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NO FURTHER ACTION REQUEST Boyett Petroleum 419 S.Main Street Manteca, CA t1.0 INTRODUCTION ' This No Further Action Request (NFAR) was prepared by Condor Earth Technologies, Inc. (Condor) for the Boyett Petroleum facility located at 419 S. Main Street(site) in Manteca, California (Figures 1 and 2, Appendix A).This report was prepared at the request of Dale Boyett of Boyett Petroleum(client). ' 2.0 SITE BACKGROUND On November 20 and 21, 1996, soil sampling was conducted at the site by WHF, Inc., (WHF) under the direction of Robert McClellon of the San Joaquin County Public Health Service, Environmental Health Division (SJCEHD). One soil sample was collected from beneath each of the site's three existing fuel dispensers at a depth of approximately two feet below the dispenser piping. Four discrete soil samples ' were collected to characterize approximately 44 cubic yards of stockpiled soil from demolition and retrofit activities at the site. The four discrete samples were composited into two soil samples for laboratory analyses. The soil samples collected from both the dispenser locations and the soil stockpile ' were analyzed for total petroleum hydrocarbons quantified as gasoline (TPH-G); for benzene, ethyl benzene,toluene, and total xylenes(BTEX); and for methyl tertiary-butyl ether(MTBE). . On October 5, 1998, WHF completed two vertical soil borings, SB-1 and SB-2, to a maximum depth of ' 18 feet below ground surface (bgs) near the fuel dispenser island. Three soil samples were collected for laboratory analyses from each boring at depth intervals of 4-6 feet, 9-11 feet, and 16 feet. One groundwater sample was collected from each boring from a depth of 18 feet for laboratory analyses. On August 277 and 30, 1999, WHF completed four soil borings. The borings, which varied in total depth from 26.5 to 36.5 feet bgs, were subsequently converted into monitoring wells MW-1 through MW-4. ' The depth to groundwater was reported to be at approximately 18 feet bgs. Quarterly groundwater monitoring at the site began in the fourth quarter of 1999. ' From December 20 through 22, 2000, WHF completed four soil borings. The borings, which varied in total depth from approximately 20 to 25 feet bgs, were subsequently converted into monitoring wells MW-5 through MW-8. The depth to groundwater was measured at approximately 17 feet bgs. Three soil ' samples were collected from each boring at depth intervals of 16-16.5 feet, 20-21.5 feet, and 26-26.5 feet for laboratory analyses. On February 2, 2001, WHF advanced two cone penetration test (CPT) borings at the site. CPT-1 and ' CPT-2 were completed to depths of 76 and 76A feet bgs, respectively. Both borings were terminated due to refusal. Beds of clay were encountered in CPT-1 at depths of 20 to 24.1 feet and 50.2 to 57.6 feet bgs. In CPT-2,beds of clay were encountered at depths of 23.8 to 26.4 feet, 49.7 to 56.4 feet, and 62.7 to 66.9 ' feet bgs. On April 25, 2001, WHF completed a deep monitoring well, MW-9, to a depth of 50.5 feet bgs. The ' screened interval for the well was installed at approximately 40.5 to 50.5 feet bgs. The depth to CONDOR 1