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WASTE DISCHARGE REQUMML_ _S ORDER NO.R5-2004-XXXX -3- DEFENSE DISTRIBUTION DEPOT SAN JOAQUIN SHARPE WASTEWATER TREATMENT FACILITY SAN JOAQUIN COUNTY Parameter Units Results Biochemical Oxygen Demand mg/1 5.8 Total Dissolved Solids mg/1 434 Ammonia mg/1 0.22 Total Suspended Solids mg/1 10.8 Settleable Solids mg/l <0.1 Chlorine Residual mg/l 0.35 Oil and Grease mg/1 <5 Temperature Degrees F 64 Electrical Conductivity µmhos/cm 837 pH pH units 7.7 Bioassay %survival 100 Total Coliform Bacteria MPN/100 ml <2 Sanitary Sewer Collection System 11. The Discharger's wastewater collection system consists of two sewer systems: a facility-wide sewer system and a smaller system dedicated to Warehouse Building 330. Wastewater is collected by the sewer system using a combination of gravity flow and lift (pump) stations. There is more than 30,000 feet of collection system piping, including approximately 25,000 feet of main line and approximately 5,000 feet of lateral lines. The system consists primarily of six-inch and 8-inch diameter vitrified clay mains and laterals. There are six lift stations within the sanitary sewer collection system. 12. 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. Temporary storage and conveyance facilities (such as wet wells, regulated impoundments, tanks,highlines, etc.)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 temporary storage/conveyance facilities. 13. At this site, sanitary sewer overflows consist of municipal sewage. 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, and lack of capacity. 14. 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 exceedences 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. 15. The Discharger is expected to take all necessary steps to adequately maintain, operate, and prevent discharges from its sanitary sewer collection system. The Discharger prepared an Operation and Maintenance Manual, Sharpe Army Depot(ES Environmental Services, Inc., 1986) to govern Sanitary Sewer System Operation, Maintenance, Overflow Prevention, and