NC0032077_Modification_20181003

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CMSD
POST OFFICE BOX 477
GRIFTON, NORTH CAROLINA 28530
CHARLES M. SMITHWICK,JR.
DISTRICT MANAGER RECEIVED/DENR/DWR
OCT 102018
October 3, 2018 Water Resources
Permitting Section
Division of Water Resources
WQ Permitting Section
ATTN: Mr. John Hennessy
1617 Mail Service Center
Raleigh,NC 27699-1617
Subject: NPDES Permit Modification Request
Sampling Reduction Request
Contentnea Metropolitan Sewer District
Contentnea MSD WWTP
NPDES Permit#NC0032077
Pitt County
Dear Mr. Hennessy:
The Division issued guidance in October 2012 regarding sampling reduction for certain NPDES
facilities. The guidance document, DWQ Guidance Regarding the Reduction of Monitoring
Frequencies in NPDES Permits for Exceptionally Performing Facilities,lists the conditions in
which an NPDES facility may qualify for reduced monitoring. Since the inception of this
guidance, a large number of facilities have'received monitoring reduction through a minor permit
modification request. Part B of the guidance states that"facilities shall submit a written request to
modify their NPDES Permit", CMSD is hereby requesting a permit monitoring reduction based on
the"exceptionally performing facilities"definition. The request is that monitoring for BOD5,TSS,
NH3-N and Fecal Coliform be reduced under the "exceptionally performing facilities" criteria to
two times per week. We are asking for the monitoring reduction now instead of during the NPDES
permit renewal process for the following reasons:
• A Contentnea MSD laboratory staff person has retired and is working part-time until other
arrangements can be made. With a reduction in monitoring, the District would be able to
permanently reduce laboratory staff,thereby making plant operations more sustainable.
• The NPDES permit does not expire until November 2019 and given the extended time to
renew permits, it could be 2 -3 years before the monitoring reduction would be effective if
we don't do a permit modification. Again,the District would lose a chance for cost savings.

The attached data (summarized in the following table) indicates that the WWTP effluent has
greatly exceeded the minimum criteria for reduced monitoring. The most restrictive summer limit
was used for calculating NH3-N removal rates. The data used for this analysis was for the period
of August 2018—September 2015.
Analysis of testing results for the past three years:
- Percent of Monthly Average Limit
Parameter Monthly Limit 3-Year Average % of Limit
BODS 15.0 mg/1 1.5 mg/1 10 %
TSS 30:0 mg/L 0.2 mg/L 0.05 %
Fecal Coliform 200/100 ml 2.36 colonies/100 ml 1%
NH3-N 6.0 mg/1 0.05 mg/1 0.08%
- Number of Samples Over 200% of Monthly Average Limit
Parameter 200% of Monthly Limit Number of Samples Over
BODS 30.0 mg/1 0
TSS 60 mg/L 0
NH3-N 12.0 0
No Fecal Coliform sample exceeded 200% of the weekly average limit
In addition to the exceptional test results, the Contentnea MSD is in compliance with all other
criteria listed in Section B Approval Criteria of the October 22, 2012 guidance document
regarding reduction of monitoring frequencies.
The District appreciates the Division's effort to reduce the regulatory and monetary burden on
systems that strive consistently to provide exceptional wastewater treatment. We thank you for
your consideration in these matters. If you have any additional questions or comments,please call
me at: 252/524-5584
Sincerel
/tri
Charles M. Smithwick, Jr.
District Manager, Contentnea Metropolitan Sewer District

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