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WASTE DISCHARGE REQUIREMENTS - GENERAL ORDER -3- U.S. ARMY CORPS OF ENGINEERS AND THE PORT OF STOCKTON STOCKTON DEEP WATER SHIP CHANNEL MAINTENANCE DREDGING ACTIVITIES MILE 4.4 TO MILE 41.0, CONTRA COSTA, SACRAMENTO &SAN JOAQUIN COUNTIES Constituent Average Concentration, mg kg Thallium 0.6 Zinc 40.5 9. The COE will conduct pre-dredging chemical and physical testing of sediments within the ship channel to be dredged before each maintenance project. The purpose of predredging sediment analysis is to demonstrate that the dredging operation (including disposal of dredged sediments), meets the criteria for coverage by this Order and poses no threat to water quality. 10. The beneficial uses of the San Joaquin River are municipal, industrial, and agricultural supply; recreation; esthetics enjoyment; ground water recharge; fresh water replenishment; navigation; fish spawning and migration; and preservation and enhancement of fish, wildlife, and other aquatic resources. 11. The beneficial uses of the ground water are municipal, industrial, and agricultural supply. 12. The Board adopted a Water Quality Control Plan, Second Edition, for the Sacramento-San Joaquin River Delta Basin (513) (hereafter Basin Plan) which contains water quality objectives for all waters of the Basin. These requirements implement the Basin Plan. 13. The Discharger has submitted information about the probable constituents and their concentrations in the dredge return waters, and about the receiving water. Based on this information, the Board finds that the dredge return water discharges will not cause or contribute to a violation of a water quality objective. 14. The dredge return water discharges are consistent with the antidegradation provisions of 40 CFR 131.12 and State Water Resources Control Board Resolution 68-16. The Order allows for an increase in the discharge of pollutants, mainly sediment and metals, that may lead to degradation of water quality. The nature of the discharge is such that the degradation can only occur during limited periods and will be localized. The discharge of pollutants will not cause a violation of water quality objectives nor impairment of beneficial uses. Additionally, the discharge is necessary to accommodate economic expansion in the area and the activity the discharge allows is a benefit to the people of the state.