MBP 5394 Spring Lane Primary School · 2017. 2. 13. · MBP-5394: NORTHAMPTON SCHOOLS EXPANSION j_m = DRAINAGE ASSESSMENTS ^ Based upon the discharge unit method from BS EN 12056

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SPRING LANE PRIMARY SCHOOL

NORTHAMPTON PRIMARY SCHOOLS EXPANSION

NOVEMBER 2012

MBP-5394: NORTHAMPTON SCHOOLS EXPANSION j_m=

DRAINAGE ASSESSMENTS

^ Based upon the discharge unit method from BS EN 12056 Part 2

* Based upon a 30 year return period.

PREAMBLE

This report has been prepared by Michael Barclay Partnership LLP on the instructions of, and for

the sole use and benefit of, the Client.

Michael Barclay Partnership LLP shall not be responsible for any use of the report or its contents for any purpose other than that for which it was prepared and provided. If the Client wishes to

pass copies of the report to other parties for information, the whole of the report should be copied. No professional liability or warranty is extended to other parties by Michael Barclay Partnership LLP as a result of permitting the report to be copied or by any other cause without

the express written agreement of Michael Barclay Partnership L LP.





SPRING LANE PRIMARY SCHOOL (NN1 2JW) FOUL WATER ASSESSMENT

The new building contains 14 WCs, 14 WHBs, 1 Cleaner’s Sink, & 8 classroom sinks. This will increase the flows from the site by approximately 4.2 l/s^.

STORM WATER ASSESSMENT

The new building sits completely on an existing impermeable area (playground) and as such will

not increase storm run-off from the site. A new hard surfaced all weather court is to be provided as compensation for the lost hard area under the new building. This means that the hard area will increase by approximately 473m2. Using the modified rational method, this will increase storm run-off from the site by approximately 11.7l/s*. FLOODING

The extract below (from EA indicative flood zone maps) shows that the site lies within flood zone 1 and the development site is less than 1 hectare. As such a flood risk assessment is not required.

DRAINAGE STRATEGY

The new building is located over the top of the existing storm water drains which will need to be diverted. Roof run-off shall be collected and discharged into the existing drain at the northern end of the building and into the diverted drain to the southern end. This drain will connect into an existing chamber prior to discharge into the public storm water sewer in Scarletwell Street.





Run-off from the new all-weather court will be collected via channels and discharged into the

storm water drainage system. In order to maintain existing discharge rates, a flow control device, in association with an

attenuation tank, will limit the discharge to that of the existing site. The existing foul drainage is too high for the new building to drain by gravity, to this end the foul flows will be collected and discharged into the existing public foul water sewer which runs in Scarletwell Street. A new connection agreement will be required with Anglian Water. The drainage strategy is shown on drawing number MBP5394/508a and the increase in

impermeable area is shown on drawing number MBP5394/508b.

This plan is provided by Anglian Water pursuant to its obligations under the Water Industry Act 1991 sections 198 or 199. It must be used in conjunction with any search results attached. The information on this plan is based on data currently recorded but the position must be regarded as approximate. Service pipes, private sewers and drains, and former private sewers and drains transferred to Anglian Water on or after 1 October 2011 are generally not shown. Users of this map are strongly advised to commission their own survey of the area shown on the plan before carrying out any works. The actual position of all apparatus MUST be established by trial holes. No liability whatsoever, including liability for negligence, is accepted by Anglian Water for any error or inaccuracy or omission, including the failure to accurately record, or record at all, the location of any water main, discharge pipe, sewer or drain or disposal main or any item of apparatus. This information is valid for the date printed. The plan is produced by Anglian Water Services Limited from Ordnance Survey © Crown Copyright, 100018507. This map is to be used for the purposes of viewing the location of Anglian Water infrastructure only. Any other use of the map data or further copies are not permitted. This notice is not intended to exclude or restrict liability for death or personal injury resulting from negligence.

Pumping Station

Manhole

Inlet

Outfall

Sewage Treatment Works

Foul Sewer

Final Effluent

Decommissioned Sewer

(Colour denotes effluent type)


Surface Sewer

Combined Sewer(Colour denotes effluent type)



Date: 02/10/12 Scale: 1:1250 Data updated: 01/08/12Map Centre: 474972.6,260817.1Ordnance Survey Mapping © Crown Copyright 1000018507 Wastewater Plan A2Our Ref: 40815 - 2

[email protected]

Spring

Rising Main

Private Sewer(Colour denotes effluent type)

