HomeMy WebLinkAbout6.a. Keegan Lake Drainage Improvement Feasability Study Update
EXECUTIVE SUMMARY
Utility Commission Meeting: February 27, 2017
AGENDA ITEM: Keegan Lake Drainage Improvement
Feasibility Study Update
AGENDA SECTION:
New Business
PREPARED BY: John Morast, PE, Interim Public Works
Director AGENDA NO: 9.a.
ATTACHMENTS: WSB Feasibility Study Update Report APPROVED BY: LM
RECOMMENDED ACTION: None
BACKGROUND
The City of Rosemount Surface Water Management Plan identifies the existing and the ultimate
stormwater management system. The plan identifies land and water resource inventory; provides an
assessment of problems and corrective actions; establishes goals and policies and developed an
implementation priorities and programs.
Section VI of the Plan (Implementation Priorities/Implementation Program) identifies 18 projects as high
priority. The Keegan Lake Storm Improvements is listed in this group of projects. A feasibility study was
performed in 2009 to see if stormwater improvements could be included in the Bonaire Path
Improvement project. The improvements were shown to be feasible, but an easement was required by the
landowner which they were not willing to provide. The Bonaire Path Improvement project was then
constructed without including Keegan Lake Draining improvements.
The recent wet weather and a change in ownership of the easement property prompted discussions on the
Keegan Lake area drainage improvement s again. On October 17, 2016, the Utility Commission discussed
the stormwater CIP and the past Keegan Lake study work. It was determined that updating the feasibility
report would provide additional information on the project, update Stormwater rainfalls amounts,
investigate alternatives and help determine if the project is a viable project at this time. In November,
2016, the City entered into an agreement for WSB to update the Keegan Lake Feasibility study. The study
has been completed, including updating rainfalls to Atlas 14 and reviewing the possibility of a stormwater
connection across Bonaire path to the south. The report also recommends providing some sanitary sewer
improvements to extend a sanitary sewer pipe across one section of new storm drainage.
Staff is presenting the updated report findings to further discuss the project, its feasibility and alternatives.
SUMMARY
Staff is looking for direction to proceed with one of the following:
1. Proceed with the project as recommended in the updated feasibility report
2. Proceed with changes to the project
3. Delay the project pending the Surface Water Management Plan Update during the Comprehensive
Plan Update process
4. Delay the project and utilize funds for other storm drainage projects
5. Do not proceed with the project
G:\UTILITY COMMISSION\UC Information\UC Items and Packets\2017\20170227\6.a. Keegan Lake Drainage Improvement Feasability Study Update.docx
Feasibility Report
Keegan Lake Drainage Improvements Update 2017
City Project No. ENG 0132
City of Rosemount, MN
WSB Project No. 2235-31
FEASIBILITY REPORT
KEEGAN LAKE DRAINAGE IMPROVEMENTS
FOR THE
CITY OF ROSEMOUNT, MINNESOTA
CITY PROJECT NO. ENG 0132
February 17, 2009
Updated February 3, 2017
Prepared By:
WSB & Associates, Inc.
701 Xenia Avenue South, Suite 300
Minneapolis, MN 55416
763-541-4800
763-541-1700 (Fax)
Feasibility Report
Keegan Lake Drainage Improvements Update 2017
City Project No. ENG 0132
City of Rosemount, MN
WSB Project No. 2235-31
CERTIFICATION
I hereby certify that this plan, specification, or report was prepared by me or
under my direct supervision and that I am a duly Licensed Professional Engineer
under the laws of the State of Minnesota.
