04-16-2007 Planning Commission Packet

Home Browse Search

� ■ Descriptive Terminology Re".,°`°' , ■ Standard D 2487-00 Particle Size Identification �, Classification of Soils for Engineering Purposes, eouiders..............................over�z• � ..-V�� . (Unified Soil Classification System) cobbies...............................s�ro�z• ,•"�"�•7e0"''� Gravel ■ � Coarse............................3/4'to 3" Fine.................................No.4 to 3/4` CriteriaforAssigningGroupSymboisand SoilsClassification Sand ■ Group Names Using Laboratory Tests° Group Coarse............................No.4 to No.10 Symbol Group Name° Medium...........................No.10 to No.40 � Gravels Clean Gravels C„Z 4 and 15.Ce< 3 c a Fine.................................No.40 to No.2Q0 a GW Well-gradedgtavel Silt.......................................<No.200,P1<4or � Q� More than 50%of Less than 5%fines• C�<4 and/or 1>C�>3� GP Pooriy graded gravel° below°A Ifne � coarsefraction a�° m retained on � Gravels with F(nes Firtes dass as ML or MH GM Sfl avel"�a Clay.....................................<No.200,PI2 4 and c �'N No.4 sieve More than 12%fines• Fines ciassify as CL or CH GC Cla ravel°�9 on or above"A"line ■ iP�°n$ Sands Clean Sands C„z 6 and 1 �C� S 3° SW Well-graded sand^ Relative Density of `L Z 50%or rtwre of Less than 5°�fines' C<6 and/or 1�C >3° SP Poorly graded sand^ Cohesionless Sofls � A-- coarse fracUon ci �' passes � Sands with Fines Fines classify as ML or MH SM Silty sand�eh Very loose................................0 to 4 BPF E No.4 sieve More than 12%� Fines classify as CL or CH SC Cla e sand�9° Loose.......................................5 to 10 BPF w � PI>7 and plots on w above"A°line� CL Lean cia k�m Medium dense.........................11 to 30 BPF ,n= Sfits and Clays Inorgar�c Dense......................................31 to 50 BPF =v PI<4 or plots below°A"line� ML Silt k�"' V dense...............................over 50 BPF o � m Llquld limit � � 9 y m less than 50 p�a�� L(quid 11mit-oven dried � �75 OL Organic clay �'"" c �'o Lt uid ifmit-not dried �� Organic silt R�"'° Consistency of Cohesive Soils ;a o N . PI plots on or above`A"line CH Fat cla k I m Very soft...................................0 to 1 BPF �E o Silts and clays Inorgaruc PI lots below°A'line MH k 1 m Soft .......................................2 to 3 BPF ■ � o z Liquid lim(t P ElasNc siit m D Rather soft...............................4 to 5 BPF t'i aE 50 w rtwre Liquid limit-oven dried �H Organic clay o Organic < 0.75 k I m 9 Medium....................................6 to 8 BPF ■ �n LI uid limit-not dried OH Or nic silt Highly Organfc Solls Primarily wganic matter,dark In color and organic odor PT Peat Ratherstiff...............................9 to 12 BPF Stiff ...... ....13 to 16 BPF a. Based on Ihe materlal pessing Ihe 3-in(75mm)siave. Very stiff...................................17 to 30 BPF � b. M fleld sample contained cobhles or 6oulders,or botA,edd'with cobhles w boulders a both'to group name. Hard .......................................over 30 BPF c. C� =D�/D�o C��(Dm� D�o x D� ■ d. If soil conlatns �5%sand,add lvith sa�"to group name. e. Grevels witih 5l012%Ifnes require dual symbols: GW-GM wep�yraaed eravei wtm sttt Driliing Notes � GW-GC waq-gradad grdval with clay GP-GM poorry gradad grevel wiu�sllt Standard penetration test borings were advanced by 3Y."or 6'/."ID GP-GC poody graded gravei with clay hollow-stem augers unless noted othen.vise,Jetting water was used to f. n fines class(ty as CL-ML,use dual symbd GGGM w sC-SM. clean out auger prior to sampling onlywhere indicated on bgs.Standard � g. It nnes are organtc,add wilh organic Itnes to group name. enetration test borin s are desi nated b the refix"ST" S lit Tube � h. It sal conWins b5%gravel,add'wllh grevel'to group name. p 9 9 y P � p �' 1 i. Sands wim 5 to 12%lines require dual symbas: All samples were taken with the standard 2"OD sptit-tube sampler,ex- SW-SM wefl-praded sand with sil! ceptwhere noted. � SWSC well�raded sand wilh day SP-SM poorly gredad sa�with sin Power auger borings were advanced by 4"or 6"diameter continuous- SPSC poorly graded eand with clay fiight,solid•stem augers.Soil classifications and strata depths were in- � j. �FAtter6erg nmits pat In hatched area,sal Is a CL-ML,siity ciay. ferred from disturbed samples augered to the surface and are,therefore, k. It sofi contains 15 to 2s%plus No.2oD,add tioiu,sand'or�tvith gravar wnichever Is predom�nant. ��,y�t approximate. Power auger borings are designated by the I. It soil contalns �096 plus No.200,predominantly sand,add'sandy ro group name. m.If sofl contafns �096 plus No.200 P�edunlnantly gravel.add•g2velly"to group nama. pfBfiX"B:' ■ n. PI 2 4 and pbts on or above'A'Ilne. o. PI<a or p�ots t�ow'A';i;;o. Hand auger borings were advanced manually wilh a 1'/:'or 3'/,"diam- p. PI plots on or above'A'line. eter auger and were limited to Ihe depth from which the auger could 6e ■ q. P�ptots 6elow'A'Itne. manuallywithdrawn.Hand auger borings are indicated by the prefix"H" 60 � BPF:Numbers indicate blows per foot recorded in shandard penetration � �' test,also known as"N"value. The samoler was set 6"into undisturbed . �� soil below the hollow-stem auger.Driving resistances were then counted �J � `ce for second and thfrd 6"increments and added to get BPF. Where ihey � � �•�' differed signKcantly,they are reported in the following fortn:2/12 forthe � "'� � second and third 6"increments,respectively. a , o x � G� WH:WHindicatesthesampterpenetratedsoilunderweightofhammer ■ � 30 � and rods alone;driving not required. c . �, ' WR: WR indicates the sampler peneVated sdil under weight of rods � • Zp � � alone;hammerweight and driving not required. ti '� �ot � � G MH r OH TW indicates thin-walled(undisturbed)tube sample. ■ 2 10 � 7 _ Note: All tests wera run in generai accordance with applicable ASTM 4 Cl-�ML MH or OH standards. � °o �o �s zo so ao so so �o ao so �oo ��o Liquid Limit(LL) ■ Laboratory Tests DD �ry density,pcf OC Organic content,°h • � WD Wet density,pcf 5 Percent of saturation,°h MC Natural moislure content, % SG Specificgraviry LL Liqiuid limit,% C Cohesion,psf �� � PL Piastic limit,% � Angle of intemal friction �PI Piastiaty index,°� qu Unconfined compressive strength,psf P2000 96 passing 20D sieve qp Pocket penetrometer strength,tsf ('11,��T�� ■ �