Technical Memorandum No 3 Revised Field Investigation Program

Holton Circle RIFS EPA Contract No 68-W9-0036

Work Assignment Nb 04-1LA4 August 23 1990

Metcalf amp Eddy baa prepared Technical Memorandum No 3 to revise the scope of services for the field investigation prograa for the Holton Circle RIFS baaed upon EPA comments detailed in a letter dated July 24 1990 and discussions with Dick Willey on Technical Memorandum No 2

A total of five residential vella and the deep town garage vall had the pumps removed and a downhole geophysical survey performed by the US Geoloaical Survey and observed by a Metcalf amp Eddy geologist during the last week of July 1990

The location and extent of the seismic refraction and VLF geophysical survey vera reduced and the depth of one of the bedrock monitoring vella located between the town garaae and Bolton Circle will be advanced to correspond to the deepest Holton Circle residential well

Bicarbonate vas added to the analytical parameters for aroundwater and metal analysis vas modified to include both filtered and unfiltered samples

The following sections are presented to replace the correapondinamp sections in Technical Memorandum No 2 which modified the Phase II Scope of Work of the February 16 1990 Work Plan submittal

3 3 3 3 Surface Geophysical Suneya The follovina surface geophysical aurveya will be conducted in the town iarage area and between the town aaraae and Holton Circle middot

KlanatQieter surveys will be conducted to locate buried drums at the following locations See Attachment 1 for area locations

bull Military dump area (Area 2) bull Area of fill where salt pile vas formerly located (Area 1) bull Pond area (Area 3)

The anticipated area for the magnetOeter survey is 30000 square feet at a typical spacinamp of 1~ feet on center

Ground Penetratina Radar (CPl) surveys will be conducted to verify magnetoaeter data and possibly deteraine the depth of fill CPl will be conducted in areas where IH survey techniques are not recoaended due to expected hiah salt concentrations See Attachment 1 for area locations

bull Military dump area (Area 2) bull Area of fill where salt pile vaa formerly located (Area 1) bull Radio Beacon Area (Area 4)

The anticipated area for the GPI survey is 40000 square feet at a typical apactna of 25 feet on center

I I I I

Electromagnetic surveys (EK) will be conducted to verify magnetometer GPR data and to delineate a possible salt plume migrating to the northeast of the site See Attachment 1 for area locations

Pond Area (Area 3) Radio Beacon Area (Area 4) Northeast of site in dead tree area (Area 5)

The anticipated area for the EK survey ia 55000 square feet with a typical spacing of 125 feet on center

Seismic Refraction Surveys will be conducted to determine the depth to bedrock bedrock topography and location of possible fracture zones The location of the proposed aeiaaic refraction survey linea are shown in Attacbaent 2 All aeiaaic refraction survey linea will be made perpendicular to the strike of the primary orientation of foliation in the bedrock which 1a approdaately N50bull Thia delineation vas obtained from examining fracture trace analysis reports (BCI Geonetica 1986 NUS 1986 EPIC 1989) and by obtaining measurements of the bedrock outcrop at the end of Isabella Drive A total of 3400 feet of aeiaaic refraction survey linea are shown in Attachment 2 If the seismic refraction and VLF profiling reveals anouloua features indicating bedrock valleys or fracture zones additional shorter linea may be added between the original linea shown in Attachment No 2 Approximately 1600 feet of additional aeiaaic refraction survey linea have been added to the budget as a contingency

VLl Suryeya will be conducted to verify seismic refraction survey data and to identify actual fracture zones in the area between the town garage and Holton Circle and the eastern portion of the town garage property The location of the proposed VLF survey linea are ahovn on revised Attachment 2 A total of 5000 feet of VLF survey linea which includes 1600 feet of additional linea aa a contingency are proposed

3 3 3 4 lloaitoriDamp Vell and Pieaaeter IDatallaUoa Teat Pita and SoU loriDabull Attachment 3 ahova the proposed locations of monitoring vella to be installed In addition teat pita and aoila borings will abo be excavated or drilled All field investigation installations will be conducted under the supervision of an Hamp geologiat Installation procedures are docuaented in Section 6 0 of the IIamp SOP Monitoring well specificationamp are provided in Table 3-1 bull

33341 Orburden Vella Seven monitoring vella will be installed within overburden soils and will be advanced to bedrock using 4-14 inch hollow atea augers A split spoon sampler will be driven at intervals of 5 feet ahead of the augers and headapace analyses performed on each of the aaaplea If any contaaination ia detected the RPK will be notified If necessary continuous aaapling will be performed until signa of contaalnation are no longer evident Analytical aaapling of aoila in the overburden vella ia diacuaaed in Section 33361 Each overburden well will be paired with a bedrock monitoring well

The vella will be constructed of 2-inch ID Schedule 40 PVC and will be installed according to apaclficationa in IIamp SOP Section 60 A screen length of 10 feet will be set just above the top of the bedrock surface OVerburden well depths are anticipated to ranae froa 30 to 35 feet

Aa the borings are installed the cuttingamp vlll be screened vltb an Bnu uaina headapace analyala The augera downhole equipment and ria will be ateaa cleaned before mobilization to the nezt hole

For pricing purpoaea HampE aaaumea that no druma will be generated

Decontamination and well development water vlll be dlapoaed of by infiltration into ahallov trenchea adjacent to the boreholeamp

