1b-1) Final Plat Approval for Powers Place and Powers PlaceSecond AdditionCITY OF 1
MEMORANDUM
CHANHASSEN
690 COULTER DRIVE • P.O. BOX 147 • CHANHASSEN, MINNESOTA 55317
(612) 937 -1900 • FAX (612) 937 -5739
Action by City AAdministmtor
Endors
Modified
Rejecte
net Date Submitted to Commisslort
Date Submitted to Council
TO: Don Ashworth, City Manager
FROM: Sharmin Al -Jaff, Planner II
Dave Hempel, Assistant City Engineer
Diane Desotelle, Water Resources Coordinator
DATE: March 13, 1995
SUBJ: Final Plat Approval for Powers
On November 28, 1994, the City Council
Alteration Permit #94 -5, and Site Plan Re
23, 1994 subject to the following conditic
1. A "No Parking" restriction shall b
"No Parking" restrictions /signs shin
2. Amend the PUD Contract to, state
exceed 35 %. a �
3. The townhome
applicant in the
powers boule
adding dorm
and Powers Place Second Addition
reliminary Plat PUD #87 -3, Wetland
as shown on the plans dated September
lesignated `along the private streets. Appropriate
be placed on the private street.
the impervious surface coverage of the site cannot
conform to the design and
narrative. Introduce some
itecture as proposed by the
ition among buildings facing
louvers, shifting entry ways,
tk up the 14rg ,,roof span.
Powers Place and Powers Place Second Addition
Final Plat
March 13, 1995
Page 2
8. Fencing shall be placed around the stand of trees to minimize impact during
construction. Protected trees lost due to construction must be replaced on a 1.2
canopy basis in accordance with a plan approved by staff.
9. A lighting plan shall be submitted for the interior private streets.
10. A revised landscaping plan which provide additional landscaping and berming along
Powers Boulevard (County Road 17), and the westerly portion of the site.
11. Submit proposed street names to the Public Safety Department, Inspections Division
for review prior to final plat approval. The plat must be revised to include the
approved names after their review.
12. Fire Marshal conditions:
a. An additional fire hydrant shall be installed at the new "T" intersection. The
remaining fire hydrants shall be relocated with equal spacing. Fire hydrants
shall placed a maximum of 300 feet apart. Contact the Chanhassen Fire
Marshal for exact locations.
b. Submit new street names for review and approval.
C. A twenty foot wide fire lane must be maintained on the new proposed
north/south street. "No Parking Fire Lane" signs shall be installed on both
sides of the street with 75 foot spacing.
13. The applicant will need to develop a sediment and erosion control plan in accordance
with the City's Best Management Practice Handbook and the Surface Water
Management Plan requirements for new developments. The plan shall be submitted to
the City for review and formal approval.
14. All areas disturbed as a result of construction activities shall be immediately restored
with seed and disc - mulched or wood -fiber blanket or sod within two weeks of
completion of each activity in accordance with the City's Best Management Practice
Handbook.
15. All utility improvements shall be constructed in accordance with the latest edition of
the City's Standard Specifications and Detail Plates. Detailed utility plans and
specifications shall be submitted for staff review and City Council approval. The
street shall be constructed in accordance to the city's private driveway ordinance for
Powers Place and Powers Place Second Addition
Final Plat
March 13, 1995
Page 3
multifamily zoning (Ordinance #209). Issuance of permits and inspection of the utility
lines will be performed by the city's Building Department. Streets and utilities, except
the ponding areas, storm sewer outlet and pipe systems, shall be owned and
maintained by the homeowners association.
16. Wetland buffer areas shall be surveyed and staked in accordance with the City's
wetland ordinance. The City will install wetland buffer edge signs before construction
begins and will charge the applicant $20 per sign.
17. The applicant shall provide detailed storm sewer calculations for 10 -year and 100 -year
storm events and provide ponding calculations for stormwater quality /quantity ponds in
accordance with the City's Surface Water Management Plan for the City Engineer to
review and approve. The applicant shall provide detailed predeveloped and post
developed stormwater calculations for 100 -year storm events and normal water level
and high water level calculations in existing basins and individual storm sewer
calculations between each catch basin segment will also be required to determine if
sufficient catch basins are being utilized.
18. The applicant shall enter into a site development contract with the City and provide
the necessary financial security to guarantee compliance with the terms of the
development contract.
