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P
<br /> 98 Soil S,;! ; ..
<br /> table increase the possibility that septic tank absorption too wet reduces productivity and increases t ,e ru
<br /> fields will not function properly. The very slow rate. The very low available water capacity limits t ,
<br /> permeability can be overcome by increasing the size of production of desirable forage plants.
<br /> the absorption field. Properly designing foundations and If this unit is used for homesite development. the
<br /> footings and diverting runoff away from buildings help to main limitations are the depth to bedrock, the high
<br /> prevent the structural damage caused by shrinking and shrink-swell potential, the slow permeability, and Io,,;
<br /> swelling. Properly designing buildings and roads can strength. General management considerations incl.,_:
<br /> offset the limited ability of the soil to support a load. A the hazard of erosion. The cuts needed to provide
<br /> drainage system is needed if roads or building essentially level building sites can expose the bedrn –
<br /> foundations are constructed. Houses, roads, and streets Because of the depth to bedrock, the size of septic i k
<br /> should be constructed above expected flood levels. absorption fields should be increased or specially
<br /> This map unit is in capability units Illw-6 (MLRA-17), designed sewage disposal systems should be used.
<br /> irrigated, and IVw-6 (MLRA-17), nonirrigated. It is in The slow permeability can be overcome by increasin ;
<br /> vegetative soil group F. the size of the absorption field. Properly designing
<br /> foundations and footings and diverting runoff away f ..rn
<br /> 212—Peters clay, 2 to 8 percent slopes. This buildings help to prevent the structural damage caus,:._i
<br /> shallow, well drained, gently sloping and moderately by shrinking and swelling. Properly designing buildin::s
<br /> sloping soil is on hills. It formed in material weathered and roads can offset the limited ability of the soil to
<br /> from andesitic, tuffaceous sandstone. The native support a load. Excavation for roads and buildings
<br /> vegetation is mainly annual grasses and forbs. increases the hazard of erosion.
<br /> Elevation is 135 to 300 feet. The average annual This map unit is in capability subclass, Vie
<br /> precipitation is about 16 inches, the average annual air (MLRA-18), nonirrigated. It is in vegetative soil groin.-,
<br /> temperature is about 60 degrees F, and the average G.
<br /> frost-free period is about 270 days.
<br /> Typically, the upper part of the surface layer is very 213—Piper sandy loam, partially drained, 0 to 2
<br /> dark gray clay about 5 inches thick. The lower part is percent slopes. This very deep, poorly drained, nea !y
<br /> very dark brown clay about 10 inches thick. White level soil is on natural levees and deltas. It formed i -,
<br /> sandstone bedrock is at a depth of 15 inches. In some mixed alluvium derived from granitic rock sources.
<br /> areas the surface layer is gravelly or cobbly clay. Mottles in the profile indicate a poorly drained soil;
<br /> Included in this unit are small areas of Alamo soils in however, drainage has been improved by levees an.i
<br /> drainageways and Pentz and Redding soils on terraces. reclamation projects. Elevation is 15 feet below sea..
<br /> Also included are small areas of fine textured soils that level to 5 feet above. The average annual precipitati�.;n
<br /> have bedrock at a depth of more than 20 inches or in is about 14 inches, the average annual air temperat.,'e
<br /> which gravel and cobbles cover 10 to 35 percent of the is about 60 degrees F, and the average frost-free pt-Jod
<br /> surface. Included areas make up about 15 percent of is about 270 days.
<br /> the total acreage. Typically, the surface layer is dark grayish brown ,nd
<br /> Permeability is slow in the Peters soil. Available brown, mottled sandy loam about 15 inches thick. TFle
<br /> water capacity is very low. The shrink-swell potential is subsoil is light brownish gray, mottled, weakly ceme ted
<br /> high. The effective rooting depth is limited by the sandy loam about 24 inches thick. The underlying
<br /> bedrock at a depth of 10 to 20 inches. Runoff is slow or material to a depth of 60 inches is light brownish g-
<br /> medium, and the hazard of water erosion is slight or mottled loamy sand. The soil is calcareous throught It.
<br /> moderate. In some areas the surface layer is mucky loam. F
<br /> Most areas are used for livestock grazing. A few Included in this unit are small areas of Ryde, Rir cige.
<br /> areas are used for homesite development. This unit Shi ma, and Valdez soils in the slightly lower landsc:-ne c
<br /> may provide wetland functions and values. These positions. Included areas make up about 15 perces' of
<br /> should be considered in plans for enhancement of the total acreage.
<br /> wildlife habitat or land use conversion. Permeability is moderate in the Piper soil. Avaii.:, v'
<br /> Where this unit is used for livestock grazing, general water capacity is low. The effective rooting depth Ale sl
<br /> management considerations include the limited depth, crops commonly grown in the county is limited by , al
<br /> the clayey surface layer, and the very low available apparent water table that is regulated at a depth o` to m
<br /> water capacity. The characteristic plant community is 5 feet by pumping. Runoff is slow, and the hazard rn
<br /> mainly soft chess, wild oat, and filaree. Fencing is water erosion is slight. The rate of water intake in 6(
<br /> difficult because of the depth to bedrock. Trampling of irrigated areas is 1.5 inches per hour. The hazard in,
<br /> the clayey surface layer by livestock when the soil is soil blowing is moderate. The soil is subject to rar
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