The Northolt Feasibility Study

MRD Northolt

Development Feasibility Study Report

Metropolitan Police Service Gleeds Building Surveying Ltd Project LNBS0694

Version: 2 Date: June 2019

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DOCUMENT CONTROL

Project name MRD Northolt – Development Project number LNBS0694 Date of Issue June 2019 Version number 2 Reason for issue

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Project number: LNBS0694 / Version: 1 / Issue date: December 2018

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Contents

1.0 Executive Summary ...... 1

2.0 Introduction ...... 6 2.1 The Brief...... 6 2.2 Site Visits ...... 6 2.3 Engagement meetings ...... 7

3.0 Architectural Proposals ...... 8 3.1 Staff Facilities, Common elements, standards, and welfare ...... 8 3.1.1 Visitor Parking ...... 8 3.1.2 Vehicle Access / Egress ...... 8 3.1.3 Reception Building / Area ...... 9 3.1.4 Toilet and Shower Accommodation ...... 9 3.1.5 Staff Numbers...... 10 3.1.6 Agile office Workstation Space Calculations / areas ...... 12 3.1.7 Vehicle movements and outline vehicle lift proposals ...... 13 3.1.8 Vehicle Recovery and Examination Services (VRES) - Requirements ..... 17 3.1.9 Forensic Services – Requirements ...... 18 3.1.10 Road and Transport Policing Command (RTPC) – Requirements ...... 18 3.2 Department Adjacencies ...... 19 3.3 Schedules of Accommodation ...... 23 3.4 MRD Northolt Site ...... 30 3.4.1 Preferred Site ...... 30 3.4.2 Site Access ...... 31 3.4.3 Traffic Assessment ...... 31 3.4.4 Public Transport ...... 34 3.4.5 Flood Risk...... 35 3.5 Options ...... 39 3.5.1 Option 1 - Overview ...... 39 3.5.2 Option 2 – Overview ...... 39 3.5.3 Option 3 – Overview ...... 40 3.5.4 Option 4 – Overview ...... 41 3.5.5 Option 5 – Overview ...... 42 3.6 Summary Schedule of Vehicle Capacities per Option ...... 43 3.7 Outline Specification ...... 44 3.8 BIM ...... 55

4.0 Mechanical, Electrical and Public Health Services ...... 57 4.1 Introduction ...... 57 4.1.1 Purpose of this Report ...... 57 4.1.2 Basis of Design ...... 57 4.2 Project Overview ...... 58 4.2.1 Project Description ...... 58 4.3 Plant Strategy ...... 58

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4.3.1 Project Equipment Resilience ...... 58 4.3.2 Plant Access ...... 59 4.3.3 Major Plant Replacement Overview ...... 60 4.3.4 Asset Performance ...... 60 4.4 Utilities...... 61 4.4.1 Existing Utilities, Diversions and Enabling Works ...... 61 4.4.2 Provision for and Liaison with Utility Providers ...... 62 4.5 Design Conditions ...... 62 4.5.1 External Design Temperatures ...... 62 4.5.2 Ventilation Rates ...... 62 4.5.3 Ventilation Filtration ...... 63 4.5.4 Internal Design Temperatures ...... 63 4.5.5 Plant Acoustic Criteria ...... 63 4.5.6 Domestic Hot and Cold Water Services ...... 63 4.5.7 Sanitary Plumbing ...... 64 4.5.8 Internal Gains ...... 64 4.6 Energy and Sustainability ...... 64 4.6.1 Energy Compliance ...... 64 4.6.2 Energy Strategy Methodology ...... 65 4.6.3 Energy Strategy Results ...... 67 4.7 Mechanical and Public Health Services ...... 69 4.7.1 Specialist Design Items ...... 69 4.7.2 Foul Drainage – Above Ground ...... 69 4.7.3 Incoming Mains Cold Water...... 70 4.7.4 Domestic Cold-Water Distribution ...... 70 4.7.5 Domestic Hot Water Systems ...... 70 4.7.6 Cooling and Heating Systems ...... 71 4.7.7 Local Cooling ...... 72 4.7.8 Central Heating and Cooling...... 72 4.7.9 Central Ventilation ...... 73 4.7.10 Local and Special Ventilation...... 73 4.8 Electrical Services ...... 74 4.8.1 Electrical Incoming Services Design ...... 74 4.8.2 Electric Mains and Sub-Mains Distribution ...... 75 4.8.3 Power Installations ...... 79 4.8.4 Lighting Installations ...... 80 4.8.5 Uninterruptable Power Systems (UPS) ...... 82 4.8.6 Earthing and Bonding Systems ...... 82 4.8.7 Vertical Transportation ...... 83 4.8.8 Fire and Lightning Protection ...... 83 4.8.9 Communication and Security Control Systems...... 84 4.9 Central Building Management System ...... 86

5.0 Civil / Structural Design Philosophy ...... 87 5.1 General Project Information ...... 87 5.1.1 Introduction ...... 87 5.1.2 The Buildings ...... 87 5.2 Structural Scheme ...... 87

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5.2.1 Foundations ...... 87 5.2.2 Floor Slab ...... 88 5.2.3 Structural Frame ...... 88 5.2.4 Roof ...... 89 5.2.5 Stability ...... 89 5.3 Civil Scheme ...... 90 5.3.1 Access ...... 90 5.3.2 Internal Vehicle Movements ...... 90 5.3.3 Topography ...... 90 5.3.4 Surface Water Drainage ...... 91 5.3.5 Foul Drainage ...... 91 5.4 Scope of Service ...... 92 5.4.1 Contractor Designed Elements ...... 92 5.5 Materials...... 92 5.6 Design Codes of Practice ...... 92 5.7 Loadings...... 93 5.7.1 Imposed Loads - Roof ...... 93 5.7.2 Imposed Loads – Floors ...... 93 5.7.3 Imposed Loads – Wind ...... 93

6.0 Sustainability ...... 94 6.1 Draft Route to Compliance ...... 94 6.1.1 Part L2A 2013 Building Regulations Compliance ...... 94 6.1.2 The London Plan ...... 94 6.1.3 Ealing Local Planning Authority ...... 94 6.1.4 MPS Targets...... 94 6.1.5 Compliance Review ...... 95 6.2 Sustainable Design Checklist ...... 96 6.3 BREEAM Preliminary Pre-Assessment ...... 96 6.3.1 BREEAM Assessor Comments ...... 96 6.3.2 Credit Summary ...... 97 6.4 BREEAM 2018 New Construction Early Actions ...... 97 6.5 Details of Early Action Credits – RIBA Stage 1-2 ...... 99 6.5.1 MAN 01: Sustainability Champion (Design) ...... 99 6.5.2 TRA 05: Travel Plan ...... 99 6.5.3 MAT 06: Material Efficiency Review ...... 99 6.5.4 LE 02: Ecological Enhancement ...... 100 6.5.5 LE 03: Ecological Enhancement ...... 101 6.5.6 LE 04: Ecological Enhancement ...... 102 6.6 Details of Early Action Credits – RIBA Stage 2 ...... 102 6.6.1 MAN 01: Stakeholder Consultation (Project Delivery) ...... 102 6.6.2 MAN 01: Stakeholder Consultation (Third Party) ...... 103 6.6.3 MAN 02: Lifecycle Cost and Service Life Planning ...... 104 6.6.4 HEA 02: Indoor Air Quality (IAQ) Plan ...... 104 6.6.5 HEA 06: Security ...... 104 6.6.6 ENE 01: Reduction of Carbon Dioxide Emissions ...... 105 6.6.7 ENE 04: Passive Design ...... 105 6.6.8 ENE 04: Low Carbon Design ...... 106

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6.6.9 MAT 01: Life Cycle Assessment ...... 106 6.6.10 MAT 03: Responsible Sourcing of Construction Products ...... 108 6.6.11 WST 01: Pre-Demolition Audit ...... 108 6.6.12 WST 05: Adaptation to Climate Change ...... 109 6.6.13 WST 06: Functional Adaptability ...... 109 6.7 Travel Assessment & Sustainable Transport Measures ...... 110 6.7.1 TRA 01: Travel Plan ...... 110 6.7.2 TRA 02: Sustainable Transport Measures ...... 110 6.7.3 Compliant Cycle Storage Spaces ...... 112 6.7.4 Compliant Cycle Facilities...... 112 6.7.5 Relevant Amenities Applicable for Options 9 and 10 ...... 113

7.0 Legislative Considerations and Programme ...... 114 7.1 Planning Permission ...... 114 7.2 Listed Building Consent...... 114 7.3 Building Regulations and Building Control Approval ...... 114 7.4 Programme ...... 114

8.0 Feasibility Cost Estimate ...... 115 8.1 Feasibility Cost Plan - Notes ...... 115 8.2 Feasibility Cost Plans - Summary ...... 116

Appendices Appendix A – MPS User Requirements Appendix B – MPS Perivale CCTV and Door Access Replacement Appendix C – MPS Perivale Operational Requirement and Security Measures Appendix D – MPS VRES Requirements V4 Appendix E – MPS VRES Accommodation User Brief Appendix F – MPS Forensic Requirements Appendix G – MPS Forensics Accommodation User Brief Appendix H – MPS RTPC Accommodation User Brief Appendix I – Security Outline Design Requirement Appendix J – Typical Vehicle Data Appendix K – Draft BRUKL Appendix L – Utilities Search Appendix M – Sustainable Design Checklist Appendix N – BREEAM Preliminary Assessment Appendix O – Outline Programme Appendix P – Feasibility Cost Plans Appendix Q – Schedule of Photographs

Refer to the separate drawings pack for the architectural, MEP and civil/structural drawings

Project number: LNBS0694 / Version: 1 / Issue date: December 2018

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1.0 Executive Summary

In accordance with instructions received from Cliff Jones of the Metropolitan Police Service (‘MPS’) Gleeds Building Surveying Limited have prepared this RIBA 1 Feasibility Study Report in relation to the proposed relocation of MPS car compound from the Perivale site to MRD Northolt.

It is understood that the MPS hold a leasehold interest in the Perivale site, with lease due to expire in 2021, and that the MPS hold the freehold interest in the site at MRD Northolt.

We were provided with a user brief, and undertook site visits of both Perivale and MRD Northolt, as well as Charlton Car Pound. Furthermore, we attended a number of consultation meetings and presentations with the following departments:

 Vehicle Recovery and Examination Services (VRES)  Forensic Services  Road and Transport Policing Command (RTPC)

Each of these departments had their own brief, and copies are provided within the appendices.

The site at MRD Northolt is smaller than the site at Perivale, and so 5 options were developed in order to achieve the brief. These 5 options have been summarised below:

Option 1

Option 1 is for the re-provision of the VRES services at the MRD Northolt site. The solution is based upon the demolition of the existing buildings on the site and the building of a two storey entry building to provide reception, office and staff welfare facilities. In addition to storage facilities of equipment and items recovered from vehicles. Vehicles will be stored externally and no internal vehicle storage areas will be provided as part this option. Ground level solution only.

The option assumes that Forensics & RTPC at Perivale are retained and that the new site boundary is provided with additional security around the retained site at Perivale and build new VRS facilities at MRD Northolt.

Option 2

Option 2 is for the re-provision of the VRES services and hanger B storage on a like for like basis at the MRD Northolt site. The solution is based upon the demolition of the existing buildings on the site and the building of a two storey entry building to provide reception, offices for both VRES & Forensics teams and staff welfare facilities, in addition to storage facilities for VRES equipment and items recovered from vehicles. An internal storage area has been included to replicate hanger B at Perivale. The design option includes initial internal space allowance for vehicles located within large bays. These areas would require additional engagement meetings with VRES and Forensics should this option be taken forward.

The majority of vehicles will be stored externally and only minimal internal vehicle storage has been included within this option. Ground level solution only.

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This option assumes that both Forensics & RTPC will be primarily based in at Perivale. Hanger B would not be available.

Option 3

Option 3 is for the re-provision of the VRES services to meet the MPS brief Vehicle numbers and hanger B storage on a like for like basis at the MRD Northolt site. The solution is based upon the demolition of the existing buildings on the site and the building of a two storey entry building to provide reception, offices for both VRES & Forensics teams and staff welfare facilities. In addition to storage facilities for VRES equipment and items recovered from vehicles. Internal storage areas have been included to replicate hanger B at Perivale. The design option includes initial internal space allowance for vehicles located within large bays. These areas would require additional engagement meetings with VRES and Forensics should this option be taken forward.

This option includes 2 upper decks for vehicle parking. The design allows for both ramp and vehicle lift access to / from the upper levels. The majority of vehicles will be stored under cover with additional external vehicle storage at ground level.

This option assumes that both Forensics & RTPC will be primarily based in at Perivale. Hanger B would not be available.

Option 4

Option 4 is for the re-provision of the VRES services to meet the MPS brief Vehicle numbers, RTPS / Forensics investigation areas and hanger B storage at the MRD Northolt site. This will allow the vacation of the Perivale site.

The solution is based upon the demolition of the existing buildings on the site and the building of a three storey entry building to provide reception, offices for both VRES & Forensics teams and staff welfare facilities.

In addition to stand-a-lone storage facilities for VRES equipment and items recovered from vehicles.

Internal Forensic and RTPC investigation and dedicated internal storage areas have been included to replicate both at Perivale.

This option includes 2 upper decks for vehicle storage / parking. The design allows for both ramp and vehicle lift access to / from the upper levels. The majority of vehicles will be stored under cover with additional external vehicle storage at ground level.

This option assumes total vacation of the Perivale site.

Option 5

Option 5 is for relocation of the Forensics teams only from Perivale to MRD Northolt MO4 (RTPC) and MO8 (Forensics). VRES will remain at Perivale, requiring partial retention of the Perivale site. Internal space and layouts are the same as option 4 but external storage for vehicles has been reduced to 600. Option 5 includes public reception, office space, lockers, welfare facilities and support accommodation for both services. Vehicle locks, vehicle drop off and visitor parking are all included as previous options.

The option requires demolition of the existing buildings on the MRD Northolt site and the construction of a single storey structure to provide the accommodation listed above, and two levels for vehicle storage/ parking with both ramp and vehicle lift access between levels. The top level of storage/ parking is at roof level and is not covered.

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The table below summarises the requirements as set out in the brief, and the provisions within each of the 5 options:

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A separate drawing pack has been developed comprising architectural drawings for all 5 options, along with MEP and CS engineering drawings for option 4 and 5.

The MPS brief included that the development would need to achieve a BREEAM ‘Very Good’ rating. We have prepared and included within this report a preliminary pre-assessment. Based on the current proposals, we believe that the project can achieve a ‘Very Good’ rating.

The BREEAM 2018 New Construction provides for early actions, some of which are required to take place at RIBA 2 Concept Design Stage. We have incorporated a non-exhaustive list of key actions that would be required at RIBA 2 Concept Design stage to achieve the required ‘Very Good’ rating.

We would advocate that as many of the early stage actions are completed as possible to maximise the BREEAM score. Missing these opportunities now can result in the assessment being handicapped, as the credits cannot be retrospectively secured later. One early stage action recommended is the appointment of an ecologist to carry out surveys prior to any further work being completed, mainly due to the close proximity of the canal. Early stage credits also tend to be relatively inexpensive to achieve and can make a significant impact on the sustainability of a building.

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We have prepared a feasibility cost estimate for each of the 5 options and these are set out below: SUMMARY

Item Description Option 1 Option 2 Option 3 Option 4 Option 5

1 Site Clearance £142,177 £142,177 £142,177 £142,177 £142,177 2 Demolition £1,250,000 £1,250,000 £1,250,000 £1,250,000 £1,250,000 3 Surface level car park £3,521,700 £3,276,180 £4,262,195 £2,032,020 £2,684,875 4 Building Construction £2,390,400 £4,576,000 £18,722,340 £29,387,672 £16,486,197 5 Utilities and site services £750,000 £750,000 £750,000 £750,000 £750,000 6 E/O for renewables - - - - - 7 External Works £100,000 £100,000 £100,000 £100,000 £100,000 8 Security fence and gate £650,000 £650,000 £650,000 £650,000 £650,000 9 Drainage over the site £264,043 £264,043 £264,043 £264,043 £264,043 10 Licences & planning fees (allowance) Included Included Included Included Included 11 S106 allowance £850,000 £850,000 £850,000 £850,000 £850,000 12 Asbestos removal allowance £500,000 £500,000 £500,000 £500,000 £500,000 13 IT containment & cabling - - - - - 14 Ground contamination risk £1,000,000 £1,000,000 £1,000,000 £1,000,000 £1,000,000 15 Repair work to Canal bank £500,000 £500,000 £500,000 £500,000 £500,000 Sub-total £11,918,320 £13,858,400 £28,990,755 £37,425,912 £25,177,292 16 Contingency/Risk (5%)* £553,416 £650,420 £1,407,038 £1,828,796 £1,216,365 Sub-total £12,471,736 £14,508,820 £30,397,793 £39,254,708 £26,393,657 17 Professional fees (15%)* £1,743,260 £2,048,823 £4,432,169 £5,760,706 £3,831,548 Sub-total £14,214,996 £16,557,643 £34,829,962 £45,015,414 £30,225,205 18 Furniture, fixtures & equipment £100,000 £150,000 £500,000 £500,000 £500,000 Total** £14,314,996 £16,707,643 £35,329,962 £45,515,414 £30,725,205 *Percentage applied to sub-total above excluding Item 11 **Excluding PSD staff costs and digital policing costs

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2.0 Introduction

2.1 The Brief

Gleeds were appointed at the end of September 2018 to undertake an RIBA Stage 1 study into the potential of moving MPS Vehicle Recovery & Examination Services (VRES), Forensic Services and Road & Transport Policing Command (RTPC) facilities which are currently located at the The Bilton Centre, Walmgate Road, Perivale, Ealing, UB6 7LR to an alternative site known as MRD Northolt, Rowdell Road, Northolt, Middlesex, UB56AG which is currently used a Metropolitan Police Vehicle workshops.

Departments considered:

 Vehicle Recovery and Examination Services (VRES)  Forensic Services  Road and Transport Policing Command (RTPC)

This feasibility outlines five scenarios for the partial relocation of departments, relocation of individual elements or total relocation / vacation of the Perivale site.

Each of these Departments has its own set of specific requirements which are detailed in section 3.4.

2.2 Site Visits

The project team lead by Gleeds and supported by Harley Haddow Consulting Engineers and IBI visited the existing facilities at Perivale site on the morning of Tuesday 25th September 2018, followed by an afternoon visit to the MRD Northolt site. Refer to existing site photographs of both site in Appendix Q.

The Perivale site has its principle vehicle and public access off Walmgate Road, Building C houses the main public reception to the site, including office spaces, staff welfare etc. provides the main Forensics and RTPC functions with adjoining office accommodation. Whilst provides secure covered vehicle storage spaces and forensics inspection area. The remainder of the site has open vehicle storage parking. Refer to site block plan below.

A site visit was also arranged to MPS Vehicle compound at Charlton 8 Bramsholt Avenue, Charlton, London, SE7 7HY, on Tuesday 4th October 2018. The Charlton site which has recently improved the public / staff entrance areas. Refer to the existing sketch arrangement plans and photographs in Appendix Q.

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2.3 Engagement meetings

A number of meetings have taken place with MPS, VRES, Forensics and RTPS.

The initial start-up meeting and site visits took place on Tuesday 25th September 2018 at Perivale.

A meeting was held Monday 15th October at the Empress State Building with MPS, Forensics, RTPC, CTSA and the design team. IBI tabled an initial schedule of accommodation, department adjacency diagrams and sketch options indicating their understanding from the written MPS brief and site visits.

A meeting was held Friday 26th October at the Empress State Building with MPS, Forensics, RTPC, CTSA and the design team. IBI presentation of proposal following the comments received at the meeting on the 15th October.

A meeting was held on Monday 5th November at the Empress State Building with MPS, Forensics and the design team. To review the design options.

A Skype / Video call meeting was held on Tuesday 13th November with MPS to review the proposed vehicle numbers and options.

A meeting was held Friday 16th November at the Empress State Building with MPS, Forensics, and the design team.– IBI made a presentation of 4 options. These were agreed in principle with option 4 being preferred.

Subsequent to this meeting we have been requested to provide a fifth option which has been added to this report.

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3.0 Architectural Proposals

3.1 Staff Facilities, Common elements, standards, and welfare

3.1.1 Visitor Parking

The RIBA stage 1 design solution includes for visitor off road car parking, 6 standard spaces and 2 disabled spaces. These will be accessed directly off Rowdell Road.

The verge between vehicle accessible areas and the building will be provided with vehicle attack / impact mitigation measures in the form of bollards or Armco barrier systems, all in compliance with the MPS Security – Outline Design Requirement – Northolt, refer to copy in Appendix J

3.1.2 Vehicle Access / Egress

The main delivery / public vehicle access to the site has been provided to the northern corner of the site, off Rowdell Road. It is provided with 2 Air locks, one for entry the other for egress, each air lock is a minimum of 7.3m wide and 26m in length. A third vehicle air lock has been provided to the western corner of the site, off Rowdell Road and again is a minimum of 7.3m wide and 26m in length, this entrance will be used for emergency access or for larger HGV’s or vehicle transporters which would access through the site on a one-way system.

Proposed Reception Building ground floor has been designed to provide lines of sight into the reception, area and vehicle locks form the gate office.

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3.1.3 Reception Building / Area

MPS have provided a detailed brief for each of the 3 services potentially being transferred to the Northolt site. As part of this RIBA stage 1 design IBI have assumed the reception building will provide a centralised secure public/visitor entrance, regardless of the department being moved and therefore will require the same accommodation as identified within the MPS brief.

As part of the engagement process the requirement for a gate control room has been included

The design includes for the following reception areas:

 Public / visitor entrance lobby / waiting  Disabled WC – Controlled public access  Triage counter standard x1  Triage counter DDA compliant x1  Public waiting  Front counter standard x3  Front counter DDA compliant x1  Counter rear office area 5 person  VRES interview room  Gate office / control room

3.1.4 Toilet and Shower Accommodation

IBI have set out in the following table their review of the toilet and shower accommodation requirements for each department in conjunction with British Standards, the Workplace Regulations 1992 and the MPS PHE Standards:

Department Welfare

Toilets

3 3

WC WC

Lockers Lockers Workers

Urinal No Office No Office - No Desks -

(note 2) (note Total Toilet Toilet Total DDA - Showers Showers Total Male of of Male Total F Unisex M provision (note (note provision Total Female of of Female Total staff (60%) Note Note (60%) staff Note (40%) staff M VRES 36 86 86 76 46 30 3 2 3 0 2 3 Forensics 6 11 5 8 5 3 1 1 1 0 0 1 RTPC 20 37 37 37 22 15 2 1 2 0 0 2 Totals 62 134 128 6 4 6 0 2 6

Each of the options has been designed to comply with both DDA requirements and Building Regulation Part M. DDA toilets, the design includes for 1 public disabled toilet and 1 staff / official visitor disabled toilet.

Note 1 - Toilet provision is based upon 80% desk occupation, 40% locker use and a 20% uplift. Note 2 - The design of showers is based upon, 1 per 30 and upon the maximum number of officers using lockers at any one time and not the total locker numbers, with an allowance for shift patterns. Note 3 - The MPS have previously advised a staffing diversity of 60% male to 40% female should be utilised as part of the feasibility reports. Based on BS6465-1:2006.

