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COLORADO WESTMORELAND INC. <br />P.O. Box 1299 Paonia, Colorado 81428 ^ 303-527-4135 <br />December 8, 1986 <br />Dr. James Pendleton <br />Colorado Mined Land Reclamation Division <br />423 Centennial Building <br />1313 Sherman Street <br />Denver, Colorado 80203 <br />RE: GE07ECHNICAL CONCERNS <br />Dear Jim: <br />~~~ <br />~ ~~e <br />F~~ ~T~~4 J986 <br />c F <br />/ 0 O <br />~ti0'1'O <br />~y~si <br />0,~, <br />As we discussed, Colorado Westmoreland in its Orchard Valley West's con- <br />struction has additional geotechnical concerns, These concerns have been <br />discussed previously with Golder Associates and they have concluded that no <br />problems will result in fill stabi]ity, <br />CWI is currently completing colluvium and rock excavation, Some rock was <br />expected and needs to be used in the fill area, Without the use of this <br />rock, a shortage of fill material and additional handling problems may <br />result, <br />The rock will he used in three locations: <br />1. Rock will be placed in the core of the fill at non-critical stabi- <br />lity areas. Although some settlement could occur, no problems are <br />anticipated in operating the mine site, The proposed location is <br />as stated in the Golder letter attached, <br />2, A small rock buttress will be placed at the location of the first <br />terrace, This will help stabilize the layer of topsoil and outer <br />edye of the fill which cannot always compacted as much as within <br />the core area, <br />3. Additional rocks will be placed at the intersection of the fill <br />area to the existing ground, In our discussions with the Division, <br />we have referred to these as "groin" areas. These rocks will be <br />placed there as a means of erosion control, <br />Golder Associates will visit the site as we place rocks in these areas, If <br />you have further questions or comments, please contact me. <br />Sincerely, <br /> <br />Matthew S. Sakurada <br />Manager of Engineering <br />O <br />suesoinA. of M$$/SV <br />NESiM OAELON~ <br />COOL COMPeN~ <br />attachment <br />