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IP.OIQ <br />Res•~lts <br />• Stevers Gulch -Concentrations of total iror, during the period April to <br /> <br />October ranged lridel}•, Sroro 24-710,000 ug~l. T_ne hi~rest values occurred during <br />the late April to earl;; i.ay period, t;hich acco~.:ntcd for all values above 500 ug~l <br />e.~:cept for a single ~,1ue oS 770 ug~l on June 30th. Raring cid--:ay to October, <br />total iron concentratio.-is vrere lo'.: (2L,-770 ug~l) reflecting loti; ranofS conditicns. <br />Concentrations of dissolved iron taken frcm the same staticrs :here very <br />him total iron ryas fou.~ kere in the order of 1600-fold less (late April) and 1C- <br />500-fold less (1•:ay) tra_n comparable total iron concentrations. <br />North Fork -Concentrations of total iron a.~ri~g the pe:mod F:ay to October <br />ranged Sroc: 1G-17>,CYJO. Tre highest concentrations tire re Source in early 1•iay, <br />si:S~ar to that of Stevers Gulch. Concentrations fcur~ later iz the year ranged <br />~• from lu-x:70 or apprcxirately 2.7J-fold lot;er than early t•:ay values for the highest <br />concentration. Samples frog only tyro dates out of 22 dates sa-~pled exceeded 1000 <br />ug~l for total iron du~~rg the mid-1•!ay to October period. <br />Duz^:ng dates t,•hen iron ccncentrations were high (e.g., 27ay 7) control station <br />values wex~ also hid`:. Sigh concentrations dorzistreaa of the control station (tom-la) <br />were generally less than ;0 greater than the control concentratio.•vs. <br />liinnesota Creek -Sampling in l:iznesota Creek began in August, and total iron <br />concentrations ranged froc 20-100 ug~l. A11 but one of the ten s~pZing dates <br />showed total iron concentrations less than 200 ug~l. The high value oS 101.0 ug~l <br />on Aubvst 7th apparently i^.creased the river le~~ls at mixing station 1:F-4b. <br />• <br />3-21 <br />