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2012 Summary Report- Noxious Weed Management on <br />HOLCIM (US) Inc. Quarries in Larimer County -2012 <br />Holcim (US) Inc. <br />3500 Highway 120 <br />Florence, CO 81226 <br />Attn: Mike Toelle <br />Mike, <br />coc•i+ A of aw <br />Below is a summary of the 2012 spray season for HOLCIM (U.S) Inc. quarries in Larimer <br />County. This season proved to be a tough season to spray noxious weeds with the weather <br />patterns we experienced and the extreme drought. Our main target species continues to be <br />Leafy spurge (Euphorbia esula), and Canada thistle (Circium arvense), but have begun to notice <br />and increase in Houndstongue (Cynoglossum officinale) and Dalmatian toadflax (Linaria <br />dalmatica). Although significant progress has been made, and a large percentage of <br />infestations have been reduced, we are still experiencing new infestations popping up in areas <br />not seen in the past years and therefore scouting of the entire properties was mandatory to <br />assure proper coverage. <br />Our main focus, and where the greatest noxious weed problems occur, was the main <br />quarry, the Boettcher Limestone Quarry, and to some extent the Curtis Lake area. Based on our <br />past observations and applications of the Boettcher quarry, we are starting to see better control <br />in areas that were heavily infested with L. spurge and C.thistle on the east side of the property <br />from south to north, but are experiencing minimal re- growth of L.spurge and C.thistle from <br />adjacent properties, as well as new infestations including Houndstongue and D.toadflax. <br />Applications on Houndstongue and D. toadflax treatments were performed, and results varied <br />on the east side for D.toadflax, and the Houndstongue is still to be determined, but we <br />recommend continued monitoring in this area of the property to assure maximum control. The <br />more north on the east side of property you go, the cleaner the property looks, with minimal <br />patches of re- growth from existing infestations already treated, all the way up to the northern <br />boundary of the property near the large meadow. One area of concern on the east side that we <br />want to mention is the pits. Each pit with water in them on the east side of the property has <br />mixed results for control of L. spurge. These pits to date show only small signs of L.spurge <br />being found in them, but have caused issues in applications in the past due to the steepness of <br />the pits, and the unstable ground caused by loose rocks and debris. Treatments have been <br />