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GROUND WATER MONITORING WORK PLAN DREDGE MATERIAL DISPOSAL SITE 1,ROBERTS ISLAND,PORT OF STOCKTON Table 2: Water Sample Intervals GEOLOGIC MATERIAL RATIONALE Dredge materials Characterize water in the dredge material. Peat Layer Characterize water in the underlying peat material. Sandy aquifer Characterize water in the shallow aquifer. The samples will be gently conveyed into laboratory-supplied containers appropriate for the types of analyses specified below. The water sample container will be sealed, labeled, and placed in a cooler containing ice immediately after collection. The label will identify the top of the sample interval and will include boring number, sample depth, date and time of sample collection, and sampler's initials. The samples will be transported to the designated state- certified laboratory following standard chain-of-custody protocols. 3.1.2.6 Surface Water Sampling Surface water samples will be collected from the San Joaquin River and from Bums Cutoff. The water will be collected by lowering a one liter glass bottle beneath the surface and then decanting the surface water into laboratory-supplied containers for the appropriate type of analyses. The water sample container will be sealed, labeled, and placed in a cooler containing ice immediately after collection. The label will identify the top of the sample interval and will include boring number, sample depth, date and time of sample collection, and sampler's initials. The samples will be transported to the designated state-certified laboratory following standard chain-of-custody protocols. 3.1.2.7 Boring Completion Upon completion of all sampling and data collection activities, the borings will be tremie grouted to ground surface using a mixture of neat cement and bentonite clay. The top of the boring will be finished similar to surrounding materials. A licensed surveyor will locate each boring relative to mean sea level elevation. The boring locations will also be located laterally within the NAD 23 coordinate system using GPS equipment. Dredge materials generated from the borings will be left on-site. Water and wastewater generated from investigative and decontamination activities will be placed in a 55-gallon DOT January 2005 Page 12 Environmental Risk Services,Corp.