Sponder, Derby

October 2021

Ground Investigation to inform ground and ground water conditions for the design and construction of the main and associated infrastructure.

Site Work By Risk Management Ltd

Intrusive fieldwork consisted of 14 No. Rotary core boreholes, 14 No. Dynamic Cone penetration tests and land-borne gas monitoring.

Laboratory Testing By Lab Technician

Laboratory testing included Asbestos identification, pH and Sulphate tests, Soil contamination test and Contamination Test for Groundwater samples.

Rickmansworth, Hertfordshire

September 2021

Risk Management Limited were commissioned to undertake a Phase II Site Investigation to inform the design and demolition of existing buildings and construction of 6 new industrial units with external hardstanding.

Intrusive Fieldwork

Intrusive fieldwork consisted of 3 No. Cable percussion boreholes, 6 No. drive-in-sampler boreholes, 6 No. MEXE probe tests, 1 No. Mechanically excavated trail prit, BRE 365 test, infiltration soil test and land-borne gas monitoring.

Laboratory Testing

Laboratory testing included Natural moisture content tests, Atterberg tests, Quick undrained triaxial compression tests, Dynamic headspace analysis, Asbestos identification, pH and Sulphate tests, Soil contamination test and WAC tests.

West Norwood, London

August 2021

Risk Management Limited were commissioned to undertake a Phase II Site Investigation to inform the design and erection of a 2 No. blocks of 3-storey properties, including roof terraces with an attached commercial unit to one of the terraces with associated car parking.

Intrusive fieldwork consisted of 1 No. Light-percussion boreholes up to 12m depth, 4 No. drive-in-sampler boreholes, 6 No. dynamic probe tests, 1 No. falling head permeability test, land-borne gas monitoring and photoionization detector (PID) monitoring.

Laboratory testing included Natural moisture content tests, Atterberg tests, Quick undrained triaxial compression tests, Dynamic headspace analysis, Asbestos identification, pH and Sulphate tests, Soil contamination test and WAC tests.

Bourneside, Wentworth

August 2021

Risk Management Limited were employed to undertake a Phase II Site Investigation at an existing building to inform the design and erection of a detached, two-storey, replacement dwelling with basement served by a vehicular access ramp.

Intrusive fieldwork consisted of 3 No. cable percussion boreholes up to 20m depth, 2 No. Light-percussion boreholes up to 3.5m depth, 4 No. mechanically excavated Trial Pits, BRE365, soil infiltration tests, 4 No. MEXE probe test, 2 No. falling head permeability tests and land-borne gas monitoring.

Laboratory testing included Particle Size Distribution tests, Asbestos identification, pH and Sulphate tests and Soil contamination test and WAC tests.

Roebuck Retail Park, Stevenage

July 2021

Risk Management Limited were employed on behalf of Craddys to undertake a Phase I, Phase II Site Investigation at an existing retail park to inform the design and construction of additional units.

Intrusive fieldwork consisted of 4 No light-percussion boreholes up to 7m depth, 3 No. hand and mechanically excavated Trial Pits, 4 No. MEXE probe test, 2 No. falling head permeability tests and land-borne gas monitoring.

Laboratory testing was undertaken in line with the Consulting Engineers, specification and included Particle Size Distribution tests, Asbestos identification, pH and Sulphate tests and Soil and Groundwater Contamination tests.

Groundwater and gas monitoring was undertaken.

Sundon Reservoir, Bedfordshire

June 2021

Risk Management Limited were employed on behalf of Affinity Water to undertake a Phase II Site Investigation at an existing reservoir to inform the design and construction of a new water condition plant.

Intrusive fieldwork consisted of 6 No. drive-in-sampler boreholes up to 9m depth, 2 No. hand auger boreholes up to 2m depth, TRL Dynamic Cone Penetrometer (DCP) tests up to 1.20m depth, 2 No. Soil Resistivity tests using a Wenner 4-point array, 3 No. falling head permeability tests and dynamic headspace analysis for Volatile Organic Compounds (VOC’s) using a Photo-inonisation Detector (PID).

