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� f 1 <br /> traffic rated, water-tight, flush- <br /> mounted well cover <br /> 4 � \ \ <br /> ;•; \,\ locking watertight top cap <br /> ground surface <br /> r . rr r <br /> . J <br /> r / r <br /> t <br /> / f r <br /> J r <br /> r r <br /> 4 ♦ <br /> r r r <br /> r J J <br /> cement sanitary seal `r •`! <br /> ;• /;r flush threaded sch 40 PVC <br /> ;; ,♦; weliscreen and blank casing <br /> \ <br /> water table <br /> . r r <br /> 4 \ <br /> f f ! <br /> \! J4f <br /> 1 \ <br /> r I J <br /> \ 1 <br /> J r r <br /> 1 <br /> / J J <br /> \ <br /> i r rr <br /> \ <br /> \r \r <br /> \ <br /> f r <br /> t \ <br /> r <br /> J I ! <br /> tl f\! <br /> ♦ <br /> typical 3 inch annulus �; ;•; <br /> ♦ <br /> r / <br /> f r r <br /> 4 � <br /> 112 foot bentonite pellets machine slotted wellscreen <br /> 2 feet in length <br /> washed sand filter pack, 1 --- 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 6 <br />