HomeMy WebLinkAbout7.b. Stormwater Pond Maintenance
EXECUTIVE SUMMARY
Utility Commission Meeting: January 25, 2021
AGENDA SECTION:
AGENDA ITEM: Stormwater Pond Maintenance Project
New Business
PREPARED BY: Brian Erickson, P.E. Director of Public Works
AGENDA NO. 7.b.
/ City Engineer
ATTACHMENTS: Project Plan Cover Sheet APPROVED BY: BLE
RECOMMENDED ACTION: None, informational only
BACKGROUND
Per the NPDES MS4 General Permit administered by the Minnesota Pollution Control Agency (MPCA),
the City is required to inspect every stormwater pond and outfall at least once per permit term and develop
a method to assess the effectiveness of all stormwater ponds for preventing/capturing pollution.
Inspections performed in 2015 and subsequent modeling indicated that pond 1935 (Broback Industrial
Park) and pond 0589 (Dawson CT) were operating at a low efficiency and maintenance was
recommended.
This project will excavate approximately 1640 cubic yards of accumulated sediment from pond 1935 and
1,285 cubic yards of accumulated sediment from pond 0589. An additional 520 cubic yards of soil will be
removed from upland areas of pond 1935 to reduce slope steepness as a safety precaution for equipment,
such as mowers, that accesses the site regularly for maintenance. Approximately, 1,985 cubic yards of the
sediment being removed have contaminant levels that require special disposal (e.g. not for use as fill in
residential areas or disposal at a landfill). Phosphorus removal efficiency is expected to improve by 12% in
pond 0589 and by 29% in pond 1935. Suspended solids removal is expected to improve by 15% in pond
0589 and by 43% in pond 1935. Additional benefits of the project include removal of voluntary trees for
better inspection and maintenance access and increased flood storage capacity.
The project was awarded by City Council on December 1, 2020 to Nadeau Companies in the amount of
$136,409.40 which was approximately $78,000 below the Engineer’s Estimate. This project will be funded
using the Storm Water Utility, and the engineer’s estimate of probable project cost was $214,250.00.
The contractor will begin work in late January 2021 and anticipates being completed by February 2021.
Final restoration will be performed in the spring. This project is the first in an anticipated annual program.
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K:\015819-000\Cad\Plan\015819-000-C-TITLE SHEET.dwg 11/10/2020 12:45:28 PMN
2020 ROSEMOUNT POND MAINTENANCE
CITY OF ROSEMOUNT
PROJECT LOCATION MAP
F/O
UGT
G
EXISTING PLAN SYMBOLS
PROPERTY LINES/RIGHT-OF-WAY
UTILITY EASEMENT
TREE LINE
SIGN
DECIDUOUS TREE
SHRUB
CONIFEROUS TREE
EXISTING UTILITY SYMBOLS
FIBER OPTIC CABLE
UNDERGROUND TELEPHONE
GAS LINE
CATV VAULT
POWER POLE
ELECTRIC BOX
CATCH BASIN
STORM APRON
CND
CTV
OH
UNDERGROUND CABLE
CABLE TV
OVERHEAD COMMUNICATIONS LINE
UGE
OHE
UNDERGROUND POWER
OVERHEAD POWER
UGEUNDERGROUND ELECTRIC
OHTOVERHEAD TELEPHONE
WATER MAIN
SANITARY SEWER
STORM SEWER
GATE VALVE
HYDRANT
SANITARY SEWER MANHOLE
STORM SEWER MANHOLE ST
s
COUNTY:DAKOTA
PROJECT LOCATION
THE SUBSURFACE UTILITY INFORMATION IN THIS PLAN IS UTILITY QUALITY LEVEL D. THIS UTILITY QUALITY LEVEL WAS DETERMINED ACCORDING TO THE
GUIDELINES OF CI/ASCE 38-02, ENTITLED "STANDARD GUIDELINES FOR THE COLLECTION AND DEPICTION OF EXISTING SUBSURFACE UTILITY DATA."
GOPHER ONE CALL TICKET NUMBER: 200841695
APPROVED BYSHEET NO.DATE
PLAN REVISIONS
ALL APPLICABLE FEDERAL, STATE, AND LOCAL LAWS AND ORDINANCES
WILL BE COMPLIED WITH IN THE CONSTRUCTION OF THIS PROJECT.
THIS PLAN SET CONTAINS 9 SHEETS
I HEREBY CERTIFY THAT THIS PLAN 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.
LICENSE NUMBER:DATE:11/10/2020 54301
WILLIAM C ALMS, P.E.
SHEET
9
OF
WSB PROJ. NO. 015819-000
PROJECT LOCATION
1
THIS PLAN SET HAS BEEN PREPARED FOR:
CITY OF ROSEMOUNT
2875 145TH STREET WEST
ROSEMOUNT, MN 55068-4997
(651) 423-4411
A CALL TO GOPHER STATE ONE (651-454-0002)
IS REQUIRED A MINIMUM OF 48 HOURS PRIOR
TO PERFORMING ANY EXCAVATION.
EXCAVATION NOTICE SYSTEM
PLAN SET INDEX
GOVERNING SPECIFICATIONS
UTILITY INFORMATION
THE 2015 CITY OF ROSEMOUNT GENERAL SPECIFICATIONS & STANDARD DETAIL
PLATES FOR STREET AND UTILITY CONSTRUCTION AND THE 2018 EDITION OF
THE MINNESOTA DEPARTMENT OF TRANSPORTATION "STANDARD
SPECIFICATIONS FOR CONSTRUCTION" SHALL GOVERN.
ALL TRAFFIC CONTROL DEVICES SHALL CONFORM TO THE LATEST EDITION OF
THE MINNESOTA MANUAL ON UNIFORM TRAFFIC CONTROL DEVICES, INCLUDING
THE LATEST FIELD MANUAL FOR TEMPORARY TRAFFIC CONTROL ZONE
LAYOUTS.
Sheet List Table
SHEET
NUMBER SHEET TITLE
1 TITLE SHEET
2 POND 1935 EXISTING CONDITIONS PLAN
3 POND 0589 EXISTING CONDITIONS PLAN
4 POND 1935 GRADING PLAN
5 POND 0589 GRADING PLAN
6 POND 1935 EROSION CONTROL AND
RESTORATION PLAN
7 POND 0589 EROSION CONTROL AND
RESTORATION PLAN
8 0589 EROSION CONTROL AND ACCESS PLAN
9 MISCELLANEOUS DETAILS
CITY PROJ. NO. 2021-02
BRIAN ERICKSON, P.E. - DIRECTOR OF PUBLIC WORKS / CITY ENGINEER DATE
145TH ST W
DIAMOND PATH WDAVENPORT AVEDAWSON CT