4920 EVERGREEN WAY STAPLES Geotech Report 2022-10-25

UNIFIED SOIL CLASSIFICATION SYSTEM Soil Classification Criteria for Assigning Group Symbols and Group Names Using Laboratory Tests A Group Group NameB Symbol Gravels: Clean Gravels: Cu>_4 and 1 <_Cc<_3E GW Well-graded gravel F More than 50%of Less than 5%fines C Cu<4 and/or 1 >Cc>3 E GP Poorly graded gravel F coarse fraction retained Gravels with Fines: Fines classify as ML or MH GM Silty gravel F,G.H Coarse Grained Soils: on No.4 sieve More than 12%fines C Fines classify as CL or CH GC Clayey gravel F,G,H More than 50%retained on No.200 sieve Sands: Clean Sands: Cu>_6 and 1 <Cc<3 E SW Well-graded sand i 50%or more of coarse Less than 5%fines 0 Cu<6 and/or 1 >Cc>3 E SP Poorly graded sand' fraction passes No.4 Sands with Fines: Fines classify as ML or MH SM Silty sand G•"'' sieve More than 12%fines° Fines classify as CL or CH SC Clayey sand G'"'' PI>7 and plots on or above"A"line' CL Lean clay K.L,M Inorganic: , KLM Silts and Clays: PI<4 or plots below"A"line ML Silt '' Liquid limit less than 50 Liquid limit-oven dried Organic clay K.L,M,N Fine-Grained Soils: Organic: Liquid limit-not dried <0.75 OL Organic siltK.`'M'° 50%or more passes the - No.200 sieve PI plots on or above"A"line CH Fat clay K'I "M Inorganic: Silts and Clays: PI plots below"A"line MH Elastic SiltK'`'M ' Liquid limit 50 or more Organic: Liquid limit oven dried Organic clay B.KB. `'M'P Liquid limit not dried <0.75 OH Organic silt K.' Highly organic soils: Primarily organic matter,dark in color,and organic odor PT Peat A Based on the material passing the 3-inch(75-mm)sieve "If fines are organic,add"with organic fines"to group name. B If field sample contained cobbles or boulders,or both,add"with cobbles ' If soil contains>_15%gravel,add"with gravel"to group name. or boulders,or both"to group name. J If Atterberg limits plot in shaded area,soil is a CL-ML,silty clay. C Gravels with 5 to 12%fines require dual symbols: GW-GM well-graded K If soil contains 15 to 29%plus No.200,add"with sand"or"with gravel," I gravel with silt,GW-GC well-graded gravel with clay,GP-GM poorly whichever is predominant. graded gravel with silt,GP-GC poorly graded gravel with clay. ` If soil contains 30%plus No.200 predominantly sand,add"sandy"to °Sands with 5 to 12%fines require dual symbols: SW-SM well-graded group name. sand with silt,SW-SC well-graded sand with clay,SP-SM poorly graded M If soil contains 30%plus No.200,predominantly gravel,add sand with silt,SP-SC poorly graded sand with clay "gravelly"to group name. (D )2 "PI>_4 and plots on or above"A"line. E Cu=D60/D10 Cc= 30 °PI<4 or plots below"A"line. IDio x D80 PPI plots on or above"A"line. F If soil contains>_15%sand,add"with sand"to group name. °PI plots below"A"line. G If fines classify as CL-ML,use dual symbol GC-GM,or SC-SM. 60 r._. --r — ,--- - For classification of fine-grained , soils and fine-grained fraction / 50 of coarse-grained soils �\c ..',� . f \tee . } Equation of"A"-line .J ," 0_ Horizontal at P1=4 to LL=25.5. X 40 then PI=0.73(LL-20) Q� ,- - w o� o Equation of"U"-line Z Vertical at LL=16 to P1=7, G >- 30 then PI=0.9(LL-8) ' U ,' Q I ~ c Ci) 20 Geo -J J MH or OH i 0_ i /,i I 10 ' 4 -- L - ML_-- ML or OL 0 0 10 16 20 30 40 50 60 70 80 90 100 110 LIQUID LIMIT (LL) lierracon Exhibit C-2