Carnell worked in collaboration with BEAR Scotland, the trunk road operating company for Transport Scotland’s North East unit, to undertake filter drain refurbishment at two locations on the A96 in July 2022.
Using the StoneMaster process to recycle the filter drain media in-situ, provided several carbon, safety and customer benefits over the traditional dig-out and replace method.
The combined 3,750m length of filter drain was brought back to specification in 11 night shifts, 5 fewer than planned. By only taking away non-compliant material, 787 HGV journeys were removed from the network, while the reduction of materials and haulage alone led to a reduction in CO2e emissions of over 54 tonnes.
Using StoneMaster on the A96 to recycle the filter drain in-situ resulted in:
- 3,750m of safer road.
- Re-use of 2201m3 aggregate.
- 11,412 fewer HGV miles transporting materials.
- Completion 5 shifts ahead of programme.
- Reduction of 30,266m3 CO2e. The equivalent volume of of 11 hot air balloons!