NC0040070_Fact Sheet_20150112

PV
DENR / DWR / NPDES
EXPEDITED FACT SHEET - NPDES PERMIT DEVELOPMENT
NPDES Permit NCO040070
Derek Denard, Compliance & Expedited Permitting Unit / 919-807-6307 12Jan20I5
Facility Information
Applicant/Facility Name
City of Gastonia — Two Rivers Utilities WTP
Alum De -watering Facility
Applicant Address
P.O. Box 1748, Gastonia, NC 28053
Facility Address
298 West Page Avenue, Gastonia, NC 28052
Permitted Flow (MGD)
Not limited
Type of Waste
Water Plants and Water Conditioning Discharge —filter-backwash
- Conventional WTP System
Facility Class
PC-1
County
Gaston
Permit Status
Renewal
Regional
Office
MRO
Stream Characteristics
Receiving Stream
UT to Long Creek
Stream Classification
C
Stream Segment
[11-129-16-(4)]
Drainage basin
Catawba
Summer 7Q10 (cfs)
0
Subbasin
03-08-36
Winter 7Q10 (cfs)
0
Use Support
Aquatic Life
30Q2 (cfs)
0
303(d) Listed
Impaired for
Turbidity
Average Flow (cfs)
0
State Grid
F14SW
IWC (%)
100%
USGS Topo Quad
Gastonia North, NC
Facility Summary
This facility is a conventional technology water treatment plant [coagulation, flocculation, sedimentation,
and filtration] with discharge of wastewaters from media filter backwash and sedimentation basins with a
design potable flowrate of 23.30 MGD and a wastewater discharge of 0.75 MGD. Because the waste flow
is >50k gpd, continuous flow monitoring is required. The facility consists of the following water and
wastewater treatment units:
• coagulation
• disinfection equipment
• two (2) 0.600 MG sedimentation basin
• filtration
• alum sludge de -watering facility
• dechlorination equipment
• chemical usage consists of
o aluminum sulfate
o sodium hypochlorite
o sodium hydroxide
o sodium bicarbonate
o hexameta-phosphate
Fact Shcet
RencN+al 2015 -- N D1S Permit N00040070
Payc I

0 orthophosphate
o fluoride
o polymer
o sodium thiosulfate
Monthly age FLOW (MGD) — Backwash or reject flow 0.75(MAX).
Eligibility for Coverage Under the General Permit NCG590000 — The Two Rivers Utilities Water
Treatment Plant (WTP) is not eligible for the general permit because there is not enough toxicity data. At
least one permit cycle of toxicity data for is needed to determine eligibly.
Toxici — With an IWC >0.25%, this permit requires Chronic Whole Effluent Toxicity (WET) testing
using Ceriodaphnia dubia to be performed as a 7-day pass/fail test at 90% effluent concentration, during
January, April, July and October [TGP3B].
For Renewal — This permit reflects discharge at Outfall 001. DWR updated the facility description and
Map; added parameter codes to Section A. (L); added Electronic Reporting - Discharge Monitoring
Reports page [Section A. (2.)]; changed flow monitoring to Continuous and Recording; added quarterly
Total Zinc monitoring; and added weekly Turbidity monitoring with limit.
Stream — Discharge from WTP for outfall 001 is into the an unnamed tributary to Long Creek [Stream
Segment 11-129-16-(4)]. The segment is currently listed in the 2012 North Carolina 303(d) List as
impaired for Turbidity.
RPA — A RPA was not conducted. The most recent data was in February 2006 for Iron and Aluminum.
Fact Shcct
Renoal 2015 -- NPDI;S NOW40070
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