NC0085359_Permit (Modification)_20061127

NPDES DOCIMENT SCANNING COVER SHEET
NPDES Permit:
NC0085839
Twelve Mile Creek WWTP
Document Type:
Permit Issuance
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification, .^,
Complete File - Historical
Engineering Alternatives (EAA)
Correspondence
Owner Name Change
Instream Assessment (67b)
Speculative Limits
Environmental Assessment (EA)
Document Date:
November 27, 2006
Thios document ire prixnted on reuoae paper - ignore any
content on the newer-0e aside

Michael F. Easley, Governor
State of North Carolina
William G. Ross, Jr., Secretary
Department of Environment and Natural Resources
Alan W. Klimek, P.E., Director
Division of Water Quality
November 27, 2006
Ms. Christie Putnam
Union County Public Works
400 North Church St.
Monroe, North Carolina 28112
Subject: NPDES Permit Modification
Union County - Twelve Mile Creek
NPDES Permit No. NC0085359
Union County
Dear Ms. Putnam:
Attached to this letter is the NPDES permit modification for Union County - Twelve Mile
Creek wastewater treatment plant, NPDES Permit No. NC0085359. 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.
This permit modification includes only the addition of interim limits for a design flow of 3.0
MGD. After Union County receives an Authorization to Operate from the Division's Construction,
Grants, and Loans Section (and submits any certification that may be required), the County may
operate at a design flow not to exceed 3.0 MGD. This permit (as with the permit issued June 26,
2006) also includes provisions for an expansion phase to 6.0 MGD.
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, Mail Service Center 6714, Raleigh, North Carolina
27699-6714. Unless such a demand is made, this permit shall be final and binding.
Please take notice that this permit is not transferable except after notice to the Division of
Water Quality. The Division of Water Quality 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, the Division of Land Resources, the Coastal Area Management Act, or
any other federal or local governmental permit.
If you have any questions regarding the NPDES permit modification, please contact Susan
Wilson at (919) 733 - 5083, extension 510.
Sincerely,
,,___Alan W. Klimek, P.E.
cc: Mooresville Regional Office/Surface Water Section
Central Files
NPDES Unit
EPA Region IV, Roosevelt Childress
Jim Struve, P.E. Hazen and Sawyer, P.C.
4944 Parkway Plaza Blvd., Suite 375
Charlotte, NC 28217
North Carolina Division of Water Quality
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
[phone]
FAX [phone]
On the Internet at http://h2o.enr.state.nc.us/

Permit NC0085359 .
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, the
Union County Public Works Department
is hereby authorized to discharge wastewater from a facility located at the
Twelve Mile Creek Wastewater Treatment Plant
3104 Providence Road South
Waxhaw
Union County
to receiving waters designated as Twelve Mile Creek in the Catawba River Basin in
accordance with effluent limitations, monitoring requirements, and other conditions
set forth in Parts I, II and III hereof.
This permit shall become effective November 27, 2006.
This permit and authorization to discharge shall expire at midnight on June 30, 2010.
Signed this day November 27, 2006.
Alan W. Klimek, P.E., Director
Division of Water Quality
By Authority of the Environmental Management Commission

Permit NC0085359
SUPPLEMENT TO PERMIT COVER SHEET
All previous NPDES Permits issued to this facility, whether for operation or discharge are hereby revoked,
and as of this issuance, any previously issued permit bearing this number is no longer effective.
Therefore, the exclusive authority to operate and discharge from this facility arises under the permit
conditions, requirements, terms, and provisions included herein.
The Union County Public Works Department is hereby authorized to:
1. Continue to operate an existing 2.5 MGD wastewater treatment facility that includes
the following components:
> Self-cleaning influent filter screen
> Vortex grit chamber
> pH adjustment .
> Two oxidation ditch systems
> Two final clarifiers
> Dual tertiary sand filters
> Ultraviolet disinfection
➢ Cascade post aeration
➢ Two sludge storage tanks with diffused aeration
> Sludge digester (1.0 MGD)
> Alum and polymer feed systems
> Stand-by power generator
This facility is located at the Twelve Mile Creek Wastewater Treatment Plant off
Providence Road South near Waxhaw in Union County.
2. Upon issuance of an Authorization to Operate from the Division of Water Quality (and
any subsequent certification, if required), operate a wastewater treatment facility not to
exceed 3.0 MGD design flow,
3. Upon issuance of an Authorization to Construct permit by the Division and
submission of the engineer's certification for expansion, operate a wastewater
treatment facility up to a design flow of 6.0 MGD and,
4. Discharge from said treatment works at the location specified on the attached map into
Twelve Mile Creek, a class C stream in the Catawba River Basin.

