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A piezometer sample involves taking a spot sample of your phreatic table.
The aim is to check the impact of your activity on the phreatic table.
The samples are taken under COFRAC accreditation, in accordance with FD T 90-523-3.
Technically speaking, the samples are taken in the piezometers (or small boreholes) on your site.
The site must have at least two piezometers, including one upstream and one downstream, to enable a comparison of the results and an assessment of the impact of your activity.
These samples are taken using small submerged pumps that can reach depths of up to 80 metres. After purging the stagnant water from the piezometer several times, a sample is collected and analysed in our laboratory. The quantity of water purged will depend on the depth of the structure and on the water level.
As with the 24-hour assessments, the frequency of this kind of check depends on the classification of your facility or your category. It can be annual, quarterly or monthly.
Verification of the quality of the phreatic table in order to determine the impact of the industrial activity. This kind of check is generally conducted using a control well (piezometer).
Checking the phreatic table is not systematically requested by the authorities (the Auvergne-Rhône-Alpes Regional Directorate for the Environment, for example).
Treatment stations and industrial facilities classified for environmental protection for ICPE. Any industrial or agricultural facility likely to generate risks or cause pollution or harm, particularly to the health and safety of residents, is a classified facility.
Frequency of phreatic table sampling
The frequency of checks can vary depending on the establishment’s activity and its classification (authorisation or declaration), but also on the geographic area. It is mainly biannual, but quarterly checks are also possible.
The frequency of checks can vary depending on the establishment’s activity and its classification (authorisation or declaration), but also on the geographic area. It is mainly biannual, but quarterly checks are also possible.
The samples are taken under COFRAC accreditation, in accordance with the FDT90-523-3 and NF 31-615 standards.