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NORTH DELTA PIT WEED CONTROL PLAN <br />[ntroducNon <br />This document addresses issues related to weed control at the North Delta aggregate <br />mining site operated by Lafarge West, Inc. Weed control is an issue associated with lands in all <br />stages of the mining process including lands occurring within the permit area that will not be <br />mined, lands that have not yet been mined, disturbed areas that are not yet reclaimed or are part of <br />the operations site, and lands that have been reclaimed. Each of these areas poses different <br />situations relative to weed control. The areas that will not be mined contain primarily perennial <br />weed species that became established on the site during the years when agricultural was the main <br />land use. The primary approach for controlling these weeds will be application of herbicides. <br />Areas within the permit area that have not yet been mined contain weed species comparable to <br />areas that will not be mined, however, weeds in these areas will be best controlled by mowing <br />rather than by herbicide application. Disturbed areas that have not yet been permanently <br />reclaimed such as roadsides, operations areas, product stockpiles and topsoil stockpiles may <br />support a variety of weed species. Control of weeds on these sites will be accomplished using a <br />variety of techniques including mowing, application of herbicides, temporary seeding and timely <br />turnover of products. Reclaimed areas may also support a variety of weed species. Weeds on <br />these areas will be controlled with mowing, application of herbicides, burning, if feasible or <br />combinations of the above treatments. Descriptions of these weed control approaches aze <br />described in more detail in a following section. <br />Weed Species of Concern <br />Typically, the weed species of concern include some or all the following annual and <br />perennial species: <br />Scientific Name Common Name Distributional <br />Status Growth Form <br />Cirsium arvense Canada Thistle Introduced Perennial Forb <br />Cardaria draba White Top Introduced Perennial Forb <br />Lepidium latifolium Perennial Peppergrass Introduced Perennial Forb <br />Convolvulus arvensis Field Bindweed Introduced Perennial Forb <br />Centaurea diffiesa Diffuse Knapweed Introduced Annual Forb <br />Carduus nutmzs Nodding Bristle Thistle Introduced Biennial Forb <br />Sisymbrium altissimz~m Tumbling Hedge Mustard Introduced Annual Forb <br />Descurainia spp. Tansy Mustards Introduced Annual Forb <br />Yerbascum tha sus Common Mullein Introduced Biennial Forb <br />Tamaris ramosissima Tamarisk Introduced Deciduous Shrub <br />Elaea us an zsti olia Russian Olive Introduces Deciduous Tree <br />All of these species are adapted to disturbed conditions such as those that occur on <br />mining sites or agricultural lands. All of these species were introduced into the region at various <br />times beginning in the late I S00's and have expanded into a variety of habitats. <br />At the North Delta Pit, the primary species of concem is diffuse knapweed and Tamarisk. <br />