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Home My WebLink AboutEx07_Tree_ReportTree Report Page 1 of 6 King County South Treatment Plant Tree Report King County South Treatment Plant Biogas and Heat Systems Improvements February 15, 2018 Prepared by: Mary Ellen Russell Landscape Architect, Washington no. 1149, 2009 Tree Risk Assessment Qualification, International Society of Arboriculture, 2015 On November 15, 2017, I completed a level 1 (planning level) tree risk assessment for 180 existing trees at the King County South Treatment Plant near impacts associated with proposed Biogas and Heat System Improvements. This report details the results of those tree assessments. This report is written in accordance with the requirements of Renton Municipal Code section 4‐4‐130, Tree Retention and Land Clearing Regulations. Locations of assessed trees are shown on the Landscape and Tree Retention Plan. A summary and details of the assessment are shown in the table below. Of the 180 assessed trees, 42 trees with a Diameter at Breast Height (DBH) greater than 6” are proposed for removal. 39 trees will be removed due to impacts of construction, 3 trees will be removed due to the poor condition of the trees which makes their location near construction and proposed facilities high risk. All trees proposed to be retained will be protected with high visibility Tree Protection Fencing as shown on the Landscape and Tree Retention Plans. Wherever possible, tree protection fencing shall be located 10’ from the base of the trunk or at the dripline, whichever is greater, to protect the critical root zone. For trees to remain, no impacts shall be located closer than 5’ to be base of the trunk or in more than 25% of the critical root zone. This project proposes to retain all trees for which the impacts of development will be minimal or none. The tree retention priorities specified in RMC 4‐4‐130H.1.b have been considered as part of this report. The assessed trees in this report do not include any Landmark (priority one) trees. The trees to be retained consist of 138 priority two trees. The existing assessed trees were planted as part of previous development projects with sufficient space between them to allow development of even canopies. The proposed tree removals will likely not impact the health or durability of existing trees to remain. The project proposes to retain 76% of the existing significant trees on site. This is well above the minimum required threshold of 10% per RMC 4‐4‐ 130H. No replacement trees are required. 7901 Woodlawn Ave NE, Ste 202 Seattle, WA 98115 206.898.6312 maryellen@russell‐lambert.com FOR REFERENCE ONLY: While this report was prepared for another project proposed at the South Treatment Plant site, it was used in completing the Tree Retention Worksheet to show the context and number of trees on the treatment plant campus. EXHIBIT 7 RECEIVED Clark Close 04/19/2021 PLANNING DIVISION DocuSign Envelope ID: 6CE3899A-1D0A-43F4-A678-6B93041EB30C Tree Report Page 2 of 6 King County South Treatment Plant Tree Assessment Summary Table Tree No. Scientific Name Common Name Size Condition Condition Notes Significant/ Landmark/ Dangerous Remove/ Retain Reason for Removal: 145 Fraxinus sp. Ash 12" 1 S Retain 146 Fraxinus sp. Ash 6" 1 S Retain 147 Pyrus calleryana Callery Pear 8" 3 Dead branches, lean D* Retain 150 Pinus nigra Black Pine 8" 1 S Retain 152 Fraxinus sp. Ash 8" 2 Broken limb S Retain 153 Pyrus calleryana Callery Pear 13" 2 Stunted S Retain 154 Pyrus calleryana Callery Pear 8" 1 S Retain 156 Pyrus calleryana Callery Pear 10" 1 S Retain 157 Calocedrus decurrens Incense Cedar 12' 1 S Retain 158 Calocedrus