33342 Bedrock Vella A total of alz aonltorlna vella will be inatalled a mlnlmwa of 150 feet into bedrock vlth a total depth dependent on the overburden thlckneaa The vella vlll be approiidAately 185 feet deep which correaponda to the depth of the ahalloweat contaalnated Bolton Circle residential well A total of five well installation recorda vera available froa Bolton Circle reaidencea The depths of theae vella were 125 185 205 305 and 385 feet deep Of tbeae five vella only the ahalloweat well baa been deterained to not be contaalnated by the NHDES One bedrock well will be advanced 350 feet into bedrock to approximate the deepeat residential vall

Four bedrock lllOilltorlna vella vlll be single open hole vella The three remainlna vella rill be 11Ult1-level vella screened in tranaaiaalve fracture aonea determined by borehole aeopbyalcal louinamp techniqueamp The aultllevel vella will be alted in fracture aonea deteralned froa the surface aeopbyaical aurveya and vlll be located between Bolton Circle and the town aaraae

The final location msaber and depth of aonltortna vella vlll be deterained baaed upon interpretation of the realdentlal and town aaraabull downhole aeophyalcal louinamp performed by the USOS and the aurface aeophyalcal reaulta

The aeven bedrock onltorlna vella vlll be drilled ualna air rotary techniqueamp An 8-lnch dlaaeter borehole vlll be advanced throuamph the overburden and 5 feet into c011petent bed~ock (IQD areater than 90) A peraanent 6-inch dlaaeter flub joint caaina vlll then be lowered to the bottoa of the borehole The 6-inch caatna will be withdrawn 1 to 2 feet while a Portland cnt-bentonlte arout 1a treated into the bottoa 10-feet of the bole to fora a aea1 between the overburden and bedrock The caatna will then be lowered into the arout and allowed to aet a ainlaua of 24 houra before rock cortna 1a besun

The vella vlll be advanced further by Rl rock corlnamp throalh the arout 1n the caalnamp to bedrock It 1a eatiaated that between 10 to 20 feet of bedrock will be cored at each well Bedrock will be drilled ualnamp a downhole huMr and air rotary drllllna techniqueamp to create a 4-inch borehole to a alnlaua depth of 150 feet into bedrock except for KV-6D which vlll be acmanced to a depth of 350 feet into bedrock

The four bedrock vella KV-lD IIV-2D KV-3D and IIV-5D at tba town aaraae will be c011pleted a a open bolea The raaainlnamp three bedrock oaltoriq vella lllfshy4D W-6D and IIV-7D vlll be inatalled ea aultlple screened vella lacb borehole vlll be advanced by lnatalllnamp 6-inch fluab jointed caalnamp down to bedrock

The boreholes drilled for JfoDltorlnamp Vella KVmiddot4D 6D and 7D rill be ampeopbJalcally loged (SectiOD 3335) prior to well lnatallatlOD and a uzs- of flve fracture aonea within the borehole will be screened uaina a Waterloo aulti- level aroundvater ~tCmitOrlna ayataa aa aanufactured by 8ollnU Canada Jtd The IJit

uaea a casing string made up of water activated packers stainless steel port modules various casing lengths a base plug and a surface manifold The ayatea to be installed in the three multi-level vella will contain dedicated pumps for sampling and pressure transducers for monitoring water levels The Waterloo system will be installed by a Solinat senior technician MampE will provide a geologist to observe and assist with the installation

Drilling fluids and muds generated during the installation of bedrock monitoring vella will be screened using headapace analysis with the Hnu Materials will be drummed and disposed of at the direction of NHDES Por pricing purposes it ia assumed that no drums will be generated Pluida and muds will be disposed of by infilt~ation into shallow trenches at a location selected by EPA and the NBDBS

3 3 3 5 Donhole aD4 Ceophyalcal LoampampIDa Three bedrock IDODitoring vella KVshy4D MV-6D and KV-7D will each be loued usina borehole aeophyalca It is anticipated that transmissive fracture aonea in the bedrock will be evident from the data Downhole geophysical logaina will be performed by the uses

In addition five contaminated residential bedrock vella and the deep town aarage well were loaamped using downhole geophysics by the uses The residential vella logged are located at 15 Bolton Circle (Lot No 14-8) 25 Bolton Circle (Lot 14shy22) two vella at 27 Bolton Circle (Lot No 14-24) and 40 Bolton Circle (Lot No 14-27) Metcalf amp lddy arranged to have ita drillina subcontractor remove the pwapa froa the residential vella prior to the geophysical louing and reinstall the puapa upon completion

Borehole geophysical techniques will include teaperature caliper fluid resistivity acoustic televiewer acoustic velocity gamma focussed resistivity 0 and self-potential logs

Well Nwpber

MV-18 2S

MV-lD 2D

MV-38 4S 5S

MV-3D 4D 5D

MVshy 68

MVshy 6D

78

MV-7D

Table 3-1

Proposed Hoaitor1ng Well Specificationa

Projected Poration Depth crtgt

Overburden 35

Bedrock 185

Overburden 35

Bedrock 185

OYerburden 35

Bedrock 385

Bedrock 185

Siting Rationale

Monitor groundwater quality in the surficial aquifer in the western part of the town garage in the ladio Beacon area

Monitor groundwater quality in the bedrock aquifer on the western part of the town garage in Radio Beacon area

Monitor groundwater quality in surficial aquifer in the eastern part of the town garage in the Military Dump area

Monitor groundwater quality in bedrock aquifer in the easter part of the town garage in the Military Dump area MV-4D to have downhole geophyalcal logging and Sollnst WateflOO multi-level well systaa installed

