Memo from LSA Design 5-25-07
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MEMORANDUM
CITY OF CHANHASSEN
RECEIVED
DfSIGn
MAY 3 0 2007
CHANHASSEN PLANNING OEPT
To:
From:
Project:
Subject:
Date:
City of Chanhassen~ ~
Kyle Williams, AlA .
SouthWest Village
Final Plat submittal- follow-up information
May 25, 2007
Please accept the enclosed plans and documentation as our follow-up submittal, on behalf of
Southwest Transit, for Final Plat approval of the SouthWest Village development in
Chanhassen.
· This memo with an LHB memo and LHB storm water calculations attached.
· Civil Engineering plans for grading and utilities were submitted on May 17, 2007. These
drawings are included on the attached CD.
· Revised Final Plat documents
o Five sets of the final plat, folded, 2 sheets each.
o .tif documents included on the attached CD
The following is a copy of the City of Chanhassen conditions of Preliminary Plat approval dated
May 16, 2006. Responses to the conditions are in italics.
RECOMMENDED CONDITIONS OF APPROVAL
Staff recommends approval of the preliminary plat for Southwest Village subject to the following
conditions:
1. The preliminary plat must be revised to include a 25-foot wide drainage and utility easement over
the sanitary sewer and watermain along Highway 101, south of the Southwest Station entrance
and a 20-foot wide drainage and utility easement over the storm sewer in the northern portion of
the property.
The Final Plat has been modified to include a 25ft easement along TH101 along the easterly
side of Outlot C.
The Final Plat includes the storm easement in the northern portion of the property. Per
MnDOT's request, it varies from 52ft wide to 30ft wide.
2. Encroachment agreements are required for the two drainage and utility easements due to the
extensive landscaping and sidewalk proposed.
3. The applicant must show how bus-passenger vehicle conflicts will be minimized along the east-
west access road.
There will be approximately four buses per hour at this site during peak morning and peak
afternoon hours. Buses travel along the bus only one-way road on the northeasterly portion
of the site and turn easterly onto the east! west access road noted above, and continue to the
intersection of Th101. Non-bus traffic will be controlled at each point of intersection along the
Planning I Architecture I Urban. Design I Landscape.Architecture
LSA DESIGN, INC. I 250 Third Ave. North, Suite 600 I Minneapolis, MN 55401 I 612.339.8729 I Fax: 612.339.7433 I www.lsadesigninc.com
bus route with stop signs: at the Y intersection, at the exits to the parking deck, and in the
future at the exits from the residential development. A stop sign, and right only sign will be
installed for all traffic at the east/west access road intersection of TH101.
4. Bus routes through the site must be clearly shown on the plans.
Plans submitted for building permit will graphically indicate the route described in Item 3
above.
5. On-street parking is not permitted on the private streets.
Recommend deleting this requirement because the Townhomes are no longer part of this plat.
6. The private street design must be adjusted to accommodate the turning movements of a fire truck
and a moving van.
Recommend deleting this requirement because the Townhomes are no longer part of this plat.
7. The grading plan must show proposed contours, minimum two-foot contour intervals and
proposed retaining walls, includingthe top and bottom of wall elevations.
Please see the attached memo from LHB Engineers for responses to this section.
8. The grading plan must identify the proposed grades on each level of the parking ramp.
Please see the attached memo from LHB Engineers for responses to this section.
9. Note the lowest floor elevation of the proposed town home units and include a grading detail
showing hold down information.
Recommend deleting this requirement because the Townhomes are no longer part of this plat.
10. Spot elevations must be shown along the east curb of the commercial area to ensure that the
parking and drive aisle area meets the minimum slope requirement.
Please see the attached memo from LHB Engineers for responses to this section.
II. The first 30 feet of each private street extending from the access drive must be minimum 3%.
Recommend deleting this requirement because the Townhomes are no longer part of this plat.
12. The sidewalks and trails shown within the public Right-of-Way shall be privately owned and
maintained.
13. A catch basin must be installed at the ingress at Highway 101 and the storm sewer adjusted
accordingly.
Please see the attached memo from LHB Engineers for responses to this section.
