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Transit Mix Concrete Co. <br /> quarry operation will not consume any water from the surrounding watershed and aquifers, and all <br /> water entering the watershed will pass through the quarry area with minimal delays and will continue its <br /> normal path beyond the quarry site. <br /> Surface Water <br /> Objection: Removal of vegetation will exacerbate flash flooding. The quarry cannot handle large storm <br /> events. <br /> Response: Removal of vegetation will increase runoff volumes in the quarry area, and these runoff rates <br /> and volumes were calculated in Exhibit G. Flooding of Little Turkey Creek and increases of runoff rates <br /> are prevented by the stormwater retention and sediment detention basins discussed in Exhibit G. These <br /> basins have been designed to comply with the stringent El Paso County Drainage Criteria Manual <br /> (EPCDCM) standards and regulations,which require containment of the 100-year storm event with <br /> discharge flow rates limited by an orifice plate at the outlet so that the total creek flow remains similar <br /> to pre-development flows. These designs and regulations were established to avoid the flooding of <br /> receiving streams such as Little Turkey Creek and Transit Mix has incorporated these requirements into <br /> the design of the quarry. <br /> Objection: Claims that the area has a "pristine creekbed". <br /> Response: The creekbed and riparian corridor will not be impacted by the quarry operations. As stated <br /> in the permit application,the quarry will remain a minimum of 100 feet from the creek and at least 10 <br /> feet above it in elevation. This offset area results in the quarry being entirely outside the floodplain and <br /> riparian corridor,which protects the creek from impacts, and more importantly, protects the riparian <br /> corridor important to wildlife in the area. The creekbed in the vicinity has been significantly disturbed <br /> by prior ranching operations. In the early 1900's, a dam was constructed adjacent to the project area, <br /> and this dam subsequently breached in the flood of 1921. The areas inundated with water upstream of <br /> the dam while it was operational, and the areas flooded downstream immediately following the dam <br /> breach were all significantly impacted by the failure of this structure. There is also a water diversion <br /> structure immediately downstream from the quarry area;this structure has impacted stream flows for <br /> over a century. The locations of the water diversions, historic dam,and other water infrastructure are <br /> shown on the attached Figure 1. <br /> Objection: The quarry is a threat to water resources/watershed in the area. <br /> Response: The objector includes no details on how the water resources or watershed is threatened. <br /> The discussion on water resources in Exhibit G demonstrates that impacts to the groundwater and <br /> surface water systems are minimized. The Colorado Department of Water Resources (DWR) concurs <br /> with this assessment as they provided a letter to the Division stating that groundwater impacts were so <br /> minimal that a well permit or substitute water supply plan (SWSP)are not necessary. There will be <br /> minimal impacts to the watershed as the quarry area is a small portion of the Little Turkey Creek <br /> watershed and runoff from affected areas is routed to the creek at limited flow rates. Water will <br /> continue to flow unimpeded in the creek,and sediment will be removed from runoff waters,thus <br /> Hitch Rack Ranch Quarry Response to Comments <br /> March 9,2018 4 <br />