Permit NC0085359
A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS [2.5 MGD]
During the period beginning on the effective date of the permit and lasting until expansion above 2.5
MGD or expiration, the Permittee is authorized to discharge from outfall 001. Such discharges shall
be limited and monitored by the Permittee as specified below:
PARAMETER
LIMITS
MONITORING REQUIREMENTS
Monthly
Average
Weekly
Averaje
Daily
Maximum
Measurement
Frequency
Sample Type
Sample Location1
Flow
2.5 MGD
Continuous
Recording
Influent or Effluent
BOD, 5-day, 20°C
(April 1- October 31) 2
5.0 mg/L
7.5 mg/L
Daily
Composite
Influent & Effluent
BOD, 5-day, 20°C
(November 1- March 31) 2
10.0 mg/L
15.0 mg/L
Daily
Composite
Influent & Effluent
Total Suspended Solids 2
30.0 mg/L
45.0 mg/L
Daily
Composite
Influent & Effluent
NH3 as N
(April 1— October 31)
2.0 mg/L
6.0 mg/L
Daily
Composite
Effluent
NH3 as N • . .
(November 1— March 31)
4.0 mg/L
12.0 mg/L
Daily
Composite
Effluent
Dissolved Oxygen3
Daily
Grab
Effluent
Dissolved Oxygen
(June through September)
3/Week
Grab
Upstream & Downstream1
Dissolved Oxygen
(October through May)
1/Week
Grab
Upstream & Downstream1
pH
> 6.0 and < 9.0 standard units
Daily
Grab
Effluent
Total Residual Chlorine4
17.0 pg/L
28.0 pg/L
Daily
Grab
Effluent
Total Nitrogen (NO2+NO3+TKN)
Monthly
Composite
Effluent
Total Phosphorus 5
Monthly Average: 41.70 pounds/day
12 Month average: 20.85 pounds/day
Monthly
Composite
Effluent
Temperature, °C
Daily
Grab
Effluent
Temperature, °C
(June through September)
.
3/Week
Grab
Upstream & Downstream1
Temperature, °C
(October through May)
1/Week
Grab
Upstream & Downstream1
Fecal Coliform (geometric mean)
200/100 ml
400/100 ml
Daily
Grab
Effluent
Fecal Coliform (geometric mean)
(June through September)
3/Week
Grab
Upstream & Downstream1
Fecal Coliform (geometric mean)
(October through May)
1/Week
Grab
Upstream & Downstream1
Conductivity
Daily
Grab
Effluent
Conductivity
(June through September)
3/Week
Grab
Upstream & Downstream1
Conductivity
(October through May)
1/Week
Grab
Upstream & Downstream1
Total Chromium6
Monthly
Composite
Effluent
Total Copper
13.2 pg/l
18.5 pgfl
Weekly
Composite
Effluent
Total Zinc
175 pg/I
Weekly
Composite
Effluent
Chronic Toxicity7
Quarterly
Composite
Effluent
Annual Pollutant Scan8
Annually
See A.(5.)
Effluent
Notes on following page:

Permit NC0085359 r
A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS [2.5 MGD]
[continued]
1. Upstream: 50 feet upstream from the outfall. Downstream samples shall be collected at two
locations. D 1: One quarter mile downstream from the outfall, before confluence with the first
tributary. D2: at NCSR 1301. Additional downstream dissolved oxygen monitoring is recommended
to provide DO stream profile of Twelve Mile Creek in North Carolina and South Carolina.
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. Monitoring requirement and limit applies only if chlorine is added for disinfection.
5. Part A. (5.) describes the methodology for calculation of the monthly average and 12-month limits.
6. Monitoring requirement may be deleted upon written notification from the permitting authority.
7. Chronic Toxicity (Ceriodaphnia) P/F @ 90% with testing in February, May, August and November
(see A. (4.)).
8. See Special Condition A. (6.)
There shall be no discharge of floating solids or visible foam in other than trace amounts.

Permit NC0085359
A. (2.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS [3.0 MGD]
During the period after receipt of an Authorization to Operate (and any subsequent certification if
required) and lasting until expansion above 3.0 MGD, the Permittee is authorized to discharge from
outfall 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 Locations
Flow
3.0 MGD
Continuous
Recording
Influent or Effluent
BOD, 5-day, 20°C
(April 1- October 31) 2
5.0 mglL
7.5 mg/L
Daily
Composite
Influent & Effluent
BOD, 5-day, 20°C
(November 1 - March 31) 2
10.0 mg/L
15.0 mg/L
Daily
Composite
Influent & Effluent
Total Suspended Solids 2
30.0 mg/L
45.0 mg/L
Daily
Composite
Influent & Effluent
NH3 as N
. (April 1— October 31)
1.0 mglL
3.0 mg/L
Daily
Composite
Effluent
NH3 as N
(November 1— March 31)
2.0 mg/L
6.0 mg/L
Daily
Composite
Effluent
Dissolved 0xygen3
Daily
Grab
Effluent
Dissolved Oxygen
(June through September)
3/Week
Grab
Upstream & Downstreaml
Dissolved Oxygen
(October through May)
1/Week
Grab
Upstream & Downstreaml
pH
> 6.0 and < 9.0 standard units
Daily
Grab
Effluent
Total Residual Chlorine4
17.0 pg/L
Daily
Grab
Effluent
Total Nitrogen (NO2+NO3+TKN)
Monthly
Composite
Effluent
Total Phosphorus 5
Monthly Average: 41.70 pounds/day
Monthly
Composite
Effluent
Temperature, °C
Daily
Grab
Effluent
Temperature, °C
(June through September)
3/Week
Grab
Upstream & Downstreaml
Temperature, °C
(October through May)
11Week
Grab
Upstream & Downstreaml
Fecal Coliform (geometric mean)
200/100 ml
400/100 ml
Daily
Grab
Effluent
Fecal Coliform (geometric mean)
(June through September)
3/Week
Grab
Upstream & Downstreaml
Fecal Coliform (geometric mean)
(October through May)
1/Week
Grab
Upstream & Downstreaml
Conductivity
Daily
Grab
Effluent
Conductivity
(June through September)
3/Week
Grab
Upstream & Downstreaml
Conductivity
(October through May)
1/Week
Grab
Upstream & Downstreaml
Total Chromium6
Monthly
Composite
Effluent
Total Copper
13.0 pg/I
18.5 pgll
Weekly
Composite
Effluent
Total Zinc
172 pg/I
Weekly
Composite
Effluent
Chronic Toxicity7
Quarterly
Composite
Effluent
Annual Pollutant Scan8
Annually
See A.(5.)
Effluent
Notes on following page:

Permit NC0085359'
A. (2.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS [3.0 MGD]
-[continued]
1. Upstream: 50 feet upstream from the outfall. Downstream samples shall be collected at two
locations. D 1: One quarter mile downstream from the outfall, before confluence with the first
tributary. D2: at NCSR 1301. Additional downstream dissolved oxygen monitoring is recommended
to provide DO stream profile of Twelve Mile Creek in North Carolina and South Carolina.
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. The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units.
5. Monitoring requirement and limit applies only if chlorine is added for disinfection.
6. Part A. (5.) describes the methodology for calculation of the monthly average and 12-month limits.
7. Monitoring requirement may be deleted upon written notification from the permitting authority.
8. Chronic Toxicity (Ceriodaphnia) P/F @ 90% with testing in February, May, August and November
(see A. (4.)).
9. See Special Condition A.(6).
There shall be no discharge of floating solids or visible foam in other than trace amounts.

