mbp 5394 boothville primary school · mbp-5394: northampton schools expansion j_m = drainage...
TRANSCRIPT
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5 December 2012 jáÅÜ~Éä=_~êÅä~ó=m~êíåÉêëÜáé=iim=áë=~=iáãáíÉÇ=iá~Äáäáíó=m~êíåÉêëÜáé=êÉÖáëíÉêÉÇ=áå=båÖä~åÇ=~åÇ=t~äÉë=Ó=oÉÖ=kç=l`=PORNSQ=Ó=oÉÖáëíÉêÉÇ=~ÇÇêÉëë=NMRJNMV=píê~åÇ=içåÇçå=t`Oo=M^^
BOOTHVILLE PRIMARY SCHOOL
NORTHAMPTON PRIMARY SCHOOLS EXPANSION
DECEMBER 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.
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.
BOOTHVILLE PRIMARY SCHOOL (NN3 6JG) FOUL WATER ASSESSMENT
The new building contains 9 WCs, 9 WHBs, 1 cleaner’s sink, & 4 classroom sinks and 1 kitchenette in the staffroom. This will increase the foul flows from the site by approximately 3.5 l/s^.
STORM WATER ASSESSMENT The new building is to be located on the site of an existing brick house. The house is surrounded by grassed areas and as such the impermeable areas will be increased by approximately 375m2. Using the modified rational method, this will increase storm run-off from the site by approximately 4.8 litres per second*. The proposed extension to the car park will be within an area of existing tarmac and will not increase impermeable areas.
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 straddles the existing storm water drains. As such the existing pipework will need to be diverted around the footprint of the new building.
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.
Foul flows from the new building will be connected into the existing foul chamber which served the demolished building. However, due to the slope of the existing ground (which slopes away from the proposed foul connection) and the shallow manhole itself (0.6m), it may be necessary to utilise a package pumping station to drain the building (this is dependent on the finished floor level of the new building which will be determined at the detailed design stage).
Storm water from the roof will be collected by drains running around the building. This will discharge into the existing storm drains via a flow controlled attenuation tank. A petrol interceptor shall be provided to improve the quality of the surface water run-off from the extended car park.
Drawing number MBP5394/502a shows the drainage strategy for the new building and extended car park, whilst drawing number MBP5394/502b shows the increased impermeable areas.
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)
(Colour denotes effluent type)
Surface Sewer
Combined Sewer(Colour denotes effluent type)
(Colour denotes effluent type)
(Colour denotes effluent type)
Date: 02/10/12 Scale: 1:1250 Data updated: 01/08/12Map Centre: 478363.4,263976.9Ordnance Survey Mapping © Crown Copyright 1000018507 Wastewater Plan A2Our Ref: 40815 - 8
Boothville
Rising Main
Private Sewer(Colour denotes effluent type)
Manhole Reference Liquid Type Cover Level Invert Level Depth to Invert
0702 F 111.8 110.05 1.75
0802 F 116.018 113.25 2.768
0803 F 116.21 112.906 3.304
0804 F 117.591 114.857 2.734
0805 F 117.841 115.881 1.96
0806 F 118.648 117.838 0.81
0900 F 118.648 117.024 1.624
1001 F 120.639 117.566 3.073
1002 F 119.842 117.076 2.766
1101 F 119.285 116.518 2.767
1704 F 113.766 110.617 3.149
1705 F 115.021 113.382 1.639
1706 F 114.177 111.434 2.743
1801 F -99 -99 -99
1802 F 116.92 114.698 2.222
1901 F -99 -99 -99
2101 F 115.454 113.522 1.932
2102 F 115.57 113.436 2.134
2103 F 115.756 114.003 1.753
2704 F 114.902 112.159 2.743
2705 F 114.915 112.766 2.149
2801 F 115.155 113.343 1.812
