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PUBLIC HEALTH SERVICES <br /> SAN JOAQUIN COUNTY r <br /> ENVIRONMENTAL HEALTH DMSION <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 1 <br /> 2091468-3420 <br /> Mr. Luis Lechich C (OPY Valley Showcase <br /> P.O. Box 881 <br /> Stockton CA 95201-0881 DEC 0 11999 <br /> i <br /> RE: Valley Showcase Site Code: 1114 <br /> 913 W. Fremont Street <br /> Stockton CA 95203 <br /> In a telephone conversation on November 22, 1999, your consultant JJW GeoSciences Inc UJW). <br /> requested a letter from San Joaquin County Public Health Services, Environmental Health Division <br /> (PHS/EHD) reiterating the requirement for EPA Method 8260 (8260) for confirmation of Methyl tert- <br /> Butyl Ether (MTBE) and other oxygenates in the analyses of soil and groundwater samples,and testing <br /> of biological oxygen demand and chemical oxygen demand. <br /> In a letter dated July 18, 1997, Central Valley Region Water Quality Control Broad (CVRWQCB) <br /> recommends using 8260 as they <br /> most reliable procedure testing for oxygenates. Based on this letter,. <br /> PHS/EHD directed that soil pd water samples be analyzed and confirmed for oxygenates using 8260 in <br /> a letter dated September 25; 1997. <br /> In the Workplan for Ground-Water Monitoring Well Installation and Continued Quarterly Ground-Water <br /> Sampling(the work plan) dated July 13,.1999 prepared by JJW,the work plan proposed testing for <br /> t biological oxygen demand andchemical oxygen demand to establish a baseline and to evaluate the <br /> effectiveness of the Oxygen Releasing Compound®(ORC) which was introduced in Monitoring Well#{2 <br /> on March 25, 1999. The work plan was approved by PHS/EHD on July 30, 1999. <br /> During the quarterly sampling event on July 15, 1999, in a conversation with the sampler Del-Tech,Inc. <br /> at the above-referenced site,PHS/EHD directed that analyses for all oxygenates in water samples be <br /> stopped since oxygenates do not appear to be a factor at this site based on recent analytical results. <br /> PHS/EHD also repeated this directive to the JJW field"geologist on September 3, 1999 during the <br /> proposed well installation. Please be advised that PHS/EHD is not requiring either soil or water <br /> samples be tested for oxygenates. <br /> If you have any questions, feel free to contact Jeffrey Wong at(209) 468-0335. <br /> Donna Heran, REHS,Director ,. . <br /> Environmental Health Division _ <br /> Jeffrey Wong, REHS Margaret�agorio,R EHS <br /> LOP/Site Mitigation Unit IV Supervisor <br /> c: RWQCB, Central Valley Region—Mark List <br /> c: JJW Geosciences,Inc. —.Toni Mayen <br /> r <br /> iA Division of San Joaquin County Health Care Services <br /> f <br />