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JCA (CONT_) <br /> can be improved by ripping the hardpan to increase permeability. Excavation for building sites is limited <br /> by the hardpan. If buildings are constructed on these soils, properly designing foundations and footings <br /> and diverting runoff away from buildings help to prevent structural damage because of shrinking and <br /> swelling. Buildings and roads should be designed to offset the limited ability of the soils in this unit <br /> to support a load. <br /> The map unit is in capability units IVs-3 (MLRA-17), irrigated and IVs-3 (MLRA-17), nonirrigated. This map <br /> unit is vegetative soil group D. <br /> SAN JOAQUIN COUNTY SOIL SURVEY PRELIMINARY DRAFT 7/90 SUBJECT TO CHANGE <br />