Sony Vegas Pro 10 Splitting Audio

I recorded a narration yesterday with my sony handycam, and I used a a wireless mic and the receiver attached in the shoe of theh camera, but I accidentally put the settings on the receiver to double instead of single, meaning it was picking up audio from the mic and the receiver at the same time and I didn't realize this until I imported these couple tracks onto Sony Vegas 10. What my question is, is there a way to split the audio tracks because all I'm getting is the echo effect and this narration is a half hour long :( I REALLY don't want to ask my talent to come back to read it all again. I'm just hoping there is a way to split the audio track on the audio track on Sony Vegas Pro 10. Thank you!

- T. Munjak