Rhodo Tender
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Tender for Ditch Blocking and Re-profiling at Foel Boeth, Parc, Y Bala, Gwynedd (SH832 340) REF - 3/NC/056/FoelBoeth Contents: A. Specification of works A1. Background to project A2 Location of work site A3. Purpose of work A4. Description of work A5 Methodology and method statement A6. Contract period A7. Access arrangements A8. Site specific hazards B. General contract conditions B1. Tendering and contract management B2. Site management B3. Site safety: safety of third parties B4. Site safety: safety of workforce B5. Site safety: environmental safeguards C. Site maps and photographs Appendix 1 – NRW ‘Welfare Standard For Those Working On NRW Managed Land ’ Appendix 2 – Forestry Commission ‘Managing Forest Operations To Protect The Water Environment’ Appendix 3 – NRW ‘First Aid Standard for those working on the Welsh Government Woodland Estate’ Appendix 4 – Foel Boeth Map of Ditches to be Blocked (attached) Appendix 5 – Foel Boeth 2009 Aerial Photograph (attached) A Specification of works A1: Background to project This procurement project is an opportunity for Contractors to tender for the works described below. The work is subject to the neighbour at Trawscoed Farm providing formal access permission to the work site, SSSI assent being approved by Natural Resources Wales (NRW) in a timely manner, and the necessary associated pre-commencement documentation being provided by the successful Contractor. Following scoring of the tenders, the successful and most acceptable tender will then become a contract between the successful Contractor and the Snowdonia National Park Authority. Contact [email protected] for electronic copies of Appendices 1, 2 & 3. This contract is to block and re-profile 25.728km of ditches within an area of ~15ha of open mountain land (a former checked conifer plantation that was felled to waste in ~2008-2009) that is managed by NRW at Foel Boeth, Parc, Y Bala, Gwynedd (Ordnance Survey grid reference SH832 340). See 1 Figure 1 in Section C for the Location Map and permissive access route, and Figure 2 (& Appendix 4) for a map of the works required. All boundaries are well fenced. A stock-proof fence is the boundary between Trawscoed Farm and NRW Foel Boeth (part of the ‘Lordship’ Forest Block). A small part of this fence will need to be temporarily taken down to allow excavator access to Foel Boeth from Trawscoed. The fence will need to be restored to its original stock-proof condition as soon as the work is completed. The point of entry to Foel Boeth from Trawscoed should remain stock-proof during the time period in between excavators entering and exiting the site upon completion. The peatland is to be restored and is not proposed for re-stocking with trees. The peatland was originally intensively ditched and planted with conifers at some point during the 1980’s. Many of the felled trees were significantly checked due to the wet ground conditions. The trees were felled to waste and snedded, and the cut material squeezed into the ditches in ~2008-2009. Regenerating volunteer sitka spruce and lodgepole pine trees were given the same treatment in winter 2019-2020 and the work site is now clear of trees (other than a few occasional broadleaves such as willow in wetter parts). A good number of the drains and furrows on the site (perhaps less than half?) were blocked with peat dams installed every 10 metres or so with excavators in ~2009 (see Figure 3 & Appendix 5). It appears that no cross drains were blocked. Due to access, breeding bird and funding constraints, the ditch blocking and re-profiling work must be completed by 31st March 2021, and invoiced by the 31st March 2021. All Contractors wishing to tender for this work should only do so if they are confident that they have the capacity to undertake the work within this timetable. The site is within the Migneint-Arenig-Dduallt Site of Special Scientific Interest (SSSI), the Migneint-Arenig- Dduallt Special Protection Area (SPA) and the Migneint-Arenig-Dduallt Special Area of Conservation (SAC). Restoration of the peatland at Foel Boeth will move the Migneint-Arenig-Dduallt designated sites closer towards Favourable Conservation Status, and move Wales closer to Ministerial and Welsh Government targets to restore degraded deep peatland sites. Access permission to work on the land at Foel Boeth has been discussed with relevant NRW staff. Formal access permission to work on the Foel Boeth work site (part of the Welsh Government woodland estate) has been issued by NRW on 6th January 2021. SSSI ‘assent’ is expected to be issued by NRW by the end of January 2021. This contract is subject to the neighbouring landowner at Trawscoed Farm providing formal access permission to Foel Boeth (permission has been given verbally in principle). This contract is also subject to all the necessary