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U'.J. UEYAaI'N ENT Ut AU aIUU Lt'UNt YAUE J Ut J <br />NATURAL RESOURCES CONSERVATION SERVICE • ~ 11/31/VS <br />Endnate -- CONSTRUCTION MATERIALS--Costiared <br />CONSTRUCTION MATERIALS <br />topsail is aced to cover as area so that vegetetioa tee be eatebliahed sad Maiataiaed. The upper IU iochea of a soil <br />is evaluated for sae as topsoil. Alen evalMated is the recluatioa potential of the borror area. Plant grorth is <br />affected by tonic Material sad by each properties as soil reaction, eraileble rater capacity, eod fertility. The ease <br />of eeceveting, loading, sad apreediag is affected 6y rock fregrenta, slope, a rater table, soil restore, red thickaeaa <br />of suitable uteriel. geclautioo of the borror area is effected by slope, a rater able, rock fngaente, bedrock, <br />and tonic reterial. <br />Soils rate 'Good' have friable loaMy Material to a depth of at least 10 iochea. They are free of atones sad cobbles, <br />have little ar ao gravel, sad hone alopea of leas rhea 8 percent. they are for in coateat of eolable salts, are <br />naturally fertile or reepoad cell to fertilizer, sad are not so net that ercaoation is difficalt. <br />Soils rated 'Fair' are sandy soils, lout' soils that brae a relatively high content of clay, soils that ha-e Daly 30 <br />to 10 iochea of suitable Material, soils that hoe ea appreciable aeouat of gravel, atones, ar eolable salts, or <br />soils that here alopea of S to IS percent. The soils ere not ao net that ercavation is difficalt. <br />Soils rate 'Poor' are very sandy or clayey, have leas then 30 inches of suitable Materiel, here a large aMaaat of <br />gravel, atones, or eolable salts, hoe alopea of More than IS percent, or have a eeesoaal refer Uble at or Weer the <br />surface. The aorface layer of Moat soils fa generally preferred for topsoil because of it organic Matter content. <br />Organic ratter greatly increases the absorption and teteatioa of Moisture and aotriente for plant grorth. <br />