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requires is a monthly inspection during the growing and quick action when something is found. If <br />done thoroughly enough, herbicides are often not even needed except for such species as Canada <br />Thistle and then only small applications. <br />Unfortunately, this site is well beyond the initial introduction stage, but not seriously so. <br />Concentrated effort for a couple of years could easily bring this site back to a low level of weed <br />infestation where normal maintenance can keep the weeds in check. <br />The first step is define a containment line around the site where weeds are controlled. <br />That line has been identified on the map and should be observed strictly. Initial control efforts <br />should concentrate on those populations that are near the containment lines which often, but not <br />always, follow the edge of the operation. Control near the edges helps prevent the species from <br />"jumping" the containment line into adjacent natural land. Populations of weeds that are more <br />internal to the site should also be attacked, but they are not of the highest priority in the initial <br />stages of the control plan. Furthermore, land beyond the containment line, especially disturbed <br />areas, should be frequently checked while control is being implemented along the perimeter of <br />the site and the containment line area. Initial efforts should attempt to eliminate weeds within <br />about 50 to 100 feet of the containment line. Then weed populations further from the <br />containment line can be attacked. If weeds are found outside the containment line those <br />populations immediately should be placed in the highest priority class. If that is not done then the <br />containment line may need to be expanded to include a much larger area which increases costs <br />some and the amount of work needed by several magnitudes. <br />Enclosed are data sheets for each of the species noted. Efforts to control weeds should <br />concentrate on the serious and most abundant species first. Do not attempt to control all weed <br />species at once as that is not only unnecessary, but time spent on uncommon species will take <br />away time available for attacking the most serious populations. Large populations indicate the <br />site is well suited for those species. Small populations most probably indicate either a species <br />that has just reached the site or, more likely, can only grow on the site in the most ideal habitats. <br />This is not to say the uncommon species should be ignored, but 95% of the effort should be spent <br />on the large populations of difficult to control species like knapweed, Canada Thistle, and, if still <br />present, leafy spurge. <br />The data sheets should be studied carefully and control recommendations in those sheets <br />followed closely. Do not deviate far from the recommended treatments or your time spent maybe <br />wasted. These recommended treatment approaches are key to success in your control efforts and <br />implementing the lowest cost control methods. If you need help, it is recommended you contact a <br />professional weed control person. Southwestern Ecological Services does weed surveys, maps, <br />and can define the dynamics of a weed infestation, but is not in the weed control business. <br />Legally that can only be implemented by landowners or licenced professionals. <br />RECEfVED <br />JUN 0 9 2003 <br />Division at Minerals and Geof <br />Snyder Quarry Weeds Survey Report - May 2003 R$'t'ge 3 <br />