NC0048879_Permit (Issuance)_20140328

NPDES DOCUMENT SCANNING COVER SKEET
NPDES Permit:
NC0048879
Cary North 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:
March 28, 2014
This document is printed on reuse paper - ignore any
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North Carolina Department of Environment and Natural Resources
Division of Water Resources
Pat McCrory Thomas A. Reeder John E. Skvarla, III
Governor Director Secretary
March 28, 2014
Mr. Jamie Revels, Utility Director
Town of Cary Public Works and Utilities Department
P.O. Box 8005
Cary, North Carolina 27512-8005
Subject:
Dear Mr. Revels:
Issuance of NPDES Permit NC0048879
North Cary WRF
Wake County
Facility Class IV
Division personnel have reviewed and approved your application for renewal of the subject
permit. Accordingly, we are forwarding the attached NPDES discharge permit. This permit
is issued pursuant to the requirements of North Carolina General Statute 143-215.1 and the
Memorandum of Agreement between North Carolina and the U.S. Environmental Protection
Agency dated October 15, 2007 (or as subsequently amended).
The following items are in response to the comment letter received from the Town of
Cary on February 21, 2014.
• The expiration date of Feb. 28, 2018 coincides with other NPDES permit holders in
Wake County in the Neuse River Basin. The expiration date is maintained in the
issued permit.
• The Component list was corrected as requested.
• The reported lead value of 0.064 mg/L on Jan. 31, 2012 was corrected to <0.010 mg/L.
Using the revised effluent data, the Reasonable Potential Analysis (RPA) showed no
potential to violate the water quality standard for total lead. The lead limitations and
monitoring requirements were removed from the permit.
• The letter from Pace Analytical laboratory was considered and the one cyanide effluent
sample at 0.011 mg/L was removed from the RPA data calculation. No reasonable potential
was shown for a cyanide violation in the revised RPA. Cyanide limits and monitoring were
removed from the permit.
• The request to reduce the instream monitoring requirements was not granted. River Basin
Associations are afforded different monitoring schedules because of their work in helping to
1617 Mail Service Center, Raleigh, North Carolina 27699-1617
Location: 512 N. Salisbury St Raleigh, North Carolina 27604
Phone: [phone] FAX: [phone]
Internet www.ncwateraualfi+.orq
NOne Carolina
Xaturaflij
An Equal opportunity 1 Affirmative Action Employer

Page 2 of 3
improve and assess the entire Basin watershed. Point source monitoring is regulated under
15A NCAC 2B .0500 and participation in the LNBA is what waives the facility's
requirement to perform individual instream sampling..
• The additional language cited in the last permit under the Chronic Toxicity Permit
Limit special condition is contained in the "North Carolina Phase II Chronic Whole
Effluent Toxicity Test Procedure" (Revised -February 1998). This test procedure is
cited throughout the special condition and the extra wording was thought to be
unnecessary.
• As long as the Town samples copper and zinc quarterly in conjunction with toxicity
testing, and the sample being collected is representative of the wastewaters being
discharged, either day that the chronic samples are being collected are adequate for
metal sampling.
• The suggested wording on the sampling and reporting of data was inserted into the
Chronic Toxicity Permit Limit special condition.
• The request to insert a special condition specifying the EPA requirement that
multiple species be tested and the results submitted with the permit renewal
application was added.
• The Mercury Minimization Plan (MMP) requirement is part of the 2012 Statewide Mercury
TMDL and NPDES Permitting Implementation Plan that was reviewed and approved by US
EPA. The MMP is required to be maintained in the permit.
Please note that the MMP shall be developed by October 28, 2014 (within 180 days of the
NPDES Permit effective date). A sample MMP was developed through a stakeholder review
process and has been placed on the Division website for guidance at:
http://portal.ncdenr.org/web/wq/swp/ps/npdes.
• As requested, the wording in the fact sheet on the Pretreatment Program was modified.
The final permit contains the following significant changes from your current permit:
• The Town of Cary's request for reduced sampling for BODS, NH3-N, Fecal Coliform, and TSS
from daily to twice per week in accordance with the Reduction of Monitoring Frequencies in
NPDES Permits for Exceptionally Performing Facilities (Oct. 22, 2012) was approved and the
permit revised accordingly.
• Effluent sampling data for copper and zinc showed reasonable potential to violate Water Quality
Standards. Since both of these parameters have action level standards, no limits were put in the
permit. However, quarterly monitoring for both parameters was added and shall be performed in
conjuction with Whole Effluent Toxicity (WET) tests.
• Fluoride effluent data showed reasonable potential to violate Water Quality Standards (WQS).
Permit limitations and monthly monitoring requirements were added in the permit.
• The requirement to begin reporting discharge monitoring data electronically using the NC
DWR's Electronic Discharge Monitoring Report (eDMR) Internet application has been added to
your NPDES permit. [See Special Condition A. (10.)] We recognize the Town is already
submitting eDMR's and in compliance with this requirement.
For information on eDMR, registering for eDMR and obtaining an eDMR user account, please
visit the following web page: http://portal.ncdenr.org/web/wq/admin/bog/ipu/edmr.

Page 3 of 3
For information on EPA's proposed NPDES Electronic Reporting Rule, please visit the
following website: http://www2.epa.gov/compliance/proposed-npdes-electronic-reporting-rule.
• In accordance with the 2012 Statewide Mercury TMDL, the requirement to perform a Mercury
Minimization Plan (MMP) was added to the permit. See MMP Special Condition A.(11.).
• Some of the wording has changed in Section A. (5.), Chronic Toxicity Permit Limit, please
review each paragraph carefully.
• Section A. (9.) on the Effluent Pollutant Scan now designates the three years in which the scans
are to be performed. Please review this condition.
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 fmal 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,
eir Thomas A. Reeder
Enclosure: NPDES Permit NC0048879
cc: NPDES Unit
Central Files
Raleigh Regional Office/Water Quality
e-copy:
EPA, Region IV
Susan Meadows, Aquatic Toxicity Branch
Carrie Ruhlman, WSS/Ecosystems Branch
Ed Duke, Wake County
Paul Ray, North Cary WFR Manager

Permit NC0048879
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER RESOURCES
PERMIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
In compliance with the provisions 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
Town of Cary
is hereby authorized to discharge wastewater from facilities located at the
North Cary Water Reclamation Facility
1900 Old Reedy Creek Road
Cary
Wake County
to receiving waters designated as Crabtree Creek in the Neuse River Basin
in accordance with the effluent limitations, monitoring requirements, and other conditions set forth in
Parts I, II, III, and IV hereof.
This permit shall become effective May 1, 2014.
This permit and the authorization to discharge shall expire at midnight on February 28, 2018.
Signed this day ..March 28, 2014
comas A. Reeder, Director
dizi Division of Water Resources
By Authority of the Environmental Management Commission
Page 1 of 12

Permit NC0048879,,
4
SUPPLEMENT TO PERMIT COVER SHEET
All previous NPDES Permits issued to this facility, whether for operation or discharge are hereby revoked. As of this
permit issuance, any previously issued permit bearing this number is no longer effective. Therefore, the exclusive
authority to operate and discharge from this facility arises under the permit conditions, requirements, terms, and
provisions included herein.
The Town of Cary
is hereby authorized to:
1. Continue operation of a 12.0 MGD water reclamation facility that includes the following
components:
• Mechanical screening
• Influent pump station
• Grit and grease removal system
• Nutrient removal system consisting of anaerobic selectors, oxidation ditches, anoxic zones and
reaeration zones
• Dual secondary clarifiers
• Deep -bed sand filters
• Ultraviolet disinfection
• Cascade aeration
• Belt thickeners
• Aerated holding tanks
This facility is located at the North Cary Water Reclamation Facility (1900 Old Reedy Creek Road,
Cary) in Wake County.
2. Operate facilities for bulk and reclaimed water distribution in accordance with Non -Discharge
Permit WQ0017923.
3. Discharge from said treatment works at the location specified on the attached map into Crabtree
Creek, a class B-NSW water in the Neuse River Basin.
Page 2 of 12

Permit NC0048879
A(1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
Beginning on the effective date of this permit and lasting until expiration, the Permittee is authorized to
discharge treated wastewater from Outfall 001. Such discharges shall be limited and monitored1 by the
Permittee as specified below:
PARAMETER
EFFLUENT LIMITATIONS
MONITORING REQUIREMENTS
Monthly
Average
Weekly
Average
Daily
Maximum
Measurement
Frequency
Sample
Type
Sample Location 2
Flow
12.0 MGD
Continuous
Recording
Influent or Effluent
Total Monthly Flow(MG)
Monitor & Report
Monthly
Recorded or
Calculated
Influent or Effluent
CBOD5 (Summer)3'4
4.1 mg/L
6.0 mg/L
Twice per week
Composite
Influent & Effluent
CBOD5 (Winter)3,4
8.2 mg/L
12.3 mg/L
Twice per week
Composite
Influent & Effluent
Total Suspended Solids3
30.0 mg/L
45.0 mg/L
Twice per week
Composite
Influent & Effluent
NH3 as N (Summer)4
0.5 mg/L
1.5 mg/L
.
Twice per week
Composite
Effluent
NH3 as N (Winter)4
1.0 mg/L
3.0 mg/L
Twice per week
Composite
Effluent
Dissolved Oxygen
Daily average not less than 5.0 mg/L
Daily
Grab
Effluent
Fecal Coliform
200/100 mL
400/100 mL
Twice per week
Grab
Effluent
Temperature
Monitor & Report
Daily
Grab
Effluent
-TKN (mg/L)
Monitor & Report
Weekly
Composite
Effluent
-NO3-N + NO2-N (mg/L)
Monitor & Report
Weekly
Composite
Effluent
TN (mg/L)5
Monitor & Report
Weekly
Composite
Effluent
TN Load6
Monitor & Report
143,246 pounds per year'
Monthly
Annually
Calculated
Calculated
Effluent
Effluent
Total Phosphorus
2.0 mg/L (quarterly average)8
Weekly
Composite
Effluent
pH
Between 6.0 and 9.0 Standard Units
Daily
Grab
Effluent
Total Fluoride
1,830 pg/L
Monitor &
Report
Monthly
Composite
Effluent
Total Copper9
Monitor and Report (pg/L)
Quarterly
Composite
Effluent
Total Zinc9
Monitor and Report (pg/L)
Quarterly
Composite
Effluent
Whole Effluent Toxicity10,11
Monitor and Report
Quarterly
Composite
Effluent
Effluent Pollutant Scan
Monitor and Report
Footnote 12
Footnote 12
Effluent
All footnotes are listed on the following page.
Page 3 of 12

Permit NC0048879„
Footnotes:
1. No later than January 26, 2015, begin submitting discharge monitoring reports electronically using
NC DWR's eDMR application system. See Special Condition A (10).
2. See condition A (2) of this permit for instream monitoring requirements. Daily shall be defined as
Monday through Friday excluding weekends and legal holidays per NCAC 2B .0503(5).
3. The monthly average CBOD5 and Total Suspended Solids concentrations shall not exceed 15% of
the respective influent value (85% removal).
4. Summer shall be defined as April 1- October 31 with winter defined as the balance of the year.
5. For a given wastewater sample, TN = TKN + NO3-N + NO2-N, where TN is total nitrogen, TKN is
total Kjeldahl Nitrogen, and NOs-N and NO2-N are nitrate and nitrite nitrogen, respectively.
6. TN load is the mass quantity of total nitrogen discharged in a given time period.
See condition A (3) of this permit.
7. The annual TN load limit became effective with the calendar year beginning on January 1, 2003.
Compliance with this limit shall be determined in accordance with condition A (4) of this permit.
8. The quarterly average for total phosphorus shall be the average of composite samples collected
during each calendar quarter (January - March, April - June, July - September, October - December).
9. Metals monitoring shall be performed in conjunction with Chronic Toxicity Testing.
10. Chronic Toxicity (Ceriodaphnia) @ 90%, February, May, August, November; see condition A (5) of
this permit. TOXICITY MONITORING SHALL COINCIDE WITH METALS MONITORING FOR
COPPER AND ZINC.
11. Multiple Species Toxicity Testing is required for permit renewal. See Special Condition A (12).
12. The permittee shall perform three Effluent Pollutant Scans during the term of this permit.
See Special Condition A (9).
There shall be no discharge of floating solids or visible foam in other than trace amounts.
Page 4 of 12

Permit NC0048879
A.(2.) INSTREAM MONITORING REQUIREMENTS
Instream monitoring is required for the following parameters at the locations specified:
PARAMETER '
;_ SAMPLE TYPE
LOCATIONI.
CBOD5
Grab
U,D1.3
NH3 as N
Grab
U,D1_3
Dissolved Oxygen
Grab
U,D1_3
Temperature
Grab
U,D1_3
pH
Grab
D2
Footnotes:
1. U: Upstream immediately below dam release. Di: Downstream at Ebenezer Church Road. D2: Downstream
between U.S. 1 and Lassiter Mill Dam. D3: Downstream at New Hope Road. Stream samples shall be collected
three times per week during the months of June, July, August, and September and weekly during the remainder of
the year. As a participant in the Lower Neuse Basin Association, Inc. (LNBA), the subject facility is not responsible
for conducting the instream monitoring requirements summarized above. Should your membership in the
Association be terminated, the Division shall be immediately notified and all instream monitoring requirements
will be immediately reinstated. Locations U and Di are not monitored under the LNBA agreement with the
Division.
A.(3.) CALCULATION OF TOTAL NITROGEN LOADS
(1) The Permittee shall calculate monthly and annual TN Loads as follows:
(a) Monthly TN Load (pounds/month) = TN x TMF x 8.34
where: TN = the average Total Nitrogen concentration (mg/L) of the composite
samples collected during the month
TMF = the Total Monthly Flow of wastewater discharged during the month
(MG/month)
8.34 = conversion factor, from (mg/L x MG) to pounds
(b)Annual TN Load (pounds/year) = Sum of the 12 Monthly TN Loads for the calendar year
(2) The Permittee shall report monthly Total Nitrogen results (mg/L and pounds/month) in the
appropriate discharge monitoring report for each month and shall report each year's results
(pounds/year) with the December report for that year.
Page 5 of 12

