2325 TAYLOR DR Geotech Report 2022-10-25

• January 26th, 2018 G-4588 2325 Taylor Drive Page 3 Field Investigation: GEO Group Northwest visited the project site on 1/17/18 to perform field reconnaissance and evaluate the steep slope connecting to the backyard area of the existing property. The slope is very steep and well-vegetated, making it inaccessible. Consequently,the slope was assessed based on visual observation from a vantage point at the top of the slope. The range of visible area on the slope was further limited by vegetation growing on the slope. Based on visual observation, no signs of slope movement were observed on the slope(e.g. scarps, raveling, leaning trees, etc.). The slope appeared to be well-vegetated, except for the area extending about 15-feet from the top of the slope which was occupied by organic debris (see additional observations summarized below for more details). Smaller vegetation on the slope consisted mostly blackberry bushes with some ivy,while the trees on the slope consisted of mostly younger deciduous trees. None of the trees appeared to be leaning over, which would suggest recent movement on the slope had taken place. Also,no groundwater nor evidence of erosion were observed on exposed portions of the slope. A '/2-inch steel T-probe was utilized to assess the condition of the soils at the top of the slope. These soils probed approximately 6 to 8 inches before reaching apparently denser soils. Additional observations made during this site visit are listed as follows: • Sizeable amounts of organic debris composed of grass-shavings (from a lawn-mower), branches, and leaves appeared to have been dumped onto the slope. This debris was observed in the area that extends approximately 15-feet north of the top of the slope, and obscured any existing vegetation that might be growing on the slope in this area. • A corrugated plastic pipe protrudes horizontally from the top of the slope near the west property-boundary and then descends down the slope, presumably all the way to the bottom of the slope. The sound of running water inside the pipe was audible. The portion of the pipe that is visible from the top of the slope appears to be intact, and no signs of leakage were observed. • The sound of running water coming from about 20 to 25 feet down the slope near the eastern property-boundary was also audible, but we were unable to see the source. Conclusion and Recommendations: EMC standards were referenced when considering the proximity of the proposed development to the geologic hazard on the property(i.e. the steep slope). EMC 19.37.080(B)(2) designates the International Building Code(IBC) as an authority for determining appropriate buffers for geological hazards. For foundations setback from descending slopes,IBC chapter 1808.7.2 requires buildings to be setback a minimum of 40 feet from the top of steep slopes. The setback GEO Group Northwest,Inc,