Flanders Moss NNR - Statement of requirement - Peatland restoration - Bund creation

Description

The aim of this contract is to build 3 bunds along the north/west edge of the designated site. Estimated length 930 meters x 2 – Back-to-back due to water pressure. 425 meters x 1 Excavate the trench to the depth of any cracks, peat pipes or oxidised peat, removing the turf and any oxidised peat and putting to one side. Fill the trench with unoxidized peat, taken from an adjacent borrow pit. The turf of the borrow pit should be removed and put to one side along with any oxidised peat. Use the unoxidized peat from the borrow pit to fill in the trench and compact to create a peat dam within the peat body. Form a low surface bund of no more than 25cm to intercept surface flow and cap with the retained turf. Back fill the borrow pit with degraded peat, reprofile to shallow the angle and stretch the turf to minimise any bare peat. As the peat on the edge of the site is likely to be well oxidised it won’t make very suitable bunding material so where possible the underlying clay should be used. Lot 1: The aim of this contract is to build 3 bunds along the north/west edge of the designated site. Estimated length 930 meters x 2 – Back-to-back due to water pressure. 425 meters x 1 Excavate the trench to the depth of any cracks, peat pipes or oxidised peat, removing the turf and any oxidised peat and putting to one side. Fill the trench with unoxidized peat, taken from an adjacent borrow pit. The turf of the borrow pit should be removed and put to one side along with any oxidised peat. Use the unoxidized peat from the borrow pit to fill in the trench and compact to create a peat dam within the peat body. Form a low surface bund of no more than 25cm to intercept surface flow and cap with the retained turf. Back fill the borrow pit with degraded peat, reprofile to shallow the angle and stretch the turf to minimise any bare peat. As the peat on the edge of the site is likely to be well oxidised it won’t make very suitable bunding material so where possible the underlying clay should be used.