Permit NC0048879,
•
A.(4.) ANNUAL LIMITS FOR TOTAL NITROGEN
(1) Total Nitrogen (TN) allocations and TN Load limits for NPDES dischargers in the Neuse River
basin apply on a calendar year basis.
(2) For any given calendar year, the Permittee shall be in compliance with the annual TN Load limit
in this Permit if:
1. the Permittee's annual TN discharge is less than or equal to its TN Load limit, or
2. the Permittee is a co-permittee member of a compliance association.
If the Permittee is not a co-permittee member of a compliance association and the Permittee's
cumulative annual TN discharge exceeds the effective TN Load limit in this permit at any point
during the calendar year, the Permittee is in violation of its TN Load limit, and each day of a
continuing violation shall constitute a separate violation.
(4) The TN Load limit in this Permit (if any) may be modified as the result of allowable changes in
the Permittee's TN allocation.
1. Allowable changes include those resulting from purchase of TN allocation from the .
Wetlands Restoration Fund; purchase, sale, trade, or lease of allocation between the
Permittee and other dischargers; regionalization; and other transactions approved by the
Division.
2. The Permittee may request a modification of the TN Load limit in this Permit to reflect
allowable changes in its TN allocation. Upon receipt of timely and proper application, the
Division will modify the permit as appropriate and in accordance with state and federal
program requirements.
3. Changes in TN limits become effective on January 1 of the year following permit
modification. The Division must receive application no later than August 31 for changes
proposed for the following calendar year.
4. Application shall be sent to:
NCDWR / NPDES Programs
Attn: Neuse River Basin Coordinator
1617 Mail Service Center
Raleigh, NC 27699-1617
If the Permittee is a member and co-permittee of an approved compliance association, its TN
discharge during that year is governed by that association's group NPDES permit and the TN
limits therein.
1. The Permittee shall be considered a Co-Permittee Member for any given calendar year in
which it is identified as such in Appendix A of the association's group NPDES permit.
2. Association roster(s) and members' TN allocations will be updated annually and in
accordance with state and federal program requirements.
3. If the Permittee intends to join or leave a compliance association, the Division must be
notified of the proposed action in accordance with the procedures defined in the
association's NPDES permit.
(i)
(3)
(5)
Upon receipt of timely and proper notification, the Division will modify the permit as
appropriate and in accordance with state and federal program requirements.
Membership changes in a compliance association become effective on January 1 of the
year following modification of the association's permit.
(6) The TN monitoring and reporting requirements in this Permit remain in effect until expiration of
this Permit and are not affected by the Permittee's membership in a compliance association.
Page 6of12

Permit NC0048879
A.(5.) CHRONIC TOXICITY PERMIT LIMIT (Quarterly)
The effluent discharge shall at no time exhibit observable inhibition of reproduction or significant mortality
to Ceriodaphnia dubia at an effluent concentration of 90%.
The permit holder shall perform at a minimum, quarterly monitoring using test procedures outlined in the
"North Carolina Ceriodaphnia Chronic Effluent Bioassay Procedure," Revised December 2010, or subsequent
versions or "North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure" (Revised- December
2010) or subsequent versions. The tests will be performed during the months of February, May, August,
and November. These months signify the first month of each three month toxicity testing quarter assigned to
the facility. Effluent sampling for this testing must be obtained during representative effluent discharge and
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 -December 2010) 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, DWR Form AT-3 (original) is to be
sent to the following address:
Attention: North Carolina Division of Water Resources
Water Sciences Section
1621 Mail Service Center
Raleigh, North Carolina 27699-1621
Completed Aquatic Toxicity Test Forms shall be filed with the Environmental Sciences Section no later than
30 days after the end of the reporting period for which the report is made.
Test data shall be complete, accurate, indude all supporting chemical/ physical measurements and all
concentration/response data, and be certified by laboratory supervisor and ORC or approved designate
signature. Total residual chlorine of the effluent toxicity sample must be measured and reported if chlorine
is employed for disinfection of the waste stream.
Should there be no discharge of flow from the facility during a month in which toxicity monitoring is
required, the permittee will complete the information located at the top of the aquatic toxicity (AT) test form
indicating the facility name, permit number, pipe number, county, and the month/year of the report with
the notation of "No Flow" in the comment area of the form. The report shall be submitted to the
Environmental Sciences Section at the address cited above.
Should the permittee fail to monitor during a month in which toxicity monitoring is required, monitoring
will be required during the following month. Assessment of toxicity compliance is based on the toxicity
testing quarter, which is the three month time interval that begins on the first day of the month in which
toxicity testing is required by this permit and continues until the final day of the third month.
Should any test data from this monitoring requirement or tests performed by the North Carolina Division of
Water Resources indicate potential impacts to the receiving stream, this permit may be re -opened and
modified to include alternate monitoring requirements or limits.
If the Permittee monitors any pollutant in the effluent as specified in Part II.E. 5.b. of this permit or in
conjunction with effluent toxicity testing, the results of such monitoring shall be included in the calculation
& reporting of the data submitted on the DMR & all AT Forms submitted.
NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum control
organism survival, minimum control organism reproduction, and appropriate environmental controls, shall
constitute an invalid test and will require immediate follow-up testing to be completed no later than the last
day of the month following the month of the initial monitoring.
Page 7 of 12

Permit NC0048879,.
A.(6.) CLARIFICATION OF COMPLIANCE WHEN A PERMIT LIMIT IS SET AT OR
BELOW ML (MINIMUM LEVELS)
a. The following definitions apply to this permit:
1. The Minimum Level (ML) is defined as the concentration in a sample that is equivalent to
the concentration of the lowest calibration standard analyzed by a specific analytical
procedure.
2. The Method Detection Limit (MDL) is defined as the minimum concentration of an analyte
that can be measured and reported with 99 percent confidence that the analyte
concentration is greater than zero, as determined by a specific analytical procedure.
b. In cases where the permit limit for a parameter is set at or below the Minimum Level (ML) for
that parameter as defined above and the measurement for that parameter is less than the ML,
the permittee shall be considered to be in full compliance with the permit if the value reported
on the discharge monitoring report for that parameter is less than the ML.
A.(7.) CLARIFICATION OF MONITORING REQUIREMENTS
In accordance with 15A NCAC 2B .0505 (c) (4), stream sampling may be discontinued when flow
conditions or extreme weather conditions could result in injury or death of the person(s) collecting the
samples. In such cases, on each day that sampling is discontinued, written justification for the
discontinuance shall be specified in the monitoring report for the month in which the event occurred.
This provision also applies to influent and effluent sampling.
A.(8.) TOTAL NITROGEN ALLOCATIONS
a. The following table lists the Total Nitrogen (TN) allocation(s) assigned to, acquired by, or
transferred to the Permittee in accordance with the Neuse River nutrient management rule (T15A
NCAC 02B .0234) and the status of each as of permit issuance. For compliance purposes, this table
does not supersede any TN limit(s) established elsewhere in this permit or in the NPDES permit
of a compliance association of which the Permittee is a Co-Permittee Member.
ALLOCATION
TYPE
SOURCE
DATE _
ALLOCATION AMOUNT 1
STATUS
Estuary
(lb/yr)
Discharge
(Ib/yr)
Base
Assigned by Rule
(T15A NCAC 02B .0234)
12/7/97;
4/1/03
67,579
135,158
Active
Supplemental
Town of Morrisville,
NC0050041
2,022
4,044
Active
Supplemental
Town of Morrisville,
NC0050938
2,022
4,044
Active
TOTAL
71,623
143,246
Active
Footnote:
1. Transport Factor = 50%
b. Any addition, deletion, or modification of the listed allocation(s) (other than to correct
typographical errors) or any change to Active status of any of the listed allocations shall be
considered a major modification of this permit and shall be subject to the public review process
afforded such modifications under state and federal rules.
Page 8 of 12

Permit NC0048879
A.(9.) EFFLUENT POLLUTANT SCAN
The Permittee shall perform a total of three (3) Effluent Pollutant Scans for all parameters listed below.
One scan must be performed in each of the following years: 2015, 2016, and 2017. Analytical methods
shall be in accordance with 40 CFR Part 136 and shall be sufficiently sensitive to determine whether
parameters are present in concentrations greater than applicable standards and criteria. Samples should
be collected with one quarterly toxicity test each year, and must represent seasonal variation [i.e., do not
sample in the same quarter every year]. Unless otherwise indicated, metals shall be analyzed as "total
recoverable."
Ammonia (as N)
Chlorine (total residual, TRC)
Dissolved oxygen
Nitrate/Nitrite
Kjeldahl nitrogen
Oil and grease
Phosphorus
Total dissolved solids
Hardness
Antimony
Arsenic
Beryllium
Cadmium
Chromium
Copper
Lead
Mercury (EPA Method 1631E)
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-tetrachloroethane
Tetrachloroethylene
Toluene
1,1,1-trichloroethane
1,1,2-trichloroethane
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
Reporting. Test results shall be reported on DWR Form A MR PPA1 (or in a form approved by the
Director) by December 31st of each designated sampling year. The report shall be submitted to the
following address: NC DENR/ DWR/ Central Files, 1617 Mail Service Center, Raleigh, North
Carolina 27699-1617.
Page 9 of 12

Permit NC0048879.
iJ
A.(1O.) ELECTRONIC REPORTING OF DISCHARGE MONITORING REPORTS
Proposed federal regulations require electronic submittal of all discharge monitoring reports (DMRs)
and specify that, if a state does not establish a system to receive such submittals, then permittees must
submit DMRs electronically to the Environmental Protection Agency (EPA). The Division anticipates
that these regulations will be adopted and is beginning implementation in late 2013.
NOTE: This special condition supplements or supersedes the following sections within Part II of this
permit (Standard Conditions for NPDES Permits):
• Section B. (11.) Signatory Requirements
• Section D. (2.) Reporting
• Section D. (6.) Records Retention
• Section E. (5.) Monitoring Reports
1. Reporting [Supersedes Section D. (2.) and Section E. (5.) (a)j
Beginning no later than January 26, 2015, the permittee shall begin reporting discharge monitoring
data electronically using the NC DWR's Electronic Discharge Monitoring Report (eDMR) internet
application.
Monitoring results obtained during the previous month(s) shall be summarized for each month and
submitted electronically using eDMR. The eDMR system allows permitted facilities to enter
monitoring data and submit DMRs electronically using the internet. Until such time that the state's
eDMR application is compliant with EPA's Cross -Media Electronic Reporting Regulation
(CROMERR), permittees will be required to submit all discharge monitoring data to the state
electronically using eDMR and will be required to complete the eDMR submission by printing,
signing, and submitting one signed original and a copy of the computer printed eDMR to the
following address:
NC DENR / DWR / Information Processing Unit
ATTENTION: Central Files / eDMR
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
If a permittee is unable to use the eDMR system due to a demonstrated hardship or due to the
facility being physically located in an area where less than 10 percent of the households have
broadband access, then a temporary waiver from the NPDES electronic reporting requirements
may be granted and discharge monitoring data may be submitted on paper DMR forms (MR 1,1.1,
2, 3) or alternative forms approved by the Director. Duplicate signed copies shall be submitted to
the mailing address above.
Requests for temporary waivers from the NPDES electronic reporting requirements must be
submitted in writing to the Division for written approval at least sixty (60) days prior to the date the
facility would be required under this permit to begin using eDMR. Temporary waivers shall be
valid for twelve (12) months and shall thereupon expire. At such time, DMRs shall be submitted
electronically to the Division unless the permittee re -applies for and is granted a new temporary
waiver by the Division.
Page 10 of 12

Permit NC0048879
Information on eDMR and application for a temporary waiver from the NPDES electronic reporting
requirements is found on the following web page:
http:/ /portal.ncdenr.org/web/wq/admin/bog/ipu/edmr
Regardless of the submission method, the first DMR is due on the last day of the month following
the issuance of the permit or in the case of a new facility, on the last day of the month following the
commencement of discharge.
2. Signatory Requirements [Supplements Section B. (11.) (b) and supersedes Section B. (11.) (d)1
All eDMRs submitted to the permit issuing authority shall be signed by a person described in Part
II, Section B. (11.)(a) or by a duly authorized representative of that person as described in Part II,
Section B. (11.)(b). A person, and not a position, must be delegated signatory authority for eDMR
reporting purposes.
For eDMR submissions, the person signing and submitting the DMR must obtain an eDMR user
account and login credentials to access the eDMR system. For more information on North
Carolina's eDMR system, registering for eDMR and obtaining an eDMR user account, please visit
the following web page:
http://portal.ncdenr.org/web/wq/admin/bog/ipu/edmr
Certification. Any person submitting an electronic DMR using the state's eDMR system shall make
the following certification [40 CFR 122.22]. NO OTHER STATEMENTS OF CERTIFICATION WILL
BE ACCEPTED:
"I certzfij, under penalty of law, that this document and all attachments were prepared under my direction or
supervision in accordance with a system designed to assure that qualified personnel properly gather and
evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or
those persons directly responsible for gathering the information, the information submitted is, to the best of
my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for
submitting false information, including the possibility of fines and imprisonment for knowing violations."
3. Records Retention [Supplements Section D. (6.)1
The permittee shall retain records of all Discharge Monitoring Reports, including eDMR
submissions. These records or copies shall be maintained for a period of at least 3 years from the
date of the report. This period may be extended by request of the Director at any time [40 CFR
122.41].
A.(11.) MERCURY MINIMIZATION PLAN (MMP)
The permittee shall develop and implement a Mercury Minimization Plan (MMP) during this permit
term. The MMP shall be developed by October 28, 2014, and shall be available for inspection on -site. A
sample MMP was developed through a stakeholder review process and has been placed on the Division
website for guidance (http://portal.ncdenr.org/web/wq/swp/ps/npdes, under Model Mercury
Minimization Plan). The MMP should place emphasis on identification of mercury contributors and
goals for reduction. Results shall be summarized and submitted with the next permit renewal.
Page 11 of 12