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The design includes for the following welfare facilities, numbers and quantities of facilities have been included based upon each design option, additional details are provided within each option schedule of accommodation in appendix I:

 Rest room with beverage bay  Male lockers  Male showers  Male WCs  Female lockers  Female showers  Female WCs  First aid room  Disabled locker, shower and WC

3.1.5 Staff Numbers

MPS have provided a detailed brief for each of the 3 services potentially being transferred to the Northolt site. As part of this RIBA stage 1 design IBI have reviewed and collated the staff numbers for each of the 3 services in order to provide an indication of the required welfare requirements and agile office areas. IBI have assumed both welfare and office areas will be centralised within the secure reception/ entry building.

3.1.5.1 Vehicle Recovery and Examination Services (VRES) - Staff

Currently 163 staff across 2 sites, Perivale and Charlton this includes 11 Police officers and 40 MSC officers which are likely to grow to 80 MSC officers.

The brief for MRD Northolt dated 28/07/18 included the following staffing details

Staff Staff Sharing Desk Category Description Examples Numbers Numbers Ratio Numbers Full Time Part Time

• Office based, full time, 8 0 8 1 9:10 always at this location and rarely away from desk.

Office based, attends meetings at this location • 2 9 8 2 7:10 and elsewhere. May be full time or part time.

Office based, but regularly • away from this location 3 5:10 visiting sites or on 3 26 15 operational duties. Hot desks and writing rooms for use by mobile staff, visitors and non-desk • 4 1:10 based officers. In addition 8 20 5 to desks, café / break out (incl. 50% seating should also be Growth) provided in the same area.

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Based upon the above VRES have a current total of 21 full time staff and 55 Part time staff. 20 of these are MSC officers assuming a 50% growth in MSC officers the design includes for the following:

Total Full time staff 21 Total Part time staff (including Growth) 65 Total locker spaces 86 Total Agile workstation spaces 36

3.1.5.2 Forensic Services - Staff

Currently 11 staff based at Perivale and includes

The brief for MRD Northolt dated 28/07/18 included the following staffing details

Staff Desk Sharing Category Description Examples Numbers Numbers ratio Full Time

• Office based, full time, always at 1 1 1 9:10 this location and rarely away • from desk.

Office based, attends meetings 2 2 2 7:10 at this location and elsewhere. • May be full time or part time. •

Office based, but regularly away • 3 5:10 from this location visiting sites or • L on operational duties. • 5 2

Hot desks and writing rooms for use by mobile staff, visitors and non-desk based officers. In • 4 1:10 addition to desks, café / break • 3 1 out seating should also be • provided in the same area.

Based upon the above the RIBA stage 1 design includes for the following:

Total Full / Part time staff 11 Total locker spaces 5 (as per brief) Total Agile workstation spaces 6

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3.1.5.3 Road and Transport Policing Command (RTPC) - Staff

RTPC Collison investigators are not currently located at Perivale but are located out of various offices around London. It has been confirmed that there are circa 37 officers within the RTPC and it is envisaged that 20 hot desk spaces would be required at Perivale. The exact requirements should be further investigated at the next design stage. For the purposes of this RIBA stage 1 report we have made the following assumptions:-

Total Full / Part time staff 37 Total locker spaces 37 (tbc) Total Agile workstation spaces 20

MRD Northolt Total Staff:

Department Number of Staff

VRES 86 Forensics 11 RTPC 37

Anticipated Total 134

3.1.6 Agile office Workstation Space Calculations / areas

This RIBA stage 1 design has included for workstation places based upon the above department requirements and the following MPS agile working design criteria’s either partially of as a whole depending upon each design option criteria:

Office Element Footprint per unit Ration per Workstation Sqm per Workstation Standard desk 3.00 1:1 3.00 Touchdown desk 2.16 1:10 0.22 Team storage 0.72 1:2 0.36 Personal storage 0.72 1:6 0.12 Primary circulation 1.80 1:1 1.80 Secondary circulation 0.65 1:1 0.65 Copy point 9.00 1:50 0.18 Tea Point 7.00 1:100 0.07 Break out space 37.0 1:50 0.074 Quiet room 9.00 1:25 0.36 6 person meeting room 11.0 1:80 0.14 8 person meeting room 13.0 1:100 0.13 12 person meeting room 25.0 1:150 0.17 Conference room 42.0 1:400 0.11 Total (m2) 8.04

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Summary RIBA Stage 1 Office area requirements:

Department Workstations Area Allowance Total VRES 36 8.04 289.44 Forensics 6 8.04 48.24 RTPC 20 8.04 160.80 Total 498.48

This RIBA stage 1 design includes for the following office / administration areas. Numbers and quantities of these facilities have been included based upon each design option, more details are provided within each option schedule of accommodation in appendix I.

Shared offices VRES – MSC – Forensics Services:

 VRES Admin Office 18P (3 Safes required)  Forensic Services 8P office  SCIU / RTPC 3P office  Meeting / Interview Room Required  Forensics Services Exhibit and Paperwork Room  Forensic Services Store Room  Forensic Services Studio  VRES Interview Room  VRES Briefing / Training Room  Store (Stationary)  Cleaners Room  TER Room  IT Room  Business Support Offices (VRES)  Security Office

3.1.7 Vehicle movements and outline vehicle lift proposals

As part of the RIBA stage 1 feasibility the requirement for vehicle storage within a multiple level car park. VRES requested the introduction of an option to include a vehicle lift, in addition to the vehicle ramp solution within the MRD Northolt design.

Lifts would be required to potentially carry all types of vehicles from small cars up to long wheel base vans or 4x4’s off road type vehicles. Typical vehicle to be transported can be found in appendix K.

Vehicles at Perivale are currently transferred around the site using a “Jungheinrich TFG 435s” fork lift truck, refer to details in appendix K. Vehicles can be moved by either 1 or 2 forklift trucks depending upon the severity of damage to the vehicle. The client user team have advised that once a vehicle is lifted it is preferable to pick, up move and drop into the relevant bay in one operation, rather than multiple lifts / drops.

The client users have also advised that angle vehicle parking bays are preferable to bin bays to allow suitable manoeuvring of vehicles.

The operational preference is for vehicles to not loaded or unloaded into the vehicle lift but for the forklift to accompany / transport the vehicle which is being moved.

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The diagram below indicates various arrangements for a LWB van or 4x4 movement utilising differing forklift arrangements.

Option A

Would require a platform lift of circa 7.7m wide x 6.175m deep assuming a clearance of 500mm around all sides. Required lifting weight would be circa 6.3 tonnes.

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Option B

This option below indicates an arrangement for a 4x4 off road type vehicle and two forklift which would require a platform lift of circa 9.0m wide x 5.6m deep assuming a clearance of 500mm around all sides. Required lifting weight would be circa 8.4 tonnes.

Option C The client team have confirmed when moving 4x4 vehicles the fork lifts are located at each end, see sketch option C below. This would require a lift platform 13m wide x 3.5 deep, although to maximise flexibility a lifting platform of 13m wide x 6m deep.

3.5m

13.0m

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Option D At this stage in the deign process the design team have sort advice from a lift designer who has provided a design for a 9m wide x 6.2m deep platform and associated costs for the supply and installation, see drawing below.

Vehicle Lift summary

As noted above it is possible to provide a lift to allow the movement of the majority of vehicle types but vehicle requiring twin forklifts from both a practical and Health & Safety point will have to be retained at ground floor level.

Taking into account the lifting requirement variables above a platform lift of circa 9.0m wide x 6.2m with a potential lifting capacity of circa 8.4 tonnes has been indicated within the design options. It has been assumed that vehicles will enter / exit at ground floor from opposing sides. It is assumed roller shutter doors will be provided at the entry / exit side. A clear 9m turning circle has been indicated at the front / exit sides. Refer to the site options layout makes no allowance for lift structure.

The RIBA Stage 1 options indicate a 6m wide 2 way vehicle ramp at 1:10 to each level and two vehicles lifts, to provide vehicle movement resilience.

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3.1.8 Vehicle Recovery and Examination Services (VRES) - Requirements

MPS have provided a detailed brief for each of the 3 services potentially being transferred to the Northolt site.

As part of this RIBA stage 1 design IBI have reviewed the requirements identified within the MPS brief for the VRES department. Copies of the MPS brief can be found in Appendices D&E.

As part of the engagement process the requirements for VRES vehicle storage has been reviewed at length. Each option provides the required vehicle storage capacities to a lesser or greater extent. Each option identifies a mix of vehicle types for design purposes, refer to the options vehicle summary schedule in section 3.6.

It should be noted that the diversity of vehicle types used within this feasibility are based upon the MPS written brief and IBI would recommend at the next design stage the relationships and operational requirements for differing vehicle type will require a more detailed study.

Key accommodation, areas and vehicle types included within the RIBA stage 1 design options include the following.

Vehicle Recovery and Examination Services (VRES) – External Spaces:

 Vehicle Drop Off Area – Statutory / Uninsured  Short Term Vehicle Storage – Vehicle Check  Long Term Vehicle Storage  Long Tern Motorcycle Storage  Parking for MPS Vehicles  Vehicle Drop Off Area PACE  Cars – Road worthy  Cars – Non-Road worthy – i.e. without wheels etc  Vans – Road worthy  Vans – Non-Road worth – i.e. without wheels etc o LWB Van o Rigid Truck o Artic Truck o Motorcycles o HGV Tractor units with trailers  Sightlines, mirrors / CCTV / Satnav test area  Waste Skips  Secure Store – External  Pound Equipment Store Area – External  Gas Bottle Store  Fuel Store (Diesel and Petrol)

Vehicle Recovery and Examination Services (VRES) – Internal Spaces:

 Large Exhibits Store (Trees from accidents, skips, contents of scrap yards)  Secure store – under cover  Pound equipment store – under cover (formerly Hanger C)  Pound equipment secure store – under cover (formerly Hanger C)

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3.1.9 Forensic Services – Requirements

MPS have provided a detailed brief for each of the 3 departments potentially being transferred to the Northolt site.

As part of this RIBA stage 1 design IBI have reviewed the requirements identified within the MPS brief for the Forensic department. Copies of the detailed MPS brief can be found in Appendices F & G.

As part of the engagement process the requirements for Forensics services has been reviewed at length. Each option provides the required accommodation, refer to the options accommodation schedules in Appendix I.

It has been confirmed by MPS that vehicles will be brought into the forensics area by VRES as required and VRES will be responsible for the vehicle movements / storage.

Key accommodation, areas and vehicle types included within the RIBA stage 1 design options include the following:

Forensic Services – Internal:

 Enclosed CSI Bays – CAN (Cyanoacrylate Vapour)  Enclosed Forensic Services Bays – Light Bay (with concertina access door)  Enclosed Forensic Services Bays – Forensic bays  Enclosed Forensic Services Bays – Powder bays  Double wash down bay  Bulk property store  CAN cabinet storage  Chemical cabinet  Stringo storage area  Eye wash station and emergency deluge shower  Wash down sink  Secure vehicle storage pre-examination area – internal space  Secure vehicle examination area – internal space  Motorcycle examination area – internal space  Desk spaces

3.1.10 Road and Transport Policing Command (RTPC) – Requirements

MPS have provided a detailed brief for each of the 3 departments potentially being transferred to the Northolt site.

As part of this RIBA stage 1 design IBI have reviewed the requirements identified within the MPS brief for the RTPC department. Copies of the detailed MPS brief can be found in Appendix H.

As part of the engagement process the requirements for RTPC services has been reviewed at length. MPS have requested that the design allows for HGV access into the internal examination area which has been included in the Option 4 design, refer to the options accommodation schedules in Appendix I.

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Key accommodation, areas and vehicle types included within the RIBA stage 1 design options includes the following.

RTPC – High level / Serious Crime Forensic Services – Internal:

 Vehicle bays, wide access  Car – storage / waiting  Motorcycle – storage / waiting  Motorcycle lift  3.2 tonne 2 post lift  3 tonne 4 post lift  4 tonne 4 post lift  5 tonne 2 post lift  HGV lift store  Tool box stores  Brake test and headlamp beam test area  Workbenches  Air compressor and hairdryer space  Eye wash station and emergency deluge shower  Wash down sink

3.2 Department Adjacencies

At the initial engagement meetings IBI tabled adjacency diagrams at the engagement meeting on the 15th October to illustrate IBI’s understanding of each department’s requirements and adjacencies to each other, these formed the basis of the option designs and refinement of the schedules of accommodation.

Site Adjacency Diagram

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Reception Building Adjacency Diagram

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Shared Welfare Facilities Adjacency Diagram

VRES / Forensic / SCIU / RTPC Office Adjacency Diagram

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VRES - Internal Store Spaces Adjacency Diagram

Forensics - Internal Spaces Adjacency Diagram

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Road and Transport Policing Command (RTPC) - Internal Spaces Adjacency Diagram

3.3 Schedules of Accommodation

IBI as part of this RIBA stage 1 feasibility have undertaken a detailed review of the overall MPS brief. Based upon this information IBI have prepared schedules of accommodation for all the departments and support areas. Detailed accommodation schedules for each option can be found in Appendix I.

IBI tabled a draft overall schedule of accommodation based upon the brief at the initial start-up meeting. This schedule has been further refined at subsequent engagement meetings noted above and used to prepare the final RIBA stage 1 outline schedule of accommodation, below.

External Entrance Area Number Dimensions Area Required Comments Visitor Parking – Standard 6 2.45m x 5m 74 Visitor Parking – Disabled 2 4.85m x 7.2m 70 Visitor Entrance 1 TBC 100 Variable site dependent 244

Vehicle Entrance Number Dimensions Area Required Comments Vehicle Air Lock 3 7.3m x 26.0m 570 External space

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Reception Building Number Dimensions Area Required Comments Public / visitor entrance lobby / waiting 1 6.0m x 7.0m 42 Seating for 4 people Disabled WC 1 4.5 Enquiries hold / counter / Triage counter standard 1 2.0m x 4.0m 8 rear counter circulation Enquiries hold / counter / Triage counter DDA compliant 1 2.0m x 4.0m 8 rear counter circulation Public waiting 1 6.0m x 7.0m 42 Seating for 4 people Front counter standard 3 2.0m x 4.0m 24 Front counter DDA compliant 1 2.0m x 4.0m 8 For 5 desks, storage and Counter rear office area 1 8.04m2 pp 40.2 print area Specification to PACE VRES Interview Room 1 3.4m x 2.35m 8 requirements Net allowance 184.7 Factors Planning / Design Contingency 9.24 Sub-total 193.94 Engineering 5.82 Circulation 64.00 Total allowance 263.75

Welfare Facilities Number Dimensions Area Required Comments (Shared VRES – MSC – Forensics) Based upon 1/3 staff Rest room with beverage bay 45 TBC 45 numbers @ 1m2 each Staffing diversity 60% male to 40% female. Total briefed Male lockers 76 0.93m2 each 70.68 forensics 12, VRES 77 = Total 77 Male showers 3 3.5m2 each 10.5 1 per 30 Male WCs 10 3.5m2 each 35 WCs and urinals Staffing diversity 60% male to 40% female. Total briefed Female lockers 51 0.93m2 each 47.43 forensics 12, VRES 77 = Total 77 Female showers 3 3.5m2 each 10.5 1 per 30 Female WCs 6 3.5m2 each 21 WCs only First aid room 1 TBC 8 Disabled WC 1 TBC 4.5 Disabled locker, shower and WC 1 TBC 6 Net allowance 258.61 Factors Planning / Design Contingency 12.93 Sub-total 271.54 Engineering 8.15 Circulation 89.61 Total allowance 369.30

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VRES - External Spaces Number Dimensions Area Required Comments Assumed 2 no 12 vehicle Vehicle Drop Off area - Statutory / Uninsured 24 2.45m x 5m 294 transports - Van bays Requested at engagement Vehicle pick up area 0 n/a n/a meetings Assumed 2 no 12 vehicle Short Term Vehicle storage - Vehicle Check 24 2.45m x 5m 294 transports - Van bays Long Term Vehicle Storage - Non Road 30 2.45m x 5m 367.5 Car / Van bays worthy i.e. without wheels etc. Long Term Vehicle Storage - Road worthy 20 2.45m x 5m 245 Car / Van bays

Long Term Motorcycle Storage 15 1.25m x 2m 37.5

Parking for MPS vehicles 20 2.45m x 5m 245 Van Bays

Vehicle Drop Off area PACE 5 2.45m x 5m 61.25 Assumed Number

Cars - Road worthy 129 2.4m x 4.76m 1474 Overall storage 900 vehicles, 60% have no wheels / limited movement. Cars - Non Road worthy i.e. without wheels 192 2.4m x 4.76m 2193 5 no electric vehicle charge etc. points required Motorcycles - Road worthy 40 1.25m x 2m 100 Motorcycles - Non Road worthy i.e. without 60 1.25m x 2m 150 wheels etc. Vans - Road worthy 28 2.45m x 5m 343 Overall storage 900 vehicles, 60% have no wheels / limited movement. Vans - Non Road worthy i.e. without wheels 42 2.45m x 5m 514.5 5 no electric vehicle charge etc. points LWB Van - Road worthy 16 2.45m x 7.15m 280 LWB Van - Non Road worthy i.e. 24 2.45m x 7.15m 420 without wheels etc. Rigid Truck 10 3.15m x 9.25m 291

Artic Truck 10 3.15m x 17.2m 542

HGV Tractor units with trailers 6 3.15m x 17.2m 325 An area marked out painted Sightlines, Mirrors / CCTV / Satnav 1 20m L x 10m W 200 onto the ground in 1m test area squares 12 Cubic Metre. 4.3 L x Waste Skips 3 6.3 x 3.75 71 1.75m wide plus 1m circulation around Open _ assumed area TBC Secure store - External 1 TBC 90 - may be doubled up Pound Equipment store area - External 1 TBC 16 Assumed

Gas Bottle store 1 TBC 6 Assumed

Fuel Store (Diesel & Petrol) 1 TBC 10 Assumed

Net allowance 8569.75

Factors

Planning / Design Contingency 428.49

Sub-total 8998.24

Engineering n/a

Circulation 2969.42 Total allowance 11967.66

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VRES - Internal Spaces Number Dimensions Area Required Comments

Large Exhibits Store (Trees from 1 3x (12.2 x 2.45) 90 3no existing 40ft shipping accidents, Skips, contents of scrap yards) containers, 12.2m L x 2.45 W x 2.6 H

Secure store - Undercover 1 TBC 90 Undercover - Assumed areas TBC - may be doubled up

Pound Equipment store - under cover 1 114 Existing 12m x 10m , less ( secure store (6m2)

Pound Equipment Secure store - 1 3m x 2m 6 Assumed under cover ( )

Net allowance 300

Factors

Planning / Design Contingency 15.00

Sub-total 315.00

Engineering 9.45

Circulation 103.95

Total allowance 428.40

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Shared Offices VRES - MSC - Forensics Number Dimensions Area Required Comments VRES Admin Office 18P 1 Circa 8.04m2 per 145 Could be open plan shared person based upon 8.04m2 per person Forensic Services 8P office 1 Circa 8.04m2 per 64 Could be open plan shared person based upon 8.04m2 per person SCIU / RTPC 3P office 1 Circa 8.04m2 per 24 Could be open plan shared. person Extg 8.2 x 10.7 Meeting / Interview Room Required 1 TBC 11 Assumed 8 person Forensic Services Exhibit and Paperwork 1 TBC 20 Existing 5m x 4m, r Room Forensic Services Store Room 1 TBC 20 Existing 5m x 4m ideally double size required, Racking, locate local to work area Forensic Services Studio 1 TBC 27 Existing 6.5m x 4.2m can be upper floor VRES Interview Room 1 TBC 9 Specification to PACE requirements VRES Briefing / Training Room 1 6m x 12.5m 75 Store (Stationary) 1 TBC 8 Cleaners room 1 TBC 8 TER room 1 TBC 8 IT Room 1 2.4m x 2.6m 6.24 Business Support Offices(VRES) 2 5.2 x 5.0 26 Assumed Brief area Security Office 1 5.0 x 6.0 30 Potential Brief Change - Forensic Regulation office space would be required for 40 desks.

Net allowance 481.24

Factors

Planning / Design Contingency 24.06

Sub-total 505.30

Engineering 15.16

Circulation 166.75

Total allowance 687.21

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RTPC - High level / Serious Crime Forensic Number Dimensions Area Required Comments Services - Internal Vehicle bays, wide access 20 6.0m L x 4.0m W 480 Vehicles to avoid contact

Car - storage / waiting 8 6.0m L x 4.0m W 192 Vehicles to avoid contact. Motor cycle - storage / waiting 15 2.8m L x 1.5m W 63 Vehicles to avoid contact.

Motorcycle lift 1 5.6m L x 4m W 22 Angled bay preferred to allow access 3.2 tonne 2 post lift 1 8.7m L x 5m W 44 Angled bay preferred to allow access 3 tonne 4 post lift 1 8.7m L x 5m W 44 Angled bay preferred to allow access 4 tonne 4 post lift 1 8.7m L x 5m W 44 Angled bay preferred to allow access 5 tonne 2 post lift 1 9m L x 5.6m W x 51 Angled bay preferred to 6m H allow access HGV Lift store 1 4m L x 1.5m W x 6 3m H Tool box stores 4 2m L x 1m W x 2m 8 H Brake Test & Headlamp beam test area 1 14m L x 5.2m W 73

Workbenches 5 1.5m L x 1m W 7.5 Air Compressor & Hairdryer space 1 2.5m L x 1.2m W 3

Net allowance 1037.5

Factors

Planning / Design Contingency 51.88

Sub-total 1089.38

Engineering 32.68

Circulation 359.49

Total allowance 1481.55

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Forensic Services - Internal Number Dimensions Area Required Comments Enclosed CSI Bays - CNA (Cyanoacrylate 1 8.2m x 4.5m 36.9 Entrance shutter W x Vapour) H - Alternative Exit route required, van turning circle @ entrance Enclosed Forensic Services Bays - light bay 1 8.2m x 9m 73.8 Entrance shutter W x (with concertina access door) H - Alternative Exit route required, van turning circle @ entrance Enclosed Forensic Services Bays - Forensic 2 8.2m x 4.5m 73.8 Entrance shutter W x bays H - Alternative Exit route required, van turning circle @ entrance Enclosed Forensic Services Bays - Powder 2 8.2m x 4.5m 36.9 Entrance shutter W x bays H - Alternative Exit route required, van turning circle @ entrance Double wash down bay 1 8.2m x 9m 73.8 Open fronted - Alternative Exit route required Bulk Property Store 1 8m x 4.5m 36 CAN cabinet storage 1 TBC 2 Chemical Cabinet 1 TBC 2 Stringo storage area 1 TBC 2 Eye wash station 1 TBC 2 sink 1 TBC 2 Secure Vehicle Storage pre examination area 100 6m L x 4m W 1125 Vehicles to avoid contact. - Internal space Brief suggested area 45m x 25m, Current hangar has 3 shutters - entrance (5.5m x 6.1m), internal between storage and exam area (4.2m x 5.1m), exam exit (5m x 5m) Secure Vehicle Examination area - Internal 12 6m L x 4m W 375 Vehicles to avoid contact. space Brief suggested 25m x 15m Motorcycle Examination area - Internal space 50 4m L x 3.25m W 136.8 1 metre in between each space. Brief suggested area 14.4m x 9.5m, Desk spaces 7 Circa 5.5m2 per 35 person Net allowance 1671.8

Factors

Planning / Design Contingency 83.59

Sub-total 1755.39

Engineering 52.66

Circulation 579.28

Total allowance 2387.33

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3.4 MRD Northolt Site

3.4.1 Preferred Site

The outcome of the MPS MRD Northolt Massing Study dated May 2017 highlighted Northolt as being the preferred site to be redeveloped to provide a combined service offering for MPS Vehicle Recovery and Examination Services (VRES), Forensic Services and Road & Transport Policing Command (RTPC) services.

