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CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION ORDER NO. T WASTE DISCHARGE REQUIREMENTS FOR UNITED STATES ARMY CORPS OF ENGINEERS AND THE PORT OF STOCKTON STOCKTON DEEP WATER SHIP CHANNEL AND TURNING BASIN MAINTENANCE DREDGING PROJECT MILE 36.5 TO MILE 41.0 SAN JOAQUIN COUNTY The California Regional Water Quality Control Board, Central Valley Region, (hereafter Board) finds that: 1 . The U. S. Army Corps of Engineers (Corps) submitted a complete Report of Waste N Discharge, dated May 1992, for the Stockton Deep Water Ship Channel Maintenance Dredging Project (hereafter project) . The project dredging site disposal are is owned by the Port of Stockton (Port) . (The Corps and the Port are hereafter jointly referred to as Dischargers) . 2. The project will involve dredging of approximately 267,000 cubic yards of T sediment from the turning basin in the Port of Stockton, Mile 41 .0, to Buckley Cove, Mile 36.5 along the San Joaquin River. See Attachment "A" , incorporated herein and made part of this Order. 3. The project will involve the use of a hydraulic cutter head suction dredge for A deepening and widening the ship channel . The work area is an average of 500 feet wide. The ship channel varies in width from 200 feet to 250 feet, except in the turning basin where it is 970 feet wide. The 4.5 miles of waterway will be dredged to maintain an average depth of 35 to 36 feet from Mile 36.5 to Mile 39.3 and from Mile 40.2 to Mile 41 .0, and 40 to 41 feet from Mile 29.3 to Mile 40.2, along the channel . 4. Following excavation, dredged sediment will be P transported by pipeline for P P settling and disposal onto 210 acres of land (upland disposal ) on Richards Island. See Attachment "B", incorporated herein and made part of this Order. The settling ponds are designed to remove a significant portion any suspended material . The settling pond design has shown to be effective in the Sacramento Deep Water Channel Dredging Project regulated by Order No. 88-143. Return water will be discharged to the San Joaquin River, at a location shown on Attachment "B" . The disposal site has a capacity of 3,000,000 cubic yards. 5. The Report of Waste Discharge estimates the rate of dredged spoil and return water discharge as follows: Dredge Material Disposal : 8,000 cubic yards per day Return Water Average Flow: 2.8 million gallons per day (mgd) Return Water Maximum Flow: 4.7 mgd 6. The Dischargers' Project is in northwestern sections of T1N, R6E, Section 1 of TIN, RSE, and Section 36, T2N, RSE, MDB&M, with surface water drainage to the San Joaquin River.