10-1-14.pdf; Flint Monthly Pumpage Comparison.pdf; ODWMA-399-022 pdf
Importance: High
Dear Governor, Dennis, and Val:
Per your request, the attached briefing paper is on the City of Flint drinking water situation. Director
Dan Wyant has asked that I send this to you. A Word version as well as a pdf version is
attached. We have also included a copy of the policy ODWMA-399-022 which specifically provides
guidance regarding boil water advisory situations, and a chart showing the significant increase in the
City of Flint’s water demands following the extreme conditions experienced this past winter.
Allison, please forward to the Governor. Thank you.
If you have any questions or need further information, please let us know, Thank you.
Mary Beth
Mary Beth Thelen
Management Assistant to Director Dan Wyant
Department of Environmental Quality
Constitution Hail, 6th Floor South
Phone: 517-284-6712 or 284-6700 (new numbers)
Fax: 517-241-7401
[email protected]
Attachments
xxxEND_PAGE:deq26_b114_1143_1162_01
DEPARTMENT OF ENVIRONMENTAL QUALITY
GOVERNOR’S OFFICE BRIEFING PAPER
CITY OF FLINT DRINKING WATER
What contributed to the Boil Water Advisories in the city of Flint?
A number of factors, not one specific cause, likely contributed to the Boil Water
Advisories (BWAs) in the city of Flint during August and September 2014. While use of
the Flint River has increased the amount of natural organic matter in the city’s water, the
Flint Water Treatment Plant (WTP) has performed well above treatment requirements
for organic carbon removal. In addition, less than 20 percent of the water system was
included in the advisory area. {f treatment had been compromised, detections would
have been widespread throughout the city, rather than in such a iocalized area.
The city’s water distribution system has suffered from a lack of infrastructure investment
and asset management. Most of the city’s over 550 miles of water mains are now over
75 years old and constructed of cast iron piping. Cast iron pipe is subject to internal
corrosion, called tuberculation, which causes buildup on the pipe interior, leading to
water quality issues, reduced flow and pressures, and leakage. Tuberculation also
encourages the development of biofilms, layers of bacteria that attach to the interior
pipe wall. Biofilm growth is common in areas of piping with little or no disinfectant
residual, and together with tuberculation can clog water lines to the point of insufficient
water pressure.
The city has aiso experienced decades of a declining user base and water use
associated with vacant homes, commercial businesses, and industrial property.
Declining water use leads to excess residence time within the city’s distribution pipes
and water storage facilities, accelerating tuberculation, biofilm growth, and disinfectant
residual degradation. While the city has recently seen an infusion of funding for blight
removal, contractors completing this work have been improperly using fire hydrants,
causing hydraulic disturbances that dislodged and suspended settled debris, which may
have contributed to the bacterial contamination.
The winter of 2014 was also one of the coldest experienced by the water system. The
city, which historically has unaccounted water losses of over 30 percent, has seen even
greater losses since February 2014 due to an increase in cold weather-related water
main breaks and leaks. The city lacks a formal maintenance program for its over 7,250
valves, which would normally be used to limit impacts during break repairs. Two valves
on the transmission line used to supply the area of the BWAs were found to be closed
during the city’s investigation, causing longer residence time, reduced disinfectant
residual, reduced flow, and reduced pressure. One of these valves has remained
broken.
xxxEND_PAGE:deq26_b114_1143_1162_02
Governor's Office Briefing Paper
City of Flint Drinking Water
Page 2
The BWAs also occurred during the warmest and, for 2014, relatively wet periods of
August and September. Warm weather conditions are not only more conducive to
bacterial growth but also degrade the water's disinfectant residual carried out from the
WTP more quickly. Longer residence times, biofilms, and tuberculation also contribute
to disinfectant residual degradation. Warm wet weather conditions also allow water
contaminated with bacteria to pool around piping with leaks and breaks.
