Fastening leach line to septic tank

I had a leak in my rental's leach line, or at least the driveway over the leach line had a constant big foul-smelling puddle all the time the septic tank was in use. It dried up while the rental was empty and while the sewer line was plugged.
I had the tank pumped and dug up around the line and it looks ok. Broke off some of the 'concrete(?)' fastening the line but saw no obvious leaks. Leach line itself looks ok, I can only assume the leak is in the tank/line connection and I didn't see it. I don't know wherec elae it could be. I hate to fill up the tank with enough water so the leach line is in use because I may have to have it pumped to do some work on the leach line later.
I can see no other possible place for the liquid to leak out.
The question is, what is used to attach the leach line? Plain concrete? Plain cement? Special concrete or cement? Something else? I Googled for a long time but couldn't find this info. Wrong search phrases?
TIA
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On Tuesday, June 28, 2016 at 1:50:41 PM UTC-4, KenK wrote:

A leach line is supposed to link, that's the whole purpose, right? I guess it's not supposed to leak a lot until you get to the part where the holes are, so maybe the first X feet should be relatively leak free, but it would seem even if there is a leak there, it's 3ft plus down, so I don't see why you'd have a pool there, but no pool at the leach field itself. Maybe the problem is the leach field is plugged up, the water has no place to go, so it's backing up where it can?
Back years ago they had cesspools with no leach fields. I know cases where a leach field was then added decades later and those didn't use anything to make the whole thing watertight. They knocked out a hole in the side of the cement block wall, put the perf pipe in, threw some cement around it. That was it and it worked, with nothing happening at ground level.
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On Tue, 28 Jun 2016 11:05:53 -0700 (PDT), trader_4

I agree with trader. If you have water coming up, the field is clogged or you have a broken pipe from the tank to the distribution box or the leads going out from there. Have the tank pumped and watch the "out" lead as the water drops. If water is coming back, you have a problem in the field or the distribution. How long it pours back will give you an idea of how far the water is getting before the problem. If it is right there in the distribution, you will not get a lot of water coming back. If the whole field is slugged water may come back for quite a while.
I just did a field here. I know more about this than I want to ;-) I went with a "chamber system" and did it myself, with the help of a hired mini excavator and some day labor.
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On 6/28/16 1:50 PM, KenK wrote:

As Trader_4 said "Maybe the problem is the leach field is plugged up, the water has no place to go, so it's backing up where it can? " Can you partially fill the tank, then use a sump pump to pump water into the tank outlet, and see if it backs up rather than flow freely ?
If necessary use a submersible pump, with a handle that you can attach a rope to, to lower it into the tank.
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Rental property - on septic - there's your first problem ! People flush diapers ... and worse ! .. even otherwise intelligent, decent, people.. ... or their invited guests do so .. ignorant city folk. As another has posted - you might have a clog - - downstream from the leak. Septic Pumper guys might have a way to snake ? Dunno. Good strong modern weepers or old rotten clay-tile ? Good luck . Let us know how you make out. John T.
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