Bill Alms, PE
Date: February 3, 2016 Lic. No. 54301
Feasibility Report
Keegan Lake Drainage Improvements Update 2017
City Project No. ENG 0132
City of Rosemount, MN
WSB Project No. 2235-31
TABLE OF CONTENTS
1. EXECUTIVE SUMMARY ............................................................................................................................. 1
2. INTRODUCTION ........................................................................................................................................ 2
2.1 Authorization .................................................................................................................................... 2
2.2 Scope ................................................................................................................................................. 2
2.3 Data Available ................................................................................................................................... 2
3. GENERAL BACKGROUND .......................................................................................................................... 4
3.1 Project Location ................................................................................................................................ 4
3.2 Project Zoning ................................................................................................................................... 4
3.3 Project Need ..................................................................................................................................... 4
4. PROPOSED IMPROVEMENTS .................................................................................................................... 6
4.1 Streets ............................................................................................................................................... 6
4.2 Sanitary Sewer .................................................................................................................................. 7
4.3 Storm Sewer ...................................................................................................................................... 7
4.4 Water Quality .................................................................................................................................... 9
4.5 Alternative Outlet Option ................................................................................................................. 9
4.6 Existing Utilities ............................................................................................................................... 10
4.7 Permits/Approvals .......................................................................................................................... 11
4.8 Right-of-Way/Easements ................................................................................................................ 11
5. FINANCING ............................................................................................................................................. 12
5.1 Opinion of Cost ............................................................................................................................... 12
5.2 Funding ........................................................................................................................................... 12
6. PROJECT SCHEDULE ................................................................................................................................ 13
7. FEASIBILITY AND RECOMMENDATION ................................................................................................... 14
Appendix A
Figure 1 – Location Map
Figure 2 – Proposed Improvements
Figure 4 - KL-1521 Alternate Outlet
Appendix B
Opinion of Probable Cost
Appendix C
Figure 3 – Proposed Easement Requirements
Easement Tabulation
Feasibility Report
Keegan Lake Drainage Improvements Update 2017
City Project No. ENG 0132
City of Rosemount, MN
WSB Project No. 2235-31 Page 1
1. EXECUTIVE SUMMARY
The Keegan Lake Drainage Improvements project, City Project No. ENG 0132, includes the installation of a series of
storm sewer outlets to several landlocked stormwater basins upstream of Keegan Lake. Installation of these
outlets will provide flood protection to adjacent properties and will complete an improvement identified as a goal
in the Comprehensive Stormwater Management Plan (SWMP). The sanitary sewer on 132nd Court is also proposed
to be extended north past the proposed storm sewer for future connection.
The total estimated project cost is $476,400 which includes a 10% contingency and 30% indirect costs. This entire
amount is proposed to be funded by the Storm Sewer Utility Fund.
It is proposed that construction begin in June 2017 and it is anticipated to be completed, including all restoration
items, by the fall of 2017. This project is feasible, necessary, and cost-effective from an engineering standpoint,
and should be constructed as proposed herein.
Feasibility Report
Keegan Lake Drainage Improvements Update 2017
City Project No. ENG 0132
City of Rosemount, MN
WSB Project No. 2235-31 Page 2
2. INTRODUCTION
2.1 AUTHORIZATION
On December 18, 2006, the Utility Commission authorized the preparation of an engineering feasibility report for
the Keegan Lake Drainage Improvements. This project has been designated as City Project Number ENG 0132. On
October 21, 2016, an update to the feasibility report was approved. These updates included modeling the
stormwater basins using Atlas 14 rainfall data to determine new high water levels and storm sewer sizing and
adding an alternative outlet option for basin KL-1521 into the Bonaire storm sewer system. The opinion of costs
was also updated to reflect 2017 costs. A project location map is shown on Figure 1 of Appendix A.
2.2 SCOPE
The Utility Commission authorized WSB & Associates, Inc. to complete a feasibility report for the installation of a
series of storm sewer outlets to provide emergency overflows for several landlocked stormwater basins upstream
of Keegan Lake. This feasibility study identifies key stormwater elevations, proposes the most viable drainage
improvements, and presents cost estimates detailing the proposed work and easement requirements.
2.3 DATA AVAILABLE
Information and materials used in the preparation of this report include the following:
City of Rosemount Record Plans
City of Rosemount Topography Maps
Field Survey by WSB & Associates, Inc.
Field Observations of the Area
Private Utility Maps
Private Utility Field Markings Surveyed by WSB & Associates, Inc.
Rosemount Comprehensive Stormwater Management Plan
Rosemount Wetland Management Plan
Feasibility Report
Keegan Lake Drainage Improvements Update 2017
City Project No. ENG 0132
City of Rosemount, MN
WSB Project No. 2235-31 Page 3
Aerial Photo of Project Location
Feasibility Report
Keegan Lake Drainage Improvements Update 2017
City Project No. ENG 0132
City of Rosemount, MN
WSB Project No. 2235-31 Page 4
3. GENERAL BACKGROUND
3.1 PROJECT LOCATION
The project includes several existing ponds located in the northwestern portion of the City which are bound by
Bonaire Path to the south, Trunk Highway 3 (TH 3) to the west, 130th Street to the north and the Chicago,
Milwaukee, St. Paul, and Pacific Railroad to the east. The ponds proposed for improvement within these limits
include the following as identified in the SWMP:
• Pond 1431 (Keegan Lake): Located northwest of the intersection of Bonaire Path and the Chicago,
Milwaukee, St. Paul, and Pacific Railroad.
• Pond 1483: Located approximately 700 feet north of the west intersection of Bonaire Path and 132nd
Court.
• Pond 1405: Located northeast of the intersection of 130th Street and Bolivia Path.
• Pond 1355: Located northwest of the intersection of 130th Street and Bolivia Path.
• Pond 2472: Located southwest of the intersection of 130th Street and Bolivia Path.
