The operator shall be required to backfill stripping pits in the following manner:
Provided, however, That any permit issued subsequent to the effective date of this amending act shall not require restoration or backfilling of any anthracite coal stripping pit stripped, affected or created prior to the effective date of this amending act to other than the requirements of legislation applicable on the date of such prior stripping.
The permit shall also specify the distance to which the bottom of the spoil banks made by the strip mining operation may approach any stream of water having a well defined channel. Such distances shall be fixed by the department at such number of feet as in the judgment of the department, after consultation with the Water and Power Resources Board, taking into consideration the character of the overburden, is necessary to protect the channel of the stream.
Nothing contained in this section shall be construed to prohibit the relocation of any public road, in the manner provided by law, or the change of the course or channel of any stream, in the manner provided by law, upon permit issued by the Water and Power Resources Board.
52 P.S. § 681.11