Remediation of Asbestos Impacted Soils

Remediation of Asbestos

Impacted Soils

Presentation by:

Robin Crowther - JPC Environmental Services

Craig Chaplin – Elvanite Recycling Ltd

Introduction

Site Investigation – Robin Crowther

Site Works – Craig Chaplin

Validation – Robin Crowther

Site Investigation

Know your site

Know your soil

Know your contaminant

Presentation by JPC Environmental Services Ltd & Elvanite Recycling Ltd Remediation of Asbestos Impacted Soils

Site Investigation – know your site


Small farm with

residual buildings

and paddock land –

approximately

8,600m2

Site Investigation – know your site


Trial Pit Locations

Site Investigation – know your Soil


Made Ground – dark brown, slightly gravelly, slightly

clayey SAND. Gravel is fine to coarse flint, brick and clay

roofing tile with occasional slate, charcoal and asbestos

fragments

The coarser made ground was generally encountered

along the line of the access road, farm yard and under

former building footprints. Elsewhere surface deposits of

asbestos cement board/drainage pipe were identified

over highly organic topsoil.

Site Investigation – know your contaminant


Asbestos Risk

Site Investigation – know your contaminant


Development Requirements


Development Requirements


Opportunity to retain suitable material on site

Fill areas such as

Building footprint

Carpark

Design Constraints

Engineering requirement for a ground bearing slab, ruled out the placement of material beneath building footprint– Type 1 fill required.

Drainage requirement for soakaway restricted the fill area of the carpark for fibre impacted fines.

Regulatory Involvement


Local Planning Authority – contaminated

land conditions

Environment Agency –

environmental permitting

Exemptions

CL:AIRE – DoW DI CoP

enforcement position statements

Disposal of surplus soil

Contaminants of concern

Waste classification –

Waste acceptance criteria testing

Tip discretion

WM3 requirements

Pre-treatment requirements


WM3 Technical

Guidance


Site Work – Craig

Chaplin

Site Works –

Delivering the strategy on site

Adopt common strategy to

satisfy both reuse and off site

disposal demands

Site walkover and hand pick all

visible surface deposits

Strip site in a defined sequence to

minimise cross contamination

Moving from low risk to high risk


Site Works –



Localised caches / concentrated hotspots were identified, isolated to start, then treated at source as far as possible.

Excavated soils only screened once the bulk of the asbestos removed.

Site Works –



Site Works –



Site Works –



The stock piles were placed within their

own risk areas to further reduce the

risk of cross contamination

The clean/low risk soils stripped from

the green/paddock area, were retained

on site as topsoil, subject to validation

sampling

The medium and high risk material was

screened under controlled conditions,

hand picked to remove asbestos

Site Works –



Dust fighter (fogging unit) used to prevent fibre release

Site Works –



Personnel and perimeter air monitoring was

undertaken to verify that control measures were

working correctly

Site Works –


Green waste and assorted debris separated from topsoil

Site Works –


Recycled aggregate

recovered from

made ground

Utilised on site to

form sub-base to

car park

Site Works –


Screened fines

placed in 50m3

stockpiles pending

the results of

validation testing

Site Works –


Screened fines

placed in 50m3

stockpiles pending

the results of

validation testing

Site Works –



?

Frequent sampling of screened

soils was used to verify success

of strategy and demonstrate

compliance with waste disposal

requirements

Validation – Robin

Crowther

Validation / Verification


Elvanite provided a wide

range of documentation to

assist with the validation

reporting. This included:

Risk assessments

Method statements

A daily site diary

Haulage tickets

Waste disposal paperwork

Air monitoring reports

Validation / Site Visit 1






Construction starts on blank canvas

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Remediation of Asbestos Impacted Soils

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