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DRAFT 0 • Identification of chemicals of potential concern (COPC) and their physical constants and concentrations to evaluate industrial/commercial use exposure. • Description of human toxicity information of the specific COPC, and • A risk characterization summary of the exposure assessment and toxicity information for each chemical and exposure pathway. Please note depending on specific proposed building locations and preliminary HRA findings, additional evaluation of soil vapor intrusion may be warranted based on an additional soil vapor assessment after conclusion of excavation activities. TASK 3 — MONITORING WELL INSTALLATION ACTIVITIES Permitting and Pre-Field Activities EHD requires completion of a well permit, and payment fees of prior to installation of monitoring wells. 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. This workplan should be submitted by the client to EHD under a separate cover letter. EHD may bill the Client directly for oversight time on the project. Kleinfelder will visit the site to mark the assessment area for Underground Service Alert at least 48 hours prior to conducting the field work. Kleinfelder will also notify Chevron Pipeline Company and PG&E at least 72 hours prior to conducting field work Monitoring Well Installation and Surveying Three (3) monitoring wells will be installed at the locations shown on Plate 2. The proposed well locations have been selected to address groundwater conditions in the estimated upgradient and downgradient locations to the pipeline spill. One well is proposed upgradient and two down-gradient of the spill area. Based upon available information, we anticipate groundwater in the vicinity of the project site to be present at a depth of approximately 40-45 feet bgs with a groundwater flow direction to the north- northeast. 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 B. Soil cuttings generated from the drilling operation will be contained in 55-gallon drums or removed offsite as part of the 44843.T04/ST05R997/DH:Iv Page 8 of 14 ©2005 Kleinfelder, Inc. August 16, 2005