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Home My WebLink About14 - C - Arborist's Report Greenforest Incorporated C o n s u l t i n g A r b o r i s t 4547 South Lucile Street, Seattle, WA 98118 Tel. 206-‐723-‐0656 November 18, 2015 Alicia Pettibone RH2 Engineering, Inc. 22722 29th Drive SE, Suite 210 Bothell, WA 98021 RE: Tree Assessment and Arborist Report, Renton Highlands Reservoir Dear Ms. Pettibone: You contacted me and contracted my services as a consulting arborist. Proposed construction will add an additional water reservoir at the above referenced site. Several trees will be impacted and are proposed for removal. My assignment is to inspect and assess the significant impacted trees, and prepare a report to support a tree retention plan. You provided me a Tree Cutting, Land Clearing and Demolition Plan showing the locations of 99 impacted trees. I visited the site today and inspected these trees, which are the subject of this report. The site is relatively flat, and the majority of trees are located at the north end of the parcel, within two distinct groves, separated by lawn. The subject trees include 3 Pacific madrone, 2 western red-‐cedar and 94 Douglas-‐firs, ranging in diameter from 8 to 36 (DBH) inches. Nearly every tree is in good condition. TREE INSPECTION I visually inspected each tree from the ground and rated both tree health and structure. A tree’s structure is distinct from its health. This inspection identifies what is visible with both. Structure is the way the tree is put together or constructed, and identifying obvious defects can be helpful in determining if a tree is predisposed to failure. Health addresses disease and insect infestation. No invasive procedures were performed on any trees. The results of this inspection are based on what is visible at the time of the inspection. Alicia Pettibone, RH2 Engineering, Inc. RE: Tree Assessment and Arborist Report, Renton Highlands Reservoir November 18, 2015 Page 2 of 8 Greenforest Registered Consulting Arborist The attached inventory provides the following information about each tree: Tree number as indicated on the attached plan. DBH Stem diameter in inches measured 4.5 feet from the ground (DBH). Tree Species Common name. Tree Category Indicates if tree is Significant1, Landmark2 or Dangerous3 Dripline Average canopy extension (radius) in feet from the trunk. Health & Structure Rating ‘1’ indicates no visible health-‐related problems or structural defects; ‘2’ indicates minor visible problems or defects that may require attention or maintenance if the tree is retained, and/or the tree should only remain as a grove tree, and not stand alone; and ‘3’ indicates significant visible problems or defects and the tree is considered Dangerous by City code. Visible Defects Obvious structural defects or diseases visible at time of inspection, which includes: Asymmetric canopy– the tree has an asymmetric canopy from space and light competition from adjacent trees. Bow in trunk – a trunk lean characterized by the top of the tree leaning over. (Common with edge trees) Co-‐dominant leaders -‐ the tree has multiple stem attachments, which may lead to tree failure and require maintenance or monitoring over time. Diseased – foliage and trunk/stems are diseased. Double leader – the tree has multiple stem attachments, which may require maintenance or monitoring over time. Oozing resin -‐ is sometimes an indication of stress/decline. Thinning Canopy – low foliage density indicated infection/declining health. Suppressed -‐ Tree is suppressed by adjacent tree canopies. Trunk decay -‐ Wood decay is visible in the trunk. 1 Tree, Significant: A tree with a caliper of at least six inches (6"), or an alder or cottonwood tree with a caliper of at least eight inches (8"). 2 Tree, Landmark: A tree with a caliper of thirty inches (30") or greater. 