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a WASTE DISCHARGE REQ-U- —"MENTS ORDER NO. 5-00-226 -2- COUNTY OF SAN JOAQUIN DEPT. OF PUBLIC WORKS COUNTY SERVICE AREA NO. 44 CASTELLO ESTATES AKA APRICOT ACRES SAN JOAQUIN COUNTY Analvte Units 3 Sept. 1999 16 Sept. 1999 Total Hardness mg/l 260 260 Nitrate as Nitrate mg/l 21 21 Specific Conductance umhos/cm 930 910 Total Dissolved Solids mg/l 580 610 Sodium mg/1 96 91 Chloride mg/l 94 94 8. The RWD states that the anticipated average influent wastewater strength is anticipated to be: Constituent Units Concentration Daily Load Ratel BODS mg/1 250 63 lbs/day Total Suspended Solids mg/l 225 561bs/day Total Nitrogen mg/l 45 11 lbs/day 1 Load rate calculated at a flow rate of 30,000 gal/day. 9. Sewage will be conveyed from the residences to the treatment plant through an eight inch diameter, rubber gasketed, gravity collection system. 10. Treatment consists of a complete mix, nitrification/denitification, modified batch process. Disinfection will be accomplished using ozone injection. Treated wastewater will be discharged to computer controlled subsurface emitters. The plant layout and leachfield location is presented in Attachments B 1 and B2, which are attached hereto and made part of the Order by reference. 11. The package plant units consist of a 20 feet deep influent pump station (wet well), three 4,000-gallon equalization tanks, an aeration chamber, a clarifier chamber(which will return activated sludge to the aeration chamber), an ozone disinfection chamber, two sand filters (which will backflush to the equalization system), and the subsurface emitters. 12. The treatment plant is rated for a total daily flow of 30,000 gpd. The plant is designed to denitrify and disinfect the wastewater prior to disposal. An emergency generator will provide electrical power in the event of electrical power outages. 13. Waste sludge generated from the treatment plant will be aerobically digested in above ground tanks. 14. Effluent from the treatment plant will be discharged to a disposal area located along the southeast border of the development. Subsurface emitters will be buried approximately one foot below the surface. Discharge will be controlled by a set of moisture sensors placed in the disposal area. The moisture sensors and the computer controls will pulse the application of wastewater to prevent excessive moisture in the disposal area.