HomeMy WebLinkAbout4.c. Emerald Isle Final Plat
EXECUTIVE SUMMARY
Planning Commission Regular Meeting: August 25, 2020
Tentative City Council Meeting: September 15, 2020
AGENDA ITEM: 20-40-FP Request by CNC Development
IV, LLC for Final Plat Approval of
Emerald Isle 1st Addition
AGENDA SECTION:
Consent
PREPARED BY: Anthony Nemcek, Planner AGENDA NO. 4.c.
ATTACHMENTS: Location Map; Final Plat; Preliminary Plat
Area; Landscape Plan; Parks and
Recreation Memo dated February 18,
2020; Engineer Review Memo dated
August 25, 2020
APPROVED BY: KL
RECOMMENDED ACTION: Motion to recommend that the City Council approve the Final
Plat for Emerald Isle subject to the following conditions:
1. Execution of a Subdivision Agreement.
2. Drainage and utility easements with storm sewer infrastructure may contain fences
but shall be required to include gates to provide truck access; shall prohibit sheds or
other accessory structures; and shall prohibit landscaping that would impede
drainage.
3. The final plat shall include all easements as requested by City.
4. Provision of $25,740 for landscaping surety.
5. Payment of $136,000 for Fee-In-Lieu of Park Dedication.
6. Compliance with the conditions and standards within the City Engineer’s
Memorandum dated August 25, 2020.
7. The applicant shall receive approval from the Metropolitan Council for any
connection to the Met Council sanitary interceptor line.
SUMMARY
The Planning Commission is being asked to consider a request from CNC Development IV, LLC, for
approval of a Final Plat for Emerald Isle 1st Addition to allow development of 40 single family lots. This
plat represents the first project phase of a multi-phase preliminary plat approved by the City in May, 2020.
The final plat is necessary to facilitate subdivision of the subject property into individual residential lots,
outlots, and public streets. Staff finds the application consistent with the Emerald Isle Preliminary Plat and
recommends approval of this application subject to the conditions detailed in the attachments and the
motion above.
Applicant: CNC Development IV, LLC.
Plat Acres: 70.07
Met Council Net Acres: 70.07
Residential Lots Created: 40 lots
Gross Density: .57 Units/Acre (single family 40/70.07 acres)
Net Density: .57 Units/Acre
Comprehensive Plan Guiding: LDR-Low Density Residential,
2
Current Zoning: R1 PUD-Low Density Residential Planned Unit Development
Surrounding Land Uses
North: Low Density Residential
East: Agriculture
South: Public/Institutional
West: Medium Density Residential
BACKGROUND
In May 2020, the City Council approved a preliminary plat, Planned Unit Development (PUD) master
development plan with rezoning, and reguiding of a portion of the site to permit construction of 151
single family lots with a multi-family project to be approved in the future along the southern border. The
current final plat is the first final plat of the project, starting north to south due to necessary infrastructure.
The comprehensive plan amendment approval process through the Metropolitan Council was recently
initiated as staff was waiting for final confirmation the project was moving forward. The Amendment is
related to properties south of the current final plat area as this section of the site was already designated
for low density residential development.
ISSUE ANALYSIS
Legal Authority . This application is a Quasi-Judicial action. The final plat application is Quasi-Judicial
because the City has a set of standards and requirements for reviewing this type of application that is
described in detail below. Generally, if the final plat meets the ordinance requirements and is consistent
with the preliminary plat, it must be approved.
Land Use and Zoning . The proposed 40-lot single family final plat is consistent with the current land
use and zoning classifications. The subject property is guided LDR – Low Density Residential and zoned
R-1PUD, Low Density Residential Planned Unit Development. As a result, the property is subject to all
the standards of the R-1, Low Density Residential zoning districts as well as the standards for detached
single family units contained in the approved PUD. While this development is subject to all of the
conditions and development standards contained in the PUD, the most notable deviations from the
requirements of the Low Density Residential zoning districts are provided below. All these items were
anticipated in the preliminary plat approval and were part of the initial PUD approval.
