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V � Mr. Vidal Pedroza March 23, 2000 Page 5 of 6 feet bgs, and sandy silt in soil samples collected between 14 and 20 feet bgs. • Evidence of groundwater was encountered at approximately 14 feet bgs in boring SB 1 and SB2, and approximately 10 feet bgs in boring SB6. However, only boring SB 1 yielded enough water to collect a groundwater sample. • Except for low FID readings in the samples collected at 1 i feet bgs and 14.5 bgs in boring SB4, no evidence of petroleum hydrocarbons were present in the soil. • TPHg and xylenes were detected at 1.4 ppm and 0.016 ppm, respectively, in the soil sample collected from 14.5 feet bgs in boring SB4. • TPHd was detected at 8.6 ppm in the soil sample collected from 14.5 feet in boring SB5. • Total lead was detected in the soil at concentrations ranging from 5.3 ppm to 15 ppm. • TPHd was detected at a concentration of 110 ppb in the groundwater sample collected from boring SB 1. No other pedtroluem hydrocarbon constituents were detected. • No MTBE was detected in any soil or groundwater samples. 5.2 Conclusions Petroleum hydrocarbon impact to the soil and groundwater at the site does not appear to be significant. Only soil samples collected from borings SB4 and SB5 at a depth of 14.5 feet bgs contained very low levels of petroleum hydrocarbon constituents. No benzene or MTBE was detected in any soil or groundwater sample collected at the site. Total levels detected in the soil appear to be consistent with naturally occurring background levels. Based upon the results obtained from this investigation, no significant impact to the environment from an unauthorized release appears to exist. Closure in place of the USTs and piping appears to be warranted. 6.0 CERTIFICATION Signature of this report certifies that Ground Zero's professional services have been performed, our findings obtained, and our conclusions prepared in accordance with customary principles and practices in the fields of environmental science and engineering. No hazardous wastes were generated as a result of the investigation. No waste from this investigation remains on site. The analytical laboratory will ultimately dispose of collected soil and water samples. This investigation was performed under the direct supervision of John P. Lane, who has reviewed and approved this report. The methods and procedures employed in the development of this report conform to minimum industry standards. G:IData1GROUNDZE1WalerfrontlSubsurfsum.doc 5