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PUBLIC HEALTH SERVICES ,oAQurlyCo <br /> SAN JOAQUIN COUNTY Z g- <br /> ENVIRONMENTAL HEALTH DIVISION ` <br /> Karen Furst, M D , M PH , Health Officer <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 QL'FOR��P <br /> 209/468-3420 <br /> Jeff Hopkins SEP 2 2 2000 <br /> ' Western Cil & Spreading Inc. <br /> PO Box 709 <br /> ' Martinez, CA 94553 <br /> Re Western Ch1 and Spreading Site Code 1927 <br /> 914Hii12 . wy <br /> Acampo, CA 95220 <br /> In a letter dated August 14, 2000,San Joaquin County Public Health Services, <br /> Environmental Health Division (PHS/EHD) agreed to your request to extend the deadline <br /> from August 15, 2000 to October 1, 2000 to implement the work to investigate the <br /> groundv,ater contamination as proposed in Proposal Workplan; Phase II Fred Inustigation(the <br /> work plan) dated February 16, 2000, prepared by Kleinfelder In a telephone conversation <br /> on September 18, 2000, your consultant Dan Barber expressed that the extended-deadline to <br /> implement the work could not be met Dan further expressed that he has questions about <br /> the work plan and requested a meeting with PHS/EHD <br /> A meeting was held at PHS/EHD Conference Room on September 19, 2000 Attending the <br /> meeting were you representing the responsible party, Dan Barber,Jeffrey Wong and Dot <br /> Lofstrom representing PHS/EHD Summaryof the meeting is as follows <br /> ' • PHS/EHD still requires the installation of the morutonrig well as proposed in the work <br /> plan A full seasonal (4 quarters) of sampling is required as a part of the groundwater <br /> contamination investigation <br /> • Modify the scope of the work plan to include 3 additional borings utilizing direct-push <br /> ' technology(Geoprobe) in the vicinity of boring#4 (B-4) The purpose of the three <br /> additional bonngs is to define the lateral extent of the groundwater contamination <br /> ' • Contingency to install additional borings to define the extent of the groundwater <br /> contamination <br /> i One of the Geoprobe bonngs downgradient should extend into the ground water <br /> at approximately 50 feet below surface grade (bsg) to collect a grab groundwater sample <br /> The regional groundwater flow gradient estimated to be north north-east and depth to <br /> water are based on San Joaquin County Flood Control and Water Conservation District <br /> Lines of Equal Depth publication for 1998 and groundwater information of Victor Fine <br /> A Dn:sion of S-in]o-iquin Counts Health Care Ser%ices <br />