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W/ <br /> PUBLIC HEALTH SERVICt-1 W <br /> SAN JOAQUIN COUNTY (,Jv <br /> ENVIRONMENTAL HEALTH DIVISIONKaren Furst, M D , M PH , Health Officer304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 209/468-3420 <br /> Jeff Hopkins <br /> SEP 2 2 2000 <br /> Western 03.1 & Spreading Inc. <br /> PO Box 709 <br /> Martinez, CA 94553 <br /> 1 <br /> Re Westem Oil and Spreading Site Code 1927 <br /> 19256 N Hwy 99 <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 /> groundwater contamination as proposed in Proposal Workplan,Phase II Field Inzatigatwn(the <br /> work plan) dated February 16,2000, prepared by Klemfelder 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 /> tmeeting were you representing the responsible pang, 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 monitoring 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 borings is to defuse the lateral extent of the groundwater contamination <br /> • Contingency to install additional borings to def use the extent of the groundwater <br /> c ontarrunation <br /> 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 Division of San Joaquin County Health Care Services <br />