The existing site is used by MPS as a motor repair depot which is serviced by circa 27 staff across the fleet services.

The site is circa. 20,317m.sq, however we would recommend at the next design stage that a full topographical survey of the site is undertaken to establish exact boundary locations and levels.

The site is located on Rowdell Road, just to the south of Northolt tube station. The site is situated within a Strategic Industrial Location as designated by the Ealing Proposals Map (2013) and the London Plan (2016). The surrounding area is industrial in nature and comprises of a variety of warehouse buildings of differing scales.

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The site is serviced by a vehicular entrance off Rowdell Road.

The site is not located within a conservation area, though it borders the Canalside Conservation Area of the Grand Union Canal. It is not situated within the curtilage of or adjacent to a listed building. There are no other restrictions on the property.

The total gross external area of the site is 21,140sqm.

3.4.2 Site Access

The site is serviced by a vehicular entrance off Rowdell Road.

3.4.3 Traffic Assessment

This section has been produced to illustrate a number of risks with pedestrian and vehicular access and egress to the site.

The number of vehicles entering the site will significantly increase from the current number, as noted in section 2.5. The site requires access 24/7 365 days a year.

Main access to the site from the A40 is via Rowdell Road, this is a 2 way road that has narrow stretches of single lane passing due to parked cars (image 1).

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Image 1

There is currently unrestricted parking along Rowdell Road outside the site, this might affect turning circle for vehicles entering and exiting the site particularly if cars are parked opposite the access points (image 2 & 3).

Image 2

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Image 3

There are no traffic calming bumps along the route however Belvue Road has restricted one way access with a bus only route (image 4).

Image 4

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3.4.4 Public Transport

The site is within a PTAL of 2. Closest tube station is within a 10 minute walk from the site. A bus stop, route E10, is directly opposite the site. See maps below.

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Pavement widths are restricted due to cars parked on the pavements, as illustrated in image 5. There are no dropped kerbs, tactile paving or guard railing at crossing points. There are no off street cycle lanes in the vicinity of the site.

Image 5

With the above in mind we would advise at the next stage to carry out a full Transport Impact Analysis (TIA) involving modelling and traffic flow studies to ascertain the full impact.

3.4.5 Flood Risk

We have not undertaken detailed investigation into environmental matters, such as flooding. We have however undertaken desk top research into the flood risk of the site.

We should like to draw your attention to the fact that we have not sort advice from an environmental consultant. Our comments within this sections are based on information from the environment agency and are solely in review to the Northolt site.

We have set out within this section of the report extracts from the environment agency website for the following:

A. Risk of flooding from rivers B. Risk of flooding from surface water C. Risk of flooding from reservoirs

We have set out below the key findings in the following sub-sections.

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A. Flood Risk from Rivers

Northolt site has no risk of flooding from rivers.

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B. Flood Risk from Surface Water

Northolt site is in an area which has very low chance of flooding from surface water.

Very low means that each year, this areas has a chance of flooding of one in one thousand (0.1%).

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C. Flood Risk from Reservoirs

Northolt site has no risk of flooding from reservoirs.

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3.5 Options

IBI developed a number of options each of which have been developed and refined into 5 distinct options.

3.5.1 Option 1 - Overview

The option assumes that Forensics & RTPC (Hangers A & B) at Perivale are retained and that the new site boundary is provided with additional security around the retained site at Perivale and build new VRS facilities at MRD Northolt

Pro’s

• Limited new build • Existing specialist RTPC & Forensic equipment will not require relocation. • Shortest programme

Cons

• Dual sites • Transport of vehicles between sites required • Additional staffing required • Requires lease extension at Perivale vs MET ownership of MRD Northolt • Vehicle storage capacity at Perivale severely restricted Possible under capacity on the remaining site • Hanger B outside of available leasable site area.

Numbers

The full client brief is for a total of 900 vehicles, of which 650 car are for VRES use.

This option provides 538 vehicle spaces, refer to summary vehicle schedule in section 3.9

3.5.2 Option 2 – Overview

Option 2 is for the re-provision of the VRES services and hanger B storage on a like for like basis at the MRD Northolt site. The solution is based upon the demolition of the existing buildings on the site and the building of a two storey entry building to provide reception, offices for both VRES & Forensics teams and staff welfare facilities. In addition to storage facilities for VRES equipment and items recovered from vehicles. An internal storage areas have been included to replicate hanger B at Perivale. The design option includes initial internal spaces allowances for vehicle located within large bays. These areas would require additional engagement meetings with VRES and Forensics should this option be taken forward.

The majority of vehicles will be stored externally and only minimal internal vehicle storage has been included within this option. Ground level solution only.

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This option assumes that both Forensics & RTPC will be primarily based in at Perivale. Hanger B would not be available.

Pro’s

• Limited new build required • VRES and specialist RTPC & Forensic vehicle storage on one site (formerly Hanger B) • Specialist equipment will not require relocation ( ). • Mid-term programme

Cons

• Limited vehicle capacity • Insufficient internal storage accommodation for forensic vehicles (formerly Hanger B). • Forensic testing activities will be remote - retained at Perivale • Dual sites • Transport of vehicles between sites required • Additional staffing required • Requires lease extension at Perivale vs MET ownership of MRD Northolt

Numbers

The full client brief is for a total of 900 vehicles, of which 650 car are for VRES use.

This option provides 522 vehicle spaces, refer to summary vehicle schedule in section 3.9.

3.5.3 Option 3 – Overview

Option 3 is for the re-provision of the VRES services to meet the MPS brief Vehicle numbers and hanger B storage on a like for like basis at the MRD Northolt site. The solution is based upon the demolition of the existing buildings on the site and the building of a two storey entry building to provide reception, offices for both VRES & Forensics teams and staff welfare facilities. In addition to storage facilities for VRES equipment and items recovered from vehicles. An internal storage areas have been included to replicate hanger B at Perivale. The design option includes initial internal spaces allowances for vehicle located within large bays. These areas would require additional engagement meetings with VRES and Forensics should this option be taken forward.

This option includes for 2 upper decks for vehicle parking. The design allows for both ramp and vehicle lift access to / from the upper levels. The majority of vehicles will be stored under cover with additional external vehicle storage at ground level.

This option assumes that both Forensics & RTPC will be primarily based in at Perivale. Hanger B would not be available.

Pro’s

• Significant new build required • VRES and specialist RTPC & Forensic vehicle storage on one site (formerly • Specialist equipment will not require relocation ( ). • Over 900 vehicle accommodated • Mid/long term programme

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Cons

• Limited internal storage accommodation for forensic vehicles (formerly ). • Forensic testing activities will be remote being retained at Perivale requiring transport of vehicles between sites.

Numbers

The full client brief is for a total of 900 vehicles, of which 650 car are for VRES use.

This option provides 934 vehicle spaces, refer to summary vehicle schedule in section 3.9.

3.5.4 Option 4 – Overview

In addition to stand-a-lone storage facilities for VRES equipment and items recovered from vehicles.

Internal Forensic and RTPC investigation and dedicated internal storage areas have been included to replicate both at Perivale.

This option includes for 2 upper decks for vehicle storage / parking. The design allows for both ramp and vehicle lift access to / from the upper levels. The majority of vehicles will be stored under cover with additional external vehicle storage at ground level.

This option assumes total vacation of the Perivale site.

Pro’s

• All facilities are contained within the one site. • Co-location of services will allow for economies of scale, sharing of facilities etc. • Sufficient internal storage accommodation for forensic vehicles. • Brief Vehicle storage capacity met. • Vehicle bays within the multi storey area are splayed (45deg) as preferred.

Cons

• Longest Programme • Cost

Numbers

The full client brief is for a total of 900 vehicles, of which 650 car are for VRES use.

This option provides 986 vehicle spaces, refer to summary vehicle schedule in section 3.9.

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3.5.5 Option 5 – Overview

Option 5 is for the re-provision of RTPS / Forensics investigation areas and hanger B storage at the MRD Northolt site. The VRES provision will remain at the Perivale site.

The solution is based upon the demolition of the existing buildings on the Northolt site and the building of a single storey structure to provide reception, offices for Forensic team and staff welfare facilities. The structure provides two levels for vehicle storage/ parking with both ramp and vehicle lift access between levels. The top level of storage/ parking is at roof level and is not covered with additional external vehicle storage adjacent to the proposed development.

Internal Forensic and RTPC investigation and dedicated internal storage areas have been included to replicate both at Perivale.

Pro’s • Reduced new build required • RTPS, Forensics and Forensics vehicle storage on one site • Mid-Term programme • Cost

Cons • Dual sites • Requires lease extension at Perivale vs Met ownership of MRD Northolt • Limited under cover vehicle storage • Specialist equipment will require relocation ( ) • Additional staffing required

Numbers

The full client brief is for a total of 805 vehicles, of which 600 are for VRES, 43 for RTPC and 162 for Forensics

The option provides a total of 696 spaces, of which 506 are for VRES, 31 for RTPC and 159 for Forensics. Refer to summary vehicle schedule in section 3.6.

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3.6 Summary Schedule of Vehicle Capacities per Option

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3.7 Outline Specification

INTRODUCTION

This specification is intended to act as an RIBA Stage 1 outline specification for the project, which will be developed at the next design stage in NBS format.

The proposed construction, fabric and finishes for MRD Northolt are described generically. Where reference is made to specific manufacturers, suppliers or products, these are included in order to establish the nature and quality of a proposed product rather than to exclude the possibility of other manufacturers’ products being used.

Alternatives of equal performance and quality may be proposed at the next design stage.

This document is to be read in conjunction with all RIBA Stage 1 information, Architect’s drawings, Structural Engineers and Building Services Engineers information.

GENERAL COMPLIANCE NOTES

The works will comply with or exceed all applicable British Standards or British Standard Codes of Practice, product manufacturers guidelines, Building Regulations, Met Police Design Guides, Health and Safety at Work Act, CDM Regulations, all other statutory and local Jersey prevailing, Borough of Ealing local planning authority requirements, electricity at work and IEE regulations.

A separate report will be required to demonstrate compliance in relation to Building Regulations Approved Document Part L2A, 2013, requirements for Part L London Plan and Borough of Ealing, with a completed SBEM model or similar approved working model. The juxtaposition or combination of any materials, components or equipment, as necessary to form the proposed intent of the building will be considered and provision made to avoid any deleterious effect of such juxtaposition or combination.

Any future appointed contractor must undertake the works specified in accordance with the standard quality levels defined within the national building specification. Where this is not explicit then British standards apply, followed by best practice.

PROHIBITED MATERIALS

Notwithstanding the requirements set out in the following specifications, no products nor materials shall be used that are referred to as being hazardous to health and/or safety in “The Control of Substances Hazardous to Health Regulations” 2002 as amended or that do not comply with:

(a) The Montreal Protocol; (b) British Standards, BBA Certification or equivalent European industry standards as amended; (c) British Standard Codes of Practice; or (d) Which are generally known within the European Union at the time of specification to be deleterious to health and/or safety or to the durability of other structures, finishes, plant and/or machinery.

And the following shall not be included:

(e) Asbestos or any products or materials containing asbestos;

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(f) Substances that deplete the ozone layer as identified by the United Nations Development Programme; (g) Any material which incorporate tropical hardwood; or (h) Any wood that is not sourced from a forest accredited by the Forest Stewardship Commission

THERMAL INSULATION

The proposed MRD Northolt Vehicle Compound should achieve a BREEAM Very Good rating.

Products and materials chosen for construction are to be assessed with reference to the BRE Green Guide to Specification. Where possible building materials should be A-rated or better.

A BREEAM rating typically requires a 25% improvement on the U-Values indicated in Table 5 of Approved Document L2 – 2013 for a ‘Notional Building’. Therefore, the building fabric performances outlined below should be achieved as minimum standards:

Element U-Value (W/m2K) Comments External Walls 0.20 Roof 0.15 Ground Floor 0.18 Personnel Doors 1.8 Windows / Solar Glazing 1.6 G=0.399; LT=71%

G-Value = solar energy Transmittance, LT = Light Transmittance

AIR TIGHTNESS

The building is required to achieve an air tightness result of 7 m3hr/m2 @ 50Pa. LOW CARBON TECHNOLOGY

The scheme will be designed to include 350m2 of Roof mounted PV Panels, orientation to face south at 30 deg. Mounting angle.

DDA OVERVIEW

The scheme will be designed to comply with Approved Document M, the DDA regulations, BS8300 and SENDA 2001, and any relevant legislation at the time of construction.

Foundations

Reinforced concrete pile caps on concrete piles with perimeter strip foundations / ground beams.

For a detailed description of the substructure and superstructure, refer to the structural engineer’s design and specification.

Ground Bearing Slab Cast in-situ reinforced concrete ground floor slab with perimeter slab thickenings to the Structural Engineers design and specification. Power float finish. Slab joints are to be design to create a smooth run over for forklift vehicles.

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The perimeter/area calculation is to be carried out at the next stage to establish if perimeter/ below slab insulation is required for this building in order to achieve the necessary U-Value. However at this stage it is assumed 30mm of insulation (Kingspan Kooltherm K103 has been assumed) to achieve a U Value of 0.165W/m².

Proprietary damp proof membrane below slab to PIFA Standard 6/83A and EN 13967. Visqueen 1200 gauge DPM has been assumed. All abutment/penetration details: columns; pipe; services entry; slab thickening; slab perimeter; lift pit walls/slab, etc to be in accordance with the manufacturers standard details.

50mm Sand blinding.

Hardcore to Structural Engineers specification.

Building Frame

Structural steel frame with cellform and lattice beams at floor levels and universal columns in accordance with the Structural Engineers design and specification.

All steel structural frames, beams, columns, load bearing elements and floor structures must achieve 60 minutes fire resistance. Steel work is to be generally treated with intumescent paint to achieve the 60 minute resistance.

Fire test data to BS 476-20 and 21 must relate to the complete multi-layer intumescent coating system including;

• Surface preparation • Steel primer • Intumescent coating • Top sealer to protect intumescent coating

Any steelwork solely supporting the roof does not require treatment however any structure supporting roof top plant, PV’s or escape route shall be provided with the appropriate protection.

Upper Floors Slabs The upper floor structure to both the internal spaces and semi exposed deck parking area are proposed to be formed using cast in situ reinforced concrete and metal deck composite floor slabs with a power-floated finish to the Structural Engineers design and specification..

Roof

Roof Type 1 External Accommodation Area Pitched roof The roof to heated accommodation is proposed as a lightweight steel frame structure, metal purlins laid to falls, with composite Kingspan KS100RW trapezoidal, 150mm thick, 1.2mm steel faced cladding panels. (Insulation thickness to ensure compliance with Building Regulation Part L2 2012 as noted above). Fascia’s, Gutters, pressings and trims to be finished in polyester powder coated aluminium trims and pressings.

Roof Type 2 Second Floor Parking Area Canopy Pitched roof The second floor parking area canopy roof is proposed as a lightweight steel frame structure, metal purlins laid to falls, with Kingspan roll formed 1.2mm steel faced roofing panels. Fascia’s, Gutters, pressings and trims to be finished in polyester powder coated aluminium trims and pressings.

Generally Parapet copings and cladding accessories generally where required, will be polyester powder coated aluminium, colour TBC.

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Upstands and kerbs for service penetrations and parapets to be formed from Structural Framing System – Metsec or similar

Stairs / Guarding’s

Design loadings for stairs, ladders and walkways, and for horizontal loads on handrails, balustrades etc. are given in Eurocode BS EN 1991-1- and the National Annex to BS EN 1991-1-1.

Stairs and handrails to be designed in accordance with BS 5395-1 and BS 8300.

Stairs also to be in accordance with the guidance given in Approved Documents B, K and M.

Pre-cast concrete or cast in-situ concrete staircases, with exposed / plaster painted soffits.

Internal Office area staircase balustrades to be glazed system with 50mm dia stainless steel handrail. Generally 1100mm high to landings and 900mm from the line of the pitch. Handrails are to extend beyond the top and bottom steps by 300mm. Stair design is to comply fully with Approved Documents K and M and the relevant British Standards.

External Fire Escape / parking deck staircase balustrades to be nom 40mm dia metal, galvanised with intermediate rails and posts. Generally 1100mm high to landings and 900mm from the line of the pitch. Handrails are to extend beyond the top and bottom steps by 300mm. Stair design is to comply fully with Approved Documents K and M and the relevant British Standards.

Car parking deck guarding to comprise continuous Armco vehicle crash barrier / impact protection to all parking deck perimeters and vehicle access ramps. Min 1.1m solid upstand outer leaf and mesh / louvre vents form 1.1m up to underside of perimeter structure.

Building Envelope Curtain walling, windows and cladding systems to comply with the CWCT standards ‘Standard for Systemised Building Envelopes’ sections; • Part 1 Scope, terminology, testing and classification. • Part 2 Loads, fixing and movement. • Part 3 Air, water and wind resistance. • Part 4 Operable components, additional elements and means of access. • Part 5 Thermal, moisture and acoustic performance. • Part 6 Fire performance. • Part 7 Robustness, durability, tolerances and workmanship. • Part 8 Testing • Part 0 Specifiers’ checklist and certification. • Standard test method for building envelopes

Refer to the ‘Met Police Security Outline design requirement’ Refer Appendix XX, document for further information relating to the security management strategy adopted by the Client.

External walls

Below DPC Clay facing brickwork to BS EN 998-2 with a mortar group in accordance with PD 6697. Brickwork to have a durability designation of FL in accordance with BS 3921, freeze/thaw designation of F2 to BS EN 771-1 and active soluble salts content designation of S2 to BS EN 771-1. Clay facing brickwork to be laid to half stretcher bond with a bucket handle pointing. Manufacturer and type to be agreed/approved and included in a sample panel for inspection and approval by the Local Planning Authority.

Cladding

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Horizontal spanning composite cladding panel (Kingspan RW1000 or similar approved) to achieve U Value of 0.195W/m²K.

Supported by Cold rolled cladding Rails to Structural Engineers details and specification. 205mm purlins have been assumed to main cladding with narrower purlins behind the cladding to the window recesses in the current Architectural design. Supported by primary/secondary steel frame to Structural Engineers details and specification.

Note: For RIBA stage 1 of the design it has been assumed that the composite cladding system will provide the air tight seal line.

Cladding panel samples to be provided to the client for approval. Samples to include a section of a polyester powder coated aluminum drip flashing. All colors and finishes to be agreed.

Louvres within Cladding Polyester powder coated continuous extruded aluminum louvres. Louvre natural privacy vents are to be located to all open side of the car parking decks and located in external cladding. • Louvres to be aluminium box framing, pre-assembled with extruded louvre blades clipped onto box framing. Blades to be set at 45deg pitch and to be finished in polyester powder coating to BS 6496, colour TBC. • Louvres to provide natural ventilation to have hit/miss control.

Secure line walls The secure line typically follows the external perimeter of the primary buildings within a police site (e.g. the main complex not the perimeter wall). Publicly accessible areas, waste management, parking and bulky evidence storage are not included within the secure line.

The image below illustrates the definition of a secure line within a typical MPS police site and the measures required to create the secure line. The broader principles apply equally to patrol bases, custody centres and hub sites, etc.

Masonry Secure line wall – Rodwell Road Elevation The external wall to the Rodwell Road boundary is to have an outer leaf of composite cladding as noted elsewhere and an inner leaf of 225mm medium density 10.4 N/mm3 blockwoprk, laid flat with bed joint reinforcement. Wall ifs to be 2.4m high up to underside of steel cross rails withinthe building structural frame.

The External face of public accessible elevations are to be provided with Armco vehicle impact barriers

Internal Lining to External Walls

All dry lining wall systems to be in accordance with the manufacturers written instructions, BS 8212, Part B Walls and Ceilings and the ‘Site guide for dry linings’ published by the FIS.

Internally the external walls and adjacent columns are to be lined with a dry wall Independent Wall Lining (IWL) finished with two layers of board finish to provide 60 minutes’ fire resistance to the structural frame. Wall lining system to achieve ‘severe duty’ rating at all vertical spans to the underside of structural steel. (2 layers of 12.5mm Duraline board fixed to 70 I 70 ‘I’ Studs at 600mm centres have been assumed)

Complete external wall build-up to achieve a minimum U value of 0.195W/m²K.

Windows

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Windows to comply with BS EN 14351-1, BS 6375-1, BS 6375-2 and be tested in accordance with BS EN 1026, BS EN 1027 and BS EN 12211.

The window systems manufacturer must hold British Standard Kitemark licences for BS4873 “Specification for Aluminium Alloy Windows” and PAS 24-1:2016 “Enhanced Security performance requirements for doorsets and windows in the UK”.

Openable windows/casements should have an endurance performance Class 3 (heavy duty) in accordance with BS EN 12400.

Double/triple glazed unit polyester powder coated aluminium framed and capped thermally broken. All double/triple glazed units to be hermetically sealed and toughened or laminated where required in area of safety. Glass to have low emissivity coating to inner pane, to meet design criteria.

• Adjustable keep for trickle ventilation. • Ironmongery to window elements is to be as recommended by manufacturer. • Powder-coated aluminium flashings, colour RAL 7016 and perimeter details to co-ordinate and form a weathertight installation. • Co-ordination will be required between the window and adjacent contractors to agree the detail and sequence for all sill details and care must be taken to ensure: • Maintenance of insulation at perimeter abutments with adjacent installation • Insulated closer pieces glazed into window system and sealed to create a weathertight installation and maintain the thermal integrity. • Jambs, sills and heads to have EPDM lapped and sealed to the adjacent Vapour Control Layer of other external wall elements to create an air and weather seal. • Internal sills will be painted MDF. • Lockable restrictors to opening panes in accordance with Approved Document Part K

Window system to achieve an average U value of 1.6 W/m²K.

Glazing

Specific glass build-ups to be in accordance with BS EN 410 (light transmittance, radiant transmittance of glazing) in respect of solar and visible light performance.

• Solar-control coating to be provided where required to limit thermal gain • Windows and glazing generally to achieve sound reduction performance and thermal rating in accordance with Acoustic and Engineering specification requirements • Glazing to critical locations in accordance with the guidance given in Approved Document K and to be in accordance with BS EN 12600. • All large areas of glass, which may not be clear, must be provided with manifestation, in accordance with Approved Document Part K. • All external panes shall be toughened and internal panes shall be laminated in accordance with Approved Document Part K • Glazing performance values used for thermal modelling purposes are as follows;

- G Factor of 0.399 - Light Transmittance value of 71%

Further analysis as the design is developed further may be required

Internal and external glazing to Public accessible reception counters and gate office is to meet ballistic rating of BR4 EN1063.The design of the glazing and framing shall prevent liquids and other objects being projected through gaps in the glazing or framing and shall be securely sealed in its framing system.

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External Doors

Generally, external doors to be constructed from thermally broken powder coated steel sections. Frame sections to be suitable for double/triple glazing units.

Sizes and configuration to correspond to the elevation drawings. External access doors to be manual with automatic override for disabled users.

Door controls to provide for security locking with provision for .

• Frames to be finished in polyester powder coating, colour TBC with door leaf a lighter grey (colour TBC) • Doors to be fitted with lock mechanism and integral threshold check and sill. • Installation and fixing of door sets to maintain and complete air seal as required to achieve air test criteria for the external envelope • Level thresholds to all external doors • Allowance should be made for specialist interfaces with accessibility controls • All areas of glazing below 1500mm to be toughened safety glass to prevent vandalism • Manifestation to be as per requirements of Building Regulations • All doors to be glazed to the recommendations of BS952 and BSCP6262 in laminated or toughened safety glass • External landings to all external doors to be level - extending to the internal floor level, size to accommodate swing of door and suitably ramped. • Allowances should be made to provide door protection externally • Where required, integrated louvres for ventilation to provide free area requirement

External door system to achieve an average U value of 1.8W/m²K.

