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Ecological Site ID Rating Bogish Pit Tables -Ecological Site ID Summary by Map Unit -Logan County, Colorado Soil Survey Area Map Unit Symbol Map Unit Name Rating Total Acres in AOI Percent of AOI 24'. 93itt Altvau complai:; . R072XX062C0 _ - 28.3 60.7 ,'9:AU-25perceattslopes- .= ..` , I08 Stoneham-Cushman R067BY002C0 0.1 O.l complex, 3 to 9 percent slopes 10,9 ,,; 'F~edalmd-Kim R0678YW$CO ' : Ot3 : '1 22:U , vrompl 9 td , ~ . , ~s `'?~ P~~ 118 Wages loam, 0 to 3 R072XYOO1C0 8.0 17.1 percent slopes Description -Ecological Site ID RF~EIVEI~ FEB 1 6 2001 Divlslon of Reclamano~,, Mining and Safety Ecological site [D is an identifier that uniyuely identifies a particular ecological site. An "ecological site" is the product of all the environmental factors responsible for its development. It has characteristic soils that have developed over time throughout the soil development process; a characteristic hydrology, particularly infilvation and runoff that has developed over time; and a chazacteristic plant community (kind and amount of vegetation). "fhe hydrology of the site is influenced by development of the soil and plant community. The vegetation, soils, and hydrology are xll interrelated. Each is influenced by the others and influences the development of the others. The plant community on an ecological site is typified by an association of species that differs from that of other ecological sites in the kind and/or proportion of species or in total production. Descriptions of ecological sites aze provided in the Field Office Technical Guide, which is available in local offices of the Natural Resources Conservation Service (MRCS). Parameter Summary -Ecological Site ID Class: NRCS Rangeland Site Aggregation Method: Dominant Condition Aggregation is the process by which a set of component attribute values is reduced [o a single value that represents [he map unit as a whole. A map unit is typically composed of one or more "components". A component is either some type of soil or some nonsoil entity, e.g., rock outcrop. For the attribute being aggregated, [he firs[ step of the aggregation process is to derive one attribute value for each of a map unit's components. From this set of component attributes, the next step of [he aggregation process derives a single value that represents the map unit as a whole. Once a single value for each map unit is derived, a thematic map for soil map units can be rendered. Aggregation must be done because, on any soil map, map units are delineated but components are not. For each of a map unit's components, a corresponding percent composition is recorded. A percent composition of 60 indicates that the coaesponding component typically makes up approximately 60% of the map unit. Percent composition is a critical factor in some, but not all, aggregation methods. The aggregation method "Dominant Condition" first groups like attribute values for the components in a map unit. For each group, percent composition is se[ [o the sum of the percent composition of all components paructpating in that group. These groups now represent "conditions" rather than components. The attribute value associated with the group with the highest cumulative pemen[ composition is returned. If more than one group shares the highest cumulative percent composition, the cortesponding "tie-break" rule determines which value should be returned. The "tie-break" rule indicates whether the lower or higher group value should be returned in the case of a percent composition tie. t$Q4 nmo.t Bewv<n Web Soil Survey Ll 10/11211116 "~ ravenrbo Serrlre National Cooperuive Soil Survey Page 3 of 4