2006-11-28_REVISION - M1980149 - Laserfiche WebLink

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5. The applicant states on the application form that there are 120 acres encompassing the permit azea. A review of the Division's files finds a much larger area, approximately 340.661 acres. Below is a summary of the file noting the acres added and released from the permit area since 1980. PERMITTING ACTION ACRES DATE SOURCE/COMMENTS Ori 'nal A lication 239.861 7/22/1980 As noted on a lication form AM-Ol +24.90 7/18/1988 A roved b MLRB AM-02 +170.0 2/2/1993 As noted on application form 4/27/1993 A proved by the MLRB AR-Ol -77.6 1/26/1988 A royal letter states 293 acres remainin SR-Ol -10.6 1/11/2000 10.6 acres future building location & pazking lot completely released. 7.3 acres of uplands surrounding reclaimed lake & shoreline released from backfilling & grading and topsoil replacement. 4.1 acre lake and shoreline not a roved for release AR-02 -5.9 10/31/2002 Division notes 276.5 acres remaining. This latest map conflicts with current map (attached) TOTAL 340.661 Please justify the current permit area of 120 acres versus the Division's estimate of 340.661 acres and revise the maps and permit text accordingly. 6. Please indicate the pit mining slopes and the direction of mining on one of the exhibits. 7. Please provide additional detail and designs on construction of the compacted clay liner and slurry wall. In particuiaz, please further explain the key dimensions of the clay liner, depth of the slurry wall and how the shiny wall will be constructed around the gas/oil lines and wells. 8. A review of the Reclamation Plan Maps and text provided by the operator indicates that the lake edge is 150 feet from the south bank of the St. Vrain River (approved under AM-02). The exact location of the slurry wall and compacted liner between the lake edge and the south bank of the river is unlmown. Please provide a structural analysis that verifies the minimum width or buffer of soil needed on either side of the slurry wall and compacted clay liner to provide adequate support during saturated soil conditions, as well as under a rapid drawdown scenario. 9. The applicant notes that a perimeter drain will be installed azound the lined pits. Please provide additional detail and the construction designs of the drain and locate the drain on one of the exhibits. 10. Please state if the seed mixture to be used for the site will be the same as previously approved, or if it will be revised. The approved plan calls for the planting of trees and shrubs azound the reclaimed pond slopes, which may affect the integrity of the liners. Please state if the seed mixture will be revised and if so please provide a revised seed mixture, rate of seed in and application method.