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r rc ����� I'�L�c) <br />JUL 1 .1 L007 <br />PO <br />ARCADIS BBL EfRI011T1 tu;lHERSrH <br />' Infrastructure, environment facilities ARCADIS U.S., Inc. <br />10470 Old Placerville Road <br />Suite 110 <br />' Sacramento <br />Ms. Victoria McCartney California 95827Tel slsss7.o124 <br />Fax Environmental Health Specialist 91 .857.1 24 <br />65 <br />San Joaquin County Environmental Health Department w .amadis-us.cam <br />600 East Main Street <br />Stockton, California 95202 r� ,I` (�f-� 7/ / 710? <br />Subject: INDUSTRIAL <br />Additional Groundwater Assessment Work Plan <br />' Chevron Service Station 9-2033 <br />508 West Charter Way <br />Stockton, California <br />Dale: <br />July 12, 2007 <br />Dear Ms. McCartney: Contact <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), 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 />t 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 />GDIV111WCAA&2033_W371110] WorkPhn.doc <br />