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HomeMy WebLinkAboutDOE8_Advisory_NotesDEPARTMENT OF COMMUNITY AND ECONOMIC DEVELOPMENT Page 1 of 2 LUA25-000025 ADVISORY NOTES TO APPLICANT The following notes are supplemental information provided in conjunction with the administrative land use action. Because these notes are provided as information only, they are not subject to the appeal process for the land use action. Planning: (Contact: Jill Ding, 425-430-6598, jding@rentonwa.gov) 1. RMC section 4-4-030.C.2 limits haul hours between 8:30 am to 3:30 pm, Monday through Friday unless otherwise approved by the Development Services Division. 2. Commercial, multi-family, new single family and other nonresidential construction activities shall be restricted to the hours between seven o’clock (7:00) a.m. and eight o’clock (8:00) p.m., Monday through Friday. Work on Saturdays shall be restricted to the hours between nine o’clock (9:00) a.m. and eight o’clock (8:00) p.m. No work shall be permitted on Sundays. 3. Within thirty (30) days of completion of grading work, the applicant shall hydroseed or plant an appropriate ground cover over any portion of the site that is graded or cleared of vegetation and where no further construction work will occur within ninety (90) days. Alternative measures such as mulch, sodding, or plastic covering as specified in the current King County Surface Water Management Design Manual as adopted by the City of Renton may be proposed between the dates of November 1st and March 31st of each year. The Development Services Division’s approval of this work is required prior to final inspection and approval of the permit. 4. The applicant may not fill, excavate, stack or store any equipment, dispose of any materials, supplies or fluids, operate any equipment, install impervious surfaces, or compact the earth in any way within the area defined by the drip line of any tree to be retained. 5. The applicant shall erect and maintain six foot (6') high chain link temporary construction fencing around the drip lines of all retained trees, or along the perimeter of a stand of retained trees. Placards shall be placed on fencing every fifty feet (50') indicating the words, “NO TRESPASSING – Protected Trees” or on each side of the fencing if less than fifty feet (50'). Site access to individually protected trees or groups of trees shall be fenced and signed. Individual trees shall be fenced on four (4) sides. In addition, the applicant shall provide supervision whenever equipment or trucks are moving near trees. Development Engineering: (Contact: Scott Warlick, 425-430-7216, swarlick@rentonwa.gov) 1. See Development Engineering Memo dated February 3, 2025. Fire Authority: (Contact: Corey Thomas, 425-276-9582, cthomas@rentonrfa.org) 1. The fire impact fees are currently $579.41 per unit, paid at the time of building permit issuance. 2. The fire flow requirement for a single-family home and ADU’s is 1,000 gpm minimum for dwellings up to 3,600 square feet (including garage and basements). If the dwelling exceeds 3,600 square feet, a minimum of 1,500 gpm fire flow would be required. A minimum of one fire hydrant is required within 300 feet of the proposed buildings and two hydrants if the fire flow goes up to 1,500 gpm. 3. Currently this area of the City of Renton has no public water system, and the private water system is not capable of supporting any approved fire hydrants. The only option for this area of the city is EXHIBIT 9 Docusign Envelope ID: 22A8539B-6B4F-45E9-B44D-17C2E5317108 ADVISORY NOTES TO APPLICANT Page 2 of 2 LUA25-000025 to allow approved residential fire sprinkler systems to be installed. This will require an on-site water tank within the proposed dwelling with an electric pump attached to the fire sprinkler system. 4. Fire department apparatus access roadways from the public street system are adequate as they exist. Technical Services: (Contact: Stephanie Rary, 425-430-6592, srary@rentonwa.gov) 1. None Community Services: (Contact: Betsy Severtsen, 425-430-6611, bsevertsen@rentonwa.gov) 1. None Police: (Contact: Sandra Havlik, 425-430-7520, shavlik@rentonwa.gov) 1. None Building: (Contact: Rob Shuey, 425-430-7235, rshuey@rentonwa.gov) 1. None Docusign Envelope ID: 22A8539B-6B4F-45E9-B44D-17C2E5317108 Page 1 of 4 LUA24-000300 DEPARTMENT OF COMMUNITY AND ECONOMIC DEVELOPMENT M E M O R A N D U M DATE: February 3, 2025 TO: Jill Ding, Senior Planner FROM: Scott Warlick, Development Engineer SUBJECT: Williams ADU/Garage 13411 SE 151st St LUA25-000025 I have reviewed the application for the Williams ADU/garage project located at 13411 SE 151st At, parcel No: 2223059112, and have the following comments: EXISTING CONDITIONS: