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' • I <br /> Subsurface Ezploration and i <br /> 2026 Grand Avenue Geotechnical Engirseenng Report , <br /> Everett. R'ashin yton Proiect and Sire Canditions i <br /> I <br /> Disturbed but representative samples were obtained by using the Standard Peneuation Test <br /> procedure in accordance with ASTM:D 1586. This test and sampling method consists of <br /> driving a standard 2-inch outside-diameter, spiit-barrel sampler a distance of 18 inches into the <br /> soil with a 140-pound hammer that free falls a distance of 30 inches. The number of blows for <br /> each 6-inch interval is recorded, and the number of blows requ;red to drive the sampler the <br /> final 12 inches is known as the 3tandard Penetration Resistance ("N") or blow count. If a total <br /> of 50 blows are recorded within one 6-inch interval, the blow count is recorded as 50 blows <br /> for the number of inches of penetration. The resistance, or N-value, provides a measure of the <br /> relative densiry of granular soils or the relative consistency of cohesive soils; these values are <br /> plotted on the anached boring logs. <br /> The samples obtained from the split-barrel sampler were classified in the field and <br /> representa[ive portions pl�ced in �vatertieht containers. The samples were then transported ro <br /> our laburatorv for further visual classi(ication an� laboratory restin�, as necessary. <br /> 4.0 SUI3SURFACE COtiDITIO�S <br /> Subsurface conditions un the site were inferred from the field explorations accomplished for <br /> this study, visual reconnaissance of the site, and review of applicable geologic literature. As <br /> shown on the field logs, die exploration holes generally encountered loose fill soils overlying <br /> natural, glacially consolidated deposits (Vsshon advance outwash - Esperance sand). The <br /> following section presents more detailed subsurface information or�anized from the shallowest <br /> (youngest) to the deepest (oldest) sedimcnt types. <br /> d.l Strati�raphy <br /> I ill Soils <br /> Loose fill soils were encountered in all dvee exploration borings. The depdi of fill was <br /> observed at about 3 feet in LB-2, and 6 feet in EB-3 and EB-1. The fill generally consisted of <br /> loose, moist brown to black, fine to medium sand with varyine amounts of silt. In EB-1, metal <br /> fragments were observed within die fill soils. Due to their louse consistency and variabiliry, <br /> these soils are not considered suitable for structural suppurt. <br /> Vnshon �Idvance Ounvash - Espernnce Sand <br /> (;laciallv consolidated sediments �vere encountered in all the explorations. The sediments <br /> �onsisted of loose grading to dense, moist, brown, fine to medium sand �vith varying amounts" <br /> ��f gravel. lVithin EB-2 and EI3-3, medium dense Esperance sand sediments were encountered <br /> at a d�pth of approxima[ely 10 fzet belo�� existing site erade. �Vithin EB-1, medium dense <br /> �and sediments were encountered at a depth of 15 feet. These sediments were inrerpreted as <br /> I:sperance sand sediments, and were deposited prior to the advancing Vashon glacial ice sheet. <br /> �"»e �9' Z000 EXH I I3I T �#nt v` ��SSOC(ATED EARTN SCIENCES, /NC. <br /> JVS-J.�-KEWII9GI -L7�Diaa�b��- �S:.K Page 3 <br /> PAGE�SJF r5 <br />