Case Study One
Project type: Escape of kerosene within a Source Protection Zone (SPZ1)
Project reserve: £100,000
Project duration: 3 years
In this incident around 1775 litres of kerosene were estimated to have been lost to ground with an Environment Agency Source Protection Zone (SPZ1). A public water extraction point located only 270m away from the spill origin, down gradient, was at risk.
The remediation pursued two aspects. Firstly, the remediation of buildings which consisted of contaminated garage walls, foundations, floors and sub-floors; and secondly the risks of impacting controlled waters in the form of a water table at 10-20m below ground level and a public water extraction point within 270m.
Deep excavations were required to remove superficial contamination to over 2m below ground level and in-situ bioremediation techniques were also employed. A monitoring programme was implemented for 3 years after the incident date utilising deep groundwater monitoring bore holes.
Case Study Two
Project type: Fuel line leak in an environmentally sensitive hill top location
Project reserve: £210,000
Project duration: 18 months
In this incident, around 1,000 litres of kerosene were estimated to have escaped to ground next to the property with walls, foundations, floors and sub-floors impacted. The nature of the ground facilitated deep penetration of fuel to a water table at around 6m below ground level, putting at risk local private water extraction points and a nearby stream.
Groundwater remediation took place with an extended monitoring period of 18 months from the incident, utilising deep bore holes for groundwater monitoring purposes and for contaminated water extraction.
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