Will,
I am not sure arsenic has been derived that way in the model. It says
on page four that SGV based on comparison of oral and dermal exposure
routes with the oral ID only. Therefore, by looking at the oral HCV
only you get 32.4mg/kg for residential (I assume rounded down by the EA
to 32mg/kg).
Of more interest maybe is the justification for not using the inhalation
HCV (such as the killer dust pathway), based on the low exposure
contribution (<0.1%), even though the risk when taking account
inhalation tox is about 28%. This could be used for contaminants where
inhalation is not a primary pathway and inhalation effects not of
primary concern
Nickel SGV for example has not been done this way. It has a low
combined contribution for inhalation, but the effects of inhalation are
separate to other pathways and therefore treated independently.
Interesting times :)
Paul
Dr Paul Quimby
Senior Environmental Consultant
www.thelkgroup.com
thelkgroup.com | sapcalc.com | code4homes.com | invasiveplantcompany.com
Carbon Neutral Company
Manchester Office T: 0161 763 7200
Liverpool Office T: 0151 235 8716
Glasgow Office T: 0141 773 6269
------------------------------------------------------------------
PLEASE CONSIDER THE ENVIRONMENTAL IMPACT OF PRINTING THIS EMAIL
------------------------------------------------------------------
This e-mail and the information it contains may be privileged and/or
confidential. It is for the intended addressee(s) only. The unauthorised
use, disclosure or copying of this e-mail, or any information it
contains is prohibited and could, in certain circumstances, be a
criminal offence. This email and its contents do not necessarily reflect
the views of the company, and no liability is accepted for its content.
Although an active anti-virus policy is operated, the company accepts no
liability for any damage caused by any virus transmitted by this e-mail,
including any attachments. If you are not the intended recipient please
notify the sender immediately and delete the message from your system.
Thank you.
-----Original Message-----
From: Contaminated Land Management Discussion List
[mailto:[log in to unmask]] On Behalf Of Wills
Gareth
Sent: 12 May 2009 16:03
To: [log in to unmask]
Subject: Re: New Soil Guideline Values - Arsenic, Nickel......
The EA have made some strange decisions...
To replicate the values, the arsenic SGV is based on comparison of oral,
dermal and inhalation exposure with the oral ID (NOT inhalation ID).
For nickel, it's more confusing. Residential and commercial SGV are
based on comparison of inhalation exposure with inhalation TDI ONLY.
Allotments bsaed on comparison of oral, dermal and inhalation exposure
against oral TDI ONLY.
Phew.
Gareth Wills
Project Manager, Communities
44-(0)117 9339 335
Think before you print
-----Original Message-----
From: Contaminated Land Management Discussion List
[mailto:[log in to unmask]] On Behalf Of Kevin
Privett
Sent: 12 May 2009 16:03
To: [log in to unmask]
Subject: Re: New Soil Guideline Values - Arsenic, Nickel......
I don't like to mention this, but I cannot replicate these values with
the data given in the SGV reports.
Regards,
Kevin Privett.
Dr Kevin Privett
Geo-Environmental Associate
Hydrock
Over Court Barns, Over Lane, Almondsbury, Bristol BS32 4DF
Tel:+44 (0)1454 619 533 Fax:+44 (0)1454 614125 Cell phone: +44 (0)7799
430870
Email: [log in to unmask]
-----Original Message-----
From: Contaminated Land Management Discussion List
[mailto:[log in to unmask]] On Behalf Of Chris
Dainton
Sent: 12 May 2009 11:01
To: [log in to unmask]
Subject: Re: New Soil Guideline Values - Arsenic, Nickel......
New values with old values in brackets
Arsenic:
Res: 32 (20)
Res w/o PU: No value (20)
Allot: 43 (20)
Com: 640 (500)
Nickel:
Res: 130 (50)
Res w/o PU: No value (75)
Allot: 230 (50)
Com: 1,800 (5,000)
Scanned by MailDefender - managed email security from intY -
www.maildefender.net
Scanned by MailDefender - managed email security from intY -
www.maildefender.net
___________________________
NOTICE: This communication and any attachments ("this message") may
contain confidential information for the sole use of the intended
recipient(s). Any unauthorized use, disclosure, viewing, copying,
alteration, dissemination or distribution of, or reliance on this
message is strictly prohibited. If you have received this message in
error, or you are not an authorized recipient, please notify the sender
immediately by replying to this message, delete this message and all
copies from your e-mail system and destroy any printed copies.
|