Penhesgyn HWRC – Summary of Proposed Redevelopment 1 ...democratiaeth.ynysmon.gov.uk/Data/Bwrdd y... · decommissioning of the existing weighbridge would not be appropriate at this

Technical Note 1

Penhesgyn HWRC – Summary of Proposed Redevelopment

1. Background

Isle of Anglesey County Council (IACC) owns and operates the household waste recycling centre (HWRC) at the Penhesgyn site near Llansadwrn, Anglesey. The extent of the HWRC site is shown on Drawing 29387_N_P_CVT_SK01 included in Appendix A. It comprises a level area where cars and vans can access a number of small recycling containers and eight large (36 m3) skips at a lower level which are accessed from gantries. The skips are serviced from the lower level.

Access to the HWRC is currently shared with HGVs (Heavy Goods Vehicles) using the waste transfer station (WTS) located to the east of the HWRC. Cars and vans using the HWRC have to undertake a three point turn to exit the area and there are conflicts with the WTS HGV traffic.

2. Issues with the Existing Site

2.1 Health & Safety The current site operations involve the members of the public who are visiting the HWRC having to share the access road with vehicles, including HGV vehicles, accessing the WTS. The issue is compounded by the need for the public to have to turn within the current HWRC area which involves them reversing across the WTS vehicle route. The present HWRC operation presents a significant health and safety risk as a result of the traffic conflicts.

In order to minimise the risk to users of the site it would be necessary to segregate the public traffic from the remainder of the site traffic.

2.2 Traffic Management As well as minimising Health and Safety issues at the site there is also a need to improve traffic management which can be achieved in two ways:

• Segregation of WTS traffic from users of the HWRC; and

• Providing a circular route in and out of the HWRC to avoid traffic reversing across the access road.

© AMEC Environment & Infrastructure UK Limited 16 September 2011 H:\Projects\29387 Recycling Centre Upgrades\Docs\N035 and N036\n035i1.doc

Technical Note 2

The segregation of WTS and HGV traffic was planned by IACC as a separate scheme with WS Atkins as designers. Originally this scheme was to take WTS traffic on a separate route around the eastern side of the WTS and as part of this scheme the existing weighbridge at the northern end of the HWRC site was to be decommissioned and a new weighbridge installed adjacent to the WTS. However due to uncertainties surrounding the WTS site and its potential inclusion in the long term North Wales Residual Waste contract it was decided that decommissioning of the existing weighbridge would not be appropriate at this time and as a result AMEC was asked to revisit the HWRC options taking this into consideration.

In addition to the public visitor traffic management issues there are also issues around the operational traffic within the HWRC. At present the site has to be temporarily closed when recycling containers within the HWRC on the upper level are full and require removal. A review was required to consider how waste containers could be relocated in order to allow access for emptying without the need for temporarily closing the site.

2.3 Recycling Capability The current site has a constrained footprint which does not allow for any expansion of the site. If IACC is to meet its current recycling targets it will be necessary to expand the range of recycling facilities available at the site. Expansion of the HWRC site footprint would allow for additional recycling capacity with the provision of additional skips and additional recycling banks and containers.

An additional option for increasing recycling is by segregating recyclables from mixed municipal waste that is delivered to the site. At present there is no space available to introduce such an operation due to the current site constraints. Redevelopment of the site would allow the introduction of a limited sorting facility which would assist in increasing the recycling capacity at the site.

2.4 Site Staffing and Welfare Some of the existing welfare and office facilities by the weighbridge are past their serviceable life and require replacement. Redevelopment of the site would allow replacement with new containerised units. A new prefabricated building would be required at the entrance to the HWRC to accommodate HWRC operational staff. Otherwise staff would continue to use the existing welfare and canteen facilities by the weighbridge.

2.5 Other Issues At the southern end of the existing HWRC site the pre-cast retaining walls supporting the recycling containers are in poor condition and will need to be replaced if the existing site is to continue in operation.


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3. Options Appraisal

IACC commissioned AMEC Environment & Infrastructure UK Ltd (AMEC) to undertake an appraisal of alternative options for the site that would address the issues identified in Section 2.

IACC had prepared separate proposals to decommission the weighbridge at the northern end of the HWRC and to establish a new weighbridge elsewhere for the WTS. The WTS was also to have a new traffic routing so its associated HGVs would no longer have to pass the HWRC site. The proposed decommissioning of the weighbridge and relocation or removal of the adjacent current site office and welfare buildings gave the potential for the HWRC to be expanded further to the north.

