The road to Hell is paved with Brent's good intent (or asphalt)

 

Recent paving in the Barn Hill Conservation area - why not Mapesbury?

A Mapesbury resident who is a retired Civil and Structural Enginer (MIStructE and MICE) has carried out a pavement survey of Dartmouth Road where Brent Council wishes to replace the paving in this Conservation Area road with asphalt.

The survey has been forwarded to the  Council and members of the Mapesbury Residents Association.

The works have been temporarily suspended giving time for  review and it is hoped that in the light of the Council's Climate Emergency Declaration an assessment will be made of the comparative carbon footprint of renewing broken paving compared with taking paving up and replacing with asphalt.

Dartmouth Road Pavement Survey.

Carbon footprint of proposed replacement of paving slabs by asphalt

Date:  20.11.19

This report is based on a detailed survey of the pavements on both sides of Dartmouth Road:

A:  between nos. 103 to 131

B:  between nos. 60 – 92

Which is ¼ of the length of Dartmouth Road.

C:  between nos. 1 – 24.  This last section has recently been repaved and is in excellent order.  See appendix for the survey results for this section.

Pavements are on average 2700 mm. wide and are formed using 600 x 750 and 600 x 600 precast concrete paving slabs. The width consists of two of each size staggered: 

(2 x 750 ) + ( 2 x 600 ) = 2700.

Each property is approx. 10 m wide and so there are theoretically 16 ½ x 4 = 68 slabs per property. But many properties have vehicle crossovers which reduces the number of slabs. The crossovers are either of concrete or block paving construction or a mix of one of these plus paving slabs.  There are also a very few tarmac crossovers.

Where trees occur the paving is extended upto the tree or there is a resin gravel type infill upto the tree, or occasionally tarmac or nothing with the soil visible. Whatever has been installed next to the tree has usually failed in some way and is uneven.  These areas have the most trip hazards.

Concrete and concrete block vehicle crossovers have performed best and are often in good serviceable order. Any area of crossovers that is surfaced with paving slabs is in poor condition with on average over 1 / 3 of the paving slabs cracked.

Good condition slabs .			Cracked slabs .
Between crossovers	At vehicle crossovers	Total	Between crossovers	At crossovers	Total
1540	243	1783	129	72	201
			% of total 129/1540= 8.3 %	% of total 72 / 243= 29.6%
Whole length of Dartmouth Road pro-rata  (i.e. x 132 / 32 )
6350	1000	7350

It can be seen that paved crossovers contribute nearly 4 times the rate of cracking that occurs  in areas between crossovers.

It can also be seen that within crossovers there are 243 – 72 = 171 uncracked slabs which is comfortably more than the 129 cracked slabs within the paved areas between crossovers. So when the defective crossovers are replaced there will be sufficient uncracked slabs recovered to replace all the cracked slabs between the crossovers.

We can extrapolate this detailed survey to the whole of Dartmouth Road because a visual inspection indicates that the area surveyed in detail here is of the same configuration as the whole of Dartmouth Road and the total figures for the whole road are shown in the table. 

The plan proposed by Brent Council is to remove all the paving and replace the crossovers with block paving and to infill between the crossovers using asphalt.

Therefore the number of paving slabs to be removed from between crossovers and dumped is 6350 slabs.  The slabs are 50mm thick

The average weight of a slab is (.6m x .675m x .05m) x 2000 kg / m cube = 40.5 kg

Therefore the weight of slabs to be removed = 6350 x 40.5 / 1000 = 257 tons. These slabs have to be lifted, piled up and then grab loaded onto a lorry and taken to a dump. Such loading will achieve about 10 tons per typical 8 wheel lorry giving rise to 26 lorry movements. And the dumping will attract landfill tax. More seriously, these slabs will remain in landfill unchanged for centuries.

Asphalt requires a well compacted base layer of stone which will have to be imported because the sand / soil / clay found under the existing slabs when lifted will need improvement. 

The area of new asphalt will be the same as the paving removed = 6350 x 0.6 x 0.675 = 2570 m square. 

Allow for a restored formation thickness of 75mm, this will require the removal of 75mm of existing soft material ( to maintain existing levels) and reinstatement using 75 mm of stone material. So the volume of material removed and replaced will be 2 (1 removal and one replacement) x 2570 x 0.075 = 385 m cube = 770 tons. Which at 15 tons per lorry for this type of material gives rise to 51 lorry movements.

