A. A mortgage payment may not be applied in a manner that would, for any one project, increase the percentage of mortgage payments insured by the authority, except that this paragraph does not apply when insurance payments for any one project may not in the aggregate exceed the lesser of 25% of the original principal amount of the mortgage loan or Loan insurance may not exceed:

(1) In the case of insurance provided pursuant to section 1026-B, $250,000; One hundred percent of the principal amount of the loan made to any borrower including related entities for any of the following types of loans or projects:

(a)__Loans to veterans and wartime veterans, except that the authority may not at any time have, in the aggregate amount of the principal and interest outstanding, loan insurance obligations pursuant to this division exceeding $5,000,000;

(b)__Underground and aboveground oil storage facility projects and projects to install equipment related to the improvement of air quality pursuant to requirements for gasoline service station vapor control and petroleum liquids transfer vapor recovery, except that the authority may not at any time have, in the aggregate amount of the principal and interest outstanding, loan insurance obligations pursuant to this division exceeding $5,000,000;

(c)__Clean fuel vehicle projects, except that the authority may not at any time have, in the aggregate amount of the principal and interest outstanding, loan insurance obligations pursuant to this division exceeding $5,000,000;

(d)__Waste oil disposal site clean-up projects, except that the authority may not at any time have, in the aggregate amount of the principal and interest outstanding, loan insurance obligations pursuant to this division exceeding $1,000,000; or

(e)__The Plymouth waste oil remedial study, except that the authority may not at any time have, in the aggregate amount of the principal and interest