[Amended 3-19-1997 by L.L. No. 5-1997]
A. When a sewer main, water main or service is installed
and completed, but prior to refilling the trench, the contractor performing
the work shall notify the Code Enforcement Officer so that the installation
can be inspected and approval can be given to refill the trench. Trenches
refilled prior to inspection will have to be reopened by the contractor at
his expense. The contractor may also be subject to a penalty. These refilling
regulations also apply to property owners installing their own building water
and/or sewer connection.
B. In the discharge of their duties and for the purpose
of sewer inspection, properly identified representatives of the Code Enforcement
Officer are legally authorized to enter any premises or property in the Town
of Milton.
Three batter boards, a top line plumb bob and grade pile shall be used
to transfer line and grade from grade stakes to pipeline unless some other
method of checking the pipe invert grade and line is approved by the Town.
The class of bedding to be used shall be as specified in the final submission
drawings. There shall be excavation for bells and flanges in all classes of
bedding. Beddings for pipe shall conform to one or more of the following:
A. First-class bedding. First-class bedding is that method
of laying pipe in which the pipe is carefully bedded in compacted granular
materials placed on a flat trench bottom. The granular material shall be crushed
stone, pea gravel or sand, and maximum particle size shall be 3/4 inch. The
depth of the granular bedding below the bottom of the pipe shall be 1/4 the
outside pipe diameter or four inches, whichever is greater, and shall extend
to a point four inches over the top of the pipe. If mechanically tamped, material
may be placed in six-inch layers; three-inch layers if tamped by hand. If
a clean, dry, free-flowing sand is used, no compaction will be required. All
materials up to 12 inches over the top of the pipe shall be placed by hand.
B. Concrete cradle bedding.
(1) Concrete cradle bedding is that method of bedding pipe
in which the lower part of the pipe exterior is bedded in plain or reinforced
concrete of 2,500 psi or greater, having a minimum thickness under the pipe
of 1/4 the nominal inside diameter and extending up the sides of the pipe
for a height equal to 1/4 of the outside diameter.
(2) The cradle shall have a width at least equal to the outside
diameter of the barrel of the pipe plus eight inches, and it shall be constructed
monolithically without horizontal construction joints. The remainder of the
bedding to a point four inches over the top of the pipe shall conform to first-class
bedding.
C. Concrete encasement. Concrete encasement is that method
of bedding pipe in which the entire pipe is jacketed by plain or reinforced
concrete having a compressive strength of 2,500 psi or greater. The encasement
width and height shall be at least equal to the outside diameter of the barrel
of the pipe plus eight inches or as shown on the approved final subdivision
drawings. Normally stronger pipe should be used, with concrete cradle or encasement
being permitted only in unusual cases.
Methods of excavation support and backfill in tunnels made beneath existing
structures, railroads, pavements and sidewalks for the installation of pipe
or conduits shall be subjected to approval of the Town of Milton before work
is begun.
Methods of jacking or boring to install pipe shall be approved by the
Town of Milton before such work is started.