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WASTE DISCHARGE REQIMENTS i -4- <br /> STOCKTON COGENERATIOT COMPANY <br /> SAN JOAQUIN COUNTY <br /> 15. Federal Regulations for storm water discharges were promulgated by EPA on 16 November 1990 <br /> (40 CFR Parts 122, 123, and 124). The regulations require specific categories of facilities, which <br /> discharge storm water associated with industrial activity,to obtain NPDES permits and to <br /> implement Best Available Technology and Best Conventional Pollutant Control Technology to <br /> reduce or eliminate industrial storm water pollution. The State Water Resources Control Board <br /> adopted Order No. 97-03-DWQ (General Permit No. CAS000001) (General Permit) specifying <br /> waste discharge requirements for discharges of storm water associated with industrial activities, <br /> excluding construction activities, and requiring submittal of a Notice of Intent by industries to be <br /> covered under permit. This permit does not function as an individual permit for storm water <br /> discharges at the facility. The Discharger must seek separate coverage under the General Permit. <br /> 16. Effluent limitations, and toxic effluent standards established pursuant to Sections 301, 302, 303, <br /> 304, and 307 of the Clean Water Act (CWA) and amendments thereto are applicable to the <br /> discharge. <br /> 17. The discharge is presently governed by Waste Discharge Requirements Order No. 95-148, dated <br /> 23 June 1995. <br /> 18. The technology-based monitoring requirements and effluent limits for the steam electric power <br /> generating point source category at 40 CFR Part 423.15 are applicable to this discharge. <br /> a) The requirements of Part 423.15 0) are applicable to pollutants discharged in the cooling tower <br /> blowdown. <br /> b) The requirements of Part 423.15 (c) are applicable to pollutants discharged from internal low <br /> volume waste sources. There are two significant low volume waste sources at this facility. <br /> The first is the boiler blowdown, steam condensate, and miscellaneous machinery drains which <br /> collect in the internal sump system and is discharged back to the cooling tower system. The <br /> second is that portion of the RO concentrate that is mixed with cooling tower blowdown prior <br /> to discharge North Littlejohn Creek. <br /> The cooling tower blowdown, internal low volume waste sump discharge, and RO concentrate <br /> (portion mixed with cooling tower blowdown only) internal waste streams will each need to be <br /> monitored separately per the Monitoring and Reporting Program No. to determine <br /> compliance with the applicable technology-based limits listed in Internal Waste Stream Limitations <br /> D.1. These monitoring requirements and effluent limits were not part of the previous WDR Order <br /> No. 95-148. <br /> 19. The previous permit provided for a mixing zone for compliance with the Basin Plan water quality <br /> objectives for temperature, total dissolved solids (TDS), and chlorine residual. The mixing zone <br /> extended throughout the entire length of North Littlej ohns Creek, to the confluence with French <br /> Camp Slough. <br /> With regard to mixing zones, the Basin Plan states, "...the Regional Water Board may designate <br /> mixing zones within which water quality objectives will not apply provided the discharger has <br />