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'awl C A M B R I A Ms.Victoria McCartney August 31,2005 investigation to confirm the effectiveness of previous SVE may be warranted. However, we are not proposing additional soil investigation(other than that discussed above) at this time. Cambria believes it is more appropriate to complete the current groundwater and soil investigation prior to assessing the effectiveness of remedial activities. As discussed with SJCEHD during our June 9, 2005 meeting, no additional groundwater monitoring wells are proposed in this work plan. Following this investigation, data from the proposed CPT borings and historical data will be used to determine where intermediate and deep groundwater monitoring wells should be placed and what depths should be screened. , Cambria presents specific work tasks to be completed below. Permits: Cambria will obtain drilling permits for all borings from SJCEHD and encroachment permits from the City of Stockton for the borings that are proposed in the sidewalk along West Charter Way. Shell has an access agreement with the owners of the adjacent Best Western property located at 550 West Charter Way for the boring proposed on that property. Site Safety Plan: Cambria will prepare a Site Safety Plan for field work. Utility Clearance: Cambria will mark proposed boring locations and will clear the locations .� through Underground Service Alert prior to drilling. In addition, Cambria will retain a private utility locator to clear the locations. Soil Borings and Sampling: A Cambria geologist will supervise the drilling, and encountered soils will be logged continuously in all the borings using electronic CPT equipment. Borings CPT-12, CPT-13, CPT-17, and CPT-18 will be advanced to 100 fbg, and borings CPT-14, CPT-15, and CPT-16 will be advanced to 40 fbg to log soil lithology. Soil samples will be collected from borings CPT-14, CPT-15, and CPT-l7 at depths of approximately 20, 30, and 40 fbg for chemical analyses and field screening for organic vapors using a photo-ionization detector. In addition, Cambria will collect a soil sample from CPT-17 at approximately 50 fbg. No soil samples will be collected from soil borings CPT-12, CPT-13, CPT-16,or CPT-18. Cambria will collect at least one groundwater sample from borings CPT-14,CPT-15, and CPT-16 at depths between 20 and 40 fbg (the screened intervals of wells MW-8 and MW-9) using CPT sampling equipment. Cambria will target coarse-grained zones in this depth range for water sampling,and exact sampling depths will be determined in the field based on soil types. Cambria will also collect groundwater samples from borings CPT-12, CPT-13, CPT-17, and CPT-18. In each location, samples will be collected at depths of approximately 50, 65, 70, 75, and 90 fbg, correlating to the groundwater samples collected during previous investigations. The exact 4