FPR - memo to staffMEMORANDUM
CITY OF C HANHASSE N
Chanhassen is a Community for Life -Providing for Today and Planning for Tomorrow
TO: Alyson Fauske, Terry Jeffery, Mark Littfin, Jerry Mohn, Jill Sinclair
FROM: Robert Generous
DATE: November 11, 2016
SUBJ: Planning Case #05-14 - FPR Lake Harrison 3'd Addition
Please review the following conditions with the attached final plat for Lake Harrison 3" a Add and
respond to me no later than Thursday, December 1, 2016:
B. "Preliminary plat (Subdivision) to create 40 single-family lots, four outlots and public right-of-
way with of a variance for a private street and street grade, plans prepared by Westwood
Professional Services, Inc. dated 03/18/05, based on the findings of fact attached to the staff
report, subject to the following conditions:
1. The lot area for Lot 2, Block 1, shall be increased to a minimum of 15,000 square feet.
2. The lot frontage for Lot 3, Block 1, must meet the 90 feet standard at the building setback
line.
3. Lots 10, 11 and 12, Block 3, must be reconfigured to meet the minimum standards.
4. The lot frontage for Lot 14, Block 3, must meet the 125 minimum lot width if it is a lake
shore lot.
5. Lot 12, Block 3, contains a swimming pool and shall not be platted as a separate lot until the
pool is removed or the platting of the lot is concurrent with an application for a building
permit for a principal dwelling on the lot.
6. Prior to final plat approval, the developer shall verify that acceptable building pads can be
accommodated on all lots that have lake setbacks.
7. If Lot 1, Block 4, is not dedicated for park purposes, then the development shall pay full
park fees in force at the time of final plat approval
PH 952.227.1100 • www.ci.chanhassen.mn.us • FX 952.227.1110
7700 MARKET BOULEVARD • PO BOX 147 • CHANHASSEN • MINNESOTA 55317
8. Building Official Conditions:
a. A final grading plan and soils report must be submitted to the Inspections Division before
building permits will be issued.
b. Demolition permits must be obtained prior to demolishing any structures on the site.
c. The developer must submit a list of proposed street names for review and approval prior
to final plat of the property.
d. Retaining walls more than four feet high must be designed by a professional engineer and
a building permit must be obtained prior to construction.
c. Separate sewer and water services must be provided each lot.
f Existing wells and on-site sewage treatment systems on the site but be abandoned in
accordance with State Law and City Code and the existing home must be connected to
city sewer service when available.
g. The swimming pool adjacent to the existing residence must be protected by a fence in
accordance with City Code.
h. The developer must coordinate the address change of the existing home with the
construction of the development and provide access for emergency vehicles at all times.
9. A wetland delineation report illustrating wetland type, boundary and vegetation shall be
submitted prior to final plat approval.
10. The applicant shall submit a Wetland Conservation Act (WCA) application illustrating two
alternatives that demonstrate proposed plans were sequenced in the following order of
decreasing preference: 1) Avoidance of wetland impact, 2) Minimization of wetland impacts,
3) Rectification of wetland impacts and 4) Mitigation of wetland impacts. The applicant
shall not impact basins A, G and F until it is demonstrated that these impacts have met the
above sequencing requirements. Wetland replacement shall occur in a manner consistent with
the Minnesota Wetland Conservation Act (MR 8420). The plans shall show fixed photo
monitoring points for the replacement wetlands. A five-year wetland replacement monitoring
plan shall be submitted yearly beginning one growing season after the wetland is created.
The applicant shall provide proof of recording a Declaration of Restrictions and Covenants
for Replacement Wetland. The applicant shall secure City approval of a wetland replacement
plan prior to any wetland impacts occurring.
11. All impacts, including the filling of wetlands and conversion of wetlands into storm water
pond, shall be mitigated with the proposed project. The applicant shall demonstrate and
document how replacement will be satisfied to ensure the 2:1 replacement ratio for all
impacted wetlands.
12. A wetland buffer with a minimum width of 20 feet shall be maintained around Wetlands A,
B, C, E, F, G and H. A wetland buffer with a minimum width of 16.5 feet shall be
maintained around Wetland D and any wetland mitigation areas. Wetland buffer areas shall
be preserved, surveyed and staked in accordance with the City's wetland ordinance. The
applicant shall install wetland buffer edge signs, under the direction of City staff before
construction begins and shall pay the City $20 per sign.