decurrens Incense Cedar 12" 1 S Retain 159 Calocedrus decurrens Incense Cedar 12" 1 S Retain 160 Calocedrus decurrens Incense Cedar 14" 1 S Retain 163 Pinus nigra Black Pine 8" 1 S Retain 164 Pinus nigra Black Pine 8" 1 S Retain 167 Pinus nigra Black Pine 8" 1 S Retain 168 Pinus nigra Black Pine 10" 1 S Retain 171 Pinus nigra Black Pine 6" 1 S Retain 173 Pinus nigra Black Pine 9" 2 Lean, corrected S Retain 174 Pinus nigra Black Pine 9" 1 S Retain 177 Fraxinus sp. Ash 7" 1 S Retain 179 Pinus nigra Black Pine 8" 1 S Retain 180 Pinus nigra Black Pine 9" 2 Thin canopy S Retain 181 Pinus nigra Black Pine 8" 2 Thin canopy S Retain 182 Pinus nigra Black Pine 10" 2 Thin canopy S Retain 183 Pinus nigra Black Pine 13" 2 Thin canopy S Retain 184 Pinus nigra Black Pine 8" 2 Thin canopy S Retain 185 Pyrus calleryana Callery Pear 6" 1 S Retain 187 Pinus nigra Black Pine 8" 1 S Retain 188 Liquidambar styraciflua Sweet Gum 6" 2 Dead branches S Retain 189 Pinus nigra Black Pine 12" 1 S Retain 190 Liquidambar styraciflua Sweet Gum 6" 1 S Retain 192 Pinus nigra Black Pine 7" 1 S Retain 194 Pinus nigra Black Pine 10" 1 S Retain 195 Pinus nigra Black Pine 7" 1 S Retain 196 Fraxinus sp. Ash 6" 1 S Retain 346 Malus sp. Crabapple 7" 3 Lean, stunted growth D Retain 349 Malus sp. Crabapple 8" 3 Severely stunted D Remove Condition 366 Calocedrus decurrens Incense Cedar 13" 1 S Retain 393 Pinus nigra Black Pine 12" 1 S Retain 406 Malus sp. Crabapple 8" 2 Response growth S Retain 408 Malus sp. Crabapple 6" 2 Response growth S Retain DocuSign Envelope ID: 6CE3899A-1D0A-43F4-A678-6B93041EB30C Tree Report Page 3 of 6 King County South Treatment Plant Tree No. Scientific Name Common Name Size Condition Condition Notes Significant/ Landmark/ Dangerous Remove/ Retain Reason for Removal: 412 Fraxinus sp. Ash 6" 1 S Retain 413 Fraxinus sp. Ash 6" 1 S Retain 415 Liquidambar styraciflua Sweet Gum 8" 1 S Remove Impacts 416 Fraxinus sp. Ash 13" 1 S Remove Impacts 419 Fraxinus sp. Ash 9" 1 S Retain 500 Populus nigra Cottonwood 10" 1 S Remove Impacts 501 Populus nigra Cottonwood 8" 1 S Remove Impacts 503 Pseudotsuga menziesii Douglas Fir 9" 1 S Remove Impacts 504 Fraxinus sp. Ash 7" 2 Broken branches S Retain 505 Pseudotsuga menziesii Douglas Fir 6" 1 S Retain 506 Pseudotsuga menziesii Douglas Fir 9" 1 S Retain 507 Pseudotsuga menziesii Douglas Fir 9" 1 S Retain 508 Pseudotsuga menziesii Douglas Fir 9" 1 S Remove Impacts 509 Pseudotsuga menziesii Douglas Fir 9" 1 S Remove Impacts 510 Pseudotsuga menziesii Douglas Fir 9" 1 S Remove Impacts 524 Pinus nigra Black Pine 8" 1 S Retain 525 Pinus nigra Black Pine 9" 2 Stunted S Retain 1405 Pseudotsuga menziesii Douglas Fir 7" 1 S Retain 1443 Picea abies Norway Spruce 16" 1 S Remove Impacts 1444 Picea abies Norway Spruce 11" 1 S Remove Impacts 1445 Picea abies Norway Spruce 16" 1 S Remove Impacts 1446 Picea abies Norway Spruce 14" 1 S Remove Impacts 1450 Picea abies Norway Spruce 10" 1 S Remove Impacts 1451 Picea abies Norway Spruce 8" 1 S Remove Impacts 1452 Picea abies Norway Spruce 17" 1 S Remove Impacts 1453 Pseudotsuga menziesii Douglas Fir 6" 1 S Remove Impacts 1455 Pseudotsuga menziesii Douglas Fir 7" 1 S Remove Impacts 1456 Picea abies Norway Spruce 8" 1 S Remove Impacts 1636 Malus sp. Crabapple 11" 2 Pruned limbs, response growth S Remove Impacts 1637 Malus sp. Crabapple 10" 2 Pruned limbs, response growth S Remove Impacts 1638 Malus sp. Crabapple 10" 2 Pruned limbs, response growth S Remove Impacts 1639 Malus sp. Crabapple 8" 2 Pruned limbs, response growth S Remove Impacts 1640 Malus sp. Crabapple 7" 2 Pruned limbs, response growth S Remove Impacts 1641 Malus sp. Crabapple 7" 2 Pruned limbs, response growth S Remove