Section 31--
insert--
'(4) Despite subsection (1), the holder need not keep a sample (the new sample) from a coal seam gas well if, on written application by the holder, the chief executive exempts the holder from having to keep the new sample because--
(a) the holder has previously lodged a sample, or part of a sample, (the previous sample) from the same coal seam gas well, or another coal seam gas well drilling the same seam or structure; and
(b) the new sample has similar properties to the previous sample.'.