The amount of asphalt required if 20mm thick will be 2570 x .02 = 51 m cube = 100 tons at least, requiring another 10 lorry movements.

So the total weight of materials being lifted and moved is 257 + 770 + 100 = 1,127 tons requiring 26 +5 1 + 10 = 87  lorry movements. 

The lorries will have to travel to a dump outside London and the asphalte and stone will have to be brought in from a quarry, also well outside London.  This represents a lot of diesel at 10 mpg! And this is just Dartmouth Road. For the whole of Mapesbury Estate there will be at least 6 x these quantities, i.e nearly 7,000 tons of materials dumped or imported, involving 500 plus lorry movements. 

Furthermore, since Brent plans to change all the pavements in the Borough for asphalt, the quantities will become huge.

It is obvious that the proposed use of asphalt to replace existing slab paving is totally unacceptable on carbon foot print grounds for material handling and transport and the energy intensive manufacture of the asphalt itself, which is a heavy crude oil hydrocarbon based product. Levelling the slabs in situ would have minimal carbon foot print and lead to a pleasing durable solution appropriate for a Conservation Area. 

Appendix:  P

Appendix:

The section of Dartmouth Road between Mapesbury Road and Exeter Road has also been surveyed in detail as follows. This section was re-laid using slabs 5 years ago and is in very good condition and shows how successful slab paving can be when well laid.

Survey on Dartmouth Road between numbers 2 and 14 and the opposite odd numbers side which is in equally good condition
Good condition slabs .			Cracked slabs .
Between crossovers	At crossovers	Total	Between crossovers	At crossovers	Total
1043	No paved crossovers, all are conc. or blocks or tarmac	1043	19 *	No paved crossovers, all are conc. or blocks or tarmac	19
			% of total 19/1043 = 1.8 %		% of total 19/1043 = 1.8 %

About half of these cracked slabs are so finely cracked it is difficult to see the crack because they have not moved having been very well laid.

This table applies to only 15 % of Dartmouth Road and so would not affect the pro-rata totals used above very much and in fact further support the case for retaining all the existing paving in Dartmouth Road.

Brent's Interim Climate Emergency Plan - is it enough?

Monday's Full Council Meeting will be presented with Brent Council's Interim Climate and Ecological Emergency Action Plan. This needs to be seen in the context of the Council declaring a Climate Emergency and the setting up on a Climate Assembly  and the recent  consultation on climate change actions concluded last week. The wider context is of course the global climate crisis and at street level issues such as the Mapesbury asphalting of walkways controversy and the community battle to save mature trees in Furness Road.

The Report going to the Council Meeting sets out the following framework which is elaborated in the Action Plan. There has already been criticism that the detailed actions, whilst welcome, are not sufficiently radical and joined up across the Council and such criticisms are likely to be raised at Wednesday's Round Table meeting at Brent Civic Centre which is discussing a Brent bid to the National Lottery Climate Action Fund. 

Community leadership: As the democratically accountable body, we will provide the necessary leadership on this issue to bring the community together to address this issue with a positive and collaborative agenda, ensuring that the carbon neutral transition is fair for all.

Leading by example as a council: Reducing emissions from our own estate and   operations (corporate properties, vehicle fleet, street lighting/signage), from council housing and from our construction programmes; improving the environmental sustainability of the Council’s procurement of goods and services, reducing our dependence on damaging materials such as single use plastics.

Strategic planning and infrastructure:  Ensuring that environmental sustainability goals are fully integrated in strategic plans such as the Borough Plan, Local Plan, Inclusive Growth Strategy, Housing Strategy, Transport Strategy, Parking Strategy, Waste Strategy, Digital Strategy, Joint Strategic Needs Assessment. Creating better recycling, walking and cycling infrastructure; supporting green enterprise and reskilling the workforce; delivering borough-wide decentralised energy schemes including community owned renewable generation.

Partnership: Developing pan-London and cross-borough initiatives where these can improve our impact. Build on existing and create new partnerships with key sectors in Brent including public sector partners, business and industry, energy suppliers, schools, residents’ fora and community groups.

Attracting investment: Ensuring that Brent secures funding from existing and future national and regional programmes for carbon reduction, energy efficiency, waste reduction, air quality, sustainable urban drainage, biodiversity and tree planting.

Enabling: Making it easier for people in Brent to reduce their own impacts, for instance, allocating the Carbon Offset Fund for household, business, school and community carbon reduction initiatives.

