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Quality control checks of field and laboratory sampling and analysis serve two purposes: to document the data quality, and to identify areas of weakness within the measurement process which need correction. Include a summary table of data quality assurance objectives that, at a minimum, lists: o Analysis Group (e.g., volatile organic compounds) o Medium o Practical Quantitation Limits (PQL) o Spike Recovery Control Limits (%R) o Duplicate Control Limits +/-(RPD) o QA Sample Frequency o Data Validation A reference may note the specific pages from USEPA's SW 846 Guidance Document that list the test method objectives for precision and accuracy. If the field and laboratory numerical data quality objectives for precision are the same and presented on a single table, then a statement should be made to this effect and added as a footnote to the table (e.g., "These limits apply to both field and laboratory duplicates"). Include a copy of the analytical laboratory quality assurance/quality control plan in the appendices of the Workplan and provide the equations for calculating precision and accuracy. 6.1 Field Quality Control Samples 6.1.1 Field Duplicates Duplicates are additional samples that must be collected to check for sampling and analytical precision. Duplicate samples for all parameters and media must be collected at a frequency of at least one sample per week or 10 percent of all field samples, whichever is greater. Duplicates should be collected from points which are known or suspected to be contaminated. For large projects, duplicates should be spread out over the entire site and collected at regular intervals. Duplicates must be collected, numbered, packaged, and sealed in the same manner as other samples; duplicate samples are assigned separate sample numbers and submitted blind to the laboratory. 6.1.2 Blank Samples SCOPE OF WORK FOR A FACILITY INVESTIGATION WORKPLAN ATTACHMENT D PAGE 9