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The Applicant will not, as condition of the permit, affect groundwater until and unless an <br />approved Augmentation Plan has been presented to the Office. <br />17. The Division will calculate the reclamation costs for this site once all of the <br />adequacy issues have been addressed. <br />Understood. <br />6.4.15 Exhibit O - Owner(s) of Record of Affected Land and Owners of Substance <br />to be Mined <br />18. The Applicant has indicated in Exhibit C that L.G. Everest is the owner of <br />Property Number 12093200032. However, the Extraction Map shows that Robert <br />0. Nelson is the owner of this property. Please clarify this discrepancy. <br />The map revision error has been corrected and included in the map revisions in this reply. <br />6.4.19 Exhibit S - Permanent Man-made Structures <br />19. The Division is in the process of reviewing the Applicant's engineering <br />evaluation, any comments will be forthcoming. <br />Refer to the included reports from Brad Jones, P.E. (Varra Companies, Inc.), of 12 <br />August 2009; and Joby Adams, hydrogeologist (C.G.R.S.), report of 28 August 2009, <br />which address the concerns of Allen Sorensen's memorandum of 6 August 2009, Parts 3 <br />and after. Additional responses not otherwise satisfied in the CGRS reply are as follows: <br />The geotechnical stability exhibit included in the application states that the <br />`average' thickness of the sand and gravel deposit is `estimated' at 45 feet. <br />The stability analysis provided incorporates the `assumption' that the <br />maximum height of any excavated pit wall will be 50 feet. The Applicant <br />must describe the basis for the determination of a 50 foot maximum depth, <br />as excavation depth is critical to evaluation of the sufficiency of proposed <br />setbacks. <br />The estimated depth of the deposit is 49.0± feet. The use of 50.0± is <br />within reasonable proximity of the estimated maximum pit depth, which <br />may vary by natural anomalies. <br />2. The stability analysis is based on temporary excavation slopes no steeper <br />than 1:2511:1 V. The application states throughout that the excavated pit <br />slopes will be mined at no steeper than 1:25H:1 V. Mining at that slope <br />angle is not amenable to bulk mining methods typically employed in <br />gravel pits. Therefore, the Applicant must respond to the following issues: <br />Varra Companies, Inc. correspondence of 1 September 2009 to the Colorado Office of Mined Land 11 <br />Reclamation (Office) in reply to Office correspondence of 27 July 2009 - Heintzelman Project - <br />M2009-018.