2802 F 115.634 113.805 1.829
2803 F 116.161 114.268 1.893
3001 F 116.929 113.741 3.188
3003 F 116.308 114.556 1.752
3004 F 116.039 113.266 2.773
3101 F 110.126 108.779 1.347
3705 F 113.802 112.191 1.611
3801 F 115.131 112.856 2.275
3802 F 115.738 113.375 2.363
4001 F 117.88 115.543 2.337
5001 F 114.455 112.175 2.28
5101 F 113.808 111.851 1.957
5102 F 111.349 110.123 1.226
5103 F 112.281 108.026 4.255
6101 F -99 -99 -99
6102 F 108.106 105.99 2.116
7704 F 97.267 95.027 2.24
0050 S 120.907 119.383 1.524
0051 S 120.681 119.639 1.042
0150 S 121.172 119.877 1.295
0151 S 121.66 120.34 1.32
0751 S 111.8 110.05 1.75
0753 S 114.037 111.967 2.07
0754 S 115.03 112.909 2.121
0755 S 115.939 113.671 2.268
0851 S 117.612 115.226 2.386
0852 S 118.035 115.368 2.667
0853 S 117.63 116.006 1.624
0854 S 118.551 115.911 2.64
0855 S 116.725 114.643 2.082
0951 S 118.834 116.74 2.094
0952 S 118.362 117.624 0.738
0953 S 118.478 116.74 1.738
1050 S 120.73 119.283 1.447
1051 S 119.343 118.481 0.862
1755 S 115.253 113.348 1.905
1756 S 114.165 -99 -99
1757 S 113.912 111.76 2.152
1758 S 115.037 112.726 2.311
1851 S 115.283 113.558 1.725
1852 S 115.995 114.893 1.102
1853 S 116.887 115.058 1.829
1854 S 117.548 115.491 2.057
1855 S 117.024 115.372 1.652
1856 S 116.058 114.838 1.22
1951 S -99 -99 -99
1952 S -99 -99 -99
1953 S 117.707 116.03 1.677
2050 S 117.682 115.32 2.362
2051 S 117.963 116.884 1.079
2052 S 116.396 114.012 2.384
Manhole Reference Liquid Type Cover Level Invert Level Depth to Invert
Manhole Reference Liquid Type Cover Level Invert Level Depth to Invert
2150 S 115.45 113.51 1.94
2151 S 115.049 112.964 2.085
2153 S 116.067 115.253 0.814
2754 S 113.528 111.534 1.994
2755 S 115.009 113.072 1.937
2852 S 116.149 114.659 1.49
2853 S 116.39 115.034 1.356
2854 S 115.731 113.79 1.941
2855 S 115.698 114.086 1.612
2951 S 117.405 116.289 1.116
2952 S 118.209 117.194 1.015
2954 S 117.438 116.5 0.938
3050 S 116.817 114.329 2.488
3051 S 115.71 114.743 0.967
3756 S 115.343 113.793 1.55
3851 S 115.756 114.36 1.396
3852 S 115.579 113.802 1.777
4150 S 111.251 110.184 1.067
4754 S 113.93 -99 -99
4755 S 114.68 113.177 1.503
4756 S 114.601 113.891 0.71
4851 S -99 115.305 -99
4853 S 116.195 115.28 0.915
4854 S 115.616 114.268 1.348
4855 S 114.982 113.61 1.372
4951 S 116.975 116.289 0.686
4952 S 116.704 115.966 0.738
4953 S 116.24 114.945 1.295
4954 S -99 116.347 -99
5050 S 115.945 114.692 1.253
5051 S 115.506 113.677 1.829
5052 S 115.192 113.058 2.134
5150 S 113.47 112.428 1.042
5751 S 98.494 96.974 1.52
5850 S 114.022 111.864 2.158
5851 S 114.406 113.034 1.372
5950 S 115.366 113.793 1.573
6050 S 110.983 107.935 3.048
6150 S 107.005 105.938 1.067
6850 S 113.327 111.675 1.652
6851 S 111.705 109.776 1.929
6852 S 98.271 96.271 2
6950 S 115.402 112.354 3.048
6951 S 111.8 110.199 1.601
7757 S 97.294 92.224 5.07
7851 S 97.007 92.39 4.617
Manhole Reference Liquid Type Cover Level Invert Level Depth to Invert
1.3
denv
er™
pole
denver™ poleap
plic
atio
ns Landscaped areas
Car parks
Amenity areas
Retail parks
Entrance roads
Pedestrian areas
The Denver™ Pole Mount luminaire with its attractive
contemporary styling and exceptional performance
characteristics is unsurpassed in meeting modern
lighting design criteria for striking landscape illumination
at night, coupled with aesthetic appeal by day. The latest
control gear and lamp technology, coupled with a
precisely engineered anodised reflector, achieve
maximum performance and high efficiency. Compliance
with Night Time Friendy requirements is easily achieved
due to precise light control.
