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- a <br /> i <br /> ra <br /> PHASE 11:YDROGEOI.OGIC INVFS77GATION WORK PIAN <br /> 4491 WEST DURHAM FERRY ROAD <br /> TRACY,CALIFORNIA <br /> ' DELTA PROJECT NO.40-91-732 <br /> i 1.0 MBODUMON <br /> EE rr+ <br /> Delta Environmental Consultants,Inc. (Delta),has been authorized by dols.Stella Ruiz, the owner of the <br /> i properly,to prepare this Phase I Hydrogeologic Investigation Work Pian for the inataIlation of additional <br /> E monitoring wells an site in order to define the areal extent of the dissolved petroleum hydrocarbon plume- <br /> . <br /> The site is located at 4491 West Durham Ferry Road,Tracy,California figure <br /> 1.1 Sonne of Work <br /> 'T+ Delta proposes the following activities to accomplish this objective: <br /> ; r <br /> / Drill three 8-inch-diameter and one 3 1R inch-diameter soil borings to depths of approximately <br /> 30 feet(monitoring wells)and 15 feet(soil borings)and convert two of them to 2-inch-diameter <br /> monitoring wells. <br /> t <br /> r VO <br /> Collect soil samples at 5-foot Intervals with a modified California sampler for classification <br /> according to the Unificd Soil Classification System(USCS). <br /> Screen recon°red.sail samples with a pottablz photoinization detector(PID) for total organic <br /> vapors. <br /> �i Select and submit four soil samples to a state-certified laboratory for chemical analysis using <br /> U.S.Environmental Protection Agency(EPA)Method Sol SOW modified for total petroleum <br /> hydrocarbons(IPI)and benzene,toluene,ethybenzene,and xylenes(BTEX)with a 10-working- <br /> day turnaround <br /> Stockpilc soil cuttings from drilling on visquine and store on site <br /> 1 <br /> XO . Develop each monitoring well and contain all discharge water in 55-gallon drums to be stared <br /> , <br /> j -- --------onsite----- --- ----- -- --- ----- ---—- - ------ - — <br />