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IncCONTINENTAL MATERIALS CORPORATION <br /> b. Open drainage paths and drop structures: no drop structure locations were provided on the revised <br /> Exhibit G-1. Please show proposed drop structure locations, <br /> Response: The text in Exhibit G has been revised to remove references to drop structures.There are <br /> riprap armored channels in lieu of drop structures. <br /> e. Small depressions: no small depressions were shown on the revised Exhibit G-1.Assuming these <br /> features are too small to show on the map, please provide some discussion establishing these features <br /> will provide a non-negligible amount of stormwater retention, <br /> Response: The text in Exhibit G has been revised to remove references to small depressions.The <br /> detention basin at the east edge of the permit will provide stormwater detention during reclamation. <br /> h. NEW comment: Cross-gradient channel.There is a cross gradient channel running through <br /> watersheds W53 and W55 on Exhibit G-1. Experience shows these are frequently constructed with the <br /> top of the down-gradient bank (channel right in this case) much lower than the top of the up-gradient <br /> bank (channel left),thereby skewing the channel cross-section and significantly reducing the design <br /> capacity of the channel. What is the proposed cross-section geometery for this channel and how will the <br /> design capacity be ensured during construction? <br /> Response: The cross-section geometry included in Exhibit G-2 will be used for the cross gradient <br /> channel.The channel will be constructed on a bench with a flat bottom to maintain the channel <br /> conveyance capacity. <br /> 6.4.12 EXHIBIT L—Reclamation Costs <br /> 20. Imported Material:The response requires an update. Based on the DRMS December 5, 2019 site <br /> inspection and a subsequent meeting with Pikeview personnel in Denver on December 13, 2019,The <br /> DRMS understands additional area just north of the maintenance shop and within the permit boundary <br /> is to be affected area as a borrow source.This is not reflected in the December 11, 2019 response. <br /> Please clarify if this borrow area is expected to have sufficient material to eliminate the need to import <br /> any of the required 2,345,000 yd3 of imported fill material. If not, please provide an estimate of how <br /> much will need to be imported.The DRMS is required to hold sufficient bond to import (purchase and <br /> haul costs)fill material that is not available within the permit area. <br /> Response: See responses to comments 6 and 12. Exhibit L has been revised to include the reclamation <br /> costs associated with excavating and hauling all the material required to reclaim the quarry, <br /> revegetating the increased disturbance area, and generating growth media using onsite soil mixed with <br /> mulch. <br /> Pikeview Quarry Amendment 4, Response to Adequacy <br /> January 7, 2020 <br />