Monitor groundwater quality between the town garage and Holton Circle

Monitor groundwater quality in bedrock aquifer between town garage and Holton Circle Tbla well approzimatea the deepeat residential well MV-6D to have downhole geophysical logging and Sollnst Waterloo multi-level well systaa inatalled

Monitor groundwater quality in bedrock aquifer between town garage and Bolton Circle MV-7D to have downhole geophyaical logging and 11Ultl-level well uaing the 8olinat Waterloo 8ystea

Bitamp -2 SOIL AJWYBIS BOLffOI CDCLB LOIIDOIIDDIY DV IWIP8IIIU

ADalrtical loriDa (1) Surface (2) Sed~t (3) Trip Bqui~nt r~tu tbod Saaplea SoU ampaple a-plea llaDU llaDU Dupllcatea Total

ctr VolatUea 41 6 6 6 6 80bull KL Ula CLP Wula 48 8 -- 3 3 62 CL lcai-VolatUea CLP

s-1-VolatUea 41 6 -- 3 3 62bull reuoleua llyUocarbou su 41 6 8 -- 3 3 62

CL rutlcUaPCia ctr reaticldea PC3a 1 1 10bull -shy

(1) Up to 4 -plea for aach of the au OftrburcleD 80Ditor1Da ua and up to 4 aaaplea for aach opound aoll boriDga rill be obtatDed laaplea for teatQa rill be aelected beaed upoo color and Yiaaal obaeratioo of diacoloratiOD (atainiDa) of the aoU

(2) 81arfaca aoU -plea to be talreD at deptha of 6 inchea and 2 feet at three locatiODa in araa clovngradient of the old allltuy np araa by the tCND sanabullmiddot

ltgt ledtalt -plea to be tabla at deptha of 6 inchea and 2 feet at tlaua araaa between the town aaraae and Holtoo Circle

0

m10gt3ll 3ALIVUSIHIHltIY 110gtyen38 OIltIYll3fgtYliVfgt HMOJ ---shy

I I I I

Electromagnetic surveys (EK) will be conducted to verify magnetometer GPR data and to delineate a possible salt plume migrating to the northeast of the site See Attachment 1 for area locations

Pond Area (Area 3) Radio Beacon Area (Area 4) Northeast of site in dead tree area (Area 5)

The anticipated area for the EK survey ia 55000 square feet with a typical spacing of 125 feet on center

Seismic Refraction Surveys will be conducted to determine the depth to bedrock bedrock topography and location of possible fracture zones The location of the proposed aeiaaic refraction survey linea are shown in Attacbaent 2 All aeiaaic refraction survey linea will be made perpendicular to the strike of the primary orientation of foliation in the bedrock which 1a approdaately N50bull Thia delineation vas obtained from examining fracture trace analysis reports (BCI Geonetica 1986 NUS 1986 EPIC 1989) and by obtaining measurements of the bedrock outcrop at the end of Isabella Drive A total of 3400 feet of aeiaaic refraction survey linea are shown in Attachment 2 If the seismic refraction and VLF profiling reveals anouloua features indicating bedrock valleys or fracture zones additional shorter linea may be added between the original linea shown in Attachment No 2 Approximately 1600 feet of additional aeiaaic refraction survey linea have been added to the budget as a contingency

VLl Suryeya will be conducted to verify seismic refraction survey data and to identify actual fracture zones in the area between the town garage and Holton Circle and the eastern portion of the town garage property The location of the proposed VLF survey linea are ahovn on revised Attachment 2 A total of 5000 feet of VLF survey linea which includes 1600 feet of additional linea aa a contingency are proposed

3 3 3 4 lloaitoriDamp Vell and Pieaaeter IDatallaUoa Teat Pita and SoU loriDabull Attachment 3 ahova the proposed locations of monitoring vella to be installed In addition teat pita and aoila borings will abo be excavated or drilled All field investigation installations will be conducted under the supervision of an Hamp geologiat Installation procedures are docuaented in Section 6 0 of the IIamp SOP Monitoring well specificationamp are provided in Table 3-1 bull

33341 Orburden Vella Seven monitoring vella will be installed within overburden soils and will be advanced to bedrock using 4-14 inch hollow atea augers A split spoon sampler will be driven at intervals of 5 feet ahead of the augers and headapace analyses performed on each of the aaaplea If any contaaination ia detected the RPK will be notified If necessary continuous aaapling will be performed until signa of contaalnation are no longer evident Analytical aaapling of aoila in the overburden vella ia diacuaaed in Section 33361 Each overburden well will be paired with a bedrock monitoring well

The vella will be constructed of 2-inch ID Schedule 40 PVC and will be installed according to apaclficationa in IIamp SOP Section 60 A screen length of 10 feet will be set just above the top of the bedrock surface OVerburden well depths are anticipated to ranae froa 30 to 35 feet

Aa the borings are installed the cuttingamp vlll be screened vltb an Bnu uaina headapace analyala The augera downhole equipment and ria will be ateaa cleaned before mobilization to the nezt hole

For pricing purpoaea HampE aaaumea that no druma will be generated

Decontamination and well development water vlll be dlapoaed of by infiltration into ahallov trenchea adjacent to the boreholeamp

