Laserfiche WebLink
purpose, primed with cast primers and detonated with detonating cord. A certified <br />blaster was in charge of all blasting operations to ensure compliance with State and <br />Federal laws. Additional information regarding planned blasting operation is located in <br />Volume 10, Tab 12 of the PAP. <br />VII. <br />Disposal of Excess Spoil <br />Mining in the Wolf Creek Area of the original permit area resulted in the generation of <br />excess spoil material. In 1986, the Division approved placement of excess spoil in an <br />ephemeral drainage adjacent to the initial box cut. The following findings were made <br />for the Wolf Creek spoil material fill: <br />1. The Division has approved the use of a disposal area for excess spoil. <br />(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 <br />as an amendment to topsoil to control erosion, promote growth, or increase <br />moisture retention. (4.09.1(4)). <br />4. The Division has approved of the location of the disposal area. (4.09.1(6)). <br />5. The applicant has proposed an alternative method for disposal of excess durable <br />rock by gravity placement in single lifts. The alternative 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 <br />4.09.3. The excess rock spoil consists of at least 80% by volume, durable <br />non-acid and non-toxic forming rock that does not slake in water and will not <br />degrade to soil material. The fill is designed to attain a minimum long-term safety <br />factor of 1.5 and an earthquake safety factor of 1.1. Surface water runoff from <br />areas adjacent to and above the fill shall be diverted away into stabilized channels <br />designed to meet the requirements of 4.05.3 and safely pass a 100-year, 24-hour <br />precipitation event. Therefore, the Division has approved use of the alternative <br />method for rock disposal. (4.09.4). <br />Construction of the underdrain and placement of fill was completed in August <br />1987. At that time, inspection reports regarding construction of the underdrain <br />were conducted by Seneca Coal Company. Submittal of those reports was in <br />compliance with Stipulation No. 4 of the 1987 permit. Therefore, that stipulation <br />is no longer required on the permit. Final reclamation of the fill has been <br />completed. Quarterly inspections of the fill were conducted by Seneca Coal <br />Company during reclamation activities and for at least one year following <br />revegetation. <br />23