1.4
denv
er™
pole
amenity
features and benefits
Contemporary styling
> Unique aesthetic appeal to
complement today’s architecture
High quality construction
> Durability
> Fully Weather Sealed
Controlled upward light
> ‘Night Time Friendly’
Two light distributions
> Maximum efficiency and uniformity
for any application
Extensive choice of bracket permutations
> Unique appearance for every
application
> Flexibility of design
Tool-free access to lamp & gear tray
> Easy maintenance
< grange park school - northampton
lamp types included
35W - 150W metal halide (various)
70W - 150W high pressure sodium
32W - 42W compact fluorescent (twin lamp)
IP rating
IP657
approvals
Complies with EN60598
1.5
denv
er™
pole
short arm- 150mmlong arm - 400mm
0˚ version
5˚ version
600
10 Ø
250
200
200
190
330
short arm- 150mmlong arm - 400mm
515
60mm ø side entry bracket shown
DPS.WB - wall bracket
Photometric data is availableat www.holophane.co.uk
specification
The luminaire shall consist of a polycarbonatelens housed in an ABS alloy door arrangementwith a high pressure die-cast aluminium body,housing integral control gear to suit a wide rangeof high intensity discharge or compactfluorescent lamps. An acrylic lens shall beavailable as an option. The optical arrangementshall consist of an anodised aluminium reflectorand injection moulded polycarbonate or acryliclens. The door shall be secured to the body bytwo concealed latches providing tool free accessfor maintenance. The two sections shall besealed by a closed cell silicone gasket ensuringIP65 is maintained. The luminaire complies withEN60598 and has a range of complementarybrackets and column permutations available.
windage
Code
Denver™ Pole 0.1m2
Asymmetric (.AY)
Street (.NR)
weights & thermal data
Lamp Type Weight (kg) Min. Operating Max. AmbientTemperature (˚C) Temperature (˚C)*
70W High Pressure Sodium 7.1 -30 60100W High Pressure Sodium 7.8 -30 50150W High Pressure Sodium 8.5 -30 5035W CDMTF3 Metal Halide 7.1 -20 5570W CDMT3 Metal Halide 7.1 -20 75100W CDMT3 Metal Halide 7.8 -20 60150W CDMT3 Metal Halide 8.5 -20 5032W (Twin) Compact Fluorescent 5.6 -10 5042W (Twin) Compact Fluorescent 5.6 -10 50
* The maximum ambient temperatures stated are for exterior use only. For interior use deduct 10˚Cfrom the temperature stated. Note: For photocell options please deduct 15˚C for 100 & 150W types.
light distributions
denv
er™
pole
1.6
amenity
Asymmetric
Street
optical versatility
Two choices of optical arrangementsare available for the DenverTM Pole Mountluminaire, asymmetric & street.
Controlled directional light, minimising:
> Light pollution
> Light spill
> Discomfort glare
Precision engineered anodised semi-specularaluminium reflectors ensure either maximumlateral and forward distribution (streetdistribution), ideal for entrance roads, or anasymmetric distribution for car parks,pedestrian areas and retail parks. Both lightdistributions provide excellent uniformity.
easy maintenance
Internal component layout allows easy accessto all critical components. The control gear issecured to a removable geartray which can beeasily lifted out for maintenance purposes.
