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WASTE DISCHARGE REQUIREMEMTS ORDER NO. -7- CITY OF ESCALON ESCALON WASTEWATER TREATMENT FACILITY SAN JOAQUIN COUNTY B. Discharge Specifications: 1. For the domestic WWTP, the monthly average dry weather flow shall not exceed 0.90 mgd. The maximum daily flow shall not exceed 1.0 mgd. 2. For the industrial WWTP, the monthly average dry weather flow shall not exceed 2.0 mgd. The maximum daily flow shall not exceed 3.0 mgd. These industrial flow limits will remain in effect until the industrial wastewater treatment facilities improvements are completed, and a technical report (as described in Provision F.1) has been submitted and approved by the Executive Officer. Upon approval of the technical report, the Discharger's flow limits will be allowed as presented in Discharge Specification No. B.3. 3. Upon approval of the technical report required by Provision F.1, flow rates at the industrial WWTP may increase as follows: the monthly average dry weather industrial discharge flow shall not exceed 70 million gallons (mg) in June, 80 mg in July and August, 100 mg in September and October, and 70 mg in November. The maximum daily industrial flow shall not exceed 3.4 mgd. Only stormwater can be discharged to the industrial ponds during the months December through May. 4. The effluent discharged to the domestic evaporation/percolation ponds shall not exceed the f6llowing limits. Constituent Units Monthly Average Daily Maximum BODS mg/l 401 80 Settleable Matter ml/1 0.21 -- If the reported concentration is greater than the criterion presented, a confirmation sample shall be collected for analysis within seven days of receiving the analytical data. 5. The effluent discharged to the industrial evaporation/percolation ponds shall not exceed the following limits. Constituent Units Monthly Average BOD5 mg/l 150 6. Objectionable odors originating at this facility shall not be perceivable beyond the limits of the wastewater treatment facility. 7. As a means of discerning compliance with Discharge Specification No. B.6, the dissolved oxygen content shall not be less than 1.0 mg/l in any pond at any time, as measured at a point at as far as practical from the pond inlet and within one foot of the water surface. 8. The treatment facilities shall be designed, constructed, operated, and maintained to prevent inundation or washout due to floods with a 100-year return frequency.