• Pond 1465: Located approximately 300 feet south of the intersection of 130th Street and TH 3.
• Pond 1521: Located northeast of the intersection of Bonaire Path and TH 3.
• Pond 1435: Located approximately 100 feet west of the intersection of 130th Street and TH 3.
3.2 PROJECT ZONING
The area east of TH 3 is zoned TR – Transitional Residential and the area west of TH 3 is zoned RR – Rural
Residential.
3.3 PROJECT NEED
According to Rosemount’s SWMP, seven upstream ponds within the Keegan Lake Drainage District are proposed to
outlet downstream to Keegan Lake. The plan proposes connecting these landlocked basins to Keegan Lake to
provide flood protection for the adjacent properties and to maintain defined shorelines. This improvement
establishes pond elevations for the 24-hour, 100 year event to protect against high water during large rain events
while maximizing stormwater storage. These ponds have been identified on Figure 2 of Appendix A with the pond
ID number assigned to them by Rosemount’s SWMP.
Currently, the seven ponds directly upstream of Keegan Lake receive approximately 138 acres of total drainage
from their surrounding watersheds. According to the SWMP, the outlet rates that to be maintained for the 24-
hour, 100 year storm event are 1.8 cfs from Pond 1521, 4.46 cfs from Pond 1355, 4.50 cfs from Pond 1405, and
4.82 cfs from Pond 1483. These volumes of water are far too high for infiltration, evaporation, or additional
storage given the land constraints and volume of required storage. In the past, flooding has occurred during larger
rain events at the property east of Pond 1521.
Feasibility Report
Keegan Lake Drainage Improvements Update 2017
City Project No. ENG 0132
City of Rosemount, MN
WSB Project No. 2235-31 Page 5
To date, ponds 1435, 1521, 1465, 2472, and 1483 have not been delineated and therefore the normal water
elevation has not been established. The Department of Natural Resources (DNR) has marked the ordinary high
water (OHW) level of Pond 1355 at 941.73 and Pond 1405 at 942.41. The DNR has established the OHW for
Keegan Lake to be at 942.2. The Keegan Lake outlet is permitted 1.5’ below the OHW at 940.7 which meets the
draw down limit set by the DNR. With a constructed outlet for each of the ponds, the Rosemount’s SWMP
proposes the approximate normal water level elevation and high water level for each of the ponds as shown
below.
• Pond 1435 – NWL: 944.00 HWL: 944.97
• Pond 1521 – NWL: 954.00 HWL: 954.65
• Pond 1465 – NWL: 943.50 HWL: 944.35
• Pond 2472 – NWL: 942.70 HWL: 944.34
• Pond 1355 – NWL: 942.70 HWL: 944.27
• Pond 1405 – NWL: 942.50 HWL: 944.10
• Pond 1483 – NWL: 941.50 HWL: 943.18
• Keegan Lake – NWL: 940.70 HWL: 942.18
Pond 1355 (Facing West)
Feasibility Report
Keegan Lake Drainage Improvements Update 2017
City Project No. ENG 0132
City of Rosemount, MN
WSB Project No. 2235-31 Page 6
4. PROPOSED IMPROVEMENTS
4.1 STREETS
The proposed street improvements include removal and replacement of the roadway impacted by the installation
of storm sewer and sanitary sewer. This includes the storm sewer crossing at 130th Street, the sanitary sewer
connection at the manhole in 132nd Court, and driveway replacement for the Zorn property and properties along
TH 3.
Typical roadway replacement includes excavation to accommodate the following sections:
130th Street & 132nd Court
• 4 inches bituminous pavement
• 8 inches class V aggregate base
• 24 inches select granular
Driveway replacement
• 8 inches class V aggregate base
or
• 3 inches bituminous pavement
• 6 inches class V aggregate base
All residents will have access to their properties during construction; however, some inconvenience is anticipated
when storm sewer or sanitary sewer is installed across a roadway or driveway.
Driveway south of Pond 1465 (Facing Northeast)
Feasibility Report
Keegan Lake Drainage Improvements Update 2017
City Project No. ENG 0132
City of Rosemount, MN
WSB Project No. 2235-31 Page 7
4.2 SANITARY SEWER
The proposed sanitary sewer improvements consist of installing an 18-inch sanitary sewer line north from a
manhole in 132nd Court through the Zorn property for future connection. The sanitary sewer is proposed to be
installed 10 feet north of the storm sewer crossing between Pond 1483 and Keegan Lake to avoid future crossing
conflicts between the two lines. The existing stub north to the Zorn property will need to be removed.
Proposed sanitary sewer improvements are shown on Figure 2 of Appendix A.
