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f <br /> 4 <br /> MUAL ACTX91[ EXCOMMATIOM <br /> '. , We recommend that the current groundwater recovery and air <br /> stripping pp g program be continued, and that it should be augmented <br /> rm <br /> with an in-situ bioremediation proyram. The recent pumping test <br /> s of the primary contaminated aquifer (zone 3) demonstrated that an <br /> r <br /> k_ extensive cone of capture can be generated by pumping, and that <br /> k <br /> r effective grotradwater recovery and flow control is poisible. <br /> The hydrocarbon metabolizing micro-organisms present in the <br /> zone 3 could be employed to substantially shorten the time <br /> 1.4 <br /> needed for groundwater contamination cleanup The proposed jXL-- <br /> a ; bioremediation program would greatly accelerate the rate of <br /> microbial destruction of rydro.drbon contamination. The addition <br /> { <br /> of trace amounts of essential rata limiting nutrients and oxygen <br /> to the groundwater would renc,vo the nutritional barriers which ' <br /> { prevent indigenous microber frog, wetabolizirg the hydrocarbons to <br /> carbon dioxide and water. Because zone 5 contamination appears <br /> t to be minimal, we recommend only dumping groundwater from zone 5 x <br /> and passing it t' rough the evis-FUng air stripper. i <br /> s <br /> 24 <br /> J IL <br /> s <br /> M <br /> '7� is 6`�q�s�... •.,,�•^—.., -... __—.. ,....... .� .,. .._ ,. ._ <br /> A +! f <br />