Tool-free latches allow quick andeasy access for maintenance.
Mains termination block
Reflector & lampholderarrangement
Control gear
Removable geartray
Door retaining strap
1.7
denv
er™
pole
denv
er™
pole
1.8
amenity
ordering details : luminaire
DPS.BLS
luminaire accessories order separately for on-site installation by othersCode
DPS.BLS Back-light Shield (for asymmetric only)
DPS.42 42mm Adaptor (reduces 60mm entry to 42mm)
Example
< milton keynes hospital subway - netherfield
CodeDPS Denver Pole
Code Lamp Type .70XT 70W Clear High Output HPS Lamp (E27) Base.100XT 100W Clear High Output HPS Lamp (E40) Base.150XT 150W Clear High Output HPS Lamp (E40) Base.35CDMTF3 35W Clear CDMT 3000K Metal Halide Lamp (G12) Base*.70CDMT3 70W Clear CDMT 3000K Metal Halide Lamp (E27) Base*.100CDMT3 100W Clear CDMT 3000K Metal Halide Lamp (E27) Base*.150CDMT3 150W Clear CDMT 3000K Metal Halide Lamp (E40) Base*.232PL4 32W Twin 4000K Electronic Compact Fluorescent 4-Pin Lamp**.242PL4 42W Twin 4000K Electronic Compact Fluorescent 4-Pin Lamp**
Code Light Distribution
.AY Asymmetric
.NR StreetCode 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
.A Acrylic Lens****
.C Enhanced Paint Finish
.T PhotocellDPS .150XT .AY .C9 .C
* All ceramic lamp circuits contain timed ignitors. **.NR distribution only. ***Please specify RAL colour reference. ****For 100W maximum.Note: Luminaires are supplied as standard for use on 240V 50Hz supply and complete with lamp.For 230V 50Hz add prefix ‘N’. Other voltages available onrequest.
0 Degree Wall Bracket
DPS.WB.C1 White
DPS.WB.C4 Graphite
DPS.WB.C6 Grey
DPS.WB.C7 Black
DPS.WB.C9 Metallic Silver
DPS.WB.RAL**** RAL Colour (customer choice)
5º all brackets are available. Configuration e.g DPS.5WB.C7
contactHolophanefor details
1.9
denv
er™
pole
column accessories
Example
Code Tubular Compartment Columns (DPSB)HELB.FS1 J-Anchor bolts for flange base, 3m to 5mHELB.FS2 J-Anchor bolts for flange base, 6m to 8mHEL.CBEPAC Cut Out Box and Earth Plate for Armoured Cable*
Code Conical Steel Columns (DPSC)HELC.FS1 J-Anchor bolts for flange base, 3m to 5mHELC.FS2 J-Anchor bolts for flange base, 6m to 8mHEL.CBEPAC Cut Out Box and Earth Plate for Armoured Cable*
*please contact Holophane for details
Code Mid Hinged Columns (DSPMH)HELMH.FS1 J-Anchor bolts for flange base, 4m to 5mHELMH.FS2 J-Anchor bolts for flange base, 6m to 8m.RLR4 Raise lower rope 4m-5m .RLR6 Raise lower rope 6m.RLR8 Raise lower rope 8m
Conical Aluminium Columns (DSPAC)HELAC.FS1 J-Anchor bolts for Flange Base, 3m to 5mHELAC.FS2 J-Anchor bolts for Flange Base, 6m to 8mHEL.CBEPAC Cut Out Box and Earth Plate for Armoured Cable*
rockingham park - corby >
ordering details : columns & brackets
CodeDPSB Denver Tubular Base Compartment ColumnDPSC Denver Steel Conical ColumnDSPAC Denver Aluminium Conical ColumnDSPMH Denver Steel Mid Hinged Column
Code Luminaire Mounting Height.3 3 metres*.4 4 metres.5 5 metres.6 6 metres.8 8 metres
Code Column Category please refer to page 24.15 for definition of the EN40 guidelines.LMZ For light & medium area wind zones (EN40 rationalised wind zones).HVZ For heavy area wind zones (EN40 rationalised wind zones).HEZ For extra heavy wind zones (EN40 rationalised wind zones)
Code Brackets.1L Single head long bracket.1S Single head short bracket.2L Twin head long bracket.2S Twin head short bracket
Code Bracket Style.A0 Angle at 0°.A5 Angle at 5°
Code Colour.C1 White (RAL 9016).C4 Graphite (RAL 7011).C6 Grey (RAL 7035).C7 Black (RAL 9005).C9 Silver (RAL 9006).RAL**** RAL Colour (customer choice)**
Code Optional Base Type please refer to page 24.1 for details, base is dependant on height and type of column
.FB1 Flange Base
.FB2 Flange BaseCode Optional Column Finish.P1 Black undercoat primed.P2 Undercoat primed
to match RAL colour specified Code Optional paint Finish
(Bracket Only).C Enhanced paint finish
DPSB .3 .LMZ .1S .A0 .C1 .FB1 .P1 .C
*not available with DPSMH. **Please specify RAL colour reference.
for decorativecolumns see
page 24.1
denv
er™
pole
1.10