Process for issuance and Cancelation of a Boil Water Advisory
There are a number of conditions that can trigger BWAs. This includes the following:
- Bacteria Monitoring Detections - Loss of System Pressure
- Bacteria Standards Violations - Water Main Breaks
~ Treatment System Failures - Other Interruptions in Service
- Waterborne Disease Outbreaks
The Department of Environmental Quality (DEQ) has developed a policy and procedure
regarding BWAs to help guide staff, provide consistency, and maintain public health. A
PDF of Policy and Procedure No. ODWMA-399-022 is being forwarded with this briefing
paper,
BWAs may be self-initiated by the water systern, issued collaboratively in consultation
with the DEQ, or when necessary mandated by the DEQ. Requesting customers to boil
the water when bacterial contamination has occurred provides an added barrier of
public health protection.
The BWAs that recently occurred in the city of Flint were associated with bacteria
monitoring detections and violations of bacteria standards. These advisories were
issued by the city of Flint collaboratively in consultation with the DEQ.
Current regulations regarding monitoring and standards for bacteria in water distribution
systems were developed by the U.S. Environmental Protection Agency, have been in
effect since 1990, and were incorporated into the Michigan Safe Drinking Water Act,
1976 PA 309, as amended. There are a variety of bacteria, parasites, and viruses that
can potentially cause heaith problems if humans ingest them in drinking water. Testing
water for each of these potential pathogens would be difficult and expensive. Instead,
water systems test for total coliform and E.coli. Total coliform bacteria react to water
treatment in a manner similar to many pathogens. Therefore, the presence of total
coliform in drinking water indicates there may be a pathway for pathogens or other
contaminants to enter the system. The absence of total coliforms in the distribution
system minimizes the likelihood that pathogens are present. E.coil/is itself a pathogen,
and its detection would be direct evidence of a health risk.
xxxEND_PAGE:deq26_b114_1143_1162_03
Governor's Office Briefing Paper
City of Flint Drinking Water
Page 3
Once a BWA has been issued, time is needed to investigate potential causes and
implement corrective measures. The larger the water system, the more time this may
take. Once corrective measures have been taken, samples must be collected and
analyzed to confirm that bacteria are no longer present. Using the most common
analytical method, sarnples must be incubated for a periad of 24 hours before results
can be obtained. In situations where the bacterial contamination has been confirmed,
two consecutive rounds of safe samples coilected at least 24 hours apart are normally
obtained before canceling a BWA. Adding each of these steps together, a normal
response period to cancel a BWA under these circumstances would be expected to take
at least 3 to 4 days.
Recent History of the City of Flint Water System
Historically, the city of Flint had been a customer of the Detroit Water and Sewerage
Department (DWSD) while simultaneously maintaining the Flint WTP to provide
emergency backup service using the Flint River. The WTP performed quarterly test
operations to maintain readiness and was utilized twice in 2009, supplying water once
for 2 days and the other for 3 days.
in April 2013 the city of Flint notified the DWSD that it would be terminating service in
the future and contracting for raw water service from the Karegnondi Water Authority
(KWA). Work on the KWA pipeline from Lake Huron broke ground in June 2013 and is
expected fo be completed with connection in late 2016.
In August 2013 Rowe Professional Services Company completed an engineering
proposal for improvements to the Flint WTP that would allow continuous operation of
the WTP utilizing the Flint River in lieu of continuing service frorn the DWSD until
completion of the KWA pipeline. In March 2014 the city of Flint entered into a Consent
Agreement with the DEQ regarding the Flint WTP’s lime sludge facility. In April 2014
the DEQ issued a construction permit for improvements to the Flint WTP. On April 25,
2014, the city of Flint began continuous operation of the WTP, using water from the Flint
River and discontinued the purchase of water from the DWSD.
A BWA was issued for August 15-20, 2014, for a portion of the city of Flint due to
localized detections of total coliform and E.colf bacteria. Another BWA was issued for
September 5-9, 2014, due to localized detections of total coliform bacteria in the same
and adjacent portions of the city of Flint. The advisory covered an area of
approximately six square miles. The city of Flint has a total land area of just over
34 square miles.
xxxEND_PAGE:deq26_b114_1143_1162_04
Governor's Office Briefing Paper
City of Flint Drinking Water
Page 4
While many of the BWA contributing factors listed above require long-term solutions, the
city has taken operational steps to limit the potential far a BWA to reaccur. The city has
increased flushing of water mains to limit residence time, maintain disinfectant residual,
and help remove buildup and deposits within the piping. The city is boosting chlorine
disinfectant residual at locations in the distribution system as needed. The city
continues to investigate water leaks and water main breaks and the status and condition
of system vaives.