33342 Bedrock Vella A total of alz aonltorlna vella will be inatalled a mlnlmwa of 150 feet into bedrock vlth a total depth dependent on the overburden thlckneaa The vella vlll be approiidAately 185 feet deep which correaponda to the depth of the ahalloweat contaalnated Bolton Circle residential well A total of five well installation recorda vera available froa Bolton Circle reaidencea The depths of theae vella were 125 185 205 305 and 385 feet deep Of tbeae five vella only the ahalloweat well baa been deterained to not be contaalnated by the NHDES One bedrock well will be advanced 350 feet into bedrock to approximate the deepeat residential vall

Four bedrock lllOilltorlna vella vlll be single open hole vella The three remainlna vella rill be 11Ult1-level vella screened in tranaaiaalve fracture aonea determined by borehole aeopbyalcal louinamp techniqueamp The aultllevel vella will be alted in fracture aonea deteralned froa the surface aeopbyaical aurveya and vlll be located between Bolton Circle and the town aaraae

The final location msaber and depth of aonltortna vella vlll be deterained baaed upon interpretation of the realdentlal and town aaraabull downhole aeophyalcal louinamp performed by the USOS and the aurface aeophyalcal reaulta

The aeven bedrock onltorlna vella vlll be drilled ualna air rotary techniqueamp An 8-lnch dlaaeter borehole vlll be advanced throuamph the overburden and 5 feet into c011petent bed~ock (IQD areater than 90) A peraanent 6-inch dlaaeter flub joint caaina vlll then be lowered to the bottoa of the borehole The 6-inch caatna will be withdrawn 1 to 2 feet while a Portland cnt-bentonlte arout 1a treated into the bottoa 10-feet of the bole to fora a aea1 between the overburden and bedrock The caatna will then be lowered into the arout and allowed to aet a ainlaua of 24 houra before rock cortna 1a besun

The vella vlll be advanced further by Rl rock corlnamp throalh the arout 1n the caalnamp to bedrock It 1a eatiaated that between 10 to 20 feet of bedrock will be cored at each well Bedrock will be drilled ualnamp a downhole huMr and air rotary drllllna techniqueamp to create a 4-inch borehole to a alnlaua depth of 150 feet into bedrock except for KV-6D which vlll be acmanced to a depth of 350 feet into bedrock

The four bedrock vella KV-lD IIV-2D KV-3D and IIV-5D at tba town aaraae will be c011pleted a a open bolea The raaainlnamp three bedrock oaltoriq vella lllfshy4D W-6D and IIV-7D vlll be inatalled ea aultlple screened vella lacb borehole vlll be advanced by lnatalllnamp 6-inch fluab jointed caalnamp down to bedrock

The boreholes drilled for JfoDltorlnamp Vella KVmiddot4D 6D and 7D rill be ampeopbJalcally loged (SectiOD 3335) prior to well lnatallatlOD and a uzs- of flve fracture aonea within the borehole will be screened uaina a Waterloo aulti- level aroundvater ~tCmitOrlna ayataa aa aanufactured by 8ollnU Canada Jtd The IJit

uaea a casing string made up of water activated packers stainless steel port modules various casing lengths a base plug and a surface manifold The ayatea to be installed in the three multi-level vella will contain dedicated pumps for sampling and pressure transducers for monitoring water levels The Waterloo system will be installed by a Solinat senior technician MampE will provide a geologist to observe and assist with the installation

Drilling fluids and muds generated during the installation of bedrock monitoring vella will be screened using headapace analysis with the Hnu Materials will be drummed and disposed of at the direction of NHDES Por pricing purposes it ia assumed that no drums will be generated Pluida and muds will be disposed of by infilt~ation into shallow trenches at a location selected by EPA and the NBDBS

3 3 3 5 Donhole aD4 Ceophyalcal LoampampIDa Three bedrock IDODitoring vella KVshy4D MV-6D and KV-7D will each be loued usina borehole aeophyalca It is anticipated that transmissive fracture aonea in the bedrock will be evident from the data Downhole geophysical logaina will be performed by the uses

In addition five contaminated residential bedrock vella and the deep town aarage well were loaamped using downhole geophysics by the uses The residential vella logged are located at 15 Bolton Circle (Lot No 14-8) 25 Bolton Circle (Lot 14shy22) two vella at 27 Bolton Circle (Lot No 14-24) and 40 Bolton Circle (Lot No 14-27) Metcalf amp lddy arranged to have ita drillina subcontractor remove the pwapa froa the residential vella prior to the geophysical louing and reinstall the puapa upon completion

Borehole geophysical techniques will include teaperature caliper fluid resistivity acoustic televiewer acoustic velocity gamma focussed resistivity 0 and self-potential logs

Well Nwpber

MV-18 2S

MV-lD 2D

MV-38 4S 5S

MV-3D 4D 5D

MVshy 68

MVshy 6D

78

MV-7D

Table 3-1

Proposed Hoaitor1ng Well Specificationa

Projected Poration Depth crtgt

Overburden 35

Bedrock 185

Overburden 35

Bedrock 185

OYerburden 35

Bedrock 385

Bedrock 185

Siting Rationale

Monitor groundwater quality in the surficial aquifer in the western part of the town garage in the ladio Beacon area

Monitor groundwater quality in the bedrock aquifer on the western part of the town garage in Radio Beacon area

Monitor groundwater quality in surficial aquifer in the eastern part of the town garage in the Military Dump area

Monitor groundwater quality in bedrock aquifer in the easter part of the town garage in the Military Dump area MV-4D to have downhole geophyalcal logging and Sollnst WateflOO multi-level well systaa installed

