Buyer Name: Awdurdod Parc Cenedlaethol Eryri
Buyer Address: Penrhyndeudraeth,, Gwynedd, LL48 6LF
Contact Name: Edward Jones
Contact Telephone: +44 1766770274
Reservoir Safety Improvement Works
Buyer Contact Info
Status
Unknown
Unknown
Procedure
limited
limited
Value
n/a
n/a
Published
20 Feb 2026, 12:18
20 Feb 2026, 12:18
Deadline
09 Mar 2026, 12:00
09 Mar 2026, 12:00
Contract Start
n/a
n/a
Contract End
n/a
n/a
Category
works
works
CPV
n/a
n/a
Region
n/a
n/a
Awarded To
n/a
n/a
Official Source
Open Sell2Wales
Open Sell2Wales
Description
Reservoirs Act 1975: Llyn Mair Reservoir, County of Gwynedd, Eryri National ParkReservoir Safety Improvement Works (MIOS)Tender Expression of InterestStillwater Associates has been employed by Eryri National Park to oversee the implementation of reservoir safety improvement works on Llyn Mair Reservoir. The site is located close to the village of Maentwrog, NGR SH 653 412.The proposed works are the construction of a new siphon pipe to allow the reservoir level to be drawn down in case of emergencies. This is to be achieved by repurposing one of the four existing spillways (Spillway âCâ) to contain the new HDPE siphon and then subsequently backfilling with mass concrete or aggregate depending on the location. The upstream leg of the siphon is to be installed using qualified divers with some partial demolition work undertaken to the chamber. Additionally, Spillway âDâ is to be abandoned in situ by forming a wall across the existing channel.The works are required to address statutory recommendations made in the interests of reservoir safety. Eryri National Park has committed to having the works completed by 31st July 2026 and it is imperative that the successful contractor delivers the works accordingly.NOTE: To register your interest in this notice and obtain any additional information please visit the Sell2Wales Web Site at https://www.sell2wales.gov.wales/Search/Search_Switch.aspx?ID=161799.The buyer has indicated that it will accept electronic responses to this notice via the Postbox facility. A user guide is available at https://www.sell2wales.gov.wales/sitehelp/help_guides.aspx.Suppliers are advised to allow adequate time for uploading documents and to dispatch the electronic response well in advance of the closing time to avoid any last minute problems. see tender documents(WA Ref:161799)
Linked Documents
Select a document to preview.
Opportunity Context
Documents
Document Title: 260114 Llyn Mair NEC3_Contract-Draft
Document Title: 260115_LlynMair_HEM&DRA
Document Title: 260217 PCI Appendix B-Buildability-Issue
Document Title: 5202650-ATK-LM-ZZ-DR-C-002_
Document Title: 5202650-ATK-LM-ZZ-RP-C-101 Llyn Mair - Siphon Outline Design 20 07 2023
Document Title: 5224625-ATK-LM-ZZ-DR-C-100_103_P02
Document Title: Llyn Mair Siphon Tender EoI_Issue CYMRAEG
Document Title: Llyn Mair Siphon Tender EoI_Issue
Document Title: P6900-Eryi-llyn Mair-Spec-P6900-001
Raw Notice JSON
Expand raw payload
{
"buyer": {
"id": "org-4",
"name": "Awdurdod Parc Cenedlaethol Eryri"
},
"date": "2026-02-20T12:18:10Z",
"id": "ocds-kuma6s-161799-release-161799",
"initiationType": "tender",
"ocid": "ocds-kuma6s-161799",
"parties": [
{
"address": {
"locality": "Gwynedd",
"postalCode": "LL48 6LF",
"streetAddress": "Penrhyndeudraeth, "
},
"contactPoint": {
"name": "Edward Jones ",
"telephone": "+44 1766770274",
"url": "http://www.eryri.llyw.cymru"
},
"id": "org-4",
"name": "Awdurdod Parc Cenedlaethol Eryri",
"roles": [
"buyer"
