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Regulation 8
[SCHEDULEN.I.Groundwater Threshold Values
This schedule has no associated Explanatory Memorandum
[Table 1
Threshold values for assessing groundwater chemical status
Parameter | Unit | To examine if groundwater abstraction is causing saline or other intrusions | To examine if groundwater is providing a significant contribution to the failure of the environmental objectives of associated surface water bodies | To examine if the quality of groundwater that is abstracted for potable use is deteriorating, possibly resulting in a need for increased purification | To examine the spatial extent of a groundwater body or group of bodies that are exceeding an EU Standard or threshold value |
---|
|
|
Ammonium | mg/l | | | | 0.29 |
Arsenic | μg/l | | | | 7.5 |
Atrazine | μg/l | | | | 0.075 |
Cadmium | μg/l | | | | 3.75 |
Chloride | mg/l | 25 | | | |
Electrical Conductivity | μS/cm | 800 | | 1875 | |
Lead | μg/l | | | | 7.5 |
MCPA | μg/l | | | | 0.075 |
Mecoprop | μg/l | | | | 0.075 |
Mercury | μg/l | | | | 0.75 |
Nitrate (as NO3) | mg/l | | | 37.5 | 37.5 |
Nitrite | μg/l | | | 375 | 375 |
Simazine | μg/l | | | | 0.075 |
Sulphate | mg/l | | | | 187.5 |
Tetrachloroethylene | μg/l | | | 7.5 | 7.5 |
Trichloroethylene | μg/l | | | 7.5 | 7.5 |
Any pollutant in relation to which a surface water environmental standard has been set | | | 0.5 x (surface water standard divided by dilution factor) | | |
Table 2
Threshold values for assessing the risk to wetlands
Column header | Annual mean nitrate concentration (mg/l NO3) |
---|
| Altitude Above Ordnance Datum |
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Wetland type | up to 175 metres | more than 175 metres | any |
---|
Quaking bog | 18 | 4 | |
Wet dune | | | 13 |
Fen (mesotrophic) and Fen Meadow | 22 | 9 | |
Fen (oligotrophic and wetlands at tufa forming springs) | 20 | 4 | |
Wet grassland | 26 | 9 | |
Wet heath | 13 | 9 | |
Peatbog and woodland on peatbog | | | 9 |
Wetland directly irrigated by spring or seepage | | | 9 |
Swamp (mesotrophic) and reedbed | | | 22 |
Swamp (oligotrophic) | | | 18 |
Wet woodland | 22 | 9] | |
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