4.3 STORM SEWER
Given the need for flood prevention, a series of four downstream outlets have been proposed at Ponds 1521,
1355, 1405 and 1483 along with a weir located at the outlet to Pond 1435. These improvements, in conjunction
with the existing overland swales and storm sewer drainage connections, provide flood protection for 24-hour, 100
year storm event. The pond high water levels have been updated from the original feasibility report using Atlas 14
rainfall data.
Proposed storm sewer improvements are shown on Figure 2 of Appendix A and are also listed below with their
corresponding design elevations.
• Pond 1435 to Pond 1465
o Installation of a weir at existing outlet
Weir elevation = 944.00
Weir to be located west of an existing small utility access
• Pond 1521 to Pond 1465
o Installation of an outlet control structure and storm sewer between ponds
Outlet elevation = 952.30
15-inch reinforced concrete (RC) pipe to the outlet structure
15-inch RC pipe and 2 - 48-inch manholes from the outlet structure to Pond 1465
Apron, riprap and geotextile fabric at Pond 1465
Utility coordination or relocation will be required along TH 3
• Pond 1465 to Pond 2472
o No improvements are proposed
o A permanent easement is proposed for future maintenance of an existing swale at the elevation
of 943.00
Feasibility Report
Keegan Lake Drainage Improvements Update 2017
City Project No. ENG 0132
City of Rosemount, MN
WSB Project No. 2235-31 Page 8
• Pond 1355 to Pond 1405
o Removal of existing storm sewer and installation of 18-inch RC pipe storm sewer
Outlet elevation = 942.50
Apron, riprap and geotextile fabric at Pond 1405
• Pond 1405 to Pond 1483
o Installation of an outlet control structure and storm sewer between ponds
Outlet elevation = 942.50
18-inch RC pipe storm sewer from outlet structure to Pond 1483
Apron, riprap and geotextile fabric north of Pond 1483
A riprap swale with a 5-foot bottom between apron and Pond 1483
• Pond 1483 – Keegan Lake
o Installation outlet control structure and storm sewer between ponds
Outlet elevation = 941.50
30-inch RC pipe storm sewer from the outlet structure to Keegan Lake
Apron, riprap and geotextile fabric at Keegan Lake
A summary of the proposed NWL and HWL are listed below.
TABLE 1: POND SUMMARY
Pond ID NWL HWL (TP-40) HWL (Atlas 14) Ex Low Building
Opening (ft)
KL-1435 944.00 944.97 945.34 954.0
KL-1521 952.30 953.29 953.73 1 955.3
KL-1465 942.50 944.32 944.95 948.75
KL-2472 942.50 944.30 944.95 950.0
KL-1355 942.50 944.30 944.94 947.75
KL-1405 942.50 944.06 944.57 950.0
KL-1483 941.50 942.62 943.05 953.5
Keegan Lake- 1431 940.70 942.16 942.78 946.0
1 NWL would need to be set at 951.6’ to provide 2 ft of freeboard.
Feasibility Report
Keegan Lake Drainage Improvements Update 2017
City Project No. ENG 0132
City of Rosemount, MN
WSB Project No. 2235-31 Page 9
Pond 1405 (Facing East)
4.4 WATER QUALITY
Water quality of Keegan Lake was mentioned as a concern. Each basin is designed to meet NURP requirements for
water quality treatment. Research has shown that basins designed to meet these requirements remove up to 90%
TSS and 60% total phosphorus (TP). By connecting the upstream ponds to Keegan Lake, there should be minimal
impact on the existing loading.
4.5 ALTERNATIVE OUTLET OPTION
An alternative outlet option for basin KL-1521 was discussed to help alleviate high water levels during large rain
events. This option proposes connecting an outlet from the basin to the storm sewer system along Bonaire Path to
the south. This storm sewer system ultimately discharges to basin KL-1687.
• Pond 1521 to Pond 1687
o Installation of an outlet control structure and storm sewer between ponds
Outlet elevation = 953.55
15-inch reinforced concrete (RC) pipe to the outlet structure 5134 along Bonaire Path
Feasibility Report
Keegan Lake Drainage Improvements Update 2017
City Project No. ENG 0132
City of Rosemount, MN
WSB Project No. 2235-31 Page 10
The existing Bonaire Path storm sewer system, as designed in 2006, currently has capacity to handle the new flow
from Pond 1521. No pipe or structure downstream to final discharge at Pond 1687 will be affected with the
additional flow.
The adjacent home located near Pond 1521 has a low floor elevation of 955.3, as measured in the Keegan Lake
survey. The City Engineering Guidelines require at least 3 feet of freeboard between the 100-year HWL and the
minimum building opening. Required freeboard can be lowered to 2 feet with City Engineer’s approval.
