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Vegetative litter (prior years growth, dead wood, and other biologic organic material) . comprised an average 50.00 percent ground cover within the UDWP. Bare soil comprised 6.00 percent of the cover encountered, and rack was encountered 0.50 percent of the time. ToEesoii Pile The Topsoil Pile at the Lone Pine Gulch Surface Facilities Area is located immediately east of the UDWP and comprises approximately 0.5 acre of stockpiled topsoil from the development of the Lone Pine Gulch facilities. Based on mapping from the soil survey (SCS, 1981) the stockpiled topsoil is Fughes loam. The pile was revegetated in 1995, with the approved permanent revegetation seed mix and has been fenced to prevent unauthorized grazing by domesticated livestock. The Topsoil Pile was constructed on a moderate hillslope and exhibits sheet flow runoff to the north. Three lifeforms were documented during the sampling of the Topsoil Pile. These included graminoids, forbs, and woody plants. Seventeen plant species were identified during cover sampling at this location. Total vegetation cover of the Topsoil Pile was 60.67 percent, highest of the three areas sampled at the Lone Pine Gulch Surface Facilities Area. Based on cover sampling, graminoids represented 49.33 percent mean cover, forbs accounted for 9.33 percent mean cover, and three species of woody plants were represented, contributing 2.00 percent cover overall. • The dominant vasculaz plant species of the Topsoil Pile was Bromus inermis. Bromus inermis accounted for 14.67 percent of the mean cover. Three sub-dominant species provided significant cover. These species were all graminoid and included; Poa pratensis with 11.33 percent cover, Bromus tectorum contributing 10.00 percent cover, and Agropyron trachycau/um, which contributed 9.33 percent mean cover. Agropyron smithii (3.33% cover), Achillea lanulosa (2.67%), Polygonum douglasii (2.00%), and Lactuca serriola (prickly lettuce) (1.33`%) all contributed greater than one percent total cover. The three woody plants encountered were alJ native species, invading from the surrounding undisturbed oalcbrush vegetation community. Vegetative litter (prior years growth, dead wood, and other biologic oceanic material) comprised an average 33.33 percent ground cover. Bare soil comprised 6.00 percent of the cover encountered, and no rock was encountered. Staging Area The Staging Area at the Lone Pine Gulch Surface Facilities Area is located immediately east of the fan. The area sampled is a steep north-facing slope approximately 0.6 acres in extent which has been revegetated. The slope was revegetated in 1995, with the approved revegetation seed mix. The substrate in this area is significantly more rocky . than the other areas sampled, not unexpected as the surface material is subsoil. -4-