In the vicinity of a rock cavern for which SGU is responsible and which has previously been used as an oil storage facility, fire drills have been carried out. The fire drills have resulted in the groundwater being contaminated with PFAS. The groundwater now seeps into the cavern, from where it is pumped up with two pumps and discharged to a recipient via an oil separator. Today, there is no other purification of the groundwater other than the purification that takes place in the oil separator. SGU has therefore developed a description of a simple purification plant for the purification of PFAS. The cavern is located in Köping with facility no. 1 147.

SGU estimates that approx. 10-33 m3/day using two pumps, which together can pump a maximum of 10 m3/hour. On rare occasions, 55 m3/day is pumped, i.e. the expected flow to be treated amounts to an average of approx. 0.5-2.5 m3/h. According to a report from 2015, 31 m3/day is pumped, which results in an average annual water volume of 11400 m3/1/, which is in line with the result.

The pumped amounts of water vary both on a daily level and probably also over the year. How much they vary is not known because there is no information about the variation. The current pumping system has neither digital flow meters nor a continuous collection of data. The pumps are controlled by level gauges and therefore do not run continuously.