Monitor groundwater quality between the town garage and Holton Circle

Monitor groundwater quality in bedrock aquifer between town garage and Holton Circle Tbla well approzimatea the deepeat residential well MV-6D to have downhole geophysical logging and Sollnst Waterloo multi-level well systaa inatalled

Monitor groundwater quality in bedrock aquifer between town garage and Bolton Circle MV-7D to have downhole geophyaical logging and 11Ultl-level well uaing the 8olinat Waterloo 8ystea

Bitamp -2 SOIL AJWYBIS BOLffOI CDCLB LOIIDOIIDDIY DV IWIP8IIIU

ADalrtical loriDa (1) Surface (2) Sed~t (3) Trip Bqui~nt r~tu tbod Saaplea SoU ampaple a-plea llaDU llaDU Dupllcatea Total

ctr VolatUea 41 6 6 6 6 80bull KL Ula CLP Wula 48 8 -- 3 3 62 CL lcai-VolatUea CLP

s-1-VolatUea 41 6 -- 3 3 62bull reuoleua llyUocarbou su 41 6 8 -- 3 3 62

CL rutlcUaPCia ctr reaticldea PC3a 1 1 10bull -shy

(1) Up to 4 -plea for aach of the au OftrburcleD 80Ditor1Da ua and up to 4 aaaplea for aach opound aoll boriDga rill be obtatDed laaplea for teatQa rill be aelected beaed upoo color and Yiaaal obaeratioo of diacoloratiOD (atainiDa) of the aoU

(2) 81arfaca aoU -plea to be talreD at deptha of 6 inchea and 2 feet at three locatiODa in araa clovngradient of the old allltuy np araa by the tCND sanabullmiddot

ltgt ledtalt -plea to be tabla at deptha of 6 inchea and 2 feet at tlaua araaa between the town aaraae and Holtoo Circle

0

m10gt3ll 3ALIVUSIHIHltIY 110gtyen38 OIltIYll3fgtYliVfgt HMOJ ---shy

Aa the borings are installed the cuttingamp vlll be screened vltb an Bnu uaina headapace analyala The augera downhole equipment and ria will be ateaa cleaned before mobilization to the nezt hole

For pricing purpoaea HampE aaaumea that no druma will be generated

Decontamination and well development water vlll be dlapoaed of by infiltration into ahallov trenchea adjacent to the boreholeamp

33342 Bedrock Vella A total of alz aonltorlna vella will be inatalled a mlnlmwa of 150 feet into bedrock vlth a total depth dependent on the overburden thlckneaa The vella vlll be approiidAately 185 feet deep which correaponda to the depth of the ahalloweat contaalnated Bolton Circle residential well A total of five well installation recorda vera available froa Bolton Circle reaidencea The depths of theae vella were 125 185 205 305 and 385 feet deep Of tbeae five vella only the ahalloweat well baa been deterained to not be contaalnated by the NHDES One bedrock well will be advanced 350 feet into bedrock to approximate the deepeat residential vall

Four bedrock lllOilltorlna vella vlll be single open hole vella The three remainlna vella rill be 11Ult1-level vella screened in tranaaiaalve fracture aonea determined by borehole aeopbyalcal louinamp techniqueamp The aultllevel vella will be alted in fracture aonea deteralned froa the surface aeopbyaical aurveya and vlll be located between Bolton Circle and the town aaraae

The final location msaber and depth of aonltortna vella vlll be deterained baaed upon interpretation of the realdentlal and town aaraabull downhole aeophyalcal louinamp performed by the USOS and the aurface aeophyalcal reaulta

The aeven bedrock onltorlna vella vlll be drilled ualna air rotary techniqueamp An 8-lnch dlaaeter borehole vlll be advanced throuamph the overburden and 5 feet into c011petent bed~ock (IQD areater than 90) A peraanent 6-inch dlaaeter flub joint caaina vlll then be lowered to the bottoa of the borehole The 6-inch caatna will be withdrawn 1 to 2 feet while a Portland cnt-bentonlte arout 1a treated into the bottoa 10-feet of the bole to fora a aea1 between the overburden and bedrock The caatna will then be lowered into the arout and allowed to aet a ainlaua of 24 houra before rock cortna 1a besun

The vella vlll be advanced further by Rl rock corlnamp throalh the arout 1n the caalnamp to bedrock It 1a eatiaated that between 10 to 20 feet of bedrock will be cored at each well Bedrock will be drilled ualnamp a downhole huMr and air rotary drllllna techniqueamp to create a 4-inch borehole to a alnlaua depth of 150 feet into bedrock except for KV-6D which vlll be acmanced to a depth of 350 feet into bedrock

The four bedrock vella KV-lD IIV-2D KV-3D and IIV-5D at tba town aaraae will be c011pleted a a open bolea The raaainlnamp three bedrock oaltoriq vella lllfshy4D W-6D and IIV-7D vlll be inatalled ea aultlple screened vella lacb borehole vlll be advanced by lnatalllnamp 6-inch fluab jointed caalnamp down to bedrock

The boreholes drilled for JfoDltorlnamp Vella KVmiddot4D 6D and 7D rill be ampeopbJalcally loged (SectiOD 3335) prior to well lnatallatlOD and a uzs- of flve fracture aonea within the borehole will be screened uaina a Waterloo aulti- level aroundvater ~tCmitOrlna ayataa aa aanufactured by 8ollnU Canada Jtd The IJit

uaea a casing string made up of water activated packers stainless steel port modules various casing lengths a base plug and a surface manifold The ayatea to be installed in the three multi-level vella will contain dedicated pumps for sampling and pressure transducers for monitoring water levels The Waterloo system will be installed by a Solinat senior technician MampE will provide a geologist to observe and assist with the installation