Impacts 1830 Prunus laurocerasus Laurel 13" 2 Pruned to shrub form S Retain 1831 Pinus nigra Pinus nigra 12" 1 S Retain 1832 Pinus nigra Pinus nigra 13" 1 S Retain 1862 Prunus laurocerasus Laurel 13" 2 Pruned to shrub form S Remove Impacts 1863 Prunus laurocerasus Laurel 14" 2 Pruned to shrub form S Retain 2038 Pinus nigra Pinus nigra 14" 1 S Retain DocuSign Envelope ID: 6CE3899A-1D0A-43F4-A678-6B93041EB30C Tree Report Page 4 of 6 King County South Treatment Plant Tree No. Scientific Name Common Name Size Condition Condition Notes Significant/ Landmark/ Dangerous Remove/ Retain Reason for Removal: 2039 Mystery Mystery 12" 1 S Retain 4230 Calocedrus decurrens Incense Cedar 7" 1 S Retain 4231 Fraxinus sp. Ash 6" 1 S Retain 4242 Fraxinus sp. Ash 7" 2 Response growth at base S Retain 4282 Fraxinus sp. Ash 7" 1 S Retain 4288 Pseudotsuga menziesii Douglas Fir 12" 1 S Retain 4295 Fraxinus sp. Ash 6" 1 S Retain 4296 Fraxinus sp. Ash 7" 1 S Retain 4297 Pseudotsuga menziesii Douglas Fir 12" 1 S Retain 4298 Pseudotsuga menziesii Douglas Fir 12" 1 S Remove 4388 Fraxinus sp. Ash 6" 1 S Retain 4389 Larix sp. Larch 6" 4 dead limbs, large cracks D Remove 4399 Larix sp. Larch 6" 4 dead limbs, large cracks D* Retain 4400 Pseudotsuga menziesii Douglas Fir 12" 1 S Remove 4401 Larix sp. Larch 6" 4 Mostly dead D* Retain 4409 Cretaegus x lavalleei Hawthorn 6" 2 Shrubby w/ root sprouts S Retain 4410 Cretaegus x lavalleei Hawthorn 6" 2 Shrubby w/ root sprouts S Retain 4411 Pseudotsuga menziesii Douglas Fir 11" 1 S Retain 4412 Pseudotsuga menziesii Douglas Fir 11" 1 S Retain 4413 Pseudotsuga menziesii Douglas Fir 12" 1 S Retain 4414 Pseudotsuga menziesii Douglas Fir 12" 1 S Retain 4415 Pseudotsuga menziesii Douglas Fir 12" 1 S Retain 4416 Pseudotsuga menziesii Douglas Fir 13" 1 S Retain 4417 Pseudotsuga menziesii Douglas Fir 13" 1 S Retain 4418 Pseudotsuga menziesii Douglas Fir 14" 1 S Retain 4419 Fraxinus sp. Ash 6" 2 Response growth at base S Retain 4420 Fraxinus sp. Ash 6" 1 S Retain 4632 Fraxinus sp. Ash 8" 1 S Retain 4633 Fraxinus sp. Ash 7" 1 S Retain 4635 Calocedrus decurrens Incense Cedar 8" 1 S Retain 4636 Calocedrus decurrens Incense Cedar 6" 1 S Retain 4637 Calocedrus decurrens Incense Cedar 10" 1 S Retain 4638 Fraxinus sp. Ash 11" 1 S Retain 4639 Pseudotsuga menziesii Douglas Fir 10" 1 S Retain 4857 Fraxinus sp. Ash 6" 2 Damage at base of trunk S Retain 4858 Fraxinus sp. Ash 7" 1 S Retain 4859 Fraxinus sp. Ash 6" 2 Damage at base of trunk S Retain 4860 Pseudotsuga menziesii Douglas Fir 7" 1 S Retain 4861 Pseudotsuga menziesii Douglas Fir 10" 1 S Retain 4862 Pseudotsuga menziesii Douglas Fir 10" 2 Missing leader S Remove 4863 Pseudotsuga menziesii Douglas Fir 11" 1 S Remove 4864 Pseudotsuga menziesii Douglas Fir 11" 1 S Remove 4893 Fraxinus sp. Ash 6" 1 S Retain 4894 Fraxinus sp. Ash 7" 1 S Remove DocuSign Envelope ID: 6CE3899A-1D0A-43F4-A678-6B93041EB30C Tree Report Page 5 of 6 King County South Treatment Plant Tree No. Scientific Name Common Name Size Condition Condition Notes Significant/ Landmark/ Dangerous Remove/ Retain Reason for Removal: 4897 Pseudotsuga menziesii Douglas Fir 11" 1 S Remove 4899 Pseudotsuga menziesii Douglas Fir 10" 1 S Remove 4900 Pseudotsuga menziesii Douglas Fir 10" 1 S Remove 4901 Pseudotsuga menziesii Douglas Fir 8" 1 S Remove 4947 Pyrus calleryana Callery Pear 6" 1 S Retain 5010 Calocedrus decurrens Incense Cedar 9" 1 S Remove 5011 Calocedrus decurrens Incense Cedar 11" 1 S Remove Impacts 5015 Pseudotsuga menziesii Douglas Fir 11" 1 S Remove 5016 Pseudotsuga menziesii Douglas Fir 9" 2 Topped S Remove Impacts 5059 Pseudotsuga menziesii Douglas Fir 14" 1 S Retain 5066 Pseudotsuga menziesii Douglas Fir 11" 