NC0074268_Permit Issuance_20020531

Tate of North Carolina
N
Department of Environment
and Natural Resources
Division of Water Quality
Michael F. Easley, Governor
William G. Ross, Jr., Secretary
Gregory J. Thorpe, Ph.D., Acting Director
- May 31, 2002
Mr. David Shellenbarger
City of Gastonia
P.O. Bog 1748
Gastonia, North Carolina 28053-1748
NORTH CAROLINA DEPARTMENT OF
ENVIRONMENT AND NATURAL RESOURCES
Subject: Issuance of NPDES Permit NC0074268
Crowders Creek WWTP
Gaston County
Dear Mr. Shellenbarger.
Division of Water Quality (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 May 9, 1994 (or as subsequently
amended).
The following changes have been made to the draft version of this permit:
• The sample type for silver, copper, zinc and mercury has been changed to composite. This is in accordance
with Division policy and matches your current permit requirements.
• The sampling frequency for toluene has been changed to quarterly. Toluene has not been detected in your
facility's effluent in the last three years. To ensure that levels of toluene in your effluent do not exceed North
Carolina water quality standards, reduced monitoring on a quarterly basis will now be required.
• A special footnote regarding ammonia has been included in the permit's effluent limits page. The
Environmental Protection Agency (EPA), which oversees North Carolina's NPDES program, has determined that
municipal permits in this state should include weekly average ammonia limits. Once an appropriate allowable
ammonia concentration has been established, the EPA will analyze ammonia data to assess reasonable potential to
exceed the allowable concentration. If reasonable potential to exceed the new limit exists, this permit will be re-
opened to include a weekly average ammonia limit
• Instream fecal coliform monitoring has been added to your permit. The Division is currently developing a
Total Maximum Daily Load (TMDL) for fecal coliform in the Crowders Creek watershed. Previous discussions
between Michelle Woolfolk of the TMDL Unit and members of your staff have emphasized the importance of
facility data collection to aid in the TMDL process. As such, instream monitoring during the summer months only
has been added to this permit. Please note that only one downstream sample (at the NCSR 2424 site) is required.
The Division offers the following in response to your comments submitted on August 16, 2001:
• Color Requirements: The Hearing Officer's report, submittedfor approval on February 8, 2002, states that the
effluent at the Crowders Creek facility was "extremely red...and appeared to constitute approximately 50% of the
flow of the receiving stream. The color of the receiving stream remained extremely red at the Forbes Road bridge
approximately one mile downstream." Moreover, the report states that although a Tier 3 color designation is
appropriate this permitting cycle, the Hearing Officer has recommended that the facility be placed at Tier 4 at the
next permit renewal unless "there is a significant improvement in the color of their effluent." An April 23, 2002 e-
mail from Larry Cummings of your staff states that one of the biggest industrial contributors to the color problem
has closed. This information was passed along to the Hearing Officer, who states that this will not cause the Tier 3
designation to change. Gastonia may, however, include mill closures as part of the required color reduction study.
1617 Mail Service Center, Raleigh, North Carolina 27699-1617 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer Visrr us ON THE INTERNET ® http /h2o.enr.state.nc.us/NPDES

Issuance of Permit NC0074268
Pag.P 2
• .
Please also note that there are facilities across the state with color requirements of some kind in their permits and
the specific color permitting strategy implemented this year will be used in upcoming pennit renewals.
Nutrient Requirements: The Division has proposed a year-round mass limit cap based on an equivalent
concentration limit of 6.0 mg/L total nitrogen in the summer and 12.0 mg/L total nitrogen in the winter (at
permitted flow). It is the Division's understanding that this is not an acceptable alternative to the City of Gastonia.
In order to protect water quality, the Division feels a summer concentration -based limit of 6A rng/L total nitrogen
is necessary.
• Silver, Copper and Zinc A reasonable potential analysis was conducted using effluent data provided by the City
of Gastonia. This analysis indicated reasonable potential to exceed North Carolina's action level standards for
silver, copper and zinc. Because of Gastonia's excellent toxicity record, no limits for these parameters were
imposed, but twice monthly monitoring will be required to ensure that the levels being discharged pose no threat to
water quality. This is consistent with toxicant requirements at Class IV facilities across the state.
• Daily maximum cyanide limit The strategy through which all facilities are permitted for toxicants requires that
no dilution be allowed for acute limits. One-half the FAV for cyanide is given as the acute limit for any facility
showing reasonable potential to exceed the state's water quality criteria for cyanide. It is anticipated that through
Gastonia's new laboratory techniques, such a limit will not pose a compliance problem for the Crowders Creek
facility.
Please also note a change in our permitting policy towards mercury, which continues to be a water quality
concern throughout North Carolina. NPDES permittees have worked with the state to reduce potential risks from
this pollutant, including tasks associated with collecting and reporting more accurate data. The most commonly used
laboratory analysis (EPA Method 245.1) has a detection limit of 0.21.ig/L while the current water quality standard is
an order of magnitude lower at 0.012 µg/L. A more recently approved analytical test (EPA Method 1631) should
produce a detection limit below the level of the standard. This will allow the Division to assess potential water quality
impacts from discharges more accurately. Therefore, beginning on or before September 1, 2003, you will be required
to begin using EPA Method 1631 when analyzing for mercury.
If any parts, measurement frequencies or samplingrequirements 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 demand is made, this decision shall be final and binding.
Please note that this permit is not transferable except after notice to the Division. The Division may require
modification or 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, the Coastal Area Management Act or any other Federal or Local governmental permit that may be
required
If you have any questions concerning this permit, please contact Natalie Sierra at telephone number (919)
733-5083, extension 551.
cc Central Files
Mooresville. Regional Office/Water Quality Section
NPDES Unit
Technical Assistance & Certification Unit
Aquatic Toxicology Unit
EPA Region 4
Ms. Donna Lisenby, Catawba Riverkeeper
Mr. Roy Bryant, Catawba River Foundation

Permit NC0074268
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
PERMIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE. ELIMINATION SYS'1'h',M
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, the
City of Gastonia
is hereby authorized to discharge wastewater from a facility located at the
Crowders Creek Wastewater Treatment Plant
off U.S. Highway 321 south of Gastonia
Gaston County
to receiving waters designated as Crowders Creek in the Catawba River Basin in accordance with effluent
limitations, monitoring requirements, and 'other conditions set forth in Parts I, II, III, and IV hereof.
The permit shall become effective July 1, 2002.
This permit and the authorization to discharge shall expire at midnight on August 31, 2005.
Signed this day May 31, 2002.
Grego e, Ph.D., ting Director
Division f W . er Quality
By Authority the Environmental Management Commission

r
•
Permit NC00'�4268
J ,
SUPPLEMENT TO PERMIT COVER SHEET
The City of Gastonia is hereby authorized to:
1. Continue to operate an existing 6.0 MGD wastewater treatment facility that includes
the following components:
••• Mechanical bar screen
••• Grit removal
••• Influent pump station
• Dual primary clarifiers
❖ Dual anoxic/oxic basins for biological phosphorus removal (includes anaerobic
basins with mechanical mixers and aerobic basins with diffused aeration)
:• Dual final clarifiers
❖ Two polishing/stabilization ponds
❖ Chlorine contact chamber (gas)
• SO2 dechlorination
••• Static post aerator
••• Dissolved air floatation (DAF) unit
••• Four anaerobic digesters
❖ Gravity sludge thickener
❖ Filter belt press dewatering unit
••• Alum and caustic addition •
This wastewater treatment facility is located at the Crowders Creek Wastewater
Treatment Plant off U.S. Highway 321 south of Gastonia in Gaston County.
2. Discharge wastewater from said treatment works at the location specified on the
attached map into Crowders Creek, classified C waters in the Catawba River Basin.

NC0074268 - Crowders Creek WWTP
Longitude:
Ouad #:
Stream Class:
Receiving Stream:
Permitted Flow:
35°10'10" Sub-B:
81°11'48"
G14NW/Gastonia South, NC
C
Crowders Creek
6.0 MGD
ids/ 16`i •'.!t
4
•
1A
lrr
City of Gastonia
Crowders Creek WWTP
NC0074268

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
from outfall 001. Such discharges shall be limited and monitored by the Permittee as specified below:
Permit NC0074268
•,
EFFLUENT
CHARACTERISTICS
LIMITS
MONITORING REQUIREMENTS
Monthly
Average
Weekly
Average
Daily
Maximum.
Measurement
Frequency
Sample
Type
Sample Location'
Flow •
6.0 MGD
ContinwoliS
Recording
Influent or Effluent
BOD, 5-day, 20°C2
13.0 mg/L
19.5 mg&
Daily
Composite
"Influent and Effluent
Total Suspended Solids2
30.0 mglL
45.0 mg/L
Daily
Composite
Influent and Effluent
NH3-N, (April 1- October 31) 3
2.0 mglL
-
Daily
Composite
Effluent
NH3-N (November 1- March 31)3
10.0 mg/L
Daily
Composite
Effluent
Dissolved 0xygen4
Daily
Grab
Effluent,
Upstream & Downstream
Fecal Colifform (geometric mean) 5
200/100 ml
400/100 ml
Daily
Grab
Effluent,
Upstream & Downstream
Temperature
Daily
Grab
Effluent,
Upstream & Downstream
Total Residual Chlorines
28 pg/L
Daily
Grab
Effluent
Conductivity
3/week
Grab
Effluent,
Upstream & Downstream
Total Nitrogen (NO2+ NO3 + TKN)
(April 1- October 31)
6.0 mg/L
Weekly
Composite
Effluent
Total Nitrogen (NO2+ NO3 + TKN)
(November 1- March 31)
Weekly
Composite
Effluent
Total Phosphorus
1.0 mg/L
Weekly
Composite
Effluent
Color?
Monthly?
Grab
Upstream & Downstream
Color?
MonthIy7
Composite
Effluent
Chronic Toxicity/3
Quarterly
Composite
Effluent
Cyanide9
12.2pg/L
22 pg/L
Weekly
Grab
Effluent
Mercury10
0.03 pg/L
Weekly
Composite
Effluent
Copper
2/month
Composite
Effluent
Zinc
2/month
Composite
Effluent
Silver
2/month
Composite
Effluent
Toluene
Quarterly
Grab
Effluent
pH1t
Daily
Grab
Effluent
Notes:
1. Upstream = at NCSR 1108. Downstream = a) NCSR 2424 and b) NCSR 564. Instream monitoring shall be grab samples taken
3/week Gune-September) and 1/week (October -May).
2. The monthly average effluent BOD5 and Total Suspended Solids concentrations shall not exceed 15% of the respective influent value (85%
removal).
3• The Division may re -open this permit to require weekly average limits for ammonia. After calculating allowable concentrations, an analysis of
past ammonia data will determine if there is a reasonable potential for this discharge to exceed these potential limits. If there is, this permit
will be re -opened. If there is not, the permit will not be re -opened, but will contain weekly average limits for ammonia upon renewal
4. The daily average dissolved oxygen effluent concentration shall not be less than 6.0 mg/L
5. Instream fecal coliform monitoring is required 3/week during summer months only (June -September). Downstream samples need
only be taken at NCSR 2424.
6. Compliance with the limit for Total Residual Chlorine shall be based upon a daily average value.
7. As a Tier 3 Facility, Crowders Creek WWTP must monitor for color at upstream and downstream monitoring stations on a monthly basis,
from April to October. In addition, monthly color samples of the effluent must be taken year-round (see A. (3) for more
information and other effluent color requirements).
8. Chronic Toxicity (Ceriodaphnia), P/F at 41% with testing in March, June, September and December (see A. (2)).
9. The detection limit for cyanide is 10.0 µg/L If the measured levels of cyanide are below the detection limit, then the measurement is
considered to be zero for purposes of compliance evaluation and should be reported on the DMR as < 10.0 µg/L •
10. The current detection limit for mercury is 0.2 wig/L. If the measured levels of mercury are below the detection limit, then the measurement is
considered to be zero for purposes of compliance evaluation and should be reported on the DMR as <0.2 µg/L If mercury is detected in
any sample, the presence of mercury can be verified using a separate split sample analyzed in accordance with EPA Method 1631. The result
from this second analysis shall be used for compliance determinations. Beginning September 1, 2003, EPA Method 1631 shall be used
in all mercury analyses. -
11. The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units.
There shall be no discharge of floating solids or visible foam in other than trace amounts.

c•
Permit NC0074268
A. (2) CHRONIC TOXICITY PASS/FAIL PERMIT LIMIT
The effluent discharge shall at no time exhibit observable inhibition of reproduction or significant mortality to
Ceriodaphnia dubia at an effluent concentration of 41%. :
The permit holder shall perform at a minimum, quarterly 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 ofMarch, June, September and December. 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, using the parameter code TGP3B for the
pass/fail results and THP3B for the Chronic Value. Additionally, DWQ Form AT-3 (original) is to be sent to the
following address:.
Attention: NC DENR / DWQ / Environmental Sciences Branch
1621 Mail Service Center
Raleigh, North Carolina 27699-1621
Completed Aquatic Toxicity Test Forms shall be filed with the Environmental Sciences Branch 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 Branch 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.
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 NC0074268
A. (3) COLOR PERMITTING REQUIREMENTS FOR TIER 3 FACILITY
Crowders Creek WWTP has been classified as a Tier 3 color discharger in accordance with North Carolina's Color
Permitting Strategy. The Permittee will conduct color monitoring of instream stations (upstream, downstream) on a
monthly basis during summer season (April -October). The Permittee will record whether a color plume was observed
around the outfall pipe during the monthly instream sampling events, and include that, information on the monthly
discharge monitoring report. Effluent samples will be collected monthly for color on a year-round basis. Color
samples will be analyzed for ADMI color at natural pH. Effluent samples will consist of 24-hour composites, while
instream samples will be collected as grabs. Samples will be analyzed by a state certified laboratory.
The Permittee will prepare a Pollution Prevention/Best Management Practices (BMPs) report. This report will address
the potential for the facility to reduce effluent color by incorporating pollution prevention measures and/or BMPs
prior to treatment. This report could include an evaluation of the dyeing process, looking at the potential for dye
substitution, improving dyeing efficiencies, etc. The report could also investigate whether any BMPs could be
implemented that would reduce the amount of color discharged to the treatment plant. The Permittee could do this
work independently, or request voluntary assistance from the North Carolina Division of Pollution Prevention and
Environmental Assistance. The Permittee will also prepare a Color Reduction Study, which will involve an end -of -pipe
treatment evaluation that develops cost estimates for reducing influent color by 75% and 90%. Both reports will be
submitted within 24 months of the permit effective date.
If data show that water quality standards for color are being violated by the discharge permitted by the terms of this
permit, then the Director may reopen this permit for the purpose of imposing additional requirements pursuant to 15A
NCAC 2H.0114. Alternatively, if future conditions change and color is no longer a component of the influent
wastestream, then the permittee may request a permit modification to remove color permit requirements.
A. (4) SECONDARY CONTAINMENT SPECIAL CONDITION
Within one year of permit issuance, the permittee shall establish a plan for spill containment around the sludge loading
area and construct secondary containment as necessary.

Re: Gastonbia permits
Subject: Re: Gastonia permits
Date: Tue, 28May 2002 08:45:45 -0400
From: Stewart:[e-mail]
To: Natalie Sierra <[e-mail]>
Natalie,
It looks like you have added the mercury testing change for 2003 and the
re -opener clause for possible weekly average ammonia limits. Thanks for
making these changes prior to issuing. Please send EPA a final permit
when issued.
Dee
Natalie Sierra
<Natalie.Sierra@n
cmail.net>
05/20/2002 12:48
PM
To:
cc:
Subject:
Dee Stewart/R4/USEPA/US@EPA
Gastonia permits
Dee -
Attached are the final permits for the City of Gastonia's two WWTPs.
Please send confirmation that it is OK to issue these.
Thanks,
Natalie
(See attached file: 74268_final.doc)(See attached file: 20184_final.doc)
(See attached file: Natalie.Sierra.vcf)
74268 final.doc
Name: 74268_final.doc
Type: Microsoft Word Document (applicationimsword)
Encoding: base64
Download Status: Not downloaded with message
20184 final.doc
Name: 20184_final.doc
Type: Microsoft Word Document (applicationimsword)
Encoding: base64
Download Status: Not downloaded with message
fNatalie.Sierra.vcf
Name: Natalie.Sierra.vcf
Type: VCard (text/x-vcard)
Encoding: base64
Download Status: Not downloaded with message
1 of 1
5/28/02 9:35 AM

RE: Crowders Creek
Subject: RE: Crowders Creek
Date: Wed, 8 May 2002 17:02:02 -0400
From: "Cummings, Larry" <[e-mail]>
To: "Natalie Sierra" <[e-mail]>
CC: "Shellenbarger, David" <[e-mail]>
Natalie,
The letters to you dated August 16, 2001,for Crowders, and August 17, 2001, for Long,
and signed by Don Carmichael, are still'the City's best statement of what we would
like to see on the permits. We mention considering an annual cap for the entire
year, plus a monthly #/day limit for TN during the summer. I don't think we would
want to consider a monthly mass loading limit in the winter --I'm not even sure that
the plants are capable of meeting such limits. It would seem best to stick with the
6mg/1 summer limit, in that case. We're not opposed to the 6mg/1 limit at both
plants, but thought the #/day during the summer, with an annual cap, would give us
some compliance flexibility. Having said all that, we think it would be best for us
to retain the 6mg/1 TN monthly average limit.
Let me know if we need to discuss further Are the permits close to
issuance?
Thanks,
Larry
Original Message
From: Natalie Sierra[mailto:[e-mail]]
Sent: Wednesday, May 08, 2002 1:27 PM
To: Cummings, Larry
Subject: Crowders Creek
Larry,
The hearing officer said that while he cannot downgrade Crowders' tier,
you may include shutdown of textile mills as part of your management
strategy (required by the permit). I was reviewing some of my other
notes for this permit as well and I can't remember what you/we decided
on nutrients. For Crowders, do you want the 6 mg/L limit in the summer
or a mass load that is equivalent to 6mg/L in the summer and 12 mg/L in
the winter (based on permitted flow)?
Thanks,
Natalie
1 of 1 5/9/02 9:59 AM

Re: [Fwd:irowders Creek WWTP NPDES Permit]
Subject: Re: [Fwd: Crowders Creek WWTP NPDES Permit]
Date: Mon, 29 Apr 2002 07:09:15 -0400
From: Dave Goodrich <[e-mail]>
To: Bobby Blowe <[e-mail]>
CC: Natalie Sierra <[e-mail]>, Jackie Nowell <[e-mail]>
I agree. If things change significantly, then they can always write us a letter to
clarify the situation and we can give specific comments then. I would note this
possibility in the cover letter, but issue the permit as recommended.
Bobby Blowe wrote:
> The 9/19/01 letter from Kings Mtn states that there are 2 dye house mills in town
that discharge to the Crowder's Creek plant. Maybe Anvil is biggest contributor,
maybe it isn't. Maybe they are closing in '03, maybe they aren't. I don't think my
recommendation would change. Confirmation of mill closings would be something that
they could include in the color reduction study. What do y'all think?
> Natalie Sierra wrote:
> > I'll probably finalize this when I get back from vacation (May 7) but wanted to
run it by all of you to see if I should change anything.
> > -Natalie
> >
> > "Cummings, Larry" wrote:
> >
> > > Natalie,
> > >
> > > It has been recently announced that the one industry that contributes most of
the color to the Crowders Creek WWTP, Anvil in Kings Mountain, is closing by January
1, 2003. We would expect the color to essentially disappear at the Crowders facility
when this textile mill closes. We thought we would pass this information along to
you, in case it might affect conditions in the Crowders permit related to color.
> > >
> > > Give me a call or email if you would like to discuss this issue further or if
you have any questions.
> > >
> > > Thanks,
> > >
> > > Larry Cummings
> > > Division Manager WWT
> > > City of Gastonia
> > > [phone]
1 of 1 5/8/02 11:58 AM

Re: [Fwd:jlrowders Creek WWTP NPDES Permit]
Subject: Re: [Fwd: Crowders Creek WWTP NPDES Permit]
Date: Fri, 26 Apr 2002 14:28:24 -0400
From: Bobby Blowe <[e-mail]>
Organization: Chief, Construction Grants and Loans Section
To: Natalie Sierra <[e-mail]>
CC: Dave Goodrich <[e-mail]>,
Jackie Nowell <[e-mail]>
The 9/19/01 letter from Kings Mtn states that there are 2 dye house mills in town
that discharge to the Crowder's Creek plant. Maybe Anvil is biggest contributor,
maybe it isn't. Maybe they are closing in '03, maybe they aren't. I don't think my
recommendation would change. Confirmation of mill closings would be something that
they could include in the color reduction study. What do y'all think?
Natalie Sierra wrote:
> I'll probably finalize this when I get back from vacation (May 7) but wanted to run
it by all of you to see if I should change anything.
> -Natalie
> "Cummings, Larry" wrote:
> > Natalie,
> >
> > It has been recently announced that the one industry that contributes most of the
color to the Crowders Creek WWTP, Anvil in Kings Mountain, is closing by January 1,
2003. We would expect the color to essentially disappear at the Crowders facility
when this textile mill closes. We thought we would pass this information along to
you, in case it might affect conditions in the Crowders permit related to color.
> >
> > Give me a call or email if you would like to discuss this issue further or if you
have any questions.
> >
> > Thanks,
> >
> > Larry Cummings
> > Division Manager WWT
> > City of Gastonia
> > [phone]
1 Bobby.Blowe.vcf
Name: Bobby.Blowe.vcf
Type: VCard (text/x-vcard)
Encoding: 7bit
Description: Card for Bobby Blowe
1 of 1 5/8/02 11:58 AM

