(1) The provisions of this subchapter are intended to establish procedures whereby the benefits to members and beneficiaries under the firemen's relief and pension funds and the policemen's pension and relief funds within the respective municipalities of this state may be increased on an orderly basis without a deterioration of actuarial soundness and are further intended to establish procedures for review and certification in order that the proposed increase in pension and relief fund benefits will not result in a deterioration of actuarial soundness prior to the adoption or implementation thereof.
(2) It is not the intent of this subchapter to repeal or modify any of the existing firemen's relief and pension fund or policemen's pension and relief fund laws of this state, and this subchapter shall be construed to supplement and to be in addition to any of those laws in effect.