Permit NC0085359
A. (3.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS [6.0 MGD]
During the period beginning upon expansion above 3.0 MGD 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:
EFFLUENT
CHARACTERISTICS ,
LIMITS
MONITORING REQUIREMENTS
Monthly
Average
Weekly
Average
Daily
Maximum
Measurement
Frequency
Sample Type
Sample Location'
Flow
6.0 MGD
Continuous
Recording
Influent or Effluent
BOD, 5-day, 20°C
(April 1- October 31) 2
5.0 mg/L
7.5 mglL
Daily
Composite
Influent & Effluent
BOD, 5-day, 20°C
(November 1- March 31) 2
10.0 mg/L
15.0 mg/L
Daily
Composite
Influent & Effluent
Total Suspended Solids 2
30.0 mg/L
45.0 mglL
Daily
Composite
Influent & Effluent
NH3 as N
(April 1- October 31)
1.0 mglL
3.0 mg/L
Daily
Composite
Effluent
NH3 as N
(November 1- March 31)
2.0 mg/L
6.0 mg/L
Daily
Composite
Effluent
Dissolved Oxygen3
Daily
Grab
Effluent
Dissolved Oxygen
(June through September)
3/Week
Grab
Upstream & Downstream'
Dissolved Oxygen
(October through May)
1lWeek
Grab
Upstream & Downstream'
pH
> 6.0 and < 9.0 standard units
Daily
Grab
Effluent
Total Residual Chlorine4
17.0 pg/L
Daily
Grab
Effluent
Total Nitrogen (NO2+NO3+TKN)
Monthly
Composite
Effluent
Total Phosphorus 5
Monthly Average: 41.70 pounds/day
Monthly
Composite
Effluent
Temperature, °C
Daily
Grab
Effluent
Temperature, °C
(June through September)
3/Week
Grab
Upstream & Downstream'
Temperature, °C
(October through May)
1/Week
Grab
Upstream & Downstream'
Fecal Coliform (geometric mean)
200/100 ml
400/100 ml
Daily
Grab
Effluent
Fecal Coliform (geometric mean)
(June through September)
3/Week
Grab
Upstream & Downstream'
Fecal Coliform (geometric mean)
(October through May)
1lWeek
Grab
Upstream & Downstream'
Conductivity
Daily
Grab
Effluent
Conductivity
(June through September)
3/Week
Grab
Upstream & Downstream'
Conductivity
(October through May)
1/Week
Grab
Upstream & Downstream'
Total Chromium6
Monthly
Composite
Effluent
Total Copper
13.0 pg/l
18.5 pg/l
Weekly
Composite
Effluent
Total Zinc
172 pg/I
Weekly
Composite
Effluent
Chronic Toxicity?
Quarterly
Composite
Effluent
Annual Pollutant Scan/
Annually
See A.(5.)
Effluent
Notes on following page:

Permit NC0085359
A. (3.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS [6.0 MGD]
-[continued]
1. Upstream: 50 feet upstream from the outfall. Downstream samples shall be collected at two
locations. D 1: One quarter mile downstream from the outfall, before confluence with the first
tributary. D2: at NCSR 1301. Additional downstream dissolved oxygen monitoring is
recommended to provide DO stream profile of Twelve Mile Creek in North Carolina and South
Carolina.
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. The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units.
5. Monitoring requirement and limit applies only if chlorine is added for disinfection.
6. Part A. (5.) describes the methodology for calculation of the monthly average and 12-month
limits.
7. Monitoring requirement may be deleted upon written notification from the permitting authority.
8. Chronic Toxicity (Ceriodaphnia) P/F @ 90% with testing in February, May, August and
November (see A. (4.)).
9. See Special Condition A.(6).
There shall be no discharge of floating solids or visible foam in other than trace amounts.

Permit NC0085359
SUPPLEMENT TO EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
SPECIAL CONDITIONS
A. (4.) 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 90%.
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 of
February, May, August, and November. Effluent sampling for this testing shall be performed at the
NPDES permitted final effluent discharge below all treatment processes.
If the test procedure performed as the first test of any single quarter results in a failure or ChV below
the permit limit, then multiple -concentration testing shall be performed at a minimum, in each of the
two. following months as described in "North Carolina Phase II Chronic Whole Effluent Toxicity Test
Procedure" (Revised -February 1998) or subsequent versions.
The chronic value for multiple concentration tests will be determined using the geometric mean of the
highest concentration having no detectable impairment of reproduction or survival and the lowest
concentration that does have a detectable impairment of reproduction or survival. The definition of
"detectable impairment," collection methods, exposure regimes, and further statistical methods are
specified in the "North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure" (Revised -
February 1998) or subsequent versions.
All toxicity testing results required as part of this permit condition will be entered on the Effluent
Discharge Monitoring Form (MR-1) for the months in which tests were performed, 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 NC0085359
A. (5.) TOTAL PHOSPHORUS (TP) MONITORING
The Permittee shall calculate a 12-month rolling average mass loading as the sum of
monthly loadings, according to the following equations:
(1) Monthly Average (pounds/day) = TP x Qw x 8.34
Where:
TP = the arithmetic average of total phosphorus concentrations (mg/L) obtained via
composite samples (either daily, weekly, or monthly average values) collected during
the month
Qw = the average daily waste flow (MGD) for the month
8.34= conversion factor, from (mg/L x MGD) to pounds
The 12-month rolling average mass loading is defined as the sum of the monthly average
loadings for the previous 12 months inclusive of the reporting month:
12
(2) 12-Month Mass Loading (pounds/day)= >TPma =12 (inclusive of reporting month)
Where:
•
TPma is defined as the total phosphorus monthly average mass loading (calculated
above) .
The monthly average and 12-month average mass loadings shall be reported on the attached
worksheet [see next page] and submitted with the Discharge Monitoring Report (DMR) for
Twelve Mile Creek WWTP.
The first worksheet is due with the DMR 12 months from the effective date of the TP limit
(referenced in A. (1)).
In the period between the effective date and the requirement to submit the attached
worksheet, the TP monthly average mass loadings should be reported on the appropriate
monthly DMR.
The Permittee shall report the TP concentration for each sample on the appropriate DMR.
Reporting of and compliance with the TP limit shall be done on a monthly basis.

