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CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD <br /> CENTRAL VALLEY REGION <br /> MONITORING AND REPORTING PROGRAM NO. 96-220 <br /> FOR <br /> UNITED STATES ARMY CORPS OF ENGINEERS AND PORT OF STOCKTON <br /> STOCKTON DEEP WATER CHANNEL MAINTENANCE DREDGING ACTIVITIES <br /> FROM CHANNEL MILE 4.4 TO MILE 41.0 <br /> CONTRA COSTA, SACRAMENTO, & SAN JOAQUIN COUNTIES <br /> This monitoring program consists of monitoring of the receiving water at the dredging site and <br /> monitoring of the return water from settling/decanting operations on Roberts Island, Spud Island, and <br /> the Stockton Dredge Material Disposal (DMD) Sites. <br /> PRE-DREDGE SEDIMENT MONITORING <br /> Pre-dredging sediment sampling and analyses shall be performed to determine sediment constituent <br /> concentrations for those items listed in Applicability Section A.3. Discharge Applicability Table. <br /> Soluble metal constituents shall be measured after performing a Title 22 Waste Extraction Test <br /> (WET) procedure that has been modified to use deionized water in place of the citrate buffer <br /> extractant. Another extraction procedure may be used with approval by the Executive Officer. <br /> Analytical methods shall have sufficiently low detection limits to enable a determination be made as <br /> to whether the proposed sediment contains constituent concentrations in excess of those allowed in <br /> the Discharge Applicability Table. <br /> DREDGE SITE RECEIVING WATER MONITORING <br /> Grab samples shall be taken at five feet below the surface of the water and ten feet from the channel <br /> bottom. The two grab samples from each station shall be composited together in equal volumes <br /> resulting in one sample from each station for analysis. Water samples shall be taken from the <br /> following stations: <br /> Station Description <br /> R-1 Upcurrent of the dredging location undisturbed by the dredging <br /> operation, and not to exceed 3000 feet from the dredge. <br /> R-2 300 feet downcurrent of the dredge suction head or clamshell. <br /> Samples shall be collected and analyzed from Stations R-1 and R-2 as follows: <br /> Constituent/ Sampling Minimum <br /> Analysis Units Frequency Detection Limit (mom <br /> Turbidity NTUs Daily <br /> Dissolved Oxygen mg/1 Daily <br /> pH pH units Twice a week <br /> Suspended Solids mg/1 Twice a week <br /> Electrical Conductivity µmhos/cm Twice a week <br /> Hardness, as CaCO3 mg/1 Start-up <br /> Total Arsenic mg/1 Start-up 0.001 <br />