Site Policy & Management · Mandatory · Pre-Construction

RAMS — Piling Operations

A specialist RAMS for piling operations covering CFA, rotary bored, driven, and mini-pile methods. Addresses underground service strike risk (CAT scanning, STATS records, permit to dig), rig stability, ground conditions, noise and vibration under BS 5228, LOLER lifting operations, and bentonite/polymer slurry COSHH requirements. Piling is one of the highest-risk construction activities subject to HSE targeted inspection.

Last reviewed: 29 March 2026 — This guide reflects UK law as of this date. MHSWR 1999 / CDM 2015 remains current with no amendments enacted as of 29 March 2026. Next scheduled review: 29 March 2027.

Legal basis	Management of Health and Safety at Work Regulations 1999 / CDM 2015
Piling types	CFA (continuous flight auger), rotary bored, driven, mini-piles, vibro
Key risks	Underground services, ground instability, rig stability, noise/vibration, dropped objects
HSE focus	Subject to HSE targeted inspection campaigns
Interface documents	Must interface with Environmental Management Plan (M8) and S61 consent (M9)
Enforcing authority	Health and Safety Executive (HSE)

1. Piling RAMS — A Specialist Activity Requiring Specialist Risk Assessment

Piling is one of the highest-risk activities on a construction site. It involves heavy plant operating in close proximity to workers, penetration of the ground to significant depths with the risk of striking unknown underground services, generation of noise and vibration that can affect neighbouring properties and structures, and the handling of hazardous substances including bentonite slurry and polymer fluids. A generic groundworks RAMS is wholly insufficient for piling operations — the activity demands a specialist, piling-specific risk assessment that addresses each of these hazards in detail.

Piling RAMS must interface with the project's Environmental Management Plan (M8) to address noise, vibration, and contamination risks, and with the Section 61 consent (M9) where one has been obtained from the local authority under the Control of Pollution Act 1974. The RAMS must also address the specific piling technique being used, as each method presents different hazards — driven piling generates significantly more noise and vibration than CFA, while rotary bored piling involves the management of spoil and bentonite slurry.

Underground service strikes during piling are a major hazard

Underground service strikes during piling are a major hazard — CAT scanning, STATS records, and a permit to dig are mandatory before any piling rig is positioned. Striking a live high-voltage cable can be fatal. The piling RAMS must include a specific procedure for underground service identification and avoidance, including the use of as-built utility records, CAT and Genny surveys, trial holes where necessary, and exclusion zones around confirmed service routes.

2. RAMS Content

The piling RAMS must address each of the following areas in detail. The level of information required reflects the specialist nature of the activity and the severity of the risks involved.

Area	Detail required
Piling type	Specific piling technique to be used (CFA, rotary bored, driven, mini-pile, vibro), with justification for selection and description of the process
Plant details	Make, model, and specification of the piling rig and all associated plant (crane, concrete pump, auger, casing oscillator). LOLER and PUWER compliance status, thorough examination certificates, operator competence and training records
Ground conditions	Summary of ground investigation data, soil and rock types expected, groundwater level, contaminated land status, obstructions identified. Reference to the geotechnical design report and piling working platform design
Underground services	STATS records obtained, CAT and Genny survey completed, trial holes dug at pile positions where services are identified or suspected, exclusion zones marked, permit to dig in place, procedure for unexpected service discovery
Exclusion zones	Defined exclusion zones around the piling rig during operation, including minimum distances for personnel, plant, and stored materials. Zones must account for rig slew, falling objects, and spoil handling
Noise and vibration	Predicted noise and vibration levels at site boundary and nearest sensitive receptors. Compliance with S61 consent conditions where applicable. Monitoring regime, trigger levels, and contingency actions. PPE requirements (hearing protection zones)
LOLER lifting operations	Identification of all lifting operations associated with piling (auger handling, casing installation, reinforcement cage installation). Lift plans, appointed persons, slingers and signallers, thorough examination certificates
COSHH (bentonite/polymer)	Hazardous substances used in the piling process including bentonite slurry, polymer fluids, concrete additives. Safety data sheets, exposure controls, PPE, storage, spillage procedure, disposal route
Emergency procedures	Site-specific emergency procedures for piling operations including rig failure, underground service strike, ground collapse, entrapment, injury, and environmental incident. Emergency contacts, muster points, first aid provision
Specific risks	Any site-specific risks not covered above, including proximity to existing structures, railways, highways, or watercourses. Interface with other site activities. Working near or over water. Night working requirements

3. Common Mistakes

Using generic groundworks RAMS for piling operations

Piling is a specialist activity with hazards and risks that are fundamentally different from general groundworks. A generic excavation or groundworks RAMS does not address piling rig stability, underground service strike during penetration to depth, bentonite or polymer management, noise and vibration from driven piles, or the specific lifting operations involved in cage and casing installation. The HSE expects piling RAMS to be written by competent persons with specific piling knowledge, and generic RAMS will not withstand scrutiny during an inspection or investigation.

Not verifying underground services before positioning the rig

Positioning a piling rig without first completing a thorough underground service investigation is one of the most dangerous shortcuts in construction. STATS records must be obtained, a CAT and Genny survey must be carried out, and trial holes should be dug at pile positions where services are identified or suspected. The piling RAMS must include a clear procedure for service verification before each pile position is approved for drilling. Striking a live high-voltage cable, gas main, or fibre-optic trunk during piling can result in fatality, explosion, or major infrastructure disruption.

4. Frequently Asked Questions

Is a separate environmental permit required for CFA or bored piling near watercourses?▾

Potentially yes. If the piling operation involves dewatering and the discharge of groundwater to a watercourse or surface water drain, an environmental permit may be required under the Environmental Permitting Regulations 2016, obtained from the Environment Agency. Bentonite slurry and polymer fluids must not enter watercourses under any circumstances — this would constitute a pollution offence under the Environmental Permitting Regulations. The piling RAMS must include a specific procedure for containment and disposal of drilling fluids, and the Environmental Management Plan (M8) should address these risks.

Who should write the piling RAMS?▾

The piling RAMS should be written by a competent person with specific knowledge and experience of the piling technique being used. In practice, this is usually the piling subcontractor's safety professional or contracts manager, working with the piling rig operator and site engineer. The principal contractor should review the piling RAMS to ensure it interfaces correctly with the site-wide Construction Phase Plan, Environmental Management Plan, and traffic management arrangements. Generic RAMS produced without input from the piling team are unlikely to be adequate.

What training do piling rig operators need?▾

Piling rig operators should hold a relevant CPCS (Construction Plant Competence Scheme) or NPORS (National Plant Operators Registration Scheme) card for the category of rig being operated. They must also have received site-specific induction covering the ground conditions, underground service locations, exclusion zones, and emergency procedures for the particular site. Additional training may be required for specific techniques or rig models. The operator's competence and training records must be available on site and referenced in the RAMS.

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