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RPR-28-2005 13 48 Lafarge Metro Land <br />303 657 4037 <br />P.03 <br /> <br />Weed Control Methods ~ I `'~ <br />'~ <br />Monitorina/EyaluatlnrJRcnortna. Monitoring of weed populations is an integral part of ~, ' `' <br />the weed control program. This work will consist of examining all parts of the permit area and <br />Identifying areas where weed control is needed. This information will be used to develop an <br />annual weed control plan that will describe what needs to be done, where different types of <br />control will be implemented, when different control measures will be accomplished and bow the <br />program will be conducted. Decisions on the annual program (based on site reconnaissance) will <br />be made in late sp~tng in order to make sore that weed control plans csa be developed. <br />Additional site visits doting the yeaz may be necessary to evaluate the success ofthe control <br />measures and to prepare recommendations for any late season weed control that may be <br />necessary. „ `~: <br />After each year of treatment, the success of the various programs wiil"be evaluated. This ? ,: <br />process will consist of examining the treatment areas as well as keeping records of what , , <br />treatments were applied in each area. ' <br />Herbicide Aonlication. A wide range of herbicides is available for control of weed <br />species. Herbicide application will be used primarily for perennial fort species like Canada <br />thistle, field bindweed, white top and pendonial peppetgrass. All of these species spread by <br />underground sterns (rhizomes) and aze difficult to control without the use of herbicides. Mowing <br />may reduce their viability during a growing season, however it is not an effective approach to ' , ' <br />t+educing their abundance. These species occur throughout the pentuit area, but may be of greatest , <br />concern on areas that will not be mined and on reclaimed areas. Control on these sites will need , , <br />to focus on the use of herbicides. On areas that will be mined, mowing could be used as the <br />primary method of control, since the sites will be destroyed during the mining process. Herbicide <br />applications tray also be used on stands of pernicious annual species like diffuse knapweed atler <br />they have been mowed. <br />Tamarisk will be controlled by the use of the herbicides Arsenal aid Habitat. Habitat <br />will be used in areas where spray will come in contact with water; it is approved for use in and <br />azound standing and flowing water, The spraying will occur before the end of September, as the <br />herbicides are foliar applications sad only effective while the plant has green leaves, Fltttu~e ' <br />applications, if necessary, will occur during the late summer and/or early fall. , <br />Russian Olive will be cut down, the freshly cut stump will be treated with Gazlon or , <br />similaz herbicide. If areas of dense mature trees exist, the stand will be treated with a foliaz <br />application of Arsetral as described for the treatment of tamarisk , <br />'„ ;,. <br />Mowing. Mowing can be an effective means for reducing populations of annual weed ' ;~• <br />species. Even when mowed, annual species can still produce flowers and seeds, however the , ' ; <br />number of flowers is greatly reduced. The effectiveness of this approach can be enhanced by <br />mowing when the weeds are just beginning to flower. At this time, most of the overall plant <br />height has been attained and the impact of mowing can be maximized Annual weed species do <br />best on sites with limited amounts of vegetation and open bare soil. These conditions exist on , <br />newly reclaimed areas, on disturbed roadsides and in operations areas. Mowing will be <br />conducted using a rotary/bnuh hog type mower. <br />Temporary Seedine. Temporary seeding will be used for topsoil stockpiles as means of <br />creating a stable vegetation cover composed of perennial species rather than allowing these sites , <br />to develop populations of weedy species. The seed mix for areas of this type (azeae that will be , , <br />left undisturbed for more than one growing season) will consist primarily of native species. For " <br />stockpiles or sites that wit[ be re~isturbed within six months, a cover crop, such as wintergraze, <br />