Evaluation of Water Quality Monitoring Programs …...Evaluation of Water Quality Monitoring...
Transcript of Evaluation of Water Quality Monitoring Programs …...Evaluation of Water Quality Monitoring...
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Evaluation of Water Quality
Monitoring Programs and Statistical
Analysis Tools to be utilized in Shale
Development
Uni Blake
Environmental Affairs
Hometown Energy Group
Prepared for:
USEPA Hydraulic Fracturing Workshop
Case Studies
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w Overvie
Groundwater
monitoring is complex
Current baseline
monitoring strategies
Background
monitoring programs
Suggested Shale
Monitoring program
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Complex/ V
Quality
ariability Baseline Water
Different water source in aquifer = variable water quality
Wells
Sand and
gravel
aquifer
Water
table
Saturated
zone Low-yield fractured bedrock
aquifer
Low permeability till
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ve Data Objecti
Sample sizes enough for comparison
“before and after” Abrupt changes (blowouts, casing failures)
Long term changes (seeps, surface spills)
Pre-existing issues
Representative of groundwater/surface
water quality
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es Data Objectiv
2.3 Sampling Procedures
Baseline groundwater samples must be collected any time prior to the setting of the oil and gas
A second sample will be collected from each groundwater feature no later than one year after
well completion……
Post-completion samples must be collected every two years while wells are actively being drilled and completed on a pad, and within one year following completion of the final well on the pad.
http://region8water.colostate.edu/PDFs/Factsheet%20COGA-sample-analysis-Plan.pdf
Current Monitoring Strategies
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s Data Objective
Not enough data points
Current Monitoring Strategies
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m Shale Monitoring Progra
Data Objectives
Monitoring Program
Data Collection
Manage Data
Assess interpret
data
Share results
Goal: Looking for
changes in water quality
parameters during/after
shale development
activity
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is Data Analys
Ideal: No trends
Linear, linear with
breakpoint, step
changes (abrupt)
HVHF related activity
Historical
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es a ObjectivDat
• Natural variation in the
concentration of
methane and other well
quality parameters.
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nt Data Manageme
Organize and store data (databases,
spreadsheets)
Determine data quality
Document assumptions and methods
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ds Analytical Tools/Metho
Cost
Reliability
Technical Support
Non-parametric Trends
◦ Sen Slope / Kendall Theil
◦ Seasonal Kendall Test
◦ Wilcoxon-Mann Whitney Step Trend
Regressions
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L 4.1 s ProUC
es Time Seri
Methane Trend Analysi
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L 4.1 s ProUC
nn-Ke all nd
Trend Analy
Ma
Methane si
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ns Consideratio
Good & Enough data (QA/QC)
Support industry (affordability) and landowner (convenience)objectives
Limit parameters assessed- (look for indicators like methane, barium, chloride, strontium etc.)
Limit collection points
Integrate all monitoring efforts ◦ Manage water quality in a tier system of data
quality
Who maintains the data? Who pays?
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s Reference
Hirsch R.M., J.R. Slack and R.A. Smith, 1982. Techniques of Trend Analysis for Monthly Water Quality Data. Water Resources Research, Vol. 18 (1) pp. 107-121 February.
Coleman, Nancy P., and Debby McElreath. "Short-term Intra-Well Variability in Methane Concentrations from Domestic Well Waters in Northeastern Pennsylvania." (April 2011)
Hirsch, Robert M. "Statistical Methods And Sampling Design For Estimating Step Trends In Surface-Water Quality." Journal of the American Water Resources Association24.3 (1988): 493-503.
Hirsch R.M., R.B. Alexander, and R.A. Smith 1991. Selection of Methods for the Detection and Estimation of Trends in Water Quality. Water Resources Research, Vol. 27(5), pp. 803-813 May.