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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />96 percent. Thi s i nformati on produces just 15 acre-ft of sedi ment in the <br />reservoir over 50 years. Even this estimate is probably high, because the <br />reservoir is emptied or nearly emptied every year. This type of operational <br />scheme wi 11 reduce trap effi ci enci es and encourage fl ushi ng sediment through <br />the outlet works. <br /> <br />6.0 WATER QUALITY <br /> <br />Water re1 eased from Barnes Meadow Reservoi r is thoroughly mi xed wi th ri ver <br />water prior to diversion into treatment facilities. For the water quality <br />analysis, the station on the Cache la Poudre River near Fort Collins was <br />selected for comparisons with municipal drinking water standards. It is <br />located 11 miles northwest of Fort Collins, just upstream of the North Fork of <br />the Cache 1 a Poudre Ri ver. Records are avai lab 1 e from October, 1979 to the <br />present. Samples were collected monthly and SUbjected to a full range of <br />chemical tests. These data are summarized on Table IV.10. The table shO\~s <br />the range of concentrations for each water quality parameter and its standard, <br />or limit. <br /> <br />Generally speaki ng, water qual i ty for the Cache 1 a Poudre Ri ver is excel1 ent <br />for domestic, municipal, industrial, and agricultural purposes. The water is <br />low in heavy metals and total dissolved solids. The concentrations of <br />nitrogen, sulfate, chloride, and fluoride are also very low. <br /> <br />During the June 16, 1980 and April 30, 1984 water quality analyses, the <br />concentrations of lead were reported as 0.250 and 0.310 mg/1, respectively. <br />The following month, the concentrations were 0.027 mg/1 in 1980 and 0.003 in <br />1984, which is well below the 0.050 mg/1 standard. These high lead <br />concentrations for the station upstream of Fort Collins are substantially <br />higher than subsequent analyses. An analysis of the remaining 58 monthly <br />samples indicates an average lead concentration of only 0.003 mg/1. These two <br />concentrations are about 100 times greater than the average lead concentration. <br />The high lead value could be the result of an unknown isolated event upstream, <br />or equipment problems in the testing laboratory. In any case, Barnes Meadow <br /> <br />1231 H <br /> <br />-36- <br />