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The 273.3 acre-feet of water diverted through the <br />Highline Canal vas historically used to irrigate seventy-four <br />(7a) acres of pasture grass and alfalfa on the tract of land <br />identified in Figure 3 as 262-007. IIsing the modified <br />Blaney-Griddle Method (Reference 2) and temperature (Table 4) <br />and precipitation (Table 5) data for Nucla as derived from <br />the Norwood and Uravan weather stations (figure 1), the <br />average annual consumptive use of irrigation eater <br />historically used on the 74 acres vas calculated to be 114.5 <br />sore-feet for the period 1970-1986 (Table 9). The temp- <br />erature and precipitation values used in the calculations <br />were the averages of data from the two stations. The <br />modified Blaney-Griddle method 3s the standard accepted <br />method used to calculate consumptive-use requirements for <br />crops in Colorado. <br />• <br />PCC therefore has a consumptive-use credit of 114.5 <br />acre-feet of water previously used for irrigation to use as <br />a water supply for the mining operation and in the <br />augmentation plan.- The existing rights vill hovever have to <br />be changed to include industrial use and storage. Storage <br />rights associated vith the six ponds vill also be used as a <br />water-supply source during the non-izrigation season, as no <br />consumptive-use credit is available during the months of <br />November through March. <br />22 <br />GC07RAN5. INC. <br />• Attachment 2.05.3(3}16-67 <br />RE~'1SED MARCN 2006 <br />