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• <br /> APPENDIX E; UELL .CONSTRUCTION SPECIFICATIONS <br /> ]dells will be drilled or recomoleted using a truck-mounted drill rig <br /> equipped with a hollow-stemmed auger. All drilling equipment will be <br /> steam cleaned before use to prevent cross-contamination. The well <br /> casings will be flush thread jointed PVC. Well screen slots will be <br /> 0.016 - 0.020". All wells will include a cell point and threaded cap. <br /> All PVC materials will be steam cleaned prior to installation. Well <br /> head installation will be below grade with watertight covers. . Locked <br /> steel covers will be installed on the subsurface boxes for access <br /> 4 control . No drilling fluids or additives will be used. <br /> Monitoring wells will be constructed of 4" PVC installed in an a 10" <br /> E boring. Four inch wells are required for sterile microbiological <br /> samplers Pumping wells will be constructed of 4" PVC installed in a <br /> e . <br /> 10" boring. They will have 5' of blank pipe below the bottom of their <br /> y <br /> screen and their annulus will be cemented for the bottom 5 feet. This <br /> will allow complete screening across aquifers and the installation of <br /> pumps. completely below the base. of the hydrological zone to be <br /> controlled. We will leave an unoccupied space below the lowest intake <br /> of the <br /> pumps to allow for sediment accumulation. All well heads will <br /> r be surveyed to establish their location and elevation. <br /> Gravel pack and characteristics will be determined in the field. The <br /> ..... gravel r=ck will extend from the bottom of the .well screen to a <br /> .....mi-nimum-of---ane_foot-above_the-Screen.-----The_-gravel_pack_will b-e-t_opped--- ---- --. r <br /> by six inches of clean sand and two feet of clean bentonite. The <br /> wells will be grouted to the surface with bentonite/cement mix. <br /> r <br /> ME <br /> L .. <br />