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r r�r �r r� r r r r � rr r■� r r r r r � r <br /> SOIL VENT GAS INFLUENT CONCENTRATIONS <br /> 1000 <br /> E 800 <br /> a <br /> N <br /> C <br /> O <br /> m <br /> 600 <br /> N _ <br /> V <br /> C <br /> V <br /> U <br /> U _- <br /> Z 400 <br /> Q <br /> ++ a <br /> C - <br /> d <br /> 7 <br /> G <br /> 200 <br /> 0 <br /> Aug92 Nov 92 Feb 93 May 93 Aug93 Nov 93 Feb 94 May 94 Aug94 Nov 94 Feb 95 Ma 95 Aug95 Nov 95 Mar 96 <br /> 0 0 950 0 750 650 100 70 90 65 0 0 1 0 1 <br />