I have some poor audio recording from a video shoot that i need to recover.

Attached is a small sample of some audio that has been recorded during a video shoot for a client. The audio was recorded using a bayer dynamic - shotgun microphone, and captured onto a Tascam DR-40 audio recorder. The master files are WAV.

The 3 (mp3 samples for eases of attachment) attached are of 2 x separate pieces to camera (on different ocasions) and the other is a sample of some live action recording in a store environment.

I have attempted to recover a sample using EQ in Adobe Audition, but this is not my key area of expertise, and need to work on the rest of the editing, and I believe that someone with advanced audio engineering skills could do a more professional job get these to an acceptable standard.
The entire 'un-edited' audio files requiring attention have a running time of 2.5 hours.
My best estimate is that the amount of audio we would actually use would be less than 20 minutes.

KEY QUESTIONS:
1: Can you recover this audio to a good standard?
2: Is there any cost benefit if I edit the 'rubbish out first' and send you just the content to be used? (I would prefer to just send you the entire file collection - (820mb)
3:How long would you need to do it?
4: How much would you charge?

Let me know as soon as possible.

Kind regards

Jim