2201 100TH ST SW AD SYSTEMS Geotech Report 2022-10-25

Soil Classification System uSCS MAJOR GRAPHIC LETTER TYPICAL. DIVISIONS SYMBOL SYMBOL DESCRIPTIONSI'11z> 5 o_°o ;a GW Well-graded gravel;gravel/sand mixture(s);little or no fines GRAVEL AND CLEAN GRAVEL �r :.b: ;q: v,m GRAVELLY SOIL (Little or no fines) o'.o.0'0 0, Gp Poorly graded gravel;gravel/sand mixture(s);little or no fines .5 a (More than 50%of GRAVEL WITH FINES ) ' ,t GM Silty gravel;gravel/sand/silt mixture(s) 0 a t coarse fraction �.. . W E'y (Appreciable amount of 1 Z'6 C retained on No.4 Clayey gravel;gravel/sand/claymixture(s) °o sieve) fines) ° GC Yey ( ) o N Z CLEAN SAND SW Well-graded sand;gravelly sand;little or no fines c c SAND AND v)t r SANDY SOIL (Little or no fines) � SP Poorly graded sand;gravelly sand;little or no fines Q `w d U ,- (More than 50%of SM Silty sand;sand/silt mixtures) coarse fraction passed SAND WITH FINES 0 . . through No.4 sieve) (Appreciable amount of SC Clayey sand;sand/clay mixture(s) fines) .); ML Inorganic silt and very fine sand;rock flour;silty or clayey fine m SILT AND CLAY sand or clayey silt with slight plasticity p„.1 o Inorganic clay of low to medium plasticity;gravelly clay;sandy to 10 a CL clay;silty clay,lean clay WE z° (Liquid limit less than 50) Z\ H OL Organic silt;organic,silty clay of low plasticity c d d MH Inorganic silt;micaceous or diatomaceous fine sand 0, .1°c o H SILT AND CLAY Z y CH Inorganic clay of high plasticity;fat clay o H (Liquid limit greater than 50) LL _ OH Organic clay of medium to high plasticity;organic silt HIGHLY ORGANIC SOIL PT Peat;humus;swamp soil with high organic content v GRA PHIC LETTER OTHER MATERIALS SYMBOL SYMBOL TYPICAL DESCRIPTIONS PAVEMENT AC or PC Asphalt concrete pavement or Portland cement pavement ROCK RK Rock(See Rock Classification) • WOOD WD Wood,lumber,wood chips DEBRIS ��p DB Construction debris,garbage n n i Notes: 1. Soil descriptions are based on the general approach presented in the Standard Practice for Description and Identification of Soils(Visual-Manual Procedure), as outlined in ASTM D 2488.Where laboratory index testing has been conducted,soil classifications are based on the Standard Test Method for Classification of Soils for Engineering Purposes,as outlined in ASTM D 2487. 2. Soil description terminology is based on visual estimates(in the absence of laboratory test data)of the percentages of each soil type and is defined as follows: Primary Constituent: >50%-"GRAVEL,""SAND,""SILT,""CLAY,"etc. Secondary Constituents: >30%and<50%-"very gravelly,""very sandy,""very silty,"etc. >12%and<30%-"gravelly,""sandy,""silty,"etc. Additional Constituents: > 5%and<12%-"slightly gravelly,""slightly sandy,""slightly silty,"etc. < 5%-"trace gravel,""trace sand,""trace silt,"etc.,or not noted. Drilling and Sampling Key Field and Lab Test Data SAMPLE NUMBER&INTERVAL SAMPLER TYPE Code Description Code Description 1 Sample Identification Number a 3.25-inch O.D.,2.42-inch I.D.Split Spoon PP=1.0 Pocket Penetrometer,tsf b 2.00-inch O.D.,1.50-inch I.D.Split Spoon TV=0.5 Tonrane,tsf Recovery Depth Interval c Shelby Tube PID=100 Photoionization Detector VOC screening,ppm 1-1 1 1 —Sample Depth Interval d Grab Sample W=10 Moisture Content, J e Other-See text if applicable D=120 Dry Density,pcf Portion of Sample Retained 1 300-lb Hammer,30-inch Drop -200=60 Material smaller than No.200 sieve,% for Archive or Analysis 2 140-lb Hammer,30-inch Drop GS Grain Size-See separate figure for data 3 Pushed AL Atterberg Limits-See separate figure for data 4 Other-See text if applicable GT Other Geotechnical Testing Groundwater CA Chemical Analysis Z7 Approximate water elevation at time of drilling(ATD)or on date noted. Groundwater ATD levels can fluctuate due to precipitation,seasonal conditions,and other factors. Proposed AD Systems Figure OeOTe5T Expansion2201 100th Street SW Soil Classification System and Key Everett,WA