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r w • <br /> R(C:9 J V E <br /> ARCADIS BBL 60 0 5 2007 <br /> lnfrastfLrctufe, environrrrent, facrlrtes 1 ARCADIS U.S.,Inc. <br /> ENJikUNMIENtr HEATH 10470 Did Placerville Road <br /> PERMIT/SERVICES suite 110 <br /> Sacramento <br /> Ms.Victoria McCartney California 95827 <br /> Environmental Health Specialist Tel 916.852012416.043.1965 <br /> Fax 9 <br /> San Joaquin County Environmental Health Department Fax <br /> 600 East Main Street <br /> sxom <br /> Stockton, California 95202 <br /> Subject: INDUSTRIAL <br /> Response to Comments -Additional Groundwater Assessment Work Plan <br /> Chevron Service Station 9-2033 <br /> 508 West Charter Way <br /> Stockton., California <br /> Date: <br /> August 31, 2007 <br /> Dear Ms. McCartney: <br /> camad <br /> ARCADIS U.S., Inc. (ARCADIS BBL, formerly known as Blasland, Bouck& Lee, David M Evans <br /> Inc.), on behalf of Chevron Environmental Management Company(Chevron), has PhO11e1 <br /> prepared this letter to address comments to ARCADIS BBL's Additional Groundwater 916.857.0124 x226 <br /> Assessment Work Plan (Work Plan)dated July 12, 2007 provided by the San <br /> C-mail: <br /> Joaquin County Environmental Health Department(County)correspondence dated David.Evans@ <br /> July 26, 2007. The County's comments to the Work Plan are shown below in bold arcadis-us.com <br /> Italics. A response follows each comment below: <br /> Our rer. <br /> What is unclear to EHD is whether the shallow zone wells'objective is to target B0045469.0000 <br /> the `low permeability clay/silt/sand deposits"commonly encountered at <br /> approximately 20 feet bgs or the sand layer commonly encountered at 30 feet <br /> bgs... <br /> The primary purpose of the shallow wells to be installed in the four proposed <br /> monitoring well clusters is to monitor groundwater quality in the first encountered <br /> groundwater at the water table underlying the site. We plan to avoid extending these <br /> well screens into the sand unit commonly encountered at 30 feet below grade, as the <br /> three existing monitoring wells (MW-1, MW-2 and MW-3, screened from <br /> approximately 30 to 50 feet below grade)appear to currently monitor this deeper <br /> groundwater flow zone. <br /> ARCADIS BBL understands the County's concerns regarding the historic low <br /> groundwater levels(up to approximately 33 feet below grade); however,depth to <br /> groundwater at the site has not been greater than 32 feet below grade since <br /> Imagine the result <br /> c.+on nvoam'na.zosmazw_msnzos�a.c�:c m ro,,,mcu.a. <br />