 21 <2 2 , 2

- Dichloropropane <2 <2 cis-1,2-Dichloroethene <2 <2 2-B u tanone( M EK) < 10 <10 Bromoch l oromethane <2 <2 Tetrahydrofuran{TH F ) < 10 < 10 Chloroform <2 <2 1,1,1- Trichloroethane 

### 3 <2 Carbon tetrach l o ride <2 <2 1 ,1-Dichloropropene <2 <2 Benzene < 1 < 1 1 ,2-Dichlo roe t han e <2 <2 T rich l oroethene <2 <2 1 , 2

- D i chloropropane <2 <2 Dibromomethane <2 <2 B romodichlorom ethane <2 <2 4- M ethyl-2-pen t a n one(MIB K ) < 10 <10 cis -1 ,3- Di ch lo r op rop e ne <2 <2 Toluene < 1 < 1 t rans-1 , 3

- Dichloropropene <2 < 2 1, 1 , 2- Trichloroethane <2 < 2 2-Hexanone < 10 < 10 T etrachloroethene <2 <2 1 , 3-Dich l oropropane <2 <2 Dibromochloromethane <2 <2 1,2

- Dib romoeth a n e(EDB) <2 <2 Chlo robenzene <2 <2 1 , 1,1 , 2- Tetrach l oroethane <2 <2 Ethvlbe n zene < 1 < 1 

# eastern analytical, inc. www

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

## 2

# li\i\1\1 LAB ORA TORY REPORT

Eastern Analytical , 

## Inc. 10#: 65924 Cl i ent: S a nbo rn, Head & 

### A ss o c i a te s, Inc

. (NH) Client Designation : Lond o nd e r ry T o wn Gara ge 12 0 49 .0 1

Sa mpl e ID : M W-2R Tri p Blank

l a b S a m pl e ID: 65924

. 01 65924.02 M at r ix: aqueous aqueous D at e Sa m p led : 1 1 /9/07 10 /29/07 Da t e Re ceived: 11/9/07 1 1/9/07 Unit s : ug/1 ug/1 Date o f A n a lysis: 1 1/10/07 1 1 / 1 0/07 A n a l y s t : BAM BAM Method : 8260B 8260B D i luti o n Fa c t o r :**mp Xylene**  < 1 < 1 o-Xylene < 1 <1 Styrene < 1 < 1 B romoform <2 <2 lsoPropylbenzene < 1 < 1 Bromo benzene <2 <2 1,1,2,2- Tetrachloroethane <2 <2 1,2,3- T rich l orop ropane <2 <2 n-Propyl benzene < 1 < 1 2-C h lorotolue n e <2 <2 4

- C h lorotoluene <2 <2 1 , 3,5-T r i met hy l benzene < 1 < 1 tert-B u tylbenzene < 1 < 1 1,2 ,4- Trimethylbenzene < 1 < 1 sec-B u tylbenzene < 1 < 1 1,3-Dichlorobenzene < 1 < 1 p-lsopropy l toluene < 1 < 1 1 A

- Dic hl orobenzene < 1 < 1 1,2

- Dichlorobenzene < 1 < 1 n - Bu tylbenze n e < 1 < 1 1,2-Dibromo

- 3-chloropropane <2 <2 1 ,2,4-Tr ichlo robenzene < 1 < 1 Hexac h lorobutadiene < 1 < 1 N aphtha l ene <5 <5 1 , 2 ,3- T richlorobenzene < 1 < 1 4 -Bromofluorobenzene (surr) 9 6 % R 97 % R 1 .2-Dichlo robe n zene-d 4 (s u rr) 103 % R 1 04 % R



### A l ow l evel of carbon disulfid e w as found i n 

### the T rip Blank. There is no impact to the data since no carbon disulfide was fou n d in t he sa m p l e.



# eastern analytical , i nc. www

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

## 3

# lllAA I LA B O RA TORY REPORT

E as tern A nal y tic al , In c. 10 #: 65 9 2 4 Bat ch 1 0:

