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} <br /> Water-tight <br /> traffic box .----� Ground surface <br /> Locking <br /> mechanism Recommended 3 ft minimum <br /> Concrete <br /> I <br /> l <br /> Bentonite and Varies, <br /> recommended}2 ft <br /> Portland Cement <br /> Bentonite pellets 3 ft minimum <br /> 4 in. Sch. 40 <br /> PVC blank casing :::�f Recommended 2 ft minmum <br /> IF <br /> a 4 in. Sch.40 <br /> PVC screen Varies with <br /> depth to water <br /> 51 .:..... <br /> Varies; typically }20 ft <br /> X. <br /> k s Recommended I ft minimum <br /> .Y' <br /> 4 EA ENGINEERING, <br /> SCIENCE.AND <br /> TECHNQL OGY, INC. <br /> Figure 2-_ Representative well construction detail. <br />