NC0024970_Permit Modification_20140707

NPDES DOCIMENT SCANNIN` COVER SHEET
NC0024970
McAlpine Creek WWTP
NPDES Permit:
Document Type:
Permit Issuance
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Complete File - Historical
Engineering Alternatives (EAA)
Correspondence
Owner Name Change
Draft Permit
Instream Assessment (67b)
Speculative Limits
Environmental Assessment (EA)
Document Date:
July 7, 2014
Thies document is printed oat reuse paper - iggaore ataxy
context on the res erse side

AVA
NCDENR
North Carolina Department of Environment and Natural Resources
Pat McCrory John E. Skvarla, III
Governor Secretary
July 7, 2014
Ms. Jacqueline A. Jarrell, P.E.
Operations Chief - Wastewater
Charlotte -Mecklenburg Utility Department
4222 Westmont Drive
Charlotte, North Carolina 28217
Subject: Permit Monitoring Modification
Permit No. NC0024970
McAlpine Creek WMF
Mecklenburg County
Facility Class IV
Dear Ms. Jarrell:
Division personnel have reviewed and approved your application for a minor modification
of the subject permit. We are forwarding you the new Section A.(1.) Effluent Limitations
and Monitoring Requirements page with footnotes. You should replace your existing
Effluent Limitations and Monitoring Requirements sheet with this revised page, effective
8/1/2014. This permit revision is issued pursuant to the requirements of North Carolina
General Statute 143-215.1 and the Memorandum of Agreement between North Carolina and
the U.S. Environmental Protection Agency dated October 15, 2007 (or as subsequently
amended).
DWR guidance regarding the reduction of monitoring frequencies in permits for
exceptionally performing facilities is for NPDES permits only and do not apply to reclaimed
water permits. Please contact Jon Risgaard in the Non -Discharge Permitting Unit if you are
interested in obtaining similar monitoring frequency reductions related to reclaimed water
use.
The changes made in this permit modification include:
• Monitoring frequency reductions for CBOD, TSS, NH3-N, and Fecal Coliform from
daily to twice per week.
The receiving stream, McAlpine Creek, is listed as an impaired waterbody on the North Carolina
303(d) Impaired Waters List. There is an EPA approved Fecal Coliform Total Maximum Daily
Load (TMDL) for the Irwin, McAlpine, Little Sugar, and Sugar Creek Watersheds. Addressing
impaired waters is a high priority with the Division, and instream data will continue to be evaluated.
If there is noncompliance with permitted effluent limits and stream impairment can be attributed to
your facility, then mitigative measures may be required.
1617 Mail Service Center, Raleigh, North Carolina 27699-1617
Phone: [phone] Internet: www.ncwaterquality.org
An Equal Opportunity 1 Affirmative Action Employer — Made in part by recycled paper

Ms. Jacqueline A. Jarrell, P.E.
July 7, 2014
Page 2 of 2
If any parts, measurement frequencies or sampling requirements contained in this permit are
unacceptable to you, you have the right to an adjudicatory hearing upon written request within thirty
(30) days following receipt of this letter. This request must be in the form of a written petition,
conforming to Chapter 150B of the North Carolina General Statutes, and filed with the Office of
Administrative Hearings (6714 Mail Service Center, Raleigh, North Carolina 27699-6714). Unless
such 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
Resources 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 Julie Grzyb by email
([e-mail]) or phone at [phone].
Sincerely,
Vl ( uk.
G
homas A. Reeder, Director
Division of Water Resources, NCDENR
Enclosure: NPDES Permit NC0024970 (Modified pages)
cc: NPDES Unit
Central Files
Mooresville Regional Office/Water Quality Operations
e-copy:
EPA, Region IV
Erin Hall. Mecklenburg County
r

