Laserfiche WebLink
Spoil Fill 7 <br />11/28/09 <br />Page 2 <br />FILL PLACEMENT <br />CDMG regulations require that spoil be "placed in horizontal lifts in a controlled manner, concurrently <br />compacted as necessary to ensure mass stability". Maximum lift thicknesses are not specified. As indicated <br />by previous inspection reports, lifts were placed in accordance with plans specified by CTL Thompson. <br />Spoil material was transported to the fill area using a combination of trucks and dozers. Left thicknesses of <br />up to 50' were placed within the area removed from the fill face by more than 50 ft Thinner lifts of 6-8 ft. <br />with leveling and compactive effort supplied by dozers and trucks was utilized as fill placement advances to <br />within fifty feet of the slope face. No fill placement occurred during this quarter. <br />COVER MATERIAL <br />As documented by previous inspection reports, cover placement, seeding and mulching occurred during the <br />second quarter 2002. During the first quarter 2004 additional topsoil was transported to the upper-most <br />portion of the fill area lying between the area seeded in 2002 and the lateral ditch placed at the upper <br />perimeter of fill 7. The northeast portion of this area, approximately 1.60 acres, was final graded and <br />seeded in August of 2006. <br />STRUCTURAL INTEGRITY <br />The entire excess spoil fill facility was examined for signs of failure and instability such as tension cracks, <br />ground movement, springs and seeps, and standing water. No indication of potential instability was <br />observed. <br />DOCUMENTATION AND OTHER OBSERVATIONS <br />Late fall conditions prevail. Density of surface vegetation has improved as a result of good precipitation <br />during the summer of 2009 and now provides good ground cover. This will result in reduced run-off and <br />minimize sediment accumulation in Pond 7. <br />CERTIFICATION <br />Inspection was conducted by Ronald G. Thompson, a qualified professional and MSHA certified inspector <br />of earth and rock-fill embankments and impoundments, under the direction of Mr. Charles McGlothlin, a <br />registered professional engineer licensed in the State of Colorado. <br />This is to certify, to the best of my knowledge and belief, that Fill No. 7 construction and placement, as <br />noted since the previous certification and as determined during this inspection and by discussions with mine <br />personnel, is in accordance with designs as proposed by CTL Thompson in their report dated April 27 and <br />amended July 27, 2001 and as approved by the Division of Minerals and Geology. <br />s 1 <br />Ronald G. Thompson <br />Inspector <br />W44 C <br />es Mcalomi <br />Professional Engineer - ?'- . -