Mo. Rev. Stat. § 229.360: If owner supplies no competent workmen when alteration necessary, work to be done at owner's expense.

It shall be the duty of any person, firm or corporation owning, leasing, or operating any such conduits, poles, pole lines, wires, mains, pipes, conductors, sewers, drains, tramways or other objects, after service of the notice required in section 229.350 to furnish such competent workmen and crews as may be necessary to effect such removal, change or alteration, and to pay all actual expenses which are incurred by any person, firm, corporation or political subdivision in so doing. In making such necessary removal, change or alteration, no other person, firm, corporation or political subdivision shall interfere with or make any such change, removal or alteration until the owner, lessee or operators of such object shall have been notified as provided in section 229.350, and shall have failed or refused to do so within a reasonable time, and in the event of such failure or refusal such work shall be done only by competent and experienced workmen at the cost and expense, however, of the owner, lessee or operators of such object.