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WMF <br /> 1021 <br /> purposes. T%e following procedures will be used for observation yell <br /> installation: <br /> a A ten-Inch diameter borehole will be advanced and same led to the <br /> cpprcpriate depth using hollow stem auger drilling techniques; <br /> o A capped, four-inch diameter Schedule 40 PVC well ocreen <br /> approximately ten feet in length, with 0.020 screen size, will be <br /> placed in the borehole. All will casing materials will be steam <br /> cleaned prior ti installation; <br /> j <br /> o Blank four-WoGA diameter, flush-threaded Schedule 40 PVC will be <br /> installed from the top of tt.e screen to the ground surface. A cap <br /> will be placed on top of the casing; <br /> o A sand peck consisting of washed sand will b" placed in the <br /> annulus of the borehole to a depth of approximately-two feet a.jove <br /> • <br /> the top of the slotted casing; <br /> o A minims one foot thick bentonite seal dill be placed above the <br /> sand.pack; and, <br /> o The remaining annular space'wtll be filled to the ground surface <br /> -,r <br /> with a beneonite/slurry. A Rayer-,type locking Uuminum cap will <br /> be instY,lled to the top of the casing below a Christi box, which <br /> will be grouted In place at the ground surface to complete <br /> installation. <br /> c <br /> 3.2.2 groupd Water_Sa--wline <br /> Four ground water samples, one quality control duplicate field blank, <br /> a travel blank and a rinsate sample will be .:cllecred for-chemical analysis _ <br /> for each round of ground water sampling. Samples will be analyzed for total <br /> petroleum hydrocarbons (TPH) and benzene, tc),uena, xylene and ethylbenzene ; <br /> RHO1.005 5 November 29, 1988 <br /> z <br />