Permit NC0048879
M
A.(12.) MULTIPLE SPECIES TOXICITY TESTING FOR PERMIT RENEWAL
In accordance with Federal Regulations 40 CFR 122.21 the EPA requires a minimum of two species
(vertebrates and invertebrates) to be tested either quarterly, four tests minimum, for a 12 month period
prior to submittal of the permit renewal application, or four tests performed at least annually in the
four and one-half years prior to submittal of the renewal application. These tests shall be performed for
acute or chronic toxicity, whichever is specified in the Whole Effluent Toxicity Testing special condition
listed in this permit. The results are to be induded in the renewal application, EPA Form 2A, and
discussed as required.
Page 12 of 12

NC0048879 — North Cary WRF
Latitude:
Longitude:
Quad #:
Stream Class:
35°50'16"
78°46'50"
Cary, N.C.
B-NSW
Receiving Stream: Crabtree Creek
Permitted Flow: 12.0 MGD
Sub -Basin:
8-Digit HUC:
03-04-02
03020201
Town of Cary
Wake County

DENR/DWR
FACT SHEET FOR NPDES PERMIT DEVELOPMENT
NPDES Permit NC0048879
Facility Information
Applicant/Facility Name:
Town of Cary — North Cary Water Reclamation Facility
Applicant Address:
316 N. Academy Street, Cary, NC 27511
Facility Address:
1900 Old Reedy Creek Road, Cary, NC
Permitted Flow
12.0 MGD
Type of Waste:
97% domestic, 3% industrial
Facility/Permit Status:
Renewal
County:
Wake
Miscellaneous
Receiving Stream:
Stream Classification:
Crabtree Creek
B-NSW
Regional Office:
USGS 'I'opo Quad:
Raleigh
D23SE, Cary
303(d) Listed?:
Subbasin:
Yes, PCB
03-04-02
Permit Writer:
Date:
Julie Grzyb
1/13/14 revised 3/20/14
Drainage Area (mi2):
52.2
Summer 7Q10 (cfs)
0.3
Winter 7Q10 (cfs):
0.8
Average Flow (cfs):
IWC (%) 12.0 MGD:
IWC (%) for WET:
Regulated
98.4
90
This permit is for the permit renewal of the North Cary Water Reclamation Facility (NC0048879). This
facility is designed to handle 12 MGD and provides biological nutrient removal utilizing anaerobic selectors,
mechanical aeration, anoxic zones and post aeration within an oxidation ditch configuration. The clarified
effluent is conveyed to tertiary treatment which consists of deep bed sand filtration and ultraviolet
disinfection. Biosolids are thickened with gravity belt thickeners and temporarily stored in aeration tanks until
the biosolids are transported to the South Cary Water Reclamation Facility for aerobic digestion and thermal
drying. During the past permit cycle, the North Cary WRF installed an additional 42 MGD peak flow
mechanical bar screen between the existing influent pump stations and the existing mechanical bar screen.
Originally, the total nitrogen load for this facility in the 2000 renewal was 144,1341bs/year. Between the time
the permit was issued in 2000 and the adoption of the final Neuse rules in May 2007, additional, unallocated
flow from minor facilities was discovered. Because the total allowable load from all minor facilities is
constant, this additional flow reduced equivalent concentration for all minor facilities. This is of particular
importance for this facility because it connected two minor discharges (Town of Morrisville WWTPs) prior
to the 2000 renewal but after 1995. Because the Neuse rules base TN load on 1995 flow, the allocated load
for these facilities was adjusted downward based on the additional flow discovered between 2000 and
October of 2002.
This facility discharges to Crabtree Creek, a Class B; NSW receiving stream impaired for PCB (fish
consumption) since 1998. In addition to the NPDES permit, the Town operates facilities for bulk and
reclaimed water distribution in accordance with Non -Discharge Permit WQ0017923.
NITROGEN:
The Environmental Management Commission adopted Nutrient Management Strategy rules in December
1997, classifying the entire Neuse River Basin as Nutrient Sensitive Waters. The point source rule (I'15A
NCAC 2B .0234) sets Total Nitrogen (TN) discharge limits for all point source dischargers larger than 0.5
MGD.
The rule also allows dischargers to form a group compliance association and work together to reduce
nitrogen; this option allows the association members added flexibility in controlling nitrogen discharges. At
the same time, the association is subject to a group NPDES permit ensuring that the association and its
individual members are accountable if they exceed the applicable nitrogen limits.

NPDES Permit NC0048879
Under the rule, there are three types of TN limits in the Neuse:
1. the individual limits in the dischargers' individual permits,
2. the aggregate limit in an association's group NPDES permit, and
3. the individual allocations/limits for each Association member, also in that association permit.
A discharger may be subject to the first type of limit, or to the second and third, but never to all three at the
same time. The discharger is first subject to the TN limit (if any) in its individual NPDES permit. If the
discharger becomes a co-permittee to a compliance association's group NPDES permit, it is then governed
by the TN limits in that permit. If the association complies with its group TN limit in a given year, all
members are deemed to be in compliance with their individual allocations/ limits in the group permit. If the
association exceeds its limit, the members then become subject to their individual allocations/ limits as well.
Regardless of which permit governs a TN discharge, allocations/ limits will likely change over time as the
dischargers purchase, sell, trade, lease, or otherwise transfer nitrogen allocations. The Division will modify
the affected permits as necessary to ensure that the limits are kept up to date and reflect any such
transactions.
RPA:
Reasonable potential analyses (RPA) were conducted for Cu, CN, F, Pb, Mo, and Zn. All other toxicants
reported samples at levels below detection — As, Cd, Cr, Ni, Se, and Ag. Please see attached Reasonable
Potential Analysis. The Town samples metals twice per month and has performed a headworks analysis as
part of its Pretreatment Program with the state. No SIU's currently discharge to this facility.
Effluent data showed a reasonable potential to violate NC WQS for Cu and Zn. Therefore, Cu and Zn
monitoring was added to the permit, however, since both parameters have action level standards, the
parameters will not be limited but quarterly sampling will be required in conjunction with toxicity testing.
CN, Pb, (see addendum below) F effluent data showed reasonable potential to violate NC WQS. All three
parameters will be limited in the draft permit with monthly monitoring requirements •
Mo effluent data did not show reasonable potential to violate NC WQS.
TOXICITY TESTING:
Chronic P/F @ 90% at 12.0 MGD using Ceriodaphnia.
No change to the toxicity testing condition is recommended at this time. The facility passed 27 whole
effluent toxicity (WET) tests for the period of review (2008 — 8/2013) with two exceptions. The tests
conducted subsequent to failure have passed.
MERCURY LIMITATION DEVELOPMENT:
Effluent Mercury Data
2009
2010
2011
2012
2013
# of Samples
4
8
8
8
2
Annual Average, ng/L
1.8
0.7
0.6
0.3
0.5
Maximum Value, ng/L
2.3
1.73
1.83
0.50
0.50
TBEL, ng/L
47
WQBEL, ng/L
12.2
Per the Division guidelines for implementing the mercury 'I'MDL, five years of mercury effluent data was
evaluated. Annual averages for all five years were less than the allowable Water Quality Based Effluent
Limitation of 12.2 ng/L. No samples were greater than the Technology Based Effluent Limitation (1'J3EL) of
47 ng/L. Per Division guidelines, the City will be required to implement a Mercury Minimization Plan.
Page 2 of 5

NPDES Permit NC0048879
COMPLIANCE SUMMARY:
A review of the facilities compliance data indicates very good performance. There were no permit limit
violations during the review period (2008 —11/2013).
INSTREAM MONITORING:
This facility is a participant in the Lower Neuse River Basin Association (LNBA). As a result, instream
monitoring requirements are provisionally waived in lieu of monitoring conducted by LNBA. Instream
monitoring requirements will be immediately reinstated should the Permittee terminate participation in the
LNBA and are outlined in condition A. (2) of the permit renewal.
NORTH CARY WRF PROPOSED PERMIT LIMITS AND RATIONALE:
Justification for all parameters is given but the parameters in bold print are proposed changes in this permit renewal.
All other limits remain the same as the previous permit.
PARAMETER
EFFLUENT LIMITATIONS
RATIONALE FOR LIMITAION
Monthly
Average
Weekly
Average
Daily
Maximum
Flow
12.0 MGD
Design Flow
CBOD5 (Summer)
4.1 mg/L
6.0 mg/L
WLA (9-12-94)
CBOD5 (Winter)
8.2 mg/L
12.3 mg/L
WLA (9-12-94)
Total Suspended Solids
30.0 mg/L
45.0 mg/L
BPJ
NH3 as N (Summer)
0.5 mg/L
1.5 mg/L
WLA (9-94) and BPJ ammonia agreement with Town
NH3 as N (Winter)
1.0 mg/L
3.0 mg/L
WLA (9-94) and BPJ ammonia agreement with Town
Dissolved Oxygen
Daily average not Tess than 5.0 mg/L
NC Water Quality Standard (WQS)
Fecal Coliform
200/100 mL
400/100 mL
NC WQS
TN Load
Monitor & Report
143,246 pounds per year
Neuse River Basin Nutrient Rules 15A NCAC 02B .0234
(TN Toad based on 1995 flows)
TotalNSW
Phosphorus
2.0 mg/L (quarterly average)
designation w/accompanying limit for new &
expanding facilities (established in permit since 9-94)
pH
Between 6.0 and 9.0 Standard Units
NC WQS
Total Mercury
MMP required
2012 Statewide Mercury TMDL
(see addendum
below)
420 0-7 2 3`
'
max)
Total Fluoride
1,830 pg/L
Monitor &
Report
Reasonable potential shown using DMR's
(1/2010-7/2013)
NC WQS(monthly avg.)
(see
addendum below)
�- fL
��
-
(, ---- - . ----.
'
Total Copper
added, Monitor and Report (pg/L)
Reasonable potential shown using DMR's
(1/2010-7/2013) must sample in conjunction
with WET tests
Total Zinc
added, Monitor and Report (pg/L)
Reasonable potential shown using DMR's
(1/2010-7/2013) must sample in conjunction
with WET tests
Chronic Toxicity
Monitor and Report
40 CFR 122.21 Federal Requirements
Effluent Pollutant Scan
Monitor and Report
40 CFR 122.21 Federal Requirements
(reduced to three annual samples)
Page 3 of 5

NPDES Permit NC0048879
PROPOSED CHANGES:
• Add quarterly monitoring for Cu and Zn in conjunction with toxicity testing.
• Add monthly average and daily maximum limitations for CN, Pb, and F along with monthly
monitoring.
• Add eDMR reporting requirements
• In accordance with the 2012 Statewide Mercury TMDL, a special condition to perform a Mercury
Minimization Plan was added to the permit.
• Reduce sampling for BOD5, NH3-N, Fecal Coliform, and TSS from daily to twice per week in
accordance the Reduction of Monitoring Frequencies in NPDES Permits for Exceptionally
Performing Facilities (Oct. 22, 2012). Evaluation provided by Town in a letter dated 3-2-2013.
Evaluation verified in the Effluent Analysis attached.
• Add revised (2012) WET special condition.
• Reduce Effluent Pollutant Scan to three annual samples and insert revised special condition.
PROPOSED SCHEDULE FOR PERMIT ISSUANCE:
Draft Permit to Public Notice: January 15, 2014 (est.)
Permit Scheduled to Issue: March 11, 2014 (est.)
STATE CONTACT:
If you have any questions on any of the above information or on the attached permit, please contact Julie
Grzyb at [phone].
NAME:
ALL 1A-1)--fr
REGIONAL COMMENTS:
No comments received.
DATE: 02 O
/cit
EPA COMMENTS:
No comments received.
ADDENDUM 3-20-14
A letter in response to the draft permit was received from the Town of Cary on Feb. 21, 2014. Each
comment in the letter is addressed in italics below. The comment letter is attached to the Fact Sheet.
1. Extend expiration to 5 years if proposed date is not included with the other NPDES permit
expiration dates in the river basin.
The expiration of Feb. 28, 2018 coincides with other permits in Wake County in the Neuse River Basin. The Feb.
28, 2018 expiration date will remain in the permit.
2. Replace the components "sludge digesters" with "Aerated holding tanks" in the Supplement to
Permit Cover.
The Component list was corrected as requested.
3. Remove Total Lead permit limitations. The reported value of 0.064 mg/L on Jan. 31, 2012 was
incorrect and should have been reported as <0.010 mg/L. A revised DMR has been submitted by
the Town.
The effluent data was corrected and the Reasonable PotentialAnalysis (RPA) showed no potential to violate the water
quality standard for Total Lead. :the lead limitations and monitoring requirements were removed from the permit.
4. Remove Total Cyanide permit limitations. The contract laboratory, Pace Analytical, agreed with the
Town that the reagent used in the sampling bottle may have resulted in a false positive cyanide test.
The letter from Pace Analytical laboratory is attached.
The letter from the laboratory was considered and the one effluent sample at 0.011 ug/L was removed from the RPA
data calculation. No reasonable potential was shown for a cyanide violation in the revised RPA. Cyanide limits and
monitoring were removed from the permit.
Page 4 of 5

