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I <br /> Ceotogicd Techlucs Inc. <br /> 2741 River Road <br /> Modesto,California 95351 <br /> (209)538-6424/Fax#538-5852 <br /> i <br /> Work Plan <br /> C <br /> Additional Site Characterization <br /> L <br /> Soil Boring and Monitoring Well Installation <br /> Marci's Property :3: <br /> 2969 Loomis Road , <br /> Stockton, CA V_ <br /> October 25, 2001 <br /> Project No. 770.2 <br /> r 1.0 INTRODUCTION <br /> L <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 has 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 /> r with a discretely screened interval afapproximately 30 feet below the water table. The new <br /> Li 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, "2°d Quarter 2001 Groundwater Monitoring" report, GTI <br /> recommended the installation of two additional deep monitoring wells. The purpose of <br /> these wells is to determine if there is"a difference in shallow versus deep groundwater plume <br /> behavior. In their September 6, -2001 letter,-the San Joaquin County Public Health <br /> Services/Enviromnental Health Division (SJC PHS/EHD) directed the submittal of a work <br /> plan to install additional deep-screened monitoring wells.. The purpose of the following <br /> r work plan is to better define the site conceptual model and meet the requirements of the SJC <br /> L.; PHS/EHD directive. <br /> i <br /> 2.0 PROPOSED INVESTIGATION <br /> The existing deep-screened well MW-105 is screened from 90—95 feet below grade surface <br /> r (bgs). The well has contained <50—.210 mg/1 Total Extractable Petroleum Hydrocarbons as <br /> �+ Diesel (TEPH-D) during the four sampling events conducted to date. Figure 2 includes <br /> r� TEPH-D concentrations from the June 27, 2001 monitoring event. The water table plume <br /> L . <br /> I <br />