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r <br /> i <br /> traffic rated, water-tight, flush- <br /> mounted well cover <br /> 00 <br /> /\/ \/4 <br /> "-.'—locking <br /> 4 <br /> `.' locking watertight top cap <br /> ! / J <br /> ground surface <br /> \ \ 4 4 \ <br /> . \ \ f4J • \ <br /> f I J f J ! <br /> I 4f` f <br /> 4 4 <br />� ;•f� for <br /> . r l <br /> ! f F <br /> 4 <br /> l l f4f <br /> 4 4 <br /> I f f J <br /> 4 \ <br /> \ 4 <br /> 4 k <br /> cement sanitary seal ! / hush threaded sch. 40 PVC <br /> \ 4 <br /> J;, f4f wellscreen and blank casing <br /> water table / <br /> \ l <br /> f <br /> � \ 1 <br /> / f <br /> f / / <br /> f / <br /> 1 <br /> f <br /> * ♦/ 1f <br /> ' f I <br /> i / f <br />' V <br /> / I <br /> •f \f <br /> 1 l f <br /> \ <br /> / / f <br /> typical 3 inch annulus <br /> 1/2 foot bentonite pellets machine slotted wellscreen <br /> 2 feet in lenqth <br /> washed sand filter pack, I --- flush threaded PVC bottom cap <br /> foot above top of screen <br /> TYPICAL <br /> AIR SPARGING WELL CONSTRUCTION <br /> IN CROSS SECTION <br /> Aqua Science Engineers Figure 5 <br />