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i � <br /> • <br /> 3.5 Air:S12arge Well Installation <br /> Each air sparge well will be constructed using two feet of 2-inch diameter, 0.020-inch-slot PVC well <br /> screen at the bottom of the soil boring, followed by 2-inch diameter blank well casing to ground <br /> surface. A f Iter pack of#3 or equivalent sized sand will be placed in the annular space from"the <br /> bottom of the screened interval to four feet above the screened interval. A sanitary seal of three feet <br /> of hydrated bentonite pellets will be placed above the filter pack and bentonite grout slurry will be <br /> placed from the top of the bentonite slurry to approximately two feet bgs. A traffic rated well box <br /> will then be installed at the surface. Figure 3 shows the details of a typical air sparge well <br /> completion. <br /> 3.6 Well Development <br /> The air sparge wells will be developed using a surge block and bailer to remove fine grained <br /> sediments from the well and sand pack. All development water will be placed in 55-gallon drums, <br /> labeled, and stored on site pending the evaluation of disposal/recycling options. <br /> 3.7 Drill Cuttings and Rinsate Water <br /> All augers, sampling tools, and down hole equipment will be steam cleaned prior-to use. All soil <br /> cuttings and rinsate water generated during the drilling operations will be stored in 55-gallon drums <br /> at the site pending laboratory analysis for evaluating disposal/recycling options. <br /> 3.8 Reporting <br /> SECOR will include the results of the sparge well installation in the quarterly report following this <br /> proposed activity. The report will document field procedures and as-built well construction <br /> specifications. <br /> Loekspar.wp I SECOR <br /> Job No.76005-001-02 June 7.1999 <br /> 4 <br />