NC0069841_Permit (Issuance)_20090907

NPDES DOCUMENT SCANNING COVER SHEET
NPDES Permit:
NC0069841
Crooked Creek WWTP
Document Type:
Permit Issuance`~
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Complete File - Historical
Engineering Alternatives (EAA)
Correspondence
Owner Name Change
Technical Correction
Instream Assessment (67b)
Speculative Limits
Environmental Assessment (EA)
Document Date:
September 7, 2009
This document is printed on reuse paper - ignore any
content on the rezrernse side

ern
NCDENR
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Beverly Eaves Perdue Coleen H. Sullins Dee Freeman
Governor Director Secretary
September 7, 2009
Mr. Mark Tye
Union County Public Works
500 North Main Street, Suite 500
Monroe, NC 28112
Subject: Issuance of NPDES Permit NC0069841
Crooked Creek WWTP #2
Union County
Dear Mr. Tye:
Division personnel have reviewed and approved your application for renewal of the subject
permit. Accordingly, we are forwarding the attached NPDES discharge permit. 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 dated October 17,
2007 (or as subsequently amended.)
This final permit includes no major changes from the draft permit sent to you on July 15, 2009.
The final permit does contain the same changes recognized in the draft permit which
differed from your current permit as follows:
• A provisional limit has been added for tetrachloroethylene. Results from a Priority Pollutant
Analysis submitted by this facility showed a tetrachloroethylene value greater than the
allowable instream concentration. As a result, the facility will be required to perform monthly
tetrachloroethylene monitoring. If 12 consecutive monthly samples are below the detection
limit for this parameter, you may request to have the permit requirements removed. If no
request is made, a tetrachloroethylene limit of 18 ug/L will go into effect after 18 months.
• A requirement to perform an annual Priority Pollutant Analysis was added on the
Effluent and Monitoring page, Section A. (1.). Specific parameters and reporting
procedures are listed under Section A. (3.) Effluent Pollutant Scan.
• A requirement to monitor zinc on a monthly sampling frequency was added on the
Effluent and Monitoring page, Section A. (1.) . The monitoring requirement was
based on the results from the PPA which showed levels of zinc exceeding North
Carolina's chronic and acute standards:
• The wording in Section A. (2.) has been changed and the following paragraph added:
If the Permittee monitors any pollutant more frequently then required by this
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 1 Affirmative Action Employer
One
NorthCarohna
Natural!,

permit, the results of such monitoring shall be included in the calculation and
reporting of the data submitted on the Discharge Monitoring Report and all AT
Forms submitted.
• Footnote under Section A. (1). on fecal coliform calculation was dropped but
requirement for determining geometric mean remains and procedure is detailed in
Part II.
North Fork Crooked Creek is listed as an impaired stream on North Carolina's 303 (d) list.
Currently, the stream does not meet all water quality standards. If the limitations in the current
permits for facilities discharging to North Fork Crooked Creek do not result in improved water quality,
removal of discharges to North Fork Crooked Creek may be necessary for the health of the stream.
Although the Division believes multiple sources of wastewater cause degradation to North Fork
Crooked Creek, we will continue to monitor compliance at your facility. If noncompliance with your
permit's effluent limits is shown to be a direct cause of stream degradation, the Division will
recommend removal of your facility's discharge.
If any parts, measurement frequencies or sampling requirements contained in this permit are
unacceptable to you, you have the right to an adjudicatory hearing upon written request within thirty
(30) days following receipt of this letter. This request must be in the form of a written petition,
conforming to Chapter 150B of the North Carolina General Statutes, and filed with the office of
Administrative Hearings, 6714 Mail Service Center, Raleigh, North Carolina 27699-6714. Unless such
a demand is made, this permit shall be final and binding.
Please take notice that this permit is not transferable. The Division may require modification
revocation and reissuance of the permit. This permit does not affect the legal requirements to obtain
other permits which may be required by the Division of Water Quality or permits required by the
Division of Land Resources, Coastal Area Management Act, or any other Federal or Local governmental
permits may be required.
If you have questions concerning this permit, please contact Julie Grzyb by e-mail
([e-mail]) or phone at [phone].
Sir erely,
oleen H. Sullins
Enclosure NPDES Permit NC0069841 (Final)
cc: NPDES Unit
Central Files
Mooresville Regional Office / Surface Water Protection
e-copy:
Aquatic Toxicology Unit
ESS, Carrie Ruhlman
EPA Region 4 (Final Permit and fact sheet)
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 1 Affirmative Action Employer
NorthCarolina
atural/j

Permit NC0069841
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
• DIVISION OF WATER QUALITY •
PERMIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
In compliance with the provision of North Carolina General Statute 143-215.1, other lawful standards and
regulations promulgated and adopted by the North Carolina Environmental Management Commission,
and the Federal Water Pollution Control Act, as amended,
Union County
is hereby authorized to discharge wastewater from a facility located at
Crooked Creek WWTP #2
4015 Sardis Church Road
off of SR 1515
Monroe, NC
Union County
to receiving waters designated as North Fork Crooked Creek in the Yadkin Pee -Dee River Basin in
accordance with effluent limitations, monitoring requirements, and other conditions set forth in Parts I, II,
III and IV hereof.
This permit shall become effective October 1, 2009.
This permit and authorization to discharge shall expire at midnight on January 31, 2014.
Signed this day September 7, 2009.
Col: en H. Sullins, Director
sion of Water Quality
By Authority of the Environmental Management Commission

Permit NC0069841'
SUPPLEMENT TO PERMIT COVER SHEET
All previous NPDES Permits issued to this facility, whether for operation or discharge are hereby revoked. As of this permit
issuance, any previously issued permit bearing this number is no longer effective. Therefore, the exclusive authority to operate and
discharge from this facility arises under the permit conditions, requirements, terms, and provisions included herein.
Union County is hereby authorized to:
1. Continue operation of an existing 1.9 MGD wastewater treatment system, consisting of the
following treatment units:
• Six influent pumps
• Mechanical bar screen
• Manual bar screen (back-up)
• Dual oxidation ditches with six aerators
• Four circular secondary clarifiers
• Six high rate tertiary rapid sand filters
• UV disinfection system
• Two chlorine contact basins (optional)
• Dechlorination vault (optional)
• Cascade post aeration system
• Five aerobic (mechanical) sludge digesters
• Holding tanks with 2.0 MG total capacity
• Supplemental alkalinity feed system
• One effluent pump station with three pumps
The facility is located at the Crooked Creek Wastewater Treatment Plant, 4015 Sardis Church Road,
off of SR 1515 in Union County.
2. Discharge treated domestic wastewater from said treatment works at the location specified on the '
attached map through outfall 001 into North Fork Crooked Creek which is classified C waters in the
Yadkin -Pee Dee River Basin.