1. Section 11-4-5 F. 1. R-1 Minimum Lot Area: The minimum lot area shall be 8,125 square feet
for interior lots and corner lot minimum of 10,625 square feet.
2. Section 11-4-5 F. 2. R-1 Minimum Lot Width: The minimum lot width shall be 65 feet for
interior lots and 85 for corner lots.
3. Section 11-4-5 F. 5. R-1 Minimum Side Yard Setback: The minimum side yard setback shall be
7.5 feet.
4. Section 11-4-5 F. 6. R-1 Minimum Rear Yard Setback: The minimum rear yard setback shall be
25 feet.
5. Section 11-4-5 F. 9. R-1 Maximum Lot Coverage: The maximum lot coverage shall be 30% for
lots over 10,000 sf and 40% for lots under 10,000.
Final Plat. Standards for reviewing subdivision requests are detailed in Title 12 of the Rosemount City
3
Code. This section of the Code outlines the two-step Preliminary and Final Plat process for land
subdivision. In this case, the preliminary plat was approved in May 2020 consisting of 151 single family
lots and various outlots.
Streets & Access.
The site will gain access form the extension of Addison Avenue into the site. Connemara Avenue will also
come from the west, in the southern portion of the property.
Water and Sanitary Sewer. Sanitary sewer is available to the site via the existing Metropolitan Council
interceptor which currently traverses the site. A permit from the Metropolitan Council is required to access
directly into the line. The elevation of the sewer must be deep enough to also serve the property to the
east, should it develop in the future. Water service will be extended from the adjoining developed property.
Development fees as detailed in the Engineer’s Memo dated July 28, 2020, are due with the final plat and
subdivision agreement.
Landscaping The landscaping plan previously provided shows one tree on the front yard of each interior
lot and two trees on each corner lot as required by the City Code. Additional landscaping is shown in the
area near the stormwater pond in the northwest portion of the plat area. The applicant is required to
submit a letter of credit of $25,740 to ensure individual lot landscaping as well as the landscaping located
in the common areas.
Storm Water Management. The developer will be managing the stormwater on site with the use of
retention and infiltration basins. There were issues previously identified with the submitted plans and final
plans will be required prior to issuance of a grading permit. Since approval of the preliminary plat, the City
and Dakota County have been talking to the applicant about expansion of the southern pond to permit
regional ponding associated with the Akron Avenue signalization improvement project. The developer will
receive credit for the additional regional ponding. A drainage and utility easement over the entirety of
Outlot B will permit installation of the pond although that area is not final platted.
Parks and Open Space. The Rosemount Parks and Recreation Department reviewed the plans for
Emerald Isle and is recommending cash in-lieu of land to meet the park dedication requirement for the
proposed development. The requirement for 40 single family units is $136,000 (40 x $3,400). The Parks
and Recreation department is also recommended a trial along County Road 42 with the trail access
provided with development of the southern apartments. Coordination should occur with connections to
the Vermillion Highlands Greenway as well as the trail crossing just west of the development area within
the old City Hall site.
Sidewalks
Sidewalks are provided throughout the development on at least one side of all streets, which is consistent
with City policy. A sidewalk is shown on the north side of Connemara Trail and a bituminous trail will be
constructed along the south side. This is consistent with the pedestrian facilities elsewhere along
Connemara in this vicinity. Sidewalk connections are provided to the adjacent neighborhoods. One
condition contained within the engineer’s memo and called out in the staff recommendation is that the
sidewalk along the northern side of Addison Avenue (Street A) be continued to at least the intersection
with Street C.
CONCLUSION & RECOMMENDATION
Staff recommends approval of the Final Plat for Emerald Isle creating 40 single family lots. This
recommendation is based on the information submitted by the applicant, findings made in this report, and
the conditions detailed in the attached memorandums.
BEARINGS ARE BASED ON THE EAST LINE OF THE E 1/2
OF THE NE 1/4 OF SEC. 27, T. 115, R. 19 WHICH IS
ASSUMED TO HAVE A BEARING OF N 00°24'42" E
NOTE: NO MONUMENT SYMBOL SHOWN AT ANY STATUTE
REQUIRED LOCATION INDICATES A PLAT MONUMENT THAT WILL
BE SET WITHIN ONE YEAR FROM THE RECORDING DATE OF THIS
PLAT. SAID MONUMENTS SHALL BE 1/2 INCH x 14 INCH
IRON PIPES MARKED BY R.L.S. NO. 47481.
