NC0020338_Permit Modification_20101105

NPDES DOCUMENT SCANNING COVER SHEET
NC0020338
Yadkinville WWTP
NPDES Permit:
Document Type:
Permit Issuance
Wasteload Allocation
Authorization to Construct (AtC)
- - "-yg► F=;,; .- '"= a,..a
Permit Modification ' -
Speculative Limits
Correspondence
Instream Assessment (67B)
Environmental Assessment (EA)
Permit
History
Document Date:
November 5, 2010
This document is printed on reuse paper. - igpiiore any
content on the resrernse'side

ArA
NCDENR
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Beverly Eaves Perdue Coleen H. Sullins Dee Freeman
Governor ! Director Secretary
November 5, 2010
Mr. Thomas Gray, DRC
Town of Yadkinville
213 Van Buren Street
P.O. Drawer 816
Yadkinville, North Carolina 27055-0816
Subject: NPDES Permit Modification
Permit No. NC0020338
Yadkinville WWTP
Yadkin County
Dear Mr. Gray:
The Division of Water Quality (DWQ) has reviewed your request for modification of the
subject permit by deletion of the effluent limits for total mercury. In the permit issued on
December 29, 2009, supplemental conditions allowed a review of twenty four datapoints to
determine if reasonable potential to exceed the allowable concentration still existed.
A review of the discharge monitoring reports submitted to the Division of Water Quality
provided the data used in the updated reasonable potential analysis. Based on results of the
analyses, the following changes have been made to this permit:
■ The limit foT. total mercury has been deleted from the permit. All reported values for
mercury between January 2010 through September 2010 indicated no reasonable
potential to exceed the allowable effluent concentration. Based on current Division of
Water Quality procedure, quarterly monitoring for mercury will be required based on
the maximum predicted concentration determined in the analysis.
No other cianges to the permit have been made.
Please find enclosed the amended effluent page for outfall 001, which should be
inserted into your permit. The old page should be discarded. This permit is issued pursuant
to the requirements of North Carolina General Statute 143-215.1 and the Memorandum of
Agreement between North Carolina and the U.S. Environmental Protection Agency. Please
1617 Mail Service Center, Raleigh, North Carolina 27699-1617
Location: 512 N. Salisbury St. Raleigh, North Carolina 27604
Phone: [phone] FAX: [phone] \ Customer Service:1-877-623.6748
Internet: www.ncwaterquality.org
An Equal Opportunity \ Affirmative Action Employer
No Carolina
atura!ly

take notice that this permit is not transferable. Part II. E.4. addresses the requirements to be
followed in case of change in ownership or control of this discharge.
If you have any questions or need additional information, please contact Jacquelyn M.
Nowell at telephone number [phone].
Sin erely,
oleen H. Sullins, Director
Attachments
cc: EPA/Region IV (ecopy))
Winston-Salem Regional Office/Surface Water Protection Section (ecopy)
ESS/Aquatic Toxicology Unit (ecopy)
Technical Assistance and Certification Unit (ecopy)
ESS/Carrie Ruhlman (ecopy)
PERCS/Attn: Monti Hassan (ecopy)
NPDES File/NC0020338
Central Files

