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RE: Water Pollution Reduced Metrics



I'd suggest using an average density for solvents (eg The CTGs prepared by
OAQPS used to use 7.36 lbs/gal as an average for solvents used in coating).
Depending on the process, concentrations can usually also be estimated.  If
you have a specific family of solvents in use you can use those densities
(eg petroleum spirits are about 6.6 lbs/gal, CRC Handbook has densities for
most other organics in commercial use) which would likely be a closer
number. 

Alternatively, if it is not part of the product (many solvents are used as
carriers) go upstream and do a mass balance based on purchase and production
records. What comes in has to go out in some form. Unless it is central to
the product it usually is in some waste stream.  

-----Original Message-----
From: owner-p2tech@great-lakes.net
[mailto:owner-p2tech@great-lakes.net]On Behalf Of
Ohare.Tara@epamail.epa.gov
Sent: Wednesday, May 18, 2005 4:47 PM
To: P2tech@great-lakes.net
Subject: Water Pollution Reduced Metrics


I have a question about how to define metrics for water pollution
reduced.  We have been currently measuring water pollution reduced in
pounds, but we have a situation where a company has reduced the
discharge of a solvent which is measured in gallons.   We are struggling
to determine how to capture this and still be consistent with our
current metrics definitions.  We considered converting the gallons of
the solvent into pounds, but the type of solvent and concentration will
probably be different with each application making conversions
difficult.

What is the best way to capture the amount of reduction of these
solvents in water?

Tara O'Hare
U.S. EPA
1200 Pennsylvania Ave. NW
Room 5303MM, MC 7409-M
Washington, DC 20460
202-564-8836

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