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Home My WebLink About2004-08-17 BRAA Ltr to OPH Re Grading Plan & Utilities Review 4 • Bonestroo, Rosene, Anderlik and Associates, Inc. iseffirmative Action /Equal Opportunity Employer n Bonestroo and Employee Owned Principals: Otto G. Bonestroo, PE. • Marvin L. Sorvala. P.E. • Glenn R. Cook, P.E. • Robert G. Schunicht, P.E. • MI R/�osene Jerry A. Bourdon, P.E. • Mark A. Hanson, P.E. il Anderlik & Senior Consultants: Robert W. Rosene, PE. • Joseph C. Anderlik, P.E. • Richard E. Turner, P.E. • Susan M. Eberlin, C.P.A. Associate Principals: Keith A. Gordon, P.E. • Robert R. Pfefferle, P.E. • Richard W Foster, P.E. • David O. Loskota, P.E. • Associates Michael T. Rautmann, RE. • Ted K. Field, P.E. • Kenneth P Anderson, P.E. • Mark R. Rolfs, P.E. • David A. Bonestroo, M.B.A. - Sidney P Williamson, PE., L.S. • Agnes M. Ring, M.B.A. • Allan Rick Schmidt, P.E. • Thomas W. Peterson, P.E. • Engineers& Architects James R. Maland, P.E. • Miles B. Jensen, P.E. • L. Phillip Gravel III, RE. • Daniel J. Edgerton, P.E. • Ismael Martinez, P.E. - Thomas A. Syfko, PE. • Sheldon J. Johnson • Dale A. Grove, P.E. • Thomas A. Roushar, P.E. • Robert J. Devery, P.E. Offices: St. Paul, St. Cloud, Rochester and Willmar, MN • Milwaukee, WI • Chicago, IL Website: www.bonestroo.com August l 7, 2004 • RECEIVED Ai60 1 8 2Q 4 Mr. Eric Johnson, Administrator City of Oak Park Heights 14168 Oak Park Boulevard P.O. Box 2007 Oak Park Heights, MN 55082 -2007 Re: Fox Hollow P.U.D Grading Plan and Utilities Review BRA File No. 55 -04 -000 Dear Eric: We have reviewed the grading, ponding, erosion control and utility plans for the proposed Fox Hollow development as submitted by Stevens Engineering and have the following comments and/or recommendations for your consideration: - Site Layout and Utility Plan- Sheet 2 of 7 1. Is the flow of traffic around the island located in the northwest corner of the parking lot one way or two way? 2. In the northwest corner of the parking lot there are several stalls that are only 15.3'. Are these stalls for compact cars only? 3. The handicapped stalls require accessible aisles. Any van accessible parking spots need to be posted as such. 4. The handicapped space that is located in a parallel parking space should be a total of 13 feet wide. 5. Where are the locations of the curb ramps? 6. The handicapped parking sign and the pavement marking for the east handicapped spot is not shown on the same parking stall. 7. What type of curb and gutter is being installed? 8. There shall be a minimum of 5 feet of separation between any building /wall and the back of curb. 2335 West Highway 36 • St. Paul, MN 55113 • 651 - 636 -4600 • Fax: 651-636-1311 • • 9. Any curb box located in pavement shall have a cover. The recommended cover is a Ford Type A 1 single locking lid. 10. The curb box for the east office building is drawn on the property line rather than the water service. 11. How is the connection being made to the existing main along 60 Street? Is it a wet tap? 12. Approval must be obtained from the Building Inspector and Fire Department that each building has the appropriately sized water main/service for fire protection. 13. All water main shall have 7.5 feet of cover. 14. There is a description of a storm sewer pipe being placed flush with the face of the retaining wall. The detail for this is not yet shown on the detail sheets. Grading, Drainage and Erosion Control- Sheet 3 of 7 1. The slopes on Xcel Energy property are labeled as 4:1; however, if these are 2 foot contours, as shown, then the slopes actually scale as 2:1. In addition, the 6:1 slopes in this area are actually 3:1. 2. Slopes shall not exceed 3:1 in any areas that are to be mowed and/or within any drainage and utility easement. 3. The design and construction of the proposed retaining walls are the responsibility of the developer's engineer. Detailed design drawings and calculations for these walls shall be submitted to the City for review and approval prior to construction. 4. Under existing conditions it appears that the overflow route for the existing pond is to the east. This direction should be maintained as the emergency overflow route for the proposed pond (the proposed pond's EOF appears to be to the south/southeast).. 5. The storm water pond is required to have a 10:1 maintenance bench. 6. On Note 2 the City of Hugo should be changed to Oak Park Heights. Storm Water Pollution Prevention Plan and Erosion Control Plans: 7. Each set of plans should include both a temporary and a permanent erosion control plan as required by the NPDES permit from the Minnesota Pollution Control Agency. This requirement is for any land disturbing activity greater than one acre, which includes this project. 