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RNAL REMEDIATION PLAN 14800 West Frontage Road Manteca California July 6 and ' August 23, 1990 NGA collected depth-to-groundwater measurements and groundwater samples from the eight monitoring wells ("Problem Assessment Report,"dated September 14, 1990, by ' NGA) January 31, 1991 Aegis collected and submitted for analysis groundwater ' samples from the eight monitoring wells ("Quarterly Groundwater Monitoring Report," dated April 18, 1991) A ' total of thirty-two discrete soil samples were collected from the soil stockpile located on site ' July 22, 1991, through October 20, 1992 Aegis collected and submitted for analysis groundwater samples from the eight wells ("Quarterly Groundwater ' Monitoring Report") August 1991 Aegis, with approval from the San Joaquin County Environmental Health Department, used the existing stockpile for landscaping on site November 15, 1991 Aegis supervised drilling of one additional soil boring on site The boring was completed as 4-inch-diameter monitoring well MW-9 ("Problem Assessment Report," dated June 26, 1992) June 26, 1992 Aegis submitted a "Problem Assessment Report," dated June 26, 1992 2.1 Site Description I The site facilities include a station budding, three UST, and retail fuel dispenser islands (Figure 2) fTo date, a total of eight on-site and one off-site (MW-5) groundwater monitoring wells have been installed (Figure 2) Monitoring wells MW-1 through MW-8 are 2-inch-diameter wells Well MW-9 is a 4-inch-diameter monitoring well Boring logs are included in Appendix B A summary of the analytical data is included in Table 2 2.2 Subsurface Utilities Underground utilities are present beneath the site Prior to beginning fieldwork, Underground Service Alert will be contacted and the underground utilities will be marked 90-097A FRP 3-