However, in the Lower Fraser (below Hope), the situation is very to runoff sources •. Urban growth, and especially the increase in motor vehicle traffic, tends to increase the amount of urban runoff and the variety of contaminants it contains. [...] For example, history of development in the Brunette lead concentrations reached watershed, from forestry, to agriculture, to a peak in 1973 and have residential, commercial, and industrial, has declined since then, in part because of the gradual adoption 13 U R B A N. I S S U E S F r a s e r. R i v e r. A c t i o n. P l a n Storm sewers have made the Brunette system a sink for pollutants. [...] The through the estuary than the main channel three massive plants in the Fraser estuary upstream, the backwaters of the estuary - Annacis Island, Lulu Island, and Iona were prime habitat for fish. [...] A study at the District of Hope identified measures to get the most out of the current The 1988 extension of the Iona outfall dif- treatment plant and recommended upgrades. [...] Oxygen in the water above the sediments has recovered from the low levels experienced when the outflow As populations grow, so do the benefits of was on the bank.