14. The developer must submit written confirmation with the final plat application indicating that the
MNDOT pond located in the south loop of the Highway 101 ramp has been sized to
accommodate runoff from this development.
Please see the attached memo from LHB Engineers for responses to this section.
15. Hydraulic calculations must be submitted with the final plat submittals and must include storm
sewer inlet capacity analysis to verify that 100% of the runoff from a IO-year event can be
captured.
Please see the attached memo from LHB Engineers for responses to this section, and
attached calculations. A storm water calculation summary of the actual development,
including the previously proposed Townhome development is attached as well. This
calculation is included to estimate the actual runoff on a fully developed site.
16. The developer must verify that the proposed eight inch watermain will provide sufficient flow for
the proposed residential, commercial and sprinkling uses on the site.
Please see the attached memo from LHB Engineers for responses to this section.
17. The utility plan must be revised to show the following:
Please see the attached memo from LHB Engineers for responses to these items.
a. Show the proposed water service to the bus station.
b. Due to differential settlement, the three valves and the sanitary sewer manhole must not
lie within the proposed paver-block circle at the intersection of the access road at the
western private driveway intersection. The valves can be relocated outside of the paver-
block circle. Sanitary sewer manhole 503 can be installed to the north of the paver-block
circle and an additional manhole can be installed to the west of the paver-block circle.
c. Sanitary sewer manhole 501 must not lie within the sidewalk.
d. Eliminate the 90 degree bend in the watermain at the Highway 101 intersection and
replace with two, 45 degree bends.
e. The final utility plan must show the sewer and water services to the townhome units.
f. The lowest floor elevation of each unit must be shown on the utility plan.
18. MNDOT will be invoicing the City for a portion of the utility improvements for this
development. The developer must pay for 100% of the invoices that the City receives for this
work.
We have had a brief preliminary discussion with City staff regarding this item, and understand
the improvements in question are the turn lane into the site from TH101 and the signal at
Lyman and 101. SouthWest Transit requested, and staff agreed, to discuss and clarify this
proposed assessment prior to Council's action. The purposed of the discussion is to clarify
the amounts of those improvements, and the contribution SW Transit has already made to
MnDOT for those improvements, and others, as result of this development.
19. Each new lot is subject to the sanitary sewer and water hookup charges. These fees are collected
with the building permit and are based on the rates in effect at the time of building permit
application. The party applying for the building permit is responsible for payment of these fees.
enclosures
cc: 0501.4
21 West Superior Street, Suite 500
Duluth, Minnesota 55802
218727-8446
Fax 218727-8456
WWW.LHBcorp.com
250 3rd Avenue North, Suite 450
Minneapolis, Minnesota 55401
612338-2029
Fax 612 338-2088
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218727-8446
Fax 218727-8456
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Minneapolis, Minnesota 5540 I
612338-2029
Fax 612 338-2088
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Tributar
TrCin~iL(~ot 1)
RetCii1_ <hQt?)
ljousiD_g (Outl()LC)
Ql.Jt1ot A: IH_l01-bY!!larl!toad
Qu!Lot A~f'.,I~S BuswaYn
Outlot A: RetailfTransit
Outlot B
Total
Notes:
1. Tributary based upon Preliminary Plat of SW Village dated 5-3-06
2. Transit includes station, parking structure, bus loading, plaza, and landscaping
3. Retail includes buildings, plaza, and landscaping areas computed from Site Plan Review
4. Housing areas computed from Site Plan Review
5. TH 101-Lyman Road includes truck loading bump-out
6. RetailfTransit tributary includes retail/garage access road, open-air parking, plaza, and landscaping
7. C refers to Manning's Runoff Coefficient
.
,
SOUTHWEST VILLAGE
Stormwater Contribution Calculations
% Total
Area
31.0%
9.5%
27.6!o,
..~ .90/0., n_
3.0oM
4.1%
17.9%1
100.0%:
Total
135,093 .
41,474
120,598
29,9.88
13,184
17,700
78 203
436,240
Area (SF)
14,379 .
6,312
38,802
2,9f3t5i
2,9'7.8-1
1,374 .
