Air Quality Control during construction of the National Children’s Hospital

Air Quality

According to the EIS report carried out by the National Children’s Hospital, Construction dust has the potential to cause local impacts through dust nuisance at the nearest sensitive receptors (including hospital buildings).

In addition to construction dust, there is the potential for Aspergillus impacts to occur. Construction activities such as excavation, earth moving and backfilling may generate quantities of dust, particularly in dry and windy weather conditions. While dust from construction activities tends to be deposited within 200 m of a construction site, the majority of the deposition occurs within the first 50 m

The extent of any dust generation depends on the nature of the dust (soils, peat, sands, gravels, silts etc.) and the nature of the construction activity. In addition, the potential for dust dispersion and deposition depends on local meteorological factors such as rainfall, wind speed and wind direction. Vehicles transporting material to and from the site also have the potential to cause dust generation along the selected haul routes from the construction areas

Operational Phase – Air Quality

There is the potential for a number of emissions to the atmosphere during the operational phase of the development. In particular, the traffic-related air emissions may generate quantities of air pollutants such as NO2, CO, benzene and PM10. The energy requirements of the site from boilers and generators may also give rise to some air emissions.

Climate

There is the potential for a number of greenhouse gas emissions to atmosphere during the operational phase of the development. Road traffic and space heating of buildings may give rise to CO2 and N2O emissions. There is the potential for a number of greenhouse gas emissions to atmosphere during the construction of the development. Construction vehicles, generators etc., may give rise to CO.

Vehicles (including HGV’s and LGV’s) travelling to and from the site during the construction phase have the potential to cause dust nuisance at nearby sensitive receptors. The receptors modelled represent the worst-case locations close to the proposed development and were chosen due to their close proximity (within 200 m) to the road links which will be impacted by the addition of construction traffic during the construction phase of the proposed development.

The traffic data used in this assessment was provided by Arup Consulting Engineers. Worst case speeds i.e. peak hour speeds were applied to the applicable road links.

PM10 concentrations are well within the annual limit value at all worst-case receptors. In addition, the 24-hour PM10 concentration of 50 μg/m3 , which can only be exceeded 35 times per year within the limit, is found to be in compliance at all receptors. The greatest number of exceedances are predicted to be 2 days per year at each receptor. Annual average PM10 concentrations are at most, 46% of the limit value, at the worst-case receptor. PM2.5 concentrations at all worst-case receptors are well below the limit value of 25 μg/m3 . The annual average PM2.5 concentration peaks at most, 48% of the limit value, at the worst-case receptor.

National Childrens’ Hospital /BAM Noise Survey for Davitt Road

Survey Periods

Attended noise measurements were conducted at Locations DR1 to DR2 over the course one survey period as follows:

Daytime 09:30hrs to 12:30hrs Wednesday 4 February 2015

Unattended noise measurements were conducted at Location DR1 over a 5 day period to obtain a measurement of noise levels over the day and night-time periods both midweek and at the weekend.

The survey was conducted over the following survey period: · Wednesday 4 February to Monday 9 February 2015

The daytime measurements represent a typical period that was selected in order to provide a snapshot of the existing noise climate, with the primary purpose being to ensure that the proposed noise criteria associated with the development are commensurate with the prevailing environment.

The night-time period provides a measure of the lowest existing background noise levels. The weather during the attended survey periods was dry and bright with a breeze of less than 1m/s. The weather during the unattended survey periods was mixed with some periods of rain, however, the majority of survey periods were dry with wind speeds less than 5m/s.

Personnel and Instrumentation

Leo Williams (AWN) conducted the measurements and installed the unattended noise meters. Noise measurements were conducted using a Brüel & Kjær Type 2260/2238 Precision Sound Level Analyser. The measurement apparatus was check calibrated both before and after each survey using a Brüel & Kjær Type 4231 Sound Level Meter Calibrator.

Results and Discussion

The internal survey results are summarised in Table 1 The survey results for the unattended meter at location DR1 are summarised in Table 11.5.

Table 11.4: Summary of Davitt Road attended noise monitoring results

Table 11.5: Summary of Davitt Road unattended noise monitoring results

Receiver locations in the noise model

  • DR01 Residential Dwelling Galtymore Road
  • DR02 Residential Dwelling Galtymore Road
  • DR03 Residential Dwelling Galtymore Road
  • DR04 Residential Dwelling Galtymore Road
  • DR05 Residential Dwelling Galtymore Road
  • DR06 Residential Dwelling Galtymore Road
  • DR07 Residential Dwelling Galtymore Road
  • DR08 Residential Dwelling Galtymore Road
  • DR09 Residential Dwelling Carrow Road
  • DR10 Residential Dwelling Carrow Road

Estimated construction noise levels near Davitt Road compound site

Figure 11.14: Predicted noise levels at Davitt Road compound site

The free field external construction noise levels are well below 70dB LAeq,1hr for all residential locations assessed. In fact the predicted construction noise levels are of a similar order of magnitude to the existing background noise levels. It is therefore concluded that the activity on the Davitt Road compound is unlikely to generate a significant noise impact. Notwithstanding this, consideration should be given to the mitigation measures discussed in detail in Section 11.1.6.1 in order to minimise the impact.

Predicted Impact of Construction Traffic

Similarly access to the Davitt Road Compound will be from the Davitt Road. While there are no residential properties in the immediate vicinity of the entrance to the Davitt Road compound site there are some residential properties located along the Davitt Road where construction traffic will pass by. The nearest dwellings on Davitt Road are also approximately 5m from the centreline of the road.

Davitt Road construction traffic assumes a cumulative impact of both the traffic using the Davitt Road compound and also a proportion of the traffic accessing the main site via the Davitt Road.

NPH Waste Management Plan

You can view The National Childrens’ Hospital Waste Management Plan here;

https://www.nchplanning.ie/wp-content/uploads/2015/07/Chapter-10-Waste-Managment.pdf

National Childrens’ Hospital Traffic Plan incorporating Davitt Road

The Old Unilever Site is now being used as a Supplies Depot for building equipment for The National Childrens’ Hospital. We have attached a copy of their Traffic Plan during construction which includes the transit of HGVs to and from St James’s Campus.

https://www.nchplanning.ie/wp-content/uploads/2015/07/Chapter-6-Traffic.pdf

Davitt Road Traffic

Sources: Powerscar Datalogic and National Paediatric Hospital Sources

In October 2014 a Traffic Study of Davitt Road carried out by the Planning Department of the National  Childrens’ Hospital Planning Office showed peak times of;

07:30 – 08:30 am    815 vehicles per hour

14:30 – 15:30 pm     786 vehicles per hour

16:00 – 17:00 pm     Total average of 2,200 cars in peak hours periods.

On average 9,000 vehicles drive along Davitt Road between 07:30 am to 19:30 pm

  • 130 trucks enter and depart the SJH Campus daily,
    • The majority of these are travelling to/from Davitt Road – HSE – Unilever Site.
      • Some turn right along Davitt Road towards Suir Bridge or Herberton Bridge,
      • Others turn left and travel along Inchicore via Kilmainham to Mount Brown.

Projected hourly flow of traffic from the Ambulance Bay on Davitt Road

  • AM Peak Times – 18 ambulances per hour
  • PM Peak Times – 10 ambulances per hour
  • 60% generated traffic entering/ leaving from Davitt Road East
  • 40% generated traffic entering/ leaving from Davitt Road West

The distribution of trips reflects that all transfer trips travel east towards the campus and material delivery trips arrive from the west.