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Tduring <br /> the well was installed. <br /> iderable amount of <br /> rking apart from the well. <br /> Trend analysis shows MTBE will not beis is based on data collected <br /> detected in MW-20A water samples byand may not be applicable <br /> February2011, <br /> to natural conditions,without GWE. <br /> Nearby extraction well EW-10A was ND for The wells had two pairs of <br /> MTBE when it was last sampled, therefore contemporaneous sampling results as <br /> MW-20A is probably ND, shown below. Concentrations are in <br /> micrograms per liter: <br /> EW-10A MW-20A <br /> 11/19/2009 <br /> <1 (ND) 150 <br /> 12/28/2010 <br /> <1 (ND) 22 <br /> Extraction well EW-10A is approximately <br /> 82 feet obliquely down gradient of <br /> monitoring well MW-20A,and the table <br /> above shows that there is no correlation <br /> between an"ND" in EW-10A and the <br /> contemporaneous contaminant <br /> concentration in MW-20A. <br /> MW-206 Groundwater monitored by the well is ND <br /> for MTBE,this deeper screened well <br /> passes through the contaminated water <br /> monitored by MW-20A;therefore,the <br /> evaluation of issues related to MW-20A <br /> apply to well MW-2013. <br /> Interval through impacted zone has a grout The Nebraska Well Grout Study found <br /> seal between casing and impacted portland cement grouts do not adhere to <br /> groundwater. PVC plastic and a micro-annulus develops <br /> between the cement grout and the well <br /> casing, creating a vertical migration <br /> pathway for groundwater and any <br /> contaminants in the groundwater. <br /> Page 9 of 9 <br />