MDEQ Criteria for Success in CSO Treatment
CSO controls in the Rouge River Watershed are being implemented
in three phases through NPDES permits:
- Phase I elimination of raw sewage and the protection of public
health for approximately 40 percent of the combined sewer area
- Phase II public health protection for the remaining combined
- Phase III meet water quality standards in the Rouge River
Under Phase I, six communities have separated their sewers. The
measure of success of the sewer separation projects was whether
the projects met the Michigan Department of Environmental Quality
(MDEQ) criteria for construction of new sanitary sewers. Because
of unique situations in some cities, MDEQ had those cities address
that situation as part of the evaluation criteria.
Eight communities have constructed 10 retention treatment basins
under Phase I . Each of these basins is sized for different design
storms and several employ innovative technology. The facilities
were intended to meet demonstrative criteria, rather than presumptive
criteria. Facilities also incorporate a variety of additional features
or variations in compartment sizing and sequencing in an effort
to improve their effectiveness. Details on the individual CSO treatment
facilities can be found at CSO Demonstration
The following NPDES permit condition established the CSO basin
Conduct a Retention Basin Evaluation of the effectiveness
in meeting Phase II goals of the elimination of raw sewage discharges
and the protection of public health, and in meeting the Phase III
goals of the elimination or adequate treatment of combined sewage
discharges to comply with water quality standard at times of discharge.
The evaluation shall be coordinated with other Retention Basin Evaluations
being undertaken by other permittees in the Rouge River Basin...
The MDEQ worked closely with Wayne County, consultants to the CSO
Basin Communities, the Rouge Project, the Detroit Water and Sewerage
Department and US EPA-Region 5 to develop criteria to aid in the
evaluation of the Rouge River CSO demonstration basins. Those Criteria
for Success in CSO Treatment were issued by MDEQ on August 11, 1998.
The Criteria can be found by clicking on the following: Criteria
for Success in CSO Treatment.
It is very important to note that MDEQ has concluded that all six
of the CSO retention treatment facilities that have completed data
collection are currently meeting the Phase II criteria of the elimination
of raw sewage and the protection of public health. A
June 9, 2000 Letter of Approval for Phase II Review focused
on the following retention treatment basins: Acacia Park CSO Retention
Treatment Basin, Birmingham CSO Retention Treatment Basin, and Bloomfield
Village CSO Retention Treatment Basin. The
August 7, 2000 Letter of Approval for Phase II Review focused
on the following retention treatment basins: Inkster CSO Retention
Treatment Basin, Dearborn Heights CSO Retention Treatment Basin,
Redford Township CSO Retention Treatment Basin.
For additional and more detailed information on the performance
of the CSO treatment facilities, go to technical
papers and professional presentations.