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NORTH DELTA PIT WEED CONTROL PLAN <br />Introduction <br />This document addresses issues related to weed control at the North Delta <br />aggregate mining site, operated by Lafarge West, Inc. Weed control is an issue <br />associated with lands in all stages of the mining process including lands occumng within <br />the permit azea that will not be mined, lands that have not yet been mined, disturbed areas <br />that are not yet reclaimed or aze part of the operations site, and lands that have been <br />reclaimed. Each of these particulaz areas presents different weed control challenges. The <br />areas that will not be mined contain primarily perennial weed species that became <br />established on the site during the yeazs when the land was primarily used for agricultural <br />purposes. <br />The primary approach for controlling the weeds in these areas will be application <br />of herbicides. Control of weeds in undisturbed areas, disturbed azeas, operations areas, <br />product stockpiles, and topsoil stockpiles will be accomplished through herbicide <br />application at the times when particular weed species will be most susceptible to <br />treatment. A single treatment will not be sufficient, and ongoing herbicide application <br />will be necessary and will be completed to significantly reduce and eliminate the weed <br />populations. Amore detailed description of the weed treatment method is described in <br />the following section. <br />Weed Species of Concern <br />Typically, the weed species of concern include some or all of the following species: <br />Table 1. <br /> <br />Scientific Name <br />Common Name Distributional <br />Status <br />Growth Form <br />Cirsium arvense Canada Thistle Introduced Perennial Forb <br />Cardaria drabs Whiteto Introduced Perennial Forb <br />Le idium latifolium Perennial Pe er rass Introduced Perennial Forb <br />Convolvulus arvensis Field Bindweed Introduced Perennial Forb <br />Centaurea diffusa Diffuse Kna weed Introduced Annual Forb <br />Carduus nutans Noddin Bristle Thistle Introduced Biennial Forb <br />Sisymbrium <br />altissimum Tumbling Hedge <br />Mustard <br />Introduced <br />Annual Forb <br />Descurainia s Tans Mustards Introduced Annual Forb <br />Verbascum tha sus Common Mullein Introduced Biennial Forb <br /> <br />Tamaris ramosissima <br />Tamarisk <br />Introduced Deciduous <br />Shrub <br />Elaeagnus <br />an ustifolia <br />Russian Olive <br />Introduced Deciduous <br />Shrub <br />Centaurea repens L. Russian Knapweed Introduced Annual Forb <br />