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• EXHIBIT "AA" 12 SOIL SURVEY This ail has good p tential for urban nd recreational dove] ment. Increas d population gro th in the surve area as resulted in ncreased homesi construction. T e chi limiting soil f stares for urban evelapment are he s 'nk-swell pots ial of the subsoi as it wets and ries d the limited ility of this sail support a load. optic k absorptio fields function operly, but co unity sewage syste s should be prov' ed if the popu] ton den- sity Increas .Because of the moderately rapi permea- bility of th substratum, sew ge lagoons mus be sealed. Lawns, a bs, and trees ow well. Capab' ity subclass IIe irrie ed. 10:-Bankard sandy loam, 0 to 3 percent elopes. This is a deep, somewhat excessively drained soil on flood plains at elevations of 4,950 to 5,000 feet. It formed in stratified recent alluvium along streams and rivers. In- cluded in mapping are numerous sand and grave] bare and small areas of noncalcareous soils. Typically the surface layer of this Bankard soil is brown sandy loam about 4 inches thick. The underlying material to a depth of 60 inches is pale brown calcareous sand stratified with thin lenses of sandy loam, loam, and fine gravel. Permeability is moderately rapid. Available water capacity is low. The effective rooting depth is 60 inches or more. Surface runoff is slow, and the erosion hazard is low. This soil is suited to limited cropping. It is sandy and subject to flooding. Pasture is the best use. Tall wheat- grass, tall fescue, and annual sweetclover are some of the most suitable crops. Light, frequent irrigation by furrows and flooding is best. Commercial fertilizer improves the amount and value of forage produced. The potential native vegetation is dominated by switchgrass, indiangrass, sand bluestem, sand reedgrass, sideoats grams, needleandthread, and blue grams. Much of this range site includes other soils and vegetation in such a complex pattern that it is difficult to map them separately. Potential production ranges from 2,500 pounds per acre in favorable years to 1,500 pounds in unfavorable years. As range condition deteriorates, the tall and mid grasses decrease; blue grams, sand drepseed, and forbs increase; and forage production drops. Undesirable weeds and annuals invade the site as range condition becomes poorer. Management of vegetation should be based on taking half and leaving half of the total annual production. Seed- ing is desirable only in areas large enough to interseed or to prepare a seedbed. Switchgrass, sand bluestem, sand reedgrass, sideoats grams, little bluestem, blue grams, pu- bescent wheatgrass, and intermediate wheatgrass are suitable for seeding. This soil can be seeded by using an interseeder or a firm, clean sorghum stubble. A grass drill is required. Seeding early in spring has proven most suc- cessful. This soil is generally not suited to the establishment and growth of trees and shrubs. Onsite investigation is needed to determine feasibilit}• xnd possible tree and shrub species. Wildlife is an important secondary cropland areas provide favorable hob pheasant and mourning dove. Many r be attracted by establishing areas fot cover. For pheasants, undisturbed ne; tial and should be included in plans ment, especially in areas of intensive land wildlife, for example, deer and tracted by managing livestock gro where needed. This soil is not suited to urban or r ment because of the flood hazard. IVw irrigated, VIw nonimgated; range site. 11-BY ser sandy loam, 0 t 1 pe a deep, ell drained soil on to aces a to 9,8 feet. It formed alluviur Sour Platte River. Includ in maps of ils that have sand d gravel]} p of the substratum. ically the surface ayer is grayi: bout 11 inches thick. he subsoil is 1 brown sandy clay 1 m about 19 Inc stratum to a depth f 60 inches is ]oar Permeability d available wt moderate. The ffective rooting del more. Surface off is slow, and t low. This soil ' used almost entirely fc is suited t all crops commonly w~ ing corn, agar beets, beans, alf a, e and oni s. An example of a s table to 4 ors of alfalfa follow d by a saga beets, small grain, or sans. Fe' tics are needed to mainta' top yield ll methods of irriga on aze suit gation is the most co man. Barnya mercial fertilizer are eded for top y Windbreaks and a vironmental pla suited to this soil. oil blowing, the establishing trees and shrubs, can b tivating only in he tree row and b, vegetation be eon the rows. Sup may be need d at the time of plan periods. Tre that aze best suited are Rocky ountain juniper, eas gins, Sib 'an elm, Russianoli 2 shrubs st suited are skunkbu sun tse of this soil. The tat far ring-necked angame species can nesting and escape ling cover is essen- or habitat develop- agriculture. Range- mtelope, can be st- ing and reseeding creational develop- ;apability subclass mdy Bottom land :ent slopes. Th's is elevations of ,700 deposited the ng are sm I areas sand in a lower bro sandy loam rown d yellowish es ick The sub- y s nd. e capacity are is 60 inches or eresion hazazd is irrigated crops. It in the area inclu call grain, polar s, rapping system 3 n, corn for age, conservatio prac- tle, but f crow ir- 1man and com- e generally t tpal hazard in trolled by cul- rving a strip of onto] irrigation and during dry ve good survival hackberry. T ,lilac, and Sib '- use of thi soil. and ma non- ~lishing eas for mts, isturbed inclu din plans reas of intenst d retreat' nal i erow we The an pea rub. Wi life is an important econdar} Rin necked pheasant, mo g dov ga a species can be attr trod by est n sting. and escape cov r. For phea esting cover is essent' I and should t for habitat developm t, especially in agriculture. This soil has goo potential for urb; development. La s, shrubs, and tre