SITE INFORMATION AND CORRESPONDENCE_1985-2004

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WASTE DISCHARGE REQUIREtvmNTS 5 CITY OF MANTECA AND CITY OF LATHROP WASTEWATER QUALITY CONTROL FACILITY SAN JOAQUIN COUNTY 30-Day 7-Day 30-Day Daily Constituents Units. Average Average Median Maximum BOD' mg/I 20 30 50 Total Suspended mall 20 30 50 Matter Settleable Matter m]/1 0.1 0.2 Chlorine Residual mg/l 0.1 Total Coliform MPN/100 ml 23 500 Organisms Oil & Grease mg/l 10 _ 15 ' 5-day, 20°C biochemical oxygen demand (BOD) 2. The arithmetic mean of 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.. 4. The Discharger shall use the best practicable cost-effective control technique currently available to limit mineralization to no more than a reasonable increment. The Discharger shall comply with this limitation by (1) submitting a mineralization plan for approval and (2) implementing the approved plan. 5. Survival of aquatic organisms in 96-hour bioassays of undiluted waste shall be no less than: Mmimum for any one bioassay - ---- - -- - 70% Median for any three or more consecutive bioassays - - -- 90% 6. The maximum eluent temperature shall not exceed the natural receiving water by more than 20 OF. 7. The 30-day average dry weather discharge flow shall not exceed 6.95 mgd prior to completion of the 8.11 mad facility, and after completion of the expanded facility flow shall not exceed 8.11 mad, less the amount disposed of to land at agronomic rates. D. Sludge Mannement Specifications: 1. The Discharger shall maintain an approved Sludge Management Plan and operate according to that plan. This plan and any revisions shall be approved by the Executive Officer.