ARCHIVED REPORTS_DRAFT ENVIRONMENTAL IMPACT REPORT

Home Browse Search

AMENDMENT OF WASTE DISCHARGE REQUIREMENTS -5- AMENDMENT OF WASTE DISCHARGE REQUIREMENTS -6- RESOLUTION 6- RESOLUTION NO.R5-2005-0110 RESOLUTION NO.R5-2005-0110 CITY OF MANTECA CITY OF MANTECA WASTEWATER QUALITY CONTROL FACILITY WASTEWATER QUALITY CONTROL FACILITY SAN JOAQUIN COUNTY SAN JOAQUIN COUNTY 4. Effluent Limitations B.3 is amended as follows,replacing the effluent limitations for The City has recently changed facility operations and currently utilizes a centrifuge to dewater bromodichloromethane and dibromochloromethane in Order No.R5-2004-0028: the biosolids prior to hauling them to a landfill for disposal. This disposal practice requires less stringent monitoring requirements than those required if disposing biosolids to land. Therefore, Monthly Weekly I-Hour Daily Monitoring and Reporting Program R5-2004-0028 includes alternative monitoring Constituents Units Average Average Average Maximum requirements,depending on the disposal practice utilized by the City. Bromodichloromethane gg/l 30 --- --- 47 8. Biosolids monitoring required in MRP Order No.R5-2004-0028 shall be replaced as follows: lb/day' 2.5 --- --- 3.9 Dibromochloromethane gg/l 7 --- --- 16 BIOSOLIDS MONITORING lb/day' 0.58 --- --- 1.3 The Discharger has historically disposed of biosolids on City-owned land adjacent to the WQCF. However,the Discharger has recently changed facility operations and currently 3 Based upon a design treatment capacity of 9.87 mgd. disposes biosolids in a landfill for disposal. The biosolids monitoring requirements vary based on the method of disposal. When the Discharger disposes biosolids in a landfill,the Discharger 5. Provisions H.26 shall be added to Order No.R5-2004-0028 as follows: shall comply with the biosolids monitoring requirements identified in Section A,below. If the Discharger returns to disposing of biosolids on land,the biosolids monitoring requirements 26. After installation of ultraviolet disinfection facilities,this Order maybe reopened to identified in Section B apply. The requirements identified in Section C,apply for all methods modify the effluent limitations for bromodichloromethane and dibromochloromethane of disposal: based on the performance of the WQCF. 6. Finding 36 of Order No.R5-2004-0028 shall be replaced as follows: A. The Discharger shall comply with the following biosolids monitoring requirements when biosolids are disposed in a landfill: Bromodichloromethane(BDCM)and dibromochloromethane(DBCM): Based on A composite sample of sludge shall be collected annually in accordance with EPA's information included in analytical laboratory results submitted by the Discharger,the discharge POTW Sludge Sampling and Analysis Guidance Document,August 1989,and tested for has a reasonable potential to cause or contribute to an in-stream excursion above the CTR the following metals: 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 Cadmium Copper Nickel from which both water and organisms are consumed are 0.56µg/1 and 0.41µg/1 for BDCM and Chromium Lead Zinc DBCM,respectively. The maximum observed effluent concentrations for BDCM and DBCM are 25.7µg/1 and 5.5µg/1,respectively. Effluent limitations for BDCM and DBCM are Sampling records shall be retained for a minimum of five years. A log shall be kept of included in this Order based on the CTR criteria for the protection of human health. The sludge quantities generated and of handling and disposal activities. The frequency of Discharger is able to comply with the limitations. entries is discretionary;however,the log should be complete enough to serve as a basis 7. Section 3 of the Information Sheet in Order No.R5-2004-0028 shall be replaced as follows: for part of the annual report. 3 Biosolids Management B. The Discharger shall comply with the following biosolids monitoring requirements when disposing of biosolids to land: The City of Manteca historically dewatered biosolids in drying beds with final disposal to City-owned farmland adjacent to the treatment plant at agronomic rates,as described in the A composite sample of biosolids shall be collected in accordance with USEPA's POTW Order. New limitations on metal concentrations in sludge/soil mixtures and new conditions for Biosolids Sampling and Analysis Guidance Document,August 1989,(or most recent sludge use as a soil amendment have been established. This new permit requires the City to edition)and tested for the following constituents: reevaluate the sludge and effluent application rates to land and submit a land application plan.