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Ms. Conuie Davis/Aggregate Industries - F Street Soil and Groundwater Abatement Re ort <br />Project Number 10010]8 ~nxncorr <br />1 July 6, 2001 <br />Page 5 <br />results are considered preliminary in nature since the samples were not collected from cased <br />and developed groundwater monitoring wells. <br />S. CONCLUSIONS AND RECOMMENDATIONS <br />The following conclusions are made based on information obtained during the soil and <br />groundwater abatement activities. <br />1. Approximately 2,000 cubic yards of contaminated soil was excavated at the site and <br />incorporated into asphalt pavement mix. <br />2. Approximately 83,000 gallons of groundwater/product mixture was pumped from the <br />abatement excavation for off-site treatment and disposal. Approximately 450 gallons of <br />the 83,000-gallon mixture was free-phase product which was reportedly transported to <br />Mesa Oil for recycling. <br />- ~ 3. An additional 20,000 gallons of groundwater was pumped from the excavation and is <br />currently being stored on site. That water will be used for dust suppression in the asphalt <br />plant. <br />_,~ 4. The TEPH concentrations observed in the West Wall North End, Bottom #1, South Wall <br />Middle, Class 7 Run and Stockpile soil samples exceeded the TPH Threshold standazd. <br />The lateral extent of TEPH contamination in soil appeazs to be bracketed by abatement <br />.~ excavation confirmation samples or test pit samples. <br />5. The BTEX and PAH concentrations observed in the soil samples analyzed from the site <br />•-~ did not exceed the Tierl RBSLs. <br />^ <br />6. The BTEX concentrations observed in the groundwater samples collected from the <br />`~ dewatering trench and abatement excavation in May 2001 did not exceed the MCLs. <br />They following recommendations are made based on information obtained during the soil and <br />groundwater abatement activities. <br />1. Groundwater monitoring wells should be installed at the site to monitor groundwater <br />y~ quality at the site. <br />i <br />2. Water quality should be evaluated to obtain information regarding the need for additional <br />groundwater remediation. <br />c <br />3. Impacted soil which may be encountered during future mining activities performed in the <br />spill azea should be handled in accordance with Federal, State and local regulations. <br />id <br />