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• 5.0 NOXIOUS WEEDS i~ A list of noxious weeds for Delta County was developed by the Colorado Division of Minerals and Geology in 1998. Of the 21 noxious weed species listed, 11 were encountered within the vegetation study area. These taxa, the plant communities where they were observed, and their relative distribution are provided in the following table. Sdenflrk Name Common Name HlpaNt~ / Derelkt Bowie Wllltams Feature Irrlyafnd Wetland Orofgrd UtcFratd N Reid Arctium minus Burdock UC R VC VC l.C R Cardarra latitolia (drabs) Whitetop C UC l~ l~ Carduus nutans Musk Thistl R R R Centaurea (Acroptilon) repens Russian Knapweed l1C VR Cirsium (Braes) arvense Canada Thistl R C R R C Convdwlus arvensis Bindweed R UB UB UB UB UB Cynoglossum otircrnale Houndstongue VC C R R R UC Leucanthemum wlgare Oxeye Dais VR Linaria wl aris Yellow Toadflax VR Onopordum acanthium Scotch Thisll UC R R VR Tamarix ramosissima Salt Ced VR U B =Ubiquitous -always within view UC =Uncommon -occasionally observed within area V C =Very Common -uniform distribution within area R =Rare - 3 to 10 observations C =Common -scattered distribution within area V R = Ver Rare -one or two observations Perusal of the above table indicates an extensive presence of noxious weeds within the vegetation study area. It would be rewmmended that following project construction and during operations, an aggressive weed control program be initiated to ensure these species are reduced in numbers and extent or possibly eradicated from the reasonable proximity of the proposed project area. According to the Division of Minerals and Geology; bindweed, oxeye daisy, and salt cedar require secondary control measures while the remaining species require mandatory control measures. Furthermore, enforcement of weed control may be taken by the state at the operators expense if a noxious weed infestation is found during the permit period. An infestation is defined two ways. First, relative cover or composition of one noxious weed or a combination of noxious weeds is greater than 3°k in a revegetated stand. Or second, a patch of any listed species in which the noxious weed component exceeds 25% of the relative cover and occupies an area larger than 100 ttz on any disturbed area. These criteria are often exceeded in the baseline condition. This indicates that a noxious weed control program during operations and reclamation • phases should be implemented. ~QaDd14 ~~~ ~4Bt7, tNC. Page 28 Exhibit 5-Bowie Bazeline Vegetation Survey