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• Overburden Analysis; <br />One sample each of overburden and interburden taken trom the highwall at <br />Pit 3 have been analyzed per Mined Land Reclamation requirements. These ana- <br />lyses are herein enclosed. The overburden sample is referred to as sample 16 <br />by CSU laboratory. The interburden sample combined interburden between Riders <br />1, 2, 3, 4 & 5 and are referred to as sample 17 in the attached analysis. <br />Overburden, interburden and underburden channel samples at Pit 4 were <br />collec~eo on October 20, 1983. These samples were analyzed on November 21, <br />1983. Six samples were taken: an overburden, interburden and underburden at <br />the north and south ends of the active highwall. Chemical analyses are <br />reported on pages II.D-7a-II.D-Ic. Pit 4 is referred to in the chemical ana- <br />lyses as "Bruggan Pit". Physical observations are as tollows: <br />Overburden: 15' to 20' of mostly poorly indurated medium to tine grained <br />buff sandstone with dark gray clay-shale stringers. <br />• Sandstones are in 1' to 2' massive featureless beds. <br />Overburden rests on a coal seam 35" to 40" thick. <br />Interburden: About 12' to 15' of interbedded fine grained sandstones and <br />caly-shale. Sandstone accounts for about /0% of the rock. <br />Clay-shale accounts for the other 3U%. Interburden rests on <br />another coal seam 35" to 40" thick. <br />Underburden: 18" exposures of a hard, dark gray, limey clay-shale. <br />• <br />II.D-6 <br />12/87 <br />