Permit NC0085359
A. (6.) EFFLUENT POLLUTANT SCAN
The permittee shall perform an annual Effluent Pollutant Scan for all parameters listed in the table
below (in accordance with 40 CFR Part 136). The annual effluent pollutant scan samples shall
represent seasonal (summer, winter, fall, spring) variations over the 5-year permit cycle. Unless
otherwise indicated, metals shall be analyzed as "total recoverable." Additionally, the method detection
level and the minimum level shall be the most sensitive as provided by the appropriate analytical
procedure.
Ammonia (as N)
Chlorine (total residual, TRC)
Dissolved oxygen
Nitrate/Nitrite
Kjeldahl nitrogen
0il and grease
Phosphorus
Total dissolved solids
Hardness
Antimony
Arsenic
Beryllium
Cadmium
Chromium
Copper
Lead
Mercury
Nickel
Selenium
Silver
Thallium
Zinc
Cyanide
Total phenolic compounds
Volatile organic compounds:
Acrolein
Acrylonitrile
Benzene
Bromoform
Carbon tetrachloride
Chlorobenzene
Chlorodibromomethane
Chloroethane
2-chloroethylvinyl ether
Chloroform
Dichlorobromomethane
1,1-dichloroethane
1,2-dichloroethane
Trans-1,2-dichloroethylene
1,1-dichloroethylene
1,2-dichloropropane
1,3-dichloropropylene
Ethylbenzene
Methyl bromide
Methyl chloride
Methylene chloride
1,1, 2, 2-te trach to ro a th a n e
Tetrachloroethylene
Toluene
1,1,1-trichloroethane
1,1,2-dichloroethane
Trichloroethylene
Vinyl chloride
Acid -extractable compounds:
P-chloro-m-cresol
2-chlorophenol
2,4-dichlorophenol
2,4-dimethylphenol
4,6-dinitro-o-cresol
2,4 dinitrophenol
2-nitrophenol
4-nitrophenol
Pentachlorophenol
Phenol
2,4,6-trichlorophenol
Base -neutral compounds:
Acenaphthene
Acenaphthylene
Anthracene
Benzidine
Benzo(a)anthracene
Benzo(a)pyrene
3,4 benzofluoranthene
Benzo(ghi)perylene
Benzo(k)fluoranthene
Bis (2-chloroethoxy) methane
Bis (2-chloroethyl) ether
Bis (2-chloroisopropyl) ether
Bis (2-ethylhexyl) phthalate
4-bromophenyl phenyl ether
Butyl benzyl phthalate
2-chloronaphthalene
4-chlorophenyl phenyl ether
Chrysene
Di-n-butyl phthalate
Di-n-octyl phthalate
Dibenzo(a,h)anthracene
1,2-dichlorobenzene
1,3-dichlorobenzene
1,4-dichlorobenzene
3,3-dichlorobenzidine
Diethyl phthalate
Dimethyl phthalate
2,4-dinitrotoluene
2,6-dinitrotoluene
1,2-diphenylhydrazine
Fluoranthene
Fluorene
Hexachlorobenzene
Hexachlorobutadiene
Hexachlorocyclo-pentadiene
Hexachloroethane
Indeno(1,2,3-cd)pyrene
Isophorone
Naphthalene
Nitrobenzene
N-nitrosodi-n-propylamine
N-nitrosodimethylamine
N-nitrosodiphenylamine
Phenanthrene
Pyrene
1,2,4-trichlorobenzene
Test results shall be reported to the Division in DWQ Form- DMR-PPA1 or in a form approved
by the Director, within 90 days of sampling. A copy of the report shall be submitted to Central
Files at the following address: Division of Water Quality, Surface Water Protection Section,
1617 Mail Service Center, Raleigh, North Carolina 27699-1617

Permit NC0085359'
Reporting Month:
Beginning Month:
Ending Month:
Union County
Twelve Mile Creek WWTP
Nutrient Worksheet
NPDES Permit NCO085359
(Month 1)
(Month 12)
Monthly Average Total Phosphorus
pounds/day
Month 1
Month 2
Month 3
Month 4
Month 5
Month 6
Month 7
Month 8
Month 9
Month 10
Month 11
Month 12
12-Month Mass
Loading
Note: The TP mass loadings for the current reporting month should be entered for Month 1.

1 o/Z(o C fri(0/4 6.
�BNr-74 Pi AAA-) M) c ) 3-6014 L ., 90tC %,
C6.c.x L )
S l MA ti'►e.- T.
Dr:4 34 ifc,1.s7 LIP ?b SR6ep o+l twllwr �-1(RA 1;c4t15
IA At I
-FLAe- lb J
Of) 5v»ws
1 (,)- 14/k1i5 bout-? MDT &E P2mSGciu_
-t' UNL 0005to1.J
him' ci..44a4�► -5
0134 g-A5 > 2 t -
$ yJ ( Pow6o-- 4 O_ =
Uv*o(N' p,0rJ
�vo C ue Di Situp• Nfl
fiArD Pools D..l,Tff4c5 (L Imo/peta ca,us 77 4 )
C
o T Coa5 c 571 -1-' j 11/17c e9 P N 3/- CA"L""
Cn 5(JC• coat 1-u1,6 2 des r, u. ,q (7/c rA,_
no3
C Pcrr Gant 5 c SzF ^1"f"g-4T--t_Ltz—istr
Jrt r-J /1-)Rit L-y ) DPj &PI 'L

