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TABLE 4 • <br />Comparison of 1991 Surface Water Quality with <br />Historic (1980-1990) Levels far Parameters Whose <br />Historic Levels Yare Exceeded During 1991 <br />Parameter SW-N1 SN-N3 SN-N7 NPDES 001 NPDES C06 <br /> <br />Al (mg/l) 3-17/0.36 <br />1 <br />As (ug/l) 5/2 4/2 <br />1 <br />Ba (ug/l) 110/70 <br />1 <br />Zn (mg/l) .04/.01 .05/,02 .08/.01 <br />2 <br />Alk (mg/l) 458/436 <br />2 <br />Bicarb (mg/l) 549/532 <br />3 <br />Fe (mg/l) 3.58/2.38 <br />2 <br />Mg (mg/l) 232/2:'.5 <br />3 <br />Mn (mg/l) 1.19/1.06 <br />2 <br />Na (mg/L) 96/86 79/72 81/72 <br />2 <br /> <br />1 <br />Metets expressed es to tel recd ve tables <br />2 <br />Constituents expressed as dissolved <br />3 <br />Metals expressed as totals <br />118/110 Maximum 1991 concentration/maximum historic concentration <br />• <br />10 <br />