long term flooded crawlspace

[Guest guest]

Asked to do a water intrusion investigation on a 1978 house built

on compacted sand and clay fill in a flood basin on the Oregon

Coast. Footing is aproximately 20 inches below grade with a 30 inch

stemwall. When the footing/stemwall was poored, 1x4 lumber was left

in the footing at the footing to stem wall joint on aprox. 4 foot

centers around the perimeter of a 21 X 28 foot foundation.Nearly

every penatration leaks rain run off into the crawlspace.All

insulation had saturated and fallen into the ponding water and all

but one of the retrofit heating systems ducts had fallen off the

boots and only a short 3 foot run was connected to the plenum.Rats

had used what remaining insulation that was at the girder level and

still dry as toilets.They also had bored into the ducting that hung

in the ponding water to get to the high dry areas to do the

same.When the heater was removed from the the plenum the half of the

plenum that moves air up to the second floor was filled with at

least 250 rat droppings covered with white growth and I would assume

urine. The water rises and falls with rain levels and there are

indications that the level has on a few occasions gone above the

piers and done light damage to posts below girders.Advised owner to

get air quality testing done to no avail.Any issues?Diseases etc.