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DRAINAGE SYSTEM (UNDERDRAINS) <br />Drain sizes are specified by CDMG regulations for fills which can be classified as Valley Fills. Fill area #7 <br />is not a valley fill. CTL Thompson recommended a minimum 6' x 12' triangular 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' (azea = 80 SF). Sandstone recovered fiom durable "channel" <br />sandswne deposits encountered durint; the mining process were used in drain construction. Mirafi 160 <br />fabric was used in lieu of filter material. <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. Lifts were <br />placed in accordance with plans specified by the CTL Thompson report. <br />Spoil material was transported to the fill area using a combination of trucks and dozers. Left thicknesses of <br />upto 50 feet were placed within the area removed Gom the fill face by more than 50 feet. Thinner lifts of 6 <br />to 8 feet with leveling and compactive effort supplied by dozers were utilized as fill placement advanced <br />within the final slope face, followed by grading into final bench configuration. <br />COVER MATERIAL <br />No cover material has been placed on the excess spoil. <br />DOC~UM~E-NTATION ~~~~Q ~f <br />1~/"i0'lG S ~~ ~'V'/c~~j z'"',m'~ ~f~i~~ ~ _ Gr'i~Ct,K- ~iT~ .Cr1--, . <br />CER"I'IFICATION <br />Inspection was conducted by Ronald G. Thompson, a qualified professional and MSHA certified inspector <br />of earth and rockfill embankments and impoundments, under the direction of Mr. Charles McGlothlin. <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 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 />,:,n;,,, <br />t ryas. _.'/ea. <br />t,a:; <br />Ronald G. ppp~tto~~y}pp son Charles W. McGlothlin ~~ _•~ - <br />Inspector ~'-7 7C~~ Z Professional Engineer ~ ~~, ; i%'~ <br />i !~ L <br />', i <br />Inspections completed in compliance with Rule 4.09.1(1 1)(b) must be submitted [o the Division within two weeks.,,. <br />