2013-03-01 peak field parameters presentation
TRANSCRIPT
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Groundwater Sampling
Field ParametersKassidy Klink
Peak Environmental
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Acceptable Groundwater Sampling Methods
Volume-Average Purge
SamplingLow-flow Sampling
Non-purge Sampling
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Important Points to Consider
Well screen >5ˈ = multiple samples
Firms need to be certified
Field calibration at correct temperature
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Calibration Form
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Applicable Field Parameters
pH
SC
ORP
DO
NTU
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What is pH?
A measure of how acidic/basic water is; Ranges from 0-14, with 7 being neutral Reported in logarithmic units (ex. pH of 5 is 10x
more acidic than 6)
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Why measure pH pH of water determines solubility and biological
availability of chemical constituents Nutrients (phosphorus, nitrogen, and carbon) Heavy metals (lead, copper, cadmium, etc.) pH determines activity of organisms and there
ability to use nutrients pH determines toxicity of heavy metals Generally more toxic at lower pH (solubility)
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What is Specific Conductivity? The measure of the ability of water to conduct
electrical current Conductivity + area of electrodes = SC Highly dependent on the amount of dissolved
solids (such as salt) in water A good indicator of the amount of dissolved
material in water
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Why measure Specific Conductivity
Dissolved solids can affect the suitability of water for domestic, industrial, and agricultural uses
Can give drinking water unpleasant taste or odor Can cause gastrointestinal problems Can deteriorate plumbing fixtures and appliances Saline water can affect crops Very high levels can inhibit bacterial activity
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What is ORP?
Oxidation → net loss of electrons, Reduction → net gain of electrons
A measure of the tendency of a chemical substance to oxidize or reduce another chemical substance
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Why measure ORP Under proper ORP conditions, contaminants can
transform and/or become immobilized (ex. Heavy metals)
Cr+6 → Cr+3 under reducing conditions (good) As+5 → As+3 under reducing conditions (bad) Chlorinated solvents: Dechlorination (reducing
conditions) or ISCO (oxidizing conditions) Dechlorination of chlorinated compounds occurs
as a stepwise process with each step requiring a lower ORP
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What is and why measure Dissolved Oxygen?
Oxygen dissolved in water Typical Range → 0 to 8 mg/L Indicates whether conditions are: Oxidizing (aerobic) Reducing (anaerobic) Oxygen is the first electron acceptor available for
biotic transformations and is quickly consumed If DO is low (<2 mg/L) – look at other electron
acceptors
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What is and why measure Turbidity
The amount of particulate matter (i.e. clay, silt, organic matter, microscopic organisms) suspended in water
High turbidity in samples can influence analytical results
Organics/inorganics sorbed to particulates Suspended inorganics
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What is and why measure Temperature
Can vary with: Depth Seasons Impacts biological activity Colder = slower Impacts probe calibrations
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Wrap-up Field parameters are actually important
o Geochemistry of siteo Look at trends during remediation & MNAo Tells us if remediation might be working
Know what to expecto Historical readingso What type of remediation → geochemical impacts
Question the data If it doesn’t make sense – check calibration Once the sampling is complete – It’s too late!