Manhole Reference Liquid Type Cover Level Invert Level Depth to Invert

0001 C 71.14 66.4 4.74

0002 C 70.15 65.46 4.69

0007 C 67.78 62.89 4.89

0008 C 67.42 62.64 4.78

0601 C 74.16 70.34 3.82

0602 C -99 -99 -99

0701 C 69.42 64.89 4.53

0702 C 71.67 67.3 4.37

0706 C 71.076 67.623 3.453

0807 C -99 -99 -99

0904 C -99 -99 -99

0905 C 70.028 65.965 4.063

1001 C 72.67 69.02 3.65

1004 C 74.33 69.02 5.31

1601 C 74.68 68.27 6.41

1602 C 74.89 68.68 6.21

1603 C 73.74 68.93 4.81

1604 C 74.31 70.9 3.41

1605 C -99 -99 -99

1801 C -99 -99 -99

1802 C 74.95 69.55 5.4

1901 C 74.19 69.92 4.27

1902 C -99 -99 -99

1903 C 74.43 70.12 4.31

2601 C 76.98 72.4 4.58

2602 C -99 -99 -99

2603 C -99 -99 -99

2604 C -99 -99 -99

2701 C 76.5 69.57 6.93

2903 C -99 -99 -99

3802 C 81.695 78.062 3.633

6605 C -99 -99 -99

8002 C -99 -99 -99

8607 C 61.271 57.894 3.377

8701 C 60.926 57.93 2.996

8703 C 62.557 57.961 4.596

8704 C 63.609 59.927 3.682

8705 C 63.767 59.807 3.96

8801 C 60.957 58.113 2.844

8802 C 60.978 58.135 2.843

8803 C -99 58.142 -99

8901 C 61.25 58.15 3.1

8902 C 61.597 58.232 3.365

9004 C 63.31 60.25 3.06

9005 C -99 60.11 -99

9006 C -99 -99 -99

9007 C -99 -99 -99

9604 C 69.205 66.09 3.115

9701 C 65.971 61.576 4.395

9702 C 77.73 -99 -99

9703 C -99 65.651 -99

9704 C 63.528 60.448 3.08

9804 C 63.73 60.9 2.83

9805 C 63.654 59.479 4.175

9901 C 63.148 60.506 2.642

0704 F 71.75 69.38 2.37

0705 F 72.16 69.81 2.35

0802 F 69.98 64.54 5.44

0803 F 70.39 68.11 2.28

0804 F 71.32 68.21 3.11

0805 F 70.98 68.48 2.5

0806 F 71.09 68.67 2.42

0903 F 70.12 67.37 2.75

1701 F 72.82 70.55 2.27

1904 F 70.5 68.14 2.36

1905 F 71.64 69.32 2.32

1906 F 72.79 69.32 3.47

1907 F 73.64 69.97 3.67

2001 F 74.46 72.66 1.8

2002 F 75.01 73.19 1.82

2004 F 67.45 63.78 3.67

2702 F 76.71 70.74 5.97

2703 F 79.55 75.93 3.62


8853 S -99 -99 -99

8951 S 62.92 59.1 3.82

8952 S 62.923 59.113 3.81

9051 S 61.79 59.63 2.16

9054 S -99 -99 -99

9055 S 62.52 59.79 2.73

9651 S 68.092 66.849 1.243

9652 S -99 67.915 -99

9653 S 71.946 67.236 4.71

9654 S 68.738 67.623 1.115

9655 S -99 -99 -99

9656 S 69.634 -99 -99

9752 S 68.583 -99 -99

9753 S -99 -99 -99

9754 S -99 -99 -99

9851 S 63.813 61.374 2.439

9852 S 67.69 66.699 0.991

9853 S 61.262 60.933 0.329

9951 S 67.123 64.694 2.429

9952 S 63.307 62.316 0.991

9953 S 61.675 59.275 2.4


2704 F -99 -99 -99

2705 F -99 -99 -99

2801 F 76.79 70.72 6.07

2802 F 77.98 73.67 4.31

2803 F 77.88 74.86 3.02

2804 F 76.82 71.21 5.61

2805 F -99 -99 -99

2901 F 78 -99 5.09

2902 F -99 -99 -99

3804 F 81.4 77.79 3.61

3901 F 77.995 73.341 4.654

3903 F 79.898 75.546 4.352

6701 F 59.844 58.168 1.676

8601 F -99 63.682 -99

8602 F 68.437 65.084 3.353

8603 F 65.212 63.56 1.652

8604 F -99 63.746 -99

8605 F 65.212 63.56 1.652

8606 F 62.862 60.728 2.134

8608 F 65.782 63.599 2.183

8609 F -99 -99 -99

9601 F 70.905 67.851 3.054

9602 F 69.686 66.69 2.996

9603 F 68.162 66.074 2.088

9801 F 62.432 59.765 2.667

9802 F 63.877 61.414 2.463

9803 F 66.775 63.779 2.996

9902 F 63.033 61.685 1.348

0751 S 72.18 70.21 1.97

0752 S 71.02 69.43 1.59

0851 S 70.46 68.06 2.4

0852 S 71.45 68.9 2.55

0853 S 71.09 69.2 1.89

0854 S 70.02 67.62 2.4

0951 S 69.857 68.409 1.448

1651 S 74.74 68.51 6.23

1751 S 72.54 70.43 2.11

1752 S 72.94 71.2 1.74

1753 S 75.22 69.55 5.67

1754 S -99 -99 -99

1851 S 74.88 71.95 2.93

2051 S 74.98 73.6 1.38

2052 S 74.48 73.2 1.28

2651 S 73.47 -99 -99

2652 S -99 -99 -99

2751 S 69.36 -99 0.16

2752 S -99 -99 -99

2753 S -99 78.02 -99

2754 S 76.5 72.44 4.06

2851 S 76.79 73.37 3.42

2852 S 79.5 78.59 0.91

2853 S 76.79 72.95 3.84

2951 S 77.92 75.68 2.24

2952 S -99 -99 -99

3052 S 77.86 76.12 1.74

3851 S 81.4 79.35 2.05

3951 S 78.46 75.95 2.51

3952 S 79.8 78.1 1.7

6651 S -99 -99 -99

8051 S 62.55 59.11 3.44

8052 S 61.21 58.74 2.47

8056 S 62.61 59.33 3.28

8651 S -99 -99 -99

8652 S -99 -99 -99

8653 S -99 64.749 -99

8751 S 63.2 -99 -99

