CWEA ECI Grade 1 KSA 101-109 Exam
Questions and Answers
To obtain representative samples that provide accurate data for compliance monitoring,
process control, or research purposes. - ANS-Primary goal of sampling in wastewater
management
Grab samples and composite samples. - ANS-Two main types of samples used in
wastewater sampling
When a sample is needed to represent the conditions at a specific point in time. - ANS-
When should a grab sample be used
A collection of individual samples taken at regular intervals over a period, combined to
reflect average conditions. - ANS-What is a composite sample
To prevent changes in the sample composition due to chemical reactions, biological
activity, or physical changes during storage and transport. - ANS-Why is sample
preservation important in wastewater sampling
Acidification (e.g., with sulfuric acid) to lower pH, refrigeration, and the use of chemical
preservatives to inhibit biological activity. - ANS-Common preservatives used in
wastewater sampling
It is a legal record that tracks the possession, handling, and location of samples from
collection to analysis, ensuring sample integrity and admissibility in legal proceedings. -
ANS-Purpose of a Chain of Custody (COC) in sampling
Use personal protective equipment (PPE), follow safety protocols for handling
hazardous materials, and ensure proper training in sampling procedures. - ANS-Safety
precautions during sampling
In a manner that preserves their integrity, typically in coolers with ice packs to maintain
a low temperature. - ANS-How should samples be transported to the laboratory
To ensure the reliability and accuracy of sampling and analysis by minimizing errors and
verifying that methods meet regulatory standards. - ANS-Role of Quality
Assurance/Quality Control (QA/QC) in sampling
pH is a measure of the acidity or alkalinity of a solution, with a scale ranging from 0 to
14. It is crucial in wastewater treatment to ensure that the water is neither too acidic nor
Questions and Answers
To obtain representative samples that provide accurate data for compliance monitoring,
process control, or research purposes. - ANS-Primary goal of sampling in wastewater
management
Grab samples and composite samples. - ANS-Two main types of samples used in
wastewater sampling
When a sample is needed to represent the conditions at a specific point in time. - ANS-
When should a grab sample be used
A collection of individual samples taken at regular intervals over a period, combined to
reflect average conditions. - ANS-What is a composite sample
To prevent changes in the sample composition due to chemical reactions, biological
activity, or physical changes during storage and transport. - ANS-Why is sample
preservation important in wastewater sampling
Acidification (e.g., with sulfuric acid) to lower pH, refrigeration, and the use of chemical
preservatives to inhibit biological activity. - ANS-Common preservatives used in
wastewater sampling
It is a legal record that tracks the possession, handling, and location of samples from
collection to analysis, ensuring sample integrity and admissibility in legal proceedings. -
ANS-Purpose of a Chain of Custody (COC) in sampling
Use personal protective equipment (PPE), follow safety protocols for handling
hazardous materials, and ensure proper training in sampling procedures. - ANS-Safety
precautions during sampling
In a manner that preserves their integrity, typically in coolers with ice packs to maintain
a low temperature. - ANS-How should samples be transported to the laboratory
To ensure the reliability and accuracy of sampling and analysis by minimizing errors and
verifying that methods meet regulatory standards. - ANS-Role of Quality
Assurance/Quality Control (QA/QC) in sampling
pH is a measure of the acidity or alkalinity of a solution, with a scale ranging from 0 to
14. It is crucial in wastewater treatment to ensure that the water is neither too acidic nor