Latitude: 35°05'47" USGS Quad #:
Longitude: 80°35'53" G16SE/Bakers
Union County Public Works Department -
Crooked Creek WWTP #2
Receiving Stream:
Stream Classification:
River Basin:
Sub -Basin #:
County:

Permit NC0069841
A. (1) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
During the period beginning on the effective date of the permit and lasting until expiration, the
Permittee is authorized to discharge treated wastewater from outfall 001. Such discharges shall be
limited and monitored by the Permittee as specified below:
s LIMITS
MONITORING: REQUIREMENTS T
PARAMETER
Monthly
Average -
Weekly -
: Average`
•'''Daily'• .
Average-
.Measurement
Frequency -
'Sample .
' ' Type' .
:. Sample'
Locafionl '''
Flow
1.9 MGD
Continuous
Recording
Influent or
Effluent
BOD, 5-day, 20 °C2
(April 1-October 31}
5.0 mgfl
7.5 mgfl
31Week
Composite
Influent &
Effluent
BOD, 5-day, 20 °C2 (November 1-
March 31)Effluent
10.0 mg/1
15.0 mgll
3/Week
Composite
Influent &
Total Suspended Solids2
30.0 mg/145.0
mgfl
3/Week
Composite
Influent &
Effluent
NH3-I
(April 1- October 31)
2.0 mg/I
6.0 mgiL
-
3/Week
Composite
Effluent
NH3-N
(November 1- March 31)
4.0 mg/I
12.0 mg/L
3/Week
Composite
Effluent
Total Residual Chlorine3
17 pg/L
28 Ng/L
3/Week
Grab
Effluent
Dissolved Oxygen
Daily average > 6.0 mg/L
3/Week
Grab
Effluent
Fecal Coliform (geometric mean)
200/100 ml
400/100 ml
3/Week
Grab
Effluent
Temperature
Daily
Grab
Effluent
Total Nitrogen (NO2 + NO3 + TKN)
Monthly
Composite
_
Effluent
Total Phosphorus
Monthly
Composite
Effluent
Total Copper
Monthly
Composite
Effluent
Total Zinc
Monthly
Composite
Effluent
Tetrachloroethylene4
18 pglL
Monthly
Composite
Effluent
Chronic Toxicity5
Quarterly
Composite
Effluent
Effluent Pollutant Scan6
Annually
Composite
_
Effluent
pH
> 6.0 and < 9.0 standard units
3/Week
Grab
Effluent
Dissolved Oxygen
Variable
Grab
U & D
Fecal Coliform (geometric mean)
Variable
Grab
U & D
Temperature
Variable
Grab
U & D
Conductivity
Variable
_ Grab
U & D
Footnotes:
1. U: upstream 50 feet from the outfall. D: downstream 'A mile below discharge and at SR 1514. Instream
samples shall be grab samples collected three times per week during June, July, August, and September and
once per week during the rest of the calendar year. Instream monitoring is provisionally waived in light of the
permittee's participation in the Yadkin -Pee Dee River Basin Association. Instream monitoring will be
immediately reinstated should the permittee end its participation in the Association.
2. The monthly average effluent BOD5 and Total Suspended Solids concentrations shall not exceed 15% of the
respective influent value (85% removal).
3. TRC limit and monitoring requirement only apply if chlorine is used for disinfection. The Permittee shall report
all effluent TRC values reported by a NC -certified laboratory [including field -certified]. Effluent values below 50
Ng/L will be treated as zero for compliance purposes.
4. The tetrachloroethylene limit will take effect 18 months after the permit becomes effective. If 12 months of
samples are below the detection limit, the facility may request to have the limit and monitoring requirements
removed from the permit.
5. Chronic Toxicity (Ceriodaphnia) P/F at 90%: February, May, August, and November (see A. (2)).
6. Effluent Pollutant Scan annually for all parameters listed in A. (3).
There shall be no discharge of floating solids or foam visible in other than trace amounts.

Permit NC0069841
A. (2) CHRONIC TOXICITY PERMIT LIMIT (Quarterly)
The effluent discharge shall at no time exhibit observable inhibition of reproduction or significant mortality to
Ceriodaphnia dubia at an effluent concentration of 90 %.
The permit holder shall perform at a minimum, auarterlu monitoring using test procedures outlined in the "North
Carolina Ceriodaphnia Chronic Effluent Bioassay Procedure," Revised February 1998, or subsequent versions or
"North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure" (Revised -February 1998) or subsequent
versions. The tests will be performed during the months of February, May, August, and November. Effluent sampling for
this testing shall be performed at the NPDES permitted final effluent discharge below all treatment processes.
If the test procedure performed as the first test of any single quarter results in a failure or ChV below the
permit limit, then multiple -concentration testing shall be performed at a minimum, in each of the two
following months as described in "North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure"
(Revised -February 1998) or subsequent versions.
The chronic value for multiple concentration tests will be determined using the geometric mean of the highest
concentration having no detectable impairment of reproduction or survival and the lowest concentration that does
have a detectable impairment of reproduction or survival. The definition of "detectable impairment," collection
methods, exposure regimes, and further statistical methods are specified in the "North Carolina Phase II. Chronic
Whole Effluent Toxicity Test Procedure" (Revised -February 1998) or subsequent versions.
All toxicity testing results required as part of this permit condition will be entered on the Effluent Discharge
Monitoring Form (MR-1) for the months in which tests were performed. If reporting pass/fail results using the
parameter code TGP3B, DWQ Form AT-1 (original) is sent to the below address. If reporting Chronic Value results
using the parameter code THP3B, DWQ Form AT-3 (original) is to be sent to the following address:
Attention: NC DENR / Division of Water Quality
Environmental Sciences Section
1621 Mail Service Center
Raleigh, North Carolina 27699-1621
Completed Aquatic Toxicity Test Forms shall be filed with the Environmental Sciences Section no later than 30
days after the end of the reporting period for which the report is made.
Test data shall be complete, accurate, include all supporting chemical/physical measurements and all
concentration/response data, and be certified by laboratory supervisor and ORC or approved designate signature.
Total residual chlorine of the effluent toxicity sample must be measured and reported if chlorine is employed for
disinfection of the waste stream.
Should there be no discharge of flow from the facility during a month in which toxicity monitoring is required, the
permittee will complete the information located at the top of the aquatic toxicity (AT) test form indicating the facility
name, permit number, pipe number, county, and the month/year of the report with the notation of "No Flow" in the
comment area of the form. The report shall be submitted to the Environmental Sciences Section at the address
cited above.
Should the permittee fail to monitor during a month in which toxicity monitoring is required, monitoring will be
required during the following month.
Should any test data from this monitoring requirement or tests performed by the North Carolina Division of Water
Quality indicate potential impacts to the receiving stream, this permit may be re -opened and modified to include
alternate monitoring requirements or limits.
If the Permittee monitors any pollutant more frequently then required by this permit, the results of such monitoring
shall be included in the calculation and reporting of the data submitted on the DMR and all AT Forms submitted.
NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum control organism
survival, minimum control organism reproduction, and appropriate environmental controls, shall constitute an
invalid test and will require immediate follow-up testing to be completed no later than the last day of the month
following the month of the initial monitoring.

