Running MDPE pipe through drainage field

[flanagaj]

I am having a real dilemma regarding getting our site configured for a static caravan.  There is a 1000 gallon septic tank already on site, but unfortunately, when I pulled the trench for the new water main I pulled through the drainage field pipe.  The pipe was not perforated soil pipe like you use nowadays, but the flexible drainage pipe with slots all over it.  

The reason it's causing a headache, is for the following reason

a) it would be much easier if we could simply connect the caravan to the existing septic tank.  This would save me having to install the new plant and drainage field now and run 34m pipe from the caravan to the new tank.  It would also enable us to get living on site quickly and without having to renew our rental tenancy.
b) The main concern is that the new water main pipe is running under the existing drainage field and I am now thinking whether I should have installed barrier pipe instead of MDPE.  Or whether I don't need to worry as you won't get contamination through the pipe unless it's oil based products that are in the soil.

 

 

[FarmerN]

I would not like to comment on the drinking water quality of the pipe pulled through a drainage field.

Personally I'm a bit agricultural about these things, but thats me. There must be an element of risk...........but .

Is the MDPE contiuous with no joints while going through  the drainage field?

Are there small childeren or vunerable people living there? 

 

As for the drainage field , it sounds like standard flexible land drain pipe. Joints are readily avaliable  on line ( Plastic Express etc  https://www.plastics-express.co.uk/land-drainage-80mm-products.html ) and with these it would be easy to repair any severed pipes . 2 joints and a short length of pipe of the right size  and a bit of gravel to repair any breaks.

Edited yesterday at 10:08 by FarmerN

[BadgerBodger]

IMHO you should definately have used barrier pipe. 

[nod]

If your pipe is continuous without any joints There’s no chance that the drainage field contents will ever soak through the water pipe Less likely than the lead pipe that supplied our drinking water for 100 plus years 

[Nickfromwales]

Should be barrier pipe, but only certain contaminants will really penetrate that pipe, and only over time; petrochemical spills etc.

 

Dig around the damaged pipe, repair it, connect to tank and move on.

10 hours ago, flanagaj said:

It would also enable us to get living on site quickly and without having to renew our rental tenancy.

Chop chop!

[saveasteading]

14 hours ago, flanagaj said:

the new water main pipe is running under the existing

Can it run over the top?

[flanagaj]

9 hours ago, saveasteading said:

Can it run over the top?

I could run it over the surface for the static, but not for the house. The existing tank has been drained and has now not been used for over 12 months, so if I do just simply decommission it, then I am sure that by now, the soil should have reached a level which should not pose a health risk.  Is does also indicate that the risk, as @Nickfromwales stated is from petrochemicals.

 

[Nickfromwales]

1 hour ago, flanagaj said:

I could run it over the surface for the static, but not for the house. The existing tank has been drained and has now not been used for over 12 months, so if I do just simply decommission it, then I am sure that by now, the soil should have reached a level which should not pose a health risk.  Is does also indicate that the risk, as @Nickfromwales stated is from petrochemicals.

 

We’re not even supposed to use Denzo tape on potable copper feeds anymore.