NC0020354_Denial_20040507

NPDES DOCUHENT SCANNING COVER SHEET
NC0020354
Pittsboro WWTP
NPDES Permit:
Document Type:
Permit Issuance
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Complete File - Historical
Engineering Alternatives (EAA)
Correspondence
Owner Name Change
Denial
Instream Assessment (67b)
Speculative Limits
Environmental Assessment (EA)
Document Date:
May 7, 2004
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May 7, 2004
Mr. David Hughes, PE
Town Manager
P.O. Box 759
Pittsboro, NC 27312
Dear Mr. Hughes:
Michael F. Easley, Governor
State of North Carolina
William G. Ross, Jr., Secretary
Department of Environment and Natural Resources
Alan W. Klimek, P.E., Director
Division of Water Quality
Subject: NPDES Modification Request
Permit No. NC0020354
Pittsboro WWTP
Chatham County
The Division received your request for modification of the above -mentioned permit on April 6, 2004. You
requested removal of the nickel limit on the basis that weekly samples collected over the past year
showed low effluent levels. While most of the samples collected did show low values of nickel (< 10
µg/L), the Pittsboro WWTP exceeded its weekly average permit limit of 25.0 µg/L on November 11, 2003.
The value recorded on that day was 27 Ag/L. Since the value was exceeded, the Division cannot remove
the nickel limit. The nickel limit and monitoring requirements will remain as is currently required in
the existing permit.
If you have any questions or need additional information, please contact Toya Fields via the phone
number or email address listed below.
Sincerely,
an W. Klimek, P.E.
cc: NPDES file
Raleigh Regional Office/ Water Quality Section
North Carolina Division of Water Quality
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
tova.fieldsColncmail,net [phone] x551
FAX [phone]
On the Internet at http://h2o.enr.state.nc.us/

REASONABLE POTENTIAL ANALYSIS
Pittsboro WWTP
NC0020354
Time Period Jan 2003 - Feb 2004
Qw (MGD) 0.75
7010S (cfs) 0
7010W (cfs) 0.4
3002 (cfs) 0.6
Avg. Stream Flow, OA (cfs) 11
Reeving Stream Roberson Creek
WWTP Class III
!WC (%) @ 7010S 100
@ 7Q 10W 74.4
@ 3002 65.957
@ OA 9.5581
Stream Class WS-IV NSW
Outfall 001
Qw = 0.75 MGD
PARAMETER
TYPE
(I)
STANDARDS &
CRITERIA (2)
POL
Units
REASONABLE POTENTIAL RESULTS
RECOMMENDED ACTION
NC 1V05/
Chronic
SFAY /
Acute
n
Spat Alex Pred Cw ARo..bk Cw
Arsenic
NC
50
ug/L
0
l Acute: WA
0 l WA
Chronic: 50
Beryllium
C
6.5
ug/L
0
0 l N/A
Acute: WA
Chronic: 10
Cadmium
NC
2
15
uryL
0
Acute: 15
0 N/A
Chronic 2
—
Chromium
NC
50
1,022
ury'L
0
0 N/A
Acute: 1,022
Chronic: ___50
— — — — — — _
Copper
NC
7
AL
7.3
u{0L
0
-71 N/A
Acute: 7
_ _ —___•^--_—_—_-----_—_------_•—•—_—•—•_
Chronic: 7
Cyanide
NC
5
N
22
10
ugIL
0
0
N/A
Acute: 22
___.—___—•_•_•—•—•_•_•----_•_•_•—.—__
Chronic: 5
Fluoride
NC
1,800
u:;_
0
0
WA
ACule: NIA
Chronic: 1800 _—_—_—_—_—_—_—_—_—_—_—_—_—_---_—_—
Lead
NC
25
N
33. 3
ug/L
0
0
WA
Acute: 34
Mercury
NC
0,012
0,0002
ug/L
0
0
N/A
Acute: WA
_ _ _—___._.____—_____—___—_—______________
Chronic:.O
Molybdenum
A
3.500
unit.
0
0
WA
Acute: WA
Chronic: 36,618 •—•—•_•—•—•_•_•—•—•------_-------
Nickel
NC
25
261
ug/L
48
2
46.7
Acute: 261
_ ______
Chronic: 25
_ _ _ _ _ _ _ _ _ _
Retain current permit limns and monitoring requirements
Phenols
A
300
N
ug/L
0
0
WA
Acute: N/A
_ _ _ __•__—_---_---_—_—_—_—_—_—•—•—_---._
Chronic: 3.139
Selenium
NC
5,0
56
ug/L
0
Acute 56
0 WA
Chronic-.__— _'___'_'___'_'---------------------
Silver
NC
006
AL
1 22
r:r:L
0
Acute 1
0 NIA
Chronic 0
____—________
Zinc
.0
50
AL
67
i, , _
0
Acute: 67
n
Chronic.-----_—'-----------'---------•—'—_—'—'—
' Legend:
C = Carcinogenic
NC = Non -carcinogenic
A= Aesthetic
Freshwater Discharge
NC0020354 mod requestxts, rpa
5/7/2004

