4730 COLBY AVE SEPA 016 - 027 - YMCA Geotech Report 2025-04-14

r October 25, 2015 YMCA - Everett L&A Job No. 15-089 Page 2 be demolished and a new multi-use building is to be constructed roughly over the footprint of the existing buildings. We understand the new building will be an above-grade structure to be supported on perimeter concrete foundations and interior bearing walls, beams, and columns. The area south of the proposed building, currently covered by lawn grass, is to be developed into a ball park. The area north of the proposed building, also currently covered by lawn grass, is to be converted into a paved parking lot. A detention/infiltration pond is to be constructed at the northwest corner of the site for onsite stormwater disposal. SCOPE OF SERVICES The scope of services of this study comprises specifically the following: 1. Review geologic and soil conditions at and in the vicinity of the subject property based on a published geologic map. 2. Explore subsurface conditions of the project site with test pits to depths where a firm bearing and/or infiltratable soil stratum is encountered or to the maximum depth (about 12 feet) capable by the backhoe used in test pit excavation, whichever occurs first. 3. Conduct Soil Particle Size Distribution Test in laboratory on soil samples obtained from infiltratable soil layer(s) if encountered by test pits, and analyze test results to determine soil infiltration rates in accordance with the procedure outlined in 2012 Stormwater Management Manual for Western Washington, published by Washington State Department of Ecology. 4. Perform geotechnical engineering analysis based on soil data obtained from test pits. 5. Prepare a written report to present our findings, conclusions, and geotechnical recommendations. LIU & ASSOCIATES, INC.