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• • Levine-Fricke-Recon <br /> • The conclusions from the review of the lithologic and well construction log for <br /> monitoring well MW-21 indicate that further investigation is needed within the <br /> B zone to evaluate whether MW-21,is allowing communication of relatively high <br /> concentrations of detected Hazardous Substances between the upper and lower <br /> discrete sand layers within the B zone. LFR is currently evaluating viable methods <br /> to obtain discrete groundwater samples from each of the three water-bearing sand <br /> layers within the B-zone aquifer. The chemical analysis of these discrete samples <br /> will aid in determining if these discrete layers, specifically the upper water-bearing <br /> sand layer, have different groundwater chemistry. LFR will suggest specific <br /> investigative methods for the further evaluation of MW-21 and propose a schedule <br /> for such activities in forthcoming correspondence. <br /> • All of the LC Site groundwater monitoring wells, with the possible exception of <br /> monitoring well MW-21, have been determined to be sound and will be retained in <br /> the periodic monitoring program. LFR recommends that monitoring well <br /> redevelopment be performed on all of the LC Site groundwater monitoring wells <br /> (including MW-21) as described in Section 3.1. <br /> 39661NT.DOC:SRL <br /> Page 9 <br />