Dutch values are NOT conservative.
particularly for organics and carcinogenics.
generally I would reject them out of hand.
from memory. They use
1. lifetime exposure levels.
2. very high varbon content of soil.
-----Original Message-----
From: Christiaan Wilkinson [mailto:[log in to unmask]]
Sent: 21 January 2005 11:18
To: [log in to unmask]
Subject: Rejection of Dutch Intervention Values
Hello All,
Before I take a new stance on the use of the Dutch Intervention Values in
GQRA could you give me some feedback on my thoughts.
Thanks,
Christiaan
Lancaster CC
Recent publication of the first organic SGV's (Toluene & Ethylbenzene)
show that the Dutch values contain large variations in their values. For
example, the current DVI for Toluene in soil is 339 mg kg-1. If this were
adjusted from 10% soil organic matter to 2.5% the intervention value would
be 84.8 mg kg-1. The Dutch have recently proposed to replace the human
health IV with new Serious Risk Concentrations (SRC) guidelines. The
proposed SRC for Toluene is 32 mg kg-1. The proposed SRC is a ten-fold
decrease from the current DVI. (SGV 15, 2004)
A further example of DVI variance is also in evidence in SGV16
(Ethylbenzene). Current DVI for Ethylbenzene in soil is 50mg kg-1. The
corrected soil organic matter from 10% to 2.5% would be 12.5 mg kg-1 which
is a factor of two lower. However, the proposed SRC is 111mg kg-1 which
shows a two-fold increase.(SGV 16, 2004)
UK policy requires the assessor to adopt the most conservative approach
when carrying out a Tier 1-risk assessment. The guidelines used must
be "appropriate, authoritative and scientifically based" (DETR Circular
02/2000). Based on this policy and the above evidence the LA does not view
the Dutch Intervention Values as being appropriate or authoritative.
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