Crowders Creek WWTP NPDES Permit
Subject: Crowders Creek WWTP NPDES Permit
Date: Tue, 23 Apr 2002 15:23:43 -0400
From: "Cummings, Larry" <[e-mail]
To: "Natalie Sierra (E-mail)" <[e-mail]>
Natalie,
It has been recently announced that the one industry that contributes most of the
color to the Crowders Creek WWTP, Anvil in Kings Mountain, is closing by January 1,
2003. We would expect the color to essentially disappear at the Crowders facility
when this textile mill closes. We thought we would pass this information along to
you, in case it might affect conditions in the Crowders permit related to color.
Give me a call or email if you would .like to discuss this issue further or if you
have any questions.
Thanks,
Larry Cummings
Division Manager WWT
City of Gastonia
[phone]
1 of 1 5/8/02 11:58 AM

NC0074268 - Crowders Creek WWTI
Subject: NC0074268 - Crowders Creek WWTP
Date: Wed, 20 Mar 2002 11:08:28 -0500
From: [e-mail]
To: [e-mail]
CC: [e-mail], [e-mail]
Natalie
Thank you for you 2/11/02 e-mail addressing Fluoride and selenium
discharged from Crowders Creek WWTP. EPA has no further comment.
Please note that this permit is still being held by EPA R4 due to its
lack of weekly average limits for NH3-N per 40 CFR 122.45(d)(1).
Additionally, this permit includes a daily maximum mercury limit with a
mercury quantification level recommended as 0.2 ug/l. This is
inconsistent with EPA approved methods 1669 and 1631C listing the
detection limit for mercury as 0.0005ug/l. The recent NC IG Report
documented that NC should require more sensitive analytical methods as
they become available. The use of a 0.2 ug/1 rather than a 0.0005 ug/1
detection limit is not consistent with the IG recommendation.
Additionally, NC Water Quality Standards list a mercury criterion of
0.012 ug/1 and the use of a 0.2 ug/1 detection limit is not sufficient
to determine compliance with the NC standards. An appropriate sensitive
detection limit should be used in this permit, per 40 CFR Part 136, 40
CFR 122.41(j)(4) and 40 CFR 123.44(c)(5). This issue would be the basis
of an EPA objection and is being discussed for several permits.
Dee Stewart
404/562-9334
1 of 1 5/8/02 11:54 AM

Gastonia Crowders Cr permit
Subject: Gastonia Crowders Cr permit
Date: Thu, 11 Oct 2001 11:42:21 -0400
From: Michelle Woolfolk <[e-mail]>
Organization: NCDENR-Division of Water Quality
To: Natalie Sierra <[e-mail]>
Natalie,
Some refinements to the Gastonia Permit
Fecal coliform monitoring during summer months only.
The old DMR data I looked at has 2 downstream monitoring sites, I only
want 1.
Ask for monitoring at SR1108 (upstream site) and
SR2424 (downstream site)
Thanks.
Michelle
MICHELLE WOOLFOLK
DWQ PLANNING BRANCH
NCDENR
1617 MAIL SERVICE CENTER
RALEIGH NC 27699-1617
PH:919/733-5083 x505 'FX:919/715-2941
[e-mail]
1 of 1 5/8/02 11:54 AM

Iifg .of 6azththa
P. O. BOX 1748
5txs#orria, Nadi! (Inrolirttt 281353-1748
DEPARTMENT OF
PUBLIC WORKS AND UTILITIES
August 16, 2001
Ms. Natalie Sierra
NCDENR/DWQ/NPDES Unit
1617 Mail Service Center
Raleigh, NC 27699-1617
1
O
7
iV
N
CD
Subject: Comments on Draft NPDES Permit Crowders Creek Wastewater Treatment Plant,
NPDES NC0074268
City of Gastonia„ Gaston County
Dear Ms. Sierra:
We appreciate the opportunity to continue to work with the Division of Water Quality (DWQ)
regarding the NPDES permitting issues for our facilities. The purpose of this letter to provide specific
comments on the subject draft NPDES permit dated July 20, 2001, which we received on July 31. We
have comments on several items in the draft permit including color requirements, nutrient limitations,
metals limitations/monitoring requirements, cyanide limitations, and other miscellaneous permit
requirements. We have organized our comments according to these topic areas.
Color Requirements
The City of Gastonia strongly supports DWQ's efforts to reduce color in the South Fork watershed
and statewide. As a result of this support, the City of Gastonia was an active member of the Color
Alliance to provide information upon which DWQ could develop a color policy. However, Crowders
Creek and our WWTP discharging to that creek were not part of the Color Alliance study. We
therefore question whether the Crowders Creek WWTP should be treated identically to those facilities
that have already been studied in detail as discussed below.
AIM/

Ms. Natalie Sierra
Page 2
August 16, 2001
We have reviewed the color policy dated June 5, 2001, in detail. The Color requirements in Part A.
(3) of our draft permit are directly based on this policy. However,. the policy is not specifically
referenced in the permit. Hence the referral to the Crowders Creek facility in Part A. (3) and in
footnote 4 of Part A. (1) as a "Tier 3 Facility" has no reference. Without the policy referenced in the
permit the term "Tier 3" has no context.
As we have indicated in correspondence to David Goodrich/DWQ on July 13, 2001, we want to know
whether other municipalities outside of the South Fork basin are also being asked to meet the
requirements of the DWQ Color Policy? The inclusion of the Crowders Creek WWTP in the
implementation plan for the policy caught us off guard since it was not part of the Color Alliance and
was also not in the South Fork basin study area — the focus for the Alliance work. We want to be
assured that we are being treated equitably with other dischargers.
Regarding the proposed handling of the Crowders Creek WWTP as a Tier 3 facility we believe that
the 12 months for PP/BMP study and 24 month time frame for the Color Reduction Study (CRS) is
insufficient. Although we are aware of the color issue at the Crowders facility, we have not had any
warning of the potential requirements at this facility since the Crowders Creek WWTP was not
included in the Color Alliance Study. Hence, we presently have no funds budgeted for additional
work in the fiscal year beginning July 1, 2001. We also believe that the City of Kings Mountain,
which is permitted as a significant industrial contributor to our facility and is a major source of color,
is also unaware of the pending requirements. We believe that 24 months and 36 months for PP/BMP
and CRS, respectively, are more reasonable schedules for these requirements since the facility was
not included in the South Fork River Color Study.
Color monitoring at the upstream and downstream sites is noted as weekly in the months April
through October in Part A. (1) while it is noted as monthly for these months on the Color Permitting
Requirements in Part A. (3). We suggest that this discrepancy be clarified so that monthly instream
monitoring for color is clearly specified including observations of whether there is a color plume. We
would also like the permit to clearly indicate that no observation of the plume is required in
November through March.
Nutrient Requirements
The limitations for Total Nitrogen (TN) are concentration based that applies only during April
through October. As indicated in previous correspondence, the City of Gastonia would prefer mass
limits for TN. Our preference is that the calculation for the mass limits be established as a monthly
average value based on permitted flow and a concentration of 6 mg/L TN. We believe these
limitations should be applicable during the months of April through October, as you have proposed
for TN concentration. Although we do not feel it is necessary to protect water quality, we are willing
to consider an option for mass -based limits which includes an annual cap on TN for the Crowders
Creek facility, as discussed in our letter to Mr. Goodrich dated July 13.

Ms. Natalie Sierra
Page 3
August 16, 2001
Metals and Cyanide
We appreciate the elimination of several metals from the proposed monitoring requirements from an
earlier draft of the permit. Our consultant has reviewed your analysis of whether there is a reasonable
potential to exceed (RPE) water quality standards, action levels, or other criteria. We still believe that
some of the proposed requirements are not necessary. Comments on each metal/parameter are
summarized below.
Silver
A monitoring frequency of two times per month was recommended for silver. Only two of the 36
sample values used in the DWQ analysis actually had any detectable silver; therefore, 95 percent of
the samples were below the detection limit. The detected values were quite low and since the
detection limit is above the Action Level, any detected values will result in a maximum probable
concentration (MPC) above the allowable level. Given the low frequency of detection, we are not sure
of the value of this twice per month monitoring. We believe that quarterly monitoring in conjunction
with the Long Term Monitoring Program (LTMP) through our Pretreatment requirements will be
sufficient to demonstrate that there will be no adverse aquatic effects. In addition, the sample type on
Part A.(1) of the proposed permit should be "composite" rather than "grab".
Copper and Zinc
A monitoring frequency of two times per month was recommended for copper and zinc. We are not
sure of the value of this monitoring since we have a pretty good record of copper and zinc
concentrations and no indication of a toxicity problem. While we will accept twice per month
monitoring, monthly monitoring is sufficient to track major changes over time as a result of changing
industrial contributions. In addition, the sample type on Part A.(1) of the proposed permit should be
"none wai e" rather than "grab".
Toluene
A monitoring frequency of two times per month was recommended for toluene. There was no toluene
detected in 67 samples evaluated as part of DWQ's data analysis. We believe no monitoring for this
pollutant is necessary and it is not included in our LTMP.
Cyanide
DWQ's RPE analysis indicates that MPC is barely in excess of the acceptable level. This actually
demonstrates a significant reduction in cyanide levels since the analysis conducted by CH2MHILL
for our permit application for an earlier 3 years period showed a higher MPC. The proposed limits are
12.2 ug/L as a weekly average and 22 ug/L as a daily maximum value. The 22 ug/L value is based on
one half of the final acute value (FAV) while the 12.2 ug/L value is based on the water quality
standard of 5 ug/L and instream waste concentration (IWC) of 41 percent. We accept that this should
be the basis for the weekly average permit limit. However, we also believe that developing a limit

Ms. Natalie Sierra
Page 4
August 16, 2001
based on meeting one-half the FAV in the discharge with no allowance for dilution is excessive. We
suggest no daily maximum value for cyanide because the weekly average value is essentially a daily
maximum with a weekly monitoring requirement.
The City would respectfully request consideration of above comments and looks forward to meeting
with DWQ staff on August 27. Please contact Larry Cummings at 704-854-6670 if you have any
questions regarding our comments.
Sincerely,
Donald E. Carmichael, P.E.
Director of Public Works and Utilities
CLT\CrowdersPermit801.doc
c: Danny Crew/City Manager
Ash Smith/Deputy City Attorney
Larry Cummings/Interim Wastewater Superintendent
Bill Kreutzberger/CH2M HILL
David Goodrich/DWQ
CERTIFIED MAIL 7000 0600 0023 7549 0892

Draft NPDES Permits for Gastonia
Subject: Draft NPDES Permits for Gastonia
Date: Thu, 26 Jul 2001 07:57:34 -0400
From: "Cummings, Larry" <[e-mail]>
To: "Natalie Sierra (E-mail)" <[e-mail]>
CC: "Carmichael, Don" <[e-mail]>,
"Bill Kreutzberger P.E. (E-mail)" <[e-mail]>
Natalie,
Thank you for forwarding the draft permits to us. I will keep August
27th open for your visit with the hearing officer, and we look forward
to seeing you then.
We may have more comments after we have had time to review the permits
thoroughly, but one item immediately caught my attention. The Crowders
permit lists TRC as a daily average, while the Long permit lists TRC as
a daily maximum. We discussed this issue when you and Dave met with us
earlier, and it was my understanding that we could get the daily average
TRC in the Long permit if we requested it in writing. We did request
the daily average TRC for both permits in our correspondence to Dave,
dated July 13th-perhaps this request didn't make it to your attention
before the draft permits were issued. In any case, the daily average
TRC is an important issue for us, and we would respectfully request that
the State consider listing the TRC as a daily average in both the
Crowders and Long permits.
Thanks and looking forward to seeing you on the 27th,
Larry Cummings
Interim Superintendent WWTD
City of Gastonia
1 of 1 7/26/01 8:57 AM

Crowders NPDES Draft Permit
Subject: Crowders NPDES Draft Permit
Date: Thu, 26 Jul 2001 11:24:48 -0400
From: "Matherly, Nancy" <[e-mail]>
To: "Natalie V. Sierra" <[e-mail]>
I noticed that the copper , zinc, and silver samples listed on Crowders
draft permit are grab samples. This is not a problem, but as the metal
samples for Long's draft permit are listed as composites, we want
confirmation that this is intentional and not a typographical error.
Please confirm that these Crowders metals samples should be grabs so
that we may proceed in planning the necessary changes.
1 of 1 7/26/01 12:52 PM

AMENDMENT TO NPDES PERMIT APPLICATION
Background
In mid-2001 the U.S. Environmental Protection Agency, which oversees North Carolina's
NPDES permit program, determined that the state's application form for major municipal
dischargers is inadequate. The EPA indicated that the form does not require a summary of
the applicant's wastewater characteristics, as EPA's standard form does, and does not
provide the necessary public record for permit issuance. Since July 2001, EPA has objected
to the issuance of approximately forty permit renewals until the permittees provide complete
applications.
In recent discussions with the Division of Water Quality, the EPA recently agreed that the
Division may provide the monitoring information on each permittee's behalf rather than
require the facilities to complete new applications. The permittees have already submitted
discharge monitoring, reports (DMRs) under the terms of their NPDES permits, and the
Division can easily produce summaries for each facilty. However, the Division does not have
the legal authority to amend a facility's application; each permittee must give its consent in
order for the Division to submit this information on its behalf. North Carolina will provide
a summary of discharge monitoring reports as additional documentation to ensure the
record is complete.
The statement below is designed to give the Division the authority to submit this data on
behalf of the permittee for this one instance. Other than signing the statement below,
no further action will be required on the part of the permit holder. Furthermore, this
will not change the substance of the draft permit already issued by the Division.
PLEASE SIGN AND RETURN THE FOLLOWING STATEMENT AS SOON AS
POSSIBLE. THIS STATEMENT WILL CONSTITUTE AN OFFICIAL ?"RRMIT — -_. _.
AMENDMENT. In order to expedite the renewal of your permit, please fathe __ _ _,
signed form to (919)-733-0719 and send the original to: ti.�
NCDENR/DWQ/NPDES UNIT ` 4 4 1617 Mail Service Center 4,
Raleigh, NC 27699-1617 1 I r---
Imo)
Certification of Permit Application Amendment
c-,
w
0
"I certify that this information, to the best of my knowledge and belief, is true, c ¢T.-,
and accurate. This information, including any data provided, amends the current�af i6i� __"_ """"
for reissuance of NPDES permit number NC0074268 submitted to the North Carolina
Department of Environment and Natural Resources, Division of Water Quality, on
February 7, 2000."
Signature of P it Holder
Date
/2/2a/al

AMENDMENT TO NPDES PERMIT APPLICATION
Background
In mid-2001 the U.S. Environmental Protection Agency, which oversees North Carolina's
NPDES permit program, determined that the state's application form for major municipal
dischargers is inadequate. The EPA indicated that the form does not require a summary of
the applicant's wastewater characteristics, as EPA's standard form does, and does not
provide the necessary public record for permit issuance. Since July 2001, EPA has objected
to the issuance of approximately forty permit renewals until the permittees provide complete
applications.
In recent discussions with the Division of Water Quality, the EPA recently agreed that the
Division may provide the monitoring information on each permittee's behalf rather than
require the facilities to complete new applications. The permittees have already submitted
discharge monitoring reports (DMRs) under the terms of their NPDES permits, and the
Division can easily produce summaries for each facilty. However, the Division does not have
the legal authority to amend a facility's application; each permittee must give its consent in
order for the Division to submit this information on its behalf. North Carolina will provide
a summary of discharge monitoring reports as additional documentation to ensure the
record is complete.
The statement below is designed to give the Division the authority to submit this data on
behalf of the permittee for this one instance. Other than signing the statement below,
no further action will be required on the part of the permit holder. Furthermore, this
will not change the substance of the draft permit already issued by the Division.
PLEASE SIGN AND RETURN THE FOLLOWING STATEMENT AS SOON AS
POSSIBLE. THIS STATEMENT WILL CONSTITUTE AN OFFICIAL PERMIT
AMENDMENT. In order to expedite the renewal of your permit, please fax the
signed form to (919)-733-0719 and send the original to:
NCDENR/DWQ/NPDES UNIT
1617 Mail Service Center
Raleigh, NC 27699-1617
Certification of Permit Application Amendment
"I certify that this information, to the best of my knowledge and belief, is true, complete,
and accurate. This information, including any data provided, amends the current application
for reissuance of NPDES permit number NC0020184 submitted to the North Carolina
Department of Environment and Natural Resources, Division of Water Quality, on July 27,
1999."
01/, / 2120/a/
Signature o rmit Holder 1 Date

O`�ATFR
NCDENR
Mr. Don Carmichael, P.E.
City of Gastonia
P.O. Box 1748
Gastonia, North Carolina
Dear Mr. Carmichael:
Michael F. Easley
Governor
William G. Ross, Jr., Secretary
North Carolina Department of Environment and Natural Resources
Gregory J. Thorpe, Ph.D., Acting Director
Division of Water Quality
September 28, 2001
Subject: Modification to NPDES Permit NC0074268
Crowders Creek WWTP
Gaston County
On August 16, 2001, you requested a two -month extension on the compliance date for the total
nitrogen limit in your current permit. In that permit, total nitrogen limits are effective as of September 1,
2001. Due to construction delays at your facility, the Division recognizes that a two -month extension on
this compliance date is necessary. Such an extension translates to winter monitoring of total nitrogen
effective November 1, 2001 and summer limits and monitoring for total nitrogen beginning April 1, 2002.
Please find enclosed the revised permit pages. The revised pages should be inserted into
your permit. The old pages may then be discarded. All other terms and conditions contained in
the original permit remain unchanged and in full effect. This permit modification is issued under
the requirements of North Carolina General Statutes 143-215.1 and the Memorandum of
Agreement between North Carolina and the U. S. Environmental Protection Agency.
If any parts, measurement frequencies or sampling requirements contained in this permit
modification 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 a written petition conforming to
Chapter 150B of the North Carolina General Statutes, filed with the Office of Administrative Hearings
(6714 Mail Service Center, Raleigh, North Carolina 27699-6714). Unless such demand is made, this
decision shall be final and binding.
If you have any questions or comments concerning this draft permit, please contact Natalie Sierra
at 919-733-5083 extension 551 or via e-mail at: [e-mail].
Sincerely,
adon.
'regory J. Thorpe, Ph.D.
NPDES Unit
cc: Mooresville Regional Office/Water Quality Section
NPDES Unit
Mr. Roosevelt Childress, US EPA
Central Files
Point Source Compliance and Enforcement Unit
N. C. Division of Water Quality / NPDES Unit
1617 Mail Service Center, Raleigh, NC 27699-1617
Internet: h2o.enr.state.nc.us
Phone: [phone]
fax: [phone]
DENR Customer Service Center: 1 800 623-7748

•
•
Permit No. NC0074268
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 from outfall(s) serial number 001. Such discharges shall be limited and monitored by
the Permittee as specified below:
iaily
aximum
;Measurement;
Frequency;
Flow
BOD, 5-day, 20°C2
TSS2
6.0 MGD
13.0 mg/1
30.0 mg/1
19.5 mg/1
45.0 mg/1
Continuous
Daily
Daily
Recording
Composite
Composite
I or E
E,I
E,I
NH3-N, (April 1 - October 31)
NH3-N, (November 1 - March 31)
Dissolved Oxygen3
Fecal Coliform (geometric mean)
Temperature
Total Residual Chlorine
Conductivity
Total Nitrogen (NO2+ NO3 + TKN)
(April 1- Oct 31)4
Total Nitrogen (NO2+ NO3 + TKN)
(Nov 1 - March 31)
Total Phosphorus
Chronic Toxicity5
Cyanide6
Selenium
Cadmium
Chromium
Lead
2.0 mg/1
10.0 mg/1
200/100 ml
6.0 mg/14
1.0 mg/1
400/100 ml
12.2 ug/1
12.2 ug/1
28.0 ug/1
53.5 ug/1
48.7 ug/1
Daily
Daily
Daily
Daily
Daily
Daily
3/week
Weekly
Weekly
Weekly
Quarterly
Weekly
Weekly
2/month
2/month
2/month
Composite
Composite
Grab
Grab
Grab
Grab
Grab
Composite
Composite
Composite
Composite
Grab
Composite
Composite
Composite
Composite
E
E
E,U,D
E
E,U,D
E
E,U,D
Mercury
Toluene
2/month
2/month
Grab
Grab
pH8
Daily
Grab
Notes:
1
Sample locations: E - Effluent, I - Influent, U - Upstream at NCSR 1108, D - Downstream at a) NCSR 2424 and b) NCSR 564.
Instream monitoring shall be grab samples taken 3/wk (Jun -Sep) and 1/wk (Oct -May).
2 The monthly average effluent BOD5 and Total Suspended Solids concentrations shall not exceed 15% of the respective influent
value (85% removal).
3 The daily average dissolved oxygen effluent concentration shall not be less than 6.0 mg/1.
4 Total Nitrogen limits become effective April 1, 2002.
5 Chronic Toxicity (Ceriodaphnia), P/F, 41%; March, June, September, and December; See Supplement to Effluent Limitations and
Monitoring Requirements Page - Special Conditions for flow of 6.0 MGD.
6 The detection limit for cyanide is 10.0 ug/1. If the measured levels of cyanide are below the detection limit, then the measurement
is considered to be zero for purposes of compliance evaluation and should be reported on the DMR as < 10.0 ug/1.
The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units.
There shall be no discharge of floating solids or visible foam in other than trace amounts.