• c 566 70A-r- n- 71Z 5+--fiw Aikti7 coarse 57ev ,—
01/441 ( Use)
axr
JJN4' 4415 (L0.3J l-/ pc- eszr_41 A-b 4o op) =7 -Fr w uP
Sv --7/ktil„`r/ M P ,J * r,-5 CARD RecoiQ wAs. 50oD 4i2 (?98
cour L, Z Af o)
S-rr c,t 135 ((0 7 r /.�.r
-TF)
(0(9 )4- )owyNN
• Ao' Pry PAALI M `lli 1 1440 - 4011-15- (NC") "or Per--141,-Mit-)
-lb D )
• Ntr P-6-c. re . LSD (2co -�i- coo
t TiJ- Gt,w' 6s 4o4 - T j P r D i ?b ' A"' TD
(67/0oc(c- Pat)tit TP %r par i 4 food LU "j7 i T l 0 Y t r-
t,A 5 Da N1'S lkork 00 . ir- STTP
4501-4.GTI oAI 'Plfrr wo 5 o ,
5Pu rt4 5 C 5 s(.,u.l � VI/ 32( PFr:V2'el4Pr o 1D.
- oc, (,Lrl- h'c-u' ') L.AtAY NOT- , co7e&J J+i-u - Jtr )
.s -r -►PLV 'GA/9 0 - i741 5 itA-0"r114 Nor) T 4 r.i4 Oeki
CA44 . N a te, — ,rs C Tb 1J - / �
mar fC%r^r4 f},ur„ (244 K f Neu pro.r ce->°cDac.D LDS
Ar6g0 rb orv- lit-crAt pcg-t.sfyzi,r6-
coo p 5
61)64- mAeop � �?
(tooe 641 cbt-a•ue)
v-Ycoq-cg,vpyfe__ TP

10 fav UNroN �•
4v'` h*-G 0e mot'S c)6,
t\iOi p 7 54- fk1,1 d: P—
efJC( 1- I5`ru
Nog-) 5°G S& i 6-F>
t(71-7,> r l on► rimer4-
r s 'Z•J c solo
W a 7 r . arAlt yes ( Olt) 1•(fr.) 6 M P 7c- C r TA-L- UP 2 2a4F1%
Tout iP
P`'' s
3_ 60„
if lt,15kr,.1 Ce oc,�; oar - t4 3/( /07
R";»scD,J .cpa� poke, J &i n 25J �o7 4t
.a
ye 5 q/0 7
p t .l i N Sri o/J-.p*L po- CP TIC 69AI Fe, nJ C;Al l
(a ?UC
vouVl. 1,Wi'. io S cArilA rT n. / . e(cci CO.,..Pot-'5vVi'S
` /F4-1 s Ka,rb c"r isizA 7.v 1-7- w bi 2 ..-
74-142 (� /'.-("6 i S.a Vic, Vr0- /r wou c.. a_ ----i\r'c; -T, 7, 1C:7%1V--' .;eC ' tr-)
W I I.V PC.O Q (),J ('1� '`►1 (r s cc P lei -Ce,
9 A- p''c CuLJ42 Pe» S t LLCW

,, 5 T 7b CAA_ Lt ffud
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Pightv6w pu .-,Yy AT $.(ii7 co --
Pr 1-7 Sow .yam 11 nlg
l ut
C
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12t5 66 s Afr•& D' z (L P P
(1 'Uf /cwtL,,PAN( u� g6" ca-,h.��� vs'c
1 600 CVO P� 'S Cik.0
(P, o f ✓'�-Jt 5 N /-2 WIv 7
(-1 Co "`'_7 ors i A 4 LA 5r(eQ
ZT CAu,Cl f � M;fb
3-
c £c
C14.J w'e S
itW�u IA(A'T
u)oN 7
lit ot,r -rc PeiG
,q3c A o I a b —1 fftS tTi) g2( O
(cot. ram, tiui-4(QfrP1 ) ef-c- ,
--61,6 fi1ZoN of 1' S iu.k'Ron1
4 • c? oN
Cp/'. C P !k - PutAr I t- 5— - Pci-p(Ar c 5i El* 14- s--
4t ut Ink I4S aF L-SoN' 3 'c -k-
PV-7 - .14A ”OfiCW DPI (-14 /1444(4(--
C Pt< 7) Cam( #43a ceuCep � -
gm 004 To C+(ac44- 31197145 6T -r/frrep
pw,,j. p4 / 9 7 .3c51r 4.(6/4 ► Te2 ( off
(n Mi) 7b 'Lk /Lc'r -A-12)25 it,a9p' i s A"l v`f

tofrb (A�„,i c.
fcgortio cot-fY ► 202-- 11° LA1510A9o4
5,x, p P" rr z A)e- w H4`/�
Pc)4" / '1 1 ` - % / d• /
/ et, (ti(3iQ
(4(o� OMf frcold
(PA » i
} um-g- 200$ —; .L3 u1 K pe S(1-Y 07
c666 of Pi Be)
(d+-44T ,AJ ,.c rA c-E

