L Maxwell
Contaminated Land Officer
Development Directorate
The Killingworth Site
P.O.Box 113
Station Road
Killingworth
Newcastle upon Tyne
NE12 6WJ
Tel. 0191 219 2488
Fax. 0191 219 2457
Unless stated, opinions, conclusions and other information expressed in
this message are personal, and not those of North Tyneside Council.
----- Forwarded by Lisa Maxwell/Regulatory Services/ERH/ntc on 13/11/2007
09:39 -----
[log in to unmask]
gov.uk To: Lisa Maxwell/Regulatory Services/ERH/ntc@ntc
cc:
06/11/2007 18:20 Subject: iron silicate vs coal fines
Hello Lisa,
Thanks for your mail. I read iron silicate as Fe2SiO4 (Fayalite), and coal
fines as pieces of mined coal less than 2 inches (say 5mm) in diameter.
I'm not sure if every variety of coal fine would necessarily float on
water.
Possible tests that would demonstrate the difference-
Iron silicate would scratch glass, coal fines would not.
Iron silicate would be nearly twice as dense as coal (to demonstrate that,
a specific gravity test would be helpful. Part of that test requires an
investigator to work out the weight of the sample material).
Coal fines may very well be combustible, though iron silicate not.
Fayalite has a white streak* where coal fines have a black streak.
*mineralogical term to mean the colour given by a trail of material when
the material is scraped across a rough, usually white porcelain surface.
Hope this helps
Gavin Day
Contaminated Land
LB Newham
Alice Billings House
2-12 West Ham Lane
Stratford
London
E15 4SF
Tel: 020 8430 3816
Fax: 020 8430 4434
-----Original Message-----
From: Contaminated Land Management Discussion List
[mailto:[log in to unmask]]On Behalf Of Lisa
Maxwell
Sent: 06 November 2007 16:00
To: [log in to unmask]
Subject: Re: Sink float tests
Hello all
Quick background, we have a complainant who insists that refurbishment work
of a viaduct has led to pollution of the surrounding land (his words) and
was insistent that the iron silicate shot used to remove paint is still on
site in significant amounts. The site was cleaned during works adhering to
best practicable means and again at the completion of works, which as a
result of the complainant included a scrape of surface material
replacement of topsoil in some areas.
2 years down the line from the original complaint the complainant is still
insistent that there is an issue and despite numerous meeting on site with
other parties involved has made very clear his complete "lack of faith in
the council". A recent site visit with senior management and the
complainant still has not resolved this.
Now to the muppet question, having a site investigation (both labs and GI)
and consultancy background before moving to local authority (plus the
necessary post graduate degree) i am very confidant that the material the
complainant is referring to is infact coal fines within the glacial till,
however the complainant is unwilling to acknowledge the councils technical
ability to reach this conclusion.
Therefore I need a test that could prove that the material in question is
in fact coal fines and not iron silicate. I was thinking along the lines
of a float sink test so any confirmation of this or any alteratives would
be greatly appreciated. (its been over 10 years since i last carried out
this test so I'm a bit woolly as to what it entails).
Yours in anticipation
Lisa
L Maxwell
Contaminated Land Officer
Development Directorate
The Killingworth Site
P.O.Box 113
Station Road
Killingworth
Newcastle upon Tyne
NE12 6WJ
Tel. 0191 219 2488
Fax. 0191 219 2457
Unless stated, opinions, conclusions and other information expressed in
this message are personal, and not those of North Tyneside Council.
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