7500 HARDESON RD Geotech Report 2022-10-25

I I UNIFIED SOIL CLASSIFICATION SYSTEM Criteria for Assigning Group Symbols and Group Names Using Laboratory Tests" Soil Classification Group I Symbol Group Name° Coarse Grained Soils Gravels Clean Gravels Cu 2 4 and 1<_Cc s 3' GW Well-graded gravel` More than 50%retained More than 50%of coarse Less than 5%fines° Cu<4 and/or 1>Cc>3' GP Poorly graded gravel` I fraction retained on on No.200 sieve No.4 sieve Gravels with Fines Fines classify as ML or MN GM Silty graver'" More than 12%fines< Fines classifyas CL or CH GC Clayey y y graver" Sands Clean Sands Cu a 6 and 1<_Cc<_3' SW Well-graded sand' I 50%or more of coarse Less than 5%fines° Cu<6 and/or 1>Cc>3` SP Poorly graded sand' fraction passes No.4 sieve Sands with Fines Fines classify as ML or MN SM Silty sand°"'" More than i 2%fines° Fines Classifyas CL or CH SC Clayey sand Y Y "' I Fine-Grained Soils Silts and Clays inorganic PI>7 and plots on or above"A"lines CL Lean clay""` 50%or more passes the Liquid limit less than 50 PI<4 or plots below"A"line' ML Silt""' No,200 sieve organic Liquid limit-oven dried Organic clay`'-"'." <0.75 OL I Liquid limit-not dried Organic siltK`�° Sifts and Clays inorganic PI plots on or above'A"line CH Fat clay"`"" Liquid limit 50 or more PI plots below"A"line MH Elastic Silt'-' I organic Liquid limit-oven dried <0.75 OH Organic clay"; Liquid limit-not dried Organic silt'`" Highly organic soils Primarily organic matter,dark in color,and organic odor PT Peat I ABased on the material passingthe 3-in.(75-mm)sieve "If fines are organic,add"with organic fines"to groupname. r9 9 s If field sample contained cobbles or boulders,or both,add"with cobbles ' If soil contains>_15%gravel,add"with gravel"to group name. I or boulders,or both"to group name. If Atterberg limits plot in shaded area.soil is a CL-ML.silty clay. cGravels with 5 to 12%fines require dual symbols: GW GM well graded 'cif soil contains 15 to 29%plus No.200,add`with sand"or"with gravel with silt,GW-GC well-graded gravel with clay,GP-GM poorly gravel,'whichever is predominant. graded gravel with silt,GP-GC poorly graded gravel with clay. ,. I o If soil contains>30%plus No.200 predominantly sand,add Sands with 5 to 12%fines require dual symbols: SW-SM well-graded "sandy'to group name. sand with silt,SW-SC well-graded sand with clay,SP-SM poorly graded n1 sand with silt,SP-SC poorly graded sand with clay If soil contains>_30%plus No.200,predominantly gravel, add"gravelly"to group name. I E (�°)2 NP1.>_4 and plots on or above"A"line. Cu=D60/D1a Cc= D1a x D60 ° PI<4 or plots below"A line. F If soil contains>_15%sand,add"with sand"to group name. BPI plots on or above"A"line. clf fines classify as CL-ML,use dual symbol GC-GM,or SC-SM. ° PI plots below"A"line. I 60 �.... - — For classification of fine-grained soils and fine-grained fraction I 50. of coarse-grained soils Equation of" ��e,r e qA'°-line , \ ,Lop, at Pt=4 to LL=25.5. 1 X 40 -- then PI=0.73(LL-20) 01' w I 0 Z Equation of`U"-tine Vertical at LL=16 to P1=7 G >-- 30'_ then P1=0.9(LL•8) I-v 0" o" I cn 20. ... . Gi' a n_ MH or OH 10 I 4 -i MLorOL 0 i..._. 0 10 16 20 30 40 50 60 70 80 90 100 110 I LIQUID LIMIT(LL)