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Pore Water Investigation Methods For Groundwater Discharges to Surface Water by Joseph Walczak Michigan DEQ, Superfund Section Prepared by Mark Henry Michigan DEQ
Transcript of Pore Water Investigation Methods For Groundwater ... › conf › nsas › Presentations ›...
Pore Water Investigation Methods For Groundwater Discharges to Surface Water
byJoseph Walczak
Michigan DEQ, Superfund Section
Prepared byMark HenryMichigan DEQ
What is pore water?
• Pore water is the water that takes up the space between particles in sediments
• Groundwater in an aquifer flows through sediments to the surface water and is “pore water” while migrating through the sediments
Why look at pore water ?
• Identify where, and at what strength contaminant plumes discharge to surface water bodies
• Quick and easy plume identification• Non-disruptive method using mini-piezometer
pore water samplers (PushPoint samplers)• Provide information for placement of permanent
(on land) monitoring wells• Provide valuable contaminant and geochemical
information about the plume discharge
Classic theory
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groundwater contamination
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Collect pore water in a transectparallel to shoreline, find the discharge,and then collect samples along axis
Sample in a grid pattern to define discharge
Push Point Sampler
Pore water sampling is quick and easy
Remove inner rodPush sampler into sediments
Collect pore water samples in a syringe or with a peristaltic pump
Determine the static water elevation relative to surface
water to determine if the location is in a groundwater
discharge area
Determine the static water level on dry land with miniature electronic WL meter
Using peristaltic pump and Myron meter to measure the Sp. Conductivity, pH, ORP,Temperature, TDS
Sample collection and preservation
PW Investigation Tools UtilizedDetermine the elevation of sampler & GPS the location
Treetop Auto-Level
Myron Ultrameter: pH, ORP, T, TDS, Sp. Cond.Chemetrics: DO, Fe++, NO3
-, Cr+6, etc.
Decontamination is easy
soap
DI water
Initial pore water sampling along creek course
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pc0 2
pc0 3
pc0 5
pc0 6
pc0 7
pc0 1 pc sw 01
pc0 4 pc sw 02
MW 32d
MW36 s, i, d
MW3 7 s,d
MW 29
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mw... .
MW3 8
MW 39
MW 26
MW 27
1.0 P FP -4736 0
171ND
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522 0
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981 .6 7
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981 .5 9
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981 .8 0
ND
ND
ND
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440
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161 0PF P- 5
PF P- 6
PF P- 7
PF P- 8
PF P- 9
pfp 21
2.0 P FP -10
PF P- 11
PF P- 12
PF P- 13
PF P- 14
PF P- 15
1.5 P FP -16
PF P- 17
PF P- 18
PF P- 19
PF P- 20
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PF P- 23PF P- 23
PF P- 24
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PC 20PC 21
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pc0 1 pc sw 01
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MW 32d
MW 36 s, i, d
MW3 7 s,d
MW 29
MW 28
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pc 12
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PF P- 18
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PF P- 20
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PF P- 23PF P- 23
PF P- 24
PF P- 2 PF P- 1
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ND ,55,820, 21 ND ,1 5
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#MW 43MW 41
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# Porewater samplin
# Initial PW sampling
Pore water samplinglocations define plume
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CREEK
CREEK
>5 mg/LCr+6
>1 mg/LCr+6
Cr+6 boundary> 400 ug/lPCE+TCE
>100 ug/LPCE+TCE
>200 ug/LPCE+TCE
PCE/ TC
E b oundary
10 0 10 20 30 40 50 Meters
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CreekCr+6 lowCr+6 highPCE/TCE lowPCE/TCE high
# Pore water sample
Zones of contaminant discharge at creek floodplain
Plume discharge seems to be following classical theory
Cr+6PCE
Underwater pore water collectionin the name of science….and fun
Conclusions• 70-90% savings over drilling or Geoprobe
investigation – 2 people PW sampling can define plume discharge in a couple of days
• PW sampling can collect a vast amount of geochemical data in a short time
• PW can determine if location is discharging or recharging
• PW sampling is fun – you really get to know your site
For more information: Joseph WalczakMDEQ [email protected] 335 2151
Mark HenryMDEQ [email protected] 335 3390
