Laserfiche WebLink
s~-a" R. <br />DISPOSAL OF EXCESS SPILL <br />Fill Area #8 Construction <br />January 25, 2002 <br />~~~.L~-f~ b ~{ <br />RECE'~E`~ <br />APR 2 2 2002 <br />DIVI$laa of Minerals and &eolagy <br />The CTL Thompson report dated April 27, 2001, "Stability Analysis and Geotechnical Recommendations <br />Lorencito Surface Mine Phase I" addresses the general requirements as also cited in Sections 4.09.1 to <br />4.09.2 of the Colorado Mined Land Reclamation Boazd for Coal Mining. <br />ACTIVITIES NOTED DURING INSPECTION <br />The spill disposal azea was under active construction. Most vegetation had been removed and tosoil was <br />actively being recovered. The underdrain channel had been cut and rock placement completed within [he <br />excavated channel. Filter fabric was being installed over the rock under drains. <br />SEDIMENT CONTROL <br />Sediment pond construction has been completed in accordance with plans submitted to and approved by <br />the DMG and as-constructed survey/drawings certified by Registered Land Surveyor and Registered <br />Professional Engineer. All surface run-off from the fill areas is directed to this sediment control facility. <br />SITE PREPARATION <br />Organic materials such as brush and trees have been removed from [he proposed fill areas. Topsoil has <br />been recovered from (with the exception of exempted steep slopes) and stockpiled for use in reclamation of <br />the fill area. Design criteria did not require keyway cuts for steeper valleys with minimal soil cover (fill <br />#8). <br />No evidence of springs or seeps was observed during site preparation. <br />DRAINAGE SYSTEM (UNDERDRAINS) <br />Drain sizes are specified by CDMG regulations for fills which can be classified as Valley Fills. Fill area =8 <br />is not a valley fill. CTL Thompson recommended a minimum 6' x 12' [riangulaz section(area = 64 SF) for <br />this size fill As constructed drainages generally were more trapezoidal with a top width of 12', bottom <br />width of 8', and average height of 8' (area = 80 SF). Sandstone recovered from durable "channel" <br />sandstone deposits encountered during the mining process were used in drain construction. Mirafi 160 <br />fabric was used in lieu of filter material. <br />FILL PLACEMENT <br />Significant quantities of fill material have not been permanently placed. <br />COVER MATERIAL <br />Final fill configuration has not been obtained and no cover material placed on the excess spoil. <br />