500 LAUREL DR 2016-01-01 MF Import

Geotechnical Engineering Study Page 31 00-2267 Three Story Addition - 500 Laurel StreCt, Everett January 31, 2001 nearest point of the modified residence will be approximately twenty-two and one half feet (22.5) feet away from the crest of the westem bluff slope. The existing site topography between the residence and the crest of the slope is gently sloping to relatively flat and is covered with sod !awn or "wild" native vegetation or landscaping. In addition, along the westem end of the gravel driveway there is an already constn.icted retaining wall system that preserves the integrty of?he site and maintains "unused" space between it and the slope crest. I� add�t�on, there is a chain link f�nce set between ab�ut five and eighteen !� 8) feet back from the slope crest that separates the residence, driveway and lawn areas from the slope crest. Given the considerable age of the existing residence, and in consideratien of the generally posit�ve results of our slope stability evaluation, it is our professional opinion that the area between the residence anci the crest of the westem biuff slope is stable and competent, particularly if it remains undisturbed. Since the proposed construction effort is to remain at least twenty (20) feet away from the slope crest it appears to us that the slope area will not be disturbed in any way. Consequently, it is our professional opinion that the existing approximately twenty-three (23) foot wide building setback from the crest of the westem bluff slope is adequate. This distance provides more than sufficient space for pedestrian an� equipment access to the proposed construction area and is sufficient to prevent any structural loads from being imposed on, or through, the face of the bluff slope. Site Drainape General: Although no established groundwater elevation or �roundwater seepage was encountered at shallow depth during our field exploration, it is possibie that a fluctuating groundwater or seepage level could be encountered during the lifetime of the projact, particularly durin� the wetter winter months (typically October through May). In addition, changes in rainfall amounts, s�rface drainage or other facto�s can cause these levels to fluctuate. I Based on observed subsurface conditions at the site, we do not perceive that groundwater or seepage i� likely to have a detrimental impact on the overall I constructio�n. However, we believe i; is prudent to install both short and long-term drainage control measures as part of project design and construction. �5