Permit NC0069841
A. (3) EFFLUENT POLLUTANT SCAN
The Permittee shall perform an annual Effluent Pollutant Scan for all parameters listed in the attached table. The
analytical methods shall be in accordance with 40 CFR Part 136 and shall be sufficiently sensitive to determine
whether parameters are present in concentrations greater than applicable standards and criteria. Samples shall
represent seasonal variations. Unless otherwise indicated, metals shall be analyzed as "total recoverable."
Ammonia (as N)
Trans-1,2-dichloroethylene
Bis (2-chloroethyl) ether
Chlorine (total residual, TRC)
1,1-dichloroethylene
Bis (2-chloroisopropyi) ether
Dissolved oxygen
1,2-dichloropropane
Bis (2-ethylhexyl) phthalate
• Nitrate/Nitrite
1,3-dichloropropylene
4-bromophenyl phenyl ether
Kjeldahl nitrogen
Ethylbenzene
Butyl benzyl phthalate
Oil and grease
Methyl bromide
2-chloronaphthalene
Phosphorus
Methyl chloride
4-chlorophenyl phenyl ether
Total dissolved solids
Methylene chloride
Chrysene
Hardness
1,1,2,2-tetrachbroethane
Di-n-butyl phthalate
Antimony
Tetrachloroethylene
Di-n-octyl phthalate
Arsenic
Toluene
Dibenzo(a,h)anthracene
Beryllium
1,1,1-trichloroethane
1,2-dichlorobenzene
Cadmium
1,1,2-trichloroethane
1,3-dichlorobenzene
Chromium
Trichloroethylene
1,4-dichlorobenzene
Copper
Vinyl chloride
3,3-dichtorobenzidine
Lead
Acid -extractable compounds:
Diethyl phthalate
Mercury
P-chloro-m-cresol
Dimethyl phthalate
Nickel
2-chlorophenol
2,4-dinitrotoluene
-
Selenium
2,4-dichlorophenol
2,6-dinitrotoluene
Silver
2,4-dimethylphenol
1,2-diphenylhydrazine
Thallium
4,6-dinitnro-cresol
Fluoranthene
Zinc
• 2,4-dinitrophenol
Fluorene
Cyanide
2-nitrophenol
Hexachlorobenzene
Total phenolic compounds
4-nitrophenol
Hexachlorobutadiene
Volatile organic compounds:
Pentachlorophenol
Hexachlorocyclo-pentadiene
Acrolein
Phenol
Hexachloroethane
Acrylonitrile
2,4,6-trichlorophenol
Indeno(1,2,3-cd)pyrene
Benzene
Base -neutral compounds:
Isophorone
Bromoform
Acenaphthene
Naphthalene
Carbon tetrachloride
Acenaphthylene
Nitrobenzene
Chlorobenzene
Anthracene
N-nitrosodi-n-propylamine
Chlorodibromomethane
Benzidine
N-nitrosodimethylamine
Chloroethane
Benzo(a)anthracene
N-nitrosodiphenylamine
2-chloroethylvinyl ether
Benzo(a)pyrene
Phenanthrene
Chloroform
3,4 benzofluoranthene
Pyrene
Dichlorobromomethane
Benzo(ghi)perylene
1,2,4-trichlorobenzene
1,14ichioroethane
• Benzo(k)fluoranthene
•
•
1,2-dich!oroethane
Bis (2-chloroethoxy) methane
Test results shall be reported to the Division in DWQ Form- A MR-PPA1 or in a form approved by the Director
within 90 days of sampling. The report shall be submitted to the following address:
NC DENR / DWQ / Central Files
1617 Mail Service Center
Raleigh, NC 27699-1617

Grzyb, Julie
From: [e-mail]
Sent: Monday, July 20, 2009 8:55 AM
To: [e-mail]
Subject: re NC0069841, Crooked Creek WWTP #2
EPA has no comments on this draft permit.
1

North Carolina } ss
Mecklenburg County}
The CharLotte Observer Publishing Co.
CharLotte, NC
Affidavit of Publication
THE CHARLOTTE OBSERVER
DINA SPRINKLE
NCDENR/DWQ/POINT SOURCE BRANCH
1617 MAIL SERVICE CENTER
RALEIGH NC 27699
REFERENCE: 30063432
6366782 wastewater permit
Before the undersigned, a Notary Public of said
County and State, duly authorized to administer
oaths affirmations, etc., personally appeared,
being dulysworn or affirmed according to law,
doth depose and say that he/she is a
representative of The Charlotte Observer
Publishing Company, a corporation organized and
doing business under the Laws of the State of
Delaware, and publishing a newspaper known as The
Charlotte Observer in the city of Charlotte,
County of Mecklenburg, and State of North Carolina
and that as such he/she is familiar with the
books, records, files, and business of said
Corporation and by reference to the files of said
publication, the attached advertisement was
inserted. The following is correctly copied from
the books and files of the aforesaid Corporation
and Publication.
PUBLISHED ON: 07/19
AD SPACE: 64 LINE
FILED ON: p 07/24/09
NAME:
TITLE:
DATE:
�jllNi2009
Public Notice •
North Carolina Environmental Management
Commission/NPDES Unit
1617 Mail Service Center •
Raleigh, NC 27699.1617
Notice of Intent to Issue a NPDES Wastewater Permit
The North Carolina Environmental Management Commission
proposes to issue a NPDES wastewater discharge permit to the
person(s) listed below.
Written comments regarding the proposed permit will be
accepted until 30 days atter the publish date of this notice. The
Director of the NC Division of Water Qualily (DWQ) may hold a
public hearing should there be a significant degree of public
interest. Please mail comments and/or information requests, to
DWQ at the above address. Interested persons may visit the DWQ
at 512 N. Salisbury Street. Raleigh, NC to review information on
file. Additional information on NPOES permits and this notice may
he found on our website: www.ncwaterquality.org, or by calling
[phone].
The Radiator Specially Company requested a new permit
NC0088838 for Radiator Specially Company in Union County; this
facility discharge is treated groundwater to unnamed tributary to
South Fork Crooked Creek, Yadkin River Basin.
Union County requested renewal of permit NC0069841 for the
Crooked Creek WWTP #2 tacitly in Union County; this permitted
discharge,is treated municipal wastewater to North Fork Crooked
Creek, Yadkin -Pee Dee River Basin.
LP6366762
In Testimony Whereof i have hereunto set my hand and affixed my seal, the
day and year aforesaid.
Notary:
My Commission Expires May 17, 2011
My Commission Expires: _/_/_

NCDENR/ DWQ
FACT SHEET FOR NPDES PERMIT DEVELOPMENT
Crooked Creek WWTP #2
Union County
NC0069841
_
Facility InformationT`,i
Facility Name:
Crooked Creek WWTP #2/ Union County Public Works
Permitted Flow (MGD):
1.9
County:
Union
Facility Class:
III
Regional Office:
Mooresville
Pretreatment Program:
No
USGS Topo Quad:
G16SE
Permit Status:
Renewal
USGS Quad Name:
Bakers
Stream Characteristics
Receiving Stream:
North Fork Crooked
Creek
Drainage Area (mi2):
13.65
Sub -basin:
03-07-12
Summer 7Q10 (cfs):
0
Stream Index Number:
12-17-20-1a
Winter 7Q10 (cfs):
0.2 USGS memo
3-18-08
Stream Classification:
C 1
30Q2 (cfs):
0.4 USGS memo
3-18-08
303(d) Status:
I Listed
Average Flow (cfs):
13
305(b) Status:
I
N/a
IWC %:
100
Permit writer:
Julie Grzyb
Date:
June 25, 2009
1.0 Proposed Changes Incorporated into Permit Renewal
• Provisional tetrachloroethylene limit of 18 µg/L based on data from Priority Pollutant
Analyses. Tetrachloroethylene is known to cause cancer in humans and the limit is based on
a North Carolina Human Health standard.
• Add a requirement to monitor zinc on a monthly sampling frequency based on PPA data.
• Add a requirement to perform an annual Priority Pollutant Analyses since this facility is
considered a Major WWTP.
2.0 Background Information
The Crooked Creek WWTP #2 is owned and operated by Union County Department of
Public Works. The facility maintains one outfall (001) with effluent generated from 100%
domestic wastewater. At one point the Crooked Creek WWTP #2 had a full pretreatment
program and two SIUs, however both industries have gone out of business. The pretreatment
program has been inactive since 1998.
North Fork Crooked Creek is 303(d) listed according to the 2006 and 2008
Impaired Waters list. The stream showed impairment due to biological data in 1998, impairment
due to turbidity in 2004, and both biological and turbidity impairment in 2008. Potential sources
are urban runoff and storm sewers. The 2003 Yadkin -Pee Dee Basin Plan notes that problems
with low dissolved oxygen in North Fork Crooked Creek were thought to be contributing to
impairment in 1998. Aquatic life and secondary recreation continue to be impaired in the stream.

