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WASTE DISCHARGE REQUIREMENTS <br /> CITY OF MANTECA <br /> SAN JOAQUIN COUNTY <br /> 30-Day 7-Day 30-Day Daily <br /> Constituents Units Average Average Median Maximum <br /> Settleable Matter ml/l 0.1 --- --- 0.2 <br /> Chlorine Residual mg/l --- --- --- 0.1 <br /> Total Coliform MPN/100 ml --- --- 23 500 <br /> Organisms <br /> Oil & Grease mg/l 10 --- --- 15 <br /> lbs/day* 480 --- --- 719 <br /> kg/day* 216 --- --- 324 <br /> 1/ 5-day, 200C Biochemical Oxygen Demand <br /> * Based upon a maximum surface water discharge of 5.75 mgd. Allowable mass <br /> loadings will be based on the total flow minus the amount of wastewater disposed <br /> of to land at rates in accordance with the agronomic technical report required by <br /> Provision F.9. <br /> 2. The arithmetic mean biochemical oxygen demand (5-day) and suspended solids <br /> in effluent samples collected in a period of 30 consecutive days shall not <br /> exceed 15 percent of the arithmetic mean of the values for influent <br /> samples collected at approximately the same times during the same period <br /> (85 percent removal ) . <br /> 3. The discharge shall not have a pH less than 6.5 nor greater than 8.5. <br /> 4. The 30-day average dry weather discharge flow shall not exceed 5.75 <br /> million gallons per day less the amount disposed of to land at agronomic <br /> rates. <br /> 5. The Discharger shall use the best practicable cost-effective control <br /> technique currently available to limit mineralization to no more than a <br /> reasonable increment. <br /> 6. Survival of test fishes in 96-hour bioassays of undiluted waste shall be <br /> no less than: <br /> Minimum for any one bioassay - - - - - - - - - 70% <br /> Median for any three or more bioassays - - - - 90% <br /> D. Sludge Disposal : <br /> 1. Collected screening, sludges, and other solids removed from liquid wastes <br /> shall be disposed of in a manner approved by the Executive Officer. <br />