HomeMy WebLinkAbout08/01/2011 Work Session CITY OF COLUMBIA HEIGHTS Mayor
ca,y c. roersa„
Councilor embers
Robert A. 6Villiarns
590 40'" Avenue NE, Columbia Heights, MN 55421 -3878 (763)706 -3600 TDD (763) 706 -3692 Bruce Aawmck,
Visit our website at: www.eicolumbia-heightsann.us D u Diehm
Donna Schmitt
City Manager
Walter 12 l hst
ADMINISTRATION
NOTICE OF CITY COUNCIL MEETING
* * * * * * * * * * **
to be held in the
CITY OF COLUMBIA HEIGHTS
as follows:
Meeting of: COLUMBIA HEIGHTS CITY COUNCIL
Date of Meeting: AUGUST 1, 2011
Time of Meeting: 7:00 P.M. (or immediately following EDA meeting)
Location of Meeting: CONFERENCE ROOM 1
Purpose of Meeting: WORK SESSION
1. Authorization to seek bids for the replacement of the Argonne Sanitary Sewer Lift
Station
2. Municipal Service Center storm water management plan.
3. Personnel review discussion
The City of Columbia Heights does not discriminate on the basis of disability in the admission or access to,
or treatment or employment in, its services, programs, or activities. Upon request, accommodation will be
provided to allow individuals with disabilities to participate in all City of Columbia Heights' services,
programs, and activities. Auxiliary aids for handicapped persons are available upon request when the
request is made at least 96 hours in advance. Please call the City Clerk at 763 - 706 -3611 to make
arrangements. (TDD /706 -3692 for deaf or hearing impaired only)
CITY COUNCIL LETTER
Meeting of: August 1 2011
AGENDA SECTION: WORK SESSION ORIGINATING CITY MANAGER
NO: DEPARTMENT:
PUBLIC WORKS
ITEM: AUTHORIZATION TO SEEK BY: K. Hansen BY:
ENGINEERNG PROPOSALS FOR THE DATE: DATE:
ARGONNE SANITARY SEWER LIFT STATION
IMPROVEMENT
Background:
The sanitary sewer lift station located at 2330 Argonne is a `packaged' style duplex 5 hp vacuum pump type
system. The area serves just over 60 single family homes. It will be 30 years old next year and has now
exceeded its useful life. The location of the lift station is in the front yards of a residential area — including
the above ground pumping chamber housing and controls. The lift station has been experiencing an increase
in failures with both the mechanical and control components. Most important is that parts for the mechanical
system are becoming increasing difficult to obtain.
Analysis /Conclusions:
This area has had numerous power outages and although there is a generator hook up available on site, there
is not a standby generator. If lift station fails overflow would go into Tertiary Pond, which is surrounded by
private homes. During storm events, storm water runs down the curb line and enters the lift station wet well
access manhole and causes the wet well to surcharge.
Mechanically, we are getting to the point where it is more cost effective to replace the station than it is to
replace parts on old equipment. For example, we are currently replacing the motor starters at another lift
station because the cost of replacement is less than 1/2 of the cost of repair. Due to the age of the equipment,
troubleshooting is becoming more frequent making the cost of repairs more expensive. Night time and winter
repairs are difficult do to the style of lift station. Much of the repair work must be done while working out in
the elements.
Recommended Motion: Move to authorize staff to obtain engineering proposals from consultants for the
design, inspection and construction management of the Argonne Sanitary Sewer Lift Station Improvement.
COUNCIL ACTION:
CITY COUNCIL LETTER
Meeting of: August l 2011
AGENDA SECTION: WORK SESSION ORIGINATING CITY MANAGER
NO: DEPARTMENT:
PUBLIC WORKS
ITEM: MUNCIPAL SERVICE CENTER: BY: K. Hansen BY:
SURFACE WATER MANAGEMENT DATE: 7/28/11 DATE:
IMPROVEMENTS (Phase I)
Background:
In 2009, Public Works' staff had proposed to acquire an adjacent parcel to the rear yard located at 675 37`
Avenue the following municipal needs:
• Storm water ponding to meet NPDES Phase II requirements for construction and our
Municipal operations.