Laboratory testing was undertaken in line with the Consulting Engineers, Mott MacDonalds, specification and included Natural Moisture Content tests, Atterberg Limit tests, Particle Size Distribution tests, Resistivity, MCV, MCV-Moisture Content Relationship, Lab CBR tests, Organic Matter, Carbonate Content, pH and Sulphate tests and Soil and Groundwater Contamination tests.

Groundwater and gas monitoring was undertaken over 4 visits and included purging, micro-purging and sampling of groundwater using either dedicated bailers or a Peristaltic Pump and low flow cell.

Sparsholt, Hampshire

May 2021

Risk Management Limited were instructed to undertake a Phase I Desk Study/Tier 1 Preliminary Risk Assessment and a Phase II Site Investigation at an agricultural plot of land for the development of 7 No. low-rise residential buildings.

Intrusive fieldwork consisted of 2 No. light percussion boreholes, 5 No. drive-in-sampler boreholes, 4 No. CBR tests, 2 No. gas/groundwater monitoring installations and 1 No. full BRE 365 Soil Infiltration test.

Laboratory testing included pH and Sulphate tests, Contamination tests, Waste Acceptance Criteria (WAC) tests and Asbestos identification.

South Kilburn, London

April 2021

Risk Management Limited were commissioned by Brent Council to undertake a Phase I Desk Study/Tier 1 Preliminary Risk Assessment and a Phase II Intrusive Site Investigation in South Kilburn, London for the construction of 16 No. 4-story residential terraced buildings.

Prior to site works a detailed UXO Risk Assessment was obtained and subsequent on-site UXO support was provided. Intrusive fieldwork consisted of 2 No. cable percussion boreholes to 25m depth, 6 No. drive-in-sampler boreholes to 5m depth, 6 No. CBR tests, 2 No. hand excavated trial pits and 2 No. gas/groundwater monitoring installations.

Laboratory testing included Moisture Content tests, Atterberg Limits, Quick Undrained Triaxial tests, pH and Sulphate tests, Contamination tests, Waste Acceptance Criteria (WAC) tests and Asbestos identification.

Reporting encompassed conventional foundations, pile design parameters, land borne gas assessment, road pavement design and ground remediation.

Harefield Reservoir, Middlesex

April 2021

Risk Management Limited were employed on behalf of Affinity Water to undertake a Phase II Site Investigation at an existing reservoir in order to assess the geotechnical, geo-environmental, geological and hydrogeological ground conditions.

Intrusive fieldwork consisted of 1 No. cable percussion borehole to 25m depth, 4 No. drive-in-sampler boreholes to 6m depth and dynamic headspace analysis for Volatile Organic Compounds (VOC’s) using a Photo-inonisation Detector (PID).

Laboratory testing included Natural Moisture Content tests, Atterberg Limit tests, Quick Undrained Triaxial Strength tests, Particle Size Distribution tests, Incremental Loading Oedometer tests, Organic Matter, pH and Sulphate tests, Soil and Groundwater Contamination tests and Soil Derived Leachate Suites and compliance tests for solid waste.

Groundwater and gas monitoring was undertaken over 6 visits and included purging, micro-purging and sampling of groundwater using either dedicated bailers or a Peristaltic Pump and low flow cell.

Oxhey Woods Reservoir, Middlesex

March 2021

Risk Management Limited were employed on behalf of Affinity Water to undertake a Phase II Site Investigation at an existing reservoir in order to assess the geotechnical, geo-environmental, geological and hydrogeological ground conditions.

Intrusive fieldwork consisted of 2 No. cable percussion boreholes to 15m and 25m depth, 3 No. drive-in-sampler boreholes to 6m depth and dynamic headspace analysis for Volatile Organic Compounds (VOC’s) using a Photo-inonisation Detector (PID).

Laboratory testing included Natural Moisture Content tests, Atterberg Limit tests, Quick Undrained Triaxial Strength tests, Particle Size Distribution tests, Incremental Loading Oedometer tests, Organic Matter, pH and Sulphate tests, Soil and Groundwater Contamination tests and Soil Derived Leachate Suites and compliance tests for solid waste.

Groundwater and gas monitoring was undertaken over 6 visits and included purging, micro-purging and sampling of groundwater using either dedicated bailers or a Peristaltic Pump and low flow cell.

