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HomeMy WebLinkAbout16-0916 Carpenter Short Plat Utility I Comments DEPARTMENT OF COMMUNITY AND ECONOMIC DEVELOPMENT M E M O R A N D U M   DATE: September 16, 2016     TO: Chad Allen, Encompass Engineering and Surveying     FROM: Ian Fitz-James, Civil Plan Reviewer     SUBJECT: Utility Permit Review I Comments Carpenter Short Plat - 3600 Block Lincoln Avenue NE City of Renton Permit #U16-004636      I have reviewed the first utility permit plan submittal for Carpenter Short Plat located along the 3600 Block of Lincoln Avenue NE and my comments are listed below. Please feel free to contact me if you have any questions or would like to schedule a meeting to review project concerns. My phone number is 425-430-7288 and my email address is ifitz-james@rentonwa.gov. GENERAL COMMENTS There is a digital set of redlined plans and a digital redlined TIR. Include a letter with responses to all of the comments with your plan resubmittal. If the infiltration BMPs will be constructed as part of each single family building permit and not as part of the utility construction permit, a deferral request will be required prior to final short plat. COVER SHEET COMMENTS – SHEET 1 The project utility permit number is #U16-004636. *This is a typical comment for each sheet. Add labels as redlined to upper left and lower right hand corners. *This is a typical comment for each sheet. EXISTING CONDITIONS COMMENTS – SHEET 2 No comments on this sheet. ROADWAY / GRADING / DRAINAGE & WATER PLAN COMMENTS – SHEET 3 Add all pavement and concrete hatches to legend. Show 2” grind and overlay for entirety of Lincoln Avenue NE for the entire project frontage as redlined. Add note that contractor is to coordinate any driveway regarding with neighboring property owner for 3636 Lincoln Avenue NE. Show the proposed curb line and sidewalk that will be installed as part of Lincoln Short Plat work. Update grind and overlay limits accordingly. Provide a blow-up of the curb ramp at the southern project edge. This curb ramp shall be a perpendicular curb ramp per WSDOT Std. Plan F-40.15-03 Type B. Provide roadway stations for both driveways. Provide roadway stations for beginning and end of roadway stripe. Show the northern end of the roadway stripe. Provide roadway stations for the beginning and end of curb. Show the existing right of way line in the Lincoln Avenue NE street section. Label Lincoln Avenue NE street section as looking north. Per Short Plat condition 8, the private drive aisle / street shall be separated 5’ from the adjacent property line. Update the plan and street section as necessary to demonstrate compliance with this condition of approval. Show replacement of existing pavement for shared drive aisle to project extents. Pavement width shall be 16’ for project extents. Update the plan and roadway section accordingly. Show how flow control for drive aisle drainage is being implemented. The drainage design is proposing to limit the impervious surface of each lot to 2,600 square feet per lot. Provide a table on the plan indicating the maximum impervious surface for each lot. A drainage covenant will be required for restricted footprint at the time of final short plat. A minimum 5’ setback is required between any part of an infiltration facility and a property line per Section C.2.2.2 of the 2009 KCSWDM. The infiltration facility for Lot 3 is located in a slope steeper than 15%. Per Section C.2.2.2 of the 2009 KCSWDM, geotechnical approval is required for this infiltration facility. Infiltration facilities must be setback at least 15 feet from buildings with crawl space or basement elevations that are below the overflow point of the infiltration system per Section C.2.2.3 of the 2009 KCSWDM. Runoff from roadways, driveways, and parking areas shall pass through a yard drain or catch basin fitted with a down-turned elbow prior to entering the infiltration system per Section C.2.2.3 of the 2009 KCSWDM. What is the purpose of the new IE for CB 134207? This CB drains east from Lincoln Avenue. Match crowns where new storm drain meets existing catch basin. Update plan as redlined. Evaluate the effects of drainage runoff from the adjacent property (3601 Lincoln Avenue NE) on Lot 3. Show any proposed storm drainage features. As the drive aisle is shifting to 5’ from the adjacent property line, revise the water main alignment to be 3’ from the northern edge of the new drive aisle alignment. Move the new hydrant to the redlined location. The hydrant will require a water easement on Lot 2. In general, hydrants required as part of a redevelopment project should not be located along neighboring parcel frontages. Revise the note calling for relocation of the existing hydrant to say to replace the existing hydrant with new hydrant located in the planter strip. Connection to an existing water main using a tapping tee is per COR Std. Plan 300.1. Concrete thrust blocking is per COR Std. Plan 330.2. Label clearance between proposed water and sewer main on plans. Show and call out a new 1” water service and meter setter for the existing house at 3623 Lincoln Avenue NE as redlined. Add a note stating that the City will relocate the existing meter after completion of the new main. Contractor to reconnect the existing service line to the new meter. Show water easement for all three water meters. Add a note on plan calling for future home on Lot 3 to be equipped with a fire sprinkler system. Show mailbox location for new lots. Provide postmaster approval for the new mailbox location. Address all other plan redlines. SEWER PLAN AND PROFILE COMMENTS – SHEET 4 Show where the side sewer from Lot 3 will be located. Show how close