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
BOOTHVILLE PRIMARY SCHOOL
ENVIRONMENTAL NOISE SURVEY
Acoustics Report A532/R06
18th 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/R06 18/10/2012
Boothville Primary School – Environmental Noise Survey
A532/R06 18th 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 ...................................................................................................... 8
7.1 BB93 External Noise Sources ........................................................................................... 8
7.2 Nursery Noise ................................................................................................................. 9
8 External Plant Noise Limits ..................................................................................................... 10
9 Summary .............................................................................................................................. 11
Boothville Primary School – Environmental Noise Survey
A532/R06 18th 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 Boothville 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 single story teaching block to the south east of the existing
main Boothville Primary School building. The new teaching block will likely comprise four
classrooms and associated ancillary circulation and accommodation space. The current
preferred location for the new block is shown in pink in Figure 1; possible alternative locations
are shown in blue. This report comments in principle on all locations in respect of external
noise but the survey covered only the preferred location.
Boothville Primary School – Environmental Noise Survey
A532/R06 18th October 2012 Page 2
Figure 1 – Proposed School layout and Survey Locations
3 Site and Surroundings
Boothville Primary School is in a predominantly residential area. The A5123 is the nearest
major trunk road, 285m to the north west of the preferred site. However, Booth Lane North is
25m to the east and also carries fairly significant and mostly continuous traffic. Other local
roads are less busy.
Most of the preferred site is screened from Booth Lane North by the existing nursery block.
While this reduces traffic noise levels its location does mean the new building will be exposed to
noise from the nursery play area. The nursery is a part of Boothville Primary School and
therefore, noise from it would be excluded from applicable noise limits in respect of BB93.
Attended Monitoring Location
3
Unattended Monitoring Location Monitoring Location
Nursery Playground
Boothville Primary School
A532/R06
Figure 2
4 The Building Regulations
Requirement E4 from Part E of Schedule 1 to The Building Regulations 2000
“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
its intended use.
Approved Document E provides further information on complying with the Building Regulations
and includes the following statement:
“In the
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
for the acoustic design of new schools.
“The overall objective of the performance standards in Section 1.1 is to provide acoustic
conditions in schools that (a) facilitate clear comm
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:
Boothville Primary School
A532/R06
Figure 2 – Arial Photograph:
The Building Regulations
Requirement E4 from Part E of Schedule 1 to The Building Regulations 2000
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
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 wi
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
for the acoustic design of new schools.
The overall objective of the performance standards in Section 1.1 is to provide acoustic
conditions in schools that (a) facilitate clear comm
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.
Boothville Primary School – Environmental Noise Survey
Arial Photograph: Showing noise sources
The Building Regulations
Requirement E4 from Part E of Schedule 1 to The Building Regulations 2000
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
its intended use.”
