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A number of Colorado designated noxious weeds were found during the 1987 and again in the <br />1999 vegetation surveys. The presence of these noxious and restricted weeds is not <br />unexpected due to the intensive agricultural activities and large amount of disturbed areas <br />within the study area. There were six prohibited noxious weeds encountered during the 1999 <br />studies. They are: <br />Field bindweed <br />Jointed goat grass <br />Canada thistle <br />Hairy whitetop <br />Russian Knapweed <br />Musk Thistle <br />(Convolvulus arvensis) <br />(Aegilops cylindrica) <br />(Cirsium arvense) <br />(Cardaria pubescens) <br />(Centaurea repens) <br />(Cardus nutans) <br />In addition four restricted noxious weeds were also found. They are: <br />Curly dock (Rumex crispus) <br />Blue lettuce (Lactuca pulchella) <br />Buckhorn plantain (Plantago lanceolata) <br />Quackgrass (Agropyron repens) <br />The above noxious weeds were determined from Appendix B to CDMG draft "Guidelines for <br />Compliance with Land Use and Vegetation Requirements for Coal Mining". <br />6.2 Irrigated Pasture Type (IP) The irrigated pasture has been cleared of native vegetation <br />and planted to grasses and forbs by the various farms in the study area. All the irrigated <br />pastures are irrigated by means of flooding the fields from ditches. Irrigated pastures vary from <br />abandoned to highly productive. Some pastures, where irrigation water stands for prolonged <br />periods, is dominated with sedges and rush. Other abandoned pastures are dominated with <br />annual, bi-annual and noxious weeds. One pasture was owned by Benson. It had been <br />irrigated in the 1999 season and had little to no grazing influence. <br />Perennial grasses dominated the irrigated pasture type with vegetative cover of 44.5 percent, <br />while perennial forbs accounted for nearly all of the remaining vegetative cover (33.3 percent). <br />February 2015 (TR -66) 2.04.10-56 <br />