SITE INFORMATION AND CORRESPONDENCE_CASE 2

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WASTE DISCHARGE REQUIRE`A TS v CITY OF TRACY SAN JOAQUIN COUNTY -4- 30-Day 7-Day 30-day Daily Constituents Units Average Average Median Maximum Total Coliform MPN/100 ml --- --- 23 500 Organisms 1 5-day, 20*C biochemical oxygen demand * Based upon a design treatment capacity of 5.5 mgd (241 1/sec) 2. The discharge of an effluent in excess of the following limits is prohi- bited after completion of the 9.0 mgd treatment facility. 30-Day 7-Day 30-day Daily Constituents Units Average Average Median Maximum BOD1 mg/l 20 40 --- 50 lbs/day* 1500 3000 --- 3750 kg/day* 680 1360 --- 1700 Total Suspended mg/l 30 40 --- 50 Matter lbs/day* 2250 3000 --- 3750 kg/day* 1020 1360 --- 1700 Settleable Matter ml/l 0.1 --- --- 0.2 Chlorine Residual mg/l --- --- --- 0.1 Oil and Grease mg/l 10 --- --- 15 lbs/day* 750 --- --- 1125 kg/day* 340 --- --- 510 Total Coliform MPN/100 ml --- --- 23 500 Organisms 1 5-day, 20*C biochemical oxygen demand * Based upon a design treatment capacity of 9.0 mgd (394 1/sec) 3. The arithmetic mean BOD (5-day) and total suspended matter in effluent samples collected in a period of 30 consecutive days shall not exceed 15% of the arithmetic mean of the values for influent samples collected at approximately the same times during the same period (85% removal ) . 4. The discharge shall not have a pH less than 6.5 nor greater than 8.5. 5. The 30-day average daily dry weather discharge flow shall not exceed 5.5 million gallons per day (241 1/sec) prior to completion of the 9.0 mgd treatment facility and 9.0 million gallons per day (394 1/sec) after completion of the expanded facility. 6. The Discharger shall use the best practicable cost-effective control technique currently available to limit mineralization to no more than a reasonable increment.