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i <br /> PUBLIC HEALTH SERVIC?S yofN �a <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., .P.H.M , Health Officer <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 209/468-3420 <br /> Mr. Luis Lechich D <br /> Valley Showcase <br /> P.O. Box 881 <br /> Stockton CA 95201-0881 <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 GJW). <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 8266 as the most reliable procedure testing for oxygenates. Based on this letter, <br /> PHS/EHD directed that soil and 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 /> biological oxygen demand and chemical 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 /> P Yg <br /> If you have any questions, feel free to contact Jeffrey Wong at (209) 468-0335. <br /> Donna Heran,RENS,Director <br /> Environmental Health Division <br /> Jeffrey Wong, REHS Margaret Lagorio,REHS <br /> LOP/Site Mitigation Unit IV Supervisor <br /> C: RWQCB, Central Valley Region-Mark List UA <br /> c: JJW Geosciences, Inc. - Toni Mayen <br /> A Division of San Joaquin County Health Care Services <br />