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t-r <br /> _ PHASE I I-IYDRoGEowGIC UWESITGf'Vnom WORK PLAN <br /> 4491 west Durb—Ferry Road,Tracy,Catiromia <br /> Delta Project No.40-91.732 <br /> Page-t <br /> 3 <br /> located northeast of the forn=gasoline underground storage tanks. Monitoring well locations arc:shown <br /> in Figure 2 <br /> Installation of these maaitoring wells will be performed by a state-licensed drilling contractor and supervised. <br /> by a qualified gaol gist under the supervision of a registered geologist. Proposed monitoring well <br /> construction details are shown in Figure 3. <br /> Inslallatian of the rtiart coring wells will iavoive drilling an.8-inch6iameter borehole to a depth of <br /> approximately 30'feet below grcvnd surface,or a minimum Of 10 f6et below the ground water surface,rind <br /> installing 15 feet of 2-inch-diamete.,No.20::IOt,.r_Iyvitry!chloride(PVC)well screen,and 15 feet of flush- <br /> threaded blank PVC casing, annular space surrounding the screened interval wilf'e backfilled with <br /> No.3 Monterey sand to a point approximately 2 feet above the top of the screened interval;a 2400t-thick <br /> bentonite seal will be placed above the sand. The annular space above the bentonite seal will be filled with <br /> a neat cement,and a Aush-mountad wall vaalt will be installed to provide to;ccure well head. <br /> 3.4;lecortamInAtion <br /> All drilling and sampling equipment wi1I be cleaned before each soil boring is drilled using a high-pressure <br /> $team cleaner. The California split-spoon sampler till be cleaned with phosphate-free soap and rinsed with <br /> ,• <br /> ;eater fGIlowing each sample collection. <br /> '.s Sell I-uttlnes <br /> Drill` cuttings from the soil borings will be placed on vfsquine and stored on site Upon receipt, of. the. <br /> - - <br /> 1 chetrtical results of the soil samples collected from the soil borings,final disposal of the soil cuttings will be <br /> deterrttired. <br /> 3,6Monitotitt Wcdl bevels meat <br /> After installation,each monitoring well will be developed using a suctinn-lift pump until the water.'extnteted <br /> -- �s sediment free_ <br /> __N6_ <br /> water.:or chemicals will be introduced into the monitoring wells Buring well - - -- ---------- - <br /> development. All development water will be contained and pIsccd in drums,ani will be stored an site: The <br /> c <br /> disposition of fhe developm_;nt water will be determined based on chemical'results of the ground water <br /> samples. <br /> A <br /> i <br /> {A .. <br /> f.i <br />