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Table 5. Effect of Reducing Agents on Cr(VI) and Secondary Water Quality Parameters. <br /> Analyte Units Test <br /> GW High ow GW HighGWS-Low GWS-High GWS-Low GWS ig <br /> GW Control GW-Low Fe Fe Cascade Cascade Control Fe Fe Cascade Cascade <br /> Chromium <br /> Hexavalant gg/L 7,900 < 1 < 1 < 1 <1 6,700 700 < 1 1,500 120 <br /> Total Dissolved /L 6,500 1 5,700 5,500 2,300 2,500 5,400 800 <5 1,400 120 <br /> Alkaiinit m as CaCO3 180 < 1 < 1 160 130 160 440 250 120 97 <br /> Conductivity MS 323 625 626 328 337 312 524 521 307 309 <br /> Dissolved Oxygen m /L 87 83 86 77 61 86 7 9 77 75 75 <br /> Metals Dissolved <br /> Arsenic /L <5 <5 <5 <5 <5 <5 <5 <5 1 <5 <5 <br /> Copper L <10 < 10 < 10 <10 < 10 < 10 < 10 < 10 < 10 _< 10 <br /> Iron pg/L 2,600 53,000 97,000 1,500 1,700 2,100 5,700 5,600 1,900 2,200 <br /> Manganese OL < 10 76 140 < 10 12 " < 10 4,200 16,000 1,300 1,500 <br /> Zinc /L <100 <100 < 100 < 100 < 100 < 100 < 100 <100 < 100 < 100 <br /> Methane" m Lheads ace <001 <001 <001 <001 <001 <001 <001 <001 <001 <001 <br /> Nitrogen <br /> Ammonia m /LasN 011 <01 <01 <01 013 <01 <01 <01 <01 <01 <br /> Nitrate m IL as N 33 33 32 33 33 33 1 33 34 33 32 <br /> ORP my 364 486 463 -139 164 358 333 217 130 133 <br /> H pH units 784 212 212 744 732 775 679 662 785 783 <br /> Sulfate m L 37 1,900 2,000 38 39 54 1,800 1,800 49 50 <br /> Temperature C 201 196 195 192 194 199 194 199 191 _192_ <br /> Totai Organic Carbon m /L I < 1 < 1 I <1 22 1 5 2 1 < 1 1 7 1 12 43 --- 1 1 9 <br /> * Methane analyzed in headspace during separate test See Section 2 4 for details <br /> PRIMA Environmental 9 Eval of Reductants <br /> January 19,2005 ATC-Diamond Walnut <br />