Laserfiche WebLink
Section 780.11(b) Continued <br />however, recently it began retaining sufficient water to support willows within the <br />impoundment basin. Kerr proposes to partially breach the Pond B embankment <br />and allow the area to continue filling with sediment to create a riparian area. <br />Pond D and E were created by constructing embankments at the outlet of small <br />existing natural impoundments in order to increase the retention capacity for <br />disturbed area runoff. These ponds contain water year-round. <br />Pond F was created by constructing an embankment across a small natural <br />drainage to impound intermittent flows and disturbed area runoff from Pit 1 <br />(transported via PD-3). This pond typically contains water until late summer/early <br />fall. <br />Overburden and Toasoil Structures and Handling <br />No permanent overburden structures were constructed in conjunction with Kerr's <br />mining activities. The overburden stockpile located in the southeast corner of the <br />present Marr Mine area was temporary and was used to backfill the 720 Pit (See <br />Map 33, Overburden Replacement and Grading). The volume of the temporary <br />overburden stockpile was estimated at 7,100,000 cubic yards. A plan view of the <br />original pile is provided on Map 34a, Kerr Mine Area Priming Topography. This <br />volume was determined through aerial photogrammetry and related volumetrics and <br />reflects all additional to or removal of material from the stockpile, <br />Dependent on variations in material properties, conditions at the time of recovery <br />and placement, and material handling and placement methods, material swell may <br />vary significantly. Significant changes in material placement methods and material <br />breakdown as a result of multiple handling will have the greatest impact on swell <br />factors. A detailed discussion of material swell factors is presented on page 780- <br />4aa. <br />As shown on Map 31, Kerr Mine Area Soil Removal and Storage, nine temporary <br />topsoil stockpiles were constructed. These new topsoil and subsoil stockpiles <br />have been strategically located and designated to accommodate the design <br />volumes shown on Map 31a, Kerr Mine Area Soil Removal and Storage, with 3:1 <br />slope or less. Stockpiles were maintained and seeded with a rapidly growing <br />cereal grain species. <br />TR-22 780-10a Revised February 2006 <br />