it is to the infiltration BMP for Lot 2. It appears the line may be in conflict with the proposed BMP. Will the side sewer for Lot 3 be located in the drive aisle? If so, installation of the force main will be required ahead of paving. Add a note to the plan stating that sewer cleanouts behind sidewalk shall be located in 2’x2’ concrete pad adjacent to the back of walk. Label and dimension all sewer easements. TREE RETENTION PLAN COMMENTS – SHEET 5 Revise tree retention plan per landscape comment #1. NOTES AND DETAILS COMMENTS – SHEET 6 Show storm drain cleanout in infiltration BMP detail per redlines. KCRTS model shows an effective storage depth of 6’. Address other redlines. DETAILS COMMENTS– SHEET 7 Add WSDOT Std. Plan F-40.15-03 Perpendicular Curb Ramp to plan. DETAILS COMMENTS – SHEET 8 Is the neighborhood delivery and collection box proposed for this project? If so, please show the location on Sheet 3. DETAILS COMMENTS – SHEET 9 No comments on this sheet. DETAILS COMMENTS – SHEET 10 No comments on this sheet. TESC PLAN COMMENTS – SHEET 11 Show additional silt fence as redlined. Show which trees are being retained on this plan sheet. Adjust clearing limits to account for trees that are being removed. Two of the catch basins that are labeled to have inlet protection appear to have solid locking lids. Linework for some of the disturbance limits appears to be backwards. It can be hard to tell which area is in the clearing limits. Provide a legend for the silt fence and disturbance limits linework. Add Note 17 – All ESC measures must be removed after construction activity is complete. Update construction sequence as redlined. TESC DETAILS COMMENTS – SHEET 12 No comments on this sheet. LANDSCAPE PLANS COMMENTS – SHEETS 13-14 Use City of Renton title block for landscape plans. Per the preliminary short plat decision, the applicant was proposing to retain a total of 12 significant trees, which exceeded the tree retention requirement of 8 trees. The current proposal to retain 4 trees is significantly less than the original proposal to retain 12 trees. Please submit a revised tree retention plan showing the retention of 8 trees (as approved under the preliminary short plat decision) or submit an arborist report detailing why additional trees cannot be retained. Please add the following tree protection measures to the Tree Retention Plan: Protection Measures During Construction: Protection measures in this subsection apply for all trees that are to be retained. All of the following tree protection measures shall apply: Construction Storage Prohibited: The applicant may not fill, excavate, stack or store 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. Fenced Protection Area Required: Prior to development activities, the applicant shall erect and maintain six foot (6’) high chain link temporary construction fencing around the drip lines of all retained trees or at a distance surrounding the tree equal to one and one quarter feet (1.25’) for every one inch (1”) of trunk caliper, whichever is greater, or along the perimeter of a tree protection tract. 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. Protection from Grade Changes: If the grade level adjoining to a tree to be retained is to be raised, the applicant shall construct a dry rock wall or rock well around the tree. The diameter of this wall or well must be equal to the tree’s drip line. Impervious Surfaces Prohibited within the Drip Line: The applicant may not install impervious surface material within the area defined by the drip line of any tree to be retained. Restrictions on Grading within the Drip Lines of Retained Trees: The grade level around any tree to be retained may not be lowered within the greater of the following areas: (i) the area defined by the drip line of the tree, or (ii) an area around the tree equal to one and one half feet (1 1/2') in diameter for each one inch (1") of tree caliper. A larger tree protection zone based on tree size, species, soil, or other conditions may be required. (Ord. 5676, 12 3 2012) Mulch Layer Required: All areas within the required fencing shall be covered completely and evenly with a minimum of three inches (3") of bark mulch prior to installation of the protective fencing. Exceptions may be approved if the mulch will adversely affect protected ground cover plants. (Ord. 5676, 12 3 2012) Monitoring Required during Construction: The applicant shall retain a certified arborist or licensed landscape architect to ensure trees are protected from development activities and/or to prune branches and roots, fertilize, and water as appropriate for any trees and ground cover that are to be retained. TIR COMMENTS Add page numbers to the TIR. Revise site plan in TIR with updates. Provide a basin map showing the two separate threshold discharge areas. Provide a developed basin map showing pervious surfaces, impervious surfaces, and pollution generating impervious surfaces. Update flow control calculations to account for a fully paved 16’ drive aisle for the extents of the project. You might want to consider the use of pervious pavement for the drive aisle. Explain how flow control for the driveway drainage is being provided. The geotechnical report states that an overflow system shall be included in the design. Revise design or provide geotechnical support for a design without an overflow system. Provide a copy of the updated erosion control plan in report. Provide a completed bond quantity worksheet in the report. The City is using a new bond quantity worksheet. It has been included with these comments. Include maintenance requirements for catch basins from Appendix A of the 2009 KCSWDM. Address all other TIR redlines.