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CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION ORDER NO. 96-220 WASTE DISCHARGE REQUIREMENTS GENERAL ORDER FOR UNITED STATES ARMY CORPS OF ENGINEERS AND THE PORT OF STOCKTON STOCKTON DEEP WATER SHIP CHANNEL MAINTENANCE DREDGING ACTIVITIES FROM CHANNEL MILE 4.4 TO MILE 41.0 CONTRA COSTA, SACRAMENTO, & SAN JOAQUIN COUNTIES The California Regional Water Quality Control Board, Central Valley Region, (hereafter Board) finds that: 1. The U. S. Army Corps of Engineers (COE) and the Port of Stockton (Port) submitted a Report of Waste Discharge, dated 26 March 1993, for the Stockton Deep Water Ship Channel Maintenance Dredging and Disposal Activities in the San Joaquin River. Additional sampling and analysis and supplemental information was received from the COE on 2 May 1994. The maintenance dredging material disposal (DMD) sites are owned by the Port. The COE and the Port are hereafter jointly referred to as Discharger. Order No. 94-180 was adopted by the Board on 24 June 1994 and revised on 17 August 1995. By letter dated 18 July 1996, the COE requested modification of Order No. 94-180 (revised) to allow consideration of mixing zones and alternative testing criteria. 2. The maintenance dredging activities addressed in this General Order include disposal or discharge of maintenance dredging sediments, dredge return waters, pre-dredge sampling, and water quality monitoring during actual dredging operations. 3. These General Order Waste Discharge Requirements (WDRs) are for maintenance dredging activities from the turning basin in the Port of Stockton at channel mile 41.0. to the western boundary of Region 5 near Collinsville or approximately channel mile 4.4 along the San Joaquin River's deep water ship channel. See Attachment "A", incorporated herein and made part of this Order. 4. When the Discharger decides that maintenance dredging activities are needed on a specific reach of the deep water ship channel, the Discharger must file a separate Notice of Intent and filing fee for each of these maintenance dredging projects in order to be eligible for coverage under this Order. The minimum contents of the 'Project' Notice of Intent are detailed in Attachment "B",Application Requirements, incorporated herein and made part of this Order. 5. The dredging operations will primarily involve the use of a hydraulic cutter head suction dredge or a hopper dredge for maintaining the needed width and depth in the existing ship channel. Recent advances in clamshell dredging buckets have produced 'sealed' or 'environmental' buckets which greatly reduce the amount of turbidity in the water column and the amount of water produced during the dredging operation. These WDRs will allow the use of a sealed bucket and barge for maintenance dredging. The average width of the ship channel is 330 feet wide. The ship channel varies in width from 200 feet to 600 feet, except in the