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WASTE DISCHARGE REQUIREMENTS GENERAL ORDER -8- US ARMY CORPS OF ENGINEERS PORT OF STOCKTON MAINTENANCE DREDGING STOCKTON DEEP WATER SHIP CHANNEL CONTRA COSTA,SACRAMENTO, &SAN JOAQUIN COUNTIES which the concentrations of contaminants of concern in the discharge can be calculated in the receiving water. The submitted dilution modeling is subject to review and approval by the Executive Officer. The Discharger shall not cause the following Receiving Water Limits to be exceeded at the edge of the plume, and not more than 300 feet downstream of the point of discharge. The allowable cross section of the plume shall not exceed 50% of the cross section of the receiving water. The volumetric flow of the river used in the plume model shall be predicted by an acceptable mathematical model,such as the use of the average monthly flow from the Department of Water Resources Delta Simulation Model for the calendar month in which the discharge will occur. Calculations need be submitted only for the constituent exceeding concentrations in Discharge Applicability Table (A.3). The Discharger shall provide a copy of the technical report prepared for compliance with Provision F.1 to each interested parry or agency which has requested a copy of the report at the same time the report is submitted to the Board. Interested parties will have two weeks to review the report and provide comments to the Executive Officer for his consideration. Receiving Water Limits(Total recoverable) Receiving Water Limits(Dissolved)2&3 Constituent gWL.IL2Ll Constituent RWL, Ugh Antimony 6.01 Antimony N/A Arsenic 5.0 Arsenic 5.0 Barium 10001 Barium N/A Copper 9.82 Copper 9.428 Lead 2.42 Lead 1.976 Mercury 2.01 Mercury N/A Thallium 2.01 Thallium N/A Zinc 88.02 Zinc 86.768 1 Based upon California's Primary Maximum Contaminant Level for drinking water 2 These RWLs based upon 4-day average total recoverable concentration All concentrations are based upon a river hardness of 80 mg/l. If the anticipated river hardness for the time of dredging is different from 80 mg/l, a rationale for river hardness may be submitted and the RWLs may be calculated as follows: (Total Recoverable)Cu=e(0.8545[ln(hardness value in mg/l as CaCO3)1-1.4651 iDissolved) Cu= (e 10.8545[ln(hardness value in mg/1 as CaCO3)]-1.465))x(0.960) (Total Recoverable) Pb=e(I.273[ln(hardness value in mg/I as CaCO3)]-4.705) (Dissolved) Pb=e(1.273[ln(hardness value in mg/l as CaCO3)1-1.460x(0.791) (Total Recoverable)Zn=e[0.8473[ln(hardness value in mg/l as CaCO3)1+0.7614) (Dissolved) Zn=e[0.8473[ln(hardness value in mg/l as CaCO3)1+0.7614)x(0.986) 3 Conversion factors from 40 CFR 131 were applied to total recoverable constituent concentrations to convert to allowable dissolved concentrations. Not all RWLs listed above have a conversion factor identified in 40 CFR 131. Those constituent without a conversion factor. identified by N/A, will have to comply to the Total Recoverable RWL values. 2. The Discharger shall submit an Operation Plan for each Dredge Material Disposal Site, this technical report shall describe site operations and procedures to be followed before,