The Pond 1521 proposed outlet would connect into the Bonaire Path storm sewer system at structure 5134. The
invert elevation of this structure based on the record as-built drawings is 952.08’. To achieve a minimum pipe
slope of 0.4% for the storm sewer and connect into this structure, the minimum pipe outlet from Pond 1521 would
need to be 953.55. This would raise the 100-year HWL of Pond 1521 to an elevation of 954.69, which does not
meet the freeboard requirements of the City for the existing structure.
The 100-year HWL elevation of Pond 1521 with an outlet at 952.30 is 953.73.
4.6 EXISTING UTILITIES
According to the Gopher State One Call, private utilities in the area include:
• City of Rosemount
• Dakota Electric
• Fiber to the Home
• Frontier Communications
• Independent School District #196
• Koch Pipelines
• Minnesota Energy Resources Corporation
• Northern Natural Gas
• Xcel Energy - Gas
• Xcel Energy – Electric
• Charter Communications
• Unknown – Regulated by SMP
• Magellan Midstream Partners
Private utilities that are not within their own easement are responsible for the costs to hold or relocate utilities
serving local residents; however, utilities within their own easement or private property may require the project to
incur additional cost for coordination and relocation. Private utilities within Mn/DOT right-of-way are there by
permit with Mn/DOT and will be held or relocated at the cost of the City. No private utility relocation costs have
been included with this project.
Feasibility Report
Keegan Lake Drainage Improvements Update 2017
City Project No. ENG 0132
City of Rosemount, MN
WSB Project No. 2235-31 Page 11
4.7 PERMITS/APPROVALS
The anticipated permits and approvals that will be required for this project and the respective regulatory agencies
are listed below:
• Minnesota Department of Transportation ....................................................... Work within the Right-of-Way
• DNR Permit ..................................................................... Work within Pond 1355, Pond 1405, & Keegan Lake
• Dewatering Permit .................................................................................................................. Minnesota DNR
• Minnesota Pollution Control Agency ............................................... National Pollutant Discharge Elimination
System (NPDES) General Stormwater Permit
For Construction Activity (MN R100001)
• Minnesota Pollution Control Agency ........................................................................................ Sanitary Sewer
4.8 RIGHT-OF-WAY/EASEMENTS
It is recommended that a combination of permanent and temporary utility easements as well as permits within the
existing right-of-way be secured along the entire length of the improvements. The intent of the project is to
secure the required easements through easement dedication by each of the required property owners in exchange
for the City funding the drainage improvements. However, due to the local topography, some of the required
easements are located on properties that may not directly benefit from the improvements.
Easements not secured through dedication may be purchased if they are deemed critical to the completion of the
project and would otherwise prohibit additional upstream improvements. This issue will need to be addressed
prior to final design to prevent unnecessary design work. If land acquisition is used, a variation of land value is
expected based on current market value as well as easement location within a specific parcel. Attached in
Appendix C is a table showing the approximate easement value based on a percentage of the current lot value and
could be starting point of negotiation between the City and property owner. These values have been included
with the cost of the project but an appraisal will be necessary to determine the exact value of each property and
required easement.
Feasibility Report
Keegan Lake Drainage Improvements Update 2017
City Project No. ENG 0132
City of Rosemount, MN
WSB Project No. 2235-31 Page 12
5. FINANCING
5.1 OPINION OF COST
Detailed opinions of cost can be found in Appendix B of this report. The opinion of probable cost incorporates
estimated 2017 construction costs and includes a 10% contingency and 30% for all related indirect costs (legal,
administrative, engineering, and financing).
Table 2 below provides a summary of the opinion of cost for the Keegan Lake Drainage Improvements:
Table 2 - Summary of Cost
Total
Schedule A - Surface Improvements $101,600
Schedule B - Sanitary Sewer Improvements $22,600
Schedule C - Storm Sewer Improvements $296,400
Easements $55,800
Total $476,400
An easement tabulation table showing the proposed easements and approximate costs has been included in
Appendix C of this report. The costs have been calculated based on a percentage of the current lot value;
however, an appraisal will be necessary to determine the exact value of each property and required easement.
5.2 FUNDING
Financing for the Keegan Lake Drainage Improvements project is proposed to be fully funded through the Storm
Sewer Utility Fund as shown below on Table 3.
