Results of Monitoring at Olkiluoto in 2018, Hydrogeochemistry

Teea Penttinen, Anneli Wichmann, Kyösti Ripatti, Jorma Nummela, Elina Yli-Rantala, Laura Wendling, Sami Partamies, Tiina Lamminmäki, Petteri Pitkänen, Marja Vuorio, Reetta Ylöstalo

Research output: Book/ReportReport

Abstract

Possible changes in the chemical environment in shallow and deep groundwaters caused by construction of the final disposal facility are monitored on a regular basis. This report presents the annual hydrogeochemical monitoring results and observations for 2018.

The effect of works on ground surface was seen in analysis results of many groundwater pipes. Elevated sulfate concentrations were detected in OL-PP56 and OL-PVP17, which are located between the site of the Encapsulation plant and and the previously built parking area, in OL-PVP42A and OL-PVP42B located on the construction site of the encapsulation plant. Increasing sulfate concentrations were also seen in the upper part of ONKALO (ONK-KR1, ONK-KR2, ONK-KR3). In the shallowest sampling section of OL-PP56 and in OL-PVP42A pH decreased clearly from the values of the previous year. In the points between Olkiluoto main road (Olkiluodontie) and Natura nature reserve, OL-PVP4A and OL-PP2, the long increased salinity (TDS) values had remained stable since 2016. Infiltration from Korvensuo water reserve affected the composition δ18O ja δ2H isotopes in the water of OL-PVP12 and OL-PVP30.

Changes that in most cases are related to the hydraulic gradient caused by open underground spaces were observed in deep groundwaters. Downward movement of sulfate rich groundwater along either hydrological zones (BFZ045, HZ056) or open drillhole (OL-KR45, open from 2007–2015) was seen in elevated sulfide concentrations. Dilution of the water in HZ20 structure was still detected. In an intersecting sampling section of OL-KR4 an increase in sulfate was seen, respectively. Elevated sulphate concentrations were observed also in the underground monitoring points at the final disposal depth. Dilution of ONK-PVA2 continued and changes in ONK-KR4 and ONK-PVA1 were stabilised. Gas samples collected with PAVE and PFL devices corresponded to previus gas sampling results from Olkiluoto. Instead, samples collected with SWA technique indicated lower gas contents.

Sampo electromagnetic soundings were not carried out in 2018 because the broken device could not be fixed during the year.
Original languageEnglish
PublisherPosiva
Number of pages171
Publication statusPublished - 16 Dec 2019
MoE publication typeD4 Published development or research report or study

Publication series

SeriesPosiva Working Report
Number2019-44

Fingerprint

hydrogeochemistry
sulfate
monitoring
groundwater
encapsulation
sampling
dilution
gas
parking
nature reserve
water
infiltration
pipe
sulfide
isotope
road
hydraulics
salinity

Keywords

  • hydrogeochemistry
  • final disposal facility
  • ONKALO
  • monitoring
  • groundwater
  • gas sampling
  • analysis results

Cite this

Penttinen, T., Wichmann, A., Ripatti, K., Nummela, J., Yli-Rantala, E., Wendling, L., ... Ylöstalo, R. (2019). Results of Monitoring at Olkiluoto in 2018, Hydrogeochemistry. Posiva. Posiva Working Report, No. 2019-44
Penttinen, Teea ; Wichmann, Anneli ; Ripatti, Kyösti ; Nummela, Jorma ; Yli-Rantala, Elina ; Wendling, Laura ; Partamies, Sami ; Lamminmäki, Tiina ; Pitkänen, Petteri ; Vuorio, Marja ; Ylöstalo, Reetta. / Results of Monitoring at Olkiluoto in 2018, Hydrogeochemistry. Posiva, 2019. 171 p. (Posiva Working Report; No. 2019-44).
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abstract = "Possible changes in the chemical environment in shallow and deep groundwaters caused by construction of the final disposal facility are monitored on a regular basis. This report presents the annual hydrogeochemical monitoring results and observations for 2018.The effect of works on ground surface was seen in analysis results of many groundwater pipes. Elevated sulfate concentrations were detected in OL-PP56 and OL-PVP17, which are located between the site of the Encapsulation plant and and the previously built parking area, in OL-PVP42A and OL-PVP42B located on the construction site of the encapsulation plant. Increasing sulfate concentrations were also seen in the upper part of ONKALO (ONK-KR1, ONK-KR2, ONK-KR3). In the shallowest sampling section of OL-PP56 and in OL-PVP42A pH decreased clearly from the values of the previous year. In the points between Olkiluoto main road (Olkiluodontie) and Natura nature reserve, OL-PVP4A and OL-PP2, the long increased salinity (TDS) values had remained stable since 2016. Infiltration from Korvensuo water reserve affected the composition δ18O ja δ2H isotopes in the water of OL-PVP12 and OL-PVP30.Changes that in most cases are related to the hydraulic gradient caused by open underground spaces were observed in deep groundwaters. Downward movement of sulfate rich groundwater along either hydrological zones (BFZ045, HZ056) or open drillhole (OL-KR45, open from 2007–2015) was seen in elevated sulfide concentrations. Dilution of the water in HZ20 structure was still detected. In an intersecting sampling section of OL-KR4 an increase in sulfate was seen, respectively. Elevated sulphate concentrations were observed also in the underground monitoring points at the final disposal depth. Dilution of ONK-PVA2 continued and changes in ONK-KR4 and ONK-PVA1 were stabilised. Gas samples collected with PAVE and PFL devices corresponded to previus gas sampling results from Olkiluoto. Instead, samples collected with SWA technique indicated lower gas contents.Sampo electromagnetic soundings were not carried out in 2018 because the broken device could not be fixed during the year.",
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Penttinen, T, Wichmann, A, Ripatti, K, Nummela, J, Yli-Rantala, E, Wendling, L, Partamies, S, Lamminmäki, T, Pitkänen, P, Vuorio, M & Ylöstalo, R 2019, Results of Monitoring at Olkiluoto in 2018, Hydrogeochemistry. Posiva Working Report, no. 2019-44, Posiva.

