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PUBLIC HEALTH SERVICES aPP�'h <br /> • SAN JOAQUIN COUNTY °G <br /> r <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D , M.P.H , Health Officer <br /> 304 East Weber Avenue, Third FIoor a Stockton, CA 95202 Ca c,Ce Fto" <br /> 209/468-3420 <br /> UNOCAL CORP FEB 2 0 <br /> BOB BOOST 1998 <br /> 2121 N CALIFORNIA BLVD STE 250 <br /> WALNUT CREEK CA 94596 <br /> RE former Unocal #0123 SITE CODE. 505099 <br /> 1034 Central Ave <br /> Tracy, CA , 9537$ <br /> San Joaquin County Public Health Services, Environmental Health Division <br /> (PHS-EHD) has recently received two phone inquiries concerning future <br /> requirements from PHS-EHD for this site For clarification, the following <br /> recommendations are offered, <br /> The delineation of contamination in the soil and groundwater both laterally and <br /> vertically is required Subsurface data from soil and groundwater samples <br /> should provide information that will allow the site to be assessed for the extent of <br /> contaminated mass, the average concentration of petroleum impacted soil, and a <br /> determination if the soil has completed its "loading" to the groundwater or <br /> whether it can be expected to continue to increase its impact to the groundwater <br /> Identification of all wells within a 2000 foot radius of this site must be completed <br /> Further assessment in the area of the former waste oil tank is needed. Solvent <br /> contamination from the waste oil tank appears to exist in mondonng well #U-3 <br /> and a lateral and vertical plume determination is required Additionally, high <br /> levels of gasoline have bean detected in the newest monitoring well (#U-5) and <br /> further down-gradient investigation is required <br /> Once the site has been fully assessed and feasibility testing completed, a <br /> Corrective Action Plan (CAP) is to be submitted to PHS-EHD that addresses <br /> remedial methods and evaluates at least two attematives for cost-effectiveness <br /> This CAP is to include the costs and time frame estimates needed to return the <br /> groundwater to it's designated "beneficial use", Once approved by PHS-EHD, <br /> the Corrective Action Plan is submitted to the State Water Resources Control <br /> Board (SWRCB), Clean Up Fund (CUF) for pre-approval of costs <br /> Post-rt'"brand fax transmittai memo 767, Nor page:. 2 <br /> TO From <br /> S <br /> Ga <br /> i� Wept Pkane a <br /> F�N Fax a <br /> A owision of San Joa4uln County HCS,Cram Srrv11_es <br /> 100 d 18L� tP6 019 931 3H H1SON IN33 ` VOONR 6Z 60 (3(11186 .91- W <br />