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• 1100 <br />1000 <br />U <br />900 <br />800 <br />700 <br />O <br />U <br />600 <br />• 500 <br />SPRING (SP-1) <br />1989 1990 <br />YEAR <br />~. <br />--t-- MAY MEASURMENTS <br />f HISTORIC AVERAGE <br />1991 <br />~ SEPT. MEASUREMENTS <br />-~ HISTORIC MAXIMUM <br />1992 <br /> <br />