Approved Document E provides further information on complying with the Building Regulations
and includes the following statement:
Secretary of State’s view the normal way of satisfying Requirement E4 wi
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
for the acoustic design of new schools.
The overall objective of the performance standards in Section 1.1 is to provide acoustic
conditions in schools that (a) facilitate clear comm
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.
Environmental Noise Survey
18th
Showing noise sources
The Building Regulations and B
Requirement E4 from Part E of Schedule 1 to The Building Regulations 2000
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
Approved Document E provides further information on complying with the Building Regulations
and includes the following statement:
Secretary of State’s view the normal way of satisfying Requirement E4 wi
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
for the acoustic design of new schools.
The overall objective of the performance standards in Section 1.1 is to provide acoustic
conditions in schools that (a) facilitate clear comm
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.
Environmental Noise Survey
18th October 2012
Showing noise sources
Building Bulletin
Requirement E4 from Part E of Schedule 1 to The Building Regulations 2000
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
Approved Document E provides further information on complying with the Building Regulations
Secretary of State’s view the normal way of satisfying Requirement E4 wi
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
for the acoustic design of new schools. Section 1.1
The overall objective of the performance standards in Section 1.1 is to provide acoustic
conditions in schools that (a) facilitate clear comm
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.
Environmental Noise Survey
October 2012
ulletin 93 (BB
Requirement E4 from Part E of Schedule 1 to The Building Regulations 2000
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
Approved Document E provides further information on complying with the Building Regulations
Secretary of State’s view the normal way of satisfying Requirement E4 wi
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
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:
(BB93)
Requirement E4 from Part E of Schedule 1 to The Building Regulations 2000
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
Approved Document E provides further information on complying with the Building Regulations
Secretary of State’s view the normal way of satisfying Requirement E4 wi
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.”
BB93 should, therefore
states that:
The overall objective of the performance standards in Section 1.1 is to provide acoustic
unication 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:
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
by noise appropriate to
Approved Document E provides further information on complying with the Building Regulations
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.”
therefore, form the basis
The overall objective of the performance standards in Section 1.1 is to provide acoustic
unication 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:
Page 3
Each room or other space in a school building shall be designed and constructed in such a way
by noise appropriate to
Approved Document E provides further information on complying with the Building Regulations
ll 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.”
form the basis
The overall objective of the performance standards in Section 1.1 is to provide acoustic
unication of speech between teacher and
The BB93 standards and regulations are directly applicable to the following rooms and spaces:
Boothville Primary School – Environmental Noise Survey
A532/R06 18th October 2012 Page 4
• 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 nonCmandatory guidance only. The
LAeq,30min index is defined as the equivalent steadyCstate 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.
Boothville Primary School – Environmental Noise Survey
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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 hearingCimpaired
students (including speech
therapy rooms)
30 dB* 30 dB*
* C Note that no relaxation is permitted for these rooms
# C 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 hearingCimpaired 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.
Boothville Primary School – Environmental Noise Survey
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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 10th October 2012. All
measurements were external. The measurement locations are shown in 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 assess 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 nonCtypical noise.
The survey took place on a normal school day; therefore, the attended sound level meter was
paused during periods of school outdoor activity. However, activity noise from the nursery play
area was almost continuous throughout the day and severely disrupted measurements.
An attempt was made to make some measurements after the nursery had closed.
Unfortunately, noise from the afterschool gardening club had an impact on these later
measurements and at 16:47 the school fire alarm was tested. As the primary nonCschool
activity noise source is road traffic noise, measurements were stopped before the start of the
rush hour at 17:00. The continuous school activity noise during and after normal teaching
hours led to very few successful measurements and none that were totally free of school
activity noise.
