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Jared Ebert <br /> November 8, 2019 <br /> Page 3 of 6 <br /> high and low water levels are shown on the drain profiles. This design concept has been utilized <br /> at the Challenger Pit just north of the West Mine Area. <br /> One dimensional steady state ground water flow equations commonly used in construction <br /> dewatering were used to size the drainpipe. The calculations are presented in Appendix G-1. <br /> The analysis indicated a drain pipe diameter of six inches would be adequate. <br /> f. DRMS Response(3): Please commit to installing the drain concurrently with the installation <br /> of the slurry wall. Also please commit to submitting a technical revision to update the final <br /> design of the drain along with any modifications of the location of the slurry wall. <br /> Al Response:Aggregate Industries-WCR, Inc. will install the drain concurrently with the <br /> installation of slurry wall and submit a technical revision to update the final design of the <br /> drain along with any modifications of the location of the slurry wall. <br /> Rule 6.4.14, Exhibit N -Source of Legal Right to Enter <br /> 32. Exhibit N contains a Special Warranty Deed documenting the City of Thornton owns Tract J, <br /> however it does not document the Applicant's source of legal right to enter and conduct <br /> operations within this tract. Please provide documentation of the applicant's legal right to enter <br /> Tract J in accordance with <br /> a. Al Response: Aggregate Industries is working with the City of Thornton to obtain the required <br /> documentation. We will forward the information upon receipt. <br /> b. DRMS Response: This item remains outstanding and will need to be addressed prior to the <br /> approval of AM01. <br /> c. Al Response: So noted. The Legal Right to Enter from the City of Thornton has been <br /> approved as to form. We will forward the executed document upon receipt. <br /> d. DRMS Response (3): This item remains outstanding and will need to be addressed prior to <br /> the approval of AM01. <br /> Al Response: An executed copy of the City of Thornton Legal Right to Enter is attached. <br /> Rule 6.4.19, Exhibit S—Permanent Man-made Structures <br /> DRMS Response (3): DRMS reviewed the Slope Stability Analysis adequacy response by <br /> Tetra Tech dated September 16, 2019 for the Tucson South Resource 112c permit amendment <br /> application (AM-01). The Division accepts the proposed mining plan setbacks at the Tucson <br /> South Resource site with the exception of one discrepancy noted in the adequacy item below. If <br /> groundwater is intercepted shallower than expected and/or the soils differ from the expected <br /> profile, the Applicant must contact the DRMS immediately and reevaluate the stability analysis <br /> based on the updated information. Please note any transgression of the proposed setbacks and <br /> sloping will be considered a permit violation if the permit is approved and issued. <br /> Aggregate Industries—WCR,Inc <br /> 1687 Cole Blvd Suite 300 <br /> Golden,CO 80401 <br />