In article . com, Jules
wrote:

Jules wrote:
We've got a large cess pit under one lawn

[spippety snip]
re. covering them individually, problem is that there's two lines of
four with maybe 3' of spacing between them, and then another group of
three (not in a line) at the other side of the lawn, something like:

o o o o o o o o

I may be wrong but family-in-law had cess pits which were basically storage
systems of brick or concrete pits that filled up and needed emptying every
12 / 18 months or so.

Septic tank is an enclosed tank (concrete or plastic in France) designed to
break down the waste and might need emptying every decade or three

My new septic tank has two removable concrete lids, 60cm diameter by about
4-5cm thick for inspection / emptying.

The outflow leads to a sand filter. (new specs locally) The sand filter has
a network of pipes with inspection chambers similar to those covers you
describe. I've only 3 I think plus some vent pipes. If you have a larger
septic tank, it may need larger area filter. (Or shallower filter / larger
area)

--
John Mulrooney
NOTE Email address IS correct but might not be checked for a while.

The world is full of willing people; some willing to work, the rest willing to let them.