“…The second strategy begins with the statistical hypothesis that the indoor air TCE concentrations for all Monte Carlo realizations C c TCE IA i;j;l with l ={1,2,…,n realizations } for a given monitoring interval (t i −1 ,t i ] and the jth house are log-normally distributed. In contrast, Schwede et al (2008) suggest average concentrations within a large sampling volume follow a beta distribution. However, their analysis is specific to a groundwater plume whereas this work focuses on that of house located above the water table.…”