Permit NC0024970
A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
During the period beginning on the effective date of this 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:
EFFLUENT
CHARACTERISTICS
"LIMITS
MONITORING REQUIREMENTS
Monthly
Average
Weekly
Average
Daily
Maximum .. ;
Measurement
, Frequency, .,
Sample
.. Type , ,
Sample
'Locations
Flow
64.0 MGD
Continuous
Recording
I or E
CBOD, 5-day (20°C)2
April 1- October 31
4.0 mg/L
6.0 mg/L
Twice per week
Composite
E, I
CBOD, 5-day (20°C)2
November 1- March 31
8.0 mg/L
12.0 mg/L
Twice per week
Composite
E, 1
Total Suspended Solids2
15.0 mg/L
22.5 mg/L
Twice per week
Composite
E, I
NH3 as N
(April 1- October 31)
1.0 mg/L
3.0 mg/L
Twice per week
Composite
E
NH3 as N
(November 1-March 31)
1.9 mg/L
5.7 mg/L
Twice per week
Composite
E
Fecal Coliform
(geometric mean)
200 / 100 ml
400 / 100 ml
1000 / 100 ml
Twice per week
Grab
E
pH
Between 6.0 and 9.0 S.U.
' Daily
Grab
E
Dissolved Oxygen3
Daily
Grab
E, U, D
Conductivity
Daily
Grab
E, U, D
Temperature (°C)
Daily
Grab
E, U, D
Total Residual Chlorine4,5
17 µg/L
Daily
Grab
E
Total Copper
Quarterly
Composite
E
Total Mercury
Quarterly
Composite
E
Total Zinc
Quarterly
Composite
E
Dichlorobromomethane
Quarterly
Grab
E
Total Nitrogen
(NO2 + NO3 + TKN)
Monthly
Composite
E
Total Phosphorus6
1,067 lbs/day
Monthly
Composite
E
Chronic Toxicity?
Quarterly
Composite
E
Effluent Pollutant Scans
Annual
Grab
E
Footnotes:
1. Sample Locations: E - Effluent, I - Influent, U - Upstream, D- Downstream. For instream monitoring
requirements, see Parts A. (5.)- A. (8.).
2. The monthly average effluent CBOD5 and total suspended solids concentrations shall not exceed 15% of the
respective influent value.
3. The daily average dissolved oxygen effluent concentrations shall not be less than 6.0 mg/L.
4. The daily average limit for total residual chlorine shall be 28 µg/L.
5. The Division shall consider all effluent total residual chlorine values reported below 50 µg/I to be in compliance
with the permit. However, the Permittee shall continue to record and submit all values reported by a North
Carolina certified laboratory (including field certified), even if these values fall below 50 µg/l.
NPDES Permit Part I - Page 3 of 13
(effluent monitoring revised 7/ 7/ 2014)

Permit NC0024970
6. The three CMUD plants (McAlpine, Irwin and Sugar Creek WWTPs) shall have a combined 12-month rolling
average phosphorus limit of 826 lbs/day. See Part A. (2.). for additional information on this limit. Part A. (3.)
describes the methodology for calculation of the monthly average and 12-month limits.
7. Whole effluent toxicity shall be measured by Chronic Toxicity (Ceriodaphnia) P/F at 90 %. Samples shall be taken
quarterly during the months of March, June, September and December. See Part A. (4).
8. See Special Conditions A. (9) of the Supplement to Effluent Limitations.
There shall be no discharge of floating solids or foam visible in other than trace amounts.
A. (2.) TOTAL PHOSPHORUS LIMIT
As stipulated by the 2002 Settlement Agreement between Charlotte -Mecklenburg Utilities Department
(CMUD), the South Carolina Department of Health and Environmental Control (SC DHEC) and the North
Carolina Division of Water Quality (NC-DWQ), CMUD's McAlpine Creek WWMF, Sugar Creek WWTP and
Irwin Creek WWTP must comply with a combined 12 month rolling average limit of 826.0 lbs/day as of
February 28, 2006. This limit is defined as an effluent limit for total phosphorus from the total combined
discharge from the three referenced CMUD wastewater treatment plants (based on a 12-month rolling average)
The methodology for calculating the annual average is described in Part A. (3.).
A. (3.) TOTAL PHOSPHORUS 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 (lbs. /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 (lbs./ day)= E 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 and
submitted with the discharge monitoring report for McAlpine Creek WWMF. The first worksheet is due with
the discharge monitoring report, 12 months from the effective date of the total phosphorus limit (referenced in
Special Condition A. (2)). In the interim period between the effective date and the requirement to submit the
attached worksheet, the total phosphorus monthly average mass loadings should be reported on the discharge
monitoring report for the respective facility.
The Permittee shall report the total phosphorus concentration for each sample on the appropriate discharge
monitoring report for each facility. Reporting of and compliance with the phosphorus limit shall be done on a
monthly basis.
NPDES Permit Part I - Page 4 of 13
(effluent monitoring revised 7/ 7/ 2014)

NPDES - Monitoring Reduction Frequency Evaluation (JAG)
CMUD - MCAlpine Creek WMF NC0024970
Fecal Coliform (2011-3/2014)
1) 25 geo avg
< 100/100mL or 50 % of the monthly permit limit
2) 200% of 400/100 mL weekly avg limit = 800/100mL
2011 0 2012 0 2013-3/2014 0
no daily samples > 200% of permit limit
< 20 daily samples exceeded 200% of the 400/100 mL permit limit
3) no more than two weekly average limit violations in 2013-3/2014 (none on record)
Reduce monitoring Frequency for fecal coliform to 2/week
TSS (2011-3/2014)
1) 15 mg/L monthly average permit limit
7.5 = 50% of monthly average permit limit
2.7 three-year average is < 50% of the monthly average permit limit
2) 200% of monthly average permit limit= 30 mg/L
2011 0 2012 0 2013-3/2014 0
no daily samples exceeded 200% of the monthly average limit
3) no more than two weekly average limit violations in 2013-3/2014 (none on record)
Reduce Monitoring Frequency for TSS to 2lweek
NH3-N
1)
(2011-3/2014)
7/12*1 mg/L + 5/12'1.9 mg/L = 1.35 mg/L weighted, annual monthly average
0.675 = 50% of wt. annual monthly average
0.109 three-year average is < 50% of the weighted annual monthly average limit
2) 200% of summer monthly avg. limit = 2 mg/L summer values > 2
2011 0 2012 0 2013-3/2014 0
11 daily samples exceeded 200% of the monthly average summer limit
200% of winter monthly permit limit = 3.8 mg/L winter values > 3.8
2011 0 2012 0 2013 0
0 0 0
no daily samples exceeded 200% of monthly average winter limit
Total - no daily samples exceeded 200% of the monthly summer and winter averages (15 allowed)
3) no more than two weekly average limit violations in 2013-3/2014 (none shown)
Reduce Monitoring Frequency for NH3-N to 2/week
CBOD (2011-3/2014)
1) 7/12*4 mg/L + 5/12*8 mg/L = 5.67 mg/L weighted, annual monthly average
2.83 = 50% of wt. annual monthly average
2.39 2.39 three-year average is < 50% of the weighted annual monthly average limit
2) 200% of summer monthly avg. limit = 8 mg/L summer values > 8
2011 2 2012 0 2013 0
2 daily samples exceeded 200% of the monthly average summer limit
200% of winter monthly permit limit = 16 mg/L winter values > 16
2011 0 2012 0 2013 0 2014 0
no daily samples exceeded 200% of monthly average winter limit
only 15 exceedances allowed - 2 accounted for
3) no more than two weekly average limit violations in 2013 (none on record)
Reduce Monitoring Frequency for CBOD5 to 2lweek