NPDES Permit NC0048879
5. Remove Fluoride Permit limitation. The fluoride data point of 1.5 mg/L should be considered an
outlier.
The Division will remove faulty data but there is no policy on removing data points because thy are outliers. The
Fluoride limit and monitoring requirements will remain in the permit.
6. The Town requests clarification on which chronic sampling event the copper and zinc monitoring
should occur.
As long as the Town samples copper and kinc quarterly in conjunction with toxicity testing, and the sample being
collected is representative of the wastewaters being discharged, either day that the chronic samples are being collected are
adequate for metal sampling requirements.
7. The Town requests a reduction in the June, July, August, and September instream monitoring
requirement of 3 times per week to 2 times per month.
River Basin Associations are worded derent monitoring schedules because of their work in helping to improve and
assess the entire Basin watershed. Point source monitoring is regulated under the 1 5A NCAC 2B .0500 Surface
Water Monitoring regulations which sped frequent' of up and down stream monitoring requirements. Participation
in the LNBA waives the facility from individual instream sampling requirements.
8. The Town asked if language in the previous permit on Chronic Toxicity testing should be included
in the renewal.
The language cited in the last permit is contained in the `North Carolina Phase II Chronic l"hole Effluent Toxicz y
Test Procedure" (Revised -February 1998), approved by EPA and cited in the first paragraph of the toxicity special
condition listed in this permit. The additional paragraph was thought to be unnecessary and was removed
In the same special condition, the Town asked that the paragraph on "If the Permittee monitors any
pollutant..." be changed.
The Aquatic Toxiciy Unit reviewedyour request and revised wording has been inserted into the permit.
9. The Town requested that the 2nd species testing requirement for permit renewal be inserted into the
permit.
A new special condition, A. (12.), has been added along with a footnote on the effluent page.
10. Remove the MMP requirement.
The MMP requirement is part of the 2012 Statewide Mercury TMDL and NPDES Permitting Implementation
Plan reviewed and approved by US EPA. The MMP is required to be maintained in the permit.
Page 5 of 5

AFFIDAVIT OF PUBLICATION
STATE OF NORTH CAROLINA Ad Number
COUNTY OF WAKE 0000865974
Advertiser Name. DEPARTMENT OF WATER RESOURCES
Address:
Public Notice
• North Carolina Environmental
Management ComrrlisslonJNPDES Unit
1617 Mail Service Center
Raleigh, NC 27699-1617
Notice of Intent to Issue a
1617 MAIL SERVICE CENTER PROTECTION SECTIONTheN rih arol�ino erEnvi onmental
RALEIGH NC 276991617
Before the undersigned, a Notary Public of Wake
County North Carolina, duly commissioned and
authorized to administer oaths, affirmations, etc.,
personally appeared DEBORAH MAHAFFEY, who
being duly sworn or affirmed, according to law, doth
depose and say that he or she is Accounts
Receivable Specialist of The News & Observer a
corporation organized and doing business under
the Laws of the State of North Carolina, and
publishing a newspaper known as The News &
Observer, in the City of Raleigh, Wake County and
State aforesaid, the said newspaper in which such
notice, paper, document, or legal advertisement
was published was, at the time of each and every
such publication, a newspaper meeting all of the
requirements and qualifications of Section 1-597 of
the General Statutes of North Carolina and was a
qualified newspaper within the meaning of Section
1-597 of the General Statutes of North Carolina,
and that as such he or she makes this affidavit; and
is familiar with the books, files and business of said
corporation and by reference to the files of .said
publication the attached advertisement for
DEPARTMENT OF WATER RESOURCES was
inserted in the aforesaid newspaper on dates as
follows:
01/18/2014
4/ %4/�/_C
DEBORAH MAHAFFEY, Accounts Rcbiab(e Specialist
Wake County, North Carolina
Management Commission proposes to
issue a NPDES wastewater discharge
permit to the person(s) listed below.
Written comments regarding the pro-
posed permit will be accepted until 30
days after the publish date of this notice.
The Director of the NC Division of Water
Resources (DWR) may hold a public
hearing should there be a significant de-
gree of public Interest. Please mail corn-
ments and/or information requests to
DWR at the above address. Interested
persons may visit the DWR at 512 N. Sal-
isbury Street, Raleigh, NC to review in-
formation an file. Additional information
on NPDES permits and this notice may
be found on our website: http://portal.nc
denr.org/web/wq/swp/as/npdes/caiendar,
or by calling (91-9) 807.6390 City of Ha-
velock requested renewal of permit
NC0021253 for Havelock WWTP in Cra-
ven County; this modified permitted dis-
charge is for treated domestic wastewa-
ter to the East Prong Slocum Creek,
Neuse River Basin. The City of Raleigh
requested Renewal of permit NC0008285
far the Dempsey E. Benton WTP in
Wake County; this permitted discharge
Is treated filter backwash to Lake Ben-
son, Neuse River Basin. Fulcher's Point
Pride Seafood, Oriental, Pamlico Coun-
ty, applied to renew NPDES permit
NC0003174 discharging 10 Racoon Creek
within the Neuse River Basin. The Town
of Cary requested renewal of permit
NC0048879 for Its North Cary Water Rec-
lamation Facility In Woke County; this
permitted discharge is treated domestic
wastewater to Crabtree Creek, Neuse
River Basin.
N80: January 18, 2014
\, a11W \`\\//
pa
o��
ti
oototY Public
440ke Count•
4/0
Sworn to and subscribed before me
This 20th day of January, 2014
My Commission Expires: C 2 dQ'f
Notary Signature

(Moore, Cindy
From: Grzyb, Julie
Sent: Thursday, March 20, 2014 12:33 PM
To: Moore, Cindy
Cc: Belnick, Tom; Poupart, Jeff
Subject: Permittee comments on draft permits relating to toxicity testing
To : Cindy Moore, ATU
From: Julie Grzyb, NPDES
Date: March 20, 2014
Subject: Permittee comments on draft permits relating to toxicity testing
o'c „
Two permittees have formally requested the following change and addition to their draft permits.
1) Clarify the following paragraph in the Toxicity special condition (Acute and Chronic) —
If the Permittee monitors any pollutant more frequently than
required by this permit, the results of such monitoring shall be
included in the calculation & reporting of the data submitted on the
DMR & all AT Form submitted.
The permittees believes this paragraph is to general and can apply to all
sampling/testing data even process monitoring data.
The permittees request that the statement match what is in the Part II.E.5.b.
Standard Boiler plate -
SECTION E — Reporting Requirements
5. Monitoring Reports
Monitoring results shall be reported at the intervals specified elsewhere in this permit [40 CFR 122.41(1)(4)].
a. Monitoring results must be reported on a Discharge Monitoring Report (DMR) (See Part II.D.2) or forms
provided by the Director for reporting results of monitoring of sludge use or disposal practices.
b. If the Permittee monitors my pollutant more frequently than required by this permit using test procedures approved
under 40 CFR Part 136 an4iit a sampling location specified in this permit or other appropriate instrument governing
the discharge, the results of such monitoring shall be included in the calculation and reporting of the data submitted on
the DMR.
So, change to:
If the Permittee monitors any pollutant in the effluent as specified in
Part II.E. 5.b. of this permit or in conjunction with effluent toxicity
testing, the results of such monitoring shall be included in the
calculation & reporting of the data submitted on the DMR & all AT
Form submitted.
Or remove it all together, since its contained in the Standard Boiler plate already.
2) The Permittees request that the requirement for 2nd species toxicity testing
be added to the permit because by the time they. receive the notice to
renew their permit, the 2"d species testing should have already been
initiated. Putting it in the permit would help them get it done.
Example, insert special condition such as:
A. (X.) Multiple Species Toxicity Testing for Permit Renewal
In accordance with Federal Regulations 40 CFR 122.21 the EPA
requires a minimum of two species (vertebrates and invertebrates)
to be tested either quarterly, four tests minimum, for a 12 month
period prior to submittal of the permit renewal application, or four
tests performedatleastannualiy-in-theiour-andone=halfyearsprior
to submittal of the renewal application. These tests shall be
performed for acute or chronic toxicity, whichever is specified in the
Whole Effluent Toxicity Testing special condition listed in this permit.
The results are to be included in the renewal application, EPA Form,
and discussed as required.
Cindy, I will need to address these comments promptly (by April 4), and we are
requesting your approval to proceed with making the suggested changes listed
above or welcome suggestions from ATU. The permittees recommendations
appear to be reasonable and have been cited as concerns from other permittees in
the past. Thanks for your help.
i

Julie A. Grzyb, Environmental Engineer
NC DENR / Division of Water Resources / Water Quality Permitting
NPDES Complex Permitting, Wastewater Branch
1617 Mail Service Center, Raleigh, NC 27699-1617
919/807-6389 (wk)
[e-mail]
E-mail correspondence to and from this address may be subject to the North Carolina Public Records law and may be
disclosed to third parties.
2

March 20, 2014
A 3-a% (Y ,t d
Julie A. Grzyb, Environmental Engineer
Division of Water Resources
Surface Water Protection Section
NPDES Complex Permitting Unit
1617 Mail Service Center
Raleigh, NC 27699-1617
UTILITIES DEPARTMENT
HAND DELIVERED — March 20, 2014
Subject: Amendment to Comments Provided on February 21, 2014
North Cary WRF Draft NPDES Permit Renewal (NC0048879)
Dear Ms. Grzyb:
On February 21, 2014 the Town of Cary Utilities Department submitted a response letter
addressing items of concern noted in the draft permit NC0048879. Upon further discussion and
the recent review of the South Cary Water Reclamation Facility draft permit, some clarification
for the draft permit for North Cary WRF, (NC0048879) may be in order. We would like to submit
the following clarifications and amendments for your review.
A.(5.) Chronic Toxicity Permit Limit (Quarterly), Page 7 of 11
Request: The Town would like to request additional language be added to the A.5.Chronic
Toxicity Permit Limit (Quarterly), Page 7 of 11 section to include the multiple species testing
requirement for the NPDES permit renewal process. We would also like to see this requirement
referred to in the footnote section of A.(1.) Effluent Limitations and Monitoring Requirements.
Justification: EPA requires a minimum of two species (vertebrates and invertebrates) be tested
at a minimum quarterly for a 12-month period within the past 1-year prior to submittal of the
renewal, or four tests performed at least annually in the four and one-half years prior to the
submittal of the renewal application- provided the tests show no appreciable toxicity, and
testing for acute and/or chronic toxicity, depending on the range of receiving water dilution.
(Instructions for Completing Form 2A-Application for an NPDES Permit, Federal
Register/Vol.64, No. 149/Wednesday, August 4, 1999/Rules and Regulations Part E-Toxicity
TOWN Of CARY
400 James Jackson Avenue • Cary, NC 27513 • PO Box 8005 • Cary, NC 27512-8005
tel [phone] • fax [phone] • www.townofcary.org

Amendment to Draft NPDES Permit Comments March 20, 2014
Testing Data- page 42496 and EPA Form 3510-2A Supplemental Application Information Part
E- Toxicity Testing Data- page 15 of 22 in the NPDES Application for an NPDES Permit or
Renewal) See Attachment 1
Reference to this additional monitoring requirement in the footnote section (A.1. page 4 of 11-
Draft NPDES Permit) would direct the permittee to consult the Chronic Toxicity Permit Limit
section of the permit (A.5. page 7 of 11) for a more detailed description of what is necessary to
comply with the NPDES permit renewal process. Standard language regarding this requirement
is requested for addition to all NPDES Permits.
NOTE(s):
1. On page 2 of the North Cary WRF Fact Sheet under RPA paragraph one, it is
mentioned that we do not have an active Pretreatment Program with the State.
Although no SIU's currently discharge to the North Cary WRF, the Town of Cary
does currently have an active Pretreatment Program with the State. We made
reference to this on our renewal application (EPA Form3510-2A Rev. 1-99 page 18
of 22). We would like to request this be changed on our Fact Sheet.
We appreciate the opportunity to review and provide additional comments on the North Cary
WRF draft NPDES permit renewal. If there are any questions regarding this submittal, please
feel free to contact Mr. Paul Ray, North Cary WRF Manager at [phone] or myself at (919)
469-4303.
Sincerely,
ie Revels, P.E.
Utilities Director
Cc: Steve Brown, P,E.,Director of Water Resources
Paul Ray, NCWRF Manager
Jonathan Bulla, Team Leader Laboratory and Operations
Donald Smith, Wastewater Collections Program Manager
Page 2

