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GWENGINEERS� <br />17425 NE Union Hill Road, Suite 250 <br />Redmond, Washington 98052 <br />425.861.6000 <br />March 31, 2022 <br />LMJ Enterprises, LP <br />11845 NE 85th Street <br />Everett, Washington 98033 <br />Attention: Tod Johnson <br />Subject: Pilot Infiltration Testing (Addendum No. 1) <br />Lee Johnson Hyundai Dealership <br />7800 Evergreen Way <br />Everett, Washington <br />File No. 24459-003-00 <br />This addendum letter summarizes the results of pilot infiltration tests (PITs) completed at two potential <br />infiltration facility locations that are being planned as part of the proposed improvements to the existing <br />Lee Johnson Hyundai Dealership located at 7800 Evergreen Way in Everett, Washington. The proposed <br />building addition and infiltration test areas are shown on Figure 1. <br />Two small-scale PITs (PIT-1 and PIT-2) were conducted at proposed infiltration areas as requested by <br />Freheit Architecture and KPFFConsulting Engineers (KPFF) (civil engineer) based on the proposed site plan <br />and planned infiltration facilities. The tests were conducted following the guidelines provided in the <br />Washington State Department of Ecology's (Ecology) 2019 Stormwater Management Manual for Western <br />Washington (2019 SWMMWW). GeoEngineers, Inc. (GeoEngineers) previously issued a geotechnical report <br />for the 7800 Evergreen Way improvement project titled "Geotechnical Engineering Services, Lee Johnson <br />Dealership Improvements, 7800 Evergreen Way, Everett Washington," dated December6, 2021. This letter <br />is submitted as an Addendum No. 1 to our December 6, 2021 report. <br />1 :2:i031 X631 <br />We understand that LMJ Enterprises is interested in the feasibility of stormwater infiltration for the <br />7800 Evergreen Way project and also in determining preliminary long-term soil infiltration rates for the <br />proposed infiltration facilities. Infiltration facilities, iffeasible, are being considered atthe locations of PIT-1 <br />and PIT-2, shown on Figure 1. The bottom of the proposed infiltration facilities will be approximately 5 feet <br />below the existing ground surface at PIT-1 and approximately 4 feet below the existing ground surface <br />at PIT-2. <br />