5915 4TH DR W 2018-01-02 MF Import

GCOO Engineers Select Homes 237 Elm Street Everett, Washington 98203 Attention: Mr. Randy Clark April 19, 1993 Geotechnical, Gcoemimn mental and Building Setback Conditions Hanabrook Development Divisions III and IV Everett, Washington File No. 2670-005-R06 Geologic services The purpose of this letter is to outline reduced building setback conditions for location of homes at the tops of slopes on Divisions III and IV of the Hanabrook Development in Everett, Washington. This has been discussed with Mr. Randy Clark of Select Homes, Mr. Pat McCourt of Universal Brokerage Corporation, and Mr. Michael Crowson of W&H Pacific. We have observed no signs of instability on native slopes in Divisions III and IV. Fill slopes on Divisions III and IV were constructed with structural fill consisting of on -site gramdar soils under full-time monitoring of a qualified individual from our firm. The structural fill is keyed into existing firm native soils and fill placed to achieve the final slope grades has been properly benched into existing native materials and compacted to 95 percent of MDD (maximum dry density) according to the specifications of the ASTM D-1557 test procedL. a. In addition, the lots are graded to slope away from the tops of slopes and all slopes have been covered with jute matting and hydroseeded for erosion protection. In our opinion, where slopes have been placed, compacted, gmdad, and vegetated as s escribed above, the minimum building setback distance can be reduced to 10 feet. The setback distance is the horizontal distance measured from the front face of the footing to the face of the slope. It should be understood that if the setback distance is reduced to 10 feet, the risks of losing access, reducing the design life of the foundations and having slope movement impact the house foundations are increased. ciwEngun,rs. In(. 5-110 high .avenue N.E. Rt*iond. \XA 98OU I&.111,111e 1: bl $41149%x) t.IS Ili M11411dd1$I IN "'. v'eoceo NN'