Laserfiche WebLink
VII. Disposal of Excess Spoil <br />Mining in the Wolf Creek Area resulted in the generation of excess spoil material. In <br />1986, the Division approved placement of excess spoil in an ephemeral drainage adjacent <br />to the initial box cut. The following findings were made for the Wolf Creek spoil <br />material fill: <br />1. The Division has approved the use ~f a disposal azea for excess spoil. (4.09.1(1)). <br />2. The Division has reviewed and approved the designs for the fill. (4.09.1(2)). <br />3. The Division has approved the use of vegetation and organic material as mulch or as <br />an amendment to topsoil to control erosion, promote growth, or increase moisture <br />retention. (4.09.1(4)). <br />4. The Division has approved of the location ofthe disposalazea. (4.09.1(6)). <br />5. The applicant has proposed an alternative method for disposal of excess durable rock <br />by gravity placement in single lifts. The altemative method is certified by a <br />qualified registered professional engineer as resulting in a fill which will be stable <br />and will meet all other applicable requirements, including Rules 4.09.1 and 4.09.3. <br />The excess rock spoil consists of at least 80% by volume, durable non-acid and <br />non-toxic forming rock that does not slake in water and will not degrade to soil <br />material. The fill is designed to attain a minimum long-term safety factor of 1.5 and <br />an earthquake safety factor of 1.1. Surface water runoff from areas adjacent to and <br />above the fill shall be diverted away into stabilized channels designed to meet the <br />requirements of 4.05.3 and safely ~ ass a 100-year, 24-hour precipitation event. <br />Therefore, the Division has approved use of the altemative method for rock disposal. <br />(4.09.4). <br />Construction of the underdrain and placement of fill was completed in August 1987. At <br />that time, inspection reports regarding construction of the underdrain were conducted by <br />Seneca Coal Company. Submittal of those reports was incompliance with Stipulation <br />No. 4 of the 1987 permit. Therefore, that stipulation is no longer required on the permit. <br />Final reclamation of the fill will commence at the end of mining, when the adjacent Road <br />A2 is no longer in use. Quarterly inspections of the fill will be conducted by Seneca Coal <br />Company during reclamation activities and for at least one yeaz following revegetation. <br />Additional information on the excess spoil fill is located in Tab 12 of the permit <br />application. <br />37 <br />