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Gravel Source—Pueblo Area,Colorado,Parts of Pueblo and Custer Counties Two Rivers Pit <br /> Description <br /> ENG-Engineering <br /> Gravel consists of natural aggregates(2 to 75 millimeters in diameter)suitable <br /> for commercial use with a minimum of processing. It is used in many kinds of <br /> construction. Specifications for each use vary widely. Only the probability of <br /> finding material in suitable quantity is evaluated.The suitability of the material for <br /> specific purposes is not evaluated, nor are factors that affect excavation of the <br /> material. <br /> The properties used to evaluate the soil as a source of gravel are gradation of <br /> grain sizes(as indicated by the Unified classification of the soil),the thickness of <br /> suitable material, and the content of rock fragments. If the bottom layer of the soil <br /> contains gravel, the soil is considered a likely source regardless of thickness. <br /> The assumption is that the gravel layer below the depth of observation exceeds <br /> the minimum thickness. The ratings are for the whole soil, from the surface to a <br /> depth of about 6 feet. Coarse fragments of soft bedrock, such as shale and <br /> siltstone, are not considered to be gravel. <br /> The soils are rated"good,""fair,"or"poor"as potential sources of gravel.A rating <br /> of"good"or"fair"means that the source material is likely to be in or below the <br /> soil.The bottom layer and the thickest layer of the soils are assigned numerical <br /> ratings. These ratings indicate the likelihood that the layer is a source of gravel. <br /> The number 0.00 indicates that the layer is a poor source.The number 1.00 <br /> indicates that the layer is a good source.A number between 0.00 and 1.00 <br /> indicates the degree to which the layer is a likely source. <br /> The map unit components listed for each map unit in the accompanying <br /> Summary by Map Unit table in Web Soil Survey or the Aggregation Report in Soil <br /> Data Viewer are determined by the aggregation method chosen.An aggregated <br /> rating class is shown for each map unit.The components listed for each map unit <br /> are only those that have the same rating class as listed for the map unit. The <br /> percent composition of each component in a particular map unit is presented to <br /> help the user better understand the percentage of each map unit that has the <br /> rating presented. <br /> Other components with different ratings may be present in each map unit. The <br /> ratings for all components, regardless of the map unit aggregated rating, can be <br /> viewed by generating the equivalent report from the Soil Reports tab in Web Soil <br /> Survey or from the Soil Data Mart site. Onsite investigation may be needed to <br /> validate these interpretations and to confirm the identity of the soil on a given <br /> site. <br /> Rating Options <br /> Aggregation Method:Dominant Condition <br /> USDA Natural Resources Web Soil Survey 12/30/2023 <br /> 411 Conservation Service National Cooperative Soil Survey Page 6 of 7 <br />