1515 132ND ST SE Geotech Report 2022-10-25

RELATIVE DENSITY / CONSISTENCY SAND /GRAVEL SILT / CLAY Density SPT Approx. Relative Consistency SPT Approx. Undrained Shear N-values Density (°/,) N-values Strength (psf) Very Loose ut <15 Very Soft <2 <250 Loose 4 to 10 15.35 Soft 2 to 4 250.500 Med. Dense 10 to 30 35 - 65 Med. Stiff 4 to 8 500.1000 Dense 30 to 50 65 - 85 Stiff 8 to 15 1000.2000 VeryDense >50 85.100 : Very Stiff 15 to 30 2000 - 4000 Hard >30 >4000 UNIFIED SOIL CLASSIFICATION SYSTEM MAJOR DIVISIONS GROUP DESCRIPTIONS •� GW: Well -graded GRAVEL Gravel GRAVEL (<5%fines) ............................................................ 500/6 or more of the coarse o� GP Poorly -graded GRAVEL (racoon retained on the 94 sieve. Use dual symbols (eg. ...................... o ............................................................ GM Silty GRAVEL GP -GM) for 5%to 121/6 fines. ...................................................................... GRAVEL (>121/6 fines) • • • • • • • • • • • • .............................. • GC : Clayey GRAVEL .............................................................. SW: Well -graded SAND Sand ; SAND (<5%fines) 50% or more of the coarse �, SP : Poorly -graded SAND fraction passing the #4 sieve. Use dual symbols (eg. SP•SM ) ; .................................. .......................................................... SM: Silty SAND for s%to12%fines. ...................................................................... : SAND(>12%fines) .....:...................................................... SC : Clayey SAND ......................................................... : ML : SILT Liquid Limit < 50 .....:...................................................... CL : Lean CLAY ............................................................ Sift and Clay -- == _ OL :Organic SILT or CLAY 50%or more passing #200 sieve ?.................................. ......................................................... MH : Elastic SILT . Liquid Limit > 50 ............................................................ CH : Fat CLAY ............................................ : ............................................................ OH : Organic SILT or CLAY :. In , I ......................... Highly Organic Soils ------ ......................................... .......... ... PT: PEAT Notes: 1. Soil exploration I s contain material descriptions based on visual observation and field tests using a system modified from the Un�omt Soil Classification System (USCS). Where necessary laboratory tests have been 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 Iogs. 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 andlor Fissured: Breaks along defined planes composition from material units above and below Slickensided: Fracture planes that are polished or glossy Laminated: Layers of soil typically 0.05 to 1 mm thick, max.1 cm Blocky: Angular soil lumps that resist breakdown Lens: Layer of soil that pinches out laterally Disrupted: Soil that is broken and mixed Intedayered: 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 Homogeneous: Soil with uniform color and composition throughout BCN: Angle between bedding plane and a plane normal to core axis COMPONENT DEFINITIONS COMPONENT SIZE / SIEVE RANGE COMPONENT SIZE / SIEVE RANGE Boulder: > 12 inches Sand Cobbles: 3 to 12 inches Coarse Sand: #4 to #10 sieve (4.5 to 2.0 mm) Gravel Medium Sand: #10 to #40 sieve (2.0 to 0.42 mm) Coarse Gravel: 3 to 314 inches Fine Sand: #40 to #200 sieve (0.42 to 0.074 mm) Fine Gravel: 314 inches to #4 sieve Sift 0.074 to 0.002 mm Clay <0.002 mm AGE® Terms and Symbols for r N C 0 R P 0 R A T E D Boring and Test Pit Logs TEST SYMBOLS for In Situ and Laboratory Tests listed in "Other Tests" column. ATT Atterberg Limit Test Comp Compaction Tests Con Consolidation DD Dry Density DS Direct Shear %F Fines Content GS Grain Size Perm Permeability PP Pocket Penetrometer R R-value SG Specific Gravity TV Torvane TXC Triaxial Compression UCC Unconfined Compression SYMBOLS SampleM Situ test types and intervals ®2-inch OD Split Spoon, SPT (1404b. hammer, 30" drop) H3.25-inch OD Spilt Spoon (3004b hammer, 30" drop) Non-standard penetration test (see boring log for details) Thin wall (Shelby) tube Grab Rock core ® Vane Shear MONITORING WELL SZ Groundwater Level at time of drilling (ATD) t Static Groundwater Level Cement I Concrete Seal Bentonite grout I seal Silica sand backfill Slotted tip Ktd Slough Bottom of Boring MOISTURE CONTENT Dry Dusty, dry to the touch Moist Damp but no visible water Wet Visible free water Figure A-1