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WASTE DISCHARGE REQUOMENTS ORDER NO. R5-2004-002* -15- CITY OF MANTECA, CITYATHROP AND DUTRA FARMS WASTEWATER QUALITY CONTROL FACILITY SAN JOAQUIN COUNTY December 2002 showed total THMs with a maximum concentration of 17 ug/1 and an average concentration of 10 ug/l. Chloroform data collected over the same period showed a maximum concentration of 12 ug/1 and an average concentration of 8 ug/l. Data is not available regarding the constituent concentrations in the receiving water. Considering the available dilution based on the harmonic mean flow of the San Joaquin River, the discharge does not have a reasonable potential to cause or contribute to an in-stream excursion above the water quality objective for MUN use by causing exceedance of the USEPA primary MCL for total THMs or the chloroform OEHHA cancer potency factor's equivalent receiving water concentration. Therefore, effluent limitations for total THMs and chloroform are not included in this Order. 36. Bromodichloromethane (BDCM) and dibromochloromethane (DBCM): Based on information included in analytical laboratory results submitted by the Discharger, the discharge has a reasonable potential to cause or contribute to an in-stream excursion above the CTR criteria for BDCM and DBCM. The CTR includes standards for the protection of human health based on a one-in-a-million cancer risk for these organic constituents. The criteria for waters from which both water and organisms are consumed are 0.56 ug/I and 0.41 ug/1 for BDCM and DBCM, respectively. The maximum observed effluent concentrations for BDCM and DBCM are 3.5 ug/I and 1.2 ug/l, respectively. Effluent limitations for BDCM and DBCM are included in this Order based on the CTR criteria for the protection of human health. The Discharger is able to comply with the limitations. 37. Trichlorophenol: Based on information included in analytical laboratory results submitted by the Discharger, the discharge has a reasonable potential to cause or contribute to an in-stream excursion above the CTR criteria for 2,4,6-trichlorophenol. The CTR includes standards for the protection of human health. The 2,4,6-trichlorophenol criteria for the protection of human health based on a one-in-a-million cancer risk for waters from which both water and aquatic organisms are consumed is 2.1 ug/l. The maximum observed effluent 2,4,6-trichlorophenol concentration is 11 ug/l. 2,4,6-trichlorophenol has not been detected in the upstream receiving water. Effluent Limitations for 2,4,6-trichlorophenol are included in this Order based on the CTR standard for the protection of human health. The Discharger is able to comply with the effluent limitations. 38. Bis(2-ethylhexyl)phtha1ate: Based on information included in analytical laboratory results submitted by the Discharger, the discharge has a reasonable potential to cause or contribute to an in-stream excursion above the CTR criteria for bis(2-ethylhexyl)phthalate. The CTR includes a standard for the protection of human health based on a one-in-a-million cancer risk for bis(2-ethylhexyl)phthalate of 1.8 ug/l. The maximum observed effluent bis(2-ethylhexyl)- phthalate concentration is 7 ug/l. Bis(2-ethylhexyl)phthalate has not been detected in the upstream receiving water. Effluent Limitations for bis(2-ethylhexyl)phthalate are included in this Order based on the CTR criteria for the protection of human health. The Discharger is able to comply with the effluent limitations, 39. Mercury: Based on information submitted by the Discharger, the discharge contains mercury. The Delta waterways are listed in accordance with Clean Water Act Section 303(d) as impaired for mercury based on bioaccumulation of this pollutant in fish tissue. The CTR contains criteria for mercury. The CTR criteria,however, do not address bioaccumulation in the river. The