Table 4.

Comparison of field data (R_f = 0.8 for Δp = −5 Pa and R_f = 2.4 for Δp = −20 Pa)

	Δp (Pa)	Measured	3-D simulation	EPA J-E model	Modified J-E model with Rf from Figure 5(b)
cck/csource	−5	0.06 – 0.11a	0.46	0.34	0.34
	−20		0.36	0.11	0.28
α = cindoor/csource	−5	6.2e-4 – 8.2e-4b	2.1e-04	3.3e-4	1.9e-4
	−20		6.4e-04	4.4e-4	6.2e-4

^arange of values based upon actual measured groundwater source and subslab soil vapor concentration values

^brange of values based upon actual measured groundwater source and indoor air concentration values