Good Morning Chris,
TPH is commonly used and widely understood and as both yourself and Paul have pointed out, there's no major issue with the word at all. As I see it, the ISO standard just recommends a minor update to the language we use to be more precise where we can be (i.e. just getting rid of the word 'total'). A similar example might be the use of 'permanent gases' instead of 'bulk gases' for ground gas monitoring.
In the case of WM3, they've defined the TPH range and are specifically only referring to the total measurable concentration with no attempt to split into fractions or speciate - so in that respect their use of the term TPH is spot on.
Regards,
Mark Hamill, BSc, MSc, MIEnvSc
Senior Engineer
01244 288 200
INFRASTRUCTURE AND ENERGY
Geotechnical House, 18-19 Drome Road, Deeside Park, Deeside, Flintshire, CH5 2NY.
www.socotec.co.uk
-----Original Message-----
From: Contaminated Land Management Discussion List [mailto:[log in to unmask]] On Behalf Of Chris Dainton
Sent: 17 July 2018 19:01
To: [log in to unmask]
Subject: Re: TPH definition
Hello Mark
- TPH appears 38 times in WM3 V1.1 2018 (Chrome browser text search).
- TPH as a C6 to C40 range is defined on page 29.
- PHC doesn't make an appearance.
Clearly NRW/SEPA/NiEA/EA didn't get the memo about 2017 BS EN ISO 11504.
Testing - a lot of labs report speciated TPH fractions in the range >C5-C36, which further adds to the mix.
It may be that under Steps 1.2 to 1.5 of App D Waste Sampling, one may be able to justify/document using reduced banding (e.g. C10-C40) based on what is known about the nature of the petroleum hydrocarbons potentially in the waste.
Chris Dainton
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