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Source of Sand and Gravel---Weld County, Colorado, Northern Part Koskie Pit 2020 Amendment <br /> Source of Sand and Gravel <br /> This table gives information about the soils as potential sources of gravel and <br /> sand. Normal compaction, minor processing, and other standard construction <br /> practices are assumed. <br /> Sand and gravel are natural aggregates suitable for commercial use with a <br /> minimum of processing. They are used in many kinds of construction. <br /> Specifications for each use vary widely. Only the likelihood of finding material in <br /> suitable quantity is evaluated. The suitability of the material for specific purposes <br /> is not evaluated, nor are factors that affect excavation of the material. The <br /> properties used to evaluate the soil as a source of sand or 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 sand or gravel, the soil is considered a likely source regardless of <br /> thickness. The assumption is that the sand or gravel layer below the depth of <br /> observation exceeds the minimum thickness. The ratings are for the whole soil, <br /> from the surface to a depth of about 6 feet. <br /> The soils are rated good, fair, or poor as potential sources of sand and gravel. A <br /> rating 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 sand or <br /> gravel. The number 0.00 indicates that the layer is a poor source. The number <br /> 1.00 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 /> Information in this table is intended for land use planning, for evaluating land use <br /> alternatives, and for planning site investigations prior to design and construction. <br /> The information, however, has limitations. For example, estimates and other data <br /> generally apply only to that part of the soil between the surface and a depth of 5 <br /> to 7 feet. Because of the map scale, small areas of different soils may be <br /> included within the mapped areas of a specific soil. <br /> The information is not site specific and does not eliminate the need for onsite <br /> investigation of the soils or for testing and analysis by personnel experienced in <br /> the design and construction of engineering works. <br /> Government ordinances and regulations that restrict certain land uses or impose <br /> specific design criteria were not considered in preparing the information in this <br /> table. Local ordinances and regulations should be considered in planning, in site <br /> selection, and in design. <br /> Report—Source of Sand and Gravel <br /> [Onsite investigation may be needed to validate the interpretations in this table <br /> and to confirm the identity of the soil on a given site. The numbers in the value <br /> columns range from 0.00 to 0.99. The larger the value, the greater the likelihood <br /> that the bottom layer or thickest layer of the soil is a source of sand or gravel] <br /> i SDA Natural Resources Web Soil Survey 3/24/2020 <br /> Conservation Service National Cooperative Soil Survey Page 1 of 2 <br />