Laserfiche WebLink
Earth <br /> Solutions <br /> NWrrr I <br /> February 9, 2017 Earth Solutions NW [lc <br /> ES-4011.05 <br /> • Geotechnical Engineering <br /> • Construction Monitoring <br /> • Environmental Sciences <br /> I <br /> LBG 38, LLC <br /> 1040 West Georgia Street, Suite 800 <br /> Vancouver, BC Canada V6E441 <br /> Attention: Mr. Tom Timmons I <br /> Subject: Infiltration and Low Impact Development Evaluation <br /> Proposed Soundview Technology Center <br /> 36th Avenue West and Seaway Boulevard <br /> Everett, Washington <br /> Reference: Earth Solutions NW, LLC <br /> Geotechnical Engineering Study <br /> ES-4011.05, revised December 13, 2016 <br /> Washington State Department of Ecology <br /> Stormwater Management Manual for Western Washington , <br /> Publication Number 14-10-055, dated December 2014 <br /> Dear Mr. Timmons: <br /> As requested, Earth Solutions NW, LLC (ESNW) has prepared this letter providing an infiltration <br /> and low impact development evaluation for the proposed project in accordance with the <br /> referenced stormwater manual. ESNW prepared the referenced geotechnical engineering <br /> study for the proposed project; the infiltration and low impact development evaluation provided111 <br /> in this letter should be considered as an amendment to the discussion provided in the <br /> referenced geotechnical engineering study. <br /> Infiltration Feasibility <br /> The unweathered glacial till soil deposits observed at relatively shallow depths generally exhibit <br /> very poor soil infiltration characteristics. Additionally, the sloped topography of the site and <br /> surrounding area is not conducive to implementing infiltration. Based on the sloped topography <br /> and soil conditions, we do not recommend utilizing infiltration systems for the proposed <br /> development. Additionally, the very poor infiltration characteristics of the shallow unweathered <br /> glacial till soil across the previously cleared sloped topography of the site may be exacerbating <br /> the existing stormwater runoff issues noted by adjacent property owners. <br /> 1805 - 136th Place N.E., Suite 201 • Bellevue, WA 98005 • (425)449-4704 • FAX(425)449-4711 <br />