(nig f (5tzfrntia
P. O. BOX 1948
ilitxstartia, Yurtli Carolina 28053-1748
DEPARTMENT OF
PUBLIC WORKS AND UTILITIES
August 16, 2001
Mr. David A. Goodrich, Supervisor
NPDES Permitting Unit
Division of Water Quality, NCDENR
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
Subject
City of Gastonia Crowder's Creek WWTP - Total Nitrogen Effluent Limitation
NPDES Permit No. NC0074268
Dear Mr. Goodrich:
rt - n
�I c
CD
CV
0
_J
As you know, the above referenced NPDES discharge permit for our Crowder's Creek facility, which expired August
31, 2000, requires us to meet a 6.0 mg/L total nitrogen effluent limitation effective September 1 of this year. With this
letter, we are hereby requesting a two month extension to that schedule of compliance, to be incorporated into our new
permit, such that the effluent limitation for total nitrogen will begin April 1, 2002, with monitoring only required
November through March.
Operated as an A/O facility prior to June of this year, the Crowder's Creek WWTP was designed as an extended
aeration facility with an upstream anaerobic condition providing for soluble phosphorus release and subsequent uptake
in the oxic zone. As such, the facility was biologically removing phosphorus in addition to removing ammonia via
nitrification. Nutrient enrichment concerns downstream of our discharge prompted the Division of Water Quality to
install a 6.0 mg/L total nitrogen limit. In response to this new effluent limitation, in conjunction with our average
effluent TN concentration of 14.0 mg/L, construction began in November of 2000 of a $1.5 million dollar upgrade to
allow for biological nitrogen removal via denitrification. The project consisted of the repartitioning of the aeration
basins to provide anoxic zones for denitrification, adding piping to allow step feed into the basins, and the
installation of nitrate recycle pumping.
Construction was expected to last no longer than 6 months, however due to unanticipated delays, construction actually
took 8 months. The project was substantially complete on June 1 of this year. After completion, train A was operated
in a plug flow mode with the nitrate recycle pump operational Traic B was operated in a step feed mode without
nitrate recycle. Effluent total nitrogen remained approximately the same. On June 20, both basins were placed in step
feed mode, with recycle pumps operating at full speed. Effluent total nitrogen was reduced to 11.0 mg/L. In mid -July,
the DO was reduced in the area of the recycle pump, and the operating speed of the nitrate recycle pump was reduced.
Effluent total nitrogen was reduced to approximately 8.0 mg/L.
With less than a month left before the effective date of our total nitrogen limit and 2.0+ mg/L left to go, additional time
is needed for process optimization. The City intends to use the additional time requested to optimize the process.
These efforts could include:

August 16, 2001
Mr. David A. Goodrich
Page 2
• Reduction of DO in oxic cells;
• Reduction of DO carryover into anoxic cells; _
• Variations in flow splits to the step feed points; and
• Further adjustment of recycle and return rates.
Extension of the compliance schedule for our total nitrogen limitation should give the City the time it needs to develop
an operational strategy capable of consistently meeting the 6.0 mg/L limitation.
Thank you for your assistance with this matter. If you have comments, questions, or concerns, please do not hesitate to
contact me at [phone].
Sincerely,
Larry W. �ummings
Interim Superintendent WWTD
City of Gastonia
Copies:
Don Carmichael, Director of Public Works and Utilities/City of Gastonia
Ash Smith, Deputy City Attorney/City of Gastonia
Rex Gleason, DENR Mooresville Regional Office
Shannon Langley, DWQ Point Source Compliance/Enforcement Unit
Ross Stroud, Arcadis G&M

DENR/DWQ
FACT SHEET FOR NPDES PERMIT DEVELOPMENT
NPDES No. NC0074268
acility "Information
pl"acantlJacil"ity N"arise:"
City of Gastonia Crowders Creek WWTP
Applicant Address
Y.O. Box 1748; Gastonia, North Carolina 28053-1748
Facility Address:
Off US Highway 321 south of Gastonia
P"ermitted'Flow"°'
6.0 MGD
42% Domestic
58% Industrial
Facility/Permrt::Stat
Class 1V/Active; Renewal
County:
Gaston County
viisceianeous
Receiving Stream:."
Crowders Creek
Regional Ottrce: ""
Mooresville
Stream Classification:.
C
State Und U
S Quad
C14NW
5030) Listed
Subbasin:
Yes
03-08-37
Yernzit"Writer . "
Date:
Natalie Sierra
21 February01
Drainage;
ea (miz
70.4
Sunme"r 7Q 10 (cts). ',
13.3
W"inter 7Q1O (c
20
30Q2 (cts) :.
Average ;F low (cts)
28
82
IWC"("
42
Lat. 35° 10 10" N Long. 81° 11' 48" W
BACKGROUND
Crowders Creek WWTP is one of two wastewater treatment plants operated by the City
of Gastonia. The plant has a permitted flow of 6.0 MGD. The facility serves the south western
portion of the City of Gastonia service area and accepts domestic wastewater from the City of
Clover, SC and East Kings Mountain. In addition, the plant also accepts wastewater from 9
significant industrial users (SIUs) and as such, has a full Long Term Monitoring Program
(LTMP) with the Pretreatment program.
At the time of the last permit renewal, the facility was having a number of compliance
problems. It has since applied for an Authorization to Construct (ATC) that would allow for
capital improvements, most notably to the aeration basins. In addition, the on -site laboratory has
implemented some clean lab analysis techniques that achieve more accurate detection results.
The municipality has also been working with DENR's Pollution Prevention program (PP),
participating in both the Common Sense Initiative and development of an Environmental
Management System (EMS). These measures should aid in the facility's compliance with
NPDES permit limits.
As of September 1, 2001, the facility will have nutrient limits as part of the Lake Wylie
management strategy. A year round limit of 1 mg/L of total phosphorus and a summer total
nitrogen limit of 6 mg/L will be imposed.
Instream Monitoring and Verification of Existing Conditions and DMR Data Review.
Data dating from January 1998 through December 2000 were reviewed. Average flow
during this time was 3.5 MGD with an average BOD of 2.93 mg/L. Total phosphorus averaged
1.67 mg/L (slightly above the upcoming limit of 1 mg/L). Total nitrogen values averaged 13.40
mg/L.
Dissolved Oxygen instream data were analyzed for the permit renewal. For all of 2000,
the dissolved oxygen (DO) values downstream of the discharge were above 7 mg/L. Two
downstream sampling points have been established in the instream monitoring requirement, one
of which is south of the NC/SC border. The difference between this sampling point and the point
closer to the discharge averaged 0.04 mg/L — the two sites get nearly identical DO data. The
average DO drop from upstream to downstream was 0.5 mg/L. Please see the attached plot of
DO stream data for more information.
Fact Sheet
NPDES NC0074268 Renewal
Page 1

Crowders Creek also monitors for a broad range of metals due to the large industrial
!contribution to its wastestream. Data from both the Pretreatment LTMP and the DMRs were
used to assess reasonable potential for arsenic, cadmium, chromium, lead, copper, nickel, silver,
zinc, cyanide, mercury, molybdenum, and selenium.
Verification of Existing Conditions
A May 2000 ATC was issued for modification of existing aeration basins, replacement of
manholes for splitter boxes, installation of a nitrate recycle pump station, installation of a
dissolved oxygen control system, replacement of diffusers with fine bubble membrane aeration
system, and modifications to the existing raw sludge pumping station. Construction is currently
underway and several of these measures should assist the facility in meeting total nitrogen and
phosphorus limits that will become effective in September 2001.
Results of Reasonable Potential Analysis (RPA):
A reasonable potential analysis (RPA) was performed for all monitored parameters. It
was determined that there is reasonable potential for violations of instream standards of the
following:
• Copper
• Cyanide
• Silver
• Zinc
• Mercury
No reasonable potential exists for the following:
• Arsenic
• Cadmium
• Chromium
• Lead
• Nickel
• Molybdenum
• Selenium
Copper, Silver, and zinc are all action level pollutants; these compounds will be
monitored only, not limited. The current NPDES permit limits cyanide and mercury
already, though some modifications will be made to the current daily maximum limits.
Correspondence:
The inspection reports describe the facility as well -maintained with problems in
monitoring and reporting. The facility has received four NOVs/NODs following inspections,
largely for deficiencies in self -monitoring and laboratory work. There have been several NOVs
issued per year for permit effluent violations as well. Since 1998, seven TRC violations, two
cyanide violations and one fecal coliform violation have been reported. Two bypass/overflow
situations have been reported during the last permitting cycle.
The inspection reports and most recent staff report (Samar Bou-Ghazale, 2000), request a
provision addressing sludge loading deficiencies. There are currently no provisions for spill
containment at the site, and any sludge spilled enters a catch basin leading to a pipe that
discharges to Crowders Creek.
PERMITTING STRATEGY AND SUMMARY OF PROPOSED CHANGES
There is concern about the contribution that the effluent from this plant makes to the
receiving stream in terms of both color and nutrients. Nutrient limits will become effective in
September of this year, and upgrades to the plant should be effective in nutrient removal. The
facility has been monitoring color for a little over a year, but due to the high level of color
observed in the effluent, will be permitted using the 2001 Color Permitting Strategy for the South
Fork Catawba River. Under this strategy, the facility will be classified as a Tier 3 facility, which
Fact Sheet
NPDES NC0074268 Renewal
Page 2
Qatoi
4Lii27`

has associated effluent and instream monitoring requirements as well as the development of site
specific BMPs.
The facility has requested that the total residual chlorine sample be made a daily average
instead of a daily maximum. Such a concession has been granted to other municipalities in the
state, and will be granted to Gastonia. As per the request of the Mooresville Regional Office, a
special condition will be added requiring the facility to provide secondary containment in the
sludge loading area.
Due to the results of the reasonable potential analysis, cadmium, chromium, selenium,
and lead will be removed from the effluent limits page, though they will continue to be
monitored on a quarterly basis through the Pretreatment LTMP. The cyanide daily maximum
limit will change due to a policy change on daily maximum limits for metals. A daily maximum
mercury limit will be imposed. -
In addition, the facility has requested that the following footnote for mercury be included:
The detection limit for mercury is 0.2 ug/l. If the measured levels of mercury are below the detection
limit, then the measurement is considered to be zero for purposes of compliance evaluation and should be
reported on the DMR as <0.2 ug/I. If mercury is detected in any sample, the presence of mercury can be
verified using a separate split sample analyzed in accordance with EPA Method 1631.
Gastonia has recently begun to perform clean laboratory techniques in order to obtain
more precise mercury and cyanide data. In a conversation with Roy Byrd of the Chemistry Lab,
Mr. Byrd indicated that Method 1631 is preferred by the EPA and the DWQ Director, Tommy
Stevens and as such, is an acceptable method for obtaining more precise mercury data. The
footnote has been reviewed and approved by Mr. Byrd. The facility does not wish to report
values below the detection level because they feel that such data are imprecise and do not impart
reliable information. Accordingly, Gastonia will be allowed to report <detection level for both
mercury and cyanide.
PROPOSED SCHEDULE FOR PERMIT ISSUANCE
Draft Permit to Public Notice: July 20, 2001
Permit Scheduled to Issue: September 17, 2001
NPDES DIVISION CONTACT
If you have questions regarding any of the above information or on the attached permit, please contact
Natalie Sierra at [phone] ext. 551.
NAME:
REGIONAL OFFICE COMMENTS
DATE:
•
71y'es. To ✓ is G"A/'
7- H-6, ca./ zA), 5/fryle-s- ?
i,1
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•
SUPERVISOR: 2 /2 �DATE:
Fact Sheet
NPDES NC0074268 Renewal
Page 3

Year
Influent Flow BOD COD TSS NH3-N TKN NO2+NO3 TN TP Residual Chlorine Fecal
MGD mg/L mg/L mg/L mg/L mg/I mg/I mg/L mg/L ug/L #/100m1
1998 Average 3.5
Min 1.5
Max 8.9
1999 Average 3.6
Min 1.5
Max 8.7
2000 Average 3.5
Min 1.7
Max 8.3
*3.1
*0.6
*12.3
*2.8
*0.5
*19.6
*2.9
*1.0
*12.2
48.8 *2.8
24 *0.3
124 *12.5
49.5 *5.0
28 *0.5
80 *55.0
55.9 *4.5
31 *0.5
88 *34.3
0.3 2.4 9 11.5 1.5 *6.6 *692.4
0 1 0.1 2.1 0.4 *5.0 *1.0
1.6 5.1 17.7 20.9 6.5 *60.0 *123000.0
*0.3 3 11.8 14.9 1.7 *10.6 *1673.0
*0.1 1.4 4.8 8 0.5 *10.0 *1.0
*9.8 5.1 30.8 34.2 14.4 *80.0 *413000.0
*0.3 3.6 *10.1 13.8 1.8 *10.7 *29.6
*0.1 1.6 *0.3 7.8 0.2 *10.0 *1.0
*2.4 28.8 *28.7 31.5 6.1 *78.0 *5400.0
Total Average
Min
Max;
51 40 4.10 0 30 3,00 10.40 13.40 1.67 9.30 798.33
24 0.3 0 1 01 2.1 0.2 5 1
124 0 1.6 28.8 30.8 34 2' 1 4.4 80 413000
NUTRIENT LOADINGS
w/
summer
winter
6 mg/I Load Based on Current Ave Flow: Actual ave load 394.8712 ppd
12 mg/L 96802 pounds per year
Load Based on Permitted Flow:
164381 pounds per year
144128 poundsperyear

REASONABLE POTENTIAL ANALYSIS
Prepared by: Natalie Sierra, 2/19/01
Facility Name =
NPDES # =
Qw (MGD) =
Qw (cfs) =
7Q10s (cfs)=
IWC (%) =
Crowders Creek WWfP
NC0074268
6
9.2832
13.3
41.15
Parameter
Chronic CCC w/s7Q10 dil. Acute CMC w/no dil.
FINAL RESULTS, ug/I FINAL RESULTS, ug/I
Frequency of Detection
#Samples # Detects
Arsenic
Max. Pred Cw
Allowable Cw
Cadmium
Max. Pred Cw
Allowable Cw
Chromium
Max. Pred Cw
Allowable Cw
Lead
Max. Pred Cw
Allowable Cw
Copper (A.L.)
Max. Pred Cw
Allowable Cw
Nickel
Max. Pred Cw
Allowable Cw
10.6
121.5
3.2
4.9
55.3
121.5
11.6
60.8
443.8
17.0
85.8
213.8
360
15
1022
34
7.3
261
36
93
93
95
36
36
4
2
30
13
36
32
Silver (A.L.)
Max. Pred Cw
Allowable Cw
Zinc (A.L.)
Max. Pred Cw
Allowable Cw
Cyanide
Max. Pred Cw
Allowable Cw
Mercury
Max. Pred Cw
Allowable Cw
26.8
0.1
868.0
121.5
13.7
12.2
0.4
0.029
1.2
67
22
NA
36
36
142
94
2
36
0
2
Molybdenum
Max. Pred Cw
Allowable Cw
Selenium
Max. Pred Cw
Allowable Cw
Toluene
Max. Pred Cw
Allowable Cw
36.0
NA
7.5
12.2
2.9
0.0-2.9-
NA
20
NA
36
142
67
15
4
0
Modified Data: Use 0.5 Detection Limit for non -detects
SNO-d; 17 w cX cep; vre Sd rt ' .

Parameter= Arsenic
Standard = 50 pg/I
Dataset= DMR99
Parameter= Cadmium
Standard= 2 pg/1
Dataset= DMR99
Modified Data Nondetects RESULTS Modified Data Nondetects RESULTS
<a 0 Std Deo. 0.956 1 <2.0 Std Deo. 0.274
1 <2.0 Mean 1.333 1 <2.0 Mean 0.941
1 <2.o C.V. 0.717 1 <2.0 C.V. 0.292
1 <2.0 Sample# 36.000 1 <2.0 Sample# 93.000
1 <2.0 1 <2.0
1 <2.0 Mutt Factor= I 2.1171 1 <2.0 Mutt Factor=
1 <2.0 Max. Value 5.000 pg/l 1 <2.0 Max. Value 2.500 pgll
2 Max. Pred Cw 10.585 pgll 1 <2.0 Max. Pred Cw 3.230 pgll
1 <2.0 Allowable Cw 121.505 pgll 1 <2.0 Allowable Cw 4.860 pgll
1 <2.0 1 <2.0
2 1 <2.0
1 <2.0 1 <2.0
<2.0 1 <2.0
<2.0 _ 1 <2.0
2 1 <2.0
2 1 <2.0
$ <10.0 1 <2.0
5 <10.0 2
1 <2.0 1 <2.0
1 <2.0 1 <2.0
1 <2.0 1 <2.0
1 <2.0 1 <2.0
1 <2.0 1 <2.0
<2.0 <2.0
. <2.0 <2.0
<2.0 <2.0
1 <2.0 1 <2.0
1 <2.0 1 <2.0
1 <2.0 1 <2.0
1 <2.0 1 <2.0
<2.0 <2.0
<2.0 <2.0
<2.0 • <2.0
<2.0 <2.0
<2.0 1. <2.0
1 <2.0 1 <2.0
1 <2.0
1 <2.0
1 <2.0
1 <2.0
1 <2.0
1 <2.0
0.5 <1.0
0.5 <t.o
0.5 <1.o
1 <2.0
1 <2.0
1 <2.0
1 <2.0
1 <2.0
1 <2.0
1 <2.0
1 <2.0
1 <2.0
1 <2.0
2.5 <5.0
1 <2.0
0.5 <1.0
1 <2.0
0.5 <1.0
0.5 <1.0
0.5 <1.0
1 <2.0
1 <2.0
1 <2.0
1 <2.0
1 <2.0
1 <2.0
1 <2.0
1 <2.0
0.5 <1.0
1 <2.0
1 <2.0
1 <2.0
1 <2.0
1 <2.0
1 <2.0
1 <2.0
1 <2.0
1 <2.0
1 <2.0
0.5 <1.0
1 <2.0
1 <2.0
0.5 <1.0
1 <2.0
0.5 <1.0
0.5 <1.0
0.5 <1.0
0.5 <1.0
1
0.5 <1.0
0.5 <1.0
1.2921
Parameter = Chromium
Standard = 50
Dataset= DMR99
p90
ModifiedData Nondetects RESULTS
10 <20.0 Std Deo.
1 <2.0 Mean
1 <2.0 C.V.
10 <20.o Sample#
10 <20.0
10 <20.0 Mutt Factor=
1 <2.0 Max. Value
10 <20.o Max. Pred Cw
10 <20.0 Allowable Cw
10 <20.0
1 <2.0
10 <20.0
10 .20.0
32
10 <20.0
10 <20.0
1 <2.0
10 <20.0
10 <20.0
1 <2.0
10 <20.0
10 <20.0
10 <20.0
10 <20.0
1 <2.0
10 <20.0
10 <20.0
10 <20.0
1 <2.0
10 <20.0
10 <20.0
10 <20.0
1 <2.0
10 <20.0
10 <20.0
10 <20.0
1 <2.0
10 <20.0
10 <20.0
10 <20.0
10 <20.0
1 <2.0
10 <20.0
1 <2.0
10 <20.0
1 <2.0
10 <20.0
1 <2.0
10 <20.0
4
10 <20.0
1 <2.0
10 <20.0
16
10 <20.0
12
10 <20.0
1 <2.0
1 <2.0
12
3
2
4.2
11
9.5
3
1 <2.0
5.6
2.6
6.2
3
9.6
2.2
1 <2.0
2.1
1 <2.0
1 <2.0
2
1 <2.0
1 <2.0
2.2
1 <2.0
2.4
3
3
2.5 <5.0
4
5
4
3
3
6
15
5.170
7.105
0.728
93.000
1 1.7281
32.000 pg/l
55.296 pg/I
121.505 pgll

Parameter =
Standard =
Dataset=
Lead
Parameter=
Standard =
Dataset=
Copper (AL.)
Parameter =
- Standard =
Dataset=
Nickel
25
7I pg8
88 pg4
DMR99
DMR99 (12/99-8/99)
DMR99 12/99-4/99
ModifiedData
Nondetects RESULTS
ModifiedData
Nondetects RESULTS
ModifiedData
Nondetects RESULTS
1
<2.0 Std Dev.
0.815
14
Std Dev.
30.879
6
Std Dev.
11.584
1
<2.0 Mean
1.247
11.1
Mean
23.147
3.7
Mean
10.260
1
<2.0 C.V.
0.653
17.6
C.V.
1.334
10.6
C.V.
1.129
3
Sample#
95.000
14
Sample#
36.000
30
Sample#
36.000
<2.0
10
1
<2.0
2
Mult Factor =
1 1.6531
12
Mutt Factor =
L 3.1701
8
Mutt Factor =
1 2.8601
1
<2.0 Max. Value
7.000 pg/I
10
Max. Value
140.000 pg8
10
Max. Value
30.000 pg8
1
<2.0 Max. Pred Cw
11.571 pgll
18
Max. Pred Cw
443.800 pg8
6
Max. Pred Cw
85.800 pg/I
s
Allowable Cw
60.753 pg/I
23
Allowable Cw
17.011 141
2
Allowable Cw
213.849 pg/I
2
16
10
2
18
8
1
<2.0
10
4
1
<2.0
10
4
1
<2.0
10
4
1
<2.0
36
18
1
<2.o
23.8
9
1
<2.0
140
5
<10.0
1
<2.0
170
5
<10.0
1
<2.0
16
10
<2.0
12
6
1
<2.0
24
10
<2.0
23.6
17
<2.0
30.9
5.6
1
<2.0
85.2
23.6
1
<2.0
75.6
5.1
1
<2.0
22.2
17
1
<2.0
10
18.6
1
<2.0
16
13.6
2
17.4
5.9
1
<2.0
15.9
4.6
1
<2.0
12
6
1
<2.0
14
6
1
<2.0
10
5
<10.0
1
<2.o
13
5
1
<2.o
11
6
7
12
6
<2.0
1
<2.0
1
1
<2.0
a,o
1
<2.0
1
<2.0
1
<2.0
2
1
<2.0
1
<2.0
2
2
1
1
1
1
2
2
1 <2.0
1 <2.0
1 <2.0
2.5 <5.0
1 <2.0
1 <2.0
1 <2.0
1 <zo
1 <2.0
1 <2.0
1 <2.0
1 <2.0
1 <2.0
1 <2.0
1 <2.0
1 <2.0
1 <2.0
1 <2.0
1 <2.0
1 <2.0
1 <2.0
1 <2.0
1 <2.0
1 <2.0
1 <2.0
1 <2.0
1 <2.0
1 <2.0
1 <2.0
1 <2.0
1 <2.0
1 <2.0
1 <2.0
1 <2.0
1 <2.0
1 <2.0
21
<2.0
1 <2.0
1 <2.0
1 <2.0
<2.0
<2.0
<2.0
'a.0

