Environmental Measurements: Why They Matter and How to Prepare Your Site

For most industrial sites in Saudi Arabia, environmental measurements are not optional extras. They are how a facility proves, with data, that it is operating within its permit. This article explains which measurements are typically required, the rules behind them, and how to prepare a site so that a monitoring visit runs smoothly and produces results you can rely on.

Why measurements are required

Article 8 of the Environmental Law requires a permit holder whose activity may release emissions or pollutants to comply with the standards set in the regulations, to put in place detection, measurement and monitoring programmes, and to provide the competent authority with periodic data and reports. The executive regulations then set out the detail for each environmental medium. Three are most relevant to industry: air quality, noise, and the protection of aqueous media.

Air emissions from stacks

The Executive Regulations for Air Quality set emission standards for point sources, such as stacks and vents, in their appendices. There are general standards, and specific standards for particular industrial activities.

How you monitor depends on the source:

• Continuous monitoring. Sources listed in the regulation's Appendix 5 must install continuous emission monitoring systems approved by NCEC. NCEC can also require continuous monitoring for other sources based on EIA, audit or inspection results.
• Periodic measurement. Point sources not on continuous monitoring must have their stack emissions measured and analysed annually for the primary pollutants specified in the appendices. Where a facility has several stacks, each is measured separately, although NCEC may approve a reduced annual sample of similar compliant stacks, provided all stacks are measured at least once every four years.
• First measurements. Initial measurements on all stacks are due within 120 days of the facility being established or 40 days of reaching its target production rate, whichever comes first.

The regulation also requires that sampling and analysis follow the latest US EPA methods unless NCEC specifies otherwise, and that measurements are carried out by a service provider licensed by NCEC. For primary sources not on continuous monitoring, the facility must notify NCEC 30 working days before measurements and submit the results report within 40 working days. NCEC or its delegate may attend to supervise.

Ambient air

Ambient air quality is the air around the site rather than inside the stack. NCEC runs national monitoring, and the air quality regulation requires a licence to install and operate an ambient air monitoring network, with installation, operation and maintenance by a licensed service provider. Ambient monitoring may also form part of an EIA baseline, or be required where several sources affect one area.

Noise

The Executive Regulations for Noise set noise level standards for different area types: residential and commercial areas by density, roadsides, and industrial zones, with separate daytime and night-time limits. Construction sites may exceed the standard limits within set hours and correction values, and a prior permit from NCEC is needed to go beyond them.

A permit holder required to monitor noise must follow NCEC's monitoring requirements and keep the data for at least three years. NCEC can also ask for noise modelling, noise maps and a noise reduction plan, for example when permitting a new activity or after a complaint.

Wastewater and industrial effluent

The Environmental Law prohibits discharging wastewater or treated liquids into the environment without a permit. The Executive Regulations for the Protection of Aqueous Media from Pollution set standards that treated wastewater must meet before discharge to land, soil or water bodies.

Certain activities must run monitoring and measurement programmes on water discharged directly to the environment and report data to NCEC regularly. These include wastewater treatment plants above 60 cubic metres per day, industrial wastewater treatment plants, and industrial activities with their own treatment units. The work must be done with a service provider approved by NCEC, and data must be kept for at least five years. Activities that treat wastewater or discharge it to central treatment plants also need lined emergency storage tanks sized for 36 hours of treated volume.

How to prepare a site for a monitoring visit

A monitoring visit is short. The preparation determines whether the results are valid and usable. Before the team arrives:

1. Confirm the scope in writing. Which stacks, which pollutants, which noise points, which water sampling points, and which standards apply. Match it to your permit conditions.
2. Check that the provider is licensed by NCEC for the measurements required.
3. Notify NCEC where required, for example the 30-working-day notice for primary stack sources.
4. Plan representative operation. Measurements should reflect normal operating conditions. Schedule production so that the units being measured are running as they normally do, and record the operating conditions during the test.
5. Make sampling points safe and accessible. Stack sampling ports, platforms, ladders and electrical supply should be ready and checked by your safety team. Water sampling points should be clearly labelled.
6. Assign a site contact with authority to escort the team, issue permits to work, and answer process questions.
7. Gather supporting records: fuel and raw material use, production rates, maintenance and calibration logs for control equipment and monitors, and previous reports.

After the visit

Review the report as soon as it arrives. The air quality regulation expects reports to include the analytical and physical data, operating conditions during the test, calculation methods, results and calibration data, so check that these are present and correct. Compare the results with the applicable limits. If anything is close to or above a limit, act early: the law expects action when approaching limits, and exceedances may need to be reported to NCEC.

File the report with your permit records. You will need it at renewal, and you may need it during an inspection.

The bottom line

Measurements turn compliance into evidence. Knowing which regulation applies, using a licensed provider, running the plant representatively and keeping complete records are what make that evidence hold up.

Sources: MEWA: Executive Regulations for Air Quality (English) · MEWA: Executive Regulation for Noise (English) · MEWA: Executive Regulations for the Protection of Aqueous Media from Pollution (English) · Environmental Law, Royal Decree M/165 (official English translation, Bureau of Experts, hosted by MISA)