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Soil Information for All Uses <br />Suitabilities and Limitations for Use <br />The Suitabilities and Limitations for Use section includes various soil interpretations <br />displayed as thematic maps with a summary table for the soil map units in the selected <br />area of interest. A single value or rating for each map unit is generated by aggregating <br />the interpretive ratings of individual map unit components. This aggregation process <br />is defined for each interpretation. <br />Construction Materials <br />Construction materials interpretations are tools designed to provide guidance to users <br />in selecting a site for potential source of various materials. Individual soils or groups <br />of soils may be selected as a potential source because they are close at hand, are the <br />only source available, or they meets some or all of the physical or chemical properties <br />required for the intended application. Example interpretations include roadfill, sand <br />and gravel, topsoil and reclamation material. <br />Gravel Source (Western Gravel LLC (Phase 1)) <br />Gravel consists of natural aggregates (2 to 75 millimeters in diameter) suitable for <br />commercial use with a minimum of processing. It is used in many kinds of construction. <br />Specifications for each use vary widely. Only the probability of finding material in <br />suitable quantity is evaluated. The suitability of the material for specific purposes is <br />• not evaluated, nor are factors that affect excavation of the material. <br />The properties used to evaluate the soil as a source of gravel are gradation of grain <br />sizes (as indicated by the Unified classification of the soil), the thickness of suitable <br />material, and the content of rock fragments. If the bottom layer of the soil contains <br />gravel, the soil is considered a likely source regardless of thickness. The assumption <br />is that the gravel layer below the depth of observation exceeds the minimum thickness. <br />The ratings are for the whole soil, from the surface to a depth of about 6 feet. Coarse <br />fragments of soft bedrock, such as shale and siltstone, are not considered to be gravel. <br />The soils are rated "good," "fair," or "poor" as potential sources of gravel. A rating of <br />"good" or "fair" means that the source material is likely to be in or below the soil. The <br />bottom layer and the thickest layer of the soils are assigned numerical ratings. These <br />ratings indicate the likelihood that the layer is a source of gravel. The number 0.00 <br />15 <br />