NC0023736_LTMP_20041029

Michael F. Easley, Governor
William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
Alan W. Klimek, P.E. Director
Division of Water Quality
October 29, 2004
MONTE WALL
PRETREATMENT COORDINATOR
PO BOX 958
LENIOR NC 28645
Subject: Pretreatment Review of Industrial User Pretreatment Permit
Program: City of Lenoir
Caldwell County
NPDES #: NC0023981/Lower Creek & NC0023736/Gunpowder Creek
Dear Mr. Wall:
The Pretreatment Unit of the Division of Water Quality has reviewed the Long Term Monitoring Plans
submitted by the City of Lenior for the Gunpowder Creek WWTF and the Lower Creek WWTF. These
submissions were received on October 23, 2004.
The review indicates that the LTMPs are adequate and meets the requirements needed to establish a
site -specific Headworks Analysis (HWA). Proper implementation of an LTMP is also required by Part III
(B), of your NPDES permit. Please refer to the Comprehensive Guidance for North Carolina
Pretreatment Programs (Comprehensive Guide) for additional information and examples. Some
additional notes resulting from the LTMP review follow.
LTMP Data Summary: Comprehensive Guide, Appendix 4-B Sample collection and
laboratory analysis must be done as outlined in this LTMP.
2. Division Review of Data: As your LTMP data is accumulated, organized, and analyzed, the
Division may request to review tabulated data and to see chain of custody forms and
laboratory data sheets.
Thank you for your continued cooperation with the Pretreatment Program. If you have any
questions or comments, please contact Jon Risgaard at [phone] ext. 580 [email:
j on.risgaard @ ncmail.net] .
Sincerely,
Alan W. Klimek, P.E.
jrr/lenior.LTMP.01
cc: Central Files
Jon Risgaard, Pretreatment Unit
Jim Reid, ARO
Nne
orthCarolina
NwUrll dil
NC DWQ/PERCS Unit 1617 Mail Service Center Raleigh, NC 27699-1617 Phone [phone] Customer Service
Internet: h2o.enr.state.nc.us/Pretreat/index.html 512 N. Salisbury St. Raleigh, NC 27604 FAX [phone]
An Equal Opportunity/Affirmative Action Employer— 50% Recycled/10% Post Consumer Paper

City of Lenoir Gunpowder Creek WWTP
Headworks Long Term Monitoring Plan
A. Sampling Points (See Figure 1)
PFERCS UNIT
1 - Influent - prior to mixing with side streams - use regular composite sample
collected for NPDES monitoring
2 - Effluent - after all treatment including chlorination - use regular composite sample
collected for NPDES monitoring
3 - Activated Sludge Basin - collect a grab sample from each basin - combine these
into one sample using a portion of each according to volume of WWTP flow
4 - Sludge to Disposal - sample sludge going to final disposal
5 - SIUs — locations described in IUPs
B. Pollutants of Concern (P O C) Reason for Inclusion•
NPDES - POTW NPDES Permit limit
Sludge - 40 CFR 503 Sludge Land Application
EPA - EPA Required
IUP - SIU Industrial User Permit Limit
POC
List
NPDES
Required
Pollutants
40 CFR 503 Sludge
Required
Pollutants
EPA, NC
Required
Pollutants
SIU
Limited
Pollutants
Flow
Flow
Flow
BOD5
BOD5
BOD5
TSS
TSS
TSS
NH3
NH3
NH3
As
As
Cd
Cd
Cd
Cd
Cd
Cr
Cr
Cr
Cr
Cr
Cu
Cu
Cu
Cu
Cu
CN
CN
Pb
Pb
Pb
Pb
Pb
Hg
H
Mo
Mo
Ni
Ni
Ni
Ni
Ni
Se
Se
Se
A
A
A
Zn
Zn
Zn
Zn
Zn
Fluoride
F
F
Total P
TP
TKN
TKN
% Solids
% Solids
Sludge to
-.disposal flow
Sludge to disposal
flow
rile Lenoir_ Gunpowder Creek LTMP_Oct 2004 Page 1
Printed: October 18, 2004, 10:17 AM
Modeled after: Chapter 4, Appendix 4-A. DWQ Model Revision Date: July 29, 2004

