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.. . . <br /> <br />~~ <br />PETROLEUM <br />MINERALS <br />ENVIRONMENTAL <br />CORPORATION <br />September 8, 1994 <br />Ms. Sue MccAnnon <br />Coal Supervisor <br />Division of Minerals and Geology <br />1313 Sherman St. Room 215 <br />Denver, Colorado 80203 <br />Re: NOV C-94-21 <br />Carfion Junction Mine <br />Fle No. C-92-080 <br />Dear Sue: <br />oG(;FIVED <br />SEP 0 9'1994 <br />PROFESSIONAL <br />ENGINEERS <br />Please consider this letter as a request on behalf of Oakridge Energy, <br />Inc. to vacate the above captioned NOV G9421. In support of this request <br />to vacate the NOV, submitted herewith is information which supports the <br />position of Oakridge that "no "violation ebsted at the mine and the <br />descxiption of the alleged violation by the inspector, Wallace Eridcsori, was <br />inaccurate, incomplete and without foundation. <br />Flrstly, the subject violation was based upon sediment build-up and a <br />partially mashed culvert I have.endosed a copy of the NOV as F~diibit A, <br />attached hereto, for.your quids reference. The performance standard is that <br />the permittee provide culverts to pass the t0yr. 24hr. event. In this case <br />there are three culverts whidi are designed to carry a total peak discharge <br />of 39.75cfs. The discharge for which the culverts were designed has been <br />attached as F~ibit B, which is the "East Collection Channel" gathering <br />runoff from the east side of the disturbed area. <br />Flow through a culvert can be calculated from a nomograph, a copy <br />of which has been inducted as F~ibit C. I have shown the calculation for <br />one culvert on the nomograph in E~ibit C. Each 24" culvert will carry <br />17cfs. Thus, 2.34 of the . 24" culverts is need to carry the design <br />requirement of the regulations. Both of the culvert sets of three have the <br />capabiliiy to pass the required event even as constricted by either sediment <br />or by distortion. The same is confirmed by the color slides taken by the <br />Division, the you and t reviewed in your office on August 29, 1994. <br />• iiiiiiiiiiiiiiuiii • <br />PETROTEC INTERNATIONAL <br />INTERNATIONAL NATURAL RESOURCE CONSULTING AND DEVELOPMENT <br />P.O. Box 887 Durango, Colorado 87302 Plwne 303-3857201 Fax 303-3857201 <br />