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Jason Musick -2- June 8, 2015 <br />above the gob pile has a grade of over 45%, which is very steep. This steep of <br />a channel would have very little colluvial fill. <br />Another potential source of groundwater would be from a seep. A seep in this <br />location is unlikely due to the dip of the strata being to the north, so no springs <br />have been identified, nor are any springs likely to occur. <br />Currently there is a 1600 foot underdrain installed under the majority of gob pile <br />#2 with an average grade of 15%. It runs along the length of the pre - <br />disturbance channel alignment. Quarterly inspections over the last several years <br />have not noted any discharge from this underdrain, and a site inspection June 4, <br />2015 confirmed that there is no discharge. <br />In addition, fifteen geotechnical holes have been drilled in the footprint of gob <br />pile #2, with depths ranging from 25 to 46 feet, and none of those holes <br />encountered groundwater. <br />Based on the <br />❑ lack of discharge from the existing underdrain, <br />❑ no seeps in the area, <br />❑ no groundwater encountered in 15 geotechnical holes drilled <br />❑ steep grade of channel north of gob pile #2, <br />it would be a reasonable assumption that there is no groundwater in the area <br />of gob pile #2. Please consider a variance from requiring installation of an <br />underdrain extension. <br />Please feel free to contact me if you have any questions. <br />Sincerely, <br />itYA"'n'Q- . <br />Tamme Bishop, P.E. <br />Project Engineer <br />Cc: Bill Bear, Bowie Resources, LLC (electronically) <br />Paonia Public Library <br />Bureau of Land Management (electronically) <br />US Forest Service (electronically) <br />