3 Tree, Dangerous: Any tree that has been certified, in a written report, as dead, terminally diseased, damaged, or otherwise dangerous to persons or property by a certified arborist. Alicia Pettibone, RH2 Engineering, Inc. RE: Tree Assessment and Arborist Report, Renton Highlands Reservoir November 18, 2015 Page 3 of 8 Greenforest Registered Consulting Arborist The following table summarizes tree totals by tree species and tree category. Significant Landmark Dangerous Total Trees Douglas-‐fir 89 5 0 94 Madrone 2 0 1 3 Western red-‐cedar 1 0 1 2 99 Thank you very much for your business. Please let me know if you have any questions. Sincerely, GreenForest, Inc. By Favero Greenforest, M. S. ISA Certified Arborist # PN -‐0143A ASCA Registered Consulting Arborist® #379 ISA Tree Risk Assessment Qualified Attachments: 1. Assumptions & Limiting Conditions 2. Tree Inventory 3. Tree Cutting, Land Clearing and Demolition Plan Alicia Pettibone, RH2 Engineering, Inc. RE: Tree Assessment and Arborist Report, Renton Highlands Reservoir November 18, 2015 Page 4 of 8 Greenforest Registered Consulting Arborist Attachment No. 1 -‐ Assumptions & Limiting Conditions 1) A field examination of the site was made 11/18/2015. My observations and conclusions are as of that date. 2) Care has been taken to obtain all information from reliable sources. All data has been verified insofar as possible; however, the consultant/arborist can neither guarantee nor be responsible for the accuracy of information provided by others. 3) Unless stated other wise: 1) information contained in this report covers only those trees that were examined and reflects the condition of those trees at the time of inspection; and 2) the inspection is limited to visual examination of the subject trees without dissection, excavation, probing, or coring. There is no warranty or guarantee, expressed or implied that problems or deficiencies of the subject tree may not arise in the future. 4) The consultant/appraiser shall not be required to give testimony or to attend court by reason of this report unless subsequent contractual arrangements are made. 5) Loss or alteration of any part of this report invalidates the entire report. 6) Unless required by law otherwise, possession of this report or a copy thereof does not imply right of publication or use for any purpose by any other than the person to whom it is addressed, without the prior expressed written or verbal consent of the consultant/appraiser. 7) This report and any values/opinions expressed herein represent the opinion of the consultant/appraiser, and the consultant’s/appraiser’s fee is in no way contingent upon the reporting of a specified value, a stipulated result, the occurrence of a subsequent event, nor upon any finding to be reported. 8) Construction activities can impact trees in unpredictable ways. All retained trees should be inspected at the competition of construction, and regularly thereafter as part of ongoing maintenance. 9) All trees possess the risk of failure. Trees can fail at any time, with or without obvious defects, and with or without applied stress. Any treatments performed to abate current defects do not eliminate said defects, nor does it provide any guarantee against failure. Sometimes trees fail because they are trees. Alicia Pettibone, RH2 Engineering, Inc. RE: Tree Assessment and Arborist Report, Renton Highlands Reservoir November 18, 2015 Page 5 of 8 Greenforest Registered Consulting Arborist Attachment No. 2 – Tree Inventory Tree No. DBH Species Tree Category Dripline Health Structure Visible Defects 7604 26” Douglas-‐fir Significant 18' 1 1 8451 28” Douglas-‐fir Significant 18' 1 1 8505 24” Douglas-‐fir Significant 16' 1 2 Asymmetric canopy 8506 14” Douglas-‐fir Significant 16' 1 2 Asymmetric canopy 8507 26” Douglas-‐fir Significant 18' 1 2 Asymmetric canopy 8508 22” Douglas-‐fir Significant 16' 1 1 8509 8” Madrone Significant 6' 1 1 8510 18” Douglas-‐fir Significant 16' 1 2 Asymmetric canopy 9005 24” Douglas-‐fir Significant 16' 1 2 Asymmetric canopy 9006 12” Douglas-‐fir Significant 12' 1 2 Asymmetric canopy 9007 12” Douglas-‐fir Significant 12' 1 2 Asymmetric canopy 9008 12” Douglas-‐fir Significant 12' 1 2 Asymmetric canopy 9009 18” Douglas-‐fir Significant 16' 1 2 Asymmetric canopy 9010 12” Douglas-‐fir Significant 12' 1 2 Asymmetric canopy 9011 10” Douglas-‐fir Significant 12' 1 2 Asymmetric canopy 9012 14” Douglas-‐fir Significant 12' 1 2 Asymmetric canopy 9013 10” Douglas-‐fir Significant 12' 1 2 Asymmetric canopy 9014 16” Douglas-‐fir Significant 16' 1 2 Asymmetric canopy 9015 18” Douglas-‐fir Significant 16' 1 2 Asymmetric canopy 9016 16” Douglas-‐fir Significant 14' 1 2 Asymmetric canopy 9017 24” Douglas-‐fir Significant 16' 1 2 Asymmetric canopy 9120 24” Douglas-‐fir Significant 16' 1 2 Asymmetric canopy 9121 12” Douglas-‐fir Significant 14' 1 2 Asymmetric canopy 9122 16” Douglas-‐fir Significant 14' 1 2 Asymmetric canopy 9123 20” Douglas-‐fir Significant 16' 1 2 Asymmetric canopy 9124 