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Re: [Shop-talk] plumping question and sandrock sewers

To: pethier@comcast.net, David Scheidt <dmscheidt@gmail.com>
Subject: Re: [Shop-talk] plumping question and sandrock sewers
From: Doug Braun <doug@dougbraun.com>
Date: Mon, 29 Oct 2007 12:37:41 -0700 (PDT)
Thanks for the interesting information about the
geology of St. Paul!  I've heard  there are a lot of
interesting old tunnels in St. Paul.

Doug

--- pethier@comcast.net wrote:

> 
> I have mentioned that Saint Paul is a river-bluff
> town.  Our city datum for 
> elevations is USGS sea level minus 694.10 feet. 
> This is based on some 
> point at some steamboat landing circa 1850.  I'm in
> an office downtown in a 
> building on top of a bluff.  The city datum at the
> front door is about 95 
> feet.  A nearby storm sewer is essentially down to
> river level, so the 
> dropshafts here are about 90 feet deep.  The
> 150-foot-deep tunnels are out 
> in the Midway district, carrying storm water to
> outfalls in the Mississippi 
> on the west edge of town.
> 
> There are also some deep sanitary-interceptor
> tunnels.  The metro-wide 
> treatment plant is located in Saint Paul, so
> sanitary flows are conveyed by 
> a combination of tunnels and conventional pipes from
> other cities such as 
> Minneapolis through Saint Paul to the plant.
> ============
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