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San Joaquin County, California F 71 damage 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 15erce restrictive layer can help to overcome this limitation, the total acreage. p nt of 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 wetand too water capacity is high. The shrink-swell potential also is hard 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 srdered m 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 diverting runoff away from buildings help to prevent border methods. Leveling helps to ensure a uniform he 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 I permeablilt '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 matenaf and installing long absorption lines. Properly condition and protect the soil from erosion. ds€gning buildings and roads can offset the limited Where this unit is used for livestock grazing, general Wability",_„ ..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 kvegetation consists mainly of soft chess, wild oat, and PTh'rs map unit is in capability units lis-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 sor!'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 !I drained, nearly level and gently sloping improvement practices, such as seedingand applying soiE It'.in .erfan�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 ar�d areincised b shallow wildlife, or both. After seeding is complete, grazing �< Y many meandering drainageways. The native vegetation is should be deferred until the plants have set seed. annus! gra$5es and'f.orbs. Elevation is 130 to 150 feet. This unit is suited to irrigated row and field crops. � Eheaverage annual.precipitation is about 17 inches, The main limitations are the slow permeability and $ verage annus! air temperature is about 60 degrees depth to the hardpan. General management �;and the aveCage.frost-free period is about 270 days. considerations include the hazard of erasion. Because �T �yp!�ahY, the surface layer is dark grayish brown and of the restricted permeability, water applications should o°WaY about-32:inches thick. The upper 23 inches be regulated so that the water does not stand on the de uhoil is ark'grayish brown clay. The lower part surface and damage the crops. The hardpan limits the sty Pth o60 inches. is a dark grayish brown suitability for deep-rooted crops. All tillage should be on tairla rnented hardpan. In some areas adjacent to the contour or across the slope. Furrow, border, and arrf8 . BWYSthe surtace layer is silty clay or fine sprinkler irrigation systems are suitable. Returning crop $ � 1h residue to the soil or regularly adding other organic i rthis=unrt are all areas of Peters and material improves fertility, minimizes crusting, and slightly higher parts of the increases the rate of water intake. soncludeci in the lower positions, are This map unit is in capability units Ile-5 (MLRA-17), w I