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* VOLUME DISCHARGE CONCENTRATION CONCENTRATION YIELD <br />* (ac-ft) (cfsj (mg/1) (ml/1) (tons) * <br /> <br />* 0.347 0.503 4633.32 2.284 1.88 <br />* T 0.347 0.482 6.07 0.002 0.00 <br />* * <br /> <br />* AVERAGE SETTLEABLE CONCENTRATION: <br />* TIME OF VOLUME WEIGHTED DURING ARITHMETIC DURING <br />* SIGNIFICANT TIME OF PEAK TIME OF PEAK <br />* CONCENTRATION SIGN. CONC. 24 HOUR SIGN. CONC. 24 HOUR <br />* (hrs) (ml/1) (ml/1) (ml/1) (ml/1) <br /> <br />* IN 22.70 1.94 1.94 1.42 1.35 <br />* OUT 22.40 0.00 0.00 0.00 0.00 <br /> <br />******************************************,t******************************** **** <br />• <br />• <br />Exhibit 18 Revised 12/8/89 <br />-90- <br />