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It is not currently used but if required a pipe will be installed as shown to allow clean water to flow <br />into the creek. <br />The primary non -potable water use at the quarry is for cooling, dust control and flushing of the saw <br />cuttings from the diamond wire saw and chain saw. Six diamond wire saws and four Fantini machines <br />are currently used for the production. Each saw consumes an average 5 gallons of water a minute. <br />This rate is not consumptive since the water is reused from settling ponds and sumps in the quarry. <br />Water from seepage into the quarry from surrounding formations is the source of this circulating, <br />non -potable water requirement. Potable water is brought to the site as required. Sanitary waste <br />facilities are portable toilets and do not require water. <br />A well permit was issued by the Colorado Division of Water Resources (Permit # 034872-F). The <br />excavated portion of the quarry is classified as a "well". There has been no reported effect on existing <br />water rights from past operators or Colorado Stone, and none is expected in the future. <br />1. Baseline Data <br />Table 1 NOAA Atlas 2 Precipitation Frequency Data Output <br />Map <br />Precipitation <br />(inches) <br />Precipitation Intensity <br />(in/hr) <br />2 -year 6- <br />hour <br />10 -year 6- <br />hour <br />1.02 <br />0.17 <br />1.6 <br />0.27 <br />100 -year 6- <br />hour <br />[i0ear24- <br />hour <br />2.35 0.39 <br />3.23 <br />0.12 <br />2. Assumptions used for Hydrology Calculations <br />The following assumptions have been utilized for the drainage calculations: <br />• Runoff Curve Number: 89 Group D (all of the site is considered exposed rock or loose <br />moraine). This is very conservative in the forested areas. <br />• 100 -year event (to allow for permanent installation) <br />• Runoff Rainfall: 3.23 inches <br />• Storm Type II <br />The Pride of America DRMS 112c Exhibit G - 2 <br />12/23/15 <br />