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i <br /> Item Evaluation Criteria Comments/Discussion <br /> _ _2' <br /> f' <br /> / � 1 <br /> 27n ' s o. <br /> I <br /> Unregistered sharewarevers,on ofpnana <br /> Historical Groundwater Flow Direction <br /> First Quarter 2003 to Fourth Quarter 2004 <br /> 2 10 Stratigraphy Sediments beneath the site consist primarily of <br /> silt, clay and silty sand with interbedded sand <br /> lenses to a maximum explored depth of 40 feet <br /> below grade fb <br /> 2 11 Preferential Pathways Analysis Preferential groundwater flow in utility trench <br /> • backfill does not appear likely at this site as <br /> DTW is below any likely utility excavations <br /> 2 12 Other Pertinent Issues N/A <br /> 3 Remediation Status <br /> 3 1 Remedial Actions Taken Leaks associated with first generation USTs were <br /> likely the primary source of the hydrocarbon <br /> impact In 1991, one 5,000-gallon UST, two <br /> 10,000-gallon USTs, one 1,000-gallon used-oil <br /> UST,product lines, four hydraulic hoists, one 15- <br /> gallon fluid tank, a grease trap and an oil/water <br /> separator were removed of and disposed at a <br /> Chevron approved facility Additionally, <br /> approximately 9990 cubic yard of hydrocarbon <br /> impacted soil was removed and disposed of at a <br /> Chevron approved facile <br /> 3 2 Area Remediated Former USTs, fuel dispensers, and fuel piping <br /> have all been removed and upgraded Soil <br /> around the former USTs has been excavated <br /> 3 3 Remediation Effectiveness The primary source of hydrocarbon impact <br /> appears to have been successfully removed <br /> 4 <br />