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2. Vapor Extraction Wells: Two(2) inch diameter,schedule 40 PVC,flush <br /> threaded. <br /> B. Well Screen: <br /> 1. Dual Phase Extraction Wells: Four(4) inch diameter,schedule 40 PVC <br /> well screen,flush threaded,0.020 inch slot, as indicated. <br /> 2. Vapor Extraction Wells: Two(2) inch diameter,schedule 40 PVC well <br /> screen,flush threaded,0.020 inch slot,as indicated. <br /> C. Bentonite Seal: Shall consist of a mixture of 3/8 inch diameter bentonite chips <br /> and potable water. <br /> 1. Bentonite chips and potable water shall be added in lifts not to exceed 1 <br /> foot thickness following hydration of bentonite chips. <br /> 2. Following placement of each lift,and prior to initiation of the hydration <br /> period,each lift shall be tamped in place around the well casing. <br /> 3. Each lift shall be allowed to hydrate for a period of 15 minutes prior to <br /> placement of successive lifts. <br /> D. Sand Pack: Extraction Well: Colorado silica sand,size 8/12. <br /> 2.2 SURFACE COMPLETION NtATERIAIS <br /> A. Materials <br /> 1. Vault: Reinforced precast concrete. <br /> 2. Lid and Frame: Adjustable torsion covers construction rated for H- <br /> 20 loading, machined flat bearing surface,spring assist lid design. <br /> B. Clear Inside Dimension <br /> 1. Dual Phase Extraction Well: 24-inches width by 36-inches long by <br /> 18-inches deep. <br /> 2. Vapor Extraction Well: : 24-inches width by 36-inches long by 18- <br /> inches deep. <br /> PART 3 EXECUTION <br /> 3.1 PREPARATION <br /> A. Survev well locations+;-0.1 foot lateral,0.01 foot vertical. <br /> B. Protect structures near the well from damage. <br /> 3.2 DRILLING <br /> 02671-2 ERM 10/98 <br />