Prepared by: Stephen Busch, P.E.
Lansing and Jackson District Supervisor
Office of Drinking Water and Municipal Assistance
Department of Environmental Quality
October 1, 2014
xxxEND_PAGE:deq26_b114_1143_1162_05
DEPARTMENT OF ENVIRONMENTAL QUALITY
GOVERNOR’S OFFICE BRIEFING PAPER
CITY OF FLINT DRINKING WATER
What contributed to the Boil Water Advisories in the city of Flint?
A number of factors, not one specific cause, likely contributed to the Boil Water
Advisories (BWAs) in the city of Flint during August and September 2014. While use of
the Flint River has increased the amount of natural organic matter in the city’s water, the
Flint Water Treatment Plant (WTP) has performed well above treatment requirements
for organic carbon removal. in addition, less than 20 percent of the water system was
included in the advisory area. If treatment had been compromised, detections would
have been widespread throughout the city, rather than in such a localized area.
The city’s water distribution system has suffered from a lack of infrastructure investment
and asset management. Most of the city’s over 550 miles of water mains are now over
75 years ald and constructed of cast iron piping. Cast iron pipe is subject to internal
corrosion, called tuberculation, which causes buildup on the pipe interior, leading to
water quality issues, reduced flow and pressures, and leakage. Tuberculation also
encourages the development of biofilms, layers of bacteria that attach to the interior
pipe wail. Biofilm growth is common in areas of piping with little or no disinfectant
residual, and together with tuberculation can clog water lines to the point of insufficient
water pressure.
The city has also experienced decades of a declining user base and water use
associated with vacant homes, commercial businesses, and industrial property.
Declining water use leads to excess residence time within the city’s distribution pipes
and water storage facilities, accelerating tuberculation, biofilm growth, and disinfectant
residual degradation. While the city has recently seen an infusion of funding for blight
removal, contractors completing this work have been improperly using fire hydrants,
causing hydraulic disturbances that dislodged and suspended settled debris, which may
have contributed to the bacterial contamination.
The winter of 2014 was also one of the coldest experienced by the water system. The
city, which historically has unaccounted water losses of over 30 percent, has seen even
greater losses since February 2014 due to an increase in cold weather-related water
main breaks and leaks. The city lacks a formal maintenance program for its over 7,250
valves, which would normaily be used to limit impacts during break repairs. Two valves
on the transmission line used to supply the area of the BWAs were found fo be closed
during the city’s investigation, causing longer residence time, reduced disinfectant
residual, reduced flow, and reduced pressure. One of these valves has remained
broken.
xxxEND_PAGE:deq26_b114_1143_1162_06
Governor's Office Briefing Paper
City of Flint Drinking Water
Page 2
The BWAs also occurred during the warmest and, for 2014, relatively wet periods of
August and September. Warm weather conditions are not only more conducive to
bacterial growth but also degrade the water's disinfectant residual carried out from the
WTP more quickly. Longer residence times, biofilms, and tuberculation also contribute
to disinfectant residual degradation. Warm wet weather conditions also allow water
contaminated with bacteria to pool around piping with leaks and breaks.
Process for issuance and Cancelation of a Boil Water Advisory
There are a number of conditions that can trigger BWAs. This includes the following:
- Bacteria Monitoring Detections - Loss of System Pressure
- Bacteria Standards Violations - Water Main Breaks
- Treatment System Failures - Other Interruptions in Service
- Waterborne Disease Outbreaks
The Department of Environmental Quality (DEQ) has developed a policy and procedure
regarding BWAs to help guide staff, provide consistency, and maintain public health. A
PDF of Policy and Procedure No. CDWMA-399-022 is being forwarded with this briefing
paper.
BWAs may be self-initiated by the water system, issued collaboratively in consultation
with the DEQ, or when necessary mandated by the DEQ. Requesting customers to boil
the water when bacterial contamination has occurred provides an added barrier of
public health protection.
The BWAs that recently occurred in the city of Flint were associated with bacteria
monitoring detections and violations of bacteria standards. These advisories were
issued by the city of Flint collaboratively in consultation with the DEQ.
