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~ 1111111111111111111 <br />• <br />YVC~ <br />Yampa Valley Coal Corporation l 29588 Rout! County Road it27, Oak Creek, CO BOa67 • (303) 879-3800 <br />May Z0, 1988 <br /> <br />;'~Y 23 1938 <br />David Berry <br />Colorado Mined Land Reclamation Division <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203-2273 <br />Dear Mr, berry: <br />RE: Area 9/10 Ripping; Permit C-81-071 <br />~tt~iLnl'JG.1 I',~1fS iJ}\r;i!~iJ <br />As discussed with you during your May 13, 1988 inspection, CYCC plans <br />to use ripping as the primary soil stabilization technique in area 9/10. <br />This technique is approved in CYCC's rill and gully plan (see Technical <br />Revision 87-14 and Exhibit 28 of Permit C-81-071). However, the plan does <br />call for consulting the Division when this technique is to be used on slopes <br />in excess of 4:1. Examination of the postmining topography maps shoe; that a <br />few of the slopes at the top of Area 9/10 approach or slightly exceed 4:1. <br />As a result, this letter serves as formal consultation with the Division. <br />Examination of the postmining topography maps also shows that the slopes <br />exceeding 4:1 are 200 feet or less. Due to the short length of these slopes <br />no excessive erosion is anticipated. As required by the rill and gully <br />plan, these slopes will be surveyed. If excessive erosion develops in these <br />areas, such areas will be repaired with one or a combination of approved <br />soil stabilization measures as provided for in the rill and gully plan (i.e. <br />contour furrows). <br />Please let me know if this meets with your approval. <br />Sin rely, <br />~ / f 1~"rro-~~~ <br />1 <br />7erre1l K. J nson <br />Environments Specialist <br />TKJ/dg <br />