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Minnesota
Pollution
Control
Agency
13
Background
Daily Loads
on Total Maximum
General Public # gp5.13 August 2008
water body is "impaired" or
polluted if it fails to meet one or
more water quality standards.
Federal standards exist for basic
pollutants such as sediment, bacteria,
nutrients and mercury. The Clean Water
Act (CWA) requires the Minnesota
Pollution Control Agency (MPCA) to
identify and restore impaired waters.
Minnesota's Impaired Waters list
(updated every two years) identifies
assessed waters that do not meet water
quality standards. The 2008 Impaired
Waters list contains 1,475 total
impairments on 336 rivers and 510 lakes.
Water quality assessments are complete
on a small percentage of Minnesota's
river miles and lakes.
What is a TMDL?
For each impairment on the list, the
CWA requires completion of a Total
Maximum Daily Load (TMDL).
The term "TMDL" describes both a
process and a number. The process
typically involves two to four years of
technical study and intensive stakeholder
and public input. The number is a
calculation of the maximum amount of a
pollutant the water body can receive and
still meet water quality standards.
A TMDL results in a pollution reduction
plan. The pollution reduction plan
identifies all the sources of the pollutant in
the watershed and allocates needed
reductions among them. The plan also
includes a margin of safety to account for
uncertainties in the calculations and
seasonal variability in water quality. In
addition, the plan may factor in a reserve
capacity to allow potential future
expansions in discharge.
Assess the state's waters
List those that do not meet standards
Identify sources and reductions needed
(TMDL study)
Implement restoration activities
(Implementation Plan)
Evaluate water quality
Related information Impaired waters
Background paper available on-line at:
http://www,pca. state. m n. us/newscenter/background.
html.
Minnesota's Impaired Waters list available at:
>~://www.pca.state.mn.us/water/tmdl/tmdl-
303dlist.html.
View the list of TMDL project underway in
Minnesota at:
http://www.pca. state.m n. us/water/tmdl/index. html#
rp oiects.
Minnesota Pollution Control Agency 520 Lafayette Rd. N., St. Paul, MN 55155-4194 www.pca.state.mn.us
651-296-6300 800-657-3864 TTY 651-282-5332 or 800-657-3864 Available in alternative formats
The TMDL Process
ly
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Minnesota
Pollution
Control
Agency
14a
Elk River Total Maximum Daily Load
(TMDL) Project
Elk River TMDL wq-iw8-14a February 2009
Impaired waters are those that do not
meet state water quality standards as set
forth in Minnesota Statute Chapter
7050. Common impairments are for
dissolved oxygen, nutrients, turbidity,
bacteria, or metals. Impaired water bodies
fail to meet criteria required to support
aquatic life, or allow the designated use of
a water body, such as swimming or fishing.
The Federal Clean Water Act requires the
Minnesota Pollution Control Agency
(MPCA) to identify impaired water bodies
and develop a total maximum daily load
(TMDL) for each parameter for which the
water body does not meet standards. The
TMDL is the total amount of a pollutant a
water body can take on while meeting the
established water quality standard(s).
Elk River TMDL Progress
In August 2008, the Elk River Watershed
Association (ERWSA) entered into a
contract with the MPCA to conduct TMDL
studies on Mayhew Lake (impaired for
nutrients), Big Elk Lake (impaired for
nutrients) and the Elk River from Big Elk
Lake to the St. Francis River (impaired for
turbidity and E. coli).
One of the first steps in the process was for
professionals from the ERWSA, Wenck
Inc., and the MPCA to complete a visual
survey of the Elk River and its tributaries.
This survey, completed in September 2008,
A TMDL study is typically developed
in four phases:
• Phase 1 -existing data is reviewed,
data gaps are identified, and plans
are developed to collect and
analyze the additional data needed
• Phase 2 -that additional data is
collected and evaluated
• Phase 3 -the TMDL is set. Loads
are allocated to point and non-
point sources and an
implementation plan to meet load
reductions is prepared
• Phase 4 -plans are implemented to
reduce loads to the limits set in
Phase 3, and to return the water
body to meet water quality
standards.
h~ ~>~ `.
e a ~ a
a ~P~~• ~,
Minnesota Pollution Control Agency 520 Lafayette Rd. N., St. Paul, MN 55155-4194 www.pca.state.mn.us
651-296-6300 800-657-3864 TTY 651-282-5332 or 800-657-3864 Available in alternative formats
Elk River at 73, looking east.
Tivu :9 a vu, to 11 a vu.
Locatiow: Meetiwg awd cLeawup Locatiows
wiiL be assigwed upow registratiow: sites
rawge iw Locatiow fro wt wear ~ole~, MN to
Ei~z Rlver, MN.
Who: This is a great activity for ever~owe
TOp 3 REASONS t0 help: 1.) YOU Will.
awd awu~owe iwciudiwg: Locai lade associa- get a warvu„ fuzz feel%wg awd
bows, school or church groups, bout awd sewse of accow~pl,ishvwewt. 2J You
girl scout troops to participate iw. wil.i help iw+.prove the ctual,it~ of
watev- b~ revwoviwg aii that trash!
RSVP b~ SeptevNber 4th to: s.) You will receive a Light breakfast
~~3-241-11~o ext. 3 ortif faN~detev- awd cawvas bag to covuvu.ew+.ovate
w~awCwNw.wacdwet.wet the evewt!
pate: septewtber 26th, 2ooy
2wd .4wwua~ E~~ t2.%ver watershed cl,eawup
peta Cls:
ow.saturda~ septew(ber 26th, 200 the Secowd ftwwual ~~~, River water-
shed cleawup is scheduled to take place. The cleave up will be~iw at9a.vw.
awd rove uwtil 22 a.wl. voluwteers will be assir~wed a wleetiwU place as well
as aw appropriate cleawup locatiow upow rer~istratiow. Cleawup sites will be
located alowr~ the river raw~iw~ frowt the wortherwportiows of the Eli, River
watershed iw gewtow couwt~ to the lower portiows o f the Eli River iw the
city o f EIV~ River. .411 voluwteers will vueet at thew assi~wed locatiow for a
light brea~Zfast awd a aiuicl2 sa fete wieetiwG. ~s a thaw~2-i~ou, all voluw-
teers will receive a reusable cawvas r~rocer~ bag.
This evewt is opew to everu~owe; althour~h childrew uwder 18 wi.ust be accowt.pa-
wied b~ aw adult.
Teavu~wg up to c~eawup! ~aa~a~E~o~,,
ERWSA ~v~<:
Elk River ~~
Watershed Association
Joint Powers Since 1994 w,,,,,Ego<.
C'rcy of
O. 1 ^~~ S_ H E RSB U R. T~ F ~~
\V~ K ~°A~~ River