HomeMy WebLinkAbout2004-08-17 BRRA Ltr to OPH Re Grading & UtilitiesBonestroo
Rosene
Anderlilc &
Associates
En & Architects
Au 17, 2004
Bonestroo, Rosene, Anderlik and Associates, Inc. is af rmative Action/E Opportunit Emplo
and Emplo Owned
Principals: Otto G Bonestroo, PE. ■ Marvin L Sorvala, PE ■ Glenn R. Cook, PE. ■ Robert G. Schunicht, PE_ ■
Jerr A. Bourdon, P.E. ■ Mark A. Hanson, P.E.
Senior Consultants: Robert W Rosene, P.E. ■ Joseph C. Anderlik, P1. ■ Richard E. Turner, PE_ ■ Susan M. [berlin, CYA.
Associate Principals: Keith A. Gordon, PE. ■ Robert R. Pfefferle, PE_ ■ Richard W. Foster, PE. ■ David 0, Loskota, RE- ■
Michael T. Rautmann, PE_ ■ Ted K. Field, PE, ■ Kenneth P Anderson, FE. ■ Mark R. Rolfs, PE. ■ David A. Bonestroo, M.B.A. ■
Sidne P Williamson, PE., L.S. ■ A M. Rin M.B.A. ■ Allan Rick Schmidt -Thomas W Peterson, P.E. ■
James R. Maland, PE. Miles B. Jensen, PE_ ■ L. Phillip Gravel 111, PE. ■ Schmidt
J. Ed PE. -, Ismael Martinez, PE. ■
Thomas A. S PE. ■ Sheldon J. Johnson ■ Dale A. Grove, PE. homas A. Roushar, P.E. ■ Robert J. Dever PE.
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O w ffices: St. Paul, St. Cloud, Rochester and Willmar, MN ■ aukee, h
Website: www.bonestroo.com
Mr. Eric Johnson, Administrator
Cit of Oak Park Hei
14168 Oak Park Boulevard
P.O. Box 2007
Oak Park Hei MN 55082-2007
Re: Fox Hollow P.U.D
Gradin Plan and Utilities Review
BRA File No. 55-04-000
Dear Eric:
10 #
Gm
We have reviewed the g radin g , pondin erosion control and utilit plans for the proposed Fox
Hollow development as submitted b Stevens En and have the followin comments
and/or recommendations for y our consideration:
Site La and Utilit Plan- Sheet 2 of 7
1. Is the flow of traffic around the island located in the northwest corner of the parkin lot
one wa or two wa
2. In the northwest comer of the parkin lot there are several stalls that are onl 15.3'. Are
these stalls for compact cars onl
3. The handicapped stalls re accessible aisles. An van accessible parkin spots need
to 'be posted as such.
4. The handicapped space that is located in a parallel parkin space should be a total of 13
feet wide.
5. Where are the locations of the curb ramps?
6. The handicapped parkin si and the pavement markin for the east handicapped spot
is not shown on the same parkin stall.
7. What t of curb and g utter is bein installed?
8. There shall be a minimum of 5 feet of separation between an buildin and the back
of curb.
2335 West Hi 36 ■ St. Paul, MN 55113 ■ 651-636-4600 z Fax: 651-636-1311
9. An y 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 bein g made to the existing main along bo 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
retainin g wall. 'I`he detail for this is not yet shown on the detail sheets.
Gradin Drain. e 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
p
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 snowed 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 ** I maintenance bench.
G. 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 p lans 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 activi
q ty 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.
1 0. 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 S WPPP :
a. Stockpile protection
b. Inlet protection
Tent orar 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 3885 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 p rovide capacity during the interim and ultimate conditions the minimum. required
slope of the proposed 12" PVC sanitary sewer is 1.0%.
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 V 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
pp
retainin g wall. Rather than crossing the retaining wall at approximately a 45' i angle, t
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,
BON STROO, ROSENE, ANDERLIK &ASSOCIATES INC
a
Karen S. Erickson, P.E.
cc: Tom Ozzello, Public works Director
Jinn 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
KA551 5504000 lWork_In_ProgressVolinson_KSE ^ fox hollow pud 8- 17- 04.doc