associated pre-commencement documentation (e.g. Welfare Assessment, Risk Assessment, Emergency Plan, Method Statement, and certificates of competence) being provided by the Contractor in a timely manner. A2: Location of work site The Site is approximately 4.5km west of the village of Parc, near Y Bala, Gwynedd. The Site is at Ordnance Survey grid reference SH832 340, at an altitude of approximately 500 metres. Access by excavators from NRW forest roads is currently not physically possible as there are no internal forest roads or rides to the Foel Boeth work site, and the ground to access the site internally from within the NRW managed estate is too rough, boulder strewn and afforested. There is one obvious and feasible access route for excavators to the site, which involves crossing a neighbour’s land from Trawscoed Farm. See Section A7 below for access arrangements, and Figure 1 in Section C for the Location Map that also shows the identified outline permissive access route (subject to a separate agreement/consent that SNPA are currently formalising with the landowner). The area for ditch blocking and ditch re-profiling lies on the most north-westerly part of the Foel Boeth forest block – see Figure 2 in Section C & Appendix 4. This is an area of predominantly deep peatland (≥0.5 metres), most of which is on gently-moderately sloping land. A3. Purpose of work The purpose of the work is to complete the blocking (and undertake re-profiling) of the ditches on the site in order to enable full hydrological restoration of the peatland. This will further promote re- generation of the nutrient-poor open ground vegetation and wet habitats (blanket bog and wet heath) that prevailed on the site before it was largely drained and planted with conifers in the 1980’s. 2 Hydrological restoration of previously-drained and degraded peatlands is a crucial intervention in order to restore peatland conditions to those in which peat can accumulate once more. Ditch blocking and re-profiling, when done sensitively, could also remove obstacles to subsequent management. Examples are the facilitation of grazing in the longer term - reducing the frequency and facilitation of the ability to control potential invasive non-native species (e.g. sitka spruce, lodgepole pine and Rhododendron ponticum) infestations in the future. Light summer grazing would also result in the inhibition of the establishment of native broadleaves (e.g. birch) which can dry peatlands. Some of the deep pools behind some of the drains that were blocked or partially blocked in 2009 make future grazing management of the site by stock hazardous and therefore highly unlikely. See Figure 3 (& Appendix 5) for a rough idea of the areas where ditches were blocked every ~10 metres with peat dams (dark pools of water are visible behind many of the dams) on parts of the site in ~2009. The work is consistent with the objectives of the Countryside Council for Wales’ (qua Natural Resources Wales, formed on 1st April 2013) Core Management Plan for Migneint-Arenig-Dduallt SAC. A4. Description of work The total Foel Boeth work site area ear-marked for ditch blocking and re-profiling as part of peatland restoration is approximately 15ha in size (a total ditch length of 25.728km). Table 1 below shows the area size of the Restoration Zone. Table 1 Restoration Zone Area (ha) Ditch blocking and re-profiling 15 ha TOTAL 15 ha See Photographs 1-5 in Section C for a better idea of the current appearance of the site and the approach to the site from Trawscoed. A5. Methodology and method statement General 5.1 Operations will be carried out during February 2021 – March 2021. 5.2 Protection of the environment is paramount. Any small areas around the lower edges of the site that are too wet and boggy to access with tracked excavators should be left well alone. 5.3 Working methods will follow current best practice as summarised in the Guidance for Pollution Prevention (GPP) series found at https://www.netregs.org.uk/environmental-topics/pollution- prevention-guidelines-ppgs-and-replacement-series/guidance-for-pollution-prevention-gpps-full-list/ and the UK Forestry Standard Guidelines, Forestry Commission (2017). Note in particular the need to protect peat and watercourses. Measures should be taken to reduce the risk of downstream pollution by discoloured peaty water, sediment, oils etc. Suitably installed straw bale dams and geotextile filters immediately below works may be appropriate. Oil spill kits must be available throughout the duration of the works and the appropriate biodegradable hydraulic oils/lubricants used. Refuelling and fuel storage should not take place within the SSSI other than on the stone track/borrow pit/turning area (at SH83438 33133). Fuels and oils stored on the stone track and borrow pit/turning area will be in locked bunds. Advice can be provided by the SNPA Supervisory Officer.