8752 S 63.252 62.77 0.482

8753 S 64.977 63.048 1.929

8754 S 63.218 61.061 2.157

8755 S -99 -99 -99

8758 S 63.145 62.588 0.557

8851 S 60.978 58.183 2.795

8852 S 60.887 59.363 1.524


9.1

gate

way

®

gateway®

appl

icat

ions The Gateway® architectural bulkhead series offers a

variety of styles designed to accent architectural

settings and meet the needs of extreme environments

with its die-cast aluminium and injection-moulded

polycarbonate enclosures. Available in round and oval

shapes for wall or ceiling mounting, Gateway® provides

four distinct designs for a wide array of attractive looks

to enhance the space. The versatile Gateway® series

accepts a wide selection of compact fluorescent and

high intensity discharge lamps to provide superior

performance and uniform illumination, improving

visibility for commercial and institutional public use

facilities.

Public buildings

Entrances

Lobbies

Corridors

Canopies

Multi-storey

Car parks

gate

way

®

9.2

gateway round

opal lens

eyelid design

features and benefits

Contemporary styling in different shapes

> Aesthetic appeal to complement

today’s architecture

High quality construction

> Durable and vandal-resistant

Total lamp obscurity

> Even, glare-free illumination

Polycarbonate lens

> Flexibility of use

Choice of lamp types

> Versatility

Totally enclosed luminaire

> Suitable for wide range of

applications

lamp types included

35W - 70W metal halide

18W - 42W compact fluorescent (various)

IP rating

IP659

approvals

Complies with EN60598

gateway oval

5 kg

interior

9.3

gate

way

®

gateway round slim line gateway round slim line eyelid

gateway oval slim line eyelid gateway oval slim line

light distributions

150mm

weights & thermal data

Unit Lamp Type Weight (kg) Min Operating Max Ambient*Temperature (˚C) Temperature (˚C)

GRC 35W CDMT 5.6 -20 25

GRC 70W CDMT 5.9 -20 25

GRC 26W TRT 5.3 / 4.5* -5 25

GRC 32W TRT 4.5 -10 25

GRC 42W TRT 4.5 -10 25

GRC 2 x 42W TRT 4.8 -5 25

GRS 2 x 26W PL 3.1 -5 25

GRS 32W TRT 2.9 -10 25

GRS 26W TRT 2.9 -5 25

GOC 42W TRT 3.7 -10 25

GOC 18W TRT 4.5 / 3.7* -5 25

GOC 35W CDMT 5.6 -20 25

GOS 32W TRT 2.4 -10 25

GOS 26W TRT 2.4 -5 25

GOS 18W TRT 2.4 -10 25

* Non emergency onlyEmergency below:26W TRT Round Emergency +25˚C26W TRT Emergency +25˚C18W TRT Oval Emergency +25˚C

specification

The (round / oval) bulkhead luminaire shallconsist of a powder coated pressed steel backplate (GRS / GOS) or a die cast aluminiumhousing (GRC / GOC) and a cast aluminiumbezel. The housing encloses a reflector andintegral control gear to suit a choice of 18W,26W, 32W, 42W TRT compact fluorescent lampsor 35W, 70W ceramic metal halide high intensitydischarge lamps, depending on whether this beGRS/GOS or GRC/GOC. The lens shall be a UVstabilised opal diffuser secured in place by a diecast aluminium bezel ensuring environmentalprotection to IP659 (20 joules impactresistance). The luminaire shall be suitable forsurface mounting and complies with EN60598with a choice of options and accessories.

Ø 356

.RF1

.RF1

.RF2

.RF3

175

356

104

229

.OF1

.OF2

.OF3

104

173

GRS

GRC

GOC

GOS

Photometric data is availableat www.holophane.co.uk

gate

way

®

9.4

.RF1

.RF2

.RF3

.OF1

.OF2

.OF3

round style oval style

interior

9.5

gate

way

®

ordering details : luminaire

CodeGRS Round Gateway slim-line bulkheadGRC Round Gateway cast bulkhead

Code Lamp Type .35CDMTF3 35W Clear CDM-T 3000K ceramic metal halide lamp (G12) base*.70CDMT3 70W Clear CDM-T 3000K ceramic metal halide lamp (E27) base*.26TRT 26W Triple tube 4000K compact fluorescent 4 pin lamp (Gx24q-3) base.32TRT 32W Triple tube 4000K compact fluorescent 4 pin lamp (Gx24q-3) base.42TRT 42W Triple tube 4000K compact fluorescent 4 pin lamp (Gx24q-4) base*.242TRT 2 x 42W Triple tube 4000K compact fluorescent 4 Pin lamp (Gx24q-4) base*.226PL4 2 x 26W 4000K Compact fluorescent 4 pin lamp (G24d-2) base**