AMEC undertook the optioneering process with IACC to look at provisional layouts for expanding and improving the HWRC site on the basis that the weighbridge and adjacent buildings will be removed/ relocated. AMEC undertook an initial consultation with IACC waste management officers and site staff and initially prepared three layout options for consultation. Following comment and review these were refined down to two options and following further dialogue a preferred option for expanding the existing site into the area currently occupied by the current site offices and weighbridge was agreed.

Subsequently IACC decided not to relocate the weighbridge due to uncertainties around the future use of the WTS as part of the long term North Wales Residual Waste contract. AMEC was asked to reconsider the proposed HWRC solution and a revised preferred option was developed around the current weighbridge being left in place. This preferred option was based on siting the HWRC further to the south in an area between the existing HWRC site and landfill gas generation compound.

4. Preferred Option

The decision to leave the weighbridge in place meant it was not possible to redevelop the existing HWRC while addressing the health and safety and traffic management issues at the site. A review of options available resulted in the preferred option being the relocation of the HWRC to the south of the existing HWRC. The proposed location and layout of the new HWRC facility is shown on Drawing 29387_Penhesgyn GA included in Appendix A. A cross section of the proposed development is also included.

All the site traffic, public and HGV, will share the initial length of the site access road which is currently a one way system. At the end of the one way system the traffic will enter a yellow hatched “No Stopping Zone”, off which there will be separate access roads for the HWRC, the WTS and the IVC (In Vessel Composting) facility.

The relocation of the HWRC removes the vehicle conflict issue as the HGV traffic will use the existing access road from the proposed “No Stopping Zone” to the weighbridge and the HWRC site traffic will have a separate dedicated access route from the yellow “No Stopping Zone”.

The HWRC traffic will be provided with a circular route with bulky waste skips on a split level on the left as they enter the HWRC and smaller specialist waste recycling containers (e.g.


Technical Note 4

batteries, oil, etc) on the right before they leave the facility. The long access road also allows for public traffic to queue within the site during operational hours so it is unlikely to back-up to obstruct the WTS and IVC HGV traffic which will turn off before the HWRC site..

In addition the new location provides a larger footprint which can accommodate more recycling containers and a wider range of recycling facilities. The new layout will also allow some recycling of residual (black bag) wastes to be undertaken at the site. Expansion of the range of recycling facilities will assist in IACC meeting its statutory recycling targets.

The new layout also means that all the recycling containers can be accessed for emptying during pubic opening times without the need to temporarily close the site, as is currently the case.

The revised proposals would enable the current concrete yard area of the existing HWRC site to be used for storage of bulky items and waste electrical equipment (WEE) on areas of hardstanding.

Finally the construction of the new HWRC facility can be undertaken with the existing facility remaining in operation as the two are located on largely separate sites.

5. Consents and Permissions

5.1 Planning Permission The proposed relocation of the HWRC will require planning permission and a planning application should be submitted and approvals gained prior to tendering the works for construction. In this way any planning conditions would be known and included with the tender documents, and any revisions to the specifications, etc resulting from conditions put into effect.

Early discussions with the regional waste planning officers should be undertaken to ensure they are aware of the planned changes at the site and to establish a good dialogue with them. A pre-application meeting is proposed to discuss the content of the application and supporting information. There are not considered to be any significant issues that could result in the refusal of planning for the site. The planning application would take a minimum of eight weeks for determination.

5.2 Environmental Permitting The existing Environmental Permit for the HWRC facility is dated and the proposed relocation of the facility and improved provision of services would make the current Permit invalid. An application for a specific Environmental Permit for the new facility will therefore be required. A standard rules permit application might be suitable for the facility but a bespoke permit may be required as there is no onsite provision for foul drainage from waste storage areas to sewer. The determination period for a standard rules application is three months and the Permit would need to be in place prior to the operation of the upgraded facility.


Technical Note 5

5.3 Other Considerations

5.3.1 Drainage A variation to the land drainage consent for the waste transfer station (WTS) may be required to accommodate additional surface water drainage from the relocated and upgraded HWRC site. Waste storage areas (e.g. skips and containers) should normally be provided with secondary containment. This is difficult at the Penhesgyn site as there is no foul sewer connection. Drainage requirements should be determined with the Environment Agency in parallel with preparation of the planning and environmental permit applications.

