Effects of Nonaqueous Phase Liquids Pollution on the Permeability and Microstructure of In-Filed and Laboratory Soaked Contaminated Clay Soils

Table 4

Summary of changes in apparent characteristics of indoor soaked contaminated samples by TCE (t = 212 days).

Soil layer	N	L (%)	D (cm)	S	The apparent color change of soil samples
Layer (2)	1	3.87	0.232	0.92	Blackened significantly
Layer (3)	—	2.20	0.132	0.96	Blackened significantly
Layer (4)	—	2.58	0.155	0.95	Turn black
Layer (5)	—	5.85	0.351	0.89	Blackened significantly