Valves, valve boxes and hydrants shall be installed where shown on the drawings and directed by the engineer and shall be set plumb. Valves shall have interior cleaned of all foreign matter before installation. Stuffing boxes shall be tightened and the valves shall be inspected in open and closed position to ensure that all parts are in working condition. Valve boxes shall be provided for all valves, and shall be Sigma Corporation two-piece VB 266 Screw-type cast iron systems with drop style lid. Valve boxes shall be seated on Adaptor Inc. Multi-Fit Adaptor sized for the specific valve, or approved equivalent. Fire hydrants and valves shall be installed with concrete blocks per detail SD-19 and SD-20 for the support of valves, bends and tees. Not less than seven cubic feet of pea gravel or concrete stone shall be provided at the base of the hydrant to dispose of water from self-draining hydrants. Hydrant installation shall have a six-inch mechanical joint branch, holding spool, six-inch mechanical joint gate valve, holding spool and hydrant with six-inch mechanical joint inlet. Hydrants shall be so installed that the break-away ring shall be set at an elevation that is six inches above the existing or proposed top of curb at the hydrant location to an elevation established by the engineer. Valve locations must be marked with a four inch by four inch “X” saw cut on curb and the sawcut area shall be spray painted blue.