Table 3 - Proposed Funding
Total
Storm Sewer Utility Fund $476,400
Total $476,400
Feasibility Report
Keegan Lake Drainage Improvements Update 2017
City Project No. ENG 0132
City of Rosemount, MN
WSB Project No. 2235-31 Page 13
6. PROJECT SCHEDULE
The proposed project schedule for the Keegan Lake Drainage Improvements is as follows: (To be Updated)
Public Informational Meeting ................................................................................................... November 13, 2007
City Council Receives Feasibility Report ..................................................................................... February 17, 2009
City Council Orders Improvements .................................................................................................. March 3, 2009
City Council Receives Plans and Specifications and
Authorizes Advertisement for Bidding ....................................................................................... April 21, 2009
Open Bids ........................................................................................................................................... May 12, 2009
City Council Awards Contract ............................................................................................................. May 19, 2009
Preconstruction Meeting .................................................................................................................... May 26, 2009
Begin Construction .................................................................................................................................. June 2009
Substantial Completion ............................................................................................................................. Fall 2009
Feasibility Report
Keegan Lake Drainage Improvements Update 2017
City Project No. ENG 0132
City of Rosemount, MN
WSB Project No. 2235-31 Page 14
7. F EASIBILITY AND RECOMMENDATION
This feasibility report consists of providing several emergency outlets to the landlocked stormwater basins
upstream of Keegan Lake. Outlet installation will provide flood prevention to adjacent properties and maintain
more defined shorelines for the ponds. Improvements include the installation of storm sewer and a weir at set
elevations to provide an emergency overflow for the landlocked stormwater basins. Installation of these outlets
will provide flood protection to adjacent properties while maximizing stormwater storage and will complete an
improvement identified as a goal in the SWMP. An alternative outlet option was analyzed for Basin 1521. This
outlet would connect into the storm sewer system along Bonaire Path to the south, rather than outlet to Basin
1465 to the north.
The alternate outlet for Basin 1521 would result in approximately 1’ less freeboard than the proposed SWMP plan
routing resulting in inadequate flood protection for adjacent structure.
A sanitary sewer stub is proposed to be extended north of 132nd Court to avoid future conflicts with the storm
sewer. Roadway repairs on 130th Street and 132nd Court as well as driveway repairs throughout the project are
proposed to accommodate the installation of storm sewer and sanitary sewer.
The total estimated cost of the Keegan Lake Drainage Improvements project is $476,400. The opinion of probable
cost can be found in Appendix B.
This project is feasible because there are no engineering factors to prevent the project from being completed. It is
also necessary and cost-effective from an engineering standpoint to maintain emergency outlet to each pond to
provide flood protection for the adjacent properties. It is our recommendation that the Keegan Lake Drainage
Improvements be implemented as outlined in this report.
Feasibility Report
Keegan Lake Drainage Improvements Update 2017
City Project No. ENG 0132
City of Rosemount, MN
WSB Project No. 2235-31
APPENDIX A
Figure 1 – Location Map
Figure 2 – Proposed Improvements
Figure 4 - KL-1521 Alternate Outlet
""""""" " """"""""""""""#*
#*
#*
#*
#*
#*Path: K:\02235-310\GIS\Maps\Figure 4 - KL-1521 Alt Outlet.mxd Date Saved: 2/3/2017 2:51:19 PMKeegan Lake Drainage ImprovementsFigure 4: Basin 1521 Alternative OutletRosemount, MN ±
Legend
Alternate Outlet
"Existing Storm Sewer
Basin Contours
0 225112.5 Feet
Pond 1521
Pond 1539
Pond 1540
Feasibility Report
Keegan Lake Drainage Improvements Update 2017
City Project No. ENG 0132
City of Rosemount, MN
WSB Project No. 2235-31
APPENDIX B
Opinion of Probable Cost
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Opinion of Probable Cost
WSB Project:Keegan Lake Drainage Improvements Design By:SH
Project Location:City of Rosemount Checked By:BA
City Project No.:ENG 0132
WSB Project No:2235-31 Date:1/19/2017
Item
No.
MN/DOT
Specification
No.
