TABLE 1 
METAL 
CHESAPEAKE 
BAY 
TRIBUTARIES 
"AVERAGE 
RIVER 
WATER 
IRON 
3,250 
3,000 
COPPER 
517 
410 
ZINC 
1,444 
3,000 
CHROMIUM 
551 
380 
LEAD 
307 
310 
ESTIMATED ANNUAL LOADINGS OF FIVE TRACE METALS TO 
CHESAPEAKE BAY FROM ITS MAJOR TRIBUTARIES (IN M 
TONS) IN COMPARISON WITH PREDICTED LOADINGS IN THE 
SAME QUANTITY OF WORLD-WIDE, "AVERAGE" RIVER WATER. 
50 
