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Table 2: Baseline groundwater quality (data from page 2.04.7 -17) <br />Parameter Baseline Baseline Baseline Most stringent standard from tables 14 <br />max min mean 2!F . 41, for reference only <br />H 8.85 6.2 7.8 6.5 -8.5 <br />Conductivity @ 25degC <br />mhos/cm <br />3290 <br />24.5 <br />2780 <br />210 <br />10 <br />156 <br />1386.8 <br />15 <br />941.5 <br />(1.25 x background) <br />Temp (d C) <br />TDS (mg/L) <br />Bicarbonate (mg /L) <br />830 <br />150 <br />419.7 <br />139 <br />1.07 <br />25.2 <br />Ca (mg/L) <br />161 <br />3.2 <br />47.6 <br />CI (mg/L) <br />250 <br />21 <br />0 <br />4.4 <br />Mg (mg /L) <br />N, ammonia (mg /L) <br />19.8 <br />0 <br />3.3 <br />24.8 <br />0 <br />N nitrate /nitrite (mg /L) <br />2.5 10 <br />0 <br />P, ortho (mg/L) <br />8.1 <br />0.6 <br />P, total (mg/L) <br />Na (mg /L) <br />980 1 <br />28.5 <br />328.4 <br />863 <br />9.75 <br />SO4 (mg/L) <br />305.1 250 <br />0.000 0.010 <br />0.001 0.005 <br />1.025 0.300 <br />As m <br />0.002 <br />0.000 <br />0.000 <br />Cd (mg/L) <br />0.010 <br />Fe m 24.200 <br />0.000 <br />Mn (mg /L) 0.980 <br />0.000 <br />0.072. 0.050 <br />H (mg/L) 0.003 <br />0.000 <br />0.000 0.002 <br />Se (mg/L) 0.032 <br />0.000 <br />- - - -- - - - - - --- - - <br />0.003 0.020 <br />0.000 <br />Zn m 0.272 <br />0.051 2.000 <br />The four groundwater monitoring points in the approved water monitoring plan can be loosely <br />described as: (i) up- gradient, MW23; (ii) down - gradient, MW65; (iii) in the mine workings, <br />MWNW and; (iv) surrounded by mine workings, MW 16. It is likely however that groundwater <br />flows to date have been towards the mine workings from MW65, so data from that well does not yet <br />include water that has been in contact with the mine workings. Furthermore, since no data has yet <br />been reported from MWNW the quality of water within the mine cavity cannot be assessed. Taking <br />these two points into account, the only water quality trends that could yet be assessed are up- <br />gradient of the mine. <br />14 <br />