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Eckert Cold Storage Company <br /> 757 Moffat Blvd., Manteca, California September 26, 1994 <br /> Underground Tank Investigation Page: 3 <br /> t - the drilling will-be-halted until-the-responsible professional determines the advisability o _-P <br /> deeper drilling:.) <br /> Upon termination, the boring into the saturated zone will be completed as a monitoring <br /> well and backfilled with concrete grout, after a Bentonite seal has been placed.XThe <br /> b_diing forhe miton <br /> �tonng.weil will be of.a.diameter.at least.four-inches.greater than the <br /> h incl..diamete-'ofthe-WelV asing-to'beuseu'_ .. r <br /> The cuitin s-from-the-drillin {o eration-will-be containerized'on-site dLrin -drillin for <br /> _yo P� dispositian. <br /> The proper method-of d-isposal vjill_be_dependent upon results o f <br /> flaborator_v,analysis-this-disposal will-be-the respc' 'situ t3tc-client.un]ess.other <br /> `7 ... - r <br /> angements-have been made. <br /> 3.2 Well Construction <br /> All materials used in well construction will be:thoroughly cleaned prior to introduction <br /> into the boring. A Bentonite or cement and Bentonite grout will be placed at. the <br /> bottom of the boring as necessary. After the seal has been allowed to set'long enough <br /> to support the weight of the casing, a two inch diameter well casing (stainless steel or <br /> PVC)with end cap and factory perforations for placement in the saturated zone (taking <br /> into account seasonal variation)will be placed in the boring. The screen and filter pack <br /> sizes will be as noted in the well construction drawing. The casing and end caps will be <br /> threaded or joined by stainless steel screws; no PVC cement will be used. The filter <br /> pack will extend two feet above the perforated zone. A Bentonite seal 2 to ?-feet thick <br /> will be placed in the annular space above the filter pack followed by a cement grout to <br /> the surface. Seal and filter pack elevations may change based on the underlying <br /> geology(Figure 5). <br /> 3.3 Well Development and Sampling <br /> The well will be developed until the weli water appears clear of sediment, or until an <br /> appropriate number of well volumes (based upon the judgment of the responsible <br /> professional) have been evacuated. The water produced during well development will <br /> be containerized and left on-site in 55-gallon drums or other suitable containers for <br /> disposal as hazardous waste if deemed necessary upon receipt of laboratory results. <br /> Disposal will be the responsibility of the client unless other arrangements have been <br /> made. The wells will be allowed to stabilize for twenty-four hours prior to sampling. <br /> All soil and groundwater samples will be properly labeled with date collected, project <br /> number, sample coordinator,_ and sample identification. Field records will document <br /> the above information and other significant data, such as names of or--site personnel, <br />