Good points Steve,
I agree, from all the work I have done
in
I suppose they technically class as
background, even though they are ultimately from anthropogenic sources.
So I suppose in one sense it still
classes as contamination per se and therefore should be remediated if
considered a risk at this level, but it would be interesting to see if you
could actually make that case and what evidence a regulator would want to
justify it. It should come into consideration during the DQRA phase when
producing the site specific numbers and remediation justification, and given
the details probably should in areas like
But looking at the basic numbers, the residential
SGV for BaP in urban areas (near major roads) should be considered to be at
least 7?
Regards,
Chris Swainston
Principal Engineer
The Geotechnical Centre
Tel: 02476 694664 Direct Dial: 02476
629013
Email: [log in to unmask]
From:
Contaminated Land Management Discussion List [mailto:
Sent: 19 November 2014 11:41
To:
Subject: Re: Interesting paper on
organic pollutants in
This study confirms
what I found out many years ago at a site in north
This then leads to
the question – is there any point remediating PAH below the levels that
are likely to be caused by current air pollution, or indeed below those caused
by historical air pollution that is so widespread?
Steve
From:
Contaminated Land Management Discussion List [mailto:
Sent: 19 November 2014 10:35
To:
Subject: Interesting paper on
organic pollutants in
Dear all,
I think the group might be interested in a recent paper
we’ve published. Among other things it is an example of the use of the NBC
methodology at a regional scale for PAH and PCB in soil. It is open access and
attached, with a link below to its source.
The abstract of the paper follows:
“Surface soils from a 19 km2 area
in east London, UK were analysed for polycyclic aromatic hydrocarbons (PAH) and
polychlorinated biphenyls (PCB) (n = 76). P16 PAH ranged from 4 to 67 mg/kg
(mean, 18 mg/ kg) and P50 PAH ranged from 6 to 88 mg/kg (mean, 25 mg/kg). P7
PCB ranged from 1 to 750 lg/kg (mean, 22 lg/kg) and Ptri-hepta PCB ranged 9 to 2600
lg/kg (mean, 120 lg/kg). Compared to other international cities concentrations
were similar for PAH but higher for PCB. Normal background concentrations (NBC)
were calculated and compared to risk-based human health generic assessment
criteria (GAC). Benzo[a]pyrene NBC for urban (6.9 mg/kg), semi-urban (4.4
mg/kg) and urban + semi urban (6 mg/kg) domains exceed residential (1 mg/kg)
and allotment (2.2 mg/kg) LQM/CIEH GAC (at 6% SOM) and the
Indeno[1,2,3-cd]pyrene NBC for urban (6.8 mg/kg) and urban + semi-urban (5.2
mg/kg) domains exceed the residential (4.2 mg/kg) LQM/CIEH GAC (at 6%
SOM).”
Best wishes,
Darren Beriro
Medical Geology
Environmental Modelling
British Geological Survey
Tel: 0115 936 3100
(ext. 3479)
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