Client: Sanborn, H ead 

### & Associa t es, I nc. Client Designation : L ondonde rr y T own Garage 

### 12049.01 

# QC Report Date of Ana l ysis Parameter Name B l ank LCS LCS Dup Units Method

-- ··- 

### . 

## - ----- -

Dichlorodifluoromethane <5 ug/1 11/10/07 82608 Chloromethane <5 ug/1 11/10/07 82608 Vinyl chloride <2 ug/1 11/10/07 82608 8romomethane <2 ug/1 11/10/07 82608 Chloroethane <5 ug/1 11/10/07 82608 T richlorofluoromethane <5 ug/1 11/10/07 82608 Diethyl Ether <5 ug/1 11/10/07 82608 Acetone < 10 ug// 11110/07 82608 1,1-Dichloroethene < 1 24 (119 %R) 23 (116 %R) (3 RPD) ug/1 11/10/07 82608 tert-Butyl Alcohol (T8A) 

### < 30 ug/1 11/10/07 82608 Methylene chloride <5 ug/1 11/10/07 82608 Carbon disulfide <5 ug/1 11/10/07 82608 Methyl-t-butyl ether(MT8E) <5 ug/1 11110/07 82608 Ethyl-t-butyl ether(ET8E) <5 ug/1 11/10/07 82608 Isopropyl ether(DIPE) <5 ug/1 11/10/07 82608 tert-amyl methyl ether(T AME) <5 ug/1 11/10/07 82608 trans-1,2-Dichloroethene <2 ug /1 11/10/07 82608 1 ,1- Dichloroethane <2 ug/1 11/10/07 82608 2,2-Dichloropropane <2 ug/ 1 11/10/07 82608 cis-1 .2-Dichloroethene <2 ug/1 11/10/07 82608 2-8utanone(MEK) < 10 ug/1 11/10/07 82608 Bromochloromethane <2 ug/1 11/10/07 82608 Tetrahydrofuran(THF) <10 ug/1 11/10/07 82608 Chloroform <2 ug/1 11/10 /07 82608 1 ,1 , 1

-Trichloroethane <2 ug/1 11/10/07 82608 Carbon tetrachloride <2 ug/1 11/10/07 82608 1,1-Dichloropropene <2 ugfl 11/10 /07 82608 Benzene <1 22 (111 %R) 23 (116 %R) (4 RPD) ug/1 11/10/07 82608 1 ,2-Dic hloroethane <2 ug/1 11/10/07 82608 

### Trichloroethene 

### <2 21 (107 %R) 22 (110 %R) (3 RPD) ug/1 11/10/07 82608 1,2-Dichloropropane <2 ug/1 11/10/07 82608 Dibromomethane <2 ug/1 11/10/07 82608 BromodichJoromethane 

### <2 ug/1 11/10/07 

### 82608 4 -Methyl-2-pe ntanone(M18K) < 10 ug/1 11/10/07 82608 cis-1 ,3-Dichloropropene <2 ug/1 11/10/07 82608 Toluene < 1 22 (110 %R) 22 (111 %R) (1 RPD) ug/1 11/10/07 82608 trans-1,3-Dichloropropene <2 ug/1 11/10/07 82608 1,1 , 2-Trichloroethane <2 ug/1 11/10/07 82608 2-Hexanone <10 ug/1 11/10/07 82608 T etrachloroethene <2 ug/1 11/10/07 82608 1,3-Dichloropropane <2 ug/1 11/10/07 82608 Dibromochloromethane <2 ug/1 11/10/07 82608 1 ,2-Dibromoethane(ED8) <2 ug/1 11/10/07 82608 Chlorobenzene <2 21 (107 %R) 22 (109 %R) (2 RPD) ug/1 11/10/07 82608 

# easter n analytical, inc. www

. eailabs.com Phone: (603) 

### 228-0525 

## 4

# 1~1 LABORATORY REPORT

East e rn Analyt i c a l , Inc. 10#:65924 Batch ID :
Client: Sanborn , H e ad 

### & Asso ci ates , In c. Clien t Designat i on: L o ndonderry Town Garage 12 0 49

. 01 

## QC Report D ate of An a ly s i s 

### Pa ra m ete r Name Blank LCS LC S D u p U ni t s Met h o d
1 , 1 , 1,2-Tetrac h loroeth ane <2 ug/1 1 1/10/07 82608 E thylbenzene < 1 ug/1 1 1/10/07 82608 mp-Xylene < 1 ug/l 1 1 /10/07 82608 o-Xylene < 1 ug/1 1 1 /10/07 82608 Styrene < 1 ug/1 1 1/10/07 82608 Bromof orm <2 ug/1 1 1 / 1 0/07 82608 lsoPropylbenzene < 1 ug/1 11/10/07 8 2 60 8 Bromobenzene <2 ug/1 1 1/10/07 82608 1 ,1 ,2 .2- T etrac h loroethane <2 ug/1 11/10/07 82608 1,2,3

