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No analytes were detected in any soil samples collected from boring SB 1, SB2, or SB3. Analytical results of soil samples are summarized in Table 2. Laboratory reports and chain of custody documentation are included in Attachment B. 4.4 Groundwater Analytical Results The grab groundwater sample collected from boring SB 1 contained non-detectable levels of TPH9, BTEX, and organic lead. No oxygenate additive constituents were detected, with the exception of t- butanol (TBA), which was detected at a concentration of 83 parts per billion (ppb). This level is well below the recommended taste and odor threshold of 2901000 ppb. No Maximum Contaminant Levels (MCLs) have been established for TBA. Analytical results of groundwater samples are summarized in Table 2. Laboratory reports and chain of custody documentation are included in Attachment B. 5.0 CONCLUSIONS AND RECONEWENDATIONS 5.1 Conclusions • Soil beneath the site consists of primarily of lean clay and silt, with some poorly graded sand; • Groundwater was initially encountered at a depth of approximately 10 feet bgs and recovered to approximately 7 feet bgs; • No detectable levels of TPHg, BTEX, organic lead, or gasoline oxygenates additives were found in the soil; • A groundwater sample collected from SBI contained t-butanol at a concentration of 83 ppb, well below the taste and odor threshold level of 290,000 ppb. No other fuel constituents were detected in the groundwater sample. 5.2 Recommendations Based upon field and analytical data collected during this investigation, Ground Zero recommends that the site be closed with no further action required. 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 these investigations. No waste from this investigation will remain on site. The analytical laboratory will ultimately dispose of collected soil samples. This investigation was performed under the direct supervision of John Lane, who has reviewed and approved this report. The methods and procedures employed in the development of this report conform to minimum industry standards. data*oundzelhaleylsummary.doc 4