Description Unit
Estimated
Total
Quantity
Estimated
Unit Price Estimated Total Cost
A. SURFACE IMPROVEMENTS
1 2021.501 MOBILIZATION (5% MAX)LUMP SUM 1 $10,000.00 $10,000.00
2 2101.605 CLEARING AND GRUBBING ACRE 3 $3,000.00 $9,000.00
3 2104.505 REMOVE BITUMINOUS PAVEMENT SQ YD 175 $6.00 $1,050.00
4 2104.509 SALVAGE AND REINSTALL SIGN EACH 1 $100.00 $100.00
5 2104.513 SAWING BITUMINOUS PAVEMENT (FULL DEPTH)LIN FT 85 $3.00 $255.00
6 2104.601 RELOCATE SHED LUMP SUM 1 $2,500.00 $2,500.00
7 2104.501 REMOVE CURB AND GUTTER LIN FT 50 $12.00 $600.00
8 2531.501 CONCRETE CURB & GUTTER, DESIGN MODIFIED S LIN FT 50 $22.00 $1,100.00
9 2104.601 SALVAGE AND REINSTALL GUARDRAIL LUMP SUM 1 $2,500.00 $2,500.00
10 2104.601 SALVAGE AND REINSTALL LANDSCAPE STRUCTURES LUMP SUM 1 $1,000.00 $1,000.00
11 2105.501 COMMON EXCAVATION CU YD 200 $18.00 $3,600.00
12 2105.522 SELECT GRANULAR BORROW (CV)CU YD 150 $12.00 $1,800.00
13 2211.501 AGGREGATE BASE CLASS 5 (100% CRUSHED)TON 350 $18.00 $6,300.00
14 2350.501 TYPE LV 3 WEARING COURSE (C )TON 30 $62.00 $1,860.00
15 2350.502 TYPE LV 3 NON-WEARING COURSE (C )TON 30 $60.00 $1,800.00
16 2357.502 BITUMINOUS MATERIAL FOR TACK COAT GALLON 15 $3.50 $52.50
17 2563.601 TRAFFIC CONTROL LUMP SUM 1 $2,000.00 $2,000.00
18 2573.502 SILT FENCE, TYPE HEAVY DUTY LIN FT 4400 $1.50 $6,600.00
19 2573.602 INLET PROTECTION EACH 5 $200.00 $1,000.00
20 2575.501 SEEDING (INCL TOPSOIL, FERT, MULCH, DISC ANCHOR)ACRE 2 $1,500.00 $3,000.00
21 2575.502 SEED POUND 140 $5.00 $700.00
22 2575.523 EROSION CONTROL BLANKETS CATEGORY 3 SQ YD 7100 $2.00 $14,200.00
Subtotal Schedule A - Surface Improvements $71,017.50
+ 10% Contingencies $7,100.00
Subtotal $78,120.00
+ 30% Indirect Cost $23,440.00
Schedule A Total - Surface Improvements $101,600.00
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Opinion of Probable Cost
WSB Project:Keegan Lake Drainage Improvements Design By:SH
Project Location:City of Rosemount Checked By:BA
City Project No.:ENG 0132
WSB Project No:2235-31 Date:1/19/2017
Item
No.
MN/DOT
Specification
No.
Description Unit
Estimated
Total
Quantity
Estimated
Unit Price Estimated Total Cost
23 2104.501 REMOVE SEWER PIPE (SANITARY)LIN FT 40 $5.00 $200.00
24 2451.507 PIPE BEDDING MATERIAL TON 50 $10.00 $500.00
25 2503.602 CONNECT TO EXISTING MANHOLE EACH 1 $1,500.00 $1,500.00
26 2503.603 18" PVC PIPE SEWER - SDR 26 LIN FT 200 $45.00 $9,000.00
27 2503.603 TELEVISE SANITARY SEWER LIN FT 200 $2.00 $400.00
28 2506.516 CASTING ASSEMBLY EACH 1 $550.00 $550.00
29 2506.522 ADJUST FRAME & RING CASTING EACH 1 $250.00 $250.00
30 2506.603 CONST 48" DIA SAN SEWER MANHOLE LIN FT 15 $225.00 $3,375.00
Subtotal Schedule B - Sanitary Sewer Improvements $15,775.00
+ 10% Contingencies $1,580.00
Subtotal $17,360.00
+ 30% Indirect Cost $5,210.00
Schedule B Total - Sanitary Sewer Improvements $22,600.00
B. SANITARY SEWER IMPROVEMENTS
3 of 3K:\02235-310\Admin\Docs\Appendix B - OPC\Feasibility - Opinion of Probable Costs2017
Opinion of Probable Cost
WSB Project:Keegan Lake Drainage Improvements Design By:SH
Project Location:City of Rosemount Checked By:BA
City Project No.:ENG 0132
WSB Project No:2235-31 Date:1/19/2017
Item
No.
MN/DOT
Specification
No.
