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PUBLIC HEALTH SERVICES <br /> SAN JOAQUIN COUNTY ' <br /> ENVIRONMENTAL HEALTH DIVISION or <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> 304 East Weber Avenue, Third Floor• Stockton, CA 9520 <br /> 209/468-3420 fILE C <br /> MICHAEL TURBETTI / JAN THOMPSON <br /> WILBUR ELLIS COMPANY .JUN 2 3 1998 <br /> 191 W SHAW AVE SUITE 107 <br /> FRESNO CA 93704-2876 <br /> RE: Former Underground Storage Tank SITE CODE: 507797 <br /> 212 Industrial Blvd. <br /> Stockton, CA., 95206 <br /> San Joaquin County Public Health Services, Environmental Health Division <br /> (PHS-EHD) has reviewed the June 9, 1998 "Workplan / Health & Safety Plan - <br /> Additional Subsurface Soil and Groundwater Assessment" submitted by Krazan <br /> & Associates on June 15, 1998 and has the following comments. <br /> San Joaquin County Flood Control District records indicate the greatest depth to <br /> groundwater (drought) in this area during this underground storage tank's (UST) <br /> operation was in Fall 1978. In order to verify that the unauthorized release from <br /> the UST has not impacted soil at this depth, PHS-EHD will require soil samples <br /> to be collected from 60 feet below the ground surface ('bgs). If soil <br /> contamination is found at 60' bgs, vertical investigation must continue until two <br /> consecutively collected and analyzed five foot soil samples verify that detectable <br /> concentrations of petroleum hydrocarbons are no longer present. Krazan's <br /> "Phase One" proposal should be modified to include consecutive five foot soil <br /> samples to at least 60' bgs before PHS-EHD can approve the workplan. <br /> The "Phase Two" proposal to place three (3) monitoring wells eighty to one <br /> hundred feet away from the UST pit may place the wells too far from the source <br /> of contamination. Wells placed far from the source which reveal non detectable <br /> petroleum constituents can only show that the size of the groundwater plume is <br /> smaller than the area between the monitoring wells. PHS-EHD recommends <br /> that the placement of the required monitoring wells be based on field and <br /> laboratory data collected from the push-point/ soil and groundwater sampling in <br /> "Phase One" and be placed as close to the "zero-line" of the groundwater <br /> contamination as possible so an accurate assessment of the extent of the plume <br /> can be made. <br /> The successful collection of saturated soil samples can be optimized if special <br /> equipment is used. Please ensure that the drilling crew is prepared and has the <br /> equipment necessary to successfully collect and preserve the soil samples <br /> collected from soils that may be sandy and water-saturated. <br /> A Division of San Joaquin Counry Health Care Services <br />