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In addition, ethanol was detected in groundwater samples collected from <br /> ' three of these deeper wells The highest ethanol concentration was <br /> • 58,000 ppb in the groundwater sample collected from monitoring well <br /> MW-12 <br /> Groundwater in the shallow zone (less than 19-feet bgs) appeared to flow <br /> primarily to the northwest beneath the site at a gradient of approximately <br /> 0 012-feet/foot Groundwater in the 55-feet bgs to 70-feet bgs zone <br /> flowed to the east at a gradient of 0 002-feet/foot <br /> 2 .12 July, August and Sej)ternher 2000 Domestic Well Sam In ing <br /> Between July and September 2000, ASE collected groundwater samples <br /> from 38 domestic and 2 irrigation wells in the site vicinity Ten domestic <br /> wells and one irrigation well north of the site had detectable MTBE <br /> concentrations as high as 82 ppb In addition, two additional wells h a d <br /> concentrations of 1,2-dichloroethane (1,2-DCA) but did not have <br /> concentrations of MTBE <br /> 2. 13 August 2000 Feasibility Tests and ^Interim Remediation SvStem <br /> Workplan <br /> In August 2000, ASE installed one extraction and one air sparge well at <br /> the site ASE also conducted a step drawdown pumping test, a constant <br /> rate pumping test, an air sparging test and a dual-phase extraction test at <br /> the site Results of these feasibility tests can be found in ASE's workplan <br /> titled "Workplan for the Installation of an Interim Remediation System" <br /> dated September 5, 2000 <br /> 14 September 2000 Interim. Remediation System Installation <br /> In September 2000, ASE installed two new groundwater extraction <br /> (recovery) wells at the site and converted three piezometers into <br /> recovery wells A "pump and treat" interim groundwater remediation <br /> system was installed and began operation on September 29, 2000 To <br /> date, this system has recovered over 1,169,200 gallons of hydrocarbon <br /> impacted groundwater, and approximately 30-gallons of gasoline <br /> 2. 1 5 September 2000 Alternative Water Source for_ ITted EraDerxL <br /> In September 2000, each domestic well impacted by MTBE or 1,2-DCA <br /> was disconnected from the home plumbing The home plumbing was <br /> then connected to water tanks, which are regularly filled with water from <br /> Franks One Stop Report - March 2001 <br /> -6- <br />