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<br />0 Fill ("af", "pf". and "if") <br />We have mapped three different types of fill on the site. The first, "af", is <br />general fill used to construct the stormwater dams, roads, and other bench areas. <br />The second is "pf", or pit fill, which occurs within the southern portion of the <br />"Hole". The resulting, relatively flat-lying fill that covers fills this portion of the <br />"Hole" is variable in thickness. The third is "rf", or reclamation fill, which generally <br />consists of a triangular wedge of fill on the highwall benches covered with topsoil, <br />and grading fill covered with topsoil in the reclamation areas to the north and south <br />of the active portion of the pit. Mining activities have modified large portions of the <br />site with cutting and filling. Not all areas of fill, such as the entry road and <br />Allegheny Drive, are mapped. <br />Colluvium (Qc) <br />• The colluvium unit consists of clayey or silty sand derived primarily from in- <br />place weathering of bedrock deposited by gravity and sheet wash. The deposit is <br />generally only a few feet thick and occurs on the slopes in the eastern part of the <br />site. <br />Landslide (Qls) <br />This unit is an older landslide (hundreds to thousands of years), a portion of <br />which occurs in the far north end of the permit boundary. The material involved in <br />the slide likely consists of weathered Pierre Shale and overlying deposits that slide <br />down valley to the northeast. <br />Piney Creek Alluvium (Qp) <br />The Piney Creek Alluvium has also been mapped as the Husted Alluvium, <br />and terrace alluviums 1 and 2 on various geology maps. The material in this unit <br />consists of organic-rich clayey silt and sand. <br />• <br />TRANSIT MIX AGGREGATES 7 <br />PIKEVIEW QUARRY SLOPE <br />CTLIT PROJECT NO. CS17341-125 <br />S:1CS17000-174991CS17341.0001125%2. Reports1CS17341-125-R1-Final.doc