Mn 9 Fact Sheet

8/2/2019 Mn 9 Fact Sheet

http://slidepdf.com/reader/full/mn-9-fact-sheet 1/28



Assessment Point: MN-9

The following data are excerpts from multiple reports. While the same location in theMenomonee River watershed is represented, the assessment point IDs differ. Throughout

the following data, Assessment Point MN-9 is also represented by:

o Reach 848

o RI-21

o Menomonee River Downstream of Butler Ditch

o 127th

Street Extended



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C ED A R B UR G CE D A R B U R G

C it y of C i t y o f

ME Q UO N M EQ UO N

UPPER MENOMONEE RIVER

LI T TLE MENO M O N E E RIVER

LILLY CREEK

WILLO W C R E EK NOR-X-WAY CHANNEL

WEST BR ANCH MENOMO N E E RIV E R

NORTH BRANCH MENOMONEE RIVER

LITTLE MENOMONEE CREEK



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UPPER MENOMONEE RIVER

LI T TLE MENO M O N E E RIVER

LILLY CREEK

WILLO W C R E EK NOR-X-WAY CHANNEL

WEST BR ANCH MENOMO N E E RIV E R

NORTH BRANCH MENOMONEE RIVER

LITTLE MENOMONEE CREEK



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M E Q U O N M E Q U O N



MN-11

MN-9

MN-2

MN-5

MN-4

MN-7

MN-3

MN-6

MN-1

MN-10

MN-12

MN-8 MN-9

MN-7

MN-6

MN-5

MN-4

MN-3 MN-2

MN-1

MN-11

MN-12

MN-10



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Constituent Measure Standard/Target

Geometric Mean Standard 200 counts/100 ml

Not to Exceed Standard 400 counts/100 ml

Dissolved Oxygen (DO) Minimum Concentration Standard 5 mg/l

Total Suspended Solids (TSS)

USGS Median TSS Reference Concentration (estimated

background concentration) 17.2 mg/l

Total Phosphorus (TP) Planning Guideline 0.1 mg/l

Flashiness

Richards Baker Flashiness Index (quantifies the frequencyand rapidity of short-term changes in stream flow; the index

ranges from 0 - 2, with 0 being constant flow) indicator only

Menomonee River Standards/Targets

Fecal Coliform





Figure Overall Project

Team Assessment

Analysis

Chloride by flow(Cl not from

models)

Inconclusive (nowinter data)

It is difficult to assess chloride without data from the winter months; however, the data sugg

the chloride concentration.

Dissolved oxygen

by flow

Good Note the decline in dissolved oxygen concentration at low flows. This is likely due to a com

agitation and higher temperatures (low flow conditions are often associated with the warm su

Fecal coliform by

flow

Poor Generally, a pollutant that is present at high concentrations during high flows and low conce

(fecal coliform, in this case) is attributed primarily to non-point sources. The infrequent sew

years) would only contribute during the high flows when substantial non-point loads are alre

periods with the highest flows, fecal coliform counts exceed the regulatory standard more th

low flows, the standard is met more than 75% of the time. This would be the safest time for swimming, wading, etc.).

Phosphorus by

flow

Moderate to Poor Concentrations of phosphorus are greatest at high and low flows. This suggests a backgroun

noticeable during low flows (perhaps from non-contact cooling water) as well as non-point l

medium and high flows.

Suspended solids

by flow

Good The concentrations of suspended solids increase with increased flows, suggesting contributio

The suspended solids may come from runoff that carries a sediment load, from stream bank

stream sediments.



Flashiness Index

Reach Description Richards Baker Flashiness Index

RI-21 127th

Street Ext. 0.42

Average Daily Flow

127th Street Ext. (848)

200

400

600

800

1000

1200

A V E R A

G E D A I L Y F L O W (

C F

S



Existing Water Quality Data

AssessmentPoint

Water QualityIndicator

Statistic ConditionExisting

Mean (cells per 100 ml) 2,828Fecal Coliform Bacteria(annual)

Percent compliance with single samplestandard (<400 cells per 100 ml)

57

MN-9Menomonee River

Downstream of Butler Ditch

Geometric mean (cells per 100 ml) 489

Days of compliance with geometric meanstandard (<200 cells per 100 ml)

72

Mean (cells per 100 ml) 1,571Fecal Coliform Bacteria(May-September: 153days total) Percent compliance with single sample

standard (<400 cells per 100 ml)76

Geometric mean (cells per 100 ml) 229

Days of compliance with geometric meanstandard (<200 cells per 100 ml)

51

Dissolved Oxygen Mean (mg/l) 10.8

Median (mg/l) 11

Percent compliance with dissolved oxygenstandard (>5 mg/l)

99

Total Phosphorus Mean (mg/l) 0.101

Median (mg/l) 0.061

Percent compliance with recommendedphosphorus standard (0.1 mg/l)

69

Total Nitrogen Mean (mg/l) 1.08

Median (mg/l) 1

Total Suspended Solids Mean (mg/l) 15.7



40

80

120

160

200

240

280

320

360

400

A v e r a g e N u

m b e r o f D a y s P e r Y e a r

Menomonee River @ 127th Street Ext (RI 21)




0

40

80

120

160

200

240

280

320

360

400

0 -4 0

4 0 0 -

6 0 0 -

1 0 0 0

2 0 0 0

3 0 0 0

4 0 0 0

5 0 0

A v e r a g e

N u m b e r o f D a y s P e r Y e a r




0

40

80

120

160

200

240

280

320

360

400

0 - 0 . 0 5

0 . 0 5 - 0 .

0 .1 - 0 .1

0 .1 5 - 0 .

0 .2 - 0 .2

0 .2 5 - 0 .

0 . 3 - 0 . 3

0 . 3 5 - 0 .

0 .4 - 0 .4

0 .4 5 - 0 .

A v e r a

g e N u m b e r o f D a y s P e r Y e

a r




0

40

80

120

160

200

240

280

320

360

400

A v e r a g e N u m b e r o f D a y s P e r Y e a r













10

100

1000

C o n c e n t r a

t i o n ( m g / L )

Flow Conditions Acute Toxicity (757 mg/L) Chronic Toxicity (395 mg/L) Box & Whis

127th Street Ext. (RI-21) – Reach 848Chloride

Dry C on d iti ons

M id -ra nge F lo ws

Hig h F lo ws

Mo ist C on d iti ons



10

100

C o n c e n t r a

t i o n ( m g / L )

Flow Conditions Regulatory Standard (5 mg/L) Box & Whiskers

127th Street Ext. (RI-21) – Reach 848Dissolved Oxygen

D ry C on d iti on s

M id - ra nge F lo ws

Hig h F lo ws




1.E+01

1.E+02

1.E+03

1.E+04

1.E+05

C o n c e n t r a t i o n ( c f u / 1 0 0 m L )

Flow Conditions Regulatory Standard (400 cfu/100 mL) Box & Whiske

127th Street Ext. (RI-21) – Reach 848Fecal Coliform

D ry C on diti on s

Mid - ra n ge F lows

H ig h F lows

M o ist Con diti on s



0.10

1.00

C o n c e n t r a

t i o n ( m g / L )

Flow Conditions Planning Standard (0.1 mg/L) Box & Whiskers

127th Street Ext. (RI-21) – Reach 848Total Phosphorus



Hig h F lo ws




10

100

1000

C o n c e n t r a

t i o n ( m g / L )

Flow Conditions Reference Concentration (17.2 mg/L) Box & Whiskers

127th Street Ext. (RI-21) – Reach 848Total Suspended Solids



Hig h F lo ws






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Mn 9 Fact Sheet