25 Years of Intégrale

  • 2015 – Remediating Historic Mill Complex (10/2/2019)

    Freshford Mill, Bath

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    Remediation work stopped at this site in 2008 when the previous developers went into liquidation.  Integrale completed supplementary validation investigation and co-ordinated specialist groundwater remediation of the remnant hydrocarbon plume, design of new soils cover and hotspot clearance to help realise the full potential of this beautiful riverside location.

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  • 2014 – Delivering Rapid Advice (10/2/2019)

    Wroughton Airfield Solar Park

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    One of the largest renewable energy facilities (50 MW) in the UK, it has been in development since 2012; Intégrale completed the Geo Desk Study and Environmental Impact Statement in 2013. Being in an AONB, English Heritage objected, and planning was delayed until March 2015.

    Intégrale rapidly completed the Ground Investigation and Remedial Method Statement by mid-summer allowing completion of the c. 90 acres of photovoltaic arrays by March 2016, generating enough power for 15,000+ homes.

  • 2013 – Presenting Hydro and Enviro Advice, Asbestos Landfill (10/2/2019)

    Advising Stowey Sutton Action Group (SSAG)

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    At Intégrale, we take our professional responsibility and knowledge very seriously……. to the extent that we are willing to work…gratis…. for local action groups with valid concerns.

    This quarry, located adjacent to Chew Valley Lake, has been a site of contention for six years, when permission was granted for asbestos disposal. Residents, supported by Intégrale, gained national attention through a series of high-profile appeals.

    In 2013, the Planning Inspector ruled that the quarry could not be used as landfill for stable non-reactive hazardous waste; it posed a risk to residents and the reservoir. SSAG have monitored the quarry since and raised suspicions about the waste arriving. In late 2016, the Environment Agency suspended the permit for even controlled waste disposal .

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  • 2012 – Founding New Buildings on Gulled Strata (10/2/2019)

    University of Bath and University of Bristol

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    Both University campuses pose inherent foundation difficulties, demonstrated by more than 20 specific projects completed by Intégrale. The University of Bristol dominates a hillside formed of interbedded sandstone and mudstone, with an unfavourable bedding dip! Stabilisation frequently requires shear-key piles and ground anchors.

    The University of Bath, at the crest of a plateau overlooking an unstable hillside, suffers from cambered and gulled limestone. Site specific ground conditions often require plain slab/stiffened edge rafts, not needing a high degree of stiffness. Slab and beam/piled rafts can be appropriate at more artificial locations.

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  • 2011 – Developing Unusual Foundations (10/2/2019)

    Legoland 4, Gunzberg, Germany

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    Assessing ground investigations, then optimising appropriate foundations for theme park rides and entertainment facilities with unusual static and dynamic spatial loading.  Advising on extent of lime and cement stabilisation of largest WWII former armaments and ordnance storage complex, concurrent with UXO clearance operations.

  • 2010 – Maintaining Ongoing Stability (10/2/2019)

    Ulwell Reservoir, Swanage

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    Access to this elevated site is extremely difficult. Signs of superficial slippage in 2000, triggered boreholes investigation and slope analysis; could there be a catastrophic leakage of water? Should the site be abandoned and relocated? An older reservoir at a lower elevation had been demolished.

    We concluded the reservoir was securely founded into Chalk. There was no significant risk of global instability, but the buried concrete structure could become locally exposed.

    Reinvestigation in 2012 reached the same conclusion. A programme of localised stability works including ground improvement, soil nailing and drainage, was recommended.

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  • 2009 – Generating Structural Stability (10/2/2019)

    Brimscombe, Stroud, Gloucestershire

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    Access to two new houses needed a road in a 3-4m cutting that truncated an old mudslide. Initial investigations by others had resulted in a tragic fatality with Health and Safety lessons for the complete ground engineering industry.

    Intégrale’s boreholes revealed a complex Quaternary geology, defining ancient landslips and mudsliding. We completed parametric slope stability analyses and liased with a bored pile contractor to establish a technically and cost effective system of vertical, contiguous bored pile walling. Raking piles were included to resist horizontal loading and overturning.

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  • 2008 – Designing Dredged Sideslopes (10/2/2019)

    Ras Tanura, Saudi Arabia

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    Saudi Aramco completed an approach channel, new berths and breakwaters for the Integrated Project.  Integrale provided advice on rock excavation, soils suitability for hydraulic filling and designed the slopes for the navigation channel, including seismic assessment.

  • 2007 – Approving Quarry Face Foundations (10/2/2019)

    Portland and Bath Stone Quarries

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    The Isle of Portland’s industrial legacy results in ubiquitous old quarries, landfills and coastal instability.  Inevitably the upmarket transformation involves complex special foundations, appropriate soils: gas measurements and remediation of contamination. Most Bath Stone quarries are hidden, having been backfilled, but careful study of old maps reveals their former locations. Trial trenching and liberal scatter of rotary-percussive probes define their depth, and backfill. Organic or contaminated waste is relatively rare. If ‘gulled’, fractured bedrock is anticipated, rafts supported by vibro stone columns may be preferred to piles alone.

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  • 2006 – Producing Successful Soils Gas Remediation (10/2/2019)

    Council Tip Redevelopment, Hampshire

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    25 controversial new houses, alongside protected Stanpit Marsh Nature Reserve near Christchurch, had to maintain the integrity of a precious SSSI buffer strip and wildlife corridor, demanded by planners.

    Following multi-phase investigation, Intégrale designed remediation to ensure remnant methane and noxious gases are safely vented through external pavements and prevented from entering new homes; a cover system protects occupants from contaminated fills. A 5-year monitoring programme was successfully completed following occupation.

