2004-08-04_REVISION - M1978056 - Laserfiche WebLink

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All overburden material will be stockpiled in the pit, subject to inundation in event of permit default, therefore, as long as overburden remain in pit bottoms, there should be no additional permit liability needed under warranty. There is a point where material may need to be temporazily brought to upper perimeter areas to complete finished slopes. We therefore recommend the Division provide for up to 25,000 cu. yds. of overburden above pit locations as a precaution respective of this consideration. For purposes of warranty determination, the calculations to add to the previous warranty estimate are as follows: 25,000± cu.yds. overburden at top of slope X $0.19±per Exhibit L -assumptions for similar handling $ 4,750.00± increase to Exhibit L -Total 9. Maximum Disturbance -Exposed Highwall: VCI has indicated that the maximum number of linear feet of exposed, advancing pit highwall throughout the remainder of the operation will be 8001inear feet, at an average height of 25 feet. Unless otherwise specified by VCI, the 800 linear feet of exposed highwall will become an enforceable component of the mine and reclamation plan. If a criteria other than 800 linear feet is preferred by VCI, please specifiy the maximum number of linear feet of exposed highwall that will become an enforceable component of the mine and reclamation plan. Please respond. The length of this wall will be quadrupled to assure compliance over all locations within the permit not otherwise provided for in this Amendment. The financial warranty determination is therefore amended as follows: From Page 9 Exhibit L -Reclamation Costs: Advancing Pit Wall (Note: assumes a vertical pit wall, whereas most unfinished walls will be less than vertical and therefore the cost is greater than real world conditions): $ 1,759.26± X 4 (3200 linear feet total) $ 7,037.04± - 1 759.26f $ 5,277.78± increase to Exhibit L -Total 10. De-Watering & Dry Mining -Hydrologic Impacts: The CGRS Dewatering Evaluation Report predicts hydrologic impacts based on 73 acres of operation dewatered and excavated to bedrock. This evaluation indicates that the Carbaugh groundwater well to the south will be impacted but not completed (sic) dried up, and that groudwater wells on the north side of the Cache LaPoudre river (sic) will not be impacted as long as Yhere is water flowing in the river. Previously the Division had requested that VCI provide an assessment of the hydrologic impact to be expected at the time of maximum pit excavation due to their de-watering and dry mining activities. The Varra Companies, Inc. M1978-056 Durham Sand & Gravel Pit - 2003 Amendment- Friday 23 July 4 2004 reply to correspondence from the Colorado Division of Minerals and Geology of 9 June 2004.