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• 6. The soils are not flooded freguently during the growing season <br />(less often than once in 2 years); and, <br />7. The product of K (erodibility factor) x percent slope is less than <br />2.0, and the product of I (soils erodibility) x C (climatic factor) <br />does not exceed 60; and, <br />S. The soils have a permeability rate of at least 0.06 inch (0.15 till) <br />per hour in the upper 20 inches (50 cm) and the mean annual soil <br />temperature at a depth of 20 inches (50 cm) is less than S9 (1S <br />the permeability rate is not a limiting factor if the mean annual soil <br />temperature is 59 (15 or higher; and, <br />9. Less than 10 percent of the surface layer (upper 6 inches) in these <br />soils consists of rock fragments coarser than 3 inches (7.6 cm). <br />The follol:ring modifications and /or interpretations of the National <br />Criteria for Prime Farmlands were 'used in Colorado. <br />The soil ralst have_ <br />1. A developed irrigation water supply that is dependable and adequate <br />to meet moisture requirements 8 out of 10 years and have 4 inches or <br />more available water capacity within a depth of 40 inches (1 meter), or <br />Within the root zone if the root zone is less than 40 inches; <br />2. A growing season of 90 days or more; <br />• <br />3. No water table or the water table is below a depth of 1.5 feet and <br />drainage is possible; <br />4. A conductivity of 8 7TIIT`hOs /cltl or less in the upper 40 inches and <br />permeability is greater than .2 inches /hr. (moderately slow or greater) <br />if the slope is less than 2 percent. These soils are considered capable <br />of being managed so that all horizons within a dept}, of 40 inches (1 meter) <br />or in the root zone if it is less than 40 inches will have a conductivity <br />of the saturated extract of less than 4 mmhos /cm and the exchangeable <br />sodium percentage (ESP) is less than 15; irrigated soils with bedrock <br />within 40 inches of the surface and soil horizons that have a pil higher <br />than 7.4 are considered as having hig <br />prime; h conductivity and therefore not <br />S. slope of irrigated prime farmland will not. exceed 6 percent. <br />Uni ue farmland <br />Unique Farmland is land ogler than Prime Farmland that is used for the <br />production of specific high value food and fiber crops. It has the <br />special combination of soil quality, location, growing season, and <br />moisture supply needed to economically produce sustained high quality <br />and /or high yield of a specific crop, when treated and managed according <br />to acceptable farming methods. Two areas in Colorado are considered <br />Unique Farmlands of National Importance -- the fruit orchards in the <br />Grand Valley and the Delta - Montrose areas, and the seed potato and <br />fruit and vegetable producing areas of the San Luis Valley. <br />3 <br />C7 <br />Revised September 2010 (PR06) Attachment 2.04.9 -5 -8 <br />