• Covered storage for mixed salt/sand storage (now stored in the open) — enough for one
season's use. City currently uses 700 ton per year average, salt.
• Materials storage such as for water main breaks excavations, asphalt, concrete, wood chips
and other Public Works excavations (currently being stored on other City owned land — City
Parks and formerly NEI).
• Materials / Excavations storage for the annual water main cleaning and lining project and
other construction projects.
• Snow storage for snow removal operations.
• Reserve Future Use (land lease or other)
The acquisition of this parcel was not approved by the council.
Analysis /Conclusions:
All cities with populations over 5,000 fall under the NPDES Program, administered by the MNPCA in the
State. Affected entities, referred to as Municipal Separate Storm Sewer Systems or MS4's are required to
hold permits regulated by the MNPCA. The first permit cycle was issued in 2003, and was then reissued due
to litigation involving the MNPCA in 2007. Currently, the MNPCA (Minnesota Pollution Control Agency) is
in the process of re- issuing the permit for the State. The permit gives the following rule in regards to
Pollution Prevention /Good Housekeeping for Municipal Operations (Part 3.E.6.a)
"Existing permittee's shall continue to develop and implement, and new permittee's
shall develop and implement, an operation and maintenance program designed to
prevent or reduce the discharge of pollutants from permittee owned and /or
operated facilities and operations. The operation and maintenance program shall
include, at a minimum, the following components:
COUNCIL ACTION:
CITY COUNCIL LETTER
Meeting of: August l 2011
AGENDA SECTION: WORK SESSION ORIGINATING CITY MANAGER
NO: DEPARTMENT:
PUBLIC WORKS
ITEM: MUNCIPAL SERVICE CENTER: BY: K. Hansen BY:
SURFACE WATER MANAGEMENT DATE: 7/28/11 DATE:
IMPROVEMENTS (Phase I)
a. Design and Implementation of BMPs
Where any facility or operation contributes pollutants to stormwater runoff, the
permittee shall, to the MEP, design and implement BMPs that eliminate
exposure of stormwater to potential pollutants. Where exposure cannot be
eliminated, the permittee shall develop and implement BMPs that divert, treat,
infiltrate, reuse, contain, or otherwise reduce pollutants in stormwater
discharges. The permittee shall base the design and implementation of BMPs
on the following factors:
(1) Typical urban pollutants and stormwater runoff characteristics that may
adversely affect downstream receiving waters that include, but may not be
limited to: sediment, nutrients, metals, hydrocarbons (e.g., benzene,
toluene, ethylbenzene and xylene), pesticides, chlorides, thermal impacts,
excessive stormwater volume and rate, trash, and bacteria."
BMP — Best Management Practices
MEP — Maximum Extent Practicalble
Most of the above possible pollutants are available in runoff from the cities' rear yard with the exception of
the runoff having thermal impacts. Currently the city lot has no BMP's that eliminate or minimize the
exposure to possible stormwater pollutants. In addition, it is not unconceivable that future rules could
establish numerical benchmarks for removal of pollutants. Having a structural BMP that the city can quantify
removal amounts is critical.
Stormwater ponding is a traditional and effective means, or BMP, of meeting the rule. Because the space to
build a pond is not available, another method to provide treatment will be needed:
Mechanical Structures as BMP: Three mechanical structures were looked into as possible BMP's to removal
pollutants from stormwater runoff. The three structures and there costs were as follows:
COUNCIL ACTION:
CITY COUNCIL LETTER
Meeting of: August l 2011
AGENDA SECTION: WORK SESSION ORIGINATING CITY MANAGER
NO: DEPARTMENT:
PUBLIC WORKS
ITEM: MUNCIPAL SERVICE CENTER: BY: K. Hansen BY:
SURFACE WATER MANAGEMENT DATE: 7/28/11 DATE:
IMPROVEMENTS (Phase I)
First Defense Unit — $17,000 — 20,000 +1-
Stromceptor - STC -2400 — $20,600
CDS Structure - $23,200
For comparison, the structures were sized to treat the runoff from a 1" rainfall event. All three units remove
roughly 80% of the TSS (Total Suspended Solids), which is a typical industry standard and meets the rule.
