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review\WTR-17-2011-Water Availability\pre-appl-11-014-Heritage-Hills-Apts.doc\AG
PLANNING/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.
1. 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.
2. 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.
3. 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.
4. 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.
5. 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.
6. A separate water meter and backflow prevention assembly (DCVA) is required for the
landscape irrigation system.
7. 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.
8. The development is subject to applicable City’s plan review and inspection fees.
H:\File Sys\WTR - Drinking Water Utility\WTR-17 - Water Availability-Pre-Application-Building Permits
review\WTR-17-2012-Water Availability and Pre-Application Reviews\Pre-Application 2012\pre-appl-12-
014-ACE Aviation.doc\AG
9. 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