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7_1 <br /> ✓ <br /> PUBLIC Vcr ALTH SEXVI("tTs <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Oificer <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202- <br /> 209/468-3420 <br /> 52 2091468-3420 COPIT <br /> UNOCAL CORP FEB 2 4 1998 <br /> BOB BOUST <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., 95376 <br /> San Joaquin County Public Health Services, Environmental Health Division <br /> (PHS-EHD) has recently received two phone irj quiries 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 "loa�ing" 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 monitoring well #U-3 <br /> and a lateral and vertical plume determination s required. Additionally, high <br /> levels of gasoline have been 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 alternatives 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"r, Once approved by PHS-EHD, <br /> the Corrective Action Plan is submitted to the State Water Resources Control <br /> Board (SWRCS), Clean Up Fund (CUF) for pry-approval of costs. <br /> A Division of San Joaquin County Health Care Services <br />