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Transit Mix Concrete Co. <br /> Public Health and Environment. Transit Mix commits to obtaining the permit before any <br /> water can be discharged to Little Turkey Creek. <br /> 73) In Attachment G-2, on page 1-2, Hydro-Logic Solutions, Inc. states that mining activity <br /> will intercept groundwater in the south ridge area, mostly in the form of seepage along the <br /> western and southern highwalls, and is projected to result in mine inflows ranging from less <br /> than 10 gpm to about 50 gpm over most of the 40-year mining operation, with a peak <br /> inflow of about 100 gpm at maximum excavation. Does the operation anticipate the mine <br /> inflow to create any issues with slope stability of the western and southern highwalls or <br /> with reclamation of highwall benches? <br /> Response: Seepage waters from the remaining highwalls is not expected to adversely <br /> impact stability or reclamation of highwall benches. The pit wall stability evaluation <br /> included in Exhibit 6.5 demonstrated that the pit walls are stable even under saturated <br /> conditions. The benches will be backfilled with fines material, which is considered to be <br /> well-drained. Any seepage water is expected to remain at the contact between bedrock and <br /> the fines material and not adversely impact the bench stability. <br /> 74) In Attachment G-2, on page 1-4, Hydro-Logic Solutions, Inc. states that water will be <br /> trucked to the site daily for use by the operation. However, previous text in Exhibit G states <br /> that water will be stored on site for use by the operation. Please provide clarification or <br /> correction(s) if needed. <br /> Response: Attachment G-2 has been revised to address this comment. Transit Mix <br /> estimates that the operation will require varying amounts of water depending on the time of <br /> year and weather. Water will be hauled from Colorado Springs on an as-needed basis; <br /> Transit Mix estimates this will require an average of 4 to 6 truckloads per day using a 6,000 <br /> to 7,000-gallon tanker truck. Transit Mix plans to install 2 cisterns to hold water hauled <br /> from Colorado Springs: 1 — 5,000-gallon cistern at the scale house and 1 — 15,000-gallon <br /> cistern at the plant site. <br /> 75) In Attachment G-2, on page 2-17, Table 2-3 includes domestic wells in the vicinity of the <br /> proposed quarry. Please add well permit numbers in this table so the wells can be <br /> correlated with the well locations shown in Figure 2-11. <br /> Response: Table 2-3 in Attachment G-2 has been revised to include well permit numbers. <br /> 76) In Attachment G-2, Table 3-3 compares groundwater quality results for the monitoring <br /> wells installed on site with Segment 14d Standards for surface water (Little Turkey Creek). <br /> The groundwater quality data should be compared with groundwater standards. Please refer <br /> to Item No. 69. <br /> Response: Table 3-3 in Attachment G-2 has been updated to compare the data to <br /> groundwater standards. <br /> Hitch Rack Ranch Quarry(M-2017-049) <br /> Response to Comments—March 9,2018 <br />