SITE INFORMATION AND CORRESPONDENCE_1985-2004

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REGIONAL BOARD RESPONSE (SWR010CCFEEA-1634) - 2 - PETITION 2 -PETITION FOR REVIEW OF WASTE DISCHARGE REQUIREMENTS ORDER NOS. R5-2004-0028 AND R5-2004-0029 CITY OF MANTECA WATER QUALITY CONTROL FACILITY The wastewater treatment system currently consists of raw influent bar screening,flow metering, and grit removal, followed by primary sedimentation, biofiltration, conventional activated sludge, nitrification and secondary sedimentation. Secondary effluent is applied to agricultural fields at agronomic rates. Excess flows are chlorinated, dechlorinated and discharged to the San Joaquin River. Biosolids are dewatered by settling and evaporation and disposed of on-site by application to the City-owned property at agronomic rates or disposed of at a permitted landfill. Industrial wastewater is currently included in the municipal influent to the treatment plant. National Pollutant Discharge Elimination System (NPDES) Order No. 5-01-007, adopted by the Regional Board on 26 January 2001, was issued to the City of Manteca and the City of Lathrop. It regulated discharges to the San Joaquin River and reclamation activities on City-owned and leased land. Waste Discharge Requirements Order No. 92-052, adopted by the Regional Board on 27 March 1992, was issued to the City of Manteca, and regulated the discharge of biosohds to land. REGIONAL BOARD PERINUTTING ACTIVITY On 19 March 2004, the Regional Board adopted Order No. R5-2004-0028, which rescinded Order Nos. 5-01-007 and 92-052, and included requirements for both the surface water discharge to the San Joaquin River and reclamation activities on both the City-owned and leased lands. The permit was issued to the City of Manteca, the City of Lathrop, and Dutra Farms (the owner of land leased for reclamation). The permit includes several changes from the previous Orders, including: • Expansion of waste treatment design flow • Limited dilution allowance • Incorporation of Title 22 filtration/disinfection requirements (i.e., tertiary treatment) • New ammonia and nitrate limitations requiring nitrification and denitrification of the wastewater • New inorganic pollutant effluent limitations • New organic pollutant effluent limitations • MBAS and foaming effluent limitations • Thermal plan compliance • Pretreatment compliance and approval • Biosolids requirements • Collection system requirements • Segregation of food processing industrial wastewater • Groundwater limitations and additional monitoring requirements • Additional planning and study requirements