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114 Soil Survey annual cropping, the best suited cropping system is one apth of 12 to 20 inches and are in landscape that includes small grain and summer fallow. po ions similar io those of the San Joaquin soil. Maintaining crop residue on or near the surface helps to Incl ed areas make up about 15 percent of the total Prevent excessive runoff and helps to maintain filth and acre e. the organic matter content. Per eability is very slow in the San Joaquin soil. If this unit is used for homesite development, the Availab water capacity is very low. The shrink-swell main limitations are depth to the very slowly permeable potentia is high. The effective rooting depth is limited claypan and hardpan, the high shrink-swell potential, by the h dpan at a depth of 20 to 40 inches. Roots are and low strength in the claypan. On sites for septic tank restricted o cracks and the faces of peds in the absorption fields, the very slow permeability can be claypan, w ich is at a depth of 10 to 20 inches. Water overcome by increasing the size of the absorption field, is briefly pe hed above the claypan and hardpan after backfilling the trench with sandy material, and installing periods of h vy rainfall or irrigation. Runoff is slow or long absorption lines. Ripping the hardpan improves medium, and he hazard of water erosion is slight or permeability and thus also improves the suitability of the moderate. Th rate of water intake in irrigated areas is soil for septic tank absorption fields. Excavation for 1.5 inches per our. buildings is limited by the hardpan. Properly designing 'Most areas a used for livestock grazing. A few foundations and footings and diverting runoff away from areas are used f irrigated vineyards, irrigated pasture, buildings help to prevent the structural damage caused or dryland grain c ps. This unit may provide wetland by shrinking and swelling. Properly designing buildings functions and valu . These should be considered in and roads can offset the limited ability of the soil to plans for enhancem nt of wildlife habitat or land use support a load. conversion. This map unit is in capability unit IVs-3 (MLRA-17), Where this unit is ed for livestock grazing, general irrigated and nonirrigated. It is in vegetative soil group management consider ions Include saturated soil D. conditions in concave a as following rainy periods and the hazard of erosion. T characteristic plant S10112 7—San Joaquin sandy loam, 2 to 5 percent community is mainly soft hess, ripgut brome, foxtail This moderately well drained, undulating soil is fescue, and filaree. Grazin should be delayed until the on disc ted terraces. It is moderately deep to a soil is firm enough to withst nd trampling by livestock hardpan. formed in alluvium derived from granitic rock and the more desirable fora plants have had an sources. T native vegetation is mainly annual opportunity to set seed. Graz g should be controlled so grasses, for and scattered California white oak. that desirable vegetation, suc as soft chess, is Slopes occur a a complex of plane and convex side maintained and enough vegeta 'on is left standing to slopes and conc a drainageways. Elevation is 20 to protect the soil from erosion. 150 feet. The aver a annual precipitation is about 16 This unit is suited to irrigated 'neyard crops. The inches, the average nual air temperature is about 61 main limitations are depth to the ry slowly permeable degrees F, and the av age frost-free period is about claypan and hardpan and the very w available water 275 days. capacity. General management con iderations include Typically, the surface la er is brown sandy loam the hazard of erosion. Because of th restricted about 10 inches thick. The r part of the subsoil is a permeability, water applications shoul be regulated so claypan of brown clay about 1 inches thick. The lower that the water does not stand on the s rface and part to a depth of 60 inches is a rown and light brown, damage the crops. The hardpan limits t e suitability for indurated hardpan. In some area he surface layer is deep-rooted crops. Where feasible, dee ripping of this fine sandy loam. restrictive layer can help to overcome thi limitation. A Included in this unit are small area of Bruella and tillage pan forms easily if the soil is tilled hen wet. Rocklin soils on the slightly higher terra es, Jahant soils Chiseling or subsoiling breaks up the pan. ecause the in landscape positions similar to those of a San soil is droughty, applications of irrigation wa r should Joaquin soil, Madera soils in the slightly to r positions, be light and frequent. Sprinkler and drip irrig ion and San Joaquin soils that have slopes of 0 2 or 8 to systems are suitable. They permit an even, c trolled 15 percent. The areas where slopes are 0 to 2 ercent application of water, help to prevent excessive unoff, are on toe slopes, and the areas where slopes a 8 to and minimize the risk of erosion. All tillage sho d be on 15 percent are on narrow embankments. Also incl ed the contour or across the slope. If the soil is plo ed in are small areas of Redding soils that have slopes o fall, runoff and erosion can be controlled by apply g to 8 percent and are on the slightly higher terraces an fertilizer and seeding a cover crop. Returning crop moderately coarse textured soils that have a hardpan at residue to the soil or regularly adding other organic'