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KLEINFELDER 3 SCOPE OF WORK 3.1 PERMITTING AND PRE-FIELD ACTIVITIES The San Joaquin County Public Health Services Department Environmental Health Division (PHS/EHD) requires completion of a well permit, and payment fees prior to installation of monitoring wells. Because the monitoring wells are being installed due to the requirements of the RWQCB, we do not anticipate that extensive review of this workplan by PHS/EHD will be necessary. Kleinfelder will prepare drilling permit applications for submittal to PHS/EHD along with the required initial fees. The permits must be approved prior to drilling activities and sampling. PHS/EHD usually requires up to approximately two weeks to issue the permits following RWQCB approval. This workplan should be submitted by the client to RWQCB and PHS /EHD under a separate cover letter. The drilling subcontractor will contact Underground Service Alert 48 hours prior to conducting fieldwork to notify local utilities of our proposed subsurface assessment. Kleinfelder will additionally prepare a health and safety plan prior to the actual field assessment. 3.2 MONITORING WELL INSTALLATION Two (2) monitoring wells will be installed at the locations shown on Plate 2. The proposed well locations have been selected to address groundwater conditions upgradient of the wastewater application areas. Based upon available information, we anticipate groundwater in the vicinity of the project site to be present at a depth of approximately 15 to 20 feet below the ground surface, with a groundwater flow direction to the north-northeast in the Rapid Infiltration Area and to the west in the Louise Avenue Infiltration Area. The soil borings will be drilled with 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 and possible laboratory analysis. Lithologic classification will be based on the Unified Soil Classification System (USCS). All equipment used in the drilling and installation procedures will be cleaned and/or decontaminated as described in Appendix A. Soil cuttings generated from the drilling operation will not be contained and will be spread on site. Kleinfelder proposes to analyze three(3) soil samples from each boring. The first soil sample will be collected at 5 feet below the ground surface. The second soil sample will be collected at 10 feet below the ground surface, and the third soil sample will be collected just above groundwater. After collection, the soil samples will be labeled, logged on a chain-of-custody, and immediately stored in an iced cooler. The samples will be analyzed as described in Section 3.4. 204587-02.WP2/2002R489 Page 5 of 12 Copyright 2002,Kleinfelder,Inc. June 6,2002