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1 • <br /> Geologicaf rTechnWks Inc. <br /> 2741 River Road <br /> Modesto,cafifornva 95351 <br /> (209)5384424/7krx*538-5852 <br /> Vertical Definition Work Plan <br /> 1 <br /> Valentine <br /> (Castle Motors) <br /> 2315 N Eldorado St. <br /> Stockton, CA <br />' Project No 723 2 <br /> August 23, 2000 <br /> 1.0 INTRODUCTION <br />' On October 4, 1999, Geological Technics Inc (GTI) submitted an Additional Site <br /> Characterization Report which documented the installation of a deep, discretely screened <br /> monitoring well and a deeper soil boring at the site (see Figure 1) Analytical data shows the <br /> presence of gasoline range petroleum hydrocarbons in the soil and groundwater to a depth of <br /> at least 110 feet bgs <br /> In a letter dated August 1, 2400, Mr Jeff Wong of SJC PHS/FHD issued a letter directing <br /> that a work plan for the investigation of the vertical definition of the plume be submitted by <br /> August 25, 2000 This work plan addresses that directive <br /> 2.0 PROPOSED INVESTIGATION <br />' The purpose of this investigation is to further define the vertical extent of groundwater <br /> impacts and site lithology To accomplish this goal, GTI proposes to install a single <br /> borehole/well, MW-201, to a targeted depth of 150 feet below grade surface Quarterly <br />' groundwater monitoring of the existing 7 monitoring wells and the new well is proposed for a <br /> one-year period of time <br />' See Figure 2 Site Map for monitoring well locations <br /> 2.1 Borehole Drilling <br />' In an effort to define the vertical extent of the plume, GTI proposes to install a deep, <br /> exploratory borehole to approximately 150 feet below grade The boring will be drilled using <br /> a mud rotary drill rig to combat the heaving sands that were encountered during the drilling <br /> of MW-101 During the drilling of the previous monitoring wells at the site, heaving sands <br /> became a problem starting at 70 feet bgs <br /> i <br /> 1 <br />