13. Building setbacks of 40 feet from the wetland buffer strips shall be maintained for all
proposed building pads. Lot 3, Block 3 and Lot 11, Block 3 shall be revised to meet building
setback requirements.
14. Lots 11-15 Block 3 and Lot 10 Block 2 shall be revised to incorporate all of wetland B into
Outlot C.
15. The OHW determination shall be completed prior to final plat approval. All plans shall
illustrate Lake Harrison's OHW and a 150 foot structure setback from the OHW.
16. All non -riparian lots within the shoreland management zone shall be no less than 90 feet
wide with 15,000 square feet of lot area. All riparian lots within the shoreland management
zone shall be no less than 125 feet wide with 40,000 square feet of lot area.
17. The bluff area on the property shall be preserved. All structures must maintain a 30 foot
setback from the bluff and no grading may occur within the bluff impact zone (i.e., the bluff
and land located within 20 feet from the top of the bluff).
18. The proposed development shall maintain existing runoff rates. Storm water calculations
shall be submitted to ensure the proposed storm water ponding is sized adequately for the
proposed development.
19. Drainage and utility easements shall be provided over all existing wetlands, wetland
mitigation areas, buffer areas used as PVC and storm water ponds.
20. MN DOT category 3 erosion blanket and seed shall be applied to exposed creek slopes
near/around road crossing within 24 hours of temporary/final grade. Riprap, appropriately
sized, shall be installed at flared end outlets for energy dissipation with underlying gravel
base or geotextile fabric. All emergency over flow structures shall be stabilized with riprap
and geotextile or permanent turf re -enforcement blankets. Erosion and sediment controls
shall be installed for the planned sanitary sewer crossing for Wetland A area. Silt fence,
mulch and wetland seed shall be used for restoration. All 3:1 slopes shall be covered with
category 3 erosion blanket. An outlet meeting NPDES water quality discharge requirements
is needed on Pond 1.
21. Following storm water inlet installation Wimco-type (or equal) inlet sediment controls shall
be installed and regularly maintained. A detail for the inlet sediment controls shall be
provided.
22. Following street and utility installation, Chanhassen -specification Type -1 silt fence or other
approved perimeter sediment control shall be installed for all positive slopes curbside.
23. Geotextile fabric shall be installed under the rock to promote effectiveness and lifespan of the
rock construction entrance.
24. Chanhassen type 2 heavy duty silt fence with straw/hay bale re -enforcement shall be
provided for all silt fences adjacent to wetland and creek areas. Chanhassen type 1 silt fence
shall be installed at the OHW elevation of storm water basins following permanent outlet
installation.
25. The "Inlet Sediment Filter" detail shall be altered to show a rock berm (1 1/2 -inch rock, 2 feet
wide and 1 -foot -high along the outside of the silt fence. Only metal t -posts shall be used, not
wood stakes.
26. Silt fence shall be installed between wetland impact areas and the remaining wetland.
27. All exposed soil areas shall have temporary erosion protection or permanent cover year
round, according to the following table of slopes and time frames:
Type of Sloe
Time (Maximum time an area can
Steeper than 3:1
7 days remain open when the area
10:1 to 3:1
14 days is not actively being worked.)
Flatter than 10:1
21 days
These areas include constructed storm water management pond side slopes, and any exposed
soil areas with a positive slope to a storm water conveyance system, such as a curb and gutter
system, storm sewer inlet, temporary or permanent drainage ditch or other natural or man-
made systems that discharge to a surface water.
28. Street cleaning of soil tracked onto public streets shall include daily street scraping and street
sweeping as needed.
29. All development phases shall be represented in the SWPPP (clear and grubbing, mass
grading, large utilities, small utilities, home building, along with any special requirement
such as wetland or creek crossing areas).
30. Construction phasing of the road shall be provided for the wetland/creek crossing. Due to
potential concentrated flows, a creek crossing plan shall be developed and outlined in the
SWPPP. A detail shall also be provided. Stabilization of the crossing area shall be provided
within 24 hours following temporary or final grade. The silt fence shall be wrapped up and
around the culvert leaving the wetted perimeter free of silt fence. Soil shall be prevented
from entering the waters of the state.
