ARCHIVED REPORTS XR0000721 - Laserfiche WebLink

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Ms. Maria Guensler Exxon Company, U.S.A. September 14, 1993 Page 3 Analytical test results indicate that the soil sample collected from soil boring SB-5 at a depth of 11 feet contained benzene (0.1 ppm) and xylenes (0.05 ppm), and the soil sample collected from soil boring SB-6 at a depth of 11 feet contained benzene (0.011 ppm). Petroleum hydrocarbons were not present in detectable concentrations in the other soil samples. Discussion of Results Over excavation work at the former underground gasoline storage tank location performed on April 11, 1992, appears to have removed soil containing petroleum hydrocarbons. This statement is based on the fact that petroleum hydrocarbons were not detected in soil samples collected in July 1993 from soil borings drilled adjacent to the former underground gasoline storage tank location. Residual concentrations of petroleum hydrocarbons identified in soil samples collected from the sidewalls of the former pump island excavation appear to have volatilized during the time that the excavation was opened. This statement is based on the fact that petroleum hydrocarbons were only detected at slight concentrations in two of the ten soil samples collected in July 1993 from soil borings drilled adjacent to the former excavation. Based on the results of this investigation, Delta concludes that soil remediation has been completed at the site. Final delineation of the petroleum hydrocarbon plume in ground water will proceed following receipt of the laboratory chemical analyses results from samples collected on September 7, 1993. Remarks/Signatures The interpretations contained in this report represent our professional opinions, and are based in part on information supplied by the client. These opinions are based on currently available information and are arrived at in accordance with currently accepted hydrogeologic and engineering practices at this time and location. Other than this, no warranty is implied or intended.