The specifications contained in this article
shall govern the installation of all waterworks utilities in the Town
of Marblehead unless otherwise determined by the Board.
Fittings shall be short body mechanical joint,
all bell, cast iron or ductile iron, minimum pressure rating of 250
psi, meeting the requirements of ANSI 21.10-1971 (AWWA C110-71), or
latest revision thereto. Fitting joint shall also meet the requirements
of ANSI A21.11-1972 (AWWA C111-72), or latest revision thereto.
Valves shall meet requirements of AWWA C500,
or latest revision, and shall be iron body resilient wedge design,
open right, for all valves four inches through 12 inches. All gates
larger than 12 inches shall be double disk with bronze disc rings
and bronze body seat rings. Stem shall be nonrising type, with two
"O" ring seals, two-inch operating nut, open right. Six-inch through
twelve-inch valves shall be designed for 200 psi working pressure,
400 psi hydrostatic test, and fourteen-inch and sixteen-inch valves
for 150 psi working pressure, 400 psi hydrostatic test. Joint type
shall be mechanical and shall include all accessories.
Valve boxes shall be cast iron, 5 1/4 inch
diameter, two-piece, sliding type, with lids marked "Water" providing
a minimum overlap of six inches.
Service pipe from main to meter shall be Type
K copper tubing of 3/4 inch minimum size. Sizes larger than two
inches shall be cast iron or other materials approved by the Department.
Each service shall have a corporation cock at the main, Mueller Std.
with C.C. thread and Compression Connection, a curb cock in the sidewalk,
Mueller Blue top enclosed in a five-foot "Buffalo" box, and a shutoff
valve on the street side of the meter.
Bends, tees, hydrants and other fittings shall
be provided with reaction or thrust blocking by placing concrete between
solid ground and the fittings to be anchored. Concrete shall be 1:2 1/2:5
mix, Class B, placed as directed.
Ductile-iron retainer glands shall be required
on all six-inch valves, hydrants, and main bends, as shown on contract
drawings or as directed by the engineer. Glands shall be cast of high-strength
ductile iron, fitting with cup point, square head, double-heat-treated
steel set screws, and tightened to 75 foot-pounds torque.
Trenches for waterworks utilities shall be backfilled
with the best of excavated material. Selected material shall be used
to bed the pipe, and no rock shall be permitted nearer than two feet.
Backfill shall be hand tamped under and around the pipe and to a depth
of 18 inches over the top of the pipe. Machine backfilling for the
remainder of the depth shall be fully tamped to prevent subsequent
settlement, and where applicable the provisions of the Regulations
for Street Excavation approved by the Board of Selectmen shall apply.
All required connections to existing water mains will be made by the Department unless authorized otherwise. For water mains to be installed in private property or private developments, the owner shall do all excavation at the existing main and furnish the fittings required at the main. The Department will install the fitting in accordance with §
268-14G. The owner shall then install the main, beginning at the outlet bell of the fitting, completely at his expense. For all service connections at existing mains, the Department will make the connections as part of the service (as detailed in Article
III), but the owner shall do all excavation at the existing main.
All new water mains shall be tested for leakage
as a measure of the quality of the workmanship and materials. The
main or system of mains shall be isolated by gating, filled with water
and all air exhausted. A metered connection shall be provided and
water introduced to the main or mains under a pressure of 50 pounds
per square inch greater than the normal operating pressure in the
test area. Leakage outward from the main in excess of 2.5 gallons
in 15 minutes per 1,000 feet of eight-inch pipe will be considered
as a condition which must be corrected before work will be accepted
by the Board as part of the Town system.
Layout and construction of water mains and appurtenances installed by private owners or developers will be subject to approval by the Department or its representative as detailed in Article
I and §
268-14 of Article
II. The engineer as authorized by the Board may also approve the plans and installation of waterworks utilities in public ways and private easements. In all cases the decisions, interpretations of the specifications, inspection and testing by the engineer, from time to time as the work progresses, shall be final, and final acceptance of the work by the Board will be based on a favorable recommendation by the engineer.
New and replacement water supply systems must
be designed to minimize or eliminate infiltration of floodwater into
the system.