The Coal Authority is inviting suppliers to register their details ahead of tendering a contract for a Mine Water Pumping Borehole scheme with an estimated total value of £500,000.
The Authority has issued a Prior Information Notice setting out its requirement for a mine water pumping borehole to assess rising mine water on the surrounding environment at Westleigh, Wigan.
A review of the mine water block has highlighted that mine water levels in the area could be elevated in respect to the rest of the block. There is potential for elevated mine water levels which could pose a risk to the overlying drinking water aquifers and the surface water environment.
The scheme will involve the construction of a borehole to intersect flooded underground workings and will be used to improve understanding of mine water in the Golborne- Bickershaw-Parsonage mine water sub-block of the Lancashire Coalfield, through water level monitoring, quality sampling and long-term abstraction.
Key requirements are as follows:
Operational time: By March 2025.
Methodology: Anticipated to require a pilot hole to be drilled by wireline coring methods to assist in maintaining verticality.
Borehole depth: Estimated 200 - 250 metres below ground level (m bgl).
Final internal diameter: Minimum of 400mm.
Borehole deviation: 2m from surface location of borehole (0.6° from vertical).
Design life: Minimum of 20 years.
Headworks: To be completed under a square split lockable manhole cover at surface, minimum of 600mm x 600mm with D400 rating.
Interested suppliers will need to register their company details with the Coal Authority by logging on to https://inbye.coal.gov.uk/s2c/. Estimated date of publication of the formal contract notice is 1 July 2024.
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