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When Your Protection Fails….

Overdrilling CP

Not that kind of protection! We’re talking about cathodic protection of fuel pipes and tanks.

Decommissioning and replacing defunct cathodic protection ground beds requires an element of precision and brute force. Our first job is usually locating the existing beds. This can be no small task on a 30 hectare oil terminal site! The redundant beds were installed over 30 years ago and records are sparse.

We used radio detection methods to accurately locate the old redundant vertical ground beds to the required accuracy of +/-50mm. We need to be that accurate in order to successfully overdrill the beds.
Unusually, on our most recent project, our client asked us to drill through the connecting cables rather than removing them. The cables were isolated by a field engineer prior to us starting work and all our works were carried out under a permit to dig.
To overdrill the existing beds we brought in a shell and auger rig, drilling 350mm boreholes to 5m depth. This effectively decommissioned the existing redundant ground beds to make way for the new ones. With the first stage of the project complete, we are now back on site with our Comacchio rotary rig drilling much deeper boreholes in which we will be installing new anodes. Updates to follow.

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Emergency Response – Filling Station

We were recently contacted following a spillage of several hundred litres of diesel by a customer at a filling station in Northamptonshire. The diesel had entered the site’s drainage system, which ultimately discharged into a nearby area of wetlands.

We were on-site and our spill-response trailer within two hours of receiving the first call. We liaised with site staff, the Fire Brigade, tanker service contractors and the Environment Agency and co-ordinated thesubsequent clean-up, preventing any of the fuel reaching the wetland.

We subsequently collected soil and groundwater samples which were analysed by our in-house UKAS and MCerts accreditted laboratory, with results reported back to our client within 24 hours.

For more information about the emergency response services we offer, please contact James Edley – Tel: 01296 739412

 

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Big Old Tanks

USTsHave you ever wondered what is below your feet when you’re filling up at a petrol station? Big old tanks, that’s what! We’ve investigated the ground at more filling stations in the UK than anyone else and so, not surprisingly, we have a have a pretty detailed understanding of how they are put together. This sort of experience is invaluable when
it comes to assessing potential environmental risk – we know how and where problems
can occur…

Obviously owning our own specialist drilling systems, UKAS and MCerts accedited
laboratory and remediation equipment also has benefits, both in terms of cost and speed of turnaround.

For pragmatic advice and cost effective assessment strategies for the assessment
of filling station sites please contact James Skinner on 07770 611554.

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When You Need to Know Fast

Groundwater ProbingOur Geoprobe Drilling Systems offer something a little special when it comes to rapidly investigating a site. And when coupled with the fast turnaround from our UKAS and MCerts laboratory, our clients benefit from the best of all worlds.

We were asked to investigate a large industrial site that had a history of fuel contamination issues. The question was: how far had the contamination spread and was it migrating under the neighbouring properties. Our solution was to carry out a groundwater probing survey, comprising driving a re-useable probe into the ground to the underlying groundwater and then taking a sample of the groundwater for laboratory analysis.

We completed 54 probes in two days, accurately delineating the hydrocarbon plume. Forensic analysis of the samples by our laboratory then confirmed that there were three separate sources of the hydrocarbons, two of which were ongoing leaks, and not just the one known historic source.

We now know what the problems are, how far the contamination has spread and how to clean it up. Isn’t that better than endless phases of investigation last months and costing £££s.

Project value: £10-£15k

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Tight Access for Investigation

TerrierWe have recently completed an incident response investigation of a domestic heating oil installation located at the centre of a residential accommodation block complex in southern England. The site overlies chalk and is located just 100m from a public drinking water supply borehole.

Following complaints of possible oil contamination issues from the residents we took samples of the underlying soils and audited the fuel installation. With only footpaths leading to the tank installation we used our Terrier drilling system – which can fit through a standard doorway – to install boreholes either side of the oil tank and take soil samples for rapid analysis in our UKAS laboratory. Fortunately no significant soil contamination had occurred and our recommended improvements to the installation are now underway. The entire project, from initial enquiry instruction to report issue, was completed in under 4 days.

Project value ~£2k. Client value £££

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Groundwater Treatment at Major Airport

Airport Remediation
Groundwater Treatment in Place

We have recently been appointed to carry out long-term treatment to remove a range of contaminants, including Jet-A1, glycol and iron, from dewatering effluent at a major airport in southern England. Key to our success in winning the work was:

a) Our ability to deliver a modular treatment system that could be dismantled, moved and reassembled quickly and easily to suit construction activities;

b) Our in-house laboratory’s fast analysis turnaround ensuring early confirmation that discharge consent limits are not being exceeded.

For more information please contact James Skinner.

Contract Duration: 12-18 months      Contract value: £100-£250k

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When Things Get Tricky

Removing USTs with truss in foreground

Subadra have recently completed what has been, perhaps, our trickiest ever underground tank removal. The tanks at the former filling station were located close to the site boundary. Removing them might destabilise a Victorian house on the adjacent property. To prevent this a contiguous bored pile wall was installed together with a supporting steel truss. Our job was to safely ease the tanks out from under the truss without compromising its structural integrity, before cutting them up and disposing of them as scrap metal. All this on a crowded site with construction of the new structures well underway.

Contract Value £20-£50k

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Food Wholesaler/Distributor Retains Subadra

Subadra have been retained by a major food wholesaler/distributor to carry out a comprehensive audit/investigation of the fuel storage and supply infrastructure at a multi-site portfolio across the UK. Key to winning the contract was our ability to complete the project within a tight timescale. This is only possible because of our unique approach whereby every aspect of the project will be carried out using in house resources, from borehole drilling through to laboratory analysis; and, of course, our competitive rates!

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Subadra Awarded Multi-site Remediation Portfolio

We have been awarded a major remediation portfolio by one of the UK’s biggest fuel retailers. The multi-site portfolio will see us working at a sites across the UK using a wide variety of both in situ and ex situ remediation techniques. We understand that a key reason for us winning this work was our ability to provide cost-effective turnkey solutions, integrating site investigation, laboratory testing, fate-transport modelling and remediation design and implimentation using solely in house resources.

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Subadra Go Bananas

Replacement Pipework

We certainly get to work at a wide variety of different sites, but a call from a major banana distributor was a first even for us. The underground pipework carrying fuel to supply their trucks had failed and required urgent replacement. At short notice we were on site replacing the corroded steel pipework with modern plastic equivalents. We sampled the soil around the failed pipework and our in-house laboratory was able to confirm within 24 hours that no significant ground contamination had occurred. Within 36 hours the fuel supply system was back in commission and the banana trucks had started rolling again.