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WASTE DISCHARGE REQSkEMENTS ORDER NO. 5-01-119 (ROISED) -2_ STOCKTON COGEN COMPANY SAN JOAQUIN COUNTY 5. The Report of Waste Discharge, as well as recent monitoring reports, describe the discharge as follows: Daily Maximum Flow: 1.073 million gallons per day (mgd) Average Temperature: 69°F Constituent _Daily max mg/11 Oil and Grease 6.0 COD 24 TSS 18 TOC 13 Chlorine Residual 0.06 Arsenic 0.028 Copper 0.05 Molybdenum 0.015 Total Dissolved Solids 1000 6. For discharges to surface water, the Discharger requested in their Report of Waste Discharge dated 23 November 1999 an increase in the maximum allowable discharge flow to 1.3 mgd from the 0.9 mgd in their previous WDRs (Order No. 95-148). In evaluating such a request the Board must consider anti-degradation pursuant to 40 CFR 131.12 and SWRCB Resolution No. 68-16. Historical effluent data finds the quality of the effluent to be better than downstream receiving waters and dissolved oxygen to be higher than both the receiving water and applicable Basin Plan water quality objectives. These are considered benefits to the receiving water. Also, constituents for which the Discharger has permanent or interim effluent limits as part of Section B. Effluent Limitations are not bioaccumulative nor are they responsible for downstream impairment or 303(d) listing. Based on these findings the Board finds that the proposed increase in the maximum allowable discharge will have an insignificant impact on beneficial uses and is therefore acceptable. 7. The U.S. Environmental Protection Agency (EPA) and the Board have classified this discharge as a minor discharge. 8. The Board adopted a Water Quality Control Plan Fourth Edition,for the Sacramento and San Joaquin River Basins, (hereafter Basin Plan). The Basin Plan designates beneficial uses, establishes water quality objectives, and contains implementation programs and policies to achieve water quality objectives for all waters of the Basin. These requirements implement the Basin Plan. 9. USEPA adopted the National Toxics Rule (NTR) on 5 February 1993 and the California Toxics Rule (CTR) on 18 May 2000. These Rules contain water quality standards applicable to this discharge. The State Water Resources Control Board adopted the Policy for Implementation of Toxics Standards for Inland Surface Waters, Enclosed Bays, and Estuaries of California (known as the State Implementation Plan (SIP)), which contains guidance on implementation of the National Toxics Rule and the California Toxics Rule.