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Home My WebLink AboutC_Advisory Notes_Anne Thayer_20170824_v11 Alex Morganroth From:Anne Thayer Sent:Thursday, August 24, 2017 9:23 AM To:Alex Morganroth Cc:Terrence J. Flatley Subject:RE: Routine Vegetation Management Permit - 4108 NE 22nd Pl. Hi Alex, The following is a general statement regarding retaining trees for hardscape repairs, followed by some links. There are certainly more links available online. Once pavement is installed over a tree's roots, the tree loses some of its ability to get water and air, since most pavement is nonporous and will seal the roots away from the aeration and rainfall the tree needs. In addition, the tree roots are liable to push up the pavement as they grow, resulting in damage to driveway. The roots may also cause a tripping hazard as they push through the pavement. Once the tree becomes less healthy, it may blow over in a windstorm, or the tree may simply die from its inability to get water and air. If you can get by just cutting one or two roots, neatly cutting them with a hand saw helps them heal properly. It is recommended that buttress roots not be cut closer to the trunk than a distance equal to three times the trunk diameter (DBH). If they need to be severed closer than 1.5 times trunk diameter, tree removal should be considered since it is very likely that tree stability will be affected at this distance, depending on tree species and condition. When reinstalling the pavement next to a root cut tree, allow space for callus and trunk diameter growth. Installation of a root barrier or root excluding base (foam board or washed gravel) should also be considered under the new pavement to avoid reoccurrence of the problem.. Cutting multiple roots of the tree is not an option, since the health of the tree will likely decline and the tree may become structurally unstable. Pavers offer a beautiful option in place of concrete or tar paving since they do not show cracks from roots invading the pavement. Pavers allow water and nutrients to reach the roots. If the roots continue to grow, it's easy to lift the pavers and regrade the area. Another option includes the use of permeable paving, also known as permeable concrete. Permeable paving offers an effective way to allow water and air to seep into the ground around the roots of your tree. Another advantage to permeable paving includes its ability to collect rainwater while reducing stormwater runoff and erosion. Replacing concrete with interlocking paver blocks or rubber pavers. This alternative will not slow pavement lifting, but will allow for a smoother transition and the removal of blocks that have lifted too high. Pavers are installed by removing the concrete and base materials above the roots and removing the soil between the roots if needed using a supersonic air excavation tool, installing a new sub-base of coarse sand or pea gravel, leveling and compacting the sub-base slightly above the existing roots, install a geotextile fabric (e.g. Typar 3341) on top of the base, then installing and compacting a coarse sand base layer, and finally installing the pavers. Paver joints should not be mortared. Here are a few links to alternatives for hardscape repair around tree roots: Rubber is an alternative product to concrete or asphalt. http://hort.ifas.ufl.edu/woody/rubber.shtml www.rubbersidewalks.com/ Porous pavement allows air and nutrients to get to the tree roots Use of Geotextile products http://www.typargeotextiles.com/paved.html 2 Polymer as a repair for areas in driveway http://www.pavement-repair-products.com/fastpatch-dpr-asphalt-repair-c-34.html Using reinforcements in concrete reduces heaving from roots and weather related heaving http://hort.ifas.ufl.edu/woody/reinforced-concrete.shtml Expansion joints and ramping over roots https://www.portlandoregon.gov/transportation/article/443054 This is a must have for maintaining our Urban Forest: Tree Protection on Construction & Development Sites (OSU) http://ir.library.oregonstate.edu/xmlui/bitstream/handle/1957/13729/EM8994.pdf?sequence=5 Please feel free to contact me if I can be of further assistance at 425-430-6698. Anne Thayer Contract Arborist Inspector Davey Resource Group for City of Renton From: Alex Morganroth Sent: Wednesday, August 23, 2017 4:22 PM To: Anne Thayer Subject: RE: Routine Vegetation Management Permit - 4108 NE 22nd Pl. Great, thanks Anne! Alex Alex Morganroth, Associate Planner City of Renton | CED | Planning Division 1055 S Grady Way | 6th Floor | Renton, WA 98057 (425) 430-7219 | amorganroth@rentonwa.gov From: Anne Thayer Sent: Wednesday, August 23, 2017 4:17 PM To: Alex Morganroth <AMorganroth@Rentonwa.gov> Subject: RE: Routine Vegetation Management