1410 GRAND AVE 2018-01-02 MF Import

GeoTest Services,Inc. May 6,2011 1470 Grand Avenue,Everett,WA Job No.11•0783 $OI� SUN@)I According to the United States Department of Agriculture (USDA) Natural Resource Conservation Service website, the subject property is mapped as Alderwood Gravelly Sandy Loam. The unit is described as basal till formed on till plains. According to the Soil Survey, the Aldervvood Gravelly Sandy Loam is rated as a low erosion susceptibility and has an erosion factor K (susceptibility of a soil to sheet and rill erosion by water) of 0.15. Values of K range from 0.02 to 0.69, and, the higher the value, the more susceptible the soil is to water erosion. Native soils observed within the vicinity of the project site are relatively consistent with the Soil Survey. COASTAL ZONE ATLAS According to the Washington State Department of Ecology's Coastal Zone Atlas, the south-facing shoreline slope on the subject property is mapped as "Intermediate". However, the DOE's disclaimer states, "these maps are intended to educate the public about the shoreline and to guide regional land use decisions. The maps SHOULD NOT be used as a substitute for site specific studies carried out by qualified geologists and engineers." Surface Conditions On April 27, 2011 a representative from �isited the subject site located at 1410 Grand Avenue in Everett Washington. The property is currently developed with an existing residence. Vegetation at the site consists of grass, brush and scattered small trees. The topography at the site slopes gently downward from Grand Avenue to the west for approximately 175 feet before reaching the top of a steep slope. The inclination then increases to a range of approximately 40 to 60 degrees and descends approximately 60 vertical feet to the railroad trecks. The slope is densely covered with various brush and wild grass. The existing deck and patio are located 25 feet from the top of the slope at its closest point and 37 feet at its furthest. Similar topography was observed on the adjacent properties to the north and south. All drain lines from the residence are currently tighlined to the base of the slope. A 3/8 inch pointed steel rod was used to probe the near surface soil at various locations in the vicinity of the existing patio and deck and penetrated less than 6 inch before meeting refusal on hard glacial till. Probing accessible areas of the slope face, penetration depth was less than 1 foot before refusal. No surface water was observed on the subject property at the time of our site visit. No obvious signs of recent instability, significant erosion or evidence of severe soil creep were observed on the subject property at the time of our site visit. CONCLUSIONS AND RECOMMENDATIONS Based upon evaluation of the data collected during ihis investigation, it is our opinion that the existing patio and deck have not adversely impacted the site slope nor will the (uture deck cover. We understand that all roof drainage will tie into the existing drainage system and be directed to the base of the slope. Page 2 of 4 