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GENESIS ENGINEERING 8 REDEVELOPMENT observations of sediment texture, color, odor, and consistency will be noted in the field logs. In some locations,replicate co-located deeper cores will be collected for sediment lithology evaluation. Generally,mixing in the field will create composite samples. The drainages ditches run both north-south and east-west. Based on the regions climate it is assumed that the channel flow is irregular and seasonal. Site reconnaissance activities will determine configuration of discharge points for the ditches. Sediment depths are anticipated to be shallow as a result the flow hydraulics of the system, i.e., narrow, constrained channel and moderate velocities. If feasible, at least one co-located deeper core sample will be collected for lithology evaluation. All samples will be collected from the representative channel bottom locations. Access is anticipated from the bank or by wading along open portions of the ditch. The surface water and sediment samples will be placed on ice in a rigid shipping container, and transferred to the analytical laboratory under chain-of-custody documentation. 3.2.4 Decontamination Activities All equipment that may directly or indirectly contact samples will be decontaminated prior to use. This includes drill bits, drill rods,the portion of drill rig that stands above the borehole, sampling devices, and instruments such a borehole depth sounders. In addition, care will be taken to prevent samples and sampling equipment from coming into contact with potentially contaminating substances such as fugitive dust,tape, oil, engine exhaust, corroded surfaces, dirt, or any airborne source of contamination. A temporary decontamination station shall be set up at the Site to contain decontamination water. Decontamination water will be containerized in U.S. Department of Transportation("DOT") 1 A2-rated drums, or equivalent. Field Equipment Decontamination To the extent practical, drilling will be performed from the "least'to"most'contaminated areas. The following procedures will be used to decontaminate all large pieces of equipment, such as drill rods: 1. External surfaces of equipment will be washed with high-pressure hot water and Alconoxr". In some cases, more vigorous decontamination procedures, such as scrubbing, will be required if visible material remains on the downhole drilling tools after high-pressure washing. Lima Ranch 9 of 17 Site Characterization Work Plan Addendum April 2008