330 HEATHER RD 2020-06-17 - Laserfiche WebLink

2401 10th Ave E GEOTECH Seattle,Was to 98102 CONSULTANTS, INC. (425)747-5618 November 15, 2018 JN 18517 Brian and Connie Hallgarth 920 Grand Avenue Everett, Washington 98201 via email:hallgarthal @msn.com Subject: Geotechnical Assessment- Foundation, and Landslide and Erosion Hazard Considerations Proposed Addition to Existing Residence 330 Heather Road Everett, Washington Dear Mr. and Mrs. Hallgarth: This report presents our geotechnical engineering observations and conclusions related to the planned construction of an addition on the west side of your existing residence. In order to develop the conclusions and recommendations presented in this report, we have accomplished the following tasks: • Made a visit to the property on October 29, 2018 to observe the existing conditions on the site and surrounding properties, and to discuss the project with you, • Reviewed the results of explorations that our firm has previously conducted in the vicinity, and • Reviewed available geologic maps for the site vicinity. Based on the information provided, we expect that a narrow addition will be constructed on the west side of the house to widen the rear rooms and make them more functional. This addition would be approximately 5 feet wide and will be one story in height, consistent with the existing house. A new continuous footing will be constructed to support this addition. The existing patio may also be extended 5 feet to the west of its current footprint, in order to maintain the same approximate size. The addition will be over 30 feet from the crest of the steep western slope. No grading or earthwork is planned to occur in this 30-foot setback, or on the steep slope itself. According to the City of Everett's mapping, and our review of Everett Code section 19.37.080, the upper half of the steep western slope is mapped as a High Landslide Hazard, while the lower half is a Very High Landslide Hazard. The slope is also mapped as an Erosion Hazard Area. SITE CONDITIONS The existing house is a one-story rambler situated on the eastern portion of the lot. Access to the garage in the southeast portion of the house is provided by a driveway extending westward from Heather Road. The eastern portion of the lot is relatively flat. West of the house is a small on- grade patio, with grass-covered yard extending between the patio and the crest of a steep, west- facing slope that continues down into a deep ravine contained within Howarth Park. This steep slope extends across the adjacent southern and north lots. Olympic Boulevard curves along the bottom of the ravine slopes. GEOTECH CONSULTANTS,INC.