(a) The provisions set forth in section 375-1.6 of this Part shall apply to remedial programs implemented under this Subpart.

(b) The department shall use all best efforts to expeditiously approve, modify, or reject a proposed work plan within 45 days from its receipt or within 15 days of the close of the comment period, whichever is later.

(c) The first work plan shall be submitted no later than 30 days after the effective date of the brownfield site cleanup agreement.