Measuring flare flow

If anyone can help with th ETS Dir 2003/87/EC regarding measuring and monitoring flare gas .
the most important parts are the appendixes 2 regarding accuracy and Monitoring plan by users
Your help as usual will be real appreciate.
Please share methods of flare measurement methods

Here are two examples:
[url]http://www.fluidcomponents.com/Articles/Flare-Gas-EU-Emissions-0113.pdf[/url]
[url]http://www.allison.co.uk/wp-content/uploads/2013/04/ST110.pdf[/url]