Drilling fluids and muds generated during the installation of bedrock monitoring vella will be screened using headapace analysis with the Hnu Materials will be drummed and disposed of at the direction of NHDES Por pricing purposes it ia assumed that no drums will be generated Pluida and muds will be disposed of by infilt~ation into shallow trenches at a location selected by EPA and the NBDBS

3 3 3 5 Donhole aD4 Ceophyalcal LoampampIDa Three bedrock IDODitoring vella KVshy4D MV-6D and KV-7D will each be loued usina borehole aeophyalca It is anticipated that transmissive fracture aonea in the bedrock will be evident from the data Downhole geophysical logaina will be performed by the uses

In addition five contaminated residential bedrock vella and the deep town aarage well were loaamped using downhole geophysics by the uses The residential vella logged are located at 15 Bolton Circle (Lot No 14-8) 25 Bolton Circle (Lot 14shy22) two vella at 27 Bolton Circle (Lot No 14-24) and 40 Bolton Circle (Lot No 14-27) Metcalf amp lddy arranged to have ita drillina subcontractor remove the pwapa froa the residential vella prior to the geophysical louing and reinstall the puapa upon completion

Borehole geophysical techniques will include teaperature caliper fluid resistivity acoustic televiewer acoustic velocity gamma focussed resistivity 0 and self-potential logs

Well Nwpber

MV-18 2S

MV-lD 2D

MV-38 4S 5S

MV-3D 4D 5D

MVshy 68

MVshy 6D

78

MV-7D

Table 3-1

Proposed Hoaitor1ng Well Specificationa

Projected Poration Depth crtgt

Overburden 35

Bedrock 185

Overburden 35

Bedrock 185

OYerburden 35

Bedrock 385

Bedrock 185

Siting Rationale

Monitor groundwater quality in the surficial aquifer in the western part of the town garage in the ladio Beacon area

Monitor groundwater quality in the bedrock aquifer on the western part of the town garage in Radio Beacon area

Monitor groundwater quality in surficial aquifer in the eastern part of the town garage in the Military Dump area

Monitor groundwater quality in bedrock aquifer in the easter part of the town garage in the Military Dump area MV-4D to have downhole geophyalcal logging and Sollnst WateflOO multi-level well systaa installed

Monitor groundwater quality between the town garage and Holton Circle

Monitor groundwater quality in bedrock aquifer between town garage and Holton Circle Tbla well approzimatea the deepeat residential well MV-6D to have downhole geophysical logging and Sollnst Waterloo multi-level well systaa inatalled

Monitor groundwater quality in bedrock aquifer between town garage and Bolton Circle MV-7D to have downhole geophyaical logging and 11Ultl-level well uaing the 8olinat Waterloo 8ystea

Bitamp -2 SOIL AJWYBIS BOLffOI CDCLB LOIIDOIIDDIY DV IWIP8IIIU

ADalrtical loriDa (1) Surface (2) Sed~t (3) Trip Bqui~nt r~tu tbod Saaplea SoU ampaple a-plea llaDU llaDU Dupllcatea Total

ctr VolatUea 41 6 6 6 6 80bull KL Ula CLP Wula 48 8 -- 3 3 62 CL lcai-VolatUea CLP

s-1-VolatUea 41 6 -- 3 3 62bull reuoleua llyUocarbou su 41 6 8 -- 3 3 62

CL rutlcUaPCia ctr reaticldea PC3a 1 1 10bull -shy

(1) Up to 4 -plea for aach of the au OftrburcleD 80Ditor1Da ua and up to 4 aaaplea for aach opound aoll boriDga rill be obtatDed laaplea for teatQa rill be aelected beaed upoo color and Yiaaal obaeratioo of diacoloratiOD (atainiDa) of the aoU

(2) 81arfaca aoU -plea to be talreD at deptha of 6 inchea and 2 feet at three locatiODa in araa clovngradient of the old allltuy np araa by the tCND sanabullmiddot

ltgt ledtalt -plea to be tabla at deptha of 6 inchea and 2 feet at tlaua araaa between the town aaraae and Holtoo Circle

0

m10gt3ll 3ALIVUSIHIHltIY 110gtyen38 OIltIYll3fgtYliVfgt HMOJ ---shy

uaea a casing string made up of water activated packers stainless steel port modules various casing lengths a base plug and a surface manifold The ayatea to be installed in the three multi-level vella will contain dedicated pumps for sampling and pressure transducers for monitoring water levels The Waterloo system will be installed by a Solinat senior technician MampE will provide a geologist to observe and assist with the installation

Drilling fluids and muds generated during the installation of bedrock monitoring vella will be screened using headapace analysis with the Hnu Materials will be drummed and disposed of at the direction of NHDES Por pricing purposes it ia assumed that no drums will be generated Pluida and muds will be disposed of by infilt~ation into shallow trenches at a location selected by EPA and the NBDBS

3 3 3 5 Donhole aD4 Ceophyalcal LoampampIDa Three bedrock IDODitoring vella KVshy4D MV-6D and KV-7D will each be loued usina borehole aeophyalca It is anticipated that transmissive fracture aonea in the bedrock will be evident from the data Downhole geophysical logaina will be performed by the uses

