NC0084387_Staff Comments_19960423

Staff Review and Evaluation
NPDES Wastewater Permit
FACILITY INFORMATION
Facility CMUD / N. Mecklenburg WTP
NPDES No. NC0084387
Design Flow (MGD) .575
Facility Class II
STREAM CHARACTERISTICS
Stream Name
McDowell Creek
Stream Class
WS-IV
Sub -basin
03-08-33
Drainage Area (mil)
28.3
S7Q10 (cfs)
1.8
W7Q10 (cfs)
4.2
30Q2 (cfs)
4.8
IWC (%)
33%
Proposed Changes
Parameters Affected
Basis for change(s)
None
Compliance Schedule: N/A
Special Condition(s): N/A
Permits & Engineering Comments:
Facility is still not constructed; startup about July or August 1996.
Last Staff Report: Mike Parker, 9/1/94. This SR stated that TSB should give consideration to
including toxicity. Mike Parker stated that this has been resolved per Dave Goodrich and
Coleen Sullins.
Recommend renewal of NPDES permit with no changes.
Prepared by:
Regional Office Evaluation and Recommendations:
;12 off

SOC PRIORITY PROJECT: No
I
To: Permits and Engineering Unit
Water Quality Section
Attention: Jeanette Briggs Powell
Date: October 17, 1994
AUTHORIZATION TO CONSTRUCT "
NPDES PERMIT
REPORT AND RECOMMENDATIONS
County: Mecklenburg
MRO No.: 94-212
Permit No. NCO084387
03-0��33
PART I - GENERAL INFORMATION
1. Facility and Address: CMUD-North Mecklenbu lU`GLowELc��
5100 Brookshire Boul
Charlotte, N.C. 2821
2. Date of On -Site Investigation: August 29, z75a-
3. Report Prepared By: Michael L. Parker, Environ. Engr. II
4, Persons Contacted and Telephone Number: Brent Reuss, Black
& Veatch, [phone].
5. Verified Discharge Point(s), List for All Discharge Points:
Latitude: 35' 25' 42" Longitude: 81° 53' 17"
Attach a USGS map extract and indicate treatment facility
site and discharge point on map. Ensure discharge point(s)
correspond to NPDES permitted discharge points.
USGS Quad No.: F 15 NW
6. Site size and expansion area consistent with application?
Yes.
7. Topography (relationship to flood plain included): The WTP
will not be constructed in the flood plain.
8. Location of Nearest Dwelling: None within 200 feet of the
site.
PART II - DESCRIPTION OF DISCHARGE AND TREATMENT WORKS
1. Existing Treatment Facility
a. Current permitted capacity: N/A.
b. Date(s) and construction activities allowed by previous
ATCs issued in the previous two (2) years: N/A.

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Page Two
C. Actual treatment capacity of the current facility
(design volume): N/A.
d. Description of existing or substantially constructed
WWT facilities: N/A.
2. Type of Proposed Treatment Facility: The applicant proposes
to construct filter backwash WWT facilities consisting of a
surge/equalization basin followed by polymer and bisulfite
addition, a clarifier, dual gravity thickeners and a sludge
storage basin.
3. Residuals Handling and Utilization/Disposal Scheme:
a. If land applied, please specify DEM Permit No.
WQ000057.
Residuals Contractor: Wheelabrator Systems
Telephone No. 704-542-0937.
4. Treatment Plant Classification (attached completed rating
sheet): Class I
5. SIC Code(s): 4941
Wastewater Code(s): 21
Main Treatment Unit Code: 51003
6. Important SOC/JOC or Compliance Schedule Dates: N/A
PART III - EVALUATION AND RECOMMENDATIONS
The applicant has requested an ATC to construct filter
backwash WWT facilities to serve a proposed municipal WTP.
Although the facility will discharge into nearby McDowell Creek,
a CMUD sewer line exists at the WTP site, if needed. It should
also be noted that elevated levels of nutrients have been found
through stream sampling conducted by the Mecklenburg County
Department of Environmental Protection (MCDEP) in McDowell Creek
near the junction with Mountain Island Lake, z 2-3 miles below
the proposed WTP site.
Pending a technical review and approval by P&E, it is
recommended that an ATC be issued.
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L��r4e��H� t: � � �)' 0 C-' e 4: - �e —
Signature of Report Preparer
Date
WA
Water Quality Regional Supervisor