Attachment I
42496 Federal Register/Vol. 64, No. 149 /Wednesday, August 4, 1999 /Rules and Regulations
Treatment works characteristics
Form 2A requirements
Design flow rate less than 1 mgd but greater than 0.1 mgd, and
Not required to have (or does not have) a pretreatment program
Design flow rate greater than or equal to 1 mgd, or
Required to have a pretreatment program (or has one in place), or
Otherwise required by the permitting authority to provide the data
Question B.6
Question B.6 and Part D of Supplemental
Application Information Packet
Minimum
number of
scans (see
Appendix A)
3
3
Complete Part D once for each outfall
through which effluent is discharged to
waters of the United States. Indicate on
each page the outfall number (as
assigned in question A.9 of the Basic
Application Information packet) for
which the data are provided. Using the
blank rows provided on the form,
submit any data the facility may have
for pollutants not specifically listed in
Part D. Note that the permitting
authority may require additional testing
on a case -by -case basis.
For specific instructions on
completing the pollutant tables in Part
D, refer to Appendix A of these
instructions.
Part E (Toxicity Testing Data)
Treatment works meeting one or more
of the following criteria must complete
Part E (Toxicity Testing Data):
• Treatment works with a design flow
rate greater than or equal to one mgd; or
• Treatment works with an approved
pretreatment program (as well as those
required to have one under 40 CFR Part
403); or
• Treatment works otherwise
required by the permitting authority to
submit the results of whole effluent
toxicity testing.
Applicants completing Part E must
submit the results from any whole
effluent toxicity test conducted during
the past four and one-half years that
have not been reported or submitted to
the permitting authority for each outfall
discharging effluent to the waters of the
United States. Do not include
information on combined sewer
overflows in this section. If the
applicant conducted a whole effluent
toxicity test during the past four and
one-half years that revealed toxicity,
then provide any information available
on the cause of the toxicity or any
results of a toxicity reduction
evaluation, if one was conducted.
Test results provided in Part E must
be based on multiple species being
tested quarterly for a minimum of one
year. For multiple species, EPA requires
a minimum of two species (e.g.,
vertebrates and invertebrates). The
permitting authority may require the
applicant to include other species (e.g.,
plants) as well. Applicants must provide
these tests for either acute or chronic
toxicity depending on the range of the
receiving water dilution. EPA
recommends that applicants conduct
acute or chronic toxicity testing based
on the following dilutions:
• Acute toxicity testing if the dilution
of the effluent is greater than 1000:1 at
the edge of the mixing zone.
• Acute or chronic toxicity testing if
the dilution of the effluent is between
100:1 and 1000:1 at the edge of the
mixing zone. Acute testing may be more
appropriate at the higher end of this
range (1000:1), and chronic testing may
be more appropriate at the lower end of
this range (100:1).
• Chronic toxicity testing if the
dilution of the effluent is less than 100:1
at the edge of the mixing zone.
All data provided in Part E must be
based on tests performed within four
and one-half years prior to completing
this application. The tests must have
been conducted since the last NPDES
permit issuance or permit modification
under 40 CFR 122.62(a). In addition,
applicants only need to submit data that
have not previously been submitted to
the permitting authority. Thus, if test
data have already been submitted
(within the last four and one-half years)
in accordance with an issued NPDES
permit, the treatment works may note
the dates the tests were submitted and
need not fill out the information
requested in question E.2 for that test.
Additional copies of Part E may be
used in submitting the required
information. A permittee having no
significant toxicity in the effluent over
the past year and who has submitted all
toxicity test results through the end of
the calendar quarter preceding the time
of permit application would need to
supply no additional toxicity testing
data as part of this application. Instead,
the applicant should complete question
E.4, which requests a summary of
bioassay test information already
submitted. (See below for more detailed
instructions on completing question E.4)
Where test data are requested to be
reported. the treatment works has the
option of reporting the requested data
on Form 2A or on reports supplied by
the laboratories conducting the testing,
provided the data requested are
complete and presented in a logical
fashion. The permitting authority
reserves the right to request that the data
be reported on Form 2A.
E.1. Required Tests
Provide the total number of chronic
and acute whole effluent toxicity tests
conducted in the past four and one-half
years. A "chronic" toxicity test
continues for a relatively long period of
time, often one -tenth the life span of the
organism or more. An "acute" toxicity
test is one in which the effect is
observed in 96 hours or less.
E.2. Individual Test Data
Complete E.2 for each test conducted
in the last four and one-half years for
which data has not been submitted. Use
the columns provided on the form for
each test and specify the test number at
the top of each column. Use additional
copies of question E.2 if more than three
tests are being reported. The parameters
listed on the form are based on EPA -
recommended test methods. Permittees
may be required by the permitting
authority to submit additional test
parameter data for the purposes of
quality assurance.
If the treatment works is conducting
whole effluent toxicity tests and
reporting its results in accordance with
a NPDES permit requirement, then the
treatment works may note the dates the
tests were submitted and need not fill
out the information requested in
question E.2. for those tests (unless
otherwise required by the permitting
authority).
a. Provide the information requested
on the form for each test reported.
Under "Test species & test method
number," provide the scientific name of
the organism used in the test and the
test method number. The "Outfall
number" reported must correlate to the
outfall numbers listed in question A.9 of
the Basic Application Information
packet.
b. Provide the source of the toxicity
test methods followed. In conducting
the tests, the treatment works must use
methods approved in accordance with
40 CFR Part 136.

C4t?tv.1 I3-1 1044,84.as, /Yen
2.11.1
UTILITIES DEPARTMENT
February 21, 2014
Julie A. Grzyb, Environmental Engineer
Division of Water Resources
Surface Water Protection Section
NPDES Complex Permitting Unit
1617 Mail Service Center
Raleigh, NC 27699-1617
HAND DELIVERED — February 21, 2014
Subject: North Cary WRF Draft NPDES Permit Renewal (NC0048879) Comments
Dear Ms. Grzyb:
On January 21, 2014 the Town of Cary Utilities Department received a draft permit for the North Cary Water
Reclamation Facility (WRF) NPDES Renewal (NC0048879) from the NCDENR — Division of Water Resources —
NPDES Complex Permitting Unit. The Town appreciates the opportunity to review the draft permit, the permit
development fact sheet, and associated reasonable potential analyses (RPA). The Town respectfully submits
the following comments and requests for modification of the proposed draft permit.
Permit Cover Page (page 1.)
Permit Expiration Date
Request: Town requests the maximum permit cycle of 5 years from issuance of the renewed NPDES
permit.
The draft permit proposes a permit expiration date of February 28, 2018. It is our understanding that
NPDES permits can have a maximum permit cycle of 5 years as identified on the NCDENR website:
http://portal.ncdenr.org/web/wq/swp/ps/npdes/permitprocess - "NPDES permits are valid for 5 years
and are renewed on a basin wide cycle, all the permits in a basin are renewed at the same time."
If the proposed February 28, 2018 expiration date is not included with other NPDES permit expiration
dates in the river basin, then the Town hereby requests the maximum permit cycle of 5 years from
issuance of the renewed NPDES permit.
TOWN Of CARY
400 James Jackson Avenue • Cary, NC 27513 • PO Box 8005 • Cary, NC 27512-8005
tel [phone] • fax [phone] • www.townofcary.org

Supplement to Permit Cover Page (page 2.)
Request: Replace the authorized operation of the "Sludge digesters" with "Aerated holding tanks"
Justification: The North Cary WRF no longer operates sludge digesters. Tanks, once used for digestion
are now used for short term aerated holding. The aerated biosolids are transported by truck for
drying.
Part I A.(1.) Effluent Limitations and Monitoring Requirements (page 3.)
Total Lead Permit Limit
Request: The Town requests removal of the total Lead permit limit.
Justification: In review of the Lead RPA and EDMR data, an error was discovered with the January 31,
2012 data entry of 0.064 mg/L. After review of laboratory data it was identified that a transcription
error occurred in the EDMR system. The January 31, 2012 Lead data should be reported as <0.010
mg/L. A revised DMR was submitted on January 23, 2014. With this correction a recalculated RPA
does not result in reasonable potential to exceed water quality standards.
Total Cyanide Permit Limit
Request: The Town requests removal of the total Cyanide permit limit
Justification: In review of the Cyanide RPA data, the Town investigated the data set and in particular
the June 12, 2012 cyanide data point of 0.011 mg/L. The cyanide data point of 0.011 mg/L is more
than 6 times the standard deviation of the evaluated data set. Data points greater than 3 standard
deviations of the mean would be highly suspect and considered an outlier.
Cyanide
Data Time Frame
January 2010 to July 2013
Standard Deviation
0.0009045
Maximum Value (mg/L)
0.011
Average (mean) Value (mg/L)
0.00514
With this extreme outlier, the Town further investigated the data and discovered an error in a contract
laboratory sample preservation procedure that resulted in the false positive cyanide value. A cyanide
sample collected for June 12, 2012 included ascorbic acid in the sample bottle for removal of oxidizers
(chlorine) prior sample preservation. The North Cary WRF utilizes UV disinfection and no oxidizers or
chlorine is used for treatment of the effluent.

According to the American Society for Testing and Materials Standard (ASTM D 7365 — 09a) - Standard
Practice for Sampling, Preservation and Mitigating Interferences in Water Samples for Analysis of
Cyanide includes the following references regarding proper sample collection and use of reducing
agents when collecting cyanide samples:
5.1: "improper sample collection or pretreatment can result in significant positive or negative bias
potentially resulting in unnecessary permit violations or undetected cyanide releases into the
environment."
8.3.9: "Add a reducing agent only if an oxidant is known or expected to be present. Some of these
reagents (Ascorbic Acid) have shown to produce a positive or negative Cyanide bias."
After review of the sampling procedure and the error performed, the contract laboratory provided the
attached (Attachment 1.) qualification letter stating the 0.011 mg/L result was due to a positive
interference caused by ascorbic acid.
With the above information, the Town finds the June 12, 2012 cyanide result to be invalid and non-
representative and therefore should not be included in the RPA. With this outlier removed from the
data set, the RPA does not result in a potential to exceed water quality standards as all other data is
less than the detection level of 0.005 mg/L.
It is also noted that the cyanide sample type in the draft permit limits table is listed as a composite
sample. The Town believes samples for the analysis of cyanide should be collected using a grab sample
type.
Total Fluoride Permit Limit
Request: The Town request removal of the total Fluoride permit limit.
Justification: In review of the fluoride RPA data, the Town investigated a September 7, 2010 fluoride
data point of 1.50 mg/L. In our review the Town considers this data point to be an outlier and not valid
for use in RPA calculation. The fluoride data point of 1.50 mg/L is more than 3 times the standard
deviation of the evaluated data set. Data points greater than 3 standard deviations of the mean would
be highly suspect and considered an outlier.
Fluoride
Data Time Frame
January 2010 to July 2013
Standard Deviation
0.1873
Maximum Value (mg/L)
1.50
Average (mean) Value (mg/L)
761.8605
With this outlier removed from the data set, a recalculated RPA does not result in potential to exceed
water quality standards.

, Please note that in February of 2011 the Town reduced the fluoride concentration in the municipal
water supply from 1.0 mg/L to 0.70 mg/L (Attachment #2 A & B). The decrease in fluoride resulted in
lower effluent concentrations and is reflected in the submitted data.
Part I A.(1.) Effluent Limitations and Monitoring Requirements — Footnote #9 & 10.
Request Clarification: Each toxicity analysis requires multiple sampling events. Please clarify which
sampling event(s) require the Copper and Zinc monitoring.
"9. Metals monitoring shall be performed in conjunction with Chronic Toxicity Testing
10. Chronic Toxicity (Ceriodaphnia) @ 90%, February, May, August, November; see condition A (5) of
this permit. TOXICITY MONITORING SHALL COINCIDE WITH METALS MONITORING FOR COPPER AND
ZINC."
Part I A.(2.) — Instream Monitoring Requirements —Footnote 1. (page 5.)
Request: The Town requests a reduction in the June, July, August, and September instream monitoring
requirement of 3 times per week to 2 times per month. The Town also requests a reduction in the
remainder calendar months from a once per week monitoring requirement to once per month.
The Town is a member of the Lower Neuse Basin Association (LNBA), in which the LNBA permittees
have a Memorandum of Agreement (MOA) with NCDENR — Division of Water Resources for instream
water quality monitoring. The MOA prescribes monitoring locations, parameters, and monitoring
frequencies for the LNBA . The Town believes the same monitoring frequencies in the MOA should be
extended to the Town for the parameters listed in the Part I (A.)2. Instream Monitoring Requirement
Table of the draft permit. Significantly increasing monitoring requirements on an individual permittee
that are no longer a member of the LNBA or under the MOA will result in a significant staffing and cost
impact on the individual permittee. It is not understood why increased monitoring would be required
of the individual permittee if the MOA does not already require such an increased monitoring
requirement.
Part I A.(5.) Chronic Toxicity Permit Limit (Quarterly) (page 7.)
Request Clarification: Part I A.(5.) (fourth paragraph) The paragraph below is an excerpt of the
existing North Cary WRF NPDES permit. This paragraph was not included in the draft permit. Should
this language be included in the permit?
'bite chronic value for multiple concentration tests will be determined ttsitil; the geometric' mean of the highest
concentration having no detectable impairment of reproduction or Survival and the lowest concentration that does
have A detect tble impairment of reproduction or .urvival. The definition of "Medallic impairment," collection
methods, exposure regimes. and further statisitc:tl methods art $lpceilicd in the "North Carolina Phase 1I Chronic
Whole Rif ttetit Toxicity Tot Procedure" (Revised-Vebntary 199) or s.ubscyuent versions.

