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PUBLIC HEALTH SERVIC?S Op4ulN .0 <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> 6q. NSP <br /> 304 East Weber Avenue, Third Floor a Stockton, CA 95202 t FaR <br /> 209/468-3420 CGIr <br /> ROBERT BOUST <br /> UNOCAL—DBG/AMG <br /> 2121 NORTH CALIFORNIA BLVD STE 250 <br /> WALNUT CREEK CA 94596 AUG 2 71999 <br /> RE: Former Unocal #5098 SITE CODE: 2162 <br /> 5606 Pacific Ave. <br /> Stockton,CA., 95207. <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS-EHD) has <br /> reviewed the "Supplemental Environmental Investigation" report dated July 30, 1999 as submitted <br /> by Environmental Resolutions, Inc., on August 3, 1999 and has the following comments. <br /> In November 20, 1998 correspondence, PHS-EHD stated "an evaluation of the site's <br /> assessment is to be included along with a discussion of the remedial alternatives in the <br /> conclusion and recommendation section of the report of findings". This report of findings did <br /> not include a conclusion or recommendation section and there was no professional discussion <br /> concerning this phase of investigation or remedial plans. <br /> You are hereby directed to submit a professional conclusion and recommendation section <br /> addendum to this report that details the findings of this most recent phase of investigation <br /> and discusses UNOCAL's plans for either further investigation or remedial/feasibility <br /> studies. Further investigation and feasibility study plans shall include a detailed time <br /> schedule for all activities associated with the tasks. The addendum is due at PHS-EHD by <br /> October 1, 1999. This is your official notification that this site in not in compliance with <br /> directives issued by PHS-EHD and that you have 90 days from the date of this letter to <br /> come into compliance. Failure to comply with this 90-day notice may result in a request to <br /> the State Water Resources Control Board (SWRCB)Clean Up Fund to remove this site from <br /> eligibility to receive reimbursement funds. <br /> Also missing from this report are site maps showing petroleum concentrations in "iso-concentration <br /> contours" format. PHS-EHD was unable to locate groundwater oxygenate data for MW-19S or <br /> 19D and HP-1 as required by PHS-EHD in the November 20, 1998 directive. Unocal has failed to <br /> comply with directives issued by PHS-EHD. Issues related to "deep" groundwater quality in this <br /> area have been unresolved in the past and this most recent phase of investigation was to supply data <br /> to verify the impact and extent of the contamination from the former underground storage tanks <br /> located at this site. <br /> Soil boring B-2 was placed north of the highest groundwater plume petroleum concentration area <br /> for the purpose of delineating the lateral and vertical extents of the contamination. Although soil <br /> data was available, PHS-EHD was unable to locate groundwater data for B-2 and is concerned that <br /> A Division of San Joaquin County Health Care Services <br />