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Orion Environmental Inc <br /> IV 3450 E Spring St,Suite zit 562 988-2755 PHONE <br /> . Long Beach,CA 9o8o6 562 988-2759 FAX <br /> I20 February 2001 O Box 455 707 96;-8982 PHONE y Rutherford,CA 94573 707 963-8983 FAX <br /> Project No 11 ST <br /> �� <br /> Mr Harlin Knoll, Senior REHS FES VED <br /> Site Mitigation Unit S 2 Z0 <br /> San Joaquin County Environmental Health Division EVVR p304 East NMENT �1 <br /> Stockton, b95202er Avenue, hird Floor RMITjSERV� C1y <br /> Subject: Letter Report for Groundwater Monitoring, Total Mass Calculations, <br /> iand Site Closure Request <br /> 400 North EI Dorado Avenue, Stockton, California <br /> PIN 127434 <br /> Dear Mr Knoll <br /> Bridgestone/Firestone, Inc (BFS), has retained Orion Environmental Inc (Orion) to <br /> •� conduct groundwater assessment activities at the former BFS facility at 400 North EI <br /> Dorado Avenue in Stockton, California (the site, Figure 1) This document summarizes <br /> the activities conducted in January 2001 to delineate the nature and extent of impacted <br /> groundwater at the site <br /> This report has been prepared in accordance with Orion's Work Plan for Groundwater <br /> Assessment dated 27 October 1999 and the information request facsimile received from <br /> the San Joaquin County Environmental Health Division (SJCEHD), dated 4 January 2001 <br /> The following paragraphs provide a description of the site, regional groundwater issues, <br /> summary of previous investigations, reporting of the fourth round of groundwater <br /> monitoring, total residual hydrocarbon mass, and rationale for site closure <br /> Site Description <br /> The site is the former location of an automobile gasoline station that operated during the <br /> 1920s and 1930s After this period the site was used as a retail tire and automobile <br /> service center In 1967, four underground storage tanks (USTs) were closed in place by <br /> filling the tanks with sand with the approval of the Stockton Fire Department This tank <br /> closure date supersedes the introduction of methyl tert-butyl ether (MTBE) into gasoline <br /> I in California by more than 20 years In 1990, an environmental assessment conducted <br /> by BFS documented that these tanks were not in use and the other USTs located at the <br /> site were not in use because the fill plates were paved over and the vent lines were not <br /> visible on the exterior of the building In 1991 , one of these previously closed tanks was <br /> I S\BFS\STOCKTON\LTR\LTR007 DOC 2/20/01 <br />