Laserfiche WebLink
� Si�bsurface Erplarati�u and <br /> 2026 Grnnd Avenue Geotechnical Engineering Report <br /> � Evereu lVnshine�on Pralecr and Site Canditions <br /> � Disturbed but representative samples were obtained by using the Standard Penetration Test <br /> procedure in accordance with ASTb1:D 1586. This test and sampling method consists of <br /> driving a stand:ud 2-inch outside-diameter, split-barrel sampler a distance of 18 inches inro the <br /> ( soii 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 required to drive the sampler the <br /> final 12 inches is known as the Standard 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. Tlie resistance, or N-value, provides a measure of the <br /> relative densiry of granular soils or the relative consistency of cohesive soils; these vatues are <br /> � plotted on the attached boring laes. <br /> The samples obtained from the split-barrcl saaipler were classified in the field and <br /> � representativc portions placed in �vatertight containers. The samples were then transported to <br /> our laburatory for (urther visual dassitication and laboratory testing, as nec�ssary. <br /> � � d.0 SUBSURPACE CONDITIONS <br /> ( Subsurface conditions on thc site were inl'erred from the field esplorations accomplished for <br /> this smdy, visual reconnaissance of the site, and review of applicable geoloeic lirerature. As <br /> � . S�iOCv7 Oi� IiiC 1C2(i i0'S'-S. 1�:C 8KO�C::1ll0II �lL'I�S d�::�r�yll�, enceuntered I„��P tj�� C(11�$ (1VP,i�V1f1E <br /> namral, glacially consolidated deposits (Vashon advance ouavash - Esperance sand). The <br /> foliowing section presents more detailed subsurt'ace information organized from die shallo�vest <br /> I (youngest) to thc d�epest (oldest) sediment types. <br /> �3.1 Stratigraphy <br /> I Fif! Soila <br /> � Loose lill soils wcre encountered in ali threc exploration borines. Tl�e depdi of fill was <br /> observed at about 3 fect in EB-Z, and 6 feet in L•D-3 and GB-1. The fill generally consisred of <br /> r loose, moist bro�vn to black, fine to medium sand with varying amounts of silt. In EF3-1, metal <br /> + fragments were obs�rved within the till suils. Due to eheir loose consistency and variabiliry, <br /> diese soils are not considered suitable for structural support. <br /> � Vn.rhon Aclti�unce Otuicaslt - Espernnce S�ntd <br /> I Glacialiy consolidated sediments �verc encountered in �ll the esplorations. The sediments <br /> cunsisted of loose gradine to dense, moist, brown, fine to medium sand with varying amounts <br /> of gravel. R'ithin L'B-2 and LI3-3, mediunt dense Esperance sand sediments were encounrered <br /> S at a depth of approximately 10 f'eet below csisting sitc erade. �Vithin EB-i, medium dense <br /> � sand scdiments were encauntered at a depUi oP 15 feet. These sediments were interpreted as <br /> Csperance sand sediments, and wcre deposited prior to the advancing Vashon glacial ice sheet. <br /> I - <br /> ������ �g �ppp :ISSOCIATEDE.IRTHSCIF.NCES, IA:C. <br /> � i,cs e�� xex„rv�;i-u>n,�:��.��- ua Page 3 <br />