NPDES Permit Fact Sheet — 07/ 13/09 Crooked Creek WWTP #2
Page 2 NC0069841
As a member of the Yadkin -Pee Dee River Basin Association the plant personnel monitor
two stations near the Crooked Creek WWTP #2: Station Q8386000 is approximately 1.5 miles
upstream at SR 1520 and Station Q8386200 is approximately 1 mile downstream at SR 1514.
Upstream and downstream station sampling, performed by the facility from 2005 through 2008,
continue to show low dissolved oxygen in North Fork Crooked Creek with levels below North
Carolina's water quality standard of 5.0 mg/L during warmer months (see D.O. chart attached).
The data also shows, DO levels are generally lower upstream than downstream, however, it is
not clear exactly where the DO sag for this facility occurs downstream of the discharge.
On January 23, 2008 Hazen & Sawyer sent a letter on behalf of Union County requesting
speculative effluent limits for a potential expansion at the Crooked Creek WWTP. The Division
responded on May 7, 2008 unable to provide Crooked Creek with speculative limits since the
model proved to be an inappropriate tool because it was unable to reflect the actual conditions
(low dissolved oxygen) in the existing stream. The Division was also not able to provide
speculative limits for a discharge to South Forth Crooked Creek because new discharges are not
permitted to streams having a zero, summer 7Q10, and 30Q2. It was suggested that the County
explore any and all alternatives other than a NPDES discharge due to the limited stream flow and
low dissolved oxygen levels in the local streams.
The provisional limit on selenium, originally put in the permit issued in 2005, was removed in a
modified permit issued on January 16, 2007 after sufficient data was collected to demonstrate that
selenium was not a pollutant of concern in the plant's effluent.
3.0 Compliance Summary
DMR Data Review
Average flows at The Crooked Creek WWTP #2 show the plant to be at approximately 66%
capacity with peak flows exceeding capacity around 5% of the time during the years 2006
through 2008. With the exception of BOD and NH3-N, the facility appears to be operating
within its permitted limits. A summary of effluent data for the years, 2006 through 2008, is
presented in Table 1, below.
Table 1: Average Monthly DMR Data Summary; 2006-2008
L^{ . ; '
Flow'
(M[cn)f
ii + 'ryii
`Temp:
'(deg
? TT .'�j.•
Residual
,Ctiloune
' . (i gam) =
.... +",
: Y
y BOD
:(m ) .::.'(mom):.
' i
:
NH3-N
i -�rrA•
TSS
(mom)
i- i.s'� 't
.i-
Fecal
-(# 00 )
ML{�.— `"tc---+ash
SD.O.'`
` ( WL) _
� {
;y
TN` �A
(mt)>
r
i
rn TP
s'(m )
Avg
1.26
19.2
waiver
4.05
0.22
5.7
69
9.1
28.4
3.83
Max
2.64
29.8
30.07
21
73
1520
15.1
55.21
6.92
Min
0.23
8.9
Waiver
2
<1
<2
<1
6
5.2
0.49
Limit
1.9
17
5; 7.5 (s)
10; 15 (w)
2 ; 6 (s)
4; 12 (w)
30.0;
45.0
200; 400
> 6.0
Monthly average; weekly average
RPA Analysis
An RPA was conducted for copper. The highest reported value over the last three years was 21.3
µg/L. The stream standard is 7 µg/L, however, this is an Action Level standard and should be
reviewed in conjunction with toxicity testing. It is recommended that monitoring for copper
remain in the NPDES permit with a monthly sampling frequency.
An RPA was performed on tetrachloroethylene but the data was limited having results from only
three samples. Tetrachloroethylene is discussed later under PPA data.

NPDES Permit Fact Sheet - 07/ 13/09 Crooked Creek WWTP #2
Page 3 NC0069841
WET Test Results
Crooked Creek WWTP #2 has failed 4 of the 17 WET tests conducted since January 2005. Toxicity
test failures occurred in Aug. 2008, April 2008, Feb. 2007, and June 2005. Each time a Notice of
Violation was issued and the facility was notified that a Toxicity Identification Evaluation (TIE)
would have to be pursued if two or more WET permit limit violations occurred during a calendar
quarter. To date, the facility has not had to pursue a TIE.
Correspondence File Review/Compliance History
Crooked Creek WWTP #2 had three weekly average and 3 monthly average BOD violations from
January 2006 through December 2008. During that time, the facility had one month where the
ammonia nitrogen exceeded its weekly and monthly average (October 2008). No reasons were
determined or cited for the violations. In addition, the facility received two NOV's for its failure
to collect flow proportional influent composite samples found during inspections performed on
Aug. 5, 2008 and Feb. 15, 2007. Union County was fined a total of $2,666.50 for these violations
(See Compliance Record attached). Regional personnel inspected the facility on August 28, 2008
and noted that the WWTP was in good operational condition and no problems were found
during the investigation. The Regional report recommended that the permit be renewed as
requested.
PPA data
The facility submitted 3 Priority Pollutant Analyses as required by the permit application. There
was one significant hit for Tetrachloroethylene at a concentration of 297 µg/L on 5/30/08. The
other two results were reported at 5.2 µg/L and < 5 µg/L. The facility will collect 12 consecutive
monthly samples in order to determine whether tetrachloroethylene is a parameter of concern. A
provisional limit will be placed in the permit taking effect 18 months after the effective date of the
final permit. If the 12 months of samples are all below the detection level, the facility may
request to have the limit removed from the permit.
The 3 Priority Pollutant Analyses also showed zinc as a parameter of concern. Test results were:
55.7 µg/L on 5/30/08, 62.5 µg/L on 4/29/08 and 72 µg/L on 7/2/04. The NC Action Level .
Standards for zinc are 50 µg/L chronic and 67 µg/L acute. There was not enough data to
perform an RPA but the results do show that given an instream waste concentration of 100%, zinc
exceeded the chronic action level standard on three occasions and the acute standard on one
occasion. It is recommended that zinc be monitored monthly.
4.0 Proposed Schedule for Permit Issuance
Draft Permit to Public Notice: 7/ 15/ 09 (estimate)
Permit Scheduled to Issue: 9/ 07/ 09 (estimate)
5.0 State Contact Information
If you have any questions on any of the above information or on the attached permit,
please contact Julie Grzyb at [phone].
Copies of the following are attached to provide further information on the permit development
• Draft permit • Copper RPA
• Dissolved oxygen chart • Compliance Record

NPDES Permit Fact Sheet — 07/ 13/09
Page 4
Crooked Creek WWTP #2
NC0069841
NPDES Recommendation by:
Signature Date
Regional Office Comments:
Regional Recommendation by:
Signature Date
Reviewed and accepted by:
Regional Supervisor:
Signature
Date
NPDES Unit Supervisor:
Signature
Date

