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i <br /> and 38 ppb MTBE, respectively The groundwater sample collected from <br /> monitoring well MW-13 also contained 100 ppb TBA Groundwater <br /> samples collected from shallow monitoring wells MW-1, MW-2 and MW-15 <br /> did not contain concentrations of any compound above DHS MCLS for <br /> drinking water <br /> None of the wells screened below 19-feet bgs contained any compound at <br /> Iconcentrations exceeding DHS MCLS However, various compounds were <br /> detected in groundwater samples collected from all of these wells at <br /> I concentrations below DHS MCLs including MTBE, TBA, PCE and 1 ,2- <br /> dichloropropane In addition, ethanol was detected in groundwater <br /> samples collected from three of these deeper wells The highest ethanol <br /> I concentration was 58,000 ppb in the groundwater sample collected from <br /> monitoring well 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 to 70-feet bgs zone flowed to t h e <br /> feast at a gradient of 0002-feet/foot <br /> 2..12 1. l_y and August 2000 Domestic Well Samnitng <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, nine (9) domestic wells and one (1) irrigation well <br /> north of the site have detectable concentrations of MTBE as high as 82 <br /> ppb ASE is continuing to sample wells in the site vicinity and will be <br /> issuing a report on this portion of the project shortly Bottled drinking <br /> water is currently being supplied to all residences that receive water from <br /> affected drinking water wells <br /> 3 . 0 PROPOSED SCOPE OF WORK (SOW) <br /> In order to design an effective remediation system, a number of tests were <br /> required and additional wells were needed The scope of work to perform <br /> these tests were as follows <br /> 1 ) Install (1) extraction well in order to conduct needed pump a n d <br /> dual-phase extraction tests <br /> 2 ) Install one air sparging well at the site <br /> 3 ) Conduct step drawdown pumping tests <br /> Frank's One Stop Interim Remediation System Workplan — September 2000 <br /> I -6- <br />