Community engagement: Providing direct advice, for instance on recycling, and signposting residents to advice and support from other agencies such as the Energy Saving Trust.

ACTION PLAN (click bottom left for full size version) 

Street meeting on Furness Road street tree removal Tuesday 26th November

After the uproar that arose when residents found out that Brent Council was about to remove 11 mature trees in Furness Road, five of which were outside the Furness Primary School playground, Brent Council has arranged a street meeting outside the school for 5pm on Tuesday 26th November.

The tree removal was postponed while the council reconsidered the issue.

The meeting will include local residents, Brent officers, ward councillors and the lead member for the environment Cllr Krupa Sheth.

People intending to attend should email chris.whyte@brent.gov.uk to confirm their attendance.

It is possible that the venue may be moved to somewhere more conducive to a discussion so please watch this space,

Help plant 250 trees in One Tree Park tomorrow!

Predictable comment but I haven't had my second coffee of the morning yet...    I expect they will have to rename it 'Twohundredandfiftyone Tree Hill.'  Great stuff after the Brent Council tree removal controversy.

From Wembley Central and Alperton Residents' Association

WCARA will be holding another tree planting event this year. Planting over 250 trees in One Tree Hill Park on Saturday 23rd November between 2:30 pm and 3:30pm.

We will be joining many other community groups during the National Tree Week whic is the UK's largest annual tree celebration, marking the start of the winter tree planting season.
Trees do so much for us every day. They give us oxygen, store carbon, improve air quality, conserve water, preserve soil, support wildlife and are a key solution to climate change. They also make our communities more beautiful and improve our wellbeing.

But trees need our help now. We need to champion them, by planting many more trees and caring for the ones we already have, to ensure a green, tree-filled future.

National Tree Week is an opportunity for everyone to plant a tree and help ensure a tree-filled future. So dig out your sturdy boots, grab a spade and become a Tree Champion today!

Green candidate calls on Brent Council to review Mapesbury asphalt & Furness trees decisions

William Relton, Green Party  parliamentary candidate for Brent Central is calling on Brent Council to review two actions that were due to be implemented on Monday morning in the night of its Climate Emergency Declaration. William said,

Quite why this is happening so soon after The Climate Emergency Declaration was made is quite staggering.The Climate Emergency Declaration must be more than a public relations stunt. It will only have credibility if residents can see that it affects Brent Council’s every environmental action. I support Mapesbury residents concerned about the detrimental environmental impact of asphalt replacing paving in Dartmouth Road and the people of Furness Road who have managed to delay the cutting down of trees in their road, five of which are outside Furness Primary School. Both cases indicate that the Council is prevented by a bureaucratic interpretation of its own guidelines in making sensible decisions that contribute to   the fight against climate change. 

I call on Brent Council to review both decisions and ensure that all such actions are seen through the lense of the Climate Emergency Declaration. Coincidentally I responded in the comments section of the CED specifically about Brent needing to implement a large scale tree planting programme, and this removal of healthy trees seems to be completely at odds with its own policy.

Roe Green Strathcona strike again to save jobs

When talks with Brent's Strategic Director of Children and Families on Tuesday evening failed to win a guarantee of no compulsory redundancies, NEU members at Roe Green Strathcona decided to take a sixth day of strike action today.

Jobs are threatened following Brent Council's decision to implement a phased closure of the Strathcona Site.

The NEU is asking for funding to enhance voluntary redundancy, retrain staff and to pay the existing staff who will be deployed at the main site in the expectation they will gradually leave for new jobs.

Public urged to support the Roe Green Strathcona staff on strike today

NEU staff at Roe Green Strathcona School will be on strike today following the failure of attempts to negotiate an arrangement with Brent Council that would avoid compulsory redundancies and facilitate redeployment from the Strathcona site to the main Roe Green Infants site.

Striking staff will be demonstrating outside Brent Civic Centre from 8am to 9am this morning. This will be the sixth strike in a campaign that initially started to stop the closure of Strathcona but following confirmation of the Labour Council's decision has now moved to protecting jobs.

Battles over school closures were last prominent in the 1970s when the number of pupils in schools fell.The strike is significant because it will set a precedent for how closures are handled by local authorities. It is thought that closures are likely in some of Brent's neighbouring boroughs. Falling pupil numbers are likely to be affected by movement out of the UK by some European families in the event of Brexit.

'If not now, when?' Read the Green Party's radical Manifesto here - '

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