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ATTACHMENT 2 32-Nunn clay loam, 0 to 4 percent slopes. This deep, nearly level t0 gentry sloping, well drained, soil is on terraces and fans. It lormed in mixed clayey alluvium. Elevation ranges from about 5,300 to 8,400 feet. Aver- ;~ age annual precipitation is about 14 to 17 inches, aver- ego annual elr temperature le about 47 degrees F, end average frost-free period Is about 135 days. ~ InGuded wRh this soil In mapping are small areas of Englewood Clay bam; Hapluetolls, loamy, Hearty revel; and Meldt clay loam. They each have 0 to 4 percent ' slopes. . Typically, the surface layer is grayish brown clay loam about 8 Inches thick The subsoil is grayish brown clay loam, Clay, and silty clay to a depth of about 40 inches. The substratum la light brownish gray sandy loam to a depth of about 55 inches and light olive brown silty clay to a depth of 80 Inches. ' Permenbllity Is Blow, and avelleble water capacity ie ,high. Surface runoff la slow, and the hazard of erosion le slight ~ . ' 7hls soil la used mainy for nonirrlgated cropland end grazing. A few small areas are used for Irrigated crop- land. Wheat and forage sorghums are the main crops on ,nonirtigated croplerxl. The estimated yield for wheat is about 20 bushels per acre. Alfalfa and corn are the main crops on Irtlgeted cropland. tJrt norttrrlgated cropland, rttanagement practices, such as stubble mulch tlllage and Incorporating crop residue In and on the surface ere needed to Improve water lrtfiltra- tlon. Tillage porn forth easlty H this soil Is tilled when wet Chiseling tx subaolling breaks up Ullege pans end ~; Improves water Infiltration. Tillage operations need to be kept to a minimum. Terracing fe also beneficial !or reduc- ing runoff and conaeMng moisture. Management concema on Irrigated cropland are mafnty proper use of Irtigetion water, slow permeability, end maintenance of ferUllty. incorporating crop residue in the surface Increases infiltration end improves Boil filth. Applications of manure and commercial fertilizers that contain nitrogen end phosphorus are needed to maintain soil productivity. Rangeland vegetation Is mainly western wheatgras: blue grams, green needlegrass, and fourwing saltbust Following prolonged overgrazing, native bluegressan annual grasses, and weeds increase. Contour furrowin: or pitting aids in the recovery of depleted vegetation o: this soil by reducing runoff and Increasing water inflltra lion. Areas that have dense stands 01 pricklypear o rabbltbrush can be managed by chemical control o those species. This soil is well suited to windbreaks and environmen tai plantings. Summer fallow, a year prior to planting ,' supplemental Irrigation during planting and early stage• of growth; and continued Cultivation for weed control an needed to insure the esteblfshment and survival of plant ings. Well suited trees that survive best are Rocky Moun lain juniper, eastern redceder, ponderosa pine, Siberia elm, Russian-olive, and hackberry. The best swtec shrubs are skunkbush sumac, American plum, lilac, am Siberian peaehrub. Limiting soil features for homesites end other urban uses are slow permeability and high shrink-swell potor~ tial. Special designs for buildings antl roads are neede~ to offset these limitations. Special sewage systems, suet _a~ enclosed to kn s that,can be pumped out periodically are needed. Septic tank absorption fields will not tune Uon properly because of the slow permeability. This soil is in capability subclass Ille, nonirrigated arc Ifs, irrigated. THIS SOIL ~IS ITd HEL CLASS 3 FOR WIND AND CLASS 3 FOR 41ATER. THERE AP,E NO HYDRIC COMPONE1dTS IN THIS SOIL UNIT.