Code Style.RF1 Round front design with opal polycarbonate lens.RF2 Round front with horizontal eye lid design with opal polycarbonate lens.RF3 Round front with cross design with opal polycarbonate lens

Code Colour.C1 White (RAL 9016).C4 Graphite (RAL 7011).C6 Grey (RAL 7035).C7 Black (RAL 9005).C9 Metallic Silver (RAL 9006).RAL**** RAL Colour (Customer Choice)***

Code Options †.ME Self contained 3 hour maintained emergency battery & invertor.T Factory fitted miniature photocell.TW Through wiring.V Tamper resistant screws†.SHR Decorative shroud††

Code Optional Paint Finish .C Enhanced paint finish*

GRC .70CDMT3 .RF1 .C9 .T .C

*Not available with GRS option. **available with GRC, GRS option. ***Please specify RAL colour reference. †.V option available for to GRC & GRS all otheroption only available to GRC. ††Only available for GRC. Note: Luminaires are supplied as standard for use on 240V 50Hz supply and complete with lamp.For 230V 50Hz add prefix ‘N’. Other supply variations available on request.

Example

gate

way

®

9.6

luminaire accessorires

CodeGOC.VK Vandal key suitable for all Gateway versions

CodeGOS Oval Gateway slim-line bulkheadGOC Oval Gateway cast bulkhead

Code Lamp Type .35CDMTF3 35W Clear CDM-T 3000K ceramic metal halide lamp (G12) Base*.18TRT 18W Triple tube 4000K compact fluorescent 4 pin lamp (Gx24q-2) base.26TRT 26W Triple tube 4000K compact fluorescent 4 pin lamp (Gx24q-3) base.32TRT 32W Triple tube 4000K compact fluorescent 4 pin lamp (Gx24q-3) base*.42TRT 42W Triple tube 4000K compact fluorescent 4 pin lamp (Gx24q-4) base

Code Style.OF1 Oval front design with opal polycarbonate lens.OF2 Oval front with horizontal eye lid design with opal polycarbonate lens.OF3 Oval front with cross design with opal polycarbonate lens

Code Colour.C1 White (RAL 9016).C4 Graphite (RAL 7011).C6 Grey (RAL 7035).C7 Black (RAL 9005).C9 Metallic Silver (RAL 9006).RAL**** RAL Colour (Customer Choice)**

Code Options.ME Self contained 3 hour maintained emergency battery & invertor.T Factory fitted miniature photocell.TW Through wiring.V Tamper resistant screws

Code Optional Paint Finish .C Enhanced paint finish

GOS .18TRT .OF2 .C9 .V .C

*Only available with GOC range. **Please specify RAL colour reference.

Example

interior

The Wool Hall T: 0117 910 5200

12 St Thomas Street F: 0117 926 0221 Bristol [email protected]

BS1 6JJ www.ionacoustics.co.uk

Ion Acoustics Ltd. Consultants in Acoustics Registered in England and Wales No. 5920418

SPRING LANE PRIMARY SCHOOL

ENVIRONMENTAL NOISE SURVEY

Acoustics Report A532/R01

24th October 2012

Report for: Northampton Schools Ltd

Report issued to:

Architecture Initiative 3rd Floor West 385 Barrett Street W1U 1AY Attention: Rowan Parnell

Prepared by: Checked by: Chris Borak BSc MIOA David O'Neill BEng MSc CEng MIOA Issue/Revision number Date A532/R01

24/10/2012

Spring Lane Primary School – Environmental Noise Survey

A532/R01 24th October 2012

Contents 1 Introduction ........................................................................................................................... 1 2 Site Proposal .......................................................................................................................... 1 3 Site and Surroundings ............................................................................................................. 2 4 The Building Regulations and Building Bulletin 93 (BB93) .......................................................... 3 5 Noise Limits............................................................................................................................ 4

5.1 External Noise Limits....................................................................................................... 4 5.2 Internal Noise Limits ....................................................................................................... 4

6 Noise Survey .......................................................................................................................... 6 6.1 Procedure ...................................................................................................................... 6 6.2 Measurements ................................................................................................................ 7 6.3 Weather Conditions ........................................................................................................ 7 6.4 Results – External Noise Levels ........................................................................................ 7

7 Implications for Ventilation ...................................................................................................... 9 8 External Plant Noise Limits ..................................................................................................... 10 9 Summary .............................................................................................................................. 11


A532/R01 24th October 2012 Page 1

1 Introduction

Ion Acoustics is appointed by Architecture Initiative on behalf of Northampton Schools Ltd to

provide acoustic advice on external noise in respect of potential expansion of a number of

primary schools in Northampton. This report relates to an external noise assessment for a

proposed new teaching block for Spring Lane Primary School in Northampton.

Requirement E4 of the Building Regulations applies to the acoustics of new school buildings and

applies to this project. Detailed advice on meeting the Building Regulations Requirement E4 is

provided in Building Bulletin 93 (BB93). This report relates only to environmental noise

affecting the proposed new teaching block.

Ion Acoustics has carried out a noise survey at the site to determine baseline environmental

noise levels. The results have been used to assess the implications for the ventilation strategy,

building envelope sound insulation and compliance with the noise level performance standards

in BB93. The results have also been used to determine suitable external plant noise limits for

the proposed development. This report documents the survey findings.

