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'r <br /> PUBLIC HEALTH SERVICES ,oPR� IN . <br /> SAN JOAQUIN COUNTY Q `°° <br /> f ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D . , M.P.H. , Health OfficerP <br /> i 304 East Weber Avenue, Third Floor • Stockton, CA 95202 do FsaH <br /> 209/468-3420 <br /> PI <br /> CgPY <br /> FLOYD BARNES <br /> 9744 FOUNTAIN VALLEY <br /> STOCKTON CA 95209 DEC 071998 <br /> i <br /> RE : Barnes Trucking <br /> 1817 Fresno Ave <br /> Stockton CA 05206 <br /> San Joaquin County Public Health Services , Environmental Health Division <br /> ( PHS/EHD) has reviewed the "Workplan for Site Investigation " dated November <br /> 18 , 1998 which was prepared by Clearwater Group , Inc. for the above referenced <br /> site and has the following comments for your review and action . <br /> The work plan proposes the installation of three soil borings to further delineate <br /> the lateral extent of petroleum hydrocarbon contamination evidenced at the site. <br /> The soil borings will be converted to groundwater monitoring wells . <br /> PHS/EHD requests, as per the Clearwater Group , Inc. Field Procedures <br /> (Appendix A) , that the proposed soil borings are continuously cored . Continuous <br /> core work was not done during the previous field operation which took place on <br /> September 25, 1997. At that time soil samples were collected every five feet. In <br /> the " Subsurface Investigation Report" prepared by Clearwater Group , Inc. <br /> following the advancemen ofsoifUiorings SI3_- 1 through -6 and the installation <br /> of monitoring wells MW- 1 MW-2 and MW-3 on September 25, 1997 , it was stated <br /> that there was inconsistent correlation of beds between the installed monitoring <br /> wells. A more complete lithologic description can be obtained with continuous <br /> core borings and would be an aid in preparation of subsurface geological cross- <br /> sections that should be prepared . Section 3 . 0 Project Report of the work plan <br /> should be amended to include the requirement of cross-sectional drawings . <br /> As stated in PHS/EHD correspondence dated August 20 , 1998 , the need to <br /> continue analysis for fuel oxygenates can be reevaluated after a confirmation <br /> analysis has been performed by EPA method 8260 . The analysis using EPA <br /> method 8240 performed on the water samples collected during the third quarter <br /> 1998 monitoring event, which took place on September 29, 1998 , was run on <br /> October 9 , 1998 , three days in excess of the holding time for non-preserved <br /> samples. The analysis was also run with elevated detection limits . The detection <br /> limit for methyl tertiary butyl ether should be 1 . 0 ppb . Therefore, the analysis <br /> needs to be repeated . <br /> A Division or San Joaquin County Health Care Services <br />