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Retaining Wall Interim Option Construction Summary Page 2 March 26,2017 <br /> 4841 Glenwood Avenue,Everett Washington RGI Project No.2016-072 <br /> The soils excavated were stockpiled on plastic and covered with plastic as recommended. The <br /> exposed soil was compacted to seal the surface the chips and straw was placed on the exposed <br /> soil for erosion control. <br /> Remaining Block Wall <br /> This interim solution does not improve the overall stability of the remaining wall to current <br /> design standards due to the lack of batter, poor drainage and inadequate compaction of the <br /> backfill soil. The existing wall currently is either leaning towards the soils retained (northern end <br /> of the wall) near vertical or leaning slightly away from the soils retained (south end). <br /> The southern end of the wall was measured with a tape and plumb bob and the wall currently <br /> slopes away from the retained soils at 1.5 percent in the northern two thirds to 2.5 percent in the <br /> southern third of the remaining block wall where only the top block was removed. This tilt <br /> appears to be consistent over the full wall height and removing another block from the wall will <br /> not change the overall tilt of the wall. This type of wall is constructed at a one in ten batter or 5.7 <br /> degree tilt and the wall is typically stable without backfill. <br /> Although the wall is tilting slightly away from the retained soils, the likelihood of the block <br /> tumbling off the wall is relatively small. The wall still need to be completely replaced with a new <br /> wall designed and constructed in accordance with current design standards. <br /> Limitations <br /> This letter is the property of RGI, Caliber Real Estate Services LLC, and its designated agents. <br /> Within the limits of the scope and budget, this letter was prepared in accordance with generally <br /> accepted geotechnical engineering practices in the area at the time this letter was issued. This <br /> letter is intended for specific application to the retaining wall at 4841 in Everett, Washington, <br /> and for the exclusive use of Caliber Real Estate Services LLC and its authorized representatives. <br /> No other warranty, expressed or implied, is made. Site safety, excavation support, and <br /> dewatering requirements are the responsibility of others. <br /> Please call us at(425)415-0551 if you have any questions or need additional information. <br /> Respectfully submitted, <br /> THE RILEY GROUP,INC. <br /> MA-RL& W <br /> ca��OF <br /> WASI� <br /> �� b 0 1� <br /> 33182 <br /> A <br /> Kristina M.Weller, PE -'112,6,117 <br /> Principal Geotechnical Engineer <br /> 1 <br /> ►W <br /> RILEYGROUP <br />