HomeMy WebLinkAbout09/10/2012 Work Session CITY OF COLUMBIA HEIGHTS !Mayor
Gu,y L.Pctar.ran
Councilm embers
Robert 4. Williams
590 40`'Avenue NE,Columbia Heights,MN 55421-3878 (763)706-3600 TDD(763)706-3692 Bruce Nawrocki
Visit our website at:www.ci.columbia-hei;;hts.mn.us Tammero Dnehrn
Donna Schmitt
City Manager
Walter R.Fells(
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: MONDAY, SEPTEMBER 10, 2012
Time of Meeting: 6:30 PM
Location of Meeting: CONFERENCE ROOM 2
1. Sanitary Collection District 2 - Smoke Testing
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: -
AGENDA SECTION: Work session discussion ORIGINATING DEPARTMENT: CITY MANAGER
NO: PUBLIC WORKS
ITEM: Sanitary Sewer Collection District 2: I/I Update BY: K.Hansen BY:
and Smoke Testing DATE: DATE:
Background:
The MCES 5-year I/I Reduction Program ends in 2012. The City of Columbia Heights was surcharged on our
sanitary sewer bill to Metropolitan Council Environmental Services(MCES)in the amount of$81,900,annually.
This surcharge is for non-sewage flow from inflow or infiltration(UI) sources in sewer collection district 2.We
were successful in reducing this to zero, or offset, by eligible expenditures the City makes in I/I reduction
measures annually.An example of this is the sump pump disconnect program,sanitary sewer lining and manhole
replacements.
While UI flows have been reduced,peak exceedances continue Metro wide. Therefore the MCES is
transitioning the I/I reduction Program to an"On-going Program" for the Metro Area. Consequently, the
surcharges will be recalculated under this program. See the attached letter from the MCES dated September
13th, 2011.
Analysis/Conclusions:
Peak exceedance is still occurring at the MCES meter located at 37th Avenue and 5th Street from collection
district 2.When the sump pump disconnect program was initiated in 2007,it was known that it may only be
a first step in reducing clear water sources and that additional reduction measures may be required depending
on source types of inflow or infiltration (such as foundation drains).
To further evaluate and better define potential inflow sources, flow testing was conducted in District 2 in
smaller tributary areas or sub-collection districts. The monitoring found that in 2 of the 5 sub-districts (5th
Street meter-shed (2A) and Jefferson Street meter-shed (2B)) showed a directly related increase in flow to
rainfall events. The meter data provided that the buildup in flow was gradual, which would indicate
foundation drain connections.The report recommended that these lines be televised with a day or two after a
rainfall event to corroborate increased (from dry weather) flows from services.
In 2011, staff televised the sewer lines immediately following rainfall events. Several services have been
shown with a continuous stream of clear water, further supporting the foundation drain connections.
Following the extensive sewer lining program in 2011/12 and manhole replacements in the Street Rehab
Zone, staff again conducted flow testing. While the public system has now been addressed in Collection
District 2,private source inflow was confirmed.
Staff recommends additional testing in this area by smoke testing the two sub-districts followed by
televising those service lines found to be continuous draining. Smoke testing is a quick and efficient way to
identify inflow sources(multiple)that lead to peak surcharges in the sanitary system(see attached diagram).
Examples of these include:
• Private service lines
• Illegal connections to the private sanitary sewer service such as:
o Foundation drains
o Gutter downspouts
oYard drains
oInterior building drains
•
2/ Metropolitan Council
44
September 13,2011 Environmental Services
Kevin Hanson
Public Works Director
City of Columbia Heights
590-40th Ave.NE
Columbia Heights,MN 55421-3835 - =' „
RE: Excessive Wastewater Peak Discharges bLt 2011
For period between July 1,2010 through August 31,2011 WORKS
Dear Mr.Hanson:
The Metropolitan Council adopted an I/I Surcharge Program in February 2006,which placed a surcharge on a
community's municipal wastewater charge when a community exceeded their I/I Goal(maximum hourly discharge
limit). The I/I program monitoring end-date under this initial program was June 30,2010.
In 2009 the Council formed a Demand Charge Task Force to address the long term impacts of excessive I/I on the
regional disposal system.Consistent with the recommendations of the Demand Charge Task Force,the Council will
implement an On-going I/1 mitigation program in 2013. The start date for peak flow exceedance measurement for
the on-going will be January 1,2012. Therefore,any exceedances measured between July 1,2010 and December
30, 2011 will not result in any mandatory mitigation plan under the on-going I/I program.
This notification of excessive peak flow discharge(s)is for informational purposes only.No response from
your community is required.
