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' • i <br /> 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 September 2000 Domestic Weil] Sampling <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 system <br /> W orknlan r <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 Segtember 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 /> To date, this system has recovered over 2,154,810 gallons of hydrocarbon <br /> impacted groundwater, and approximately 37-gallons of gasoline <br /> 2. 15 September 2000 Alternative Water Source for Impacted Pron_e rties <br /> In September 2000, each domestic well impacted by MTBE or 1,2-DCA was <br /> disconnected from the home plumbing The home plumbing was then <br /> connected to water tanks, which are regularly filled with water from the <br /> Frank's One Stop Remedial Action Plan — August 2001 <br /> -6- <br />