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S.b(3) Continued <br />The estimated cost for this seed mixture is 52.00/lb, <br />which yields a per-acre seed cost of $39.00/acre. <br />Estimated re-vegetation areas for the worst case (in <br />which all access approaches and drill sites are rutted) <br />are given in Table 1. Ground smoothing and seed <br />application services are estimated at $50.00/hr. At 2.0 <br />hours of ground smoothing and seed application for each <br />of the 13 sites, it is estimated that the worst case <br />total re-vegetation cost would be a total of 51,313. <br />(4) Depth of drill holes: <br />The expected depth of drilling is 20 to 50 feet for each <br />hole. <br />(5) Whether aquifers will be encountered (include supporting references); <br />Drilling will start from the ground surface and continue <br />until bedrock is encountered. Only alluvial groundwater <br />will be encountered during drilling <br />(6) Precise description of how drill holes will be sealed and plugged in <br />accordance with Rule 4:07; and <br />All boreholes will be converted to alluvial monitoring <br />wells. Details on well completions are given in Section <br />9.3 Adrian Brown Consultants' Work Plan for Alluvial <br />Groundwater characterization, Big Elk Mine (copy <br />attached). The alluvial monitoring wells will be left <br />in place for the life of the Big Elk Mine, <br />When the monitoring wells have reached the end of their <br />service life, the entire well bore will be sealed with <br />bentonite pellets up to 7 ft from the well collar; a <br />cement plug will be installed from the well collar down <br />to the bentonite seal. The well casing will be cut 2 to <br />3 feet below the ground surface. The estimated cost for <br />sealing and plugging all 19 alluvial monitor wells is <br />given in Table 2; this cost estimate is for the worst <br />case in which each well is completed as a 2 in. diameter <br />well to a total depth of 50 ft. <br />(7) Whether holes will be developed as water wells and, if so, the well permit <br />issued by the Colorado Division of Water Resources. <br />The holes will not be developed as water wells. <br />5 <br />