Boothville Primary School – Environmental Noise Survey
A532/R06 18th October 2012 Page 7
6.2 Measurements
Measurements at the attended monitoring location were made in octave frequency bands using
a SVANTEK 947 sound level meter. Measurements were generally in 10 minute intervals;
however, some were cut short by interruption. The attended monitoring location was
completely screened from Booth Lane North by the existing nursery block; noise levels
measured here represent the majority of the proposed new teaching block, i.e. all facades
except the southern façade.
A SVANTEK 955 logging sound level meter was setup at the unattended location. This was only
partially screened by the nursery block and is representative of noise levels incident on the
southern façade of the proposed new teaching block. Unfortunately, an equipment failure led
to no data being recovered from this meter. However, the unattended SVANTEK 955 was
attended for some periods and traffic noise levels at this location were noted by observation of
levels on the screen.
Both meters were calibrated using a Brüel & Kjær 4231 calibrator before and after the
measurement period. No drift in the calibration level was noted.
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: 2.5 m/s
Wind direction: Easterly
There was no precipitation and weather conditions were conducive to successful noise
monitoring.
6.4 Results – External Noise Levels
The measured noise levels for the attended monitoring location are given in Table 2, below.
Table 2 – Attended Noise Survey Results
Start Time Duration (seconds)
LAeq, dB
LA01, dB
LA90, dB
10/10/2012 11:40 00:08:04 53.0 65.5 43.5 excess school activity noise
10/10/2012 11:59 00:10:00 49.4 57.6 44.1
10/10/2012 12:11 00:09:45 54.3 64.8 46.0 excess school activity noise
10/10/2012 16:00 00:10:00 51.0 60.3 46.4
10/10/2012 16:13 00:09:44 50.5 58.3 46.2
10/10/2012 16:34 00:10:00 51.7 61.4 46.1 fire alarm (paused too late)
10/10/2012 16:46 00:10:00 50.5 57.3 46.5
Summary: (Average/Minimum)1 50.4 60.3 43.5
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.
Boothville Primary School – Environmental Noise Survey
A532/R06 18th October 2012 Page 8
The measurements reported in Table 2 are those which were the least affected by school
activity noise during more than 3 hours of attended measurement; however, they were still
affected to some extent by minor distant school activity. Measurements in red have been
excluded from the average for the reason stated. From these measurements the average LAeq
noise level was 50.4 dB. In the absence of all school activity noise this would have been
slightly lower. The ambient noise climate at this location was dominated by continuous but
discrete vehicle movements on Booth Lane North.
Although the meter at the unattended location failed to log, traffic noise levels at this location
were recorded in the survey notes. Road traffic noise levels were consistently 2 dB to 3 dB
higher than those at the attended position because of less screening provided by the existing
nursery building at this location. Therefore, it is expected that the road traffic noise levels
would have been around LAeq 52C53 dB at the most exposed location of the proposed building.
As the dominant offCsite noise source is Booth Lane Road to the east, noise levels at the
alternative location to the west of the existing main school building are likely to be lower than
measured at the preferred site. The alternative site which is closer to booth lane road would be
exposed to noise levels significantly in excess of the previously stated limit for natural
ventilation via openable windows of 50dB LAeq and if this location is chosen noise should be
considered when planning the layout and ventilation strategy.
The noise of activity on the school site is excluded from the BB93 requirements. However, the
dominant noise source affecting the preferred location of the building is from outdoor nursery
noise. During the site visit this occurred for relatively long periods of time, and certainly during
periods when the school would be expected to be teaching internally. The noise from the
nursery is discussed separately below.
7 Implications for Ventilation
7.1 BB93 External Noise Sources
The intention is to naturally ventilate the proposed building. Based on the proposed layout
shown in Figure 3 the reception classroom to the north of the building, and other rooms with
windows in the north, west and east façade only, will be exposed to external noise levels of
50dB LAeq from offCsite noise sources during normal school hours, increasing to around LAeq 53
dB on the south facade.
Boothville Primary School – Environmental Noise Survey
A532/R06 18th October 2012 Page 9
Figure 3 – Proposed Layout in Preferred Location
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 35C38 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 which would just comply the LAeq 40 dB limit on three facades obtained by applying the
5dB relaxation allowable under BB101 for naturally ventilated school buildings.