City of Lenoir Gunpowder Creek WWTP
Headworks Long Term Monitoring Plan
C. Flow
Flow monitoring points are indicated on the attached facility diagram, see Figure 1. Flow at
effluent (Pt. 2) and SNs (Pt. 5) will be monitored during sampling events. Flow or volume of
sludge to disposal (Pt. 4) can either be monitored or calculated.
D. SIU Monitoring
Significant Industrial User monitoring will be conducted per industrial user permit (lUP).
Additionally, extra SIU sampling will be performed such that all SNs are sampled for all
LTMP POCs at least once per year.
E. LTMP Sampling Frequency for Full Programs — Option 1)
Sampling Point
Frequency
1- Influent
Quarterly on a Workday and per NPDES requirement
2- Effluent
Quarterly on a Workday and per NPDES requirement
3- Activated Sludge Basin
Once per six months
4- Sludge to Disposal
I Per Sludge Permit and 503 re ulations
5- SIU's
--]
Per SIU Permit and all POC's once er year
F. Sampling Plan
Pollutant
Influent
Effluent
Aeration
(Pt.3)
Sludge
(Pt. 4)
SNs
(Pt. 5)
BOD
X
X
X
TSS
X
X
X
X
NH3 as N
X
X
X
X
As
X
X
X
X
Cd
X
X
X
X
Cr
X
X
X
X
Cu
X
X
X
X
CN
X
X
X
X
Pb
X
X
X
X
Hg
X
X
X
X
Mo
X
X
X
X
Ni
X
X I
X
X
Se
X
X
X
X
Ag
X
X
X
X
Zn
X
X
X
X
Total P
X
X
X
TKN
X
X
X
Flow
X
X
X
%solids
X
rile Lenoir_(iunpowder Creek LTMP_Oct 2004 Page 2
Printed: October 18, 2004, 10:18 AM
Modeled after: Chapter 4, Appendix 4-A. DWQ Model Revision Date: July 29, 2004

City of Lenoir Gunpowder Creek WWTP
Headworks Long Term Monitoring Plan
G. Detection Level and Sample Method
P.O.C.
Detection Level (m 1) *
Sample Method **
BOD
2
24 hr Composite
TSS
2
24 hr Com osite
NH3 as N
0.1
24 hr Composite
As
0.01
24 hr Composite
Cd
0.002
24 hr Composite
Cr
0.005
24 hr Composite
Cu
0.002
24 hr Composite
CN
0.01
Grab
Pb
0.01
24 hr Composite
H -effluent
1 ng/l (method 1631)
Grab
Hg-all other
locations
0.0002 (method 245.1)
24 hr Composite
Mb
0.1
24 hr Composite
Ni
0.01
24 hr Composite
Se
0.008
24 hr Composite
Ag
0.005
24 hr Composite
Zn
0.01
24 hr Composite
Total P
0.01
24 hr Composite
TKN 10.1
24 hr Composite
Sampling, preservation, and analytical method must be from 40 CFR 136.
* Graphite Furnace Determinations are required to attain the desired detection level for the
metals. However, analysis of Aeration Basin and Sludge to Disposal samples often cannot meet
these detection levels. In this case, analysis of these samples must obtain a detection level at
least as stringent as the applicable inhibition criteria or sludge ceiling standard.
** All Aeration Basin and Sludge to Disposal samples will be grab.
File Lenoir —Gunpowder Creek LTMP_Oct 2004 Page 3
Printed: October 18, 2004, 10:18 AM
Modeled after: Chapter 4, Appendix 4-A. DWQ Model Revision Date: July 29, 2004
'004

REIC'EIVED
H. MfWTP Diagram
Step
City of Lenoir Gunpowder Creek WWTP
Headworks Long Term Monitoring Plan
Influent
Bar Screen
...........
Grit . . ....
...........
Removal
Sludge
Waste Sludge
(only one tank
shown)
OCT 2004
P
P E R S U N IT
Sludge to
Disposal
(Trucked to
Lower Creek
WWT-P)
SBR #1 &
Chlorine ------- 1
#2 Decant
S02 Disinfect
Dechlorination
To Gunpowder
Creek
Sampling Points
I — influent
2 — Effluent (After Chlorination and
Dechlorination)
3 — Activated Sludge Basins
4 — Sludge to Disposal
File Lenoir_Gunpowder Creek — LTMP—Oct 2004 Page 4
Printed: October 18, 2004, 10:35 AM
Modeled after: Chapter 4, Appendix 4-A. DWQ Model Revision Date: July 29, 2004