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(� s <br /> ARCADIS BBL ,��� � G <br /> ARCADIS U.S.,Inc. <br /> Infrastructure, environment, facilities <br /> 10470 Old Placerville Road <br /> Suite 110 <br /> Sacramento <br /> California 95827 <br /> Ms. Victoria McCartney Te1916.857.0124 <br /> Environmental Health Specialist Fax 916.843.1965 <br /> San Joaquin County Environmental Health Department www.arcadls-us.com <br /> 600 East Main Street <br /> Stockton, California 95202 <br /> INDUSTRIAL <br /> Subject: <br /> Additional Groundwater Assessment Work Plan <br /> Chevron Service Station 9-2033 <br /> 508 West Charter Way <br /> Stockton, California Date: <br /> July 12, 2007 <br /> Dear Ms. McCartney: Contact; <br /> David M. Evans <br /> ARCADIS U.S., Inc. (ARCADIS BBL,formerly known as Blasland, Bouck& Lee, <br /> Inc.), on behalf of Chevron Environmental Management Company(Chevron), Phone: <br /> presents this work plan for additional groundwater assessment for the above- 916.857.0124 x226 <br /> referenced site.The proposed activities consist of the installation of four groundwater <br /> Email: <br /> monitoring well clusters to evaluate the extent of petroleum hydrocarbon impacts to david.evans@ <br /> groundwater downgradient of the former underground storage tank(UST)complex arcadis-us.com <br /> and the dispenser islands/piping.This work plan has been prepared as requested by <br /> the San Joaquin County Environmental Health Department(County), in their letter Our ref: <br /> received on May 10, 2007. A copy of this letter is included as Attachment 1. B0045469 <br /> Site Description <br /> The site is an active service station located at 508 West Charter Way in Stockton, <br /> California(Figure 1).The site facilities currently consist of three gasoline LISTS within <br /> a common excavation near the northwest site boundary,four product dispenser <br /> islands under a common canopy, and a facility building. <br /> Proposed Scope of Work <br /> As summarized in the recent Site Assessment Report(ARCADIS BBL, December <br /> 2006), two distinct water bearing zones(i.e.; sand layers within the low permeability <br /> clay/silt/sand deposits)have been identified underlying the site: a shallow zone <br /> [approximately 20 to 40 feet below ground surface(bgs)]and a deep zone <br /> (approximately 50-60 feet bgs).The predominant groundwater flow direction in the <br /> shallow zone is to the northeast, as presented on the rose diagram(Attachment 2). <br /> Imagine the result <br /> caav rrvwconc2av aoa>•rrrW wwa Pian.dm <br />