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PUBLIC HLALTH SERVICES <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION " <br /> Karen Furst, M.D., M.P.H., Health Officer �- <br /> 4 � FORS <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 209/468-3420 <br /> SEP 13 2000 <br /> GARY STALLWORTH LEWIS STALLWORTH <br /> 602 N CALIFORINIA ST 1107 BURKETT AVE <br /> STOCKTON CA 95202 STOCKTON CA 95205 <br /> RE : Stallworth Auto Sales SITE CODE : 2486 <br /> 602 California Street <br /> Stockton CA 95202 <br /> San Joaquin County Public Health Services , Environmental Health Division (PHS/EHD) <br /> has reviewed the "Preliminary Investigation and Evaluation Report" dated August 17 , <br /> 2000 that was submitted by Advanced GeoEnvironmental, Inc. (AGE) on behalf of the <br /> above referenced site and has the following comments. <br /> The report documents site activities , which took place in February and May of 2000, <br /> when three soil borings and five monitoring wells (MW) respectively were installed on <br /> site . Analyses of soil samples collected to date indicate that petroleum hydrocarbon <br /> contamination to soil has occurred at this site and that it has been defined laterally, but it <br /> has not been defined vertically. Analyses of water samples indicate that significant <br /> petroleum hydrocarbon contamination has impacted groundwater and that it has not <br /> been defined vertically. Shallow groundwater contamination may be defined laterally to <br /> the northeast of the source area , by MW-3 . <br /> The installation of the MW's was done under the "Additional Site Assessment Work Plan <br /> Addendum" (Addendum) dated March 10, 2000 . In addition to the monitoring wells, the <br /> Addendum proposed one soil boring to depth in the source area for vertical assessment <br /> of the contaminant plumes. The Addendum was approved by PHS/EHD in <br /> correspondence dated March 16 , 2000 with the condition that this boring be advanced to <br /> a minimum of 70-feet below surface grade (bsg), the historical low water depth in this <br /> area of Stockton. During the May 2000 field activities free-phase product was <br /> encountered while advancing the boring for MWA B. It was decided in the field that the <br /> boring to depth would be postponed so that it could be advanced by a drilling method <br /> other than hollow-stem auger. The concern was in dragging the free-phase product <br /> deeper than it has already traveled . <br /> Please prepare a work plan to continue the investigation of the vertical and lateral extent <br /> of the contaminant plumes at this site. The work plan should include the vertical boring <br /> previously approved . PHS/EHD recommends this boring be advanced by a drilling <br /> and/or sampling method that allows for the collection of depth discrete samples. Once <br /> the vertical extent of the contamination has been determined , in both soil and <br /> groundwater, the lateral extent can be defined . Submit the work plan to PHS/EHD by <br /> October 30, 2000. <br /> A Division of San Joaquin County Health Care Services <br />