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. <br /> Tim Edgeton <br /> Sherburne County Tree Board <br /> 26401 180th St. <br /> Big Lake, MN 55309 <br /> Gary Schmitz <br /> City of Elk River <br /> PO Box 490 <br /> 13065 Orono Parkway <br /> Elk River, MN 55330 <br /> Dear Gary, <br /> On Tuesday, September 20: we inspected a parcel of land <br /> owned by the city located just south of 193rd Ave. and east <br /> of Hwy. 169. Our primary objective was to identify tree <br /> species composition and determine the overall health of the <br /> trees. We also discussed tree removal for a drainage system <br /> and factors to consider when doing this. <br /> The overall health of the trees is very good. The stand <br /> consists of mostly oak with some understory trees including <br /> elm, ash, boxelder, maple, aspen, and cherry. The red oak <br /> are quite mature and compose most of the canopy. I would <br /> ��� estimate that about 60% of the trees are bur oak, 30% are <br /> red oak, and 10% of mixed tree species. There were a few <br /> small pockets of dead trees that have been dead for some <br /> time indicating the dieback was probably a result of <br /> drought/insect damage. The largest area with mortality was <br /> on the far west side of the wetland along the slope. This <br /> also had been dead for some time and looked more like <br /> drought and/or two-lined chestnut borer damage than anything <br /> else. Overall , the stand looked fairly healthy. There was no <br /> oak wilt observed on this property. There is a small oak <br /> wilt infection center just south of this wetland but not <br /> owned by the city. <br /> Regarding the drainage system, with any tree removal , <br /> there should be precautionary steps taken to prevent <br /> overland spread of oak wilt and construction damage. This <br /> includes using protective barrier fencing around "save" <br /> trees, covering any open wounds on oak from April 1 - July <br /> 15, and avoiding drastic grade changes near "save" trees. If <br /> I can be assistance during this process, please contact me <br /> at 263-8522. <br /> Sincerely, <br /> ��1 Tim Edgeton <br /> County Forest Resource Specialist <br /> Sherburne County Tree Board <br />