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GENERAL ORDER FOK fOCKTON -3- DEEP WATER SHIP CHANNEL MAINTENANCE DREDGING PROJECTS Receiving Water Limitations When pre-dredge analyses indicate that the sediments exceed the allowable concentrations for one or more pollutants, the Discharger may conduct studies of the proposed discharge and receiving water to determine the potential impact of those pollutants on the receiving waters. Receiving water limitations (RWLs) were established using the U.S. Environmental Protection Agency 4-day freshwater chronic toxicity guidelines and drinking water Maximum Contaminant Levels (MCLs). The Discharger will propose a mathematical model of the discharge plume and determine the concentrations of the constituents in the receiving water. The plume model and results are subject to review and approval of the Executive Officer. A two week review period is provided for interested parties to review the plume report so that the interested parties can provide input to the Executive Officer for his decision. If the proposed discharge does not cause the receiving water limits to be exceeded, the discharge will be approved. If the proposed discharge results in exceedance of the RWLs, the discharge under the General WDRs will be denied. The Order limits the allowable extent of the plume to no more than 50% of the cross sectional area of the receiving water, and to no more than 300 feet down current of the discharge point. MONITORING Predredge sediment testing analysis results will be submitted with the Notice of Intent package prior to receiving the Notice of Applicability to demonstrate applicability of the dredge sediment in complying with the Order. During dredging operations receiving water monitoring is required up and downstream of the dredging activities and at the edge of the mixing zone. River monitoring will include metals'concentrations and general water quality parameters to determine whether Receiving Water Limits are exceeded. The receiving water in the San Joaquin River is also tested upstream and downstream of the discharge point from the DMD site for metals and general water quality parameters. MHM:KDL- 8/9/96