By Brad Meadows – Quality, Technology & Innovation Director

Brownfields projects rarely follow a straight path. An initial investigation may be followed by additional delineation, financing delays, remedial design, redevelopment, and years of monitoring. Over time, ownership, consultants, regulators, laboratory personnel and regulations may all change.

Yet data generated across every phase must support one defensible outcome.

That makes data continuity a critical project risk. While a dataset may be technically valid, changes in reporting limits, analytical methods, quality-control criteria, or data formats may create challenges in comparability. These differences may be apparent until the team prepares a remedial action plan or closure package. By then, resolving them may require reanalysis, additional sampling or qualification of historical data.

Brownfields Vulnerability

Brownfields investigations often progress in phases and each creates an opportunity for unintended changes in the data deliverable.

Each laboratory may use a different preparation procedure. A revised analytical method may have different sensitivity or quality control requirements. A reporting limit for a key compound may increase above a regulatory criterion. Target analyte lists, units, or electronic data formats may also change.

While changes do not automatically make data unusable, problems do arise when they are not evaluated and incorporated into the project’s QAPP. Without continuity, an apparent concentration trend could reflect an analytical difference rather than a change in site conditions.

QAPP Management

A QAPP should function as the project’s living blueprint, not as a document approved and filed away.

Before each phase, the project team should confirm that the QAPP still reflects current objectives, contaminants of concern, regulatory criteria, matrices, methods, reporting limits, quality-control requirements, and deliverable formats.

That review should address practical questions such as:

• Do the reporting limits support current cleanup criteria?
• Are lab procedures consistent with previous phases?
• If not, will results remain technically comparable?
• Have analyte lists, units, or compound names changed?
• Are laboratory accreditations appropriate and current?
• Are the QC indicators and acceptance criteria consistent?
• Can new electronic deliverables integrate with the historical database?

Necessary changes should be documented through a QAPP amendment. The record should explain what changed, why it changed, and how any effect on data usability will be addressed.

Regulator Needs

When reviewing a closure request, regulators need confidence that the data support the closure decision. Their review extends beyond whether individual laboratory reports were valid. The overall dataset must be complete, traceable, representative, comparable and suitable for its intended use.

Potential concerns include unexplained reporting limit changes, incomplete quality-control information, inconsistencies between laboratory reports and project databases, and methods that do not meet current requirements. Regulators may also question trends when results across phases are not readily comparable.

This may require more than clarification. A project could require data revalidation, database reconciliation, confirmation sampling or repetition of part of the investigation. These steps can affect regulatory schedules, property transactions, grant milestones, construction sequencing and financing.

Lab Partner Expectations

Data continuity should be addressed when selecting and onboarding the laboratory, not after sampling begins. Brownfields project managers should expect their laboratory partner to:

• Review the QAPP and project requirements prior to sampling.
• Confirm that methods and reporting limits meet regulatory criteria.
• Compare proposed methods with those used in earlier phases.
• Identify changes affecting sensitivity, bias, precision or comparability.
• Maintain records of method revisions, deviations and corrective actions.
• Provide consistent reports, qualifiers, units and electronic deliverables.
• Communicate promptly when matrix interference, dilution, holding-time concerns, or other conditions may affect data usability.
• Retain project knowledge during personnel transitions and extended pauses.

A capable laboratory partner should also help distinguish administrative changes from those that could affect technical conclusions, especially when regulations or methods evolve during a long-duration project.

Creating Continuity

Brownfields data defensibility is not achieved through a final quality check. It is built phase by phase through planning, documented change control, and communication among the consultant, laboratory, owner and regulator.

Treating the QAPP as a living blueprint – and requiring the laboratory to actively support that plan – can reduce surprises at closure. More importantly, it helps ensure that years of analytical results remain a coherent, defensible record of site conditions and remedial progress.

The Author:

Brad Meadows is Quality, Technology & Innovation Director at ALS USA Environmental. Brad leads a national team of professionals supporting quality systems, technical advancement and the delivery of consistent, defensible analytical data for environmental investigations and remediation programs. Brad.meadows@ALSGlobal.com