PERMFILE73266 - Laserfiche WebLink

Home Browse Search

• • • Terrace Escarpments Terrace escarpments Rcl ocenr ss breaks or steep side slopes adjacent to the channels of present ar former streams. They also occur as the steep faces of terraces that border bottom ]ands and flood plains. 'Th is land tape consisrs of alluvium of variable materials and is very shallow over gYZVel and sand. These materials have a loamy sand or sandy loam surface layer. In many areas this layer is 5 to ?0 percent gravel. Sha]e and sand- stone outrrops ar4 in some areas. Included in mapping are very small areas of a Gona loamy sand, a Gono sandy loam, and a Dacono loam, all good sails for fay-~+~. The surface layer varies in reaction from place to place and in laces is calcareous. Slopes dilfcr widely wtchia short distances and tztt_~e from 1 to 90 percent. Some cress are used for grszin_, but the soils are too steep, too shallow, or too twstable for cnitivation ar goad ~t•ass management Much of this ]and type is rapidly being mined for sand cad gt•a.vel, cad theresfrer is not usable for farm- ing. Such areas are used as a dumping grotmd or are back filled with better soil material in placrs. ylany cress of this land type are tcell suited to housing or industrial deve!opmears or hi:htcay location. Prior to use for these purposes. however, the stability of the soils should be dete-mined because of slope or laclt of binder soil particles. The soils nornally have ~aod bearing capacity far foundations. low shrnk-swell properties. ^ood nahtral dninage, and a law hazard of hpdrolcsis for buried metal pipe. Open ditches for transporting water are not suited because of rapid <_eepage. In some cress lawns and gardens would hate to be built up, using better soil materials from outer areas. In same arnas. old _ravPl pits have been used as damp areas. then packed and filled wiclt nntside soil materials. and then developed far homesires. Capabilic~• unit GIIe- 3, nonirrigated: Crricel Breaks ran_e site: tree plancin_ suitability group f.