Permit No. NC0020338
A. (1) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS - FINAL
During the period beginning on the effective date of this permit and lasting until expiration, the Permittee is authorized
to discharge from outfall 001. Such discharges shall be limited and monitored by the Permittee as specified below:
n
EFFLUENT
CHARACTERISTICS
_
DISCHARGE LIMITATIONS
•
MONITORING REQUIREMENTS
Monthly
Average
Weekly
Average
Daily
Maximum
Measurement
Frequency
Sample
Type
Sample Location'
Flow 1
2.5 MGD
Continuous
Recording
Influent or Effluent
BOD, 5-day, 20°C
(April 1 — October 31)2
16.0 mg/L
24.0 mg/L
3/week
Composite
Influent & Effluent
BOD, 5-day, 20°C
November 1 — March 31)2
30.0 mg/L
45.0 mg/L
3/week
Composite
Influent & Effluent
Total Suspended Solids2
30.0 mg/L
45.0 mg/L
3/week
Composite
Influent & Effluent
NH3-N
(April 1— October 31)
2.0 mg/L
6.0 mg/L
3/week
Composite
Effluent
NH3-N
(November 1 — March
31)
4.0 mg/L
12.0 mg/L
3/week
Composite
Effluent
Dissolved Oxygen3
3/week
Grab
Effluent, U, D
pH4
3/week
Grab
Effluent
Total Residual Chlorines
28 µg/L
3/week
Grab
Effluent
Temperature °C 1
Daily
Grab
Effluent
Temperature °C 1
3/week
Grab
U, D
Fecal Coliform
200/100 ml
400/100 ml
3/week
Grab
Effluent, U, D
Oil and Grease
Quarterly
Grab
Effluent
Conductivity
3/week
Grab
Effluent, U, D
Total Nitrogen
(NO2+NO3+TKN)
Weekly
Composite
Effluent
Total Phosphorus
Weekly
Composite
Effluent
Total Copper
•
2/Month
Composite
Effluent
Cyanide°
10 µg/L
22 µg/L
Weekly
Grab
Effluent
Total Mercury
Quarterly
Grab
Effluent
Total Zinc
2/Month
Composite
Effluent
Chronic Toxicity?
Quarterly
Composite
Effluent
NOTES:
1. U: upstream at the Old U.S. 421 crossing. D: downstream at the NCSR 1510 crossing and at the NCSR 1146
crossing, Upstream and downstream samples shall be grab samples collected 3/Week during the months of June,
July, August, anai September and Weekly during the remaining months of the year.
2. The monthly a'ferage effluent BOD5 and Total Suspended Solids concentrations shall not exceed 15% of their
respective influent value (85% removal).
3. The daily average dissolved oxygen concentration in the effluent shall not be less than 5.0 mg/L.
4. The pH shall noit be less than 6.0 standard units or greater than 9.0 standard units.
5. The Division shall consider all effluent total residual chlorine values reported below 50 µg/1 to be in compliance
with the permit. However, the Permittee shall continue to record and submit all values reported by a North
Carolina certified laboratory (including field certified), even if these values fall below 50 µg/l.
6. The quantitation level for cyanide (CN) shall be 10 µg/L. CN levels reported as less than 10 µg/L shall be
considered zero for compliance purposes.
7. Chronic Toxicity (Ceriodaphnia) P/F @ 50%; January, April, July, and October; See condition A(2) of the
Supplement to Effluent Limitations and Monitoring Section of this permit.
THERE SHALL BE NO DISCHARGE OF FLOATING SOLIDS OR VISIBLE FOAM IN OTHER THAN TRACE
AMOUNTS.

I'OWN 0
1L1 AKIN V I[1{ JT
"A TOWN IN PROGRESS"
September 27, 2010
NCDENR
Division of Water Quality
C/o Ms. Jacquelyn Nowell
1617 Mail Service Center
Raleigh, N.C. 27699-1617
Dear Ms. Nowell,
The Town of Yadkinville Waste Water Treatment Facility received a "Discharge Permit" on
December 29, 2009 from the Division of Water Quality modifying our mercury testing from
quarterly to twice per month. To date, our Facility has met this requirement for a total 24
samples. The test results confirm that the limit has remained below the 24.0 ng/L. Below are
the 24 sample dates and their results:
Jan-10 Feb-10
Mar-10 Apr-10
1.55 ng/L
1.62 ng/L
1.38 ng/L
2.98 ng/L
4.15 ng/L
213 Van Buren Street
Post Office Drawer 816
Yadkinville, North Carolina 27055-0816
1.68 ng/L
2.14 ng/L
2.02 ng/L
2.96 ng/L
2.16 ng/L
2.76 ng/L
2.17 ng/L
1.87 ng/L
2.6 ng/L
1.58 ng/L
3.55 ng/L
F--
, ,...:, ,....;,,... .., i
-.„., !-,f ..
-.....
[Pa l...._.-. ._...-_�..._
f
SEP 302010
CILTiZTV
POINT t�C °URC.:.i 3! ANCH
2.92
1.78
2.07
3.62
5.2
ng/L
ng/L
ng/L
ng/L
ng/L
3.83 ng/L
3.72 ng/L
Telephone [phone]
Fax [phone]

