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F <br />S <br />ALBERT ~I dl SONS, INC. <br />SAND AND GRAVEL <br />December 1, 1992 <br />Albert Frei arrd Sons, lnc. <br />Re: Weed Control Plan <br />~cRAL OFFICES ANO PLANT <br />11521 BRIGHTON ROAD . HENDERSON, COLORADO 80840 <br />17071788J718 <br />III IIIIIIIIIIIIIIII <br />7'lirough the assistance of Colorado State University <br />Cooperative Extension Agriculture program and American Pridei <br />fertilizer and Chemical Co. Albert Frei and Sons Fras <br />developed a plan to control noxious weed growtYr on our gravel <br />pits in the county. <br />A combination of weed species control n~etfrods such as <br />cultural, biological, mechanical, arrd chemical are <br />necessarily integrated to .maintain control of noxious weed <br />growth. Multiple methods will lead to reduced infestation of <br />Land altLrougfr total eradication is not a feasible goal. This <br />cun~es about because portions of each pit are reclaimed arrd <br />;:rny orre of the acceptable methods of control could be <br />detrimental to a reclaimed area. For example, herbicides <br />c::ould kill established grasses and trees if u~~ed <br />iridiscrinrinately or it would enter a lake and cause water <br />quality problems. <br />Cultural methods such as the introduction of competitive <br />grasses and trees will reduce the susceptibility of land 'to <br />t: tie growth of weeds. Competitive vegetation must be planted <br />arrd maintained in order to aid control. The introduction o'f <br />c,7rasses in not practical at present time because we must <br />first grade, slope and topsoil the land to support growth of <br />desirable vegetation. The grading, sloping, top soiling, and <br />revegetation will begin in~the Spring of 1993 and will <br />proceed for a period of approximately five years. Unce <br />seeding and revegetation takes place the soil will be <br />1:>rovided with nutrients to support the vegetation. The types <br />of desirable vegetation will be selected to suit tyre area arrd <br />.its environment. The types of vegetation are detailed in our <br />reclamation plans for each mine. <br />Mechranical methods such as mowing, uprooting, and <br />tilling are effective metFrods to control weed growth. For <br />e:rxarnple, mowing Leafy Spurge will interrupt tyre plants normal <br />growth cycle, thereby forcing tFre plant to flower at a <br />:;porter height. Mowing will also woaken tLre root system and <br />make it more susceptible to herbicides, Mowing Knapweeci at <br />t>ud stage and flower stage will lessen tyre spread of seed and <br />will allow herbicide use to be more effective. The <br />mechanical methods we employ will depend upon the terrain and <br />