6) Informational Note: No response necessary.
The riser enters into the center of the building which will be required to comply with NFPA 24, section 10.4.3 as indicted below. This is not part of the scope of this review, but is included so everyone is aware.
NFPA 24: 2016 ed.
10.4.3 Private Fire Service Mains Under Buildings.
Except as allowed by 10.4.3, private fire service mains shall not be allowed to run under buildings.
10.4.3.1 *
Private fire service mains supplying fire protection systems within the building shall be permitted to extend no more than 10 ft (3.0 m), as measured from the outside of the building, under the building to the riser location.
10.4.3.1.1 *
Pipe joints shall not be located directly under foundation fittings.
10.4.3.1.2 *
Piping shall be installed a minimum of 12 in. (300 mm) below the bottom of building foundations or footers.
10.4.3.1.2.1
The requirements of 10.4.3.1.2 shall not apply when the piping is sleeved with an approved material.
10.4.3.2 *
Where approved, private fire service mains supplying systems within the building shall be permitted to extend more than 10 ft (3.0 m) under the building when all the requirements of 10.4.3.2.1, through 10.4.3.2.4 are met.
10.4.3.2.1
Where the piping is installed under the building, all foundations or footers over the private fire service main shall be arched to create a minimum of 24 in (600 mm) clearance.
10.4.3.2.2
It shall be acceptable to install the piping in covered trenches where the trenches are accessible from within the building.
10.4.3.2.3
All joints shall be mechanically restrained.
10.4.3.2.4
A valve shall be installed before the piping enters under the building and within 24 in. (600 mm) of where the piping enters the building.