ModifiedData
1
1
1
10
1
1
1
1
1
2
1
1
1
1
1
1
1
2.5
1
1
1
5
5
5
5
1
5
2.5
5
1
10
1
2.5
1
1
1
Silver (A.L.)
0.06
Nondetects
<2.0
<2.0
<2.0
<20.0
<2.0
<2.0
<2.0
<2.0
<2.0
<2.0
<2.0
<2.0
<2.0
<2.0
<2.0
<2.0
<5.0
<2.0
<2.0
<2.0
<10.0
<10.0
<10.0
<10.0
<2.0
<10.0
<5.0
<10.0
<2.0
<2.0
<5.0
<2.0
<2.0
<2.0
pg/I
RESULTS
Std Dev.
Mean
C.V.
Sample#
Mult Factor =
Max. Value
Max. Pred Cw
Allowable Cw
2.409
2.319
1.039
36.000
2.680
10.000 pg/I
26.800 pg/I
0.146 pg/I
Zinc (A.L.)
Parameter =
Standard =
Dataset= DMR99
ModifiedData
350
70
62
90
83
70
42
65
59
67
73
74
46
50
86
110
66
170
56
51
90
52
83
72
72
88
66
62
80
64
150
68
61
63
94
68
50
pg/I
(12/99-11/99)
Nondetects RESULTS
Std Dev.
Mean
C.V.
Sample#
Mult Factor =
Max. Value
Max. Pred Cw
Allowable Cw
122.91
131.00
0.94
36.00
2.480
350.0 pg/I
868.0 pg/I
121.505 pg/I
Parameter =
Standard =
Dataset= DMR99

:',',
135 a,
1.25
r.
.„,.
`'"
.,"
.`,Tg
410.0
<1.
<10.0
<MP
:161
MOD
410.0

Parameter
Standard =
Dataset=
Mercury
0.012
DMR99
pg8
ModifiedData Nondetects RESULTS
0.1 <0.2 Std Dev. 0.023
0.1 < Mean 0.103
0.1 < C.V. 0.223
0.1 < Sample# 94.000
0.1 <
0.1 < Mutt Factor=
0.1 < .Max. Value
0.1 < 'Max. Pred Cw
0.1 < Allowable Cw
0.1 <
0.2
0.1 <
0.1 <
0.1 <
0.1 <
0.1 <
0.1 <
0.1 <
at <
0.1 <
0.1 <
0.1 <
0.1 <
0.1 <
0.1 <
0.1 <
0.1 <
0.1 <
0.1 <
0.1 <
0.1 <
0.1 <
0.1 <
0.1 <
0.1 <
0.1 <
0.1 <
0.1 <
0.1 <
0.1 <
0.1 <
0.1 <
0.31
0.1 <0.2
0.1 <0.2
0.1 <0.2
0.1 <0.2'
0.1 <0.2
0.1 <0.2
0.1 <0.2
0.1 <0.2
0.1 <02
0.1 <0.2
0.1 <0.2
0.1 <0.2
0.1 <0.2
0.1 <0.2
0.1 <0.2
0.1 <0.2
0.1 <0.2
0.1 <0.2
0.1 <02
0.1 <0.2
0.1 <0.2
0.1 <0.2
0.1 <02
0.1 <02
0.1 <0.2
0.1 <0.2
0.1 <0.2
0.1 <0.2
0.1 <0.2
0.1 <02
0.1 <02
0.1 <0.2
0.1 <02
0.1 <0.2
0.1 <0.2
0.1 <0.2
0.1 <02
0.1 <0.2
0.1 <02
0.1 <0.2
0.1 <0.2
0.1 <0.2
0.1 <0.2
0.1 <0.2
0.1 <0.2
0.1 <0.2
0.1 <0.2
0.1 <0.2
0.1 <0.2
0.1 <0.2
0.1 <0.2
L 1.2231
0.300 pgll
0.367 pg0
0.029 pg8
Parameter= Molybdenum
Standard= Ipgn
Dataset= DMR99
ModifiedData Nondetects RESULTS
5 <10.0 Std Dev. 3.940
5 <10.0 Mean 5.476
5 <10.0 G.V. 0.719
5 <10.0 Sample# 36.000
6
5 Mult Factor=
5 <10.0 Max. Value 17.000 pgll
5 <10.0 Max. Pred Cw 36.023 pg8
5 Allowable Cw 0.000 pgll
5 <10.0
2.1191
2
5 <10.0
<2.0
1 <2.0
4
3.8
10 <20.0
10 <20.0
5 <10.0
10
12
0.05 <0.1
1 <2.0
1 <2.0
1 <2.0
5 <10.0
2.2
1 <2.0
5.8
12
17
12.8
5 <10.0
10
6
2.5 <5.0

0.453
• . t ..asa7
Max. Value 000 pun
Mar tared Cat c0
Allowable 12.is rvnan
02.0
Rd
024
02-0
020
25 AS 0
2585o2.4.10
25 <0 Samples 07.000
.1
25 .5.0 Max. Value 00 rw
25 .5.0 Alaa. Prod Car ass psn
Allowable a. 20.731 pal
25 AS.0
25 AS.0
25 AS.0
2.5 25.sa
25 ASO
zs sa
25 .5.0
25 50
2.5 50
25.0
25 ASO
25 50
25 .50
25 AS 0
25 .50
25 .0
an
020
Ate 2 5 .50
a0 25 50
25 .50
<3.0 2..5 .5.0
.20
.20
.20
.100
.▪ 20
.20
.20
20
<20
A.
. 20
.20
<20
.20
20
< 20
.20
.20
.20
. 20
ASO
..0
.20
20
20
.0
20
<20
.20
.20
<20
<20
.20
20
20la,. non..< deeds
W 07 0
20
20
20

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Year
Influent Flow BOD COD TSS NH3-N TKN NO2+NO3 TN TP Residual Chlorine Fecal
MGD mg/L mg/L mg/L mg/L mg/I mg/I mg/L mg/L ug/L #/100m1
1998 Average
Min
Max
1999 Average
Min
Max
2000 Average
Min
Max
3.5
1.5
8.9
3.6
1.5
8.7
3.5
1.7
8.3
*3.1
*0.6
*12.3
*2.8
*0.5
*19.6
*2.9
*1.0
*12.2
48.8
24
124
49.5
28
80
55.9
31
88
*2.8
*0.3
*12.5
*5.0
*0.5
*55.0
*4.5
*0.5
*34.3
0.3
0
1.6
*0.3
*0.1
*9.8
*0.3
*0.1
*2.4
2.4
1
5.1
3.
1.4
5.1
3.6
1.6
28.8
9
0.1
17.7
11.8
4.8
30.8
*10.1
*0.3
*28.7
11.5
2.1
20.9
14.9
8
34.2
13.8
7.8
31.5
1.5
0.4
6.5
1.7
0.5
14.4
1.8
0.2
6.1
*6.6
*5.0 ,
*60.0
*10.6
*10.0
*80.0
*10.7
*10.0
*78.0
*692.4
*1.0
* 123000.0
*1673.0
*1.0
*413000.0
*29.6
*1.0
*5400.0
Total Average 3 3.53 2.93 5140
Min
ax $.a9 0 " -x124 0
.0.304 3.00 10.40 13 40:. 1.67 0.3 n `- a798 33.
.1.6 � 8 8p ' 30'8 34.2 14 4 '80. � 413000

450
400
350
300
250
200
150
100
50
0
12/6/99
•
1/25/00
3/15/00
5/4/00 6/23/00
Date
8/12/00
10/1/00
11/20/00

NPDES/Non-Discharge Permitting Unit Pretreatment Information Request Form
NPDES OR NONDISCHARGE PERMITTING UNIT COMPLETES THIS PART:
Date of Request 2/21/01
Facility
City of Gastonia - Crowders Creek
Permit #
NC0074268
Region
Mooresville
Requestor
Natalie Sierra
Pretreatment A_D Towns- Keyes McGee (ext. 580)
Contact E-L Towns- Deborah Gore
M-R Towns- Dana Folley (ext. 523)
S-Z Towns- Steve Amigone (ext 592)
_ °l
'PRETREATMENT UNIT COMPLETES THIS PART:
Status of Pretreatment Program (circle all that apply)
1) the facility has no SIU's and does have a Division approved Pretreatment Program that isINACTIVE
2) the facility has no SIU's and does not have a Division approved Pretreatment Program
3) the facility has (or is developing) a Pretreatment Program-7
2a is Full Program with LTMPf or 2b) is Modified Program with STMP
4) the facility MUST develop a Pretreatment Program - Full Modified
5) additional conditions regarding Pretreatment attached or listed below
Flow Permitted Actual
Industrial
STMP time frame:
most recent
3,39sw`v)D z„k„ge\ tvq�p
next cycle
% Domestic c 0, b$� MVD
-
L
T
M
P
Pollutant
Check List
POC due to
NPDES/Non-
Discharge
Permit Limit
Required
by EPA*
Required by
503 Sludge**
POC due to SIU***
Site specific POC (Provide Explanation)****
STMP V
Frequency
effluent
at
U
LTMP
Frequency at
effluent
✓BOD
✓
./'
4
AM
,.TSS
✓
✓
4
Q
M
"NH3
✓
✓
4
Q
M
✓
Arsenic
./
4
Q
M
4
Cadmium
Vr,.,0V
Al
✓
./
4
Q
M
4
Chromium
./ r..0.
q
✓
✓
4
Q
M
'i
Copper
4
✓
✓
4
Q
M
/
Cyanide
✓
✓
4
Q
M
II
Lead
,/ „,-., .
✓
✓
4
Q
M
✓
Mercury
./ ,,....0.
✓
✓
4
Q
M
✓Molybdemum
✓
4
Q
M
J
Nickel
4
✓
4
Q
M
✓
Silver
✓
4
Q
M
/
Selenium
✓
./
✓
4
Q
M
J
Zinc
\I
./
✓
4
Q
M
‘-'`Coka.\
tJ
✓ rn.o-
4
Q
M
"`-vb'tr1\
c s .
" w.. o.
✓
4
tv
M
4
Q M
4
Q M
4
Q M
4
Q M
*Always in the LTMP
**Only in the LTMP if the POTW land applies sludge
*** Only in LTMP while the SIU is connected to the POTW
**** Only in LTMP when the pollutant is a specific concern to the POTW (ie-Chloride to a POTW who accepts Textile waste)
Q= Quarterly
M=Monthly (jj,
Comments: v FrOM litw iR kl. \i:Do C) vr..O. :vY\ b(..*rh4 VN1y . — - w\\ 'S `O
J
ry\l�nHn0V Zook .
1^- 1'
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-QQVrrTz. n— ON, f ke-d o o A-oN• l v` o \ t_A\< . \ ek'1n Saai aL---W P d
NPDES _P I R Ff o rm.000804
Revised: August 4, 2000
\ d or � Q� � -;� Z-3 1j v-3- : s
c&r' e.f bcLc--K na� +1�� ` knock).

( I fg of Oastaxrht
P. O. BOX 1748
Gastonia, North earulixta 28053-1748
DEPARTMENT OF
PUBLIC WORKS AND UTILITIES
July 13, 2001
Mr. David Goodrich
NCDENR/DWQ/Permits
1617 Mail Service Center
Raleigh, NC 27699-1617
Subject: Follow-up items from June 27, 2001 Meeting
NPDES NC0020184 -City of Gastonia, Long Creek Wastewater Treatment Plant
NPDES NC0074268-City of Gastonia, Crowders Creek Wastewater Treatment Plant
Dear Dave:
We previously sent you the minutes from our meeting on June 27, 2001. In these minutes, we
identified a number of follow-up action items to address through formal correspondence. These action
items include:
• Total Nitrogen Limitations
• Color Requirements
• Total Residual Chlorine Limitation
• Metals Monitoring Requirements
We have organized our comments according to each of these items below. However, we will be
addressing metals monitoring requirements in a separate letter since we require supplemental
information from DWQ prior to analyzing your preliminary proposal for monitoring requirements.

Mr. David Goodrich
Page 2
July 13, 2001
Total Nitrogen Limitations
As indicated in the permit applications for both facilities, the City of Gastonia would prefer mass
limits for TN for both the Long Creek and Crowders Creek facilities. Our preference is that the
calculation for the mass limits be established as a monthly average value based on permitted flow and
a concentration of 6 mg/L TN. We also believe these limitations should be applicable during the
months of April through October, as you have indicated would be the case with limitations based on
TN concentration.
We appreciate your consideration of this request by offering to consider a mass basis for our TN
limits. However, we do not think the additional requirement for an annual cap on TN (based on
permitted flow and 12 mg/L TN in the winter months) is necessary. We also have specific problems
at the Long Creek WWTP that preclude us from accepting any requirements that could prevent
maintenance activities during the winter, as I will explain below.
During a recent expansion of the Long Creek WWTPfrom 8 to 16 MGD capacity, the wastewater
processes were modified to include biological nutrient removal. A key component of this system is a
denitrification basin which is key to effective removal of TN in the system. As a result of problems
that occurred during construction, based upon an independent structural analysis, this basin has severe
structural problems that require periodic maintenance throughout the year and significant annual
maintenance during the winter. We anticipate that this basin will require major renovation or
replacement during the course of the next permit term. Until litigation concerning the construction of
this facility is resolved and until corrective measures are fully implemented, Gastonia must plan on
lengthy winter maintenance for this facility. In addition, TN mass limits during the summer also
provide flexibility for us to perform shorter term maintenance if necessary to avoid a catastrophic
failure of this system.
In conclusion, we would like DWQ to reconsider our request for mass based limits during the summer
months at both the Long Creek and Crowders Creek facilities. If this is not acceptable, we would
prefer to accept summer mass based limits with an annual cap as described above at both facilities but
include a schedule for compliance with the annual mass for the Long Creek WWTP. This schedule
would need to extend nearly the entire permit term. Our third preference would be to accept summer
mass based limits with an annual cap as described above at the Crowders Creek Plant and a TN
concentration limit of 6 mg/L in for summer months only at Long Creek as is now effective in our
Permits. As indicated at the meeting, we are presently meeting TN requirements at the Long Creek
WWTP. At your suggestion, a letter was submitted to Rex Gleason officially rescinding our request
for a Special Order by Consent (SOC) at Long Creek WWTP.
Color Requirements
We have reviewed the proposed color policy and have comments regarding the applicability of the
policy to both our facilities. While the Long Creek WWTP was included in the study performed by
the Color Alliance, the Crowders Creek facility was not included in the study. We believe that at a

Mr. David Goodrich
Page 3
July 13, 2001
minimum, this difference needs to be considered in the implementation schedule for color
requirements at the Crowders facility as discussed below.
Long Creek WWTP
We believe that DWQ has inaccurately prioritized our Long Creek facility. As a result of the dramatic
reductions in color that have occurred at the Long Creek WWTP with the recent closure of industrial
contributors, we believe this facility should be considered a Tier 1 facility. Even prior to the
shutdown of Fleischmann's Yeast (an industrial contributor who caused the effluent to have a "tea -
like" color), there was no downstream impact from color in the effluent. Since Fleischmann's closed,
the effluent is extremely clear. The only visible plume is -of the clear effluent discharging into a
frequentlymudd_y" river_W-e-do-not-believe-a-Pollution Prevention/BMP—(— PBMP) study -is -needed
at this time because color levels are quite low. We believe the color monitoring with the reopener as
proposed for Tier 1 facilities in the DWQ Color Policy should be sufficient to monitor the problem
and address concerns if theyre-appear.
Crowders Creek WWTP
The first issue we want to raise is whether other municipalities outside of the South Fork basin are
also being asked tomeet the requirements of the DWQ Color Policy? The inclusion of the Crowders
Creek WWTP in the implementation plan for the policy caught us off guard since it was not part of
the Color Alliance and was also not in the South Fork basin study area — the focus for the Alliance
work. We want to be assured that we are being treated equitably -with other dischargers?
Regarding the proposed handling of the Crowders Creek WWTP as a Tier 3 facility we believe that
the 12 months for PP/BMP study and 24 month time frame for the Color Reduction Study (CRS) are
insufficient. Although we are aware of the color issue at the Crowders facility, we have not had any
warning of the potential requirements at this facility since the Crowders Creek WWTP was not
included in the Color Alliance Study. Hence, we presently have no funds budgeted for additional
work in the fiscal year beginning July 1, 2001. We also believe that the City of Kings Mountain,
which is permitted as a significant industrial contributor to our facility and is a major source of color,
is also unaware of the pending requirements. We believe that 24 months and 36 months for PP/BMP
and CRS, respectively, are more reasonable schedules for theserequirements since the facility was
not included in the South Fork River Color Study.

Mr. David Goodrich
Page 4
July 13, 2001
Total Residual Chlorine (TRC)
As discussed at the meeting, we are requesting that TRC be included as a daily average limit rather
than a daily maximum value. This will allow short-term variability of TRC levels to be averaged over
a day, if necessary
Metals Monitoring Requirements
As indicated above, we will send separate correspondence on this issue after we receive the results of
the reasonable potential to exceed analysis from Natalie Sierra when she returns from vacation.
The City would respectfully request a meeting with you and your staff to discuss_thesejssues atyouur
convenience, prior to release of the draft permits. Please contact me at [phone] to schedule a
time we can meet.
Sincerely,
Interim Superintendent WWTD
cc: Danny Crew/City Manager
Ash Smith/ Deputy City Attorney
Don Carmichael/Director Public Works and Utilities
Bill Kreutzberger/CH2M HILL
(/Nataile Sierra/DWQ

State of North Carolina
Department of Environment
and Natural Resources
Division of Water Quality
James B. Hunt, Jr., Governor
Wayne McDevitt, Secretary
A. Preston Howard, Jr., P.E., Director
AA
DENR
November 25, 1998
Mr. Don Carmichael, P.E.
City of Gastonia
Post Office Box 1748
Gastonia, North Carolina 28053-1748
Subject: NPDES Permit Modification/Settlement
And Water Quality Monitoring Plan
Approval — Revised
Permit No. NC0020184
Long Creek WWTP
Permit No. NC0074268
Crowders Creek WWTP
Gaston County
Dear Mr. Carmichael:
On October 7, 1998, the Division sent the modification and settlement of the Long Creek
WWTP and Crowders Creek WWTP permits and a letter documenting and explaining the
modifications to these permits. Approval of the Water Quality Monitoring Plan for Long Creek
WWTP was also included with this letter.
Larry Cummings (Gastonia) noted a few errors that were made on the effluent sheets of
the Long Creek WWTP and Crowders Creek WWTP permits. On the Long Creek WWTP
effluent sheet (with a permitted flow equal to 16.0 MGD), the sample type for lead should be
composite (not grab). On the Crowders Creek WWTP effluent sheet, the sample type for
cadmium should be composite (not grab) and the mercury sample type should be grab (not
composite). The Division recognizes that grab sampling facilitates better clean sampling for
mercury analysis.
The Division has not enclosed an entire permit for both the Long Creek WWTP and
Crowders Creek WWTP. Please find enclosed the modified sections of the permit referenced in
the preceding paragraph. Replace the original sections in your permit with the newer enclosed
sections and discard the original sections. All other terms and conditions contained in the
original permit remain unchanged and in full effect. These permit modifications are issued
pursuant to the requirements of North Carolina General Statutes 143-215.1 and the Memorandum
of Agreement between North Carolina and the U.S. Environmental Protection Agency.
P.O. Box 29535, Raleigh, North Carolina 27626-0535 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer 50% recycled/ 10% post -consumer paper

Mr. Carmichael
Page 2
November 25, 1998
The Division also enclosed another copy of the approved Water Quality Monitoring Plan
for Long Creek WWTP.
If you have any questions, please contact Paul Clark at [phone], ext. 580.
Sincerely,
Original Signed By
David A. Goodrich
A. Preston Howard, Jr., P.E.
cc: Central Files
Mooresville Regional Office, Water Quality Section
Roosevelt Childress, EPA
NPDES Unit (Permit Files)
Point Source Compliance/Enforcement Unit

Permit No. NC0074268
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,
City of Gastonia
is hereby authorized to discharge wastewater from a facility located at
Crowders Creek Wastewater Treatment Plant
off US Highway 321
south of Gastonia
Gaston County
to receiving waters designated as Crowders Creek in the Catawba River Basin
in accordance with effluent limitations, monitoring requirements, and other conditions set forth in Parts I,
II; III, and IV hereof. _ . .
The permit shall become effective November 25, 1998
This permit and the authorization to discharge shall expire at midnight on August 31, 2000
Signed this day November 25, 1998
Original Signed By
David A. Goodrich
A. Preston Howard, Jr., P.E., Director
Division of Water Quality
By Authorityof the Environmental Management Commission

Permit No. NC0074268
SUPPLEMENT TO PERMIT COVER SHEET
City of Gastonia
is hereby authorized to:
1. Continue to operate an existing 6.0 MGD wastewater treatment facility consisting of a
mechanical bar screen, grit removal,, an influent pump station, dual primary clarifiers, dual
anoxic/oxic basins for biological phosphorus removal which includes anaerobic basins with
mechanical mixers and aerobic basins with diffused aeration, dual final clarifiers, two
polishing/stabilization ponds, a chlorine contact chamber (gas), SO2 dechiorination, a static
post aerator, a dissolved air floatation (DAF) unit, four anaerobic digesters, one gravity
sludge thickener, one filter ,belt press dewatering unit, alum and caustic addition. Wastewater
treatment facility is located at Crowders Creek Wastewater Treatment Plant, off US Highway
321, south of Gastonia, Gaston County (See Part III of this permit), and
2. Discharge wastewater from said treatment works at the location specified on the attached
map into Crowders Creek which is classified Class C waters in the Catawba River Basin.

