ROYAL ARSENAL Buildings 10, 11 and Royal Carriage Square Foul Sewage & Utilities Report

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1 ROYAL ARSENAL Buildings 10, 11 and Royal Carriage Square Foul Sewage & Utilities Report

2 Submitted to Berkeley Homes (East Thames) Limited Submitted by AECOM Scott House Alençon Link Basingstoke Hampshire RG21 7PP United Kingdom Buildings B10, B11 and Royal Carriage Square Foul Sewerage and Utilities Report

3 AECOM RAR Heritage Buildings Foul Sewerage and Utilities Report Page i Prepared by: Dimitrios Gkraikis Checked by: Emma Hayward Senior Civil Engineer Senior Utilities Coordinator Approved by: Mike Wells Technical Director Rev No Comments Checked by Approved by Date 0 Draft report EH MW 20/07/ Final EH MW 27/07/2016 Scott House, Alençon Link, Basingstoke, Hampshire, RG21 7PP, United Kingdom Telephone: Website:

4 AECOM RAR Heritage Buildings Foul Sewerage and Utilities Report Page ii Limitations AECOM Infrastructure & Environment UK Limited (hereafter referred to as AECOM ) has prepared this Report for the sole use of Berkeley Homes (East Thames) Limited in accordance with the Agreement under which our services were performed. No other warranty, expressed or implied, is made as to the professional advice included in this Report or any other services provided by AECOM. This Report is confidential and may not be disclosed by the Applicant or relied upon by any other party without the prior and express written agreement of AECOM, which agreement shall not be unreasonably withheld. The information contained in this Report is based upon information provided by others and upon the assumption that all relevant information has been provided by those parties from whom it has been requested and that such information is accurate. Information obtained by AECOM has not been independently verified by AECOM, unless otherwise stated in the Report. The methodology adopted and the sources of information used by AECOM in providing its services are outlined in this Report. The work described in this Report is based on the conditions encountered and the information available during the said period of time. The scope of this Report and the services are accordingly factually limited by these circumstances. AECOM disclaim any undertaking or obligation to advise any person of any change in any matter affecting the Report, which may come or be brought to AECOM s attention after the date of the Report. Certain statements made in the Report that are not historical facts may constitute estimates, projections or other forward-looking statements and even though they are based on reasonable assumptions as of the date of the Report, such forward-looking statements by their nature involve risks and uncertainties that could cause actual results to differ materially from the results predicted. AECOM specifically does not guarantee or warrant any estimate or projections contained in this Report. Unless otherwise stated in this Report, the assessments made assume that the sites and facilities will continue to be used for their current purpose without significant changes. Copyright This Report is the copyright of AECOM Infrastructure & Environment UK Limited. Any unauthorised reproduction or usage by any person other than the addressee is strictly prohibited.

5 AECOM RAR Heritage Buildings Foul Sewerage and Utilities Report Page 3 Contents 1 Introduction Proposed Development Background Site Description Foul Water Drainage Existing Proposed Utilities Assessment Existing Proposed... 9 List of Appendices Appendix A. Thames Water Sewer Records Appendix B. Utilities Survey Map

6 AECOM RAR Heritage Buildings Foul Sewerage and Utilities Report Page 4 List of Tables Table 2-1. Summary of estimated foul water discharge rates from Building Table 2-2. Summary of estimated foul water discharge rates from Building Table 3-3. Load assessment... 9 List of Figures Figure 1-1. Site location plan with indicative site boundary shown in red (Contains Google Aerial Imagery)... 6 Figure 2-1. Foul Water Drainage Plan received by Buro Happold... 8

