Transcript
Page 1: A Simplified Microscopic Particulate Analysis for use in ... MPA.pdf · A Simplified Microscopic Particulate Analysis for use in GARP Determination Peter Wallis1, Chelton van Geloven2,

A Simplified Microscopic Particulate Analysis for use in GARP

Determination

Peter Wallis1, Chelton van Geloven2, Dave Tamblyn3 and Catherine Henry4

1. Hyperion Research Ltd., 1008 Allowance Ave. SE, Medicine Hat, AB T1A 3G82. Ministry of Forests, Lands and Natural Resource Operations, 499 George St., Prince George, BC V2L 1R53. Northern Health, 299 Victoria St., Prince George, BC V2L 5B84. Catherine Henry Environmental Consulting, 2017 Willowview Dr., Dawson Creek, BC V1G 2S6

Page 2: A Simplified Microscopic Particulate Analysis for use in ... MPA.pdf · A Simplified Microscopic Particulate Analysis for use in GARP Determination Peter Wallis1, Chelton van Geloven2,

BACKGROUND: Filtering More Water Does Not Affect Risk Prediction

Page 3: A Simplified Microscopic Particulate Analysis for use in ... MPA.pdf · A Simplified Microscopic Particulate Analysis for use in GARP Determination Peter Wallis1, Chelton van Geloven2,

MPA-1623: Better Filtration & Elution Technology Saves Field Time and Improves Results

Low Risk

Medium Risk

High Risk

Page 4: A Simplified Microscopic Particulate Analysis for use in ... MPA.pdf · A Simplified Microscopic Particulate Analysis for use in GARP Determination Peter Wallis1, Chelton van Geloven2,

Project Objectives

Test the idea that MPA risk can be estimated from a small, grab sample at Level 2 in a GARP determinationEvaluate the contribution of turbidity to riskCan MPA risk be correlated with geochemical measurements in the field or bacteriology?

Page 5: A Simplified Microscopic Particulate Analysis for use in ... MPA.pdf · A Simplified Microscopic Particulate Analysis for use in GARP Determination Peter Wallis1, Chelton van Geloven2,

Results from Wells & Springs

Springs WellsPredicted Risk Developed Undeveloped Drilled Wells Dug WellsLow 5 9 1* 0

Medium 6 4 8 0

High 9 2 66 2

* Hair, probably rodent, was found in this well!

Page 6: A Simplified Microscopic Particulate Analysis for use in ... MPA.pdf · A Simplified Microscopic Particulate Analysis for use in GARP Determination Peter Wallis1, Chelton van Geloven2,

What we See Under the Microscope: - Iron, Silica and Clay Minerals

Page 7: A Simplified Microscopic Particulate Analysis for use in ... MPA.pdf · A Simplified Microscopic Particulate Analysis for use in GARP Determination Peter Wallis1, Chelton van Geloven2,

- Diatoms

Page 8: A Simplified Microscopic Particulate Analysis for use in ... MPA.pdf · A Simplified Microscopic Particulate Analysis for use in GARP Determination Peter Wallis1, Chelton van Geloven2,

- Other Algae

Page 9: A Simplified Microscopic Particulate Analysis for use in ... MPA.pdf · A Simplified Microscopic Particulate Analysis for use in GARP Determination Peter Wallis1, Chelton van Geloven2,

- Other Interesting Objects

Page 10: A Simplified Microscopic Particulate Analysis for use in ... MPA.pdf · A Simplified Microscopic Particulate Analysis for use in GARP Determination Peter Wallis1, Chelton van Geloven2,

- Plant Debris

Page 11: A Simplified Microscopic Particulate Analysis for use in ... MPA.pdf · A Simplified Microscopic Particulate Analysis for use in GARP Determination Peter Wallis1, Chelton van Geloven2,

- Rotifers

Rotifer https://youtu.be/eVyTJdFifEI

Page 12: A Simplified Microscopic Particulate Analysis for use in ... MPA.pdf · A Simplified Microscopic Particulate Analysis for use in GARP Determination Peter Wallis1, Chelton van Geloven2,

Turbidity is not closely related to Total Coliforms, E. coli, TOC or TSS

Esch

eric

hia

coli

(MPN

/100

mL)

0

125

250

375

500

Field Turbidity (NTU)

2 5 8 10 13

HighMediumLow

Risk Prediction

Tota

l Col

iform

s (M

PN/1

00 m

L)

0

750

1500

2250

3000

Field Turbidity (NTU)

2 5 8 10 13

HighMediumLow

Risk Prediction

Tota

l Sus

pend

ed S

olid

s (m

g/L)

0

5.5

11

16.5

22

Field Turbidity (NTU)

0 20 40 60 80

HighMediumLow

Risk Prediction

Tota

l Org

anic

Car

bon

(mg/

L)

0

2

4

6

8

Field Turbidity (NTU)

0 20 40 60 80

HighMediumLow

Risk Prediction

Page 13: A Simplified Microscopic Particulate Analysis for use in ... MPA.pdf · A Simplified Microscopic Particulate Analysis for use in GARP Determination Peter Wallis1, Chelton van Geloven2,

But Any E. coli or High Total Coliforms Were Associated with Higher Risk

Esch

eric

hia

coli

(MPN

/100

mL)

0

125

250

375

500

Total Coliforms (MPN/100 mL)

0 625 1250 1875 2500

HighMediumLow

Page 14: A Simplified Microscopic Particulate Analysis for use in ... MPA.pdf · A Simplified Microscopic Particulate Analysis for use in GARP Determination Peter Wallis1, Chelton van Geloven2,

Turbidity and Redox Potential (ORP) are Associated with Risk

Red

ox (

mV

)

-180

-60

60

180

300

Turbidity (NTU)

2 5 8 10 13

High MediumLow

2 variable model: Risk = f (Turb, ORP) Risk = m₁ · Turb + m₂ · ORP + εTurb ORP

slope (m) 0.022 0.0007SE(m) 0.009 0.0006t = m / SE 2.41 1.19p-value 0.009 0.118statistical significance ** nscoeff of determination (r²) 6.6%

Page 15: A Simplified Microscopic Particulate Analysis for use in ... MPA.pdf · A Simplified Microscopic Particulate Analysis for use in GARP Determination Peter Wallis1, Chelton van Geloven2,

Conclusions

If surface water organisms can be detected in 2L of water, it’s GARPFiltering large volumes of water does not make an MPA test more sensitive Turbidity and TSS alone are not good GARP indicators unless combined with ORPWells with positive ORP, especially springs, are more likely to contain surface water organisms

Page 16: A Simplified Microscopic Particulate Analysis for use in ... MPA.pdf · A Simplified Microscopic Particulate Analysis for use in GARP Determination Peter Wallis1, Chelton van Geloven2,

Questions?

www.hyperionlab.ca


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