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i =-=' TerraMatrix <br />Engineering ~ Environmental Services <br />III IIIIIIIIIIIIIIII <br />sss <br />1475 Pine Grove Road • PO Box 774018 <br />Steamboat Springs, Colorado 80477 <br />303-879-6260 • fax 303-879-9048 <br />April 15, 1994 <br />Mr. Randall P. Price <br />Colorado Division of Minerals and Geology <br />1313 Sherman Street -Room 215 <br />Denver, Colorado 80202 <br />RFr,Fn~~~ <br />A ~~ 1 ~ i994 <br />Dit'Ia.Jil VI IYIiliC piJ u 4e~,..y, <br />Re: Kerr Coal Company, Marr Mine (Permit No. C-80-006) -Supporting Documentation for <br />3/15/94 Request for Partial Bond Release <br />Dear Randy: <br />Accompanying this transmittal are three copies of the following supplemental documentation, <br />submitted in support of Kerr Coal Company's (Kerr) 3/15/94 partial bond release reques[: <br />Maps <br />• Map 37A -Kerr Mine Area -Postmining Topography <br />• Map 38 - Premising and Postmining Cross-Sections (Kerr Mine Area) <br />• Map 47 -Kerr Mine Area -Actual Reclaimed Topography <br />Appendices <br />• Appendix A -Comparative Reclamation Photos <br />Other Documentation <br />Affidavit of Publication <br />720 Pit/Overburden Stockpile Cut/Fill Isopach and Volumetric Summary Sheet <br />Pit 1 Cut/Fill Isopach and Volumetric Summary Sheet <br />You will note that the 720 Pit/Overburden Stockpile Cut/Fill Isopach indicates two areas at the <br />south end of the former overburden stockpile where some fill material may remain. The <br />apparent existence of remaining fill material may be due to any one or a combination of several <br />factors. <br />The cut/fill Isopach was developed by subtracting a "premising" topographic base from the <br />topographic surface resulting from the most recent (1/28/94) aerial mapping. Unfortunately, <br />given the long history of mining in this area, Kerr did not have accurate premising topographic <br />mapping for the 720 Pit and Overburden Stockpile area. The "premising" topographic base <br />was, therefore, developed from existing available USGS topographic mapping by digitizing the <br />mapped topography for these areas and filling in the intermediate contours. Given this <br />approach and the fact that the USGS topography was mapped on a twenty-five foot contour <br />interval, some of the topographic variation indicated by the cut/fill Isopach (up to one-half of <br />the contour interval or 12.5 feet) may be due to limitations in the accuracy of the "premising" <br />topographic base. <br />Steamboat Springs, CO • Denver, CO. Seattle, WA .Juneau, AK. Santiago, Chile SA <br />