3431 NASSAU ST 2018-01-02 MF Import

Addendum to Ge )lactic Invest on and Geotechnical Enr,neerine Report 04-08-10 Proposed Single F:unily Residence NE Comer 35" St. and Nassau St.. Everett. Wa. 4.3 Structural Fill The recommendations contained in the Geotechnical Report are valid with these additions — existing on site uncontrolled fill may be reused provided the placement of the materials is approved by GES, Inc. prior to use and all deleterious mazer' ils are removed prior to placement. The exception being asphalt and concrete less than 4" in diameter or flat surface length which may be left in the fill. Where foundation bearing soils need to be raised above adjacent elevations or above the prevailing ground water table, we recommend that this be done utilizing 6" — 8" quarry spalls or where approved by GES, Inc., 2" to 4" crushed rock. Controlled Density Fill (CDF) is still an approved alternative, especially in areas where its unique characteristics are needed such as within the existing uncontrolled fill. The use of crushed rock, quarry spalls or CDF should be approved by GES, Inc. for each specific use based on observed conditions at the time of construction. Stockpiled soil on the site should be covered with visqueen to control run-off, erosion and the saturation of the stockpiled soil from wet weather conditions. 4.4 Cuts and Excavations The mconimendations contained in the Geotechnical Report are valid with this addition — slope laybacks for foundation excavations will require significant room. Given the location of the proposed new residence on the lot, this will place excavation limits very close to the actual property line. Again we reiterate that the safety of any cuts, excavations and exposed slopes is the responsibility of the contractor since Ire is on site on a regular and continual basis and is directing the work being completed on site. GES, Inc. is available to observe and provide recommendations for any areas of concern upon request. 4.6 Foundation Placement and Design The recommendations contained in the Geotechnical Report are valid with this addition — bearing soil will be found at varying depths based on the most recent site investigation. Bearing soil will be found 2.5 to 4.0 ft. below existing site grades at the northern sections of the proposed residence. Foundation elements in this area will need to be placed on 2" to 4" crushed rock per the recommendations contained in sections 4.3 and 4.6 of the report. Based on the the new site information, depths to bearing soil in the foundation areas covered with uncontrolled fill range from 14 to IS ft. below existing site grades. We recommend that bearing soil be confirmed by a representative of GES, Inc. prior to the placement of any crushed rock (where necessary) or f,)oting forms. Excavation for the foundation will require significant movement of dirt and regrading of the site. For improvements located outside of the main foundation area such as driveway, porches, etc., we recommend that these improvements be placed on a minimum two-(2) feet of structural fill placed per the recommendations contained in section 4.3 of this report or upon foundation elements placed as recommended above. Depending upon the amount of uncontrolled fill found below the improvement and 4 GES, Inc. vw