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PUBLIC, <br /> HEALTH SEkVICES <br /> SAN JOAQUIN COUNTY N <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Ernest M. Fujimoto, M.D., M.P.H., Acting Health Officer <br /> 4GIFORa <br /> 445 N. San Joaquin Street a 2. 0. Box <br /> 38 Stockton, CA 95201-0388 <br /> 3420 <br /> C <br /> BRETT HUNTER <br /> ENVIRONMENTAL ENGINEER <br /> CHEVRON USA INC <br /> P O BOX 5004 DEP` 01 1994 <br /> SAN RAMON CA 94583-0804 <br /> RE: Chevron Service Station #9-1918 SITE CODE: 1138 <br /> 45 East Harding Way <br /> Stockton CA 95204 <br /> San Joaquin County Public Health Services Environmental Health Division (PHS/EHD) has <br /> completed review of the following reports: "Quarterly Monitoring and Sampling Activities" <br /> prepared by GTI and dated August 8, 1994; and "Chevron Memorandum" dated October 21, <br /> 1994. PHS/EHD has prepared the following comments for you consideration. <br /> The quarterly report included the results of the July 8, 1994 sampling event. PHS/EHD <br /> questions both the results and the accuracy of this report primarily because PHS/EHD made <br /> repeated attempts to provide an inspection of this sampling event without success and based <br /> on well installation records, MW2R and MW14 should have contained sufficient water to <br /> sample. The Memorandum included a summary of the site history. The Chevron cover letter <br /> dated October 26, 1994 indicated that Chevron felt that no further corrective action was <br /> necessary. <br /> PHS/EHD does not concur that groundwater monitoring is sufficient to satisfy the California <br /> Code of Regulations, Title 23, Division 3, Chapter 16, Section 2725. Furthermore, PHS/EHD <br /> notified Chevron in correspondence dated October 22, 1992, that PHS/EHD did not have <br /> sufficient evidence to indicate that the site had been largely remediated. This evaluation <br /> included the first series of confirmation soil sampling which continued to evidence significant <br /> soil contamination. The second series of confirmation soil sampling which was initiated in <br /> 1993 further delineated the plume of soil and groundwater contamination. However, it should <br /> be noted that PHS/EHD requested that Groundwater Technology include the detection limit on <br /> tables, since the results can be easily misconstrued as not containing benzene when in fact <br /> benzene was simply not detected at the elevated detection limits. <br /> A Division of San Joaquin County Health Care Services <br />