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i <br /> I, <br /> l <br /> traffic rated, water-tight, flush- <br /> mounted well cover <br /> Locking watertight top cap <br /> ' r / r <br /> ground surface <br /> 11 f I l <br /> r ! r ! <br /> r ! F f <br /> l \ <br /> J r ! <br /> \ <br /> cement sanitary seal •`! <br /> flush threaded sch. 40 PVC <br /> wellscreen and blank casing <br /> k \ <br /> 0.5-2 feet bentonite pellets <br /> washed sand filter- pack, 1 to;2 <br /> feet above top of screen <br /> =_= machine slotted wellscreen <br /> typical 3 inch annulus <br /> ME <br /> -- flush threaded PVC bottom cap <br /> TYPICAL <br /> VAPOR EXTRACTION WELL <br /> CONSTRUCTION IN CROSS SECTION <br /> Aqua Science Engineers Figure 6 <br />