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65 <br />TAB 9 <br />• TABLE 9-1* <br />SUtMY~.RY OF SURFACE SOIL AND SUBSOIL PRIME <br />FARMLAND NEGATIVE DL•TERNIINATIGN <br />Nucla Mine, Nbntrose County, Colorado <br />5810 5810 <br />~ <br />5810I 5810I 5810E 9904 <br />Determining Criteria Shawano Shawano Shawano Persayo <br />B Slope C Slope D Slope D Slope <br /> Historic use Yes1 Yes Yes Yes <br /> Soil map units designated prime farmland by NoZ Noz Noz NoZ <br /> the USDA-SCS <br /> Temperature regime Yes3 Yes3 Yes3 Yes3 <br /> Moisture regime No No No No <br /> Greater than 35 cm. (14 inches) precipitation NO No No No <br /> Irrigated or subirrigated Yes Yes No No <br /> Dependable developed water supply of adequate N <br />" N <br />" N <br />" id <br />" <br /> quality (7 out of 10 years) o o o o <br /> Nbre than 4 hectares (10 acres)/single tract Yes Yes No No <br />• Slopes less than lOb Yes Yes No No <br /> Soil depth class is deep or profile depth <br /> (A, B, C horizons) is greater than 1 meter Nos Nos Nos Nos <br /> (40 inches) <br /> Less than 10~ rock fragments greater than <br /> 7.5 crti (3 inches) diameter in upper 15 can Yes Yes Yes Yes <br /> (6 inches) <br /> pH of all root zone horizons is between (No) c (No) a (No) 6 (NO) c <br /> 4.5 and 8.4 (4.5 to 7.4 in Colorado) <br /> Conductivity of all root zone horizons is Yes Yes Yes Yes <br /> less than 4.0 mmhos/cm. <br /> ESP of all root zone horizons is less than Yes Yes Yes Yes <br /> 15 (SAR less than 13) <br /> Permeability greater than 0.15 cm (0.06 <br />Yes <br />Yes <br />Yes <br />Yes <br /> inches) per hour in upper 50 cTn (20 inches) <br /> Water table below root zone during gracing <br />Yes <br />Yes <br />Yes <br />Yes <br /> season <br /> "K" value' (erodibility factor) 0.30 0.25 0.30 0.30' <br /> Times percent slope 2-5~ 5-10$ 10-208 10-20~ <br /> is less than 2.0 Yes Noe No No <br />• "I" value9 (soil erodibility factor) 5 5 5 5 <br /> Times "C" (climatic factor) <br /> is less than 60 <br />*FOOtnotes on following page <br />