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2002 Soil Sampling: Seneca Mine, Hayden Colorado <br />Yoast Mine <br />Year 2002 Topsoil Redistribution Depth Sampling <br />Intermountain Resource Inventories Inc. was contracted by Seneca Coal Mine <br />located in Hayden, CO to check topsoil redistribution depths at the Yoast Mine. <br />Jeffery P. Hahn, CPSS and James L. Whiting were the principal investigators. <br />Topsoil redistribution depth was sampled by choosing 2 intersecting transects in the <br />south portion of the east Yoast Mine area which had been re-graded earlier in 2002. <br />Twenty- three sample points were chosen along a roughly N-S transect and eleven <br />more points were chosen along a roughly E-W transect. Sample points were <br />approximately 100 feet apart on each transect. The mine permit called for a topsoil <br />redistribution depth of 0.9 feet within disturbed areas. The mean topsoil redistribution <br />depth based on 34 samples was 1.15 feet with a median of 1.1 feet and a range of <br />0.5 to 2.5 feet. Mean topsoil redistribution exceeded the standard by 0.25 feet. <br />Therefore within the area of interest (new topsoil redistribution in 2002) topsoil <br />redistribution was adequate. <br />Methods <br />A baseline map with the permit boundary, disturbance boundary, roads and <br />. topographic contour lines was produced at 1 inch = 400 feet scale (Appendix IV, <br />Map 2). Two transect lines within the area of concern locating topsoil redistribution <br />depth sample points were located on the map. In the field sample points were <br />located from the map. Soil augers were used to verify topsoil redistribution depths. <br />Sample points and depth were recorded in tenths of feet. <br />Results <br />Thirty-four sample points were located within the area of interest (new topsoil <br />redistribution in 2002) (Appendix IV, Map 2). Appendix III (Yoast Mine) has topsoil <br />redistribution sample sites and corresponding depths. The mean topsoil <br />redistribution depth was 1.2 feet. The median depth was 1.1 feet. Standard deviation <br />was 0.7 with an RZ of 0.4. Range of depth is 0.5 to 2.5 feet. <br />Conclusions <br />Mean topsoil redistribution exceeded the standard by 0.3 feet within the area of <br />interest (new topsoil redistribution in 2002). Topsoil redistribution was adequate. <br />• <br />Page 5 of 5 01/28/03 <br />