31. At this time, the estimated total SWMP fee, due payable to the City at the time of final plat
recording, is $135,285.38.
32. The applicant shall apply for and obtain permits from the appropriate regulatory agencies (e.g.,
Riley -Purgatory -Bluff Creek Watershed District, Department of Health, Minnesota Pollution
Control Agency (NPDES Phase II Construction Permit), Minnesota Department of Natural
Resources (for dewatering), Carver County, Met Council) and comply with their conditions of
approval.
33. Tree preservation fence shall be installed at the edge of the grading limits prior to any
construction. Fencing shall be in place and maintained until all construction is completed. In
no areas shall the fencing be placed within the bluff impact zone.
34. Any trees removed in excess of proposed tree preservation plans, dated 3/18/05, will be
replaced at a ratio of 2:1 diameter inches.
35. A total of 319 trees are to be planted. The number of overstory, deciduous trees, as shown on
landscape plans dated 3/18/05, required in the front yard of each lot are as follows:
Lot, Block
Number of trees required
Lot 1, blk 1
5
Lot 2, blk 1
2
Lot 3, blk 1
1
Lot 4, blk 1
1
Lot 5, blk 1
1
Lot 6, blk 1
2
Lot 7, blk 1
2
Lot 8, blk 1
2
Lot 9, blk 1
1
Lot 10, blk 1
2
Lot 11, blkl
None - existing front yard trees to be preserved
Lot 12, blk 1
None - existing front yard trees to be preserved
Lot 1, blk 2
4
Lot 2, blk 2
3
Lot 3, blk 2
2
Lot 4, blk 2
2
Lot 5, blk 2
3
Lot 6, blk 2
1
Lot 7, blk 2
3
Lot 8, blk 2
2
Lot 9, blk 2
2
Lot 10, blk 2
7
Lot 1, blk 3
5
Lot 2, blk 3
2
Lot 3, blk 3
2
Lot 4, blk 3
3
Lot 5, blk 3
1
Lot 6, blk 3
1
Lot 7, blk 3
1
Lot 8, blk 3
2
Lot 9, blk 3
2
Lot 10, blk 3
3
Lot 11, blk 3
2
Lot, Block
Number of trees required
Lot 12, blk 3
3
Lot 13, blk 3
3
Lot 14, blk 3
3
Lot 15, blk 3
2
Lot 16, blk 3
1
Lot 17, blk 3
None — existing front yard trees to be preserved
36. The developer shall be responsible for planting any trees in side or rear yards as shown on
the landscape plan dated 3/18/05.
37. Any private street is required to have 20 -foot wide paved streets from back -of -curb to back -of -
curb, be built to a 7 -ton design, have a maximum slope of 10%, and contained within a 30 -foot
wide private easement. At the completion of the project, the developer will be required to
submit inspection/soil reports certifying that the private street was built to a 7 -ton design.
38. If importing or exporting material for development of the site is necessary, the applicant will be
required to supply the City with detailed haul routes and traffic control plans. The applicant
should be aware that any off-site grading will require an easement from the appropriate property
owner.
39. All of the ponds are required to be designed to National Urban Runoff Program (NURP)
standards with maximum 3:1 slopes and a 10:1 bench at the NWL.
40. Any retaining wall over 4 feet in height must be designed by a Structural Engineer registered in
the State of Minnesota with an approved fence. Also, it will require a building permit from the
Building Department.
41. Prior to final platting, storm sewer design data will need to be submitted for staff review.
Depending on the size of the drainage area, additional catch basins may be required at that time.
The storm sewer will have to be designed for a 10 -year, 24-hour storm event. Drainage and
utility easements will need to be dedicated on the final plat over the public storm drainage
system including ponds, drainage swales, emergency overflows, access routes for maintenance,
and wetlands up to the 100 -year flood level. The minimum easement width shall be 20 feet
wide. Emergency overflows from all stormwater ponds will also be required on the
construction plans.
42. Erosion control measures and site restoration must be developed in accordance with the City's
Best Management Practice Handbook (BMPH). Staff recommends that the City's Type II
erosion control fence, which is a heavy-duty silt fence, be used for the area adjacent to the
existing wetlands. Type I silt fence shall be used in all other areas. hi addition, tree
preservation fencing must be installed at the limits of tree removal. Erosion control blankets are
recommended for all of the steep 3:1 slopes with an elevation change of eight feet or more. All
disturbed areas, as a result of construction, must be seeded and mulched or sodded immediately
after grading to minimize erosion.
