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HomeMy WebLinkAboutArbor_114th_Final16204 114th AVE SE, Renton, WA 1of8 Steep Slope Tree Consulting, LLC 2/26/2015 Amended 12/22/16 Amended 4/17/17 John Kenney ISA Certified Arborist/ Municipal Specialist # PN-6601AM ISA Qualified Tree Risk Assessor #510 Certificate in Stream Restoration Certificate in Project Management (206) 547-1177 john.kenney123@gmail.com To: Todd Karam Limelight Development, LLC Job Site: 16204 114th AVE SE, Renton, WA Date: 2/26/2015 Amended 12/22/16 Amended 4/17/17 Prepared By: John Kenney, Owner, Steep Slope Tree Consulting ISA Certified Arborist/ Municipal Specialist # PN-6601AM ISA Qualified Tree Risk Assessor #510 Amended 4/17/17 I received the following email from Mona Davis 4/6/17. I have again amended the original report. “Hi John…I required an arborist report on the above-referenced development that addressed potential impacts of construction along the base of the trees on SE 162nd St. There are currently 8 trees that are very close to the property line, with the dripline extending into the area of construction. I see that you've addressed “building pads” for the house construction, but not the sidewalk, shared driveway and utility installation occurring within the driplines of the retained trees. Could you please expand upon this? I need to know if these trees will be viable after construction…and any recommendations you may have to assure that these trees can withstand the construction impacts proposed.” Response 16204 114th AVE SE, Renton, WA 2of8 Steep Slope Tree Consulting, LLC 2/26/2015 Amended 12/22/16 Amended 4/17/17 Discussion I discussed this conflict with the new sidewalk and trees 4-10, with the Civil Engineer Max Berde with Coterra today 4/17/17. He directed me to page C15 dated 3/29/17. This detail shows some of the layering for the pervious sidewalk. We discussed having to install utilities in the existing ditch along the road used now for drainage. Then filling and compacting the area within 4' of the trunks of these trees. While we discussed this we did not reasonably conclude digging below grade. The plans do note 2” of compaction within trees critical root zone. This situation seems like a compaction over roots instead of cutting or removing roots. This species is tolerant of root compaction and most structural roots should be on the previously undisturbed south side. Recommendations for sidewalk installation near trees 4-10 1.The 2” compaction of subgrade be done for all areas under tree canopy of trees 4-10. 2.Have Certified Arborist on site during initial excavation for utilities under these tree canopys. Have Arborist document and make recommendations. And or have them send these findings to the city and I. We should know then if structural roots have grown into the ditch. 3.If no significant structural roots are disturbed during utilities excavation. Have Certified Arborist on site during any sidewalk excavation that goes below original grade within these trees 4-10 driplines. Amended 12/22/16 I was asked to respond to the following correction, that was not provided in formal city form. I had preformed a tree inventory about a year ago. 3. “The applicant shall provide a report prepared by a qualified arborist that evaluates and determines whether or not trees identified to be retained can be retained throughout construction and not impact the health of the tree”. I have amended this initial tree inventory with my response to this question. I have reviewed the civil plans page C4 dated 12/8/15 and have the following comments. 1.Tree #1, tunnel/bore or air excavation with Arborist supervision. 2.Trees #2 and #11 are proposed to be removed. Please see my numbering below on the survey. 3. Note on pruning trees #4-10 prior to demolition for clearance during construction. These tree branches should be shortened for clearance and not limbed up. 4.The building pads are far enough away from trees 4-11 are sufficient. However these building conditions could change at time of house construction. Those house building plans will have to be reviewed individually. As long as construction is outside the below listed driplines the trees should survive. If any of these driplines be encroached on limits of disturbance will have to be determined by a TRAQ Qualified Arborist. In my opinion following these listed items will make the trees likely to survive and thrive after this phase of construction. It will also make it clear to the builder and contractors that these trees need to be save and protected. Table of Contents 16204 114th AVE SE, Renton, WA 3of8 Steep Slope Tree Consulting, LLC 2/26/2015 Amended 12/22/16 Amended 4/17/17 Summary Assignment & Scope of Report Methods Observations Discussion Recommendations Glossary Assumptions and Limiting Conditions Summary I was asked to produce an “Arborist Report” report before proposed development. Assignment & Scope of Report This report outlines the site inspections by John A. Kenney, of Steep Slope Tree Consulting, LLC. Methods What I did do I documented the diameter and species of each significant tree on site or close border tree. For the species column, the first two letters of the genus and species are combined to make a code. Tree Tags If enough trees are on site to cause confusion I used a aluminum tag and stapled it into the tree with an etched number. I then documented the diameter with a tape. And the species of each significant tree on site or close border tree. Previous tree measurements and ID from the surveyor were ignored, locations were used. I measured the drip lines of all trees. All tree diameter measurement in inches. Tree Evaluation I used the Visual Tree Assessment strategy taught by the International Society of Arboriculture. This includes the categories that follow. 