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1 <br /> 1 <br /> 16 November 1992 <br /> (GeoAudit CV43C5-1. 61) <br /> Page 3 of 3 <br /> beneath the former UST locztion to a depth of 50 to 60 feet. The <br />' lateral extent of contamination is unknown. According to the SJ <br /> PHS/EHD, the depth to groundwater in the Spring of 1986 was <br /> approximately 35 - 40 feet. Therefore the PHS/EHD will most likely <br />' require assessment of the lateral extent of soil contamination and <br /> the potential for groundwater contamination. A minimum of one <br /> groundwater monitoring well will be required to determine whether <br /> groundwater is contaminated. If groundwater contamination is <br /> detected, two additional wells will be required to determine the <br /> groundwater gradient and flow direction and to enable subsequent <br /> monitoring. <br />' Lateral assessment of soil contamination could be performed either <br /> by the installation of additional soil borings or by overexcavation <br /> and soil removal. The latter technique would also involve <br /> remediation of the contaminated soil , and SJ PHS/EHD would <br /> therefore require an Executive Summary and a Public Comment period. <br /> This technique is suitable only for contamination that is shallower <br /> than approximately 30-35 feet. Remediation of deeper contamination <br /> would probably require in-situ treatment. <br /> f <br /> I' <br />