Attached is a copy of a flow chart(s)for the subject event(s). Your community, either in part or in entirety,
exceeded the I/I limit,as defined under the initial I/I program,during these events. You may have received this
information previously though other informal communications.
It is also important to note that the hourly discharge limits under the"on-going"program will be re-calculated
according to the recommendations of the Demand Charge Task force. The limits illustrated in the attached charts do
not reflect the limits that will be used to assigned excessive peak flows for events occurring after January 1,2012.
Maximum limits as defined under the on-going I/I program will be forwarded to your community later this year.
For additional information regarding the CounciI's On-going I/I program, go to our web site at:
http://www.metrocouncil.org/environment/Prof ectTeams/documentsinm
If you have any questions regarding the attached chart,the Council On-going I/I program,or data that the MCES
may have regarding your community's flow discharges to the MDS,please do not hesitate to call me at
(651)602-1151.
Sincerely,
Ky L.Colvin,PE
Assistant Manager,MCES Engineering Services Group
Enclosure(s)
cc: Bill Cook,Manager,MCES Engineering Services Group
www.metrocouncil.org
390 Robert Street North • St.Paul,MN 55101-1805 • (651) 602-1005 • Fax(651) 602-1477 • TTY(651)291-0904
An Equal Opportunity Employer
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SMOKE TESTING SEWER LINES
What is the benefit to the city for performing a Smoke Test?
Smoke Testing is used to identify sections of sewers which may exhibit inflow during rainfall. Inflow
sources are roof leaders, cellars, yard and area drains, foundation drains, abandoned building
sewers, faulty connections, illegal connections, and storm water drainage system cross
connections. It can also detect structural damages and leaking joints in sewer pipes and overflow
points in sewer systems.
What exactly is a Smoke Test?
A two/three-man crew places a smoke blower over manholes and smoke is blown through the
sewer system.Anywhere the smoke exits, there is potential for stormwater to enter the sewer
system.
How will residents know when Smoke Testing will be performed in their neighborhoods?
Door hangers will be placed on the front door of every building on the streets to be smoke tested
at least 24 to 48 hours in advance. Notices will be distributed by the smoke testing field crew.
How are the smoke test crews recognizable in the field?
All field personnel are uniformed and carry identification badges. Crew members operate from
vehicles with company signage.
Is the smoke hazardous?
NO! The smoke that comes out of the vent stacks on houses or holes in the ground is non-toxic,
harmless, and has no odor. It does not create a fire hazard.
Do residents have to do anything to prepare their homes for Smoke Testing?
One gallon of water should be poured into the drain traps of floors, sinks, showers, and tubs to
prevent sewer gases from entering the building to prevent smoke from entering the home. If
smoke does enter, the resident should consult a licensed plumber. If harmless smoke can enter
through faulty plumbing, the potential exists for dangerous sewer gases to also enter the home.
What if smoke comes out of a resident's yard or driveway?
This could mean that there a drain on the property which is connected to the house sewer line
instead of the storm system. It could also mean that there is not direct connection, but that the
lateral has breaks or cracks in the pipe that drain runoff after it has entered into the soil.
If there is smoke in the resident's yard,does that mean the cause of the leak needs to be
dug up?
In a worst-case scenario, yes, but there are many other solutions, such as disconnecting the drain
or lining a portion of the house lateral without an excavation.
Does the resident need to be home when the Smoke Testing is performed?
Homeowners do not need to be home and field crews will not need to enter the residence. Field
crews will record the testing, taking photos and measuring distances so the defects can be located.
NI 0 IT I C El
SMOKE TESTING SEWER LINES
The City of Columbia Heights is conducting a smoke test
of its sanitary sewer system.
Work crews will be in town starting on .
A "SMOKE TEST" survey will assist our inspection crews in locating breaks and
defects in our sewer system. The smoke you see coming from the vent stacks on
houses or holes in the ground is NON-TOXIC, NON-STAINING, HAS NO ODOR,
WHITE TO GRAY IN COLOR AND CREATES NO FIRE HAZARD.
The smoke should not enter your home unless you have defective plumbing or dried
up drain traps.
It is advisable for the home owner to pour a gallon of water into each drain trap of
floors, sinks, showers, and tubs prior to our testing. If smoke enters your home
there is a good reason to assume that sewer gases may also be entering your home
or business. If you are not home and discover smoke when you return, please call
us at 763 706-3700.
IMPORTANT! If there is any individual in your home or business who has
respiratory problems and is immobile, please notify us at 763 706-3700 prior
to testing.
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