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1•'a/TSS -Ratios of 1?.^:TSS (ur~mg) r.ere much lo•~~r than for Fe~T:,S but ~,em <br />also quite variable. The total range for all P;orth Fo.-k stations was 0.01-210 <br />(e_:cluding TSS vz_lues of one or less), l,s r,~ith Fe~TSS values, tae late i•;ay--late <br />J.u~e period uas low and also was very cersistert (range C.Ol-0.04). Dining the <br />remainder of the sarpliag period ti1-' nid-Goober the 2n~TS5 values ragged from <br />0.4-163. <br />Differences in P~ TSS ratios were apparent betr:een the upper stations (°r-la <br />and -Zb) and lower stations (":r-3a and -L:a) during part of September and October, <br />reflecting exceptionally high manganese values at these tti:o stations. Fxclucing <br />these hic,~, manganese periods the P'n~TSS value_ ranged from 0.4-32 rather than a <br />high of 163. <br />PSn~TSS ratios ir. ?•:innesota Creek ra.^.ged frcm 1.6-10.5 du:zng the ~.u~:s:,-- <br />October period (excluding TSS values of one or less). <br />( :• <br />Cc:-~aris ors <br />T'nere are no extensive t~~TSS values from previous periods fcr co-,pariscn. <br />Limited data from the ldorth Fork showed a range of 0.5-39 r-^~'. Sron Stevens GL1ch <br />a range of 0.07-1.C7. <br />Si~ificance <br />As with iron, tY.ere was no clear and consistent relationship between manganese <br />and TSS. However, it was apparent that whatever Sector caused a low ratio for iron <br />in Pray and June also ai'fected total manganese levels in the same direction. High <br />ratios of P:n~TSS at stations "~-3a and -4a during October reflected a source of <br />manganese originating in the area bett:een idr'-Zo azxi -ja and map possibly- be related <br />to sand and gravel operations in. the x-iver. <br />• <br />3_ z9 <br />