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I
<br /> San Joaquin County, California
<br /> 29
<br /> F rootingdepth is limited p d by the bedrock at a depth of 10 in the slightly lower landscape positions. Also included
<br /> to 20 inches. Runoff is slow or medium, and the hazard are small areas of Cogna, Finrod, and Hollenbeck soils
<br /> of water erosion is slight or moderate. in landscape positions similar to those of the Archerdale
<br /> The Lithic Xerorthents are very shallow and are soil. Included areas make up about 15 percent of the
<br /> moderately well drained and well drained. They formed total acreage.
<br /> in material weathered from hard, rhyolitic, tuffaceous Permeability is slow in the Archerdale soil. Available
<br /> sandstone. Typically, 1 to 3 percent of the surface is water capacity is high. The shrink-swell potential also is
<br /> covered with cobbles. The surface layer is light high. The effective rooting depth is 60 inches or more.
<br /> brownish gray gravelly loam about 3 inches thick. Runoff is slow, and the hazard of water erosion is {
<br /> White, rhyolitic, tuffaceous sandstone bedrock is at a slight. The rate of water intake in irrigated areas is 1.0 r
<br /> depth of 3 inches. In some areas the surface layer is inch per hour. The hazard of soil blowing is moderate.
<br /> gravelly sandy loam or loam. The soil is subject to rare flooding, which occurs during
<br /> Permeability is moderate in the Lithic Xerorthents, years of abnormally high precipitation. I
<br /> Available water capacity is very low. The effective Most areas are used for irrigated crops or orchards.
<br /> rooting depth is limited by the bedrock at a depth of 1 to A few areas are used for homesite development. This
<br /> 4 inches. Runoff is rapid, and the hazard of water unit may provide wetland functions and values. These
<br /> erosion is moderate.' should be considered in plans for enhancement of
<br /> Most areas of this unit are used for livestock grazing. wildlife habitat or land use conversion.
<br /> r.- -General management considerations include the very This unit is suited to irrigated row, field, and orchard 1
<br /> low available water capacity, the limited depth, and the crops. The main limitation is the slow permeability 3
<br /> hazard of erosion. The characteristic plant community below the overwash layer. General management
<br /> (^ on the Amador soil is soft chess, ripgut brome, (oxtail considerations include the hazard of soil blowing.
<br /> .k fescue, and filaree. The Lithic Xerorthents support only Because of the restricted permeability, water
<br /> _,a sparse stand of plants that are suitable for grazing. applications should be regulated so that the water does
<br /> These plants are soft chess, toad rush, and hairgrass. not stand on the surface and damage the crops.
<br /> r£.Thevery low available water capacity limits the Furrow, border, and sprinkler irrigation systems are
<br /> production of desirable forage plants. Fencing is difficult suitable. When the wind velocity is high in spring, the
<br /> because of.the limited depth to bedrock. Grazing should hazard of soil blowing can be reduced by properly
<br /> be coritralied so that desirable vegetation, such as soft managing all crop residue and by minimizing tillage.
<br /> chess,:js maintained and enough vegetation is left
<br /> standin 'to protect If this unit is used for homesite development, the
<br /> 9 p the soils from erosion. Loss of the main limitations are the high shrink-swell potential, low
<br /> Surface layer results in a severe decrease in
<br /> rgductivity and in the potential of the unit to produce strength, and the slow permeability below the overwash.
<br /> �pThe rare flooding is a hazard. Properly designing
<br /> Alants suitable for grazing.
<br /> foundations and footings and diverting runoff away from
<br /> 3ThEs map unit is in capability subclass Vile
<br /> s (MLRA i8) sed
<br /> ,`nonirngated. It is in vegetative soil group G. by!hrnkingland swelp to ling. Properly designing builnt the structural damage dings
<br /> and roads can offset the limited ability of the soil to g
<br /> rcherdale Wery fire sandy loam 0 to 2
<br /> Percent slopes"overyvashed. This very deep, well fieldsups, he rt a slow permeabilad. On sites ity can tlbe overcome bc tank y"•` drained riearlylevel soil is on alluvial fans. It formed in increasing the size of the absorption field. Houses,
<br /> alluvium derived frorrr`m
<br /> by mixed.rock sources. A few areas roads, and streets should be constructed above
<br /> tent
<br />� are dissected ntefmitsloughs that have been
<br /> filled as a result of cardtentexpected flood levels.
<br /> leveling. Elevation is 60 to 90 This map unit is in capability units Ifs-3 (MLRA-17),
<br /> eet The avefage annual precipitation is about 14
<br /> orches, the avers a irrigated, and IVs-3 (MLRA-17), nonirrigated. it is in
<br />��degrees e: 5 arnuai Fair temperature is about 60 vegetative soil group A.
<br /> , and the average frost-free period is about `
<br /> J
<br /> TYptcaliy;�e� ' fay�� is brown very 107—Archerdale clay foam, 0 to 2 percent slopes.
<br /> about 18 inches thick:Below this is a buriedandy
<br /> ek? ace lays; ofThis very deep, well drained, nearly level soil is on low
<br /> finchesegrayish brown clay loam about 20 fan terraces. It formed in alluvium derived from mixed
<br /> thlckl-he` Y rock sources. A few areas are dissected by intermittent
<br /> subsoil to a.depth of 60 inches is gay so sloughs that have been filled as a result of land
<br /> yeas the surface layer is fine leveling. Elevation is 40 to 130 feet. The average
<br /> si aciay loam.
<br /> in annual precipitation is about 14 inches, the average R
<br /> ark small areas of Columbia soils annual air temperature is about
<br /> � ��� 60 degrees F, and the
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