Forget the fiberglass pipe! Yuck!! :)
SCH 80 PVC is a solvent weld connection. A less expensive way to go would be to use SDR 21 with push-on joints. EBBA also makes "strap-on" restraint for this type joint as well.
You can use MJ fittings on SDR pipe if you use the transition gaskets.
Absolutely horsefeathers!
Same material and same process but with a different way to establish the pressure rating.
PVC has been buried in the ground since it was first manufactured! SDR 35 (very thin walls) was THE replacement for vitrified clay pipe! SCH 40 was first manufactured for...
I can think of a "hybrid" system here that may prove to be workable but end up being much more expensive overall... so... I would vote for a centralized system. Find a manufacturer that provides small tankage that is easily expandable. 140 homes, depending on occupancy, will produce 35,000...
From what you say the answer is simple...
Get started immediately on the design and construction of the replacement outfall!
Any sort of slip-lining system needs access every so often (the greatest distance I have heard of is 1,200 feet between access points). The cost of this sort of repair...
There is a lot of information needed to design a sewer main that incorporates forced (pressurized) and gravity portions within the same pipeline. You have the possibility of restricted flow due to pockets of air trapped in the gravity portion that can become pressurized during some conditions...
