pH
Location	2017	2018
1a	8	7.5
1b	8	7
1c	8	6.5
1d	7.5	6
2a	6.5	7
2b	6.5	7
2c	7	7
2d	7	6.5
3a	8	7.5
3b	7.5	7
3c	7.5	7
3d	7	7
4a	7.5	7
4b	8	7
4c	7.5	7.5
4d	7.5	7