In addition five contaminated residential bedrock vella and the deep town aarage well were loaamped using downhole geophysics by the uses The residential vella logged are located at 15 Bolton Circle (Lot No 14-8) 25 Bolton Circle (Lot 14shy22) two vella at 27 Bolton Circle (Lot No 14-24) and 40 Bolton Circle (Lot No 14-27) Metcalf amp lddy arranged to have ita drillina subcontractor remove the pwapa froa the residential vella prior to the geophysical louing and reinstall the puapa upon completion

Borehole geophysical techniques will include teaperature caliper fluid resistivity acoustic televiewer acoustic velocity gamma focussed resistivity 0 and self-potential logs

Well Nwpber

MV-18 2S

MV-lD 2D

MV-38 4S 5S

MV-3D 4D 5D

MVshy 68

MVshy 6D

78

MV-7D

Table 3-1

Proposed Hoaitor1ng Well Specificationa

Projected Poration Depth crtgt

Overburden 35

Bedrock 185

Overburden 35

Bedrock 185

OYerburden 35

Bedrock 385

Bedrock 185

Siting Rationale

Monitor groundwater quality in the surficial aquifer in the western part of the town garage in the ladio Beacon area

Monitor groundwater quality in the bedrock aquifer on the western part of the town garage in Radio Beacon area

Monitor groundwater quality in surficial aquifer in the eastern part of the town garage in the Military Dump area

Monitor groundwater quality in bedrock aquifer in the easter part of the town garage in the Military Dump area MV-4D to have downhole geophyalcal logging and Sollnst WateflOO multi-level well systaa installed

Monitor groundwater quality between the town garage and Holton Circle

Monitor groundwater quality in bedrock aquifer between town garage and Holton Circle Tbla well approzimatea the deepeat residential well MV-6D to have downhole geophysical logging and Sollnst Waterloo multi-level well systaa inatalled

Monitor groundwater quality in bedrock aquifer between town garage and Bolton Circle MV-7D to have downhole geophyaical logging and 11Ultl-level well uaing the 8olinat Waterloo 8ystea

Bitamp -2 SOIL AJWYBIS BOLffOI CDCLB LOIIDOIIDDIY DV IWIP8IIIU

ADalrtical loriDa (1) Surface (2) Sed~t (3) Trip Bqui~nt r~tu tbod Saaplea SoU ampaple a-plea llaDU llaDU Dupllcatea Total

ctr VolatUea 41 6 6 6 6 80bull KL Ula CLP Wula 48 8 -- 3 3 62 CL lcai-VolatUea CLP

s-1-VolatUea 41 6 -- 3 3 62bull reuoleua llyUocarbou su 41 6 8 -- 3 3 62

CL rutlcUaPCia ctr reaticldea PC3a 1 1 10bull -shy

(1) Up to 4 -plea for aach of the au OftrburcleD 80Ditor1Da ua and up to 4 aaaplea for aach opound aoll boriDga rill be obtatDed laaplea for teatQa rill be aelected beaed upoo color and Yiaaal obaeratioo of diacoloratiOD (atainiDa) of the aoU

(2) 81arfaca aoU -plea to be talreD at deptha of 6 inchea and 2 feet at three locatiODa in araa clovngradient of the old allltuy np araa by the tCND sanabullmiddot

ltgt ledtalt -plea to be tabla at deptha of 6 inchea and 2 feet at tlaua araaa between the town aaraae and Holtoo Circle

0

m10gt3ll 3ALIVUSIHIHltIY 110gtyen38 OIltIYll3fgtYliVfgt HMOJ ---shy

Well Nwpber

MV-18 2S

MV-lD 2D

MV-38 4S 5S

MV-3D 4D 5D

MVshy 68

MVshy 6D

78

MV-7D

Table 3-1

Proposed Hoaitor1ng Well Specificationa

Projected Poration Depth crtgt

Overburden 35

Bedrock 185

Overburden 35

Bedrock 185

OYerburden 35

Bedrock 385

Bedrock 185

Siting Rationale

Monitor groundwater quality in the surficial aquifer in the western part of the town garage in the ladio Beacon area

Monitor groundwater quality in the bedrock aquifer on the western part of the town garage in Radio Beacon area

Monitor groundwater quality in surficial aquifer in the eastern part of the town garage in the Military Dump area

Monitor groundwater quality in bedrock aquifer in the easter part of the town garage in the Military Dump area MV-4D to have downhole geophyalcal logging and Sollnst WateflOO multi-level well systaa installed

Monitor groundwater quality between the town garage and Holton Circle

Monitor groundwater quality in bedrock aquifer between town garage and Holton Circle Tbla well approzimatea the deepeat residential well MV-6D to have downhole geophysical logging and Sollnst Waterloo multi-level well systaa inatalled

Monitor groundwater quality in bedrock aquifer between town garage and Bolton Circle MV-7D to have downhole geophyaical logging and 11Ultl-level well uaing the 8olinat Waterloo 8ystea

