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SER ESPUBLICOF <br /> AEALTH �• _ <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH D"ION <br /> Ernest M. Fujimoto, M.D., M.P.H., Acting Health OtIricer <br /> 445 N. San Join Street a P.O. Box 388 a Stockton, CA 95201-0388 <br /> (209) 468-3420 <br /> APR 13 1994 <br /> CHEVRON USA PRODUCTS CO C(DF)y <br /> p O BOX 5004 <br /> SAN RAMON CA 94583 <br /> SITE CODE: 1628 <br /> RE: CHEVRON <br /> 25650 N HWY 99 <br /> ACAMPO CA 95220 <br /> San Joaquin County public Health Services, Environmental Health Division <br /> (PBS/EHD) has recently reviewed the analytical results of the soil and/or <br /> water samples taken from beneath the underground storage tank(s) that were/was <br /> removed from this site on December 15, 1993. <br /> The presence of contaminants at your facility exceed the allowable limits of <br /> leaching potential as recommended by the 1,13 T Manuals. The former underground <br /> storage tank(s) (UST) cannot be recommended for final closure without further <br /> investigation to determine the full extent of the soil and/or groundwater <br /> problem. <br /> PHS/EHD is providing you notification that an "Underground Storage Tank <br /> Unauthorized Release (Leak)/Contaminated Site Report" has been filed pursuant <br /> to Section 25295 of the Health and Safety Code (HSC) . The appropriate <br /> disclosure of a hazardous waste discharge pursuant to Section 25180.7 of the <br /> Health and Safety Code has been made, and the site has been placed on the list <br /> of contaminated sites in San Joaquin County which is maintained by PHS/EHD. <br /> PHS/EHD has been designated by the State of California Water Resources Control <br /> Board (SWRCB) as the local agency overseeing the investigation of leaking <br /> USTs. Pursuant to Section 25299.37 (HSC), "dischargers" must take corrective <br /> action in response to the unauthorized release. <br /> Please be advised that PHS/HHD will be utilizing the SWRCB "Prioritization <br /> System for Leaking Underground Storage Tank Sites" ranking list in order to <br /> prioritize all the contaminated sites. The "Prioritization System" has <br /> established criteria to distinguish between High Priority Sites, Moderate <br /> Priority Sites, and Low Priority Sites. Site specific conditions which <br /> Influence the placement within the ranking system are, for example, depth to <br /> groundwater, proximity to a drinking water source (municipal or domestic <br /> well) , the extent of soil contamination, and the site's clean up funding <br /> availability. <br /> Based upon the priority ranking, you-will be directed to begin the required <br /> investigation. However, given the conditions for the prioritization, wherever <br /> possible PHS/HHD will work with you to coincide enforcement directives in <br /> conjunction with secured clean up funding. If you have any questions, contact <br /> ' the PHS/EHD Site Mitigation Unit for further information at (209) 468-3450. <br /> If your tank removal was recent and you are not planning any remedial <br /> activities within 90 days, the tank excavation should be closed. It has been <br /> our experience that open tank excavations allow for rapid downward migration <br /> of contaminants. Contact the appropriate building department for specific <br /> j requirements that may be necessary prior to filling with pea gravel and/or <br /> i compacting the tank excavation with clean fill soil. <br /> I <br /> A Division of San Joaquin County Health Care Services <br />