An Act amending the act of April 27, 1966 (1st Sp.Sess., P.L.31, No.1), known as The Bituminous Mine Subsidence and Land Conservation Act, providing for alternative methods to minimize subsidence damage, for additional protection for surface water, water supplies, perennial streams, surface structures, historic properties and public utilities, for additional measures regarding the restoration or replacement of water supplies, for limitations on defenses in an action for contamination, diminution or interruption of a water supply or damage to a surface structure, for assurance of the adequacy of bond amount to cover subsidence damage, for compilation, analysis and reporting of additional data and for additional duties of the Department of Environmental Protection; and making editorial changes.