Request: Page 7 of 11—A.(5.) The second sentence from the bottom of the page should include
additional language to clarify the requirement. The current language, as noted below, reads that all
sampling data that is performed must be included on the DMR and Aquatic Toxicity Testing Forms.
This may be interpreted to include all process monitoring data that is collected. The language also
implies a permittee is able to add internally produced data to the AT form which is generated and
signed by a private lab.
DWR Draft Language -
"If the Permittee monitors any pollutant more frequently than required by this permit, the results of
such monitoring shall be included in the calculation & reporting of the data submitted on the DMR & all
AT Form submitted."
Proposed Language -
If the Permittee monitors any pollutant in the effluent as specified in Part II. E. 5.(b.) of this permit or
more frequently than required by this permit in conjunction with effluent toxicity testing, the results of
such monitoring shall be included in the calculation & reporting of the data submitted on the DMR & all
AT Forms submitted by the permittee."
Part I A.(11.) — Mercury Minimization Plan (pagell.)
Request: The Town requests the removal of the Mercury Minimization Plan requirement.
Justification: A review of the North Cary WRF effluent mercury data (Attachment 3.) was performed
for the time period of January 1, 2009 to December 31, 2013. A total of 20 data points were collected
with a maximum effluent mercury concentration of 2.3 nanograms per liter (ng/L) and an average
effluent concentration of 0.73 ng/L (using 0 for data less than the detection level). The average
effluent concentration of 0.73 ng/L is Tess than the typical low level mercury EPA Method 1631-E
Practical Quantitation Level (PQL) of 1.0 ng/L for the effluent matrix. It is important to note that 60%
of the data points collected over the 5 year time period were less than the PQL; therefore, the effluent
mercury is more often non-quantifiable/detect and does not meet the consistently detectable criteria
established in the NCDENR — Mercury Post-TMDL Permitting Strategy (September 12, 2012), Specific
Permit Considerations:
"A. Existing Municipal Facilities"
1. Major facilities currently without a limit
• Monitor for mercury in conjunction with their priority pollutant analysis.
• Develop a Mercury Minimization Plan (MMP) that would identify contributors and goals for reduction.
(If facility has consistent detectable mercury concentrations in effluent.) DWQ will work with
municipalities to develop a standard MMP that is appropriate in scope.
The Town does not believe that an NPDES required MMP is supported by the Mercury Post — TMDL
Permitting Strategy or is necessary with this permit renewal. The Town will continue to monitor
mercury in the WRF influent and effluent and address mercury discharges with its industrial
pretreatment and educational programs.

We appreciate the opportunity to review and provide comments on the North Cary draft NPDES
perrriit renewal. If there are any questions regarding this submittal, please feel free to contact Mr.
'Paul Ray, North Cary WRF Manager at [phone] or myself at [phone].
incerely,
ie Revels, P.
Utilities Director
Cc: Steve Brown, P.E.,Director of Water Resources
Paul Ray, NCWRF Manager
Jonathan Bulla, Team Leader Laboratory and Operations
Donald Smith, Wastewater Collections Program Manager

ATTACHMENT 1
ace Analytical
(,/,/jil
January 21, 2014
Mr. Jonathon Bulla
North Cary WWTP
1900 Old Reedy Circle
Cary, NC 27513
RE: Client Project ID: 1206-00595
Pace Project ID: 92121264
Dear Mr. Bulla:
I am writing in regards to the investigation into the positive cyanide results for samples INF and
EFF (EPIC sample numbers 92121264001, and 92121264002 respectively), which were
collected on June 12, 2012.
During the investigation, we reviewed all calculations, calibration verifications and calibration
blanks. All were within acceptance limits and no transcription errors occurred. The method
blank, laboratory control sample, matrix spike and duplicate results were also all within
acceptance limits. Based on the data review, there was no indication of error.
However, there is still the possibility that a false positive occurred. Pace Analytical does not
provide cyanide sample bottles with ascorbic acid due to it being an interferant of the cyanide
analysis. These samples were not collected in ascorbic acid free bottles provided by Pace
Analytical. These bottles were provided by the laboratory Pace acquired, Tritest, which did
contain ascorbic acid. Pace Analytical has noted that once we stopped using ascorbic acid as a
dechlorinating agent, many samples stopped having positive cyanide results near the reporting
limit of 0.005 mg/L.
It is my belief that these cyanide positive results near the reporting limit came from ascorbic acid
being a positive interference.
If you have any further questions, please feel free to contact me at [phone] or you can e-
mail me at Barry.Johnson(a,pacelabs.com.
Sincerely,
Barry Johnson
Quality Manager

ATTACHMENT #2.A
PUBLIC WORKS AND UTILITIES
February 21, 2011
Ms. Jessica Godreau, Chief
Public Water Supply Section
NC Division of Environmental Health
1634 Mail Service Center
Raleigh, NC 27699-1634
RE: Fluoride Addition Modifications at the Cary/Apex Water Treatment Facility
Town of Cary — PWSID# 03-92-020
Dear Ms, Godreau:
In response to the recently issued position statement by the Public Water Supply
Section regarding recommended fluoride levels in community water systems, the
Town of Cary has lowered the level of fluoride in water supplied by the
Cary/Apex Water Treatment Facility. Fluoride will now be adjusted to a target
level of 0.7 mg/L.
The Cary/Apex Water Treatment Facility provides treated water to Cary, Apex,
Morrisville, the Raleigh -Durham International Airport and the Wake County
portion of Research Triangle Park.
If you have any questions regarding this change, please contact Kelvin Creech,
Water System Manager at [phone].
Sincerely,
Ls-L
Stephen J. Brown, P.E.
Director of Public Works and Utilities
cc: Jamie Revels, Utilities Director
Kelvin Creech, Water System Manager
Tim Donnelly, Town of Apex Public Works Director
TOWN Of CARY
400 James Jackson Avenue • Cary, NC 27513 • PO Box 8005 • Cary, NC 27512-8005
tel [phone] • fax [phone] • vvww.townofcary.org

ATTACHMENT #2.B
Public Water Supply Section
Position Statement Regarding EPA./HHS Fluoride Announcement
February 2, 2011
The purpose of this position statement is to address inquiries regarding the Public Water Supply
Section's response to the January 7, 2011, announcement by the Environmental Protection
Agency (EPA) and the U. S. Department of Health and Human Services (HHS) to propose a
recommendation of 0.7 mg/1 of fluoride in treated water to replace the current federal
recommended range of 0.7 to 1.2 mg/l.
The announcement stated that:
"The notice of the proposed recommendation will be published in the Federal
Register soon and HHS will accept comments from the public and stakeholders on
the proposed recommendation for 30 days," and "HHS is expecting to publish
final guidance for community water fluoridation by spring 2011."
Currently the North Carolina Rules Governing Public Water Systems (Section .1400) require a
community public water system to obtain approval from the N.C. Department of Environment
and Natural Resources (DENR) to fluoridate its water supply. Further, the rules require that the
approved fluoride treatment be operated in accordance with the rules in Section .1400. Rule
.1406 Control of Treatment Process states that "The treatment process shall result in the
adjustment of fluoride ion (F) in the treated water to 1.0 mg/liter." This rule was established
under the current HHS recommended range of 0.7 to 1.2 mg/1.
In light of the current proposed change in the HHS recommendation to 0.7 mg/1, the Public
Water Supply Section in the Division of Environmental Health understands that some
community public water systems in North Carolina want to now lower the fluoride ion (F)
concentration in their treated water to 0.7 mg/1.
The goal of fluoride treatment is to add enough fluoride to prevent tooth decay while avoiding
the unwanted health effects from too much fluoride. Considering that the proposed
recommendation of 0.7 mg/1 is, according to EPA and HHS, based on "most up to date scientific
data," the Public Water Supply Section does not intend to pursue action if any system chooses to
adjust their treatment process to achieve a fluoride ion (F) concentration in treated water in the
range from 0.7 to 1.0 mg/1.
The Public Water Supply Section will consider making appropriate changes to the rules in
Section .1400 based on any new recommendations from HHS and in consultation with the State
Health Director.

ATTACHMENT 3
Table 1.
North Cary WRF
Effluent Mercury Data
January 1, 2009 — December 31, 2013
Date
Effluent Mercury (.Dg/L)
2/17/2009
2.24
5/12/2009
2.20
8/11/2009
<1.00
11/10/2009
2.30
2/9/2010
1.73
5/25/2010
<1.00
8/10/2010
1.64
11/9/2010
1.02
2/15/2011
1.59
5/17/2011
1.83
8/9/2011
<1.00
11/1/2011
<1.00
2/9/2012
<1.00
5/15/2012
<1.00
8/7/2012
<1.00
11/19/2012
<1.00
2/11/2013
<1.00
5/6/2013
<1.00
8/5/2013
<1.00
11/4/2013
<1.00
# Data Points
20
Maximum Conc. (.pg/L)
2.3
Average Conc. (.ng/L)
0.73

North Cary WRF
NC0048879
REASONABLE POTENTIAL ANALYSIS
Qw (MGD) = 12.00
1QIOS(cfs)= 0.26
7QIOS(cfs)= 0.30
7Q1OW (cfs)= 0.80
30Q2 (cfs) = NO 3002 DATA
Avg. Stream Flow, QA (cfs) = NO QA DATA
Receiving Stream: Crabtree Creek
WWTP/WTP Class: Class IV
IWC @ IQIOS = 98.62%
IWC @7QIOS= 98.41%
IWC @ 7Q1OW = 95.88%
IWC @ 30Q2 = N/A
IWC @ QA = N/A
Stream Class: B; NSW
Outfall 001
Qw=12MGD
PARAMETERSTANDARDS
—
TYPE
(1)
& CRITERIA (2)
PQL
UNITS
REASONABLE POTENTIAL RESULTS
RECOMMENDED ACTION
NC WQS /
Chronic
Applied
Standard
V2 PAV /
Acute
f1
Max Pred
# Det. Cw Allowable Cw
Arsenic
Arsenic
C
C
50
10
FW(7Q10s)
HH/WS(Qavg)
ug-1.
u< I.
0
0
0
N/A
N'A
Acute: NO WQS
_ _ _—_
Chronic:___—_—__ 50.$_
Chronic-- — /WC? —
all samples < 10 uWL
p
__—_—_—_—_—_—_—_—_—_—_—_
— — — — — — — — — — —
Cadmium
NC
2
FW(7Q10s)
15
u_rl.
0
0
V;\
Acute: 15.2
hronic------2.0 ---
Chronic:_
ail samples < 1 ug/L
---------------------------
Chromium
NC
50
FW(7QIOs)
1022
u�_.I.
D
n
\
Acute: 1,036.3
----- ---
Chronic:_
hronic 50.8
all samples <5 and one <10 ug/L
--
----------------- ----
Copper (AL)
NC
7
FW(7Q10s)
7.3
ue/L
61
60
8
Acute: 7.4
_ _ -----------------------------------
Chrome 7.1
No value > Allowable Cw
—
RP for AL(Cu2n,Ag,Fe,CI) - apply Quarterly
Monitoring in conjunction with TOX Test
Cyanide
NC
P\V(%t 110s)
2
IIu
/L
43
0
5.0
Acute: 22.3
------_
Chronic
No value > Allowable Cw
all samples <5 ug/L
—
Fluoride
NC
1800
FW(7Q10s)
u_ I.
43
43
1.935.0
_
Acute: NO WQS
__ _ _ _
--—
Chronic:1,829.1
No value > Allowable Cw
—
RP for non -AL - apply Monthly Monitoring with Limit
Lead
NC
25
FW(7Q10s)
33.8
ug/L
79
u
5.2
Acute: 34.3
_ _ _
Chronic:---- 25.4
No value > Allowable Cw
No RP, Predicted Max < 50% of Allowable Cw- No
Monitoring required
Molybdenum
NC
:OW
HH(7Q10s)
ug/L
79
-I
8.8
Acute: NO WQS
_ _ -----2,032.3--
Chronic:
No value > Allowable Cw
No RP, Predicted Max < 50 % of Allowable Cw- No
Monitoring required
Nickel
NC
88
FW(7Q10s)
261
ug/L
0
0
N/A
Acute: 264.7
—Chronic: _ — — —
89.4
all samples < 10 ug/L
— — — — — — — — — — — — — —
Page 1 of 2
NC0048879 RPA-FreshwaterREV3-20-2014.xlsm, rpa
3/20/2014

North Cary WRF
NC0048879
REASONABLE POTENTIAL ANALYSIS
Outfall 001
Qw = 12 MGD
Solenium
NC
5
FW(7Q10s)
56
uLJL
0
0
N/A
Acute: 56.8
Chronic 5.1
all samples < 10 or 5 ug/L
Silver (AL)
NC
0.06
FW(7QlOs)
12;
uJl.
0
:'.
Acute: 1.247
__ _ ______ _ __
Chronic: 0.061
all samples < 5 ug/L
___ ________________-_____-__
Zinc (AL)
NC
50
FW(7Q10s)
67
un/I.
79
79
163.4
Acute: 67.9
_ _ _
Chronic: 50.8
43 value(s) > Allowable Cw
RP for AL(Cu,Zn,Ag,Fe,CI) - apply Quarterly
Monitoring in conjunction with TOX Test _ _ _
NC0048879 RPA-FreshwaterREV3-20-2014.xlsm, rpa'
Page 2 of 2 3/20/2014

