11229 19TH AVE SE SILVER LAKE TOWNHOMES WHOLE SITE Geotech Report 2022-10-25

• RELATIVE DENSITY/CONSISTENCY TEST SYMBOLS SAND/GRAVEL . SILT In Situ and Laboratory Tests SILT/CLAY listed in"Other Tests"column. Density SPT Approx.Relative SPT Approx.Undrained Shear AU Atterberg Density(%) Consistency N-values Strength(psf) g Limit Test Comp Compaction Tests Very Loose <4 <15 Very Soft <2 <250 Con Consolidation Loose 4 to 10 15.35 Soft 2 to 4 250-500 DD Dry Density Med.Dense 10 to 30 35.65 Med.Stiff 4 to 8 500-1000 DS Direct Shear Dense 30 to 50 65.85 Stiff 8 to 15 1000-2000 %F Fines Content Very Dense >50 85-100 Very Stiff 15 to 30 2000.4000 GS Grain Size Hard >30 >4000 Perm Permeability PP Pocket Penetrometer UNIFIED SOIL CLASSIFICATION SYSTEM R R-value MAJOR DIVISIONS GROUP DESCRIPTIONS SG Specific Gravity Gravel GRAVEL(<5%fines) �� GW Well-graded GRAVEL TV Torvane �'' GP Poorly-gradedTXC Triaxial Compression 50%or more of the coarse i,oC GRAVEL fraction retained on the#4 UCC Unconfined Compression P . GM Si GRAVEL GP-GM)f12%fio dual symbols(eg. r SYMBOLS for 5%to nes. GRAVEL(>12%fines) GC Clayey GRAVEL SW Well-graded SAND Samplelln Situ test types and intervals in:Sand SAND(<5%fines) ""• X 2-inch OD Split Spoon,SPT 50%or more of the coarse .`e SP Poorly-graded SAND /J�\ (140-Ib.hammer,30"drop) fraction passing the#4 sieve. SM Silty SAND Use dual symbols(eg.SP-SM) SAND for 5%to 12%fines. (>12%fines) SC Clayey SAND 3.25-inch OD Spilt Spoon 111 ML SILT (300-lb hammer,30"drop) Liquid Limit<50 A CL Lean CLAY Non-standard penetration Silt and Clay __= OL Organic SILT or CLAY test(see boring log for details) 50%or more passing#200 sieve MH Elastic SILT Thin wall(Shelby)tube Liquid Limit>50 'ice CH Fat CLAY OH Organic SILT or CLAY ft Grab Highly Organic Soils , 1 , , PT PEAT V Notes: 1. Soil exploration logs contain material descriptions based on visual observation and field tests using a system modified from the Uniform Soil Classification System(USCS).Where necessary laboratory tests have been Rock core conducted(as noted in the"Other Tests"column),unit descriptions may include a classification.Please refer to the discussions in the report text for a more complete description of the subsurface conditions. 2. The graphic symbols given above are not inclusive of all symbols that may appear on the borehole logs. v-'-' Vane Shear Other symbols may be used where field observations indicated mixed soil constituents or dual constituent materials. DESCRIPTIONS OF SOIL STRUCTURES Layered: Units of material distinguished by color and/or Fissured: Breaks along defined planes MONITORING WELL composition from material units above and below Slickensided: Fracture planes that are polished or glossy a Groundwater Level at Laminated: Layers of soil typically 0.05 to 1mm thick,max.1 cm Block),; Angular soil lumps that resist breakdown time of drilling(ATD) Lens: Layer of soil that pinches out laterally 1 Static Groundwater Level Disrupted: Soil that is broken and mixed Cement/Concrete Seal Interlayered: Alternating layers of differing soil material Scattered: Less than one per foot Pocket: Erratic,discontinuous deposit of limited extent Numerous: More than one per foot Bentonite grout!seal Homogeneous: Soil with uniform color and composition throughout BCN: Angle between bedding plane and a plane Silica sand backfill normal to core axis COMPONENT DEFINITIONS Slotted tip COMPONENT SIZE/SIEVE RANGE COMPONENT SIZE/SIEVE RANGE Slough F- Boulder: >12 inches Sand Bottom of Boring O MOISTURE CONTENT d Cobbles: 3 to 12 inches Coarse Sand: #4 to#10 sieve(4.5 to 2.0 mm) 0 Gravel Medium Sand: #10 to#40 sieve(2.0 to 0.42 mm) Dry Dusty,dry to the touch z a Coarse Gravel: 3 to 3/4 inches Fine Sand: #40 to#200 sieve(0.42 to 0.074 mm) Moist Damp but no visible water 0_ Fine Gravel: 3/4 inches to#4 sieve Silt 0.074 to 0.002 mm Wet Visible free water 0 Clay <0.002 mm 0 J W 1riIEE Terms and Symbols for • I N C O R P O R A T E D Boring and Test Pit Logs Figure A-1 2 Phone: 206.262.0370