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2. Well Screen: Two(2) inch diameter,schedule 40 PVC,flush threaded, <br /> 0.020 inch slot,as indicated. <br /> 3. Sand Pack: Clean,washed,Colorado silica sand,size 8/12. <br /> 4. Bentonite Seal: Mixture of 3/8 inch diameter bentonite chips and potable <br /> water. <br /> a. Bentonite chips and potable water shall be added in lifts <br /> not to exceed 1 foot thickness following hydration of <br /> bentonite chips. <br /> b. Following placement of each lift,and prior to initiation <br /> of the hydration period,each lift shall be tamped in <br /> place around the well casing. <br /> C. Each lift shall be allowed to hydrate for a period of 15 <br /> . utes prior to placement of successive lifts. <br /> B. Soil Vapor Monitoring Probe: <br /> 1. Casing: Low Density Polyethylene tubing,0.24 inch outer diameter. <br /> 2. Screen: Double woven stainless steel wire screen. Six(6)inch length, <br /> 0.25 inch inner diameter. Screen pore size: 0.0057 inch. <br /> 3. Screen Filter Material: 50 to 100 mesh glass beads. <br /> 4. Bentonite Seal: Bentonite powder and potable water. <br /> a. Bentonite powder and potable water shall be added in lifts not to <br /> exceed 1 foot thickness following hydration of bentonite powder. <br /> b. Each lift shall be allowed to hydrate for a period of 15 minutes <br /> prior to placement of successive lifts. <br /> 2.2 SURFACE COMPLETION MATERIALS <br /> A. Ground Water Piezometer. <br /> 1. Carbon steel standpipe,hot-dipped galvanized,hinged lid,with hasp and <br /> staple for locking with standard padlock. <br /> A. Soil Vapor Monitoring Probe: <br /> 1. Well Box: H-20 traffic rated monitoring well box,water resistant lid. <br /> 2. Lid and Frame: Bolt-down,cast iron lid,machined flat bearing surface, <br /> gasket seal,steel frame. <br /> 02672-2 ERM 10/98 <br />