DENOTES FOUND 1/2 INCH IRON MONUMENT WITH
CAP MARKED R.L.S. NO. 47481
DENOTES DAKOTA COUNTY CAST IRON MONUMENT
KNOW ALL PERSONS BY THESE PRESENTS: That CNC DEVELOPMENT IV, LLC, a Minnesota limited
liability company, owner of the following described property:
The East half (E1/2) of the Northeast Quarter (NE 1/4) of Section 27, Township 115 North,
Range 19 West, Dakota County, Minnesota, excepting therefrom the following described
parcel:
The Southwest Quarter of the Southeast Quarter of the Northeast Quarter (SW1/4 of SE1/4
of NE1/4) of Section 27, Township 115 North, Range 19 West, Dakota County, Minnesota
Has caused the same to be surveyed and platted as EMERALD ISLE and does hereby dedicate to the
public for public use the public ways and the drainage and utility easements as created on this plat.
In witness whereof said CNC DEVELOPMENT IV, LLC, a Minnesota limited liability company, has
caused these presents to be signed by its proper officer this day of , 20 .
CNC DEVELOPMENT IV, LLC
By: its
STATE OF
COUNTY OF
This instrument was acknowledged before me on day of , 20 ,
by the
of CNC DEVELOPMENT IV, LLC, a Minnesota limited liability company, on behalf of the company.
County, Printed Name
My commission expires
I Marcus F. Hampton do hereby certify that this plat was prepared by me or under my direct
supervision; that I am a duly Licensed Land Surveyor in the State of Minnesota; that this plat is a
correct representation of the boundary survey; that all mathematical data and labels are correctly
designated on this plat; that all monuments depicted on this plat have been, or will be correctly set
within one year; that all water boundaries and wet lands, as defined in Minnesota Statutes, Section
505.01, Subd. 3, as of the date of this certificate are shown and labeled on this plat; and all public
ways are shown and labeled on this plat.
Dated this day of , 20
______________________________________________________________
Marcus F. Hampton, Licensed Land Surveyor, Minnesota License No. 47481
STATE OF MINNESOTA
COUNTY OF
This instrument was acknowledged before me on this day of ,
20 , by Marcus F. Hampton.
County, Printed Name
My commission expires January 31, 20
CITY PLANNING COMMISSION, CITY OF ROSEMOUNT, MINNESOTA
Approved by Planning Commission of the City of Rosemount, Minnesota this day of
, 20
By:
Chair
CITY COUNCIL, CITY OF ROSEMOUNT, MINNESOTA
This plat of EMERALD ISLE was approved and accepted by the City Council of the City of Rosemount,
Minnesota at a regular meeting thereof held this day of , 20 , and said
plat is in compliance with the provisions of Minnesota Statutes, Section 505.03, Subd. 2.
By:
Mayor Clerk
DAKOTA COUNTY SURVEYOR, COUNTY OF DAKOTA, STATE OF MINNESOTA
I hereby certify that in accordance with Minnesota Statutes, Section 505.021, Subd. 11, this plat has
been reviewed and approved this day of , 20 .
By:
Todd B. Tollefson, Dakota County Surveyor
COUNTY BOARD, COUNTY OF DAKOTA, STATE OF MINNESOTA
We do hereby certify that on the _____ day of _______________, 20___, the Board of
Commissioners of Dakota County, Minnesota, approved this plat of EMERALD ISLE and said plat is in
compliance with the provisions of Minnesota Statutes, Section 505.03, Subd. 2, and pursuant to the
Dakota County Contiguous Plat Ordinance.
By: ___________________________________ Attest: ___________________________________
Chair, Dakota County Board Dakota County Treasurer - Auditor
DAKOTA COUNTY DEPARTMENT OF PROPERTY TAXATION AND RECORDS,
COUNTY OF DAKOTA, STATE OF MINNESOTA
Pursuant to Minnesota Statutes, Section 505.021, Subd. 9, taxes payable in the year 20 on the
land hereinbefore described have been paid. Also pursuant to Minnesota Statutes, Section 272.12,
there are no delinquent taxes and transfer entered this day of , 20 .
