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Soil Survey
<br /> 30
<br /> average frost-free period is about 270 days. They are moderately deep or deep to a hardpan or are
<br /> Typically, the upper 8 inches of the surface layer is very deep. They formed in alluvium derived from mixed
<br /> dark grayish brown clay loam. The lower 16 inches of r ksources.ned soils in the hottles owe ep,r, file indicate
<br /> has beesomewhat
<br /> the on surface layer and the subsoil to a depth of 60 poorly
<br /> inches are brown clay. In some areas the surface layer improved by levees is 20 to 30 feet Theand average annlual p elc p tatioln istion
<br /> is clay silty clay loam. about 11 inches, the average annual air temperature is
<br /> Includd ed in this unit are small areas of Cogna,
<br /> Finrod, Hollenbeck, and Vignolo soils. These soils are about 60 degrees F, and the average frost-free period is
<br /> in landscape positions similar to those of the Archerdale about The60 day .
<br /> surfaceslayer is grayish brown and brown sandy
<br /> soil. Also included, on the slightly higher parts of the loam or loam about 10 inches thick. The upper 30
<br /> landscape, are small areas of Archerdale soils that
<br /> inches of the underlying material is light brownish gray,
<br /> have slopes of 3 percent. Included areas make up
<br /> pale brown, and yellowish brown, mottled loam and clay
<br /> about 15 percent of the total acreage.
<br /> The
<br /> Permeability is slow in the Archerrdeleoil. vaalsoles stronglycemented inches weakly e
<br /> hardpan that hasbeen disrupted by
<br /> water capacity is high. The shrinks potentialThe inches is
<br /> high. The effective rooting depth is 60 inches or more. stpratif edlight brownashtgray anpd grayish b own loamy
<br /> Runoff is slow, and the hazard of water erosion is
<br /> slight. The rate of water intake in irrigatedareas
<br /> sla htSThe
<br /> throughout.0.5 sand and Frr Fragments of the ha hardpan are common
<br /> inch per hour. The hazard of soil blowing g throughout the profile. Fragments of cemented material
<br /> soil is subject to rare flooding, which occurs during are on the surface and throughout the profile in some
<br /> years of abnormally high precipitation. deeply pp
<br /> Most areas of this unit are used for irrigated crops or areas that backhoed,have been subsoiled, dee I ripped, or
<br /> orchards. A few areas are used for homesite Included in this unit are small areas of Manteca,
<br /> development. or, and
<br /> This unit is suited to irrigated row, field, and orchard do not havve a hardpan and are endot sal neuat
<br /> sodic. The
<br /> crops. The main limitation is the slow permeability.
<br /> Because of the restricted permeability, water included soils are in landscape positions similar to
<br /> those o
<br /> _ applications should be regulated so that the water does the total ahcreage ts. They make up about 15 percent of
<br /> not stand on the surface and damage the crops.
<br /> Furrow, border, and sprinkler irrigation systems are Permeability is moderate or moderately slow in the
<br /> suitable. Returning crop residue to the soil or regularly The effective root ngtdepth of er capacity
<br /> crops commonly
<br /> adding other organic material improves fertility, grown in the county is limited by a perched water table
<br /> minimizes crusting, and increases the rate of water t a depth of 3 to 5 feet. Runoff is slow, and the hazard
<br /> intake. of water erosion is slight. The rate of water intake in
<br /> If this unit is used for homesite development, the soils are
<br /> r hour.
<br /> main limitations are the high shrink-s well
<br /> a°eefloloding is subjectal, low to areas is 1.5 inches e
<br /> to rare flooding, which urs during years of
<br /> strength, and the slow permeability. T
<br /> and footings ab
<br /> a hazard. Properly designing foundations Most al areas are rused tfor irrigated crops or pasture.
<br /> and diverting runoff away from buildings help to prevent
<br /> the structural damage caused by shrinking and swelling. TheseThis nshould be c
<br /> Properly desigo s dered init may provide wetland plans fore enhancement
<br /> ning buildings and roads can offset the
<br /> nd use conversion.
<br /> limited ability of the soil to support a load. On sites for of This is un habitat sutitedlato irrigated row and field crops.
<br /> septic tank absorption fields, the slow permeability can
<br /> be overcome by increasing the size of the absorption The main limitations are the saline-sodic conditions and
<br /> the high water table. The content of salts can be
<br /> field. Houses, roads, and streets should be constructed reduced by leaching, applying the proper amount of soil
<br /> above expected flood levels. amendments, and returning crop residue to the soils.
<br /> This map unit is in capability units IIs-3 (MLRA-17),
<br /> irrigated, and IVs-3 (MLRA-17), nonirrigated. It is in Careful applications of irrigation water are needed to
<br /> water table. A drainage
<br /> prevent the buildup of a high
<br /> vegetative soil group A. system may be needed. Intensive management is
<br /> required to reduce the salinity and maintain productivity
<br /> 108—Arents, saline-sodic, 0 to 2 percent slopes. F row, border, and sprinkler irrigation systems ar�larly
<br /> These somewhat poorly drained, nearly level soils are suitable. Returning crop residue to the soils or reg
<br /> in areas on low alluvial fans or fan terraces where addin other organic material improves fertility,
<br /> ripping, cutting, or filling has altered the landscape. g
<br /> j
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