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S casing. The screened interval will consist of 0.020-Inch or 0.010-inch slotted casing, placed from 5-10 feet above the depth to water to 10-20 feet below the depth to water, unless an imper- vious clay layer is encountered Well screen will riot be placed across a relatively impermeable soil unit that does not appear to be saturated and may be an aquitard or aquiclude. i A threaded end plug or a slip cap secured with a stainless steel screw will be placed on the bottom of the well, and a locking well cap will secure the top of the well. A gravel pack of Lonestar or equivalent sand of appropriate size will be placed in the annular space around the well screen to approximately 2 feet. above the to u1 A of the screen. A Bentonite Plug 1-2 feet thick will be placed on top of .the sand. pack and E.•.j hydrated with deionized water. The well will then be sealed to -� the surface using neat cement or a cement-Bentonite grout mix. The well will he cam pleL _d on the surface in, a slightly raised concrete Christy box witha *rater-tight .11 steel lid. The well box J will be set in concrete'. The :proposed well completion is shown in Figure B-1 . B.4 WELL DEVELOPMENT 3 The w ells "Wi11 be developed from one to thre e days after instal- lation, defending on local regulations. Development will consist of sur in g g ►he screened interval of the well with a flapper valve r -_-.. surge.-.block tor- approximately i 5 minutes. The well w�l pthen be . purged, with an. air.-lift pum p or by hand bailing, of 2-4 casing . volumes of water.": the?`sur ing g g"and pumpil n procedure will be' repeated .untfl. the water""is`-relatively free° from" apparent .:Sfl.t and',:turbidit-.;' '. r A record of the Purging methods and 'volumes of water purged will t be maintained. All purge .water will be contained on the site in e42/71050/7-90/apb B-3