1020 N BROADWAY EVCC STUDENT HOUSING Geotech Report 2022-10-25

RELATIVE DENSITY/CONSISTENCY TEST SYMBOLS for In Situ and Laboratory Tests SAND/GRAVEL SILT/CLAY listed in"Other Tests"column. SPT Approx.Relative SPT Approx.Undrained Shear AU AtterbergLimit Test Density N-values Density(%) Consistency N-values Strength(psf) 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 GW Well-graded GRAVEL TV Torvane Gravel GRAVEL(<5%fines) t b•'Q TXC Triaxial Compression 50%or more of the coarse ob C GP Poorly-graded GRAVEL fraction retained on the#4 GM Silty GRAVEL UCC Unconfined Compression sieve.Use dual symbols(eg. GP-GM)for 5%to 12%fines. GRAVEL(>12%fines) •,, GC Clayey GRAVEL SYMBOLS Sample/In Situ test types and intervals SW i Well-graded SAND Sand SAND(<5%fines) 2-inch OD Split Spoon,SPT 50%or more of the coarse SP Poorly-graded SAND (140-lb.hammer,30"drop) fraction passing the#4 sieve. Use dual symbols(eg.SP-SM) • SM: Silty SAND for 5%to 12%fines. SAND(>12%fines) H 3.25-inch OD Spilt Spoon SC : Clayey SAND (300-lb hammer,30"drop) ML: SILT Liquid Limit<50 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 1111 MH: Elastic SILT Thin wall(Shelby)tube Liquid Limit>50 CH i Fat CLAY , OH: Organic SILT or CLAY Grab Highly Organic Soils k u. PT : PEAT 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 H Rock core conducted(as noted in the"Other Tests"column),unit descnptions 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 indusive of all symbols that may appear on the borehole logs. 571 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 SZ Groundwater Level at Laminated: Layers of soil typically 0.05 to 1mm thick,max.1 cm time of drilling(ATD) Blocky: Angular soil lumps that resist breakdown 1 Static Groundwater Level Lens: Layer of soil that pinches out laterally Disrupted: Soil that is broken and mixed Cement/Concrete Seal Intertayered: 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 eenite 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 a COMPONENT SIZE/SIEVE RANGE COMPONENT SIZE/SIEVE RANGE '` Slough Boulder: >12 inches Sand Bottom of Boring o Cobbles: 3 to 12 inches Coarse Sand: #4 to#10 sieve(4.5 to 2.0 mm) MOISTURE CONTENT 0 Gravel Medium Sand: #10 to#40 sieve(2.0 to 0.42 mm) Dry Dusty,dry to the touch w 0 aMCoarse Gravel: 3 to 3/4 inches Fine Sand: #40 to#200 sieve(0.42 to 0.074 mm oist Damp but no visible water a 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 0 J m ,t,_.1' ] iri1IEE Terms and Symbols for INCORPORATED Boring and Test Pit Logs Figure A-1 09 Phone: 206.262.0370