Cullompton, Devon

March 2021

Risk Management Limited were instructed to undertake a Phase I Desk Study/Tier 1 Preliminary Risk Assessment and a Phase II Site Investigation at a parcel of land for the development of Cricket, Hockey, Tennis and Petanque pitches in Cullompton, Devon.

Intrusive fieldwork consisted of 7 No. light percussion boreholes, 3 No. CBR tests, 4 No. gas/groundwater monitoring installations and 2 No. full BRE 365 Soil Infiltration tests.

Laboratory testing included natural moisture content tests, Atterberg Limit tests, Quick Undrained Triaxial Strength tests, pH and Sulphate tests, Contamination tests, Waste Acceptance Criteria (WAC) tests and Asbestos identification.

Poole, Dorset

February 2021

Risk Management Limited were initially employed in January 2020 to undertake a Phase I Desk Study/Tier 1 Preliminary Risk Assessment and Phase II Intrusive Contamination Assessment at the former site of HMRC offices in Poole, Dorset. Following this RML were again employed in February 2021 to undertake two deep cable percussion boreholes to enable pile design and undertake gas monitoring.

Two 25m deep cable percussion boreholes were drilled at the site using a Dando 4000 rig, with in-situ SPT tests undertaken along with the retrieval of undisturbed U4/U100 samples for subsequent laboratory testing.

Laboratory testing included, Moisture Contents, Atterberg Limits, Undrained Triaxial Compression Tests, pH and Sulphate tests.

Littlehampton, West Sussex

January 2021

Risk Management Limited were employed to undertake winter groundwater monitoring at a site in Littlehampton, West Sussex for a furfure residential development.

A total of 12 No. drive-in-sampler boreholes were undertaken across the site to a depth of 5m and groundwater monitoring standpipes installed.

Groundwater monitoring visits were then subsequently undertaken fortnightly from January 2021 up until March 2021.

In April 2021 RML were then commissioned to undertake 12 No. BRE 365 Soil Infiltration tests across the site. In November 2021 RML were then commissioned to undertake further groundwater monitoring and Falling Head Permeability tests within the borehole installations.

Southampton, Hampshire

December 2020

Risk Management Limited were instructed to undertake a Phase I Desk Study/Tier 1 Preliminary Risk Assessment and a Phase II Site Investigation at The National Oceanography Centre in Southampton for the proposed erection of PV Panel Car Ports to external car parking areas.

Prior to intrusive fieldwork a Preliminary UXO Threat Assessment was undertaken and assessed a ‘high’ risk level to UXO at the site. Intrusive fieldwork was therefore overseen by a UXO specialist during drilling of 2 No. light percussion to 5m depth. A downhole magnetometer was used to ‘clear’ each 1m below drill depth before boring was continued.

Laboratory testing included Moisture Content tests, Atterberg Limits, Quick Undrained Triaxial tests, Particle Size Distribution tests, pH and Sulphate tests, Contamination tests and Asbestos identification.

Mitcham, Surrey

November 2020

Risk Management Limited were instructed to undertake a Phase I Desk Study/Tier 1 Preliminary Risk Assessment and a Phase II Site Investigation at a former rag & metal merchants in Mitcham, Surrey for the redevelopment into 25 self-contained residential units.

Intrusive fieldwork consisted of 2 No. cable percussion boreholes to 20m depth, 6 No. drive-in-sampler boreholes to 3m depth, 6 No. CBR tests and 1 No. gas/groundwater monitoring installation.

Laboratory testing included Moisture Content tests, Atterberg Limits, Quick Undrained Triaxial tests, pH and Sulphate tests, Contamination tests, Waste Acceptance Criteria (WAC) tests and Asbestos identification.

Reporting encompassed conventional foundations, pile design parameters, land borne gas assessment, road pavement design and ground remediation.

Hunstanton, Norfolk

October 2020

Risk Management Limited were employed to undertake a Phase I Desk Study/Tier 1 Preliminary Risk Assessment and a Phase II Site Investigation at a former infant school in Hunstanton, Norfolk for the redevelopment into residential accommodation.

Intrusive fieldwork consisted of 1 No. cable percussion borehole, 4 No. light percussion boreholes, 4 No. CBR tests, 2 No. wall cores, 4 No. hand excavated trial pits, 1 No. gas/groundwater monitoring installation and a full BRE 365 Soil Infiltration test.