Latitude:35° 10' 10"
Longitude:81° 11' 48"
USGS Quad #:G14NW
River Basin #:030837
Receiving Stream: Crowders Creek
Stream Class: C
City of Gastonia
NC0074268
Gaston County
CrowdersCreekWWTP

A (1). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS : Permit No. NC0074268
During the period beginning on the effective date of the permit and lasting until expiration, the Permittee is authorized to discharge from outfall(s) serial number
001. Such discharges shall be limited and monitored by the Permittee as specified below:
1EFI=ILUENTCHARA TERISTI.G4�x
°1%'r. , f
ems/ F� ,_,e,•' „ a }%. ✓'i r, ,:,: ,, ,x'<<. �. �..
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r ,� �x
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ING RE.. DIRE
(�
,. ,.. 4..
��Y ' y
,
MEN, S/
I, I
vs.; Y
,. � � �,�
y..�ral e, ,
Weekl
�, Y
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x Average . ,
� ,Dail y�
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' Maximum
�:M easureme t
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�Frequency
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� , p
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cations ,.
Flow
6.0 MGD
Continuous
• Recording
1 or E
BOD, 5-day, 20°C2
13.0 mg/I
19.5 mg/I
Daily
=. • Composite
E,I
TSS2
NH3-N,
30.0 mg/I
45.0 mg/I
Daily
• Composite .
- • E,I
(April 1 - October 31)
NH3-N,
2.0 mg/I ,.
Daily
,•' Composite
• E '
(November 1 - March 31)
10.0 mg/I •
Daily
Composite
E
Dissolved Oxygen3
Fecal
Daily
Grab
E,U,D
Colitorm (geometric mean)
Temperature '
200/100 ml
400/100 ml
Daily ,
Grab
E =
Total
Daily
Grab •
E,U,D
Residual Chlorine
Conductivity
28.0 u g /I
Dad y � �
Grab •
3/week
Grab _
- - U,D
dotal Nitrogen (No2+ No3+ TKN) (April 1- Oct 31)
6.0 mg/I4
Weekly .
-- Composite
' E
otal Nitrogen (No2+ No3 + TKN) (Nov 1 - March 31)
Weekly
Composite • =
, E,
Total Phosphorus
1.0 mg/l4
Weekly-
,°. ‘ Composite -
E
Chronic Toxicity5
Quarterly
- Composite , >
E
Cyanides
12.2 ug/l
53.5 ug/I
Weekly
Grab
E
Selenium
12.2 ug/I
48.7 ug/l
Weekly
- Composite
E
Cadmium .
-
2/month
Composite
E
Chromium
Lead
2/month
Composite
E
2/month
Composite
E
Mercury _
2/month
Grab
E
Toluene
-
2/month
Grab
E
Notes:
i Sample locations: E - Effluent, I - Influent, U - Upstream at NCSR 1108, D - Downstream at a) NCSR 2424 and b) NCSR 564. lnstream monitoring
shall be grab samples taken 3/wk (Jun -Sep) and 1/wk (Oct -May).
2 The monthly average effluent BOD5 and Total Suspended Solids concentrations shall not exceed 15% of the respective influent value (85% removal).
3 The daily average dissolved oxygen effluent concentration shall not be less than 6.0 mg/I.
4 TN and TP limits become. effective September 1, 2001.
5 Chronic Toxicity (Ceriodaphnia), P/F, 41%; March, June, September, and December; See Supplement to Effluent Limitations and Monitoring Requirements
Page - Special Conditions for flow of 6.0 MGD. •
6 The detection limit for cyanide is 10.0 ug/I. If the measured levels of cyanide are below the detection limit, then the measurement is considered to be zero
for purposes of compliance evaluation and should be reported on the DMR as < 10.0 ug/I.
The pH shall not be less than 6:0 standard units nor greater than 9.0 standard units and shall be monitored daily at the effluent by grab sample.
There shall be no discharge of floating solids or visible foam in other than trace amounts.
.)

Permit No. NC0074268
SUPPLEMENT TO EFFLUENT LIMITATIONS
AND MONITORING REQUIREMENTS
SPECIAL CONDITIONS
A(2). CHRONIC TOXICITY PASS/FAIL PERMIT LIMIT (QRTRLY)
The effluent discharge shall at no time exhibit chronic toxicity using test procedures outlined in the "North
Carolina Ceriodaphnia Chronic Effluent Bioassay Procedure," Revised November 1995, or subsequent
versions.
The effluent concentration at which there may be no observable inhibition of reproduction or significant
mortality is 41. % (defined as treatment two in the procedure document). The permit holder shall perform
quarterly monitoring using this procedure to establish compliance with the permit condition. The tests will be
performed during the months of March, June, September, and December. Effluent sampling for this testing
shall be performed at the NPDES permitted final effluent 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, DWQ Form AT-1 (original) is to be sent to the following address:
Attention: _ Environmental Sciences Branch
North Carolina Division of
Water Quality
• 4401 Reedy Creek Road
Raleigh, North Carolina 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 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
Branch at the -address cited above.
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 the permittee fail to monitor during a month in which toxicity monitoring is required, 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
Water Quality 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, 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.
QCL P/F Version 9/96

State of North Carolina
Department of Environment
and Natural Resources
Division of Water Quality
James B. Hunt, Jr., Governor
Wayne McDevitt, Secretary
A. Preston Howard, Jr., P.E., Director
October 7, 1998
Mr. Don Carmichael, P.E.
City of Gastonia
Post Office Box 1748
Gastonia, North Carolina 28053-1748
DENR
Subject: NPDES Permit Modification/Settlement
And Water Quality Monitoring Plan
Approval
Permit No. NC0020184
Long Creek WWTP
Permit No. NC0074268
Crowders Creek WWTP
Gaston County
Dear Mr. Carmichael:
This letter provides documentation and an explanation of the modifications to the City of
Gastonia's NPDES permits. The City of Gastonia and the Division of Quality have thoroughly
discussed each of the items in this letter, so that the two parties should be in agreement on the
permit modifications and the petition for contested case can be withdrawn (see withdrawal form
attached to this letter).
Imposition of Concentration -Based Nutrient Limits — Long Creek WWTP (16.0 MGD to South
Fork Catawba River)
The construction required to upgrade Long Creek WWTP has been delayed to the point
that a full summer of operation was not possible in 1998. The permit has been modified so that
the concentration limit for total nitrogen will take effect April 1, 2000.
The diversion of wastewater flow from Long Creek WWTP to Crowders Creek WWTP is
a viable option that may or may not be implemented, and this option will not be referenced in the
NPDES permit. It may not be necessary to divert wastewater to the Crowders Creek facility
given the upgraded Long Creek WWTP is near completion.
As stated in the June 5, 1998 letter from J. Gordon Arbuckle, Fleischmann's Yeast
supports the permit modifications described in the two preceding paragraphs.
Instream Monitoring — Long Creek WWTP
Gastonia and the Division both agree on the importance of instream monitoring.
Gastonia currently monitors instream water quality at four stations, one upstream, and three
downstream of the discharge location. It could take several years to collect adequate data at
these stations reflecting base stream flows. Sampling during this flow regime is necessary to
determining the dissolved oxygen (DO) sag during the most critical stream conditions.
P.O. Box 29535, Raleigh, North Carolina 27626-0535 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer 50% recycled/ 10% post -consumer paper

Mr. Carmichael
Page 2
October 7, 1998
Based on the complexity of the hydraulics in this system, Gastonia and the Division
agreed that Gastonia shall conduct several synoptic sampling events to occur during low stream
flows. This effort should identify the dissolved oxygen sag location on the South Fork Catawba
River downstream of the Long Creek WWTP discharge point. A water quality monitoring plan
has been prepared by the City of Gastonia and is hereby approved by the Division. Monitoring
will be performed in accordance with the approved plan. This monitoring plan will be an
enforceable part of the Long Creek WWTP NPDES permit. All data collected as part of this
monitoring requirement will be reported within one month after sample collection. Following
identification of the DO sag, the permit may be modified to include the DO sag location as a
permanent instream monitoring station.
Cyanide — Crowders Creek WWTP and Long Creek WWTP
A quantitation level of 10 ug/1 has been incorporated into both WWTPs. The Division is
willing to meet with Gastonia and their consultant, CH2M HILL, to discuss additional data needs
necessary to justify a quantitation level greater than 10 ug/1.
Metals — Crowders Creek WWTP and Long Creek WWTP
Based on updated data and a statistical analysis of this information, Gastonia and the
Division have agreed to the following changes:
• Crowders Creek WWTP — eliminate cadmium, chromium, lead, and mercury limits.
• Long Creek WWTP (8.0 MGD to Long Creek) — eliminate lead limit.
• Long Creek WWTP (8.0 MGD to S. Fork Catawba River) — eliminate cadmium limit (Note:
this discharge does not have a lead limit in the permit).
• Long Creek WWTP (16.0 MGD to S. Fork Catawba River) — eliminate cadmium and lead
limits.
Mercury — Long Creek WWTP
The weekly average mercury limit in the Long Creek WWTP permit will become a daily
maximum limit, thus eliminating the weekly average limit for this parameter.
Expiration Date Changes — Crowders Creek WWTP and Long Creek WWTP
In an effort to balance the NPDES permitting schedule, the expiration dates of facilities
within certain river basins and subbasins have been changed. Please note that the expiration date
of the Crowders Creek WWTP has changed from September 30, 2001 to August 31, 2000 and
the expiration date of the Long Creek WWTP has changed from September 30, 2001 to January
31, 2000.
Please find enclosed the modified sections of the permit referenced in the preceding
paragraph. Replace the original sections in your permit with the newer enclosed sections and
discard the original sections. All other terms and conditions contained in the original permit
remain unchanged and in full effect. These permit modifications are issued pursuant to the
requirements of North Carolina General Statutes 143-215.1 and the Memorandum of Agreement
between North Carolina and the U.S. Environmental Protection Agency.

Mr. Carmichael
Page 3
October 7, 1998
If you have any questions, please contact Paul Clark at [phone] ext. 580.
Sincerely,
-1L/A. Preston o ard, Jr., P.E.
cc: Central Files
Mooresville Regional Office, Water Quality Section
Roosevelt Childress, EPA
NPDES Unit (Permit Files)
Point Source Compliance/Enforcement Unit

Permit No. NC0074268
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,
City of Gastonia
is hereby authorized to discharge wastewater from a facility located at
Crowders Creek Wastewater Treatment Plant
off US Highway 321
south of Gastonia
Gaston County
to receiving waters designated as Crowders Creek in the Catawba River Basin
in accordance with effluent limitations, monitoring requirements, and other conditions set forth in Parts I,
II, III, and IV hereof.
The permit shall become effective November 1, 1998
This permit and the authorization to discharge shall expire at midnight on August 31, 2000
Signed this day October 7, 1998
reston , r., ' . erector
Division of Wa er Quality
By Authority of the Environmental Management Commission

SUPPLEMENT TO PERMIT COVER SHEET
City of Gastonia
is hereby authorized to:
Permit No. NC0074268
1. Continue to operate an existing 6.0 MGD wastewater treatment facility consisting of a
mechanical bar screen, grit removal, an influent pump station, dual primary clarifiers, dual
anoxic/oxic basins for biological phosphorus removal which includes anaerobic basins with
mechanical mixers and aerobic basins with diffused aeration, dual final clarifiers, two
polishing/stabilization ponds, a chlorine contact chamber (gas), SO2 dechlorination, a static
post aerator, a dissolved air floatation (DAF) unit, four anaerobic digesters, one gravity
sludge thickener, one filter belt press dewatering unit, alum and caustic addition. Wastewater
treatment facility is located at Crowders Creek Wastewater Treatment Plant, off US Highway
321, south of Gastonia, Gaston County (See Part III of this permit), and
2. Discharge wastewater from said treatment works at the location specified on the attached
map into Crowders. Creek which is classified Class C waters in the Catawba River Basin.

Latitude:35° 10' 10"
Longitude:81° 11' 48"
USGS Quad k;Gl4NW
River Basin #:030837
Receiving Stream: Crovklers Creek
Stream Class:
City of Gastonia
NC0074268
Gaston County -
Cro-wdersCreekVAVIP

A (1). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS Permit No. NC0074268
During the period beginning on the effective date of the permit and lasting until expiration, the Permittee is authorized to discharge from outfall(s) serial number
001. Such discharges shall be limited and monitored by the Permittee as specified below:
EFFLUENT CHARACTERISTICS
LIMITS
MONITORING REQUIREMENTS
Monthly
Average
Weekly
Average
Daily
Maximum
Measurement
Frequency
Sample
Type
Sample
Location1
Flow
6.0 MGD
Continuous
Recording
I or E
BOD, 5-day, 20°C2
13.0 mg/I
19.5 mg/1
Daily
Composite
E,I
TSS2
30.0 mg/I
45.0 mg/1
Daily
Composite
E,I
NH3-N, (April 1 - October 31)
2.0 mg/1
Daily
Composite
E
NH3-N, (November 1 - March 31)
10.0 mg/I
Daily
Composite
E
Dissolved Oxygen3
Daily
Grab
E,U,D
t-ecal Colrform (geometric mean)
200/100 ml
400/100 ml
Daily
Grab
L
Temperature
Daily
Grab
E,U,D
I otal Residual Chlorine
28.0 ug/I
Daily
Grab
L
Conductivity
-- - _
3/week
Grab
U,D
I otal Nitrogen (No2+No3 + TKN) (April 1- Oct 31)
6.0 mg/14
Weekly
Composite
E
Total Nitrogen (No2+ No3 + TKN) (Nov 1 - March 31)
--
Weekly
Composite
E
I otal Phosphorus
1.0 mg/14
Weekly
Composite
E
Chronic Toxicity5
Quarterly
Composite
E
Cyanides
12.2 ug/I
53.5 ug/I
Weekly
Grab
E
Selenium
12.2 ug/I
48.7 ug/I
Weekly
Composite
E
Cadmium
2/month
Grab
E
Chromium
2/month
Composite
E
Lead
2/month
Composite
E
Mercury
2/month
Composite
E
Toluene
2/month
Grab
E
Notes: v l
1 Sample locations: E - Effluent, I - Influent, U - Upstream at NCSR 1108, D - Downstream at a) NCSR 2424 and b) NCSR 564. Instream monitoring
shall be grab samples taken 3/wk (Jun -Sep) and 1/wk (Oct -May).
2 The monthly average effluent BOD5 and Total Suspended Solids concentrations shall not exceed 15% of the respective influent value (85% removal).
3 The daily average dissolved oxygen effluent concentration shall not be less than 6.0 mg/I.
4 TN and TP limits become effective September 1, 2001.
5 Chronic Toxicity (Cerioda hnia�, P/F, 41%; March, June, September, and December; See Supplement to Effluent Limitations and Monitoring Requirements
Page - Special Conditions or ow of 6.0 MGD.
6 The detection limit for cyanide is 10.0 ug/I. If the measured levels of cyanide are below the detection limit, then the measurement is considered to be zero
for purposes of compliance evaluation and should be reported on the DMR as < 10.0 ug/I.
The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units and shall be monitored daily at the effluent by grab sample.
There shall be no discharge of floating solids or visible foam in other than trace amounts.

Permit No. NC0074268
SUPPLEMENT TO EFFLUENT LIMITATIONS
AND MONITORING REQUIREMENTS
SPECIAL CONDITIONS
A(2). CHRONIC TOXICITY PASS/FAIL PERMIT LIMIT (QRTRLY)
The effluent discharge shall at no time exhibit chronic toxicity using test procedures outlined in the "North
Carolina Ceriodaphnia Chronic Effluent Bioassay Procedure," _ Revised November 1995, or subsequent
versions.
The effluent concentration at which there may be no observable inhibition of reproduction or significant
mortality is 41 % (defined as treatment two in the procedure document). The permit holder shall perform
quarterly monitoring using this procedure to establish compliance with the permit condition. The tests will be
performed during the months of March, June, September, and December. Effluent sampling for this testing
shall be performed at the NPDES permitted final effluent 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, DWQ Form AT-1 (original) is to be sent to the following address:
Attention: Environmental Sciences Branch• =..
North Carolina Division of
Water Quality
4401 Reedy Creek Road
Raleigh, North Carolina 27607
Jest 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 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
Branch at the address cited above.
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 the permittee fail to monitor during a month in which toxicity monitoring is required, 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
Water Quality 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, 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.
QCL P/F Version 9/96

State of North Carolina
Department of Environment,
Health and Natural Resources
Division of Water Quality
James B. Hunt, Jr., Governor
Jonathan B. Howes, Secretary
A. Preston Howard, Jr., P.E., Director
March 13, 1997
Mr. Donald E. Carmichael, P.E.
City of Gastonia
Post Office Box 1748
Gastonia, North Carolina 28053-1748
Subject: NPDES Permit Error Correction
NPDES Permit No. NC0074268
Crowders Creek WWTP
Gaston County
Dear Mr. Carmichael:
On February 26, 1997 the Division of Water Quality issued NPDES Permit No. NC0074268 to City
of Gastonia Crowders Creek WWTP. As noted by Ms. Nancy Matherly, a review of the permit file has
indicated that the incorrect sample type was specified for toluene which should be collected as a grab
sample, not as a composite. Accordingly, we are forwarding the modification to correct the error.
Please fmd enclosed the modified section of the permit referenced in the first paragraph. Replace the
original section in your permit with the newer enclosed section and discard the original section. All other
terms and conditions contained in the original permit remain unchanged and in full effect. This permit
modification is issued pursuant to the requirements of North Carolina General Statutes 143-215.1 and the
Memorandum of Agreement between North Carolina and the U. S. Environmental Protection Agency.
If any parts, measurement frequencies or sampling requirements contained in this permit modification
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, Post Office Drawer 27447, Raleigh, North Carolina 27611-7447. Unless such
demand is made, this decision shall be final and binding.
If you have any questions concerning this permit modification please contact Paul B. Clark at
telephone number [phone], extension 580.
Sincerely,
A. Preston Howard, Jr., P.E.
cc. Central Files
Wilmington Regional Office, Water Quality Section
Permits and Engineering Unit
Facility Assessment Unit
Aquatic Survey and Toxicology Unit
Ms. Nancy Matherly, City of Gastonia - Pretreatment Coordinator
P.O. Box 29535, Raleigh, North Carolina 27626-0535 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer 50% recycled/ 10% post -consumer paper

A (1). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
Permit No. NC0074268
During the period beginning on the effective date of the permit and lasting until expiration, the Permittee is authorized to discharge from outfall(s) serial number
001. Such discharges shall be limited and monitored by the Permittee as specified below:
Flow
lonEhty, ,..;...:
vera a e
6.0 MGD
m
,.e
�e
m±
n
Continuous
U
Recording
iREME
I or E
BOD, 5-day, 20°C2
13.0 mg/1
19.5 mg/I
Daily
Composite
E,I
TSS2
30.0 mg/1
45.0 mg/I
Daily
Composite
E, I
NH3-N, (April 1 - October 31)
2.0 mg/1
Daily
Composite
E
NH3-N, (November 1 - March 31)
10.0 mg/1
Daily
Composite
E
Dissolved Oxygen3
Daily
Grab
E,U,D
Fecal Coliform (geometric mean)
Temperature
200/100 ml
400/100 ml
Daily
Daily
Grab
Grab
E
E,U,D
Total Residual Chlorine
28.0 ug/I
Daily
Grab
E
Conductivity
Total Nitrogen (No2+ No3+ TKN) (April 1- Oct 31)
6.0 mg/I 4
3/week
Weekly
Grab
Composite
U,D
E
Total Nitrogen (NO2+No3+TKN) (Nov 1 - March 31)
Weekly
Composite
Total Phosphorus
1.0 mg/I 4
Weekly
Composite
Chronic Toxicity 5
Quarterly
Composite
Cadmium
ug/I
12.2 ug/I
Weekly
Composite
Chromium
122 ug/I
486 ug/I
Weekly
Composite
Cyanide
12.2 ug/I
53.5 ug/I
Weekly
Grab
Lead
- 60.8 ug/I
82.2 ug/I
Weekly
Composite
Mercury
- 0.029 ug/I
0.116 ug/I
Weekly
Grab
Selenium
12.2 ug/I
48.7 ug/I
Weekly
Composite
Toluene
2/month
Grab
Notes:
1 Sample locations: E - Effluent, I - Influent, U -, Upstream at NCSR 1108, D - Downstream at a) NCSR 2424 and b) NCSR 564. Instream
monitoring shall be grab samples taken 3/wk (Jun -Sep) and 1/wk (Oct -May).
2 The monthly average effluent BOD5 and Total Suspended Solids concentrations shall not exceed 15% of the respective influent value (85% removal).
3 The daily average dissolved oxygen effluent concentration shall not be less than 6.0 mg/I.
4 TN and TP limits become effective September 1, 2001.
5 Chronic Toxicity (Ceriodaphnia), P/F, 41 %; March, June, September, and December; See Supplement to Effluent Limitations and Monitoring
Requirements Page - Special Conditions for flow of 6.0 MGD.
The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units and shall be monitored daily at the effluent by grab sample.
There shall be no discharge of floating solids or visible foam in other than trace amounts.

DEPARTMENT OF
PUBLIC WORKS AND UTILITIES
February 2, 2000
Olitg of (ts#nxnra
P. O. BOX 1748
FER 9 2000
6a$#unitt, urflj QIttrulintt.28053-1748
^'O4i1T SOURCE BRANCH
A wow'
Mr. David Goodrich
NPDES Permit Group
Division of Water Quality
North Carolina Department of Environment and Natural Resources
P.O. Box 29535
512 North Salisbury Street
Raleigh, NC 27626-0535
r ryr:nt1
V
A*4'
Subject: Application for Permit to Discharge Wastewater, Standard Form A
Request for Renewal of NPDES NC0074268
City of Gastonia, Crowders Wastewater Treatment Plant (WWTP)
Dear Mr. Goodrich:
Enclosed please find three copies of a technical memorandum supporting the Crowders Creek
Wastewater Treatment Plant (WWTP) NPDES permit renewal application for NPDES NC0074268.
The permit renewal application (Standard Form A - Municipal) is included as Appendix A to the
technical memorandum. A renewal fee has not been enclosed, as it is our understanding that as of
January 1, 1999, renewal fees will be included in the annual fee bill.
The Crowders Creek WWTP is currently under design for minor upgrades in order to enhance
nutrient removal capability and comply with limitations for Total Phosphorus and Total Nitrogen.
The modifications are expected to be completed by the Spring of 2001.
This permit application and supporting material continues the City of Gastonia's extensive efforts for
maintaining environmental compliance in an efficient,and cost-effective manner.

