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addition, ethanol wgroundwater <br /> . tion, eth as detected n 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 September 2000 Domestic Welles limon. <br />' Between July and September 2000, ASE collected groundwater samples <br /> from 38 domestic and 2 irrigation wells in the site vicinity (Figure 4) Ten <br /> domestic wells and one irrigation well north of the site had detectable <br /> MTBE concentrations as high as 82 ppb In addition, two additional wells <br /> had 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 SystemI <br /> Workplan <br /> In August 2000, ASE Installed one extraction and one air sparge well at t h e <br /> site (Figure 3) ASE also conducted a step drawdown pumping test, a <br /> constant rate pumping test, an air sparging test and a dual-phase <br /> extraction test at the site Results of these feasibility tests can be found in <br />' ASE's workplan titled "Workplan for the Installation of an Interim <br /> Remediation System" dated September 5, 2000 <br /> 2. 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 recovery <br /> wells A "pump and treat" interim groundwater remediation system was <br /> installed and began operation on September 29, 2000 (Figures 3 and 5 ) <br /> The system was turned off on February 28, 2002, and at that time, t h e <br /> system had recovered 3,177,560 gallons of hydrocarbon impacted <br /> groundwater, and approximately 131-gallons of gasoline <br /> 215 Sep-tember 2000 Alternative Water Source fox Impacted Properties <br /> In September 2000, each domestic well impacted by MTBE or 1,2-DCA was <br /> Idisconnected from the home plumbing The home plumbing was then <br /> Frank's One Stop Workplan — September 2003 <br />