Results of Monitoring at Olkiluoto in 2018, Hydrogeochemistry. / Penttinen, Teea; Wichmann, Anneli; Ripatti, Kyösti; Nummela, Jorma; Yli-Rantala, Elina; Wendling, Laura; Partamies, Sami; Lamminmäki, Tiina; Pitkänen, Petteri; Vuorio, Marja; Ylöstalo, Reetta.

Posiva, 2019. 171 p. (Posiva Working Report; No. 2019-44).

Research output: Book/ReportReport

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AU - Penttinen, Teea

AU - Wichmann, Anneli

AU - Ripatti, Kyösti

AU - Nummela, Jorma

AU - Yli-Rantala, Elina

AU - Wendling, Laura

AU - Partamies, Sami

AU - Lamminmäki, Tiina

AU - Pitkänen, Petteri

AU - Vuorio, Marja

AU - Ylöstalo, Reetta

PY - 2019/12/16

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N2 - Possible changes in the chemical environment in shallow and deep groundwaters caused by construction of the final disposal facility are monitored on a regular basis. This report presents the annual hydrogeochemical monitoring results and observations for 2018.The effect of works on ground surface was seen in analysis results of many groundwater pipes. Elevated sulfate concentrations were detected in OL-PP56 and OL-PVP17, which are located between the site of the Encapsulation plant and and the previously built parking area, in OL-PVP42A and OL-PVP42B located on the construction site of the encapsulation plant. Increasing sulfate concentrations were also seen in the upper part of ONKALO (ONK-KR1, ONK-KR2, ONK-KR3). In the shallowest sampling section of OL-PP56 and in OL-PVP42A pH decreased clearly from the values of the previous year. In the points between Olkiluoto main road (Olkiluodontie) and Natura nature reserve, OL-PVP4A and OL-PP2, the long increased salinity (TDS) values had remained stable since 2016. Infiltration from Korvensuo water reserve affected the composition δ18O ja δ2H isotopes in the water of OL-PVP12 and OL-PVP30.Changes that in most cases are related to the hydraulic gradient caused by open underground spaces were observed in deep groundwaters. Downward movement of sulfate rich groundwater along either hydrological zones (BFZ045, HZ056) or open drillhole (OL-KR45, open from 2007–2015) was seen in elevated sulfide concentrations. Dilution of the water in HZ20 structure was still detected. In an intersecting sampling section of OL-KR4 an increase in sulfate was seen, respectively. Elevated sulphate concentrations were observed also in the underground monitoring points at the final disposal depth. Dilution of ONK-PVA2 continued and changes in ONK-KR4 and ONK-PVA1 were stabilised. Gas samples collected with PAVE and PFL devices corresponded to previus gas sampling results from Olkiluoto. Instead, samples collected with SWA technique indicated lower gas contents.Sampo electromagnetic soundings were not carried out in 2018 because the broken device could not be fixed during the year.

AB - Possible changes in the chemical environment in shallow and deep groundwaters caused by construction of the final disposal facility are monitored on a regular basis. This report presents the annual hydrogeochemical monitoring results and observations for 2018.The effect of works on ground surface was seen in analysis results of many groundwater pipes. Elevated sulfate concentrations were detected in OL-PP56 and OL-PVP17, which are located between the site of the Encapsulation plant and and the previously built parking area, in OL-PVP42A and OL-PVP42B located on the construction site of the encapsulation plant. Increasing sulfate concentrations were also seen in the upper part of ONKALO (ONK-KR1, ONK-KR2, ONK-KR3). In the shallowest sampling section of OL-PP56 and in OL-PVP42A pH decreased clearly from the values of the previous year. In the points between Olkiluoto main road (Olkiluodontie) and Natura nature reserve, OL-PVP4A and OL-PP2, the long increased salinity (TDS) values had remained stable since 2016. Infiltration from Korvensuo water reserve affected the composition δ18O ja δ2H isotopes in the water of OL-PVP12 and OL-PVP30.Changes that in most cases are related to the hydraulic gradient caused by open underground spaces were observed in deep groundwaters. Downward movement of sulfate rich groundwater along either hydrological zones (BFZ045, HZ056) or open drillhole (OL-KR45, open from 2007–2015) was seen in elevated sulfide concentrations. Dilution of the water in HZ20 structure was still detected. In an intersecting sampling section of OL-KR4 an increase in sulfate was seen, respectively. Elevated sulphate concentrations were observed also in the underground monitoring points at the final disposal depth. Dilution of ONK-PVA2 continued and changes in ONK-KR4 and ONK-PVA1 were stabilised. Gas samples collected with PAVE and PFL devices corresponded to previus gas sampling results from Olkiluoto. Instead, samples collected with SWA technique indicated lower gas contents.Sampo electromagnetic soundings were not carried out in 2018 because the broken device could not be fixed during the year.

KW - hydrogeochemistry

KW - final disposal facility

KW - ONKALO

KW - monitoring

KW - groundwater

KW - gas sampling

KW - analysis results

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M3 - Report

T3 - Posiva Working Report

BT - Results of Monitoring at Olkiluoto in 2018, Hydrogeochemistry

PB - Posiva

ER -

Penttinen T, Wichmann A, Ripatti K, Nummela J, Yli-Rantala E, Wendling L et al. Results of Monitoring at Olkiluoto in 2018, Hydrogeochemistry. Posiva, 2019. 171 p. (Posiva Working Report; No. 2019-44).