3800 RIVERFRONT BLVD Geotech Report 2023-05-04

I DRILLING COMPANY: Holocene Drilling DATE STARTED: 11/7/2018 1 DRILLING METHOD: Dietrich D-50 Turbo,HSA&Mud Rotary DATE COMPLETED: 11/7/2018 SAMPLING METHOD: SPT with Autohammer LOGGED BY: A.Ong LOCATION: See Figure 2 SURFACE ELEVATION: 36.0 ±feet w N w U cc Standard Penetration Test m Z w U a ? t Q (140 lb.weight,30"drop) Z J O w w. Blows per foot O (n J J to Ce Z 1-� m 0 a d Z•3 w = >^III . wcu >- UUn Q Q Z ° ~ � �' o U) DESCRIPTION U N a 1 0 O 0 10 20 30 40A 50 w Dense,dark gray,slightly gravelly,slightly silty,fine to coarse [S-11 18-18-22 - SAND,wet. Gravel lag from higher in borehole shows oil —-25 sheen. (ADVANCE OUTWASH) •'. SP A - 65— Dense to very dense,dark gray,dean,medium to coarse 17-21-23 - SAND,wet.Scattered fine gravel.Gravel lag from higher in XS-12 — -30 borehole shows oil sheen. _ r I 70— »A- Very dense,dark gray,dean medium to coarse SAND,wet. S-13 20-28-34 - Scattered subrounded-subangular fine gravel. — -35 I I »A- ML \Very dense,dark gray,dean,medium to coarse SAND,wet. i -14A 20-33-46 - Hard,brown SILT,moist.Thinly bedded with trace of fine S-14B — -40 _ sand. _ I Below 76.2':Hard,gray SILT,moist.Nonplastic and thinly _ bedded/laminated with trace wood,moist. _ Borehole terminated at 76.5'below ground surface(bgs). - I _ Groundwater encountered at 30'bgs during drilling. _ 80 Borehole abandoned with 3/8"bentonite chips. - - -45 85— - --50 90— 0 20 40 60 80 100 II Water Content(%) Plastic Limit I • I Liquid Limit NOTE: This log of subsurface conditions applies only at the specified location and on the date indicated Natural Water Content and therefore may not necessarily be indicative of other times and/or locations. BORING: I IT GEOTECHNICAL ENGINEERING REPORT B BORING: RIVERFRONT BOULEVARD -43 HWAGEOSCIENCES INC. EVERETT, WASHINGTON PAGE: 3 of 3 I PROJECT NO.: 2015-061 FIGURE: A-9 BORING-DSM 2015-061.GPJ 12/10/18