External doors to be designed to conform to PAS 24 and strength class to BS EN 1192. Refer to ‘Met Police Security Outline Design Requirement – MRD Northolt’

Door operation strategy to be developed at detailed design stage to consider hold opens, automatic opening, security and access control.

Vehicle Entry / Building Exits Interlocked access controlled steel roller shutter doors of solid lath construction with polyester powder coated metal frames. The supply and installation of roller shutters are to be tested and accredited to the following specification: LPS1175SR2

Main Entrance Lobby

Automatic sliding glazed doors with polyester powder coated metal frames. To SBD - PAS 24 rating. To be remotely controlled from the Gate office. All large areas of glass, which may not be clear, must be provided with manifestation, in accordance with Approved Document K.

Internal partitions

Internal walls are generally nonloadbearing, to provide future flexibility, plasterboard-lined metal stud partitions with skim coat finish and painted, to meet the appropriate fire and/or acoustic requirements.

Typically 70mm Acoustic C-section metal studs @ 600 mm center’s with 50mm insulation with 1no 15mm dense acoustic plasterboard to each side, although actual specification varies to suit fire and/or acoustic requirements.

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Partition heads to accommodate deflections as confirmed by the structural engineer including a 70x50 SW packer throughout. Where the head of the partition is exposed this is to be formed with a recessed mastic seal and without surface mounted angles etc.

Moisture resistant plasterboard is to be used to wet areas (toilets and cleaners room etc). White glazed wall tile splashbacks will be provided for sinks and washbasins.

Precise partitioning construction to be selected at the next stage.

Partitioning to incorporate all necessary secondary supports/noggins to facilitate installation of doors, pre-plumbed sanitary back panel assemblies and M & E services and to provide support for fixtures and fittings.

Internal masonry walls Blockwork partitions are to be provided around secure lines, stair cores, MEP services rooms at ground floor and service risers: using 140 mm thick 7 N/mm2 concrete common blockwork to BS 6073.

Blockwork to lift shafts: 210 mm thick collar jointed blockwork comprising 2 skins 100 mm thick 7 N/mm2 blockwork to BS 6073.

Blockwork visible in occupied spaces are to be fair faced finish.

Internal doors

Generally Doors to be in accordance with Approved Document B2, BS 9999, BS 476. Door sets to have a strength class of 4 to BS EN 1192. Vision panels to be clear glass suitable to achieve the fire and acoustic performance requirements of the door.

Door set/glazed screen manufacturer to provide all test data required to verify door set and glazed screen performance.

Glazing to critical locations, i.e. up to 1500mm in doors and within 300mm of doors and up to 800mm AFFL in all other location, to be safety glass in accordance with the guidance given in Approved Document K and to be in accordance with BS EN 12600.

Single leaf doors and primary leaf of a double door sets to have a minimum effective clear opening of 800mm (or 825mm depending on the direction of approach, see table 2 of Approved Document B2. Refer to BS 8300 for means of measuring the effective clear width.

Internal doors to be positioned so that the leading edge is no less than 300mm from a wall on the pull side of the door.

All internal doorsets to achieve a minimum acoustic rating of 30dB Rw. Performance criteria/requirements should be confirmed by an Acoustician.

Door operation strategy to be developed at detailed design stage to consider hold opens, automatic opening, security and access control.

General Office accommodation (offices, meeting rooms, circulation, WC’s, Stores etc) Solid timber core doorsets with high pressure laminate finish door panels, hardwood lipping’s and hardwood beads. Laminate type to be agreed. Frames and architraves to be hardwood, species to be agreed. Vision panels as required. Stainless steel impact protection to be added where required in areas with high trolley traffic.

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Offices with Glazed partition systems Frameless glass door in a proprietary glass wall system. Polyester powder coated metal sill, head and jamb frame to glazed screen with silicone joints to glass panel abutments. All large areas of glass, which may not be clear, must be provided with manifestation, in accordance with Approved Document K.

In order to ensure the quality of installation work undertaken and performance of the door-sets once installed, ensure those installing the door-sets are approved under recognised third party installer schemes such as those operated for fire door-sets by BM Trada, FIRAS and LPCB. All door-sets are to be suitable for their location in terms of fire rating and acoustic performance.

Internal Wall Finishes

Surface linings of walls to meet Class 3 for small room <30m², Class 1 for all other rooms and Class 0 to circulation spaces to BS 476-7.

Paint systems/finishes to be in accordance with BS 6150.

Surfaces to be prepared, primed and finished in accordance with the manufacturers written instructions.

General Office Accommodation and circulation Emulsion Paint finish.

General Forensic Laboratory Areas Full height hygienic wall cladding (Altro Whiterock or similar approved).

High Traffic Forensic Laboratory Areas PVCu wall protection to a height of 1200mm (Altro Fortis or similar approved) with Hygienic wall cladding to remainder (Altro Whiterock or similar approved). Proprietary bump rails (two levels) and wall corner protectors required to these areas.

Storage Areas PVCu wall protection to a height of 1200mm (Altro Fortis or similar approved) with Hygienic wall paint to remainder. Proprietary bump rails (two levels) and wall corner protectors required to these areas.

WC’s and Shower Rooms Full height hygienic wall cladding (Altro Whiterock or similar approved).

Canteen and break area PVCu wall protection to a height of 1200mm (Altro Fortis or similar approved) with Hygienic wall paint to remainder.

Main Entrance Reception Emulsion wall paint, colour choices and signage tbc.

External Covered / Internal Vehicle Storage Deck Areas Resin Flooring to concrete floor slabs to be 4mm thick Triflex DFS-External by Triflex UK LTD, Whitebridge Way, Stone, Staffordshire, ST15 8JS. Tel: 01785 819119. or equally approved fully elastomeric crack-bridging, waterproofing membrane with wearing layer system. Sealant movement joints and up stands. Application around steel columns, supporting structures and floor gulley’s. Over banding to any PC plank edges / ends must be fully and diligently adhered to in order to prevent dynamic cracks compromising the system.

Internal Floor finishes

Resilient and textile floor coverings to comply with BS 8203 and BS 5325 respectively. Surfaces to be prepared, treated and finished in accordance with the manufacturers written instructions.

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Carpet Tiles • Seems to have ‘pattern’ matching and laid tight together, without gaps • Laid on in-situ concrete screed with a smooth, even and dust free with a relative humidity level of max. 75%, tested with a hygrometer to BS 5325, Annexe A or BS 8203, Annexe A. Or on a raised access floor system to PSA standards. • Allow for primer/adhesive to manufacturers specification

Vinyl • Gradus PVC transition strips, threshold strips, stairs trims / nosings, etc. Stair nosing to provide colour contrast in accordance with BS 8300. • Seems to have ‘pattern’ matching and laid tight together, without gaps. • Vinyl floors to have coved skirtings with proprietary cove formers and capping trims. • Laid on in-situ concrete screed with a smooth, even and dust free with a relative humidity level of max. 75%, tested with a hygrometer to BS 5325, Annexe A or BS 8203, Annexe A • Allow for primer/adhesive to manufacturers specification.

Main Entrance Lobby Barrier matting to be provided to Main Entrance Lobby.

Main Entrance Reception Large format slip resistant floor tiles (R12 minimum).

General Office Accommodation. Carpet tiles, Painted MDF skirtings.

Shower Rooms Vinyl slip resistant safety flooring with 150mm high coved skirting (Altro Pisces or similar approved).

Main Kitchen Vinyl slip resistant safety flooring with 150mm high coved skirting (Altro Stronghold 30 or similar approved). Canteen and Break Area Vinyl safety flooring with 150mm high coved skirting (Altro Timber Safe or similar approved).

Ceiling finishes

Ceilings to meet Class 3 for small room <30m², Class 1 for all other rooms and Class 0 to circulation spaces to BS 476-7.

Plasterboard ceilings to be painted with Dulux diamond matt paint.

Surfaces to be prepared, primed and finished in accordance with the manufacturers written instructions.

Paint systems/finishes to be in accordance with BS 6150.

Ceilings will typically comprise, suspended lay-in tile grid system with feature plasterboard bulkheads.

Suspended ceiling heights generally as follows; - Perimeter rooms with natural light & large internal rooms: min 2700 mm affl - Internal rooms: min 2400 mm affl

Proprietary access panel systems to be provided in all critical locations where demountable ceiling tiles are not provided.

Suspended ceilings to be manufactured in accordance with the harmonized standard BS EN 13964, DIN EN

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Ceilings to meet Class 3 spread of flame for small room <30m², Class 1 spread of flame for all other rooms and Class 0 to circulation spaces to BS 476-7. Refer to Atkins drawings YBC-ATK-Z1-00-DR-A-0420 (CMT Department), YBC-ATK-Z1-00-DR-A-0421 (Hospital Services Department), YBC-ATK-Z1-00-DR-A-0422 (RCI Department) and YBC-ATK-Z1-00- DR-A-0423 (H&I Department) for information on finishes to these Departments. General ceiling heights to be 3000mm with a minimum of 2700mm to be achieved. Ceiling types are outlined as follows and should be developed in more detail depending of specific room requirements, especially with regards to acoustic performance.

General Office Spaces and Meeting Rooms. Class A mineral wool ceiling tile with a standard lay-in-grid suspension system.

General Circulation spaces Class C mineral wool ceiling tile with a standard lay-in-grid suspension system.

General Storage Areas Vinyl faced plasterboard ceiling tile with a standard lay-in-grid suspension system.

Forensic Laboratory Areas Class A Hygienic ceiling tile, suitable for Laboratory areas, with a clean room suspension system (Eurocoustic CLINI’SAFE or similar approved).

Shower Rooms and WC’s Moisture resistant lay in grid ceiling tile, with a corrosive resistant suspension system.

Food prep areas (KItchen and Break Area) Class A Hygienic lay-in-grid ceiling tile with a corrosive resistant suspension system (Armstrong Parafon Hygiene or similar approved).

Main Entrance Reception Class A perforated metal pan lay-in-grid tiles with a standard suspension system with a painted plasterboard perimeter to avoid using cut tiles.

Plant rooms and proposed store areas will have exposed structural soffits and services.

Fittings & Furnishings

Gate office Desk Purpose-made desks formed of solid grade laminate. Allowance to be made for a quantity of power and data points within the desk.

Blinds Roller blinds to be provided to all first and second floor office spaces to provide privacy or control against glare.

All chains/control mechanisms for window blinds are to be fixed to the adjacent wall to prevent misuse.

Sanitary Appliances

IPS and Cubicles • Cubicles, IPS, and wash trough arrangements/layouts to be in accordance with BS6465. • High quality, robust fittings and cubicles, concealed cisterns and plumbing are required. • Full height solid grade laminate-faced IPS with lockable access panels and tamper proof fittings. • Solid aluminium ironmongery and locks with emergency release • Disabled/ambulant grab rails to be metal finish, mechanically fixed to walls • All ironmongery shall be suitable for use by persons with limited dexterity • All cubicles will be provided with anti-vandal pattern hinges, indicator bolts and buffered coat hook

WC • Vitreous china back-to-wall WC pans

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• Concealed low-flush cistern • Toilet paper dispensers, sheet type with lock to prevent interference • Sanitary product disposal bins should be provided in each female cubicle

Basins and Sinks • Generally solid surface wash-basins or wash trough with concealed plumbing and captive wastes. Individual hand wash basins to be porcelain and wall mounted. Robust and tamper proof spray mixer low-water-use taps. Where practicable, taps should be wall mounted, sensor operated and turn off automatically. WRAS certified taps

• All mirrors to be proprietary laminated toughened safety glass • Soap dispensers, cartridge type, sensor operated with concealed fittings to avoid interference • Electric hand dyers to be provided, dryers to be high efficiency, high velocity air sheet hand dryer type. • Cleaners Cupboards – to be provided with integrated stainless steel whb/bucket sink janitorial unit.

Showers • Doc M shower pack inclusive of grab rails (hinged and fixed), seat, adjustable shower head, controls, curtain rail, etc. Fitting to be temperature controlled

Accessible WC • Document M accessible WC pack

All Fittings to be White ceramic.

Internal Passenger Lift 1no. Part-M / DDA compliant fully enclosed ‘in shaft’ 13 person passenger lift will be Provided.

3.8 BIM

This section of the RIBA Stage 1 feasibility establishes outline for the digital information requirements of the MRD Northolt Project. The MPS requirement is for level-2 BIM reflecting the scope and details as outlined by a number of standards and protocols. At the next stage of the project development an Employer’s Information Requirement (EIR) is to be prepared to encourage the adoption of common standards and supports effective collaboration.

The EIR document should be considered as part of the wider design documentation for the Client, Design Team and subsequent Contractor.

The EIR sets out clearly what models are required and what the purposes of the model will be. These requirements will be written into the BIM protocol. The design team at the outset of the next stage (RIBA stage 2) shall outline within the BIM Execution Plan (BEP) how digital data will be delivered and managed throughout the project. This will also include:

• The Project Implementation Plan; • Project goals for collaboration and information modelling; • Major project milestones consistent with the project programme; and • Project Information Model deliverable strategy

All parties involved in the use, production or delivery of Models on the Project are required to have a BIM Protocol appended to their contracts. In addition to providing technical detail and specifying standards, the BEP document also serves to present high level explanation for the benefit of States of Jersey staff who will be engaging with the BIM process and newly adopted BIM data standards.

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The standards outlined are not only for the benefit of construction but consider how data will be transferred, maintained and managed by the client post-handover. Standards are adopted to provide transition into the operational domain and to facilitate future integration and technology and above all assist the MPS staff in achieving further efficiencies whilst maintaining an effective and economic Property Estate.

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4.0 Mechanical, Electrical and Public Health Services

4.1 Introduction

4.1.1 Purpose of this Report

This report covers the RIBA Stage 1/ Feasibility MEP proposals for MRD Northolt – the proposed replacement of the existing Perivale Car Pound including the re-provision of the currently accommodated police investigation services within Perivale.

This report focuses on the proposed new build development option 4 comprising of the redevelopment of the existing Northolt site including demolitions and the provision of vehicle recovery, parking, storage and investigation accommodation plus a personnel service accommodation block.

To develop the proposals within this report a number of design team and client meetings have been attended to develop a robust brief, and the RIBA Stage 1 proposals.

The main output of this report is the statement of a Project Brief for the project in order to fully define the requirements of the MEP package and to provide an opportunity for the sign off of the MEP brief by the Client.

4.1.2 Basis of Design

The M, E and PH services shall be designed in accordance with the regulations, standards, guidance notes and publications as detailed below.

 Building Regulations Approved Document L2A 2010 edition - Conservation of Fuel and Power  CIBSE Guide A, B and C  CIBSE Guide F - Energy Efficiency in Buildings  CIBSE Guide G - Public Health Engineering  CIBSE Guide H - Building Control Systems  CIBSE Guide L – Sustainability  Building Regulations 2nd tier document – Non-Domestic Heating, Cooling and ventilation compliance guide  Building Regulations Approved Document F means of ventilation  CIBSE lighting guide 3 (LG3): The visual environment for display screen use  CIBSE lighting guide 10 (LG10) Daylight and windows  18th Edition of the IET wiring regulations (BS 7671)  Health and Safety legislation  The Institute of Plumbing - Plumbing Engineering Services Design Guide  CIBSE Guide G - Public Health Engineering  Health and Safety legislation  BSEN 12056-1 Gravity drainage systems inside buildings. General and performance requirements  BS EN 12056-2 Sanitary pipe work, layout and calculation  BSEN 12056-3 Gravity drainage systems inside buildings. Roof drainage, layout and calculation for the design of drainage of roofs and paved areas  Building Regulations Document H  Water Byelaws 2000 and local water authority requirements  B.S.E.N. 806 Specifications for installations inside buildings conveying water for human consumption.

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 Water Research Centre - The water fittings and materials directory  HSE Booklet HS(G)70 - The control of Legionellosis including Legionnaire’s Disease  HSE Document L8 - The control of Legionella Bacteria in Water Systems  Local Authority Requirements  Met Police on line design guide

4.2 Project Overview

4.2.1 Project Description

The project forms part of the proposed development and upgrade of the 2No vehicle pound sites that services east and west London. The existing site at Perivale in West London comprise building on a leased site. The proposed Northolt site provides the opportunity to develop specific Met Police requirements mirroring aspects of the Perivale and Greenwich sites and developing a brief for the site that reflects the current and anticipated requirements of the Met Police divisions (Forensic and RTPC). The requirements of VRES as provided for in the earlier studies are no longer required as part of Option 5.

The building proposals (indicated by IBI option 5) comprise of a single storey building housing office/staff facilities and vehicle examination/inspection areas, with further external vehicle storage at roof level and adjacent to the proposed development.

4.3 Plant Strategy

The office and local areas of the storage and inspection internal areas will comprise of occupied spaces so will require heating with cooling to the office building and ducted ventilation to the office areas. Industrial extract and fresh air supply systems will be required to the garage and inspection areas with heating provided where necessary.

Dedicated ground floor plant space will be required for the following systems;  Water storage and booster pumps  Electrical main switchgear  Domestic water equipment  Air handling equipment  LTHW and chilled water plant

Roof (or external) plant space will be required for the following systems;  Air Source Heat Pump  External Condensing units (Split DX systems)  Photovoltaic array  Standby diesel generator

4.3.1 Project Equipment Resilience

It is understood the building will not require a level of resilience above what is considered normal good practice for this status of the building. The Met police have confirmed the requirement for a standby generator which shall provide electrical back up should the mains grid power supply fail. The generator shall be configured to provide 8 hour run on 100% of the building load excluding the normal building cooling requirements (IT cooling requirements shall be maintained)

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It is proposed that the following will be provided: Plant Redundancy Example Arrangement Ventilation AHU’s 0% redundancy, AHU @ 100% with plug fans for quick and easy replacement.

ASHP Heating/Cooling 60% redundancy 2No No 125kW(th) ASHP with Plant simultaneous heating and cooling capacity. Minimum of 2 compressors to maintain operation during maintenance or failure. Pumps 100% redundancy 2 No. @ 100% duty/standby per system

4.3.2 Plant Access

Plant and equipment will be arranged so that components can be installed, accessed, cleaned, maintained, removed and replaced without unreasonable difficulty and without compromising the health and safety of personnel.

The design and installation will, as a minimum, satisfy the following:

Plant and equipment manufacturers' recommendations. BS 8313 Accommodation of Building Services in Ducts. BSRIA Application Guide AG 11/92: Design for maintainability. BSRIA Technical Note TN 10/92: Space allowances for building services distribution systems - detail design stage. CIBSE Guide M Maintenance Engineering and Management. Other appropriate British Standards.

Further details of proposals will be submitted during design development stage where special measures are required to achieve a safe and `serviceable installation.

All main items of plant will be accessible from permanent access walkways or where access is not possible from the permanent structure, purpose made access platforms will be provided. Fixed access ladders, gantries, platforms and handrails will be provided as necessary. Items of plant and equipment will be arranged so that they can be removed without dismantling any permanent elements of structure or building fabric and without compromising normal access or escape routes.

Lifting beams shall be provided for all major items of plant, where required.

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4.3.3 Major Plant Replacement Overview

Generally, the main plant is to be located within the roof plant enclosure and ground floor plantroom. Below is an outline to consider initial installation and replacement strategy per major plant item and location;

Plant Item Plant Location Initial Installation Plant Replacement Air Handling Units Ground Floor plant area Installed in sections All components within the AHU can be replaced. If the frame requires replacement it will need to be broken down and a modular frame AHU installed in situ. ASHPs Roof Vehicle access to roof Vehicle access to roof

Split DX Condensers Roof Vehicle access to roof Vehicle access to roof

Cold water storage & Ground Floor plant area Modular tank panels As per installation Booster pumps installed in sections

Buffer Vessels Pumps/vessels manoeuvred via pallet trolleys etc

Electrical Switch Gear Ground Floor switch Delivered and installed Sectional removal via room during MEP fit out. ground floor doors

4.3.4 Asset Performance

Plant, systems and system components will be selected to meet the minimum energy efficiency standards identified in the Non – domestic Building Services Compliance Guide and to align with the Part L requirements and energy targets of the project.

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The HVAC and PH systems will have the following indicative life expectancies:

Plant or System Item Indicative life expectancy (years) Split cooling systems 15 Air Handling Units (internal) 20 Ductwork systems 30-40 Steel pipework distribution 30-40 Copper pipework distribution (water) 45 Valves 15-20 Ancillary air devices (dampers) 10-20 Heat Pump: Air to Water 15 Active Chilled Beams 20 BMS controls devices e.g. sensors/valves 15-20 Building Management System e.g. hardware and software 10 Water, Electricity Meter 20 Variable Speed Drives 15 Water tank – Domestic water 20 Booster pumps – Domestic water 15 Photovoltaic devices 25 Water Harvesting Plant 15 Source – CIBSE Guide M

4.4 Utilities

4.4.1 Existing Utilities, Diversions and Enabling Works

4.4.1.1 Site Wide Services Strategy

The site wide development comprises demolition of the existing building, site clearance and new development of vehicle parking and buildings.

The new utilities connections shall form part of the initial enabling works. Details of the existing and proposed site wide services strategy are indicated on the Harley Haddow feasibility drawings, respectively, 4036-HAH- 00-SW-DR-Z-96- 0100 and 4036-HAH-00-SW-DR-Z-96-0101.

4.4.1.2 Gas

Subject to development of the site and building energy and MEP services delivery strategy there is no requirement for natural gas to serve the site and the proposed MEP heating delivery plant.

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4.4.1.3 Water

A new mains water connection shall be provided to serve the site and the building. This will be taken from the existing Thames Water supplies in the road outside the site

4.4.1.4 Electricity

The building shall be provided with a new utility provider owned LV transformer which will be located in a purpose built integral or external substation which will be constructed as per the local DNO requirements. Preliminary load calculations estimate that the new substation should be rated at 500KVA, however this will need to be confirmed at the next design stages.

4.4.1.5 Communications

The building shall be provided with a new leased line and or general comms service via the existing site infrastructure. The line provision and the required security parameters shall be developed in close conjunction with the Met Police.

4.4.2 Provision for and Liaison with Utility Providers

Utility providers have not been contacted to assess the current infrastructure and works required as part of this feasibility study. Utility providers are to be contacted at the next design stages – RIBA Stage 2.

4.5 Design Conditions

4.5.1 External Design Temperatures

Area Temperature Winter -40C Sat Summer 31.50C db / 200C wb Summer (cooling plant) 350C db

4.5.2 Ventilation Rates

Area Flow Rate Diversity Staff and Office areas (high density) 12 l/s per person None Meeting Rooms 12 l/s per person None Reception 12 l/s per person None Triage (public side) 8 l/s per person None WC’s 12 air changes per hour None Changing 12 air changes per hour None Stores (inc vehicle stores) 3 air changes per hour None Plantrooms 1 air change per hour None Inspection Bays 3 air changes per hour None Circulations Space None None

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4.5.3 Ventilation Filtration

Area Final Filtration Level Offices and Staff areas F7

4.5.4 Internal Design Temperatures

Area Summer Design Winter Design Temperature Temperature (°C) (°C) Offices and Staff areas 24 ± 2 20 ± 2 Triage (public side) Not controlled 18 ± 2 WC’s Not controlled Not controlled Changing Not controlled Not controlled Store Not controlled 16 Kitchen Not controlled 16 Plantrooms Not controlled 16 Information taken from CIBSE Guide A Table 1.5 and BCO Guidance where applicable

4.5.5 Plant Acoustic Criteria

Area Acoustic Rating (NR) Circulations Space 40 Offices and Staff areas 35 WC’s 35 Changing 40 Store 40 Plantrooms 45 Information taken from CIBSE Guide A, Table 1.5 where applicable

4.5.6 Domestic Hot and Cold Water Services

The domestic hot and cold water services installations will comply fully with the requirements of BS 8558:2012 and BS EN 806-1-5, HSE ACOP L8 and the Water Supply (Water Fittings) Regulations 1999.

