PERMFILE69798 - Laserfiche WebLink

Home Browse Search

Topsoil Redistribution Rule 7: Permits Proper site preparation will precede reapplication of topsoil and subsoil in all reclaimed areas. Areas disturbed by mining wit l be subjected to final grading, but will remain in rough condition to assist stability and resist slippage oftopsoil after reapplication. Leaving the graded surface in a roughened condition will also improve moisture permeabilitybetweenthesoiVspoilinterface. Compacted areas such as roads will be ripped to a depth of 18 inches. The timing oftopsoil and subsoil reapplication will be dependent on completion ofbackfilling and grading. It will be advantageous for reapplication to take placejust prior to the fall or spring seeding windows. Topsoil and subsoil will be removed from stockpiles using dozers and trucks. Subsoil will be spread evenly over spoil using dozers working along the contour wherever possible. This will be followed by reapplication oftopsoil over subsoil using the same technique and equipment. Areas with steep slopes such as the contour mining areas in Lorencito Canyon may preclude redistribution along the contour. Topsoil will then be graded to ensure a uniform and stable thickness consistent with reclamation and revegetation requirements. Prior to seeding, topsoil will bechisel-plowed in orderto alleviate compaction and promote water infiltration. Prior to reapplication ofstockpiled topsoil and subsoil, representative samples will be subjected to physical • and chemical analyses as required by sections 4.06.2 (4) and 4.06.5 ofthe regulations. Nutrients or other soil amendments will be applied to soil and overburden materials to be used in reclamation if testing indicates deficiencies. Samplingofreplacedsoilswilltakeplacewithinoneyearofreclamation. Samples from depthsof0-12 inches and 12-24 inches will be collected on 500 foot centers throughout reclaimed areas. Analyses of the physical and chemical parameters listed in Section 4.06.2 (4) ofthe regulations will be conducted. A two- footthick veneer of low SAR (sodium adsorption ratio) growth medium wit l be spread over any areas where the SAR exceed 15. in general, all topsoil and usable subsoil stripped and stockpiled for each facilitywill be redistributed evenly across that facility. In the unlikely event that a significant surplus of soil has been stockpiled in a specific location, it will be utilized in the reclamation at a site deemed to have a topsoil deficit. For the JeffCanyon Surface Mine, it is estimated that approximately 0.85 feet oftopsoil and subsoil (an average of 0.7 feet strippedplusa20%swellfactor)willbeevenlyrespreadoverthereclaimedazea. Additionalusablesoil may be recovered from areas where mapping shows that less soil or no soil is available. Recovery ofthis additional soil during stripping will increase the thickness ofthe respread material. The wntour mining area in Lorencito Canyon has significantly more topsoil than the JeffCanyon Surface Mine, which should also provide some surplus for other areas. ~ ~~ti 1 ~,m~„o~,,.PMTI,,,v~,,,~, ~,, 2.05-59 (revised 07/25/01)