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CALIFORNIA REGIONAL WATER QUALITY CWfIROL BOARD <br /> CENTRAL VALLEY REGION <br /> MONITORING AND REPORTING PROGRAM NO. 94-180 <br /> FOR <br /> UNITED STATES ARMY CORPS OF ENGINEERS AND PORT OF STOCKTON <br /> STOCKTON DEEP WATER CHANNEL MAINTENANCE DREDGING ACTIVI" "ES <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, <br /> and the Stockton Dredge Material Disposal (DMD) Sites. <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. <br /> Samples shall be collected and analyzed from Stations R-1 and R-2 as follows: <br /> Constituent/ Sampling Minimum <br /> Analysis Units Frame uency Detection Limit (mg/1) <br /> Turbidity NTUs Daily <br /> Dissolved Oxygen mg/l Daily <br /> pH units Twice a week <br /> Suspended Solids mg/l Twice a week <br /> Electrical Conductivity µmhos/cm Twice a week <br /> Hardness, as CaCO3 mg/l Start-up <br /> Total Arsenic mg/l Start-up 0.001 <br /> Total Cadmium mg/l Start-up 0.0005 <br /> Total Chromium mg/l Start-up 0.001 <br /> Total Copper mg/l Start-up 0.001 <br /> Total Mercury mg/l Start-up 0.0002 <br /> Total Nickel mg/l Start-up 0.005 <br /> Total Lead mg/l Start-up 0.002 <br /> Total Thallium mg/l Start-up 0.002 <br /> Total Zinc mg/l Start-up 0.002 <br />