Bitamp -2 SOIL AJWYBIS BOLffOI CDCLB LOIIDOIIDDIY DV IWIP8IIIU

ADalrtical loriDa (1) Surface (2) Sed~t (3) Trip Bqui~nt r~tu tbod Saaplea SoU ampaple a-plea llaDU llaDU Dupllcatea Total

ctr VolatUea 41 6 6 6 6 80bull KL Ula CLP Wula 48 8 -- 3 3 62 CL lcai-VolatUea CLP

s-1-VolatUea 41 6 -- 3 3 62bull reuoleua llyUocarbou su 41 6 8 -- 3 3 62

CL rutlcUaPCia ctr reaticldea PC3a 1 1 10bull -shy

(1) Up to 4 -plea for aach of the au OftrburcleD 80Ditor1Da ua and up to 4 aaaplea for aach opound aoll boriDga rill be obtatDed laaplea for teatQa rill be aelected beaed upoo color and Yiaaal obaeratioo of diacoloratiOD (atainiDa) of the aoU

(2) 81arfaca aoU -plea to be talreD at deptha of 6 inchea and 2 feet at three locatiODa in araa clovngradient of the old allltuy np araa by the tCND sanabullmiddot

ltgt ledtalt -plea to be tabla at deptha of 6 inchea and 2 feet at tlaua araaa between the town aaraae and Holtoo Circle

0

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Bitamp -2 SOIL AJWYBIS BOLffOI CDCLB LOIIDOIIDDIY DV IWIP8IIIU

ADalrtical loriDa (1) Surface (2) Sed~t (3) Trip Bqui~nt r~tu tbod Saaplea SoU ampaple a-plea llaDU llaDU Dupllcatea Total

ctr VolatUea 41 6 6 6 6 80bull KL Ula CLP Wula 48 8 -- 3 3 62 CL lcai-VolatUea CLP

s-1-VolatUea 41 6 -- 3 3 62bull reuoleua llyUocarbou su 41 6 8 -- 3 3 62

CL rutlcUaPCia ctr reaticldea PC3a 1 1 10bull -shy

(1) Up to 4 -plea for aach of the au OftrburcleD 80Ditor1Da ua and up to 4 aaaplea for aach opound aoll boriDga rill be obtatDed laaplea for teatQa rill be aelected beaed upoo color and Yiaaal obaeratioo of diacoloratiOD (atainiDa) of the aoU

(2) 81arfaca aoU -plea to be talreD at deptha of 6 inchea and 2 feet at three locatiODa in araa clovngradient of the old allltuy np araa by the tCND sanabullmiddot

ltgt ledtalt -plea to be tabla at deptha of 6 inchea and 2 feet at tlaua araaa between the town aaraae and Holtoo Circle

0

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--

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ADalytlcal raraeter Jlethod

VolatUe OrplliccCaDd (VOC) CLl VolatUea

CI tamp1a CLl Jletala (fUtared f aDfUtered)

CI a-1-VolatUea CLP St-VolatUea

Cblortda amp3253

ltrate amp353 3

hlfate amp3754

Ortaopboapbate amp3651

llcartMIGate 4500 C02D

T-perewn Pleld

pll lleld

COadactlYlcy lleld

OrouDdwater(l) Saaplea

20

40

20

20

20

20

20

20

20

20

20

Sarfa~e Vater (2) Saaplea

2

2

2

2

2

2

2

2

2

2

2

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8

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lqulpMnt I lanka

3

3

3

3

3

3

3

3

Duplicatebull

3

3

3

3

3

3

3

3

Total per Saapling lound (2)

36

48

28

28

28

28

28

28

(1) GroaDclwater Saaplea - Tbree -plea each to be obtala~d froa bedrock wdla Jlr-4D 6D and 7D BIDalbull aaaplea to be obtalaed froa K1l-lD 2D 3D 5D llllalbull -plea to be obtalDed froa onrbarden wella Jlr-18 throaah 78

(2) A total o~ two aaaplq roaaa are propoaed

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0 ATTACHMENT 1 LOCATION OF MAGNETOMETER EM AND GPR SURVEYS TO DE CONDUCTED IN THE HOLTON CIRCLE AREA

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LEGEND Soil BoringTest Pit Area 0 Monllorlng Well Pair Location

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ATTACIIMENT 3 LOCATIONS OF SOIL BORING TEST PITS PIEZOMTERS MONITORINGg WELL PAIRS AND SURFICIAUSHALLOW SOIL SAMPLES

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-a l bull middot bull bull I)~ ~- -

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0 ATTACHMENT 1 LOCATION OF MAGNETOMETER EM AND GPR SURVEYS TO DE CONDUCTED IN THE HOLTON CIRCLE AREA

~awnoop bullIR ~ AJtlllnD OliOgtXll XALLYliJSINIHltIY Ill~ G~ tnp_I( ~ bulltot~U

NOgtWS OIltIYliXfgtYliYfgt NMOJ lilA ~ 0 lUI bullbull thutt UIIU ItA M =301l0N-------middot --- shy

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LEGEND Soil BoringTest Pit Area 0 Monllorlng Well Pair Location

e Piezometer Location 0 SurflclaVShallo~ ~~~ Sapll~g Locat_lon SCALE IN FEET

ATTACIIMENT 3 LOCATIONS OF SOIL BORING TEST PITS PIEZOMTERS MONITORINGg WELL PAIRS AND SURFICIAUSHALLOW SOIL SAMPLES

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ATTACIIMENT 3 LOCATIONS OF SOIL BORING TEST PITS PIEZOMTERS MONITORINGg WELL PAIRS AND SURFICIAUSHALLOW SOIL SAMPLES

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ATTACIIMENT 3 LOCATIONS OF SOIL BORING TEST PITS PIEZOMTERS MONITORINGg WELL PAIRS AND SURFICIAUSHALLOW SOIL SAMPLES

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