Asbestos in Soil Reading — control the groundworks from first fragment to final validation
Unexpected suspect asbestos uncovered during excavation?
Stop disturbing the affected location, prevent plant and personnel trafficking through the discovery, control access and avoid mixing the affected soil into clean stockpiles until the find has been assessed.
One fragment does not automatically define the asbestos risk across the whole site
Ground-risk decisions need to consider distribution, material form and the earthworks that will disturb the soil.
Distribution
Establish whether contamination is isolated, concentrated in a hotspot, associated with a fill layer or dispersed through made ground.
Asbestos form
Intact cement fragments present a different handling question from fine, highly fragmented or friable asbestos debris.
Earthworks
Excavation, screening, stockpiling, loading and processing change exposure and spread potential compared with undisturbed buried material.
Build the asbestos strategy around site history and proposed earthworks
Historic buildings, demolition footprints, imported fill, former industrial activity and previous investigations can help explain likely source and distribution.
The asbestos strategy should align with foundations, drainage, services, piling, formation reductions, landscaping and stockpile movement.
Useful information
- site investigation report
- previous land use
- made-ground depth
- previous asbestos results
- earthworks drawings
- stockpile / haul routes
- receptors and boundaries
- future land use
A watching brief should actively manage discoveries, not simply observe the excavator
Pre-start review
Review investigation data, excavation areas, controls and unexpected-find procedure.
Observe relevant works
Monitor soil disturbance so suspect materials can be identified before wider spread.
Manage discoveries
Stop, redirect or segregate affected work and coordinate sampling or assessment.
Record evidence
Document locations, depths, samples, photographs, soil movements, instructions and outcomes.
Picking, targeted excavation, capping or a combined strategy?
The appropriate approach depends on asbestos form, distribution, development layout, waste/material status and the agreed remediation strategy.
Controlled picking
Can form part of a strategy where contamination is visible, accessible and suitably robust.
Targeted / bulk excavation
May be needed where asbestos is dispersed, highly fragmented, more friable or incompatible with development.
Retention beneath cover
Can be considered where the site-specific remediation strategy and regulatory/material position support on-site retention.
Air monitoring
Task-appropriate monitoring may support excavation, screening, picking or perimeter questions where justified by the risk assessment.
Historic gasworks, railway, printing, engineering and industrial uses can leave complex made ground
Historic industrial uses
Reading Borough Council identifies historic gasworks, railways, scrap yards, chemical works, metal finishing, paper and printing, engineering, defence uses, petrol stations, landfills and sewage works among local activities capable of causing land contamination.
Redevelopment and piling
Reading's planning policy requires proportionate site investigation where contamination may be an issue. Earthworks, foundations, services and piling can expose or mobilise contamination and should be planned using a source-pathway-receptor approach.
Asbestos within made ground
Visible fragments are one part of the evidence. Distribution, asbestos form, fill depth, intended earthworks, exposure pathways, waste status and proposed end use need to be considered together.
See Reading Borough Council's contaminated-land strategy and CL:AIRE asbestos-in-soil guidance.
Reading supported through ASM's South East and national teams
ASM supports projects throughout Reading, Berkshire and the Thames Valley through its regional and national operations. The nearest listed ASM South East office is in London. Bulk sample analysis is undertaken at ASM's UKAS-accredited Sunderland headquarters laboratory within the applicable accredited scope.
ASM South East Regional Support
Reading & Thames Valley enquiries:
0330 433 9680
Survey:
survey@asbestosSM.co.uk
London regional office:
3rd Floor
45 Albemarle Street
Mayfair, London
W1S 4JL
020 3004 4184
Monday–Friday
08:00–18:00
UKAS Accreditation No. 32982
Reading, Berkshire & Thames Valley coverage
Reading Town Centre, Broad Street, Friar Street, Oxford Road, Castle Hill, Caversham, Tilehurst, Calcot, Southcote, Whitley, Coley, Earley, Lower Earley, Woodley, Shinfield, Winnersh, Wokingham, Theale, Pangbourne, Purley-on-Thames, Sonning, Twyford and the wider Thames Valley, subject to project requirements.
Attendance is subject to project requirements, scope, access and availability.
ASM's defined asbestos inspection activities are accredited to ISO/IEC 17020 and defined testing activities to ISO/IEC 17025 under UKAS accreditation number 32982. Current UKAS schedules define the precise scope and accredited locations.
Reading services connected to contaminated-land work
Connect the ground strategy to sampling, air monitoring, demolition, removal and wider redevelopment decisions.
Reading & Berkshire FAQs
What should we do if suspect asbestos is found during groundworks?
Stop disturbing the affected area, prevent unnecessary trafficking and spread, control access and arrange competent assessment before the affected excavation continues.
What is an asbestos watching brief?
It is competent support during relevant excavation and soil movement, including observation, unexpected-find control, sampling coordination, monitoring where appropriate and records of discoveries and actions.
Can asbestos cement fragments simply be picked out?
Sometimes controlled picking can form part of a remediation strategy where contamination is visible and suitably robust. It is not automatically suitable for dispersed or friable contamination.
Does one negative sample prove the site is clear?
No. Made ground can be heterogeneous, so interpretation needs to consider site history, sampling coverage, distribution, depth and proposed earthworks.
Is air monitoring required on every contaminated-ground project?
No. The need and monitoring type should be based on the risk assessment and actual activity.
Is asbestos-in-soils remediation UKAS accredited?
No. Soil remediation itself is not described as UKAS accredited. ASM holds UKAS 32982 for defined inspection and testing activities that may support a project.
Send the site information before more affected ground is moved
Provide the site address, investigation data, asbestos results, remediation strategy, discovery locations, earthworks plan, photographs and programme. ASM can define an appropriate watching-brief, analytical or remediation-support scope.