JRscooby wrote:
Note sure why sewer line needs to be below frost line.
If liquid is standing in line long enough to freeze likely to build up to a clog no matter what weather.
Yahk bahk, this is an example of misleading information.
However if NOT building to code and only a seasonal site, freezing concerns are much lower. Possibly not a real world concern at all. Maybe not even a regulatory concern however that is highly doubtful as even places that have virtually no residential building inspections and loose easy to acquire permitting still generally regulate sanitary sewer closely compared to other utilities due to the sensitive nature of installation and effluent.
However no one including the above response knows enough about your situation to surmise that trench depth would not be a concern for regulatory or practical reasons.
Fwiw if you have specific questions and need specific feedback I can try to help. Just pm me.
I’ve installed underground sewer from 3” to 108” diameter. What you’re doing is quite likely something I’d rent a little trencher or mini-exc and do in a weekend during the off season when none of the nosy neighbors are present! Lol.