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HomeMy WebLinkAboutC_LUA17-000175_Boeing Lift Station, Gate Entrance, and Fuel Spill Project_PlanReviewComments_20170614 DEPARTMENT OF COMMUNITY AND ECONOMIC DEVELOPMENT M E M O R A N D U M DATE: June 14, 2017 TO: Alex Morganroth, Planner FROM: Ann Fowler, Civil Plan Reviewer SUBJECT: Utility and Transportation Comments for Boeing Lift Station, Gate Entrance, and Fuel Spill Project 737 Logan Ave N LUA 17-000175 I have reviewed the application for the Boeing Lift Station, Gate Entrance, and Fuel Spill Project at 737 Logan Ave N (APN(‘s) 0723059001) and have the following comments: EXISTING CONDITIONS The proposed redevelopment project consists of three separate projects, each of which replace a portion of existing impervious areas.  Project 1 is situated within a fully paved parking and drive area and the proposed replaced impervious surface is a small section within that area. Directly adjacent to the proposed replaced impervious area is the storm drain collection system for the area.  Project 2 is situated within a fully paved active apron. Activities on the apron include the use of environmentally hazardous chemicals and the transportation and loading of fuel onto aircraft.  Project 3 is situated within a fully paved parking area and is situated between an existing building and the adjacent property line. Water The site is located outside of an Aquifer Protection Area. Sewer Wastewater service is provided by the City of Renton.. The proposed project 3 includes replacement of an existing private sewer lift station owned and maintained by the applicant. Storm Runoff from the site is carefully collected monitored and processed through oil water separators before leaving the site through a larger interceptor system and ultimately discharged through a submerged pipe into Lake Washington . Boeing Lift Station, Gate Entrance, and Fuel Spill Project – LUA17-000175 Page 2 of 3 CODE REQUIREMENTS SEWER 1. The applicant shall provide verification from the design engineer that the replacement of the sewer lift station is designed in accordance with the current version of the Department of Ecology Orange Book. SURFACE WATER 1. A geotechnical report, dated March 18, 2017, completed by Soil & Environmental Engineers, Inc. (S&EE) for the site has been provided. The submitted report describes the site is a Low Erosion Hazard area. Erosion control measures will need to be in place prior to starting grading activities on the site. The report needs to discuss the soil and groundwater characteristics of the site including infiltration potential and provide recommendations for project design and construction. The report discounts the use of infiltration for the site based on the presence of fill materials in the upper 10-11 feet of soil. Geotechnical recommendations presented need to be address within the project plans. 2. A Preliminary Drainage Plan and Technical Information Report (TIR), dated May 2017, was submitted by DOWL with the Land Use Application. Based on the City of Renton’s flow control map, the site falls within the Peak Rate Flow Control Standard area matching Existing Site Conditions and is within the Lake Washington and Cedar River Drainage Basin. The development is subject to Full Drainage Review in accordance with the 2017 City of Renton Surface Water Design Manual (RSWDM). All nine core requirements and the six special requirements are discussed in the Technical Information Report. 3. Direct Discharge Exception - The project site is located within the Lake Washington and Cedar River drainage basins and the flowpath from the project site discharge point is less than a half mile to the 100-year floodplain of Lake Washington and qualifies for the direct discharge exemption in accordance with Section 1.2.3.1 of the RSWDM and must adhere to all requirements thereof. 4. The project discharges to two separate threshold discharge areas which converge more than ¼- mile downstream of the respective project sites. The combined surface area of new and/or replaced pollution generating impervious surface (PGIS) for each separate threshold discharge area of the redevelopment project is less than 5,000 square feet. Therefore, the development is exempt from the requirement to provide water quality treatment prior to discharge for each separate threshold discharge area. 5. Appropriate on-site BMPs will be required to help mitigate the new runoff created by this development. The final drainage plan and drainage report, addressing the implementation of on- site BMPs must be submitted with the civil construction permit application. The applicant will need to re-evaluate the feasibility of utilizing basic dispersion for the target impervious surface areas that may be able to disperse into any added or existing landscaping areas. 6. A Construction Stormwater General Permit from Department of Ecology will be required if grading and clearing of the site exceeds one acre. A Stormwater Pollution Prevention Plan (SWPPP) is required for this site. 7. Surface water system development fee is $0.641 per square foot of new impervious surface, but not less than $1,608.00. This is payable prior to issuance of the construction permit. Boeing Lift Station, Gate Entrance, and Fuel Spill Project – LUA17-000175 Page 3 of 3 TRANSPORTATION 1. Parking lot reconstruction shall be in accordance with City code 4-4-80G. GENERAL COMMENTS 1. All existing and proposed utility lines (i.e. electrical, phone, and cable services, etc.) along property frontage or within the site must be underground. The construction of these franchise utilities must be inspected and approved by a City of Renton inspector. 2. Maximum exposed retaining wall height is 6-ft and shall be setback a minimum of 3-ft from the right-of-way as outlined in RMC 4-4-040 – Fences, Hedges and Retaining Walls. 3. Adequate separation between utilities as well as other features shall be provided in accordance with code requirements. a. 7-ft minimum horizontal and 1-ft vertical separation between storm and other utilities is required with the exception of water lines which require 10-ft horizontal and 1.5-ft vertical. b. The stormwater line should be minimum 5 feet away from any other structure or wall or building. c. Trench of any utility should not be in the zone of influence of the retaining wall or of the building. 4. All civil construction permits for utility and street improvements will require separate plan submittals. All utility plans shall confirm to the Renton Drafting Standards. A licensed Civil Engineer shall prepare the civil plans. Please visit the Development Engineering Forms page for the most up-to-date plan submittal requirements: http://rentonwa.gov/business/default.aspx?id=42473 5. A landscaping plan shall be included with the civil plan submittal, if applicable. Each plan shall be on separate sheets. 6. Fees quoted in this document reflect the fees applicable in the year 2017 only and will be assessed based on the fee that is current at the time of the permit application or issuance, as applicable to the permit type. Please visit www.rentonwa.gov for the current development fee schedule.