19. Applicant will meet wetland rules and regulations as stated in Corps of Engineers
section 404 permit, the state Wetland Conservation Act, and the City's Wetland
Ordinance. Mitigation work shall be implemented prior to or concurrent with wetland
fill activity in all phases of the project.
20. The applicant shall apply for and obtain permits from the appropriate regulatory
agencies, i.e. Carver County Highway Department, Watershed District, Metropolitan
Waste Control Commission, Health Department, Minnesota Pollution Control Agency,
Minnesota Department of Natural Resources, Army Corps of Engineers and Minnesota
Department of Transportation and comply with their conditions of approval.
21. The applicant shall include a drain tile system behind the curbs to convey sump pump
' discharge from the units.
22. The appropriate drainage and utility easements should be dedicated on the final plat
' for all utilities and ponding areas lying outside the right -of -way. The easement width
shall be a minimum of 20 feet wide. Consideration should also be given for access
for maintenance of the ponding areas.
Powers Place and Powers Place Second Addition
Final Plat
March 13, 1995
Page 4
23. No berming or landscaping will be allowed within the right -of -way or utility and
drainage easements without approval by the city. The applicant shall enter into an
encroachment agreement.
24. The lowest floor elevation of all buildings adjacent to storm water ponds or wetlands
shall be a minimum of 3 feet above the 100 -year high water level.
25. The proposed stormwater ponds must have side slopes of 10:1 for the first ten feet at
the normal water level and no more than 3:1 thereafter or 4:1 throughout for safety
purposes. The pond(s) shall be sized in accordance to the city's Surface Water
Management Plan.
26. Water quality fees will be based in accordance with the City's SWMP. The
requirement for cash in lieu of land and pond construction shall be based upon a
schedule in accordance with the prescribed land use zoning.
27. Water quantity fees will be based in accordance with the City's SWMP. Storm sewer
trunk fees will be evaluated based on the applicant's contribution to the SWMP design
requirements.
28. The applicant shall report to the City Engineer the location of any drain tiles found
during construction and shall re- locate or abandon the drain tile as directed by the City
Engineer.
29. Prior to final platting, the applicant, county and city shall meet to discuss /resolve the
specifics on pond design and access to the site.
30. No decks or any portion of the dwellings may encroach into the City's drainage and
utility easements.
31. The curves in the private street lying south of the access shall be "softened" to
accommodate public safety vehicle turning movements.
32. The plat should be redesigned to remove those lot lines which encroach upon the 25
foot building setback line
33. The applicant shall evaluate the potential for impacts to adjacent building foundations
during the grading process.
Powers Place and Powers Place Second Addition
Final Plat
' March 13, 1995
Page 5
' 34. Retaining walls shall be engineered to incorporate subsurface drainage and surface
water runoff.
' 35. The applicant shall provide a safety fence or other landscaping provision to help
prevent children from falling over the retaining walls. These safety provisions or
' fencing shall be discussed and approved by city staff considering the discussion held
at the Planning Commission meeting. Vegetation shall be added along the western
edge of the retaining walls to provide additional buffering.
' 36. The applicant shall relocate Unit 20 to save the 24 and 30 inch oak trees. 2 of the 4
oak trees shall be saved in the vicinity of Unit 21, at a minimum, by relocating the
placement of the unit. If it is not possible to save at least 2 of the 4 oak trees in that
vicinity, the unit shall be omitted from the development.
The City Council also approved the preliminary plat PUD #87 -3 as shown on the plans dated
September 23, 1994, and subject to the following conditions:
1. Compliance with conditions of PUD and site plan.
' FINAL PLAT REQUEST
The applicant is requesting final plat approval for Powers Place and Powers Place Second
' Addition. The site is being final platted in two additions. This does not impact the plat in
any way. This first addition includes 24 lots and two outlots. The second addition includes
the remaining 24 lots resulting in a total of 48 twin homes located within 24 structures. The
' plat includes the construction of a private street to serve the development. A wetland
occupies the northern portion of the site. All structures maintain wetland setback
requirements. Setbacks from the wetland shall be 50 feet with a 10 foot minimum buffer
' strip. A mature stand of trees occupy the southerly portion of the site. These trees will be
protected by retaining walls to minimize impact of construction on them. During
construction, fencing will be placed around the trees.
