Seattle's salt-free snow response raises hackles

The Post-Intelligencer (P-I) explains that the rationale for avoiding salt – a policy that dates to the mid-90s – has more to do with protecting the freshwater streams that feed into Puget Sound:

A 2005 study focusing on the Northeast, where massive amounts of road salt are applied annually, found that some streams were one-quarter as salty as sea water, and were killing animals and fish. A second study that year found that the use of rock salt to melt street ice had increased a hundredfold nationally since 1940.

The second study, published in the Proceedings of the National Academy of Sciences, a science journal, concluded:

"In summary, no one is suggesting that society should instantly ban rock salt use. Nonetheless ... there are real, long-term consequences to its use, particularly for freshwater systems and soils. ... A prudent step would be to adopt a 'less is more' policy, reducing the amounts of salt applied and considering alternatives where economically feasible."

But the alternative also has major drawbacks. According to the P-I, city workers have dumped 8,500 tons of sand on city streets, more than has been used in the past three years combined.

All this sand adds up. Another article in the Seattle Times says that sand is actually more likely to harm aquatic life than salt. When the snow melts, the sand washes into waterways, clogging up drainage systems along the way, and making it hard for insects – a key part of the food chain – to cling to rocks.

Also, when sand dries, it contributes to airborne dust concentrations. The Washington Department of Transportation points out that some parts of the state, like Spokane, have had to limit their use of sand because of air-quality concerns.

A balanced response?

Seattle Times blogger Joni Balter says that she generally approves of the Seattle's sodium-free diet, but she says that there must be exceptions:

This is the kind of overbearing government action that turns ordinary, green-friendly yet practical people against environmental ideas.

Current conditions are a once-in-a-decade event. So here we sit, sit being the operative word, trying to get around at the peak of the Christmas shopping season. Businesses that were already struggling are getting pounded by a lack of access. Mayors are remembered fondly - or otherwise - for the way in which they handle a crisis. This, ladies and gentlemen, is a crisis.

The Times also reports that state officials are brewing up a new mix made of recycled ingredients that perhaps everyone can be happy with. The mixture is 75 percent saltwater collected from a cheese factory, 5 percent calcium chloride, and 20 percent de-sugared molasses. The last ingredient helps the mixture stick to roadways.

One transportation official called the new de-icer a "silver bullet." It's currently made at only one site, but transportation officials are considering making it at five more locations so they can supply the stuff to the entire state.

The sooner, the better: weather reports say there is more snow on the way.

Update: On Dec. 31, the Seattle mayor's office announced that it is amending it's no-salt policy.  Now salt will be used to clear roads when snowfall exceeds 4 inches or if ice is predicted.

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