REASONABLE POTENTIAL ANALYSIS
11
Nickel
Date Data BDL=1/2DL Results
1 Feb-2004 < 10 5.0 Std Dev. 3.3028
2 < 10 5.0 Mean 5.5313
3 < 10 5.0 C.V. 0.5971
4 < 10 5.0 n 48
5 Jan-2004 < 10 5.0
6 < 10 5.0 Mult Factor = 1.7300
7 ,< 10 5.0 Max. Value 27.0 ug/L
8 < 10 5.0 Max. Pred Cw 46.7 ug/L
9 Dec-2003 < 10 5.0
10 < 10 5.0
11 < 10 5.0
12 < 10 5.0
13 < 10 5.0
14 Nov-2003 < 10 5.0
15 27 27.0
16 < 10 5.0
17 < 10 5.0
18 Oct-2003 < 10 5.0
19 < 10 5.0
20 < 10 5.0
21 < 10 5.0
22 Sep-2003 < 10 5.0
23 < 10 5.0
24 < 10 5.0
25 < 10 5.0
26 < 10 5.0
27 Aug-2003 < 5 2.5
28 < 10 5.0
29 < 10 5.0
30 < 10 5.0
31 Jul-2003 11 11.0
32 < 10 5.0
33 < 10 5.0
34 < 10 5.0
35 Jun-2003 < 10 5.0
36 < 10 5.0
37 < 10 5.0
38 < 10 5.0
39 < 10 5.0
40 May-2003 < 10 5.0
41 < 10 5.0
42 < 10 5.0
43 < 10 5.0
44 Apr-2003 < 10 5.0
45 < 10 5.0
46 < 10 5.0
47 < 10 5.0
48 < 10 5.0
NC0020354 mod_request.xls, data
- 1 - 5/7/2004

TOWN OF
NANC
Mayor R. MAY
Mayor �vIR1 r I
DAVID B. HUGHES, P.E. p � 00 )03SP
Town Manager
PAUL S. MESSICK, JR.
Town Attomey
P.O. Box 759 — 635 East Street
PITTSBORO. N.C. 27312
April 1, 2004
NCDENR
DWQ
1617 Mail Service Center
Raleigh, NC 27699-1617
Attn: NPDES Unit
BOARD OF COMMISIONERS
GENE BROOKS
MAX G. COTTEN
BURNICE N. GRIFFIN, JR.
CHRIS WALKER
CLINTON E. BRYAN, JR.
TELEPHONE
[phone]
FAX [phone]
The Town Of Pittsboro requests the Division re-evaluate the Nickel data to determine if the limit
can be eliminated.
The Town Of Pittsboro has sampled for Nickel on a monthly basis from February 2002 through
January 2003 and weekly thereafter. All sampling data indicate <10ug1 with the exception of three
(3) sampling events. These events occurred May 31, 2002 (10 ugl), July 6, 2003 (11 ugl), November
11, 2003 (27 ugl).
Thank you for your assistance in this matter.
0-64/0.
DAVID HUGHES, PE
Town Manager
CHARTERED 1787