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HLE COPY <br /> PUBLIC HeALTH S ,oPQU �o <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer .,., <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 209/468-3420 <br /> DALE BOYETT <br /> BOYETT PETROLEUM <br /> P O BOX 576277 <br /> MODESTO CA 95357-6277 <br /> WORKPLAN:Work Plan for Lateral Extent of Groundwater Contamination(Addendum)DATED:May 18,2000 <br /> PREPARED BY: WHF Inc. <br /> APPROVED ... ......with Conditions. See Below <br /> DISAPPROVED ' ❑ <br /> ADDENDUM ❑ Submit by: <br /> ADEQUATE AND NECESSARY ELEMENTS OF THE WORKPLAN(H&S 25299.37,subd.(c)(3).): <br /> 4 Monitoring wells to 25'bsg and one CPT boring(one borehole to determine the geology and one right <br /> next to it for sampling purpose)to approximately 50'bsg,analyses of the soil and water samples,and <br /> subsequent quarterly monitoring and sampling are necessary elements of the work plan to assess the lateral <br /> and vertical limits of the MTBE plume in groundwater and the potential migratory preferences based on <br /> geology and groundwater movement at the site. <br /> COMMENTS AND CONDITIONS: <br /> Contingency to install additional wells below the clay layer at 25'to 29'bsg with short discrete screen interval <br /> within a single continuously isotropic hydrogeological layer(based on CPT data) in order to provide repeatable <br /> points of sampling to identify the extent of the groundwater contamination. <br /> Based on field observations,PHS/EHD recommends contingency to advance the initial CPT boring to below 4, <br /> 50'bsg to evaluate the hydrogeological conditions for risk assessment of potential MTBE vertical migration. <br /> Previous conditions discussed in the work plan approval letter dated May 5,2000 remain applicable. <br /> A second work plan addendum in response to this workplan approval letter is not necessary if these conditions <br /> are met. <br /> REASONS FOR DISAPPROVAL OF THE WORKPLAN(H&S 25299.37,subd.(C)(3).): <br /> None <br /> DATED June 9,2000 BY <br /> Cc: CRWQCB,Central Valley Region—Marty Hartzell <br /> Fax: WHF,Inc.—Bill Fox <br /> A Division of San Joaquin County Health Care Services <br /> I <br />