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Therefore, iT is believed that the water quality measured at TRI and TR2 is <br />• indicative of seepage toward the stream at these locations. <br />'~`~ <br />~tlge~s~e~-~+e~Fi#~a64ee4~Mhe~we~er~geeFrR+~, and it is observed that the <br />dtl quality is very similar to that in the stream. llFFnviel-weFI~R3-isiocate~d-near <br />t h~we~ -s-.-=-I----.~r~eFy.~+w..tbe..Meftet~-#ea•er~•~•i s-~probabty-1Fr~s1°ind~ico4er <br />e~*~P hate ling,,,yyglit~_ of ,ulluyj,g,I.,.bCa2a1CS.,.1hA~.,~lfly~31„DO}~".fsc-~eeng-af~fee4e~ <br />by~r~renirn~--t+r-M~aF•-preserrtFy"vrntt5Y0Yf7e'd"TmeS. Examination of the monthly data <br />presented in Section 2.5.5 shows Thot the water quality varies very little seasonally. <br />On Oak Creek, the common species sodium, calcium, magnesium and sulfate <br />show a marked increase at OK2 as compared to OKI. We hove no definitive <br />explanation for this observation. The Oak Creek valley between these two stations <br />has been disturbed by roads, railroads, and other activities which have undoubtedly <br />modified The spatial distribution of water quality. Simply the relative proximity of <br />The wells to any such disturbance is a possible explanation. <br />There is a striking difference between total iron and dissolved iron at all of <br />the alluvial monitoring sites. It is believed that this difference is largely dependent <br />upon the quantity of suspended material in the samples collected. The method by <br />• which total iron is measured on an unfiltered sample involves a radical digestion of <br />suspended material with nitric and hydrochloric acid. Thus, all iron that is <br />complexed or attached to sediment particles is measured as total iron. The <br />relationship between total iron and total suspended solids was investigated by <br />correlating the concentration of total iron with the concentration of total suspended <br />solids. A great deal of scatter was observed but a strong correlation showing <br />increasing total iron with increasing total suspended solids was evident. It is <br />concluded, therefore, that the concentration of total iron measured in the alluvial <br />wells is primarily related to the amount of sediment entrained during sampling. <br />Because the suspended solids will not move through the alluvium, one should not infer <br />from these data that the alluvial waters will act as a source for total iron in the <br />streams. <br />As was done for the surface waters, the alluvial water quality data was <br />compared with recommended criteria to assist in placing the data in perspective. <br />These comparisons ore shown in Tables 2.5-IS and 2.5-19. Total iron was not <br />included for the reasons expressed in the previous paragraph. Dissolved iron, <br />manganese and zinc are the only trace elements that frequently exceed the <br />• recommended criteria. <br />Revised 7-81 2.5-75 <br />