' Storm Water Quality Fees
The water quality charge has been calculated at $1530 per acre for a multi - family (townhome)
residential development. This proposed development of 9.3 acres would then be responsible
for a water quality connection charge of $14,229. This includes a land cost estimate of
' $24,000 per acre and excavation fees. Credit may be given to the applicant for the
construction of the permanent sediment basin and the land. This credit will be determined
after staff receives and reviews final stormwater drainage calculations.
Powers Place and Powers Place Second Addition
Final Plat
March 13, 1995
Page 6
Storm Water Quantity Fees
Medium density developments will have a connection charge of $2,975 per developable acre.
The proposed medium density development of 9.3 acres would then be responsible for a water
quantity connection charge of $27,668. The applicant is required to hold the 100 -year storm
on -site and discharge the runoff at predeveloped runoff rates under Powers Boulevard. Staff
will review and calculate the credit, if any, after receiving the final storm drainage
calculations.
DRAINAGE
The sediment basin adjacent to the wetland on the northern end of the parcel should be
sufficient to retain 35% to 55% of the phosphorus loading before it enters the wetland. The
existing 24" storm sewer underneath Powers Boulevard has been extended and upgraded in
conjunction with Joe Miller's Lake Susan Hills West 9th Addition. In addition, Joe Miller's
development constructed water quality basins to pretreat the runoff from this development and
others prior to discharging into the wetlands downstream. Appropriate ponding will be
necessary to maintain the desired level of flood protection for the area.
The drainage plan for this development has been designed in conjunction with the upgrade of
Powers Boulevard. Since the County road project has been delayed, interim measures such as
sediment basins and maintaining a portion of the current ditch section have been incorporated
to accommodate surface drainage from the site. The plans propose conveying storm runoff
through a series of storm sewer pipes into a sediment basin prior to discharging into a
wetland area on the north end of the project. The wetland will overflow into the storm sewer
system into the existing 24 -inch storm sewer underneath Powers Boulevard. At the time of
writing of this report City staff has not had time to review the final storm drainage
calculations. Staff is confident that no major revisions will be necessary. Only minor
revisions such as an additional catch basin or two are anticipated.
GRADING
Based on the construction drawings, both phases of the development will be graded initially
in an effort to balance earthwork. The applicant is proposing to use retaining walls to
minimize grading, tree loss and confine construction limits to within the property. The
applicant has tiered the retaining walls to reduce the overall height. The retaining walls range
from 2 to M feet in height. A fence and landscaping are proposed on the hillside above the
retaining walls for safety purposes. With grading into the side of the hill, subsurface drainage
most likely will be encountered. The applicant's retaining wall design does not provide
Powers Place and Powers Place Second Addition
Final Plat
March 13, 1995
Page 7
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C
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means of accommodating the subsurface drainage. The applicant's engineer should take into
account drain tiles along the perimeter of the retaining walls to address the situation.
The overall site grading was to be coordinated with the upgrade of Powers Boulevard;
however, due to delays with the project this site will be graded independently of Powers
Boulevard construction. The ditch section along Powers Boulevard will temporarily remain in
place until the Powers Boulevard project commences. As a result of this timing difference,
not all of the proposed landscaping adjacent to Powers Boulevard will be able to be installed
with Phase I. The County's project will encroach into the site to match the proposed grades.
It has been agreed upon between the developer and City and County that upon completion of
the County's grading the developer shall install the remaining landscaping. Staff has included
security in the site plan agreement to insure that the landscaping will be installed in the
future.
EROSION CONTROL
An erosion control plan has been incorporated into the grading and drainage plan. Staff
recommends the applicant also install Type I erosion control fence adjacent to Powers
Boulevard since the timing of these two projects differ. All disturbed areas as a result of
construction shall be seeded and mulched or sodded within two weeks after completion.
STREETS
Access to the site is through one access point approximately in the middle of the site. This
will serve both phases of the development. Auxiliary turn lanes will be provided with the
upgrade of Powers Boulevard including a full median access. Additional right -of -way is not
needed for the widening of Powers Boulevard. The applicant's engineer has been working
with City staff and the County's Project Engineer to coordinate installation of the
infrastructures and site grading with the future upgrade of Powers Boulevard. The private
internal street to service this development is designed in accordance to the City's private
street ordinance. No parking signs are proposed in accordance to the City Fire Marshal's
recommendations. Upon completion of the project staff recommends the applicant supply the
City with as -built drawings of the utility and street improvements.
