NC0025305_Wasteload Allocation_19930601

NPDES WASTE LOAD ALLOCATION
PERMIT NO.: NCO025305
PERMITTEE NAME: University of North Carolina at Chapel Hill
FACILTI'Y NAME: Steam Electric Power Plant
Facility Status: Existing
Permit Status: Renewal
Major Minor �1
Pipe No.: 001
Design Capacity: 0.072 MGD
Domestic (% of Flow):
Industrial (% of Flow):
100 %
Comments:
CpA<Lef -7jjLr6el H-
RECEIVING STIZEANLan unnamed tnbutary to Morgan Creek
Class: C-NSW
Sub -Basin: 03-06-06
Reference USGS Quad: D22NE (please attach)
County; O!range
Regional Office: Raleigh Regional Office
Previous Exp. Date: 7/31/93 Treatment Plant Class: I
Classification changes within three miles:
Requested by: Charles Alvarez Date: 2/18/93
Prepared by:. Date: 5 ZS f 3
Reviewed by: QM Date:.S 3 i
we�a [n/a
Modeler
JDateRec.
#
:tAb I
Z
Xa 'i3
0
Drainage Area (mil ) O.p¢ Avg. Streamflow (cfs): D. O
7Q10 (cfs) 0. 0 Winter 7Q10 (cfs) 6.0 30Q2 (cfs)
Toxicity Limits: IWC 90 % PIF AgawXChronic
Instream Monitoring:
Parameters A114
Upstream Location
Downstream Location
Effluent
Characteristics
vc,.
WhAehum
nn FWX
BOD5 (mg/1)
NH3-N (mg/1)
D.O. (mg/1)
TSS (mg/1)
30
/00
F. Col. (/100 ml)
pH (SU)
6 '
,� itam
SO
So
Mom// h✓
i c /:zoo
Cnmmrntc-

0.617.ztit(7o
�3a,GD�
G9���/rKe lmi�'GrQr�� 4i•��Co��.,xr; a,•%+,-�a�,,�v��Tsr
ids ,1 /Orl C/41L� �%Ec.M ✓�-L��
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M
Facility Name:
NPDES No.:
Type of Waste:
Facility Status:
Permit Status:
Receiving Stream:
Stream Classification:
Subbasin:
County:
Regional Office:
Requestor:
Date of Request:
Topo Quad:
OR 2 8 1993
FACT SHEET FOR WASTELOAD ALLOCATION
DEHNR-RAL RO
Request # 7340
University of North Carolina
at Chapel Hill/Steam Electric Power Plant
NC0025305
Industrial - 100%
Existing
Renewal
UT to Morgan Creek
C-NSW
030606
Orange
Stream Characteristic:
Raleigh
USGS # 0209750610
Alvarez
Date: 1988
2/18/93
n
Drainage Area (mi2): 0.04 :a
D22NE
Summer 7Q10 (cfs): 0.0 n
Winter 7Q10 (cfs): 0.0 -<
Average Flow (cfs): 0.0
IWC (%): 100
Wasteload Allocation Summary
(approach taken, correspondence with region, EPA, etc.)
According to DonnellyA(RRO), this facility has substantially completed their new generation unit,
so a WET test (chronic @90%) will be given. Also, a limit of 50 µg/1 is recommended for total
chromium. No other changes are recommended.
Special Schedule Requirements and additional, comments from Reviewers:
feC exn.'rtr 7vn# .?-)_ /993, lac:lif. A,,/�/ k. .0e A
ItY..nn-,e7I
Reviewed by
Instream Assessment
Regional Supervisor
Permits & Engineerir
z/
Date: 93
Date: �i L
RETURN TO TECHNICAL SERVICES BY: MAY 2 6 1993

PARAMETERS
Existine Limi
Daily Avg
Daily Max.
Wasteflow (MGD):
monitor
Temperature (0Q:
monitor
Total Chromium (mg/1):
0.2
0.2
Total Zinc (mg/1):
1.0
1.0
TSS (mg/1):
&
30.0
100.0
o- Zo.
o
Oil Grease (mg/1):
_30 0'/J�O
+00
_ py
pH (Si):
6.0-9.0
Total Copper (mg/1):
1.0
1.0
TP (mg/1):
monitor
IN (mg/1):
monitor
Total Iron (mg/1):
1.0
1.0
Total Residual Chlorine (µg/l):
200
Recommended Limits:
Mon. Avg
Daily Max.
WQ/EL,
Wasteflow (N4GD):
monitor
Temperature (°C):
monitor
Total Chromium (µg/1):
50
50
WQ
Total Zinc (mg/1):
1.0
1.0
EL
TSS (mg/1):
30.0
100.0
EL
Oil & Grease (mg/1):
_3GO /5 O
}0" zo .o
EL
pH (Si):
6.0-9.0
WQ
Total Copper (mg/1):
1.0
1.0
EL
TP (mg/1):
2.0*
WQ
TN (mg/1):
monitor
Total Iron (mg/1):
1.0
1.0
EL
Total Residual Chlorine (µg/1):
200
W F L
Chronic Toxicity**:
P/F @90%
*Compliance based on a quarterly average of weekly samples.
**WET testing should be done Jan, Apr, Jul, Oct.
Limits Changes Due To: Parameter(s) Affected
Change in 7Q10 data
Change in stream classification
Relocation of discharge
Change in wasteflow
Other (onsite toxicity study, interaction, etc.)
Instream data
New regulations/standards/procedures x Cr, WET test at 90%
New facility information (effluent data)
x Parameter(s) are water quality limited. For some parameters, the available load capacity of
the immediate receiving water will be consumed. This may affect future water quality based
effluent limitations for additional dischargers within this portion of the watershed.
•2
— No parameters are water quality limited, but this discharge may affect future allocations.

