Operation of a water-purification plant

Tender description

The Coal Authority seeks to let an operation and maintenance contract for the Wheal Jane mine water treatment scheme near Truro, Cornwall. The existing operating contract ends in October 2020. The Wheal Jane mine water treatment scheme treats mine water pumped from below ground using a high density sludge process. The resultant sludge is pumped to a dam and the treated water is discharged to a stream. In a typical year approximately 6 million cubic metres of mine water is abstracted, 600 tonnes of metal contaminants (predominantly iron and zinc) are removed and 2 000 tonnes of hydrated lime, 7 000 kg of anionic flocculant and 3 000 MW-h of power are consumed. In addition to the operating plant, the plant infrastructure includes a workshop, storage facilities and office space. The plant is fully manned 8 a.m.-4 p.m. Monday-Friday, with an out-of-hours emergency on-call roster in operation. During peak periods, skeleton weekend coverage is sometimes necessary. The Coal Authority seeks to let a 10-year operation and maintenance contract for the Wheal Jane mine water treatment scheme near Truro, Cornwall. The existing operating contract ends in October 2020. The Wheal Jane mine water treatment scheme treats mine water pumped from below ground using a high density sludge process. The resultant sludge is pumped to a dam and the treated water is discharged to a stream. In a typical year approximately 6 million cubic metres of mine water is abstracted, 600 tonnes of metal contaminants (predominantly iron and zinc) are removed and 2 000 tonnes of hydrated lime, 7 000 kg of anionic flocculant and 3 000 MW-h of power are consumed. In addition to the operating plant, the plant infrastructure includes a workshop, storage facilities and office space. The plant is fully manned 8 a.m.-4 p.m. Monday-Friday, with an out-of-hours emergency on-call roster in operation. During peak periods, skeleton weekend coverage is sometimes necessary. The service required under the contract is the operation of and planned and preventative maintenance to the mine water treatment plant including: • carrying out daily checks on the plant, taking samples and carrying out maintenance activities; • making informed adjustments to the treatment process to ensure efficient use of chemicals and power; • procuring chemicals and supervising delivery; • developing and implementing a 10-year asset management programme and maintaining an asset management system; • ensuring compliance with consents, licences and permits and liaising with appropriate regulatory bodies; • adhering to health, safety and environmental standards; • reporting operational costs, safety statistics and performance trends; • provision and management of a database to capture and store plant data. Additional services may be instructed and may include: • project management of capital projects; • managing, supervising and assisting in research and development projects; • providing flow monitoring and water sampling services in the south west region; • emergency works. The operating contract will be let under the NEC term service contract. Escorted site visit All interested parties are invited to undertake an escorted visit of the site on 26 November 2019 Those wishing to participate are required to confirm the names and mobile contact numbers of attendees (maximum of three) by way of the messaging function on the procurement portal. Upon receipt of these details more information regarding the visit will be provided Additional technical information There is additional technical information that will support your understanding of the requirements of the site which could not be provided within the procurement portal owing to the size of files. We will provide this information by way of an encrypted memory stick to any interested parties who provide a postal address to which it can be sent, by way of the messaging function on the procurement portal. This information is provided on condition of its return to the Coal Authority once the procurement process has been completed.