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• • • Table 7-4 Groundwater Quality of Aquifers from Additional American Soda Monitoring Wells. Parameter Lower Aquifer (Hole 20-1) Upper Aquifer (Hole 20-5) Alluvial Aquifer (Ho]e 21-2) 1,404 feet 650 feet 95 feet otal A ka imty as CaCO~ /I 27,500 640 768 henol Alkalinity as CaCO, m /I <5 <5 <5 icar ovate (mg ) 33,300 774 929 ar onate(m <5 <S <5 Boron m /1) 7.16 0.216 0.208 Bromide (m /I 5.1 0.1 0.17 dum m 4 62 42 Total Or anic arbon m /1 24.8 33.4 23.5 on e m / 11,500 15 14 onductivi , 2 °C os/cml 75,200 1,960 2,420 uoride m /I 40.5 2.04 0.24 Hardness as CaCO m /p 592 574 760 Hvdroxi e m ) <5 <5 <5 Ma esium (m I ] 42 110 169 Nitrate m /I <0.01 <0.01 0.13 Nitrite (m <0.01 <0.01 <0.01 H (units 8.25 7.5 7.4 os hate m /I 0.41 0.19 0.01 ota P os orous m /) 0.06 0.03 0.45 otassium m /I 337 3.78 3.8 ilica (m /I 75.3 44.5 81.3 'um m / 16,600 208 206 ulfate m /I 85 366 335 fide m / <0.01 0.14 0.10 ota Disso ved So t s m / 61,600 1,210 1, 40 Total Sus ende Solids m /I 71 365 2,330 Aluminum m /I 0.458 0.032 13.9 rsenic m <0.001 <0.001 <0.001 arium m /I) 7.69 0.61 0.2 Beryllium m /) 0.010 <0.001 <0.001 Bismu (m ) 0.011 0.005 0.004 dntium m /I 0.0050 0.0023 0.0004 mium m / 0.023 <0.001 0.017 o er(m 0.001 0.013 0.014 Iron (m /1 5.27 13.3 4.50 Lead m /1 0.077 0.0]5 0.004 Li 'um m /1 8.53 0.07 0.090 Man anew m /I 0.016 0.405 0.910 Merc m /I <0.00005 <0.00005 <0.00005 Molybdenum m /I) 0.300 0.040 0.002 Nickel (m /I 0.008 0.006 <0.002 Seenium m /I 0.003 0.002 0.004 Strontium m 0.05 ].9 3.72 Vanadium m /I 0.050 <0.003 0.008 ' c m I 0.057 0.143 0.109 Anions (me /1 876 20.84 25.32 ations me /I 831 21.27 24.66 Balance 1 % -2.6 -1.0 -1.3 American Soda, L.L.P. Commergal Mine Plan August 18, 1998 7-25