REASONABLE POTENTIAL ANALYSIS
Copper (AL)
Date Data
7/12/2011
8/2/2011
8/25/2011
8/30/2011
9/6/2011
9/13/2011
9/20/2011
9/27/2011
10/11/2011
10/18/2011
10/20/2011
11/1/2011
11/3/2011
11/15/2011
11/22/2011
11/29/2011
12/6/2011
12/13/2011
1/3/2012
1/10/2012
1/18/2012
1/24/2012
1/31/2012
2/7/2012
2/9/2012
2/14/2012
2/28/2012
3/6/2012
3/13/2012
3/15/2012
3/27/2012
4/3/2012
4/10/2012
4/12/2012
4/17/2012
4/24/2012
5/1/2012
5/15/2012
5/17/2012
5/22/2012
5/29/2012
6/5/2012
6/12/2012
6/19/2012
6/26/2012
7/5/2012
7/10/2012
7/17/2012
7/24/2012
8/7/2012
9/4/2012
10/3/2012
11/13/2012
12/4/2012
1/3/2013
2/22/2013
3/30/2013
4/4/2013
5/14/2013
6/11/2013
7/2/2013
BDL=1/2DL Results
5 Std Dev.
2 Mean
3 C.V.
3 n
3
3 Mult Factor =
3 Max. Value
3 Max. Pred Cw
3
3
3
3
2
3
3
4
4
3
6
3
4
4
0.5
4
3
6
3
4
4
5
3
3
4
4
4
4
3
3
2
3
3
3
3
3
3
2
2
3
3
3
3
5
3
4
2.5
4
4
4
4
6
5
USE ONLY
"PASTE
SPECIAL -
Values" WITH
"COPY"
1.0021
3.4098
0.2939
61
1.29
6.0 ug/L
7.7 ug/L
10
Cyanide
Date
1 1/12/2010
2 2/9/2010
3 3/9/2010
4 4/13/2010
5 5/25/2010
6 6/22/2010
7 7/20/2010
8 8/10/2010
9 9/7/2010
10 10/19/2010
11 11/16/2010
12 12/30/2010
13 1/11/2011
14 2/15/2011
15 3/1/2011
16 4/12/2011
17 5/17/2011
18 6/9/2011
19 7/12/2011
20 8/2/2011
21 9/20/2011
22 10/11/2011
23 11/1/2011
24 12/6/2011
25 1/10/2012
26 1/31/2012
27 2/7/2012
28 3/13/2012
29 4/10/2012
30 5/15/2012
31 6/12/2012
32 7/3/2012
33 8/21/2012
34 9/4/2012
35 10/2/2012
36 11/6/2012
37 12/4/2012
38 1/3/2013
39 2/22/2013
40 3/7/2013
41 4/4/2013
42 5/9/2013
43 6/6/2013
44 7/2/2013
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
Data
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
BDL=1/2DL Results
5 Std Dev.
5 Mean
5 C.V.
5 n
5
5
5
5 Max.
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
11 11 (tY'^O`/
5 5 piscc,
5 5
5 5
5 5
5 5
5 5
5 5
5 5
5 5
5 5
5 5
5 5
5 5
USE ONLY
"PASTE
SPECIAL -
Values" WITH
"COPY"
0.9045
5.14
0.1761
44
Mult Factor = 1.20
Max. Value 11,0 ug/L
Pred Cw 13.2 ug/L
L�6
f AA".
rsa
-1-
NC0048879 RPA-FreshwaterREV.xlsm, data
1/13/2014

REASONABLE POTENTIAL ANALYSIS
•
11
Fluoride
Date
1/12/2010
2/9/2010
3/9/2010
4/13/2010
5/25/2010
6/22/2010
7/20/2010
8/10/2010
9/7/2010
10/19/2010
11/16/2010
12/30/2010
1/11/2011
2/15/2011
3/1/2011
4/12/2011
5/17/2011
6/9/2011
7/12/2011
8/2/2011
9/20/2011
10/11/2011
11/1/2011
12/6/2011
1/10/2012
1/31/2012
2/7/2012
3/13/2012
4/10/2012
5/15/2012
6/12/2012
7/3/2012
8/21/2012
9/4/2012
10/2/2012
11/6/2012
12/4/2012
1/3/2013
2/22/2013
3/7/2013
4/4/2013
5/9/2013
6/6/2013
7/2/2013
Data
t3uu
800
700
800
500
900
800
1000
1500
500
1100
1100
1000
900
800
600
800
700
500
700
800
800
700
1000
700
5
700
760
740
740
710
500
640
580
620
690
790
640
750
740
660
540
760
700
BDL=1l2DL Results
800 Std Dev.
800 Mean
700 C.V.
800 n
500
900 Mult Factor =
800 Max. Value
1000 Max. Pred Cw
1500
500
1100
1100
1000
900
800
600
800
700
500
700
800
800
700
1000
700
5
700
760
740
740
710
500
640
580
620
690
790
640
750
740
660
540
760
700
USE ONLY
"PASTE
SPECIAL -
Values" WITH
"COPY"
217.4519
744.6591
0.2920
44
1.35
1500.0 ug/L
2025.0 ug/L
12
Lead
Date Data
1 1/12/2010 r
2 2/9/2010
3 3/9/2010
4 4/13/2010 4i
5 5/25/2010
6 6/15/2010
7 7/19/2010
8 8/10/2010
9 9/8/2010
10 10/19/2010
11 11/23/2010 ,iG
12 12/23/2010
13 1/11/2011 N
14 2/15/2011 #7
15 3/1/2011 n*:
16 4/12/2011
17 5/26/2011
18 6/9/2011 4
19 7/12/2011
20 8/2/2011
21 8/25/2011 �r
22 8/30/2011
23 9/6/2011
24 9/13/2011
25 9/20/2011
26 9/27/2011 4'
27 10/11/2011 4-
28 10/18/2011 ',
29 10/20/2011
30 11/1/2011
31 11/3/2011
32 11/15/2011
33 11/22/2011
34 11/29/2011
35 12/6/2011
36 12/13/2011
37 1/3/2012
38 1/10/2012
39 1/18/2012
40 1/24/2012
41 1/31/2012 C;'-'
42 2/7/2012
43 2/9/2012 S
44 2/14/2012 :y0
45 2/28/2012 0
46 3/6/2012
47 3/13/2012
48 3/15/2012
49 3/27/2012
50 4/3/2012 1 t
51 4/10/2012
52 4/12/2012
53 4/17/2012
54 4/24/2012
55 5/1/2012
56 5/15/2012
57 5/17/2012
58 5/22/2012
59 5/29/2012 t'
60 6/5/2012
61 6/12/2012
62 6/19/2012.
63 6/26/2012
64 7/5/2012
65 7/10/2012
66 7/17/2012
67 7/24/2012
68 8/7/2012
69 9/4/2012
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
USE ONLY
"PASTE
SPECIAL -
Values" WITH
"COPY"
BDL=1/2DL Results
5 Std Dev. 6.6476
5 Mean 5.7152
5 C.V. 1.1631
5 n 79
5
5 Mult Factor = 1.99
5 Max. Value 64.0 ug/L
5 Max. Pred Cw 127.4 ug/L
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5 tt__'�
fe-c `
64 645 err • ( r CA f
10 5 L % k iR� I✓
10 5
10 5
10 5
10 5
10 5
10 5
10 5
10 5
10 5
10 5
10 5
10 5
10 5
10 5
10 5
10 5
10 5
10 5
10 5
10 5
10 5
10 5
10 5
10 5
10 5
10 5
10 5
-1-
NC0048879 RPA-FreshwaterREV.xlsm, data
1/13/2014

REASONABLE POTENTIAL ANALYSIS
70
71
72
73
74
75
76
77
78
79
2ec a( onih
70
71
72
73
74
75
76
77
78
79
10/3/2012 10
11/13/2012 10
12/4/2012 10
1/3/2013 5
2/22/2013 10
3/30/2013 10
4/4/2013 4 10
5/14/2013 10
6/11/2013 t. 10
7/2/2013 •:k 10
5
5
5
2.5
5
5
5
5
5
5
NC0048879 RPA-FreshwaterREV.xlsm, data
- 2 - 1/13/2014

REASONABLE POTENTIAL ANALYSIS
14
Molybdenum
Date Data BDL=1/2DL Results
1 1/12/2010 5 2.5 Std Dev. 0.8537
2 2/9/2010 5 2.5 Mean 2.6923
3 3/9/2010 5 2.5 C.V. 0.3171
4 4/13/2010 5 2.5 n 78
5 5/25/2010 5 2.5
6 6/15/2010 5 2.5 MultFactor= 1.26
7 7/19/2010 7 7 Max. Value 7.0 ug/L
8 8/10/2010 7 7 Max. Pred Cw 8.8 ug/L
9 9/8/2010 5 2.5
10 10/19/2010 5 2.5
11 11/23/2010 5 2.5
12 12/23/2010 5 2.5
13 1/11/2011 5 2.5
14 2/15/2011 5 2.5
15 3/1/2011 5 2.5
16 4/12/2011 5 2.5
17 5/26/2011 5 2.5
18 6/9/2011 5 2.5
19 7/12/2011 5 2.5
20 8/2/2011 6 6
21 8/25/2011 5 5
22 8/30/2011 5 2.5
23 9/6/2011 5 2.5
24 9/13/2011 5 2.5
25 9/20/2011 5 2.5
26 9/27/2011 5 2.5
27 10/11/2011 5 2.5
28 10/18/2011 5 2.5
29 10/20/2011 5 2.5
30 11/1/2011 5 2.5
31 11/3/2011 5 2.5
32 11/15/2011 5 2.5
33 11/22/2011 5 2.5
34 11/29/2011 5 2.5
35 12/6/2011 5 2.5
36 12/13/2011 5 2.5
37 1/3/2012 5 2.5
38 1/10/2012 5 2.5
39 1/18/2012 5 2.5
40 1/24/2012 5 2.5
41 2/7/2012 5 2.5
42 2/9/2012 5 2.5
43 2/14/2012 5 2.5
44 2/28/2012 5 2.5
45 3/6/2012 5 2.5
46 3/13/2012 5 2.5
47 3/15/2012 5 2.5
48 3/27/2012 5 2.5
49 4/3/2012 5 2.5
50 4/10/2012 5 2.5
51 4/12/2012 5 2.5
52 4/17/2012 5 2.5
53 4/24/2012 5 2.5
54 5/1/2012 5 2.5
55 5/15/2012 5 2.5
56 5/17/2012 5 2.5
57 5/22/2012 5 2.5
58 5/29/2012 5 2.5
59 6/5/2012 5 2.5
60 6/12/2012 5 2.5
61 6/19/2012 5 2.5
62 6/26/2012 5 2.5
63 7/5/2012 5 2.5
64 7/10/2012 5 2.5
65 7/17/2012 5 2.5
66 7/24/2012 5 2.5
67 877/2012 5 2.5
68 9/4/2012 5 2.5
69 10/3/2012 5 2.5
USE ONLY
"PASTE
SPECIAL -
Values" WITH
"COPY"
18
1
Date Data
1/12/2010
2/9/2010
3/9/2010
4/13/2010
5/25/2010
6/15/2010
7/19/2010
8/10/2010
9/8/2010
10/19/2010
11/23/2010
12/23/2010
1/11/2011
2/15/2011
3/1/2011
4/12/2011
5/26/2011
6/9/2011
7/12/2011
8/2/2011
8/25/2011
8/30/2011
9/6/2011
9/13/2011
9/20/2011
9/27/2011
10/11/2011
10/18/2011
10/20/2011
11/1/2011
11/3/2011
11/15/2011
11/22/2011
11/29/2011
12/6/2011
12/13/2011
1/3/2012
1/10/2012
1/18/2012
1/24/2012
1/31/2012
2/7/2012
2/9/2012
2/14/2012
2/28/2012
3/6/2012
3/13/2012
3/15/2012
3/27/2012
4/3/2012
4/10/2012
4/12/2012
4/17/2012
4/24/2012
5/1/2012
5/15/2012
5/17/2012
5/22/2012
5/29/2012
6/5/2012
6/12/2012
6/19/2012
6/26/2012
7/5/2012
7/10/2012
7/17/2012
7/24/2012
8/7/2012
9/4/2012
BDL=1/2DL Results
135 Std Dev. 15.0725
52 Mean 52.8481
65 C.V. 0.2852
100 n 79
61
39 Mult Factor = 1.23
47 Max. Value 135.0 ug/L
42 Max. Pred Cw 166.1 ug/L
47
47
56
65
70
65
56
42
40
50
34
38
41
39
44
37
43
41
49
48
49
51
39
48
52
49
50
57
57
56
57
59
3
58
57
67
49
47
56
52
48
55
55
52
64
58
68
62
55
67
65
52
50
53
56
45
37
42
47
53
49
USE ONLY
"PASTE
SPECIAL -
Values" WITH
"COPY"
NC0048879 RPA-FreshwaterREV.xlsm, data
- 1 - 1/13/2014

REASONABLE POTENTIAL ANALYSIS
/Yt o C C d n'f `t n t.. L L)
70
71
72
73
74
75
76
77
78
79
11/13/2012 < 5
12/4/2012 < 5
1/3/2013 < 5
2/22/2013 < 5
3/30/2013 < 5
4/4/2013 < 5
5/14/2013 < 5
6/11/2013 < 5
7/2/2013 < 5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2
70
71
72
73
74
75
76
77
78
79
10/3/2012
11/13/2012
12/4/2012
1/3/2013
2/22/2013
3/30/2013
4/4/2013
5/14/2013
6/11/2013
7/2/2013.
45
61
67
62
53
67
60
44
33
44
45
61
67
62
53
67
60
44
33
44
-2-
NC0048879 RPA-FreshwaterREV.xlsm, data
1/13/2014

