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6 0 <br />RDDNDD <br />I' ARCADIS BBL SEP o 5 2007 <br />Infrastructure, environment, facilities ENVIRONMENT HEALTH <br />PERMIT/SERVICES <br />Ms. Victoria McCartney <br />Environmental Health Specialist <br />San Joaquin County Environmental Health Department <br />600 East Main Street <br />Stockton, California 95202 <br />Subjscl: <br />Response to Comments - Additional Groundwater Assessment Work Plan <br />Chevron Service Station 9-2033 <br />508 West Charter Way <br />Stockton. California <br />Dear Ms. McCartney: <br />ARCADIS U.S., Inc. (ARCADIS BBL, formerly known as Blasland, Bouck & Lee, <br />Inc.), on behalf of Chevron Environmental Management Company (Chevron), has <br />prepared this letter to address comments to ARCADIS BBL's Additional Groundwater <br />Assessment Work Plan (Work Plan) dated July 12, 2007 provided by the San <br />Joaquin County Environmental Health Department (County) correspondence dated <br />July 26, 2007. The County's comments to the Work Plan are shown below in bold <br />Italics. A response follows each comment below: <br />What is unclear to EHD is whether the shallow zone wells' objective is to target <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 />G.b IB1)- 719.2e.UW2ex1_007,303 Ftiep ,.m Gommena1. <br />ARCADIS U.S., Inc. <br />10470 Old Placerville Road <br />Su@e 110 <br />Sacramento <br />California 95827 <br />Tel 916.857.0124 <br />Fax 916.843.1965 <br />w .arcaois-us.com <br />INDUSTRIAL <br />Date: <br />August 31, 2007 <br />Contact <br />David M. Evans <br />Phone: <br />916.857.0124 x226 <br />Emelt: <br />David.Evans@ <br />arcadis-us.com <br />Our ref: <br />80045469.0000 <br />