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Lyons Quarry Noxious Weed Management Plan <br />2 Site Description <br />The CEMEX Lyons Quarry is located in Boulder County approximately 2 miles east of the <br />Town of Lyons at 5134 Ute Highway, Lyons, CO 80503. The Lyons Quarry property is 979.54 <br />acres and is permitted with DRMS as Permit #M-1977-208. While this property is no longer <br />being actively mined there is an active cement plant and kiln with material processing areas and <br />an open pit that is being backfilled with kiln dust per the DRMS permit. The majority of the <br />property is either undisturbed rangeland that is leased for agricultural grazing (approximately <br />400 acres) or areas which have been reclaimed including a 42 -acre fresh water pond and over <br />360 acres of revegetated native rangeland. Several irrigation ditches and the St. Vrain River also <br />cross the property. <br />Vegetation presently on the site consists of native grasses and forbs, introduced grasses and <br />forbs, and noxious weeds. Noxious weeds occur throughout the site and infestations are heavy in <br />some areas. Noxious species include Canada thistle (Cirsium arvense), musk thistle (Carduus <br />nutans), diffuse knapweed (Centaurea diffusa), Dalmatian toadflax (Linaria dalmatica), <br />common teasel (Dipsacus fullonum), bull thistle (Cirsium vulgare), Russian olive (Elaeagnus <br />angust{folia), salt cedar (Tamarix spp.), common mullein (Verbascum thapsus), field bindweed <br />(Convolvulus arvensis), and cheatgrass (Bromus tectorum). This description is based on previous <br />weed management reports and an August 2015 visual evaluation of the site. A list of noxious <br />weed species known to occur in Boulder County and potentially occur within the project area is <br />contained in Appendix A. With the exception of field bindweed, cheatgrass, and common <br />mullein, management of these species is required by the State of Colorado. CEMEX also <br />manages for large infestations of other nuisance weeds if they are inhibiting establishment of <br />desirable plant communities including kochia (Bassia scoparia), Russian thistle (Salsola tragus), <br />and yellow sweet clover (Melilotus officinalis). <br />Construction and grazing activities on the site as well as water movement in irrigation ditches <br />and the St. Vrain River have the potential to introduce new noxious weed species to the site, or <br />spread existing species on to or off of the site. <br />3 Noxious Weed Rules and Regulations <br />The Colorado Noxious Weed Act designates noxious weed species for management and <br />eradication as categorized on the Colorado Noxious Weed List. List "A" species are required by <br />state law to be eradicated, and list "B" species are those for which the state has developed or is <br />currently developing a management plan. List "C" species are widespread and known to be <br />problematic, but management is not legally required. However, management of list "C" species <br />may be beneficial to promote improved native vegetation establishment and prevent other site <br />problems. <br />Boulder County's Noxious Weed Management Plans adopts the list designated by CDA. <br />However, Boulder County's weed management plan identifies certain "B" list species that are <br />designated for containment and suppression. These lists allow prioritization of weed <br />management activities on the CEMEX site. The state and county weed list is provided in <br />Appendix A. The Colorado Noxious Weed Act, rules pertaining to the Act, the state weed list, <br />and state management plans can be found at: <br />http://www.colorado.gov/cs/Satellite/ag Conservation/CBON/1251618780047). <br />Habitat Management, Inc. 3 September 2015 <br />