MISCELLANEOUS
The landscape plan provided by the applicant shows numerous plantings and berms within the
City's drainage and utility easement adjacent to Powers Boulevard. The City has reviewed
the plans in relation with the existing utility lines and finds them acceptable; however, the
applicant will be required to enter into an encroachment agreement whereby the City would
Powers Place and Powers Place Second Addition
Final Plat
March 13, 1995
Page 8
not be responsible for replacing any landscaping materials that may be lost due to the result
of maintenance of the City's infrastructures. The landscape plan will also need to be signed
by a professional landscape architect. The home sites adjacent to Powers Boulevard are
approximately 10 feet from the City's utility lines. Permanent structures such as decks or
additions shall be prohibited from encroaching upon the City's easement.
EASEMENTS
The final plats for both phases shall provide the appropriate 10 -foot wide drainage and utility
easement along the perimeter of the plat.
CONDITIONS OF PRELIMINARY PLAT APPROVAL
Preliminary plat PUD #87 -3 Wetland Alteration Permit #94 -5, and Site Plan Review #94 -7 as
shown on the plans dated September 23, 1994 are subject to the following conditions:
1. A "No Parking" restriction shall be designated along the private streets. Appropriate
"No Parking" restrictions /signs shall be placed on the private street.
This condition is a duplication of condition #12c. Consequently it will be deleted.
2. Amend the PUD Contract to state the impervious surface coverage of the site cannot
exceed 35 %.
This condition will be met as part of this application approval.
3. The townhome units shall conform to the design and architecture as proposed by the
applicant in their attached narrative. Introduce some variation among buildings facing
powers boulevard, through the shape of windows, adding louvers, shifting entry ways,
adding dormers, or color. Introduce new elements to break up the large roof span.
This condition is still applicable. Staff will work with the applicant to ensure
variation among buildings is achieved.
4. The applicant should submit a street lighting plan for the interior streets for staff
review and approval.
This condition is a duplication of condition #9. Consequently condition #9 will be
deleted.
' Powers Place and Powers Place Second Addition
Final Plat
' March 13, 1995
Page 9
' 5. A cross - access easement shall be conveyed to all the lots for use of the private street.
' This condition has been addressed in the private covenants for this development.
The City Attorney has reviewed the document. It provides a cross - access
easement to all lots to use the private street.
6. Park and trail dedication fees shall be paid in lieu of park land dedication.
' This condition is still applicable.
7. Plans shall provide one visitor parking space per 6 units.
' The plans reflect the required number of parking spaces.
' 8. Fencing shall be placed around the stand of trees to minimize impact during
construction. Protected trees lost due to construction must be replaced on a 1.2
canopy basis in accordance with a plan approved by staff.
' This condition is still applicable. Staff would recommend modifying the condition
pp Y g
' further and requiring a tree preservation easement to ensure protection of these
trees.
9. A lighting plan shall be submitted for the interior private streets.
This condition is a duplication of condition #4 and will be deleted.
' 10. A revised landscaping plan which provide additional landscaping and ben along
Powers Boulevard (County Road 17), and the westerly portion of the site.
' The applicant has submitted a revised landscaping plan. Additional landscaping
has been provided. Isanti Dogwood will be planted west of all proposed retaining
' walls and fences. The stretch along Powers Boulevard is adequately landscaped
and is in keeping with the landscape ordinance requirements. Financial
guarantees will be required to ensure installation of the required landscaping.
' 11. Submit proposed street names to the Public Safety Department, Inspections Division
for review prior to final plat approval. The plat must be revised to include the
' approved names after their review.
Powers Place and Powers Place Second Addition
Final Plat
March 13, 1995
Page 10
This condition is still applicable, however, needs to be modified since the streets
will be private, the street names cannot be listed on the plats. The Public Safety
Department shall review and approve the private street names prior to issuing
any building permits.
12. Fire Marshal conditions:
a. An additional fire hydrant shall be installed at the new "T" intersection. The
remaining fire hydrants shall be relocated with equal spacing. Fire hydrants
shall placed a maximum of 300 feet apart. Contact the Chanhassen Fire
Marshal for exact locations.
