Laserfiche WebLink
Monoft a�Aso Un <br /> Working to Restore Nature <br /> JUSTIFICATION FOR CLOSURE <br /> It is RESNA's opinion that adequate site investigation and remediation have been <br /> performed and the soil and groundwater conditions at the site warrant case closure This <br /> is based on the following <br /> o Ongoing sources of hydrocarbons have been removed from the site <br /> Approximately 500 cubic yards of impacted soil were removed (approximately <br /> 623 pounds of gasoline) <br /> o Approximately 0 014, 0 OS, 153 and 2.49 pounds of benzene, toluene, <br /> ethylbenzene, and total xylenes, respectively, remain in soil in the vicinity of <br /> the former tank cavity between 15 to 40 feet bsg <br /> o Groundwater monitoring was performed for an appropriate amount of time <br /> to adequately document site conditions, and one monitoring well has been <br /> downgradient of the former gasoline tanks Groundwater beneath the site is <br /> not currently affected by hydrocarbons, and TPHg and BTEX concentrations <br /> have been below detection limits for four consecutive quarters. The direction <br /> of groundwater flow has been consistently to the southwest to northeast with <br /> the exception of the first groundwater sampling conducted in July 1993 <br /> 40" (gradient toward the south) <br /> o The depth to groundwater has fluctuated between 86 to 88 feet below surface <br /> grade. <br /> o Because the mass of hydrocarbons remaining in place is low and the <br /> hydrocarbons are not currently impacting groundwater, it is our opinion that <br /> no additional remediation is warranted. <br /> Based on the cumulative results of our environmental investigation, RESNA recommends <br /> site closure Once the site closure request has been approved,we recommend that the wells <br /> be destroyed <br /> • 0504gtak/123M 01 6 <br />