Laserfiche WebLink
f <br /> F ' <br /> 1 � <br /> April 2, 2015 Earth Solutions NW LLC <br /> ES-2232.02 <br /> • Geotechnical Engineering <br /> Underwood Gartland (Everett, LLC • construction Monitoring <br /> • Environmental Sciences <br /> P.O. Box 3513 <br /> Bellevue, Washington 98009 <br /> Attention: Mr. David Gartland <br /> Subject: Rockery Design Details <br /> Proposed Wet Ponds <br /> Underwood Gartland Everett off. `,J t <br /> Associated Boulevard v F(3'p, <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, X014 A O Z <br /> _4` p'-N,YA ftl yJ, �J <br /> EARTH SOLUTIONS NW, LLC �' 1' n� <br /> „Ic o <br /> Raymond A. Coglas, P.E. <br /> Principal <br /> ` <br /> Attachments: Plates 1 and 2 ASIC)y A r, <br /> 1805 - 136th Place N.E., Suite 20"1 Bellevue, WA 98005 (425)449-4704 ° FAA'(425)449-4711 <br /> Earth Solutions NW, LLC <br />