This condition has been met.
b. Submit new street names for review and approval.
This condition is a duplication of condition #11. Consequently, it will be
deleted.
C. A twenty foot wide fire lane must be maintained on the new proposed
north/south street. "No Parking Fire Lane" signs shall be installed on both
sides of the street with 75 foot spacing.
This condition is still applicable.
13. The applicant will need to develop a sediment and erosion control plan in accordance
with the City's Best Management Practice Handbook and the Surface Water
Management Plan requirements for new developments. The plan shall be submitted to
the City for review and formal approval.
This condition has been met.
14. All areas disturbed as a result of construction activities shall be immediately restored
with seed and disc - mulched or wood -fiber blanket or sod within two weeks of
completion of each activity in accordance with the City's Best Management Practice
Handbook.
This condition is still applicable.
i Powers Place and Powers Place Second Addition
Final Plat
' March 13, 1995
Page 11
15. All utility improvements shall be constructed in accordance with the latest edition of
the City's Standard Specifications and Detail Plates. Detailed utility plans and
' specifications shall be submitted for staff review and City Council approval. The
street shall be constructed in accordance to the city's private driveway ordinance for
multifamily zoning (Ordinance #209). Issuance of permits and inspection of the utility
' lines will be performed by the city's Building Department. Streets and utilities, except
the ponding areas, storm sewer outlet and pipe systems, shall be owned and
maintained by the homeowners association.
This condition has been partially met. The condition will be amended to read
"Issuance of permits and inspection of the utility lines will be performed by the
' City's Building Department. Streets and utilities, except the ponding areas, storm
sewer outlet and pipe systems, shall be owned and maintained by the homeowners
association."
16. Wetland buffer areas shall be surveyed and staked in accordance with the City's
wetland ordinance. The City will install wetland buffer edge signs after construction
of the wetland mitigation areas and will charge the applicant $20 per sign.
This condition is still applicable.
17. The applicant shall provide detailed storm sewer calculations for 10 -year and 100 -year
storm events and provide ponding calculations for stormwater quality /quantity ponds in
accordance with the City's Surface Water Management Plan for the City Engineer to
review and approve. The applicant shall provide detailed predeveloped and post
developed stormwater calculations for 100 -year storm events and normal water level
and high water level calculations in existing basins and individual storm sewer
calculations between each catch basin segment will also be required to determine if
sufficient catch basins are being utilized.
This condition is still applicable. Staff received the information late and did not
' have time to review the documents to credit the applicant's SWMP fees.
18. The applicant shall enter into a site plan agreement with the City and provide the
necessary financial security to guarantee compliance with the terms of the agreement.
This condition needs to be modified. Most of the site improvements are private
with the exception of some storm sewers and ponding. Therefore, the applicant
will need to enter into a PUD /development contract.
u
Powers Place and Powers Place Second Addition
Final Plat
March 13, 1995
Page 12
19. Applicant will meet wetland rules and regulations as stated in Corps of Engineers
section 404 permit, the state Wetland Conservation Act, and the City's Wetland
Ordinance. Mitigation work shall be implemented prior to or concurrent with wetland
fill activity in all phases of the project.
This condition is still applicable.
20. The applicant shall apply for and obtain permits from the appropriate regulatory
agencies, i.e. Carver County Highway Department, Watershed District, Metropolitan
Waste Control Commission, Health Department, Minnesota Pollution Control Agency,
Minnesota Department of Natural Resources, Army Corps of Engineers and Minnesota
Department of Transportation and comply with their conditions of approval.
This condition should be modified. The applicant has received watershed district
and health department approval.
21. The applicant shall include a drain tile system behind the curbs to convey sump pump
discharge from the units.
This condition is no longer applicable. The development has a storm sewer
system to accommodate runoff from the dwellings.
22. The appropriate drainage and utility easements should be dedicated on the final plat
for all utilities and ponding areas lying outside the right -of -way. The easement width
shall be a minimum of 20 feet wide. Consideration should also be given for access
for maintenance of the ponding areas.
This condition has been partially met. Staff will modify the condition to read,
"The final plats shall dedicate a 10 foot wide drainage and utility easement
around the perimeter of both plats.
23. No berming or landscaping will be allowed within the right -of -way or utility and
drainage easements without approval by the city. The applicant shall enter into an
encroachment agreement.