By:
Amy A. Koethe, Director,
Department Of Property Taxation and Records
COUNTY RECORDER, COUNTY OF DAKOTA, STATE OF MINNESOTA
I hereby certify that this plat of EMERALD ISLE was filed in the office of the County Recorder for public
record on this day of , 20 , at o'clock . M.
and was duly filed in Book of Plats, Page ,
as Document Number .
By:
Amy A. Koethe, County Recorder
DENOTES RESTRICTED ACCESS TO DAKOTA
COUNTY PER THE DAKOTA COUNTY
CONTIGUOUS PLAT ORDINANCE
VICINITY MAP
BEARINGS ARE BASED ON THE EAST LINE OF THE E 1/2
OF THE NE 1/4 OF SEC. 27, T. 115, R. 19 WHICH IS
ASSUMED TO HAVE A BEARING OF N 00°24'42" E
NOTE: NO MONUMENT SYMBOL SHOWN AT ANY STATUTE
REQUIRED LOCATION INDICATES A PLAT MONUMENT THAT WILL
BE SET WITHIN ONE YEAR FROM THE RECORDING DATE OF THIS
PLAT. SAID MONUMENTS SHALL BE 1/2 INCH x 14 INCH
IRON PIPES MARKED BY R.L.S. NO. 47481.
DRAINAGE AND UTILITY EASEMENTS BEING
5 FEET IN WIDTH, UNLESS OTHERWISE
INDICATED, ADJOINING LOT LINES, AND
BEING 10 FEET IN WIDTH, UNLESS
OTHERWISE INDICATED, ADJOINING RIGHT
OF WAY LINES, AS SHOWN ON THE PLAT.
DRAINAGE AND UTILITY EASEMENTS
ARE SHOWN THUS:
MEMORANDUM
To: Kim Lindquist, Community Development Director
Kyle Klatt, Senior Planner
Anthony Nemcek, Planner
From: Dan Schultz, Parks and Recreation Director
Date: February 18, 2020
Subject: Emerald Isle - CNC Development Master PUD and Preliminary Plat
The Parks and Recreation Department recently reviewed the plans for the Emerald Isle
development. After reviewing the plans, the Parks and Recreation Department staff has the
following comments:
Local Trails and Sidewalks
The trail and sidewalk amenities appear to be designed in a manner that works toward the City’s goal
of having a well-connected community. The proposed trail and sidewalk system is designed to match
up to the existing/proposed system. Staff does recommend that accommodations are made for a
trail to be added along County Road 42 in the future.
Parks Dedication
The parks dedication requirement for 151 single family units is either 6.04 acres of land, cash in-lieu
of land or a combination of the two. Staff is recommending that the City collect cash in-lieu of land
for the single-family development that is currently being processed. The cash dedication for 151
units would be $513,400 (151 x $3,400 per unit).
Please let me know if you have any questions about this memo.
MEMORANDUM
To: Anthony Nemcek, Planner
CC: Kim Lindquist, Community Development Director
Stacy Bodsberg, Planning & Personnel Secretary
Brian Erickson, Director of Public Works/City Engineer
From: Stephanie Smith, Assistant City Engineer
Date: August 25, 2020
Subject: Emerald Isle Final Plat - Engineering Review
SUBMITTAL:
The plans for Emerald Isle have been prepared by James R. Hill, Inc. Engineering review
comments were generated from the following preliminary documents included in the submittal:
▫ Final Plat (dated 8/10/2020)
▫ Existing Conditions Survey (dated
8/12/2020)
▫ Erosion and Sediment Control Plan
(dated 8/12/2020)
▫ Grading Plan (dated 8/12/2020)
▫ Street and Utility Plan (dated
8/12/2020)
▫ Stormwater Report (dated
8/12/2020)
▫ Phasing Plan (dated 1/13/2020)
GENERAL COMMENTS:
1. The development fees below are estimated based on the current Schedule of Rates and
Fees. These fees are due with the final plat and subdivision agreement.