Permit - 4108 NE 22nd Pl. Alex, I will get a list together for you first thing tomorrow morning. Regards, Anne Thayer Contract Arborist Inspector Davey Resource Group for City of Renton 3 From: Alex Morganroth Sent: Wednesday, August 23, 2017 3:33 PM To: Anne Thayer Subject: RE: Routine Vegetation Management Permit - 4108 NE 22nd Pl. Hi Anne, I spoke with the owner of 4108 NE 22nd Pl and he understood our position that there are reasonable alternatives to cutting down the trees in order to mitigate the damage caused to the neighbor’s driveway. In order to make sure we have a complete record, would be able to send me via email your comments on alternatives (root grinding, flexible pavement, etc) that we discussed earlier? Thanks! Alex Alex Morganroth, Associate Planner City of Renton | CED | Planning Division 1055 S Grady Way | 6th Floor | Renton, WA 98057 (425) 430-7219 | amorganroth@rentonwa.gov From: Anne Thayer Sent: Wednesday, August 23, 2017 1:48 PM To: Alex Morganroth <AMorganroth@Rentonwa.gov> Cc: Angelea Weihs <AWeihs@Rentonwa.gov>; Terrence J. Flatley <Tflatley@Rentonwa.gov> Subject: RE: Routine Vegetation Management Permit - 4108 NE 22nd Pl. Hi Alex, I believe I copied Angelea in the email to Joshua Kang. I will attach the response form, map and photos for the two landmark trees. They are in good condition, just heaving the adjacent property driveway a bit. Regards, Anne Thayer Contract Arborist Inspector Davey Resource Group for City of Renton From: Alex Morganroth Sent: Wednesday, August 23, 2017 1:34 PM To: Anne Thayer Subject: FW: Routine Vegetation Management Permit - 4108 NE 22nd Pl. Hi Anne, Joshua Kang will be applying for a Routine Vegetation Management Permit to remove two landmark trees on his property at 4108 NE 22nd Pl. In his email, he stated that you will be providing reports for these trees. Are you able to send me those if they are completed? Thanks! 4 Alex Morganroth, Associate Planner City of Renton | CED | Planning Division 1055 S Grady Way | 6th Floor | Renton, WA 98057 (425) 430-7219 | amorganroth@rentonwa.gov From: Josh K [mailto:jsk31380@hotmail.com] Sent: Wednesday, August 16, 2017 4:47 PM To: Alex Morganroth <AMorganroth@Rentonwa.gov> Cc: jkang@ncua.gov Subject: Fw: Routine Vegetation Management Permit - 4108 NE 22nd Pl. Hi Alex, Per Angelea's email below, I am contacting you to set up an appointment in order to submit a Routine Vegetation Management Permit application sometime the week of 8/21 - preferably either 8/22 (Tuesday) or 8/23 (Wednesday) at your convenience. If either date does not work for you, please suggest a couple of dates and time slots with your availability. Please email me at jsk31380@hotmail.com or jkang@ncua.gov. Or if preferred, I can be reached at (571) 423 - 6927. As noted below, Ms. Anne Thayer has inspected the two landmark trees this past Monday, 8/14. She had indicated that her reports will be provided to the City of Renton within a week. Thank you so much, and I look forward to hearing from you. Joshua Kang (571) 423 - 6927 From: Angelea Weihs <AWeihs@Rentonwa.gov> Sent: Wednesday, August 16, 2017 3:17 PM To: 'Josh K' Subject: RE: Routine Vegetation Management Permit - 4108 NE 22nd Pl. Hello Joshua, I only just received this email today at 2 pm, and therefore could not schedule anything for yesterday. This project will be reassigned to Alex Morganroth (amorganroth@rentonwa.gov). You can contact him to schedule an appointment. Have a great day! Angelea Weihs Associate Planner, City of Renton 1055 S. Grady Way Renton, WA 98057 5 (425) 430-7312 From: Josh K [mailto:jsk31380@hotmail.com] Sent: Wednesday, August 16, 2017 2:01 PM To: Angelea Weihs <AWeihs@Rentonwa.gov> Cc: jkang@ncua.gov Subject: Routine Vegetation Management Permit - 4108 NE 22nd Pl. Ms. Weihs: My name is Joshua Kang, a resident of Renton, WA. I had the pleasure of meeting you about a month ago in your office discussing the Routine Vegetation Management Permit application process. I am ready to submit a Routine Vegetation Management Permit application and would like set up an appointment with you sometime next week – preferably Tuesday (8/15), or Wednesday (8/16), at your convenience. If either of these dates does not work for you, please let me know which dates you are available. Ms. Anne Thayer from Davey Resource Group for the City of Renton came out and inspected the two landmarks trees that were damaging my neighbor’s drive-way this past Monday, 8/14. Ms. Thayer stated that her written report would be completed and provided to the City of Renton within a week. Please email me at jsk31380@hotmail.com or jkang@ncua.gov, or call me at (571) 423 – 6927 regarding your availability. I look forward to hearing from you. Sincerely, Joshua Kang