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,, Earth <br /> Y I Solutions <br /> N Yi'ltc <br /> April 2,2015 Earth Solutions NW LLC <br /> ES-2232.02 <br /> • Geotechnical Engineering <br /> Underwood Gartland Everett, LLC • Construction Monitoring <br /> P.Q. Box 3513 • Environmental Sciences <br /> Bellevue, Washington 98009 <br /> Attention: Mr. David Gartland <br /> Subject:: Rockery Design Details <br /> Proposed Wet Ponds ' REQ <br /> Underwood Gartland Everett t..t OF p' Rt' <br /> Associated Boulevard REVIEWED fOR <br /> Everett, Washington <br /> Reference: David Evans and Associates <br /> Storm Drainage Plan <br /> Sheet C-06 <br /> Dear Mr. Gartland: <br /> In accordance with your request, Earth Solutions NW, LLC (ESNW) has reviewed the <br /> referenced Storm Drainage Plan and rockery alignment for the wet ponds. Rockeries will be <br /> constructed along the margins of the wet pond excavations. The maximum rockery height will <br /> be 8 feet. Based on our review, the proposed rockery construction is acceptable from a <br /> geotechnical standpoint. Cut rockeries can be utilized where pavement areas will not be <br /> located immediately adjacent to the top of wall. Plate 1 (attached) provides recommendations <br /> for construction of cut rockeries. Along the east side of the Emergent Cell Wet Pond, traffic <br /> surcharge will be imparted to the top of rockery. In this case, the rockery should incorporate <br /> geogrid reinforcement to accommodate the vehicle surcharge. Plate 2 (attached) depicts the <br /> requirements for a geogrid reinforced rockery. The geotechnical engineer should observe and <br /> document the rockery construction, and provide supplement recommendations, if needed. <br /> We trust this letter meets your current needs. If you have any questions, or if additional <br /> information is required, please call, <br /> Sincerely, 4. A <br /> a <br /> c?'w'A '� ,' 4 <br /> EARTH SOLUTIONS NW, LLC p� <br /> o. <br /> Raymond A. Coglas, P.E. ' <br /> Principal ,E 0° <br /> Attachments. Plates 1 and 2 <br /> 1805-136th Place N.E.,Suite 201 • Bellevue, WA 98005 • (425)449-4704 • FAX(425)449-4711 ,# /2'-') <br /> `"'" <br /> Earth Solutions NW,LLC <br />