10312 EVERGREEN WAY SONIC Geotech Report 2023-05-25

Geotechnical Engineering Report 8 January 8,2021 Glint Car Wash and Sonic Everett,Everett,Washington RGI Project No.2020-643-1 Table 2 Structural Fill Gradation U.S.Sieve Size Percent Passing 4 inches 100 3/4 inch 70 minimum No. 4 35 to 60 No. 200 0 to 5* *Based on minus 3/4 inch fraction. Prior to use, a RGI representative should observe and test all materials imported to the site for use as structural fill. Structural fill materials should be placed in uniform loose layers not exceeding 12 inches and compacted as specified in Table 3.The soil's maximum density and optimum moisture should be determined by ASTM D1557. Table 3 Structural Fill Compaction ASTM D1557 Minimum Moisture Content Location Material Type Compaction Range Percentage Foundations On-site granular or approved 95 +2 -2 imported fill soils Retaining Wall Backfill • On-site granular or approved 92 +2 -2 imported fill soils Slab-on-grade On-site granular or approved 95 +2 -2 imported fill soils General Fill (non- On-site granular or approved 90 • +3 -2 structural areas) imported fill soils Pavement, Subgrade On-site granular or approved 95 +2 -2 and Base Course imported fill soils Placement and compaction of structural fill should be observed by RGI. A representative number of in-place density tests should be performed as the fill is being placed to confirm that the recommended level of compaction is achieved. 5.3 FOUNDATIONS The proposed building foundations should be supported on 18 inches of structural fill. Perimeter foundations exposed to weather should be at a minimum depth of 18 inches below final exterior grades. Interior foundations can be constructed at any convenient depth below the floor slab. Finished grade is defined as the lowest adjacent grade within Corporate Office 17522 Bothell Way Northeast Bothell,Washington 98011 Phone 425.415.0551• Fax 425.415.0311 14 -14w.rilev-group.com