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Calcium Carbonate (CaC03)-San Miguel Area, Colorado, Parts of Dolores, <br />Montrose, and San Miguel Counties <br />Calcium Carbonate (CaC03) <br />J-Bird Mine Site <br />Calcium Carbonate (CaC03)- Summary by Map Unit - San Miguel Area, Colorado, Parts of Dolores, Montrose, and San <br />Miguel Counties <br />Map unit symbol Map unit name Rating (percent) Acres in AOI Percent of AOI <br />108 Wrayha stony clay loam, 3 8 7.3 100.0% <br /> to 40 percent slopes I <br />Totals for Area of Interest 7.3 100.0% <br />Description <br />Calcium carbonate equivalent is the percent of carbonates, by weight, in the fraction <br />of the soil less than 2 millimeters in size. The availability of plant nutrients is <br />influenced by the amount of carbonates in the soil. <br />For each soil layer, this attribute is actually recorded as three separate values in <br />the database. A low value and a high value indicate the range of this attribute for <br />the soil component. A "representative" value indicates the expected value of this <br />attribute for the component. For this soil property, only the representative value is <br />used. <br />Rating Options <br />Units of Measure: percent <br />Aggregation Method. Dominant Component <br />Aggregation is the process by which a set of component attribute values is reduced <br />to a single value that represents the map unit as a whole. <br />A map unit is typically composed of one or more "components". A component is <br />either some type of soil or some nonsoil entity, e.g., rock outcrop. For the attribute <br />being aggregated, the first step of the aggregation process is to derive one attribute <br />value for each of a map unit's components. From this set of component attributes, <br />the next step of the aggregation process derives a single value that represents the <br />map unit as a whole. Once a single value for each map unit is derived, a thematic <br />map for soil map units can be rendered. Aggregation must be done because, on <br />any soil map, map units are delineated but components are not. <br />For each of a map unit's components, a corresponding percent composition is <br />recorded. A percent composition of 60 indicates that the corresponding component <br />typically makes up approximately 60% of the map unit. Percent composition is a <br />critical factor in some, but not all, aggregation methods. <br />USDA Natural Resources Web Soil Survey 2.1 12/24/2008 <br />i Page 3of4 <br />Conservation Service National Cooperative Soil Survey