Laserfiche WebLink
2.2.3 Water Retained in Product <br /> Consumption use associated with water retained in washed material was calculated based upon the <br /> percentages (by weight) outlined in the Guidelines. In summary, a 4% loss was calculated for material <br /> mined below the groundwater table and a 2% loss was estimated for material mined above the groundwater <br /> table. Of the 350,000 Tons that Everist estimates will excavate per year during 2017 and 2018, <br /> approximately 20% will be mined above the groundwater table; the remaining 80% will be excavated from <br /> below the water table. Calculations show that losses due to water retained in washed material will be <br /> approximately 9.3 AF per year(Table 4). <br /> Table 4 <br /> Estimated Water Retained in Product for 2017 and 2018 <br /> Mined Material Water <br /> Month Above Below Total in Washed <br /> GW GW Product <br /> (Tons) (Tons) (Tons) (AF) <br /> Jan 0 0 0 0.00 <br /> Feb 0 0 0 0.00 <br /> Mar 0 0 0 0.00 <br /> Apr 6,300 25,200 31,500 0.83 <br /> May 7,000 28,000 35,000 0.93 <br /> Jun 7,700 30,800 38,500 1.02 <br /> Jul 10,500 42,000 52,500 1.39 <br /> Aug 10,500 42,000 52,500 1.39 <br /> Sep 9,800 39,200 49,000 1.30 <br /> Oct 12,600 50,400 63,000 1.67 <br /> Nov 5,600 22,400 28,000 0.74 <br /> Dec 0 0 0 0.00 <br /> Total 70,0001 280,0001 350,000 9.27 <br /> 2.2.4 Water Consumption due to Concrete Batching <br /> Water consumption associated with production of concrete was calculated assuming an average of 30 <br /> gallons of water is needed to produce 1 CY of concrete. For 2017 and 2018, Everist estimates producing <br /> 65,000 CY of concrete each year; the associated water loss equals 6.0 AF. Table 5, below, shows the <br /> monthly distribution of water consumptive uses required for production of concrete. <br /> 2.2.5 Water Consumed by Concrete Truck Washing <br /> Historic records provided by Everist show that, on average, approximately 24.7 gallons of water per CY of <br /> concrete is needed to wash the concrete trucks. Water utilized to wash concrete trucks is collected from <br /> the wash area and available for reuse. A 10% consumptive loss factor is applied to the total water used <br /> during concrete truck washing operations. The estimated losses for 2017 and 2018 are 0.5 AF (Table 5). <br /> 2.2.6 Water Consumption by Asphalt Production <br /> Water consumption associated with the production of CDOT Asphalt at MCR is estimated at approximately <br /> 5 'agRESOURCE <br />