Public works recommends the Stormceptor, because maintenance is easier. Sediment collected in the
structures needs to be removed, a task that can be completed by city employees. The setup of the stormceptor
facilates an easier task. A study of mechanical structures performed by the University of Minnesota, showed
that the Stormceptor structure retains sediment and prevents re- suspension, as long the structure maximum
sediment storage are not exceded with regular maintenance.
To facilitate drainage to the Stormceptor unit, portions of the rear yard will need to be regraded along with
additional catch basins and storm sewer pipe. A washout area has also been included for the street sweepers
to filter out leaves and debris and drain through a newly created swale area. A site plan and cost estimate is
attached.
Funding:
Beginning in 2008, Public Works has available the on -site cell tower revenue, providing over $20,000 annually.
The Public Works 2011 budget has $65,000 programmed for this work in Capital Improvements.
Recommended Motion: Move to authorize the purchase of one Stormceptor unit, along with the storm
sewer and paving materials detailed above for the MSC Surface Water Management Improvements, up to the
budgeted amounts.
COUNCIL ACTION:
Estimated prices
No. Item Description Unit Quantity Unit Price Amount (A & 8) Amount (A only) Amount (B Only)
MSC Surface Water Improvements
Grading and Paving
1 Remove bituminous pavement Sq. Yd. 2,300 $1 .70 $3,910.00 53,910.00 $3,91000
2 Common excavation, CV - P Cu. Yd. 300 $7.90 52,370.00 52,370.00 $2,37000
Area A
3 Aggregate base class 5 or class 7, CV Cu. Yd. 120 $21.26 $2,551.20 52,551.20
4 Bituminous material for tack coat Gallon 23 $2.40 555.20 555.20
5 Type SP wearing course Ton 38 $63.50 $2,413.00 $2,413.00
6 Type SP non - wearing course Ton 38 $57.50 52,185.00 52,185.00
Area B
3 Aggregate base class 5 or class 7, CV Cu. Yd. 450 521.26 $9,567.00 59,567.00
4 Bituminous material for tack coat Gallon 90 52.40 5216.00 5216.00
5 Type SP wearing course Ton 150 $63.50 59,525.00 59,525.00
6 Type SP non - wearing course Ton 150 $57.50 58,625.00 $8,625.00
7 Concrete curb and gutter Lin. Ft. 115 59.50 $1,092.50' $1,092.50 $1,092.50
8 8" Concrete apron Sq. Ft. 700, 54.85 53,395.00 $3,395.00 53,395.00
Water
9 6" Gate valve and box including hydrant valve Each 1 51,500.00 $1,500.00 51,500.00 $1,500.00
10 Hydrant Each 1 53,000.00 53,000.00 53,000.00 53,000.00
11 6" DIP water main or hydrant lead, class 52 Lin. Ft. 200 530.00 56,000 00 56,000.00 56,000.00
Stormwater
11 12" RCP storm sewer, class V Lin- Ft. 150 $27.75 54,162.501 $4,162.50 $4,162.50
12 48" CB Type Y with casting Each 3 51,850.00 $5,550.001 55,550.00 55,550.00
13 Rain Gardians Each 2 5650.00 $1,300.00 51,300.00 $1.30000
14 Crane Rental Lump 1 $3,000.00 53,000.00 53,000.00 53,000.00
15 Mechnical Structure Each 1 520,600.00 $20,600.00 520,600.00 $20,600.00
$20,60000)
SUB -TOTAL BID 591,017.40 563,084401 583,813.00
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