FYI
Aamer Raza
Associate Director
Harrison Group Environmental
Kimberley Street,
Norwich, Norfolk, NR2 2RJ
Phone: 01603-613-111
Email [log in to unmask]
-----Original Message-----
From: aamerraza
Sent: 12 January 2009 15:23
To: 'Chris People'; [log in to unmask]
Subject: RE: Microbiological Limits in Soil?
Hello Chris,
I have done a number of projects in this area - there are no health
based limits for soil as far as I know - the key is to assess the land
use, and evaluate the condition relative to background. If you are
looking at agricultural land, particularly grazed pasture, you could
encounter high background levels of total or faecal coliforms in the 100
- >1000 cfu/g range (or higher), due to animal manure and droppings. If
you are assessing a sewage release, Where soil has clearly been impacted
by sewage, the levels will be substantially higher, typically in the
10,000 - 1,000,000 cfu/g range, though these would be expected to
attenuate with time (5 - 6 weeks being typical). In non impacted gardens
and other non-agricultural soils, the levels should be in the 1 - <10
cfu/g. In my judgment, qualitatively, if you are consistently finding
levels >100 cfu/g in non agricultural garden areas, then this is
indicative of an impacted area, subject to appropriate background
comparisons etc., and could warrant further consideration.
Hope this is helpful.
Aamer Raza
-----Original Message-----
From: Contaminated Land Management Discussion List
[mailto:[log in to unmask]] On Behalf Of Chris
People
Sent: 12 January 2009 12:43
To: [log in to unmask]
Subject: Microbiological Limits in Soil?
Happy new year everyone.
Can anyone point me in the right direction of any limits for faecal
indicators/colliforms in soil such as E Coli etc? So far I've not been
able to
find anything for soil and the HPA have not been able to help.
Any help gratefully received, thanks,
Chris
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