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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 <br />Matthew X. Miller, P.E. <br />Principal Engineer <br />Attachments: <br />A. <br />rj I �2Z� <br />�� JUJL7�G O <br />Stephen A. Siebert, P.E. <br />Associate Geotechnical Engineer <br />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 />