MISCELLANEOUS INFORMATION & SPECIAL CONDITIONS
AAd quacy of Existing Treatment
Has the facility demonstrated the ability to meet the pro sed new limits, with existing treatment
facilities? Yes_ Now Bvf j{,e ro»e ;�^ of CC"I`Y✓c%n� c F�,:/,�,e.,
SL'U 0(16w fao'/,'fy to wez� 1 � ff
If no, which paraineters cannot be met?
Would a "phasing in" of the new limits be appropriate? Yes _ No A
If yes, please provide a schedule (and basis for that schedule) with the regional
office recommendations:
If no, why not?
10C ex(J ref Jvn i
Special Instructions or Conditions
93,
Wasteload sent to EPA? (Major) _ (Y or N)
(If yes, then attach schematic, toxics spreadsheet, copy of model, or, if not modeled, then old
assumptions that were made, and description of how it fits into basinwide plan)
Additional Information attached? (Y or N) If yes, explain with attachments.

a
Facility Name �C" C A� h&f91a4^hr-Permit # Pipe #
CHRONIC TOXICITY PASS/FAIL PERMIT LIMIT (QRTRLY)
The effluent discharge shall at no time exhibit chronic toxicity using test procedures outlined in:
1.) The North Carolina Ceriodaphnia chronic effluent bioassay procedure (North Carolina Chronic Bioassay
Procedure - Revised *September 1989) or subsequent versions.
The effluent concentration at which there may be no observable inhibition of reproduction or significant mortality
is -20 % (defined as treatment two in the North Carolina procedure document). The permit holder shall perform
quarterly monitoring using this procedure to establish compliance with the permit condition. The first test will be
performed after thiny days from the effective date of this permit during the months of
./ r ✓E/ &� . Effluent sampling for this testing shall be performed at the NPDES
permitted finfile uent discharge below all treatment processes.
All toxicity testing results required as part of this permit condition will be entered on the Effluent Discharge
Monitoring Form (MR-1) for the month in which it was performed, using the parameter code TGP3B.
Additionally, DEM Form AT I (original) is to be sent to the following address:
Attention: Environmental Sciences Branch
North Carolina Division of
Environmental Management
4401 Reedy Creek Road
Raleigh, N.C. 27607
Test data shall be complete and accurate and include all supporting chemical/physical measurements performed in
association with the toxicity tests, as well as all dose/response data. Total residual chlorine of the effluent toxicity
sample must be measured and reported if chlorine is employed for disinfection of the waste stream.
Should any single quarterly monitoring indicate a failure to meet specified limits, then monthly monitoring will
begin immediately until such time that a single test is passed. Upon passing, this monthly test requirement will
revert to quarterly in the months specified above.
Should any test data from this monitoring requirement or tests performed by the North Carolina Division of
Environmental Management indicate potential impacts to the receiving stream, this permit may be re -opened and
modified to include alternate monitoring requirements or limits.
NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum control organism
survival and appropriate environmental controls, shall constitute an invalid test and will require immediate
retesting(within 30 days of initial monitoring event). Failure to submit suitable test results will constitute
noncompliance with monitoring requirements.
7Q10 D• 0.
cfs
Permitted Flow
MGD
IWC ado
%
Basin & Sub -basin
034o6 C4�
Receiving Stream OTC
Anrfm �'�
County
Recommended Y.
Z"
QCL P/F Version 9191

✓:yr/
%PR 2. 9 1993
SOC Priority Project Yes XXX No
SOC No. 89-70 Ad IV
To: Permits and Engineering Unit
Water Quality Section
Attention: Charles Alvarez
I Date April 19, 1993
NPDES STAFF REPORT AND RECOMMENDATION
County Oranoe
Permit No. NC0025305 RENEWAL
MCIO,cK
09&*
iECNi4:'r '.
PART I - GENERAL INFORMATION
1 1. Facility and'Address:
University of North Carolina at Chapel Hill
Steam Electric Generating Plant
CB# 1800, Giles F. Horney Building
Chapel Hill, NC 27599-1800
2. Date of Investigation: April 14, 1993
3. Report Prepared by: Ted Cashion, Environmental Chemist I
Michael Wicker, Environmental Engineer II
4. Persons Contacted and Telephone Number:
Ray DuBose 919-962-1167
Phil McDonald 919-962-1309
5. Directions to Site: From Raleigh: I-40 West, Take 54 East
exit, straight through Town, facility is on the left.
6. Discharge Point(s), List for all discharge points:
Latitude: 35254'18" Longitude: 79°03'42"
Attach a USGS map extract and indicate treatment facility
site and discharge point on map.
U.S.G.S. Quad No. D22NE U.S.G.S. Quad Name Chapel Hill, NC
7. Site size and expansion area consistent with application ?
XXX Yes No If No, explain: Limited area is
available for expansion
B. Topography (relationship to flood plain included):
Facility appears to be located on relatively flat to
minutely sloped area out of floodplain.

