2011-01-07_REVISION - M1980041 - Laserfiche WebLink

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REVFGETATION REC NMOATIONS Rock Gulch Gravel Pit The area in question is approximately 9.8 acres in size. Slopes are gently sloping to steep with a northwesterly aspect. Average annual precipitation in the area is about 10 to 12 inches. The existing native vegetation is some- what sparse, reflecting the low precipitation. The lower and flatter slopes are dominated by rabbitbrush with blue grams, Indian ricegrass, bottlebrush squirreltail, and annual weeds present. The steeper slopes are dominated by Pinyon pine and juniper with traces of mountain mahogany and the above named plants present. Based on the above information and soils present, the following seeding mix is suggested: S eP cies Variety *Pounds PLSAcre Indian ricegrass Paloma 4.6 Blue grama Iovington 1.0 Streambank wheatgrass Sodar OR 3.7 Thickspike wheatgrass Critana * PIS - Pure Live Seed (Purity X Germination) The above rates are based on drilling. If seed is broadcast, rates should be doubled. Scattered seedlings of Pinyon pine and Rocky Mountain juniper could also be planted randomly to create a more natural appearance. Before seeding, the area should be fertilized according to soil test recom- mendations and the soil tilled to a depth of 4-6 inches followed by a firming operation. Manure incorporated into the soil surface would improve organic matter content and water holding capacity and should be considered. Mulching after seeding would be beneficial. It would help retain soil moisture and prevent erosion. Native grass hay of local origin is recommended. It should be free of any noxious weeds. At least 50 percent of the mulch should be 10 inches or more in length. Small grain straw should be avoided as volunteer grain may create excessive competition for new seedlings. Approximately 4,000 pounds of air dry mulch should be applied per acre. It should be uniformly spread and "crimped in" to tie mulch to the soil.