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• CAMBRIA petroleum hydrocarbons as gasoline (TPHg), total petroleum hydrocarbons as diesel (TPHd) and total petroleum hydrocarbons as motor oil (TPHmo), and benzene, toluene, ethylbenzene, and xylenes (BTEX) TPHmo was detected in the soil at concentrations up to 8811 parts per million (ppm), TPHg was detected in the soil at concentrations up to 298 ppm, benzene was detected in the soil at concentrations of 0 044 ppm It appears that additional soil was excavated from the UST pit and additional samples were collected and analyzed These samples did not contain detectable levels of TPHg, TPHd, TPHmo, and BTEX 1989 Pre-Tank Replacement Site Assessment Results Report In 1989, Aegis Environmental Consultants (Aegis) of Roseville, California conducted a pre-tank replacement subsurface investigation A total of 12 soil borings were drilled to assess subsurface conditions of soil in the vicinity of the existing underground storage tank (UST) pit and the new UST location The soil borings were drilled to 21 5 feet below grade (fbg) Groundwater was not encountered in any of the borings One soil sample from each boring (B-1 through B-4) drilled adjacent to the existing UST pit . and four soil samples (B-5 through B-8) from the borings drilled in the new UST location were submitted for laboratory analyses TPHg, TPHd, TPHmo were not detected in any soil sample collected BTEX were also not detected in soil samples collected from the borings except for low concentrations of benzene at 0 07 ppm benzene at 20 fbg in boring B-4 A summary table of the chemical analytical results and a site map from this investigation are included in Appendix B 1990 Tank Closure Results Report (Preliminary Report): During May 1990, two 5,000 gallon USTs, one 7,500-gallon UST, and one 10,000-gallon UST were removed from the site and replaced with three 12,000-gallon double walled fiberglass USTs, installed in a different location Soil samples collected during the tank removal (by Aegis) indicated that soil beneath the former USTs had been impacted by petroleum hydrocarbons TPHg concentrations ranged from none detected to 4,300 ppm Benzene concentrations ranged from none detected to 10 ppm A summary table of the chemical analytical results and a site map from this investigation are included in Appendix B 1991 Monitoring Well Installation Results Report- During July 1990, Aegis installed three groundwater monitoring wells (MW-1 through MW-3) and two vapor extraction wells (VEW-I and VEW-2) A total of seven soil samples from the five borings were submitted for chemical analyses TPHg was only detected in one soil sample collected from boring VEW-1 at 10 fbg at a concentration of 1 2 ppm Benzene was detected in three of the soil samples at 0837 4