completed and unit has been properly connected to influent and effluent
piping, allow influent oil-in-water mixture previously described in
paragraph entitled "SYSTEM DESCRIPTION" to flow into separator filled with
water. Adjust and level [primary] [and secondary] surface oil overflow
weirs to optimize oil skimming and minimize water overflow to oil recovery.
Optimize operation of unit within 5 working days. Operate unit for a
minimum of ten separator volume changes prior to testing for removal of
contaminants and document testing results.
3.3.3.1
Analytical Methods
Test and sample preservation methods for test contaminants shall be in
accordance with the latest revisions of APHA SMEWW, APHA Standard Methods
for the Examination of Water and Wastewater, EPA 600/4-79/020, EPA Methods
for Chemical Analysis of Water and Wastes, or those substitute methods
approved by the governing regulatory agencies having jurisdiction.
3.3.3.2
Test for Contaminants
Verify the separator efficiency by testing influent and effluent for
contaminants described in paragraph entitled "Performance Requirements." If
effluent quality is found to be unacceptable, then verify influent to
effluent performance in particle size removal at the site. Tests shall be
performed by an independent certified testing laboratory.
3.3.3.3
Sampling Procedures
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NOTE: The separator top hatch covers are used by
many manufacturers to satisfy the sampling port
requirement. The designer has the option to provide
dedicated sampling points integral to the influent
pipe and effluent pipe.
**************************************************************************
Within an 8 hour period and at regular intervals collect a minimum of 10
influent and effluent samples from sampling ports provided as part of the
separator. Purge each sampling port to remove built-up solids or other
material prior to collecting sample. Collect wastewater samples
isokinetically in clean glass containers with polytetrafluoroethylene lined
caps. Collect duplicate wastewater samples in separate glass containers.
Do not attempt to split sample. Use containers for other contaminants as
recommended in references listed in paragraph entitled "Analytical Methods."
3.3.3.4
Acceptance Criteria
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NOTE: Based on standards or guidelines established
by environmental regulatory agency(ies) in which the
project is located or based upon wastewater
treatment process(es) that follow downstream from
this separator, specify the maximum unacceptable
limit permitted in order for the separator to be
accepted as meeting the performance requirements of
this specification.
**************************************************************************
90 percent of the effluent samples taken shall not exceed the specified
daily maximum limit for [grease and oil] [petroleum hydrocarbon]
SECTION 11311
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