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HomeMy WebLinkAboutPlan Review Comments PRE 12-014 ` DEPARTMENT OF COMMUNITY AND ECONOMIC DEVELOPMENT M E M O R A N D U M   DATE: February 22, 2012     TO: Vanessa Dolbee, Planner     FROM: Arneta Henninger, Plan Review     SUBJECT: ACE AVIATION ADDITIONS & ALTERATIONS 289 E. PERIMETER ROAD PRE 12-014      NOTE: The applicant is cautioned that information contained in this summary is preliminary and non-binding and may be subject to modification and/or concurrence by official city decision-makers. Review comments may also need to be revised based on site planning and other design changes required by City staff or made by the applicant. I have completed a preliminary review for the Ace Aviation proposal to expand their existing multi-purpose aircraft hanger & corporate center multi-story building, located in Sect. 7 Twp. 23N, Rng 5 E. The following comments are based on the pre-application submittal made to the City of Renton by the applicant. Water This site is located in the City of Renton water service area. The site is not located in the Aquifer Protection Zone. There is an existing 8-inch DI water main and a 12-inch DI water main located in the vicinity. See City of Renton drawing number W 0455 and W 0804 and W 2087. The site is located in the 196 water pressure zone. Per the City of Renton Fire Marshal, the preliminary fire flow requirement is 3,750 gpm based on a fully fire sprinklered building including all existing areas that are retained. The maximum available capacity from the existing city 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. The existing system cannot deliver the preliminary required fire flow for the redevelopment project. The City of Renton Water Utility has provided the following information on what is required to serve the proposed project: In order to increase the flow capacity of the above existing 12-inch water line in E. Perimeter Rd. to deliver the required fire flow, 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. Existing fire hydrants need to be brought up to current code if not existing. 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. The water System Development Charges are based on the size of any and all water meters if a new meter is required or an existing meter is upsized. These fees are collected at the time a construction permit is issued then prior to the issuance of the building permit. Credit will be given for the existing meter. Sanitary Sewer • There is an existing 24” sanitary sewer main in the vicinity of this project proposal site. • The project will need to show the location of the existing sidesewer connection from the buildings to the main. • The project needs to show the location of the oil separator. If one does not exist, the project will be required to install a new oil water separator. • Wastewater system development charges are based on the size of the domestic water meters. Storm Drainage There are existing storm drainage conveyance pipes and facilities on site. A storm drainage report will be required. All storm drainage shall be in compliance with the City of Renton amendments to the 2009 King County Surface Water Drainage Manual. The project will need to show how the new addition and new paving will handle the storm runoff. Stormwater System developments are 0.405 per square foot of new impervious surface area but not less than $1,012. Street Improvements Additional street improvements will not be required. Traffic Mitigation fees may apply. General Comments All required utility, drainage, and street improvements will require separate plan submittals prepared according to City of Renton drafting standards by a licensed Civil Engineer. All plans shall be tied to a minimum of two of the City of Renton Horizontal and Vertical Control Network. Permit application must include an itemized cost estimate for these improvements. Half of the fee must be paid upon application for building and construction permits, and the remainder when the permits are issued. There may be additional fees for water service related expenses. See Drafting Standards.