2 Site Proposal

The proposal is to construct a new two story teaching block to the west of the existing main

Spring Lane Primary School building. The new teaching block will likely comprise eight

classrooms and associated ancillary circulation and accommodation space. The current

preferred location for the new block is shown in pink in Figure 1.



Figure 1 – Proposed School layout and Survey Locations

3 Site and Surroundings

Spring Lane Primary School is in an area with both residential and industrial buildings. The

school has some light industrial immediate neighbours to the north of the proposed new

teaching block. Slightly further away, 90m to the west on the other side of St Andrews Road, is

Northampton Aggregates which uses mobile plant and open trucks throughout the day. The

line of sight from the proposed teaching block to Northampton Aggregates’ operations is broken

only by trees; these provide no significant acoustic shielding. St Andrews Road is not the

busiest road in the area but traffic flows are virtually continuous at all times of the day. Also to

the west is the mainline railway to Northampton Station.

The nearest residential receptor to the proposed new teaching block is Grafton House, which is

22m to the south, on the opposite side of Scarletwell Street. The closest housing is on the East

side of Wilkinson Avenue and the South of Walter Road. Grafton House and all the noise

sources discussed above are marked on the aerial photograph in Figure 2.

Unattended

Monitoring Location

Attended

Monitoring Location



Figure 2 – Aerial Photograph 8 Showing significant noise sources (base image ©2012 GeoEye)

4 The Building Regulations and Building Bulletin 93 (BB93)

Requirement E4 from Part E of Schedule 1 to The Building Regulations 2000 states:

“Each room or other space in a school building shall be designed and constructed in such a way

that it has the acoustic conditions and the insulation against disturbance by noise appropriate to

its intended use.”

Approved Document E provides further information on complying with the Building Regulations

and includes the following statement:

“In the Secretary of State’s view the normal way of satisfying Requirement E4 will be to meet

the values for sound insulation, reverberation time and internal ambient noise which are given

in Section 1 of Building Bulletin 93 ‘The Acoustic Design of Schools’, produced by DfES.”

The performance standards indicated within Section 1 of BB93 should, therefore, form the basis

for the acoustic design of new schools. Section 1.1 of BB93 states that:



“The overall objective of the performance standards in Section 1.1 is to provide acoustic

conditions in schools that (a) facilitate clear communication of speech between teacher and

student, and between students, and (b) do not interfere with study activities.”

The BB93 standards and regulations are directly applicable to the following rooms and spaces:

• All teaching and learning spaces.

• Administration and ancillary spaces in as much as they affect adjacent learning spaces.

• Adult/Community education spaces (if any).

• Nurseries which are part of a school.

It is useful to note that meeting the numerical standards in BB93 is the normal method of

complying with Requirement E4. However, if alternative standards can be demonstrated to be

appropriate, then it can be acceptable not to comply with the numerical performance standards.

This is subject to agreement with the school and the building control body. Section 1.2.1 of

BB93 describes this process.

5 Noise Limits

5.1 External Noise Limits

BB93 gives fairly conservative advice on noise levels in respect of sites for new schools. Section

2.3 states: “If the noise measurement survey shows that the ambient external noise levels on

the site are below 45 dB LAeq,30min…, no special measures are likely to be necessary to protect

the building or playing fields from external noise”. However, sites below 45 dB LAeq are rare in

urban areas.

In terms of playgrounds and playing fields, BB93 states “Noise levels in unoccupied

playgrounds, playing fields and other outdoor area should not exceed 55 dB LAeq,30min and there

should be at least one area suitable for outdoor teaching activities where noise levels are below

50 dB LAeq,30min.”

Note that, the recommendations on noise levels in outdoor areas in BB93 do not form part of

the Building Regulations and are, therefore, stated as non8mandatory guidance only. The

LAeq,30min index is defined as the equivalent steady8state noise level with the same energy as the

actual fluctuating noise over the time period (in this case 30 minutes).

5.2 Internal Noise Limits

In schools which are naturally ventilated, the internal noise climate is determined by noise

transmission from the exterior. For mixed mode or fully mechanically ventilated schools, the

noise climate is a combination of the noise from mechanical services and from the exterior. A

sound level difference of 10 dB is often assumed for a façade with open windows and,

assuming an internal noise limit of 35 dB LAeq, as recommended for classrooms in Table 1.1 of

BB93, this translates as a maximum external noise level of 45 dB LAeq as stated in Section 2.3

BB93 (quoted above).



External noise levels at most urban school sites exceed 45 dB LAeq, and hence the application of

the internal noise limits was revised in the Building Bulletin 101 “Ventilation in School Buildings”

(BB101). BB101 states that where natural ventilation is provided, the BB93 noise limits must be

maintained for ventilation rates of 3 l/s/person, but noise levels 5dB(A) higher are permitted at

a ventilation rate of 8 l/s/person (i.e. with windows more fully opened). Therefore, naturally

ventilated teaching rooms now effectively have two noise limits according to the ventilation

rate. These are set out in Table 1 below for various rooms.

The ambient noise limits given in BB93 represent the combined noise levels from the following

sources:

• External noise, e.g. traffic, railways, aircraft, industrial noise

• Mechanical services, e.g. Ventilation systems and Plant.

