5010 DOVER ST Geotech Report 2025-07-31

2 August 22nd 2022 G-5756 Ben Erickson Page 2 SITE CONDITIONS Site Description The project site is located in Everett,Washington, as illustrated in Plate 1—Site Location Map. The parcel is rectangle-shape and consists of 0.47 acres. The site is bounded by other single family residential properties to the north, south, and Dover Street to the east with a critical area slope leading down to Philips Creek at the far west side of the property.The existing single- family residence was built in 1987 and has approximately 1350 square feet of total living space and the house is a two story, split level, with no basement. Description of Proposed Development The proposed addition will be an addition to the second story only that extends 13 feet to the west and 11 feet to the south of the existing house in place of the current deck off the west most side of the property.Please see Plate 2—Site Plan SITE INVESTIGATION Geologic Overview Based on a review of the geologic map of the area,the project site overlies Transitional beds (Qtb).These deposits typically consist of clay,silt and very fine to fine sand. These sediments were deposited in still to slowly moving water,except coarse stream deposits in the lower portion of the formation. These beds were deposited between glacial advance and retreat cycles in the Fraser glaciation to Pre-Fraser Glaciation. Subsurface Investigation On August 8th a Staff Engineering Geologist from our firm,visited the site to perform a visual reconnaissance of the site and investigate the subsurface soil conditions and critical area slope. Two borings were drilled using hand-auger equipment. The boring locations are illustrated on Plate 2—Site Plan. Hand Auger 1 (HA-1), consisted of a 2-inch layer of topsoil with mulch,that was underlaid by grey-brown, dry,medium dense silt with a chalky laminated texture.At a depth of 1 foot,the silt became very hard and the auger reached refusal. GEO Group Northwest,Inc.