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• (iv) The soils either have no water table or have a water table that is maintained at a sufficient depth during the <br />cropping season to allow cultivated crops common to the area to be grown. <br />(v) The soils can be managed so that, in all horizons within a depth of 40 inches (1 meter) or in the root zone'rf the <br />root zone is less than 40 inches deep, during part of each year the conductivity of the saturation extract is less than <br />4 mmhos/cm and the exchangeable sodium percentage (ESP) is less than 15. <br />(vi) The soils are not flooded frequently during the growing season (less than once in 2 years). <br />(vii) The product of K (erodibility factor) x percent slope is less than 2.0, and the product of I (soils erodibiliiy) x C <br />(GimaGc factor) does not exceed 60. <br /> <br />(viii) The soils have a permeability rate of at least 0.06 inch (0.15 cm) per hour in the upper 20 inches (50 cm), and <br />the mean annual soil temperature at a depth of 20 inches (50 cm) is less than 59o F (15o C). The permeability rate <br />is not a limiting factor'rf the mean annual soil temperature is 59o F (15o C) or higher. <br />(ix) Less than 10 percent of the surface layer (upper6 inches) in these soils consists of rock fragments coarser than <br />3 inches (7.6 cm) in diameter. <br />• <br />• <br />(Revised March 2006) Attachment 2.04.9-3-40 <br />