Noise sources excluded from the targets are:

• Teaching activities within the school premises including in playgrounds

• Equipment noise, e.g. from machine tools, computers, fume cupboards

• Rain noise – however, BB93 states that rain noise should be controlled so that it does

not impinge upon the performance of the school. Numerical targets are not specified.

Table 1 – Internal Noise Targets derived from BB93 and BB101

Room Internal Noise Limit,

LAeq,30mins dB at ventilation

rate of 3l/s/person and for

mechanical ventilation#.

Internal Noise Limit,

LAeq,30mins dB at ventilation

rate of 8l/s/person

(natural vent only)

Primary classrooms, Class bases,

General teaching areas, small

group rooms

35 dB 40 dB

Nursery school playrooms and

quiet rooms 35 dB 40 dB

Music Classroom 35 dB 40 dB

Assembly Hall 35 dB 40 dB

Library (Resource Area) 40 dB 45 dB

Classrooms* designed specifically

for use by hearing8impaired

students (including speech

therapy rooms)

30 dB* 30 dB*

* 8 Note that no relaxation is permitted for these rooms

# 8 Note that with mechanical ventilation the room must meet the lower BB93 target at the design

ventilation rate.

Hence, the general internal noise limit under natural ventilation conditions is LAeq 35 or 40 dB

depending on the ventilation rate for most teaching spaces. Note that, BB93 requires a lower

limit of 30 dB LAeq for rooms “specifically designed” for hearing8impaired pupils or for speech

therapy and that no relaxation is permitted under BB101. We are not aware of any

requirement for such rooms in the proposed new teaching block, but if there were, this must be



brought to the attention of the designers and the specific room would be subject to the more

onerous acoustic design criteria.

A window only slightly open and providing only background ventilation provides better sound

insulation than one which is fully open. Therefore, taking 10 dB(A) at standard attenuation for

an open window, sites which have external noise levels no greater than LAeq 50 dB are

demonstrably suitable for naturally ventilated teaching accommodation.

BB101 encourages the use of natural ventilation in schools. Where there are difficulties in

meeting these limits BB101 suggests that “alternative performances standards” as permitted

under Section 1.2.1 of BB93 may be appropriate, if agreed with the school and acoustic

specialist. BB101 states in section 1.6.1:

“It is recognised that the acoustic needs of classrooms are stringent and may prevent the use

of natural ventilation in some circumstances, even given the suggested addition of 5 dB to the

requirements when providing external air at a rate of 8 l/s per person. Consequently, the

designer is advised to refer to section 1.2.1 of Building Bulletin 93

The aim of quoting this statement of ‘alternative performance standards’ for the acoustic

requirements in this Building Bulletin on ventilation, is to allow some flexibility so that the

ventilation requirements of schools can be met by natural means, wherever it is possible to

maintain a level of acoustic performance that is deemed appropriate by the users of the

school. It is intended that this will lessen the likelihood of an unwanted mechanical

ventilation system being installed, incurring unnecessary capital and running costs.”

It is, therefore, recognised that the benefits of providing natural ventilation may, for some sites

where noise levels are slightly above LAeq 50 dB, outweigh the slightly increased internal noise

levels. However, this would need to be accepted and approved as an “Alternative Performance

Standard” following the procedures of BB93. Effectively the school must agree to accept the

slight reduction in acoustic conditions.

6 Noise Survey

6.1 Procedure

The noise survey was carried out at the existing school site on 3rd October 2012. All

measurements were external. The measurement locations are shown on Figure 1.

Measurement microphones were mounted on tripods at around 1.5m above local ground level

and at least 3m from vertically reflective surfaces such as building façades or walls.

To properly access the site background noise level in accordance with BB93 and BS4142 it is

necessary to exclude activity noise from the existing school and any other non8typical noise.

The survey took place on a normal school day; therefore, it was necessary to pause the sound

level meter during periods of school activity as BB93 excludes school activity from the internal

noise limits. On the day of the survey there was some construction work taking place on site

which did disrupt some measurements and restrict the period of useful data.



6.2 Measurements

Two monitoring systems were used; one was left to log unattended during the survey and the

other was used to perform attended measurements in octave frequency bands.

Measurements at the unattended location were made using a Rion NL52 sound level meter

which logged noise levels in ten minute intervals. As the meter was unattended these

measurements included all activity noise from pupils and the construction work.

Measurements at the attended location were made using a Norsonic 140 sound level meter.

Attended measurements were generally in either 10 minute intervals; however, some were cut

short by interruption. During attended monitoring, extraneous noise was omitted as far as

possible.

Both meters were calibrated using a Brüel & Kjær 4231 calibrator before and after the

measurement periods. No drift in the calibration level was noted in either meter.

6.3 Weather Conditions

The weather conditions for the survey were recorded using a hand held anemometer and

thermometer and were as follows:

Average temperatures: 12°C

Wind Speed at microphone: 5 m/s

Wind direction: South8Westerly

Although monitoring was cut slightly short by rain at 16:50 there was no precipitation during

most of the survey. The weather conditions were generally acceptable for environmental noise

monitoring and the wind direction represented the most typical conditions under the prevailing

wind direction.

6.4 Results – External Noise Levels

The measured noise levels for the attended external position are given below in Table 2.



