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Feb•28. 2001.12 06PM TUTTLE APPLEGATE No 3552 P. 5/1 <br />The stream depletion model for well 19808-R was developed under the following assumptions: <br />The estimated distance from the alive stream was 4500 feet. <br />• The transmissivity was assumed as 45,000 gaUft/day. This value was assumed to be the same <br />as the average transmissiviry value for a test well in the area. Source: Groundwater Citculaz <br />No. 11, Location C1-67-35 add2 (Appendix H). <br />• The specific yield was assumed to be 0.2, which is typical for ao alluvial aquifer. <br />• The location of the parallel impermeable boundary was assumed to be a distance of <br />approximately iZ000 feet from the live stream. Source: USGS Depth to the Water Table in <br />the Greater Deaver Area, Front Range Urban Corridor, Colorado. <br />FUI.TON DTTCH SHARES <br />Lafarge owns 25 Fulton Ditch shazes historically used on the Howe Pit site. This property is no <br />longer irrigated due to the mining operation The historic consumptive use for the Fulton Ditch <br />shares was determined using the approach taken from 82CW393 which changed Fulton Shares <br />from irrigation to augmentation and makes the following assumptions: <br />• Fulton Ditch river headgate diversions are based on average monthly values for the period <br />1976-1488. <br />A 10% conveyances loss from the river headgate to the Farm headgate. <br />• The monthly consumptive use was based on a farm irrigation efficiency of 50%. <br />This results in a consumptive use credit of 43.9 acre-feet for the 25 shares or 1.75 acre-feet per <br />share (Table 3). 'T'his is as accepted consumptive use value for this ditch. <br />1~e historic subsurface return flows associated with the 25 Fulton Ditch shares were modeled <br />using a stream depletion model for the land formerly irrigated with these shams. <br />• The centroid of the Howe property formerly irrigated with the 25 Fulton shares is <br />approximately ]400 feet from the South Platte River. <br />• The transntissivity was assumed as 45,000 gall@/day. This value was assumed to be the same <br />as the average transnaissivity value for a test well in the azea. Source: Groundwater Circulaz <br />No. 11, Location C1-67-35 add2 (Appendix B). <br />• The specific yield was assumed to be 0.2, which is typical for an alluvial aquifer. <br />• The location of the parallel impermeable boundary was assumed to be a distance of <br />Page 4 <br />