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<br />U.S. DEPARTMENT U. AGRICULTURE
<br />NATURAL RESOURCES CO!lSERVATION SERVICE
<br />PAGE 2 OE 3
<br />D2/lE/97
<br />COfISiRUCTION MATERIALS
<br />Endnote -- CONSTRUCTION MATERIALS
<br />This report gives information about the soils as a source of roadfill, sand, gravel, end topsoil. The soils are rated
<br />'Good', 'Fair', or 'Poor' as a source of roadfill and topsoil. They are rated as a 'Probable' or 'Improbzble'
<br />source of sand and gravel. The ratings are based on soil Droperties and site features that affect the removal of the
<br />soil and its use as construction material. Normal compaction, minor processing, end other standard Construction
<br />practices are assumed. Each soil is evaluated to a depth of 5 or 6 feet.
<br />Roadfill is soil material that is a%cavated in ane place and used in road embankments in another place. In this report, ,:
<br />the soils are rated as a source of roadfill for low embankments, generally less than 6 feet high ar,d less
<br />e%acting in design than higher embankments. The ratings are for the soil material belov the surface layer to a
<br />depth of 5 or 6 feet. [t is assumed that soil layers will be mired during ezcavating and spreading. ,Many soils have
<br />layers of contrasting suitability within their profile, ihE report entitled Fngineering Index Properties is also available
<br />and it provides detailed information about each soil later. This information can help determine the suitability of each
<br />layer for use as roadfill. The performance of soil after it is stabilized with lime or cement is not considered in
<br />the ratings.
<br />ihP ratings art based on soil proparties, sih features, and observed performance of the soils, the thickness of
<br />suitable material is ~ minor consideration. ihP ease cf a%cavation is affected by large stones, a high water table,
<br />and slope. How w?11 the soil performs in Dl ace after it has teen compacted and drainEd is determined Gy its strength (as
<br />inf ?rred from the engineE ring clas sif icatior~ of the spill oiid shrink-swill potentiz 1.
<br />Soils rated 'Good' contain sisnificant amounts of sand or gravel or Goth. They have at least 5 feet of suitable
<br />material, a low shrink-swell potential, feu cobbles and stones, and slopes of 15 percent c' less. Depth to tha
<br />utter table is more than 3 feet
<br />$O11S feted ~f airy ha'/2 mJfe thdn ?S pEr[ent <Ilt- end Cld}'-;12Pd DartIC 1F5 ai,d flavP d C1d5t1L1tY Gf lE;; than 10.
<br />They h34e d modaratP Shrink -;wEll pot elltidl, sl c'F'e5 Of 15 t9 LS pPPCPnt, Of many StGOEa. Depth to Ci,a water tab1P 15 1
<br />tG 5 f??v.
<br />Soils rated `Poor' have a plasticity index Gf more than 10, a high shrink-su;ll potential, many stones, or slopes of
<br />more tha, 25 p?teen t, That' ere wet, a^.d the depth to the water table is le<s titan 1 foot, these <_<ts ray hdvE
<br />layers Gf SU'tdG1P fat :; 1='.~, fUi ii.e n3te"]ai i; lE;; than 3 tact tt11 Ch.
<br />Sdnd and 9rdVel 'crP natural aSgregatES sUltdbla `.' CGP:,i~"Clal USe '.th a P,inlmUS t' DrmCESSing, S?,^ aqd
<br />graval are used i.. many kinds of construction. Specifications for each use vary widely. In this re:ort only
<br />the proGaGili t> fincing ma Carta! ;n sui tadlE auactaY is aval ua tE d. ihE <ui tatilitY of th? meter lal h:- :pacific
<br />purpos?s is not evaluated, r.or ere factors that affect Excavation of the aa,Eria1. The properties used to eva!uat?
<br />the SO11. a5 d SOUrC? G` E_.,.. G i'aeEl arE grddatltn G1 Srdln ;12e5 (8S Ind`CatEd by the en$1n2Eri[> Clas;:f iCatiO^
<br />cf the soil), the thicknass of suitable material, and th;e content of rock fragments. Kinds Gf roc'r., r.idi`.y, and
<br />Stratlf iCatiOn a c ;i VEn in Cite SG11 retie. de iCr1Dt10rd. (radatlen e' c; aii, SiZeS is given in fhE '_ri9lnEPriGg Ind?%
<br />Fropartiis report.
<br />A S^11 rat?d a5 2 ~PrCtct,l E' cpUrCE f:as d 1eyEr Ci C1Ee" Sand dnd C'aVal Of e layer Cf aand C' !' .. ~.. ,.._t WOLa1nS
<br />~~"r :0 1? percert silt:' ,ine_. this maferia! rust G? e: least 3 fee`. thick znd less than 52 peso:,.., by eia,i, larSe
<br />stenos, 611 other soils are rted as an ~LnprcbablP' source, Ccars? iragaents of scr~ b?droci, ;c:h a> s-,aiE and
<br />-...-pits. _,c rr7t ears i.:'ire~t ..~ be __.: and crd:cl.
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