Monthly
Limit
41.7Ibs
Annual
Average
20.85 Ibs
Annual
Average
20.85 Ibs
Annual
Average
20.85 Ibs
Month 1
95.98
X
Aug-06
20
July 07
10
May-07
0
Feb-07
Month 2
47.69
X
Jul-06
20
June 07
10
Apr-07
0
Jan-07
Month 3
14.13
Jun-06
20
May 07
10
Mar-07
0
Dec-06
Month 4
36.14
May-06
20
April 07
10
Feb-07
0
Nov-06
Month 5
25.96
Apr-06
20
March 07
10
Jan-07
0
Oct-06
Month 6
9.59
Mar-06
20
Feb 07
10
Dec-06
0
Sep-06
Month 7
48.76
X
Feb-06
20
Jan 07
10
Nov-06
95.98
Aug-06
Month 8
4.83
Jan-06
20
Dec-06
10
Oct-06
47.69
Jul-06
Month 9
44.12
X
Dec-05
20
Nov-06
10
Sep-06
14.13
Jun-06
Month 10
51.07
X
Nov-05
20
Oct-06
95.98
Aug-06
36.14
May-06
Month 11
37.03
Oct-05
20
Sep-06
47.69
Jul-06
25.96
Apr-06
Month 12
44.8
X
Sep-05
95.98
Aug-06
14.13
Jun-06
9.59
Mar-06
38.34
26.33167
20.65
19.12

EFFLUENT
I4PDES PERMIT NO NC0085359 DISCHARGE NO 001 MONTH OCTOBER YEAR 2006
FACILITY NAME Twelve Mile Creek WWTP CLASS IV COUNTY Union
)PERATOR IN RESPONSIBLE CHARGE (ORC Charles McKoy GRADE IV PHONE: [phone]
CERTIFIED LABORATORIES (1: Union County Labs #575 (2) Pace Lab
CHECK BOX IF ORC HAS CHANGED ❑ PERSON(S) COLLECTING SAMPLES Staff
Mail ORIGINAL and ONE COPY to:
ATM: CENTRAL FILES
DIVISION OF WATER QUALITY
1617 MAIL SERVICE CENTER
RALEIGH, NC 27699-1617
(SIGNATURE OF OPERATOR IN RESPONSIBLE CHARGE)
BY THIS SIGNATURE, I CERTIFY THAT THIS REPORT IS
ACCURATE AND COMPLETE TO THE BEST OF MY KNOWLEDGE.
DATE
GATE
I
8§
`. A
c
o
ORC On Site?*
50050
00010
00400
50060
00310
00610
00530
31616
00300
00600
00665
00095 1 01042 ' 01092 100665
FLOW
TEMPERATURE
CELSIUS
o.
RESIDUAL
CHLORINE
N
Aa
Ao
AMMONIA
NITROGEN
TOTAL
SUSPENDED
RESIDUE
4 11J"
C.; �,'
'�
DISSOLVED
OXYGEN
TOTAL
NITROGEN
Ea
0
c
Hg
ENTER PARAMETER CODE ABOVE NAME
AND UNITS BELOW
EFF
INF E
a.
U
COPPER
I
E
a
ai
A
HRS
HRS
Y/BIN
MGD
°O
UNITS
$K3/L
MGIL
NGIL
MGIL
#MOCYL
MG/L
MGIL
MG/L
Uhmolcm
ugfL
ug/L
//day
1
1000
1
B
2.17
2
0800
8
B
2.19
19.5
7.25
UV
< 2.00
<
1.0
< 2.0
<
1
8.25
4.750
438
86.76
3
0800
8
Y
2.12
19.4
7.29
< 2.00
<
1.0
< 2.0
1
8.51
3.030
448
53.57
4
0800
8
Y
1.93
19.6
7.28
2.62
<
1.0
< 2.0
<
1
8.66
2.940
443
47.32
5
0815
8
Y
2.01
19.8
7.30
< 2.00
<
1.0
< 2.0
1
8.13
3.050
442
51.13
6
0800
8
Y
1.93
18.3
7.26
2.68
<
1.0
< 2.0
<
1
8.1
5.10
1.720
451
< 5.0
78
27.69
7
1100
1
B
2.10
8
1030
1
B
2.11
9
0815
8
Y
2.63
18.8
7.23
2.34
<
1.0
3.3
45
8.63
1.930
437
42.33
10
0800
8
Y
2.21
19.0
7.28
< 2.00
<
1.0
< 2.0
46
7.74
1.260
432
23.22
11
0800
8
Y
1.99
l 19.4
7.22
< 2.00
<
1.0
< 2.0
76
8.88
0.929
431
15.42
12
0800
8
Y
2.26
19.7
7.22
< 2.00
<
1.0
< 2.0
42
7.37
1.100
439
20.73
13
0800
8
Y
2.02
19.5
7.20
< 2.00
<
1.0
3.2
46
7.73
3.60
1.620
433
< 5.0
73
27.29
14
0945
1
B
2.08
15
0830
1
B
1.84
16
0940
8
Y
2.31
18.8
7.08
< 2.00
<
1.0
< 2.0
1
7.88
1.530
455
29.48
17
0900
8
Y
2.81
19.0
7.17
< 2.00
<
1.0
< 2.0
3
8.46
` 0.568
446
13.31
18
0830
8
Y
3.00
19.4
7.07
< 2.00
<
1.0
< 2.0
2
8.06
0.298
427
7.46
19
0800
8
Y
3.71
19.2
7.00
2.94
<
1.0
2.8
2
8.01
0.257
402
7.95
20
0800
8
Y
4.36
19.3
7.34
2.08
<
1.0
5.8
3
8.28
0.650
432
23.64
210900
1
Y
2.68
22
0700
1
Y
1.98
23
0800
8
Y
2.59
18.4
7.37
<
1.0
17.1
1
7.04
462
24
0815
8
Y
2.17
18.1
7.08
1.1
3.8
13
8.18
448
25
0800
8
Y
2.13
17.4
7.00
<
1.0
< 2.0
8.75
438
26
27
28
29
30
v
31
AVERAGE
2.37
19.0
0.84
0.1
2.4
5
8.15
4.35
1.709
439
0.0
76
33.82
MAXIMUM
4.36
19.8
7.37
2.94
1.1
17.1
76
8.88
5.10
4.750
462
< 5.0
78
86.76
MINIMUM
1.84
17A
7.00
< 2.00
<
1.0
< 2.0
<
1
7.04
3.60
0257
402
< 5.0
73
7.46
Comp.(C)/Grab(G)
G
G
G
C
C
C
G
G, C
C
G
C
C
C
Monthly Limit
2.50
6-9
17.0
5.00
2.0
30.0
200
>6
18.5
175
41.70
Monthly Avg. % Removal (85%)
#REFI
#REF!
DWQ Form MR-1 (01/00)

