Gee, do I sense a name and home state match here...? ;-)
(Do they still make the old Goodyear "Metro Miler" city bus tires that are rated for 50 MPH Max? Because LA Metro used to put them on all their equipment, including the "Freeway Express" buses bombing along at 70 in traffic with a full load...)
Oh, and another reason to collect and reuse the filling solution and not to 'just dump it' is the environmental damage it would cause - Calcium Chloride in concentrations like that is not going to be good for the flower beds next to your driveway, and the City/County/State is going to object to it going into a stream or dumped in the sewers so the local sewer treatment plant has to deal with it.
And SWMBO is NOT going to be amused when you create a huge dead zone where not even weeds grow in the yard. And she will be positively livid when you have to dig out the top foot of soil and pay a fortune to cart it off to a Hazmat dump site, and then pay even more to truck in fresh topsoil.
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