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I ' 128 Soil Survey development. This unit may provide wetland functions Typically, the surface layer is grayish brown loamy and values. These should be considered in plans for coarse sand about 28 inches thick. The upper 25 inches enhancement of wildlife habitat or land use conversion, of the underlying material is brown, mottled loamy ' This unit is suited to irrigated row and field crops. coarse sand. The lower part to a depth of 75 inches is The main limitations are the low available water pale brown, mottled loamy coarse sand. In some areas capacity and depth to the hardpan. General the surface layer is loamy fine sand or sandy loam. management considerations include the severe hazard Included in this unit are small areas of Delhi and ' of soil blowing. Because the soil is droughty, Honcut soils or the slightly higher parts of the applications of irrigation water should be light and landscape and Manteca and `veritas soils on the slightly frequent. The high percentage of sand in the soil lower parts. Also included, in landscape positions reduces the amount of moisture available for plant similar to those of the Tinnin soil, are small areas of ' growth. The hardpan limits the suitability for deep- Timor soils and coarse textured soils that have a rooted crops. Where feasible, deep ripping of this medium textured substratum below a depth of 40 restrictive layer can help to overcome this limitation. inches. Included areas make up about 15 percent of the ' Sprinkler and drip irrigation systems are suitable. They total acreage. permit an even, controlled application of water, help to Permeability is rapid in the Tinnin soil. Available prevent excessive runoff, and minimize the risk of water capacity is low. The effective rooting depth is 60 erosion. Careful applications of irrigation water are inches or more. Runoff is slow, and the hazard of water ' needed to prevent the buildup of a high water table. A erosion is slight.The rate of water intake in irrigated tillage pan forms easily if the soil is tilled when wet. areas is 3.0 inches per hour. The hazard of soil blowing Chiseling or subsoiling breaks up the pan. When the is severe. ' wind velocity is high in spring, the hazard of soil Most areas of this unit are used for irrigated crops, blowing can be reduced by properly managing all crop orchards, or vineyards. A few areas are used for residue and by minimizing tillage. homesite deveopment. ' This unit is suited to irrigated pasture. The main This unit is suited to irrigated row, field, orchard, and limitation is the low available water capacity. Because vineyard crops The main limitation is the low available the soil is droughty, applications of irrigation water water capacity General management considerations should be light and frequent. The water can be applied Include the severe hazard of soil blowing, Because the ' by sprinkler and border methods. Leveling helps to soil is droughty, applications of irrigation water should ensure a uniform application of water. Proper stocking be light and frequent. The high percentage of sand in rates, pasture rotation, and restricted grazing during wet the soil reduces the amount of moisture available for ' periods help to keep the pasture in good condition and plant growth. Sprinkler and drip irrigation systems are protect the soil from compaction. suitable. They aermit an even, controlled application of if this unit is used for homesite development, the water, help to prevent excessive runoff, and minimize main limitations are depth to the hardpan and the rapid the risk of erosion. A tillage pan forms easily if the soil ' permeability. The rare flooding is a hazard. Flipping the is tilled when vet. Chiseling or subsoiling breaks up the hardpan improves permeability and thus also improves pan. When the sivind velocity is high in spring, the the suitability of the soil for septic tank absorption fields. hazard of soil blowing can be reduced by properly ' Community sewage systems may be needed because managing all crop residue and by minimizing tillage. seepage from onsite sewage disposal systems can If this unit is used for homesite development, the result in the contamination of water supplies. Houses, main limitation is the rapid permeability. Community roads, and streets should be constructed above sewage systems may be needed because seepage ' expected flood levels. from onsite selvage disposal systems can result in the This map unit is in capability units Ills-4 (MLRA-t 7), contamination of water supplies. irrigated, and IVe-4 (MLRA-17), nonirrigated. It is in This map unit is in capability units Ills-4 (MI-RA-17), vegetative soil group B. irrigated, and lVe-4 (MLRA-17), nonirrigated. It is in vegetative soil group B. 255—Tinnin loamy coarse send, 0 to 2 percent slopes. This very deep, well drained, nearly level soil is 256 Tokay line sandy loam, 0 to 2 percena ' on alluvial fans. It formed in alluvium derived from slopes. This very deep, well drained, nearly level soil is granitic rock sources. Elevation is 20 to 70 feet. The on low fan terraces. It formed in alluvium derived from average annual precipitation is about 11 inches, the granitic rock sources. A few areas are dissected by ' average annual air temperature is about 60 degrees F, intermittent sloughs that have been filled as a result of and the average frost-free period is about 270 days. land leveling. Elevation is 10 to 125 feet. The average