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1 <br />The topological change in the surface water from a calcium-bicarbonate type to <br />' a calcium-sulfate type has been in existence for several years. However, the <br />same topological shift recently noticed in the alluvial wells appears to <br />coincide with the surface expression of the spiing associated with the spoils <br />aquifer developed along the lower slopes of West Ridge. Although the spzing <br />outflow is surficial in nature, the flow is not sufficient to cause a more <br />pronounced shift in the bicarbonate-sulfate balance in the surface water than <br />currently exists, but appears to exert sufficient influence on the alluvial <br />' waters to cause a shift in the downstream alluvial water bicarbonate-sulfate <br />balance. <br />t From the above relationships it appears the creek water and alluvial water <br />exhibit little influence upon each other due to the slow exchange rate. <br />' However, surface water from sources outside the creek which contact the <br />alluvium in passage to the creek may have an effect on alluvial water. <br />1 <br /> <br />1 <br /> <br /> <br /> <br /> <br />1 <br /> <br />1 <br />1 <br />