I am requesting that the Division of Water Quality reevaluate mercury data to determine
whether our Facility can eliminate this limit and resume our quarterly sampling/testing. Your
consideration will be much appreciated.
Sincerely,
Thomas Gray, ORC

REASONABLE POTENTIAL ANALYSIS
5
6
1
1
1
Yadkinville WWTP
NC0020338
Qw (MGD)
1Q10S (ds)
7Q1OS (ors)
7Q10W (cla)
2.50
3.26
3.90
10.00
9002 (ces) 12.30
Avg. Stream Flow, QA Ws) 35.90
RBcYing Stream North Deep Creak
WW7P Class IV
iMIC (%) ®1Q1OS 54.34
7Q10S 49.84
7Q1OW 27.93
30Q2 23.96
QA 9.74
Stream Claw WS-IV
Outrall 9
Qw=2.5MGD
PARAMETER
8
TYPE
STANDARDS
PQI.
Unto
REASONABLE POTENTIAL RESULTS
RECOMMENDED ACTION
a CRITERIA (2)
NCMO3/Crook
KFAV/Amto
a
et1A. mProd a A4aeolNCw
Cyanide
NC
5
FW
22
10
up/L
0
0
WA
MAW 40
_---__ _-------__-----_—__--_—_—__.--.
Chronic 10
Fluoride
NC
'
1800.0
FW
uyL
0
0
WA
Acute: WA
_--__----_----_--_—_—_-----_—..
C�— —hrnaic3812
Mercury
NC
12
FW
1
nglL
25
25
15.1
Acute: WA
_---_ --
CMonic 24
_ _ _ _—.
No RP to ;used atuor4c o3owable. Per OWO pros •
max prod >SO% of chronic. Qz ity mon. recommends
Molybdenum
NC
2000
HM
u90.
0
0
WA
Acute: N/A
- ___ __— __--.-----_._._--_—_—__._.—_—_—..
Chronic 4013
Monona Compounds
NC
300
A
uglL
0
0
WA
A it WA
_------ ._.—._._--------.__—_—_--_---.
Chronic 1252
Selenium
NC
5
FW
58
uplL
0
0
WA
Acids: 103
_ _ _ -- ._ —_�._--_—_—_--._._--_--_._.---_.
Chronic 10
Arsenic
C
50
FW
ugIL
0
0
WA
Acute WA
_ _ _. _._------__-_--_—_—._._----_—..
Chronic: 100
Arsenic
C
10
MB
uWL
0
0
WA
Acute WA
_ _-_ _.—___-__---_—.._._--_—_—._.-----._..
Chronic 103
Berytllum
NC
7
FW
uplL
0
0
WA
Acute: N/A
_ __---__ ---_---._.—_---_—._
Chronic: 13
---- _------.
0 Cadmium
NC
2
FW
15
uyll
0
0
WA
Acute: 28
_ ___ _._-__--,._--_—_--_._.—_—_--_.__----
Chronic 4
I Chromium
NC
50
FW
1022
upL
0
0
NIA
Acute: 1581
—.—.-----..----------.—____.--------
Chronic: 100
z CQPPer(AL)
NC
7.0
FW
7.3
uylL
0
0
N/A
Acute: 13
- - —•— -----•-----------•------------.
Chronic 14
S Lead
NC
25
FW
33.8
u9L
0
0
WA
Acute: 82
_ _ — -----._.---_-----._----.._•—.--
Chronic 50
4 Nickel
NC
88
FW
281
u9A.
0
0
WA
Acute 480
------.---------------.-------.-------.--
Chronic 17
5 Sliver (AL)
NC
0.05
FW
1.23
ugL
0
0
WA
Acute: 228
_ ---__ _.-----._._
Chrunic� 0.12
-------_•-----__.—..
8 Zinc (AL)
NC
50
FW
87
uglL
0
0
WA
Acute 123
- _---__—._-------_._•-----._-------_-.
Chronic 100
7 CMorides
NC
230000
FW
WI-
0
0
WA
Acute: NIA
_ --. __----____._„_—_—_—.__—
Chronic 461.484
------- _..
8
upl1
0
0
WA
Acute WA
---
Chronic 4NALUEI
---._._.-------_._.—.---_—._..
19
u9L
0
0
WA
Acute: NIA
—
Chrordc SVALUEI
---.�•—.-----.—.�------.—.�..
20338h9tpa2010.rasm,rpa
10/22/2010

