2223 TAYLOR DR 2020-06-30 - Laserfiche WebLink

l r GeoTest Services,Inc. October 24,2014 Jacobson Deck and Garage Improvements,Everett,WA Job No. 14-0554 GTS observed what appeared to be roof- and yard-drain pipes that extended out onto the slope, generally in the upper 1/3 to 1/2 portion of the slope. There were a total of 3 pipes that were observed and the pipes appeared to consist of PVC pipe that discharged directly onto the slope. GTS generally observed evidence of minor sloughing and erosion sediments collecting below the daylighted portions of the drain pipes. To the south of the existing residence, in the general area of the proposed garage improvements, GTS observed minor slopes descending toward the north. Native vegetation has been almost entirely removed and replaced with irrigated lawns and landscaping. GTS observed concrete drives accessing the residence and paved drive paths to the southof the residence. GTS observed that a sewer manhole exists near the entrance to the property and evidence of other below-grade utilities that exist on the property. CONCLUSIONS AND.RECOMMENDATIONS According tothe referenced City of Everett Municipal Code (EMC), Title 19, Chapter 37.080, Geologically Hazardous Areas, geologically hazardous areas include areas susceptible to erosion, landslide, rock fall, subsidence, earthquake, or other geological events that pose a threat to the health and safety of citizens when incompatible development is sited in areas of significant hazard. It is our understanding that the City of Everett has identified areas on the subject property that contain erosion and landslide hazards. It must be understood and accepted by the property owner that living on properties that contain geologically hazardous areas have inherent risks that no amount of engineering can fully mitigate. The intent of this letter is to inform the property owner of the inherent risk and provide mitigation that will decrease, but not fully eliminate, risks associated with steep slopes and erosion hazards. It should be understood that the risk for future slope instability on this property is considered high based on evidence of historicslope creep and past failures, but that the risk is based on the geometry and geology of the slope and not the planned improvements to the kitchen, deck, and garage areas. It is our opinion that the proposed improvements present a low risk for disturbance to geologically hazardous areas and will not decrease slope stability, increase erosion potential, or increase risk to life or property. The proposed improvements are within or adjacent to the footprint of an existing deck and, in the case of the garage, over an existing enclosed garage area. The proposed deck and kitchen improvements will not exert new structural loads thatwere not already present within the footprint of the existing deck. The structural loads for a deck are considered very light and pose little risk to the stability of the slope. The proposed garage improvements do not extend any closer to geologically hazardous areas and are not expected to have significant structural loads that would impact slope stability. In short, the proposed improvements are not expected to present any additional risk to the property than what is already present due to the steep slopes that currently exist to the north of the residence. GTS has provided mitigations in the following section that will reduce the risk to, but not eliminate, steep slope and erosion hazards on the property. Page 3 ofXr