However, using basic natural ventilation with openable windows would result in an exceedance
of the BB93/BB101 limits in the three classrooms with windows in the south façade from road
noise alone.
7.2 Nursery Noise
BB93/BB101 internal noise limits do not apply school activity noise. However, if the nursery
remains operational as it was during the noise survey, most classrooms in the proposed
teaching block will have extremely unsatisfactory acoustic conditions. At the attended
monitoring location noise levels from the nursery play area consistently exceeded 65dBA LA01
and 55dB LAeq. The external noise level would be around LAeq 55C60 dB typically depending
upon the activity.
Boothville Primary School – Environmental Noise Survey
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The measurement location was further from the nursery play area than the proposed southern
façade and therefore actual noise levels incident on the building will be higher. In addition,
noise from young children at play and nursery staff could be considered to be particularly
distracting to children in class and may also have a greater masking effect on teachers’ voices
than traffic noise, reducing speech intelligibility.
Unfortunately, times when the nursery outside play area is likely to be in use coincide with
times when higher levels of ventilation are required. Therefore, if the nursery is to remain
operational, we would recommend that openable windows or other unattenuated ventilation
should not be used for ventilation in the southern façade. As the building is single story,
natural ventilation may be possible through other means, for example via attenuated wind
scoops (eg windcatchers) on the roof. The glazing and façade construction should be
considered at a later design stage to ensure they will provide adequate protection from nursery
noise.
If the nursery is not to remain operational in its present form then adequate attenuation of
Booth Lane North road noise can just about be achieved with openable windows but these
should be side hung casement windows with the hinges to the east to provide some protection
when the windows are open. Alternatively an alternative performance standard could be
sought as described in section 5.2.
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 43 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.
Boothville Primary School – Environmental Noise Survey
A532/R06 18th October 2012 Page 11
Ideally this should be specified in octave bands but if assessed on ACweighted 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 limit would therefore be LAr 33 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 48 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 Boothville Primary School in
Northampton. The dominant offCsite noise source affecting the school is Booth Lane North.
Environmental noise levels incident on the southern façade of the proposed building on the
preferred site, from road noise alone will be slightly over LAeq 50 dB. Based on this, the
proposed natural ventilation design could achieve appropriate internal noise levels provided the
suggested mitigation is adhered to. However, there is significant noise from the nursery
outdoor playground and we would recommend that if the new block were to remain in its
current location, then attenuated ventilation should be provided.
Boothville Primary School – Appendix A
Photos
A532/R06 18th October 2012 Page B1
Primary Monitoring Location
Boothville Primary School – Appendix B
Octave Band Survey Data
A532/R06 18th October 2012 Page B1
Primary Measurement Location ( Octave Band Data
63 Hz 125 Hz 250 Hz 500 Hz 1000 Hz 2000 Hz 4000 Hz 8000 Hz
10/10/2012 11:40 00:08:04 53.0 58.2 50.0 46.3 47.7 50.2 46.2 37.8 29.3
10/10/2012 11:59 00:10:00 49.4 57.2 53.1 44.5 43.8 46.6 41.7 34.8 30.7
10/10/2012 12:11 00:09:45 54.3 57.3 52.7 47.7 47.6 50.6 49.0 40.3 32.6
10/10/2012 16:00 00:10:00 51.0 61.6 59.4 51.1 48.4 46.2 39.2 32.9 29.0
10/10/2012 16:13 00:09:44 50.5 58.7 52.6 46.7 45.3 47.6 42.7 36.6 28.1
10/10/2012 16:34 00:10:00 51.7 60.2 56.4 51.2 48.4 48.5 41.4 31.9 25.5
10/10/2012 16:46 00:10:00 50.5 58.9 56.2 46.1 45.1 48.2 40.8 34.3 25.2
Start Time Duration (seconds) LA eq, dBLeq, dB