Facility: Union Co.
Discharge to: 12 Mile Creek
Residual Chlorine
7Q10 (CFS)
DESIGN FLOW (MGD)
DESIGN FLOW (CFS)
STREAM STD (UG/L)
UPS BACKGROUND LEVEL (UG/L)
IWC (%)
Allowable Conc. (ug/I)
Fecal Limit
Ratio of 0.0 :1
DA = 76.8 mi2
7Q10s = 0.1 cfs
7Q10w = 1.5 cfs
Ammonia as NH3
(summer)
0.1 7Q10 (CFS)
6. DESIGN FLOW (MGD)
9.3 DESIGN FLOW (CFS)
17.0 STREAM STD (MG/L)
0 UPS BACKGROUND LEVEL (MG/L)
98.94 IWC (%)
17.18 Allowable Concentration (mg/I)
200/100mI
Ammonia as NH3
(winter)
7Q10 (CFS)
DESIGN FLOW (MGD)
DESIGN FLOW (CFS)
STREAM STD (MG/L)
UPS BACKGROUND LEVEL (MG/L)
IWC (%)
Allowable Concentration (mg/I)
For Minor domestic -type facilities:
Minimum of 2 mg/I (summer) NH3-N; 4 mg/I (winter) NH3-N
Chlorine:
Residual chlorine must be capped at 28 ug/I to protect for acute toxicity effects
0.1
6
9.3
1.0
0.22
98.94
1.01
1.5
6
9.3
1.8
0.22
86.11
2.05

Facility: Union Co.
Discharge to: 12 Mile Creek
Residual Chlorine
7Q10 (CFS)
DESIGN FLOW (MGD)
DESIGN FLOW (CFS)
STREAM STD (UG/L)
UPS BACKGROUND LEVEL (UG/L)
'IWC (%)
Allowable Conc. (ug/l)
Fecal Limit
Ratio of 0.0 :1
DA = 76.8 mi2
7Q10s = 0.1 cfs
7Q10w = 1.5 cfs
Ammonia as NH3
(summer)
0.1 7Q10 (CFS)
2.5 DESIGN FLOW (MGD)
3.875 DESIGN FLOW (CFS)
17.0 STREAM STD (MG/L)
0 UPS BACKGROUND LEVEL (MG/L)
97.48 IWC (%)
17.44 Allowable Concentration (mg/I)
200/100mI
Ammonia as NH3
(winter)
7Q10 (CFS)
DESIGN FLOW (MGD)
DESIGN FLOW (CFS)
STREAM STD (MG/L)
UPS BACKGROUND LEVEL (MG/L)
IWC (%)
Allowable Concentration (mg/I)
For Minor domestic -type facilities:
Minimum of 2 mg/I (summer) NH3-N; 4 mg/I (winter) NH3-N
Chlorine:
Residual chlorine must be capped at 28 ug/I to protect for acute toxicity effects
0.1
2.5
3.875
1.0
0.22
97.48
1.02
1.5
2.5
3.875
1.8
0.22
72.09
2.41

k0001011
V's�� r
000
deleterious substances, colored or
other wastes, except those given in
a. above.
c. Toxic pollutants listed in
the appendix.
d. Stormwater and other nonpoint
source runoff, including that from
agricultural uses, or permitted
discharge from aquatic farms,
concentrated aquatic animal
production facilities, and
uncontaminated groundwater from
mining.
e. Dissolved oxygen.
f. Fecal coliform.
g. pH.
h. Temperature.
i. Turbidity.
with other substances or wastes in
sufficient amounts to be injurious
to reproducing trout populations
in natural waters or stocked
populations in put, grow, and take
waters or in any manner adversely
affecting the taste, color, odor, or
sanitary condition thereof or
impairing the waters for any other
best usage as determined for the
specific waters which are assigned
to this class.
As prescribed in Section E.
of this regulation.
Allowed if water quality
necessary for existing and
classified uses shall be maintained
and protected consistent with
Antidegradation Rules.
Not less than 6 mg/1.
Not to exceed a geometric mean
of 200/100 ml, based on five
consecutive samples during any
30 day period; nor shall more
than 10% of the total samples
during any 30 day period exceed
400/100m1.
Between 6.0 and 8.0.
Not to vary from levels existing
under natural conditions, unless
determined that some other
temperature shall protect the
classified uses.
Not to exceed 10 Nephelometric
Turbidity Units (NTUs) or 10%
above natural conditions,
provided existing uses are
maintained.
10. Freshwaters (FW) are freshwaters suitable for primary and secondary contact recreation and as a
source for drinking water supply after conventional treatment in accordance with the
26

(biro/4 C° Z Air L G
p.a. ,-;76.g 0.13Z
10.05 6.1
17490./ s c4 p1/4,4 - 7Z.7 Q4
/U40 346 = 97 Ca
PP" = 2.S,,
Ng_
2
r
Cc-6. = /Z.$
‘- o 11A4P ,l7/C =
3I4 65.69 �-C- u Son• ail uT/ofI &6P/ i
rio v/Ltc_rlon! cox_ C.4.6-
PF 6. 0 ivs s�l
LY �J°
/3.6 /S .S
/72
G (.& 3,o i>J .�5 � �. q8 2
Cik /3 1 /63-
f7�

