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§ 5F-2-1 H AWAI‘I C OUNTY C ODE (14) A new subsection 911.3 is added to the Uniform Plumbing Code to read as follows: “911.3 Single Stack System. When approved by the administrative authority, a single-stack system based on engineered studies and tests may be used in lieu of other related provisions in this code. Plans and specifications of such systems shall be prepared and stamped by a Hawaii licensed mechanical engineer.” (15) Subsection 1101.11.1 of the Uniform Plumbing Code is amended to read as follows: “1101.11.1 Primary Roof Drainage. Roof areas of a building shall be drained by roof drains or gutters. The location and sizing of drains and gutters shall be coordinated with the structural design and pitch of the roof. Unless otherwise required by the authority having jurisdiction, roof drains, gutters, vertical conductors or leaders, and horizontal storm drains for primary drainage shall be sized based on a storm of 60 minutes duration and 100 year return period. Refer to the National Weather Service rainfall map for 100 year, 60 minute storms at various locations.” (16) Subsection 1211.5 of the Uniform Plumbing Code is amended by adding a third sentence to read as follows: “Ground-joint unions may only be used at exposed fixture, appliance, or equipment connections and in exposed exterior locations immediately on the discharge side of a building shutoff valve. Heavy duty flanged type unions may be used in special cases, when first approved by the administrative authority. Bushings shall not be used in concealed locations.” (17) A new subsection 1212.2 is added to the Uniform Plumbing Code to read as follows: “1212.2 Anchored or strapped. Liquified Petroleum Gas Cylinder Tank Facilities more than 24 inches in vertical height, shall be secured against seismic movements within upper top-third (1/3) of its vertical dimensions.” SUPP. 11 (1-2022) 5F-8