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. KLElNFELDER 3. PIEZOMETER INSTALLATION i Seven piezometers will be installed at the site. The piezometers will subsequently be developed and surveyed. Subsequent to a single groundwater sampling event, pressure transducers/data loggers will be Installed In each of the piezometers to monitor groundwater levels over time. 3.1 PERMITTING AND PRE-FIELD ACTIVITIES The San Joaquin County Environmental Health Department (EHD) requires completion of a well permit, and payment fees prior to installation of the piezometer. Kleinfelder will prepare drilling permit application for submittal to EHD along with the required fees and this workplan. The permits must be approved prior to drilling activities and sampling. EHD typically requires approximately two weeks to issue the permits. Kleinfelder will contact Underground Service Alert 48 hours prior to conducting fieldwork to notify local utilities of the proposed subsurface assessment. 3.2 PIEZOMETER INSTALLATION Seven piezometers will be installed at the proposed locations shown on Plate 2. The locations have been selected to assess groundwater conditions throughout the site and are also based on reasonable access. The soil borings will be drilled to a total depth of approximately 30-feet bgs using a truck mounted drill rig equipped with 8-inch hollow stem augers. During advancement of the soil borings, soil samples will be -collected at five-foot intervals for lithologic classification based on the Unified Soil Classification System (USCS). Equipment used in the drilling and installation procedures will be cleaned prior to use and in between boring locations. The soil borings will be advanced approximately 10 feet into groundwater. Fallowing completion of the drilling operation, a 2-inch diameter PVC piezometer will be installed in each of the borings. The piezometers will be constructed with schedule 40 PVC, a 15- foot long 0.010-inch screened section surrounded by and covered by clean sand filter pack (#213), 3-foot bentonite transition seal above the filter pack, and grouted to the surface. Pressure transducers/data loggers will be installed in each of the piezometers subsequent to development and a single sampling event described in the following sections. The piezometers will be finished within'a locking monument style well vault. The proposed piezometer construction is illustrated on Plate 3. 79558.G W 1/ST07R7901FB:Iv Page 4 of 9 ©2007 Kleinfelder October 2, 2007