- T richloropropane <2 ug/1 11/10/07 82608 n-Propylbenzene < 1 ug/1 11/10/07 82608 2-Ch l orotoluene <2 ug/1 1 1 /10/07 82608 4-Chloroto l uene <2 ug/1 11/10/07 82608 1 , 3 , 5- Trimethylbenzene <1 ug/1 11/10/07 82608 tert-Butylbenzene < 1 ug/1 1 1/10/07 82608 1,2,4-Trim ethy l benzene < 1 ug/1 11/10/07 82608
sec- 8u tylbenzene <1 u g/1 11/10/07 82608 1 , 3-D i chlorobenze n e < 1 ug/1 1 1 /10/07 82608 p -lsopropyltoluene <1 u g/1 1 1 /10/07 82608 1 A

- Dichlorobenzene < 1 u g/1 11/10/07 82608 1,2

- D i chlorobenzene < 1 ug/1 1 1 /10/07 82608 n-Bu tylbenzene < 1 ug/1 1 1 110107 82608 1 , 2-0ibromo-3

- chlo ropropane <2 ug/1 11/ 1 0/07 82608 1 ,2,4- T r ichlorobenzene < 1 ug/1 11110/07 82608 Hexachlorobu tadiene < 1 ug/1 11/1 0/07 82608 Napht halene <5 u g/1 11/10/07 82608 1,2,3-Trichlorobenzene < 1 ug/1 11/10/07 82608 4-Bromofluorobenzene (surr) 97%R 101 %R 101 %R % Rec 11/10/07 82608 1 , 2-D i c h lo roben z ene-d4 (surr) 102%R 99 % R 100%R % Rec 1 1/10/07 82608



## eastern analytical, inc

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

## 5

# LAB ORA TORY REPORT

Batch 10: Eastern Analytical, Inc. 10# :65924
Client: Sanborn, Head & 

### Associates , Inc. (NH) Client Designation: Londonderry Town Garage 1 

### 2049

. 01

Volatile Organic Compounds QC limits and Narrative Summary

Matrix: Solid RPD Aqueous RPD Units: 

### % % % 

### % E PA Method 82608 82608 Surrogate Recovery 4-Bromofluorobenzene 74-121 86-115 1,2-Dichlorobenzene-04 80-120 80-120

Matrix Spike Recovery 1, 1-Dichloroethene 59-172 30 61-145 20 T richloroethene 62-137 30 71-120 20 Benzene 66-142 30 76-127 20 Toluene 59-139 30 76-125 20 Chlorobenzene 60-133 30 75-130 20

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 l imits. Sample surrogate recover ies 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.



## eastern analytical, inc. www.eailabs.com 

### Phone: (603) 228-0525 

## 6

### Page of __L

SAMPLING DATE/TIME 

### CHAIN-OF-CUSTODY RECORD

B o LD FIELD S R EQUIRED. PLEAS E CIRCLE REQUESTED ANALYSIS

.

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## 65924

# ~**~** 

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RELINQUI SHED BY : DATE : TIHE : REC E IVED BY :
RELINQUI SHED BY : DATE : TIHE : RECEIVED BY : 

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### 8 RCRA 13 PP FE , 

### HN PB , (U

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# .JJ\.Meas!:z

..**~~ ~~=~:** **inc.** 2S CHENEll DRIVE 

# I CONCORD. NH 03301 

# I TE L: 603 .228

. 0525 1 1.800.287.0525 

# I FAX : 6 03 .228.4591 

# I E-MA I L: CUSTO MER_SE I\VICE@EA I LABS .COM 

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.CO M (WHITE : ORIGINAL GREEN : PROJE CT MAN AGER)