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• CMLRB -Exhibit G <br />Water L~formatioa <br />Page I1 <br />594 to 644 in DFMW-1, from 332 to 384 in DFMW-2, 1940 to 2252 in DFMW-3 and 643 to 765 <br />in DFMW~. <br />Gra!t+d WarPr/Cnrfarp Water Ouali(y, C~mP nA ~~ <br />Inorganic analyses of the surface and gnxud water samples irdiraDe that the gaud water samples <br />conhained elevated levels of calcium, and higher hardness concentrations than the surface water <br />samples. Furtlrerrtwre, magnesium, potassium, and sodium corrcerltrations were higher at DFSW-1 <br />than at DFSW-2 and DFSW-3. Trace levels of cadmium, iron, lead, manganese, nracury, and tint <br />were found in some monitoring well samples. Trace levels of iron, lead, manganese, mercury, and <br />tint were detected in the surface water samples. <br />Anion concentrations typically were higher in the ground water samples. Bicarbonate, chloride, and <br />sulfate levels were significantly greater in the monitoring wells than at surface water monitoring <br />locations. Concentrations of nitrates at all surface water and ground water monitoring locations were <br />• less than 0.15 ppm (<O.15ppm). Concentrations of nitrates ranged from 0.16 ppm aY monitoring <br />locations DFSW-2, DFSW-3 and DFMW-1, to <0.10 ppm at DFSW-1 and DFMW-3. pH <br />concentrations for surface and grand water samples ranged from 6.99 to 7.54. Because of the pH <br />concentrations, carbonates were not detected in any of the surface or gourd water samples. Specific <br />conductance, alkalinity, total suspended solids, total dissolved solids and turbidity values were higher <br />in the ground water samples than in the surface wafer samples. <br />Ground Water otality Monitoring Comr,ared rn Drinking Water Standards <br />The CDH Water Quality Commission has established MCLs and monitoring requirements to assess <br />the safety of public water supply. The MCLs refer to several categories of chemicals, physical <br />properties, radiation, and microbiological categories. Many of these parameters have been nested <br />during the quarterly monitoring conducted for the mine permit at Dowe Flats. The physical properties <br />and chemicals were analyzed and the MCLs are listed on Table GA. The quarterly resulu indicate <br />that the groundwater at Dowe Flats meet all requirements for drinking water except for turbidity. The <br />turbity levels in all of the wells exceed the MCL of 1TU. However, the turbidity requirement is <br />reserved for surface water souroes, and the turbidity measured in the wells could possibly be affected <br />by monitoring well construction, well materials, or well development. <br />• <br />