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FACT SHEET ORDER NO. R5-2002-_ -29- CITY OF STOCKTON REGIONAL WASTEWATER CONTROL FACILITY SAN JOAQUIN COUNTY LATE REVISIONS likely, that the Steering Committee will recommend a TMDL implementation plan, including load allocations, to the Regional Board staff by the year 2002." The Regional Board finds that, as long as the Discharger consistently achieves compliance with the CBOD limitations, continues participation with the TMDL development, proceeds with planning, design and construction of Title 22 filtration/disinfection, complies with the effluent DO limitation, and complies with the time schedule to build nitrification facilities for the purpose of preventing ammonia toxicity, no additional ammonia removal facilities will be required pending completion of the TMDL. This Order contains a reopener to consider CBOD and ammonia limitations after the TMDL is completed. 11.0 Priority Pollutants This section and its subsections discuss how priority pollutants are evaluated against criteria and how limitations and interim requirements are developed. Section 11.1 specifically discusses the applicable criteria and guidance for determining the effluent limitations of priority pollutants, Section 11.2 provides the reasonable potential analysis, Sections 11.3, 11.4, and 11.5 discuss the inorganic, human health and bioaccumulative priority pollutants, respectively, with respect to calculation of effluent limitations, and compliance schedules. 11.1 Applicable Criteria and Guidance for Priority Pollutants For priority pollutants, guidance for determining reasonable potential, effluent limitations, and compliance schedules is provided by the SIP, adopted in March 2000 by the SWRCB. US EPA promulgated the numeric water quality criteria for priority pollutants with the adoption of the CTR in April 2000. Table 1 I-1 summarizes the priority pollutants of concern and their respective criteria. Not all of the designated human carcinogen priority pollutants have promulgated CTR criteria. Chloroform, for example, does not have promulgated CTR human carcinogen criteria; however, the National Ambient Water Quality Criteria provides criteria. Mercury, dioxin/furans, PCBs, and Group A organo-chlorine pesticides, which include lindane, endrin aldehyde, and DDT, are California 303(d) listed pollutants causing impairment in Delta waterways. This listing is based on the fact that these pollutants bioaccumulate in aquatic organisms and the environment. Bioaccumulative priority pollutants have promulgated CTR criteria protective of human health. However, the bioaccumulation rates in fish tissue used to calculate the CTR water quality criteria are based only on a laboratory derived bioconcentration factor that considers organism uptake from water only and does not consider the contribution from the organism's food source. Therefore, the CTR criteria are not protective of actual bioaccumulation conditions in the River. Health advisories by the Department of Health Services remain in effect for human consumption of fish in the Delta, including the SJR a Stc n. due to excessive c -icentr4'ic;is of mercury" pestis i E in fish flew se current warnings and availL )is fish tissue data confirm that there is currently no assimilative capacity for these pollutants. Therefore, water quality based effluent limitations for these pollutants that properly address bioaccumulation and the non-