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4-7 <br /> <br /> <br /> <br />Canyon) confirm that natural subirrigation is nonexistent <br />in these valleys (see Appendix Bs). All test pits show sandy <br />and gravelly soils extending to a depth of up to ten feet, <br />a very thin horizon of poor topsoil, no traces of mottling, <br />and a very slight increase in moisture of these soils with <br />depth. <br />Side valleys within the southern part of the area do exhibit <br />groundwater, as is found in Boreholes-BH-3 and HH-4 (Appendix <br />Bs) installed in the side valley proposed for the construction <br />of the future refuse pile. It is obvious from these data <br />however, that there is not sufficient water for subirrigation <br />agricultural use, and as shown above, there is not sufficient <br />surface water available by the ephemeral channel to supplement <br />the insufficient groundwater for such purpose. Further, there <br />is no reasonable potential for irrigation of the side valleys <br />from East Salt Creek. <br />For the above reasons none of the side valleys to be impacted <br />have been classified as Alluvial Valley Floors. <br />4.1.3.4.3 Land Use <br />The valley of East Salt Creek has traditionally been used for <br />grazing and limited cropping. The parts o£ the East Salt Creek <br />Valley that have been used for cropping (mostly alfalfa cropping) <br />are indicated on the map. They are rather limited in extent <br />and are concentrated in three areas; just downstream of the <br />irrigation dam constructed below McClane Canyon, around the <br />confluence of Munger Creek and within the southern part of the <br />valley. <br />The remaining parts of the valley of East Salt Creek have been <br />used mostly for grazing, and can be classified as undeveloped <br />rangeland that is not significant to farming. <br />Revised: 10/28/82 <br />