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11-2d--1997 8 3dPM FROM CAMBRIA SONOMA 7079356649 P 2 <br /> November 24, 1997 <br /> Mr. Ronald Rowe, Senior REHS <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> PO Box 388 <br /> Stockton, California 95201 <br /> RE: Site investigation Work Plan <br /> Shell Service Station <br /> 620 W Charter Way <br /> Stockton, California <br /> WIC 204-7524-4305 <br /> Site Code 1058124 <br /> Dear Mr Rowe <br /> This Site Investigation Work Plan has been prepared on behalf of Shell Oil Products Company <br /> by Cambria Environmental Technology, Inc (Cambria) in response to San Joaquin County <br /> Public Health Services (SJCPHS) correspondence dated October 14, 1997 <br /> Site Background <br /> Site investigation activities were initiated in February 1989 when eight soil borings were drilled <br /> to assess site conditions prior to underground storage tank removal and replacement activities <br /> In November 1989, four underground storage tanks were excavated and removed, and soil <br /> samples were collected from former tank and product line trench excavations <br /> Between December 1989 and January 1990, ground water monitoring wells MW-1 through MW- <br /> CuMUu 7 were installed During this time, underground piping was installed to wells MW-2, MW-3, <br /> MW-4, MW-5, and MW-7 for future remediation Two additional ground water monitoring <br /> UVMONMENrei wells (MW-8 and MW-9) were installed during March 1990 <br /> Iiia =y,b1c Ground water pumping and vapor extraction test data were collected during Manch 1990 to <br /> obtain hydrogeologic data, hydrocarbon Concentration levels, and flow parameters for remedial <br /> 2nrulctrissam system design A free product skimming system was installed to Collect free product from well <br /> MW-2 in April 1990 <br /> Pfl Bou 259 <br /> 4f1'-sitc ground water monitoring well MW-10 was installed during July 1991 <br /> SoNonsA, � <br /> A soil vapor extraction system was installed and operated continuously from September 1992 to <br /> 0.19%76 March 1993 and from April 1993 to September 1993 The system has been operated <br /> intermittently (i a "pulsed") since that time <br /> 1 vMF5t0 <br /> (7D714356644 <br />