If the pipes are galvanized and subsequently rusted or deteriorated then you can either tunnel under the house (stupid and unsafe if not done correctly) or hammer the slab and replace it with plastic. 

The family was in the house in full body plastic suits and respirators. 

I would dig this little bit out,,,then find a bigger size curved plastic pipe to use as a sleeve,,,hook a water hose to it and wash it under and thru,,,then thread the pex right thru that. 

I think he was saying that the cheaper ducts that go in the walls have a layer of insulation and plastic around them thats why they don't condensate.  

TOOLS REQUIRED-Post hole digger, long handled pointed shovel, baulk-line, measurement tape, power tool with plastic cutting blade, extension cords, concrete combination tub, 4' level.

So, be aware of that - once you put those signs out:1) People will take them - often other investors or neighbors that don't want plastic signs in their area, and2) Code enforcement could fine you.  

My occupation is as a scientist in the plastics industry with 21 patents issued under my name; however, my business is real estate investing.

Per the mitigation firm, the mold is contained to the crawlspace, with no indication it is in the living space.Environmental Services said that he feels that the home is safe to stay in since the mold is 1) in the crawlspace, 2) there is a plastic tent over the access trapdoor, 3) the furnace is not located in the crawlspace, 4) the mitigation company has established negative air pressure in the crawlspace 5) as well as using anti microbial treatments and 6) water remediation efforts.I consulted with a real estate attorney.  

I never got so excited reading about plastic before!

He was in serious condition and has had surgery, but is not life threatening now.