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• • <br />FIGURE 4•f <br />1200 <br />1000 <br />800 <br />f <br />600 <br />100 <br />200 <br /> STATION $-10 <br /> SURFACE WATER OUALI7Y <br /> SEASONAL VARIATIONS <br /> <br /> <br /> <br /> DS <br /> • <br /> • <br />, SO q <br /> o __ ~ <br /> e - i <br /> - o- - i HC03 <br /> i <br /> <br /> <br /> o ° o <br />J F M A M J J A S O N D J F M A M J J A S O N D J F M A M J J A S O N D J F M A M J J A S O N D J F M A M J J A S O N D <br />19 Q~ 19Q',~ 1986 1987 1988 <br />