(a) Valve chamber bases shall be constructed of formed concrete having a twenty-eight day compressive strength of 3,000 psi.
(b) The walls of the valve chamber shall be made of No. 2 shale brick laid radially in header courses. No broken brick shall be used except in closures and to chink in the exterior radial joints. The top of the valve chamber shall be drawn in and domed concentrically about the vertical axis of the valve chamber to receive the manhole frame casting. The top of the manhole casting and lid shall be set to the exact elevation as called for on the plans. If exact elevations are not given, then the top of the casting and the lid shall be made flush with the existing ground.
(c) Cast-iron manhole frames shall be Neenah Foundry Company, catalog number R- 1370, complete with Type B lids. Lids shall be furnished with the words “WATER VALVE” cast thereon in letters at least two inches in height.
(d) Mortar for joints shall consist of one part Portland cement and two parts of a clean, course mason sand by volume.
(e) Each valve in the valve chamber shall be supported by a formed concrete pad using 3,000 psi concrete as shown on the plans. Concrete support pads shall be placed after the valves are completely in place and at least seven days prior to hydrostatic testing.
(Ord. 352. Passed 10-22-62.)