5726 1ST DR W 2016-01-01 MF Import

Geo�Engineer� ' April 19, 1993 Geotcchnical. Gcocncironmental and Geologic Sercices $elect HOmes 237 Elm Street Everar, Wathington 98203 Auentioa: Mr. Randy Clazic . Building Setback Conditions Hanabrook Develolment Divisions III end IV Everdt, Washington Flle No. 2670-0OS-R06 1be pu�posa of this letta is to oudine reduced building s�bacic conditions for location of 6omes u the tops of slopes on Divisions III and IV of the Hanabrook Developmeat in Everat, Wachin¢ton. 'lbis hat baen discussed wit6 Mr. Randy Clazk of Select Humes, Mr. Pat McCouct of Univasal Brokaaye Corporation, and Mr. Michad Crowson of Wd:H Pacific. We have observed no signs of instability on native alopes in Divisions III and IV. Fill slopes on Divisions III�nd N wae coastiucted with stcuctural fili coasisting of on-site granular soils under full-time monitoring of� qualified individual from our firm. 1be suuctural fill is keyed inw eaisting fum nadve soils and fill placed to achieve the final slope grades has been properly benched into ezisting native materials and compacted to 95 percent of MDD(maximum dry density)according to the specificadons�f the ASTM D-1557 test procedure. 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 bE�en placai, compaaed, graded, and vegetated as described above, the minimum building saback distance can be reduced to 10 feet. The setback distance is the 6orizontal distance m^asured from the front face of the footing to the face of the slope. It should be understood that if the setba,:k distance is reduced to 10 feet, the risks of losiag access, reducing the design life of the foundations and having slope movement impact the house foundations are increased. .,.��,.•. .. .`rlL.i i . .... ?lu.�\ _ � . �Klci_ . n�� F:'� :�n.IR1J�an:n `'�"_ 'e:�.:e:w:r