Following onsite assessments, and ongoing liaison with air quality and remediation specialists, Telford Homes submitted revised remedial strategy for the Wallis Road site. This strategy was reviewed by London Legacy Development Corporation (LLDC), London Borough of Hackney (LBH) and Public Health England (PHE).
We have been given approval by the LLDC to recommence full excavation works.
As part of our commitment to the minimise disruption to our neighbours, a robust schedule of air monitoring will be maintained throughout the works.
A series of passive air monitors are currently located around the site, at Mossbourne School and at two residential receptor locations. Three PID monitors are on the site boundary and a fourth PID monitor is on Wallis Road.
The PID monitors provide the site team with instant readings of Volatile Organic Compounds (VOCs) which are used to assess concentrations on site against our adopted precautionary threshold. The results of the PID monitor located on Wallis Road will be uploaded daily on this page of our website. Further ‘real-time’ sampling of ambient air will also be undertaken as necessary during the works.
The boundary threshold that will be adopted for VOCs has been selected to be comfortably below human health thresholds and protective of ‘nuisance’ odours. It has been derived in consultation with the LLDC, who have been advised by ARUP, Public Health England and LB Hackney.
Air monitoring will help us to control site works and identify when pre-emptive measures to mitigate odours are necessary.
These measures include, but are not limited to:
- Reducing the size of the area being worked on
- Covering up the soil
- Temporarily stopping works.
The groundworks contractor, in liaison with our specialist consultants, will implement these measures as and when they are deemed necessary.
Below is a log of daily air monitoring readings.
The reports from February to March 2019 show readings during the 10 day work programme to successfully remove the spoil heap.
The readings from May 2019 onwards show monitoring during the excavation works on the site, which recommenced on 7 May 2019. Daily monitoring will continue during these excavation works.
If you require further information regarding the project please visits the FAQ’s page, you can also sign up for updates here.
For further information about the product being used to neutralise the smell at the site boundary, please click on the file below: LCH Material safety data sheet.pdf
MOST RECENT DAILY REPORTS
Air quality monitoring resumed on 18th November prior to the commencement of the remaining excavation works.
An engineer from RSA Geotechnics Limited is on site for the duration of active excavation works to oversee the independent monitoring of the air quality at the site boundary on behalf of Telford Homes. LB Hackney Pollution Control Officers are also on site frequently with engineers from ARUP, who advised LLDC on the remediation strategy.
Site monitoring during active excavation works includes real-time measurement of volatile organic compounds (VOCs) at the site boundary and on Wallis Road; this is to ensure that we continue to work within the agreed safe thresholds. The thresholds were agreed with LLDC, who have been advised by ARUP, Public Health England and LB Hackney, and there is regular communication between the monitoring engineer and the groundworks manager.
We will continue to assess the results of the air monitoring, and as before, the daily results from the Wallis Road monitor and the weekly passive tube monitoring will published on the Wallis Road website.
The monitoring conducted to date has been compliant with the remediation strategy agreed by LB Hackney and LLDC, with concentrations of key determinants comfortably below the adopted thresholds.
Whilst bulk excavation works on site were paused, air quality monitoring was suspended as of 4th September 2019. RSA Geotechnics dismantled and removed the monitoring equipment from site. Passive air monitoring tubes around the site perimeter, Mossbourne School and the other offsite receptor locations were collected on 5th September 2019 for laboratory analysis.
Excavation works for the service corridor (approximately 5% of the site) started 19th November 2019 with the air monitoring resuming on 18th November 2019.
Works were paused for a second time on 4th December 2019 due to high levels of groundwater and odour issues. Works and air monitoring resumed on 29th January 2020.
A series of passive air monitors are located around the site, at Mossbourne School and at two residential receptor locations. Three PID monitors on the site boundary and a fourth PID monitor on Wallis Road are used to provide the site team with instant readings of VOCs which are used to assess concentrations at the site boundary against our adopted precautionary threshold.
This was undertaken during the soil heap removal and during the excavation works to date and will be maintained for further excavation works.
Further ‘real-time’ sampling of ambient air was undertaken during the soil heap removal works and the bulk excavation works, and will be undertaken as necessary during ongoing excavation works so that the controls remain suitably protective.
The test results from the passive monitors are reported weekly to the LLDC & LB Hackney for review. The reports and the daily results from the PID monitor on Wallis Road have been published on the air monitoring page of this website. https://www.telfordwallisroad.co.uk/air/
Yes - the boundary threshold for volatile organic compounds was selected to be comfortably below human health thresholds and protective of ‘nuisance’ odours.
The threshold was agreed in consultation with the LLDC, who have been advised by ARUP, Public Health England and LB Hackney.
Yes - the weekly results from the passive monitoring and the daily results from the Wallis Road monitor are uploaded to the air monitoring page of the project website. https://www.telfordwallisroad.co.uk/air/
If you feel unwell it is recommended that you contact your GP or call the NHS 111 phone number.
MOST RECENT WEEKLY REPORTS