New septic system

[Mike058]

Mike058 - Photobucket - Video and Image Hosting Not too exciting, but I know how everybody likes pictures I found the whole process pretty interesting, but that's just me. It's in the ground, approved and just need to back fill it.

 

[plowking]

Looks like an infiltrator system. It is a slope system with conventional d-box.[ If box isn't level or rows aren't equal,there are speed levelors or flow equalizers that can be installed in pipes to adjust the flow]In NH ,theses systems are rare and usualy are serial distribution with no d-box,the flow has to fill each row fully,the overflow runs downhill from back of row to next row, end of rows alternate the pipes back to front. I dont care for serial distribution as each row doesn't handle the volume equally. The pipe from tank to d-box should be schedule 35 or schedule 40 for durability and less chance of damage from backfillling. I have had to do a few pipe repairs on houses built around 2004-2005. The pipe was schedule twenty and had been damaged by backfilling. Your soil looks like it has roots from being located in the forest,hopefully this won't be a problem in years to come. I hope you have good luck with it. plowking

 

[Mike058]

Each outlet in the D-Box has a rotating plug with an off center hole. By rotating the plug while the box has water in it, each hole can be "dialed in" and each pipe receive an equal amount of effluent. I watched them adjust it. I'll have to see if the pipe is schedule 40 or not. I imagine it is. After the builder got done, the designer had to sign off on it and then the inspector from the county. The designer noticed the trees but said the douglas fir and cedars weren't a problem. He mentioned a couple of species, but the one I remember him mentioning was maple. They're bad about growing into sewer systems.

 

[tommu56]

Mike058

The pipe they used looks like sdr35 gasketed.
to put it together you grease (special) bell slide pipe in bell and push I usually use a board and digging bar or the hoe if its close by
tom

 

[Bird]

That's interesting. I've seen a lot of septic systems, but never anything even remotely resembling that. I don't know if the difference is the different part of the country, or just something newer than what I've seen.

 

[Mike058]

That's interesting. I've seen a lot of septic systems, but never anything even remotely resembling that. I don't know if the difference is the different part of the country, or just something newer than what I've seen.

They told me using chamber trench is the way to go these days. I read up on it and even though it's more expensive than perforated pipe and gravel, it has some big advantages. Those black pipes you see the top of are pretty much just a cover for the trench. Half pipe sections that lock together. They're ribbed and have that natural arch shape, so I expect they can hold up quite a bit of weight. The effluent just flows into the trench. And the trenches can hold quite a bit. I'm kind of lucky. They don't ok many gravity systems around here. The soils got to be right and you have to have enough area for the leach field below the drain field.

 

[Eagleview]

We must be lucky over here . A 20 metre trench , a hundred car tyres standing up in a row , some permiable cloth on top , some old corrogated iron to stop the tyres filling with dirt and then back fill , jobs done .

 

[plowking]

I went to check the pictures again, told me it was blocked. Does your rows of chambers [ infiltrators]have vents? For strength they need to have a certain amount of material. I have seen these systems crushed from too large a machine backfilling to close before the soil was on top . I like the fact there is no filter fabric or membrane,those can clog faster from suffocation, water softeners can damage it if their backflush goes into septic. Some states allow seperate drywells for softener,some require it to go into septic. Are you going to have an effluent filter in outlet of tank? plowking

 

[Mike058]

I went to check the pictures again, told me it was blocked. Does your rows of chambers [ infiltrators]have vents? For strength they need to have a certain amount of material. I have seen these systems crushed from too large a machine backfilling to close before the soil was on top . I like the fact there is no filter fabric or membrane,those can clog faster from suffocation, water softeners can damage it if their backflush goes into septic. Some states allow seperate drywells for softener,some require it to go into septic. Are you going to have an effluent filter in outlet of tank? plowking

The guys that built are going to backfill it. They crush anything, they'll replace it. They're pros, I watched them work and feel confident they'll do it right. Plus I'm having them do it on my day off so I can watch. The chambers are already halfway covered in dirt anyway. There isn't any filter in the outlet. In this photo Image of Trench field - Photobucket - Video and Image Hosting you can see inspection ports in the middle of each trench. I don't know if they'll serve as vents or not. There isn't any other kind of vent used though. I'll have to ask them about that. Or do you mean cut into the sides of the chambers? If so the answer is yes. We're fortunate to not have hard water and no need for water softeners, so no worries there.

 

[plowking]

Because your chambers have a plastic covering,being the chamber itself,the field need air or oxygen to grow the right type of bacteria. If it can't get it thru the soil cover,it has to draw air from the surface above the water level of the tank,the air in tank is supplied by the vent pipe on roof of house,if supply is limited then field can go anaerobic and plug up. The infiltrators I deal with are vented. You can always go to their website,they should have online installation manuals for different states. plowking