Sewerage Plant guarantee $80,000 - please help

Hi, My brother in law and I just purchased a mobile home park in Virginia. The state wants an $80,000 financial assurance guarantee should we have to close the sewerage plant down! Bank of America wants us to give them the full $80,000(to hold) plus charge us $1,800/year for a promisary note!

We own the park for cash and last year the town assessment was a little over $1 million on the park. Is there a better way to get this assurance for Virginia without actually putting down $80,000 and being charge $1800 a year on top of that?? Thanks