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r <br /> r <br /> Y7e11 No '2 , located at `tyre south end entrance ramp to , <br /> the <br /> excavation, h<as been partially dug out by excavating, <br /> equipment . This was shown :in' the February 1 , 1990 report! by <br /> Iii.inter and 'Associates. in'=pliot.ographs of the excavation . <br /> These photographs are, not being reproduced herein because of j <br /> the problem of color reproduction. The drilling log of MW <br /> 2 is attached .. On this illustration, the approximate depth <br /> of excavation and-the top, of.the. pipe stub are shown. The <br /> depths cannot ,be accurately fixed because all surveys. used d <br /> an arbitrary referenpe. elevati.on. The bottom of the pipe ex- <br /> cavation and <br /> xcavation" and the -top of the stub were inferred by <br /> correlating the photographs in Figures 10 and 12 of the <br /> 2/1/90 report with the. lithology shown ori the GT1 well log . <br /> Although almost one half of the cemented pipe has been re- <br /> moved, an adequate seal shorild stiII exist and the pipe and <br /> stub will be buried under. about 1.0 feet of soil when the <br /> 1 excavation is refilled . A small amount of grout '.pWar.;ed ..w" <br /> around the base of tl-re pipe stub when it is being filled p <br /> 1 . with grout: could help prevent the establishmerit , of a,conduit P <br /> by channeling. <br /> At Well # 3, the northerly well , the pipe stub and grout. <br /> sheath cannot be seen and the pipe protruding from the f <br /> ground might not be: screw connected to the well pipe . <br /> Therefore', it is recommended that the pipe be dug out until <br /> the cement sheath is located and then tale well be plugged f <br /> with grout and a base cap he poured around the stub . r <br /> With the additional work rioted above, it: is believed that E <br /> the groundwater can be adequately protected by filling the <br /> cas;iricrs with grout . Excavation of tIt o entire: we11 pipe ; <br /> grout sheath, liner etc , is riot believed to be warranted 'by '? <br /> -this writer, and if done ; would riot necessarily 'provide any <br /> more protection , than the methods suggested above . <br /> Very truly yours , ' .. . . <br /> '< " <br /> i 1 <br /> Dennis R. Allen <br /> For: Hunter & .Associates <br /> i <br />