Table 2.

Summary of input parameters in the ILCR model

Parameters		Input estimates	Distribution type	Data source
Abbreviations: ILCR, Incremental Lifetime Cancer Risk
Breathing rate	m3/h	1.37 ± 0.042	Normal	US EPA, 200935)
Average work hours	h/day	8.87	Point estimate	DBAS, 201632)
Exposure frequency	d/yr	246 ± 1.5	Normal	MOL, 201633)
Exposure duration	year	45	Point estimate	MOL, 201634)
Body weight	kg	69.81 ± 1.39	Normal	MHW, 201652)
Time to cancer	year	77.01 ± 2.01	Normal	MOI, 201653)
Cancer slope factor	(mg/kg/day) –1
- Cr		47.6	Point estimate	Health Canada, 200726)
- Cr (VI)		41	Point estimate	US EPA, 200727)
- Oxidic nickel		4.4	Point estimate	NTP, 19969)
- Soluble nickel		3.0	Point estimate	Health Canada, 200726)
Concentration
- Cr	10–3 mg/m3
Pipeline construction		1361.6 ± 639.8	Log-normal	Field sampling
Pressure container manufacturing		33.8 ± 59.8	Log-normal	Field sampling
Shipyard building		1.1 ± 0.9	Log-normal	Field sampling
- Cr (VI)	10–3 mg/m3
Pipeline construction		503.8 ± 294.7	Log-normal	Field sampling
Pressure container manufacturing		4.4 ± 8.0	Log-normal	Field sampling
Shipyard building		0.4 ± 0.3	Log-normal	Field sampling
- Oxidic Ni	10–3 mg/m3
Pipeline construction		145.2 ± 119.4	Log-normal	Field sampling
Pressure container manufacturing		13.0 ± 11.5	Log-normal	Field sampling
Shipyard building		0.1 ± 0.1	Log-normal	Field sampling
- Soluble Ni	10–3 mg/m3
Pipeline construction		101.8 ± 85.8	Log-normal	Field sampling
Pressure container manufacturing		1.0 ± 0.9	Log-normal	Field sampling
Shipyard building		0.1 ± 0.1	Log-normal	Field sampling