Laboratory testing included pH and Sulphate tests, Contamination tests and Asbestos identification.

Mottingham, London

September 2020

Risk Management Limited were commissioned to undertake a Phase I Desk Study/Tier 1 Preliminary Risk Assessment and a Phase II Intrusive Site Investigation in Mottingham, London for the construction of a part 5-story part 6-storey residential building.

One 30m deep cable percussion borehole was drilled at the site using a Dando 4000 rig, with in-situ SPT tests undertaken along with the retrieval of undisturbed U4/U100 samples for subsequent laboratory testing and a gas/groundwater standpipe installed. Additional mechanically excavated trial pits were also undertaken across the site to confirm the geology.

Laboratory testing included, Moisture Contents, Atterberg Limits, Undrained Triaxial Compression Tests, Particle Size Distribution tests, pH and Sulphate tests, contamination tests, Waste Acceptance Criteria (WAC) tests and asbestos identification.

Pile design parameters, ground remediation and a landborne gas assessment were reported.

Welwyn, Hertfordshire

August 2020

Risk Management Limited were instructed to undertake an intrusive site investigation across an Industrial Estate in Welwyn, Hertfordshire in order to assess the ground conditions due to excessive movement in the road surfacing.

3 No. light percussion boreholes up to 5m deep, 10 No. Dynamic Probe tests up to 10m deep and 10 No. MEXE Probe CBR tests were undertaken across the site.

Laboratory testing included Particle Size Distribution tests.

Sonning, Berkshire

July 2020

Risk Management Limited were instructed to undertake a Phase I Desk Study/Tier 1 Preliminary Risk Assessment and a Phase II Site Investigation at a residential property in Sonning, Berkshire.

Intrusive fieldwork consisted of 4 No. light percussion boreholes up to 7m deep, 4 No. CBR tests, 3 No. gas/groundwater monitoring installations, 3 No. falling head permeability tests and a full BRE 365 Soil Infiltration test.

Laboratory testing included, Particle Size Distribution tests, pH and Sulphate tests, Contamination tests and Asbestos tests.

Penge, London

June 2020

Risk Management Limited were employed to undertake a Phase II Site Investigation to assess potential heave and enable new foundations for a side and rear extension to be designed by others.

Intrusive work included a 10m deep light percussion borehole with in-situ SPT tests. Laboratory testing included, Moisture Contents and Atterberg Limits.

A heave assessment in line with BRE Digest 412 was undertaken at the site along with the provision of allowable bearing pressures.

Chessington, Surrey

May 2020

Risk Management Limited were instructed in May 2020 to undertake an intrusive soil investigation to provide information to allow the Consulting Engineer to assess reasons for subsidence at a warehouse unit in Chessington, Surrey.

The investigation comprised of 4 No. Light Percussion boreholes up to a depth of 8.00m below existing ground level, 2 No. concrete cores, 2 No. drive-in-sampler boreholes, 2 No. mechanically excavated trial pits and 1 No. hand excavated trial pit.

Following retrieval of soil samples from the boreholes a heave assessment and desiccation analysis from moisture content tests and Atterberg Limit tests were undertaken along with filter paper suction tests and Quick Undrained Triaxial tests.

Blackford to Ickenham

April 2020

In April 2020 Risk Management Limited were instructed by Affinity Water to undertake an intrusive soil investigation to determine the proposed route for a 700mm diameter mains between Blackford Booster and Ickenham Booster. The project was part of a larger 20-year investment programme named Supply 2040

A total of 22 No. boreholes were drilled along 3 proposed linear routes for the mains pipeline using a tracked window sampler rig. Boreholes were drilled to depths of between 2.00m and 10.00m below existing ground level.

A large area of the site comprised a former Landfill and in addition to geotechnical testing on samples recovered to aid sub-structure foundation advice, numerous contamination and waste acceptance criteria (WAC) tests were scheduled to provide information to assist in the best possible route for the mains pipe.

Bletchingley, Surrey

March 2020

Risk Management Limited were instructed to undertake BRE 365 soakage tests and CBR testing at a playground in Bletchingley, Surrey in March 2020.

A total of 2 No. full BRE 365 soakage tests were undertaken using a mini-excavator and 2000 gallon lorry mounted water bowser in order to provide a soil infiltration rate.

