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2.0 HISTORICAL AND 2004 SITE ASSESSMENT ACTIVITIES Assessment of petroleum hydrocarbon impact was initiated in June 1990 Several consultants have been involved in environmental investigations completed at this site The following is a summary of environmental assessment activities conducted to date Locations of all soil borings and wells are included on Figure 2 Histoncal information regarding soil boring depths and well construction details are summarized in tables provided in Appendix A Soil boring logs, well details, and California Department of Water Resources (DWR) well completion and destruction forms for the 2004 site assessment activities are also presented in Appendix A 2.1 Summary of Environmental Investigations • Applied GeoSystems, Inc directed the advancement of borings B-1 through B-5 between June 6 and 8, 1990 • The USTs were replaced in November 1990 Roux Associates, Inc collected compliance soil samples between November 7 and 28, 1990 • Resna oversaw the advancement of borings B-6 through B-28 between October 1991 and December 1992 Select bonngs were converted to wells VW-1 through VW-17 • EMCON installed wells VW-18, VW-19, and VW-20 between June 26 and July 5, 1995 . • Delta Environmental Consultants, Inc (Delta) directed the advancement of boring B-32, and the conversion of this borehole to well MW-1, between August 24 and 30, 2000 • Delta also oversaw the advancement of bonngs B-33 through B-38, and the installation of wells MW-2 through MW-9, between August 29 and September 25, 2001 • The fuel dispensers and product piping were replaced during the first quarter 2002 Delta collected compliance soil samples between January 18 and February 11, 2002 • Stratus oversaw the advancement of bonngs B-39 through B-43, the installation of wells MW-10 and MW-12 through MW-15, the installation and subsequent destruction of well MW-11, and the destruction of well VW-15 between February 17 and June 2, 2004 Data associated with the 2004 soil boring and well installation activities are included in this document 2.2 2004 Site Characterization Activities The objectives of the site assessment activities were to • Further assess the lateral and vertical extent of petroleum hydrocarbon impact to soil • Evaluate the presence of groundwater southeast of the site • Further characterize the extent of free product southeast of the site • Destroy damaged well VW-15 To accomplish these objectives, Stratus implemented the following work activities P 1Bp-Arw for UR5161MRepartAamo6100 assessment scm update d" Page 3 5MAW5