Current regulations regarding monitoring and standards for bacteria in water distribution
systems were developed by the U.S. Environmental Protection Agency, have been in
effect since 1990, and were incorporated into the Michigan Safe Drinking Water Act,
1976 PA 399, as amended. There are a variety of bacteria, parasites, and viruses that
can potentially cause health problems if humans ingest them in drinking water. Testing
water for each of these potential pathogens would be difficult and expensive. Instead,
water systems test for total coliform and E.coli. Total coliform bacteria react to water
treatment in a manner similar to many pathogens. Therefore, the presence of total
coliform in drinking water indicates there may be a pathway for pathogens or other
contaminants to enter the system. The absence of fotal coliforms in the distribution
system minimizes the likelihood that pathogens are present. E.colfis itself a pathogen,
and its detection wauid be direct evidence of a health risk.
xxxEND_PAGE:deq26_b114_1143_1162_07
Governor's Office Briefing Paper
City of Flint Orinking Water
Page 3
Once a BWA has been issued, time is needed to investigate potential causes and
implement corrective measures. The larger the water system, the mare time this may
take. Once corrective measures have been taken, samples must be collected and
analyzed to confirm that bacteria are no longer present. Using the most common
analytical method, samples must be incubated for a period of 24 hours before results
can be obtained. In situations where the bacterial contamination has been confirmed,
two consecutive rounds of safe samples collected at least 24 hours apart are normally
obtained before canceling a BWA, Adding each of these steps together, a normal
response period to cancel a BWA under these circurnstances would be expected to take
at least 3 to 4 days.
Recent Histary of the City of Flint Water System
Historically, the city of Flint had been a customer of the Detroit Water and Sewerage
Department (DWSD) while simultaneously maintaining the Flint WTP to provide
emergency backup service using the Flint River. The WTP performed quarterly test
operations to maintain readiness and was utilized twice in 2009, supplying water once
for 2 days and the other for 3 days.
in April 2013 the city of Flint notified the DWSD that it would be terminating service in
the future and contracting for raw water service from the Karegnondi Water Authority
(KWA). Work on the KWA pipeline fromm Lake Huron broke ground in June 2013 and is
expected to be completed with connection in fate 2016.
in August 2013 Rowe Professional Services Company completed an engineering
proposal for improvements to the Flint WTP that would allow continuous operation of
the WTP utilizing the Flint River in lieu of continuing service from the DWS0D until
completion of the KWA pipeline. In March 2014 the city of Flint entered into a Consent
Agreement with the DEQ regarding the Flint WTP’s lime sludge facility. in April 2014
the DEQ issued a construction permit for improvements to the Flint WTP. On April 25,
2014, the city of Flint began continuous operation of the WTP, using water from the Flint
River and discontinued the purchase of water from the DWSD.
A BWA was issued for August 15-20, 2014, for a portion of the city of Flint due to
localized detections of total coliform and E.colf bacteria. Another BWA was issued for
September 5-9, 2074, due to localized detections of total coliform bacteria in the same
and adjacent portions of the city of Flint. The advisory covered an area of
approximately six square miles. The city of Flint has a total land area of just over
34 square miles.
xxxEND_PAGE:deq26_b114_1143_1162_08
Governor's Office Briefing Paper
City of Flint Drinking Water
Page 4
While many of the BWA contributing factors listed above require long-term solutions, the
city has taken operational steps to limit the potential for a BWA to reoccur. The city has
increased flushing of water mains to limit residence time, maintain disinfectant residual,
and help remove buildup and deposits within the piping. The city is boosting chlorine
disinfectant residual at locations in the distribution system as needed. The city
continues to investigate water leaks and water main breaks and the status and condition
of system valves.
Prepared by: Stephen Busch, P.E.
Lansing and Jackson District Supervisor
Office of Drinking Water and Municipal Assistance
Department of Environmental Quality
October 1, 2014
xxxEND_PAGE:deq26_b114_1143_1162_09
25,008,000
48,000,000 2018 |
Be | 2
=
8
8
10,000,000 -
8,000,000
xxxEND_PAGE:deq26_b114_1143_1162_10
Original Effective Date:
October 12, 2007
Revised Date:
Reformatted Date:
OFFICE OF DRINKING WATER
AND MUNICIPAL ASSISTANCE
POLICY AND PROCEDURE __