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Results Report for Subsurface Investigation and Second Quarter 1999 Groundwater Monitoring dated June 1, 1999. Apex submitted the Workplan for Limited Subsurface Investigation dated August 6, 1999, proposing the installation of four additional groundwater monitoring wells. On October 28, 1999, Apex supervised the drilling of four soil borings with soil sampling, converting three of the four soil borings into 2-inch-diameter groundwater monitoring wells MW- 4A, MW-7, MW-9, and converting the fourth soil boring (MW-8) into a 4-inch diameter well. The results of all soil and water sampling were documented in the report entitled Results of Limited Subsurface Investigation and Fourth Quarterly Groundwater Monitoring Report dated, November 23, 1999. GROUNDWATER MONITORING Groundwater Levels On January 26, 2000, Apex personnel collected water-level measurements from all nine existing groundwater monitoring wells (MW-1, MW-2, MW-3, MW-4A, and MW-5 through MW-9). All groundwater elevations were measured to the nearest 0.01 foot, referenced to the surveyed top- of-casing elevations, and conducted according to the Apex standard operating procedures (SOP) included as Appendix A. Liquid-level measurements collected to date by Apex are summarized in Table 2. Figure 3 is a groundwater contour map of the shallow water-bearing zone on January 26, 2000. Groundwater Sampling and Analysis On January 26, 2000, Apex personnel collected groundwater samples from all nine existing wells. The samples were submitted, under chain-of-custody, to Sparger Technology, Inc. of Sacramento, California. The laboratory analytical reports and chain-of-custody form are included in Appendix B. All samples were collected according to the Apex SOP included in Appendix A. All samples were analyzed for concentrations of: a) TPH, as gasoline; TPH, as diesel; TPH, as kerosene by modified EPA Method 8015; b) BTEX by EPA Method 8020; and c) five oxygenates by EPA Method 8260. The laboratory analytical reports and chain-of-custody form are included in Appendix C. Analytical results collected by Apex to date are summarized in Table 2 and Table 3. All purged and recovered liquids are stored temporarily on site in Department of Transportation- approved, 55-gallon drums pending removal from the site by a licensed hauler to an appropriate disposal facility.