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CAMBRIA The groundwater chemical analytical data are summarized in the well concentrations table in Blaine's report (Appendix C) and in Table 3 Benzene and MTBE results are presented on Figure 3 Laboratory analytical data are included in Blaine's report(Appendix C) SENSITIVE RECEPTOR SURVEY ADDENDUM Cambria issued a sensitive receptor survey in the January 11, 2002 Fourth Quarter 2001 Groundwater Monitoring/Site Investigation Report and Receptor Survey Four water production wells (three domestic and one municipal) were identified through a review of Department of Water Resources (DWR) records The closest well to the subject site is a domestic well located approximately 450 feet northwest of the site A second domestic well is located 850 feet northeast of the site Cambria performed a door-to-door survey to determine the status of these wells i During the survey, Cambria spoke to residents at both locations and confirmed that neither of these domestic wells is in use Both residences are serviced by City water and the wells are either not functioning or not being used • CONCLUSIONS Soil results from the current investigation further delineate the lateral extent of petroleum hydrocarbons and MTBE southeast of the subject site Wells MW-8 and MW-9 were installed to assess the lateral extent of impacted groundwater southeast of the subject site Groundwater samples collected from these wells provide delineation of benzene and MTBE The TPHg detections in these two wells, according to the lab report, do not exhibit a typical gasoline pattern and may not be related the petroleum hydrocarbon detected beneath the Shell site RECOMMENDATIONS Cambria recommends gauging and sampling wells MW-1 through MW-11 and VEW-2 quarterly Groundwater samples from the wells will be analyzed for TPHg, BTEX, and MTBE quarterly and for fuel oxygenates ETBE, TBA, DIPE, and TAME annually in the third quarter, according to the existing sampling schedule 0854 6