8. Limits of clearing and grading should be indicated on the erosion and sediment control plans, both temporary and permanent. 9. Total impervious surface from proposed building, proposed parking area, and access drive should be provided. . • 10. Inspection reports should be routed to the City of Oak Park Heights weekly, or after each .5 inch rain event, whichever is more frequent. 11. Details for the following should be included in the plan set and the SWPPP: a. Stockpile protection b. Inlet protection Temporary Erosion Control Plan: 12. All silt fence locations should be more clearly defined on provided plans. In addition, we recommend silt fencing extend along the entire south and east portions of the site. 13. Machine type sliced silt fence (MnDOT 3886 B -2) should be the only acceptable practice. Also, detailed drawings should be provided in revised plan set, including metal fence posts if over winter construction activity. 14. Detailed drawings on all construction entrances should include a geotextile liner beneath the rock for proper performance standards. 15. Inlet protection devices shall be used on all catch basins, and curb and gutter openings. Details and locations should be provided. 16. Provide phased construction schedule. This is designed and intended to limit the amount of exposed land area at one time. 17. Define and locate on plan any temporary vegetation protection to be installed prior to commencing land grading activity. 18. If pond is to be used for temporary site dewatering purposes, silt fence should be located around the pond to control on site drainage. Permanent Erosion Control Plan: 19. All slopes that are 4:1 or steeper should be specified as stabilized with erosion control blanket within 7 days of final grade and should be clearly indicated on permanent erosion control plan. 20. Seeding and mulching of all open soil areas is critical to staging construction. No open soil shall be open longer than 14 or 21 days after final grading is complete, this should be indicated along with areas for revegetation on plan set. This time of exposure is dependent upon slope gradient. 21. Provide detail for controlled overflow of pond, both for temporary and permanent storm water storage. Sanitary Sewer Plan and Profile- Sheet 4 of 7 1. To provide capacity during the interim and ultimate conditions the minimum required slope of the proposed 12" PVC sanitary sewer is 1.0 %. • • 1 2. Information is required on the height and type of material for the risers. 3. The detail for the outside drop is not shown on the detail sheets. Storm Sewer Plan and Profile- Sheet 5 of 7 1. The plans call for placing a new 36" RCP storm sewer over the existing storm sewer. If this is the chosen design it is recommended that the existing storm sewer be completely removed; however, removal and replacement of the 36" storm sewer is very costly. Another option (and possibly a more economical one) is to keep the existing storm sewer in use and counter the additional fill by placing a concrete bridge directly over the top of the existing 36" storm sewer. 2. It is recommended that the outlet structure for the pond be located where it is easily accessible for maintenance. 3. The outlet structure for the pond has 2 -15" orifices located inside the structure. It is not clear if the design is to control rate during low flow events or to act as a skimmer. If this is for rate control an orifice should be placed at the normal water level. For skimming, it is recommend that a clearance of 1' be maintained between the NWL and the top of the skimming structure. 4. It appears that the pond outlet pipe may be in conflict with the footings of the retaining wall. Rather than crossing the retaining wall at approximately a 45° angle, it is recommended that the pipe cross the retaining wall at right angles. If you have any questions or require additional information, please contact me at (651) 604 -4788 or Dennis Postler at (651) 604 -4815. Sincerely, BO STROO, ROSENE, ANDERLIK & ASSOCIATES INC Karen S. Erickson, P.E. cc: Tom Ozzello, Public Works Director Jim Butler, Building Official Scott Richards, City Planner Mark Vierling, City Attorney Kathy Widin, City Arborist Todd A. Erickson — Folz, Freeman, Erickson, Inc. DMP, DDH, File — Bonestroo & Associates K: \55\ 5504000 \Work_In_ProgresslIohnson_KSE ^fox hollow pud 8- 17- 04.doc