A new oil/water interceptor would be required on the surface water discharge from the facility.

6. Preliminary Cost Estimate

6.1 Construction Cost A provisional construction cost estimate for the preferred option is £731,500 ex VAT. This includes a provisional 10% contingency. A provisional breakdown of construction costs is given in Table 6.1.


Technical Note 6

Table 6.1 Provisional Construction Cost Estimate

Work Element Provisional Cost Estimate (£)

Contractors preliminaries and method related charges 130 000

Earthworks 50 000

Drainage 70 000

Services provision and alteration 20 000

Fencing and barriers 35 000

Concrete surfacing 120 000

Highways and associated works 60 000

Structural concrete (including retaining walls) 110 000

Structural steelwork platforms 25 000

Electrical including lighting and CCTV columns 25 000

Miscellaneous 2 500

Road marking signs etc 5 000

Site clearance, demolition etc 10 000

Commissioning 2 500

Subtotal 665 000

Allow 10% Contingency 65 500

Total Construction Estimate (ex VAT) 731 500

6.2 Other Costs Not included in construction costs but which should be considered in overall scheme costs are the following:

• Provision of any new site HWRC control office by the site entrance (assumed to be a portacabin only) including the cost of services connections – estimate £10,000;

• Costs of preparing tender documents, tendering and evaluation, construction management and supervision – estimate £40,000; and

• Planning and Environmental Permit application preparation and application fees – estimate £12,000.

6.3 Total Cost Estimate For budgeting purposes the total cost estimate for the scheme including construction costs, consultant and third party fees is £793,500. There would be some potential savings if the


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© AMEC Environment & Infrastructure UK Limited

Appendix A Drawings 3 Pages

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Appendix B Outline Programme 1 Page

© AMEC Environment & Infrastructure UK Limited

ID Task Name Duration Start Finish

1 IACC Approvals and Consultant Appointment 100 days Thu 04/08/11 Tue 03/01/12

2 Budget approvals 60 days Thu 04/08/11 Thu 27/10/11

3 Develop consultant brief 15 days Fri 28/10/11 Thu 17/11/11

4 Tender period 20 days Fri 18/11/11 Thu 15/12/11

5 Appoint consultants 5 days Fri 16/12/11 Tue 03/01/12

6

7 Design and Coonstruction 221 days Wed 04/01/12 Wed 07/11/12

8 Detailed design and tender docs 60 days Wed 04/01/12 Tue 27/03/12

9 Issue tenders 1 day Wed 28/03/12 Wed 28/03/12

10 Tender period 25 days Thu 29/03/12 Wed 02/05/12

11 Tender review 20 days Thu 03/05/12 Wed 30/05/12

12 Contract award 1 day Thu 31/05/12 Thu 31/05/12

13 Contractor mobilisation 20 days Fri 01/06/12 Thu 28/06/12

14 Construction period 80 days Fri 29/06/12 Thu 18/10/12

15 Phased opening 14 days Fri 19/10/12 Wed 07/11/12

16 Planning Permission 86 days Wed 15/02/12 Wed 13/06/12

17 Planning application preparation 25 days Wed 15/02/12 Tue 20/03/12

18 Planning submission 1 day Wed 21/03/12 Wed 21/03/12

19 Planning determination 50 days Thu 22/03/12 Wed 30/05/12

20 Review conditions 10 days Thu 31/05/12 Wed 13/06/12

21 Environmental Permitting 70 days Wed 28/03/12 Tue 03/07/12

22 Environmental permit application preparation 20 days Wed 28/03/12 Tue 24/04/12

23 EP determination 40 days Wed 25/04/12 Tue 19/06/12

24 Review Conditions 10 days Wed 20/06/12 Tue 03/07/12

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Task Split Progress Milestone Summary Project Summary External Tasks External Milestone Deadline

Penhesgyn HWRC Option 2 v2.mpp Page 1 AMEC

Project: Penhesgyn HWRC Option 2 vDate: Fri 16/09/11

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Penhesgyn HWRC – Summary of Proposed Redevelopment 1 ...democratiaeth.ynysmon.gov.uk/Data/Bwrdd y... · decommissioning of the existing weighbridge would not be appropriate at this