Case Studies

We are pleased to share some of the details of successful applications of remediation solutions, particularly where the project is complex or otherwise noteworthy, or where the techniques applied are innovative. New Case Studies will appear on the site from time to time. If you would like to receive these by e-mail as soon as published, or to obtain the full version of a case study report, please send an e-mail, stating your requirements and giving full address details to:

info@qdsltd.com

Case Study No. 1

Excavation, segregation and pre-treatment works at town gasworks – North Wales

·       Former gasworks in sensitive town centre location with adjacent commercial and residential properties

·       Redevelopment for commercial use as multi- storey car park, with basement

·       Space constrained excavation area (0.4 ha) requiring detailed site management plans

·       Works complicated by culverted watercourse, residual tar filled tanks, below ground gas holders and mains sewer.

·       Presence of coal tar free product, grossly impacted soils and groundwater

·       Dewatering and treatment of contaminated groundwater

·       Landfill Tax exemption gained

·       Remediation to risk assessment derived and regulator approved targets

 

Remediation Method:

Excavation, segregation, pre treatment and selected off site disposal

·       Approx 9000 tonnes excavated to max 5m, segregated and pretreated, with 3,200 tonnes removed to landfill

·       Detailed delineation works ahead of the main works

·       Excavations carried out in vicinity of retained structures.

·       Grossly impacted soils segregated and pre-treated in constructed, membrane lined, treatment cells

·       Dewatering of excavations through water treatment plant

·       Stabilisation of liquid and solid wastes prior to offsite disposal undertaken using imported additives

Results:

·       Works, undertaken on a lump sum basis, completed on schedule

·       Remediation Targets and Regulator signoff achieved

New Case Studies will appear on the site from time to time. If you would like to receive these by e-mail as soon as published, then please subscribe by sending an email to:

info@qdsltd.com