This condition needs to be modified. Staff has reviewed the landscape plan and
finds the plant locations acceptable in relation to the existing utilities. The
applicant will still need to enter into an encroachment agreement with the city.
' Powers Place and Powers Place Second Addition
Final Plat
March 13, 1995
Page 13
' 24. The lowest floor elevation of all buildings adjacent to storm water ponds or wetlands
shall be a minimum of 3 feet above the 100 -year high water level.
I This condition is still applicable.
' 25. The proposed stormwater ponds must have side slopes of 10:1 for the first ten feet at
the normal water level and no more than 3:1 thereafter or 4:1 throughout for safety
purposes. The pond(s) shall be sized in accordance to the city's Surface Water
' Management Plan.
This condition has been met.
26. Water quality fees will be based in accordance with the City's SWMP. The
requirement for cash in lieu of land and pond construction shall be based upon a
schedule in accordance with the prescribed land use zoning.
This condition has been modified and will be combined with condition #27.
' 27. Water uantit fees will be based in accordance with the City's SWMP. Storm sewer
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' trunk fees will be evaluated based on the applicant's contribution to the SWMP
design.
This condition has been modified to read "Storm water quantity and quality
connection fees have been based in accordance with the City's SWMP. Storm
water connection fees have been evaluated based on the applicant's contribution
to the SWMP design requirements. Staff has calculated the fees at $27,668 and
$14,229 respectively. Credit may be given and will be determined when the final
stormwater drainage calculations are submitted. These fees are payable at time
the final plat is recorded ".
28. The applicant shall report to the City Engineer the location of any drain tiles found
' during construction and shall re- locate or abandon the drain tile as directed by the City
Engineer.
This condition is still applicable.
29. Prior to final platting, the applicant, county and city shall meet to discuss /resolve the
' specifics on pond design and access to the site.
This condition has been met.
1
Powers Place and Powers Place Second Addition
Final Plat
March 13, 1995
Page 14
30. No decks or any portion of the dwellings may encroach into the City's drainage and
utility easements.
This condition is still applicable.
31. The curves in the private street lying south of the access shall be "softened" to
accommodate public safety vehicle turning movements.
This condition has been met. A guard rail has also been added on the south end
of the curve.
32. The plat should be redesigned to remove those lot lines which encroach upon the 25
foot building setback line
This condition needs to be modified. No structure shall encroach upon the 25
foot setback area including but not limited to decks and porches.
33. The applicant shall evaluate the potential for impacts to adjacent building foundations
during the grading process.
This condition has been met (see Attachment #1).
34. Retaining walls shall be engineered to incorporate subsurface drainage and surface
water runoff.
This condition has been partially met. The applicant's engineer for the retaining
walls still needs to address subsurface drainage.
35. The applicant shall provide a safety fence or other landscaping provision to help
prevent children from falling over the retaining walls. These safety provisions or
fencing shall be discussed and approved by city staff considering the discussion held
at the Planning Commission meeting. Vegetation shall be added along the western
edge of the retaining walls to provide additional buffering.
This condition has been met.
36. The applicant shall relocate Unit 20 to save the 24 and 30 inch oak trees. 2 of the 4
oak trees shall be saved in the vicinity of Unit 21, at a minimum, by relocating the
placement of the unit. If it is not possible to save at least 2 of the 4 oak trees in that
vicinity, the unit shall be omitted from the development.
' Powers Place and Powers Place Second Addition
Final Plat
March 13, 1995
Page 15
' This condition has been met.
RECOMMENDATION
Staff recommends the City Council approve the Final Plat PUD #87 -3 for Powers Place and
' Powers Place Second Addition as shown on the plans dated March 8, 1995 and subject to the
following conditions:
I 1. Amend the PUD contract to state the impervious surface coverage of the site cannot
exceed 35 %.
' 2. The townhome units shall conform to the design and architecture as proposed by the
applicant in their attached narrative. Introduce some variation among buildings facing
powers boulevard, through the shape of windows, adding louvers, shifting entry ways,
' adding dormers, or color. Introduce new elements to break up the large roof span.
3. The applicant shall submit a street lighting plan for staff review and approval prior to
' recording of the final plats.
