Table 4: Field QC samples
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| Quality control sample | Recommended number of samples | Use |
|---|---|---|
|
Blind replicate sample |
1 for every 10 samples collected |
All sampling |
|
Split samples* |
1 for every 20 samples collected |
Site validation / possible problem identified |
|
Rinsate blank |
1 per analysis matrix per piece of equipment per day |
DQO dependent |
|
Trip blank |
1 per consignment** of samples for organics or volatiles |
Generally used for water sampling only - DQO dependent |
|
Field blank |
1 per consignment of samples for organics or volatiles |
* See also sections 4.5.3 and 5.4.3.
** A consignment is a group of samples transported to the laboratory at the same time.