1.Target Assessment 2.Site factors 3.Tree Health and Species Profile 4.Load factors 5.Tree defects and conditions affecting the likelihood of failure Observations 16204 114th AVE SE, Renton, WA 4of8 Steep Slope Tree Consulting, LLC 2/26/2015 Amended 12/22/16 Amended 4/17/17 Tree Numbers and Locations 16204 114th AVE SE, Renton, WA 5of8 Steep Slope Tree Consulting, LLC 2/26/2015 Amended 12/22/16 Amended 4/17/17 Tree #1 horse chestnut, Aesculus hippocastanum, AEHI, this tree has a vertical crack on the east face. It looks to have healed. But the species has brittle wood and is prone to breakage. Pruning to reduce weight on this side could reduce risk. Tree#2 Possible girdling at the base, and insect borer on a limited basis, 3 or 4 holes found. Trees #3-11 are all groove trees and may be susceptible to windthrow if any tree were to be left alone. Trees 3-7 could be broken into one grove and 8-11 another. This is because a tree between 7 and 8 was removed at least 10 years ago. This allowed both trees 7 and 8 to grow some longer branches in the direction of the removed tree and grow roots to resist this new wind loading. Tree #3 was topped at 20' and may have some weak attachments that could be cabled together. Tree #4 Flat base of trunk on east side. Could be an indication of decay. This tree is also suppressed by the other trees. Not a good candidate to be saved on its own. Tree #5 Suppressed. Not a good candidate to be saved on its own. Tree#6 Flat base at east west side of trunk. Could indicate decay or defect. Tree#7 ivy base to 20' up, blocking visual inspection. Possible weak attachment in top of crown. Ivy could be removed or cut at base. Top could be cabled. Tree#8 Ivy base to 20' up, blocking visual inspection. Ivy could be removed or cut at base. Tree#9 Suppressed. Tree#11 Ivy base to 20' up, blocking visual inspection. Ivy could be removed or cut at base. 16204 114th AVE SE, Renton, WA 6of8 Steep Slope Tree Consulting, LLC 2/26/2015 Amended 12/22/16 Amended 4/17/17 Tree #Species (federal code) Size inches Current health rating (good, fair, bad) Drip line radius North Drip line South Drip line East Drip Line West 1 AEHI 23.5 good 17 20 20 18 2 AEHI 18.5 good 16 13 15 18 3 PSME 26.5 good 18 25 15 18 4 PSME 20 good 18 18 15 15 5 PSME 22.8 good 18 23 15 15 6 PSME 29 good 18 24.6 15 15 7 PSME 24.5 good 18 25 15 15 8 PSME 18 good 18 15 15 15 9 PSME 21.8 good 18 20 15 15 10 PSME 30.5 good 18 25 15 15 11 PSME 24.9 good 18 31 25 15 Douglas fir, Pseudotsuga menziesii, PSME horse chestnut, Aesculus hippocastanum, AEHI Glossary DBH: diameter at breast height: the diameter of the trunk measured at 54 inches above grade. John Kenney Owner Steep Slope Tree Consulting ISA Certified Arborist/ Municipal Specialist # PN-6601AM ISA Qualified Tree Risk Assessor #510 16204 114th AVE SE, Renton, WA 7of8 Steep Slope Tree Consulting, LLC 2/26/2015 Amended 12/22/16 Amended 4/17/17 Certificate in Stream Restoration Certificate in Project Management (206) 547-1177 john.kenney123@gmail.com Assumptions and Limiting Conditions 1.A Field examination of the site was made 2/20/2015. My observations and conclusions are as of that date. 2. Any legal description provided to the consultant is assumed to be correct. It is assumed that this property is not in violation of any codes, statutes, ordinances, or other governmental regulations. No responsibility is assumed for legal matters. 3. Care has been taken to obtain all information from reliable sources. However, the consultant can neither guarantee nor be responsible for the accuracy of information provided by others. 4. The consultant shall not be required to give testimony or attend court by reason of this report unless subsequent contractual arrangements are made, including additional fees. 5.This report and any values expressed herein represent the opinion of the consultant, and the consultant 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. 6.All trees possess the risk of failure. Trees can fail at any time, with or without obvious defects, and with or without applied stress. 7.Drawings and information contained in this report may not be to scale and are intended to be used as points of reference only. The reproduction of information generated by other consultants is for coordination and ease of reference. Inclusion of such information does not constitute a representation by the consulting arborist, as to the sufficiency or accuracy of the information. 8.Unless expressed otherwise, information in this report covers only items that were examined, and reflects the condition of those items at the time of inspection. The inspection is limited to visual examination of accessible items without laboratory analysis, dissection, excavation, probing, or coring, unless otherwise stated. 9.There is no warranty or guarantee, expressed or implied, that problems or deficiencies of the 16204 114th AVE SE, Renton, WA 8of8 Steep Slope Tree Consulting, LLC 2/26/2015 Amended 12/22/16 Amended 4/17/17 plants or property in question may not arise in the future. 10.The consultant’s role is only to make recommendations; actions or inaction’s on the part of the client are not the responsibility of the consultant. 11.Loss or alteration of any part of this report invalidates the entire report. 12.There is no warranty suggested for any of the trees subject to this report. Weather, latent tree conditions, and future man-caused activities could cause physiologic changes and deteriorating tree condition. Over time,deteriorating tree conditions may appear and there may be conditions, which are not now visible which, could cause tree failure. This report or the verbal comments made at the site in no way warrant the structural stability or long term condition of any tree, but represent my opinion based on the observations made. Nearly all trees in any condition standing within reach of improvements or human use areas represent hazards that could lead to damage or injury.