DWV cleanout question
 

The plumbing company that did my trenchless sewer lateral replacement is
just finishing up the job. I haven't paid them yet. There's a few issues
I'm concerned about. One is what appears to me an inexplicable failure
to concrete over one ~2 square foot area next to a cleanout. That
cleanout is covered by what a worker called a Christy box, which is a
concrete and plastic conical cylinder with a circular concrete plastic
covered top. They have put new concrete around one side, but not the
other. I called and didn't get an answer on that one.

The other concern I have is a different cleanout. It's at grade level
where an approximately 4 inch internal diameter black water drain pipe
comes down the outside of the two story house. They have what I think
you'd call a no hub connector that attaches the 4" drain pipe to their
cleanout. I have two issues with this (and I'm no expert). The first is
that the connector, which is around 4 inches long, is exposed black
rubber with hose clamps on the ends and is above grade. Therefore it
will get sunlight during a significant portion of the day. A book I have
suggests that such rubber connectors are for below grade. Shouldn't they
use a connector with stainless steel on the outside for the full length
of the connector for this above ground application?

The other concern here is that the top of the cleanout there is below
grade by 2". They have a rubber cap on the cleanout that you just pull
off. Now, I was regrading the ground around the concrete they poured and
the holes they'd dug to do the trenchless and I don't know what to do at
this cleanout. If I add dirt to grade, the top of the cleanout (with the
black rubber cap) will be almost 2" below grade and invisible. If I
don't add that much dirt, the cleanout will be in a depression and be
exposed to the elements, including sunlight. Shouldn't they do something
different with that? I'd asked the foreman of the crew and he answered
that they always do it like that, and I just said "OK." I wonder if I
should mention this to the supervisor, who I'm going to call about the
concrete work that wasn't done. Thanks for any information!

Dan