Hi, I am a new user of Petrasim/tmvoc and i have met some questions doing the exercises withe TMVOC prob7. and i hope someone can help me to resolve it. before that, i have to say that i just did the simulation exactly according to the website http://www.thunderheadeng.com/downloads/petrasim/4/examples/tmvoc_prob7/ problems: 1. in the phase of vocs spill, it can't work out when there were two chemicals spill, and it just fitted for only one chemical 2. when doing with one chemical spill, in the phase of SVE remediation, the simulation just stopped without achieving the simulation time. and i don't know where was wrong. so please give me some advices! thank you very much!