DO Chart -Upstream (Q8386000) Downstream (Q8386200) Stations
Upstream Downstream NC WQS
Date
Temp. (°C)
DO (mg/L)
DO (mg/L)
DO (mg/L)
1/26/2005
2/16/2005
3/16/2005
4/13/2005
5/11/2005
5/24/2005
6/21/2005
9.00
9.10
9.00
5.00
12.00
7.80
7.90
5.00
7.60
8.70
8.90
5.00
12.50
7.10
7.00
5.00
19.40
6.30
6.10
5.00
22.80
5.10
5.20
5.00
20.70
5.90
5.80
5.00
6/28/2005
i 7/13/2005
i 7/26/2005
8/17/2005
8/30/2005
9/6/2005
9/21/2005
10/19/2005
11/16/2005
12/14/2005
23.70
5.30
5.40
5.00
22.90
5.40
5.30
5.00
29.60
4.50
4.70
5.00
27.20
4.60
4.50
5.00
26.80
4.60
4.80
5.00
24.20
4.60
4.30
5.00
23.40
4.60
4.70
5.00
21.90
4.70
4.90
5.00
17.10
4.30
4.50
5.00
7.30
7.20
7.10
5.00
1/25/2006
2/22/2006
3/15/2006
4/12/2006
5/10/2006
5/23/2006
6/14/2006
6/27/2006
7/19/2006
7/25/2006
8/16/2006
8/29/2006
9/13/2006
9/26/2006
10/18/2006
11/15/2006
12/13/2006
1/24/2007
2/14/2007
3/14/2007
4/18/2007
5/9/2007:
5/22/2007
7.50
8.00
8.10
5.00
6.80
7.50
7.70
5.00
15.30
8.00
8.30
5.00
17.90
8.20
8.60
5.00
16.80
7.80
8.20
5.00
21.40
6.80
6.60
5.00
22.60
5.20
5.40
5.00
24.30
5.20
5.30
5.00
28.10
4.60
5.10
5.00
24.90
5.40
5.50
5.00
25.50
5.20
5.40
5.00
27.60
4.90
4.50
5.00
22.10
5.60
6.00
5.00
19.90
4.40
6.30
5.00
17.10
5.60
6.50
5.00
16.60
6.20
6.70
5.00
12.50
7.70
8.10
5.00
8.30
9.60
10.40
5.00
7.70
9.20
9.50
5.00
12.40
8.00
8.20
5.00
14.20
7.80
7.90
5.00
16.70
7.30
7.50
5.00
24.20
5.50
5.60
5.00
6/13/2007
6/26/2007
7/11/2007
7/24/2007
8/15/2007
8/28/2007:
9/12/2007
9/25/2007
10/10/2007
11/14/2007
12/12/2007
1/16/2008
2/20/2008
3/12/2008
4/23/2008
5/7/2008
22.40
5.80
6.00
5.00
26.30
5.10
5.30
5.00
25.60
4.30
4.90
5.00
26.50
5.30
5.50
5.00
28.60
4.40
4.90
5.00
27.30
4.80
5.10
5.00
23.70
5.50
5.80
5.00
23.40
5.10
5.20
5.00
24.50
5.10
5.30
5.00
12.00
7.20
7.50
5.00
12.70
6.90
7.30
5.00
6.40
9.10
9.80
5.00
11.40
8.70
8.90
5.00
12.30
6.70
7.00
5.00
17.50
6.20
6.60
5.00
19.70
6.00
6.30
5.00

5/20/2008
6/11/2008
6/24/2008
7/16/2008
7/29/2008
8/13/2008
8/26/2008
9/10/2008
9/23/2008
10/8/2008
11/12/2008
12/10/2008
21.50
5.40
5.80
5.00
27.60
4.10
4.80
5.00
26.70
3.90
4.80
5.00
27.40
4.00
4.80
5.00
27.20
3.40
4.30
5.00
23.40
4.20
5.00
5.00
24.50
4.40
4.70
5.00
23.70
4.40
5.10
5.00
22.10
4.20
4.80
5.00
18.90
5.40
5.90
5.00
13.40
6.40
6.80
5.00
8.20
8.50
' 8.90
5.00

REASONABLE POTENTIAL ANALYSIS
Crooked Creek WWTP #2
NC0069841
Time Period
Qw (MGD)
7Q 10S (cfs)
7Q10W (cfs)
30Q2 (cfs)
Avg. Stream Flow, QA (cfs)
0
1.9
0
0.2
0.4
13
Rec'ving Stream North Fork Crooked Creek
WWTP Class III
IWC (%) Q 7Q1OS 100
7Q 10W 93.641
@ 3002 88.042
C�?QA 18.47
Stream Class C
Outfall 001
Qw = 1.9 MGD
PARAMETER
TYPE
(1)
STANDARDS &
CRITERIA (2)
POL
Units
REASONABLE POTENTIAL RESULTS
RECOMMENDED ACTION
NC WQS/ 1/2 FAV /
Chronic Acute
n # Det. Max Pred Cw Allowable Cw
Tetrachloroethylene
C
3.3
ug/L
3 2
Note: n<12
Limited data
10804.9
set
Acute: N/A
_ _ _ _ _ _ _ _
Chronic: 18
North Carolina Human Health Standard 3.3 ug/L
_Recommend monthly monitoring, after 12 months permittee
can request parameter be removed from permit if ND,
otherwise, the provisional limit of 18 ug/L will take effect.
Copper
NC
7 AL 7.3
ug/L
28 22
41.3
Acute: 7
_ _ _ _ _ _ _
Chronic: 7
_Reasonable potential to exceed stds _ _ _ _ _ _ _ _ _
No limit as this is an action level parameter
Maintain monitoring.
* Legend:
C = Carcinogenic
NC = Non -carcinogenic
A = Aesthetic
" Freshwater Discharge
Msg00
Msg01
Msg02
< No Data Entered >
MaxPredCw < Acute
• MaxPredCw < Chronic
KrilLitbrs - -•i -rrll•1l11.•
MaxPredCw > Acute
MaxPredCw > Chronic
tAsg07Max?(�edCw >? Acute ` '
!v.Sgl r«p t? xgaciy11S`:.0 pniC z ir..,
Msg09 No acute standard or 1/2 FAV
Msg10 No chronic standard or criterion
Msg05
Msg06
Sample recommendations:
Daily max limit
Monitor 1/month
Monitor 1/week
Monitor 2/month
Monitoring not necessary in permit
No limit
No limit - assuming no tox (Action Level parameter)
No limit (Action Level parameter)
Continue to monitor at 2/month
Mo. avg. limit (keep wk. avg. if existing)
Revise daily max. limit
Crooked Creek RPA 2009.xls, rpa
7/13/2009

