Laserfiche WebLink
(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 of 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 9 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 />