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Dowe Flats Quarry Noxious Weed Management Plan <br />2 Site Description <br />The CEMEX Dowe Flats Quarry is located in Boulder County approximately 2 miles east of the <br />Town of Lyons at 13301 55th Street, Lyons, CO 80503. The Dowe Flats Quarry includes 1854.54 <br />permitted acres under DRMS Permit 4M-1993-041. This property is being actively mined with <br />concurrent reclamation activities taking place as well. The majority of the permitted area has <br />been transferred to Boulder County and is no longer under CEMEX's management control. The <br />remaining approximately 720 acres are either undisturbed, being actively mined, or have been <br />temporarily or permanently reclaimed to the post -mining land use of rangeland. As of the time of <br />this writing over 250 acres have been reclaimed. <br />Vegetation presently on the site consists of native grasses and forbs and introduced grasses and <br />forbs, including noxious weeds. Noxious weeds occur throughout the site and infestations are <br />heavy in some areas. Noxious species include Canada thistle (Cirsium arvense), musk thistle <br />(Carduus nutans), diffuse knapweed (Centaurea diffusa), Dalmatian toadflax (Linaria <br />dalmatica), common teasel (Dipsacus fullonum), bull thistle (Cirsium vulgare), Russian olive <br />(Elaeagnus angustifolia), salt cedar (Tamarix spp.), common mullein (Verbascum thapsus), field <br />bindweed (Convolvulus arvensis), and cheatgrass (Bromus tectorum). This description is based <br />on previous weed management reports and an August 2015 visual evaluation of the site. A list of <br />noxious weed species known to occur in Boulder County and potentially occur within the project <br />area is 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 (Melilolus officinali.$). <br />Construction and mining activities on the site have the potential to introduce new noxious weed <br />species to the site, or 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 />