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U,S. DEpaR?ME;Ii dF~;6R ~;ULiUR= <br />~i„i~iR.r_ RSSUURCci COtIS ~R'iAi LiN ~ERV:Cc <br />CONSiRUCiION BATcRiALS <br />adapt=. -- CCNSinOCTION MAic3I1LS--Continued <br />pAG. 3 OF 3 <br />C"s; ~i Sg <br />,, <br />TJ pS O:: i5 used t0 COVET 3R di Ed SO That Ve$etat b7A Cdn 68 2Stdb 1lSheJ and and int3l med. IilE upGer 4Q 16Ohes Cr a SO 11 <br />is evaluated for asE as topsoil. Also evaluatzd is thz rECla~nation pot=.ntial of the borro~a area. Plsnt growth is <br />a1r eCCad Gy tOX!C mat2i :al and by s'UCh prOpET t!aa d5 a011 reaCtlOn, a~la'11ab1E 'Adt2r Odpdtl ty, a0d fertll!Ly. the edSB <br />cf e%cavating, laadiag, and spreadins is affected by rock fragments, slope, a water tab la, soil taztur , aad thickness <br />of suitable ,matardi. ~4EClamation of the borrow aria is effected by slope, a avatar table, rock fragments, bedrock, <br />anc ~ozk material. <br />SCiis rtE 'Good' have friablz Ioa~ny matsrial to a dEpth of st least d0 inches. ihzy era free of stooES and co'eblas, <br />ild'ia i!CLE Or n0 gr 3Yel, dnd have alOpeS Of IeSS than 8 par0emt, they dre 10W to Content Of $01Ubie Shcta, dre <br />rid t0 rall'1 fertlla Or ra~pO nd yell t0 fertlilZEr, and arE not 50 filet that E%GdVdti00 1S dlffl OUl t. <br />Sofia rated 'Fair' are sandy soils, loamy soils that have a rElativaly high contzot of clay, soils that have only 2C <br />to VO inches of suitable material, soils that have an appreciable amount of gravel, stones, or soluble salts, or <br />SOiIS that hdV2 SIOpES Of J" i0 IS p'.F~ent. The SOiIS are OOt 50 Uet tidt e%Cd~l3t!On !S d!fflCUlt. <br />$O11S idle 'p00r' drE VEry Shcdy Or Clayey, have 12SS than 2~ 1nChas Of aUltabld maCer131, have 3 large dmOUnt Of <br />grave!, stones, or solublE salts, have slopes of more than 15 pErcent, or hays a seasonal water table at or nzar the <br />surface. the surface layer cf most soils is generally prefarr=d for topsoil becausE of it organic .natter contznt. <br />Organic matter greatly iocreaszs the absorption and retention of moisture and nutrients far plant growth. <br />