Compliance Record on Crooked Creek WWTP #2 NPDES NC0069841 (2006-2009)
Operated by: Union County Public Works Department (UCPWD)
Reclaimed water permit WQ0032520 for 0.25 MGD
Toxicity test failures:
Aug. 2008 (NOV issued 10-27-2008),
April 2008 (NOV issued 6-24-2008),
Feb. 2007 (NOV issued 5-3-2007).
NOV issued 2-20-2009 for October 2008 self -monitoring report
Wkly. avg. 9/28 —10/4/08 NH3-N violation 18.9 mg/L
Mo. avg. 10/08 NH3-N violation 3.2 mg/L
No specific cause was determined.
NOV issued 1-15-2008 for June 2007 self -monitoring report
Mo. avg. BODS violation at 5.4 mg/L
No reason given for the violation.
NOV issued 2-1-2008 for Aug. 2007 self -monitoring report
Wily. avg. ' BODS violation at 9.4 mg/L
No reason given for the violation.
(limit 6 mg/L summer)
(limit 2.0mg/L summer)
(limit 5 mg/L summer)
(limit 7.5 mg/L summer)
NOV issued 1-28-2008 for July 2007 self -monitoring report
Wily. avg. BODS violation at 8.5 mg/L (limit 7.5 mg/L summer)
No reason given for the violation.
NOV issued 1-7-2008 for May 2007 self -monitoring report
Monthly. avg. BODS violation at 5.24 mg/L (limit 5.0 mg/L summer)
No reason given for the violation.
NOV issued Aug. 21, 2008 for inspection performed on Aug. 5, 2008
Inspection violation — failure to collect flow proportional influent composite samples
this was also cited at the previous inspection on 2-20-07
NOV issued 7-6-2007 for Feb. 2007 self -monitoring report
Monthly. Avg. . BOD5 violation at 10.7 mg/L(limit 10.0 mg/L winter)
No reason given for the violation.
NOV issued Feb. 20, 2007 for inspection performed on Feb. 15, 2007
Inspection violation — failure to collect flow proportional influent composite samples
NOV issued 2-20-2007 for March 2006 self -monitoring report
Wkly. avg. 3/26 — 4-1-06 BOD5 violation at 7.8 mg/L (limit 7.5 mg/L summer)
No reason given for the violation.
Case Number
LV-2009-0055 Monitoring report has Limit Violations 2-20-2009 $2,085.30
Penalty Assessed and Paid
Case Closed
03/16/2009
LV-2008-0054 Monitoring report has Limit Violations 2-01-2008 $ 581.20 03/10/2008
Total: $2,666.50

IWC Calculations
Facility: Crooked Creek WWTP #2
NC0069841
Prepared By: Julie Grzyb
Enter Design Flow (MGD): 1.9
Enter s7Q10 (cfs): 0
Enter w7Q10 (cfs): 0.2
Total Residual Chlorine (TRC)
Daily Maximum Limit (ug/l)
s7Q10 (CFS)
DESIGN FLOW (MGD)
DESIGN FLOW (CFS)
STREAM STD (UG/L)
Upstream Bkgd (ug/I)
IWC (%)
Allowable Conc. (ug/l)
Fecal Coliform
Monthly Average Limit:
(If DF >331; Monitor)
(If DF<331; Limit)
Dilution Factor (DF)
0
1.9
2.945
17.0
0
100.00
17
Ammonia (Summer)
Monthly Average Limit (mg NH3-N/I)
s7Q10 (CFS)
DESIGN FLOW (MGD)
DESIGN FLOW (CFS)
STREAM STD (MG/L)
Upstream Bkgd (mg/I)
IWC (%)
Allowable Conc. (mg/I)
Ammonia (Winter)
Monthly Average Limit (mg NH3-N/I)
w7Q10 (CFS)
2001100m1 DESIGN FLOW (MGD)
DESIGN FLOW (CFS)
STREAM STD (MG/L)
1.00 Upstream Bkgd (mg/I)
IWC (%)
Allowable Conc. (mg/I)
Total Residual Chlorine
1. Cap Daily Max limit at 28 ug/I to protect for acute toxicity
Ammonia (as NH3-N)
1. If Allowable Conc > 35 mg/I, Monitor Only
2. Monthly Avg limit x 3 = Weekly Avg limit (Municipals); capped at 35 mg/I
3. Monthly Avg limit x 5 = Daily Max limit (Non-Munis); capped at 35 mg/I
4. BAT for Minor Domestics: 2 mg/I (summer) and 4 mg/I (winter)
5. BAT for Major Municipals: 1 mg/I (year-round)
0
1.9
2.945
1.0
0.22
100.00
1.0
0.2
1.9
2.945
1.8
0.22
93.64
1.9
Fecal Coliform
1. Monthly Avg limit x 2 = 400/100 ml = Weekly Avg limit (Municipals) = Daily Max limit (Non -Muni)
NPDES Server/Current Versions/WLA; TB 1/16/2009

