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• <br />DIVISION OF MINERALS AND GEOLOGY <br />Department of Natural Resources <br />1313 Sherman Sr., Room ? 15 <br />Denver, CO 80203 <br />Phone: (303) 866 3567 <br />FAX: 1303) B32 8106 <br />DATE: June 10, 1993 <br />TO: Michael B. Long <br />FROM: Larry Routten <br />pF' COQ <br />~~ 4b <br />.;p <br />~• <br />~B l6 ~ <br />Ruy Romer <br />Governor <br />Michael B. Long <br />Division Director <br />RE: Vacation Request for NOV C-93-019; Colowyo Coal Mine (C- <br />81-019) <br />The Division received a request for vacation of the above <br />referenced NOV from Colowyo Coal Company on June 4, 1993. The NOV <br />was issued for failure to pass disturbed area runoff through a <br />sediment pond, failure to protect offsite areas, failure to <br />minimize offsite sediment contributions and, failure to maintain <br />ditches. The NOV was issued following an inspection in which <br />extensive offsite damage was observed to have occurred as a result <br />of the South Collection Ditch failing and overflowing in a number <br />of locations after a large thunderstorm at the mine. Several <br />hundred cubic yards of earth were carried onto and across State <br />Highway 13 and into a pasture on the opposite side of the highway <br />from the mine. An undetermined amount of surface runoff flowed <br />into Goodsprings Creek. <br />Colowyo's request for vacation is based on four points: <br />1. Colowyo contends that the storm which instigated the <br />problems was greater than a 10-year, 24-hour event which the <br />ditch was designed to handle. As evidence, they submit <br />rainfall amounts and times from some form of rain collection <br />devices on two nearby ranches. <br />While the storm was apparently a large one, I do not feel that <br />sufficient evidence has been submitted to document that the <br />storm resulted in flows greater than those which would follow <br />a 10-year, 24-hour event. The Division has no substantiation <br />of the accuracy of the collection devices cited and there is <br />no record as to how the time duration of the storm was <br />documented. <br />• iii iiiiiiiiiiiuiii <br />STATE OF COLORADO <br />