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WASTE DISCHARGE REQUIREM _.FS ORDER NO.R5-2004-XXXX -2- DEFENSE DISTRIBUTION DEPOT SAN JOAQUIN SHARPE WASTEWATER TREATMENT FACILITY SAN JOAQUIN COUNTY facility site plan is shown on Attachment B,which is attached hereto and made part of this Order by reference. 5. The wastewater treatment plant and percolation ponds cover approximately 10 acres of the 720- acre Sharpe facility. 6. The Discharger's wastewater treatment process includes primary treatment, secondary treatment, disinfection, and solids handling systems. The primary treatment consists of physical treatment in a single clarifier to remove settable and floating solids. The secondary treatment consists of a two-stage trickling filter and a second clarifier. Disinfection is accomplished by a chlorine contact tank. Prior to discharge, wastewater is dechlorinated with sulfur dioxide gas. The solids handling system consists of a single anaerobic digester and four sludge-drying beds. Dried sludge is collected from the beds and hauled to a local permitted landfill for disposal. Effluent is currently discharged to an evaporation/percolation pond adjacent to the WWTF or the SSJID Canal under WDR No. 92-184 7. Based on flow monitoring data collected by the Discharger from January 2003 to December 2003, the average dry weather flow to the wastewater treatment plant is approximately 42,000 gallons per day(gpd). The Discharger is currently operating the treatment plant at 10 to 15%of design capacity(380,000 mgd) and an increase in wastewater flows in the next five years is not expected. 8. The evaporation/percolation pond adjacent to the treatment plant is an unlined pond that is approximately two acres in size and has a storage capacity of approximately 50,000 gpd (allowing for two feet of freeboard). If additional disposal capacity is needed or the Discharger needs to perform maintenance on this pond, the treated wastewater will be discharged to a temporary percolation pond located south of Building 404. In November 2003, a two-month percolation test was performed in the area south of Building 404 and a '/4-acre test area was able to accommodate approximately twice the anticipated flow from the WWTF. Approximately 50 acres of open land are available for construction of a temporary pond south of Building 404. Effluent from the WWTF will be conveyed to the temporary pond via tanker trucks or temporary aboveground piping. 9. The designated disposal areas are not located near the Discharger's drinking water supply wells and specific monitoring requirements for the supply wells are not included in attached Monitoring and Reporting Program No E. The primary effluent disposal pond near the WWTF is located more than 4,000 feet south and trans gradient from the nearest facility drinking water supply well. The temporary pond south of Building 404 is located more than 6,000 feet south and trans gradient from the nearest facility drinking water supply well. 10. Monitoring and Reporting Program No. 92-184 requires that the Discharger monitor the WWTF effluent for several constituents. The average concentrations of these constituents for November 2002 through October 2003 are as follows: