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- • July 1993 -27- 923-2515 5.2.7 Native Rangeland Native rangeland occurs continuously along Unnamed Draw. This rangeland is similar to the rangeland along Grassy Creek as described in Section 5.1.7. The native rangeland areas along the Unnamed Draw are in the claypan and brushy loam range sites. The brushy loam range site was described in Section 5.1.7. The claypan range site is characterized by alkali sagebrush with a sparse herbaceous understory composed of grasses and forts, such as western wheatgrass, prairie Junegrass, bluebunch wheatgrass (Agropyron spicatwn), weedy milkvetch (Astragalus sp.), and sharptip onion (Allium acuminatum). The productivity for this range site varies from 300-500 pounds per acre in median years. The range condition is poor today because of heavy use by sheep. • 5.3 Armand Draw 5.3.1 Stream Flow. Ground Water. and Water Quality Armand Draw is an intermittent sveam. Flow data from station YSAF4 (Figure 2) indicates only one flow (0.40 gallon per minute) during 12 monitoring periods extending from May 14, 1991 to August 19, 1992 (Table 5.19). Surface water quality data available from this same station (Table 5.20) are similar in quality to the sites located in upper Grassy Creek. The conductivity of 1.24 mmhos/cm is slightly higher than the material damage suspect level of 1.0 mmhos/cm for the Yampa basin. The value for boron (0.1 mg/1) and chloride (15 mg/1) are below the suspect level of 0.5 mg/1 and 250 mg/1, respectively. The pH is 8.35, and as discussed earlier there is no adverse effect for the pH dependent aluminum, manganese, nickel, and zinc. The values for arsenic, cadmium, copper, lead, molybdenum, and selenium are below material damage suspect levels. • Ground water quality data (Table 5.21) in Armand Draw is from a permanent monitoring station, YAAL14 in upper Armand Draw. The conductiviry,(2.036 mmhos/cm) is above the suspect Golder Associates