Whenever the commissioner pursues remedial action pursuant to section 22a-133e, he shall seek reimbursement of the costs and expenses incurred by requesting the Attorney General to bring a civil action to recover such costs and expenses from the responsible party. The costs and expenses recovered may include but shall not be limited to

1. (1) the actual cost of the remedial action;
2. (2) any administrative costs not exceeding ten per cent of the actual costs;
3. (3) the costs of recovering the reimbursement, and
4. (4) interest on the actual costs at a rate of ten per cent a year from the date such expenses were paid. If a hazardous waste disposal site was negligently caused, the responsible party may, at the discretion of the court, be liable for damages equal to one and one-half times the costs and expenses incurred.

(P.A. 87-561, S. 7, 13.)