1 S Retain 5067 Pseudotsuga menziesii Douglas Fir 12" 1 S Retain 5138 Calocedrus decurrens Incense Cedar 7" 1 S Retain 5140 Populus nigra Black Poplar 8" 1 S Retain 5161 Pseudotsuga menziesii Douglas Fir 7" 3 Severely broken leader D* Retain 5173 Calocedrus decurrens Incense Cedar 6" 1 S Remove 5232 Calocedrus decurrens Incense Cedar 11" 1 S Retain 5233 Calocedrus decurrens Incense Cedar 12" 1 S Retain 5234 Calocedrus decurrens Incense Cedar 12" 1 S Retain *This tree is in decline. However, its location makes it unlikely to impact any target in the event of failure. Therefore, despite its poor health, this tree may be retained with low risk. Trees in decline provide beneficial habitat. If this area is impacted or improved, this tree should be removed. Condition Key: 1) Excellent condition and vigor, no defects noted 2) Good condition and vigor, minor defects or signs of decay, but no significant risk 3) Fair condition and vigor, defects or signs of decay are present but do not pose significant risk 4) Poor condition and vigor, significant defects, significantly declining, dying, or dead tree Limit of Liability The terms and evaluation forms used in this report are as laid out in the International Society of Arboriculture Tree Risk Assessment Manual, 2013. There are many conditions affecting a tree’s health and stability which may be present and cannot be ascertained, such as root rot, previous or unexposed construction damage, internal cracks, stem rot and more. Changes in circumstances and conditions can also cause a rapid deterioration of a tree’s health and stability. Adverse weather conditions can dramatically affect the health and safety of a tree in a very short amount of time. While I have used every reasonable means to examine DocuSign Envelope ID: 6CE3899A-1D0A-43F4-A678-6B93041EB30C Tree Report Page 6 of 6 King County South Treatment Plant these trees, this evaluation represents my opinion of the tree health at the time of the evaluation only. These findings do not guarantee future safety nor are they predictions of future events. The tree evaluation is a Level 1 Assessment as defined by the International Society of Arboriculture. It consists of a brief external visual inspection of an individual tree’s root flare, trunk, and canopy from the ground only unless otherwise specified. As conditions change, it is the responsibility of the property owners to schedule additional site visits by the necessary professionals to monitor the long‐term health and risk of the tree. This tree evaluation is to be used to inform and guide the property owner in the management of their trees. This in no way implies that the evaluator is responsible for performing recommended actions or using other methods or tools to further determine the extent of internal tree problems without written authorization from the property owner. Furthermore, the evaluator in no way holds that the recommendations are the only actions required to insure that the tree will not fail. Extreme weather conditions can cause even low risk trees to fail. A second opinion maybe sought if the client so desires. The client shall hold the evaluator harmless for any and all injuries or damages incurred if the tree examined fails for any reason or if the evaluator’s recommendations are not followed or for acts of nature beyond the evaluator’s reasonable expectations, such as severe winds, excessive rains, heavy snow loads, etc. If you have any further questions, please do not hesitate to call. Sincerely, Mary Ellen Russell, PLA Principal, Russell + Lambert Landscape Architects ISA Qualified Tree Risk Assessor DocuSign Envelope ID: 6CE3899A-1D0A-43F4-A678-6B93041EB30C