Calibration gaps, invalid data and an auditor auditing their own work
Harlow Castings operates a foundry with an air permit. It monitors particulate matter using a continuous extractor sensor, wastewater flow with an inline meter, effluent pH with a handheld meter, and energy from utility bills. The monitoring plan says 'monthly', but records show three months missing. The pH meter's calibration sticker expired 14 months ago; the external laboratory's accreditation expired last year; the continuous monitor has had no zero or span check recorded. The environmental manager performs internal audits of every EMS clause and also signs off the quarterly compliance evaluation. Management review last met 15 months ago. The legal register is updated annually, but there is no record that fulfilment of legal requirements has been evaluated. Production changed a coating line six months ago.
1. Evaluate the monitoring and measurement arrangements against clause 9.1.1 and identify the data-quality consequences.
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Monitoring is not reliably implemented. Missing three months means the plan is not being followed. The plan itself is weak because it does not specify method, frequency, responsible person, acceptance criteria or what analysis will be done. The pH meter's expired calibration means data since then are of unknown validity; those results should be quarantined and assessed, not used to claim compliance. The laboratory accreditation expiry raises questions about the defensibility of results. The continuous monitor needs zero/span checks, maintenance and calibration records. Energy from utility bills is a valid aggregate but too coarse for process control. Clause 9.1.1 requires calibrated or verified equipment, documented evidence, and analysis and evaluation of results. The organization should define the monitoring plan, restore calibration, validate or discard suspect data, and assess the impact on past compliance evaluations.
2. Evaluate the compliance evaluation and internal audit arrangements against clauses 9.1.2 and 9.2.
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Updating the legal register is not compliance evaluation. Clause 9.1.2 requires evaluating fulfilment of compliance obligations at planned intervals and maintaining evidence. There is no such record, so this is a nonconformity. The environmental manager auditing all clauses and signing the compliance evaluation compromises independence; clause 9.2 requires impartiality and objectivity. The audit programme should consider importance, changes and previous results, cover all clauses over a cycle, and use auditors who do not audit their own work. A production change six months ago should have triggered a review of aspects, compliance obligations and audit scope. Management review at 15-month intervals may also breach the organization's own planned interval and fails to provide top-management oversight of audit results, compliance status, objectives and improvement actions.
3. Design the key elements of a corrected monitoring, measurement and evaluation programme.
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The programme should define, for each significant aspect and compliance obligation, what is monitored, the method, frequency, location, responsible person, equipment, calibration interval and acceptance criteria. It should include a calibration schedule and verification of laboratory accreditation, with records traceable to the measurements. Data should be reviewed against baselines and limits, and invalid data quarantined and investigated. Compliance evaluation should be scheduled at planned intervals, cover each obligation, and record the evidence and conclusions. Internal audits should be assigned to independent auditors and planned over a cycle. Management review should receive monitoring results, compliance status, audit findings and objective progress. The programme should also respond to the coating-line change by reviewing aspects and controls rather than continuing with an outdated plan.