TABLE 1.

Summary of samples, drill bit types, fluorescent-microsphere application methods, and fluorescent-microsphere penetration

Sample site	Depth (m)	Sample type	Application methoda	Drill bitb	Depth of penetration (mm)c
Eu1d	11.58	Permafrost	C	TC	5
	11.58	Permafrost	C	TC	2
	11.58	Permafrost	C	TC	2
Eu2	2.06	Ground ice	C	TC	5
Eu3	6.48	Ground ice	C	SA	6
	6.61	Ground ice	C	SA	2
	7.15	Ground ice	B	SA	4

^aMethod of fluorescent-microsphere application: B, fluorescent-microsphere plug; C, fluorescent-microsphere painting.

^bDrill bits used: TC, tungsten carbide; SA, Sipre auger.

^cDepth of fluorescent-microsphere penetration as measured from the exterior of the core sample.

^dSite Eu1 at 11.58 m was sampled three separate times for fluorescent-microsphere analysis.