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  • 2005 – Eliminating Inherent Instability (10/2/2019)

    Park Row, Clifton, Bristol

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    Two neighbouring redevelopment sites straddle a steep hillside slope, with documented historic instability.

    The Panoramic reused the rectangular 1960’s ‘Barrette’ piled foundations, which take large axial loads and high moments. Intégrale’s stability assessment demanded additional, small diameter-high capacity drilled piles to increase the factor of safety, for 7 storey apartments.

    The 5-storey Level Club next door, was extended out over the slope, being converted to student accommodation. This also required drilled piles to support the new vertical loads, plus rock anchors and upgraded retaining wall, to provide adequate horizontal restoring force.

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  • 2004 – Researching Groundwater Potential (10/2/2019)

    The Palm, Jumeirah, Dubai

    Leading world developer Nakheel Properties is realising the vision of Dubai for the 21st century.   Integrale researched potential groundwater abstraction from beneath a 6km diameter hydraulic fill land reclamation.  Conventional seawater intake and brine discharge could be at risk from accidental tanker oil spillage. Sophisticated pumping tests concluded groundwater recharge was too slow for The Palm Island requirements.

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  • 2003 – Planning Cliff Revetment (10/2/2019)

    Capstone Hill, Ilfracombe

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    Rockfalls necessitated this exposed coastal footpath being closed. Assessment required both abseil and hydraulic platform access. Rock Mass categorisation allowed comparison of various remedial options. A rockfall canopy was cheapest but rejected on aesthetic grounds. The visually non-intrusive scheme implemented comprises bolted netting, anchored dental masonry and ‘catch’ fencing.

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  • 2002 – Anticipating Coastal Landslips (10/2/2019)

    Culbone Woods, Exmoor Coast

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    Geotechnical mapping of 200 hectares provided base map for future instability predictions. Simple movement monitors installed at 50 locations allowed the National Park staff to relocate public footpaths in advance of slope failure. Hedge plashing, coppicing and other traditional techniques provided stability and materials for check fencing for rolling boulders.

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  • 2001 – Streamlining Pile Design (10/2/2019)

    Birmingham City Centre

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    Full-time supervision of mini-piling and ongoing pile capacity assessment and requirements, enabled the most technically and cost-effective support of complex scaffolding temporary works to support the brittle façade of this Colmore Row former bank, with multiple existing vaults.

  • 2000 – Evaluating Contamination (10/2/2019)

    Hunsworth, Yorkshire

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    Following complex and heavy contamination since 1800, Coates Viyella commissioned in-depth investigations and assessment of this 8 hectare dyeworks from both geo-environmental and geotechnical viewpoints.  Appropriate advice provided for sales particulars.

  • 1999 – Developing Cliff Stability (10/2/2019)

    Lezardrieux, Brittany, France

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    A group of British families had developed a property alongside the Trieux estuary, where the rock cliff was degrading.  Their new swimming pool was threatened, necessitating cost effective stability works, in keeping with the protected Cote de Granit Rose location and to the requirements of the French maritime regulators.

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  • 1998 – Auditing Geotechnical Risk (10/2/2019)

    Hsin Hsin, Lukang, Taiwan

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    Accomplished full geotechnical audit for offshore land reclamation of three new industrial islands in typhoon threatened zone.  Including potential long-term consolidation of hydraulic filling, and threat of storm surges breaching reclamation before rock-armour placement complete.  Assessed landslip that destroyed access road for rock-armour quarry in mountainous interior.

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  • 1997 – Designing Road Geotechnics (10/2/2019)

    Peasedown St John Bypass, Bath

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    Directing full investigations for 5km bypass with disturbed and landslipped Jurassic soils and rocks. Expediting most cost effective geotechnical remedial works, dealing with cambered and gulled limestone, and bank stability. No positive drainage, requiring appropriate location for large-scale soakaway drainage.

  • 1996 – Engineering Tropical Soils (10/2/2019)

    Power Station, St Lucia, Windward Islands

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    Non-engineered back-filling of a tropical valley was investigated between 1988-91 for the new Cul-de-Sac power station and substations.

    Following detailed seismic risk and reciprocating vibrations assessment, compaction by vibro-replacement was chosen, supervised and a stiff foundation raft constructed. Recent hillside instability was analysed and the critical area of the main landslip was stabilised with cut-off and herringbone drains and counterforts.

  • 1995 – Stabilising Stone Mines (10/2/2019)

    Combe Down, Bath

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    In 1988-89 open-cast quarries and shallow stone mines at The Brow were investigated by trenching and rock probing for several large detached houses.  Successful stabilisation was achieved by jack-hammering out the thin roof cover, crushing the rocky spoil and consolidating with vibro-replacement stone columns.  Raft foundations were subsequently adopted.

    Ref: GG Thomas (1987) Cost Benefit Analysis for Stabilising Shallow Bath Stone Mines.

  • 1994 – Implementing Cliff Works (10/2/2019)

    Newquay, Cornwall

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    Co-ordinating geotechnical aspects of Cliff Road leisure centre redevelopment at cliff top, with 5m back cantilever, between 1987-1992.

    Managing cliff stability works for Restormel Borough Council, including unstable rock anchoring, break-up and removal, and constructing reinforced, drained, sprayed concrete protection.

    Return visits in 2000, 2008, and 2015 to confirm ongoing stability as building usage changed, and adequate forward design life.

  • 1993 – Controlling Investigation Quality (10/2/2019)

    GSZ Superhighway, Southern China

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    Developing appropriate linkage between British Standard ground investigation techniques and equipment and the equivalent available Chinese methodologies.  Completing detailed rock core assessment at bridge pier locations, interpreting geological profiles and conceiving likely pile design criteria.