]
}
],
"tag": [
"tender"
],
"tender": {
"additionalClassifications": [
{
"description": "Construction work",
"id": "45000000",
"scheme": "CPV"
},
{
"description": "Works for complete or part construction and civil engineering work",
"id": "45200000",
"scheme": "CPV"
},
{
"description": "Construction work for water projects",
"id": "45240000",
"scheme": "CPV"
},
{
"description": "Construction work for dams and similar fixed structures",
"id": "45247200",
"scheme": "CPV"
},
{
"description": "Dam construction work",
"id": "45247210",
"scheme": "CPV"
},
{
"description": "Reservoir construction works",
"id": "45247270",
"scheme": "CPV"
},
{
"description": "Architectural, construction, engineering and inspection services",
"id": "71000000",
"scheme": "CPV"
},
{
"description": "Engineering services",
"id": "71300000",
"scheme": "CPV"
},
{
"description": "Construction-related services",
"id": "71500000",
"scheme": "CPV"
}
],
"awardPeriod": {
"endDate": "2026-04-14T00:00:00Z"
},
"communication": {
"atypicalToolUrl": "https://www.sell2wales.gov.wales"
},
"description": "Reservoirs Act 1975: Llyn Mair Reservoir, County of Gwynedd, Eryri National ParkReservoir Safety Improvement Works (MIOS)Tender Expression of InterestStillwater Associates has been employed by Eryri National Park to oversee the implementation of reservoir safety improvement works on Llyn Mair Reservoir. The site is located close to the village of Maentwrog, NGR SH 653 412.The proposed works are the construction of a new siphon pipe to allow the reservoir level to be drawn down in case of emergencies. This is to be achieved by repurposing one of the four existing spillways (Spillway \u00e2\u0080\u0098C\u00e2\u0080\u0099) to contain the new HDPE siphon and then subsequently backfilling with mass concrete or aggregate depending on the location. The upstream leg of the siphon is to be installed using qualified divers with some partial demolition work undertaken to the chamber. Additionally, Spillway \u00e2\u0080\u0098D\u00e2\u0080\u0099 is to be abandoned in situ by forming a wall across the existing channel.The works are required to address statutory recommendations made in the interests of reservoir safety. Eryri National Park has committed to having the works completed by 31st July 2026 and it is imperative that the successful contractor delivers the works accordingly.NOTE: To register your interest in this notice and obtain any additional information please visit the Sell2Wales Web Site at https://www.sell2wales.gov.wales/Search/Search_Switch.aspx?ID=161799.The buyer has indicated that it will accept electronic responses to this notice via the Postbox facility. A user guide is available at https://www.sell2wales.gov.wales/sitehelp/help_guides.aspx.Suppliers are advised to allow adequate time for uploading documents and to dispatch the electronic response well in advance of the closing time to avoid any last minute problems.\n\nsee tender documents(WA Ref:161799)",
"documents": [
{
"dateModified": "2026-02-20T12:18:11Z",
"datePublished": "2026-02-20T12:18:11Z",
"format": "application/pdf",
"id": "ocds-kuma6s-161799-document-161799-FEB590493-1",
"title": "260114 Llyn Mair NEC3_Contract-Draft",
"url": "https://www.sell2wales.gov.wales/Notice/Download/DocumentDownload.aspx?id=FEB590493\u0026idx=1"
},
{
"dateModified": "2026-02-20T12:18:12Z",
"datePublished": "2026-02-20T12:18:12Z",
"format": "application/pdf",
"id": "ocds-kuma6s-161799-document-161799-FEB590493-2",