NC0069175
NC0069175
NC0069175
NC0069175
NC0069175
NC0069175
NC0069175
NC0069175
NC0069175
NC0069175
NC0069175
NC0069175
NC0069175
NC0069175
NC0069175
NC0069175
NC0069175
NC0069175
NC0069175
NC0069175
NC0069175
NC0069175
NC0069175
NC0069175
NC0069523
NC0069523
NC0069523
NC0069523
NC0069612
NC0069612
NC0069612
NC0069612
NC0069612
NC0069612
NC0069671
NC0069957
NC0069965
NC0069965
NC0069965
NC0069965
NC0069965
N C0069965
NC0069965
NC0069965
NC0069965
NC0069965
NC0069965
NC0069965
NC0069965
NC0070084
NC0070084
NC0070084
0 LV-2005-04. 11/17/2005
0 LV-2005-04' 12/13/2005
0 LV-2006-00i 3/1/2006
0 LV-2006-03: 9/13/2006
0 LV-2006-03' 10/3/2006
0 LV-2006-04 11/9/2006
0 LR-2007-00 6/25/2007
0 LM-2008-00 1/31/2008
0 LV-2008-00i 2/6/2008
0 LM-2008-00 2/12/2008
0 LV-2008-00! 3/12/2008
0 LV-2008-01: 4/28/2008
0 LV-2008-01 f 5/6/2008
0 LV-2008-01! 6/2/2008
0 LV-2008-01! 6/2/2008
0 LM-2008-00 8/14/2008
0 LM-2008-00 9/8/2008
0 LM-2008-00 10/14/2008
0 LM-2008-00 11/6/2008
0 LM-2008-00 12/10/2008
0 LM-2009-00 1/29/2009
0 LV-2009 b.p: 2/19/2009
0 LM-2009-00\/27/2009
0 LM-2009-00 4/8/2009
0 LV-2005-04 10/1�9/20
0 LV-2005-04: 11 /30/2 05
0 LV-2006-001 1/11/2 066
0 LV-2006-02 7/5/2/ 06
0 LV-2005-02, 7/18/2005
0 SP-2005-00 9/28/2005
0 LV-2006-03, 9/5/2006
0 LV-2008-01: 4/14/2007
0 LV-2008-02' 7/7/2008
0 LV-2009-00' 3/11/2009
0 LV-2006-01; 7/6/2006
0 LV-2004-01! 6/14/2004
0 LV-2004-00i 1/14/2004
0 LV-2004-02: 6/16/2004
0 LV-2004-02, 6/18/2004
0 LV-2004-04; 9/27/2004
0 LV-2004-04; 9/27/2004
0 LV-2004-02: 12/1/2004
0 LV-2005-00! 3/4/2005
0 LV-2005-02! 8/25/2005
0 LV-2005-03. 9/14/2005
0 LV-2005-03, 9/14/2005
0 LV-2007-04i 11/7/2007
0 LV-2007-04 11/9/2007
0 LV-2008-02: 7/25/2008
0 LV-2004-05 10/20/2004
0 LV-2005-00. 1/19/2005
0 LV-2005-01: 3/22/2005
$435.04 Ridge Comr Ridge Comr
$397.54 Ridge Comr Ridge Comr
$328.95 Ridge Comr Ridge Comr
$1,025.15 Ridge Comr Ridge Comr
$417.65 Ridge Comr Ridge Comr
$552.65 Ridge Comr Ridge Comr
$1,100.00 Ridge Comr Ridge Comr
$433.89 Ridge Comr Ridge Comr
$881.20 Ridge/Comr Ridge Comr
$1,258.89 RidComr Ridge Comr
$381.20 Rie Comr Ridge Comr
$181.20 5 dge Comr Ridge Comr
$283.89 idge Comr Ridge Comr
$283.8 Ridge Comr Ridge Comr
$283. 9 Ridge Comr Ridge Comr
$28 .20 Ridge Comr Ridge Comr
$2• S.40 Ridge Comr Ridge Comr
$ 3.64 Ridge Comr Ridge Comr
85.30 Ridge Comr Ridge Comr
385.30 Ridge Comr Ridge Comr
$183.64 Ridge Comr Ridge Comr
$283.64 Ridge Comr Ridge Comr
$483.64 Ridge Comr Ridge Comr
$483.64 Ridge Comr Ridge Comr
$535.04 Union Coun Tallwood Es
$185.04 Union Coun Tallwood Es
$185.04 Union Coun Tallwood Es
$630.15 Union Coun Tallwood Es
$308.28 Town of Ro\ Rowland WI
$5, 71.31 Town of RE A Rowland WI
$3 62 Town of Roy Rowland '
$365�W
, Town of Roy Rowland WI
$615.17 own of Ro\ Rowland WI
$385.17 To n of Ro\ Rowland WI Robeson
$350.00 J M \\uiidE Mills River ' Henderson
$300.00 Laurelw0 d Laurelwood Buncombe
$350.00 Larry G Sc cotty's Mot McDowell
$350.00 Larry G Sco S tty's Mot McDowell
$200.00 Larry G Sco Sco t s Mot McDowell
$537.50 Larry G Sco Scotty's�(vlot McDowell
$225.00 Larry G Sco Scotty's '^ McDowell
$450.00 Larry G Sco Scotty's Mot McDowell
$200.00 Larry G Sco Scotty's Mot McDowell
$662.50 Larry G Sco Scotty's Mot McDowell
$225.00 Larry G Sco Scotty's Mot McDowell
$662.50 Larry G Sco Scotty's Mot McDowell
$420.00 Larry G Sco Scotty's Mot McDowell
$170.00 Larry G Sco Scotty's Mot McDowell
$320.00 Larry G Sco Scotty's Mot McDowell
$513.36 City of New Stately Pine Craven
$313.76 City of New Stately Pine Craven
$163.76 City of New Stately Pine Craven
Gaston
Gaston
Gaston
Gaston
Gaston
Gaston
Gaston
Gaston
Gaston
Gaston
Gaston
Gaston
Gaston
Gaston
Gaston
Gaston
Gaston
Gaston
Gaston
Gaston
Gaston
Gaston
Gaston
Gaston
Union
Union
Union
Union
Robeson
Robeson
Robeson
Robeson
Robeson
Gastonia
Gastonia
Gastonia
Gastonia
Gastonia
Gastonia
Gastonia
Gastonia
Gastonia
Gastonia
Gastonia
Gastonia
Gastonia
Gastonia
Gastonia
Gastonia
Gastonia
Gastonia
Gastonia
Gastonia
Gastonia
Gastonia
Gastonia
Gastonia
Indian Trail
Indian Trail
Indian Trail
Indian Trail
Rowland
Rowland
Rowland
Rowland
Rowland
Rowland
Horse Shoe
Candler
Marion
Marion
Marion
Marion
Marion
Marion
Marion
Marion
Marion
Marion
Marion
Marion
Marion
New Bern
New Bern
New Bern

Grzyb, Julie
From: Patt, Heather
Sent: Friday, July 17, 2009 11:53 AM
To: Grzyb, Julie
Subject: RE: DO levels in North Fork Crooked Creek
HI Julie, Thanks for this info. Yes, we use the association data for use support decisions, unfortunately the 2008 303(d)
list is still draft and is based on the 5 year data window from 02-06. 2004-08 data will be used for the 2010 303(d)list
which should be coming out sometime soon, granted how long it takes EPA to approve it is another story. The DO for
these sites looks okay based on the std of not less than 4mg/L instantaneous values, the 5mg/L is for sites that take a
daily average. Page 21 of the redbook has the info, although I've been confused myself b/c the instantaneous std is not
listed in the chart in the back of the redbook. I'm more concerned about the upstream fecal #s, ugh, those slugs of
organic wastes could be pulling DO levels down., although this isn't the WWTPs fault.
Let me know if you have any more questions or come across something that is curious???
Thanks, Heather
From: Grzyb, Julie
Sent: Friday, July 17, 2009 10:44 AM
To: Patt, Heather
Subject: DO levels in North Fork Crooked Creek
Heather,
I just finished working on the draft permit for Crooked Creek WWTP #2 in YPDRB and I thought you might be
interested in the attached DO chart. I am sure you are aware of this as DO continues to be a significant problem in this
area. They discharge to North Forth Crooked Creek and like some of the other streams in the area the DO is often lower
upstream of the outfall than downstream, however, its likely the true DO sag from the WWTP is further downstream —
can not really model it well since this stream has a zero S7Q10.
Anyway, these numbers are from the YPDRB association data for which the plant samples 1.5 miles upstream
(Q8386000) and a mile downstream (Q8386200). Out of 136 samples, greater than 27 % were below the std. of 5 so I
am surprised the stream is not impaired for DO. Does the agency ever use Association data to assess impairment? I am
relatively new and still trying to figure all this out. If you can call or write and shed some light on this for me I would
appreciate it.
Thanks,
Julie
Julie A. Grzyb, Environmental Engineer
NC DENR / Division of Water Quality / Surface Water Protection Section
NPDES West, Point Source Branch
1617 Mail Service Center, Raleigh, NC 27699-1617
919/807-6389 (wk); 919/807-6495 (fax)
**Please note, my email address has changed to julie.grzvb(a,ncdenr.gov
E-mail correspondence to and from this address may be subject to the North Carolina Public Records law and may be
disclosed to third parties.
1

The hearing officer will accept written comments until October 8, 2004.
Send comments to:
Jimmie Overton
c/o Michael E. Templeton, P.E.
North Carolina Division of Water Quality
Point Source Branch
1617 Mail Service Center, Raleigh, NC 27699

SOC Priority Project: No
To: Western NPDES Program Unit
Water Quality Section
Attention: Dina Sprinke
Date: August 29, 2008
NPDES STAFF REPORT AND RECOMMENDATION
County: Union
Permit No. NC0069841
SEP
PART I - GENERAL INFORMATION
1. Facility and Address: Crooked Creek WWTP #2
Union County Public Works Dept.
500 North Main Street
Monroe, North Carolina 2811-4730
2. Date of Investigation: August 28, 2008
3. Report Prepared by: Samar Bou-Ghazale, Env. Engineer II
4. Persons Contacted and Telephone Number: Mr. Robert Smith, ORC, Mr. John Hahn, Supervisor;
[phone].
5. Directions to Site: From the intersection of US Hwy 74 and SR 1515 (Sardis Church Road),
travel north on SR 1515 approximately 0.5 mile. The WWTP entrance road is located on the left
side of the road, just before crossing South Fork Crooked Creek.
6. Discharge Point(s), List for all discharge points:
Latitude: 35° 05' 47" Longitude: 80° 35' 53"
Attach a USGS map extract and indicate treatment facility site and discharge point on map.
U.S.G.S. Quad No.: G16SE U.S.G.S. Quad Name: Bakers
7. Site size and expansion area consistent with application? Yes.
8. Topography (relationship to flood plain included): Topography is flat ; the WWTP appears to be
located just above the 100 year flood plain.
9. Location of nearest dwelling: None within 1000 feet.
10. Receiving stream or affected surface waters: North Fork Crooked Creek.
I