18” Douglas-‐fir Significant 16' 1 2 Double leader, asymmetric canopy 9125 24” Douglas-‐fir Significant 16' 1 2 Asymmetric canopy 9126 14” Douglas-‐fir Significant 16' 1 2 Asymmetric canopy 9127 10” Douglas-‐fir Significant 12' 1 2 Asymmetric canopy 9128 20” Douglas-‐fir Significant 16' 1 2 Asymmetric canopy 9129 22” Douglas-‐fir Significant 16' 1 2 Asymmetric canopy 9130 12” Douglas-‐fir Significant 10' 1 2 Asymmetric canopy 9205 16” Douglas-‐fir Significant 14' 1 2 Asymmetric canopy 9206 22” Douglas-‐fir Significant 16' 1 2 Asymmetric canopy Alicia Pettibone, RH2 Engineering, Inc. RE: Tree Assessment and Arborist Report, Renton Highlands Reservoir November 18, 2015 Page 6 of 8 Greenforest Registered Consulting Arborist Tree No. DBH Species Tree Category Dripline Health Structure Visible Defects 9207 16” Douglas-‐fir Significant 16' 1 2 Asymmetric canopy 9208 20” Douglas-‐fir Significant 16' 1 2 Asymmetric canopy 9209 14” Douglas-‐fir Significant 12' 1 2 Asymmetric canopy 9210 20” Douglas-‐fir Significant 16' 1 2 Asymmetric canopy 9211 14” Douglas-‐fir Significant 12' 1 2 Asymmetric canopy 9212 22” Douglas-‐fir Significant 16' 1 2 Asymmetric canopy 9217 24” Douglas-‐fir Significant 18' 1 2 Asymmetric canopy 9218 16” Douglas-‐fir Significant 16' 1 2 Asymmetric canopy 9219 24” Douglas-‐fir Significant 18' 1 2 Asymmetric canopy 9220 18” Douglas-‐fir Significant 16' 1 2 Asymmetric canopy 9221 24” Douglas-‐fir Significant 16' 1 2 Asymmetric canopy 9222 10” Douglas-‐fir Significant 8' 1 2 Asymmetric canopy 9223 16” Douglas-‐fir Significant 16' 1 2 Asymmetric canopy 9224 16” Douglas-‐fir Significant 14' 1 2 Asymmetric canopy 9225 20” Douglas-‐fir Significant 16' 1 2 Asymmetric canopy 9226 14” Douglas-‐fir Significant 10' 1 2 Asymmetric canopy 9252 18” Douglas-‐fir Significant 14' 1 2 Asymmetric canopy 9253 24” Douglas-‐fir Significant 16' 2 2 Oozing resin, asymmetric canopy 9254 28” Douglas-‐fir Significant 16' 1 1 9255 24” Douglas-‐fir Significant 16' 1 1 9256 16” Western red-‐cedar Dangerous 8' 2 3 Trunk decay 9257 24” Douglas-‐fir Significant 16' 1 1 9258 22” Madrone Dangerous 16' 2 3 Bow in trunk, decay, diseased 9259 20” Madrone Significant 14' 2 1 Diseased 9260 30” Douglas-‐fir Landmark 18' 1 1 9261 14” Douglas-‐fir Significant 10' 1 2 Suppressed 9262 10” Douglas-‐fir Significant 12' 1 2 Suppressed 9263 16” Douglas-‐fir Significant 14' 1 1 9264 14” Douglas-‐fir Significant 12' 1 1 9265 24” Douglas-‐fir Significant 16' 1 1 9266 18” Douglas-‐fir Significant 14' 1 1 9267 16” Douglas-‐fir Significant 14' 1 1 9268 10” Douglas-‐fir Significant 12' 1 2 Defective rootcrown 9269 10” Douglas-‐fir Significant 10' 2 1 Suppressed 9270 16” Douglas-‐fir Significant 12' 1 2 Asymmetric canopy Alicia Pettibone, RH2 Engineering, Inc. RE: Tree Assessment and Arborist Report, Renton Highlands Reservoir November 18, 2015 Page 7 of 8 Greenforest Registered Consulting Arborist Tree No. DBH Species Tree Category Dripline Health Structure Visible Defects 9271 18” Douglas-‐fir Significant 16' 1 1 9272 22” Douglas-‐fir Significant 16' 1 1 9273 26” Douglas-‐fir Significant 18' 2 1 Oozing resin 9274 20”,24” Douglas-‐fir Significant 18' 1 2 Double leader 9276 34” Douglas-‐fir Landmark 18' 1 1 9277 26” Douglas-‐fir Significant 14' 1 2 Asymmetric canopy 9278 12” Douglas-‐fir Significant 12' 1 2 Suppressed 9279 26” Douglas-‐fir Significant 18' 2 1 Oozing resin 9280 28” Douglas-‐fir Significant 16' 1 1 9331 22” Douglas-‐fir Significant 16' 1 1 9332 24” Douglas-‐fir Significant 18' 1 2 Co-‐dominant leader 9333 26” Douglas-‐fir Significant 18' 2 1 Oozing resin 9334 24” Douglas-‐fir Significant 18' 1 1 9335 24” Douglas-‐fir Significant 18' 1 1 9336 20” Douglas-‐fir Significant 14' 2 1 Oozing resin 9340 36” Douglas-‐fir Landmark 18' 1 1 9341 26” Douglas-‐fir Significant 16' 1 1 9342 32” Douglas-‐fir Landmark 16' 2 1 Oozing resin 9343 14” Douglas-‐fir Significant 12' 2 1 Suppressed 9344 36” Douglas-‐fir Landmark 20' 1 1 9345 16” Western red-‐cedar Significant 10' 1 1 9346 28” Douglas-‐fir Significant 18' 2 1 Thin canopy 9347 16” Douglas-‐fir Significant 14' 2 1 Oozing resin 9348 10” Douglas-‐fir Significant 12' 2 2 Oozing resin, suppressed 9349 8” Douglas-‐fir Significant 10' 1 2 Suppressed 9350 10” Douglas-‐fir Significant 12' 1 2 Suppressed 9351 24” Douglas-‐fir Significant 16' 1 1 9352 20” Douglas-‐fir Significant 14' 1 1 9353 20” Douglas-‐fir Significant 16' 1 1 9354 28” Douglas-‐fir Significant 20' 1 1