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DRAFT MEMORANDUM <br />Project No. NWG0131-01 <br />September 26, 2025 <br />To: Dan Ireland, PE, SCJ Alliance <br />From: <br />Nicholas C. Szot, PE <br />Principal Geotechnical Engineer <br />nick.szot@geosyntec.com <br />J. Bodie McCosby, LG <br />Project Professional Geologist <br />j.bodie.mccosby@geosyntec.com <br />Re: Geotechnical and Environmental Engineering Memorandum <br />Cle Elum Transfer Station Wastewater Storage Tank <br />50 Number 5 Mine Road Cle Elum, Washington <br />This memorandum presents Geosyntec Consultants’ (Geosyntec) field investigation results and <br />environmental and geotechnical engineering recommendations to support the replacement of a <br />wastewater underground storage tank (UST) with a new 5,000 gallon, 8-foot diameter, 16-foot long <br />UST at the Cle Elum Transfer Station (Project). The Project is located at 50 Number 5 Mine Road, <br />Cle Elum, Washington (Site; Figures 1 and 2). We understand that the planned new UST will <br />replace an existing, deficient UST at the approximate northeast corner of the Site. <br />Our scope of work for the Project consisted of test pit explorations at the Site, and our work was <br />completed in general accordance with our proposal No. NCP2025-214, dated September 16, 2025. <br />Site Conditions <br />Site surface and subsurface conditions, inferred from our review of geologic maps and observed <br />during our field investigation, are described below. <br />Surface Conditions <br />The ground surface at the 11-acre Site is developed with a transfer station building and associated <br />infrastructure. The Site is mostly gravel covered with internal pockets and a perimeter of tall <br />coniferous trees. The Site is bordered by Washington State Route 903 to the southwest, Kittitas <br />County Public Works buildings to the northwest, Crystal Creek and Coal Mines Trail to the <br />northeast, and an undeveloped parcel to the southeast (Figure 2). <br />PRELIMINARY <br />9/26/2025 <br />ear t h +w ate r <br />Aspect Consulting 801 5th Avenue Suite 2200 Seattle, WA 98104 206.328.7443 www.aspectconsulting.com