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..- s '.~ S. y' • -a- They also reflect evaluation of soil characteristics, such os slope, that de- termine the ease or difficulty In getting the soil out, Three degrees of Ilmitatlons are used on the interpretation sheet as follows: DEGREE OF SOIL LIMITATION' ' Sllght - Relatively free of Ilmitatlons or Ilmitatlons ere eatlly over- "~ Come. Moderate - Limitations need to bo recognized, but can be overcome with good managerront and careful design. Severn - Llmltatlons are severe enough to make use questionable. The interpretations will not eliminate the need for on-site study, test- ing, and planning of specific sites for the design and construction for speci- fic uses. The Interpretations can be used as a guide to planning more detailed Invostlgatlons and for avoiding undesirable silos for an Intended use. fay using the soil map and interpretations, It Is possible to select sites that have the least Ilmitatlons for an intended use. Many somewhat poorly and poorly drained soils have severe or very severe. Ilmitatlons in their natural condition. These soils, when drained artiflclally :' may only have a Sllght Ilmitatlon. Modern equipment and knowledge make it possible to overcome most of the Ilmitatlons of Bolls for mony urban and~re- creatlonal uses. The degree of the Ilmitatlon and the location of the soli will determine the practlcablllty of developing the soli for the intended.use. No consideration was given in these interpretations to the size and shape of soli areas, nor to, the pattern they form with other soils on the landscape, For example, same very desirable soil areas are too small In size or too Irregular In shape, or their occurrence with less desirable Solis forms .a pattern tea complex to be utilized for the intended use. Although not considered In the Interpretations, those Items should (nfluonco the final selection of n site. Local roads and streets. Tho Ilmitatlon rating given In this column apply to ~,, ~. uae of soils for construction and maintenance of improved local roads and streets that have all-weather surfacing--commonly of asphalt of concrete--and that are ' ' expected to carry automobile traffic all year. Soils are rated for their~follow~ Ing sultabllities: (1) soil dra(nago class, (2) fLooding, (3) slope, (4) depth to bedrock, (5) ASSHO and unified soil classes, l6) shrink-swell potential, (7), susceptibility to frost action, (f1) stonlnoss and rockiness class. Shallow excavations. Those excavations require excavating or trenching to a depth of 5 or 6 feet. Note that Ilmitatlon ratings for shallow oxcavatlons alone, though highly relevant, are insufficient for Interpretations for ulti- mate uses, such as for dwellings with basements, sanitary landfills, cemoterles, and underground ut(Iity linos--sewers, pipelines and cables. In soils used for shallow oxcavatlons, desirable characteristics are good work- ability, moderate resistance to sloughing, gentle slopes, absence of rock out-. crops and big stones, and no flooding hazard,.