Even assuming that it didn't catch fire, that is a lot of gasoline, almost a full large tanker worth. It could have seeped in and destroyed several hundred feet of asphalt pavement...
I need a chemist to explain to me how gasoline (a petroleum product) would destroy asphalt (made in large part with a petroleum product).
I'm not a chemist, but if gasoline pooled over an asphalt roadway, it would slowly dissolve the asphalt cement in the pavement, basically loosening the pavement structure to where it was no longer a solid pavement. Semi-liquid hydrocarbon material between the aggregate stone. Destroyed in the sense that no longer functional as pavement.
Gasoline is a solvent for the asphalt that holds the gravel in asphalt concrete together.
Going to the article, there was a major environmental cleanup --
"DEQ now has to comb through hundreds of pages of data that include exactly what's been done since the accident happened weeks ago. They estimate 5,000 tons of contaminated dirt have been removed from the site."