HomeMy WebLinkAboutpre-appl-12-014-ACE AviationPLANNING/BUILDING/
PUBLIC WORKS DEPARTMENT
M E M O R A N D U M
DATE:
February 20, 2012
TO:
Arneta Henninger, Development Services Project Manager
FROM:
Abdoul Gafour, Water Utility Engineering Supervisor
SUBJECT:
Pre-application No. 12-014 – Alterations and Addition to
ACE Aviation at 289 E. Perimeter Road within Renton Municipal Airport
The preliminary fire flow demand for the proposed project as determined by Renton Fire Marshal is 3,750 gallons per minute (gpm) based on a fully fire sprinklered building.
The maximum available capacity from the existing City’s water system in vicinity of the development site is 2,500 gpm from the existing 8-inch and 12-inch water mains in E. Perimeter
Road and from the existing 8-inch water main along the northwesterly side of the existing building. The static water pressure is approximately 68 psi at finished grade elevation 30
feet.
As such the existing system cannot deliver the preliminary required fireflow for the redevelopment project.
In order to increase the flow capacity of the above existing 12-inch water line in E. Perimeter Rd. to deliver the required fireflow, a section of approximately 120 feet of the existing
8-inch water main in the roadway must be replaced with a larger 12-inch pipe and be connected to the existing 12-inch water line in Logan Ave N.
Additional fire hydrants may required, one hydrant for every 1,000 gpm of fire flow demand. The number and final location of the hydrants shall be determined based on the final site
plan and access.
There is an existing 8-inch backflow prevention assembly (DDCVA) for the existing fire sprinkler system. The applicant shall verify with a fire sprinkler designer to confirm if the
existing assembly can remain at its current place or if a new and/or larger assembly is required at a different location.
There is an existing 3/4-inch domestic water meter to the existing building. The applicant shall verify the size for the required domestic meter for the new building based on the Uniform
Plumbing Code meter sizing criteria.
A reduced backflow prevention assembly (RPBA) will be required for the domestic water meter. The RPBA shall be installed inside a “hot-box” per City standard details.
A separate water meter and backflow prevention assembly (DCVA) is required for the landscape irrigation system.
The development is subject to the City’s water system development charges per Renton Municipal Code (RMC4-1-180C), if additional or larger size meters are needed.
The development is subject to applicable City’s plan review and inspection fees.
Civil plans for the water main improvements shall be prepared by a professional engineer registered in the State of Washington and shall meet the City’s standards.
CC: Vanessa Dolbee