3821 SHORE AVE 2024-02-28 - Laserfiche WebLink

February 28, 2023 G-5835 3821 —Shore Ave Everett, WA Page 2 topography near the site's eastern and central limits, and moderately to steeply sloping topography near the site's western limits. The moderately to steeply sloping topography extends beyond the site's northern southern, and western limits to the neighboring developed residential properties. An approximately 3 to 4 feet tall segmental concrete block retaining wall was previously constructed near the top of the moderately to steeply sloping area near the site's northwestern corner. We observed the existing retaining wall had become overturned,possibly due to poor drainage of the wall's backfill, and was in a state of disrepair. Description of Proposed Project Based on our discussions with you, and the Notice to Comply(CE22-1217)dated December 21, 2022 by the City of Everett, it is our understanding that an approximately 4 feet tall ecology block retaining wall is proposed near the top of the moderately to steeply sloping terrain near the site's western limit. We observed wall construction, including the placement of a gravel leveling pad, installation of a subsurface drainage system, and the placement of the ecology blocks had been completed prior to the posting of a Stop Work Order. We observed the ecology blocks had been placed on relatively flat topography approximately 10 feet east of the moderately to steeply sloping topography near the site's western limit. GEOLOGIC OVERVIEW The published geologic map (Distribution and description of geologic units in the Mukilteo quadrangle, Washington, Minard, J.P., 1982) for the site vicinity indicates the relatively flat, eastern and central areas of the subject property are overlain by Quaternary age transitional bed (Qtb) deposits, and the sloped area near the property's western limit is overlain by Quaternary age Whidbey formation (Qw) deposits. Whidbey formation deposits typically consist of medium to coarse grained sands that were deposited over 40 thousand years ago. Localized peat beds and organic-rich sand layers have been identified in the upper part of the formation. Transitional bed deposits typically consist of thick clay, silt, and fine-grained sand beds that were deposited in lakes and fluvial systems prior to the advance of the Puget glacial lobe during the last glaciation period which ended approximately 15,000 years ago. As both of these geologic units were overridden and compressed by the Puget glacial lobe,undisturbed deposits are very dense and over consolidated. GEO (Troup Northwest, Inc.