We have continued our efforts to produce the highest quality analytical information for evaluating.
compliance and have begun several new initiatives to address potential sources of contaminants to our
system. Please let me know if you have any questions or need additional information.
Sincerely,
z/7%D
Coleman Keeter, Superintendent WWTD
Wastewater Treatment Division
Enclosures: Three copies of Technical Memorandum
(Standard Form A — Municipal is provided in Appendix A)
cc: Larry Cummings
Bill Kreutzberger/CH2M HILL

TECHNICAL MEMORANDUM CH2MHILL
NPDES Permit Application for the Crowders Creek
Wastewater Treatment Plant
PREPARED FOR:
PREPARED BY:
DATE:
Purpose
City of Gastonia
CH2M HILL
January 31, 2000
The purpose of this technical memorandum (TM) is to provide additional background
information, data analysis, and recommendations for the development of NPDES permit
limitations and monitoring requirements for the City of Gastonia's Crowders Creek
Wastewater Treatment Plant (WWTP). This TM supplements the information contained in
the NPDES application form (Form A — Municipal) which is included as Appendix A of this
document.
Background Information
The Crowders Creek WWTP is an advanced treatment facility serving the southwestern
portions of the City of Gastonia Service area. The facility treats wastewater for
approximately 42,000 people, 9 major industrial contributors, and numerous small
businesses and commercial enterprises.
In addition to providing capacity for growth in and around the City of Gastonia, the
Crowders Creek WW'IP also receives wastewater for the City of Clover, SC and East. Kings
Mountain.
Historically, the Crowders Creek WWTP has had some NPDES compliance issues with
limitations for specific pollutant parameters for toxic substances. Considerable efforts were
made since 1995 through the pretreatment program, and improved sampling and analytical
procedures to address these compliance issues. There were also some reductions in some
industrial contributors to the system since 1995. In response to the efforts to control
toxicants and information submitted to the Division of Water Quality (DWQ), the NPDES
permit for Crowders Creek WWTP was modified in November, 1998 eliminating limitations
for several parameters and modifying the basis for determining compliance with others.
(specifically cyanide and mercury). The City has been participating in the Common Sense
Initiative through the Pollution Prevention (PP) program within the Department of
Environment and Natural Resources (DENR). Through this initiative, the City has been
obtaining voluntary agreements with industries, particularly metal finishers, to reduce their
waste contributions to the City's wastewater facilities.
The City of Gastonia is committed to environmental excellence through their wastewater
services operations. As a demonstration of this commitment, the City is working on a pilot
CROWDERS_NPDES TM_FINALDOC 1 155551.A1.01

NPDES PERMIT APPLICATION FOR THE CROWDERS CREEK WASTEWATER TREATMENT PLANT
project in conjunction with the PP program within the DENR to develop an ISO 14001
Environmental Management System (EMS). The City believes that implementation of the
EMS, will greatly enhance compliance with environmental regulations. A summary of the
City's efforts regarding attainment of the ISO 14001 standard is included in Appendix B. It is
expected that the City will complete this pilot project during the late spring or early summer
of 2000.
Effluent Data Analysis
Available data since January 1, 1997 has been reviewed for various groups of pollutant
parameters. Parameters have been grouped according to the following categories:
• Oxygen demand
• Nutrients
• Toxic Substances
Oxygen Demand
Data Summary
Table 1 is a summary of effluent BOD and ammonia -nitrogen (NH3-N) data from January
1997 through October 1999.
TABLE 1
Summary of BOD and Ammonia Data
Crowders Creek WWTP
Parameter Number of Data Average2 Maximum Minimum Detected
Points' (mg/L) Detected Level Level
(mg/L) (mg/L)
BOD5 694 2.88 19.6 <2.0
BOD5 (summer) 433 2.50 19.6 <2.0
BOD5 (winter) 261 3.50 12.3 <2.0
NH3-N 711 0.32 9.8 <0.1
NH3-N (summer) 444 0.31 9.8 <0.1
NH3-N (winter) 267 0.34 1.75 <0.1
1. Data is from January 1, 1997 — October 28, 1999 (summer = April 1 — October 31, winter= November 1 —
March 31)
2. Average concentration calculated based on assumption that ND=0.
CROWDERS_NPDES TM_FINALDOC
2 152907.A0.01

NPDES PERMIT APPLICATION FOR THE CROWDERS CREEK WASTEWATER TREATMENT PLANT
Proposed Permit Limitations
The permit limitations for BOD5 (13.6 mg/L monthly average, 19.5 mg/L weekly average)
and NIA-N (2.0 mg/L summer monthly average, 10.0 mg/L winter monthly average) are
based on a wasteload allocation conducted by DWQ that was the basis for the expansion
design. It is not anticipated that these requirements will change from the current permit.
Toxic Substances
Data Summary
Maximum expected concentration (MEC) values were calculated for effluent metals,
cyanide, and chloroform for the period of January 1,1997, through October 28,1999. MEC
calculations for the 99th percentile were based on Chapter 3 and Appendix E of EPA's
Technical Support Document for Water Quality -Based Toxics Control (EPA, 1991). DWQ has
indicated that it generally prefers to use the Chapter 3 approach. CH2M HILL feels that
Chapter 3 just approximates the MEC and that the Appendix E method is more rigorous
and accurate. Appendix C provides a summary of the MEC analysis. Potential effluent
limits were developed for metals, cyanide, and chloroform, based on NC water quality
standards or action levels or EPA water quality criteria using the instream waste
concentration (1WC). These values were compared to the 99th percentile MEC values to
determine whether an effluent limitation should be considered as follows:
Potential effluent limit = NC WQS or EPA criterion/IWC
For aquatic life protection and human health criteria for non -carcinogens, the. IWC is based
on the 7-day, 10-year (7Q10) low flow. For human health criteria for carcinogens, the IWC is
based on the average annual flow.
Table 2 summarizes the effluent data, estimated MEC values, and current/potential effluent
limits for toxicants for which Gastonia has monitoring data.
MEC values were compared with the current permit limits and potential effluent limits to
determine if there is reasonable potential to exceed the permit limit or action level. If the
permit limit or action level is greater than the 99th percentile MEC, it is not likely that the
effluent will exceed the permit limit or action level. An MEC value exceeding Action Levels
does not warrant the consideration of a permit limit if effluent is meeting whole effluent
toxicity requirements. The Crowders Creek WWTP effluent has met the toxicity
requirements required for the 6 MGD facility discharging to Crowders Creek (IWC - 41%)
since March 1997.
The MEC analysis indicates that permit limitations should only be considered for cyanide,
mercury, and selenium. For all other parameters, the MEC analysis does not indicate
limitations are required. The recommendations are consistent using either the Chapter 3 or
Appendix E methodology.
CROWDERS_NPDES TM_FINALDOC
3 152907.A0.01

NPDES PERMIT APPLICATION FOR THE CROWDERS CREEK WASTEWATER TREATMENT PLANT
TABLE 2
Maximum Expected Concentrations Compared to Potential Effluent Limits
Crowders Creek WWTP
Compound Monitoring Number Average Maximum MEC - MEC - Potential Limit
Frequency of Data Detect Appendix Chapter 3 Effluent Needed
Points E (99th (99th Limits3
percentile) percentile)2
Cyanide's Weekly5 178 6.13 125 22.9 41.8 12.2 Yes
Cadmium 2/months 120 0.99 2 1.5 2.3 4.9 No
Chromium 2/months 119 4.78 32 19.6 52.8 122.0 No
Nickel Monthlys 43 13.0 59 55.2 138.0 214.6 No
Lead 2/months - 120 1.99 22, 12.7 39.4 _ 61.0 No
Mercury 2/months 111 0.10 0.3 0.2 0.3 0.029 Yes
Silver Monthlys 37 1.86 11 16.3 35.7 0.146 (AL) No (AL)
Arsenic Monthlys 20 1.6 2 2.0 5.7 122.0 No
Molybdenum Monthlys 19 5.52 12 16.0 26.3 No
Selenium Weekly's 144 1.18 10 17.7 14.1 12.2 Yes
Toluene 2/months 64 1.83 5 13.4 7.5 26.8 No
Copper Monthlys 36 23.7 170 78.2 565.4 17.1 (AL) No (AL)
Zinc Monthlys 36 81.2 350 199.8 705.5 122.0 (AL) No (AL)
Data from January 1, 1997 - October 28, 1999 Units in ug/L
ND = non -detect
AL = Action Level per 15A NCAC 2B .0211 (4)
1. Average concentration calculated based on assumption that ND=0.5`detection limit
2. MEC calculated based on assumption that ND = 0.5`detection limit
3. Current permit effluent limits are indicated by bold italics
4. Outlier of 125 ug/L eliminated from dataset.
5. Monitoring requirements as per Permit No. NC0074268
6. Long term monitoring
It should be noted that mercury was only detected in 3 of the 111 data points. In the last
year (October 27,1998 through October 28, 1999), mercury has been reported at the
detection limit (0.2 ug/L) in 1 sample (December 3, 1998) or slightly above the detection
limit (0.3 ug/L) in one sample (July 13, 1999) and was not detected in the remainder of the
samples during this period. Extensive efforts by City of Gastonia staff to ensure high
quality mercury analytical results seem to have reduced the occurrence of detections near
the detection limit. In addition, Gastonia staff has been extending control efforts for mercury
beyond the Pretreatment Program for industrial contributors by initiating an education
effort through the local dental association.
Cyanide results also show a relatively low frequency of detections. Only 13 values out of 77
duringthe last year exceeded the quantitation level of 10 ug/L included in the last NPDES
permit, and only one value exceeded the current NPDES daily maximum limitation of 53.5
ug/L (March 3, 1999 -125 ug/L).
CROWDERS_NPDES TM_FINALDOC
4 152907.A0.01

NPDES PERMIT APPLICATION FOR THE CROWDERS CREEK WASTEWATER TREATMENT PLANT
In addition to the toxicants listed above, the Crowders Creek WWTP presently has an
NPDES permit limit for total residual chlorine (TRC) of 28 ug/L expressed as a daily
maximum value based on grab samples results. Instantaneous measurements of TRC have,
on a few occasions, exceeded the permit requirement.
Proposed Permit Limitations and Monitoring Requirements
Permit limitations for cyanide seem to be justified based on the MEC analysis. These
limitations should be the same as in the current NPDES permit.
While the MEC analysis indicates a need for a mercury limitation, the nature of the mercury
detections should be considered in the decision to include a permit limitation. Because the
mercury detection level is about six times higher than the potential permit limit, any
detections of mercury result in a MEC value greater than the potential permit limit. Since
mercury was detected in only 3 samples during the three years, a permit limitation does not
seem warranted. If a permit limitation is determined to be necessary, it is requested that
DWQ reconsider a recommendation from the May 13,1997 letter from the City of Gastonia
to Dave Goodrich/DWQ regarding mercury requirements. This recommendation was as
follows:
Mercury compliance is dependent on test results near the detection level. The
permits should be modified to allow for mercury samples to be collected with grab
samples at all facilities. A footnote could be added to the permit that allows detected
mercury levels to be verified through clean analysis of true split samples. This could
eliminate many compliance issues with this parameter.
The grab sample recommendation was included in the reissued permit and the other issues
were not addressed because a limitation for mercury was determined not to be necessary.
The TRC value of 28 ug/L is based on EPA acute water quality criteria similar to other
toxicants; however, TRC must be measured in grab samples according to EPA protocols.
Other toxicants are measured in 24-hour composite samples. It is requested that the permit
limitation be expressed as a daily average value so that multiple grab results can be
averaged during a day to judge compliance.
Nutrients
Data Summary
Table 3 summarizes total nitrogen (TN) and total phosphorus (TP) data for the effluent. The
low TP results reflect the existing processes for phosphorus removal at the facility.
CROWDERS NPDES TM_FINALDOC
5 152907.A0.01

NPDES PERMIT APPLICATION FOR THE CROWDERS CREEK WASTEWATER TREATMENT PLANT
TABLE 3
Summary of Total Nitrogen and Total Phosphorus Data
Crowders Creek WWTP
Parameter Number of Data Average' Maximum Detect Minimum Detect
Points
Total Nitrogen 178 13.6 178 2.13
Total Phosphorus 181 1.50 14.4 0.4
Data from January 1, 1997 - October 28, 1999
Units in mg/L
1. Average concentration calculated based on assumption that ND=0
Proposed Permit Limitations
The current NPDES permit includes a concentration limit for TN during the summer (April
through October) of 6 mg/L beginning in September 2001. The TP limit of 1.0 mg/L applies
year-round and also becomes effective in September 2001.
CH2M HILL recommends that only mass limits be included in the reissued NPDES permit.
These would be a 300-lbs/day TN limit during the summer and a 50 lbs/day TP limit year
round. The basis for nutrient limitations for the Long Creek WWTP is based on mass
loading to the Lake Wylie system. Effluent concentrations are not critical.
Planned Modifications
Modifications are planned for the existing Crowders Creek facility, upgrading the treatment
process for the purpose of achieving enhanced nutrient removal. New anoxic zones are
being created within the existing aeration tanks for the purposes of accomplishing
denitrification. The influent wastewater will be fed in a step feed configuration, with
capabilities to distribute the primary clarifier effluent to up to four places in each of the two
treatment trains. The existing aeration system is being upgraded from a fine bubble
membrane tube diffuser system to a full -floor coverage fine bubble membrane disc system,
for the purposes of improving oxygen transfer efficiency. A dissolved oxygen control
system is being installed to reduce operational costs to the facility. As an alternate portion
of the project, a nitrate recycle pumping system may be installed, pending cost
considerations, to reduce effluent nitrate concentrations. The upgrade will provide the
facility with increased operational flexibility and will promote lower nutrient discharges.
Finally, the project includes minor modifications to the sludge pumping system. These
planned modifications are expected to be completed by Spring of 2001.
CROWDERS_NPDES TM-FINAL.DOC
6 152907.A0.01.

NPDES PERMIT APPLICATION FOR THE CROWDERS CREEK WASTEWATER TREATMENT PLANT
Conclusions/Recommendations
Proposed Permit Limitations and Monitoring Requirements
Table 4 presents a proposed permit limitations page for the Crowders Creek WWTP. This
page included the changes recommended above for toxic substances and nutrients.
These changes reflect a thorough analysis of recent Crowders Creek WWTP data and
appropriate interpretation of requirements necessary to protect water quality in the
Catawba River.
ISO 14001 Pilot Project
Discussions with DWQ staff have indicated that they were willing to consider additional
NPDES permit changes upon successful completion of the ISO 14001 pilot project. The
following are some potential changes that should be considered:
• Reductions in effluent toxicity testing monitoring frequency to semi-annual or
annual monitoring
• Reductions in conventional parameter monitoring frequency
CROWDERS_NPDES TM_FINALDOC
7 152907.A0.01

TABLE 4
Potential Effluent Limitations and Monitoring Requirements -Permitted Discharge to Crowders Creek
Effluent Characteristics
LIMITS MONITORING REQUIREMENTS
Monthly Weekly Daily Measurement Sample Type Sample
Average Average Maximum Frequency Location'
Flow 6.0 MGD Continuous Recording I or E
BOD, 5-day, 20°C2 13.0 mg/L 19.5 mg/L Daily Composite E, I
TSS2 30.0 mg/L 45.0 mg/L Daily Composite E, I
NH3-N (April 1 — October 31) 2.0 mg/L Daily Composite E
NH3-N (November 1 — March 31) 10.0 mg/L Daily Composite E
Dissolved Oxygen3 Daily Grab E, U, .D
Fecal Coliform (geometric mean) 200/100 mL 400/100 mL Daily Grab E
Temperature Daily Grab E, U, D
Total Residual Chlorine 28.0 ug/L8 Daily Grab E
Conductivity 3/week Grab U, D
Total Nitrogen (NO2 + NO3 + TKN) (April 1 — 300 Ibs/day4 Weekly Composite E
Oct 31)
Total Nitrogen (NO2 + NO3 + TKN) (Nov 1 — Weekly Composite E
March 31)
Total Phosphorus 50 Ibs/day4 Weekly Composite E
Chronic Toxicity5 Quarterly Composite E
Cadmium 2/month Composite E
Chromium 2/month Composite E
Cyanides 12.2 ug/L 53.5 ug/L Weekly Grab E
Lead 2/month Composite E
CROWDERS_NPDES TM_FINALDOC 8 155551.A1.01

NPDES PERMIT APPLICATION FOR THE CROWDERS CREEK WASTEWATER TREATh,.......ANT
TABLE 4
Potential Effluent Limitations and Monitoring Requirements -Permitted Discharge to Crowders Creek
Effluent Characteristics
LIMITS MONITORING REQUIREMENTS
Monthly Weekly Daily Measurement Sample Type Sample
Average Average Maximum Frequency Location'
Mercury' 2/month Grab
Selenium 12.2 ug/L 48.7 ug/L Weekly Composite
Toluene 2/month Grab
1. Sample Locations: E effluent, I — influent, U — Upstream at NCSR 1108, D — Downstream at a) NCSR 2424 and b) NCSR 564. Instream monitoring shall be
grab samples taken 3/wk (Jun -Sep) and 1/wk (Oct -May).
2. The monthly average effluent BOD5 and Total Suspended Solids concentrations shall not exceed 15% of the respective influent value (85% removal).
3. The daily average dissolved oxygen effluent concentration shall not be less than 6.0 mg/L
4. TN and TP limits become effective September 1, 2001.
5. Chronic Toxicity (Ceriodaphnia), P/F, 41%: March, June, September, and December; See Supplement to Effluent Limitations and Monitoring Requirements
Page — Special Conditions for flow of 6.0 MGD.
6. The detection limit for cyanide is 10.0 ug/L. If the measured levels of cyanide are below the detection limit, then the measurement is considered to be zero for
purposes of compliance evaluation and should be reported on the DMR as <10.0 ug/L. The pH shall not be less than 6.0 standard units nor greater than 9.0
standard units and shall be monitored at the effluent by grab sample.
7. The detection limit for mercury is 0.2 ug/L. If the measured levels of mercury are below the detection limit, then the measurement is considered to be zero for
purposes of compliance evaluation and should be reported on the DMR as <0.2 ug/L. If mercury is detected in any sample, the presence of mercury can be
verified using a separate split sample analyzed in accordance with EPA Method 1631. The result from this second analysis shall be used for compliance
determinations.
8. The TRC permit limitation is a daily average value.
There shall be no discharge of floating solids or visible foam in other than trace amounts.
CROWDERS NPDES TM_FINALDOC 9 152907.A0.01

City of Gastonia
Crowders Creek WWTP NC0074268
Sludge Management Plan
The Crowders Creek WWTP design for sludge handling currently consists of anaerobic
sludge digestion followed by land application. This plan describes both the current and
planned future sludge management operations at the Crowders Creek WWTP.
Anaerobic Digestion
Currently, the anaerobic digestion system consists of four anaerobic sludge digesters, each
with a volume of approximately 466,000 gallons, which treat the primary and waste -
activated sludge from the WWTP. On average, the City of Gastonia sends 23,000 gallons of
raw and wasted solids to these digesters each day for treatment. One of the digesters is
operated as a primary digester, two are operated as secondary digesters, and one is utilized
for sludge storage.
Raw sludge from the bottom of two primary clarifiers is pumped to the primary digester
where it is held for a minimum of 15 days at 35 degrees C. As sludge is pumped to the
primary digester, a similar volume is pumped to the secondary digester(s). The sludge is
eventually stored in the open top holding digester.
In 1994-5, the City of Gastonia constructed a residuals storage facility at the City of Gastonia
Resource Recovery Farm located between Dallas and Cherryville. This facility is capable of
storing an additional eight (8) million gallons of biosolids when application activities are
hindered by inclement weather.
The Crowders Creek WWTP currently complies with the 503 pathogen reduction
requirement for Class B biosolids by maintaining a PSRP process (40 CFR Part 257
Appendix II). Pathogen reduction is demonstrated by fecal coliform testing or
documentation of daily primary digester SRT and temperature. Vector attraction reduction
is demonstrated by either a measurement of 38% volatile solids reduction or a 40 day
additional anaerobic digestion bench scale test.
Land Application
Currently, all biosolids are land applied to 2173.3 acres of local farmland located throughout
Gaston County, in accordance with NCDENR Land Application Permit WQ0001793. This
work is currently contracted out to Synagro of Clemmons, NC.
CROWDERS SLUDGE_MGT_PLAN.DOC 1

1000 2000 FEET
Gastonia South, NC
NW/4 Clover 15' Quadrangle
N3507.5-W8107.5/7.5
1973 AMS 4754 II NW -Series V842
City of Gastonia NC 0074268
Crowders Creek VVWTP Location Map
Gastonia, NC November 1999
CH2MHILL
P:1GASTONIA\CRO W DERW WTPAPR

ALKALINITY
CONTROL
PRELIMINARY
TREATMENT
T� :
4;CHEMICA4
CHEMICAL
CITY OF GASTONIA NC 0074268
SCHEMATIC OF WASTEWATER FLOW
CROWDERS CREEK WWTP
GASTONIA, NC JANUARY, 2000
SUPERNATANT.:.....
.. '..;SLUDGE
SUPERNATANT ..,
CHEMICAL:..
• ,CHEMICALt XERAND,CLARIPIER;;;
t:
CHLORINATION
DECHLORINATION
CH2MHILL

