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} . Results of Subsurface Investigation Colberg Boat Works Wage 3 techniques, 12 of the soil samples collected were submitted to Sparger Technology, Inc , a state- certified analytical laboratory, for chemical analyses The monitoring wells were constructed with 2-inch-diameter PVC casing and screen The monitoring wells were developed by bailing to remove sediment from the well casing The top-of- casing (TOC) elevations for the monitoring wells were surveyed relative to monitoring wells MW-1 and MW-5 TOC site datum of 10 and 11 feet msl, respectively The TOC elevation of the monitoring wells and groundwater level data are summarized in Table 1 Figure 3 represents a potentiometnc surface map of the site Monitoring well installation logs, including lithologic descriptions, well construction details and results of soil sample field screenings are provided as Appendix B The depth to static groundwater level in the monitoring wells was measured, and the monitoring wells were purged and sampled on July 29, 1997, according to Apex's SOP Well development, decontamination and purge water is temporarily stored on site in labeled Department of Transportation approved 55-gallon drums pending receipt of the analytical results and proper disposal arrangements The groundwater samples were submitted, under Cham-of-custody documentation, to Sparger Technology, Inc , a state-certified analytical laboratory SOIL AND GROUNDWATER ANALYSES AND RESULTS The 12 soil samples selected on the basis of SJCEHD's direction and field screening were analyzed for 1) total petroleum hydrocarbons, as gasoline (TPHg)by modified EPA Method 8015, and 2)benzene, toluene, ethylbenzene, xylenes (BTEX) In addition, soil samples collected from MW-4 through MW-6 were also analyzed for total petroleum hydrocarbons, as diesel (TPHd) by modified EPA Method 8015 Analytical results of soil samples are summarized in Table 2 Laboratory analytical reports and chain-of-custody forms are included in Appendix C Six groundwater samples were collected and analyzed for 1) TPHg by modified Method 8015, 2) BTEX, and 3) methyl-tert-butyl-ether (MTBE) by EPA Method 8020 The groundwater sample with the highest MTBE concentration was also analyzed by EPA Method 8260 to confirm the EPA Method 8020 MTBE concentration Analytical results of groundwater samples are summarized in Table 3 Laboratory analytical reports and chain-of-custody forms are included in Appendix C RESULTS AND CONCLUSIONS Sediments encountered in the soil bonngs consisted of predominantly brown to olive gray fine silty clays and clayey silts Dark brown fine-grained sandy silt was encountered at a depth of approximately five to seven feet below ground surface (bgs) of monitoring well boring MW-6, 10 C UCSPROJ- 100 00I\INVSTRPT WPD