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DocuSign Envelope ID: D07924E6-3D94-4398-A066-B683COBAB33E <br /> February 24,2021 <br /> Angela Aalbers,Chantell Johnson <br /> Page 7 of 12 <br /> Reference: Biological Sulfate Reduction Bench-Scale Test Results-Revision 1 <br /> Table 5 - Laboratory Results for 4x and 8x Bench-Scale Test <br /> � I 4x Column 4x Column 8x Column 8x Column <br /> Parameter - 4x Influent 3 Effluent 4 Effluent 3 Effluent uen <br /> Ca(mg/L) 143 - 51.8 - 107 <br /> Mg(mg/L) 115 - 111 - 120 <br /> Mn (mg/L) 0.4 - 0.052 - 0.46 <br /> Na(mg/L) 753 - 744 - 776 <br /> Fe(mg/L) <0.020 - <0.020 - 0.023 <br /> Ammonia as N (mg/L) <0.150 <0.150 <0.150 <0.150 <0.150 <br /> Total Alkalinity(mg/L 1,050 1,380 1,270 1,350 1,460 <br /> as CaCCt3) <br /> Bicarbonate(mg/L as 1,050 1,380 1,210 1,350 1,450 <br /> CaCO3) <br /> Carbonate(mg/L as <1.0 <1.0 52.9 <1.0 14.0 <br /> CaCO3) <br /> P(mg/L) 0.035 0.08 0.046 0.018 0.014 <br /> Dissolved Carbon(mg/L) 1,540 301 526 436 982 <br /> Chloride(mg/L) 30.0 - 30.0 - 29.8 <br /> Nitrate as N (mg/L) 1.61 <0.250 <0.250 <0.250 <0.250 <br /> Sulfate as SO4(mg/L) 1570 - 758 - 528 <br /> WET test samples were collected and sent to GEI Consultants on November 4th. Comparative evaluation of <br /> laboratory and field data suggest that the alkalinity of the samples interferes with nitrate testing method, <br /> preventing adequate pH change for the field test to be accurate. As a result, all field nitrate measurements are <br /> considered suspect and are presented for information only. Field iron measurements were consistently below <br /> detection for the colorimeter testing. <br /> The sample waters observed during testing tended to have a yellow color after collected then turned clear <br /> once pH was reduced as part of the preservation process. Several samples also had white sediment that <br /> settled overtime. Addressing these issues led to the chemistry modifications and Supplemental Testing <br /> discussed below. <br /> Table 6 and Table 7 shows field analytical results for the 1X and 2X bench-scale tests. <br /> Desic th community in mir <br /> dpg llus0321-ppfss01lshared_projects\233001407\reports\6_bench_scale_report\rpLbench_scale_report_24feb2O20_final_rl.docx <br />