ARCHIVED REPORTS XR0000782 - Laserfiche WebLink

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. CHARACTERIZATION/REMEDIAL STATUS Impacted soil delineated? Lateral Yes Vertical Yes Impacted groundwater delineated? No Current phase of project9 Groundwater monitoring and Assessment Frequency of sampling? Quarterly Current remediation techniques? N/A Soil remediation to progress? No Anticipated start? N/A Anticipated completion? N/A Groundwater gradient9 North-Northeast at 0 0015 ft/ft Dissolved/free product remediation in progress? No Anticipated start? N/A Anticipated completion? N/A CONCLUSIONS: The lateral extent of soil impacts is generally defined with the exception of the capillary fringe The off-site soil impacts are likely due to migration of impacted groundwater away from the site . Off-site upgradient groundwater impacts are delineated by well MW-8 Groundwater sampling results for off-site wells MW-5, MW-6, and MW-9 indicate that the groundwater impacts are undefined downgradient of the site The highest detected dissolved benzene and MTBE concentrations are in well MW-5, located approximately 30 feet downgradient of the USTs RECOMMENDATIONS: IT recommends preparing a workplan for further groundwater investigation that includes a groundwater grab sampling program to further delineate the shallow groundwater impacts The grab sample data will be evaluated prior to proposing monitoring well locations The tentative schedule for further assessment is 1) workplan submittal in the fourth quarter 2001, 2) obtaining required access agreements and permits during the fourth quarter 2001 or beginning of the first quarter 2002, and 3) implementation of the assessment during the first quarter 2002 CONSULTANT: IT Corporation i 1205/822125 lba doc 3 10/18/01