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PUBLIC F ALTH SERVI�ES ,aP�� <br /> SAN JOAQUIN COUNTY <br /> a: <br /> ENVIRONMENTAL HEALTH DIVISION . ` <br /> Karen Furst, M.D., M.P.H., Health Officer �... P <br /> E COp FoaN <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95 i <br /> 209/468-3420 <br /> OCCUPANT OCT 2 2 1999 I <br /> 23565 S SANTA FE RD <br /> RIVERBANK CA 95367 <br /> RE: Water Sample Results from well at 23565 S.Santa Fe Rd.,Riverbank <br /> Enclosed please find a copy of the results of the October 7, 1999 groundwater sample analyses performed by <br /> GeoAnalytical Laboratories Inc., from your domestic drinking water well. <br /> San Joaquin County Public Health Services,Environmental Health Division(PHS-EHD)hereby advises you <br /> that the presence of Methyl tertiary-Butyl Ether(MtBE) at 38 micrograms per liter(ug/1)in this initial <br /> sampling exceeds allowable secondary maximum contaminant levels (MCL) for public drinking water systems <br /> as established by the State Department of Health Services (DHS). Private wells,however,are not legally <br /> required to meet these standards. <br /> The secondary MCL for MtBE has been established at 5 ug/l based on the aesthetics of odor. Currently, <br /> DHS is considering adopting a primary MCL for drinking water of 13 ug/1 based on health effects. Pending <br /> a confirmation sampling event to verify the concentration of MtBE in your domestic drinking water well, <br /> PHS-EHD recommends that you do not drink the water or use it in the preparation of meals. <br /> PHS-EHD will require the owner/operator of the underground storage tanks previously located at Ranch <br /> Market,23569 S. Santa Fe Road,to collect and analyze additional groundwater samples from your well. This <br /> will be done to verify and monitor the presence of MtBE in your well. If MtBE continues to be present in <br /> your well,PHS-EHD recommends that you use bottled water for drinking or cooking purposes. Long term <br /> corrective measures would be: <br /> 1. Provide treatment such as "granular activated carbon filtration" which removes <br /> contaminants by passing the well water through a charcoal bed. <br /> 2. Construct a replacement well. A test well would be drilled and water quality analysis <br /> performed prior to final placement of the new well. Certain"grout" conditions apply <br /> for this area. Please consult with a California licensed well driller for details. <br /> If you have any questions,please contact Michael Infuma at(209) 468-3454. <br /> Donna Heran,REHS,Director <br /> Environme t H alth Di n <br /> Michael J. Infurna Jr.,Senior REHS MargaretaL gono,REHS <br /> LOP/Site Mitigation Unit IV Supervisor <br /> c: CVRWQCB-Mark List,Sacramento. <br /> :. Ranch Market 23569 S.Santa Fe Rd.,Riverbank,CA.,95736. <br /> A Division of San Joaquin County Health Care Services <br />