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m N N The qualities and conditions set up as standards for arable land are as follows: Quali ties Arable - Class 1 Arable - Class 2 Texture* Fine Sandy Loam to Clq Loaav Sand to Friable Clay Loam Depth 18 inches good plow soil 12 inches good plow soil 42 inches penetrable to 30 inches penetrable to roots and water. roots and water. . Alkali None Black. Whi te only to Slig~~ H~;Ck (pH 9.0 or total salts of .zt less .5 total salts. Rock No loose rock or cobble No more .than has been re- to hinder cultivation. moved from similar land. Topography General grade 5% .maxi.Im1IIl Smooth 5-10% slopes, or for large smooth bodies, 5% if rough, as much grad- needing no grading and ing and leveling as similar little leveling. land now cultivated re- nuired. Drainage Seepage not apt to start, )lay seep but can be drain- but can be drained, even ed without prohibitive if cheap works reauired. cost - artificiallv. ilWhere soil depth over gravel, coarse sand, or broken rock, approaches the minimum for its class, textures lIlUst be at least as heavy as fine. Soils The geological material from which the soils have developed con- sists largely of alluvial deposits (sand, silt, cobbleS.and clay) -J d.rived from sandstone and shales of adjacent mountai~deposited on ~ valley floor and slopes as a mantle of varying depth over shale and sandstone formatio~ The soils are, with few exceptions, alluvial in origin. Limited tracts are residual from shale and sandstone. The physical features of the area are primarily alluvial fans and terraces or mesas cut by deep drainage channels. The fans and terraces rise from a few feet to several hundred feet above the main Colorado River. They are reasonably broad and gently to moderately sloping. The soils of Harvey Mesa in the general vicinity of Silt are deep silt loams and clq loams of recent origin having been largely deposited from the weathering of the slopes of the Grand Hogback to the '-". ',:: ,.