•
STANDARD FORM A - MUNICIPAL
SECTION IV. INDUSTRIAL WASTE CONTRIBUTION TO MUNICIPAL SYSTEM
Submit a description of each major industrial facility discharging to the municipal system, using a separate Section IV for each
facility description. Indicate the 4 digit Standard Industrial Classification (SIC) Code for the industry, the major product or raw
material, the flow (in thousand gallons per day), and the characteristics of the wastewater discharged from the industrial facility
into the municipal system. Consult Table III for standard measures of products or raw materials (See instructions).
1. Major Contributing Facility
(See Instructions)
Name
401a A.B. Carter
P.O. Box 51.8
Number and Street 401 b 4801 York Highway
City 401c Gastonia
County 401d Gaston
State 401e North Carolina
Zip Code 401f 28052
2. Primary Standard Industrial 402 3552, 3568, 3315, 3451, 3469, 3544
Classification Code.
(See Instructions)
3. Principal Product or Raw Material Quantity Units
(See Instructions)
Product 403a steel/nylon travelers 403c 403e
steel spinning rings
drawn wire
Raw Material
403b 403d 403f
4. Flow. Indicate the volume of water 404a 17.5 Thousand gallons per day
discharged into the municipal system in
thousand gallons per day and whether 404b _X_ Intermittent (int) Continuous (con)
this discharge is intermittent or continuous
5. Pretreatment Provided. Indicate if 405 _X_ Yes No
pretreatment is provided prior to entering
the municipal system
6. Characteristics of Wastewater
(See Instructions)
Parameter
Name
BOD
TSS
NH3-N
NO2+NO3
Total
Phosphorus
CN
Hg
406a
Parameter
Number
00310
00530
00610
00665
00720
71900
406b
Value
16.5
5
2.08
3.35
3.48
0.00115
0.0001
Parameter
Name
Cd
Pb
Cr
COD
Cu
Ni
Ag
406a
Parameter
Number
01027
01051
01034
00340
01042
01067
01077
406b
Value
0.001
0.008
0.015
43.5
0.08
14.5
0.003

Parameter
Name
Zn
O&G
TTO
As
TKN
Se
Mo —
406a
Parameter
Number
01092
00550
01097
406b
Value
0.0055
3.25
0.325
0.002
1.4
0.016
0.0015

STANDARD FORM A - MUNICIPAL
SECTION IV. INDUSTRIAL WASTE CONTRIBUTION TO MUNICIPAL SYSTEM
Submit a description of each major industrial facility discharging to the municipal system, using a separate Section IV for each
facility description. Indicate the 4 digit Standard Industrial Classification (SIC) Code for the industry, the major product or raw
material, the flow (in thousand gallons per day), and the characteristics of the wastewater discharged from the industrial facility
into the municipal system. Consult Table III for standard measures of products or raw materials (See instructions).
1. Major Contributing Facility
(See Instructions)
Name
401a American & Efird
P.O. Box 759
Number and Street 401b 1002 Jenkins Road
City 401c Gastonia
County 401d Gaston
State 401e North Carolina
Zip Code 401f 28052
2. Primary Standard Industrial 402 2284
Classification Code
(See Instructions)
3. Principal Product or Raw Material Quantity Units
(See Instructions)
Product 403a cotton 403c 403e
polycotton
sewing threads
Raw Material
403b cotton, dyes, 403d
finishes, polyester
403f
4. Flow. Indicate the volume of water 404a 530.5 Thousand gallons per day
discharged into the municipal system in
thousand gallons per day and whether 404b _ Intermittent (int) _X_ Continuous (con)
this discharge is intermittent or continuous
5. Pretreatment Provided. Indicate if 405 _X_ Yes No
pretreatment is provided prior to entering
the municipal system
6. Characteristics of Wastewater
(See Instructions)
Parameter
Name
BOD
TSS
NH3-N
NO2+NO3
Total
Phosphorus
CN
Hg
406a
Parameter
Number
00310
00530
00610
00665
00720
71900
406b
Value
90
25.5
3.58
1.55
2.24
0.0013
0.0001
Parameter
Name
Cd
Pb
Cr
COD
Cu
Ni
Ag
406a
Parameter
Number
01027
01051
01034
00340
01042
01067
01077
406b
Value
0.001
0.001
0.017
295
0.0955
0.0075
0.005

Parameter
Name
Zn
O&G
As
TKN
Se
Mo
406a
Parameter
Number
01092
00550
01097
406b
Value
0.12
19.5
0.002
7.45
0.0015
0.005

STANDARD FORM A - MUNICIPAL
SECTION IV. INDUSTRIAL WASTE CONTRIBUTION TO MUNICIPAL SYSTEM
Submit a description of each major industrial facility discharging to the municipal system, using a separate Section IV for each
facility description. Indicate the 4 digit Standard Industrial Classification (SIC) Code for the industry, the major product or raw
material, the flow (in thousand gallons per day), and the characteristics of the wastewater discharged from the industrial facility
into the municipal system. Consult Table III for standard measures of products or raw materials(Seeinstructions).
1. Major Contributing Facility
(See Instructions)
Name
401a AMP, Inc.
NOTE: FACILITY IS'P. ERMA'NENTLY CLOSING'=IN 12/99
Number and Street 401b 1260 Shannon Bradley Road
City 401 c Gastonia
County 401d Gaston
State 401e North Carolina
Zip Code 401f 28057
2. Primary Standard Industrial 402 3678
Classification Code
(See Instructions)
3. Principal Product or Raw Material Quantity Units
(See Instructions)
Product
Raw Material
403a Electroplated 403c 403e
Conductors
403b 403d 403f
4. Flow. Indicate the volume of water 404a 8.5 Thousand gallons per day
discharged into the municipal system in
thousand gallons per day and whether 404b Intermittent (int) _X_ Continuous (con)
this discharge is intermittent or continuous
5. Pretreatment Provided. Indicate if 405 _X_ Yes No
pretreatment is provided prior to entering
the municipal system
6. Characteristics of Wastewater
(See Instructions)
Parameter
Name
BOD
TSS
NH3-N
NO2+NO3
Total
Phosphorus
CN•
Hg
406a
Parameter
Number
00310
00530
00610
00665
00720
71900
406b
Value
59
7.5
0.375
3
0.65
0.2215
0.0001
Parameter
Name
Cd
Pb
Cr
COD
Cu
Ni .
Ag
406a
Parameter
Number
01027
01051
01034
00340
01042
01067
01077
406b
Value
0.001
0.011
0.0345
101.5
0.223
0.355
0.009

Parameter
Name
Zn
O&G
As
TKN
Se
Mo
TTO
406a
Parameter
Number
01092
00550
01097
406b
Value
0.118
5
0.001
12.7
0.003
0.005
0.656

STANDARD FORM A - MUNICIPAL
SECTION IV. INDUSTRIAL WASTE CONTRIBUTION TO MUNICIPAL SYSTEM
Submit a description of each major industrial facility discharging to the municipal system, using a separate Section IV for each
facility description. Indicate the 4 digit Standard Industrial Classification (SIC) Code for the industry, the major product or raw
material, the flow (in thousand gallons per day), and the characteristics of the wastewater discharged from the industrial facility
into the municipal system. Consult Table III for standard measures of products or raw materials (See instructions).
1. Major Contributing Facility
(See Instructions)
Name
401a BF Goodrich
Number and Street 401 b 207 Telegraph Drive
City 401c Gastonia
County 401 d Gaston
State 401 a North Carolina
Zip Code 401f 28056
2. Primary Standard Industrial 402 2821, 2899
Classification Code
(See Instructions)
3. Principal Product or Raw Material Quantity Units
(See Instructions)
Product 403a latex resins 403c 403e
and coatings
Raw Material
403b 403d403f
4. Flow. Indicate the volume of water 404a 21.5 Thousand gallons per day
discharged into the municipal system in
thousand gallons per day and whether 404b _X_ Intermittent (int) Continuous (con)
this discharge is intermittent or continuous
5. Pretreatment Provided. Indicate if 405 _X_ Yes No
pretreatment is provided prior to entering
the municipal system
6. Characteristics of Wastewater
(See Instructions)
Parameter
Name
BOD
TSS
NH3-N
NO2+NO3
Total
Phosphorus
CN
Hg
406a
Parameter
Number
00310
00530
00610
00665
00720
71900
406b
Value
42.5
28.5
118.5
7.37
2.29
0.0035
Ibs/day
<0.0002
Parameter
Name
Cd
Pb
Cr
COD
Cu
Ni
Ag
406a
Parameter
Number
01027
01051
01034
00340
01042
01067
01077
406b
Value
0.002
0.00045
Ibs/day
0.046
1174.5
0.635
0.43
0.018

Parameter
Name
Zn
O&G
As
TKN
Se
Mo
406a
Parameter
Number
01092
00550
01097
406b
Value
0.2515
Ibs/day
8
0.0025
273
0.001
0.035

STANDARD FORM A - MUNICIPAL
SECTION IV. INDUSTRIAL WASTE CONTRIBUTION TO MUNICIPAL SYSTEM
Submit a description of each major industrial facility discharging to the municipal system, using a separate Section IV for each
facility description. Indicate the 4 digit Standard Industrial Classification (SIC) Code for the industry, the major product or raw
material, the flow (in thousand gallons per day), and the characteristics of the wastewater discharged from the industrial facility
into the municipal system. Consult Table III for standard measures of products or raw materials (See instructions).
1. Major Contributing Facility
(See Instructions)
Name
401a CBP Resources 002
Number and Street 401 b 5533 South York Road
City 401c Gastonia
County 401 d Gaston
State 401e North Carolina
Zip Code 401f 28052
2. Primary Standard Industrial 402 2077
Classification Code
(See Instructions)
3. Principal Product or Raw Material Quantity Units
(See Instructions)
Product
Raw Material
403a protein and fat 403c 403e
403b meat, bones, feathers, 403d 403f
blood, used cooking oil
4. Flow. Indicate the volume of water 404a 192 Thousand gallons per day
discharged into the municipal system in
thousand gallons per day and whether 404b _ Intermittent (int) _X_ Continuous (con)
this discharge is intermittent or continuous
5. Pretreatment Provided. Indicate if 405 _X_ Yes No
pretreatment is provided prior to entering
the municipal system
6. Characteristics of Wastewater
(See Instructions)
Parameter
Name
BOD
TSS
NHs-N
Total
Phosphorus
COD
O&G
406a
Parameter
Number
00310
00530
00610
00665
00340
00550
406b
Value
53
208
19
28
228
2.5

STANDARD FORM A - MUNICIPAL
SECTION IV. INDUSTRIAL WASTE CONTRIBUTION TO MUNICIPAL SYSTEM
Submit a description of each major industrial facility discharging to the municipal system, using a separate Section IV for each
facility description. Indicate the 4 digit Standard Industrial Classification (SIC) Code for the industry, the major product or raw
material, the flow (in thousand gallons per day), and the characteristics of the wastewater discharged from the industrial facility
into the municipal system. Consult Table III for standard measures of products or raw materials (See instructions).
1. Major Contributing Facility 401a Clover
(See Instructions)
Name
Number and Street 401 b 114 Bethel Street
City 401 c Clover
County 401d York
State 401e South Carolina
Zip Code 401f 29710
2. Primary Standard Industrial 402
Classification Code
(See Instructions)
3. Principal Product or Raw Material Quantity Units
(See Instructions)
Product 403a Domestic raw sewage 403c 403e
Raw Material
403b Domestic waste 403d 403f
4. Flow. Indicate the volume of water 404a 556 Thousand gallons per day
discharged into the municipal system in
thousand gallons per day and whether 404b Intermittent (int) _X_ Continuous (con)
this discharge is intermittent or continuous
5. Pretreatment Provided. Indicate if 405 Yes _X_ No
pretreatment is provided prior to entering
the municipal system
6. Characteristics of Wastewater
(See Instructions)
Parameter
Name
BOD
TSS
NH3-N
NO2+NO3
Total
Phosphorus
CN
Hg
406a
Parameter
Number
00310
00530
00610
00665
00720
71900
406b
Value
108
137.5
18.05
7.48
4.605
0.0013
0.0001
Parameter
Name
Cd
Pb
Cr
COD
Cu
Ni
Ag
406a
Parameter
Number
01027
01051
01034
00340
01042
01067
01077
406b
Value
0.001
0.005
0.029
282.5
0.074
0.033
0.005

Parameter
Name
Zn
O&G
As
TKN
Se
Mo
406a
Parameter
Number
01092
00550
01097
406b
Value
0.221
5.75
0.001
13.3
0.001
0.005

STANDARD FORM A - MUNICIPAL
SECTION IV.. INDUSTRIAL WASTE CONTRIBUTION TO MUNICIPAL SYSTEM
Submit a description of each major industrial facility discharging to the municipal system, using a separate Section IV for each
facility description. Indicate the 4 digit Standard Industrial Classification (SIC) Code for the industry, the major product or raw
material, the flow (in thousand gallons per day), and the characteristics of the wastewater discharged from the industrial facility
into the municipal system. Consult Table III for standard measures of products or raw materials (See instructions).
1. Major Contributing Facility
(See Instructions)
Name
401a Kings Mountain
Post Office Box 429
Number and Street 401 b 1013 North Piedmont Avenue
City 401c Gastonia
County 401d Gaston
State 401e North Carolina
Zip Code 401f 28086
2. Primary Standard Industrial 402 2369
Classification Code
(See Instructions)
3. Principal Product or Raw Material Quantity Units
(See Instructions)
Product 403a Textile/Domestic 403c 403e
Raw Material
403b 403d 403f
4. Flow. Indicate the volume of water 404a 1524.5 Thousand gallons per day
discharged into the municipal system in
thousand gallons per day and whether 404b _ Intermittent (int) _X_ Continuous (con)
this discharge is intermittent or continuous
5. Pretreatment Provided. Indicate if 405 _X_ Yes No
pretreatment is provided prior to entering
the municipal system
6. Characteristics of Wastewater
(See Instructions)
Parameter
Name
BOD
TSS
NH3-N
NO2+NO3
Total
Phosphorus
CN
lig
406a
Parameter
Number
00310
00530
00610
00665
00720
71900
406b
Value
105
158
4.1
2.35
3.89
0.0013
0.0001
Parameter
Name
Cd
Pb
Cr
COD
Cu
Ni
Ag
406a.
Parameter
Number
01027
01051
01034
00340
01042
01067
01077
406b
Value
0.001
0.0085
0.025
427
0.06
0.035
0.005

Parameter
Name
Zn
O&G
As
TKN
Se
Mo
406a
Parameter
Number
01092
00550
01097
406b
Value
0.194
15
0.002
18.8
0.002
0.01

STANDARD FORM A - MUNICIPAL
SECTION IV. INDUSTRIAL WASTE CONTRIBUTION TO MUNICIPAL SYSTEM
Submit a description of each major industrial facility discharging to the municipal system, using a separate Section IV for each
facility description. Indicate the 4 digit Standard Industrial Classification (SIC) Code for the industry, the major product or raw
material, the flow (in thousand gallons per day), and the characteristics of the wastewater discharged from the industrial facility
into the municipal system. Consult Table III for standard measures of products or raw materials (See instructions).
1. Major Contributing Facility
(See Instructions)
Name
401a Rauch Industries
Post Office Box 609
Number and Street 401 b 6048 South York Road
City 401c Gastonia
County 401 d Gaston
State 401e North Carolina
Zip Code 401f 28052
2. Primary Standard Industrial 402 3231
Classification Code
(See Instructions)
3. Principal Product or Raw Material _ Quantity Units
(See Instructions)
Product 403a Glass and Satin 403c 403e
Ornaments
Raw Material 403b 403d 403f
4. Flow. Indicate the volume of water
discharged into the municipal system in
thousand gallons per day and whether
this discharge is intermittent or continuous
5. Pretreatment Provided. Indicate if
pretreatment is provided prior to entering
the municipal system
6. Characteristics of Wastewater
(See Instructions)
404a 13 Thousand gallons per day
404b _ Intermittent (int) _X_ Continuous (con)
405 _X_ Yes No
Parameter
Name
BOD
TSS
NH3-N
NO2+NO3
Total
Phosphorus
CN
Hg
406a
Parameter
Number
00310
00530
00610
00665
00720
71900
406b
Value
3.5
14
2.75
171
0.355
0.0013
0.00015
Parameter
Name
Cd
Pb
Cr
COD
Cu
Ni
Ag
406a
Parameter
Number
01027
01051
01034
00340
01042
01067
01077
406b
Value
0.001
0.002
0.0285
34
0.0065
0.0055
0.042

Parameter
Name
Zn
O&G
As
TKN
Se
Mo
406a
Parameter
Number
01092
00550
01097
406b
Value
0.0425
2.35
0.001
0.056
0.001
0.005

STANDARD FORM A - MUNICIPAL
SECTION IV. INDUSTRIAL WASTE CONTRIBUTION TO MUNICIPAL SYSTEM
Submit a description of each major industrial facility discharging to the municipal system, using a separate Section IV for each
facility description. Indicate the 4 digit Standard Industrial Classification (SIC) Code for the industry, the major product or raw
material, the flow (in thousand gallons per day), and the characteristics of the wastewater discharged from the industrial facility
into the municipal system. Consult Table III for standard measures of products or raw materials (See instructions).
1. Major Contributing Facility 401a Sunshine Uniform Service
(See Instructions)
Name Post Office Box 12632
Number and Street 401 b Jenkins Road
City 401 c Gastonia
County 401d Gaston
State 401e North Carolina
Zip Code 401f 28052
2. Primary Standard Industrial 402 7218
Classification Code
(See Instructions)
3. Principal Product or Raw Material Quantity Units
(See Instructions)
Product 403a Laundry/Water 403c 403e
Soaps
Raw Material 403b 403d 403f
4. Flow. Indicate the volume of water 404a 40 Thousand gallons per day
discharged into the municipal system in
thousand gallons per day and whether 404b _X_ Intermittent (int) Continuous (con)
this discharge is intermittent or continuous
5. Pretreatment Provided. Indicate if 405 _X_ Yes No
pretreatment is provided prior to entering
the municipal system
6. Characteristics of Wastewater
(See Instructions)
Parameter
Name
BOD
TSS
NH3-N
NO2+NO3
Total
Phosphorus
CN
Hg
406a
Parameter
Number
00310
00530
00610
00665
00720
71900
406b
Value
949.5
421
1.37
36.8
18.25
0.0084
0.0004
Parameter
Name
Cd
Pb
Cr
COD
Cu
Ni
Ag
406a
Parameter
Number
01027
01051
01034
00340
01042
01067
01077
406b
Value
0.0185
0.5835
0.102
2183
0.366
0.08
0.005

Parameter
Name
Zn
O&G
As
TKN
Se
Mo
406a
Parameter
Number
01092
00550
01097
406b
Value
0.961
150
0.005
13.5
0.0015
0.029

Table C-1
Gastonia Crowders Creek WWTP NPDES Permit Application
Data from 1997 through October 1999 Used to Calculate Maximum Expected Concentrator
Cyanide (ug/I) Cadmium (ug/I)
Chromium
(ug/I)
Nickel (ugll) Lead (ug/l)
Mercury
(ug/I)
Molybdenum Selenium
Silver (ugA) Arsenic (ugA) (ug/I) (ug/I)
Toluene (ug/I) Copper (ug/I)
Zinc (ug/I)
30.4
2
32
59
22
0.3
11
2
12
10
5
170
350
23.4
2
29
55
15
0.2
10
2
10
4
2
140
170
22
2
16
35
15
0.2
2
2
6
4
1
44
150
20.2
1
12
30
7
ND
2
2
5
3
1
36
120
17.6
1
12
30
7
ND
ND
2
5
3
1
24
110
17.6
1
7
25
6
ND
ND
ND
4
2.5
1
23.8
100
14.5
1
7
20
6
ND
ND
ND
3.8
2
1
23
96
13.4
1
6
18
5
ND
ND
ND
2
2
1
21
90
12.9
1
6
15
5
ND
ND
ND
ND
2
1
20
90
12
1
6
15
5
ND
ND
ND
ND
2
1
19
86
11.2
1
4.2
13
4
ND
ND
ND
ND
2
1
18
83
10.8
1.
4
13
4
ND
ND
ND
ND
2
1
18
80
10
1
3
12
4
ND
ND
ND
ND
0.01
1
17.6
80
ND
1
3
12
4
ND
ND
ND
ND
0.01
1
16
74
ND
1
3
12
3
ND
ND
ND
ND
ND
1
16
73
ND
1
3
11
3
ND
ND
ND
ND
ND
1
16
73
ND
1
2.5
10.6
3
ND
ND
ND
ND
ND
1
15
70
ND
1
2
10
3
ND
ND
ND
ND
ND
1
14
67
ND
1
2
10
2
ND
ND
ND
ND
ND
1
14
66
ND
1
2
10
2
ND
ND
ND
ND
1
14
65
ND
1
2
10
2
ND
ND
ND
0.5
14
64
ND
1
2
10
2
ND
ND
ND
0.5
14
62
ND
1
2
10
2
ND
ND
ND
0.01
12
61
ND
1
ND
10
2
ND
ND
ND
0.01
12
59
ND
1
ND
9
2
ND
ND
ND
0.01
12
56
ND
1
ND
9
2
ND
ND
ND
ND
11.1
53
ND
1
ND
8
2
ND
ND
ND
ND
11
52
ND
1
ND
8
2
ND
ND
ND
ND
11
52
ND
1
ND
7
2
ND
ND
ND
ND
10
52
ND
1
ND
7
2
ND
ND
ND
ND
10
51
ND
1
ND
6
2
ND
ND
ND
ND
10
50
ND
1
ND
6
2
ND
ND
ND
ND
10
48
ND
1
ND
6
0.5
ND
ND
ND
ND
10
46
ND
1
ND
6
ND
ND
ND
ND
ND
10
43
ND
1
ND
4
ND
ND
ND
ND
ND
9
42
ND
1
ND
4
ND
ND
ND
ND
ND
9
40
ND
ND
ND
4
ND
ND
ND
ND
ND
ND
ND
ND
3.7
ND
ND
ND
ND
ND
ND
ND
2
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
" ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
Crowders_AppendixC_tables.XLS data 01/27/2000
1

