HomeMy WebLinkAbout2005-05-15 BRAA Ltr to OPHBonestroo
Rowe
Anderlik &
Associates
En & Architects
Ma 15, 2005
35 West Hi 36 n St. Paul, MN 55113
Office: 651-636-4600 w Fax: 651-636-1311
www.bonestroo.com
Mr. Eric Jolmson
Cit Administrator
Cit of Oak Park Hei
14168 Oak Park Blvd., P.O. Box 2007
Oak Park. H el L) (Yhts, MN 5 5 082-2007
Re: Oak Villa General Plan Review
BRA File No. 55-05-000
Dear Eric:
We have reviewed the g eneral plans, dated April 26, 2006, for the Oak Villa
development as submitted b Folz, Freeman, Erickson, Inc. Followin are our
comments and/or recommendations.
Development Comments
1. The streets, sanitar sewer,, water main and majorit of the storm sewer will be
privatel owned. The exception is all storm sewer that connects trunk storm
water ponds will be owned b the Cit
,Sheet 2
1. The south cul-de-sac is shown with a 42' radius. A 45' radius is the minimum
re for public cul-de-sacs in the Cit It should be verified b the fire chief
that this radius is acceptable for maneuverin emer vehicles.
Sh 4
1. Spot elevations should be shown for the top and bottom of all retainin walls.
Detailed desi drawin and calculations for an retainin walls over 3.0 feet tall
shall be submitted to the Cit for review and approval prior to construction.
2. The g radin g contours on the west side of the wetland g o from 940 directl to 944.
It appears the 942 contour is missin
3. Clearl define the wetland boundar and provide verification that proper wetland
setbacks and buffers are bein met.
4. Verif that all slopes are 3:1 or less. It appears there are slopes g reater than 3:1 in
the southwest comer of the propert and j ust southwest of the north pond.
St. Paul, St. Cloud, Rochester, MN w Milwaukee, Wl E Chica IL
Affirmative Action/E Opportunit Emplo and Emplo Owned
5. Label the Emergency overflow Routes.
6. Identify some spot elevations and drainage arrows, especially in critical drainage
locations such as south of units 52 -54. At this location the overland drainage
appears to be minimal.
7. The existing southwest NURP Pond is being significantly reduced. Show the
proposed grading plan for this pond and provide information on its water duality,
treatment. The existing drainage area to the pond is being maintained, however
the size of the pond is being reduced.
8. The southeast NURP pond and the existing wetland are labeled with a NWI, of
936.0 and the southwest NURP pond is labeled with a NWL of 937.7. However,
the contours shown in this area are not corresponding with the blue area shown on
the plans as the NWL of the ponds.
Sheet 7
1. With the construction of Nova Scotia Avenue North the City will install the
following items that will be paid for by the oakgreen village development:
a. Three 8 "water main stubs extended to the right-of-way.
b. Concrete curb and gutter radii at the two entrances to the development,
c. The bituminous pathway in the east boulevard of Nova Scotia.
2. The plans currently show the connection of the water main in Nova Scotia
Avenue. This should be revised to show the connection at the right of way.
3. The drainage area to the existing wetland is being decreased with the grading of
the site. To maintain hydrology to the wetland the outlet for the south ponding
system should be placed on the existing wetland, rather than on the east NURP
pond as currently dravrn. This will allow both the Past and the west I\TI JRP
Ponds to discharge into the wetland. To maximize the upland buffer
surrounding the wetland it is recommend the outlet be placed at 935.50.
4. Inlet FES 103 in the proposed north pond is directly across from the outlet. This
configuration decreases the treatment capabilities of the pond. The inlet /outlet
locations should be moved to maximize the hydraulic length between the two
structures.
5. Both the sanitary sewer and storm sewer pass between units 39 and 40 and
between units 51 and 52. The pipes are approximately 15' deep relative to the
finish floor elevations of the units. The plans show only 10' between the pipes
and the buildings. At these depths there should be a minimum of 15' :From the
utilities to the buildings.
6. In the H model a 15" and 8" submer pipe are shown in the outlet for
the south pond and north pond, respectivel The primar outlet for the south
pond is 15" RCP and 12" RCP for the north pond. Submer pipes easil fill
with sediment and debris, therefore to maintain capacit to the primar outlets the
minimize size for the submer pipes shall be 24".
Plat
1. The storm sewer from pond to pond and the storm sewer outlet from the proposed
north pond to the existin s will part of the Cit public infrastructure. A
30' utilit casement will be re for this s
General Comments
1. The additional items shall be submitted for review:
a. Pipe profiles for public storm sewer.
b. Details, includin outlet structures.
c. T Section for Roads.
d. Erosion Control Plan includin native seed mixture for upland area
surroundin the wetland.
e. Cop of the Approval letter from the Middle St. Croix Watershed.
The plans will re further review when items discussed in this letter are submitted.
If y ou have an q uestions or re additional information, please contact me at (651)
604-4788 or Dennis Postler at (651 604-4815.
Sincerel
BONE TROO, ROSENE, ANDERLIK & ASSOCIATES, INC.
BONE S,
area S. Erickson, P.E.
cc Tom Ozzello, Public Works Director
Jim Butler, Buildin Official
Scott Richards, Cit Planner
Mark Vierlin Cit Attorne
Todd Erickson -Folz5 Freeman Erickson, Inc.
DMP, BMK, File — Bonestroo & Associates
K:1 551 55private\oak Villa g eneral plans 5-15-06