Date and Time Duration (hh:mm:ss) LAeq, dB LA01, dB LA90, dB

03/10/2012 11:10 00:10:00 55.9 64.9 52.0

03/10/2012 11:20 00:10:00 54.5 59.5 51.8

03/10/2012 11:30 00:10:00 54.8 62.0 50.7

03/10/2012 11:41 00:10:00 55.8 63.2 51.7

03/10/2012 11:51 00:10:00 55.5 64.2 50.9

03/10/2012 16:20 00:09:53 54.1 60.0 50.9

03/10/2012 16:30 00:08:55 54.1 59.8 50.0

Average/Minimum 55.0 61.9 50.0

Note 1: The summary values are given as the energy average for LAeq, the arithmetic average

for LA01 and the lowest measured value for LA90.

Table 2 – Attended Noise Survey Results

The results of the unattended survey have been plotted in Figure 3. Periods known to have

been affected by school activity noise have been shaded in red.

Figure 3 – Time history plot of noise levels from unattended monitor

From Figure 3 and Table 2 it can be concluded that in the absence of school activity noise and

any other on site activity, the typical ambient noise level on the Spring Lane School Campus is

55dB LAeq.

The dominant continuous noise source heard during the survey was road traffic on St Andrews

Road to the west. Other noises heard were from Northampton Aggregates activity (to the

west), noise from the an extraction fan at the rear of a light industrial unit on Spring Lane and

‘wheel squeal’ from the railway (also to the west). The alternative location shown in blue in



Figure 2 would be less exposed to noise from the West due to screening provided by an existing

building which is not part of the school.

The extraction unit on the neighbouring industrial premises was observed to operate between

one and two times in each ten minute period and for up to a minute each time. When

operational, noise from the extraction unit was 55dB(A) at the measurement location. Audible

train noise was rare, however, wheel squeal of 53dB(A) at the measurement location was

noted. Noise from Northampton Aggregates included the rumbling of the diesel engines from

large mobile plant and occasional tipping which registered 58dB(A) at the measurement

location. These noises are constituents of the measured 55dB LAeq average noise level but none

are significant enough to require separate consideration.

7 Implications for Ventilation

In the absence of school activity noise and temporary noise sources (construction noise) the

typical ambient noise level on the proposed teaching block site is 55dB LAeq.

The intention is to naturally ventilate the proposed building. Background ventilation of 3 l/s/p

can be provided through small window openings where sound insulation of 15 dB(A) can be

achieved. Hence under conditions with small openings, internal levels will be LAeq 40 dB. With

windows open to provide higher levels of ventilation (8 l/s/p +) attenuation of 10dB(A) can be

assumed through the façade. This will results in internal levels of LAeq 45 dB.

Therefore, noise levels in the classrooms of the proposed new teaching block may be above the

limits from BB93 even when applying the 5dB relaxation allowable under BB101 for naturally

ventilated school buildings.

The current proposal is that all windows to classrooms will be in the north and south facades,

This will provide slightly lower internal noise levels than if the windows were in the western

façade.

As the majority of the identified noise sources are to the west a significant improvement in

internal noise levels with windows open can be achieved by specifying side hung casement

windows hinged to the west. So when the windows are open some screening is provided

against noise from the west. This should provide the extra 5dB of attenuation required to meet

BB93 internal noise levels with the BB101 natural ventilation relaxation.

If side hung casement windows are not included in the design, and standard openable windows

or louvres are used, then noise levels would be expected to be slightly above the BB93/BB101

internal noise limits, perhaps by 2dB(A) to 4 dB(A). In this case it would be necessary to seek

the schools approval for an Alternative Performance Standard under BB93. Classroom internal

noise levels would be of a similar order to what is experienced in the existing two storey

teaching block facing the road, although the new building is very slightly closer to the noise

sources.



The noise levels are not high enough to impose any particular sound insulation requirements on

the building envelope. Any practical form of construction of glazing and external building fabric

will adequately control environmental noise levels

8 External Plant Noise Limits

It is unlikely that there will be any mechanical services plant associated with the new scheme,

and therefore, there would be no need for control of external plant. However, if plant were

added then the background noise levels measured can be used to determine the daytime plant

noise limit at nearby sensitive receptors.

This could be a requirement under a planning condition, typically at the nearest housing, or

under BREEAM if that were a project requirement. Under BREEAM 2011 Pol 05 the limit would

apply at either nearby housing or other teaching blocks in the school.

The lowest background noise level measured during the day was LA90 49 dB and this can be

used to set a relative plant noise limit.

We have consulted with Natasha Stanley, senior environmental health officer for Northampton

Borough Council. She has advised that their current criteria for plant noise are as follows:

“Assuming the plant is emitting steady noise levels, whether it cycles on and off or not, we

expect that the operational noise levels (Leq,T) from that plant should be at least 6 dB below

the minimum Background (L90, 1hour), for the times of operation, at the nearest sensitive

location. This could be an amenity space for daytime or the proximity of a bedroom window

for night time.

Ideally this should be specified in octave bands but if assessed on A8weighted levels then

there should be a BS 4142 assessment that accounts for the character.”

Therefore in principle the plant limit to be would be 6 dB below the L90 in each octave band,

which is a relatively onerous criterion. It is not common to measure the background noise level

in L90 octave bands (particularly as many meters do not record this parameter). We have

recorded spectral L90 levels in some locations, but not all.