43. All of the utility improvements are required to be constructed in accordance with the City's
latest edition of Standard Specifications and Detail Plates. The applicant is also required to
enter into a development contract with the City and supply the necessary financial security in
the form of a letter of credit or cash escrow to guarantee installation of the improvements and
the conditions of final plat approval. The applicant must be aware that all public utility
improvements will require a preconstruction meeting before building permit issuance.
44. The sanitary sewer and water hookup charges will be applicable for each of the new lots. The
2005 trunk hookup charge is $1,458 for sanitary sewer and $2,955 for watermain. Sanitary
sewer and watermain hookup fees may be specially assessed against the parcel at the time of
building permit issuance. All of these charges are based on the number of SAC units assigned
by the Met Council and are due at the time of building permit issuance.
45. The applicant shall include a drain file system behind the curbs to convey sump pump discharge
from homes not adjacent to ponds.
46. All plans must be signed by a registered engineer in the State of Minnesota.
47. Maximum 3:1 side slopes are allowed without the use of a retaining wall.
48. On the preliminary plat sheet show the street right-of-way for the cul-de-sacs.
49. Minimum 20 -foot wide public drainage and utility easements will be required over the sanitary
sewer and watermain that is outside of the right-of-way.
50. On the grading plan:
a. Show the benchmark.
b. Add a note to remove all existing approaches.
c. Show the retaining walls top and bottom elevations.
d. Revise the street grades to comply with the 7% maximum requirement.
e. Eliminate Pond 1 and bring the drainage to Pond 2.
f. The proposed grading for Lots 4-6, Block 3 needs to be revised to prevent the garage
elevation of Lot 4 from being lower than the street.
g. The garage elevations of Lots 5 and 6 need to be at least 1.5 feet higher than the emergency
overflow for the street.
h. Install a culvert under the proposed street connection at Galpin Boulevard.
i. Show the 1036 contour around the housepad of Lot 2, Block 1.
j. Show the proposed storm sewer on the plan.
51. Label the existing and proposed street names on all plan sheets.
52. On the utility plan:
a. Revise the note to say "All storm pipe shall be Class 5...".
b. Show all existing utilities, pipe type and manhole rim/inverts within Lake Lucy Road,
Galpin Boulevard, Highover Trail and Manchester Drive.
c. Revise the location of the downstream sanitary sewer from MH -15 so it goes between Lots
4 and 5 versus Lots 5 and 6, Block 1.
d. Show all utility and storm ponds easements.
e. Sanitary service must be 6 -inch PVC and water service 1 -inch copper type K.
f. The watermain must be looped through to Manchester Drive versus Galpin Boulevard.
53. Staff is recommending that a raw water transmission main be extended through the site for
future connection to the City's second water treatment plant. The construction cost for the raw
watermain will be paid by the City from the water portion of the Utility Fund. The developer
will be required to provide public drainage and utility easements over the transmission main and
to install the pipe as a part of the utility construction.
54. Since the applicant is now proposing more units (39) than what the property has been assessed
for, the additional 38 units (39-1=38) will be charged a sanitary sewer and watermain lateral
connection charge. These charges are due at the time of final plat recording.
55. As with past developments that access off of Galpin Boulevard, a right -tum lane into the site
will be required to be constructed. The tum lane must meet Carver County design requirements.
56. A 10 -foot clear space must be maintained around fire hydrants, i.e. street lamps, trees, shrubs,
bushes, Xcel Energy, Qwest, Cable TV and transformer boxes. This is to ensure that hydrants
can be quickly located and safely operated by firefighters. Pursuant to Chanhassen City
Ordinance #9-1.
57. Two additional fire hydrants are required.
58. Fire apparatus access roads and water supply for fire protection is required to be installed. Such
protection shall be installed and made serviceable prior to and during the time of construction
except when approved alternate methods of protection are provided.
59. Temporary street signs shall be installed on each street intersection when construction of the
new roadway allows passage by vehicles. Pursuant to 2002 Minnesota Fire Code Section 501.4.
