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CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION ORDER NO. 5-00-226 WASTE DISCHARGE REQUIREMENTS FOR COUNTY OF SATIN JOAQUIN DEPT. OF PUBLIC WORKS COUNTY SERVICE AREA NO. 44 CASTELLO ESTATES AKA APRICOT ACRES SAN JOAQUIN COUNTY The California Regional Water Quality Control Board, Central Valley Region (hereafter Board), finds that: 1. W.D.O., Inc. submitted a Report of Waste Discharge (RWD), dated 3 April 2000, to treat and dispose of domestic sewage generated at Castello Estates Subdivision. Additional information was submitted on 24 July 2000 and 22 August 2000. 2. The property is owned by W.D.O., Inc. Presently the property is developed as apricot and walnut orchards. An 83 lot residential subdivision is planned for the 101.4 acre property. The property's Assessor's Parcel Numbers are: 248-070-02, -11, -12, -13, and -14; and 248-090-03 and -04. 3. The subdivision will be equipped with a domestic wastewater collection system; wastewater will be treated in a package treatment plant. Treated wastewater will be discharged to computer controlled subsurface emitters. 4. The ownership and operation of the wastewater treatment and disposal system will be transferred to the County of San Joaquin Department of Public Works (SJDPW) upon completion. SJDPW is hereafter referred to as "Discharger." In a 13 June 2000 correspondence, the SJDPW accepted responsibility for ownership, operation, and maintenance of the wastewater treatment system. 5. The wastewater treatment facility will be located at the eastern cul-de-sac on Falcone Drive near the major cross streets of MacArthur Drive and Linne Road south of Tracy in San Joaquin County. The facility is in Section 3, T3S, R5E, MDB&M as shown on Attachment A, which is attached hereto and made part of the Order by reference. 6. Wastewater will be generated in 83, three or four bedroom private residences. No commercial or industrial development is planned for the area discharging to the treatment system. 7. Water for domestic use will be supplied by a community groundwater production well. The well is screened below a regional clay aquitard which exists at a depth from 280 feet to 530 feet below ground surface (bgs). Samples were collected from the well on 3 September 1999 and 16 September 1999. A summary of the analyses is presented below.