REASONABLE POTENTIAL ANALYSIS
3
Mercury
Date Data BDL=1/2DL Results
1 Jan-2010 1.55 1.6 Std Dev. 1.4492
2 1.62 1.6 Mean 2.8960
3 1.38 1.4 C.V. 0.5004
4 Feb-2010 1.68 1.7 n 25
5 2.14 2.1
6 Mar-2010 2.16 2.2 Mult Factor = 1.9100
7 2.76 2.8 Max. Value 7.9 ng/L
8 Apr-2010 2.92 2.9 Max. Pred Cw 15.1 ng/L
9 1.78 1.78
10 2.07 2.07
11 3.62 3.62
12 5.20 5.20
13 May-2010 2.98 2.98
14 4.15 4.15
15 Jun-2010 2.02 2.02
16 2.96 2.96
17 Jul-2010 2.17 2.17
18 1.87 1.87
19 2.60 2.60
20 1.58 1.58
21 3.55 3.55
22 Aug-2010 3.83 3.83
23 3.72 3.72
24 Sep-2010 4.21 4.21
25 7.88 7.88
26
27
28
29
30
31
32
20338hgrpa2010.xlsm, data
- 1 - 10/22/2010

701- Ill, Z� 9
REASONABLE POTENTIAL ANALYSIS 7.4/ott f'
Yadkinville WWTP
NC0020338
Time Period 1/2006-8/2009
Qw (MGO) 2.5
7Q10S (cfs) 3.9
7Q1OW (cis) 10
3002 (cfs) 12.3
Avg. Stream Flow, QA (cfs) 35.9
Rec'bing Stream North DeepCreek
WWTP Class IV
!WC (96) :w' TQ10S 49.839
7Q10W 27.928
3002 23.957
QA 9.7423
Stream Class WS-IV
Outfall 001
Qw=2.5MGD
PARAM
ETER
TYPE
(<)
STANDARDS &
CRITERIA (2)
PQL
Units
REASONABLE POTENTIAL RESULTS
RECOMMENDED ACTION
n ODA Ma ProdQr AllowablrAr
/CADS/ %FAY/
Chart Acute
Arse-uc
C
10
ug/L
30 0
2.5
Acute: N/A
_
hro Cnic _—_103
All values below detection level. _ -----..
No RPshown to exceed the chronic allowable conc.
No limit or monitoring in permit. Continue in LTMP
Aluminum
C
6500.0
can.
29 19
398.0
Acute: NIA
__ _
Chronic 66,719
_-- _ _ _—_----,
No RP shown to exeeod the chronic allowable coot.
No limit or monitoring in permit
Cadmium
NC
2 15
ug/L
30 0
0.5
Acute: 15
_ _
_hro Cn---ic 4_ —_
All values betow detection level. _ _ _ _ _
No RP to exceed the nic chroor acute allowable conc.
No limit or mordtodng in permit. Continue in LTMP
Chrorrim
NC
50 1,022
ug/L
30 0
2.5
Acute: 1,022
_ _ _ _
Chronic -100
All values below detection tevel. _ _ _ _ — _ — _,
'No RP to exceed the chronic or acute allowable conc.
No limit or monitoring in permit. Continue in LTMP
coPlaer
NC
7 AL 7.3
uglL
88 86
69.3
Acute: 7
_ Ti
Chro_nic:-- _ 1
Copper is NC action level standard.
RP is shown to exceed chronic and acute allowable cones.
However b/c no toxktty testing failures in past Fran.
