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The tank is original before I made the lid there a weir which partially supports the lid as well. Yes we have installations that are deeper for certain reasons and we installed risers as needed. Typically system design in the areas where I worked had the tank as shallow as possible because the...

We call it H20 load rating. Pretty low cost for the tank. Usually it was $100. Those lids are much pricier. Close to $900. I just used the rated tank in case someone wanted to do the lids later.

To each his own. When I was in the business of installing septic tanks and restaurant grease traps (same thing without leach fields) dozens were installed in driveways and parking lots. It’s just a matter of design.

You must know all conditions to rate loads. Consider the fact that this tank is 20’ from a single car garage and centered with the doorway. The car’s wheels are nearly aligned with edges. The capacity is only varying by the misalignment of the car without running into the garage itself. The...

Tank covers must be accessible at ground level due to local code. The lid is 6” thick with #6 rebar on 12” centers and # 4 rebar on 6” centers. The tank was existing about 20’ from the garage. They have been driving over it for 20 years. I am a general engineering contractor since 1980. I...

The concrete rings are ram neck sealed and the lids are “O”ring with bolts. They are gas tight lids.

Picture of a tank lid I made on the job.

I used to install septic systems and I had one supplier I used that made a high load tank that I put in locations that needed it. I have also replaced tops of existing tanks with a top I made on sight using street manhole risers and cast iron lids (bolt down and gas tight). I also installed...