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WASTE DISCHARGE REQ MENTS -9- <br /> STOCKTON COGENERATIOK <br /> SAN JOAQUIN COUNTY <br /> Annual Monthly Weekly Daily <br /> Constituents Units Average Average Average Maximum <br /> Total Suspended Solids mg/l -- 20 30 50 <br /> Total Dissolved Solids mg/1 4501 500 -- 1000 <br /> Setteable Solids ml/l -- 0.1 __ 0.2 <br /> Oil & Grease mg/l -- 10 -- 15 <br /> Chlorine Residual mg/1 -- 0.011 -- 0.021'2 <br /> Arsenic µg/1 5.01 -- -- <br /> Molybdenum µg/1 10 <br /> (1) Effective 18 months after adoption of this permit. <br /> (2) Effective immediately and until 18 months after the permit adoption,the chlorine residual shall not <br /> exceed a daily maximum of 0.1 mg/1. <br /> 2. The discharge shall not have a pH less than 6.5 nor greater than 8.5. <br /> 3. The monthly average discharge flow to North Littlejohns Creek shall not exceed 1.3 mgd. <br /> 4. The average daily discharge to land shall not exceed 100,000 gallons per day. <br /> D. Internal Waste Stream Limitations: <br /> 1. As discussed in Finding No. 18 three locations have been identified within the SCC facility <br /> process that require technology-based limitations as prescribed in 40 CFR Part 423.15. <br /> Concentrations of the following constituents shall not exceed the indicated limits for the side <br /> streams as defined below: <br /> Station Description <br /> IWS-1 Cooling tower blowdown(before mixing with RO concentrate) <br /> IWS-2 Internal low volume waste sump discharge <br /> IWS-3 RO concentrate (sampled prior to mixing with cooling tower blowdown) <br /> Monthly Daily <br /> Constituents Units Average Maximum <br /> IWS-1, Priority Pollutantsl) µg/1 ND 2) ND 2) <br /> IWS-1, Chromium (total) mg/l 0.2 0.2 <br /> IWS-1, Zinc (total) mg/l 1.0 1.0 <br /> IWS-1, Free chlorine mg/l 0.5 <br /> IWS-2 & 3, Suspended Solids mg/l 30 100 <br /> IWS-2 & 3, Oil & Grease mg/l 15 20 <br /> 1) The 126 priority pollutants(Appendix A to 40 CFR Part 423)contained in chemicals added for cooling <br /> tower maintenance,except chromium and zinc. Compliance maybe determined by engineering calculations <br /> which demonstrate that the regulated pollutants are not detectable in the final discharge by the analytical <br /> methods in 40 CFR Part 136. <br /> 2) No detectable amount. <br />