Sanitary Sewer Trunk Charge: $1075/acre
Watermain Trunk Charge: $6500/acre
Storm Sewer Trunk Charge: $6865/acre
2. Plans shall be signed by an engineer licensed in the state of Minnesota.
3. Outlot A and B shall be covered by drainage and utility easement.
4. Outlot A shall be dedicated to the City.
5. As the review of the construction plans is ongoing, the developer shall incorporate
future comments on the construction plans from the Engineering staff in order to
comply with Rosemount Engineering Guidelines and Standard Specifications.
STREET AND SIDEWALK
This addition of Emerald Isle consists of internal, local streets that connect to the existing
Addison Avenue stub at the eastern property line. 5-foot sidewalks are on one side of the streets
throughout the development.
6. Street slopes and profile drawings shall be reviewed with the construction plans for
consistency with the Engineering Guidelines.
7. Lot 50, Block 1 shall have the driveway constructed on the west side of the property to
allow the occupant vehicles to turn around on the dead-end street.
8. Type-three barricades with “Future Thru Street” signage shall be at the end of 142nd
Street and Aspen Avenue.
9. Temporary cul-de-sac shall be constructed at the end of Aspen Avenue. Temporary
roadway easement shall be granted on Outlot B for the cul-de-sac.
10. MnDOT standard detail plates for ADA pedestrian ramps shall be included in the plan
set.
11. Street signage and lighting plan shall be submitted for review.
12. Addison Avenue typical street section shall match the existing section.
WATER AND SANITARY SEWER
13. Sanitary sewer shall be stubbed to the eastern property line at an elevation to provide
service to future development.
14. The applicant proposes two connections to the Metropolitan Council’s interceptor sewer
line. Applicant must obtain permits for these connections. Staff recommends one
connection.
15. Sanitary sewer connections shall be core-drilled.
16. Staff recommends using a 0.50% slope for 8” sanitary sewer to ensure that construction
minimums are met.
17. Applicant’s engineer shall work with staff to reduce the number of sanitary manhole
structures.
18. Lots 1-3, Block 4 shall be serviced from sanitary sewer from the south rather than tying-
in to the north line on Addison Avenue. This would also eliminate SSMH-2.
19. Watermain under Connemara Trail shall be 12” diameter.
20. All watermain shall be ductile iron pipe.
21. Number and locations of valve shall be adjusted to meet Engineering Guidelines.
22. Connections to active mains shall be wet taps.
23. As-built are not available for the utility connections to the Prestwick Place 17th
development. Applicant’s engineer shall verify locations in the field.
STORMWATER
The applicant proposes to meet the City’s stormwater requirements by constructing retention
and infiltration basins on their site.
24. Applicant proposes a swale and stormwater pipe within the Metropolitan Council
easement. Applicant shall obtain applicable permits for this work.
25. Access routes to ponds and yard catchbasins shall meet Engineer Guidelines and be
shown on the plans.
26. Upon completion of the infiltration basin, the applicant’s engineer shall submit
infiltrometer testing to certify the functionality of the basin as modeled.
27. Applicant’s engineer shall work to reduce the number of storm structures.
The City’s stormwater consultant reviewed the submittal and their comments are listed below.
The full memorandum is attached.
28. Modify the 100-year HWL and 10-day HWL listed in the plans for Pond 101P to
match the HydroCAD output.
29. Block 3, Lots 1 and A14 low opening are lower than the low point in the road.
30. Please indicate reasoning behind not installing proposed storm sewer toward basin
101P and instead grading a ditch that will be filled in.
31. There is currently no plan to complete the grading of basin 101P. Please indicate
reasoning behind not constructing the infiltration basin.
32. CB-112 and CB-111 should be moved to be along lot lines and not within a
driveway. Please include driveway locations.
33. Infiltration area listed on the plans does not match the stormwater narrative nor the
total area shown. Modify the stormwater narrative 101P provided infiltration surface
area to match the plans (the ‘note’ acreage matches the plans but the provided
infiltration zone does not match).