WATER: The water service is provided by the Maplewood Addition water coop. SEWER: The current home is on septic. STORM DRAINAGE: There is no stormwater main along the frontage of the property on SE 151st St. There are critical areas onsite including Regulated Slopes, Erosion Hazard – High, Special Flood Hazard Area, and Regulated Shoreline. The site is located in Zone 2 of the City’s Aquifer Protection Area (APA). STREETS: The proposed project fronts SE 151st St to the north property line and is classified as a Residential Access Road with an existing ROW width of 60-feet. WATER COMMENTS: 1. Approval from the Maplewood Addition water co-op for the construction of a new ADU was provided as part of the land use submittal. SEWER COMMENTS: 1. Provide an approval from King County Public Health for the proposed ADU at the time of building permit submittal. STORM DRAINAGE COMMENTS: 1. Donna Breske & Associates, with the Land use application, submitted a Preliminary Drainage Plan and Technical Information Report (TIR) dated December 19, 2024. Based on Docusign Envelope ID: 22A8539B-6B4F-45E9-B44D-17C2E5317108 ADVISORY NOTES TO APPLICANT Page 2 of 4 LUA24-000300 the City of Renton’s flow control map, the site falls within the Flow Control Duration (Matching Forested) standard and is within the Lower Cedar River drainage basin. The report is based on a simplified and targeted drainage review. a. General: Critical areas on site that may affect stormwater review include: Regulated Slopes, Erosion Hazard – High, Special Flood Hazard Area, and Regulated Shoreline. i. A supplemental Geotechnical Report was prepared by Pacific Geo Engineering, dated June 28, 2024, was submitted by the Applicant with the Land Use Application that address the critical areas on-site. b. Offsite Analysis, RSWDM Core Requirement #2: All proposed projects must submit an offsite analysis report that assesses potential offsite drainage and water quality impacts associated with development of the project site and the initial permit submittal shall include, at minimum, a Level 1 Downstream Analysis. A level 1 downstream analysis has been included. c. Flow Control, RSWDM Core Requirement #3: Any proposed detention and/or water quality vault shall be designed in accordance with the RSWDM that is current at the time of civil construction permit application. The project is claiming an exemption due to less than 5,000 square feet of new impervious surface. i. Staff concurs with the exemption. d. Conveyance, RSWDM Core Requirement #4: All new conveyance systems constructed as part of the project must be sized to meet RSWDM standards for the total tributary area (onsite and offsite) that the storm systems serve. No new conveyance system is proposed. e. Construction Stormwater Pollution Prevention, Core Requirement #5: The proposal does not include a CSWPP and ESC plan. i. An erosion control plan will be required as part of the building permit submittal. f. Maintenance and Operations, Core Requirement #6: The preliminary TIR includes a maintenance and operation manual. g. Financial Guarantees and Liability, RSWDM Core Requirement #7: All drainage facilities constructed or modified for projects must comply with the financial guarantee requirements and the liability requirements of the City. i. Based on the proposal a performance bond would not be required. h. Water Quality, RSWDM Core Requirement #8: All projects that add more than 5,000 square feet of pollution generating impervious surface (PGIS) that is not fully dispersed and less than 0.75 acre of pollution generating pervious surface that is not fully dispersed require water quality. i. This project does not require water quality treatment. However the project is proposing the use of a Contech stormfilter to treat the PGIS before routing runoff to a proposed drywell for infiltration. The proposed configuration is conceptually acceptable. ii. Full infiltration may be applied to any non-pollution generating impervious surface (NPGIS) and to those pollution generating impervious surfaces (PGIS) where either the soil beneath the infiltration BMP has properties that reduce the risk of groundwater contamination per Section 5.2.1 of the RSWDM or where a water quality facility provides treatment prior to infiltration. However, if water quality treatment (Core Requirement #8) would not otherwise be required and Docusign Envelope ID: 22A8539B-6B4F-45E9-B44D-17C2E5317108 ADVISORY NOTES TO APPLICANT Page 3 of 4 LUA24-000300 the soil properties are not met, the applicant can consider full infiltration of PGIS infeasible. i. Appropriate on-site BMPs satisfying Core Requirement #9 will be required to help mitigate the new runoff created by this development