Modification notice
Modification of a contract/concession during its term
Section I: Contracting
entity
I.1) Name and addresses
Carmarthenshire County Council
County Hall
Carmarthen
SA31 1JP
UK
Contact person: Diane Thomas
Telephone: +44 1267234567
E-mail: ddthomas@carmarthenshire.gov.uk
NUTS: UKL14
Internet address(es)
Main address: https://www.carmarthenshire.gov.wales
Address of the buyer profile: https://www.sell2wales.gov.wales/search/Search_AuthProfile.aspx?ID=AA0281
Section II: Object
II.1) Scope of the procurement
II.1.1) Title
Nant-y-Caws Landfill Site Phase 1 Leachate Effluent Treatment Plant Operation
II.1.2) Main CPV code
90730000
II.1.3) Type of contract
Services
II.2) Description
II.2.2) Additional CPV code(s)
90000000
90500000
90710000
90720000
90732000
90733000
90740000
45232430
90700000
65120000
II.2.3) Place of performance
NUTS code:
UKL14
Main site or place of performance:
Nant-y-Caws Landfill Site
Phase 1
Nant-y-Caws
Carmarthen
SA32 8BG
II.2.4) Description of the procurement
Carmarthenshire County Council is responsible for the safe treatment and disposal of leachate arising from a closed landfill site at Nant-y-Caws, Carmarthen, UK.
The leachate is currently treated via a biological treatment plant prior to discharge to a local river under a Natural Resources Wales issued Permit.
The treatment plant consists of a MBBR (Mobile Bed Biological Reactor) and SAF (Submerged Aerated Filter) that successively treats the leachate to enable consented discharge to the river.
The Council invited tenders for the operation and maintenance of the plant with suitably qualified and technically competent personnel.
The site location and address is:
Nant-y-Caws Landfill Site
Phase 1
Nant-y-Caws
Carmarthen
SA32 8BG
Contract Period: 01/02/2022 to 31/01/2025 with an extension option of up to a further 12 months.
II.2.7) Duration of the contract, framework agreement, dynamic purchasing system or concession
Duration in months: 48
II.2.13) Information about European Union funds
The procurement is related to a project and/or programme financed by European Union funds:
No
Section IV: Procedure
IV.2) Administrative information
IV.2.1) Previous publication concerning this procedure
Notice number in the OJ S:
2022/S 000-005321
Section V: Award of contract/concession
Contract No: project_48026
Title: Nant-y-Caws Landfill Site Phase 1 Leachate Effluent Treatment Plant Operation
V.2 Award of contract/concession
V.2.1) Date of conclusion of the contract/concession
31/01/2022
V.2.2) Information about tenders
The contract has been awarded to a group of economic operators:
No
V.2.3) Name and address of the contractor/concessionaire
ExCAL Limited
ExCAL Limited, ExCAL House Capel Hendre Industrial Estate
Ammanford
SA18 3SJ
UK
NUTS: UKL14
The contractor/concessionaire is an SME:
Yes
V.2.4) Information on value of the contract/lot/concession (excluding VAT)
Total value of the contract/lot:
/concession: 198 506.40
GBP
Section VI: Complementary information
VI.3) Additional information
This tender exercise was advertised on Sell2Wales and administered via the eTenderWales e-tendering portal. The project code was: project_48026 and the ITT code: itt_89372
(WA Ref:158892)
VI.4) Procedures for review
VI.4.1) Review body
High Court
Royal Courts of Justice, The Strand
London
WC2A 2LL
UK
Telephone: +44 2079477501
VI.5) Date of dispatch of this notice
17/12/2025
Section VII: Modifications to the contract/concession
VII.1) Description of the procurement after the modifications
VII.1.1) Main CPV code
90730000
VII.1.2) Additional CPV code(s)
90000000
90500000
90710000
90720000
90732000
90733000
90740000
45232430
90700000
65120000
VII.1.3) Place of performance
NUTS code:
UKL14
Main site or place of performance:
Nant-y-Caws Landfill Site
Phase 1
Nant-y-Caws
Carmarthen
SA32 8BG
VII.1.4) Description of the procurement
The duration of the current Contract, which was due to expire on 31/01/2026, has been extended by 10 months to enable the full installation of a new denitrification reed bed to reduce nitrate levels and completion of a reed bed permit variation application to Natural Resources Wales.
VII.1.5) Duration of the contract, framework agreement, dynamic purchasing system or concession
Duration in months: 58
VII.1.6) Information on value of the contract/lot/concession (excluding VAT)
Total value of the procurement: 72 800.00 GBP
The contract/concession has been awarded to a group of economic operators:
No
VII.1.7) Name and address of the contractor/concessionaire
ExCAL Limited
Excal House, Capel Hendre Industrial Estate
Ammanford
SA18 3SJ
UK
NUTS: UKL14
The contractor/concessionaire is an SME:
Yes
VII.2) Information about modifications
VII.2.1) Description of the modifications
The duration of the current Contract, which was due to expire on 31/01/2026, has been extended by 10 months.
The Council, in conjunction with the incumbent plant operator has been required by Natural Resource Wales (NRW) to install a new denitrification reed bed to reduce nitrate levels and ensure the treatment plant does not breach its environmental permit conditions. It is anticipated that all works will be completed by early 2026. However, the process requires on-going input from the incumbent operator (who developed the reed bed) as the reed plants and microbes need a full growing season to mature before they become fully effective at reducing nitrate levels and a reed bed permit variation cannot be sought from NRW until sufficient data has been gathered to support the application. This is likely to be late summer 2026 at the earliest. In addition, additional time will be required to apply and receive approval from NRW.
VII.2.2) Reasons for modification
Need for additional works, services or supplies by the original contractor/concessionaire
Description of the economic or technical reasons and the inconvenience or duplication of cost preventing a change of contractor:
The term of the Contract is being modified in accordance with Regulation 72(1)(b) of the Public Contracts Regulations 2015 (under which the contract was let) as these are additional works which have become necessary and were not included in the initial procurement. A change of operator at this stage cannot be made for economic and technical reasons due to the requirements of interchangeability or interoperability with existing installations procured under the initial procurement. A change of operator would also cause significant inconvenience and substantial duplication of costs for the Council.
VII.2.3) Increase in price
Updated total contract value before the modifications (taking into account possible earlier contract modifications and price adaptions and, in the case of Directive 2014/23/EU, average inflation in the Member State concerned)
Value excluding VAT: 264 643.00 Currency: GBP
Total contract value after the modifications
Value excluding VAT: 337 443.00 Currency: GBP