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Other suitability tables which describe the factors that affect a particular use and define limits of properties which determine the degree of suitability can be con- structed for many of the following uses: A. Soil limitations for irrigation sprinkler use. B. Soil limitations for drainage. C. Water management characteristics. D. Frost hazard. E. Permeability classification. F. Limitations for embankments. G. Limitations for road construction. I. Pedestrian traffic. 2. Vehicular traffic. 3. Compaction. 4. Road base materials. 5. Backfill materials. 6. Subgrade materials. H. Foundations for buildings. I. Cultivated crops, trees, pasture. J. Residential development with public sewer. K. Residential development with on-site sewage disposal - septic tank fields. L. Light industry and commercial buildings. M, Railroad development. N. Airport development. O. Crop yield tables for different soils. P. Use of soils for woodlands. Q. Use of soils for recreational developments. I. Playgrounds. 2. Picnic areas. 3. Paths and trails. 4. Golf courses. 5. Camp areas. R. Limitations of soils for wildlife species. INTERPRETIVE MAPS The foregoing soil interpretation or rating guides for various uses of soils can be graphically displayed through the preparation of interpretive maps. It should be pointed out that, at present, most soil interpretive information is provided in table form. This section will demonstrate how interpretive maps can be prepared. Interpretive maps can be made directly on the soil photo maps, on enlargements of the maps, or on spe- cially prepared base maps on which the soil mapping boundarles have been delineated. The interpretive maps are prepared based on the same limitation or suitability categories as used in the interpretive tables. The advantage of these maps is that they can create a mental image ofa particular geographic area relative to the distribution pattern of soils and/or suitability pat- tern for a given use. Interpretive maps are usually made for single interpretations, such as suitability for home- sites. Maps usually use a stop.go color code system to desig- nate various limitation or suitability categories. For example, green indicates slight limitation, yellow indicates caution, and red indicates that severe limita- tion for that particular use exists ("stop"). Examples of single-purpose interpretive soils maps are shown in Figure 5, using a detailed soil photo map that has been interpreted for 14 different uses. One example of a single-purpose interpretive soils map is shown in Figure 6, using a base map constructed from a general soil map. These interpretive maps are examples of how a graphic portrayal of detailed and general soils data can provide important inputs io a planning program. Another method of making interpretive maps is to use a pattern instead of color for showing limitations. This allows for lower cost reproductions. This chapter has illustrated how the soil survey and its companion, interpretive analysis, can provide a basic input in various phases of industrial, agricultural, urban, and recreational planning. Soil interpretations alone do not produce a development plan, but they can identify conditions that must be considered to give as- surance for safe and long-time use ofland. It must be emphasized that soil limitations are one of the many factors to be considered in making planning decisions. Only when all the related factors are thoroughly under- stood can a proper land use decision be made. 17