Cu not thought to be causative. Continue 2/mo monitortn
Cyanide
NC
5 N 22
10
ug/L
152 21
50.4
Acute: 22
_ --__ __
Chronic 10
_ _- _- _ _ __ _ __—_
RP is shown to exceed chronic and acute allowable cons.
Recommend wk avg and da max Units in permit.
Fluoride
NC
1,800
ug/L
144 144
2,280.0
Acute: N/A
Ch_on_:-_3_12_
_,
No RP _owto_ex—e_th_ch_roni_ato_e —o_n—_—
No limit or monitoring in permit.
uie
d
NC
25 N 33.8
uglL
151 0
2.5
Acute: 34
__ _
Chronic_50
All vahres below_ detection level. _ _ ----_
No RP toxc eeed thic or acute allowable conc.
No limit or monitoring in permit. Continue in LTMP
Mercury
NC
12
2.0000
nglL
30 30
48.0240
Acute: NIA
_ _--__ __
Chronic 24
_ -_ _- _ _--- —.,
RP is shown to exceed chronic allowable ooncentrationm.
Recommend weekly avg limit in the permit.
Molybdenum
A
3,500
uglL
0 0
N/A
Acute: N/A
-_ 10 _-------_—_—_—_—_—_—_—_—_—_—_—_,
Chronic: 14,6
Nikkei
NC
88 261
ug/L
30 1
98.7
Acute: 261
_ _---__ —
Chronic 177
to Neartyailvatues_belowdetectionlevel.-_---_--,
No RP exceed the chronic or acute aiowable conc.
No limit or martkodng in permit. Continue in LTMP
Total Phenolics
A
300 N
uglL
30 4
261.5
Acute: N/A
__-_ _______—_____—_—___,
Chronic 1,252
No RP shown to exceed chronic allowable concentration.
'
Selenium
I
NC
5.0 56
ug/L
30 0
5.0
Acute: 56
_ _ — _ _ _
Chronic 10
Alt values below_ detection level. _ _ _ - _ ---
No RP to exceed the chronic or acute allowable conc.
No limit or monitoring in permit Continue in LTMP
Silver
NC
0.06 Al. 1.23
uglL
87 1
15.6
Acute: 1
_ _ _ --_ _ _ —
ChronIc 0
Silver is_ NC_ action level standard. Nearly ail values BDL-
Although RP shown not be&eved to exceedllow a. Conn
No Omit or monitoring recommended per BPJ
Zinc
NC
50 AL 67
uglL
87 87
321.0
Acute: 67
_ _ _ _ _ _ _
Chronic 100
Zinc is NC action level standard.
RP is shown_ to exceed chronic and acute allowable cones.
However b/c no toxicity testing Fdiures to past 5-years,
Zn not thought to be causative. Continue 2/mo monitoring
• Legend:
C a Carcinogenic
NC = Non -carcinogenic
A Aesthetic
" Freshwater Discharge
20338totalphenolscorectedads, rpa
10/22/2010

