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M E M 0 RA N D U M City of Roseville Forestry Program <br /> Date; July 29, 1998 <br /> To: Bob Bierscheid <br /> Park and Recreation Director <br /> From Anita Twaroski <br /> Forestry Technician <br /> 490-231 <br /> Re: APPEAL OF REQUEST FOR REMOVAL OF HAZARDOUS SILVER <br /> MAPLE BY GARY RUUD <br /> In response to an appeal letter submitted to you by Gary Ruud, in which he <br /> requests an extension of time to remove a hazardous silver maple tree on his <br /> propel} the tree remains a hazard and needs to be removed as soon as <br /> possible. <br /> It is my professional opinion that the tree is a hazard. A hazardous tree' is <br /> defined as a defective tree plus a target. It is my opinion that this tree is <br /> defective/hazardous based on the following criteria: <br /> 1. The species itself, Silver maple, is known to sustain consistent and <br /> common defects considered hazardous <br /> • whenever the tree groves greater than 15" DBH they are more <br /> suspect and will be susceptible to branch breakage. <br /> • because the good also tends to fracture causing branch breakage <br /> during storms. <br /> 2. As with other maples, silver maples tend to have creak unions, <br /> involving included barb, distinguished by V-shaped unions. <br /> 3. A weak branch union is structurally unsound because bark layers are <br /> ingrown. Bark has no power to hold the branches together, resulting in <br /> a weak union, where the branch breaks off or the tree splits open. <br /> 4. There is high failure potential when a weak union is also cracked, <br /> ca n kered or decayed. The tree shoves signs of decay where the <br /> branches have failed. <br /> z The definitions and criteria listed above is taken frorn a manual entitled}How To Detect.Assess and <br /> Correct Hard Trees in Recreational Areas. The i irmesota Departmew of Natural Rewurces distributes <br /> this manual. <br />