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One commenter suggested that design criteria developed at a State level might be very useful , especially to small operators , and that OSM should make this point in the preamble to the hydrology rules . One commenter felt that OSM was expressing a preference for " wet seals . Commenters noted that OSM asserted in the preamble to the proposed rules that MSHA 's current regulatory scheme does not sufficiently address public safety during emergency situations . 780.21 ( a ) , that OSM inspectors , contractors and others be required to follow the prescribed procedures and methodologies as well as to make split samples available to operators and to file them for verification of their quality .