Table C-1
Gastonia Crowders Creek WWTP NPDES Permit Application
Data from 1997 through October 1999 Used to Calculate Maximum Expected Concentratior
Chromium
Cyanide (ugA) Cadmium (ug/I) (ugll)
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
Nickel(ugA) Lead (ugll)
Mercury
(ug/I)
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
Molybdenum Selenium
Sliver (ug/1) Arsenic (ug/l) (ug/I) (ugA) Toluene (ugll) Copper (ugA) Zinc (ug/I)
Crowders_AppendixC_tables.XLS data 01/27/2000 2
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
. ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND

Table C-1
Gastonia Crowders Creek WWTP NPDES Permit Application
Data from 1997 through October 1999 Used to Calculate Maximum Expected Concentratior
Cyanide (ug/I) Cadmium (ug/i)
Chromium
(ug/I)
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
Mercury
Nickel (ug/i) Lead (ug/i) (ugA)
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
Molybdenum Selenium
Silver (ug/i) Arsenic (ug/i) (ug/I) (ug/i)
Crowders_4ppendixC_tables.XLS data 01/27/2000 3
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
Toluene (ug/I) Copper (ugA) Zinc (ug/I)
ND
ND
ND

Table C•1
Gastonia Crowders Creek WWTP NPDES Permit Application
Data from 1997 through October 1999 Used to Calculate Maximum Expected Concentrator
Chromium
Cyanide (ugA) Cadmium (ug/I) (ug/I)
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
Mercury
Nickel (ug/l) Lead (ug/i) (ugfl)
Molybdenum Selenium
Sliver (ug/l) Arsenic (ug/I) (ug/I) (ug/I) Toluene (ug/I) Copper (ugll) Zinc (ugll)
Crowders_AppendixC_tables.XLS data 01/27/2000 4
ND
ND
ND

Table C-2
Gastonia Crowders Creek WWTP NPDES Permit Application
Maximum Expected Concentration Calculation using TSD Appendix E Table E2 - Cyanide (ugll)
xi yi=ln(xi) (yi-mu)2
1 30.40 3.41 0.4354
2 23.40 3.15 0.1585
3 22.00 3.09 0.1132
4 20.20 3.01 0.0631
5 17.60 2.87 0.0128
6 17.60 2.87 0.0128
7 14.50 2.67 0.0065
8 13.40 2.60 0.0254
9 12.90 2.56 0.0389
10 12.00 2.48 0.0727
11 11.20 2.42 0.1147
12 10.80 2.38 0.1406
13 10.00 2.30 0.2043
D (detection limit)
k sample size
r (# nondetects)
delta
a2
Ex (avg)
Vx (variance)
Probability level (P)
P adj for non det (P_a)
SQRT(LN (1 /((1-P_a)^2)))
Z_p
10
177
164
0.93
2.755
0.117
10.489
5.536
0.990
0.864
1.997
1.098
Crowders_AppendixC tables.XLS Cyanide_AppE 01/27/2000 1

Table C-3
Gastonia Crowders Creek WWTP NPDES Permit Application
Maximum Expected Concentration Calculation using TSD Appendix E Table E2 - Arsenic (ugll)
xl yi=ln(xi) (yi-mu)2
1 2.00 0.69 0.0000
2 2.00 0.69 0.0000
3 2.00 0.69 0.0000
4 2.00 0.69 0.0000
5 2.00 0.69 0.0000
D (detection limit)
k sample size
r (# nondetects).
delta
a2
Ex (avg)
Vx (variance)
Probability level (P)
P adj for non det (P_a)
SQRT(LN(1 /((1-P_a)^2)))
Z_p
20
20
15
0.75
0.693
0.000
15.500
60.750
0.990
0.960
2.537
1.751
Crowders_AppendixC_tables.XLS Arsenic_AppE 01/27/2000 1

Table C-4
Gastonia Crowders Creek WWTP NPDES Permit Application
Maximum Expected Concentration Calculation using TSD Appendix E Table E2 - Cadmium (ug/1)
xl yi=ln(xi) (yi-mu)2
1 2.00 0.69 0.4037
2 2.00 0.69 0.4037
3 2.00 0.69 0.4037
4 1.00 0.00 0.0033
5 1.00 0.00 0.0033
6 1.00 0.00 0.0033
7 1.00 0.00 0.0033
8 1.00 0.00 0.0033
9 1.00 0.00 0.0033
10 1.00 0.00 0.0033
11 1.00 0.00 0.0033
12 1.00 0.00 0.0033
13 1.00 0.00 0.0033
14 1.00 0.00 0.0033
15 1.00 0.00 0.0033
16 1.00 0.00 0.0033
17 1.00 0.00 0.0033
18 1.00 0.00 0.0033
19 1.00 0.00 0.0033
20' 1.00 0.00 0.0033
21 1.00 0.00 0.0033
22 1.00 0.00 0.0033
23 1.00 0.00 0.0033
24 1.00 0.00 0.0033
25 1.00 0.00 0.0033
26 1.00 0.00 0.0033
27 1.00 0.00 0.0033
28 1.00 0.00 0.0033
29 1.00 0.00 0.0033
30 1.00 0.00 0.0033
31 1.00 0.00 0.0033
32 1.00 0.00 0.0033
33 1.00 0.00 0.0033
34 1.00 0.00 0.0033
35 1.00 0.00 0.0033
36 1.00 0.00 0.0033
D (detection limit)
k sample size
r (# nondetects)
delta
dL
Ex (avg)
Vx (variance)
Probability level (P)
P adj for non det (P_a)
SQRT(LN(1 /((1-P_a)"2)))
Z_p
0.2
120
84
0.70
0.058
0.038
0.464
0.176
0.990
0.967
2.608
1.834
Crowders_AppendixC_tables.XLS Cadmium_AppE 01/27/2000 1

Table C-5
Gastonia Crowders Creek WWTP NPDES Permit Application
Maximum Expected Concentration Calculation using TSD Appendix E Table E2 - Chromium (ugll)
xl yl=in(xl) (yl-mu)2
1 32.00 3.47 3.5899
2 29.00 3.37 3.2266
3 16.00 2.77 1.4438
4 12.00 2.48 0.8352
5 12.00 2.48 0.8352
6 7.00 1.95 0.1405
7 7.00 1.95 0.1405
8 6.00 1.79 0.0487
9 6.00 1.79 0.0487
10 6.00 1.79 0.0487
11 4.20 1.44 0.0185
12 4.00 1.39 0.0341
13 3.00 1.10 0.2232
14 3.00 1.10 0.2232
15 3.00 1.10 0.2232
16 3.00 1.10 0.2232
17 2.50 0.92 0.4287
18 2.00 0.69 0.7707
19 2.00 0.69 0.7707
20 2.00 0.69 0.7707
21 2.00 0.69 0.7707
22 2.00 0.69 0.7707
23 2.00 0.69 0.7707
D (detection limit)
k sample size
r (# nondetects)
delta
02
Ex (avg)
Vx (variance)
Probability level (P)
P adj for non det (P_a)
SQRT(LN(1 /((1-P_a)^2)))
Z_p
2
119
96
0.81
1.571
0.743
2.962
14.246
0.990
0.948
2.434
1.629
Crowders_AppendixC_tables.XLS Chromium_AppE 01/27/2000 1

Table C-6
Gastonia Crowders Creek WWTP NPDES Permit Application
Maximum Expected Concentration Calculation using TSD Appendix E Table E2 - Copper (ug/I)
xl yl=ln(xi) (yl-m)2.
1 170.00 5.14 5.3462
2 140.00 4.94 4.4860
3 44.00 3.78 0.9227
4 36.00 3.58 0.5774
5 24.00 3.18 0.1256
6 23.80 3.17 0.1198
7 23.00 3.14 0.0973
8 21.00 3.04 0.0488
9 20.00 3.00 0.0296
10 19.00 2.94 0.0146
11 18.00 2.89 0.0045
12 18.00 2.89 0.0045
13 17.60 2.87 0.0020
14 16.00 2.77 0.0026
15 16.00 2.77 0.0026
16 16.00 2.77 0.0026
17 15.00 2.71 0.0134
18 14.00 2.64 0.0341
19 14.00 2.64 0.0341
20 14.00 2.64 0.0341
21 14.00 2.64 0.0341
22 14.00 2.64 0.0341
23 12.00 2.48 0.1147
24 12.00 2.48 0.1147
25 12.00 2.48 0.1147
26 11.10 2.41 0.1736
27 11.00 2.40 0.1812
28 11.00 2.40 0.1812
29 10.00 2.30 0.2715
30 10.00 2.30 0.2715
31 10.00 2.30 0.2715
32 10.00 2.30 0.2715
33 10.00 2.30 0.2715
34 10.00 2.30 0.2715
35 9.00 2.20 0.3924
36 9.00 2.20 0.3924
k sample size
a2
Ex (avg)
Vx (variance)
Probability level (P)
Coefficient
36
2.824
0.436
20.940
239.726
0.990
2.326
Crowders_AppendixC_tables.XLS Copper_AppE 01/27/2000 1

•
Table C-7
Gastonia Crowders Creek WWTP NPDES Permit Application
Maximum Expected Concentration Calculation using TSD Appendix E Table E2 - Lead (ug/I)
xl yl=In(xl) (yl-mu)2
1 22.00 3.09 3.5576
2 15.00 2.71 2.2595
3 15.00 2.71 2.2595
4 7.00 1.95 0.5491
5 7.00 1.95 0.5491
6 6.00 1.79 0.3444
7 6.00 1.79 0.3444
8 5.00 1.61 0.1637
9 5.00 1.61 0.1637
10 5.00 1.61 0.1637
11 4.00 1.39 0.0329
12, 4.00 1.39 0.0329
13 4.00 1.39 0.0329
14 4.00 1.39 0.0329
15 3.00 1.10 0.0113
16 3.00 1.10 0.0113
17 3.00 1.10 0.0113
18 3.00 1.10 0.0113
19 2.00 0.69 0.2619
20 2.00 0.69 0.2619
21 2.00 0.69 0.2619
22 2.00 0.69 0.2619
23 2.00 0.69 0.2619
24 2.00 0.69 0.2619
25 2.00 0.69 0.2619
26 2.00 0.69 0.2619
27 2.00 0.69 0.2619
28 2.00 0.69 0.2619
29 2.00 0.69 0.2619
30 2.00 0.69 0.2619
31 2.00 0.69 0.2619
32 2.00 0.69 0.2619
33 0.50 -0.69 3.6025
D (detection limit) 2
k sample size 120
r (# nondetects) 87
delta 0.73
1.205
02 0.556
Ex (avg) 2.662
Vx (variance) 5.127
Probability level (P) 0.990
P adj for non det (P_a) 0.964
SQRT(LN(1/((1-P_a)^2))) 2.575
Z • 1.795
Crowders_AppendixC_tables.XLS Lead_AppE 01/27/2000 1

Table C-8 •
Gastonia Crowders Creek WWTP NPDES Permit Application
Maximum Expected Concentration Calculation using TSD Appendix E Table E2 - Mercury (ugll)
xl yl=ln(xi) (yl-mu)2
1 0.30 -1.20 0.0731
2 0.20 -1.61 0.0183.
3 0.20 -1.61 0.0183
D (detection limit) 5
k sample size 111
r (# nondetects) 108
delta 0.97
-1.474
dL 0.055
Ex (avg) 4.871
Vx (variance) 0.597
Probability level (P) 0.990
P ad) for non det (P_a) 0.630
SQRT(LN(1/((1-P_a)^2))) 1.410
Z—Q 0.331.
Crowders_AppendixC_tables.XLS Mercury_AppE 01/27/2000 1

Table C-9
Gastonia Crowders Creek WWTP NPDES Permit Application
Maximum Expected Concentration Calculation using TSD Appendix E Table E2 - Molybdenum (ug/I)
xi yl=in(xi) (yi-mu)2
1 12.00 2.48 0.6944
2 10.00 2.30 0.4238
3 6.00 1.79 0.0197
4 5.00 1.61 0.0018
5 5.00 1.61 0.0018
6 4.00 1.39 0.0704
7 3.80 1.34 0.1002
8 2.00 0.69 0.9186
D (detection limit)
k sample size
r (# nondetects)
delta
11
Ex (avg)
Vx (variance)
Probability level (P)
P adj for non det (P_a)
SQ RY(LN (1 /((1-P_a)^2)))
Z_p
2
19
11
0.58
1.652
0.319
3.733
10.040
0.990
0.976
2.735
1.982
Crowders_AppendixC_tables.XLS Molybdenum_AppE 01/27/2000 1

•
Table C-10
Gastonia Crowders Creek WWTP NPDES Permit Application
Maximum Expected Concentration Calculation using TSD Appendix E Table E2 - Nickel (ug/I)
xl yl=in(xi) (yl-mu)2
1 59.00 4.08 2.9361
2 55.00 4.01 2.7004
3 35.00 3.56 1.4192
4 30.00 3.40 1.0757
5 30.00 3.40 1.0757
6 25.00 3.22 0.7307
7 20.00 3.00 0.3990
8 18.00 2.89 0.2770
9 15.00 2.71 0.1183
10 15.00 2.71 0.1183
11 13.00 2.56 0.0404
12 13.00 2.56 0.0404
13 12.00 2.48 0.0146
14 12.00 2.48 0.0146
15 12.00 2.48 0.0146
16 11.00 2.40 0.0011
17 10.60 2.36 0.0000
18 10.00 2.30 0.0038
19 10.00 2.30 0.0038
20 10.00 2.30 0.0038
21 10.00 2.30 0.0038
22 10.00 2.30 0.0038
23 10.00 2.30 0.0038
24 10.00 2.30 0.0038
25 9.00 2.20 0.0278
26 9.00 2.20 0.0278
27 8.00 2.08 0.0810
28 8.00 2.08 0.0810
29 7.00 1.95 0.1748
30 7.00 1.95 0.1748
31 6.00 1.79 0.3275
32 6.00 1.79 0.3275
33 6.00 1.79 0.3275
34 6.00 1.79 0.3275
35 4.00 1.39 0.9560
36 4.00 1.39 0.9560
37 4.00 1.39 0.9560
38 3.70 1.31 1.1145
39 2.00 0.69 2.7919
D (detection limit)
k sample size
r (# nondetects)
delta
lL
dL
Ex (avg)
Vx (variance)
Probability level (P)
P adj for non det (P_a)
SQRT(LN(1 /((1-P_a)^2)))
zp
E1
2
43
4
0.09
2.364
0.517
12.677
128.219
0.990
0.989
3.003
2.290
Crowders_AppendixC_tables.XLS Nickel_AppE 01/27/2000 1

Table C-11
Gastonia Crowders Creek WWTP NPDES Permit Application
Maximum Expected Concentration Calculation using TSD Appendix E Table E2 - Selenium (ug/1)
xi yi=ln(xi) (yi-mu)2
1 10.00 2.30 4.3202
2 4.00 1.39 1.3507
3 4.00 1.39 1.3507
4 3.00 1.10 0.7648
5 3.00 1.10 0.7648
6 2.50 0.92 0.4791
7 2.00 0.69 0.2200
8 2.00 0.69 0.2200
9 2.00 0.69 0.2200
10 2.00 0.69 0.2200
11 2.00 0.69 0.2200
12 2.00 0.69 0.2200
13 0.01 -4.61 23.3217
14 0.01 -4.61 23.3217
D (detection limit) 2
k sample size 144
r (# nondetects) 130
delta 0.90
0.224
Q2
Ex (avg)
Vx (variance)
Probability level (P)
P adJ for non det (P_a)
SQRT(LN(1/((1-P a)"2)))
Z_p
4.384
2.895
973.429
0.990
0.897
2.133
1.266
Crowders_AppendixC tables.XLS01/27/2000 1

Table C-12
Gastonia Crowders Creek WWTP NPDES Permit Application
Maximum Expected Concentration Calculation using TSD Appendix E Table E2 - Silver (ug/I)
xi yi=ln(xi) (yl-mu)2
1 11.00 2.40 0.7677
2 10.00 2.30 0.6098
3 2.00 0.69 0.6865
4 2.00 0.69 0.6865
D (detection limit)
k sample size
r (# nondetects)
delta
o2
Ex (avg)
Vx (variance)
Probability level (P)
P adj for non det (P_a)
SQ RT(LN(1 /((1-P_a)^2)))
Z_p
2
37
33
0.89
1.522.
0.917
2.567.
11.167
0.990
0.908
2.182
1.326
Crowders_AppendixC_tables.XLS Silver_AppE 01/27/2000 1

a'
Table C-13
Gastonia Crowders Creek WWTP NPDES Permit Application
Maximum Expected Concentration Calculation using TSD Appendix E Table E2 - Toluene (ug/I)
xi yi=ln(xi) (yi-mu)2
1 5.00 1.61 4.5174
2 2.00 0.69 1.4620
3 1.00 0.00 0.2662
4 1.00 0.00 0.2662
5 1.00 0.00 0.2662
6 1.00 0.00 0.2662
7 1.00 0.00 0.2662
8 1.00 0.00 0.2662
9 1.00 0.00 0.2662
10 1.00 0.00 0.2662
11 1.00 0.00 0.2662
12 1.00 0.00 0.2662
13 1.00 0.00 0.2662
14 1.00 0.00 0.2662
15 1.00 0.00 0.2662
16 1.00 0.00 0.2662
17 1.00 0.00 0.2662
18 1.00 0.00 0.2662
19 1.00 0.00 0.2662
20 1.00 0.00 0.2662
21 0.50 -0.69 0.0314
22 0.50 -0.69 0.0314
23 0.01 -4.61 16.7216
24 0.01 -4.61 16.7216
25 0.01 -4.61 16.7216
D (detection limit)
k sample size
r (# nondetects)
delta
a2
Ex (avg)
Vx (variance)
Probability level (P)
P adj for non det (P_a)
SQRT(LN(1 /((1-P_a)^2)))
Z_p
2
64
39
0.61
-0.516
2.542
2.050
20.686
0.990
0.974
2.707
1.950
RPM"" 1<c33V2
Crowders_AppendixC_tables.XLS01 /27/2000 1

Table C-14
Gastonia Crowders Creek WWTP NPDES Permit Application
Maximum Expected Concentration Calculation Using TSD Appendix E Table E2 - Zinc (ugll)
xl yl=In(xi) (yl-m)2
1 170.00 5.14. 5.3462
2 140.00 4.94 4.4860
3 44.00 3.78 0.9227
4 36.00 3.58 0.5774
5 24.00 3.18 0.1256
6 23.80 3.17 0.1198
7 23.00 3.14 0.0973
8 21.00 3.04 0.0488
9 20.00 3.00 0.0296
10 19.00 2.94 0.0146
11 18.00 2.89 0.0045
12 18.00 2.89 0.0045
13 17.60 2.87 0.0020
14 16.00 2.77 0.0026
15 16.00 2.77 0.0026
16 16.00 2.77 0.0026
17 15.00 2.71 0.0134
18 14.00 2.64 0.0341
19 14.00 2.64 0.0341
20 14.00 2.64 0.0341
21 14.00 2.64 0.0341
22 14.00 2.64 0.0341
23 12.00 2.48 0.1147
24 12.00 2.48 0.1147
25 12.00 2.48 0.1147
26 11.10 2.41 0.1736
27 11.00 2.40 0.1812
28 11.00 2.40 0.1812
29 10.00 2.30 0.2715
30 10.00 2.30 0.2715
31 10.00 2.30 0.2715
32 10.00 2.30 0.2715
33 10.00 2.30 0.2715
34 10.00 2.30 0.2715
35 9.00 2.20 0.3924
36 9.00 2.20 0.3924
k sample size
a2
Ex (avg)
Vx (variance)
Probability level (P)
Coefficient
36
2.824
0.436
20.940
239.726
0.990
2.326
Crowders_AppendixC_tables.XLS01 /27/2000 1

1
Table C-15
Gastonia Crowders Creek WWTP NPDES Permit Application
Maximum Expected Concentration Calculation Based on TSD Chapter
Cyanide Arsenic Cadmium Chromium Copper Mercury Molybdenum Nickel Selenium Silver Toluene
(ug/I) (ug/l) (ug/I) (ug/l) (ug/I) Lead (ug/l) (ug/I) (ug/l) (ug/l) (ug/I) (ug/I) (ug/l) Zinc (ug/I)
# of samples 177 20 120 119 36 120 111 19 43 144 37 64 36
CV 1.0134509 0.7892681 0.2728323 1.1310289 1.4029574 1.4524663 0.26420407 0.546213597 0.9569234 0.8571543 1.3883595 0.5000369 0.6693361
Max 30.4 2 2 32 170 22 0.3 12 59 10 11 5 350
Sigma 0.8405937 0.6958749 0.2679501 0.9076542 1.0430656 1.0651351 0.25976 0.510973271 0.8062781 0.7421875 1.0364184 0.472412 0.608433
Probability level (P) 0.974 0.794 0.962 0.962 0.880 0.962 0.959 0.785 0.898 0.969 0.883 0.931 0.880
SQRT(LN(1/((1-P_a)^2))) 2.706 1.778 2.561 2.558 2.059 2.561 2.531 1.753 2.139 2.630 2.071 2.310 2.059
Z p 1.949 0.821 1.779 1.775 1.175 1.779 1.744 0.788 1.273 1.860 1.190 1.480 1.175
Probability level (P) 0.990 0.990 0.990 0.990 0.990 0.990 0.990 0.990 0.990 0.990 0.990 0.990 0.990
SQRT(LN(1/((1-P_a)^2))) 3.035 3.035 3.035 3.035 3.035 3.035 3.035 3.035 3.035 3.035 3.035 3.035 3.035
Z p 2.327 2.327 2.327 2.327 2.327 2.327 2.327 2.327 2.327 2.327 2.327 2.327 2.327
C99 4.966 3.963 1.800 5.474 6.573 6.760 1.769 2.882 4.716 4.269 6.517 2.685 3.423
Cx 3.614 1.390 1.554 3.318 1.976 3.772 1.521 1.313 2.016 3.019 2.006 1.800 1.698
Factor 1.374 2.851 1.158 1.650 3.326 1.792 1.164 2.195 2.339 1.414 3.248 1.492 2.016
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Crowders_AppendixC_tables.XLS01 /27/2000 1