SITE INFORMATION AND CORRESPONDENCE

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' ?ecfmics 2nc. �"� Page 2 �operties Summary Report Project No. 8.2 February 28, 1997 4. Lead is either below test method detection limits or is present at extremely low concentrations. 5. Monitoring wells in the up-gradient (MW-1 & 3) and down-gradient (MW-4) direction of groundwater flow from the former UST location do not contain components of gasoline. 6. Groundwater elevations have only fluctuated approximately one foot during the monitoring events since 1987. The average groundwater elevation is about 88.5 feet above mean sea level (MSL) or about 11.5 feet below ground surface(BGS). 7. Groundwater gradient has consistently flowed to the southwest with an average slope of 0.003 ft/ft. It is concluded that a minor amount of residual gasoline remains in the soil around the former tanks which is continuing to leach into groundwater and be transported to the immediate down- gradient well (MW-2) where it is detected during the monitoring events. The rate of gasoline leaching into groundwater, however, is slow enough that the groundwater plume appears to be stere. Even thou 'has not been monitored since 3unq.: , it - _ Wit. groundwater impacted by gasoline compounds does not migrate off site and is in a shrinking mode. The site has been approved for cleanup under the UST Claim No. 006499 in the amount of $180,000 (1987 estimate of costs). This figure has escalated to about $240,000 in 1997 , due to prevailing inflation rates since 1987. This is a priority Class C Claim, awaiting funding. Approval is expected this year. The data clearly indicates that the minor amounts of hydrocarbon residuals are diminishing and are not migrating off-site. With the source of contamination long since removed 16 years ago, the bioremediation process will continue to attenuate the residual gasoline and eventually return the site conditions to non-detect levels (See data sheets). We strongly suggest that utilizing UST cleanup funds to perform engineered remediation at this site is a gross waste of funds that should be directed to cleanup sites that pose a real threat public health or the environment. This site does not warrant further expenditure for corrective action work. It is neither practical nor cost-effective. In view of the forgoing, it is recommended that the files for this site be reviewed and this site be considered for closure.