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6.4.10 Exhibit J -Vegetation Information <br />Table 1. Vegetative productivity (Source: USDA Soil Conservation Service, <br />1980). <br />Soil type Productivity in Favorable Productivity in <br />Years (Ibs/ac) Unfavorable Years <br />(Ibs/ac) <br />Aquolls and Aquents, <br />gravelly substratum 3,000 2,000 <br />Aquolls and Aquepts, <br />flooded 4,000 3,000 <br />Bankard sandy loam, 0 to <br />3 percent slopes 2,500 1,500 <br />Nunn loam, 1 to 3 <br />percent slopes 1,600 1,400 <br />Threatened and Endangered Plant Species <br />The project site is within the range of one threatened plant species, Ute ladies' <br />tresses orchid (Spiranthes diluvialis). A presence/absence survey for this <br />species failed to find it present, and it was concluded that the species is unlikely <br />to occur on the site (ERO Resources, 2000b). The U.S. Fish and Wildlife Service <br />concurred with this finding in September of 2000 (Carlson, 2000). <br />References <br />Carlson, L. 2000. Letter from L. Carlson, U.S. Fish and Wildlife Service, to D. <br />Larson, ERO Resources. September 28, 2000. <br />ERO Resources, 2000a. Ecological assessment and site review for County Line <br />Reservoir, Weld County, Colorado. Submitted to Rocky Mountain <br />Consultants. Longmont, CO. Submitted to Rocky Mountain Consultants. <br />Longmont, CO. <br />ERO Resources, 2000b. Spiranthes diluvialis survey report. County Line <br />Reservoir Weld County, Colorado. <br />USDA Soil Conservation Service. 1980. Soil Survey of Weld County, Colorado <br />southern part. USDA Soil Conservation Service in Cooperation with <br />Colorado Agricultural Experiment Station. Greeley, Colorado. <br />Turnpike Mining Resource <br />Regular 112 application <br />