7 AECOM RAR Heritage Buildings Foul Sewerage and Utilities Report Page 5

8 AECOM RAR Heritage Buildings Foul Sewerage and Utilities Report Page 6 1 Introduction 1.1 Proposed Development The proposed development includes the change of use and redevelopment of two Grade II Listed Buildings to provide a residential led mixed-use development comprising 146 residential units with refuse/recycling and cycle parking, 2,150m 2 commercial uses and a public square The proposed development consists of the refurbishment and extension of both buildings to include both residential and commercial units. 1.2 Background This design report has been prepared to identify the existing drainage network and present foul water drainage and utilities strategies for Buildings 10 and 11 of the Royal Arsenal Masterplan development This report also contains a review of previous foul drainage and utilities studies that have been carried out for the site and the wider Royal Arsenal Masterplan. 1.3 Site Description The proposed development is located to the south of Arsenal Way, in the London Borough of Greenwich. The two buildings are Grade II listed Royal Arsenal heritage buildings, the Officers House (Building 11) and The Royal Carriage Factory (Building 10). The River Thames is approximately 300m to the north of this part of the development. Figure 1-1. Site location plan with indicative site boundary shown in red (Contains Google Aerial Imagery)

9 AECOM RAR Heritage Buildings Foul Sewerage and Utilities Report Page 7 2 Foul Water Drainage 2.1 Existing The existing foul water network within the area according to the Thames Water records is as shown in the plan in Appendix A. A utilities survey carried out by Geotec Surveys Limited (Appendix B) confirms the alignment of the sewer network shown in the Thames Water records, though does not provide further details of pipe invert levels. 2.2 Proposed The assessment of the foul water discharge rate from the residential and commercial units given in Table 2-1 and Table 2-2 has been made using the following assumptions: Residential: foul water generated at a rate of 4,000litres/unit/day (Sewers for Adoption, 7th Edition); and Commercial: foul water generated at a rate of 200 litres/day/100m 2 of commercial floor area. Table 2-1. Summary of estimated foul water discharge rates from Building 10 Building Use Number of Units / Floor Area Foul Water Flows (l/s) Residential 114 units 5.28 Commercial 1747m Total 5.32 Table 2-2. Summary of estimated foul water discharge rates from Building 11 Building Use Number of Units / Floor Area Foul Water Flows (l/s) Residential 34units 1.57 Commercial 403m Total The total foul water discharge rate from the proposed development is therefore anticipated to be 6.90l/s It is proposed that the existing connections to the private foul sewer network from the existing buildings are reused for the discharge of foul water from both Building 10 and Building 11 of the proposed development. These sewers drain in a south-easterly direction before connecting to the public combined trunk sewer in Plumstead Road. This drainage route is highlighted in yellow in Figure From the depth to soffit data provided by the Utilities Survey and the information provided by Buro Happold, it is likely that the pipe gradient of the 300mm Ø sewer passing Building 10 is no slacker than 1/250. On this assumption, it has a capacity of not less than 62l/s. The proposed development generates a total flow of 6.9l/s or just under 10% of the capacity of the pipe. Subject to the confirmation of these assumptions, it is highly unlikely that the outfall sewer shown in Figure 2.1 does not have the capacity to service Buildings 10 and The detailed drainage design will include confirmation that sewers and connection points are in satisfactory condition, have suitable invert levels and have sufficient capacity to convey the anticipated foul water flows.

10 AECOM RAR Heritage Buildings Foul Sewerage and Utilities Report Page 8 Figure 2-1. Foul Water Drainage Plan received by Buro Happold

