"Further to letters dispatched by the developer in April and May, and having consulted colleagues, I would like to offer the following comments on behalf of the Welsh Government.
From an economic development perspective, we are supportive of the power plant proposal. The Power Generation Plant proposal with a peaking plant fired on natural
gas could provide an important socio economic contribution in an area of higher than average unemployment. The plant as a peaking plant provides an important additional facility to add to energy security.
Having reviewed the ES documentation and appendices Transport Department colleagues can confirm that the proposed development will be accessed directly off the RCT County Road and that the likely traffic generation on the approaching Trunk Road (A465) will be low throughout the construction period of 22 months, only reaching a peak in late 2018 with approximately 91 employee movements if all are single occupancy vehicle movements However, we would draw the applicant’s attention to the proposed completion of the remaining two Sections of the A465 (Sections 5 and 6) which are due to be complete by 2020 and therefore these would be likely to be on site during the construction period of this Gas Fired Power Station. Therefore, there will be a need for the applicant to continue to liaise with the Welsh Government as Highway Authority for the Trunk Roads in Wales to ensure there is a deliverable programme of works for the two schemes.
The applicant will also need to prepare a comprehensive Construction Traffic Management Plan to ensure that any AIL movements can be accommodated through any highway construction works that may be in place at the time of their proposed movement.
The following information (appendix A) should be incorporated within the DCO in order to protect the free flow and safety of traffic on the trunk road.
Wording for the condition or requirement for a
Construction Traffic Management Plan
No development other than felling shall commence until a Construction Traffic Management Plan (TMP) has been submitted to and approved by both the Local Planning Authority and Welsh Government Transport, the Highway Authority for the Trunk Road Network (TRN) in Wales. The TMP shall detail the proposals for the movement of construction traffic and Abnormal Indivisible Loads (AIL) associated with wind farm development and shall include the following:
(a) Construction vehicle routeing plans at 1:2,500 scale for all traffic including AIL showing swept path analysis from the point of entry onto the highway network to the site; and in reverse for decommissioning.
(b) Construction vehicle routeing plans at 1: 2,500 scale for all traffic including AIL showing highway mitigation required and land ownership boundaries including identified holding areas, passing areas and layover areas. Any highway mitigation shall include supporting HD19/03 Safety Audit documentation.
(c) No development shall commence until the land required for highway mitigation and holding areas has been acquired or made available for use.
(d) Site access highway design plans at 1: 2,500 scale that shall include supporting HD19/03 Safety Audit documentation.
(e) Detailed schedules of the management of junctions to and crossings of the public highway and other public rights of way during delivery of AIL, construction materials and other operating equipment.
(f) The provision of delivery schedules detailing the time and date of movements, nature of delivery vehicles: particularly details of AIL detailing vehicle parameters, gross vehicle weight, number of vehicles in convoy size, dimensions (width, length, height) and weight (total vehicle with load and axel loading).
(g) Details of AIL escorts highlighting where and when along the route private vehicles, banksman and Police vehicles escorts will be used.
(h) Provision of plan drawings and associated traffic signs schedule highlighting locations along the route where temporary traffic management (cones, temporary signs, etc.) needs to be deployed.
(i) An agreed impact assessment of AIL on all highway structures on the affected route, including bridges, culverts, retaining walls, embankments, drainage features, and third party buildings and structures shall be included in the TMP.
(j) The making good of any incidental damage done by construction traffic associated with the proposed development to the trunk road and county road network including street furniture, structures, drainage features, highway verges and carriageway surfaces.
(k) Documented trial runs with supporting videoed evidence shall be included in the TMP demonstrating the suitability of the entire transport route from point of entry onto the highway network to the site for all AIL and in reverse for the decommissioning of the windfarm.
(l) The development shall be carried out in accordance with the approved TMP.
The applicant should consult with the Trunk Road Agent so that constraints on vehicle movements such as, embargo periods, route traffic sensitivity, temporary roadworks and other highway restrictions are included in the TMP.
If deemed necessary by the Police or relevant Highway Authority, Temporary Traffic Regulation Orders (TTRO) shall be required to facilitate the movement of AIL. The Highway Authority for County Roads is the local Authority and for the TRN the Welsh Government is the Highway Authority. TTRO approval of applications on TRN take up to 12 weeks.
A Road Space Booking application shall be completed in advance of any TRN movements, are available from the relevant Trunk Road Agent and shall be completed by the applicant.
• Swept path analysis – the calculation and analysis of the movement and path of different parts of a vehicle when that vehicle is undertaking a turning manoeuvre. At a basic level this includes calculating the path taken by each wheel during the turn and also calculating the space needed by the vehicle body during the turn.
• HD 19/03 Road Safety Audit – Highways Directive for the mandatory requirement for Road Safety Audits on all trunk roads. It is contained within the Design Manual for Roads and Bridges Volume 5 Section 2 Part 2.