Agenda - Council - 10/26/2021 - Laserfiche WebLink

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HAUGE! Descriptive Terminology of Sod Standard D 2487 - 00 Classification of Soils for Engineering Purposes (Unified Soil Classification System) Criteria for Assigning Group Symbols and Group Names Using Laboratory Tests a Soils Classification Group Symbol Group Name b Coarse -grained Soils more than 50% retained on No. 200 sieve . Gravels More than 50% of coarse. fraction retained on No, 4 sieve Clean Gravels 5% or less fines e i C, 4 and 1 C, :•5_. 3 lc GW Well -graded gravel' ! , C < 4 and/or 1 > C > 3 c GP Poorly graded Gravel Gravel's with Fines More than 12% fines e Fines classify as ML or MH GM Silty gravel ' Fines classify as CL or CH GC Clayey gravel 'tg Sands 50% or more, of coarse fraction passes No. 4 sieve Clean Sands 5% or less fines ' ; C > 6 and 1 S.. C Ic3 c SW Well -graded sand n , C -‹ 6 andior 1 > C > 3 c c SP Poorly graded sand n , Sands with Fines , More than 12% 1 , Fines classify as NIL or IMH SM Silty sand '9 h Fines classify as CL or CH SC Clayey sand Igh Fine-grained Soils 50% or more passed the No. 200 sieve Silts and Clays Liquid limit Jess than 50 Inorganic PI > 7 and plots on or above HAline, CL Lean clay k PI < 4 or plots below L'A" line, mML: sat k ' rn Organic Liquid limit - oven dried OL OL Organic clay Organic slit Liquid limit - not dried Silts and clays Liquid imit l 50 or more Inorganic PI plots on or above RA' line CH Fat day k i m PI plots below "A" line MH Elastic silt Organic Liquid limit - oven dried 75 OH OH Organic clay k 1 m Organic silt k ' m q < 0 Liquid limit - not dried Highly Organic Soils Primarily organic matter, dark in color and organic odor PT Peat a Based on the material passing the 3-in (75mm) sieve. b. It field sample contained cobbles or boukiers, or both. add "with cobbles or boulders or both to croup name, c. C D C = (D 6C. c 3D' d h. k in 11. 0. P. q. Plasticity Index (P1) Die x lf soli contains '15% sand, add 'with sand" to group name Gravels with 5 to 12% fines require dual symbols: GVV-GM well -graded gravel with silt GVV-GC well -graded gravel with clay GP -GM poorly graded gravel with silt GP -GC poorly graded gravel wi1hIay If fines classify as CL-IV1L, use dual symbol GC -GM or SG-SM. Iffines are organic, add "vv th organic fines' to group name, If soil contains 15% gravet, add 'with gravel to group name, Sands with 5 to 12% fines require dual symbols: SW-SM well -graded send with silt SW -SC well -graded send with clay SP-SM poorly graded send with sift SP-SC poorly graded sand with clay It Atterberg limits plot in hatched area, soil is a C silty clay. If soil contains 10 to 29% plus No. 200, add with sand or "with graver whichever is predominant. If soil c-ontains > 30% plus No. 200. predominantly sand. add 'sandy' to group name. It soil contains 30% plus No. 200 predominantly gravel, add -gravefl y. to group name: PI 4 and plots on or above 'A' line. PI < 4 or plots below A' fine. PI plots on or above "A' line. PI plots below "A' line. 60 50 40 30 20 10 7 4 DD WD MC LL PL P200 ....N) / / • / o"( / h.. . / o MI1 or . OH e' ML or f/ OL /.7 , ,gt -. tot. /,;',7,,-/;,,,' ,.., 10 16 20 30 Dry density, pcf Wet density. pcf Natural moisture content, % Liqiuid limit, % Plastic limit, % Plasticity index. % % passing 200 sieve 40 50 60 Liquid Limit (LL) Laboratory Tests OC SG C qu qp 70 80 90 100 Organic content, % Percent of saturation_ % Specific gravity Cohesion, psf Angle of internal friction Unconfined compressive strength. Pocket penetrometer strength, tsf psf 110 Particle Size identification Boulders over 12" Cobbles 3' to 12' Gravel Coarse ,... 3/4' to 3' Fine No. 4 to 3/4' Sand Coarse No. 4 to No. 10 Medium No. 10 to No_ 40 Fine No. 40 to No. 200 Silt < No_ 200, PI< 4 or below 'A" line Clay < No. 200. PI> 4 and on or above "A" line Relative Density of Cohesionless Soils Very loose 0 to 4 BPF Loose 5 to 10 BPF Medium dense 11 to 30 BPF Dense 31 to 50 BPF Very dense over 50 BPF Consistency of Cohesive Soils Very soft 0 to 1 BPF Soft 2 to 3 BPF Rather soft_ 4105 BPF Medium 6 to 8 BPF Rather stiff 9 to 12 BPF Stiff 13 to 16 BPF Very stiff 17 to 30 BPF Hard over 30 BPF Drilling Notes Standard penetration test borings were advanced by 3 1/4' or 6 1/4" ID hollow -stem augers unless noted otherwise. Jetting water was used to clean out auger prior to sampling only where indicated on logs. Standard penetration test borings are designated by the prefix "ST" (Split Tube). All samples were taken with the standard 2" OD split -tube sampler, except where noted. Power auger borings were advanced by 4' or 6 diameter continuous - flight, solid -stem augers, Soil classifications and strata depths were in- ferred from disturbed samples augered to the surface and are, therefore, somewhat approximate. Power auger borings are designated by the prefix B. Hand auger borings were advanced manually with a 1 1/2 or 3 1/4" diameter auger and were limited to the depth from which the auger could be manually withdrawn. Hand auger borings are indicated by the prefix BPF: Numbers indicate blows per foot recorded in standard penetration test, also known as "N" value. The sampler was set 6' into undisturbed soil below the hollow -stem auger_ Driving resistances were then counted for second and third 6' increments and added to get BPF. Where they differed significantly. they are reported in the following form: 2/12 for the second and third 6" increments, respectively. WH: VVH indicates the sampler penetrated soil under weight of hammer and rods alone; driving not required, WR: WR indicates the sampler penetrated soil under weight of rods alone; hammer weight and driving not required, TW indicates thin -walled (undisturbed) tube sample. Note: All tests were run in general accordance with applicable ASTM standards. Rev 7/07