607 RIVERSIDE RD Geotech Report 2022-10-25 (2)

I II TERRA ASSOCIATES, Inc. Consultants in Geotechnical Engineering, Geology I and Environmental Earth Sciences I March 22,2016 Project No.T-7388 I Mr. Donnie Belk Panattoni Development Company, Inc. 900 Southwest 16th Street, Suite 330 Renton,Washington 98057 ISubject: Geotechnical Report Riverside Business Park—Lots 5 and 6 I Riverside Road Everett,Washington IDear Mr.Belk: As requested, we have conducted a geotechnical engineering study for the subject project. The attached report presents our findings and recommendations for the geotechnical aspects of project design and construction. ISoil conditions observed in the test pits and CPTs at the site consist of 4.5 feet to 8.5 feet of fill overlying native alluvial soils. The alluvial soils consist of sands underlain by a 10-to 12-foot thick layer of soft, compressible I silt and clay that is in turn underlain by medium dense to dense sands. Groundwater was encountered at depths ranging from 5 feet to 12.8 feet. I In our opinion, soil and groundwater conditions at the site will be suitable for support of the development as planned provided recommendations contained herein are incorporated into project design and construction specifications. Site preparation to mitigate potential building settlements due to consolidation of the organic silt Ilayer consists of ground improvement by surcharging the building pad area. We trust the information provided in the attached report is sufficient for your current needs. If you have any Iquestions or need additional information, please call. Sincerely yours, TERRA ASSOCIATES,INC. INFT 1 Kevin P.Roberts,P.E. IGeotechnical Engineer ITheodore J. Schepper,P.E. President I 12220 113th Avenue NE,Ste. 130, Kirkland,Washington 98034 IPhone(425)821-7777 • Fax(425) 821-4334