The fate and effect of sodium chloride applied to Californian highways in the Lake Tahoe, Truckee River, and Yuba River watersheds were studied over a period of 14 months in 1974-75. rhloride levels in streams below major frceways were found to be elevated during the winter. The high chloride levels occurred after the Application of salt to roads, decreasing as the time from application mxeases. Small lakes receiving runoff from major highways were also cnrichcd with chloride. Several of these lakes displayed a temporary :hemocline, which was sufficiently strong to stabilize a temperature ;iivcrsion in one Inke.
Four algicides (copper citrate, copper ethanolamine, simazine, and diuron) were tested for effectiveness using in situ bio‐assays. Bioassays were conducted in clear polyethylene bags and algicide effectiveness measured by chlorophyll a, productivity, and algal counts. The body of water where this testing took place had a high pH (9.2), and high levels of total dissolved solids (610 mg/l) and nutrients. The order of effectiveness found in this study was simazine > diuron > copper ethanolamine > copper citrate.
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