On Mon, 27 Dec 2010 12:11:20 -0800 (PST), "hr(bob) "
wrote:
Virtually every sewer connection I have seen in houses/buildings under
construction over the past 60+ years run straight out to the sewer
line in the street, or up the back property line

Just another data point: mine runs out the back of my house at a 45
degree angle, takes a 45 to run parallel to the back for about 20'
until it's clear of the end of the house, does a 90 and goes straight
to the street. Reason: house originally had a septic tank out back. In
fact it still has a septic tank, but it's not connected to anything.

Edward