3535 RIVERFRONT BLVD Geotech Report 2023-02-22

I 'DRILLING COMPANY: Holocene Drilling LOCATION: Three-Acre Park 1 DRILLING METHOD: HSA,CME 850 tracked rig DATE STARTED: 6/28/2010 SAMPLING METHOD: SPT w/Autohammer DATE COMPLETED: 6/28/2010 ISURFACE ELEVATION: 13.00*feet LOGGED BY: P.Pearson w w v re Standard Penetration Test I m z� w U a- 2 2 1- Q (140 lb.weight,30"drop) J O w w w. itEl z ♦Blows per foot i a�, 03 2 Cl) 2 2 z 6 = O ay I L8 4 r U DESCRIPTION U CS a O O 0 10 20 30 40 50 0" 30— • SP Medium dense,dark gray,slightly silty,poorly graded fine to S-6 5-6-12 GS • : A: : : : —30 ▪ SM medium SAND,wet. Possible heave. ...;... . . ........ - ` Driller encountering heave,using bentonite mud to control. 35— •';• ,. SP Loose,dark gray,slightly silty,poorly graded fine to medium S-7 5-4-4 GS —35 _ •.`.•, SM SAND,wet,with large chunk of wood debris. - t▪ i. 40— • Grading to medium dense. Wood debris noted. S-8 8-10-13 %F • ! A —40 I 45— ••:•t: N S-9 3-5-12 • A —45 Organic silt pocket noted at 46 feet bgs. Driller notes heave,losing mud to ground water flow toward river. - Grading to dense. Trace organics noted. S-10 7-12-18 %F 55— • SP Medium dense,dark gray,clean poorly graded fine to S-11 5-6-14 GS • • •• —55 • medium SAND,wet. Some heave in sample. - 60— —60 For a proper understanding of the nature of subsurface conditions,this 0 20 40 60 80 100 exploration log should be read in conjunction with the text of the Water Content(%) geotechnical report. NOTE: his log of subsurface conditions applies only at the specified location and on the date indicated Plastic Limit I 0---1 Natural Water Content Liquid Limit and therefore may not necessarily be indicative of other times and/or locations. I PUBLIC AMENITIES BORING:MI'El RIVERFRONT DEVELOPMENT HWAGEOSCIENcE$NC EVERETT, WASHINGTON PAGE: 2 of 3 PROJECT NO.: 20 1 5-06 1 FIGURE: A-2 BORING 2007-087.GPJ 6/26/12