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Map Unit Description—Weld County,Colorado,Northern Part Koskie Pit 2020 Amendment Hydric soil rating: No 29—Haverson loam, 0 to 3 percent slopes Map Unit Setting National map unit symbol: 35zd Elevation: 3,500 to 6,000 feet Mean annual precipitation: 12 to 17 inches Mean annual air temperature: 46 to 54 degrees F Frost-free period: 125 to 180 days Farmland classification: Prime farmland if irrigated and either protected from flooding or not frequently flooded during the growing season Map Unit Composition Haverson and similar soils: 90 percent Minor components: 10 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Haverson Setting Landform: Stream terraces, flood plains Down-slope shape: Linear Across-slope shape: Linear Parent material: Stratified, calcareous loamy alluvium Typical profile H1 -0 to 12 inches: loam H2- 12 to 60 inches: stratified sandy loam to loam Properties and qualities Slope. 0 to 3 percent Depth to restrictive feature: More than 80 inches Natural drainage class: Well drained Runoff class: Low Capacity of the most limiting layer to transmit water(Ksat): Moderately high to high (0.57 to 2.00 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Calcium carbonate, maximum in profile: 15 percent Gypsum, maximum in profile: 1 percent Salinity, maximum in profile: Nonsaline to moderately saline (0.0 to 8.0 mmhos/cm) Available waterstorage in profile: High (about 9.6 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 4c Hydrologic Soil Group. B Ecological site: Overflow(R067BY036CO) uSDA Natural Resources Web Soil Survey 3/24/2020 Conservation Service National Cooperative Soil Survey Page 4 of 8