Comment

Representation ID: 55751

Received: 05/10/2020

Respondent: Brookgate

Agent: Bidwells

Neutral:
The Arup Odour Report concluded that overall the range of evidence available from
all the various reported modelling studies, as well as the Arup study, indicate that
odour levels on the proposed development site would be below the levels generally
considered to have a low risk of adverse odour impacts. The report was based on a
further, more detailed odour analysis of the potential for odours at the development
site at Cambridge North in response to the Odournet report. Anglian Water
collaborated with Arup in terms of inputting into the report and agreed with the
methodology adopted within the report.
The conclusions of the Arup Odour Report are as follows:
“A qualitative Source Pathway Receptor assessment concludes that the proposed
development site would have a Low to Moderate risk of adverse odour impacts.
This is because the development site is more than 400-800m from the more
odorous parts of CWRC meaning odours which allows for dispersion and hence
dilution of the odours released.
Overall the range of evidence available from all the various reported modelling
studies and this study indicate that odour levels on the proposed development site
would be below the levels generally considered to have a low risk of adverse odour
impacts. The only exception is the Odournet study which appears to have made
some very pessimistic assumptions and the results can only be replicated by nearly
doubling the measured odour emission rates on site.
The evidence from modelling studies is further supported by the evidence form the
Source, Pathway, Receptor qualitative approach and the sensory assessments.
Odour complaints are received at a frequency of once a year (and some are
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received in areas where all studies would suggest that there is a risk of adverse
odour impacts) and the evidence from sniff testing is consistent with the modelling
studies undertaken by Arup, Anglian Water and CERC”
A number of reports have been commissioned on the potential for odour in
connection with the CWRC, all of which have reached consistent findings as the
Arup Odour Report detailed above, with the exception of the Odournet Report
which has far higher readings.
The evidence from these reports collectively is clear and this allows the LPA to
confidently take informed decisions.