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Our conclusion, based on this limited investigation, is that gasoline contamination extends to depths <br /> that preclude backhoe excavation. With larger excavation equipment, it might be possible to enlarge <br /> the excavation sufficiently to remove the contaminated soil. Site remediation could then be achieved in <br /> a matter of days. However, a larger excavation could jeopardize the integrity of the building, and <br /> contamination may extend under the building itself. Further remediation might then be required using <br /> on-site(underground)methods. The sandy nature of the soil is amenable to these methods. <br /> RECOMMENDATIONS <br /> It is our understanding that you wish to continue this assessment using drilling technology before <br /> performing any further excavation. Therefore, Upgradient Environmentalwill prepare a new proposal <br /> to drill a soil boring in the southeastern corner of the former tank excavation to determine the <br /> maximum depth of contamination. We will include a provision to collect a groundwater sample if it <br /> appears that groundwater has been impacted, although we feel that that possibility is unlikely. We will <br /> also include the costs to drill additional borings to provide data on the lateral extent of contamiation. <br /> We anticipate submitting our proposal in mid-December. <br /> If you have questions, please contact our office. <br /> Sinc rely, <br /> Victor B. Cherven, Ph. D. C <br /> \S�E4ED Gf 0�0 <br /> President ����o�e. CyF�`��� 111 <br /> Z <br /> enclosure No.3475 <br /> cc: Steve Sasson, EHD OF CAV* <br /> I <br /> I <br />