11 AECOM RAR Heritage Buildings Foul Sewerage and Utilities Report Page 9 3 Utilities Assessment 3.1 Existing Drawing number MEP806 has been provided by Buro Happold Consulting Engineers and shows the location of the proposed and existing services for the building adjacent to Building 10. This plan shows that both the existing and proposed electric, gas, water and telecoms services are located within the footways and carriageways and should therefore not be affected by Building It is recommended that a GPR survey is undertaken in the areas around Buildings 10 and 11 to confirm that no utility services will be affected by the construction works The contractor should adhere to the HSE publication HS(G)47, Avoiding Danger from Underground Services when working in close proximity to any underground services. 3.2 Proposed Energy Centre With regards to the Energy Centre, the SSE detailed study confirms that an allowance has been made for Buildings 10 and SSE assessed the number of apartments to be constructed for Buildings 10 and 11 and have allocated a peak load and a diversified load for each building; they have also produced a drawing indicating the proposed points of connection for Buildings 10 and 11. The M&E consultant and architects have confirmed that the points of connection are suitable for the building layouts in relation to the location of the plant rooms. Proposed Utility Services Buro Happold Construction Plan drawing number MEP806 Rev 02, shows the existing services and proposed services for the building adjacent to Building On review of this drawing it is noted that there are new proposed services in the roads and footpath in Arsenal Way The utility services located within the existing infrastructure could be used to serve Buildings 10 & The detailed utilities infrastructure design will include confirmation with regards to the points of connection for the electric, water and telecoms, any additional substations required for the two new buildings and that the existing infrastructure has sufficient capacity for the two new buildings A load assessment based on the area schedule provided by the design architects (Allford Hall Monaghan Morris) has been carried out. Table 3-3. Load assessment Building Electric Gas Water Building 10 Commercial 300kVA in total To be confirmed by individual tenants, however a minimum of 100amp 3 phase should be provided to each commercial unit 370kWh per unit (this has been based on a restaurant requirements. Building 10 Residential 242kVA No gas cooking heating and hot water to be provided by Energy Centre. Building 11 Commercial 100 kva in total. To be confirmed by individual tenants, however a minimum of 100amp 3 phase should be provided 370kWh per unit (this has been based on restaurant requirements). Minimum of 1.0l/s for each commercial unit Based on 50% storage of 9,420 litres 4hrs refill rate incoming flow rate = 0.65l/s Minimum of 1.0l/s for each commercial unit

12 AECOM RAR Heritage Buildings Foul Sewerage and Utilities Report Page 10 to each commercial unit. Building 11 Residential 75kVA No gas cooking heating and hot water to be provided by Energy Centre. Based on 50% storage of 2720 litres with 4hr refill rate incoming flow rate = 0.19l/s Note that the above figures are to be used as a guide only and are not for use in any application to the utility companies. A detailed calculation will need to be undertaken based on the final design, number of commercial units and residential dwellings for each building.

13 AECOM RAR Heritage Buildings Foul Sewerage and Utilities Report Page 11 Next Steps It is recommended that a detail load assessment is undertaken for Buildings 10 and 11 to establish the exact load requirements for both buildings This information, along with a site layout plan, can be used to contact the utility companies that have already installed their apparatus in the area and seek formal quotations to provide new supplies to Buildings 10 and 11. Until such time that the utility companies have confirmed they can provide supplies from the existing infrastructure, there is a possibility that off-site reinforcement will be required SSE have already ensured that the Energy Centre has sufficient capacity for both buildings and have provided a design showing the routes and points of connection for the district heating system The contractor should undertake a GPR survey prior to any construction work commencing to satisfy themselves that the location of the existing and any new services installed as part of the wider scheme will not be affected by the works to be undertaken on Buildings 10 and 11.

14 AECOM Job Title Page A-1 Appendix A. Thames Water Sewer Records

15 BUILDING 11 BUILDING 10

16 AECOM Job Title Page B-1 Appendix B. Utilities Survey Map

21 About AECOM AECOM (NYSE: ACM) is a global provider of professional technical and management support services to a broad range of markets, including transportation, facilities, environmental, energy, water and government. With approximately 100,000 employees around the world, AECOM is a leader in all of the key markets that it serves. AECOM provides a blend of global reach, local knowledge, innovation, and collaborative technical excellence in delivering solutions that enhance and sustain the world s built, natural, and social environments. A Fortune 500 company, AECOM serves clients in more than 100 countries and has annual revenue in excess of $6 billion. More information on AECOM and its services can be found at Scott House Alençon Link Basingstoke Hampshire RG21 7PP United Kingdom

Primary access to the site is proposed from two locations along the B3420 Andover Road, and a secondary access from Well House Lane.

Primary access to the site is proposed from two locations along the B3420 Andover Road, and a secondary access from Well House Lane. 17. SERVICES 17.1 Introduction 17.1.1 WSP Development Limited has been appointed by CALA Homes to investigate and appraise the availability of services to serve a proposed mix-use development of approximately