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-r I <br />PARTMENT OF N URAL RESOURCES <br />• arks & Visitor Services • Open Lands gram • Weed Management & Forestry <br />J 1800 South County Road 31 <br />Loveland, CO 80537 <br />(970 679-45701(970) 679-4574 FAX <br />larimer.org/naturalresources <br />? Vholcim (US) Inc. <br />3500 Highway 120 <br />Florence, CO 81226 <br />Attn: Mike Toelle ?j <br />duly 15, 2010 <br /> <br />Mike, <br />The Dilts Quarry and Boettcher Sandstone Quarry were surveyed July 2010 for weed infestations. No noxious <br />weeds were found at the Dilts Quarry, so no hours were invoiced for spray application at this site. The <br />Boettcher Sandstone Quarry was surveyed, substantial stands of Scotch thistle (Ohopordum acanthium) were <br />found and treated with Tordon (picloram) applied at .1 quartlacre. <br />The Boettcher Limestone Quarry was extensively surveyed, and weed infestations treated during the <br />spring/summer 2010. The primary noxious weed species present were leafy spurge (Euphorbia esula) and <br />Canada thistle (Circium arvense). Both species are more visible when in flower early in the season, and more <br />effective to treat at that time. Unfortunately, extensive infestations of leafy spurge were discovered on the <br />southwest portion of the quarry. The sites were treated with the most effective herbicides available, but such <br />dense, mature stands require subsequent herbicide application to be eliminated. I hope you will continue with <br />aggressive efforts to manage these weeds in the future. Neighbors in the area observed the county weed crew <br />working at the quarry and were very pleased that Holcim was taking action to manage noxious weeds. With <br />cooperation from landowners in this area, we hope the spread leafy spurge will soon be stopped and existed <br />infestations eliminated. <br />Tim D'Amato <br />Land Stewardship Manager <br />Larimer County Department of Natural Resources <br />PO Box 1190 <br />Ft. Collins, CO 80522 <br />970-498-5769 <br />tdamato@larimer.org