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• <br />TABLE 7 <br />Comparison of 1991 Ground Water Quality with <br />Historic (1980-1990) Levels for Parameters Whose <br />Historic Levels Here Exceeded During 1991 <br /> 1 <br />Parameter <br />Gll-N3 <br />GW-N4R G4-N9 <br />GW-N27 <br /> <br /> EC (field) 3160/2810 6160/5800 3120/(3250) 3420/3180 <br /> pH (field) 6.72/6.66 <br /> Temp (field) 17.1/16.7 <br /> Alk (mg/l) 440/400 <br /> Bicarb (mg/l) 556/540 488/488 <br /> B (ug/L) 290/290 <br /> Ca (mg/l) 430/(447) 567/(580) <br /> Pb (ug/l) 110/20 <br /> Mg (mg/l) 723/(785) 188/(192) <br /> Na (mg/l) 118/110 14/(15) 74/70 <br />• S04_(m9L2_____ ______ __3713[ri305) 168847865)_ <br /> <br />1 <br />All metals expressed as dissolved <br />118/110 Maximum 1991 concentration/maximum historic concentration <br />14/(15) Minimum 1991 concentration/(minimum historic concentration) <br />• <br />15 <br />