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South Hinsdale Response to Objections <br /> 12 July 2022 <br /> 1.4 Phasing and Geometry. <br /> As discussed in Note 1 (Exhibit C between item 4 and 5), approximately 3 to 3.5 acres will <br /> be involved in each phase(year), including 1.5-2.0 acres being mined plus a 1.5-acre work <br /> area. This is based on estimated demand and production. <br /> As shown on Figure CA (Page 15) and discussed in item 3.o, "Highwalls" (working faces) <br /> will be sloped during actual mining between 21-1:1 V to 3H:1 V. Potentially, a few areas may <br /> need to be 21-1:1 V to match road grades and provide adequate drainage and protection of <br /> off-site areas from uncontrolled drainage, but as much as possible slopes will be 31-1:1 V <br /> or flatter. At any one time this working face is expected to be a maximum of 10-15 feet <br /> high and up to 250 feet in length in areas actively mined (not in some phase of <br /> reclamation). <br /> USFS has requested that we provide alternatives for access which will change the <br /> configuration and direction of mining and reclamation. Please see Appendix A in this <br /> response which has updated Exhibit E Maps (revised Pages 26-28). Please also see <br /> Appendix B in this response, which has added pages for Exhibit C (new Pages 20A and <br /> following) and Exhibit D, (new Pages 24A and following). The changes are intended to <br /> address increased traffic safety by improving visibility at the intersection, simplify the <br /> realignment and detours during construction, and better control drainage and erosion <br /> during mining and construction. <br /> In some cases, slopes greater than 31-1:1 V may be mitigated by use of terraces and slopes <br /> armored with rock, so that the grassed slopes can be 3H:1 V. In such cases, broadcast <br /> seeding may be used due to relatively confined dimensions. If this is done, the Division <br /> will be notified in advance of such a need, and seed mix totals will be adjusted. <br /> Generally, we will avoid backfill as much as possible, as well as terracing and armoring. <br /> 1.5 Minimally Affected Areas and Wetlands. <br /> Wetlands: Exhibit B Wetlands Map (Page 13) shows wetlands: <br /> a. Along the full length of the river to the north and west, much of which is downhill and <br /> some of which is downstream of the affected area. As discussed above, many of these <br /> are not natural wetlands but are sustained by irrigation return flows. None of these are <br /> located in affected land. <br /> b. Along the unnamed drainage flowing from further east on the Dancing Winds Ranch, <br /> touching the SE corner of the affected area, and flowing through a culvert under Piedra <br /> Road to discharge into the river. (This is identified as a thin light green line marking <br /> Freshwater Emergent wetlands on the Wetlands Map.) The triangle of 0.13 acres is <br /> located within the permit boundary and on the affected land, and identified as"minimal <br /> disturbance on Figure C.3 (Page 20)and in Exhibit E (Pages 26-28)because although <br /> there will be no excavation of construction materials in that area, storm water controls <br /> (as described in Exhibit C) will be installed to protect the wetland and drainage from <br /> sedimentation/deposition and other negative impacts. <br /> c. A freshwater forested/shrub wetland (approximately 1 acre) is located on USFS land <br /> between the permit area and the river to the north of the northwest corner of and <br /> OUTSIDE the affected area. (This is protected from sedimentation/deposition and <br /> other negative impacts by the 0.50 acre triangle of "minimal disturbance" in the <br /> northwest corner of the permit area/affected area shown of Figure C.3 (Page 20) and <br /> Exhibit E. This area will be used to install storm water controls (as described in Exhibit <br /> 5182-22-003 WASTELINE, INC. Page 5 of 107 <br />