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m KLEINFELDER 3 SCOPE OF WORK 3.1 PERMITTING AND PRE-FIELD ACTIVITIES The San Joaquin County Environmental Health Division (EHD) requires completion of a well permit, and payment fees prior to the abandonment and installation of monitoring wells. Because the monitoring wells are being abandoned and re-installed due to the requirements of the RWQCB, we do not anticipate that extensive review of this workplan by EHD will be necessary. Kleinfelder will prepare drilling permit applications for submittal to EHD along with the required initial fees. The permits must be approved prior to drilling activities and sampling. 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 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 ABANDONMENT (MW-1) The one damaged monitoring well will be overdrilled with an 8-inch hollow stem auger drill rig to a total depth of approximately 75 feet below the ground surface. Once the boring is completed and the former well casing has been removed from the boring to the fullest extent possible, the open borehole will be tremmie grouted to the surface with a neat cement mix. The boring shall be tremmie grouted as required by the San Joaquin County Well Standards to ensure that the borehole is completely filled. 3.3 MONITORING WELL INSTALLATION (MW-1R) One (1) monitoring well will be installed at the location shown on Plate 2. The proposed well location has been selected to replace the damaged monitoring well MW-1. Based upon available information, we anticipate groundwater in the vicinity of the project site to be present at a depth of approximately 65 feet below the ground surface. The soil boring will be drilled with a truck mounted drill rig equipped with 8-inch hollow stem augers. During advancement of the soil boring, soil samples will be collected at five-foot intervals for lithologic classification. Lithologic classification will be based on the Unified Soil Classification System (USCS). All downhole 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. No soil samples will be submitted for laboratory analysis at this time. 24134.E01 / STO3R304 Page 4 of 10 Copyright 2003, Kleinfelder, Inc. February 26, 2003