78 203
145,033
Weighted
C
0.875
0.843
0.725
.. O.8f30i
0.792 (
0.896
0.250 '
1m ervious Pervious
120,714
35,162
81,796
27,003
10,206
16,326 .
291,207
Wt.Cx
Area
118,273 .
34,963 .
87,434
2_6,3f!!lj _
. 1Q,'Hg_l_
15,859 i
19551
312,910
% Storm
Water
Runoff
37.8%
11.2%
27.9%
8.4%
.--------
3.3%
5.1%
6.3%
100.0%
updated 02.22.2007
250 Third Avenue North, Ste 450
Minneapolis, Minnesota 55401
612338-2029
Fax 612 338-2088
www.LHBcorp.com
MEMORANDUM
DATE: May 25, 2007
TO: Kyle Williams, LSA Design
FROM: Nick DeBar
RE: SW Village Preliminary Plat Review
The following are LHB's responses (in italics) to the City of Chanhassen's preliminary plat
review for SW Village dated May 16,2006:
GRADING AND DRAINAGE
The grading plan is incomplete. It must show proposed contours, minimum two-foot contour
intervals and the proposed grades on each level of the parking ramp.
Current grading plan shows proposed contours in onefoot increments.
Note the lowest floor elevation of the proposed townhome units and include a grading detail
showing hold down information.
Townhome development is no longer a part of this plat.
Spot elevations must be shown along the east curb of the commercial area to ensure that the
parking and drive aisle area meets the minimum slope requirement.
Current grading plan shows spot elevations along emt curb.
The first 30 feet of each private street extending from the access drive must be minimum 3%.
Townhome development is no longer a part of this plat.
A catch basin must be installed at the ingress at Highway 101 and the storm sewer adjusted
accordingly.
Catch basins were constructed by ZRC on both curb lines at entrance to TH 101.
The developer indicated that the proposed MNDOT pond located in the south loop of the
Highway !OI ramp has been sized to accommodate runoff from this site. According to the
developer, the design of this pond assumed 100% impervious surface, post-development from this
site. The developer must submit written confirmation from MNDOT that runoff from this
development can go to this pond.
Confirmation wm provided after the preliminary plat was submitted. Contact Mary Lacho at
MnDOT (952.368.5610) with any further questions.
Hydraulic calculations must be submitted with the final plat submittals and must include storm
sewer inlet capacity analysis to verify that 100% of the runoff from a 10-year event can be
captured.
Attached.
Duluth. MN
Minneapolis. MN
"'
.
RE: SW Village Preliminary Plat Review
Page 2
RETAINING WALLS
Staff is unable to determine if retaining walls are required or proposed on the site since the
grading plan is currently incomplete.
No retaining walls needed as shown on current grading plan
ill ILITIES
The developer must verify that the proposed eight inch watermain will provide sufficient flow for
the proposed residential, commercial and sprinkling uses on the site.
As engineers of record. we confirmed the water main was adequately sized.
The utility plan must be revised to show the following:
a) Show the proposed water service to the bus station.
Completed - shown on current site improvement plan.
b) Due to differential settlement, the three valves and the sanitary sewer manhole must not
lie within the proposed paver-block circle at the intersection of the access road at the
western private driveway intersection. The valves can be relocated outside of the paver-
block circle. Sanitary sewer manhole 503 can be installed to the north of the paver-block
circle and an additional manhole can be installed to the west of the paver-block circle.
The paver-block circle is no longer proposed.
c) Sanitary sewer manhole 501 must not lie within the sidewalk.
Townhome Development is no longer a part of this plat.
d) Eliminate the 90 degree bend in the watermain at the Highway 101 intersection and
replace with two, 45 degree bends.
Water main in this area was designed and constructed as part of ZRC work.
e) The final utility plan must show the sewer and water services to the townhome units.
Townhome Development is no longer a part of this plat.
f) The lowest floor elevation of each unit must be shown on the utility plan.
Townhome Development is no longer part of this plat.
c: LHB File No.: 04417.32-F202
M :\04Pro j\04417\A DMN\F200\Me 1m \Pre limP latRe vRespo nse_07 -0525 .doc
Duluth. MN
Minneapolis. MN