9.- Location of nearest dwelling: Facility is located in a
residential area with the closest resident approximately 75
feet.
.10. Receiving stream or affected surface waters: U.T. to Morgan
Creek
a. Classification: WS-IV NSW
b. River Basin and Subbasin No.: 03:06:06
C. Describe receiving stream features and pertinent
downstream uses: Dry ditch through residential
area. OWASA WWTP discharge is approximately 4
miles downstream.
PART II - DESCRIPTION OF DISCHARGE AND TREATMENT WORKS
1. a. Volume of Wastewater to be permitted: 0.092234 MGD(Ultimate
Design Capacity)
b. What is the current permitted capacity of the Waste
Water Treatment facility? 0.0702 MGD
C. Actual treatment capacity of the current facility
(current design capacity)? 0.092234 MGD
d. Date(s) and construction activities allowed by previous
Authorizations to Construct issued in the previous two
years: None issued in the past 2 years.
e. Please provide a description of existing or
substantially constructed wastewater treatment
facilities:
oil/water separator, 106,400 gallon equalization basin,
caustic rapid mix tank, polymer feed system, 2 settling
tanks, acid rapid mix tank, 3" Parshall flume, 2 storm
water detention ponds
f. Please provide a description of proposed wastewater
treatment facilities: NA
g. Possible toxic impacts to surface waters: pH excursions
have occurred in the past.

h. Pretreatment Program (POTWs only): NA
in development_
approved_
should be required
not needed
2. Residuals handling and utilization/disposal scheme:
a. If residuals are being land applied, please specify DEM
permit no.
,r• Residuals Contractor- Laidlaw Environmental
Telephone No. 919-342-6106
b. Residuals stabilization: PSRP
PFRP Other
C. Landfill: Solids are taken to Smyrna, Tennessee
d. Other disposal/utilization scheme (Specify): NA
3. Treatment plant classification (attach completed rating
sheet) :
4. SIC Code(s): 4911
Wastewater Code(s) of actual wastewater, not particular
facilities i.e.., non -contact cooling water discharge from a
metal plating company would be 14, not 56.
Primary 14, 16, 17 Secondary 68, 73, 79
Main Treatment Unit Code: 53202
PART III - OTHER PERTINENT INFORMATION
1. Is this facility being constructed with Construction Grant
Funds or are any public monies involved. (municipals only)? NA
2. Special monitoring or limitations (including toxicity)
requests: None
' 3. Important SOC, JOC or Compliance Schedule dates: (Please
indicate)
Date
Comply with final limits 930622

•A.. Alternative. Analysis Evaluation: Has the facility evaluated
all of the non -discharge options available. Please provide
regional perspective for each option evaluated.
Spray Irrigation: NA
Connection to Regional Sewer
sent to OWASA; balance of the
accepted by OWASA since it is
Facility is still negotiating
flow.
Subsurface: NA
Other disposal options: NA
System: A portion of waste is
flow will probably not be
mostly cooling/stormwater.
with OWASA to accept more
5. Other Special Items: None
PART IV - EVALUATION AND RECOMMENDATIONS
The Raleigh Regional Office has performed a site evaluation and
has reviewed information submitted for renewal of the permit.
The facility has undergone extensive renovation and improvements.
Because of the upgrade, the facility is now rated as a Class II.
Appropriate monitoring for this class facility should be included
in- the permit. The proposed SOC 89-70 Ad IV was sent to the
Water Quality Section on April 14, 1993 for review and execution
by the Director. The SOC will require compliance with all permit
limits by June 22, 1993.
Oinsite stormwater is collected in 3 areas. Parking lot and
maintenance storage areas drain to 2 separate stormwater
detention ponds designed for containing the first 1" of rainfall
per Town of Chapel Hill requirements. The detention ponds
discharge is combined with the process wastewater discharge at a
common discharge point. The stormwater from rains which fall
directly in the coal handling and ash silo areas is collected and
treated through the wastewater treatment facility. Since
effluent sampling is taken at the common discharge location, the
monitoring required for the process wastewater should be adequate
for all stormwater monitoring.

The RRO recommends that the permit be reissued in accordance with
the basinwide permitting strategy with appropriate monitoring and
limitations as required.
Signature of report preparers
Water Qua ty Regional Sup rvisor
C //
Date