Laserfiche WebLink
The inlet to Pond 1 is shown in cross-section B-B' on Drawing D-2-4. <br />The culvert discharging into the pond conveys the sediment and runoff <br />from the drainage swales into the pond. Runoff from undisturbed areas <br />is diverted away from the pond by a 2-foot high berm around the pond <br />and along the outside of the drainage swales. <br />Pond 1 has no emergency spillway; however, provisions are planned to <br />pump out the pond if the storage volume reaches twice the 100-year, <br />24-hour storm runoff volume. Pumping would be done with a portable <br />pump submerged in the pond with discharge directed to the concrete- <br />lined ditch north of the loadout building. The total capacity of Pond <br />1 is approximately 4.6 acre-feet. The capacity of the pond dedicated <br />to storm runoff is approximately twice the 100-year, 24-hour storm <br />volume. <br />Conveyor <br />• Sediment eroded from the disturbed area along the conveyor corridor is <br />calculated to be 0.1 acre-feet. Except for the area above the <br />Kaiser-Siever Ditch, the sediment will be collected in the two sumps <br />shown on Drawing D-2-4. The area above the irrigation ditch is <br />included in small area exemptions. <br />Sediment control for the conveyor area also requires control of the <br />sediment in the washdown water used to flush the coal fines from the <br />truck dump facilities and the conveyor. The truck dump facility con- <br />tains a sloped floor with a catch basin where periodically the sedi- <br />ment from the truck dump will be flushed. Sediment from the catch <br />basin will be discharged by gravity through an B-inch diameter PVC <br />pipe which will be contained within the conveyor tube. The conveyor <br />will be completely enclosed within a tube which is designed to collect <br />Coal dust which drops from the conveyor while coal is being trans- <br />ported from the truck dump to the loadout building. Periodically <br />• <br />4-135 <br />