Quality Assurance, Control and Assessment for the RTWQ Monitoring Program
To
ensure the effectiveness and reliability of the Real Time Water Quality
(RTWQ) Monitoring Program, quality assurance, quality control and quality
assessment procedures have been implemented.
Quality Assurance
Quality
Assurance (QA) includes all high-level activities, structures and mechanisms
used to ensure and document the accuracy, precision, completeness,
effectiveness and representativeness of the RTWQ monitoring program.
Quality assurance ensures the overall integrity of the program design
and consists of two separate but interrelated activities: Quality Control
(QC) and Quality Assessment. Quality
Assurance program elements include:
- Provincial
RTWQ monitoring program plan.
- Purchasing
control to ensure all instruments in the network are made from a sole
manufacturer (ie. Hydrolab).
- Ensuring
probe maintenance and warranty checks are carried out in compliance with
manufacturer recommendations.
- Personnel
qualification and training.
- Technical
procedures for sampling and conducting field and analytical work.
- Troubleshooting
of instruments, recording equipment, installations, transmission of data
and corrective action plans.
- Record
keeping including chain of custody for grab samples, logbooks and
instrument calibration records.
- Implementation
of QA/QC procedures including data verification
and validation.
- Preparation
of analytical reports, data packages and RTWQ web page.
- Assessments
to determine whether personnel are adhering to program requirements and
following internal procedures.
- Expert
peer review of RTWQ program design, QA/QC procedures and data analysis.
- Keep
up to date on emerging RTWQ technology, QA/QC procedures, and analysis
techniques.
- Develop
first hand knowledge of each individual watershed through observation
and field visits.
Quality Control
Quality control refers to
the technical activities employed to ensure that the data collected are
adequate for quality assessment purposes.
This includes feedback systems to ensure activities are working as
planned and intended, and to verify that procedures are being carried out
satisfactorily. Quality Control program elements include:
- Maintenance
and calibration of the probe and its sensors on a monthly basis.
- Inspection
and maintenance of RTWQ station installation.
- Field
readings taken at the time of removal and reinstallation of the probe
for maintenance and calibration purposes using a calibrated field
instrument.
- Collection
of a water quality grab sample at the time of reinstallation of the
probe to be sent to a laboratory for analysis.
- Updating
maintenance forms with collected field instrument readings after
reinstallation.
- Using
field results taken during removal of the probe with the field
instrument, data from the preceding period is corrected for drift.
- Storing
of corrected data in a separate database.
- Updating
spreadsheet with grab sample results once laboratory analysis is
complete.
Quality Assessment
Quality
assessment activities are implemented to quantify the effectiveness of the
quality control procedures. Quality
Assessment program elements include:
- Comparison
of field results (taken during removal and reinstallation with the field
instrument) with the chronologically closest RTWQ results from the probe
to evaluate the amount of drift observed in water quality parameters
over that period.
- Evaluate
whether field and actual readings are within acceptable ranges, by how
much the reading is off (if not within acceptable ranges), and reasons
why the parameter reading may be off.
- Calculate
long-term and monthly period summary statistics using the corrected
data.
- Produce
time series graphs for each parameter and evaluate for gaps, data
errors, and guideline exceedances for pH, dissolved oxygen and
turbidity.
- Publishing
and daily updates of RTWQ data from telemetry sites on the Water
Resources Division web page for review.
- Preparation
of auxiliary information to aid in the review of water quality records.
- Produce
a monthly period report for each station, including any problems with
maintenance, calibration and QA/QC procedures; any data issues; time
series graphs and summary statistics for each parameter; brief
explanations for observed results; and data qualification statements.
- Produce
an annual report for each RTWQ station at the end of each calendar year.
- Archiving
of RTWQ monitoring data records.
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