Chemical Evolution Process and Quality Assessment of Seepage Groundwater in Tunnel Crossing Gas-Bearing Coal Seams

Table 1

Sample points corresponding to pile numbers.

Group	Sample	Corresponding pile number	Group	Sample	Corresponding pile number
I	1	YK43+645	III	13	YK43+000
	2	YK43+715		14	YK43+150
	3	ZK43+800		15	YK43+350
	4	YK36+071.4		16	YK43+080
	5	YK43+140		17	YK43+200
	6	ZK43+287		18	YK43+610
	7	YK43+648		19	No. 4 inclined shaft
	8	YK43+650		20	No. 4 inclined shaft
II	9	YK43+936	IV	21	No. 4 inclined shaft
	10	YK43+820		22	No. 4 inclined shaft
	11	YK43+820		23	No. 4 inclined shaft
	12	YK43+930		24	No. 4 inclined shaft