NC0027197_Staff Report_20080131

SOC PRIORITY PROJECT: No
To: Permits and Engineering Unit
Water Quality Section
Attention: Dina Sprinkle
Date: January 31, 2008
NPDES STAFF REPORT AND RECOMMENDATIONS
County: Cleveland
NPDES Permit No.: NCO027197
PART I - GENERAL INFORMATION
1. Facility and Address: Shelby Water Treatment Plant
801 W. Grover Street
Shelby, N.C. 28151
2. Date of Investigation: January 30, 2008
3. Report Prepared By: Samar Bou-Ghazale, Env. Eng.II
4. Person Contacted and Telephone Number: Mr. Billy Wilkie, [phone].
5. Directions to Site: The Shelby WTP is located on the left (south) side of SR 1305
(Grover Street) approx. 1.1 miles west of the junction of SR 1305 and Hwyl 8 in Shelby.
6. Discharge Point(s), List for all discharge Points:
Latitude: 350 18' 06"
Longitude: 810 33' 36"
Attach a USGS Map Extract and indicate treatment plant site and discharge point on map.
USGS Quad No.: F 12 SE
7. Site size and expansion area consistent with application: Yes.
8. Topography (relationship to flood plain included): Gently rolling towards the receiving
stream at a rate of 2-5%. The WWT facilities are not located in a flood plain.
9. Location of Nearest Dwelling: No dwelling is located within 500 feet of the site.

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10. Receiving Stream or Affected Surface Waters: U. T. to First Broad River,
a. Classification: C
b. River Basin and Subbasin No.: Broad 030804
C. Describe receiving stream features and pertinent downstream uses: Receiving
stream drains an urban area of Shelby. There are no other dischargers known on
this stream segment. Receiving stream empties into the First Broad River approx.
0.2 miles below the discharge point.
PART II - DESCRIPTION OF DISCHARGE AND TREATMENT WORKS
1. a. Volume of Wastewater: 0.72 MGD (design capacity based on ATC issued 12-18-
85).
b. What is the current permitted capacity: There is no flow rate established in the
NPDES Permit.
C. Actual treatment capacity of current facility (current design capacity): 0.72 MGD
d. Date(s) and construction activities allowed by previous ATCs issued in the
previous two years: N/A
e. Description of existing or substantially constructed WWT facilities: The existing
WWT facilities consist of two alum sludge settling lagoons.
f. Description of proposed WWT facilities: N/A
g. Possible toxic impacts to surface waters: Effluents from WTPs have been found to
exhibit toxic characteristics.
h. Pretreatment Program (POTWs only): N/A
2. Residual handling and utilization/disposal scheme: Alum sludge is currently disposed at
the county landfill.
3. Treatment Plant Classification: Class I
4. SIC Code(s): 4941
Wastewater Code(s): 21
5. MTU Code(s): 50001
PART III - OTHER PERTINENT INFORMATION
Is this facility being constructed with Construction Grant Funds or are any public monies
involved (municipals only)? This facility was constructed with public monies.
2. Special monitoring or limitations (including toxicity) requests: None at this time.
3. Important SOC/JOC or Compliance Schedule dates: N/A

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4. Alternative Analysis Evaluation
a. Spray Irrigation: Insufficient area.
b. Connect to regional sewer system: The City has rejected the introduction of this
wastewater into their collection system.
c. Subsurface: Insufficient area
d. Other disposal options: N/A
PART IV - EVALUATION AND RECOMMENDATIONS
The Permittee, City of Shelby is requesting renewal of its NPDES permit to discharge
supernatant from two alum sludge settlings basins.
The wastewater is generated from the filter backwash and decant from the alum residuals
lagoons. The filter backwash is de -chlorinated by sodium thiosulfate prior to being discharged to
the alum residuals lagoons.
The facilities were in good operational condition at the time of the site inspection.
Pending review and approval by P&E, it is recommended that the permit be renewed as
requested.
Signature of Report Pr parer Date
Water Quality Regional Supervisor Date