3800 RIVERFRONT BLVD Geotech Report 2023-05-04

DRILLING COMPANY: Holocene Drilling DATE STARTED: 11/6/2018 DRILLING METHOD: CME 830 Tracked Rig,HSA&Mud Rotary DATE COMPLETED: 11/6/2018 SAMPLING METHOD: SPT with Autohammer LOGGED BY: B.Thurber LOCATION: See Figure 2 SURFACE ELEVATION: 31.0 t feet w u w vtY Standard Penetration Test m Z w U a ? < t co Q (140 lb.weight,30"drop) Z J O •w w e ♦ Blows per foot O (0 J J Z Q t/1 ,� 0 . a s Q: 3 w 8 >^I . Q. >- ai Q ¢ w2 � y 30 U) DESCRIPTION U) U) a 0 0 0 10 20 30 40 50 w'" — "Very loose",REFUSE:Plastic,aluminum,styrofoam,wood ® S-7 8-1-2 A - fragments,fabric,paper.Poor recovery,no soil.-20% — 0 rottable. Thin black slurry. 35— "Medium dense",REFUSE:drove into wood(-3"in shoe)with ® S-8 16-7-6 A - fabric,aluminum cans,plastics.-10%gray SILT. —-5 _ `�' PT Medium stiff,dark reddish brown,fibrous PEAT,moist. _ L, 0 i, (ALLUVIUM) 0- /, , Switched to mud rotary at 40 ft. `/ S-9 3-3-4 - -10 . A ML Medium stiff,olive gray,slightly fine sandy,SILT,moist.With -- lenses of partly decomposed wood and peat fibers. — - NR _ 1 45— Poor recovery;Refuse carrydown.Residual gray SILT in A NR 2-2-3 - sampler shoe. — -15 50— No recovery ® NR 4-3-4 - — -20 SP 55— . Dense,gray,dean,fine to medium SAND,wet. S-10 14-13-19 (ADVANCE OUTWASH) — -25 I 60 — A — 0 20 40 60 80 100 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. J BORING: I GM GEOTECHNICAL ENGINEERING REPORT B BORING: RIVERFRONT BOULEVARD HWAGEOSCIENICESINC. EVERETT, WASHINGTON PAGE: 2 of 3 I PROJECT NO.: 2015-061 FIGURE: A-2 BORING-DSM 2015-061.GPJ 12/10/18