5010 DOVER ST Geotech Report 2025-07-31

SOIL CLASSIFICATION & PENETRATION TEST DATA EXPLANATION UNIFIED SOIL CLASSIFICATION SYSTEM (USCS) MAJOR DIVISION GROUP TYPICAL DESCRIPTION LABORATORY CLASSIFICATION CRITERIA SYMBOL WELL GRADED GRAVELS,GRAVEL-SAND Cu=(D60/010)greater than 4 CLEAN GRAVELS GW MIXTURE,LITTLE OR NO FINES CONTENT Cc=(D30)2 I(D10•D60)between 1 and 3 OF FINES BELOW • GRAVELS (little or no GP POORLY GRADED GRAVELS,AND GRAVEL-SAND 5% CLEAN GRAVELS NOT MEETING ABOVE COARSE- (More Than Half fines) MIXTURES LITTLE OR NO FINES REQUIREMENTS GRAINED SOILS Coarse Fraction is Larger Than No.4 GM:ATTERBERG LIMITS BELOW"A"LINE. Sieve) DIRTY GM SILTY GRAVELS,GRAVEL-SAND-SILT MIXTURES CONTENT or P.I.LESS THAN 4 GRAVELS OF FINES EXCEEDS (with some GC CLAYEY GRAVELS,GRAVEL-SAND-CLAY 12% GC:ATTERBERG LIMITS ABOVE"A"LINE. fines) MIXTURES or P.I.MORE THAN 7 SANDS CLEAN SW LITTLE GRADED SANDS,GRAVELLY SANDS, Cu=(D60/D10)greater than 6 LITTLE OR NO FINES CONTENT Cc=(D30)2/(D10•D60)between 1 and 3 SANDS (More Than Half OF FINES BELOW More Than Half Coarse Fraction Is (little or no SP POORLY GRADED SANDS,GRAVELLY SANDS, 5% CLEAN SANDS NOT MEETING ABOVE by Weight Larger Smaller Than No. fines) LITTLE OR NO FINES REQUIREMENTS Than No.200 4 Sieve) Sieve DIRTY SM SILTY SANDS,SAND-SILT MIXTURES ATTERBERG LIMITS BELOW"A"LINE with P.I.LESS THAN 4 SANDS CONTENT OF FINES EXCEEDS 12% (with some ATTERBERG LIMITS ABOVE"A"LINE fines) SC CLAYEY SANDS,SAND-CLAY MIXTURES with P.I.MORE THAN 7 SILTS Liquid Limit INORGANIC SILTS,ROCK FLOUR,SANDY SILTS (Below A-Line on <50% ML OF SLIGHT PLASTICITY 60 1 1 1 1 / Plasticity Chart, PLASTICITY CHART. / FINE-GRAINED Negligible Liquid Limit INORGANIC SILTS,MICACEOUS OR 50_ FOR SOIL PASSING / SOILS Organics) >50% MH DIATOMACEOUS,FINE SANDY OR SILTY SOIL NO.40 SIEVE / INORGANIC CLAYS OF LOW PLASTICITY, o /* CH R CLAYS Liquid Limit 40 Y 11 \ (Above A-Line on <50% CL GRAVELLY,SANDY,OR SILTY CLAYS,LEAN 0 / CLAYS / U-Line A-Line Plasticity Chart, Z 30 / Negligible Liquid Limit INORGANIC CLAYS OF HIGH PLASTICITY,FAT >- / Organics) >50% CH CLAYS U Less Than Half by . I 20 / Weight Larger Liquid Limit ORGANIC SILTS AND ORGANIC SILTY CLAYS OF g // CL MH or OH Than No.200 ORGANIC SILTS <50% OL LOW PLASTICITY C. &CLAYS 10 / Sieve(i.e.,fines) / (Below A-Line on 7 FL-M, MLcrOL Plasticity Chart) Liquid Limit OH ORGANIC CLAYS OF HIGH PLASTICITY 4 >50% 0 ML 0 10 20 30 40 50 60 70 80 90 100 HIGHLY ORGANIC SOILS Pt PEAT AND OTHER HIGHLY ORGANIC SOILS LIQUID LIMIT(%) SOIL PARTICLE SIZE GENERAL GUIDANCE FOR ENGINEERING PROPERTIES OF SOILS,BASED ON STANDARD U.S.STANDARD SIEVE PENETRATION TEST(SPT)DATA FRACTION Passing Retained SANDY SOILS SILTY&CLAYEY SOILS Sieve $1Ze Sieve Size Unconfined (mm) (mm) Blow Counts Relative Friction Angle Description Strength Counts qu, Description N Density, % A,degrees N SILT/CLAY #200 0.075 tsf SAND 0-4 0-15 Very Loose <2 <0.25 Very soft FINE #40 0.425 #200 0.075 4-10 15-35 26-30 Loose 2-4 0.25-0.50 Soft MEDIUM #10 2.00 #40 0.425 10-30 35-65 28-35 Medium Dense 4-8 0.50-1.00 Medium Stiff COARSE #4 4.75 #10 2.00 30-50 65-85 35-42 Dense 8-15 1.00-2.00 Stiff GRAVEL >50 85-100 38-46 Very Dense 15-30 2.00-4.00 Very Stiff FINE 0.75" 19 #4 4.75 >30 >4.00 Hard COARSE 3" 76 0.75" 19 COBBLES 76mmto203mm GEO Group Northwest, Inc. BOULDERS >203 mm Geotechnical Engineers,Geologists,& ROCK Environmental Scientists FRAGMENTS >76 mm 13705 Bel-Red Road Bellevue,WA 98005 Phone(425)649-8757 E-mail:Info@geogrourpnw.com ROCK >0.76 cubic meter in volume PLATE Al