to the maximum extend feasible. On-site BMPs shall be evaluated as described in Section C.1.3 of the 2022 RSWDM. A preliminary drainage plan, including the application of on-site BMPs, shall be included with the land use application, as appliable to the project. The final drainage plan and drainage report must be submitted with the building permit. i. Full infiltration is proposed via drywell. Applicant will need to provide septic system approval from king county with recommend setbacks for the drywell system. A site plan showing the septic system and drywell location with setback dimensions will be required at building permit submittal. ii. Infiltration devices must be located downgradient of the primary and reserve drain areas. j. Special Requirement #6: Aquifer Protection Areas is required for projects in Targeted Drainage Review Project Category #1. i. The site is located in Zone 2 of the City’s Aquifer Protection Area (APA). In this zone, stormwater open conveyance systems, such as ditches and channels, and water quality facilities may require a liner per sections 6.2.4 and 1.2.4.3 of the 2022 RSWDM. Special Requirement #6 will need to be evaluated as part of the drainage review. 2. A geotechnical report for the site is required and shall be submitted with the land use application. Information concerning the soils, geology, drainage patterns, vegetation present, water table and soil permeability, with recommendations of appropriate on-site BMP options with typical designs for the site from the geotechnical engineer, shall be submitted with the application. The geotechnical report should include an on-site infiltration test to clearly show if the site is suitable or unsuitable for infiltration. a. A geotechnical report prepared by Pacific Geo Engineering, dated June 28, 2024, was submitted by the Applicant with the Land Use Application. b. The geotechnical report indicates the subsurface soils are primarily of medium sand with gravel. A long-term design infiltration rate of 3.6-inch/hour was recommended for the design of infiltration facilities. No groundwater mounding was observed at the test pit locations up to eight feet below existing grade. 3. The 2025 Surface water system development fee (SDC) is $2,350.00 per new single-family residence and ADU. This is payable prior to issuance of the construction permit and are not vested to the rates at land-use approval. This fee is subject to change based on the calendar year the construction permit is issued. TRANSPORTATION/STREET COMMENTS: 1. Per City code 4-6-060 frontage improvements are required for new construction or addition in excess of $175,000. The proposed project fronts SE 151st St to the north with existing right of way (ROW) width of approximately 60 feet with an existing paved width of approximately 22 feet. To meet the City’s complete street standards for a residential access street, per RMC 4-6-060, a minimum ROW width of 53 feet is required. Per RMC 4-6-060 half of street improvements as taken from the road centerline shall be required and include a 26-foot Docusign Envelope ID: 22A8539B-6B4F-45E9-B44D-17C2E5317108 ADVISORY NOTES TO APPLICANT Page 4 of 4 LUA24-000300 paved road (13 feet each side), a 0.5-foot curb, an 8-foot planting strip, and a 5-foot sidewalk. a. A formal fee-in-lieu request was submitted for the street frontage improvements along SE 151st St. Provide the fee-in-lieu request at building permit submittal. 2. Refer to City code 4-4-080 regarding driveway regulations. a. Only one driveway is allowed per 165-feet of frontage. Either the existing driveway or the new driveway will need to be removed from the plans as part of the building permit submittal. b. The maximum width of a driveway at the property line is 9-feet for a single loaded garage and 16-feet for a double loaded garage. 3. Undergrounding of all existing and proposed utilities is required on all frontages per RMC 4- 6-090. 4. Paving and trench restoration shall comply with the City’s Trench Restoration and Overlay Requirements. 5. The development is subject to transportation impact fees. Fees will be charged based on the rate at the time of construction permit issuance and are not vested to the rates at land- use approval. a. For an ADU, the transportation fee is $6,184.59 based on the City’s 2025 fee schedule. Final transportation impact fees will be paid based on the current impact fee rate at the time of building permit issuance. GENERAL COMMENTS: 1. The fees listed are for 2025. The fees that are current at the time of the respective permit issuance will be levied. Please see the City of Renton website for the current fee schedule. Docusign Envelope ID: 22A8539B-6B4F-45E9-B44D-17C2E5317108