NC0074268_Site Visit_20150521

SOC Priority Project: No
To: Complex Permitting Unit
Attention: Teresa Rodriquez Date: May 13, 2015
NPDES STAFF REPORT AND RECOMMENDATIONS
County: Gaston
NPDES Permit No.: NC0074268
PART I -GENERAL INFORMATION
1. Facility and Address: Crowders Creek WWTP Physical Location
City of Gastonia 5642 York Highway RECEIVEDI0 NRIDWR
PO Box 1748 South of Gastonia
Gastonia,N.C. 28053-1748
MAY 2 1 2015
2. Date of Investigation: May 12, 2015 Water Quality
Permitting Section
3. Report Prepared By: Wes Bell,Environmental Specialist
4. Person Contacted and Telephone Number: Sibyl Brotherton/ORC [phone] and David
Shellenbarger/Asst. Division Manager of Compliance [phone]
5. Directions to Site: From the junction of Interstate I-85 S and Exit 17 (US-321 SN Chester Street),turn
right on US-321 S/Chester Street/York Highway for approximately 9 miles and turn right on the
WWTP's driveway(just after crossing the bridge over Crowders Creek).
6. Discharge Point(s), List for all discharge Point:
Outfall 001 (Google Earth)
Latitude: 35° 10' 10"
Longitude: 81° 11'46"
See USGS Map included with the renewal application for specific location of the outfall.
USGS Quad No.: G 14 NW
7. Receiving Stream or Affected Surface Waters: Crowders Creek
a. Classification: C
b. River Basin and Subbasin No.: Catawba 03-08-37
PART II -DESCRIPTION OF DISCHARGE AND TREATMENT WORKS
1. a. Volume of wastewater and description of wastewater source(s) of each outfall:
Outfall 001 —6.0 MGD—domestic and industrial (8 SIUs with 4 being CIUs). The existing WWT
facilities consist of mechanical bar screen with manual bypass, instrumented flow measurement, grit
removal, influent pump station, dual primary clarifiers, dual biological nutrient removal trains
(anaerobic/anoxic/oxic cells), dual secondary clarifiers, dual polishing ponds, gas chlorination, gas
dechlorination,post aeration, dual DAF units, anaerobic digestion, and standby power.

Page Two
b. Pretreatment Program: The City implements an approved pretreatment program.
PART III - OTHER PERTINENT INFORMATION
1. Special monitoring or limitations (including toxicity)requests:
The City requests the following permit changes:
1) Total Nitrogen and Total Phosphorus limits be expressed as lbs/day limits and nutrient credits be
applied to this permit for the previous connection of the City of Bessemer City WWTP that was
previously detailed/requested in the City of Gastonia's letter to the Division dated 6/23/14 (letter
attached to the renewal package).
2) Reduction of the effluent monitoring frequencies for BOD, TSS,ammonia, and fecal coliform
according to the Division's criteria for exceptionally performing facilities(data attached to
renewal package).
3) Reduction'of the instream monitoring requirements to once per week year-round.
4) Reduction of the monthly monitoring requirement for effluent mercury to quarterly and the
removal of the effluent mercury limit.
5) Removal of the quarterly monitoring requirement for effluent bis(2-ethylhexy)phthalate.
6) Removal of the quarterly monitoring requirements for effluent nickel, copper, and silver.
PART IV-EVALUATION AND RECOMMENDATIONS
The WWTP appeared to be properly operated and well maintained at the time of the inspection. The
WWTP's effluent was clear with no suspended solids or foam with fish being observed in the effluent
discharge. City personnel have previously discussed with the Division's Permitting Staff regarding the
incorporation of nutrient limits and credits for the NPDES facilities that have or will soon to be connected to the
City's WWTPs. It is recommended that the subject Permit be renewed following review by the Division's
Complex Permitting Staff.
it—Z-
.,-",
1/1 5
Signature o eport Preparer Date
e..-4.1 .-) . /24 SX.g/s-"--
Water Quality Regional Supervisor Date