An alternative more standard criterion has been discussed and agreed with NBC; specifically

that, should there be any plant, then its rating level according to BS 4142 should be 10dB(A)

below the background noise level outside nearby housing or in gardens of housing or other

relevant amenity areas. The noise limit would therefore be LAr 39 dB.

The limit applies to the aggregate of all new plant operating

The BREEAM 2011 Pol 05 limit requires the rating level as defined by BS 7445 to not exceed the

background noise levels, LA90, by more than 5dB(A) outside nearby noise sensitive

developments. Hence a limit of 54 dB(A) would also apply outside the existing school teaching

room windows and at the nearby housing.



9 Summary

An external noise survey has been carried out at the existing Spring Lane Primary School in

Northampton. Environmental noise levels on site comprise road traffic noise and noise from

local industrial activity; some railway noise was also heard. Typical noise levels affecting the

proposed building will be LAeq 55 dB. Based on this it may not be possible to achieve

appropriate internal noise levels with windows open. Mitigation has been suggested that would

allow a naturally ventilated design to achieve internal noise levels from BB93/BB101. If the

suggested mitigation measured cannot be achieved then alternative performance standards

must be agreed with the school.

The background noise levels measured have also been used to determine plant noise limits at

the nearby sensitive receptors.

Spring Lane Primary School – Appendix A Photos

A532/R01 24th October 2012 Page A1

Unattended Survey Location

Attended Survey Location

Spring Lane Primary School – Appendix B Tabulated Survey Data at Unattended Measurement Position

A532/R01 24th October 2012 Page B1

Unattended Measurements

LAeq LAmax (FAST) LAF01 LAF90

dB dB dB dB

10:50:12 72.0 103.2 79.7 60.0

11:00:12 65.3 86.4 76.5 51.2

11:10:12 58.2 77.6 68.8 50.4

11:20:12 55.8 70.0 66.3 50.2

11:30:12 57.5 73.7 67.9 49.9

11:40:12 57.6 74.8 69.2 50.7

11:50:12 57.8 79.4 67.2 50.0

12:00:12 65.0 85.0 74.9 52.0

12:10:12 66.3 81.5 75.7 54.5

12:20:12 72.3 88.9 81.0 65.2

12:30:12 71.3 87.1 81.2 64.4

12:40:12 72.3 87.8 80.0 65.9

12:50:12 72.9 89.6 80.3 67.2

13:00:12 70.3 88.2 80.1 54.6

13:10:12 58.7 78.7 69.5 51.7

13:20:12 56.7 71.6 66.0 52.1

13:30:12 62.5 89.3 72.5 52.9

13:40:12 57.1 70.3 66.6 51.2

13:50:12 61.1 84.0 74.8 50.0

14:00:12 57.6 73.4 68.4 51.1

14:10:12 57.1 72.4 66.9 51.0

14:20:12 59.0 72.4 69.8 50.6

14:30:12 60.9 73.3 70.4 52.5

14:40:12 56.3 68.5 65.8 51.4

14:50:12 58.6 80.7 69.0 51.9

15:00:12 58.3 83.8 66.8 51.4

15:10:12 60.9 75.8 69.5 53.4

15:20:12 62.8 85.7 72.1 54.6

15:30:12 58.3 71.3 68.1 52.7

15:40:12 57.6 72.8 66.8 51.5

15:50:12 57.0 73.3 68.3 50.2

16:00:12 57.9 72.7 66.5 51.4

16:10:12 56.2 71.1 66.4 49.1

16:20:12 57.1 77.0 68.0 50.2

16:30:12 56.4 69.3 66.0 49.2

Time

Spring Lane Primary School – Appendix B Tabulated Survey Data at Unattended Measurement Position

A532/R01 24th October 2012 Page B2

Attended Measurements 8 Octave Band Data

63 Hz 125 Hz 250 Hz 500 Hz 1.0 kHz 2.0 kHz 4.0 kHz

(2012/10/03 11:10:47.00) 00:10:00 55.9 71.0 62.1 57.1 52.2 50.3 46.4 42.4

(2012/10/03 11:20:52.00) 00:10:00 54.5 67.7 60.5 55.0 49.8 49.9 45.7 40.7

(2012/10/03 11:30:57.00) 00:10:00 54.8 66.1 61.9 55.7 50.2 49.7 45.6 41.3

(2012/10/03 11:41:03.00) 00:10:00 55.8 70.4 60.9 56.2 50.7 50.1 47.1 44.8

(2012/10/03 11:51:36.00) 00:10:00 55.5 67.7 58.7 54.6 50.4 50.2 47.7 45.3

(2012/10/03 16:20:06.00) 00:09:53 54.1 66.0 57.9 53.3 49.6 49.9 45.8 40.4

(2012/10/03 16:30:48.00) 00:08:55 54.1 65.0 58.9 53.3 49.9 50.0 45.3 39.3

Date and TimeLAeq

Duration LAeq, dB

Documents

MBP 5394 Spring Lane Primary School · 2017. 2. 13. · MBP-5394: NORTHAMPTON SCHOOLS EXPANSION j_m = DRAINAGE ASSESSMENTS ^ Based upon the discharge unit method from BS EN 12056