Link to the article. Tom Baxter of Friends of the Riverfront gives costs associated with stoning and paving options.
It seems as though the city is leaning on the non-profit to ante up the dough. So I guess if we want pavement, then we should donate to Friends of the Riverfront?
I believe the paving cost is suspect, because at that price we won't have an adequate base. The existing crushed limestone trail fails because the water sits in the stone and doesn't drain away quickly. So paving over that will result in cracking after 1 to 3 years depending on the thickness and quality of the pavement.