Drain leak cleanup in crawlspace

[Larry Asiak]

Hope this is the right forum.  I’m not necessarily looking to do it myself, but I also don’t just want to pay a company $6k and assume they know what they are doing.   

 I have a drain leak under the house.   It’s the main drain line, original cast iron, and totally corroded and leaking in multiple spots.   Unfortunately I suspect it has been going on for years, but I just bought the place and the inspector missed it.  

The house has a raised foundation and the crawlspace is pretty clean, but the ground is soft In a circle with at least a 12 foot diameter.   I am having the drain replaced, but concerned on proper cleanup and drying.    The house is in LA county, so we are getting warmer weather, but it’s also pretty humid still.   The house seems to have wicked the moisture, so I think a dry out is necessary - fans and dehumidifiers.    I have read suggestions to fog with some sort of antimicrobial.   Some say chlorine solution but I’ve read that urine can create gas with amonia.    Another solution I have read is to install a vapor barrier.   I can see how blocking toxins could be  good for air quality in the house.   It’s original wood floors so I think a good amount of air does come up into the house.   It seems though that a vapor barrier would have issues with maintenance down the road and whatever is deeper in the ground after a dry out would never resolve.  

I bought the house to try and house hack it, but living on top of this has proved quite stressful.   I’m almost one month into it and can’t imagine getting a roomate anytime soon.     Certainly their is a lot to discuss about the purchase and perhaps inspector, however my main concern  right now is fixing the problem.   Does anyone have any advice on the best approach to cleaning up this mess?   Or a place to find more info?  I feel it’s a serious health concern.