Incomplete Letter 02-04-2014CITY OF
CHANHAS3E[V
7700 Market Boulevard
PO Box 147
Chanhassen, MN 55317
Administration
Phone: 952 227.1100
Fax: 952.227.1110
Building Inspections
Phone: 952.227.1180
Fax: 952.227.1190
Engineering
Phone: 952.227.1160
Fax: 952.227.1170
Finance
Phone: 952.227.1140
Fax: 952.227.1110
Park & Recreation
Phone: 952.227.1120
Fax: 952.227.1110
Recreation Center
2310 Coulter Boulevard
Phone: 952.227.1400
Fax: 952.227.1404
Planning &
Natural Resources
Phone: 952.227.1130
Fax: 952.2271110
Public Works
7901 Park Place
Phone: 952.227.1300
Fax: 952.227.1310
Senior Center
Phone: 952.227.1125
Fax: 952.227.1110
Web Site
wwau chanhassen. m n.us
February 4, 2014
Mr. Steve Kroiss
Dogwood Road, LLC
5605 Zumbra Drive
Excelsior, MN 55331
RE: Arbor Cove Submittal — Planning Case 2014 -06
Dear Mr. Kroiss:
We have reviewed the materials provided by Otto Associates in the application. This
letter is to inform you that, after having reviewed the submittal materials, we find the
application to be incomplete. Therefore, we cannot schedule you for a public hearing
until all the information is provided. The following items need to be addressed with
any subsequent submittal.
1. The existing concentrated flow condition is not addressed in the model.
2. The existing and proposed drainage condition is not being contained within any
drainage easement.
The submittal does not show that there is adequate separation, vertically or
horizontally, between the high water level within the drainage way and the low
floor building elevation on the proposed Lot 2. This existing drainage must be
accommodated for within a drainage easement and in a manner that provides
adequate protection from flooding and erosion. It is likely that this will require
adjustment of lot lines.
4. The wetland drainage is being routed into the biofiltration feature. This water is
not in need of treatment.
5. The model indicated that drainage area P4 will be routed to the proposed
biolfiltration feature. This does not appear to accurately reflect the proposed
conditions.
6. The model does not use an appropriate curve number for the wetland area.
7. The model does not consider the drainage way as a reach.
8. The model assumes an exfiltration rate of 0.60 "/hour. The nearest boring logs
indicate a profile of (CL) sandy lean clay or lean clay with sand to a depth of 21
feet. The Minnesota Stormwater Manual indicates this to be a D soil with
infiltration rates as low as 0.06 "/hour. Even if soils corrections were to be
provided, it seems unlikely that this area could achieve infiltration rates in excess
of 0.2 "/hour.
Chanhassen is a Community for Life - Providing for Today and Planning for Tomorrow
Mr. Steve Kroiss
February 4, 2014
Page 2
9. The plans indicate, as evidenced by note #2 on sheets 2 and 3, that the lots will be custom
graded. Given the sensitivity to the drainage patterns and storm water treatment, custom
grading is not appropriate. The wetland delineation performed for the Arbors was performed
seven (7) years ago and, with the development of the Arbors, conditions have significantly
changed in that area. In addition, there is no clear evidence as to the extent of the wetland
review area. At a minimum, the original boundary will need to be staked and reviewed for
accuracy.
10. Canopy coverage for this property appears to be close to 100 %. For a low density
subdivision the tree preservation requirement is 55% of the total coverage. From looking at
the grading plan, preservation appears to fall far short. They will need to try to meet the
minimum requirements.
11. The tree preservation area proposed does not adequately protect the forested parts of the lots.
The proposed conservation easement is not acceptable. At a minimum the rear 50 -70 feet of
each lot should be covered by a conservation easement. The boundary should more closely
follow the grading limits.
12. Provide hard coverage calculations based on the preliminary grading plan for each lot.
13. The house types for Lots 2 and 3 should be designated as side walkouts (SWO) and Lot 5
should be designated a side lookout (SLO).
Once you have assembled the information and revised the plans as appropriate, please resubmit
you application. If you have any questions or need additional information, please contact me,
bgenerousna,ci.chanhassen.mn.us or (952) 227 -1131, or Terry Jeffery, Water Resources
Coordinator, at tiefferv( �ci.chanhassen.mn.us or (952) 227 -1168.
Sincerely,
`V
Robert Generous, AICP
Senior Planner
ec: Kate Aanenson, Community Development Director
Alyson Fauske, Assistant City Engineer
Todd Gerhardt, City Manager
Terry Jeffery, Water Resources Coordinator
Cara Otto, Otto and Associates
Jill Sinclair, Natural Resources Coordinator
gAplan\2014 planning cases\2014 -06 arbor cove\incomplete letter.doex