60. No burning permits will be issued for trees to be removed. Trees and shrubs must either be
removed from site or chipped.
61. Submit street names to Chanhassen Building Official and Chanhassen Fire Marshal for review
and approval.
62. Create a Lot 1, Block 4, on the eastern portion of Outlot A, east of wetland E.
63. The private street driveway shall be as shown on the Lot 11 & 12 detail plan dated 5/09/05."
C. "The front yard variance for Block 2 and denied the bluff setback variances based on the
findings of fact attached to the staff report."
D. "The wetland alteration permit to fill and alter wetlands on site subject to the following
conditions:
1. The wetland alteration permit is contingent on final plat approval for Lake Harrison.
2. A wetland delineation report illustrating wetland type, boundary and vegetation shall be
submitted prior to final plat approval.
3. The applicant shall submit a Wetland Conservation Act (WCA) application illustrating two
alternatives that demonstrate proposed plans were sequenced in the following order of
decreasing preference: 1) Avoidance of wetland impact, 2) Minimization of wetland impacts,
3) Rectification of wetland impacts and 4) Mitigation of wetland impacts. The applicant
shall not impact basins A, G and F until it is demonstrated that these impacts have met the
above sequencing requirements. Wetland replacement shall occur in a manner consistent with
the Minnesota Wetland Conservation Act (MR 8420). The plans shall show fixed photo
monitoring points for the replacement wetlands. A five-year wetland replacement monitoring
plan shall be submitted yearly beginning one growing season after the wetland is created.
The applicant shall provide proof of recording a Declaration of Restrictions and Covenants
for Replacement Wetland. The applicant shall secure City approval of a wetland replacement
plan prior to any wetland impacts occurring.
4. All impacts, including the filling of wetlands and conversion of wetlands into storm water
pond, shall be mitigated with the proposed project. The applicant shall demonstrate and
document how replacement will be satisfied to ensure the 2:1 replacement ratio for all
impacted wetlands.
5. A wetland buffer with a minimum width of 20 feet shall be maintained around Wetlands A,
B, C, E, F, G and H. A wetland buffer with a minimum width of 16.5 feet shall be
maintained around Wetland D and any wetland mitigation areas. Wetland buffer areas shall
be preserved, surveyed and staked in accordance with the City's wetland ordinance. The
applicant shall install wetland buffer edge signs, under the direction of City staff before
construction begins and shall pay the City $20 per sign.
6. Building setbacks of 40 feet from the wetland buffer strips shall be maintained for all
proposed building pads. Lot 3, Block 3 and Lot 11, Block 3 shall be revised to meet building
setback requirements.
Lots 11-15 Block 3 and Lot 10 Block 2 shall be revised to incorporate all of wetland B into
Outlot C.
8. Drainage and utility easements shall be provided over all existing wetlands, wetland
mitigation areas, buffer areas used as PVC and storm water ponds.
9. Erosion and sediment controls shall be installed for the planned sanitary sewer crossing for
Wetland A area. Silt fence, mulch and wetland seed shall be used for restoration. All 3:1
slopes shall be covered with category 3 erosion blanket.
10. Chanhassen type 2 heavy duty silt fence with straw/hay bale re -enforcement shall be
provided for all silt fences adjacent to wetland and creek areas. Chanhassen type 1 silt fence
shall be installed at the OHW elevation of storm water basins following permanent outlet
installation.
11. Silt fence shall be installed between wetland impact areas and the remaining wetland.
12. Construction phasing of the road shall be provided for the wetland/creek crossing. Due to
potential concentrated flows, a creek crossing plan shall be developed and outlined in the
SWPPP. A detail shall also be provided. Stabilization of the crossing area shall be provided
within 24 hours following temporary or final grade. The silt fence shall be wrapped up and
around the culvert leaving the wetted perimeter free of silt fence. Soil shall be prevented
from entering the waters of the state.
13. The applicant shall apply for and obtain permits from the appropriate regulatory agencies (e.g.,
Riley -Purgatory -Bluff Creek Watershed District, Minnesota Pollution Control Agency (NPDES
Phase II Construction Permit), Minnesota Department of Natural Resources (for dewatering))
and comply with their conditions of approval.
GAPLAN\2005 Planning Cases\05-14 Lake Hanson (Pemtom)\Final Plat\Final Plat Memo to Staff