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WASTE DISCHARGE REQUIREMENTS ORDER NO. 5-00-226 -2- <br />COUNTY OF SAN JOAQUIN DEPT. OF PUBLIC WORKS <br />COUNTY SERVICE AREA NO. 44 <br />CASTELLO ESTATES AKA APRICOT ACRES <br />SAN JOAQUIN COUNTY <br />Analyte Units 3 Sept. 1999 16 Sept. 1999 <br />Total Hardness mg/1 260 260 <br />Nitrate as Nitrate mg/1 21 21 <br />Specific Conductance umhos/cm 930 910 <br />Total Dissolved Solids mg/1 580 610 <br />Sodium mg/I 96 91 <br />Chloride mg/1 94 94 <br />8. The RWD states that the anticipated average influent wastewater strength is anticipated to <br />be: <br />Constituent Units Concentration Daily Load Rate' <br />BOD5 mg/1 250 63 lbs/day <br />Total Suspended Solids mg/1 225 56 lbs/day <br />Total Nitrogen mg/1 45 11 lbs/day <br />1 Load rate calculated at a flow rate of 30,000 gal/day. <br />Sewage will be conveyed from the residences to the treatment plant through an eight inch <br />diameter, rubber gasketed, gravity collection system. <br />Treatment consists of a complete mix, nitrification/denitification, modified batch process. <br />Disinfection will be accomplished using ozone injection. Treated wastewater will be <br />discharged to computer controlled subsurface emitters. The plant layout and leachfield <br />location is presented in Attachments B1 and B2, which are attached hereto and made part <br />of the Order by reference. <br />The package plant units consist of a 20 feet deep influent pump station (wet well), three <br />4,000-gallon equalization tanks, an aeration chamber, a clarifier chamber (which will <br />return activated sludge to the aeration chamber), an ozone disinfection chamber, two sand <br />filters (which will backflush to the equalization system), and the subsurface emitters. <br />The treatment plant is rated for a total daily flow of 30,000 gpd. The plant is designed to <br />denitrify and disinfect the wastewater prior to disposal. An emergency generator will <br />provide electrical power in the event of electrical power outages. <br />Waste sludge generated from the treatment plant will be aerobically digested in above <br />ground tanks. <br />Effluent from the treatment plant will be discharged to a disposal area located along the <br />southeast border of the development. Subsurface emitters will be buried approximately <br />one foot below the surface. Discharge will be controlled by a set of moisture sensors <br />placed in the disposal area. The moisture sensors and the computer controls will pulse the <br />application of wastewater to prevent excessive moisture in the disposal area.