4. Park and trail dedication fees shall be paid in lieu of park land dedication.
5. Tree rotection fencing shall be laced around the stand of trees to minimize impact
P g P P
' during construction. Protected trees lost due to construction must be replaced on a 1.2
canopy basis in accordance with a plan approved by staff. Tree preservation
easements shall be dedicated over the stand of trees on the site prior to recording of
' the final plats.
6. Submit proposed street names to the Public Safety Department, Inspections Division
' for review and approval prior to issuance of any building permits.
7. A twenty foot wide fire lane must be maintained on the new proposed north/south
' street. "No Parking Fire Lane" signs shall be installed on both sides of the street with
75 foot spacing.
' 8. All areas disturbed as a result of construction activities shall be immediately restored
with seed and disc - mulched or wood -fiber blanket or sod within two weeks of
completion of each activity in accordance with the City's Best Management Practice
Handbook.
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r
Powers Place and Powers Place Second Addition
Final Plat
March 13, 1995
Page 16
9. Issuance of permits and inspection of the utility lines will be performed by the city's
Building Department. Streets and utilities, except the ponding areas, storm sewer
outlet and pipe systems, shall be owned and maintained by the homeowners
association
10. Wetland buffer areas shall be surveyed and staked in accordance with the City's
wetland ordinance. The City will install wetland buffer edge signs before construction
begins and will charge the applicant $20 per sign.
11. The applicant shall provide detailed storm sewer calculations for 10 -year and 100 -year
storm events and provide ponding calculations for stormwater quality /quantity ponds in
accordance with the City's Surface Water Management Plan for the City Engineer to
review and approve. The applicant shall provide detailed predeveloped and post
developed stormwater calculations for 100 -year storm events and normal water level
and high water level calculations in existing basins and individual storm sewer
calculations between each catch basin segment will also be required to determine if
sufficient catch basins are being utilized.
12. The applicant shall enter into a PUD /development agreement with the City and
provide the necessary financial security to guarantee compliance with the terms of the
agreement.
13. Applicant will meet wetland rules and regulations as stated in Corps of Engineers
section 404 permit, the state Wetland Conservation Act, and the City's Wetland
Ordinance. Mitigation work shall be implemented prior to or concurrent with wetland
fill activity in all phases of the project.
14. The applicant shall apply for and obtain permits from the appropriate regulatory
agencies, i.e. Carver County Highway Department, Metropolitan Waste Control
Commission, Minnesota Pollution Control Agency, Minnesota Department of Natural
Resources, and Army Corps of Engineers and comply with their conditions of
approval.
15. The final plats shall dedicate a 10 foot wide drainage and utility easement around the
perimeter of both plats. I
16. The applicant shall report to the City Engineer the location of any drain tiles found
during construction and shall re- locate or abandon the drain tile as directed by the City I
Engineer.
C
' Powers Place and Powers Place Second Addition
Final Plat
' March 13, 1995
Page 17
17. No decks or any portion of the dwellings may encroach into the City's drainage and
utility easements.
18. No structure shall encroach upon the 25 foot building setback line including but not
limited to decks and porches.
' 19. Compliance with conditions of PUD and site plan.
' 20. The applicant's engineer shall accommodate subsurface drainage in the design of the
retaining walls.
' 21. Upon completion of the County grading of Powers Boulevard, the developer shall
install the remaining landscaping improvements along Powers Boulevard. A security
escrow shall be held until the landscaping materials have been installed in accordance
t with the approved plan.
22. Type I erosion control fence shall be added to the grading/erosion control plan
adjacent to Powers Boulevard.
23. Upon completion of the site improvements, the applicant shall supply the City with as-
built construction drawings of the utility and street improvements.
24. The applicant and /or homeowners association will be required to enter into an
encroachment agreement with the city for installation of landscaping materials that
encroach upon the City's drainage and utility easement along Powers Boulevard
(County Road 17). Permanent structures such as decks or additions shall be prohibited
from encroaching upon the City's easement areas.
' 25. The landscape plan shall be revised to denote the types of planting material shown on
the plan. In addition, the final plan shall be signed by a professional landscape
architect registered in the State of Minnesota.
26. In lieu of an acceptable turnaround at the south end of the private street, Lots 1 and 2,
Block 1, Lots 1 and 2, Block 2, Lots 1 and 2, Block 3 and Lots 1 and 2, Block 4,
Powers Place Second Addition, the dwellings shall be constructed with a residential
sprinkler system acceptable to the city's Fire Marshal.
