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I <br /> C�e01t Tech'' `ccs lac. <br /> 1 101 Th Street <br /> Mod(209)2e-4119/Fax�(209)522-4227 <br /> Report <br /> is . <br /> Additional Site Characterization <br /> Soil'& Groundwater Investigation <br /> Westley Fuel Service <br /> 4549 Ingram Creek Rd. <br /> Westley, California <br /> Project No. 701.2 <br /> July 24, 2002 <br /> 1.0 INTRODUCTION <br /> An underground storage tank containing diesel fuel was formerly located on the property — <br /> see Figures 1 & 2. A previous consultant, Wm. J. Hunter & Associates, installed four <br /> groundwater monitoring wells in an effort to determine if diesel fuel had impacted <br /> :. groundwater. Diesel contamination was subsequently detected in groundwater at the site. . <br /> In August 2001, Geological Technics Inc. (GTI) installed three additional monitoring wells <br /> at the site. Two wells, MW-5'and MW-6, were completed as shallow wells screened across <br /> the water table at approximately 60 feet below grade. One well, MW-105, was completed <br /> with a discretely screened interval at approximately 30 feet below the water table. The new <br /> and existing wells have been sampled for four consecutive quarters and laboratory analysis <br /> of groundwater samples indicates the presence of diesel in the deep well. <br /> In our August 20, 2001, "tad Quarter 2001 Groundwater Monitoring" report, GTI <br /> recommended the installations!of two additional deep monitoring wells. The purpose of <br /> these wells was to deterznine,if there is a difference in shallow versus deep groundwater <br /> plume behavior. In their letter of September 6, 2001, the San Joaquin County Public Health <br /> Services/Environmental Health Division (SJC PHS/EHD) directed the submittal of a work <br /> plan to install additional deep-screened monitoring wells. GTI submitted our October 25, <br /> p 2001, work plan and subsequent addendum to meet the requirements of the SJC PHS/EHD <br /> directive. <br /> 2.0 SCOPE OF INVESTIGATION <br /> The existing deep-screened well MW-105 is screened from 90 —95 feet below grade surface <br /> i (bgs). ` The well has contained from <50 to 210 mg/1 Total Extractable Petroleum <br /> Hydrocarbons as Diesel (TEPH-D) during the four sampling events conducted to date. GTI <br /> proposed installing two additional deep-screened wells, MW-104 and MW-106, located <br /> adjacent to the north corner of the site building and adjacent to well. MW-6. The spatial <br /> iy <br /> i� <br /> f <br />