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"t'a e Trost-free period is about 270 days. Typically, the upper 8 i fl They are-moderately deep or deep to a hard n r es of the surface layer is very de�They formed in alluvium derived from or., dark grayish brown clay !oma .. The lower 16 inches of the suiface layer and the subsoil to a depth in h rock sources. Mottles in the profile indicate somew inches are brown clay. In some areas the surface layer poorly drained soils; however, drainage has been is clay or silty clay loam. Y improved by levees and reclamation projects. Eleva.I lnciuded in this unit are small areas of C is 20 to 30 feet. The average annual rtatio i i=inrod, Hollenbeck, and Vignalo soils. These soils are about 60 about 11 inches, the average annual air ml pe aturF g g in landscape positions similar to those of the Archerdale about 260 dayses F and the average frost-free Aeric i soil. Also. included, on the slightly higher parts of the landscape, are small areas of Archerdale soils that 30 The surface layer is grayish brawn and brown sar � have slopes of 3 percent. included areas make u loam or loam about 10 inches thick. The upper R inches of the underlying material is light brownish g is a weaklycemented r, about 15 percent of the total acreage. ed Permeability is slow in the Archerdale sail. Available oalm bThennextd1yellowish brown,0 inches loam to water capacity is high. The shrink-swell potential also is strongly cemented hardpan that has been disrupted I high. The effective rooting depth is 60 inches or more. ripping. Runoff is slow, and the hazard of water erosion is The lower part to a depth of 60 inches is I Slight. The rate of water intake in irrigated areas is 4.5 stratified light brownish gray and grayish brown loam inch per hour. The hazard of soll blowing is Slight. The sand and sandy loam. The soils are saline-sodic k g 9 throughout. Fragments of the hardpan are common SON is subject to rare flooding, which occurs Burin t years of abnormally high precipitation. g throughout the profile. Fragments of cemented mater Most areas of this unit are used for irrigated crops or are on the surface and throughout the profile in somf orchards. A few areas are used for homesite R areas that have been subsoiled, deeply ripped, or development. backhoed. This unit is suited to irrigated row, field, and orchard Included in this unit are small areas of Manteca, crops. The main limitation is the slaw Permeability. Timor, and Bisgani soils and medium textured soils th Because of the restricted permeability, water do not have a hardpan and are not saline-sodic. The included are inapplications should be regulated so that the water does those of thelArents. Theyscape ma epup arbouts pe to not stand on the surface and damage the crops. the total acreage. R 15 percent Furrow, border, and sprinkler irrigation systems are Permeability is moderate or moderately slow in the suitable. Returning crop residue to the soil or regularly Arents. Available water capacity is low or moderate. adding other organic material improves fertility, t minimizes crusting, and increases the rate of The effective rooting depth of the crops commonly � water grown in the county is limited by a perched water table at a depth of 3 to 5 feet. Runoff is slow, and the hazar If this unit is used for homesite development, the of water erosion is slight. The rate of water intake in main limitations are the high shrink-swell potential, !ow irrigated areas is 1.5 inches per hour. The soils are strength, and the slow permeability. The rare floodingis a hazard. Properly designing foundations and footings subject to rare flooding, which occurs during years of and diverting runoff away from buildings help to prevent abnormally high precipitation. R Most areas are used for irrigated crops or pasture. the structural damage caused by shrinking and swelling. This unit may� Y provide wetland functions and values. Properly designing buildings and roads can offset the ' limited ability of the sill to su These should be considered in plans for enhancement pport a load. On sites for of wildlife habitat or land use conversion. septic tank absorption fields, the slow permeability can ton This unit is suited to irrigated row and field crops. be overcame by increasing the size of the absor P The main limitations are the saline-sodic conditions an( field. Houses, roads, and streets should be constructed the high wafer table. The content of salts can be above expected flood levels. reduced by leaching, applying the proper amount of s i This map unit is in capability units IIs-3 MLRA-�7 0 ( ), amendments, and returning crop residue to the soils. irrigated, and IVs-3 (MLRA-17), nonirrigated. it is in Careful applications of irrigation water are needed to vegetative soil group A. prevent the buildup of a high water table. A drainage Sys108—Arents, saline-sodic, 0 to 2 percent slopes. rrequiredntoy duce the be dsalinty and maintansive in management is These somewhat poorly drained, nearly level soils are Furrow, border, and sprinkler irrigation systems are Productivity in areas on.low alluvial fans or fan terraces where suitable. Returning crop residue to the soils or regular) C , ripping, cutting, or filling has altered the landscape. adding other organic material im roves f Y P fertility w , �