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GEOENGINEERS� <br />17425 NE Union Hill Road, Suite 250 <br />Redmond, Washington 98052 <br />425.861.6000 <br />April 22, 2020 <br />Everett Housing Authority <br />2107 Colby Avenue <br />' <br />Everett, Washington 98201 <br />' Attention: Maxwell Figarsky <br />Subject: Addendum Letter No. 1 <br />' Site 1- Pilot Infiltration Testing <br />Baker Heights Redevelopment <br />Everett, Washington <br />File No. 21288-002-00 <br />INTRODUCTION <br />' This addendum letter summarizes the results of pilot infiltration tests (PITs) completed at two proposed <br />infiltration facility locations on Site 1 of the Baker Heights Redevelopment project located in <br />Everett, Washington. The conceptual buildings, infiltration areas and other site improvements are shown <br />on Figure 1. <br />' Two small-scale PITs were conducted at the infiltration areas as requested by KPFF Consulting Engineers <br />(KPFF) and the Everett Housing Authority (EHA) based on the conceptual site plan for the project. The <br />tests were conducted following the guidelines provided in the Washington State Department of <br />' Ecology's (Ecology) 2014 Stormwater Management Manual of Western Washington (2014 SWMMWW). <br />GeoEngineers, Inc. (GeoEngineers) previously issued a geotechnical report for the Baker Heights <br />Redevelopment project titled "Geotechnical Engineering Services, Everett Housing Authority, Baker Heights <br />Redevelopment, Everett, Washington," dated October 30, 2019. This letter is submitted as Addendum <br />No. 1 to our October 30, 2019 report. <br />IPROJECT DESCRIPTION <br />We understand that EHA is interested in the feasibility of stormwater infiltration for the Baker Heights <br />Redevelopment project and also in determining preliminary soil infiltration rates for proposed infiltration <br />facilities. Infiltration facilities, if feasible, are being considered at Sites 1 and 2. Areas being considered <br />' within Site 1 are located in the center of the site as shown on Figure 1. Site 2 infiltration locations have not <br />been determined at this time and were not evaluated at this stage of the project. The bottom of the <br />proposed infiltration facilities on Site 1 will be approximately 5 to 6 feet below the existing ground surface <br />' at each location. <br />