"title": "260115_LlynMair_HEM\u0026DRA",
"url": "https://www.sell2wales.gov.wales/Notice/Download/DocumentDownload.aspx?id=FEB590493\u0026idx=2"
},
{
"dateModified": "2026-02-20T12:18:13Z",
"datePublished": "2026-02-20T12:18:13Z",
"format": "application/pdf",
"id": "ocds-kuma6s-161799-document-161799-FEB590493-3",
"title": "260217 PCI Appendix B-Buildability-Issue",
"url": "https://www.sell2wales.gov.wales/Notice/Download/DocumentDownload.aspx?id=FEB590493\u0026idx=3"
},
{
"dateModified": "2026-02-20T12:18:14Z",
"datePublished": "2026-02-20T12:18:14Z",
"format": "application/pdf",
"id": "ocds-kuma6s-161799-document-161799-FEB590493-4",
"title": "260217 PCI Appendix B-Buildability-Issue",
"url": "https://www.sell2wales.gov.wales/Notice/Download/DocumentDownload.aspx?id=FEB590493\u0026idx=4"
},
{
"dateModified": "2026-02-20T12:18:15Z",
"datePublished": "2026-02-20T12:18:15Z",
"format": "application/pdf",
"id": "ocds-kuma6s-161799-document-161799-FEB590493-5",
"title": "5202650-ATK-LM-ZZ-DR-C-002_",
"url": "https://www.sell2wales.gov.wales/Notice/Download/DocumentDownload.aspx?id=FEB590493\u0026idx=5"
},
{
"dateModified": "2026-02-20T12:18:15Z",
"datePublished": "2026-02-20T12:18:15Z",
"format": "application/pdf",
"id": "ocds-kuma6s-161799-document-161799-FEB590493-6",
"title": "5202650-ATK-LM-ZZ-DR-C-002_",
"url": "https://www.sell2wales.gov.wales/Notice/Download/DocumentDownload.aspx?id=FEB590493\u0026idx=6"
},
{
"dateModified": "2026-02-20T12:18:15Z",
"datePublished": "2026-02-20T12:18:15Z",
"format": "application/pdf",
"id": "ocds-kuma6s-161799-document-161799-FEB590493-7",
"title": "5202650-ATK-LM-ZZ-RP-C-101 Llyn Mair - Siphon Outline Design 20 07 2023",
"url": "https://www.sell2wales.gov.wales/Notice/Download/DocumentDownload.aspx?id=FEB590493\u0026idx=7"
},
{
"dateModified": "2026-02-20T12:18:16Z",
"datePublished": "2026-02-20T12:18:16Z",
"format": "application/pdf",
"id": "ocds-kuma6s-161799-document-161799-FEB590493-8",
"title": "5224625-ATK-LM-ZZ-DR-C-100_103_P02",
"url": "https://www.sell2wales.gov.wales/Notice/Download/DocumentDownload.aspx?id=FEB590493\u0026idx=8"
},
{
"dateModified": "2026-02-20T12:18:16Z",
"datePublished": "2026-02-20T12:18:16Z",
"format": "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
"id": "ocds-kuma6s-161799-document-161799-FEB590493-9",
"title": "Llyn Mair Siphon Tender EoI_Issue CYMRAEG",
"url": "https://www.sell2wales.gov.wales/Notice/Download/DocumentDownload.aspx?id=FEB590493\u0026idx=9"
},
{
"dateModified": "2026-02-20T12:18:16Z",
"datePublished": "2026-02-20T12:18:16Z",
"format": "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
"id": "ocds-kuma6s-161799-document-161799-FEB590493-10",
"title": "Llyn Mair Siphon Tender EoI_Issue",
"url": "https://www.sell2wales.gov.wales/Notice/Download/DocumentDownload.aspx?id=FEB590493\u0026idx=10"
},
{
"dateModified": "2026-02-20T12:18:16Z",
"datePublished": "2026-02-20T12:18:16Z",
"format": "application/pdf",
"id": "ocds-kuma6s-161799-document-161799-FEB590493-11",
"title": "P6900-Eryi-llyn Mair-Spec-P6900-001",
"url": "https://www.sell2wales.gov.wales/Notice/Download/DocumentDownload.aspx?id=FEB590493\u0026idx=11"
}
],
"eligibilityCriteria": "see tender documents ",
"id": "ocds-kuma6s-161799-tender-161799",
"mainProcurementCategory": "works",
"procurementMethod": "limited",
"submissionMethodDetails": "https://www.sell2wales.gov.wales",
"tenderPeriod": {
"endDate": "2026-03-09T12:00:00Z"
},
"title": "Reservoir Safety Improvement Works "
}
}