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-. _ . <br />' ~ <br />I - 6 - <br />' i It is difficult to evaluate the origin of the water which <br />caused the saturation; much of it was a result of the spring <br />i~ <br />thaw and the exceptionally high rain fall during that part of <br />the year. It cannot be excluded that some water was seeping <br />~~ locally from the outcrop of the coal seam. Much of the water, <br />i~ as observed during the 1980 spring season, occurred at a higher <br />I <br />' I~ elevation above the coal seam as could be observed on a slide <br />~' which developed immediately west of the proposed mine entries. <br />' For all practical purposes, it has to be assumed that a <br />' complete saturation of the area can occasionally develop; it <br />i. <br />" can be expected that the saturation would develop during a <br />spring season and during a year with unfavorable climatic con- <br />, I ditions. <br />i <br />' As there have been no data available on the fluctuation of <br />~i the ground water surface later in summer and fall of a year, <br />we recommended that a series of piezometers be installed along <br />' i;~ the center lines of the proposed mine entries. Two piezometers <br />~; were installed at each entry, one of them close to the proposed <br />' I' portal and the other farther to the south. They were installed <br />in September, 1980; to this date, only two readings were made <br />' -- on ground water in these piezometers and in piezometers in- <br />stalled in borings E-1 to E-3 and A-8. Data obtained are <br />I presented in Table 1; ground water levels are also plotted in <br />~ Profiles Along Entries 1-5, Plates 2 - 6. It is evident from <br />these data that even as late as in October, ground water was <br />' it identified in several piezometers in profiles along the entries; <br />this occurrence appears to be limited to some locations only. <br />' j It is also evident that, without some remedial measures <br />i <br />' such as drainage, ground wa=er occurrence can be expected at <br />' various depths at any time of the year. <br />i <br />' ~~ It is desirable to continue to monitor ground water levels <br />j in all piezometers which '_^ave been installed to obtain more <br />1 <br />~«.~ ~a.~.l..~..K <br />