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locations are plotted on Figure 2. Field methodology and analytical results are discussed in detail in RESNA's Interim Problem Assessment Report, dated January 13, 1992. At the request of PHS/EHD, RESNA prepared and submitted a Soil Remediation Workplan dated July 22, 1992. Soil excavation was proposed the soil remediation method for the site. In correspondence August 17, 1992, PHS/EHD concurred excavation of hydrocarbon contaminated soil was the preferred method of remediation The site's station building and garage were demolished in December 1994, in part to facilitate the removal of hydrocarbon contaminated soil which is suspected beneath the station building. The demolition of the station building was requested in PHS/EHD correspondence dated July 7, 1994. A required demolition asbestos survey conducted previously on the station building, determined the presence of asbestos containing materials. E. T. Abatement, of Modesto California, properly removed and disposed of the site's suspected asbestos containing materials on November 11, 1994. On February 14 through 17, 1995, approximately 1,400 cubic yards of soil were excavated from the vicinity of the former underground fuel storage tanks. The extent of the excavation is depicted on Figure 2. Analytical results of excavation confirmation samples indicate that the majority of impacted soil has been removed from the southern, southwestern, and eastern portions of the excavation. Field observations indicated contamination along the eastern portion of the northern sidewall appeared to be limited to the saturated zone. The northwest portion of the excavation was obviously discolored and impacted above and below the water table, however due to the close proximity of an adjacent structure and underground utilities, in addition to the instability of the excavation sidewalls, the excavation was limited in the northern and western directions. Field methodology and analytical results are discussed in detail in Smith Environmemntal's October 24, 1995 Soil Excavation Report, dated October 24, 1995. To date, analyses of groundwater samples collected from the site monitoring wells indicate the lateral extent of the dissolved hydrocarbon plume associated with the former fuel storage tanks has been essentially defined, except to the north. The groundwater flow has been determined to be consistently in the westward direction RESPONSE TO PHS/EHD NOVEMBER 15, 1995 CORRESPONDENCE Below are responses prepared to address comments contained in PHS/EHD correspondence dated November 15, 1995 regarding Smith Environmental's October 24, 1995 Soil Excavation Report Comment A total of 15 soil samples were collected to characterize residual soil contamination yet only 11 underwent analysis and were included in Attachment 1 of the Soil Excavation Report. 15008 i\sxtt-0995.noc 2 • SNITH