Installations will be insulated for frost protection and anti-condensation purposes.

Service Design Value Daily Water Demand 40 litres per day per Employee* Cold Water Storage 50% of daily demand* Cold Water Temperature Ambient - Less than 20oC Daily Hot Water Demand 10 litres per day per Employee* Hot Water Flow Temperature 55 oC *Information taken from Institute of Plumbing Guide

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4.5.7 Sanitary Plumbing

The above ground soil and waste drainage systems will be designed and installed in accordance with the modified single stack system III principles of BS EN 12056: Part 2 and part H of the building regulations.

Gravity and pumped condensate drainage will connect to the foul drainage system only.

Appliance Minimum Internal Minimum Depth of Diameter (mm) Seal (mm) Wash Hand Basin 32 75

Sink 40 75

Shower 40 50

Bath 40 50

Urinal Bowl 40 75

WC 100 50 Data for table taken from BS EN 12056 part 2

4.5.8 Internal Gains

Area Small Power People Lighting Sensible Sensible Sensible/Latent Heat Gain Heat Gain Heat Gain (W/m²) (W/m²) (W/person)

Offices and Staff areas 35-45 75 / 50 10 Circulations Space None None 8 WC’s 5 N/A 5 Changing 5 N/A 10 Store 0 N/A 5 Plantrooms 0 N/A 10

4.6 Energy and Sustainability

4.6.1 Energy Compliance

As a new development the Northolt development shall be required to meet the following planning objectives:

4.6.1.1 London Plan (2018)

The London Plan has just completed a period of consultation and is due for amendment late 2018.

We have based our calculations on the basis of the new requirements being in force at the time of planning submission.

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This requires:

Major development should be net zero-carbon in accordance with the following energy hierarchy:

Be lean: use less energy and manage demand during construction and operation. Be clean: exploit local energy resources (such as secondary heat) and supply energy efficiently and cleanly. Be green: generate, store and use renewable energy on-site.

In meeting the zero-carbon target a minimum on-site reduction of at least 35% beyond Building Regulations is expected.

Residential development should aim to achieve 10% of the on-site reduction target, and non-residential development should aim to achieve 15% of this overall target through energy efficiency measures.

Where it is clearly demonstrated that the zero-carbon target cannot be fully achieved on-site, any shortfall should be provided:

Through a cash in lieu contribution to the relevant borough’s carbon offset fund, and/or

Off-site provided that an alternative proposal is identified and delivery is certain.

4.6.1.2 London Borough of Ealing Local Planning Obligations

The local planning authority requires the requirements of the London Plan to be met, and in addition requires the following:

 BREEAM Very Good Rating for new major developments (Local Borough will be required to confirm they are classifying the project as a major development).  All developments must demonstrate a 40% reduction from the 2010 building regulations, with 20% of this through renewable energy generation (this is now superseded with compliance with the 2013 regulations and the London Plan requirements).

4.6.1.3 Met Police Targets

The Met police require all new projects to carry out an energy strategy, this is in line with the requirements of the London Plan. It also requires an overall 35% carbon reduction below Part L in-line with the London Plan to be achieved, with the full 35% reduction achieved on site where technically feasible.

4.6.1.4 Part L2A (2016)

Building Emission Rate (BER) should meet or better the Target Emission Rate (TER) as defined by Part L2A (2016).

4.6.2 Energy Strategy Methodology

A comprehensive strategy approach to address the energy and renewable technologies used on the scheme and how they will be integrated into the proposed development. This will be using the ‘Be Lean’, ‘Be Clean’, ‘Be Green’ approach.

Be Lean – Use less energy

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Be Clean – Supply energy efficiently Be Green – Use renewable energy

Use low and Use less Supply Be Be Be zero carbon energy energy Lean Clean efficiently Green technologies

Energy Hierarchy Approach

Dynamic thermal simulation is a sophisticated form of building energy modelling used for non-domestic buildings. IES Version 2017 software has been used, which is approved National Calculation Method (NCM) simulation software.

It is able to base its performance calculations upon incremental time steps as low as two minutes. This allows realistic variations in fabric thermal storage (thermal mass effects), weather conditions, occupancy, internal and solar gains to be taken into account and their implications upon building/plant operation to be modelled effectively.

Dynamic thermal simulation uses zone specific operational profiles (occupancy, lighting, ventilation and domestic hot water demand) and plant performance data to effectively model and predict the energy performance of a building. This comprehensive approach is considered best practice for assessing building energy performance.

To accurately model the dynamic nature of the building’s thermal response, hourly recorded weather data is used in dynamic thermal simulations. Such weather data contains records of radiation, temperature, humidity, sunshine duration and additionally wind speed and direction.

4.6.2.1 Fuel Emission Factors

The following fuel emissions factors have been used in the calculations:

Fuel CO2 Emission Factor (kgCO2/kWh) Natural Gas 0.216 Grid supplied electricity 0.519 Grid displaced electricity 0.519 Biomass 0.031 Waste Heat 0.058 Carbon Dioxide Emissions Factors

4.6.2.2 Weather Data

To accurately model the dynamic nature of the buildings thermal response, hourly recorded weather data is used in dynamic thermal simulations. Such weather data contains records of radiation, temperature, humidity, sunshine duration and additionally wind speed and direction.

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A CIBSE Test Reference Year (TRY) for London has been used for this analysis as per the National Calculation Method requirements for Building regulations compliance.

4.6.3 Energy Strategy Results

4.6.3.1 Initial Compliance Review

An initial compliance review has been undertaken using the current design proposals to ascertain the likely route to compliance required prior to the completion of the full energy strategy reporting.

Figure 1: IES Model image

The following design parameters have been assumed for the initial assessment: System Performance Parameters Floor: U-Value of 0.18 W/m2K Fabric External Walls: U-Value of 0.20 W/m2K Roof: U-Value of 0.15 W/m2K Personnel Doors: 1.8 W/m2K

Windows with a U-Value of 1.6 W/m2K Glazing Visible Light Transmittance of 71%, g-value 0.399 Air Permeability 7 m3hr/m2 @ 50Pa, to be tested and certified.

Energy Efficient LED Lighting assumed generally: Artificial Lighting . 2 W/m2/100lux . Presence Detection (Auto On/Off) applied to office areas, toilets and locker rooms. Manual Switching to Forensic and car park areas. Extract/specialist extract to highlighted forensic vehicle inspection areas Supply and Extract AHU to office accommodation, specific fan power 1.2 W/l/s Extract ventilation to toilets, specific fan power 0.3 W/l/s Ventilation

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Electric radiant heating to highlighted forensic vehicle inspection areas. Heating Air Source Heat Pump providing heating to office accommodation SCoP 3.5 Cooling Cooling provided to office accommodation via Air Source Heat Pump SEER 3.7

Power Factor >0.95. Correction Domestic Hot Water Electric Instantaneous Hot Water, no storage.

Low Carbon Roof Mounted PV panels, orientated to face South at a 30° mounting angle. Technology Table 1: Baseline Route to Compliance Parameters

The baseline design parameters give the following results: Building Emission Modelling Option Target Emission Rate % Reduction Rate Baseline (30m2 PV) 15.4 15.4 0 PV - 425m2 15.4 9.9 35.7%

The baseline model does not currently pass Part L without the inclusion of some PV panels, a minimum of 30m2 is required in order to pass the requirements of Part L.

However, in order to meet the requirements of the London Plan and the Met Police a 35% reduction should be attempted to be achieved on site. This would require 425m2 of PV panels to be included.

There is a potential option if the area of PV panels cannot be achieved on site that a smaller area could be included with the remaining carbon emission reduction being made up through a carbon levy.

It would however need to be proven that the full amount is unfeasible to the site or technically to meet the Met Police requirements. This is only a viable option under the current London Plan, once the revised London Plan is enforced the full 35% reduction will require to be met on site.

The option for gas radiant heating to the car inspection areas has been reviewed instead of electric radiant heating, this gives a larger carbon reduction margin from Part L without PV of 2.9%, therefore this option would also reduce the amount of PV required to meet the 35% reduction to 325m2.

A further option has been assessed to review the impact of underfloor heating served from the Air Source Heat Pump to the vehicle inspection areas. This would then have supplementary electric radiant heating to boost the heating to the occupied zones in the space. This heating option gives a 4.14% reduction from the Part L target with no PV and would require 320m2 of PV in order to meet the required 35% reduction.

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4.7 Mechanical and Public Health Services

4.7.1 Specialist Design Items

The following systems and items (as applicable) shall be detailed designed and procured under specialist design packages (CDP).

 Sprinklers / Fire Suppression (not in the current scheme)  Underfloor Heating (not in the current scheme)  Exhaust gas treatment and flue  Refrigeration and cold store installations  Automatic Controls (BMS / EMS) & Mechanical equipment and control panels  Fire detection and alarm systems  Public Address and Voice Evac system  CCTV Systems  Access Controls Systems  Intruder Detection Systems  Audio / Visual systems etc  Lightning protection systems  Service supports

The final developed Stage 4 tender information shall provide a performance specification (prescriptive design) in order to procure the above noted specialist packages.

4.7.2 Foul Drainage – Above Ground

The foul water drainage installation shall comprise multiple single stack type systems with additional ventilation where required.

A gravity soil and waste drainage system shall be installed to serve all items of sanitaryware and equipment within the building, complete with suitable ground floor connections into the below ground foul drainage system.

All stacks where practical, shall terminate above roof level with weathering collars and bird guards and be naturally ventilated to prevent pressure fluctuations within the drainage system. All vertical stacks and horizontal stack offsets shall be installed in cast iron to ensure an inherently durable and quiet installation. Sufficient access points are to be allowed for to aid cleaning and maintenance, and will be positioned throughout the soil and waste installation.

All new small diameter waste pipe-work 32mm and 40mm diameter shall be installed using MUPVC.

Fires sleeves shall be provided for MUPVC pipe-work which passes through separate fire compartments.

Preliminary foul water discharge for the accommodation building has been listed below:

Appliance Number Discharge units Total Discharge Flow rate (l/s) per appliance units

Whb’s 36 0.3 10.8 WC 36 1.7 61.2

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Sink (including cleaners) 4 1.3 5.2

Shower 6 0.4 2.4 Totals - 79.6 4.5 L/S Data for table taken from BS EN – 12056 part 2

The gravity drainage system shall discharge to multiple sewer connections in the surrounding areas.

All works shall be carried out in accordance with the Building Regulations 2015 Drainage and Waste Disposal Approved Document H and BS EN 12056-2-2002 part 2.

4.7.3 Incoming Mains Cold Water

A new dedicated mains water connection shall be provided to serve the development via 63Ø Blue MDPE pipework. The new connection shall enter the building within the ground floor plant room where the pipework shall convert to copper and distribute within the building.

4.7.4 Domestic Cold-Water Distribution

The mains water supply to the building shall serve a pre-insulated sectional cold-water storage tank located in the ground floor plant room, the installation shall provide a nominal 2800 litre capacity. The tank will serve all cold water and drinking water outlets and shall therefore be potable.

The tank shall be internally split to allow cleaning and maintenance with no interruption to the water supply.

Mains water from the tanks shall be boosted via a variable speed booster pump with a duty/standby arrangement to provide suitable water pressure at all outlets.

An electro-magnetic water conditioner will be installed after the variable speed booster set to reduce scale build up within the system.

4.7.5 Domestic Hot Water Systems

Due to the low hot water demand for the development including the service block it is proposed to use WRAS approved low volume localised unvented electric water heaters. To ensure adequate access for maintenance these water heaters will be located in cleaner’s cupboards. At Ground Floor level the showers will be served by a single, direct electric storage heater. Hot water shall be provided to achieve 55°C flow. All water service pipework shall be installed to ensure self-draining through the sanitary fittings. Horizontal branch pipework to WC, basins, baths etc shall be above the connection level of the sanitary fittings. All potable water service pipework shall be installed using copper pipe and soldered capillary fittings, insulated in its entirety, etc valves etc. There will be no requirement for a hot water return system serving the hot water outlets due to the close proximity of the hot water heaters. However, should the furthest outlet be more than 10m from the heater then the branch and sub-branches shall be trace heated to offset heat losses. All water services shall be designed and specified in accordance with HSE Approved Code of Practice ACoP L8 “Legionnaire’s Disease”.

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4.7.6 Cooling and Heating Systems

4.7.6.1 Air to Water Heat Pumps

A central Air Source Heat Pump (ASHP) system shall provide the service block with cooling and heating to meet the space conditioning and ventilation loads. The ASHP shall also serve the heaitng load of the various heated vehicle inspection areas.

The anticipated peak loads have been calculated as below:

Service Cooling Heating Peak Space Conditioning Load 250kW 200kW Peak Ventilation Load 50kW 100kW Peak Total Loads 300kW 300kW

Domestic hot water shall be generated by direct electric water heaters and is therefore not included in the load calculation.

The ASHP system shall consist of a high efficiency, modular multi-purpose unit for 4-pipe systems with scroll compressors, 2 refrigerant circuits, plate heat exchangers for the user-side cooling and heating circuits, air source and axial fans and integral buffer vessels.

To allow for an approximate redundancy the unit shall be sized to operate at a peak cooling load of 250kW and shall contain a minimum of two compressors to cover maintenance and breakdown.

The multi-purpose unit shall have the capacity for heat recovery during periods when there is a simultaneous cooling and heating demand.

Typical Air to Water Heat Pump

4.7.6.2 LTHW and Chilled Water Circuits

The majority of the space conditioning and ventilation systems shall be served by the central ASHP system providing heating and cooling via a 4 pipe arrangement.

The heated car examination areas will be heated via underfloor heating embedded within the structural make up of the floor. The underfloor heating installation shall be configured generally to maintain a space temperature of circa 16oC with set back to 12oC during hours of non-occupation.

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The primary pipework from the ASHP shall serve dedicated chilled and LTHW buffer vessels integrated within the packaged heat pump system.

System Flow / Return Temperatures LTHW AHU CT Circuit 45ºC flow - 40ºC return (ΔT 5K) LTHW ACB CT Circuit 45ºC flow - 40ºC return (ΔT 5K) CW ACB CT Circuit 15ºC flow - 18ºC return (ΔT 3K) CW AHU CT Circuit 15ºC flow - 18ºC return (ΔT 3K)

The system shall consist of dedicated circuits (chilled water and LTHW) for both the ventilation plant i.e the AHU heating and cooling coils and for the space conditioning unit’s i.e. 4 pipe connections to the active chilled beams. All circuits will be constant temperature (CT) and variable flow. All circuits shall be distributed from the roof plant enclosure to the relevant locations via associated single head duty and standby pumps and shall incorporate variable speed drives that will respond to increases/decreases in circuit pressure.

Pipework shall distribute via dedicated mechanical risers with branch connections serving each floor, the circuits for each floor shall be installed within the dropped services bulkhead on the perimeter of the central core.

Isolation valves and drain cocks shall be fitted on branch pipework serving risers with access provided for maintenance.

Commissioning sets shall be provided on the systems to enable suitable balancing of heating circuits. These shall only be installed in accessible areas.

Pipework shall be insulated in accordance with BS5970 in foil faced mineral fibre. Plantroom insulation shall be finished in aluminium hammer clad. Pipework shall be labelled in accordance with BS 1710.

4.7.7 Local Cooling

Areas of local cooling that are not connected to the build’s central ASHP system are considered to be limited to areas where high heat loads and low occupancy are expected, such as IT/server rooms.

In these areas local split DX refrigerant heating and cooling systems shall be provided.

IT/server rooms shall be via run and standby systems capable of meeting the full cooling duty and the standby unit shall be initiated in the event of failure of the duty unit. The units will be controlled by integral controls for switch-over and to achieve the desired set point temperature.

The external condensers shall be located at roof level.

4.7.8 Central Heating and Cooling

Comfort cooling and space heating to the office areas shall be provided by 4 pipe fan coil units with ducted supply air and return air connections to linear diffuser grilles installed at high level within a ceiling void.

The active chilled beams shall provide centrally conditioned primary air (fresh air) to the spaces via the roof mounted AHUs and use heat exchangers served by the 4 pipe heating/cooling circuits to provide cooling and/or heating. The units shall be sized to meet the internal heating/cooling loads and fresh air requirements to the spaces.

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Typical 4 pipe Fan Coil Unit

4.7.9 Central Ventilation

4.7.9.1 Central Ventilation Arrangement

It is proposed that a single central air handling unit (AHU) shall serve the service building to reduce the size of the central ventilation plant. The unit shall provide tempered (heated or cooled air) to the Office areas.

The unit shall deliver approximately 1.8m3/s of fresh air supply and extract ventilation.

It shall be noted that the density of occupation within the open plan offices is assumed to be circa 1 person per 8m2.

Ventilation ductwork shall distribute at roof level to designated mechanical risers and drop to serve each floor. Branch connections from the primary ventilation duct work shall be provided with suitable control dampers to allow the ventilation system to efficiently respond to air quality and occupancy status.

4.7.9.2 AHU 01

The central AHU shall be located within the Ground Floor plantroom and shall consist of supply and extract fans with heat recovery via rotary heat exchanger and shall include F7 air filters. The units shall have separate heating and cooling coils served via LTHW and chilled water circuits provided by the central ASHP and shall include a dehumidification function to control RH levels of the supply air.

The AHU shall intake and discharge at the facade and shall be provided with suitable attenuation to limit noise breakout from the fans and shall be supported by anti-vibration footings to avoid transfer to the building structure.

4.7.10 Local and Special Ventilation

Local extract ventilation shall be provided to serve the vehicle storage areas and the vehicle inspection areas including a specialist exhaust extract system to serve the RTPC ramp area. The fan systems shall be designed to provide the required ventilation rates to the ‘garage areas’ served either with full supply and

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extract ventilation system or in some instances with local extract ventilation systems combined with louvred areas with actuated dampers. The strategy for the various non office areas in the development is summarised as below. Area Ventilation Forensic/Test Bays Local exhaust ventilation extract (Nederman or equiv)

RTPC Mechanical extract ventilation + Vehicle Waiting Exam Examination actuated louvres, controlled by air quality Internal Secure Parking Smoke Control*

*As per the Fire Engineer’s recommendations The service office block shall be provided with local WC toilet extract system mounted at roof level and ducted to serve WC’s, changing and the Shower areas. PIR sensors and overrun timers shall control the boost/trickle operation of the fan.

4.8 Electrical Services

4.8.1 Electrical Incoming Services Design

4.8.1.1 Incoming Electrical Services

The new building will be served by a utility owned substation located within the site in either an internal or external enclosure. The current load study indicates that a 500KVA substation will be required, however this will have to be confirmed at the next design stages.

The building shall be provided with two switchboards which will be responsible for serving all essential and non-essential services. The incoming supply cable(s) to the new building will terminate directly into the non- essential main electrical switchboard in the electrical switch room. The main electrical switchboard shall feed all non-essential services and feed an automatic transfer switch (ATS). The ATS shall serve the essential switchboard and will act as a changeover between the normal electrical supply and the generator.

From the main switchboard and essential switchboard, sub-main distribution, utilising steel wire armoured cabling will pass up the building through riser(s) and traverse across the floor plate in ceiling or floor voids, to supply lifts, data/comms equipment, mechanical equipment, motor control centres and distribution boards etc.

The main switchboards will be constructed to withstand the maximum combined potential fault current of both the substation and generator and is to be determined during detailed design.

Space will be allowed for future provision of power factor correction capacitors and harmonic filtering equipment should, following completion of the facility, testing highlight a need for this equipment.

Photo Voltaic Panels The quantity of Photo Voltaic panels (PV) will be developed during the detailed design stage targeting the required BREEAM credits and where required satisfying Part L.

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Relays such as the G59 will be installed to ensure any power generating equipment is disconnected from the system in case of mains failure. The type of relay will be determined by the amount of the PV panels, which will be developed during the next stage of design.

The power generated by the PV installation will not be large enough to exceed the electrical base load of the facility, therefore no opportunity to back feed to the grid is foreseeable.

Inverters will be located on the roof, with power inserted into the system via the nearest distribution board.

4.8.1.2 Incoming Data and Communication Services

The main incoming data/communication connections will be fed into the building via underground duct, entering into the designated data room within the facility.

Data and Communications Systems

Design and integration of these systems will be progressed during the next design stages.

Security Systems

Design and integration of these systems will be progressed during the next design stages.

4.8.2 Electric Mains and Sub-Mains Distribution

The low voltage installation will be in accordance with BS 7671, supplying power and lighting circuits as required.

Switchboards and electrical distribution boards shall be designed with a minimum 20% spare capacity for future expansion.

4.8.2.1 Low Voltage Distribution

The electrical distribution systems, including cables and distribution boards will be sized to have 20% spare capacity and where supplying sensitive electronic equipment, distribution boards will be fitted with suitable surge suppression

Small Power and Lighting

For all areas, small power and lighting will be fed from three-phase, split load power and lighting MCB distribution boards, utilising integral meters to monitor energy consumption for both small power and lighting in compliance with Part L of the building regulations. The split distribution boards will be located within the risers as identified on the concept electrical layouts.

Mechanical Equipment

Major mechanical equipment will be provided with a local Motor Control Centre (MCC) or appropriate Mechanical Control Panel (MCP) local to the equipment inside the plant room/area.

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Mechanical equipment located in plant rooms will be powered by circuits emanating from the local MCC or MCP.

Small mechanical equipment, such as, toilet extract fans, dampers or valves will be connected to a fuse connection unit (FCU) supplied from the nearest small power and lighting distribution board.

Data Room

Data rooms will be provided with a single-phase distribution board and a dedicated earth connection linked back to the buildings main earth bar for the purpose of supplying power to data racks.

Distribution Boards

Final circuit distribution boards shall comprise of the following:

 Corrosion resistant construction with durable finish.  Have IP31 degree of protection.  Have hinged lockable doors.  Have integral main incoming switch disconnectors, shunt trips or MCCB where specified or deemed necessary to fulfil appropriate regulations.  Have cable extension boxes where required  MCB’s to have 10kA minimum fault withstand rating  Be fitted with captive blanking plates on unused ways  Be fitted with residual current devices (RCBO’s), contactors or other auxiliary devices as described in other parts of this specification.  Matching adjacent enclosure (if required) by the same manufacturer  Have all terminals and outgoing cables marked indelibly with circuit references and phase, by using proprietary labels or cable ferrules as appropriate  Be fitted with engraved ‘Traffolyte’ labels (mechanically fixed) to the front face  Dual earth bars to allow connection of small power outlets with high integrity earthing.

Typical Final Circuit Distribution Board

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Protective Devices

Protective devices will be selected to provide a co-ordinated system which will discriminate, ensuring a short circuit or overload fault condition will be cleared by the protective device immediately upstream of the fault, without causing the unnecessary operation of protective devices further upstream.

Protective devices should be rated to withstand the anticipated fault current to ensure a fault does not cause detrimental effect to the distribution system. All protective devices will be provided with a means of locking the device in the off position to ensure safe operation of maintenance engineers. Submain distribution will be protected by Moulded Case Circuit Breakers (MCCBs).

