Codes referenced
Plan-Do-D-Check-Act loop, aspects register, compliance, operational controls, audit.
Consent to discharge trade effluent from truck washout, settling tanks.
Consent for cement-silo emissions; PM10/PM2.5 stack monitoring.
Authorisation for used oil, admixture containers, cement bags.
Six significant aspects of a typical RMC plant
| Aspect | Source | Operational control | Legal limit / KPI |
|---|---|---|---|
| Dust | Cement silos, aggregate transfer, bag cutting | Baghouse filters on silos · water spray on transfer points · closed conveyors | Stack PM < 30 mg/Nm³ (CPCB) |
| Noise | Batching, mixer, truck loading, transit | Acoustic enclosures · time-of-day limits · PPE for crew | Day 75 dB(A) / Night 70 dB(A) |
| Waste water | Truck washout, aggregate drainage, lab drainage | Settling tank · pH correction · recycle to batching water | pH 6-9, TSS < 100 mg/L |
| Solid waste | Returned concrete, spillage, hardened reject | Concrete recycling (aggregate recovery) · designated slab for spillage | Zero discharge to landfill |
| Soil contamination | Oil/fuel storage, admixture spill | Bunded storage · spill kit · impermeable admixture area | No hydrocarbon in groundwater |
| Energy | Diesel for transit mixers, electricity for plant | Idle-reduction policy · VFD on motors · solar optional | kWh per m³ benchmark |
Reference: ISO 14001:2015 Cl 6.1.2 (environmental aspects); CPCB Industry-Specific Emission Standards for RMC plants; Indian PCB consent conditions.
Worked example — aspects scoring & prioritisation
Scenario. Annual aspects review at a 60 m³/h RMC plant. Scoring: impact (1-5) × likelihood (1-5) × control effectiveness (1-5, where 5 = no control, 1 = fully controlled). Lower score = better. Aspects prioritised by score.
| Aspect | Impact (I) | Likelihood (L) | Control (C) | Score I × L × C |
|---|---|---|---|---|
| Cement-silo dust | 4 (high) | 3 | 2 (baghouse) | 24 |
| Aggregate dust | 3 | 4 | 2 (water spray) | 24 |
| Washout water | 3 | 5 (every batch) | 1 (settling + recycle) | 15 |
| Noise (boundary) | 4 | 3 | 2 (enclosures) | 24 |
| Used oil storage | 5 (severe) | 1 (bunded) | 1 (rare) | 5 |
| Admixture spill | 3 | 3 | 3 (kit) | 27 |
Priorities for next 12 months: Admixture spill control (highest score 27), then dust/noise trio (24 each). Used-oil storage is low-risk because the bund + low frequency keep the score at 5; do not deprioritise the inspection cadence.
Common deviations seen at Indian RMC plants
Auditor's first question. Without Cl 6.1.2 outputs, the rest of the EMS is unverifiable.
PM emissions rise as filter bags blind. Quarterly stack monitoring catches it only if you sample the right day. Routine ΔP across the baghouse catches it weekly.
High pH and TSS — illegal discharge to municipal drain. ISO 14001 requires treatment or recycling.
Operation under expired consent is the most-filed PCB complaint. Consent renewal is 60-90 days before expiry — track from day one.
Field-checklist blocks
A short questionnaire, an inspector's checklist, and three worked examples that show how the six-aspect register and its scores turn into a 12-month improvement plan and a PCB consent file that survives an audit.
Questionnaire — ask at the annual aspects review, before the Cl 9.1.2 compliance evaluation is signed
- Is there a written aspects register covering all six aspects (dust, noise, waste water, solid waste, soil contamination and energy), or does the plant's environmental awareness still live in the heads of three people? Without the ISO 14001:2015 Cl 6.1.2 output, nothing else in the EMS can be verified.
- Has every aspect been scored impact × likelihood × control effectiveness, with control rated so that 5 means no control and 1 means fully controlled, and with the lowest total treated as the best score?
- Does the top of the 12-month plan match the top of the scores, or does it match whichever aspect somebody finds most uncomfortable to write down?
- Has a low score been read as a licence to relax? Bunded oil storage at a score of 5 is still inspected on a fixed cadence. The score sets priority, not inspection frequency.
- Are the baghouse ΔP and the stack PM being read weekly, rather than only at the quarterly stack monitoring that is supposed to catch a blinded filter?
- Is all washout water going to the settling tank and back to batching, with pH and TSS inside the consent limits, or is some of it still finding the municipal drain?
