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<br />L'? <br />C) <br />co <br />',1 <br /> <br />. <br /> <br />. <br /> <br />--' <br /> <br />intermittent tributaries. East, Middle, and West Mamm <br />Creeks, all perenni a 1 streams, converge withi n the project <br />area to form Mamm Creek. <br /> <br />No significant groundwater sources have been identified in <br />the project area, although wells in alluvial aquifers near <br />the Colorado River and some of its tributaries produce some <br />water for farm culinary use and irrigation of small tracts. <br />A few low-yielding springs are present. More extensive <br />supplies may be present in deeper bedrock aquifers but have <br />not been identified at this time. <br /> <br />The quality of the Colorado River in the project area is <br />generally good for irrigation, but the concentration of <br />total dissolved solids (TDS) is higher than desirable for <br />municipal use, especially in late summer, fall, and winter, <br />when streamflows are low. During 1977 and 1978 the TDS <br />concentrati on of the river ranged from 170 mi 11 i grams per <br />liter (mg/L) to about 830 mg/L. <br /> <br />The quality of the perennial tributaries in the reaches <br />above the irrigated areas is usually higher than that of the <br />river, and the TDSranges from less than 100 to about <br />200 mg/L. Closer to the river, the quality usually deterio- <br />rates considerably. The TOS concentration often approaches <br />1,000 mg/L because of the pickup of dissolved solids in <br />return flows from agricultural areas, which also results in <br />increased nutrients and coliform bacteria. <br /> <br />The quality of groundwater in the project area is generally <br />marginal. The quality of water from wells that have been <br />ana lyzed ranges from TDS of 300 to over 1,000 mg/L. The <br /> <br />A-8 <br />