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Case Study 1
Domestic Property, Northern Ireland
Our client was a domestic home owner who had ordered a fill of home heating oil (kerosene) to their oil storage tank. During the delivery, the oil line became detached which resulted in the discharge of a large volume of kerosene over the rear lawn.
The topological gradient was such that the spill was making its way towards the dwelling house posing a significant risk to both the structure and the ocupants.
Avada attended and identified the immediate hazard and the need for urgent containment measures. An emergency containment trench was installed to safeguard impaction of the dwelling. This was then followed by a comprehensive contamination assessment and remediation restoring the amenity of the property to pre-loss condition.
Case Study 2
Our client was a large property developer involved in the construction of a portfolio of apartment blocks on land previously occupied by a gasworks.
During the purchase of the land, the vendor indicated the possibility of residual contamination.
Avada was retained with investigating the land and if contamination was identied, preparing and costing of options to bring the land to a standard suitable for the client’s intended use.
Avada initially undertook a desk study of the site and identied likely sources prior to undertaking further investigations. In addition, a basic conceptual model was created and investigation objectives were decided.
The intrusive site investigation works included sampling of both soils and groundwater. A number of contaminants of concern were identied which included Arsenic, Cyanide, Chromium VI, Lead, Vanadium and PAHs.
We considered a number of remedial options including excavation, stabilisation and capping. A hybrid strategy was determined to be the most environmentally sustainable which involved an element of excavation of the upper horizons of soils, followed by capping.
We worked with the developer to create method statements and risk assessments prior to the undertaking of remedial works. Following this we undertook the nal site validation and provided the client with the necessary certications for him to continue with the build.
Case Study 3
Derilect Industrial Mill, England
Our client was developing a site for 35 new residential properties. The site had signicant contamination as a result of historic land use. The derelict buildings on the site had previously been occupied by a variety industries including a ax mill in the 1800s, an ironfoundry in the early 1900s, a munitions foundry during the 2nd World War producing bombs and torpedo parts and then in later years the processing of milk products.
Avada was tasked with reviewing and advising of possible measures necessary to bring the site to a residual contamination level suitable for the intended use.
Investigations on the site identied a number of contaminants of concern including Metals, TPH, PAH, PCBs, BTEX, MTBE, total and free Cyanide, thyocyanate, VOCs, SVOCs, phenols, sulphides and asbestos causing signicant risks to human health and controlled waters.
Due to the proximity of watercourses, Avada deemed the site “highly sensitive”.
We advised the client on the relevant legislative environmental framework, the Health and Safety measures for construction workers including PPE, RPE and induction talks.
Case Study 4
Our client is an international public company working in the utilities sector. One of the client’s divisions was as an installer and maintainer of large scale windfarms. The nacelle of a wind turbine often contains many hundreds of litres of gearbox oil (a lower base oil).
Our client had a need for advice on producton of Oil Spill Contingency Plans (OSCPs) which are often key to both combatting a spill eectively and obtaining an operating licence.
In addition, our client had a need for second-tier response in the event of an incident.
Avada provided the client with contingency planning support using a systematic approach to exploring what can go wrong and the steps that need to be undertaken in an emergency situation.
We identied contingencies through a risk assessment process and showed the strategies needed to avoid or cope with them. Our approach found and assessed oil spill risks, helping to ensure the correct arrangements were in place to manage spills.
Shortly after provision of consultancy advice, the brakes of a turbine unit at one of the client’s installations failed leading to a gearbox overspeed resulting in catastrophic failure of the unit. Nearly 500
litres of LBO was discharged over a wide area.
The existance of the OSCP assisted the client in immediate installation of containment and mitigation measures. Avada then provided on site assistance to verify that residual impaction of soil and groundwater did not pose a risk to receptors.