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Geosyntec® <br /> consultants <br /> 2.2.1 Pre-Investigation Activities <br /> Prior to.the start of field activities, Geosyntec will perform the following: <br /> • Update the Site health and safety plan; as needed, in accordance with local, <br /> state,and federal requirements; <br /> •. Obtain drilling permits from San Joaquin County,as required for CPTs, MIPs, <br /> and grab groundwater sampling; <br /> • Confirm access and schedule with the property owner; and, <br /> • Notify Underground Service Alert (USA) a minimum of two business days <br /> before any subsurface work and conduct a utility clearance using a private utility <br /> locator to identify subsurface utilities and other potential obstructions. Proposed <br /> investigation locations will be adjusted based upon the USA and private utility <br /> clearance. <br /> 2.2.2 Cone Penetrometer Testing(CPT) <br /> As shown on Figure 4, 12 CPT borings will be advanced across the Site, at locations <br /> upgradient, surrounding, and downgradient of the foriner USTs. The purpose of the <br /> CPT investigation is to provide detailed information on the Site geology. Up to three <br /> additional,provisional CPT borings will be advanced in the vicinity of the former waste <br /> tanks, if groundwater sampling at the CPT nearest the former waste tanks indicates that <br /> concentrations of toluene are substantially different (greater) than the results for <br /> previous samples collected in this area. <br /> Gregg Drilling & Testing, Inc. of Martinez, California, (Gregg) will provide the <br /> equipment and personnel to perform the CPT work. All work will be completed under <br /> supervision of Geosyntec personnel. The CPT probe will be advanced to a minimum <br /> target depth of 40 feet below ground surface (ft bgs). The following parameters will be <br /> measured or detected at 5 cm (0.16 ft) depth intervals at each CPT location: <br /> • Tip resistance(Qt); <br /> • Sleeve friction(Fs); and <br /> • Dynamic pore pressure (Ut). <br /> Final Work Plan.doc 6 27 June 2012 <br />