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Miningman, I didn't realize that only mining people understood that only miners can send a possibility of a fix.

I thought you said the tunnel was about 11 ft. tall and 9 ft. wide.

You may be able to slip line the tunnel with a pipe that is not attacked by the chlorine. Then pressure grout the annular space between the pipe and old tunnel.

What are they using the tunnel for? Can you expose one end of the tunnel?

The HDPE manhole rings we used were made in Stacy, MN. Do a search on them. There may be a local company in your neck of the woods.

Contact the Kansas board that regulates PE licenses. They will spell out exactly what you need.

There are a few "rubberized" inserts to seal the adjusting rings, both inside MH and outside. That said find out what the Waste water people use on the MH's.

If the main pressure is 170 psi, the fixtures in building hooked up to it would be blowing fixtures all over. The main is probably 10 feet deep so the pressure at the hydrant may be 5 psi less due to the lift to the hydrant.

Look for a couple hog or beef farms near your area. check with them to see if they would take the seaweed. then they can supply the trailer? to haul it back to there feedlot. Should be cheaper to drag the weeds to a spot that they can get to. You may have to help with the loading.

Standard test for pressure lines is 2 times the working pressure plus 50 psi. Leakage is less than 20 gal per internal inch diameter per day

Could you post a drawing of the Grit tank?

What is in the pipe? max pressure?

shotcrete is a sprayed on concrete. Cement sand and pea rock. Call a couple contractors that do that work.

Have you looked at "microtunneling"? What is the project? Pipelines?

Attach a curved steel angle all around the HDPE. Shotcrete the angle to the block. Maybe add a few #4 rebar before the shotcrete.

Just build a wall of concrete blocks and fill SLOWLY. Monitor the bulkhead as the pipe fills. what kind of grout are you using?

Call your local building inspector for a visit.

Drive around the city and look for street projects. Look at the manholes to see if City forces/ contractors use lots of grade rings instead of MH sections. You may be surprised at what you find.

Is the manhole part of the property owner's connection? Does the property owner own the MH or the city? What is the purpose of the manhole? Can the connection be extended to the outgoing pipe and fill in the MH?

Seal coating AC pavement will keep the AC cooler. Spray on the AC binder mix and cover with granite chips. Then roll it very well. It will be gray instead of black. Keep traffic off for a day or 2. This also improves traction.