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Detailed information on the soils in the Trapper Mine are presented in the <br />Soils Section, 2.6. A discussion of overburden characteristics is included <br />in Section 2.7.2. <br />These sections should be reviewed for details of the chemistry of the soils <br />in the area. Analyses of the subsoils from some of the monitoring well <br />cuttings were made. Table 2.7-24 presents these results. Quality of <br />groundwater flowing through these materials caill not be a problem. <br />Agricultural Practices <br />Agricultural land use of the study area is shown on Map 35B. The map <br />demonstrates that unirrigated wheat is grown on the majority of the cropland. <br />Some areas are in perennial crops, mainly alfalfa and grass hay. Approxi- <br />• mate areas in unirrigated wheat ate 1864 acres in Flume Gulch, 656 acres in <br />Pyeatt Gulch, 725 acres in Johnson Gulch and 375 acres in No Name Gulch. <br />Perennial crops are grown in Flume Gulch and on approximately 63 acres in <br />Pyeatt Gulch. The area of fill in No Name Gulch is small and is used for <br />unimproved rangeland, while some adjacent lands are used for the unirrigated <br />wheat. It is, therefore, removed from further consideration as a potential <br />AVF. Depths to water of 5.5 and 20 feet are used as guidelines to determine <br />if an area has potential for subirrigation for wheat or alfalfa, respectively. <br />Surface Ida ter <br />Flood irrigation as a regional practice was evaluated using the land-use map <br />for Moffat County. Irrigation normally occurs from perennial drainages by <br />stream diversion. Practices such as irrigation dams are not feasible and <br />%~~ are not used in ephemeral drainages. This is confirmed in a letter from the <br />2-536 <br /> <br />