Revised Present Estimate of Cost: Cp = Co x Ip/Io + CoC where:
Cp = (present) revised cost estimate
Co = (original) cost estimate as filed pursuant to 310 CMR 19.051(5)
Ip = (present) index value
Io = (original) index value at time of filing pursuant to 310 CMR 19.051(5) and where the index is the so-called "Construction Cost Index" published in the periodical Engineering News Record.
CoC = Change in compliance costs as a result of changes in site conditions, changes in law, regulations, permit conditions, judicial or administrative orders or other significant changes.
An owner or operator of a facility shall file with the Department and maintain in current form those documents constituting or evidencing compliance with this requirement within 60 days of determining a revised estimate of the cost of closure or post-closure maintenance of the facility that exceeds by 10% the amount of the applicable approved financial assurance mechanism. In the event that the revised estimate is a biennial estimate determined pursuant to the provisions of 310 CMR 19.051(6), an owner or operator shall make such filing no later than June 1 of the year to which the revised estimate applies.
where:
CE = current closure or post-closure cost estimate
CV = current value of the trust fund
Y = number of years remaining in the pay-in period.
Next payment = (RB-CV) / Y
where RB is the most recent estimate of the required trust fund balance for corrective action [i.e. total costs that will be incurred during the second half of the corrective action period], CV is the current value of the trust fund, and Y is number of years remaining on the pay-in-period.
The letter of credit shall provide that the expiration will be automatically extended for a period of at least one year unless, not later than 120 days before the current expiration date pursuant to the terms of the letter of credit, the issuing institution notifies both the owner or operator and the Department by certified mail of the decision not to extend the expiration date. Under the terms of the letter of credit, the 120 days shall not begin before the date when both the owner and operator and the Department have received notice, as shown by the later return receipt.
310 CMR, § 19.051