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PUBLIC `HEALTH SERVICES PpUlly <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION y <br /> Ernest M. Fujimoto, M.D., M.P.H., Acting Health Officer <br /> 304 E.Weber Ave., 3rd Floor • P. O. Box 388 • Stockton, CA 95201-0388 meq•..• �P <br /> 209/468-3420 <br /> 1 <br /> scoTT Hoo-roN <br /> BP OIL COMPANY MAILED NOV 0 91995 <br /> 295 SW 41 ST ST <br /> BUILDING 13, SUITE N <br /> RENTON, WASHINGTON 98005-4931 <br /> RE: BP SITE #11195 SITE CODE: 1554 <br /> 16500 SOUTH 1-5 <br /> LATHROP CA <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has completed <br /> a review of the file for the above noted site and has the following comments for your consideration. <br /> In a telephone conversation with PHS/EHD on March 16, 1995, you stated that you may propose a <br /> modified groundwater sampling plan for this site. Also, in that conversation you stated that you may <br /> propose interim groundwater pumping from site wells at the time of future sampling activities in an <br /> attempt to reduce groundwater contaminant concentrations at the site. In the next quarterly report, <br /> please provide PHS/EHD clarification of your plan of action regarding the assessment and <br /> cleanup for this site. Also, please identify a point in time when the approach you propose will <br /> be evaluated for the overall effectiveness of reducing the levels of contamination evidenced in <br /> the groundwater at the site. <br /> In future quarterly reports, in addition to the tabulated form of reporting, please also provide the site <br /> data in the following format: <br /> * a graph of groundwater elevation data over time <br /> * a graph of groundwater contaminant concentrations over time (you may also graph <br /> dissolved oxygen over time) <br /> * a graph of groundwater contaminant mass over time <br /> Information provided in this format will better document cleanup efficiency over time and demonstrate <br /> any trends in the groundwater contaminant plume at the site. <br /> If you have any questions or wish to discuss this letter in more detail, please contact Linda Turkatte, <br /> Senior REHS, at (209) 468-3441. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Linda A. Turkatte, Senior REHS Diane M. Hinson, REHS <br /> Site Mitigation Unit Supervisor <br /> c: CVRWQCB, Beth Thayer <br /> c: Alisto Engineering, Brady Nagle <br /> A Division of San Joaquin County Health Care Services <br />