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MW-4A Nearby extraction well EW-7A was ND for Well EW-7A is at least 20 feet down- <br /> MTBE when last sampled; therefore, MW-4A gradient of MW-4A.The wells had two <br /> (Continued) is probably ND too. contemporaneous sampling events with <br /> results as shown below. MTBE <br /> concentrations are in micrograms per <br /> liter(<1 indicates less than one <br /> microgram per liter detected). <br /> TEW-7A MW-4A <br /> -- <br /> J 11/19/2009 71� <1 (ND) <br /> 12/27/2010 7.1 89 <br /> 6/29/2011 <1 (ND) <br /> The table shows that there is no obvious <br /> correlation of contaminant <br /> concentrations between the two wells; <br /> therefore,the EHD concludes thatthere <br /> is a reasonable probability that MTBE <br /> contamination remains in the area <br /> around MW-7A and the well must be <br /> destroyed by removing the well contents. <br /> MW_413 The groundwater monitored by the well <br /> has been ND for MTBE. This deeper- <br /> screened well passes through <br /> contaminated water monitored by MW- <br /> 4A,therefore the evaluation of issues <br /> related to MW-4A apply to well MW-4B. <br /> Variance requested to be allowed to destroy <br /> well by pressure grouting due to: <br /> Traffic safety, EHD found the well is located in a hotel <br /> parking lot with no unusual traffic issues. <br /> Business convenience. Removal of the well will cause some <br /> inconvenience for the hotel and guests, <br /> but no more than when the well was <br /> installed. <br /> Page 2 of 9 <br />