NC0020338 - Yadkinville
REASONABLE POTENTIAL ANALYSIS
9
Mercury
Date Data BDL=1/2DL Results
1 Jan-2007 3.9 3.9 Std Dev. 3.4250
2 3.25 3.3 Mean 4.5251
3 3.77 3.8 C.V. 0.7569
4 Apr-2007 7.08 7.1 n 55
5 7.28 7.3
6 8.91 8.9 Mult Factor = 1.86
7 Jul-2007 3.96 4.0 Max. Value 23.2 ng/L
8 4.22 4.2 Max. Pred Cw 43.2 ng/L
9 4.9 4.9
10 Oct-2007 6.7 6.7
11 Oct-2007 23.2 23.2
12 Oct-2007 8.0 8.0
13 Jan-2008 4.5 4.5
14 5.0 5.0
15 5.5 5.5
16 Apr-2008 8.6 8.6
17 7.4 7.4
18 6.7 6.7
19 Jul-2008 4.8 4.8
20 5.7 5.7
21 4.6 4.6
22 Oct-2008 3.8 3.8
23 4.4 4.4
24 11.4 11.4
25 Jan-2009 , 5.2 5.2
26 4.7 4.7
27 . 4.4 4.4
28 2.5 2.5
29 3.4 3.4
30 3.5 3.5
31 Jan-2010 1.55 1.0
32 1.62 1.0
33 1.38 1.0
34 Feb-2010 1.68 1.0
35 2.14 2.1
36 Mar-2010 2.16 2.2
37 2.76 2.8
38 Apr-2010 2.92 2.9
39 1.78 1.0
40 2.07 2.1
41 3.62 3.6
42 5.20 5.2
43 May-2010 2.98 3.0
44 4.15 4.2
45 Jun-2010 2.02 2.0
46 2.96 3.0
47 Jul-2010 2.17 2.2
48 1.87 1.0
49 2.60 2.6
50 1.58 1.0
51 3.55 3.6
52 Aug-2010 3.83 3.8
53 3.72 3.7
54 Sep-2010 4.21 4.2
55 7.88 7.9
56
57
58
59
60
20338totalphenolscorrected.xls, data
- 1 - 10/22/2010

NC0020338 - Yadkinville
REASONABLE POTENTIAL ANALYSIS
9
Mercury
Date Data BDL=1/2DL Results
1 Jan-2007 Std Dev. 2.2343
2 Mean 3.8084
3 C.V. 0.5867
4 Apr-2007 n 43
5
6 Mult Factor = 1.78
7 Jul-2007 Max. Value 11.4
8 Max. Pred Cw 20.3
9
10 Oct-2007
11 Oct-2007
12 Oct-2007
13 Jan-2008 4.5 4.5
14 5.0 5.0
15 5.5 5.5
16 Apr-2008 8.6 8.6
17 7.4 7.4
18 6.7 6.7
19 Jul-2008 4.8 4.8
20 5.7 5.7
21 4.6 4.6
22 Oct-2008 3.8 3.8
23 4.4 4.4
24 11.4 11.4
25 Jan-2009 5.2 5.2
26 4.7 4.7
27 4.4 4.4
28 2.5 2.5
29 3.4 3.4
30 3.5 3.5
31 Jan-2010 1.55 1.0
32 1.62 1.0
33 1.38 1.0
34 Feb-2010 1.68 1.0
35 2.14 2.1
36 Mar-2010 2.16 2.2
37 2.76 2.8
38 Apr-2010 2.92 2.9
39 1.78 1.0
40 2.07 2.1
41 3.62 3.6
42 5.20 5.2
43 May-2010 2.98 3.0
44 4.15 4.2
45 Jun-2010 2.02 2.0
46 2.96 3.0
47 Jul-2010 2.17 2.2
48 1.87 1.0
49 2.60 2.6
50 1.58 1.0
51 3.55 3.6
52 Aug-2010 3.83 3.8
53 3.72 3.7
54 Sep-2010 4.21 4.2
55 7.88 7.9
56
20338totalphenolscorrected.xls, data
- 1 - 10122/2010