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~I~ II~I~~~~~II~~ ~~~ <br />saa~,;aszy 12.rniEN i~ 'i6a I"J <br />~oal;~~u~ia3~ arre r a3n rv~ <br />1861 ~: I n o ^~ <br />!i~.i~,~ r':~., ~~ rte; a,~ <br />AN DE,~.rtTE <br />ROCK COM PANY <br />OUARRV: OFFICE: <br />P,O. Box 625 313 South Phillips <br />Lyons, Colorado 60540 Sioux Falls, S. D. 57102 <br />303-043-3490 605-334-5000 <br />November 16, 1981 <br />Mr. James McArdle <br />Mined Land Reclamation <br />423 Centennial Building <br />1313 Sherman Street <br />Denver, Colorado 80203 <br />RE: Andesite Rock Company - File #77-141 <br />Dear Mr. McArdle: <br />In response to your request for information on the above referenced <br />permit. I am submitting the following: <br />1. The joint structures of the andesite are predominantly <br />verticle. The horizonal distance between these joints <br />averages about 2'~ to 3'. (see photo) <br />2. The final quarry face will not be benched. As shown on <br />drawing 677-3, the final slope of the rock face will lay <br />at approimately '~ horizonal to 1 vertical. <br />3. It is our feeling that this slope will be sufficient to <br />preclude an unstable face. The Colorado Division of <br />Highways cuts thru rock embankments are 1. The over- <br />burden section that lays above the rock face will be <br />sloped at 3 horizonal to 1 vertical. <br />~,. <br />L <br />