Laserfiche WebLink
RULE 2 - PERMITS <br />forbs encountered in this vegetation type include devil's shoestrings (Polygonum aviculare) and <br />• common dandelion (Taraxacuin offa`cinale). Native annual and biennial forbs are represented by <br />Douglas knotweed (Polygonum douglasii). <br />Mixed Conifer - The mixed conifer vegetation type was confined to a single stand on a steep <br />north -facing slope, in a narrow canyon area within the baseline vegetation study area just south <br />of the Seneca II Permit Boundary. This vegetation type is dominated by a mix of conifer trees <br />including sub -alpine fir (Abies bifolia) and Douglas -fir (Pseudotsuga menziesii). The understory <br />is comprised of Rocky Mountain maple, Saskatoon serviceberry, pearly everlasting (Anaphalis <br />margaritacea), sugarbowls (Coriflora hirsutissima), Engelmann aster (Eucephalus <br />engelmannii), common juniper (Juniperus communis ssp. alpina), Oregon hollygrape (Mahonia <br />repens), Agassiz bluegrass, muttongrass (Poa fendleriana), fowl bluegrass, wartberry fairybells <br />(Prosartes trachycarpa), and thimbleberry (Rubacer parviflorum). <br />Vegetation Cover in the Disturbed Area <br />Map 2.04.10-M2, Vegetation - Surface Disturbance Area, illustrates the location of the sagebrush <br />grassland, mountain brush, reclaimed mined land, mesic drainage/wetlands, road/facilities, and <br />water cover types in the PSCM disturbance area incidental to underground mining activities. ESCO <br />had identified approximately 5.4 acres of the mesic drainage/wetlands cover type within this PSCM <br />surface disturbance area. The majority of the mesic drainage/wetlands cover type within this <br />disturbance area is associated with wetlands that established in reclaimed areas in the central <br />portion of this proposed disturbance area. The remaining smaller portions of this cover type are <br />present in the northern end existing shop facilities and in the southern end of the proposed PSCM <br />is disturbance area that were artificially created due to water flowing from the Pecoco Pond and <br />proximity to culvert crossingsibackwater. The water supply from Pecoco Pond that resulted in a <br />moist variation of the sagebrush grassland cover type will be routed into the mine's water control <br />treatment facilities at Pond 002. It is anticipated that these areas will again resemble the majority of <br />the sagebrush grassland cover type as more xeric conditions return. There is only a small portion of <br />the 5.4 acres of the mesic drainage/wetlands type that is a moist variation of the sagebrush grassland <br />cover type. The wetlands shown on Map 2.04.10-M2 were delineated in the fall of 2009 as per <br />Army Corps of Engineers guidance and procedures (see Exhibit 2.04.10-E2). <br />Other cover types affected by the proposed underground mine operations include those associated <br />with Seneca II road and facility disturbances and water. These cover types have been reclassified as <br />non -vegetation cover. Table 2.04.10-T2 provides a summary of acreage and percent cover of the <br />cover types within the proposed disturbance area incidental to underground mining operations. <br />Table 2.04.10-T3 presents the three major vegetation types established within the PCSM <br />disturbance area that underwent quantitative sampling for cover and production, along with <br />associated sampling parameters. As previously indicated, the Mined and Reclaimed Type includes <br />portions of the Seneca II Mine BRB 2 and BRB 3. <br />Quantitative cover and production data were also collected in the two existing vegetation reference <br />area vegetation types associated with the Seneca II Mine. Table 2.04.10-T4 presents the sampling <br />parameters associated with the reference area samplings. <br />PSCM Permit App. 2.04-140 Revision 03/05/10 <br />