(2)If, on such inspection, the opening of the ground is found to be necessary for the prevention or removal of a nuisance, the expenses thereby incurred shall be paid by the owner or occupier of the land or building, but if it is found that no nuisance exists or but for such opening would have arisen, the ground or portion of any building, drain or other work opened, injured or removed for the purpose of such inspection shall be filled in, reinstated, or made good, as the case may be, by the Board or the Chief Executive Officer.