The following comments apply to the stormwater of the full development, not only this
phase:
34. No operation and maintenance plan was included with this submittal
35. Coordination with the county will be required to route drainage from county ROW
to NURP basin. The outlet control structure will be permitted to discharge at a rate
that matches existing discharge rates.
36. Currently County ROW is not be routed to pond 107P. Please see attached for
proposed grading map. Remove berm along 42 and connect NURP pond to expand
into grading.
37. Connect County flared end section basin 107P. Current drainage plan shows flared
end section discharges to existing ditch and bypasses the proposed basin.
38. The impervious quantification varies between the proposed drainage area map and
the proposed HydroCAD model for 1030S. 1.624 acres is shown on the plans and
1.897 is given in HydroCAD.
39. Regional Outlet control structure will be required for basin 107P and 101P. Utilize
Rosemount Skimmer Structure Standard Detail (SD-11).
40. Please include drainage of proposed right of way for Street 20 in drainage to 103P.
The centerline looks to be included in plans, but not its drainage. i. Please include
more information on the centerline for Street 20. What is currently shown does not
match the PUD plans and we cannot verify the drainage area shown for this area.
41. The pond notes describing the OLE and HWL for Ponds 101P, 102P, and 103P vary
between the grading plan and the utility plan. Modify for consistency.
42. HydroCAD outlet pipe differs in length and size for 103P. The plan shows a 170
foot 15” RCP while HydroCAD shows a 170 foot 18” RCP.
43. The outlet invert on the detail for Pond 101P is inconsistent with the plans and
HydroCAD.
44. Modify the 10-day HWL listed in the plans for Pond 102P, 103P, and 107P to match
the HydroCAD output.
45. Provide a designated EOF section for 107P.
46. From the grading plan, drainage area 1080S and 42S would drain to pond 107P in
the proposed condition. Update model to reflect this, or revise grading to propose
ditch drainage going to Besser property.
47. Storm sewer pipe runs must not exceed 300 feet. Revise CBMH-403 to CBMH-402
48. Include proposed storm sewer for draining 1070S to verify drainage area of 107P.
49. Please verify if the submittal needs permits for creation of ponding on top of a gas
line and over easement at 107P, and 103P.
50. Provide a minimum of 1 foot of freeboard from the basin HWL and the basement
floor elevation. The following buildings are not in compliance. 1. Block 4, Lots 1, 2
51. Provide a minimum of 1.5 feet of freeboard from the Emergency Overflow Route
and the Low Opening. The following buildings are not in compliance: Block 4 lot 44,
Block 6 Lots 1
52. Block 5 Lot 8-9 low openings are lower than the low point in the road.
53. Utility easements will be verified once storm sewer profiles are provided.
Should you have any questions or comments regarding the items listed above, please contact me
at 651-322-2015.
Attached: WSB Memorandum RE: Emerald Isle – Courteau Property Plan Review dated August
20, 2020
K:\015413-000\Admin\Docs\08202020 Review\015413-000-Emerald_Isle-08202020.docx 701 XENIA AVENUE S | SUITE 300 | MINNEAPOLIS, MN | 55416 | 763.541.4800 | WSBENG.COM Memorandum
To: Stephanie Smith, City of Rosemount
From: Bill Alms, WSB
Laura Cummings, WSB
Date: August 20, 2020
Re: Emerald Isle – Courteau Property Plan Review
WSB Project No. R-015413-000
We have reviewed the documents provided by James R. Hill, Inc. and CALYX Design Group on
08/12/20 for the Emerald Isle – Courteau Property Plan development. Documents Reviewed
include:
• Stormwater Management Narrative and Summary for The Courteau Site – dated 8-11-
2020
• Emerald Isle Final Plans– dated 8-12-2020
• Emerald Isle Preliminary Site Development Plans – dated 4-14-2020
Based on our review of the plan we offer the following comments for your consideration.