Description Unit
Estimated
Total
Quantity
Estimated
Unit Price Estimated Total Cost
31 2104.501 REMOVE SEWER PIPE (STORM) LF 120 $15.00 $1,800.00
32 2451.507 GRANULAR BEDDING CY 50 $25.00 $1,250.00
33 2501.515 15" RC PIPE APRON WITH TRASH GUARD EACH 2 $950.00 $1,900.00
34 2501.515 18" RC PIPE APRON WITH TRASH GUARD EACH 4 $1,200.00 $4,800.00
35 2501.515 30" RC PIPE APRON W/ TRASH GUARD AND PILING EACH 2 $4,500.00 $9,000.00
36 2501.601 WOODEN WEIR LUMP SUM 1 $2,500.00 $2,500.00
37 2503.541 15" RC PIPE SEWER DESIGN 3006 CLASS V LIN FT 480 $42.00 $20,160.00
38 2503.541 18" RC PIPE SEWER DESIGN 3006 CLASS IV LIN FT 130 $55.00 $7,150.00
39 2503.603 18" FUSIBLE PVC PIPE SEWER (DIRECTIONALLY DRILLED)LIN FT 415 $122.00 $50,630.00
40 2503.603 18" PVC PIPE SEWER (OPEN CUT)LIN FT 85 $45.00 $3,825.00
41 2503.603 36" STEEL CASING PIPE (OPEN CUT)LIN FT 50 $270.00 $13,500.00
42 2504.541 30" RC PIPE SEWER DESIGN 3006 CLASS III LIN FT 430 $112.00 $48,160.00
43 2506.501 CONSTRUCT DRAINAGE STRUCTURE DESIGN 48-4020 LIN FT 12 $300.00 $3,600.00
44 2506.501 CONSTRUCT DRAINAGE STRUCTURE DESIGN 60-4020 LIN FT 13 $425.00 $5,525.00
45 2506.501 CONSTRUCT DRIANAGE STRUCTURE DESIGN SPECIAL 3 EACH 1 $8,500.00 $8,500.00
46 2506.501 CONSTRUCT DRIANAGE STRUCTURE DESIGN SPECIAL 4 EACH 1 $8,500.00 $8,500.00
47 2506.501 CONSTRUCT DRIANAGE STRUCTURE DESIGN SPECIAL 5 EACH 1 $9,500.00 $9,500.00
48 2506.516 CASTING ASSEMBLY EACH 3 $660.00 $1,980.00
49 2511.501 RANDOM RIPRAP CL IV CU YD 50 $90.00 $4,500.00
50 2511.515 GEOTEXTILE FABRIC TYPE IV SQ YD 100 $5.00 $500.00
Subtotal Schedule C - Storm Sewer $207,280.00
+ 10% Contingencies $20,730.00
Subtotal $228,010.00
+ 30% Indirect Cost $68,400.00
Schedule C Total - Storm Sewer $296,400.00
Grand Total - Keegan Lake Drainage Improvements $420,600.00
C. STORM SEWER
Feasibility Report
Keegan Lake Drainage Improvements Update 2017
City Project No. ENG 0132
City of Rosemount, MN
WSB Project No. 2235-31
APPENDIX C
Figure 3 – Proposed Easement Requirements
Easement Tabulation
WSB Project:Keegan Lake Drainage Improvements Design By:
Project Location:City of Rosemount Checked By:
City Project No.:ENG 0132
WSB Project No:1668-14 Date:
Parcel
No.PID Total
Acreage
Total
Land
Value
Land Value
Per Foot
Permanent
Easement
(SQ FT)
Permanent
Easement
Cost
Temporary
Easement
Easement
(SQ FT)
Temporary
Easement
Easement
Cost
Total
Easement
Cost
1 34-02010-09-010 4.51 $110,300 $0.56 1680 $943 1935 $130 $1,074
2 34-02010-07-012 5.56 $164,600 $0.68 6070 $4,125 7953 $649 $4,774
3 34-02010-08-010 1.85 $130,800 $1.62 4431 $7,192 4496 $876 $8,068
4 34-02010-01-014 6.86 $190,400 $0.64 5510 $3,511 550 $42 $3,553
5 34-02010-03-012 9.36 $252,300 $0.62 ---$0 2166 $161 $161
6 34-01710-85-090 6.99 $121,800 $0.40 ---$0 445 $21 $21
7 34-01710-79-011 2.10 $79,600 $0.87 ---$0 160 $17 $17
8 34-01710-79-012 4.68 $13,000 $0.06 ---$0 ---$0 $0
9 34-02010-01-012 0.45 $100 $0.01 ---$0 ---$0 $0
10 34-02010-01-013 7.59 $207,700 $0.63 11973 $7,522 12387 $934 $8,455
11 34-02010-07-011 6.06 $225,400 $0.85 10539 $8,999 4178 $428 $9,427
12 34-44300-01-050 0.35 $8,800 $0.58 6,063 $3,500 ---$0 $3,500
46300 35,800 34300 3,300 $39,000
4630 $3,580 3430 $330 $3,900
50930 $39,380 37730 $3,630 $42,900
15280 $11,810 11320 $1,090 $12,870
66200 $51,200 49100 $4,700 $55,800
BA
2/3/2017
Reashmi & Roshan Lachhman
Owner
Michelle Lowney MacDonald
Jeffery & Deborah J Rohr
City of Rosemount
Justin Thompson
John A & Lori A Anderson
Justin Thompson
Randy P Kaiser
Christopher & Lisa Hadley
Subtotal
+ 10% Contingencies
Subtotal
+ 30% Indirect Cost
Total Easement Cost
Easement Tabulation
Lorraine M Gustafson
Daniel J & Mary J Kehoe
City of Rosemount