Quality Management & Methodological Framework
Waterledge Consultancy operates an internal Quality Management System (QMS) structured in alignment with BS EN ISO 9001:2015 principles, tailored specifically for an independent principal occupational hygiene practice.
ISO 9001-Aligned Quality Control Architecture
Proportionate quality governance ensuring repeatability, metrological validity, and defensible compliance reporting.
Document & Data Control
Version-controlled survey templates, raw field data logs, and peer-reviewed statutory reporting protocols retained securely for a minimum of 40 years in compliance with COSHH Regulation 9 & 10 record-keeping duties.
Metrological Traceability & Calibration
All primary flow calibrators, personal air sampling pumps, micromanometers, thermoanemometers, and Class 1 acoustic instrumentation hold current certificates of calibration traceable to UKAS / National Physical Laboratory (NPL) standards.
UKAS / ISO 17025 Analytical Subcontracting
All collected filter cassettes, sorbent tubes, and impinger media are dispatched under strict Chain of Custody (CoC) exclusively to UKAS-accredited (ISO/IEC 17025) partner laboratories participating in AIR PT / WASP proficiency schemes.
Impartiality & Sole-Principal Governance
Operating as an independent consultancy free from equipment supply or abatement installation conflicts of interest. All control recommendations follow the statutory COSHH Hierarchy of Control.
Core Occupational Hygiene Standards & Methodologies
All field investigations, air sampling strategies, and engineering control appraisals are executed in strict accordance with the following standards:
Workplace Exposure — Measurement of Exposure by Inhalation to Chemical Agents
Strategy for testing compliance with occupational exposure limit values (OELVs). Incorporates Basic Characterization, constitution of Similar Exposure Groups (SEGs), Preliminary Testing, and statistical 70% confidence evaluation of the 95th percentile.
General Methods for Sampling and Gravimetric Analysis of Respirable, Thoracic and Inhalable Aerosols
Strict adherence to cyclone/IOM sampler selection, pre- and post-sampling flow rate calibration within ±5%, field blank deployment, and gravimetric analytical chain of custody.
Substance-Specific Methods for the Determination of Hazardous Substances
Deployment of validated HSE methods including MDHS 25/4 (Organic Isocyanates), MDHS 88 (Volatile Organic Compounds), MDHS 91 (Metals & Metalloids in Air by ICP-AES/MS), and MDHS 101 (Crystalline Silica in Respirable Airborne Dusts).
Monitoring Strategies for Toxic Substances
Structured framework governing initial appraisal, worst-case screening vs. representative personal monitoring, and the integration of biological monitoring or dermal assessment where appropriate.
Controlling Airborne Contaminants at Work: A Guide to Local Exhaust Ventilation (LEV)
Statutory Thorough Examination and Testing (TExT) under COSHH Regulation 9. Covers hood capture/receiving aerodynamic appraisal, duct transport velocities, static pressure differentials, qualitative smoke visualization, and commissioning benchmark verification.
International Validated Sampling & Analytical Methodologies
Utilisation of NIOSH Manual of Analytical Methods (e.g., NMAM 0500, 0600, 7300, 1501) and OSHA Partially/Fully Validated Methods where UK MDHS protocols are superseded or where specific sorbent/filter media combinations offer superior Limits of Quantification (LOQ).
Threshold Limit Values & Industrial Ventilation Benchmarks
Referenced alongside UK EH40 Workplace Exposure Limits (WELs) to provide state-of-the-art toxicological benchmarking where UK statutory limits are absent, outdated, or require supplementary hygiene context.