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20160412123925.pdfM.S.C.E., M.B.A. _ .. clinGeotec ical /Civil Ec� 7�r� City of Edmonds c/o Gene Bolin Permit # BLD 2015 096 APR 12 2016 Final e ort eotechnical Ins actions 7330 172"d. Ave. S.W. Bolin 1i0 DNIS10N This engineering report presents the FINAL results of geotechnical inspections throughout the project. These inspections were required as a condition of permit by the City of Edmonds. References: - Geotechnical Reports and Designs by D. Bruce, P.E. - City of Edmonds approved plans Inspections: This engineer has performed on site inspections since July, 2015 in conjunction with the previous "failing" wood landscaping and retaining walls. The pre-existing walls existed on adjoin properties ( Bolin and Murray ) and this engineer consulted with both parties during the design and inspection of the new replacement stabilization walls. lames _ecti ite Soil Bearing: Verified a minimum of 3,000 ps.f. bearing capacity on native soils. Approved. Drainage Zone: Verified a min. of 8 " thick gravel drainage zone behind walls. Approved. Geogrid Matrix: Verified proper placement of geogrid matrix where designed. Approved. Structrual Fill: No structural fill was required for block support purposes. However, all base blocks were properly supported on a min. of 6 " compacted crushed rock. Approved. Block Wall Construction: Verified base block embedment, block linkage, block batter, overall " blending -in" of the wall with the natural and pre-existing topography. Approved. Summary: - The replacement block walls have been properly completed, per City of Edmonds approved plans and geotechnical inspections. The stability of both properties has been improved. Dennis M. Bruce, P.E. Geotechnical / Civil Engineer SOILS e FOUNDATIONS v SITE DEVELOPMENT e INSPECTION a DRAINAGE 9 DESIGN& PERMIT & LEGAL P.O. Box 55502 - Shoreline, WA 98155 - (206) 546-9217 7330 172nd St. S.W. Failed timber wall (onto Bolin drive) Stable slope on 7312 property ( Donaldson ). Stable slope ( on Donaldson prop.) Bolin garage at right. Setting stable Keystone blocks ( former failed timber wall) 2006 patio addition supported on deep pier foundations. Note stable soil cut, former gravel drainage zone. Good. 7330 172nd St. S.W. viewing northerly. Donaldson residence in background. Wall failed. A proper stabilizing wall is required. Lower failed timber wall being replaced per Geotech. Engr Base blocks well set on compacted crushed rock. Drainage zone, block linkage, batter properly done. Geotech. inspections verified slope stability during work 7330 172"'. St. S.W. 7330 172nd. St. S.W. " t Son. ONG4 SF&-UWAfW ALL, cog m�� m"�d[��d iu� i� � � m °lid ulm��. 60 merlis qvm pE'mt-r -s Ll oZatS©� 7330 172"d St. S.W. Completed replacement wall. Geotechnical inspections verified proper construction. The previous "failing" timber walls have been properly replaced with a Keystone block wall with drainage zone. Slope stability improved for both properties. 01 Easterly ( uphill) residence and property not adversely impacted by new wall. The overall slope has been stabilized with regard to erosion control. Approved.