Laserfiche WebLink
• constructing a new 13.8-kV and a 138-kV power line to the west <br />portal area. These activities will be confined to areas on the <br />alluvium currently occupied by a riparian vegetation community <br />consisting of big sagebrush, greasewood, tamarac, bricklebush, <br />and willow. These areas can be classified as undeveloped range- <br />lands which are not significant to farming. <br />Assuming that the relocated county road will have an average <br />disturbed width of 30 feet, approximately 0.6 acres of alluvial <br />fill will be disturbed (a road length of 900 feet along the <br />alluvium). A water supply pipeline may affect another 1.4 acres <br />(assiming a disturbed area 1970 feet long and 32 feet wide). Thus, <br />• only about 2 acres will potentially be disturbed by surface facil- <br />ities on the White River alluvium. No excavation of the alluvial <br />material will be required for the construction of the relocated road. <br />Grasses and shrubs will be scraped off the road width and fill <br />placed directly on top of the alluvium. Thus, the alluvium will not <br />be disturbed. The installation of the water supply pipeline will <br />require shallow excavation for frost protection. This depth will <br />likely be less than the depth of subsurface water which is normally <br />greater than 6.0 feet. <br />Because surface facilities on the White River alluvial valley floor <br />will be located on undeveloped rangeland which is not significant <br />to farming, no adverse biological or economic impacts are expected. <br />• The essential hydrologic functions, both surface and groundwater, <br />4/81 II.D-21 <br />