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MONITORING AND REPORTilvv PROGRAM -3- US ARMY CORPS OF ENGINEERS PORT OF STOCKTON MAINTENANCE DREDGING STOCKTON DEEP WATER SHIP CHANNEL CONTRA COSTA, SACRAMENTO, &SAN JOAQUIN COUNTIES RECEIVING WATER MONITORING FOR THE DMD SITE DISCHARGE Grab samples shall be taken at five feet below the surface of the water and ten feet from the channel bottom. Two grab samples from each station shall be composited together in equal volumes resulting in one sample from each station for analysis. Water samples shall be taken from the following stations: Station Description R-3 Upcurrent of the discharge location and undisturbed by the discharge of the return water from the sedimentation basin(s), not to exceed 300 feet from the point of discharge. R-4 300 feet down current of the discharge point and on the same side of the river as the discharge point. Samples shall be collected and analyzed from Stations R-3 and R-4 as follows: Constituent/ Sampling Minimum Analysis ni Frequency, Detection Limit (,m2/1) Turbidity NTUs Daily Dissolved Oxygen mg/l Daily pH pH units Twice a Week Suspended Solids mg/1 Twice a Week Electrical Conductivity mhos/cm Twice a Week Hardness, as CaCO3 mg/1 Biweekly Total Cadmium mg/l Initiation of discharge 0.0005 Total Chromium mg/1 Initiation of discharge 0.001 Total Nickel mg/l Initiation of discharge 0.005 Total Arsenic mg/1 Biweekly 0.001 Total Copper mg/l Biweekly 0.001 Total Mercury mg/1 Biweekly 0.0002 Total Lead mg/l Biweekly 0.002 Total Thallium mg/l Biweekly 0.001 Total Zinc mg/1 Biweekly 0.002 DREDGED MATERIAL DISPOSAL SITE SEDIMENT MONITORING The dredged sediments remaining at the Dredged Material Disposal Sites may be required to be tested after dredging operations. If so requested by the staff of the Regional Board, the testing shall be as follows: Constituent/ Analysis Minimum Analsis Units Method Detection Limit (m a) pH pH units -- -- Electrical Conductivity mhos/cm -- Pesticides and PCBs mg/kg 8080 --