4 No. MEXE Probe CBR tests were also undertaken for the purposes of road pavement design.

River Stour, Sandwich

February 2020

Risk Management Limited were commissioned to undertake a borehole investigation in February 2020 either side of the River Stour in Sandwich for a proposed new pipeline crossing.

A total of 6 No. Light Percussion boreholes were drilled up to a depth of 14m with in-situ SPT testing.

Laboratory testing included, Moisture Contents, Atterberg Limits, Undrained Triaxial Compression Tests, Particle Size Distributions, pH and Sulphate tests, Contamination testing of soil and groundwater and Asbestos identification.

Petersfield, Hampshire

January 2020

Risk Management Limited were instructed in January 2020 to undertake both a Phase I Desk Study and a Phase II Intrusive Site Investigation for a proposed residential ‘extra care’ facility and a ‘day-care’ centre in Petersfield, Hampshire.

The Site Investigation included 10 No. Light Percussion boreholes across the site along with subsequent land-borne gas monitoring in standpipe installations.

Laboratory testing included, Moisture Contents, Atterberg Limits, Undrained Triaxial Compression Tests, Particle Size Distributions, pH and Sulphate tests, Contamination testing and Asbestos identification.

Kentish Town, London

December 2019

Risk Management Limited were initially employed in June 2015 to undertake a Preliminary Contamination Assessment at a former coachworks and vehicle repair garage in Kentish Town, London. RML were subsequently employed to undertake an additional Contamination Assessment to provide further information.

Seven drive-in-sampler boreholes with concrete coring were undertaken in order to install gas/groundwater monitoring standpipes, collect samples for contamination testing and further characterise the soil conditions on site.

Dynamic Headspace Analysis was undertaken using a Photoionisation Detector (PID). Groundwater analysis was undertaken using an interface probe, peristaltic pump and a multi-parameter water quality meter.

Retail Park, Coventry

November 2019

Risk Management Limited were commissioned to undertake a Warehouse Slab Investigation at a Retail Park in Coventry.

Prior to any intrusive work a UXO assessment found the site to be high risk from unexploded ordnance and consequently on-site support from UXO Specialists were employed during the work.

The project consisted of five cores through the concrete slab in 83mm diameter recovering cores of approximately 75mm in diameter. Following coring boreholes were sunk at two locations using a Premier tracked drive-in-sampler rig to ascertain the make-up beneath the slab.

During the borehole works the UXO specialist cleared each metre prior to drilling using a down-hole magnetometer.

Eel Pie Island, Twickenham

October 2019

Risk Management Limited were instructed to undertake a simple site investigation at a property located on Eel Pie Island located in the River Thames at Twickenham.

The work involved hand excavating four Trial Pits to determine foundation depths of concrete columns and a timber extension. The work was completed in one day with the Trial Pits photographed, logged, backfilled and reinstated.

Limehouse Cut

September 2019

Risk Management Limited were commissioned to undertake Trial Pits against existing foundations at basement and ground floor level across a Grade II listed warehouse in Limehouse Cut.

The work involved undertaking twenty-three hand excavated Trial Pits, assisted by a mini-excavator with breaker at certain locations, to find column/pad undersides. Trial Pits were logged, photographed before backfilling and reinstating as per the existing make-up.

In addition 3 No. concrete cores were undertaken across the site to assess the slab structure.

Romsey, Hampshire

August 2019

Risk Management Limited were employed to undertake both a Phase I, non-intrusive, Desk Study and a Phase II, intrusive, Site Investigation at a large parcel of land in Romsey, Hampshire.

The work involved thirteen light percussion boreholes, thirteen MEXE Probe CBR tests and twenty-two Soil Infiltration Tests. Falling head permeability tests and land -borne gas monitoring completed the fieldwork.

Comprehensive geotechnical and contamination testing were scheduled to provide allowable bearing pressures and advice for the remediation of the site.

Whitehawk Bus Depot, Brighton

July 2019

Risk Management Limited were commissioned by Derek Lofty & Associates to provide information on the existing slab and sub-soil conditions at Whitehawk Bus Depot in Brighton.

The investigation consisted of a number of concrete cores through the existing slab to note the overall depth of concrete and presence and size of reinforcement. Unconfined compression tests were subsequently undertaken on the cores retrieved to determine the core strength.

