FIELD DOCUMENTS - Laserfiche WebLink

Home Browse Search

WASTE DISCHARGE REQ MENTS ORDER NO. R5-2004-0020 -9- CITY OF MANTECA, CITY CWLATHROP AND DUTRA FARMS WASTEWATER QUALITY CONTROL FACILITY SAN JOAQUIN COUNTY necessary to evaluate impacts to waters of the State to assure protection of beneficial uses and compliance with Regional Board plans and policies, including Resolution 68-16, and to assure compliance with this Order. Evidence in the record includes effluent monitoring data that indicates the presence of constituents that may degrade groundwater and surface water. BIOSOLIDS 21. USEPA has promulgated biosolids reuse regulations in 40 CFR 503, Standard for the Use or Disposal of Sewage Sludge,which establishes management criteria for protection of groundwater and surface waters, sets application rates for heavy metals, and establishes stabilization and disinfection criteria. The Regional Board is using the standards in 40 CFR 503 as guidelines in establishing this Order, but the Regional Board is not the implementing agency for 40 CFR 503 regulations. The Discharger may have separate and/or additional compliance, reporting, and permitting responsibilities to USEPA, which are not covered by this Order. 22. Biosolids, food processing wastewater, and treated municipal wastewater are applied to the City- owned lands. Only the treated municipal wastewater is applied to leased lands. This order requires that the City demonstrate that there is adequate capacity on the City-owned lands to agronomically apply the food processing wastes and all biosolids. COLLECTION SYSTEM 23. The Discharger's sanitary sewer system collects wastewater using sewers, pipes,pumps, and/or other conveyance systems and directs this raw sewage to the wastewater treatment plant. A "sanitary sewer overflow"is defined as a discharge to ground or surface water from the sanitary sewer system at any point upstream of the wastewater treatment plant. Storage and conveyance facilities (such as wet wells,regulated impoundments,tanks, highlines, etc.) for temporary storage may be part of a sanitary sewer system and discharges to these facilities are not considered sanitary sewer overflows,provided that the waste is fully contained within these storage/conveyance facilities. 24. Sanitary sewer overflows consist of varying mixtures of domestic sewage, industrial wastewater, and commercial wastewater. This mixture depends on the pattern of land use in the sewage collection system tributary to the overflow. The chief causes of sanitary sewer overflows include grease blockages, root blockages, debris blockages, sewer line flood damage, manhole structure failures, vandalism,pump station mechanical failures,power outages, storm or groundwater inflow/infiltration, lack of capacity, and contractor caused blockages. 25. Sanitary sewer overflows often contain high levels of suspended solids, pathogenic organisms, toxic pollutants,nutrients, oxygen demanding organic compounds, oil and grease, and other pollutants. Sanitary sewer overflows can cause temporary exceedances of applicable water quality objectives, pose a threat to public health, adversely affect aquatic life, and impair the public recreational use and aesthetic enjoyment of surface waters in the area.