Specific Phase 1 Comments
Grading Plan Comments:
a. Modify the 100-year HWL and 10-day HWL listed in the plans for Pond 101P to
match the HydroCAD output.
b. Block 3 Lots 1 and A14 low opening are lower than the low point in the road.
c. Please indicate reasoning behind not installing proposed storm sewer toward
basin 101P and instead grading a ditch that will be filled in.
d. There is currently no plan to complete the grading of basin 101P. Please indicate
reasoning behind not constructing the infiltration basin.
Storm Sewer Comments:
a. CB-112 and CB-111 should be moved to be along lot lines and not within a
driveway. Please include driveway locations.
Infiltration Comments:
a. Infiltration area listed on the plans does not match the stormwater narrative nor the total
area shown.
i. Modify the stormwater narrative 101P provided infiltration surface area to
match the plans (the ‘note’ acreage matches the plans but the provided
infiltration zone does not match).
Outstanding General Comments
Grading, Drainage, and Erosion Control Comments:
2. General:
a. No operation and maintenance plan was included with this submittal.
3. Basins:
Ms. Stephanie Smith
August 20, 2020
Page 2
K:\015413-000\Admin\Docs\08202020 Review\015413-000-Emerald_Isle-08202020.docx
a. Coordination with the county will be required to route drainage from county ROW
to NURP basin. The outlet control structure will be permitted to discharge at a
rate that matches existing discharge rates.
b. Currently County ROW is not be routed to pond 107P. Please see attached for
proposed grading map. Remove berm along 42 and connect NURP pond to
expand into grading.
c. Connect County flared end section basin 107P. Current drainage plan shows
flared end section discharges to existing ditch and bypasses the proposed basin.
d. The impervious quantification varies between the proposed drainage area map
and the proposed HydroCAD model for 1030S. 1.624 acres is shown on the
plans and 1.897 is given in HydroCAD.
e. Regional Outlet control structure will be required for basin 107P and 101P.
i. Utilize Rosemount Skimmer Structure Standard Detail (SD-11).
f. Please include drainage of proposed right of way for Street 20 in drainage to
103P. The centerline looks to be included in plans, but not its drainage.
i. Please include more information on the centerline for Street 20. What is
currently shown does not match the PUD plans and we cannot verify the
drainage area shown for this area.
g. The pond notes describing the OLE and HWL for Ponds 101P, 102P, and 103P
vary between the grading plan and the utility plan. Modify for consistency.
h. HydroCAD outlet pipe differs in length and size for 103P. The plan shows a 170
foot 15” RCP while HydroCAD shows a 170 foot 18” RCP.
i. The outlet invert on the detail for Pond 101P is inconsistent with the plans and
HydroCAD.
j. Modify the 10-day HWL listed in the plans for Pond 102P, 103P, and 107P to
match the HydroCAD output.
4. Emergency Overflow Routes:
a. Provide a designated EOF section for 107P.
5. Retaining Walls:
a. Not applicable.
6. Erosion Control:
a. No comments.
7. Grading:
a. From the grading plan, drainage area 1080S and 42S would drain to pond 107P
in the proposed condition. Update model to reflect this, or revise grading to
propose ditch drainage going to Beser property.
Stormwater Management Plan:
8. General Storm Sewer Design:
a. Storm sewer pipe runs must not exceed 300 feet.
i. The following pipe runs are not in compliance.
1. CBMH 403-402
b. Include proposed storm sewer for draining 1070S to verify drainage area of
107P.
9. Water Quality:
a. No comments.
10. Rate Control:
Ms. Stephanie Smith
August 20, 2020
Page 3
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a. Please verify if the submittal needs permits for creation of ponding on top of a
gas line and over easement at 107P, and 103P.
11. Freeboard:
a. Provide a minimum of 1 foot of freeboard from the basin HWL and the basement
floor elevation.
i. The following buildings are not in compliance.
1. Block 4, Lots 1, 2
b. Provide a minimum of 1.5 feet of freeboard from the Emergency Overflow Route
and the Low Opening.
i. The following buildings are not in compliance.
1. Block 4 lot 44
2. Block 6 Lots 1
c. Block 5 Lot 8-9 low openings are lower than the low point in the road.
12. Wetlands:
a. No wetlands are shown on the plans.
13. Easements:
a. Utility easements will be verified once storm sewer profiles are provided.