27. The lowest floor elevation of all buildings adjacent to storm water ponds or wetlands
shall be a minimum of 3 feet above the 100 -year high water level."
r
Powers Place and Powers Place Second Addition
Final Plat
March 13, 1995 '
Page 18
ATTACHMENTS I
1. Letter from Allied Test Drilling Co. dated March 17, 1995. '
2. Final plat for Powers Place and Powers Place Second Addition dated March 8, 1995
and landscaping plan dated February 6, 1995.
03/22/95 08:49 FAX 612 442 4934 JASPER HOMES 0 002/006
ALLIED TEST DRILLING COMPANY
A D 4000 BEAU URUE DRIVE
' EAGAN, MN 55122
Exploration - Evaluation - Foundation Engineering
' (612)452.6913
' March 17, 1995
Jasper Development Corporation of Waconia
' 219 East Frontage Road
Waconia, Minnesota 55387
' Attn: Mr. James Jasper
Subj: Powers Place Twinhome Development
' Chanhassen, Minnesota
Allied Project No. 94083
' Dear Mr. Jasper:
The purpose of this letter is to respond to your fax transmittal of February 17th, 1995
' requesting an evaluation of the potential impact of site grading on the existing homes adjacent
to the site and to provide additional recommendations to supplement our report of subsurface
soil exploration dated July 25th, 1994. It is our understanding that it is planned to design and
construct retaining walls at a number of locations to the rear of the planned twin homes.
Mr. Benton G. Ford of Rehder and Associates, your engineer for the project, has
performed measurements of the vertical and horizontal distances between the existing
foundations and the proposed retaining wall foundations and conveyed this information to me
in the form of a drawing, a copy of which is enclosed with this letter. This information
shows that the existing residential foundations reside at elevations ranging from 948 to 962 at
horizontal distances ranging from 54 to 121 feet from the planned retaining walls which will
' be founded at elevations ranging from 924 to 948 feet.
A review of the measurements indicates that conventional excavation methods should
' be able to be used for the construction of the planned walls and that sheet piling or shoring
will not be required. It will be important to monitor the soil conditions exposed in the
retaining wall excavations and to provide for adequate drainage in the backfill zone behind
the walls in order to avoid hydrostatic loads associated with saturated conditions.
Establishment of surface vegetation should also aid in reducing the potential for erosion
related problems during the construction of the retaining walls.
The backfill material will exert lateral loadings on the walls, however the vertical and
horizontal distance information indicates that it will not be necessary to consider loads
' associated with the existing residences in the design of the retaining wall structures. In order
to minimize the loading on the planned walls, we recommend the use of a free draining
granular backfill. Drainage fill material conforming with the requirements of Mn /DOT
3149.2(J) for fine filter aggregate would be suitable for this purpose. Alternatively, clean
An�G��t
03/22/95 08:50 FAX 612 442 4934
POWERS PLACE TWINHOMES
CHANHASSEN, MINNESOTA
MARCH 17th, 1995
ALLIED No. 94083
JASPER HOMES
2 003/006 '
sand fill with less than 10% passing the number 200 sieve and the additional requirement of
less than 50% passing the number 40 sieve should be adequate for use in the reinforced
concrete retaining wall backfill zone.
The free draining sand should be placed in the zone from the outside of the footing up
and outward at an angle of at least 30 degrees from the vertical. Provisions for adequate
drainage, such as a fabric wrapped and /or gravel encapsulated drain tile, would minimize the
potential for the development of a hydrostatic loading condition in the retaining wall backftll
zone. We would estimate that the free draining sands would exert an active lateral pressure
of approximately 35 pcf on the wall. It will be important to ensure that drain tiles are
protected from blockage, (due to migration of fines), prior to backfilling.
I hope that this letter provides the information required at this time. If you have any
questions please feel free to contact me at 452 -6913.
ALLIED TEST DRILLING COMPANY
t0- L�
Mike Roach, P.E.
Soils Engineer
PC: Rehder and Associates Inc.
3440 Federal Drive, Suite 240
Eagan, Minnesota 55122
Attn: Mr. Benton G. Ford, P.E.
03/22/95 08:51 FAX 612 442 4934
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