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I L San Joaquin County, California 71 Ldamage the crops. The hardpan limits the suitability for small areas of Hollenbeck soils that are occasionally deep-rooted crops. Where feasible, deep ripping of this flooded. Included areas make up about 15 percent of Lrestrictive layer can help to overcome this limitation. the total acreage. The soil should be cultivated only within a narrow range Permeability is slow in the Hollenbeck soil. Available of moisture content. It is too sticky when wet and too water capacity is high. The shrink-swell potential also is Lhard when dry. Furrow, border, and sprinkler irrigation high. The effective rooting depth is limited by the systems are suitable. Returning crop residue to the soil hardpan at a depth of 40 to 60 inches. Depth to the or regularly adding other organic material improves water table is more than 6 feet. Runoff is slow, and the fertility, minimizes crusting, and increases the rate of hazard of water erosion is slight. The rate of water water intake. intake in irrigated areas is 0.1 inch per hour. The soil is This unit is suited to irrigated pasture. Irrigation water subject to rare flooding, which occurs during years of can be applied by sprinkler and border methods. abnormally high precipitation. Leveling helps to ensure a uniform application of water. Most areas are used as irrigated pasture or for Proper stocking rates, pasture rotation, and restricted livestock grazing. A few areas are used for irrigated grazing during wet periods help to keep the pasture in crops. This unit may provide wetland functions and good condition and protect the soil from compaction. values. These should be considered in plans for If this unit is used for homesite development, the enhancement of wildlife habitat or land use conversion. main limitations are the high shrink-swell potential, the This unit is suited to irrigated pasture. General slow permeability, and low strength. The rare flooding is management considerations include the hazard of _ a hazard. Properly designing foundations and footings erosion. Irrigation water can be applied by sprinkler and and diverting runoff away from buildings help to prevent border methods. Leveling helps to ensure a uniform the structural damage caused by shrinking and swelling. application of water. Seedbed preparation should be on On sites for septic tank absorption fields, the slow the contour or across the slope where practical. Proper permeability can be overcome by increasing the size of stocking rates, pasture rotation, and restricted grazing the absorption field, backfilling the trench with sandy during wet periods help to keep the pasture in good material, and installing long absorption lines. Properly condition and protect the soil from erosion. — designing buildings and roads can offset the limited Where this unit is used for livestock grazing, general ability of the soil to support a load. Houses, roads, and management considerations include the clayey surface streets should be constructed above expected flood layer and excessive shrinking and swelling. The levels. vegetation consists mainly of soft chess, wild oat, and This map unit is in capability units IIs-5 (MLRA-17), filaree. Trampling of the clayey surface layer by irrigated, and IVs-5 (MLRA-17), nonirrigated. It is in livestock when the soil is too wet reduces productivity. vegetative soil group C. Fencing is difficult. Excessive shrinking and swelling of the soil can cause fenceposts to be tilted or removed 174—Hollenbeck clay, 1 to 3 percent slopes. This from the ground. The unit responds well to range moderately well drained, nearly level and gently sloping improvement practices, such as seeding and applying soil is in interfan basins. It is deep to a hardpan. It fertilizer. The plants selected for seeding should be formed in alluvium derived from mixed rock sources. those that meet the seasonal requirements of livestock, Slopes are plane and are incised by many shallow wildlife, or both. After seeding is complete, grazing meandering drainageways. The native vegetation is should be deterred until the plants have set seed. annual grasses and (orbs. Elevation is 130 to 150 feet. This unit is suited to irrigated row and field crops. The average annual precipitation is about 17 inches, The main limitations are the slow permeability and the average annual air temperature is about 60 degrees depth to the hardpan. General management _ F, and the average frost-free period is about 270 days. considerations include the hazard of erosion. Because Typically, the surface layer is dark grayish brown and of the restricted permeability, water applications should brown clay about 32 inches thick. The upper 23 inches be regulated so that the water does not stand on the Of the subsoil is dark grayish brown clay. The lower part surface and damage the crops. The hardpan limits the — 'O a depth of 60 inches is a dark grayish brown, suitability for deep-rooted crops. All tillage should be on sstrongly cemented hardpan. In some areas adjacent to the contour or across the slope. Furrow, border, and andageways, the surface layer is silty clay or fine sprinkler irrigation systems are suitable. Returning crap Y foam. residue to the soil or regularly adding other organic Included' this unit are small areas of Peters and material improves fertility, minimizes crusting, and Fled-so.p"ils on the slightly higher parts of the increases the rate of water intake. _ tancape. 4130 included, in the lower positions, are This map unit is in capability units Ile-5 (MLRA-17),