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e <br /> 0 i <br /> SMTBE, respectively The gioundwatet sample collected from monitoring <br /> well MW-13 also contained 100 ppb TBA Groundwatei samples collected <br /> from shallow monitoring wells MWA, MW-2 and MW-15 did not contain <br /> concentrations of any compound above DHS MCLS for drinking water <br /> None of the wells screened below 19-feet bgs contained any compound at <br /> concepti ations exceeding DHS MCLS However, various compounds w ei e <br /> detected in groundwater samples collected from all of these wells at <br /> concentrations below DHS MCLS including MTBE, TBA, PCE and 1 ,2- <br /> dichloiopropane In addition, ethanol was detected in groundwater <br /> samples collected from three of these deeper wells The highest ethanol <br /> concentration was 58,000 ppb in the groundwater sample collected fi om <br /> monitoi ing well MW-12 <br /> Groundwater in the shallow zone (less than 19-feet bgs) appealed to flow <br /> primarily to the northwest beneath the site at a giadient of appioximately <br /> 0 012-feet/foot G oundwatei in the 55-feet bgs to 70-feet bgs zone <br /> flowed to the east at a gradient of 0002-feet/foot <br /> 2__L2__.JuIy, August and Sente.nabei 2000 _.Domestic WellSa�n(Y <br /> In July and August 2000, and continuing to date, ASE has been collecting <br /> groundwater samples from numerous domestic water wells in the site <br /> vicinity To date, ten domestic wells and one irrigation well north of the <br /> site have detectable MTBE concentrations as high as 82 ppb In addition, <br /> two additional wells have concentrations of 1 ,2-dichloroethane (1,2-DCA) <br /> but do not have concentrations of MTBE ASE is continuing to sample <br /> wells in the site vicinity and will be issuing a report on this portion of the <br /> project shortly <br /> 2. 11 August 2000 Feasibility Testsand Interim Remetdiation System <br /> Workplan <br /> In August 2000, ASE installed one extraction and one air sparge well at t h e <br /> site ASE also conducted a step drawdown pumping test, a constant rate <br /> pumping test, an air sparging test and a dual-phase extraction test at the <br /> site Results of these feasibility tests can be found in ASE's workplan titled <br /> "Workplan foi the Installation of an Interim Remediation System" dated <br /> September 5, 2000 <br /> Frank's One Stop Workplan — September 2000 <br /> -6- <br />