09 Nov 2006
The 24ha Pilling Lane Siteis located int he south eat of Chorley town ina predominately residential setting and operated by Lex Auto Logistics as a storae and distribution centre of vehicle parts. Operatios at the site will relocate to a purpose built industrial unit in the north of Chorley. Once vacant the site is to be redeveloped for residential use.
BAE Systems Environmental was commissioned to undertake a Phase 1 Land Quality Assessment (LQA) to assess the potential for contamination and to gain sufficient information to plan an intrusive investigation to inform redevelpment for residential purposes.
The Phase 1 LQA showed that the site had operated as a foundry since 1912 when it manufacutred products such as boilers. In WWW1 Leyland Motors acquired the site for motor vehicle manufacture. Since the 1970s / early 1980s it has been used as a storage and distribution centre.
The Phase 1 LQA identified potential pollutant linkages to humans and controlled waters reulting principally from its long hisotrical use and also through current operations.
BAE Systems were commissioned to conduct a Phase 2 assessment which included an intrusive investigation and cosed remediation strategy for implementation by BAE Systems Environmental on behalf of the developer.
The principal objectives of the investigation were to identify and masur the concentration and distribution of known and suspected contaminants; assess the current ground conditions beneath the site including the potential for shallow mine workings to be present; and provide sufficient information to allow an outline remedial strategy to be developed covering both chemical and geotechnical aspects.
To obtain data to meet the objectives of the investigation cable percussive and rotary boreholes, window samples and trial pits were utilised. Soil-gas and groundwater monitoring was also undertaken.
From teh data obtained and the outcome of the risk assessment the strategy developed to best meet th eoverall remedial action obejctives ws: removal and or treatment of elevated PAH and TPH cocentrations identified within particular zones across the Site; and pathway modification via an appropriate membrane and under slab void in new residential units.
Continuous communication was maintained with kety stakeholders at each stge of the project and approval gained befoer further works were conducted.
BAE Systems Environmental has reently been commissioned to carry out the £1.8M site remediation based on the strategy agreed with the Local Authority and the Environment Agency.
