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�ro r <br /> CAMBRIA <br /> November 24, 1997 <br /> Mr Ronald Rowe, Senior REHS <br /> San Joaquin County Public Health .Services <br /> Environmental Health Division E14VIFIONMENTRL HF_ALTH p1V1S10N <br /> P O Box 388Weber Ave i.'kid Floor <br /> Stockton, California 95241 304E P O ox 388, Stat ion CA 95201-0388 <br /> Approved <br /> Denied <br /> It. Site Investigation Work Plan Conditions <br /> Shell Service Station <br /> 620 W Charter Way by <br /> Stockton, California Delete � � <br /> WIC 204-7524-4305 � <br /> (, � N <br /> Site Code 1058124 �� (!. <br /> Dear Mr Rowe <br /> m� <br /> /} r� <br /> This Site Investigation Work Plan has been prepaked on behalf of Shell Oil Products Company ` P6 r <br /> by Cambria Environmental Technology, Inc (Cambria) in response to San Joaquin County 1L�` <br />• Public Health Services (SJCPHS) correspondence dated October 14, 1997 �j <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 /> CAMBRIA 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 /> ENVIRONMENTAL wells (MW-8 and MW-9) were installed during March 1990 <br /> TECHNOLOGY,INC Ground water pumping and vapor extraction test data were collected during March 1990 to <br /> obtain hydrogeologic data, hydrocarbon concentration Ievels, and flow parameters for remedial <br /> 270 PERKINS STREET, system design A free product skimming system was installed to collect free product from well <br /> MW-2 in April 1990 <br /> PD Box 259 <br /> Off-site ground water monitoring well MW-10 was installed during July 1991 <br /> S4hoMA, <br /> A soil vapor extraction system was installed and operated continuously from September 1992 to <br /> CA95476 March 1993 and from April 1993 to September 1993 The system has been operated <br /> intermittently (i a "pulsed") since that time <br /> an 935-4856 <br /> FAX(7P 9356649 <br />