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t'2n~r:nose <br />h.e^L:~ t <br />' • Stevens Gulch -Concentrations of total ran~anese in 5te~~ns Gulch ranked <br />fro•~ l;-13,100 uL~l durinC the period ~.pril-Jcteber, ?97G. /,11 concentrations <br />higher tcan 1000 ug/1 occurred in the late ,',pril-early I:a,• period, with four <br />sar:ples s.ho:.•ing concent,rat,io.^s bet.ree:, 2pprorima`.cl;,- 1E0~ 13,O~J u~/1 and t!?e <br />remaini.^.~ samples rani-inS bet~;een 27-70 ug/1. Data is a•railable on upper stations <br />frog 6pri1 ihrouSh mid-July, tither. runoff in the Gulch essentially ceased. These <br />values ranged fro: 12-50 ug~l for dissolved manganese (one date in early tray) <br />while total manganese concentrations ranked fro~~ L-13,100 ug~l. Comparison of <br />total and dissGl-;ed r.:an~anese sar:.ples taken at the sa-:e time on i,iay 7th ~ho~.:ad <br />a 51T.1f1C2r.`. Dut ".2r1a~Sle pOrtl0n Of the f.'.an~aneSe Y:aS aSSOCi2ted 1;7tn the <br />eUSpendeG sChd pertlOn Of the Sample, <br />~ie mOre l~:atee date Of C1C-:~:ay thrOU ~~; mld-Jul;;' ref leC ;,ed hmlted 21'511- <br />`.• 2b 111 j Gf S4ater to sa,:,ple at 211 satiors. Concentrations cf total manganese <br />during this pericd ranged from 4-870 ug~l and l~rera benerally less than 200 ug~l. <br />Concentration values availatle from mid-i+ugust t`.rcugi~ October v:ere all from <br />stations near the mouth cf Stevens rich and :•eflect groand water plus P:orth Ferk <br />water sources. Concentrations durin3 this pericd r:ere low, ranging fro. ZO-;3 <br />ug~l. <br />Pior~h Forl: -Concentrations o. total ranganese during the period Iiay-October, <br />1970 ranged from <2-j90~ ug~l. Fourteen of the 22 sampling dates showed concen- <br />trations less than 100 ug~l. The highest values r:ere generally found during <br />September and October samples. <br /> Concentrations at the control station and station. i:$'-2'0 (beio:r the coal <br />• loadout area) were unifomly loi~: ( ~50 ug~l) r:hereas station ."•.T~-3b (above the <br />mouth of Stevens C~lch had consiste.^.tly the }:ighest values. Station t1F-4a (below <br />3-24 <br />