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Ms. Anne P. Conner 4 10/9/2007 Pacific Gas&Electric Company 1.4 Land and Surface Water Use Land use surrounding the site is primarily irrigated agriculture for three primary production crops: asparagus, potatoes and sod (PG&E, 2007). Irrigation water and site hydrologic conditions are controlled through a network of intake and discharge pumps. Intake pumps siphon water from the San Joaquin and Middle Rivers and their cuts in response to local agricultural needs. There is no known intake or discharge pumping schedule or trends in water usage; intake pumping and irrigation, and water discharge, are conducted on an as- needed basis. Local agriculture managers at McDonald Island continuously monitor groundwater conditions to determine when water needs to be pumped from McDonald Island back into the rivers. Discharge pumping generally occurs during periods of high groundwater or flooding. 2.0 FIELD SUPPORT ACTIVITIES Field support activities will be conducted prior to, during, and upon completion of fieldwork. Field support activities include the following: • Obtaining drilling permits • Staking boring locations • Underground utility clearance • Decontamination • Field documentation • Sample labeling, packaging and chain of custody • Surveying The following sections describe these field activities. 2.1 Obtaining Drilling Permits All drilling will be completed in compliance with the requirements for permits issued by San Joaquin County and the State of California. 2.2 Staking Boring Locations The field geologist (or designee)will complete drilling location staking. Staking will consist of placing a stake or hair nail in the ground and marking the proposed boring location. The ground marking will identify the boring by its number and type (shallow soil, intermediate/deep soil, groundwater or temporary piezometer). Marking will be done using either a permanent, waterproof marker or paint. 2.3 Underground Utility Clearance Underground Service Alert will be contacted to mark known utilities at the proposed locations. If any utilities are identified at any drilling location, the field geologist (or designee)will identify a new location that is at least five feet away from any marked utilities. However, considering the historical use of Pond 3 and the closure activities implemented under the pond, it is highly unlikely that utilities exist in the proposed boring locations. 2.4 Decontamination