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-39- of the Division, a discrete and conservative distance should be stipulated to protect the public occupants of Colorado Highway 151 right-of-way. Therefore, the operator has committed to stop traffic on Colorado State Highway 151, when explosives are to be detonated within 500 feet of that highway. Traffic will be halted five (5) minutes prior to detonation. The company will allow traffic movement to resume only when it had determined that travel in or through the area may be safely pursued. The proposed operation is in compliance with this section. XVII. Backfilling and Grading - Rules 2.05.3(3), 2.05.3(4), 2.05.4(2)(a), 2.05.4(2)(c), 4.09, 4.13, and 4.14 The Chimney Rock Coal Mine is a truck and shovel operation. Overburden and interburden are blasted and loaded by shovels into trucks. Overburden and interburden are hauled by truck to areas designated for spoil deposition. Coal is then ripped with a tractor and loaded into trucks for haulage to a crusher. This cycle is repeated for each of the two seams being extracted within the Deep Creek area. Overburden and interburden from the initial cut will be transported to the southern spoil area (1CR2) for permanent deposition. Overburden and interburden handling techniques are in conformance with standard industry practices. It is important, in order to determine the appropriate post-mining topography for any surface mine, to analyze the swell factors for overburden and interburden process during mining at the site. Increase in volume of overburden and interburden can be offset by removal of coal during the mining process. The relative volumetric effects of these two components must be definitively understood in order to correctly project the volume of backfill and the appropriate resulting post-mining topography. of the mined area. In November, 1984, Chimney Rock Coal Company submitted a report demonstrating that the backfilling practices being utilized in other areas of the mining operations are resulting in swell factors slightly less then had been originally projected. As a result, the operation realized a minor (3.5% equals 150,901 cubic yards) backfilling deficit for the Barren Ridge and Revision No. 1 areas. The Division considered the amended post-mining topography to appropriately accommodate the anticipated backfilled spoil volumes. In order to verify the accuracy of Chimney Rock's swell factor and bulking factor projections, the Division deemed it appropriate to impose the following stipulation: Stipulation No. 2 THE DIVISION DIRECTS CHIMNEY ROCK COAL TO VERIFY THE ACCURACY OF ITS OVERBURDEN/INTERBURDEN SWELL FACTOR AND BULKING PROJECTIONS FOR THE PERMIT REVISION N0. 2 AREA. IN ORDER TO ACCOMPLISH THIS VERIFICATION, CHIMNEY ROCK COAL, SHALL COMPLETE AN ANNUAL SURVEY OF THE DISTURBED AREA. THE COMPANY