In addition to the slab assessment, three boreholes were sunk through the aforementioned cores to determine the underlying soil conditions and two hand excavated trial pits to assess the existing foundation make-up and depth. Contamination and Asbestos identification were also undertaken.

Brixton, South London

June 2019

Risk Management Limited were employed to undertake intrusive work at a Primary School in Brixton, South London to provide the Consulting Engineers, Pellings LLP, information on the existing structure.

The work consisted of six hand excavated trial pits against existing walls to uncover the foundation make up, dimensions and depth to underside. Furthermore, the internal walls and roof structure of the building were opened up in six areas to ascertain the make-up.

Winchester, Hampshire

May 2019

Risk Management Limited were employed by local house building company Alfred Homes to undertake a full BRE 365 Soil Infiltration Test at a property in the village of Weeke, Winchester.

A 3 ton mini excavator was utilised owing to the access restraints to dig a trench to 2.70m depth, with sides and base kept as straight as possible. The trench was then measured and the strata photographed and logged before filling using a 2000 gallon lorry mounted bowser. The rate of fall was then used to calculate a Soil Infiltration Rate (f) which facilitates drainage design by others.

Chesham, Buckinghamshire

April 2019

Risk Management Limited were commissioned to install 2 No. deep borehole Soakaway installations for a new care home in Chesham, Buckinghamshire. 

The work involved undertaking two 15m deep cable percussion borehole in 8” diameter through the superficial beds and into the underlying Chalk strata. After a basic permeability test two 6” diameter soakaways were subsequently installed to 15m depth within each borehole. 

Following installation three falling head tests within each soakaway were performed using a 2000-gallon lorry mounted bowser and hose and more than adequate soakage was observed. 

Merton, Surrey

March 2019

Risk Management Limited were commissioned to undertake a Phase II, intrusive, Site Investigation at an existing Warehouse in Merton, Surrey. The investigation comprised verification of the existing slab condition and surrounding ground conditions for a small Barrier Booth building adjacent to the warehouse. 

A concrete coring crew were subcontracted to core the existing warehouse slab in multiple locations with the resultant cores scheduled for Unconfined Compressive Strength testing. Drive-in-Sampler boreholes and MEXE Probe CBR tests were undertaken within the above-mentioned core holes to enable foundation design parameters. 

Ashby-De-La-Zouch, Leicestershire

February 2019

Risk Management Limited were instructed to undertake a Land-Borne Gas Risk Assessment requested by North West Leicestershire District Council at a site of a former open-cast mine in Ashby-De-La-Zouch.

The work involved monitoring a number of gas standpipes, installed by RML across the site, at two-weekly intervals over a period of 18 weeks. Concentrations of Carbon Dioxide, Oxygen, Methane, Hydrogen Sulphide and gas flow were measured along with Volatile Organic Compounds (VOC’s).

Ashford, Kent

January 2019

Risk Management Limited were commissioned to undertake a Phase II Site Investigation at a parcel of land in Ashford, Kent for a proposed Extra Care Facility.

The underlying geology of Weald Clay can be difficult to penetrate with standard drive-in-sampler/window sampler techniques and consequently Cable Percussion techniques were employed to achieve the required 15m depth.

In addition to geotechnical testing and Waste Acceptance Criteria (WAC) tests, a full BRE 365 Soil Infiltration Test was also undertaken to inform drainage design and assess the capability of the underlying ground for potential soakaways.

Marketfield Way, Redhill

December 2018

Risk Management Limited were instructed to undertake a Phase I Desk Study and Phase II Site Investigation at a parcel of land adjacent to Redhill Train Station for a proposed multi-story residential development in the heart of Redhill town centre.

The underlying geology in Redhill, of the Sandgate Formation, required RML to employ Rotary drilling techniques in order to penetrate the sandstone to the required depth.

A comprehensive suite of both geotechnical and chemical tests were undertaken to inform the developer of foundation design parameters and environmental requirements for the site.

Tonbridge, Kent

November 2018

Risk Management Limited were commissioned by WCJ Structural Engineers to undertake a ‘heave assessment’ at a property in Tonbridge, Kent. 