[Fwd: NG DWQ and Union County Meeting]
U„NImN co,
Subject: [Fwd: NC DWQ and Union County Meeting]
From: Bob Sledge <bob. sledge cr ncmail.net>
Date: Thu, 19 Oct 2006 08:58:20 -0400
To: Susan Wilson <[e-mail]>
Here's some info Jim Struve just passed along about w
next Thursday. You/we can vent about the topics later
Bob
Original Message
Subject: NC DWQ and Union County Meeting
Date: Thu, 19 Oct 2006 08:27:44 -0400
From: "Struve, James N." <[e-mail]>
To: <[e-mail]>
CC: <[e-mail]>
Good Morning Bob,
lk about
I have confirmed with Mark Tye of Union County of his availability to meet with you
and your staff next Thursday (October 26th) at 10:00 AM.
The purpose of this meeting is to have an informal discussion regarding several items
(refer to below). Feedback and guidance from your department would be greatly
appreciated.
Items for discussion include:
1. Clarification of recently issued Cu and Zn limits. Why do the Cu and Zn
limits change with increasing plant flow rate from 2.5 mgd to 6 mgd?. 12-Mile
Creek's 7Q10 flow is 0 cfs. As a result, it was our understanding that metal limits
should not change with increasing plant flow. Vgal l►,ri101
0- 271tk,UT1o1J
2. Plan for interim rerating of the 12-Mile Creek WWTP from 2.5 mgd to
approximately 3 mgd following completion of the Phase 1 Improvements currently under
construction. Improvements are tentatively scheduled for completion by March 1,
2007.
3. Update on actions undertaken by Union County to bring 12-Mile Creek WWTP
into compliance with phosphorus limit.
4. Request for waiver of 24/7 operator staffing until annual average flow
exceeds 5 mgd. SCADA improvements are currently being implemented which will notify
Union County of any alarm conditions and allow ORC to monitor facility remotely.
140
5. Permit modification to increase fecal coliform daily maximum limit from 400
CFU/100 ml to 1,000 CFU/100 ml.
1 of 2 10/19/2006 4:04 PM

[Fwd: NC DWQ and Union County Meeting]
For your information, Mark Tye of Union County and Mike Parker of the Mooresville
Regional Office have recently met to discuss these items as well.
We look forward to seeing you all next Thursday.
Regards,
Jim
James N. Struve, P.E.
Senior Associate
Hazen and Sawyer, P.C.
4944 Parkway Plaza Boulevard, Suite 375
Charlotte, NC 28217
Office [phone]
Direct [phone]
Fax [phone]
Email [e-mail]<mailto:[e-mail]>
2 of 2 10/19/2006 4:04 PM

HAZEN AND SAWYER
Environmental Engineers & Scientists
October 31, 2006
Ms. Susan Wilson
Western NPDES Supervisor
NC Division of Water Quality
1617 Mail Service Center
Raleigh, NC 27699-1617
Re: Union County, NC
Twelve Mile Creek WWTP
Request for Interim Rerating
Dear Ms. Wilson:
Hazen and Sawyer, P.C.
4944 Parkway Plaza Blvd.
Suite 375
Charlotte, NC 28217
704 357-3150
Fax: [phone]
On behalf of Union County Public Works Department, Hazen and Sawyer is requesting a
revised NPDES Effluent Limitations page for the County's Twelve Mile Creek WWTP
(Permit No. NC0085359). High demand within the Twelve Mile Creek's service area
has necessitated this request.
The plant is currently undergoing a construction project which will expand the plant's
capacity from 2.5 to 6.0 mgd. The overall project is ahead of schedule and is slated to
be substantially complete by late summer/early fall 2007. An environmental assessment
for this project has already been performed and approved, and an NPDES Permit for a
design flow of 6.0 mgd has also been issued.
The construction documents stipulate interim substantial completion dates. Phase 1
improvements are scheduled to be on line by March 1, 2007. Improvements include:
• Expanded Influent Pump Station (firm capacity of 15.0 mgd)
• One (1) New MLSS Distribution Box
• Two (2) New 85-Foot Secondary Clarifiers
• New RAS and Was Pumping Stations
• One (1) New 1 MG Aerobic Digester
• New Standby Power Facilities
With the substantial completion of the Phase 1 improvements, the plant will be capable
of treating an additional 0.5 mgd of flow. A process and hydraulic rerating evaluation will
be prepared by Hazen and Sawyer confirming the plants ability to treat a design flow of
3.0 mgd with the substantial completion of the Phase 1 improvements. This evaluation
will be submitted for regulatory review by December 1, 2006.
For the interim rerating to 3.0 mgd; it is anticipated that the County will be required to
meet the effluent limitations and monitoring requirements as stipulated in their NPDES
Permit for a design flow of 6.0 mgd. Selected parameters and their associated limits are
summarized on the following page:
New York, NY • Armonk, NY • Upper Saddle River, NJ • Raleigh, NC • Charlotte. NC • Vienna, VA • Hollywood, FL • Boca Raton, FL • Fort Pierce, FL • Jupiter, FL • Miami, FL • Bogota, O.E. Colombia

Ms. Susan Wilson
October 31, 2006
Page 2
Effluent Limitation
Monthly Weekly Daily
Parameter Average Average Maximum
Flow, mgd 3.0
BOD5 (Summer), mg/L 5.0 7.5
BOD5 (Winter), mg/L 10.0 15.0
NH3-N (Summer), mg/L 1.0 3.0
NH3-N (Winter), mg/L 2.0 6.0
TSS, mg/L 30.0 45.0
TP TMDL, Ib/d Monthly Average 47.70
Twelve Month Average 20.85
Fecal Coliform, FCU/100 mL 200 400
We look forward to receiving the revised NPDES Effluent Limitations page for an interim
design flow of 3.0 mgd. Should you require additional information or clarification to
facilitate this request, please do not hesitate to call me at [phone] or e-mail me at
[e-mail].
Very truly yours,
HAZEN AND SAWYER, P.C.
James N. Struve, P.E
Senior Associate
cc: Cecil Madden, DWQ CG&L Section
Mark Tye, Union County Public Works
Ron Taylor, Hazen and Sawyer
Joe Rohrbacher, Hazen and Sawyer
Mike Parker, Hazen and Sawyer