4518 SEAHURST AVE 2020-01-14 - Laserfiche WebLink

Q U O 1 E C401 10th Ave E Seattle,Washington 98102 CONSULTANTS, INC (425)747-561$ FAX(425)747-8561 July 13, 2016 JN 15186 Jeffrey Naranjo 201 -2nd Street South#109 Kirkland, Washington 98033 Subject: Tree Removal Concerns 45xx Seahurst Avenue Everett, Washington Reference: Geotechnical Engineering Study, subject site, Geotech Consultants, Inc., May 18, 2015. Dear Mr. Naranjo: We understand that you plan on removing several trees on the site in the areas described in the attached plan. The trees are a mix of deciduous and coniferous. The City of Everett has asked that we prepare a letter of opinion from a geotechnical standpoint on this issue. Based on the topographic survey provided, none of the trees on the western half of the lot are in steep slope areas and the trees on the eastern part of the site appear to be being removed to make way for the proposed site improvements. Only three of the tree removals not associated with the house improvements are in areas on sloping portions of the site. For the three trees in question (circled in the attached plan), we recommend that the subject trees be coppiced. Based on our experience with the site and our experience with similar local projects, it appears that coppicing the trees in question can be accomplished without sacrificing overall slope stability. The stump and root systems should be left in place to supply soil stabilization in the area of the rootball, and a revegetation plan should be developed to replace the rain interception supplied by the removed trees. None of the remaining proposed tree removals is a cause for geotechnical concern as all of the trees except the three along the southern property line near the center of the lot are on relatively flat portions of the site or will be replaced with retaining walls or house structure. The recommendations presented in this report are intended to allow removal of the subject trees without an overall reduction in the stability of the slopes. We believe this can be accomplished if the recommendations provided in this report and the arborist's recommendations are followed. No grading should occur on, or near, the top of the slope. Extraneous disturbance of the vegetation on the slope outside the construction area should be limited as much as possible. Significant landscaping or clearing of the slope should only occur in conjunction with a sequenced landscape plan. Water from downspouts, surface drains and footing drains should not be discharged onto the site slopes. We trust that this report meets your immediate needs for the proposed development. Please contact us if we can be of further service. Respectfully submitted, 00—roivs7, GEOTECH CONSULTANTS, INC. G., bF WAg • 4*„440• 1'l ,,~�'-� �ec609 9 ti: James H. Strange, Jr., P.E. -%/vAi,e 'lai16 Associate JHS:jhs /(0-' GEOTECH CONSULTANTS,INC.