Page 140 - Trenchless Technology Piping Installation and Inspection

106 Cha pte r T h ree

Backfill materials must be in good quality and free from cinders, frozen
material, ashes, refuse, boulders, rocks, or organic materials. Park-
ways and other nonpaved areas may not need compaction, depending
on the potholing size, conditions and project requirements. If needed,
pit flooding may be used to obtain the necessary compaction
requirements.
After pit backfilling, additional pieces of pipes, extra fittings,
tools, and incidental materials, such as debris and excess spoil mate-
rials, must be removed from the jobsite or right-of-way (ROW). All
undamaged walkways and pavements must be cleaned. All grass
areas must be reseeded and/or replaced with sod, shrubs, trees, and
other plants as per their original conditions or better. Damaged and
removed pavement must be repaired/replaced according to the
municipality, local government, or Department of Transportation
(DOT) specifications and standards.

3.15 Waste Disposal
The contractor must be familiar with all the regulations for han-
dling and disposing of the lining materials and chemicals, such as
the following:
• Unused lining materials and other contaminated materials
must be returned to shop/warehouse or be disposed of in accor-
dance with applicable safety and waste disposal regulations.
• Uncured materials must be disposed in a facility permitted to
accept chemical waste.
• Cured (or polymerized) waste must be taken to appropriate
sanitary landfills. The contractor is responsible for assuring
that all permits and other types of disposal documentation
are completed and distributed as required by regulatory
agencies.
• Since regulations vary, based on the coating and lining mate-
rial, applicable federal, state, and local regulations before dis-
posal must be followed.

3.16 Descriptions of Coatings and Linings Methods
The following sections provide specific information on each of the
four basic coating and lining methods.

3.16.1 Cement-Mortar Linings
Cement-mortar spray-in liner has been in existence since the 1900s and
is one of the most common lining methods used today. The first suc-
cessful trial of spray applied cement lining took place in early 1930s