B. Failure will be deemed to have occurred if the grout fails to prevent groundwater
infiltration or prevent the internal deterioration or corrosion of the manhole. If any such
failure occurs within the warranty period, the damage shall be repaired by the Contractor
in a manner satisfactory to the Engineer at no cost to the Owner within 60 days after
written notification of the failure. The repaired grout application shall have an additional
2 years duration warranty period starting on the date of repair.
PART 2 - PRODUCTS
2.01 GENERAL:
A. The materials to be utilized in the rehabilitation of manholes shall be designed and
manufactured to withstand the corrosive effects of hydrogen sulfide in a wastewater
environment, prevent infiltration, and withstand constant and direct contact with flowing
wastewater.
2.02 INTERNAL-LINER SYSTEM (CEMENT):
A. The internal liner system shall be specifically designed for a minimum service life of 50
years, to continuously bond to the substrate, to withstand a temperature range of 0
degrees to 100 degrees Fahrenheit, to restore the interior of the manhole, to withstand the
corrosive gases of domestic wastewater (especially hydrogen sulfide), to eliminate the
infiltration of groundwater through the manhole walls and mortar joints, and to be
structurally capable of withstanding the pressure of groundwater based on the depth of the
specific manhole being lined.
B. The internal liner system shall consist of a hydrostatic leak correction, hydraulic cement
patching of voids and a cementitious final coating. Infiltration control, patching material,
and/or a cementitious coating coat may all be necessary depending on the extent of the
manhole corrosion, damage, substrate profile, loss of material, and infiltration. All
materials used shall be completely compatible with all other manhole rehabilitation
products being used. Contractor shall ensure compatibility of all products with the
individual material manufacturers.
C. Where necessary, infiltration control and patching materials shall be installed in
accordance with the lining manufacturer’s requirements prior to installing the lining
system to control active infiltration and repair voids in the existing manhole walls or
damaged inverts. Infiltration control and patching materials shall be rapid-setting, high
early strength, hand-applied cementitious materials for stopping infiltrating water and
making repairs to concrete, brick, or other masonry-constructed manholes. The materials
shall be non-shrinking, nonmetallic, and non-corrosive. The materials shall be
2019 CIPP Lining Project Manhole Rehabilitation
Nashua, NH 02800-4
