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Sand and Gravel Source (ENG--1) <br />This table gives information about the soils as potential sources of gravel and sand. Normal compaction, minor <br />• processing, and other standard construction practices are assumed. <br />Sand and gravel are natural aggregates suitable for commercial use with a minimum of processing. They are <br />used in many kinds of construction. Specifications for each use vary widely. Only the likelihood of finding material <br />in suitable quantity is evaluated. The suitability of the material for specifc purposes is not evaluated, nor are <br />factors that affect excavation of the material. The properties used to evaluate the soil as a source of sand or <br />gravel are gradation of grain sizes (as indicated by the Unifed classifcation of the soil), the thickness of suitable <br />material, and the content of rock fragments. If the bottom layer of the soil contains sand or gravel, the soil is <br />considered a likely source regardless of thickness. The assumption is that the sand or gravel layer below the <br />depth of observation exceeds the minimum thickness. The ratings are for the whole soil, from the surface to a <br />depth of about 6 feet. <br />The soils are rated good, fair, or poor as potential sources of sand and gravel. A rating of good or fair means that <br />the source material is likely to be in or below the soil. The bottom layer and the thickest layer of the soils are <br />assigned numerical ratings. These ratings indicate the likelihood that the layer is a source of sand or gravel. The <br />number 0.00 indicates that the layer is a poor source. The number 1.00 indicates that the layer is a good source. <br />A number between 0.00 and 1.00 indicates the degree to which the layer is a likely source. <br />• <br />r <br />L_J <br />USA Natural Resources <br />Tabular Data Version: 3 <br />Conservation Service Tabular Dala Version Date: 04127/2005 Page 2 <br />3H <br />