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Kierstein Residence Retaining Wall <br /> Everett Washington Geotechnical Engineering Report <br /> constructed with sufficient gradient to allow gravity discharge to a suitable discharge location. <br /> In our opinion, given the anticipated negligible flows from the wall drain, we consider a <br /> discharge pipe to a splash pad located in front of the wall base at the top of the slope <br /> appropriate. The splash pad could be constructed of quarry spalls. In our opinion, this approach <br /> is better than construction of a tightline drainage pipe down the slope which would cause <br /> significant disturbance to the slope. <br /> CONSTRUCTION MONITORING <br /> We recommend that AESI provide geotechnical monitoring during construction of the new <br /> retaining wall to verify conformance with our design. AESI will need to be on-site for the <br /> following: <br /> • Verify the wall base bears on suitable subgrade soils. <br /> • Verify placement of wire-formed facing is in accordance with the plans. <br /> • Verify proper installation and type of geogrid. <br /> • Verify placement and compaction of wall backfill. <br /> • Verify installation of proper wall drainage. <br /> CLOSURE <br /> It has been a pleasure to assist you on this project. If you should have any questions, please do <br /> not hesitate to call. <br /> Sincerely, <br /> ASSOCIATED EARTH SCIENCES, INC. <br /> Kirkland, Washington 4� N A.Sr�� <br /> ��. <br /> V WAS wog • <br /> ,,d 30329 O �4 <br /> ''f'p CISTERti <br /> �S:SrpNAL��� <br /> Matthew . Miller, P.E. Stephen A. Siebert, P.E. <br /> Principal Engineer Associate Geotechnical Engineer <br /> Attachments: Figure 1: Vicinity Map <br /> Figure 2: Site and Exploration Plan <br /> Figure 3: Geologic Cross-Section A-A' <br /> Appendix: Exploration Logs <br /> July 1, 2022 ASSOCIATED EARTH SCIENCES,INC. <br /> SASlih-20180614EO01-002 Page 8 <br />