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WASTE DISCHARGE REQUIREMENTS -4' <br /> CITY OF STOCKTON <br /> MAIN WATER QUALITY CONTROL PLANT <br /> SAN JOAQUIN COUNTY <br /> Monthly Weekly Daily <br /> Constituents Units Average Average Maximum <br /> BOD mg/l 10 20 30 <br /> lbs/day 4,840 10,180 16,770 <br /> kg/day 2,200 4,600 7,600 <br /> Total Suspended mg/1 10 20 30 <br /> Matter lbs/day 4,840 10,180 16,770 <br /> kg/day 2,200 4,600 7,600 <br /> 3. During the period 1 August through 31 October 1983 and when river <br /> flows past Station R-1 exceed 3,000 cfs, the limits contained in A.2 <br /> above are as follows: <br /> Monthly Weekly Daily <br /> Constituents Units Average Average Maximum <br /> BOD mg/l 20 30 50 <br /> lbs/day 9,680 15,271 27,956 <br /> kg/day 4,390 6,926 12,678 <br /> Total Suspended mg/l 30 45 50 <br /> Matter lbs/day 14,520 22,907 27,956 <br /> kg/day 6,585 10,389 12,678 <br /> 4. The arithmetic mean biochemical oxygen demand (5-day) and suspended <br /> solids in effluent samples collected in a period of 30 consecutive <br /> days shall not exceed 15 percent of the arithmetic mean of the values <br /> for influent samples collected at approximately the same times during <br /> the same period (85 percent removal ) . <br /> 5. The discharge shall not have a pH less than 6.0 nor greater than 8.5 <br /> nor shall it cause a change greater than 0.5 in the pH of the <br /> receiving waters. <br /> 6. Bypass or overflow of untreated or partially treated wastes is <br /> prohibited. <br /> 7. The Discharger shall use the best practicable cost-effective control <br /> technique currently available to limit mineralization to no more than <br /> a reasonable increment. <br /> 8. Survival of test fishes in weekly continuous flow bioassays of <br /> undiluted waste shall be no less than: <br /> Minimum for any one bioassay ---------- 70% <br /> Median for any three or more consecutive bioassays ------- 90% <br />