Final circuits shall be protected using miniature circuit breakers (MCB's) for lighting circuits and residual- current circuit breakers (RCBO's) for small power applications. Circuits that will not have RCD protection are ICT servers, security and electronic door lock/access equipment. RCBO's shall occupy one distribution board way space.

Electrical Cabling Cables will be sized in accordance with the IEE Regulations (BS 7671).

Cables will be sized to take account of design current, current carrying capacity, voltage drop, method of installation, grouping, ambient temperature, type of protective device and prospective fault currents. Under no circumstances will cables have a current carrying capacity less than the rating of their associated protective device.

Sub–Main Cabling

XLPE/SWA/LS0H armoured cabling within buildings will be cleated onto cable trays or cable ladders as required.

Final Circuit Cabling

Final circuits will be wired utilising single core cables with stranded annealed copper conductors with low smoke zero halogen insulation.

Emergency Lighting Circuit Cabling

Where central battery systems are utilised, emergency Lighting circuits will be wired in multicore fire-resistant cabling complying with BS 7629.

Backup Generator

The building shall be provided with a standby backup diesel generator with sufficient fuel to operate for 8- hours (day tank). The generator under this feasibility study it is assumed that the generator shall be rated to supply the full electrical load of the building. However, this is to be further developed in coordination with the client in the next design stages.

Power Factor Correction

The operating power factor is difficult to accurately quantify at the current design stage. Due to the nature of modern electronics, there is the potential that minimal power factor correction would be required and the harmonic distortion on the building would be the major factor distorting the power supply.

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It is not recommended that power factor correction measure is installed as part of the initial building fit out, but post completion and occupation testing should be utilised to prove the device is necessary and to ensure the correctly sized device is installed.

During further detailed design stages, an initially analysis will be carried out to ensure a suitable protective device is allowed for the connection of future devices

Harmonics

The magnitude of potential Harmonic distortion is difficult to accurately quantify at the design stage. There is the potential that the harmonic distortion on a building of this type and usage could exceed the limits set out in Engineering recommendation G5/4.

It is not recommended that Harmonic mitigating measure are installed as part of the initial building fit out, but post completion and occupation testing should be utilised to prove the device is necessary and to ensure the correctly sized device is used.

During the further detailed design stages, an initially analysis will be carried out to ensure a suitable protective device is allowed for the connection of future devices.

4.8.2.2 Energy Metering Metering is a key part of the feedback mechanisms essential to monitor the status and operation of the building systems, allowing the building facilities manager(s) to determine and manage energy consumption. Generally, the electrical metering strategy will ensure the main incoming supply plus the following items/equipment are monitored, whilst satisfying the credits identified in the BREEAM assessment.

Plant Item Rated Input Power (kW) Hot water generating installations supplied direct from the building main switchboard >10 Chiller installations comprising supplied direct from the building main switchboard >10 Electric humidifiers >10 Motor control centres providing power to fans and pumps >10 Final electrical distribution boards >5

Meters with pulse outputs or other communication protocols with the ability to be interfaced with the BEMS system for monitoring and data logging usage will be utilised.

All electrical energy monitoring meters will be multifunction digital meters measuring V, A, kW, kVA, kVAr, PF.

4.8.2.3 Containment Systems

All cabling will be distributed around the building utilising appropriate industry standard cable containment systems. Containment systems will run through ceiling voids and raised access floors, utilising the solution which provides the most flexibility for specific areas.

The distribution systems will rise through the building utilising the provided riser compartments. Systems within risers will consist of power, data, comms, security and all other ELV circuits.

Cable containment will generally be:

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 Perforated steel galvanised cable tray for Sub-main cables  Steel galvanised trunking and conduits for small power and lighting circuits  Steel galvanised cable basket for primary data, communications and ELV cable containment routes  Metal conduits for secondary data, communications and ELV cable containment routes  PVC ducts for below ground distribution

Cable containment systems shall be supported by common coordinated service support brackets fixed to soffits or walls, specifically manufactured for the purpose of carrying cable management systems.

Above ground external cable containment will be by suitably galvanised steel containment systems of a heavy-duty construction unless indicated otherwise.

Final circuit distribution will be via trunking and conduits concealed in ceilings voids, floor voids and walls, with outlets recessing in walls or contained in floor boxes as appropriate. In order to provide flexibility, offices will be provided with floor boxes for power and data.

External column mounted lighting and CCTV systems shall be fed by dedicated PVC ducts as part of a pit and duct system.

All electrically conductive containment systems shall be electrically continuous and treated/painted where exposed to the detrimental elements and ‘Denso’ wrapped where cast in concrete.

Where cables and cable containment systems pass through a wall, constituting separate fire compartments, the penetration shall be sealed after cable installation using a proprietary, intumescent non-shrinking fire stopping method. The method shall provide a fire resistance at least equal to the rating of the entire wall and shall provide an easy method of breakthrough and resealing to allow future installation of more cables if necessary.

Separate containment systems will be provided for the distribution of fire rated cables, providing circuits to emergency lighting and evacuation lifts. The containment system, including supports and cleats will have fire resistance equal to or greater than that of the cables they support.

4.8.3 Power Installations

A small power installation will be provided, generally formed of socket outlets, floor boxes, fuse spur units and isolators as required to power all devices required to ensure a fully functioning building.

Generally, the installation will be flush, with containment concealed within voids or recessed into the fabric of the building. Only within plant areas will the installation be surface mounted.

Offices, Receptions and Meeting Rooms

To provide flexibility and a modern office environment, a raised access floor will be utilised to install floor boxes for desk position power and data.

Serving the floor boxes will be a system of underfloor power trunking with equally spaced tap-off connections, allowing easy adaptability and future amendments to floor box layouts.

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Typical Example of Floor Boxes and Underground Power Trunking

Tea-points

Tea-points will be provided with power outlets mounted flush to the wall finish, with back boxes recessed in to the building fabric. Outlets will generally be positioned above the counter top. Where below counter equipment requires power, an above counter fuse spur will switch a below counter un-switched socket outlet.

Lockers, Changing and Showers

Locker areas will be developed further during the detailed design stages, but at this stage, it is hoped outlets will provided integrated with vanity units, whilst observing BS7671 special areas.

Hot water to shower and locker areas will be provided by a centralised system, therefore, the electrical installation doesn’t make allowance for individual electric shower units.

Car Park Areas

The car park areas shall be provided with weatherproof surface mounted socket outlets, fused connection units and isolators located in either high level or low level as per client requirements.

Positioning and Layouts of Electrical Outlets

For all areas of the building, locations and quantities of outlets will be developed during the detailed design stage.

4.8.4 Lighting Installations

Normal Lighting

Lighting systems throughout the building shall be designed for maximum energy efficiency via the use of presence/absence detectors and daylight monitoring. Light sources shall generally be LED type and will be rated at maintaining at least 80% of their initial output after 50,000 hours of operation. The lighting design shall generally comply with the requirements of the Building regulations L2A and L2B and split into three sections:

Circulation lighting: lighting designed to facilitate safe and efficient movement about the space. This includes emergency escape lighting.

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Task lighting: lighting designed to provide localised solutions to the tasks that are being undertaken whether they are DSE tasks, person to person communication or paper-based tasks.

Car park lighting: lighting designed to provide general lighting within the car parks enabling both safe and efficient movement of vehicles and providing sufficient illumination to enable work tasks to be carried out by personnel. All lighting within the car parks is to be impact resistant and IP65+.

External Lighting/Car Park Lighting

Where required, steel column lighting shall be utilised to provide the illumination of the site perimeter and areas of the car park. The luminaires located within the columns shall be fed via cables located within a PVC pit and duct system.

Emergency Lighting

Emergency lighting within the building shall utilise a combination of maintained and non-maintained self-contained luminaires and shall fully comply with the requirements of BS 5266-1.

Lighting Controls

The lighting system shall be controlled by a DALI addressable lighting system with local and central inputs. The lighting controls shall be focused on enhancing the lighting system efficiency whilst maintaining safety and user satisfaction.

The lighting control shall be selected based on value for money, functionality and simplicity to use and maintain.

Lighting Control Methodology

In automatic system shall ensure the lighting system is only activated when required. Lighting shall be switched off or dimmed when a space is vacant or daylight is sufficient. Exclusive manual control shall only be used where safety and security are of a particular importance or a space is individually owned such as a cell office. Generally, the control methodology system shall be formed from four strategies as shown below. The means of control is shown in the table below.

 Manual Control: The luminaires will need to be manually activated and de-activated via local wall mounted switches.  Presence Control: The luminaires will be controlled via presence detectors. These will turn lighting on when movement is detected and off after 30 minutes of no movement.  Absence Control: The luminaires will be manually activated and de-activated via local wall mounted switches. However, should no movement be detected after 30 minutes, the luminaires will be turned off.  Time-clock: The luminaires are switched on and off via pre-programmed time functions.

Area Control Overview Office Local scene setting control from a single point Meeting Rooms Automatic control via presence and daylight detection with manual overrides Staircase / Corridors Automatic control via presence and daylight detection Stores Automatic control via absence detection Toilets Automatic control via presence and daylight detection Plant Automatic control via absence detection External Areas Automatic control via Time-clock and Daylight monitoring

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4.8.5 Uninterruptable Power Systems (UPS)

Fire Alarms and Emergency Notification Systems

Fire alarms and emergency notification systems will be provided with battery back-up units mounted immediately adjacent to the systems control panel.

Battery units will provide 48 hours back-up.

Data and Communications

All Data and IT systems shall be backed up by a transformer less uninterruptable power supply. The UPS shall be sized to accommodate the IT system and Security system as well as the losses within the UPS and battery charger. The UPS shall be provided with a maintenance bypass and shall feature hot swappable modules. The system shall have a minimum autonomy of 30min at the end of life of the batteries. The batteries used for the UPS shall have a minimum life of 10 years.

Security Systems

4.8.6 Earthing and Bonding Systems

A full earthing and bonding installation will be provided in accordance with BS7671 and BS 7430. The building will take a Low Voltage supply from the network and the earth point for each system will be provided as an earth bar in the corresponding incoming plantroom or electrical riser.

The earthing arrangement of the systems will be TN-C-S. All electrical supplies will be provided with a separate Cu earthing conductor or separate circuit protective conductor. Metallic cable containment systems or cable armour will not be utilised as a sole means of providing a protective conductor.

All extraneous metalwork will be bonded to the nearest electrical distribution board main earth bar. Main bonding conductors will be run to all main incoming pipework and lightning protection systems back to the nearest main earth bar.

Supplementary bonding conductors to be run and connected to the following:

(a) The pipework and ductwork associated with all mechanical services; (b) Cable tray, ladder rack and trunking; (c) Lifts; (d) Bathrooms and Kitchens; (e) As required by BS 7671 Part 7, Special Locations; (f) Building Envelope Metallic Cladding

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All cable tray, ladder rack, trunking etc to be bonded together throughout their respective lengths. A main bond between the main building earth bar and the lightning protection system network will be provided.

4.8.7 Vertical Transportation

Vertical Transport will be provided to the building, which will be compliant with the Lift Directive 2014/33/EU (95/16/EC recast) and all current British Standards including the EN81 series of documents as appropriate for the installation. Also included will be compliance with the Equality Act, BS9999 and all codes of practice to ensure that access for all is applied to all vertical transport.

Vehicle Lifts

As part of this feasibility study Harley Haddow has contacted and obtained a preliminary quote from a lift manufacturer for two lifts capable of lifting a lorry. Based on this quotation, provision has been made to allow for the installation of two hydraulic vehicle lifts capable of lifting a total of 15000kg each and having a lift car with dimensions of 9000x6200x4000 (WxDxH). The lift plant shall be located within a separate lift motor room and shall be provided with both a three phase and single-phase supply as per the manufacturer requirements.

4.8.8 Fire and Lightning Protection

4.8.8.1 Fire Detection Systems

A fully automatically addressable fire alarm and detection system shall be installed, providing total coverage throughout the building and shall comply with BS 5839 and BS EN 54. The fire alarm system shall be ‘open protocol’ type. The fire detection and alarm systems shall be designed, installed and commissioned to provide full compliance with BS 5839 category L1 (to be confirmed by the Fire Engineer). Generally automatic detection shall be provided throughout the building as well as all ceiling and floor voids which are 800mm deep or greater. The fire alarm system shall consist of manual break glass call points (complete with lift up protective covers to reduce false alarms in out of view areas), automatic smoke and heat detectors, electronic sounder/strobe units and suitable interface modules to suit the building layout. Combined smoke/heat detectors shall be utilised to allow adjustment of sensitivity thresholds. Where required Aspirating Smoke detection systems shall be utilised as opposed to smoke/heat detectors.

4.8.8.2 Lightning Protection

The building structure shall be protected with a Lightning Protection System in accordance with BS EN 62305-3:2011.

All external cables entering the building shall be protected by the suitable level of Surge Protection Devices (SPD).

The system will include provision of the following components:

 Air termination network  Down conductor network  Earth termination network  Bonding of extraneous metalwork and plant  Electronic equipment surge protection

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The components of the lightning protection system shall where possible be concealed from public view, both internally and externally to minimise impact on the buildings aesthetics.

Air Terminations

A network of copper conductor tapes shall be run along parapets and across the top of roof finishes to create a suitable air termination network. In addition, any metallic frames, antennae, roof plant etc will be bonded to the air termination network.

Down Conductors

Where practical the structural, steel will be utilised as down conductors for the lightning protection down conductor network. The structural designs will be reviewed to ensure that this is possible, where this is not possible, down conductor tapes will be utilised. The fixings, connections and terminations will all comply with BS EN 62305-3:2011 recommendations.

Earth Termination

Earth termination shall be provided via the use of Earth rods. Connections to down conductors shall be made using removable clamps to allow future testing of earth pits. Where buried services impede the use of driven rods, earth mats will be considered as an alternative.

Bonding of Extraneous Metalwork and Plant

The extraneous metalwork and plant will be bonded to the lightning protection system. Lift installation guide rails will be bonded to the lighting protection systems in line with BS EN 62305-3:2011.

Refer to lightning protection layouts and schematic.

4.8.9 Communication and Security Control Systems

4.8.9.1 Communication Systems

ICT (Data, Comms & Voice)

An integrated structured cabling system will be provided throughout the building. Cabling to data points around the building will be by Cat6.

The structured cabling installation shall be designed, installed tested and commissioned to meet the following standards:

 CENELEC  BS EN 50173  BS EN 50174  BS EN 6701  EIA/TIA standards

Wireless coverage shall be available providing strong signal strength over the entire building.

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AV Connection

The AV solution and design shall be developed by the Client and End User during the detailed design stage. Containment shall be provided, terminated and contain draw wires facilitating a later fit out of AV.

Induction Loop

Induction Loop systems shall be provided at the counters and any publicly accessible areas.

The system shall give users of conventional ‘telecoil’ hearing aids an improvement in sound quality above the sound quality when using the hearing aid alone and be the Audio Frequency Loop System Type (AFILS).

All processing equipment such as loop drivers and amplifiers shall be located within the reception/counter furniture.

The system shall be of the ‘low overspill’ type to ensure that there is no loop radiation outside the area covered and no interaction with adjacent AV and induction loop systems.

Disabled Alarm

Accessible WC’s shall be provided with an integrated disabled alarm system which shall allow the occupant to signal for assistance. Alarms shall be generated by the operation of a pull cord switch or call button on the call/reset unit. A local over-door indicator light shall provide visual indication of an alarm condition locally. The main reception shall be notified of any alarms generated.

Refuge alarm and intercom

Disabled Refuge intercom facilities shall be provided throughout the building to assist with location and evacuation of persons in an emergency situation. The disabled refuge system panel shall allow for two-way communication with each intercom unit and shall be interfaced with the Fire Alarm panel.

4.8.9.2 Security Systems

Incoming ducts, risers and distribution routes have been considered to allow networks and power supplies to support the installation of security systems equipment.

The building shall be provided with an intruder detection system, complete with .

The security design shall be further developed in the next design stages in close coordination with MET Police.

CCTV

Comprehensive CCTV coverage will be provided to the public access areas of the building generally covering:

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Where required external CCTV monitoring the building perimeter and car park shall be mounted on steel columns. Cabling feeding the CCTV shall be located within a PVC pit and duct system.

The CCTV system will operate and if required, a . The CCTV design shall be further developed in the next design stages in close coordination with MET Police.

ACCESS CONTROL

A form of access control will be provided on all the floors within the building. The type of access control system will be determined at the next stage of design.

General back of house doors which also includes access to other floors will .

For specialist back of house such as . The access control design shall be further developed in the next design stages in close coordination with MET Police.

4.9 Central Building Management System

The building shall be served with a LAN based control installation which shall provide a user interface for monitoring and control of the supply & extract AHUs, extract fans, ASHP systems, pumps, CWS storage and booster and metering.

The controls system will be IP based and take the monitoring and control of all plant/points back to a central PC in the back of house office area but also accessible any assigned network PC around the building.

The overall BMS strategy shall be developed in the next design stages.

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5.0 Civil / Structural Design Philosophy

5.1 General Project Information

5.1.1 Introduction

This report will outline the civil / structural design strategy for the redevelopment of the Northolt site relative to the Option 4 and 5 layouts and variations proposed during client meeting in November 2018.

5.1.2 The Buildings

The redevelopment of the Northolt site will combine operations at Perivale and Northolt.

Option 4 layout is a three storey steel framed building with a GIA of 18,647m2, ground floor plus 2 upper floors. Ground floor level will be used for inspection and testing of vehicles. The upper floors are used as storage for cars and vans. Office accommodation is located to the north of the structure. Access to the upper floor car storage is via a vehicular ramp and 2no vehicle lifts. Pedestrian access to the upper floors are via 3no stair cases and 1no passenger lift.

Option 5 layout is a two storey steel frame building with the accommodation area being single storey and a GIA of 8,627m2, ground floor plus 1 upper level, roof top parking for storing cars and vans. Access to the upper floor car storage is via a vehicular ramp and 2no vehicle lifts. Pedestrian access to the upper floors are via 3no stair cases.

The site is roughly rectangular in shape located on the Northolt area of London. The site is bounded to the North-West by Rowdell Road and South-East by the Grand Junction Canal. To the South-West and North-East the site is bound by neighbouring industrial/commercial properties.

The site is currently occupied by a single storey portal frame structure. This will be demolished as part of the development of the site.

There is currently no stage 1 desk top information available for this site. However, a search of the British Geological survey site indicates that the natural soils is soft-firm London Clay.

A stage 1 desk top and stage 2 geotechnical site investigation will need to be carried out to determine the geotechnical properties and contamination of the site.

5.2 Structural Scheme

5.2.1 Foundations

Foundations will be reinforced concrete pile caps.

Pile caps are generally double pile caps. However at braced bay locations the number of piles below each column will increase to a 4 with the pile cap dimensions increase in size to suit.

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Double pile cap sizes are 2.1m x 0.75m x1.0m deep. Concrete grade is C32/40 for all pile caps with a reinforcement allowance of 60 kg/m3.

4 pile cap sizes are 2.1m x 2.1m x1.0m deep. Concrete grade is C32/40 for all pile caps with a reinforcement allowance of 90 kg/m3.

Piles are 450mm diameter auger piles and are to be sub-contractor designed. The length of piles are approximately 40m long. The design is based on pile capacities of 450kN Compression. Where tension and lateral forces develop at bracing locations each pile will be designed to suit.

Reinforced ground beams will provide support for walls and provide lateral ties for pile caps. Ground beams are typically 600mm wide x 700mm deep spanning between pile caps. Concrete grade is C32/40 with a reinforcement allowance of 90 kg/m3.

At lift locations the lit pits will be constructed in reinforced concrete with 200mm thick slab supported on piles and 200mm thick walls up to ground level. The lift pit are 1400mm deep, but are subject to change to suit lift supplier’s requirements.

5.2.2 Floor Slab

The ground floor slab will be a 200mm thick ground bearing reinforced concrete slab with A393 mesh at 40mm cover from the top face. The concrete grade will C32/40. The slab is laid on top of an Architect’s specified DPM which in turn will be laid on top of 50mm sand blinding and 450mm of rolled and compacted type 1 granular material. Construction joints, movement joints and induced joints will be set out at between 6m and 9m subject to the contractor’s construction methods. The slab will be laid to fall to facilitate drainage

The foundations and ground slab design will be subject to the findings of geotechnical site investigations

5.2.3 Structural Frame

The structural frame will be constructed in hot rolled steelwork with a minimum steel grade of S355. Steelwork columns and beams are detailed on Harley Haddow drawings. The columns have been set out to accommodate parking bay positions. However, as the bay layout is not consistent from floor to floor it will be necessary to re-arrange the bays to suit. The steel frame is to 60 minute fire resistance, as the steel is exposed this will be achieved by treating the steel with intumescent paint.

The vehicle storage upper floors will be either:

 Option 1 - 150mm thick composite concrete slabs. The floor slabs will act compositely with support UB beams through provision of shear studs. The concrete grade is C32/40 and the decking is a Kingspan MD60-V2 with a 0.9mm gauge throughout. Mesh within composite slabs is generally A252 mesh with H10 loose ‘U’ bars around the perimeter and openings.  Option 2 – as option 1 above with slab supported by Cellform beams.  Option 3 – 200mm thick precast hollowcore slab with a 50mm thick screed support by UB beams.  Option 4 – 200mm thick precast hollowcore slab with a 50mm thick screed support by cellform beams.  Option 5 - as option 1 above.

The steel beams will have falls towards the column lines to facilitate drainage.

Concrete slab to have a power float finish.

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To the west of the site the first floor is set back approx. 32/37 metres resulting in a double height space above the ground slab. At this area the second floor slab is supported on 3.1 m deep steel girders.

The office block floors to the north of the site will be 150mm thick composite concrete slabs. The floor slabs will act compositely with support beams through provision of shear studs. The concrete grade is C32/40 and the decking is a Kingspan MD60-V2 with a 0.9mm gauge throughout. Mesh within composite slabs is generally A252 mesh with H10 loose ‘U’ bars around the perimeter and openings.

External walls will be double leaved masonry with associated windposts. At the car park levels the windposts are designed to withstand vehicle impact and are 200x200x8 SHS set out at 3.65m maximum centres. A 200x200x8 SHS horizontal section spanning between posts is also included.

Allowance should be made for Amco barriers to be installed in front of the parapet walls.

Internal walls in the office block will be constructed with SFS studs sheeted with traditional plaster board. Steel framing will be required around door openings.

Due to the plan size of this development it will be necessary to introduce movement joints. These joints are designed as slotted connections to allow for lateral movement. Alternatively the joints can be accommodated by introduction of double row of columns either side of the buildings movement joints.

From the preliminary design options the steel tonnages are estimated as:

 Steel frame with composite metal deck slabs supported on UB sections– 1900T  Steel frame with composite metal deck slabs supported on Cellform beam sections– 1650T  Steel frame with precast concrete slabs supported on UB sections– 1780T  Steel frame with precast concrete slabs supported on Cellform sections– 1675T

The above tonnages include allowances for bracing, windposts, door framing and steel connections.

5.2.4 Roof

The roof is to be formed with cold formed metal purlins; allow for Kingspan M205065220 purlins set out at typically 1.2m centre and at 0.6m centres at roof edge for 3.6m. The purlins will be support on hot rolled UB sections.

Steel tonnage for the purlins is estimated at 70T.

Refer Architect’s specification for roof cladding. The cladding is to support PV units. It is assumed that the roof will not be accessible other than for maintenance requirements.

The roof will be laid to fall to facilitate drainage.

