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U <br />~~ <br />October 18, 2006 <br />Colorado Historical Society <br />Office of Archaeology and Historic Preservation <br />1300 Broadway <br />Denver, Colorado 80203 <br />RE: Northfield Coal Mine <br />Dear Mr. Wolff, <br />~~V~~ it ~~ <br />OCT '~ 0 `L006 <br />pivision °t and Safety n, <br />Mining <br />Thank you for your phone call today regarding the proposed Northfield Coal Mine. <br />Included with this correspondence are the maps we discussed depicting the proposed <br />permit azea and delineated surface facility. <br />Northfield Partners LLC proposes underground mining of the Ocean Wave coal seam <br />ranging in depth from approximately 300 feet on the east side of the project to 800 feet <br />deep on'the west'side of the project. The proposed surface facility will enclose a total <br />area of approximately 25 acres with less than 25% developed as structures. Surface <br />impact for the remainder of the permit azea is possible as subsidence impact <br />Subsidence impacts were calculated based on British National Coal Board prediction too] <br />which considers depth of overburden, width of mined wall and height of target coal seam. <br />Average maximum subsidence was calculated at approximately 4 feet. Based on historic <br />subsidence documentation at existing coal mines in the area, operating shallower mines, <br />maximum subsidence.was 55% of calculated potential, which leads to a realistic potential <br />for worse case subsidence at 2 feet. <br />If you have any further questions, please contact me directly at 719-275-8951. <br />Respectfully provided, <br />~ ~ <br />Angela,Bellantorii , , ,:~: , <br />Cci'Kenf Gorham, DRMS <br />. ~, , . of 1 ~ ~ . <br />'L,' ~ a,. <br />. . .. . ... -~ .-] .v L. <br />~~~~riir~nn~n~~~i~ /~,\II~~~rrn~Lii~~/~S Il~c„ <br />410 Macon Ave. Canon City, CO 81212 <br />www.envalternatives.com • e-mail: eaiQbresnan.net <br />Phone: 719-275-8951 • Cell: 719-429-8950 <br />C/~-,\II <br />