1209 MADRONA AVE 2016-11-17 - Laserfiche WebLink

, , � � � !. _ � - � � •, r , ; � �+. � ' _ �._ � , _�. '�� .�. `+�F � .L, 7 �.S�C3TECi-�P�dIC�,L �I'ritai[�t�ERS � �E�3LOGISiG` Main Office 17311 — 135"' Avenue NE, A-500 Woodinvilie, WA 98072 (425) 486-'t B69 FAX (425) 481-25'10 (425) 337-1669 Snohomish County March 11, 2013 Mr. and ?vlrs. Roberi and Heidi Packer 1209 Madrona Avenue Everett, Vv'ashington 98203 Geatechnical Engineering Evaluation Packer Propea-ty �tetainitag Walls �nd Steep Siope Evatuation Everett, V4'ashington NGA File No. $7Q113 Dear Mr. and Mrs. Packer: Engineering-Geology Branch 437 East Penny Road Wenatchee, WA 9884i (509) 665-7896 FAX (5Q9) 665-7692 ��Je are pleased to sub��it the attached report titled "Geotechnical Engineering F..,va3uation — Packer F'roperty — Retaining VJalls and Steep Slope F..,valuation — Everet�, Washin�tan." This report summarizes the existi�ig surface and subsurface conditions within the vicinity of the eaisting block retaining walls and recent slope failure, and provides recommendations for improv'rng slope condifions. Our services were completed in general accordance �vith the proposal signed by you on January 18, 2013. The property is currentiy occupied by a single-family residence within the southern portion of tl�e site. A steep northwest-facing slope is located to the north of the residence. The portion of the steep slope along the western property line appears to be an old ravine area. The neighboring praperty to the west slopes steeply down to your western property line and appears to share the steep slope area within tl�e old ravine. Several tiers of short block retain.iztg watis were constructed on the steep slope within the northern portion of your property over the past 10 years or so. In genexaI, these ��alls appear to have e�perienced little to no niavement sinee they have been constnicted starting in ihe early 2000's. Hou••ei�er, a small section of one c�i fhe walls that is not in the direci vicinity of the slide has experienced same setilement whieh yau are in the process of repairing. We understand that drains have been installed behind aIl of the retaining walls; and the residenc� drains have also been tightlined into corru�ated pipes that descend dawn the steep slope and disch�rge near the ioe of the slope. A landslide recently occurred on the steep slope belou= the retairting walis orl your property and your neighbor's properly� to the west at the end of November 20d2. This landslide included the steep slopes on the neighbar's property above the ravine and the portion of the ra�7ne directty below your second lowest retaining wall. The slide debris travelled t.oward the railroad tracks below. I'ou infonned us that landslides have occuzxed a few times within this area since you pw-chased the property in 1996. We understand that the largest landslide accurred in ]996 before any retaining walls were builf or vegetation disturbed.