5.2.5 Stability

Stability of the structure is provided by vertical bracing throughout the structure in two general forms of flat bar cross bracing and SHS ‘k’ and diagonal bracing. The composite floors are used throughout as rigid slabs which provide a diaphragm resistance and transfer the loads to braced bays. Plan bracing is provided at every roof level and is generally in the form of CHS diagonals. The purlins are also used to assist the bracing by providing again a diaphragm resistance.

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Further stability is achieved by wind frames where the open nature of the ground floor layout and setting out of movement joints prohibit the use of vertical bracing.

The layout of the structure mat be subject to change as the design develops through further design stages.

5.3 Civil Scheme

5.3.1 Access

The Northolt development proposal roughly maintains the two existing access arrangements off Rowdell Road. However due to the movement of services, it is anticipated that the number and type of vehicle trips will increase in both number, size and frequency of vehicles. Therefore, the proposal should be assessed in relation to the detailing and arrangement of the access/egress points and will likely result in the widening of the junction radii to accommodate larger vehicle transports utilized for the proposed services.

The proposed access arrangement must also accommodate the access security arrangements as discussed with the client representatives at recent meetings, including air gapped gate system on both the access and egress routes.

Rowdell Road is known to accommodate on street parking on both sides of the carriageway with limited restrictions in place. A review of the swept paths of larger vehicle transports will be required on Rowdell Road in proximity to the access and egress junctions to ensure adequate manoeuvring of vehicles and may require parking restrictions to be implemented through Traffic Regulation Orders to accommodate the proposed uses of the development site.

5.3.2 Internal Vehicle Movements

Internal vehicle movement are to include assisted movement of non-running vehicles for storage and assessment. As such a number of internal parking spaces must be angled to assist in the placement and removal of these vehicles.

Larger vehicle manoeuvres must also be accommodated with the delivery of some vehicles by vehicle transports or hiab capable lorries and recovery vehicles. Adequate manoeuvring space for these vehicles must be allowed for throughout the proposed parking and structural layout, and although the secondary egress gate is made available, primary movement are to be established through the main access and egress gates to the northern access. Design of the ground and first floor structures are also to accommodate the movement of hiab capable lorries and recovery vehicles for the drop off and pickup of non-running vehicles.

Suitable drop of and collection spaces have been allowed for within the layout, however it should be proven that the use of these areas does no impede other vehicular movement around the development site when in use.

All vehicle movement are to be assessed through vehicle tracking assessments during the viability design of the development.

5.3.3 Topography

The development site at Northolt is located to the East side of Rowdell Road, bounded to the West by Rowdell Road, by industrial properties to the North and South, and to the East by the Grand Union Canal and tow path separated by a small strip of green space.

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The development gently slopes from Rowdell drive towards the Southern boundary and is currently sited with industrial building in use by the Metropolitan Police Service and is otherwise covered with concrete hard standings.

The South East corner is currently retained by a brick retaining wall to a height of approximately 1m.

The boundary of the development is encircled with security fencing.

5.3.4 Surface Water Drainage

It has not currently been feasible to confirm the current surface water drainage network within the site boundary, and at the appropriate time a CCTV Survey of the development drainage is recommended, however from visual inspection of the development and review of the drainage network records for the area, it is assumed that the surface water drainage for the development is discharged to the Great Union Canal to the East. It is also assumed at this time that the surface water flows are routed through holding tanks and petrol interceptors prior to discharge.

The proposed development surface water drainage strategy will include a separate surface water drainage system including SUDS requirements to current guidance to better the existing surface water discharge in both quantity and quality.

The existing development is 100% impermeable, and it is not proposed at this time, given the proposed usage of the development, to incorporate any permeable surfaces within the development design. The development usage is generally very hard wearing on surface construction, and the use of permeable surfaces would likely increase the likelihood of blockages and increase surface maintenance requirements making this an unsuitable SUDS system for this development proposal. It is currently proposed to utilize proprietary mechanical SUDS features within the development for the removal of solids and silts from hard standing vehicle storage areas, such as a downstream defender. Flows would then be routed through filter trenches prior to flow restriction and discharge.

Ideally discharge flows from the development should be restricted to greenfield run off rates. In the instances of redevelopment of brownfield development areas it is sometimes extremely difficult to provide suitable attenuation storage for the restricted flows within confined site boundaries to accommodate greenfield run off rates, therefore a significant betterment is generally sought from the existing condition. We would propose a target 75% betterment to the existing brownfield flows for the proposed development prior to discharge.

Flows attenuated by the restriction noted above are proposed to be held within a below ground cellular storage structure within the development boundary beneath external vehicle storage areas. The attenuation will be suitably sized to accommodate storm up to the 1 in 100 year event with an allowance of 30% for climate change in accordance with current best practice and flood prevention guidance without exceedance.

5.3.5 Foul Drainage

Review of the drainage network plans shows an existing foul sewer to the West of the development within Rowdell Road, and subject to confirmation by CCTV report, it is assumed that the foul drainage from the existing development discharges to this sewer. It is not currently known however if this discharge is by gravity, or is pumped within the development boundary to the sewer.

Foul Drainage for the proposed development will be required for all internal covered areas and is proposed to match the existing situation by discharging to the foul sewer within Rowdell Road. Depending on confirmation of the existing system, the proposed foul drainage within the development may require to be pumped to the discharge point. If a pumped system is required, note should be taken to the usage of the development and potential for oils and fuels to leak from vehicles, with protective measures put in place regarding the pumping of the contaminants, or removal prior to pumping.

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It has been confirmed that no screening of the run off from internal vehicle inspection areas is required prior to discharge.

5.4 Scope of Service

5.4.1 Contractor Designed Elements

The following elements are to be designed by the Contractor and their sub-contractors and do not therefore fall under our design scope of works:

 Piling  Precast Concrete Stairs  Steelwork Connections  Cladding & Fixings  Curtain Walling & Fixings  Glazing & Fixings  Balustrades and Protective barriers  Roof Purlins  Temporary Works

5.5 Materials

The materials principally used in the design of the building are steel and concrete.

The table below summarises the material specifications for the project:

Material Primary Use Specification Structural Steelwork Grade S355 Steel Reinforcement Bars Grade B500

Foundations, Retaining Walls and Slabs C32/40 Concrete Composite Slabs C32/40

5.6 Design Codes of Practice

All structural design has been carried out in accordance to the list of codes provided in the following table:

Element Standard Description

Loading BS 6399-1 Loadings for buildings – Part 1: Code of practice for dead and imposed loads Wind loading BS6399-2 Loadings for buildings – Part 2: Code of practice for wind loads Loading BS 6399-3 Loadings for buildings – Part 3: Code of practice for imposed roof loads

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Concrete BS 8110-1 Structural use of concrete – Part 1: Code of practice for design and construction Structural use of steelwork in building – Part 1: Code of practice for design – Steel BS 5950-1 Rolled and welded sections Structural use of steelwork in building – Part 3: Design in composite construction Composite BS 5950-3.1 – Section 3.1 Code of practice for design of simple and continuous composite beams Code of practice for the use of masonry – Part 1: Structural use of unreinforced Masonry BS 5628-1 masonry

5.7 Loadings

5.7.1 Imposed Loads - Roof

Refer to BS BS 6399-3 Loadings for buildings – Part 3: code of practice for imposed roof loads.

Standard Snow 0.40 kN/m2 General Access 0.60 kN/m2

5.7.2 Imposed Loads – Floors

Refer to BS BS 6399-1 Loadings for buildings – Part 1: code of practice for dead and imposed loads

Offices 2.50 kN/m2 Partitions 0.50 kN/m2 Total 3.00 kN/m2

Parking bays 2.50 kN/m2 Running aisles 10.00 kN/m2

5.7.3 Imposed Loads – Wind

Refer to BS BS 6399-2 Loadings for buildings – Part 2: code of practice for wind loads

Basic wind speed, Vb 20.0 m/s Location Sit in Town

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6.0 Sustainability

6.1 Draft Route to Compliance

6.1.1 Part L2A 2013 Building Regulations Compliance

The project is required to meet Part L2A 2013 Regulations for new buildings in England.

The CO2 emissions associated with the annual energy consumption will therefore be assessed in accordance with Building Regulations Part L2A 2013 using the National Calculation Method for Dynamic Simulation Modelling (DSM).

A draft BRUKL output document has also been prepared and is in K.

6.1.2 The London Plan

The current Greater London Authority (GLA) requires that commercial developments should be 35% below Part L2A 2013. If the carbon savings are not fully achieved on site, the annual remaining carbon emissions to achieve the 35% is required to be paid in the form of a carbon levy to the local authority at a current rate of £60 per tonne over the assumed lifetime of the plant (30 years).

The London Plan is due to be updated, this will increase the carbon reduction requirements to a minimum of 35% to be achieved on site with a shortfall to an overall reduction of 100% payable to the to the local authority.

A full energy strategy report is required to be submitted to planning in line with the London Plans specific requirements and detail the estimated savings.

6.1.3 Ealing Local Planning Authority

The local planning authority requires the requirements of the London Plan to be met, and in addition requires the following:

6.1.4 MPS Targets

The Met police require all new projects to carry out an energy strategy, this is in line with the requirements of the London Plan. It also requires an overall 35% carbon reduction below Part L in line with the London Plan to be achieved, with the full 35% reduction achieved on site where technically feasible.

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6.1.5 Compliance Review

A compliance review has been undertaken using the current design proposals to ascertain the likely route to compliance required prior to the completion of the full energy strategy reporting.

Figure 1: IES Model Image

The following design parameters have been assumed for the initial assessment:

System Performance Parameters

Floor: U-Value of 0.18W/m2K External Walls: U-Value of 0.20W/m2K Fabric Roof: U-Value of 0.15W/m2K Personnel Doors: 1.8W/m2K

Windows with a U-Value of 1.6W/m2K Glazing Visible Light Transmittance of 71%, g-value 0.399

Air Permeability 7m3hr/m2 @ 50Pa, To be tested and certified Energy Efficient LED Lighting assumed generally: 2 Artificial Lighting  2W/m /100lux  Presence Detection (Auto On/Off) applied to office areas, toilets and locker rooms. Manual Switching to Forensics and car park areas. Extract/specialist extract to highlighted forensic vehicle inspection areas. Ventilation Supply and Extract AHU to office accommodation, specific fan power 1.2W/l/s Extract ventilation to toilets, specific fan power 0.3W/l/s

Extract radiant heating to highlighted forensic vehicle inspection areas Heating Air Source Heat Pump providing heating to office accommodation SCoP 3.5

Cooling Cooling provided to office accommodation via Air Source Heat Pump SEER 3.7 Power Factor Correction >0.95 Domestic Hot Water Electric Instantaneous Hot Water, no storage

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Low Carbon Technology Roof Mounted PV Panels, orientated to face South at a 300 mounting angle

The baseline design parameters give the following results:

Modelling Option Target Emission Rate Building Emission Rate % Reduction

Baseline (30m2 PV) 15.4 15.4 0% PV – 425m2 15.4 9.9 35.7%

The baseline model does not currently pass Part L without the inclusion of some PV panels, a minimum of 30m2 is required in order to pass the requirements of Part L.

However, in order to meet the requirements of the London Plan and the Met Police a 35% reduction should be attempted to be achieved on site. This would require 425m2 of PV panels to be included.

There is a potential option if the area of PV panels cannot be achieved on site that a smaller area could be included with the remaining carbon emission reduction being made up through a carbon levy.

6.2 Sustainable Design Checklist

We have completed the MPS’ Sustainable Design Checklist and it is provided within appendix M.

This feasibility study report is RIBA 1, and it is noted that items within the Sustainable Design Checklist are grouped within RIBA 1-2. Whilst we have completed the checklist for all stages, it should be noted that as it stands we have only developed this project to RIBA 1.

6.3 BREEAM Preliminary Pre-Assessment

6.3.1 BREEAM Assessor Comments

A draft preassessment has been completed by David Bennett, a BREEAM Assessor with Gleeds Sustainability. A copy of the full preliminary pre-assessment is provided in appendix N.

The redevelopment requires a BREEAM rating of 'Very Good' with a minimum score of 55%. Presently Option 5 can achieve the required rating with a margin of 7.69%. BREEAM Minimum Standards have been achieved. Please note 'Early Actions' required during RIBA Stage 1 & 2 for targeted credits.

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6.3.2 Credit Summary

The table below contains the credit summary for Option 5:

Total Credit Awarded Targeted Possible Not Sought Section Weighting Credits Value % Score % Score % Score % Score

Management 21 11.00 0.52 0.00 7.33 3.67 0.00

Health & Wellbeing 17 14.00 0.82 0.00 10.71 2.47 0.82

Energy 23 16.00 0.70 0.00 9.74 3.48 4.17

Transport 12 10.00 0.83 0.00 3.33 1.67 5.00

Water 9 7.00 0.78 0.00 4.67 0.78 1.56

Materials 14 15.00 1.07 0.00 10.71 2.14 1.07

Waste 10 6.00 0.60 0.00 4.20 1.80 0.00

Land use & Ecology 13 13.00 1.00 0.00 4.00 9.00 0.00

Pollution 12 8.00 0.67 0.00 6.00 2.67 0.00

Innovation 10 1.00 0.10 0.00 2.00 1.00 17.0

Total 141 101 0.00 62.69 28.67 29.62

6.4 BREEAM 2018 New Construction Early Actions

The following section details the requirements to satisfy the BREEAM 2018 New Construction Early Actions. The report sets out key actions that are required to take place up to and including RIBA Stages 1 and 2.

We would advocate that as many of the below early stage actions are completed as possible to maximise the BREEAM score. Missing these opportunities now can result in the assessment being handicapped, as the credits cannot be retrospectively secured later. Early stage credits also tend to be relatively inexpensive to achieve – and can make a significant impact on the sustainability of a building.

The table below highlights an overview of each of the early action credits along with the likely information that will be provided for compliance. A detailed list of these BREEAM early actions is provided further in this report.

Please note this document is not a comprehensive list of BREEAM requirements. But serves to detail the early credits and actions that will need to be completed / considered to secure the targeted BREEAM rating.

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Ref Credit RIBA Responsibility Credit Overview Expected / likely evidence Stage submission: Man 01 BREEAM Stage 1/2 Not presently Appointment of a BREEAM AP to Stage 1 and 2 BREEAM Accredited targeted facilitate the targeting of the Accredited Professional reports / Professional associated BREEAM Rating. pre-assessment report (Design) Tra 01 Travel Plan Stage 1/2 TBA Consultant to be appointed to A copy of the travel plan for the produce a travel plan. site or building Mat 06 Material Stage 1/2 Not presently A dedicated Material efficiency Technical note from lead designer Efficiency targeted review will need to be undertaken and recorded for BREEAM purposes. LE02- Ecological Stage 1/2 Not presently Appoint an ecologist to complete Report from a suitably qualified 04 Enhancement targeted an early ecological review and ecologist survey of the proposed site. Man 01 Project Stage 2 Gleeds PM/ During the relevant design team Roles and responsibilities matrix Delivery Client meetings, the roles and Evidence of suggestions made Planning responsibilities of each team and their adoption in the design member will need to be discussed and agreed. Man 01 Stakeholder Stage 2 Gleeds PM/ A consultation plan will need to be Consultation Plan Consultation Client prepared which set out who and Correspondence on feedback when interested parties will be consulted on the design. Man 02 Life Cycle Stage 2 Not presently A Life Cycle Costing Consultant Elemental life cycle cost (LCC) Costing targeted will need to be appointed to with confirmation of the undertake the Life Cycle Costing recommendations report and set out clear recommendations on how the analysis has influenced the design. Hea 02 Indoor Air Stage 2 M&E Production of an Indoor Air Indoor Air Quality Plan Report Quality Plan Quality Plan that can be implemented throughout the project. Hea 06 Security - Stage 2 Gleeds PM/ A security officer will need to be Security review by the security Secure by Client consulted for their security advice specialist in the form of meeting Design and adopted into the design. minutes, email or a letter. Consultation Ene 01 Prediction of Stage 2 M&E Design workshop focusing on Meeting minutes and potentially: Operational operational energy performance. An early SBEM / BRUKL report Energy for the assessed building Consumption Ene 04 Passive Stage 2 Not presently M&E designer to undertake and Passive design opportunities Design targeted review the passive design technical note from M&E designer Analysis analysis and provide the formal report. Ene 04 LZC Stage 2 M&E M&E designer to undertake and LZC feasibility technical note from Feasibility review LZC feasibility study and M&E designer provide the formal report. Mat 01 Life Cycle Stage 2 Gleeds Life Cycle Assessment to be The production of a dedicated Assessment BREEAM/ undertaken at RIBA Stage 2 LCA report Architect Mat 03 Enabling Stage 2 Gleeds A sustainable procurement plan The production of a dedicated Sustainable BREEAM/ must be put in place by the end of materials / sustainable Procurement Architect RIBA Stage 2. procurement policy Wst 01 Pre- Stage 2 TBA Where demolition works will be Pre-demolition Audit Report demolition undertaken a Pre-demolition, Audit audit will need to be completed. Wst 05 Adaptation to Stage 2 Not presently Completion of an adaption to Climate change adaptation report Climate targeted climate change report with Change associated recommendations. Wst 06 Functional Stage 2 Architect Completion of a functional Functional adaptability report Adaptability adaptability report with associated recommendations.

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6.5 Details of Early Action Credits – RIBA Stage 1-2

6.5.1 MAN 01: Sustainability Champion (Design)

This is not presently targeted. A BREEAM Accredited Professional (AP) must be appointed to facilitate the setting and achievement of the target BREEAM rating for the project.

The target rating and minimum standards must be formally agreed between the client and design/project team no later than the Concept Design stage (RIBA Stage 2 or equivalent).

6.5.2 TRA 05: Travel Plan

During the feasibility and design stages, develop a travel plan based on a site-specific travel assessment or statement.

The site-specific travel assessment or statement covers as a minimum:

 Existing travel patterns and opinions of existing building or site users towards cycling and walking, identifying constraints and opportunities, if relevant  Travel patterns and transport impact of future building users  Current local environment for walkers and cyclists (accounting for visitors who may be accompanied by young children)  Reporting of the number and type of existing accessible amenities, see Table 7.1 below, within 500m of the site  Disabled access (accounting for varying levels of disability and visual impairment)  Calculation of the existing public transport Accessibility Index (AI), see Methodology on the next page  Current facilities for cyclists

The travel plan includes proposals to increase or improve sustainable modes of transport and movement of people and goods during the building's operation and use

Where the occupier is known, they are actively involved within the development of the travel plan.

6.5.3 MAT 06: Material Efficiency Review

This is not presently targeted. The project team needs to start to carry out a review as part of the feasibility stage (i.e. RIBA Stage 1) to identify the following, materials options in line with “WRAP” guidance.

 Design opportunities to reuse or recover materials already on site  Design opportunities for off-site construction  Design opportunities for Material Optimisation  Design opportunities for Waste Efficiency Procurement  Design opportunities for Deconstruction and Reuse

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Examples of specific issues that could be reviewed include:

 Can existing elements be reused, preferably on-site  Can materials with a high recycled content be used  Consider the waste hierarchy for waste materials removed as part of the demolition  Pipe work: use of materials with a high recycled content  Ventilation systems & ductwork: consider changes to design and minimise the need for the systems, position of AHU’s closer to ventilated spaces to minimise length in ductwork  Floor coverings: can existing floor coverings be reused on or off-site  Partitions and ceilings: can existing ceilings and partitions be reused? If not, consider adjusting sizes of partitions to minimise off cuts of materials

Alternatively, the BRE are also advocating that following Parts 1 and 2 of the BS 8895 - Designing for material efficiency in building projects.

Note the above will also need to be carried out / updated at the following stages of the development:

 Concept Design (RIBA Stage 2)  Developed Design (RIBA Stage 3)  Technical Design (RIBA Stage 4)  Construction (RIBA Stage 5)

6.5.4 LE 02: Ecological Enhancement

This is not presently targeted.

Survey and evaluation:

An appropriate SQE is appointed at a project stage that ensures early involvement in site configuration and, where necessary, can influence strategic planning decisions.

Prior to the completion of the preparation and brief, an appropriate level of survey and evaluation has been carried out to determine the ecological baseline of the site, taking account of the zone of influence to establish:

 Current and potential ecological value and condition of the site, and related areas within the zone of influence.  Direct and indirect risks to current ecological value  Capacity and feasibility for enhancement of the ecological value of the site and, where relevant, areas within the zone of influence.  Data are collated and shared with project team to inform the site preparation, design or construction works.

Determining the ecological outcomes for the site:

During Concept Design, the project team liaise and collaborate with the relevant stakeholders (including the ecologist) to identify and consider ecological outcome for the sites for the project.

When determining the ecological outcome for the site, this must involve the identification, appraisal and selection of specific solutions and measures sufficiently early to influence key project planning decisions.

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This must be done in accordance with the following hierarchy of action:

 Avoidance  Protection  Reduction or limitation of negative impacts  On site compensation and,  Enhancement, considering the capacity and feasibility within the site, or where viable, off-site.

Following this the optimal ecological outcome for the site is selected after liaising with representative stakeholders and the project team.

Suitably Qualified Ecologist (SQE)

An individual achieving all the following items can be 'suitably qualified' for the purposes of compliance with BREEAM:

 Holds a degree or equivalent qualification (e.g. N/SVQ level 5) in ecology or a related subject.  Is a practising ecologist, with a minimum of three years relevant experience (within the last five years).  Is covered by a professional code of conduct and subject to peer review. I.e. IEMA etc.

6.5.5 LE 03: Ecological Enhancement

This is not presently targeted.

Planning, liaison, implementation and data:

Achievement of the LE02 criteria plus:

Roles and responsibilities have been clearly defined, allocated and implemented to support successful delivery of project outcomes at an early enough stage to influence the concept design or design brief.

Site preparation and construction works have been planned for and are implemented at an early project stage to optimise benefits and outputs.

The project team liaising and collaborating with representative stakeholders, taking into consideration data collated and shared, have implemented solutions, and measures have been selected during site preparation and construction works.

Managing negative impacts of the project:

Negative impacts from site preparation and construction works have been managed according to the hierarchy actions as mentioned in LE02, and either:

 No overall loss of ecological value has occurred which will achieve two credits OR;  The loss of ecological value has been limited as far as possible which will achieve one credit

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6.5.6 LE 04: Ecological Enhancement

This is not presently targeted.

Identifying and understanding the risks and opportunities for the project:

Achievement of the LE03 criteria plus:

The client or contractor confirms compliance is monitored against all relevant UK, EU or international legislation relating to the ecology of the site.

Liaison, implementation and data collation:

The project team liaising and collaborating with representative stakeholders, taking into consideration data collated and shared, have implemented the solutions and measures selected in a way that enhances ecological value in the following order:

 On site, and where this is not feasible,  Off site within the zone of influence.

Enhancement of ecology:

The credits are based on a scale 1-3 credits where the calculation in the change of ecological value is confirmed via the methodology set out in GN36 – assessor to circulate the GN.

At the time of writing the BRE have not defined exactly how the credits match up to the change in ecological value therefore it is expected that the enhancement is maximised by the ecologist as set out in GN36.

Overall note: The Ecology credits are now much more fluid and can be open to interpretation; therefore, it is advised that the Ecologist is brought on as another ‘part time’ consultant to advise throughout the project. Alternatively, the Ecologist could produce a report, but then a nominated team member will need to keep a tab on the recommendations, enhance and improvements via implementation.

