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PUBLIC EALTH S ' CES a�,N <br /> �. ,.o <br /> SAN JOAQUIN COUNTY Q• °P• c <br /> ENVIRONMENTAL HEALTH DIVISION t,: -. X <br /> Ernest M. Fujimoto, M. D., M.P.H., Acting Health Officer ' <br /> 304 East Weber Avenue,Third Floor • Stockton, CA 95202 f ;FOR; �P <br /> 2091468-3420 <br /> C (ou <br /> SHELL OIL PRODUCTS COMPANY <br /> ALEX PEREZ <br /> APR 1 <br /> P O BOX 4023 <br /> CONCORD CA 94524 <br /> RE: 620 W CHARTER WAY SITE CODE: 1058124 <br /> STOCKTON CA <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS-EHD) has completed the <br /> review of the quarterly monitoring report for the first quarter of 1997 and offers the following comments for <br /> your consideration. <br /> The data in the report show that the water table has risen over time to encompass almost all of the <br /> screened interval of the site wells. As there is virtually no exposed screen left in the vadose zone, soil <br /> vapor extraction technology would not continue to be efficient at removing hydrocarbons from the <br /> subsurface. Also, decreasing the number of wells being used for vapor extraction.may aid in increasing <br /> hydrocarbon removal rates. <br /> It is unknown at this time if the system has truly reached asymptotic levels or if the decline in efficiency is <br /> related to the rise in the water table at the site. Additional wells, screened for the purpose of increasing <br /> the efficiency of hydrocarbon removal, may be proposed and installed in the core areas of the plume at <br /> this site. Alternatively, the site may continue to be monitored and information demonstrating the.plume to <br /> be stable or declining and of low risk to human'health and the environment may be collected and <br /> submitted to PHS-EHD for review. However, the inefficiency of the soil vapor extraction system at this site <br /> must be addressed in either case. <br /> Please provide an update on the status of the cleanup at this site in the next quarterly report. <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 aTurkatte, Senior REHS Margare agorio, RE <br /> Site Mitigation Unit Supervisor <br /> LT <br /> c: CVRWQCB, Beth Thayer <br /> c: Enviros, Diane Lundquist <br /> A Division of San Joaquin County Health Care Services <br />