The Avenue Reed Bed

Tender description

PLEASE NOTE: Version 5 the latest Q & A document has been uploaded to the HCA extranet. PLEASE NOTE: Version 4 the latest Q & A document has been uploaded to the HCA extranet. The site lies within the boundary of the former Avenue Coking Works, which has historically been used as a colliery, lime and ironworks and most recently a coke and chemical works. The coking works closed in 1992 and the land - including the Site - has been subject to a voluntary remediation scheme, commissioned by the Homes and Communities Agency. Remediation of the wider Avenue land parcel commenced in 2009 and is now largely complete. However, a sub-surface perched groundwater unit remains in the vicinity of the River Rother at the north east corner of the site. The objectives of the Project are as follows: 1. Construction of environmental management reed bed incorporating: • Excavation to formation for new reed bed structure with 1:3.5 batters • Partially lined reed bed trench with gabion walls • Soil infilled reed bed • Ground water cut off inlet structure incorporating stone/gravel medium, rainwater collection, • baffles, solids collection pipe, odour collection pipe • Reed bed outlet incorporating stone/gravel medium and outlet pipe • High level gravel reed bed • High level reed bed discharge chamber with flow control • Piped discharge to river • Sheet pile groundwater flow cut off walls • Access steps etc. 2. Landscaping to reed bed batter and areas affected by the works (Zone 2 fill area and stockpile area) 3. Treatment of groundwater flow during construction and establishment of reed bed 4. Safety fencing around reed bed 5. Reinstatement of Multi User Route