4501 COLBY AVE 2016-01-01 MF Import

✓', lc � - �: J `� [:. r -.J� p•:Bm WA99t3� 35�. � � GCOTG'ST . .` i.` February 5, 2007 Job No. 07-0028 Niles Jelvik 4501 Colby Avenue Everett, Washinglon 56203 Re: Slope Evaluation 4507 Coiby Avenue Everett,Washington Dear Mr. Jelvik: As requested, we have visited the subject site on January 19 and 22, 2007 in ord^r to provide an evaluation of slope stability and any geologic hazard the slope presents '� the proposed residence and detached garage. Based on observations during our si!e reconnaissance, our understanding that the proposed residence w�ll consist of a daylight basement construction, and lhe minimum 30 foot detached garage setback from the top oi the slope, it is our opinion the site presents a relatively low hazard to the proposed structures, provided the recommendations in this report are foliowed. Site ObservaHons The subject property is located on the east side of Colby Avenue in Everett. Washington. It is our understanding that the proposed construction is to c�nsist of a single family, two story, wood framed residr.nce with the botlom story consisting of a daylEght basement, located near the southern portion of the lot, and a detached garage located near the northern porlion as sho�vn on the attached Site Plan, Fig�re 1. The exact size and location for the proposed residence has yet to be delermined. The property currently has a single fan�ily residence located on the northwestern portion oi the site. The topography of the lots is relatively flat for approximatety 125 feet east of Colby Avenu� and then descends west at an inclination ranging from approximately 30° to 40° for approximately 16 vertical feet on the northern edge of the property to approximately 12 vertical feet on the southern edge of the property. The slope then degreases to aparoximately 5° for the remainder of the lot. The adjacent properties to the north and south of the subject lut have similar slope configurations. Geoiogic information for the project site was obtained from the U.S. Geological Survey (USGS) oniine map of Washmgton State. According to the USGS, the vicinity of the project site is mapped as Pleistocene age deposits of glacial till. Soiis defined as glacia� tili typically consist ot a dense, unsorted mixture of boulders, cobbles, gravel, and sand in a matrix of silt and clay with some lenses of sorted, stratified sand and gravel. This unit typica��y exhibits low permeability and high shear strength, characteris!ics resuiting frorn compaction by the weight of a glacier. Surficial observations at the time of this investigation and review of test pit logs excavated on January 22. 2007 revealed dense, sandy gravel with cobbles, consistent with the mapped geology. Vegetation on the site consisted of mainly grass. At the time of our visit, we did not observe obvious visual indications of slope instability, such as fresh soil exposures, Page � of 5 �I /J I �