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Home My WebLink About2017-08-08 City Engineer Plan & Drainage Design Review - 2nd Submittal Stantec Consulting Services Inc. 2335 Highway 36 West St.Paul MN 55113 Stantec Tel: (651) 636-4600 Fax: (651) 636-1311 August 8, 2017 Mr. Eric Johnson,Administrator City of Oak Park Heights 14168 Oak Park Blvd.N.,P.O.Box 2007 Oak Park Heights,MN 55082-2007 Reference: Oak Park Senior Living Phase 5 -Plan and Drainage Design Review, 2nd Submittal Dear Eric, We have reviewed the plans and drainage calculations submitted regarding the proposed Oak Park Senior Living Phase 5 development re-submitted on 8/4/2017. Following are our comments and recommendations: Stormwater/Drainage Stormwater comments provided by Tyler Johnson-Tyler.Johnson@stantec.com. 1. The project is subject to review by the Middle St.Croix Watershed Management Organization.Approval by the City will be contingent on receiving approval from the MSCWMO based on their comments to the City from the June 8th, 2017 review letter for the project. The City shall be provided a copy of the permit approval letter from the MSCWMO prior to construction activity. 2. In the proposed conditions of the HydroCAD model,it appears area P6 is being proposed primarily as a Meadow,non-grazed, HSG"B"type soil. Based on the supplied soil borings from Braun Intertec,this area appears to be made up of Clayey Sand(SC) and Silty Clay (CL/ML)soils.This displays a soil characteristic of HSG C. Please update the HydroCAD model to reflect this. 3. The existing site runoff tables and the HydroCAD values don't appear to match. Please verify the rate control tables and update them to match the HydroCAD models in the appendices. 4. For the proposed storm sewer design calculations, CB-2 to MH-1, CB-3 to MH-1, and MH- 1 to FES all appear to be undersized for the 10-year event.The notes state that the undersized pipes are designed for rate control in depressed grass areas.What depressed grass areas are being referred to?All of these catch basins are within the driveways or parking lots. 5. For the utility plan,calculations should be provided showing adequate conveyance for the 10-year storm for all proposed storm sewer lines.This includes the inline drain segment west of the proposed building, CB-1 to the EX.CB connection, and CB-4 to the tie into the existing storm sewer system. -,c'SSC.11 with coll-nunIty in t 1fl't` Mr.Eric Johnson Page 2 of 3 Reference: Oak Park Senior Living Phase 5—Plan and Drainage Design Review,2nd Submittal 6. Labeling of structures between the stormwater calculations and the utility plan needs to be consistent. Sheet Ci— Demolition Plan 1. The note provided for bulkheading the storm sewer where the existing pipe is removed is not entirely clear. Denote the bulkhead on the plan view. Revise the note to indicate the existing pipe being cut on the outside of the manhole and bulkheaded with standard manhole bricks and morter,mortared inside the manhole and outside the manhole, creating a flush surface inside the manhole. Include in the note that the City's inspector shall be present for the bulkheading operation. Do not remove the existing pipe. Sheet C2 — Paving and Dimension Plan i. Install pedestrian ramps per City Detail Plate STR-7 where sidewalks meet roadways, driveways and parking lots. Sheet C2.1, C2.2— Fire Truck Turning Display i. Sheet 2.1 and Sheet 2.2 do not match the change made to the most westerly parking lot island(radius change and surmountable curb). No changes appear to have been made to the easterly island and the curb radius at the northwest corner of the Park Area. Fire Department to confirm adequacy of fire lanes and circulation. Sheet C3 -Grading and Erosion Control Plan i. The stormwater facilities proposed for the site,including facilities that encroach into the pond area at the north end of the property shall be considered private and shall be owned and maintained by the Owner. 2. The City reserves the right to require additional erosion control measures as determined/necessary during the construction of the project. 3. The pond on the north side of the site will need to have sediment that has been deposited in the pond removed. Sheet C4 -Utility Plan i. Connections to the City's sewer and water systems shall be per the City's standards and detail plates. The City or its designee shall be present for water and sanitary sewer service connections to the City's systems. Testing will be per City requirements. 3,,,rr„,(If'.v.tt t !:,',L,r)f`.,Y 1C= A,1ti Mr.Eric Johnson Page 3 of 3 Reference:Oak Park Senior Living Phase 5-Plan and Drainage Design Review,2nd Submittal 2. The watermain,hydrants,storm sewer and sanitary sewer that serve the site will be private and maintained by the owner. Sheet C5 and C6 —Details 1. Comments addressed. General Comments 1. The City reserves the right to inspect the construction of the project. The City or its designee shall be present for water and sanitary sewer service connections to the City's systems. 2. The Owner will need to comply with all requirements of the NPDES Construction Stormwater Permit and the Middle St. Croix Watershed Management Organization. The City reserves the right to require additional erosion control measures as determined/necessary during the construction of the project. 3. Lighting and landscaping to be reviewed by others. 4. The Owner shall be responsible for obtaining all required permits. If you have any questions or require further information,please do not hesitate to contact me. Regards, STANTEC CONSULTING SERVICES INC. 2/1‘144"-k----- Lee M.Mann, P.E. City Engineer Phone: 651-604-4850 lee.mann@stantec.com cc: Andy Kegley,Public Works Director Julie Hultman, Building Official Scott Richards, City Planner Mark Vierling,City Attorney Lisa Danielson,City Arborist Julie Hultman From: Eric Johnson Sent: Wednesday,August 9, 2017 2:56 PM To: Mann, Lee Cc: Andrew Kegley;Julie Hultman; Scott Richards (Scott@PlanningCo.com); Mark Vierling (MVierling@eckberglammers.com); Lisa Danielson Subject: RE: Oak Park Senior Living Phase 5 I will forward to Mr. Nolde From: Mann, Lee [mailto:Lee.Mann@stantec.com] Sent:Tuesday,August 8, 2017 1:12 PM To: Eric Johnson<eajohnson@cityofoakparkheights.com> Cc:Andrew Kegley<akegley@cityofoakparkheights.com>;Julie Hultman <jhultman@cityofoakparkheights.com>;Scott Richards(Scott@PlanningCo.com)<Scott@PlanningCo.com>; Mark Vierling(MVierling@eckberglammers.com) <MVierling@eckberglammers.com>; Lisa Danielson <LDanielson@cityofoakparkheights.com> 3011 Subject:Oak Park Senior Living Phase 5 Eric, Attached are our comments regarding Oak Park Senior Living Phase 5. Let me know if you have any questions. v Mann i - MN, W ; b a Principal Stantec 2335 Highway 36 West,St. Paul MN 55113-3819 Phone: (651) 604-4850 Cell: (651) 775-5956 Lee.Mann@stantec.com tec The content of this email is the confidential property of Stantec and should not be copied,modified,retransmitted,or used for any purpose except with Stantec's written authorization.If you are not the intended recipient,please delete all copies and notify us immediately. 4,Please sia the environment before r .'Finn this em^ii. 1