Due to excessive cracking on the property an 8m deep borehole was undertaken close to the area of interest. A moisture content profile was undertaken and, by comparing this to assumed ‘equilibrium’ natural moisture contents, a Heave Assessment was undertaken. 

Sutton, Surrey

October 2018

Risk Management Limited work regularly with many local developers who often instruct us to undertake a ‘package’ consisting of a Phase I, non-intrusive, Desk Study and Phase II, intrusive, Site Investigation with contamination assessment, gas/groundwater monitoring and an Interpretative Report. 

This package was utilised at a site in Sutton, Surrey, where the intrusive investigation comprised one 7m deep borehole with in-situ SPT testing and 3 shallow drive-in-sampler boreholes. Subsequent permeability, gas/groundwater monitoring was undertaken along with two contamination tests including asbestos. 

Gladstone Parade, Dollis Hill, London

September 2018

Risk Management Limited were commissioned to undertake a Phase I, non-intrusive, Desk Study and Walkover Survey together with a Phase II, intrusive, Site Investigation at a parade of shops in Dollis Hill, London. The proposed development included the demolition of existing buildings and garages and the construction of a multi-storey building with associated landscaping and parking areas.

Two 20m deep cable percussion boreholes and six shallow drive-in-sampler boreholes were undertaken across the site to aid in providing geotechnical information. In addition, soakage tests to BRE 365 were undertaken to assess the soakage properties of the underlying geological strata and gas/groundwater monitoring performed.

Laboratory testing included the normal geotechnical testing as well as Oedometer tests and Contamination and Waste Acceptance Criteria (WAC) testing.

Pear Tree Street, London

August 2018

Risk Management Limited were commissioned to undertake a Phase I, non-intrusive, Desk Study and Walkover Survey and Phase II, intrusive, Site Investigation at an existing National Grid Car Park. The Phase I, non-intrusive, Desk Study found that the site lay within the boundary of the ‘Chartered Gas Works’ in 1877, by the end of the nineteenth Century the majority of the Gas Works had been removed.

A four to five storey office/residential building was proposed at the site. Due to the past usage of the site as a Gas Works the site was designated a ‘Red Site’ in accordance with the ‘Specification for Ground Investigation’ publications by the Site Investigation Steering Group of the ICE. 

A total of three deep cable percussion boreholes and six shallow drive-in-sampler boreholes were undertaken across the site to provide suitable information to allow for foundation design. Subsequent gas/groundwater monitoring was undertaken on six occasions along with organics measured using a MiniRae Lite PID. 

Laboratory testing included the normal geotechnical testing as well as Coal Tar, SVOC and TOC analysis and groundwater contamination testing owing to the past usage. 

Following on from the Phase I and II work noted above a Phase III Remediation Method Statement and Phase IV Verification Report were undertaken. 

Childrey Warren, Wantage

July 2018

Risk Management Limited were contracted to undertake an intrusive Site Investigation along the linear route for a new watermain running from Childrey Warren Water Treatment Works (WTW) to Lark Hill Reservoir for Thames Water. Thames Water are committed to ceasing water abstraction at Childrey Warren WTW and the proposal to construct a link main between Lark Hill Reservoir and Childrey Warren WTW would allow this.

A total of fifteen geotechnical Trial Pits were undertaken using a Kubota mini-excavator and eight Rotary Cored boreholes, up to 25m deep, using a tracked Commachio 250 drilling rig at locations along the proposed link main route.

Laboratory testing included, moisture contents, Atterberg Limits, CBR tests, Compaction tests, pH and Water Soluble Sulphate tests, Saturation Moisture Content, Chalk Crushing Value, Natural Moisture Content of Chalk, Unconfined Compressive Strength and Point Load Index of Chalk and Contamination testing.

Melior Place, London

June 2018

Risk Management Limited were contracted to undertake a Phase II, intrusive, Site Investigation at a warehouse unit in Southwark, London. The scope for the investigation required a deep borehole to at least 20m depth to enable foundation and pile design. 

Considering the limited headroom and access difficulties Risk Management Limited utilised a low-headroom ‘cut-down’ cable percussion rig in order to achieve the required depth. The ‘cut-down’ rig is ideal in environments where depths in excess of 10m are required, or tough ground conditions require a cable percussion rig, and headroom is limited. 

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