6.6 Details of Early Action Credits – RIBA Stage 2

6.6.1 MAN 01: Stakeholder Consultation (Project Delivery)

Prior to completion of the Concept Design (RIBA Stage 2 or equivalent), the client, architect, building services engineer and the project manager have met to identify and define their roles, responsibilities and contributions for each of the key phases of project delivery:

 Concept Design  Developed Design  Construction  Commissioning and Handover  In-Use occupation

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In defining the roles and responsibilities for each key phase of the project, the following must be considered:

 End user requirements  Aims of the design and design strategy  Installation and construction requirements or limitations  Occupiers' budget and technical expertise in maintaining any proposed systems  Maintainability and adaptability of the proposals  Operational energy considerations  Requirements to produce project and end user documentation  Requirements for commissioning, training and aftercare support.

A “roles and responsibilities” matrix should be produced to evidence the above.

The project team must demonstrate how the project delivery stakeholder contributions and the outcomes of the consultation process have influenced or changed the Initial Project Brief, including if appropriate, the Project Execution Plan, Communication Strategy, and the Concept Design.

For example, to evidence this, copies of meeting minutes could be provided, showing suggestions and/or recommendations, along with Concept Design drawings or reports which clearly show the suggestion or recommendations have been adopted.

6.6.2 MAN 01: Stakeholder Consultation (Third Party)

Prior to completion of the Concept Design stage, all relevant third-party stakeholders have been consulted by the design team and this covers the minimum consultation content.

The minimum consultation content of the consultation plan will be dependent on the building but would typically include the following:

 Functionality, build quality and impact (including aesthetics)  Provision of appropriate internal and external facilities (for future building occupants and visitors/users)  Management and operational implications  Maintenance resources implications  Impacts on the local community, e.g. local traffic/transport impact  Opportunities for shared use of facilities and infrastructure with the community/appropriate stakeholders, if relevant/appropriate to building type  Compliance with statutory (national/local) consultation requirements  Energy use and sustainability measures  Implementing principles and processes that deliver an inclusive and accessible design

The project team must demonstrate how the stakeholder contributions and outcomes of the consultation exercise have influenced or changed the Initial Project Brief and Concept Design.

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6.6.3 MAN 02: Lifecycle Cost and Service Life Planning

This is not presently targeted. An elemental life cycle cost (LCC) analysis has been carried out, at Process Stage 2 (equivalent to Concept Design - RIBA Stage 2) together with any design option appraisals in line with 'Standardised method of life cycle costing for construction procurement' PD 156865:2008.

The LCC analysis shows:

 An outline LCC plan for the project based on the building's basic structure and envelope, appraising a range of options and based on multiple cash flow scenarios e.g. 20, 30, 50+ years;  The servicing strategy for the project outlining services component over a 15-year period, in the form of an 'elemental LCC Plan'.

Following the analysis, the project team must provide a letter confirming how the LCC study influenced the design/specification, to minimise life cycle costs and to maximise critical value.

6.6.4 HEA 02: Indoor Air Quality (IAQ) Plan

A site-specific indoor air quality plan has been produced and will set out recommendations for implementation. The plan must be produced no later than the end of Concept Design.

The objective of the plan is to facilitate a process that leads to design, specification and installation decisions and actions that minimise indoor air pollution during occupation of the building. The indoor air quality plan must consider the following:

 Removal of contaminant sources  Dilution and control of contaminant sources: o Where present, consideration is given to the air quality requirements of specialist areas such as laboratories  Procedures for pre-occupancy flush out  Third party testing and analysis  Maintaining good indoor air quality in-use.

6.6.5 HEA 06: Security

A suitably qualified security specialist conducts an evidence-based Security Needs Assessment during or prior to Concept Design (RIBA Stage 2 or equivalent).

A suitably qualified security specialist develops a set of recommendations or solutions during or prior to Concept Design (RIBA Stage 2 or equivalent). These recommendations or solutions aim to ensure that the design of buildings, public and private car parks and public or amenity space are planned, designed and specified to address the issues identified in the preceding Security Needs Assessment.

Note: a suitably qualified security specialist is someone who meets the following credentials:

1. Crime Prevention Design Advisors (CPDA) or Architectural Liaison Officers (ALO), Counter Terrorism Security Advisor (CTSA); OR 2. A specialist registered with a BREEAM-recognised third party accreditation scheme for security specialists; OR; 3. A practising security consultant that meets the following requirements:

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 Minimum of three years relevant experience within the last five years. This experience must clearly demonstrate a practical understanding of factors affecting security in relation to construction and the built environment, relevant to the type and scale of the project being undertaken.  Hold a suitable qualification relevant to security.  Maintains (full) membership to a relevant professional body or accreditation scheme that meets the following: i. Has a professional code of conduct, to which members must adhere; and ii. Ongoing membership is subject to peer review.

Note there is the potential to achieve an exemplary performance credit, where the security officer uses a compliant risk- based security rating scheme. The performance of which it will need to be assessed against SABRE (currently the only compliant scheme) which will be confirmed by an independent party who will carry out the assessment and verification. This will need to be checked with the security specialist once appointed.

6.6.6 ENE 01: Reduction of Carbon Dioxide Emissions

There are four credits available for carrying out a dedicated energy review and additional modelling to determine the likely prediction of operational energy consumption.

To secure these credits prior to completion of the Concept Design, relevant members of the design team hold a preliminary design workshop focusing on operational energy performance. Additional modelling would then need to occur with a commitment undertake an ‘energy risk’ assessment throughout the construction and commissioning process.

6.6.7 ENE 04: Passive Design

This is not presently targeted. The project team carries out an analysis of the proposed building design/development to influence decisions made during Concept Design stage (RIBA Stage 2 or equivalent) and identify opportunities for the implementation of passive design solutions that reduce demands for energy consuming building services.

As a minimum, the passive design analysis should cover:

 Site location  Site weather  Microclimate  Building layout  Building orientation  Building form  Building fabric  Thermal mass or other fabric thermal storage  Building occupancy type  Daylighting strategy  Ventilation strategy  Adaptation to climate change.

The building uses passive design measures to reduce the total heating, cooling, mechanical ventilation and lighting loads and energy consumption in line with the findings of the passive design analysis and the analysis demonstrate the reduced total energy demand and the CO2 emissions.

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6.6.8 ENE 04: Low Carbon Design

A feasibility study has been carried out by the completion of the Concept Design stage (RIBA Stage 2 or equivalent) by an energy specialist to establish the most appropriate recognised local (on-site or near-site) low or zero carbon (LZC) energy source(s) for the building/development.

As a minimum, the LZC should cover:

 Energy generated from LZC energy source per year  Carbon dioxide savings from LZC energy source per year  Life cycle cost of the potential specification, accounting for payback  Local planning criteria, including land use and noise  Feasibility of exporting heat/electricity from the system  Any available grants  All technologies appropriate to the site and energy demand of the development.  Reasons for excluding other technologies  And if appropriate: i. The building is connected to an existing local community CHP system or ii. The building is connected to an existing source of waste heat or power OR iii. A building or site CHP system is specified with the potential to export excess heat or power via a local community energy scheme or iv. A source of waste heat or power is specified with the potential to export excess heat or power via a local community energy scheme  Energy storage.

A local LZC technology/technologies has/have been specified for the building/development in line with the recommendations of this feasibility study and this method of supply results in a reduction in regulated carbon dioxide (CO2) emissions.

6.6.9 MAT 01: Life Cycle Assessment

The below summarises what will need to be completed to maximise the credits under the LCA review at RIBA Stage 2:

Superstructure option appraisal during Concept Design (up to six credits available)

During Concept Design, identify opportunities for reducing environmental impacts as follows:

 Carry out building LCA options appraisal of 2 to 4 significantly different superstructure design options  Use a building LCA tool that is recognised by BREEAM i.e. One Click LCA etc.  Ensure each design option, fulfils the same functional requirements specified by the client and all statutory requirements  Integrate the LCA options appraisal activity within the wider design decision-making process. Record this in an options appraisal summary document.

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One credit – Substructure and hard landscaping options appraisal during Concept Design (all building types)

During Concept Design identify opportunities for reducing environmental impacts as follows:

 Carry out building LCA options appraisal of a combined total of at least six significantly different substructure or hard landscaping design options (at least two shall be substructure and at least two shall be hard landscaping).  Using a building LCA tool that is recognised by BREEAM (as per the above)

One credit – Core building services options appraisal during Concept Design (all building types)

During Concept Design identify opportunities for reducing environmental impacts as follows:

 Carry out building LCA options appraisal of at least 3 significantly different core building services design options.  Using a building LCA tool that is recognised by BREEAM (as per the above).

One credit – LCA and LCC alignment (all building types)

Achieve Elemental Man 02 LCC plan and Component Level LCC options appraisal credits

Integrate the aligned LCA and LCC options appraisal activity within the wider design decision-making process. Record this in an options appraisal summary document including the relevant cost information from the ‘elemental LCC plan’ and ‘Component level LCC option appraisal’.

One credit – Third party verification (all building types)

 A suitably qualified third party* carries out the building LCAs or produces a report verifying the building LCAs accurately represent the designs under consideration during Concept Design  For each LCA option, itemise the findings of the verification checks made by the suitably qualified third party in the report  Include details of the suitably qualified third party's relevant skills and experience and a declaration of their third-party independence from the project client and design team in the report.

Suitably qualified third party is an individual who:

 Is a third party  Has received training on using the building LCA tool that is recognised by the tool supplier and has passed the associated tests or exams (if any).  Has completed building LCA for at least three projects for paying customers in the last two years.  Can interpret construction documentation (drawings, specifications, schedules etc.), which may be evidenced by a suitable construction related qualification or relevant experience.

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6.6.10 MAT 03: Responsible Sourcing of Construction Products

A sustainable procurement plan must be used by the design team to guide specification towards sustainable construction products. The plan must:

 Be in place before the end of the Concept Design.  Include sustainability aims, objectives and strategic targets to guide procurement activities. Note:  targets do not need to be achieved for the credit to be awarded but justification must be provided for targets that are not achieved.  Include a requirement for assessing the potential to procure construction products locally. There must be a policy to procure construction products locally where possible.  Include details of procedures in place to check and verify the effective implementation of the sustainable procurement plan.

In addition, if the plan is applied to several sites or adopted at an organisational level it must:

 Identify the risks and opportunities of procurement against a broad range of social, environmental and economic issues following the process set out in BS ISO 20400:2017.

6.6.11 WST 01: Pre-Demolition Audit

Complete a pre-demolition audit of any existing buildings, structures or hard surfaces being considered for demolition. This must be used to determine whether refurbishment or reuse is feasible and, in the case of demolition, to maximise the recovery of material for subsequent high grade or value applications.

The audit must cover meet the following:

 Be carried out at Concept Design stage (RIBA Stage 2) by a competent person* prior to strip-out or demolition works  Guide the design, consider materials for reuse and set targets for waste management  Engage all contractors in the process of maximising high-grade reuse and recycling opportunities  Compare actual waste arisings and waste management routes used with those forecasts and  investigate significant deviations from planned targets.  Set out the following: i. Identification and quantification of the key materials where present ii. Potential applications and any related issues for the reuse and recycling of the key materials in accordance with the waste hierarchy iii. Opportunities for reuse and recycling within the same development iv. Identification of local reprocesses or recyclers for recycling of materials v. Identification of overall recycling targets where appropriate vi. Identification of reuse targets where appropriate vii. Identification of overall landfill diversion rate for all key materials.

*Pre-demolition audit competent person

An individual who has appropriate knowledge of buildings, waste and options for reuse and recycling of different waste streams. Ideally this would be a demolition contractor but could also be the main contractor.

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6.6.12 WST 05: Adaptation to Climate Change

This is not presently targeted. Conduct a climate change adaptation strategy appraisal for structural and fabric resilience by the end of Concept Design (RIBA Stage 2 or equivalent), in accordance with the following approach:

Carry out a systematic (structural and fabric resilience specific) risk assessment to identify and evaluate the impact on the building over its projected life cycle from expected extreme weather conditions arising from climate change and, where feasible, mitigate against these impacts.

Hazards target by this credit include but are not limited to:

 Solar radiation  Temperature variation  Water/moisture  Wind  Precipitation e.g. rain and snow  Extreme weather conditions: high wind speeds, flooding, driving rain, snow, rainwater ponding  Subsidence/ground movement.

The assessment should cover the following stages:

 Hazard identification  Hazard assessment  Risk estimation  Risk evaluation  Risk management.

6.6.13 WST 06: Functional Adaptability

A building-specific functional adaptation strategy study has been undertaken by the client and design team by Concept Design (RIBA Stage 2 or equivalent), which includes recommendations for measures to be incorporated to facilitate future adaptation.

The functional adaptability study should consider:

 Feasibility: The likelihood to contain multiple or alternative building uses, area functions and different tenancies over the expected life cycle, e.g. related to the structural design of the building.  Accessibility: Design aspects that facilitate the replacement of all major plant within the life of the building, e.g. panels in floors and walls that can be removed without affecting the structure, providing lifting beams and hoists. Accessibility also involves access to local services, such as local power, data infrastructure etc.  Versatility: The degree of adaptability of the internal environment to accommodate changes in working practices.  Adaptability: The potential of the building ventilation strategy to adapt to future building occupant needs and climatic scenarios.  Convertibility: The degree of adaptability of the internal physical space and external shell to accommodate changes of in-use.  Expandability: The potential for the building to be extended, horizontally or vertically.  'Refurbishment potential': The potential for major refurbishment, including replacing the façade.

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6.7 Travel Assessment & Sustainable Transport Measures

6.7.1 TRA 01: Travel Plan

During the feasibility and design stages, develop a travel plan based on a site-specific travel assessment or statement.

The site-specific travel assessment or statement covers as a minimum:

 Existing travel patterns and opinions of existing building or site users towards cycling and walking, identifying constraints and opportunities, if relevant.  Travel patterns and transport impact of future building users.  Current local environment for walkers and cyclists (accounting for visitors who may be accompanied by young children).  Reporting of the number and type of existing accessible amenities i.e. cash point, post box, food outlets etc, within 500m of the site.  Disabled access (accounting for varying levels of disability and visual impairment).  Calculation of the existing public transport Accessibility Index (AI).  Current facilities for cyclists.

The travel plan includes proposals to increase or improve sustainable modes of transport and movement of people and goods during the building's operation and use.

If the occupier is known, involve them in the development of the travel plan.

Demonstrate that the travel plan will be implemented post construction and be supported by the building's management in operation.

6.7.2 TRA 02: Sustainable Transport Measures

Tra 02 relies on the completion of Travel Plan and confirmation of the Accessibility Index. It will also require more interactive consultation with the Transport Consultant as the BREEAM requirements are more prescriptive, as briefly set out below:

Assessment Public Transport Measures Feasible Option Y/N

1 1. The existing AI calculated in Tra 01 achieves the following: AI 17.44  ≥ 8 for all other building types – 1 point

2 2. Demonstrate an increase over the existing Accessibility Index through negotiation with local bus, train or tram companies to increase the frequency of the local N service provision for the development; OR

3.Demonstrate an increase over the existing Accessibility Index. This could be through provision of a diverted bus route, a new or enhanced bus stop, or other similar solutions. N OR

4. Provide a dedicated service, such as a bus route or service N

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Assessment Public Transport Measures Feasible Option Y/N

3 5. Provide a public transport information system in a publicly accessible area, to allow building users access to up-to-date information on the available public transport and transport infrastructure. This N may include signposting to public transport, cycling, walking infrastructure or local amenities.

4 6. Provide electric recharging stations of a minimum of 3kW for at least 10% of the total car parking N capacity for the development.

7. Set up a car sharing group or facility to facilitate and encourage building users to car share. 8. Raise awareness of the sharing scheme with marketing and communication materials. 9. Provide priority spaces for car sharers for at least 5% of the total car parking capacity for the N development. 10. Locate priority parking spaces nearest the development entrance used by the sharing scheme participants.

6 11. During preparation of the brief, the design team consults with the local authority (LA) on the state of the local cycling network and public accessible pedestrian routes, to focus on whichever the LA deems most relevant to the project, and how to improve it. N 12. Agree and implement one proposition chosen with the local authority. The proposition supported by the development is additional to existing local plans and has a significant impact on the local cycling network or on pedestrian routes open to the public.

7 Install compliant cycle storage (refer to 7.73) spaces as follows: Building is a ‘Commercial Office/Industrial) and the AI is ≥ 8 (Compliant cycle spaces reduced by 50%) N  1 space per every 20 staff

8 14. The minimum amount of cycle storage has been achieved, plus; 15. Provide at least two compliant cyclists' facilities (refer to 7.7.4) for the building users, for the scope of each compliant facility:  Showers N  Changing facilities  Lockers  Drying spaces. 9 Existing amenities:

16. At least three existing accessible amenities are present (refer to 7.7.5) Y – 1  Outdoor space (Belvue Park) point  Leisure facility (PureGym)  Postal facility (Rowell Road) 10 Enhanced amenities: 17. Ensure a minimum of one new accessible amenity3 is created (refer to 7.7.5) N 18. Ensure more than one new accessible amenity3 is created (refer to 7.7.5)

11 19. Implement one site-specific improvement measure, not covered by the options already listed in this N issue, in line with the recommendations of the travel plan. Submit this for review by BRE.

Once the assessment options are confirmed as viable / not viable by the transport consultant along with the Accessibility Index the BREEAM assessor will need to be consulted to advise on the likely amount of credits that will be achieved.

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6.7.3 Compliant Cycle Storage Spaces

Compliant cycle storage spaces are defined as those meeting the following:

 Cycles can be secured within spaces in racks with overhead covering. The cycle racks are set in or fixed to a permanent structure (building or hardstanding) or alternatively, may be in a locked structure fixed to, or part of, a permanent structure with appropriate surveillance.  The distance between each cycle rack, and the cycle racks and other obstructions, e.g. a wall, allows appropriate access to the cycle storage space for easy storage and access to bikes.  The storage facility or entrance to the facility is in a prominent site location visible to potential users from either an occupied building or a main access to a building.  The cycle storage facility has adequate lighting; demonstrated by meeting the lighting criteria in Hea 01 – and as included in the M&E specification.  The lighting must be controlled to avoid out-of-hours use and operation during daylight hours, where there is sufficient daylight in or around the facility.

6.7.4 Compliant Cycle Facilities

Compliant changing facilities

These are defined as those that meet the following:

 Appropriately sized for the likely or required number of users. The assessor should use their judgement to determine whether the changing area is appropriately sized given the number of cycle storage spaces or showers provided  Account for privacy to allow cyclists of either gender to change in private  Changing areas must include adequate space and facilities to hang or store clothing and equipment while changing or showering, e.g. bench seat or hooks  Toilet or shower cubicles cannot be counted as compliant changing facilities

Compliant drying spaces:

A compliant drying space is defined as a space that is specifically designed and designated for this purpose. It should be provided with suitable finishes, adequate heating and ventilation and the facility to hang wet clothes with sufficient air movement around them to dry effectively.

Examples of non-compliant spaces:

 Plant rooms: these are not specifically designed for the purpose and their use as a drying space may create a health and safety hazard;  Coat hooks in cloakrooms or staff changing areas: these are not specifically designed and are unlikely to provide adequate ventilation or allow sufficient air movement to dry clothing effectively.

Compliant lockers:

Compliant lockers are defined as those meeting the following:

 The number of lockers is at least equal to the number of cycle spaces required  Lockers are in or adjacent to compliant changing rooms, where provided  The lockers are sized appropriately for the storage of a cyclists’ equipment.

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Compliant showers:

Compliant showers are defined as those meeting the following:

 Provision of one shower for every 10 cycle storage spaces, subject to a minimum provision of one shower  Any building providing eight showers or more complies regardless of the number of cycle storage spaces provided  Both male and female users must be catered for, either separate showers within shared gender-specific facilities (required provision split 50-50) or single  The showers do not need to be dedicated to cyclists and can be those shared with other users or uses.

6.7.5 Relevant Amenities Applicable for Options 9 and 10

The following amenities to be within 500m proximity of the development

 Appropriate food outlet  Access to cash  Access to an outdoor open space (public or private, provided suitably sized and accessible to building users)  Access to a recreation or leisure facility for fitness or sports  Publicly available postal facility  Community facility  Over the counter services associated with a pharmacy  Public sector GP surgery or general medical centre  Child care facility or school

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7.0 Legislative Considerations and Programme

7.1 Planning Permission

Planning permission will be required for the proposed development at MRD Northolt.

We had approached Knight Frank, who in turn contacted Lambeth Smith Hampton, the MPS’ planning advisors, for their initial view on the option 4 proposals. Unfortunately, at the time of writing this report we were yet to receive comment from Lambert Smith Hampton. Option 5 has not been seen by the planning authority.

It is recommended that pre-planning advice is sought during RIBA 2 Concept Design.

7.2 Listed Building Consent

MRD Northolt is not a Listed Building and therefore Listed Building Consent is not required.

7.3 Building Regulations and Building Control Approval

We have approached Butler and Young, the MPS’ Approved Inspector, for their initial view on the option 4 proposals. Unfortunately, at the time of writing this report we were yet to receive comment from Butler and Young. Option 5 has not been submitted to them.

7.4 Programme

We understand that lease for the Perivale site is due to expire in December 2021. As a result, the development at MRD Northolt must be complete and operational by this date.

We appreciate the procurement method would be considered at RIBA 2 Concept Design – i.e. traditional or design and build. We have however provided an outline programme within Appendix O.

This is a high-level indicative programme, and its purpose is purely to indicate timescales in order to achieve completion of the MRD Northolt by December 2021. This would be reviewed and developed at RIBA 2 Concept Design Stage.

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8.0 Feasibility Cost Estimate

8.1 Feasibility Cost Plan - Notes

1. We have prepared cost plans for each of the 5 options.

2. All allowances include main contractor’s preliminaries at 12%, and overheads and profit at 4.75%.

3. We have measured areas taken from the drawings as the basis of estimate.

4. The allowance for demolition will need to be confirmed by site visit and further research work.

5. At the time of preparation of this preliminary estimate, no information has been made available on soil condition or geotechnical ground conditions. The allowances for substructures assume low risk.

6. An allowance of £1,000,000 for ground contamination and £500,000 for asbestos removal have been included which will need to be firmed up following surveys and ground investigations. Remediation allowance assumes in-situ remediation and shallow site wide contamination.

7. It is assumed that sufficient statutory services (Gas, Water, Telecoms and Drainage) exist at the site perimeter and do not require upgrade / enhancement.

8. Risk has been included at 5% and would need to be analysed / updated as a next stage.

9. We have assumed that FF&E will be a direct purchase not through the construction contract.

10. It is assumed a fire suppressant system is not required to car park areas.

11. It is assumed AV costs to offices is funded from FFE allowance

12. Specialist fence suppliers advise specified security fence can not achieve prescribed SR rating

13. The following allowances have been set by PSD

a. Allowance for FFE £250,000 b. Allowance for relocation of specialist car inspection equipment £250,000 c. Professional fees (incl planning) at 15% d. Contingency 7.5% (Gleeds recommendation 10%) e. PSD staff costs 3% f. Digital policing works / equipment 3.5% 14. All IT works including CCTV installation are deemed included within digital policing allowance of 3%

15. All figures exclude VAT.

16. Inflation to future programme excluded (costs at 4Q 2018)

17. Site acquisition costs excluded

18. End of lease costs associated with Perivale excluded.

19. Costs associated with retaining Perivale excluded

20. Services diversion costs excluded

21. Statutory services infrastructure enhancement costs / contributions excluded.

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8.2 Feasibility Cost Plans - Summary

We have set out within the table below a summary of the feasibility cost plans for each of the 5 options.

SUMMARY

Item Description Option 1 Option 2 Option 3 Option 4 Option 5

Further information on the cost plans is provided within appendix P to this report.

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