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4-4h <br />performed recently (end of April, 1981) during the period of <br />increased precipitation and snowmelt. A depth to ground water <br />more than 40 feet eliminates practically any possibility of <br />effective subirrigation. <br />The limited extent of the alluvial deposits and their frequent <br />dissection by the erosion of the ephemeral channels make the <br />possibility of agricultural use of these valleys very remote. <br />The logs of four test pits that were excavated in these valleys <br />(test pits TP-1 through TP-3 were excavated in the Munger Can- <br />yon; test pit TP-5 was excavated in the McClane Canyon) confirm <br />that natural subirrigation is non-existent in these valleys. <br />All test p. :: show sandy and gravelly soils extending to a depth <br />up to 10 feet, a very thin horizon of poor topsoil, no traces of <br />• mottling, and a very slight increase in moisture of these soils <br />with depth. <br />We feel that for these reasons none of the side valleys documented <br />at the site can be .classified as an alluvial valley floor. <br />Logs of the test pits are found in Tables 4.1-1 through 4.1-5; <br />and logs of four monitoring wells drilled in the area are shown <br />on Figures 4.1-3 through 4.1-6. <br />CONCLUSIONS <br />__. The strip of alluvial sediments associated with East Salt Creek, <br />as indicated on Figure 4.1-2, can be classified as an alluvial <br />valley floor. Although there are additional alluvial deposits <br />. in the area located in four valleys that form tributaries of East <br />