Page Two
a. Classification: C
b. River Basin and Subbasin No.: Yadkin 030714
c. Describe receiving stream features and pertinent downstream uses: Receiving stream is
approximately 18-20 feet wide x 6-12 inches deep with sandy/muddy bottom and very
slow water velocity. General "C" classification uses downstream (rural/agriculture).
PART II - DESCRIPTION OF DISCHARGE AND TREATMENT WORKS
1. a. Volume of wastewater to be permitted: 1.9 MGD (ultimate design capacity)
b. Current permitted capacity of the wastewater treatment facility: 1.9 MGD
c. Actual treatment capacity of the current facility (current design capacity): 1.9 MGD
d. Date(s) and construction activities allowed by previous Authorizations to Construct issued
in the previous two years: N/A
e. Please provide a description of existing or substantially constructed wastewater treatment
facilities: The existing WWT facilities consist of 6 influent pumps with stand-by power
generator, one steps screen mechanical and one manual bar screen, dual oxidation ditches
with six (6) aerators, four secondary clarifiers, six (6) high rate tertiary filters, Ultra -violet
disinfection, two (2) back-up chlorine contact basins, back-up dechlorination, cascade
post aeration, four (4) aerobic (mechanical) sludge digesters, one (1) sludge holding tank,
three (3) inactive sludge drying beds, lime and polymer addition, three effluent pump
stations, and a stand-by power generator.
f. Please provide a description of proposed wastewater treatment facilities: N/A
g•
Possible toxic impacts to surface waters: N/A
h. Pretreatment Program (POTWs only): Approved. The pretreatment program is inactive at
this time since no significant industrial users are discharging to the WWTP.
2. Residuals handling and utilization/disposal scheme:
a. Residuals are land applied. DWQ Permit No. WQ0007486.
Residuals Contractor: EMA
Telephone No.: [phone].
b. Residuals stabilization: PSRP (Class B)
3. Treatment plant classification: Class III
4. SIC Code(s): 4952 Wastewater Code(s) 01
Main Treatment Unit Code: 10103

• Page Three
PART III- OTHER PERTINENT INFORMATION
1. Is this facility being constructed with Construction Grant Funds or are any public monies involved
(municipals only)? Public monies were used in the expansion of this facility.
2. Special monitoring or limitations (including toxicity) requests: None at this time.
3. Important SOC, JOC or Compliance Schedule dates (Please indicate): N/A
4. Alternative Analysis Evaluation: N/A
5. Air quality and/or groundwater concerns or hazardous materials utilized at this facility that may
impact water quality, air quality, or groundwater: No AQ or GW concerns nor are hazardous
materials utilized at this facility with the exception of chlorine.
PART IV - EVALUATION AND RECOMMENDATIONS
The Union County Public Works Department (UCPWD) has applied for permit renewal for the
subject facility. The WWTP appeared in good operational condition at the time of the inspection. No
problems were noted during the investigation. No impact was observed on the receiving stream. Also, it
should be noted that this facility has a 0.25 MGD reuse permit.
Pending review and approval by the Western NPDES Program Unit, it is recommended that
the permit be renewed as requested.
Signature of repo parer Date
/5' IL-- 7/yoi/
Water Quality Regional Supervisor Date
SEP

UNION COUNTY PUBLIC WORKS
July 30, 2008
Mrs. Dina Sprinkle
NC DENR / DWQ / Point Source Branch
1617 Mail Service Center
Raleigh, NC 27699-1617
Subject: NPDES Permit NC0069841
Renewal Package
Crooked Creek WWTP #2
Union County
Dear Mrs. Sprinkle:
AUG 5 2008
- Yi'TER G:JALITY
i
L.1! )I
The purpose of this letter is to request the renewal of the above referenced NPDES permit for
the Crooked Creek Wastewater Treatment Plant (WWTP) #2. The following items are included
in this renewal package:
■ One signed original and two copies of the cover letter
• One signed original and two copies of the completed application form, signed by the
permittee (includes map showing the location of the outfall)
• One signed original and two copies of a narrative description of the sludge management plan
for the facility
Since August 2004, a UV (ultraviolet light) disinfection system has been adapted at the Crooked
Creek WWTP #2 to accomplish disinfection. All other treatment procedures remain the same as
prior to the last permit renewal (August 2003).
Please contact me at [phone] if you have any questions or need additional information.
Sinc y,
ark
Assistant Director
cc: John Hahn
—off hen _ �vr��-�-etc"' w�TP
J ae(c ee ,
7 'i
500 North Main St., Suite 500 • Monroe, NC 28112-4730 • Phone: [phone] • Fax: [phone]

Union County Crooked Creek WWTP #2 ; •
L [I; •
AUG i.s
NC0069841 5 2002
B3 - Process Narrative — -
t
DERR . v ;rER C ;,iurr
The Crooked Creek WWTP is located at 4015 Sardis Church Road, Monroe,
North Carolina. The facility has a current hydraulic capacity of 1.9 MGD and is
composed of the following components:
• Influent pump station with six (6) submersible pumps, control panel and
stand-by generator with automatic transfer switch.
• Influent screening structure consisting of flow -measurement, automatic and
manual bar screens.
• A pair of oxidation ditches with a total of six (6) brush aerators.
• Four (4) secondary clarifiers.
• Six (6) tertiary sand filters.
• UV disinfection system.
• Two (2) chlorine contact chambers with flow measurement (optional).
• De -chlorination vault (optional).
• Cascade aeration. Although two (2) Cascade Aerators are on site, only one
(1) is in use at a time dependent upon usage of UV or Chlorine disinfection
(UV channel related one 99+% of time).
• Tri-pump effluent pump station.
• Return Activated Sludge (RAS) station with control panel, flow
measurement and dual submersible pumps.
• Waste Activated Sludge (WAS) station with control panel, flow
measurement and dual submersible pumps.
• Five (5) digesters/holding tanks with 2.0 MG total capacity.
• Facility stand-by generator with automatic transfer switch.

UNION COUNTY PUBLIC WORKS
RESIDUALS MANAGEMENT PLAN
Crooked Creek WWTP #2
NPDES No. NC0069841
Union County, North Carolina
All residuals at the Crooked Creek facility will be aerobically digested. The residuals will be
considered stable and therefore suitable for land application when the following criteria are
met:
1. At least seven (7) residuals samples will be collected and analyzed for Fecal Coliform
each monitoring period. The geometric mean of the densities of these samples will be
calculated and will be Tess than 2,000,000 Colony Forming Units per gram of total dry
solids prior to application.
2. Vector Attraction Reduction will be met through one of the following options: a) volatile
solids reduction of 38% or greater b) biosolids injection or incorporation or c) biosolids
alkaline stabilization.
All residuals will be disposed of in accordance with Residual Land Application Permit No.
WQ0007486.
Respectfully Submitted,
7)10'4 7 G_
1a'si / /)/i& ,L
500 North Main St., Suite 500 • Monroe, NC 28112-4730 • Phone: [phone] • Fax: [phone]

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