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v .s CITY OF STOCKTON MAIN WATER QUALITY CONTROL PLANT San Joaquin County 2. The arithmetic mean biochemical oxygen demand (5-day) and suspended solids in effluent samples collected in a period of 30 consecutive days shall not exceed 15 percent of the arithmetic mean of the values for influent samples collected at approximately the same times during the same period (85 percent removal) . 3. The discharge shall not have a pH less than 6.5 nor greater than 8.5, nor shall it cause a change greater than 0.5 in the pH of the receiving waters. 4. Prior to 1 July 1977, the average daily dry weather discharge shall not exceed 51 million gallons. 5. Bypass or overflow of untreated or partially treated waste is prohibited. 6. The discharger shall use the best practicable cost effective control tech- nique currently available to limit mineralization to no more than a reason- able increment. 7. Survival of test fishes in 96-hour bioassays of undiluted waste shall be no less than: Minimum, any one bioassay. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70% Median, any three or more consecutive bioassays. . . . . . . . . . . . 90% 8. The maximum temperature of the discharge shall not exceed the natural re- ceiving water temperature by more than 20 Fahrenheit degrees. 9. The discharge shall not cause degradation of any water supply. 10. Effective 1 July 1977, the discharge of an effluent in excess of the fol- lowing limits is prohibited: 30-day 7-day 30-day Daily Constituent Units Average Average Median Maximum B.O.D. (1) mg/l 10 20 -- 30 lbs/day 4,835 10,175 -- 16,765 Total Suspended mg/l 10 20 -- 30 Solids lbs/day 4,835 10,175 -- 16,765 Settleable Matter ml/l -- -- -- 0.1 Chlorine Residual mg/l -- -- -- 0.1 Total Coliform MPN/100 ml -- -- 23 500 Organisms Grease 6 Oil mg/l 10 -- -- 15 lbs/day 4,835 -- -- 8,380 (1) 5-Day, 20oC Biochemical Oxygen Demand 3 -