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III IIIIIIIIIIIIIIII <br />MINED LAND RECLAMATION DIVISION <br />Department of Natural Resources <br />1313 Sherman St.. Room 215 <br />Denver, CO 80203 <br />303 8663567 <br />Fn x: 303 8328106 <br />OF ~G(p <br />tip-'. ~\i <br />~r ,t <br />~,~~ <br />.. .. v. <br />~,i,.~: <br />re ]e <br />Roy Ramer <br />Governor <br />Fetl R Banta. <br />Drvrs~o~ Dire^mr <br />DATE: June 7, 1990 <br />T0: Carl Mount ~~~///,,,{{{""" ~~, <br />FROM: Cathy Begej ~'Cc.q v~ <br />RE: Hydrologic Sampling alt <br />Seneca II, May, 1990, C-80-005 <br />Water quality data was obtained three spoils springs at Seneca II following <br />our spring hydrology inspection: Spoils Spring 5, Spoils Spring 6 and <br />Spoils Spring 9. Spoils Spring 5 is the discharge from the Pecoco <br />Impoundment, Spoils Spring 6 drains to the north from the Wolf Creek Pit and <br />Spoils Spring 9 erupted last year between the Wadge Pit and Pond 008. <br />All samples exhibited moderately alkaline, hard, saline, calcium sulfate <br />water. Gravimetric TDS levels ranged from a low of 1438 mg/1 at Spoils <br />Spring 9 to a high of 3046 mg/1 at Spoils Spring 5. This high result was not <br />expected as Spoils Spring 5 had a higher percentage of dilution from surface <br />water runoff. Water quality standards for domestic, agricultural (stock), and <br />irrigation uses of manganese were exceeded by the sample from Spoils <br />Spring 9. Manganese concentrations were not measured in the other two <br />samples, but it is likely that they would exhibit exceedances also. The <br />domestic standard for sulfate was exceeded by all samples. <br />Spoils Spring 5 had been monitored <br />values were comparable with ranges <br />been monitored once, on October 2, <br />was significantly more saline than <br />periodically by PCC and our water quality <br />observed in the past. Spoils Spring 6 had <br />1986, and our sample had more sulfate and <br />observed previously. <br />Laboratory quality control was acceptable as evidenced by the cation/anion <br />balance values (less than 5.44%) and the comparison of gravimetric and <br />calculated TDS concentrations. MLRD field values of conductivity and those <br />measured by the lab were moderately close. Interestingly enough, the sample <br />obtained earliest in the day, immediately after we calibrated our equipment, <br />was furthest off (22%). <br />/ern <br />STATE OF COLORADO <br />7824E <br />