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RELATIVE DENSITY OR CONSISTENCY VERSUS SPT N-VALUE <br />COHESIONLESS SOILS <br />COHESIVE SOILS <br />Approximate <br />Density <br />N (bbws/ft) <br />Approximate <br />Consistency <br />N (blows/ft) <br />Undrained Shear <br />Relative Density(%) <br />Strength (psf) <br />Very Loose <br />0 to 4 <br />0 - 15 <br />Very Soft <br />0 to 2 <br /><250 <br />Loose <br />4 to 10 <br />15 - 35 <br />soft <br />2 to 4 <br />250 - 500 <br />Medium Dense <br />10 to 30 <br />35 - 65 <br />Medium Stiff <br />4 to 8 <br />500 - 1000 <br />Dense <br />30 to 50 <br />65 - 85 <br />Stiff <br />8 to 15 <br />1000 - 2000 <br />Very Dense <br />over 50 <br />85 - 100 <br />Very Stiff <br />15 to 30 <br />2000 - 4000 <br />Hard <br />over 30 <br />>4000 <br />USCS SOIL CLASSIFICATION SYSTEM <br />MAJOR DIVISIONS <br />GROUP DESCRIPTIONS <br />Gravel and <br />GW <br />Well -graded GRAVEL <br />Coarse <br />Clean Gravel <br />•' <br />Grained <br />Gravelly Soils <br />(little or no fines) <br />o �c <br />GP <br />Poody-graded GRAVEL <br />Soils <br />More than <br />50% of Coarse <br />Gravel with <br />o c <br />GM <br />Sifty GRAVEL <br />Fraction Retained <br />Fines (appreciable <br />on No. 4 Sieve <br />amount of fines) <br />GC <br />Clayey GRAVEL <br />Sand and <br />Clean Sand <br />SW <br />Well -graded SAND <br />More than <br />Sandy Soils <br />(little or no fines) <br />.' <br />$P <br />Poody-graded SAND <br />50% Retained <br />50% or More <br />on No. <br />of Coarse <br />Sand with <br />$M <br />Silty SAND <br />200 Sieve <br />Fines (appreciable <br />Fraction Passing <br />Size <br />amount of fines) <br />.' <br />SC <br />Clayey SAND <br />No. 4 Sieve <br />ML <br />SILT <br />Fine <br />Sift <br />Liquid Limit <br />Grained <br />and <br />CL <br />Lean CLAY <br />Soils <br />Less than 50% <br />Gay <br />_ <br />— <br />OL <br />Organic SILT/Organic CLAY <br />MH <br />Elastic SILT <br />50% or More <br />Sift Liquid Limit <br />Passing <br />and 50 % or More <br />CH <br />Fat CLAY <br />No. 200 Sieve <br />Clay <br />Size <br />OH <br />Organic SILT/Organic CLAY <br />Highly Organic Soils <br />it, v <br />PT <br />PEAT <br />COMPONENT DEFINITIONS <br />COMPONENT <br />SIZE RANGE <br />Boulders <br />Larger than 12in <br />Cobbles <br />3 in to 12 in <br />Gravel <br />3 in to No 4 (4.5mm) <br />Coarse gravel <br />3 in to 3/4 in <br />Fine gravel <br />314 in to No 4 (4.5mm) <br />Sand <br />No. 4 (4.5 mm) to No. 200 (0.074 mm) <br />Coarse sand <br />No. 4 (4.5 mm) to No. 10 (2.0 mm) <br />Medium sand <br />No. 10 (2.0 mm) to No. 40 (0.42 mm) <br />Fine sand <br />No. 40 (0.42 mm) to No. 200 (0.074 mm) <br />Silt and Clay <br />Smaller than No. 200 (0.074mm) <br />TEST SYMBOLS <br />%F <br />Percent Fines <br />AL <br />Atterberg Limits: PL = Plastic Limit <br />LL = Liquid Limit <br />CBR <br />California Bearing Ratio <br />CN <br />Consolidation <br />DID <br />Dry Density (pcf) <br />DS <br />Direct Shear <br />GS <br />Grain Size Distribution <br />K <br />Permeability <br />MD <br />Moisture/Density Relationship (Proctor) <br />MR <br />Resilient Modulus <br />PID <br />Photoionization Device Reading <br />PP <br />Pocket Penetrometer <br />Approx. Compressive Strength (tsf) <br />SG <br />Specific Gravity <br />TC <br />Triaxial Compression <br />TV <br />Torvane <br />Approx. Shear Strength (tsf) <br />UC <br />Unconfined Compression <br />SAMPLE TYPE SYMBOLS <br />®2.0" OD Split Spoon (SPT) <br />(140 lb. hammer with 30 in. drop) <br />IShelby Tube <br />3-1/4" OD Split Spoon with Brass Rings <br />OSmall Bag Sample <br />Large Bag (Bulk) Sample <br />Core Run <br />Non-standard Penetration Test <br />(3.0" OD split spoon) <br />GROUNDWATER SYMBOLS <br />Q Groundwater Level (measured at <br />time of drilling) <br />1 Groundwater Level (measured in well or <br />open hole after water level stabilized) <br />COMPONENT PROPORTIONS <br />PROPORTION RANGE <br />DESCRIPTIVE TERMS <br />< 5% <br />Clean <br />5 -12% <br />Slightly (Clayey, Silty, Sandy) <br />12 - 30% <br />Clayey, Silty, Sandy, Gravelly <br />30-50% <br />Very (Clayey, Silty, Sandy, Gravelly) <br />Components are arranged in order of increasing quantities. <br />NOTES: Soil classifications presented on exploration logs are based on visual and laboratory observation. <br />Soil descriptions are presented in the following general order: MOISTURE CONTENT <br />Density/consistency, color, modifier (if any) GROUP NAME, additions to group name (if any), moisture DRY Absence of moisture, dusty, <br />content. Proportion, gradation, and angularity of constituents, additional comments. dry to the touch. <br />(GEOLOGIC INTERPRETATION) MOIST Damp but no visible water. <br />Please refer to the discussion in the report text as well as the exploration logs for a more WET Visible free water, usually <br />complete description of subsurface conditions. soil is below water table. <br />Evergreen Branch Library Expansion LEGEND OF TERMS AND <br />� 9512 Evergreen Way SYMBOLS USED ON <br />EXPLORATION LOGS <br />HWAGMSCIEN ONC. Everett, Washington <br />PROJECT NO.: 2017-036-21 FIGURE: A-1 <br />LEGEND 2017-036.GPJ 5/2/17 <br />