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. 1.0 INTRODUCTION <br />xxxa:.,n;,o:a::r:r~,~;:~y;:rx~ox:;.se.:.:.n.~:::r:s~~:..w.¢:;~~xe.e:-.~xx'rrx:~x:':x~s~::nM ~::s;.a~;::c:u'sx:na;r:;:s::::~::::x~:a ;~:x~~rircx:':sz^;r.:;x:xrsa-~..~~.:::u:'s:a::<xxxd-:::zaasasY <br />This report presents the results of an aquifer characterization of the Rollins Sandstone in the area <br />of the Roadside Mine located three miles east of Palisade, Colorado. Determination of aquifer <br />characteristics was achieved by installing two surface wells (UTL well and N-Decline well) and <br />two subsurface wells (RSN well and RSS well). The RSS well was installed underground in the <br />Roadside South Mine located on the south side of Interstate 70. The RSN well was installed north <br />of Interstate 70 in the Roadside Nortlt Mine. The borings were located m areas that are beneficial <br />to the Roadside Mine for future groundwater monitoring. Each boring was drilled into and <br />through the full extent of the Rollins Sandstone with the exception of the RSN well. Subsequent <br />aquifer testing and interpretation, groundwater quality sampling, a review of past and current mine <br />inflows and a review of available public information was used to determine if the Rollins <br />Sandstone qualifies as an aquifer and if so to determine the effect mining operations may have on <br />the Rollins Sandstone or effects the Rollins Sandstone may have on the mine. Figure 1 shows the <br />site layout and boring locations. <br />Depth to water ranged from 56.5 feet below grade in the N-Decline well to artesian in the RSN <br />well. The groundwater gradient determined during the investigation is to the northeast. <br />Site hydrology was characterized by slug tests. Hydraulic conductivity (K) ranged from 0.014 feet <br />per day (ft/day) in the N-Decline well to 4.34 feet per day (ft/day) in the UTL well, transmissivity <br />(T) was calculated and ranged from at 923.78 gallons per day per foot (g/d/ft) in the N-Decline <br />well to 3084 gallons per day per foot (g/d/ft) in the UTL well. Potential pumping rate (Q) was <br />calculated and ranged from 0.62 gallons per minute (gal/min) in the N-Decline well to 195 gal/min <br />in the UTL well. <br />A review of registered water well records at the State Engine _ ;office indicated two wells within <br />a one-mile radius of the permit area. Both wells are Colorado ,:fiver alluvial wells. No wells were <br />identified in the Rollins Sandstone. <br /> <br />r2.59J\I\Stpmmber 16, 1997 <br />