•-
cm,
(I I AR1 flT"TE
May 1st, 2014
NPDES Permitting Unit
NC-DWR
1617 Mail Service Center
Raleigh, NC 27699-1617
CITY OF CHARLOTTE
CHARLOTTE-MECKLENBURG UTILITIES
Environmental Management
RECEIVED/DENR/DWR
MAY 3 0 2014
Water Resources
Permitting Section
Re: Request for Reduced Monitoring Frequencies for Exceptionally Performing Facilities —
McAlpine Creek WWMF — NPDES Permit #NC0024970
E pires z../ /Loi 10
Dear NPDES Unit:
Please consider this letter as Charlotte -Mecklenburg Utility Department's request for a minor modification to
McAlpine Creek's NPDES permit. We are requesting a reduction of monitoring frequencies for CBOD, TSS,
NH3, and fecal coliform since McAlpine Creek WWMF exceeds the criteria for an exceptionally performing
facility as outlined in the Division of Water Quality's guidance.
Enclosed is the three year data summary of McAlpine Creek WWMF's effluent data and DWQ's criteria.
Please note that even if our request is approved, the Utility Department will likely continue to monitor at a
frequency greater than what would be required based on our exceptional history of compliance with these
parameters. If you would like a copy of the raw data set please let us know and we will make it available to
you at your request.
Please also let us know if you have any questions or if you need any further information. If you do, please
call Shannon Sypolt, Water Quality Program Administrator, at 704/336-4581 or Kim Neely, ORC of McAlpine
Creek WWMF, at 704/634-3512. You may also contact me at 704/336-4460. Thank you for your
assistance with this modification.
Respectfully,
pacq line A. Jarrell, P.E.
l...,Operations Chief - Wastewater
Charlotte -Mecklenburg Utility Department
Cc: K. Neely, S. Sypolt
www.charlottenc.gov 14222 Westmont Drive I Charlotte. NC 28217 I PH: 704.336.4407

Data Summary for Reduced NPDES Permit Monitoring Frequency
Data Results and Approval Criteria for McAlpine Creek WWMF
Data Set - March 1, 2011 - February 28, 2014
Parameters Monthly Weekly # of 3- Year 50% of # of Results > 200 % # of Results > 200 % Max Daily
Limits Limits Samples Results Monthly monthly average weekly average (fecal Result
Average Limit (CBOD, TSS, NH3) coliform)
CBOD
Summer
4
6
456
1.4
2
2 of 15
N/A
11
Winter
8
12
311
1.3
4
0 of 15
N/A
8.9
NH3
Summer
1
3
456
0.026
0.5
0 of 15
N/A
0.92
Winter
1.9
5.7
311
0.012
0.95
0 of 15
N/A
0.44
TSS
15
22.5
767
Fecal Coliform
200
400
757
Approval Criteria Met:
0.263
7.5
0 of 15
N/A
26
100
N/A
0 of 20
7.9
650
1) This facility has not received a civil penalty for a permit violation of the target parameters in the last three years
2) Neither the permitee nor any of its employees have been convicted of criminal violation of the CWA with the previous five years
3) This facility is not under an SOC for target parameter effluent limit noncompliance
4) This facility is not on EPA's Quarterly Noncompliance Report for target parameter limit violations
5) This facility's three year arithmetic mean is less than fifty percent of the monthly average permit limit for CBOD, TSS, and NH3-N
6) This facility's three year geomean is less than fifty percent of the monthly average permit limit for fecal coliform
7) Less than 15 daily sampling results over the three year review period are in excess of 200% of the monthly average for CBOD, TSS, and NH3
8) Less than 20 daily sampling results over the three year review period are in excess of the 200% of the weekly average for fecal coliform
9) This facility has not received any non -monthly average limit violations in the past year for the four target parameters