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PUBLIC FTEALTH SERVICES <br /> �o <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer L <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 L,� I It Foca <br /> 209/468-3420 <br /> JUL 2 81997 <br /> DAVID AND PAMELA WARMAN <br /> 2468 COUNTRY CLUB BLVD <br /> STOCKTON CA 95204 <br /> Re: Shell Service Station Site Code: 1070 <br /> 2575 Country Club Blvd <br /> Stockton CA 95204 <br /> San Joaquin County Public Health Services,Environmental Health Division(PHS/EHD) has recently <br /> received faxed copies of the laboratory report on the water sample collected from your well and has <br /> prepared a summary of the results of the July 16, 1997 sampling event. <br /> Sample ID I Date Collected MTBE (8020/8260) BTEX TPH-gasoline <br /> #1-bailer of well 7/16/97 5.9 ppb/8.1 ppb <0.5 ppb <50.0 ppb <br /> #2-faucet 7/16/97 <2.5 ppb <0.5 ppb <50.0 ppb <br /> Note: MTBE-Methyl Tertiary Butyl Ether(EPA Method 8020:GC-PID/EPA Method 8260:GC/MS) <br /> BTEX-Benzene,Toluene,Ethylbenzene,and Xylene <br /> ppb-parts per billion-µg/l <br /> Currently,the State of California Department of Health Services Office of Drinking Water has <br /> established an interim action level of 35 parts per billions(ppb)and the United States Environmental <br /> Protection Agency has established a draft standard of 70 ppb as a drinking water standard for public <br /> water systems for methyl tertiary butyl ether(MTBE). However,taste and odor thresholds have been <br /> reported at 15 -45 ppb. Information is still being evaluated to determine final standards regarding the <br /> establishment of human health maximum contaminant levels. Information regarding MTBE's effects on <br /> plant life has not been widely distributed, if it is available. <br /> PHS/EHD has directed Shell Oil to confirm these results and to include your well in their quarterly <br /> sampling program, if you grant permission. Please contact Mary Meays at(209)468-0337, if you have <br /> any questions. <br /> Thank you for your cooperation. <br /> Donna Heran, Director,REHS <br /> �Environmental Health Division <br /> Mary Meays, Senior REHS Mazgaret' agil orio, REHS' <br /> Site Mitigation Unit Supervisor <br /> cc: Elizabeth Thayer, CVRWQCB cc: Steve Gutierrez, SJC Supervisor <br /> cc: Alex Perez, Shell Oil Company cc: Joe Neeley,Enviros <br /> A Division of San Joaquin County Health Care Services <br />