Re: has common sense been lost in seattle?
Actually, the description of what is happening does sound like an airport. Salt is not used on the Airside, and hasn't been for decades, because it corrodes the aluminum airplanes badly. What is usually used as a deicer is urea, and yes, its exactly what you think it is. For this use, the form is that of pelletized urine, which is spread with a sand spreader. Sometimes it is even mixed with sand.
The rubber bottomed plow blades also sound like an airport issue - they are used because standard blades would rip the in-pavement runway and taxiway lights right out of the black top or cement.