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ADDENDUM ALLUVIAL VALLEY FLOOR RECONNAISSANCE • OF THE COLORADO WESTMORELAND INC. PROPOSED LEASE AREA Colorado Westmoreland Inc. (CWI) obtained the services of Westmoreland Resources Inc. (WRI) personnel and CWI assisted in the Alluvial Valley Floor reconnaissance. Westmoreland Resources Inc. personnel were Mathew S. Tudor, Coal Geologist, and Michele D. Mitchell, Environmental Coordinator - Field Programs. Mr. Tudor was employed by WRI in 1971 and is responsible for exploratory drilling, mapping, and hydrologic monitoring. Prior to that time, he was employed as a Petroleum Geologist. Ms. Mitchell was employed by WRI in 1978 and is responsible for wildlife, vegetation, and air quality monitoring, Prior to 1978,, she worked for various governmental agencies. CWI personnel assisting in this study were James V. Roberts, Geologist, and Kathleen G, Welt, Environmental Specialist. Prior to Division approval of the permit application, several camnents required clarification. Further information on how the AVF investigation was conducted, including maps of the study area, and additional mapping of AVF along the North Fork was requested. In conjunction with P9r. Vladimir Straskraba of Hydro-Ceo Consul Ling, Colorado Westmoreland Znc, has prepared the foll awing information. The Alluvial Valley Floor reconnaissance of the permit area was conducted during September, 1983, by CWI and WRI technical personnel. The investiga- tion included the entire permit area and peripheral areas inclusive of; West Fork Terror Creek, Terror Creek, Steven's Gulch, East Roatcap and West Roat cap Cheeks. Grassy, meadowlike openings occurring throughout the permit area were investigated. Geanorphology and vegetation were inspected and mapped in the field employing standard procedures. Extensive field verifi- cation was accomplished at all potential Alluvial Valley Floor sites. In addition, the review of aerial photographs and previous studies of geologic, hydrologic, soils, and vegetation was canpleted. The U.S. Soil Conservation Service also conducated a brief reconnaissance of the permit area to evalu- ate soils, range, and vegetative information. The area of investigation was the entire permit area as depicted on Map No. 2-2. Within and adjacent to the permit area, this study concluded that except for the North Fork of the Gunnison River, Alluvial Valley Floor areas are not present. Map No. 2-2 presents the surficial geology of the study area. Only several limited areas within the drainage basins of the Terror Creek, Steven's Gulch, and East Roatcap Cheek were designated as Quarternary Alluvium- Colluvium (Qac) . A detailed study of the largest and matt likely to be designated an AVF of these areas in Steven's Gulch indicated that these areas do not qualify for a designation of AVF because of the elevation (short growing season), absence of subirrigation species, and the depth of thg wateYn table. In addition, P1ap No. 5-2 was prepared. This map covers the Alluvial Valley F1 oor of the North Fork of the Gunnison River between Terror Creek and Love Gulch drainages. This map is based on geanorphologic mapping in the north- east part of the area, published topographical, surficial geologic maps, soils maps, and aerial photos where available. No detailed field verifica- tion was performed in the southwestern part of the area; h avever, the avail- able materials are sufficient for the purpose of this study, showing CWI'S impact on the quality and quantity of water and affect to the North Fork AVF .