Section R. 460.860 - Wellhead fittingsRule 10.
(1) Wellhead connections shall be designed and installed in accordance with principles of design and installation illustrated on plate 1A, appendix A, unless specific approval is secured in writing from the chief engineer.(2) Master or control valve shall be installed with valve stem not less than 2, nor more than 4 feet above the ground level, provided that whenever tubing or siphon is installed in any well, the valve and wellhead fitting construction and spacing will necessarily be governed by special conditions in each separate case.(3) Wheels on valves shall be left and secured in place to facilitate emergency opening or closing of valves with an emergency long stemmed wrench or key.(4) A space free from surface obstructions shall be kept clear on the stem or wheel side of each control gate or valve, so that workmen can approach wells and use long stemmed wrenches or keys in opening or closing valves in case of fire.Mich. Admin. Code R. 460.860