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<br /> 0".C -unty, California .
<br /> ,< 29
<br /> d epth s.-I !ted by,
<br /> the bedrock at a depth of 10 in the slightly lower landscape positions. Also included
<br /> �bChes Runoff is slow of medium, and the hazard are small areas of Cogna, Finrod, and Hollenbeck soils
<br /> ntatr ero5ion is.sl�g ht o moderate. in landscape positions similar to those of the Archerdale
<br /> t :
<br /> t me4L.ithic:Xerorthents are very shallow and are soil. Included areas make up about 15 percent of the
<br /> rately well drained ante well drained. They formed
<br /> etotal,acreage.
<br /> n
<br /> �aterweathered from hard, rhyolitic, tuffaceous Permeability is slow in the Archerdale soil. Available
<br /> idstaneyp�ca>fy, 1 to 3 percent of the surface.is water capacity is high. The shrink-swell potential also is
<br /> y$N., With cobbles The surface layer is light
<br /> high. The effective rooting depth is 60 inches or more.
<br /> ravelt 'loam about 3 inches thick. Runoff is slow, and the hazard of water erosion is
<br /> Hash.g ,y g y .
<br /> ite; rhya4tic tuffaceous sandstone bedrock is ata slight. The rate of water intake in irrigated areas is 1.0
<br /> t# �of 3 inches In..some areas the surface layer is inch per hour. The hazard of soil blowing is moderate.
<br /> yy The soil is subject to rare flooding, which occurs during
<br /> vEll sarid IoarT .or loam.
<br /> lit Y'-Is-moderate in the Lithic Xerorthents. years of abnormally high precipitation.
<br /> ilable wafer capacity is very low. The effective Most areas are used for irrigated crops or orchards.
<br /> t£j depths limiled by the bedrock at a depth of 1 to A few areas are used for homesite development. This
<br /> heshAunoft,is`rapid, and the hazard of water unit may provide wetland functions and values. These
<br /> tionis moderate: should be considered in plans for enhancement of
<br /> nllost areas,of.this unit are used for livestock grazing. wildlife habitat or land use conversion.
<br /> neral management considerations include the very This unit is suited to irrigated row, field, and orchard
<br /> available water capacity, the limited depth, and the crops. The main limitation is the slow permeability
<br /> .,rd,:of erosion. The characteristic plant community below the overwash layer. General management
<br /> the Amadorsoil is soft chess, ripgut brome, foxtail considerations include the hazard of soil blowing.
<br /> ve, and-filaree. The Lithic Xerorthents support only Because of the restricted permeability, water
<br /> arsb'stand of plants that are suitable for grazing, applications should be regulated so that the water does
<br /> ese'..plants are soft chess, toad rush, and hairgrass. not stand on the surface and damage the crops.
<br /> ver low available water capacity limits the Furrow, border, and sprinkler irrigation systems are
<br /> Y . P Y
<br /> uctidn"',of desirable forage plants. f=encing is difficult suitable. When the wind velocity is high in spring, the
<br /> -,use of the limited depth to bedrock. Grazing should hazard of soil blowing can be reduced by properly
<br /> controlled so that desirable vegetation, such as soft managing all crop residue and by minimizing tillage.
<br /> 17s is maintained and enough vegetation is left If this unit is used for homesite development, the
<br /> Lttivity
<br /> 'ing to protect the soils from erosion. Loss of the main limitations are the high shrink-swell potential, low
<br /> e`Iayer results in a severe decrease in strength, and the slow permeability below the overwash,
<br /> and in the potential of the unit to produce The rare flooding is a hazard. Properly designing
<br /> s suitable for grazing. foundations and footings and diverting runoff away from
<br /> ' its map unit is in capability subclass Vlle buildings help to prevent the structural damage caused
<br /> LRA-18), nonirrigated. It is in vegetative soil group G. by shrinking and swelling. Properly designing buildings
<br /> r;
<br /> " and roads can offset the limited ability of the soil to
<br /> " .6—Archerdale very fine sandy loam, 0 to 2 support a load. On sites for septic tank absorption
<br /> cent slopes, overwashed. This very deep, well fields, the slow permeability can be overcome by
<br /> 3- ed, nearly level soil is on alluvial fans. It formed in increasing the size of the absorption field. Houses,
<br /> U um derived from mixed rock sources. A few areas roads, and streets should be constructed above
<br /> :`h
<br /> dissected by intermittent sloughs that have been expected flood levels.
<br /> aFLas a result of land leveling. Elevation is 60 to 90 This map unit is in capability units Its-3 (MLRA-17),
<br /> The average annual precipitation is about 14 irrigated, and IVs-3 (MLRA-17), nonirrigated. It is in
<br /> the average annual air temperature is about 60 vegetative soil group A.
<br /> green F, and the average frost-free period is about
<br /> 07ays. 107—Archerdale clay loam, 0 to 2 percent slopes.
<br /> 1., 'Dically, the surface layer is brown very fine sandy This very deep, well drained, nearly level soil is on low
<br /> m about 18 inches thick. Below this is a buried fan terraces. It formed in alluvium derived from mixed
<br /> f e layer of dark grayish brown clay loam about 20 rock sources. A few areas are dissected by intermittent
<br /> thick. The subsoil to a depth of 60 inches is sloughs that have been filled as a result of land
<br /> "wn clay. In some areas the surface layer is fine leveling. Elevation is 40 to 130 feet. The average
<br /> loam, silt loam, or clay loam. annual precipitation is about 14 inches, the average
<br /> It luded in this unit are small areas of Columbia soils annual air temperature is about 60 degrees F, and the
<br /> Fi'
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