- Is the PCB Consent to Operate current, and is the renewal clock started 60 to 90 days before expiry instead of after the notice arrives?
- Does the Cl 9.1.2 evaluation cover the plant's own environmental objectives as well as its legal obligations, and does the result actually reach the annual management review?
Inspector's checklist — what to verify on site
- Aspects register: the six aspects, with the impact, likelihood and control rating for each and the source of every rating (observation, incident, test result or consent condition).
- Scoring sheet: impact (1-5) × likelihood (1-5) × control (1-5), written out, with the control scale stated so that 5 = no control and 1 = fully controlled.
- 12-month plan: the highest-scoring aspect named first, with the specific control that will change it and the month it lands.
- Baghouse record: the weekly ΔP readings against the quarterly stack PM monitoring report, with the CPCB limit of Stack PM < 30 mg/Nm³ written on the sheet.
- Washout water record: settling tank, pH correction, recycled volume back to batching, and the pH 6-9 and TSS < 100 mg/L results.
- Consent file: the Consent to Operate document, its expiry date, and the 60-90 day renewal trigger sitting on the plant calendar with an owner against it.
- Containment: bund integrity and spill-kit check for oil and fuel, the impermeable admixture area, the designated spillage slab, and the concrete recycling record for returned concrete.
What happens if… three worked examples
What happens. Admixture spill scores impact 3 × likelihood 3 × control 3 = 27, the highest in the register, because the only control is a spill kit and spills do happen. Used-oil storage scores 5 × 1 × 1 = 5, the lowest, because the bund is in place and spills are rare. The dust and noise aspects sit behind the leader at 4 × 3 × 2 = 24 each. The 12-month plan therefore opens with admixture spill.
Likely outcome. Admixture spill gets an impermeable area and bund as engineering controls. Once those are in, control effectiveness moves from 3 to 1 and the score falls from 27 to 9, and the aspect drops down the list on its own. Used-oil storage stays at the bottom, which is where it belongs, and the bund inspection cadence still does not change. A low score is a statement about the control, not a decision to stop looking at the control.
Preventive correction. Score the aspects before the plan is written, not after, and keep the arithmetic on the sheet so a later auditor can see why one aspect got the money.
What happens. Cement-silo dust carries a control rating of 2, because the baghouse is doing some of the work but nobody measures it. The aspect scores 4 × 3 × 2 = 24. When the filter bags blind, PM at the stack climbs towards the CPCB limit of Stack PM < 30 mg/Nm³, and the quarterly stack monitoring catches it only if the sampling day happens to be a bad one. Routine ΔP across the baghouse catches it weekly.
Likely outcome. Bring the baghouse maintenance back and the control rating returns to 1, so the same aspect now scores 4 × 3 × 1 = 12 and moves down the plan on its own. The plant keeps a weekly operating record instead of relying on one quarterly sample. If the stack reading does exceed 30 mg/Nm³ on the day it is measured, that is a legal non-compliance and it goes into the Cl 9.1.2 compliance evaluation, not into a maintenance log.
Preventive correction. Put the ΔP trend sheet next to the quarterly stack report. The two answer different questions, and only one of them runs every week.
What happens. Washout water scores 3 × 5 × 1 = 15: every batch generates it, so likelihood is 5, and the settling tank plus recycle keeps the control rating at 1. On paper, 15 puts it below the three aspects at 24, so it slides down the priority list. Discharge it untreated and it breaches both consent limits at once, pH 6-9 and TSS < 100 mg/L, and it becomes an illegal discharge to the municipal drain.
Likely outcome. A legal breach outranks an internal score. The aspect is pulled back up, the settling tank and pH correction are verified, and the water is recycled to batching water, which is the audit-friendly zero-discharge target. The scoring exists to tell you where the money and the effort go. It does not decide which breach the plant can afford to make.
Preventive correction. Check the drain, not just the tank. A settling tank that is full, bypassed or discharging to a sump makes the whole zero-discharge claim fictional.
Frequently Asked Questions
What are the significant environmental aspects of a typical RMC plant under ISO 14001?
How is compliance evaluated under ISO 14001 Cl 9.1.2?
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Amit Haridas
Founder & Proprietor, ConcreteInfo. 25+ years experience in construction QA/QC, concrete technology, RMC plant operations, consulting and technical training across India. ISO Lead Auditor. For an ISO 14001 readiness review or State PCB consent preparation, contact amit@concreteinfo.in.
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