oil-in-water mixture. The practical minimum
concentration achievable is 10 mg/L for a parallel
plate separator under ideal conditions.
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NOTE: In general, free oil is defined as dispersed
oil globules that rise to the surface of the water
in which it is contained. The rate of rise of the
oil particle is a function of its size and specific
gravity as defined by Stoke's Law. Oil droplets
with diameters of greater than 20 microns and
specific gravities of 0.95 or less are considered to
constitute the free oil form. Smaller oil droplet
diameters are attributed to mechanically or
chemically emulsified oil.
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The [grease and oil] [petroleum hydrocarbon] concentration in the effluent
from the oil-water separator shall not exceed the following limitations:
Maximum
[Total grease and oil, 30-day average
[_____] mg/L]
[Total grease and oil, daily maximum
[_____] mg/L]
[Petroleum hydrocarbon, 30-day average
[_____] mg/L]
[Petroleum hydrocarbon, daily maximum
[_____] mg/L]
[_____]
[_____]
To achieve [this goal] [these goals], it will be necessary to remove all
free oil droplets equal to or greater than [20][_____] microns.
1.3
SUBMITTALS
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NOTE: Submittals must be limited to those necessary
for adequate quality control. The importance of an
item in the project should be one of the primary
factors in determining if a submittal for the item
should be required.
A "G" following a submittal item indicates that the
submittal requires Government approval. Some
submittals are already marked with a "G". Only
delete an existing "G" if the submittal item is not
complex and can be reviewed through the Contractor's
Quality Control system. Only add a "G" if the
submittal is sufficiently important or complex in
context of the project.
For submittals requiring Government approval on Army
projects, a code of up to three characters within
the submittal tags may be used following the "G"
designation to indicate the approving authority.
Codes for Army projects using the Resident
SECTION 11311
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