![](images/btn_new.jpg) | Term | Definition |
![](images/btn_edit.gif) | Air | Sample taken from the atmosphere |
![](images/btn_edit.gif) | Benthic zone | Ecological region at the lowest level of a body of water, including the sediment surface and some sub-surface layers. |
![](images/btn_edit.gif) | Flowback water | A mixture of formation water and hydraulic fracturing injectates deriving from oil and gas wells prior to placing wells into production |
![](images/btn_edit.gif) | Groundwater | Sample taken from water located below the surface of the ground, such as from a well or spring |
![](images/btn_edit.gif) | Injection water | Water injected into a well or borehole prior to collection of flowback or production water. |
![](images/btn_edit.gif) | Municipal waste water | Sample taken from raw municipal waste water stream. |
![](images/btn_edit.gif) | Not Relevant | Sample medium not relevant in the context of the measurement |
![](images/btn_edit.gif) | Other | Sample medium other than those contained in the CV |
![](images/btn_edit.gif) | Precipitation | Sample taken from solid or liquid precipitation |
![](images/btn_edit.gif) | Production water | Fluids produced from wells during oil or gas production which may include formation water, injected fluids, oil and gas. |
![](images/btn_edit.gif) | Seawater | Observation or sample from a sea or ocean |
![](images/btn_edit.gif) | Sediment | Sample taken from the sediment beneath the water column |
![](images/btn_edit.gif) | Snow | Observation in, of or sample taken from snow |
![](images/btn_edit.gif) | Soil | Sample taken from the soil |
![](images/btn_edit.gif) | Soil air | Air contained in the soil pores |
![](images/btn_edit.gif) | Soil water | the water contained in the soil pores |
![](images/btn_edit.gif) | Storm water | Sample collected from stormwater, runoff generated by precipitation, or stormwater systems |
![](images/btn_edit.gif) | Surface water | Observation or sample of surface water such as a stream, river, lake, pond, reservoir, ocean, etc. |
![](images/btn_edit.gif) | Suspended particulate matter | Particulate matter entrained in the water column |
![](images/btn_edit.gif) | Tissue | Sample taken from the tissue of a biological organism |
![](images/btn_edit.gif) | Tree | Sample taken from a tree. |
![](images/btn_edit.gif) | Unknown | The sample medium is unknown |
![](images/btn_edit.gif) | Wastewater effluent | sample is from wastewater treatment plant effluent that is going directly into a stream |
![](images/btn_edit.gif) | Wellhead Gas | Gas taken from a wellhead under positive pressure |