Nik,
We have used SNIFFER to calculate SSACs for a range of parameters.
However with B{a)P I think that care is required when using SNIFFER.
SNIFFER does not include a dermal uptake pathway, but incorporates a
check to identify whether dermal is likely to be significant. The check
indicates that dermal uptake is significant for B(a)P. Therefore we
have also incorporated a number of additional calculations which are
based upon data published in CLR10 and CLEA Briefing Note 1.
It is my guess that if your haulier has calculated a threshold of 7mg/kg
B(a)P, he has not included all the potential exposure pathways. Our
assessment procedure for apartments, which is based upon residential
exposure, without up-take from vegetables, also indicates a SSAC between
1mg/kg and 2 mg/kg B(a)P.
Trust this helps
Rob Ashby
Consulting Group Manager
Enviros Consulting
Tel 0161 874 3656
Mob 07800 624 013
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-----Original Message-----
From: Contaminated Land Management Discussion List
[mailto:[log in to unmask]] On Behalf Of Nik
Reynolds
Sent: 08 February 2006 15:39
To: [log in to unmask]
Subject: Benzo(a)pyrene
We are currently reviewing the threshold proposals for topsoil for
importation onto one of our clients sites. Normally we specify between
1
and 2mg/kg depending upon the proposed landuse, however we have been
informed by our clients haulier that we are too conservative and an
acceptable threshold of 7mg/kg for apartments is possible using a
modified
SNIFFER assessment. We do acknowledge that obtaining these low
parameters
is extremely difficult and does result in the rejection of much imported
material.
If this is so, fantastic, however thought i'd see if anyone has come
across
this?
We have seen a risk assessment for 10mg/kg, however found that the index
dose had been incorrected inputed.
Appreciate any assistance any one can give. Maybe this could start to
become part of the threshold banding to be used in the real world!!!!
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