For land application of biosolids, yield of vegetation or crop rather than disposal of the material, is the primary objective. Probably the most useful single source of information for initially determining site suitability for land application is provided by soil surveys. These are generally available for the soils used most intensively (i.e., in agricultural production). They provide detailed soil maps on a photographic background, a general soil map, soil description by series and mapping unit, data on drainage and agronomic properties of soils and interpretive tables. Soil surveys are prepared by the Soil Conservation Service in cooperation with agricultural experiment stations and local government units. Experienced agricultural professionals (e.g., soil scientists, agronomists) use soil surveys extensively to identify potential sites that meet regulatory and agronomic requirements for land application of biosolids.