EFFLUENT ANALYSIS
(NC0048879)
Ammonia
1) -. 7/12*0.5 mg/L + 5/12*1 mg/L = 0.708333 mg/L weighted, annual monthly average
0.354167 = 50% of wt. annual monthly average
0.09 three-year average is < 50% of the weighted annual monthly average limit
2) 200% of summer monthly avg. limit = 1 mg/L summer values > 1
2010 2 2011 0 2012 0 2013 0
no more than 13 daily samples exceeded 200% of the monthly average summer limit
200% of winter monthly permit limit = 2 mg/L winter values > 2
2010 0 2011 0 2012 0 2013 0
no daily samples exceeded 200% of monthly average winter limit
3) no more than two weekly average limit violations in 2012 or 2013(zero shown)
Reduce Monitoring Frequency for NH3-N to 2lweek
Suspended Solids
1) 30 mg/L monthly average permit limit
15 = 50% of monthly average permit limit
2.37 three-year average is < 50% of the monthly average permit limit
2) 200% of monthly average permit limit= 60 mg/L
2010 0 2011 0 2012 0 2013 0
no daily samples exceeded 200% of the monthly average limit
3) no more than two weekly average limit violations in 2012 or 2013 (zero on record)
Reduce Monitoring Frequency for TSS to 2lweek
BOD
5.80833 = monthly weighted average
2.9 = 50% of wt. annual monthly average ((7/12)*4.1+(5/12)*8.2))
2.00 three-year average is < 50% of the weighted annual monthly average limit
200% of summer monthly avg. limit = 8.2 summer values > 8.2
200% of winter monthly permit limit = 16. winter values > 16.4
2010 0 2011 0 2012 0 2013 0
no daily samples exceeded 200% of monthly average summer or winter limit
no more than two weekly average limit violations in 2012 or 2013 (zero on record)
Reduce Monitoring Frequency for BOD5 to 2/week
1)
Fecal
1.1 geo average 2010-2013
< 100/100mL or 50 % of permit limit
2) 200% of 400/100 mL = 800/100mL
2010 0 2011 0 2012 0 2013 0
no daily samples > 200% of permit limit
3) no more than two weekly average limit violations in past two years (zero on record)
Reduce monitoring Frequency for fecal coliform to 2/week

2012 North Carolina 303(d) List -Category 5
Neuse River Basin
> AU Number
Name
10-digit Watershed 0302020108
Description
Length or Area
Crabtree Creek
Units Classification Category
Category Rating Use
Reason for Rating
Parameter
Year
• 27-33-12-(1)
Hare Snipe Creek (Lake
Lynn)
From source to dam at Lake Lynn
2.0 FW Miles B;NSW 5
5 Impaired Aquatic Life
Poor Bioclassification Ecological/biological Integrity Benthos
1998
> 27-33-12-(2)
Hare Snipe Creek
From dam at Lake Lynn to Crabtree Creek
2.5 FW Miles C;NSW 5
5 Impaired Aquatic Life
Poor Bioclassification Ecological/biological Integrity Benthos
1998
> 27-33-14a
Mine Creek
From source to Shelly Lake
3.3 FW Miles C;NSW 5
5 Impaired Aquatic Life
Fair Bioclassification Ecological/biological Integrity Benthos
1998
> 27-33-14b
Mine Creek
FromShelly Lake to Crabtree Creek
1.5 FW Miles C;NSW 5
5 Impaired Aquatic Life
Poor Bioclassification Ecological/biological Integrity Benthos
1998
12-digit Subwatershed
030202010801
Upper Crabtree Creel
> 27-33-(1)
Crabtree Creek
From source to backwaters of Crabtree Lake
5.1 FW Miles C;NSW 5
5 Impaired Aquatic Life
Poor Bioclassification Ecological/biological Integrity Benthos 1998
> 27-33-(3.5)a
Crabtree Creek
(Crabtree Lake)
From backwaters of Crabtree Lake to Cary WWTP
6.8 FW Miles B;NSW 5
5 Impaired Aquatic Life
Standard Violation
Turbidity
5 Impaired Fish Consumption Standard Violation PCB
2008
2008
> 27-33-(3.5)b
Crabtree Creek
(Crabtree Lake)
From Cary WWTP to mouth of Richlands Creek
5.4 FW Miles B;NSW 5
Impaired
Fish Consumption Standard Violation PCB
1998
> 27-33-4
Brier Creek
From source to Crabtree Lake, Crabtree Cr.
6.5 FW Miles C;NSW 5
5 Impaired Fish Consumption Standard Violation PCB
2008
Friday, August 24, 2012
Approved by EPA August 10, 2012
Page 63 of 170

Whole Effluent Toxicity Testing and Self Monitoring Summary
Carolina Cleen Power WWTP NC0058271/003
Ceri7dPF Begin: 3/1/2007 chr lim: 90%
County: Duplin
NonComp: Single
Region: WIRO Basin: CPF22 Feb May Aug Nov SOC_JOC:
7Q10: 0.0 PF: NA IWC: 90 Freq: Q
J F M A M J 1 A S 0 N D
2008 * Pass * * H * * H * * Pass
2009 * Pass * * Pass * * Pass * * Pass *
2010 * Pass * * Pass * * Pass * * Pass
2011 * Pass * Pass * * Pass * * Pass
2012 * Fail >100 >100 Pass * * Fail >100 >100 Pass *
2013 * Pass * Pass * * Pass * * *
Carolina Trace Subdivision WWTP NC0038831/001 County: Lee Region: RRO Basin: CPF13 Jan Apr Jul Oct SOC_IOC:
Ceri7dPF Begin: 1/1/2007 chr lim: 68% @ 0.675 + NonComp: Single 7Q10: 0.49 PF: 0.325 IWC: 76.0 Freq: Q
J F M A M J 1 A S 0 N D
2008 H * * H * * H Pass * Pass *
2009 Pass * * Pass * Pass * * Pass *
2010 Pass * * Pass * * Pass * * Pass * *
2011 Pass * * Pass * * Pass * * Pass *
2012 Pass * • Pass * * Pass * * Pass * *
2013 Pass * * Fail >100 >100 Pass * * Fail * *
Cary North WWTP NC0048879/001 County: Wake Region: RRO Basin: NEU02 Feb May Aug Nov SOC_JOC:
Ceri7dPF Begin: 10/1/2003 chr lim: 90% NonComp: Single 7Q10: 0.30 PF: 12.0 IWC: 90 Freq: Q
J F M A M 1 1 A S 0 N D
•, 2008 * Pass * * Pass * * Pass * * Pass *
[ 2009 * Pass * * Pass * * Pass * * Pass *
2010 * Pass * * Pass Pass * * Pass *
2011 * Pass * Pass * Fail Pass Pass Pass "
2012 * Fail >100 >100 Pass * Pass(s) >100(P) * Pass(s) >100(P)
2013 * Pass * Pass(s) * * Pass(s)`
Cary South WWTP NC0065102/001 County: Wake Region: RRO Basin: NEU02 Feb May Aug Nov SOC_IOC:
Ceri7dPF Begin: 5/1/2008 chr lim: 90% @ 12.8 NonComp: Single 7Q10: 0,3 PF: 12.8 IWC: 98.5 Freq: Q
J F M A M I I A 5 0 N D
2008 * Pass * Pass * * Pass * * Pass
2009 * Pass * Pass * Pass * * Pass •
2010 * Pass * Pass * * Pass * * Pass
2011 * Pass Pass * Pass >100(P) Pass * * Pass
2012 * Pass * * Pass * * Pass * * Pass *
2013 * Pass * * Pass * * Pass * * *
Page 18 of 147

PUBLIC WORKS AND UTILITIES
March 2, 2013
Julie Grzyb
Environmental Engineer,
Complex NPDES Permitting Unit
1617 Mail Service Center
Raleigh, NC. 27699-1617
Subject: NPDES Permit NO. NC0048879 Monitoring Frequency Reductions Response
Comments for Correspondence dated February 18, 2013
Dear Ms. Grzyb,
The Town of Cary would like to submit, for your further review, responses to the questions
contained in the NC DENR letter dated February 18, 2013.
1. The facility has no more than one civil penalty assessment for the permit limit violations
for each target parameter during the previous three years.
The North Cary Water Reclamation Facility (WRF) does not have any civil penalty
assessments for permit violations for any target parameters in the previous three
year period.
2. Neither the permittee nor any of its employees have been convicted of criminal violations
of the Clean Water Act within the previous five years.
Neither the permittee nor any of the employees at the North Cary WRF have been
convicted in the last five years of criminal violations of the Clean Water Act.
3. The facility is not currently under an SOC for target parameter effluent limit
noncompliance.
The North Cary WRF is not under a special order by consent (SOC) for target
parameter effluent limit noncompliance.
4. The facility is not on the EPA's Quarterly Noncompliance Report for target parameter
limit violations.
The North Cary WRF is not on the EPA's Quarterly Noncompliance Report for
target parameter limit violations.
TOWN Of CARY
1900 Old Reedy Creek Road • Cary, NC 27513 • PO Box 8005 • Cary, NC 27512-8005
tel [phone] • fax [phone] • www.townofcary.org

Julie Grzyb
March 2, 2013
Page 2.
5. For BODs, CBODs, NH3-N and TSS, the three year arithmetic mean of effluent data
must be less than fifty percent of the monthly average permit limit. For fecal coliform or
enterococci, the three year geometric mean must be less than 50 percent of the monthly
average permit limit. For parameters with summer and winter limits, an annual arithmetic
mean of the season limits may be used in the calculation.
The North Cary WRF effluent three year arithmetic mean for CBODs, NH3-N, and
TSS is less than 50% of the monthly seasonally adjusted permit limit. The fecal
coliform three year geometric mean is less than 50% of the monthly average permit
limit.
North Cary :WRF: (NC0048879) Effluent Data
CBOD5
mg/L
Fecal Coliform
cfu/100m1
TSS
mg/L
NH3-N
mg/L
3 Year (Avg.)
0.117
0.037
0.023
3 year Geometric mean
1.461
Permit Limit - Monthly Avg.
(Seasonally adjusted - CBOD & NH3)
5.81
200
30
0.707
% 3 Yr Avg./Permit Limit
2%
0.7%
0.1%
3%
6. With the exception of fecal coliform or enterococci, no more than 15 daily sampling
results over the 3-year review period can be over 200% of the monthly average limit for
BODs, CBODs, TSS, or NH3-N. Values associated with the documented impacts of
extreme weather or events beyond the control of the permittee will not be included.
There are no sampling results for CBOD, TSS, or NH3-N in excess of 200%
recorded in the past three years at the North Cary WRF.
North Cary WRF (NC0048879) Effluent Data
CBOD5
mg/L
TSS
mg/L
NH3-N
mg/L
Permit Limit - Monthly Avg.
(Seasonally adjusted - CBOD & NH3)
5.81
30
0.707
3 Year (Max. Value)
2.73
4.1
1.27
% 3 Yr Max Day/Permit Limit
47%
14%
180%
7. For Fecal coliform or enterococci, no more than 20 daily sampling results may be over
200% of the weekly average limit. Values associated with the documented impacts of
extreme weather or events beyond the control of the permittee will not be included.
There are no sample results for Fecal coliform in excess of 200% of the weekly
average limit recorded during the past three years at the North Cary WRF.
North Cary WRF (NC0048879) Effluent Data
Fecal Coliform
cfu/100m1
Permit Limit - Weekly Avg.
400
3 Year (Max. Value)
260
% 3 Yr Max Day/Permit Limit
65%

Julie Grzyb
March 2, 2013
Page 3.
8. For the four target parameters, sampling results shall not show more than two non -
monthly (weekly) average limit violations during the previous year.
The North Cary Water Reclamation facility had no (weekly) average limit violations
during the previous year.
North Cary WRF (NC0048879) Effluent Data
CBOD5
mg/L
Fecal Coliform
cfu/100m1
TSS
mg/L
NH3-N
mg/L
Permit Limit Weekly
(summer/winter)
6.0/12.3
400
45
1.5/3.0
Max recorded value in the
past 12 months
0.00
260
0.00
0.34
9. Reduced effluent monitoring must not impair assessment of sensitive downstream uses,
such as endangered species.
The Town of Cary is not aware of any downstream use or assessment that would
prohibit the reduction in effluent monitoring for CBOD, TSS, NH3-N and Fecal
Coliform from the current daily monitoring requirement.
In meeting the criteria in the NC DWQ Guidance Regarding the Reduction of Monitoring
Frequencies in NPDES Permits for Exceptionally Performing Facilities, the Town of Cary
hereby requests a 2/week effluent monitoring frequency for CBOD5, TSS, NH3-N, and Fecal
Coliform at the North Cary WRF. Please note that the North Cary WRF Permit #NC0048879 is
currently under review by NCDENR as part of the NPDES renewal process.
If you have any additional questions, or desire any additional information, please contact me at
919-469-4303 or e-mail me at Jamie.Revels@a,TownofCary.org.
Respectfully Submitted,
ie Revels, P.E.
tilities Director
Cc: Paul Ray, North Cary WRF Manager and ORC

TOWN Of CARY
January 3, 2013
Julie Grzyb
Environmental Engineer
Complex NPDES Permitting Unit
1617 Mail Service Center
Raleigh, NC 27699-1617
Subject: NPDES Permit No. NC0048879 Renewal
Second Species Toxicity Summary
Dear Mrs. Grzyb,
Please find enclosed the results summary for the second species toxicity testing performed on effluent waters
discharged from the North Cary Water Reclamation Facility, NPDES NC0048879, as required for permit renewal by EPA
form 2A. If you have any questions, please contact me by phone at [phone] or email at
[e-mail].
Sincerely,
Paul Ray
Plant Manager
North Cary Water Reclamation Facility
1900 Old Reedy Creek Road
Cary, NC 27513
[phone]
1900 Old Reedy Creek Rd. • Cary, NC 27513 • PO Box 8005 • Cary, NC 27512-8005
te1 919-677-0850 www.townofcary.org

Summary of Second Species Effluent Toxicity Testing
North Cary Water Reclamation Facility
NPDES NC0048879
May 2012 — December 2012
May 2012
August 2012
0ctober2012
December 2012
Full Range Chronic
Full Range Chronic
Full Range Chronic
Full Range Chronic
Pimephales promelas
Pimephales promelas
Pimephales promelas
Pimephales promelas
PASS ChV <100%
PASS ChV <100%
PASS ChV <100%
PASS ChV <100%

Attachment D
Summary of Correspondence with DWQ
Regarding Second Species toxicity Testing
Authorization was given by NC DWQ to proceed with second species testing for the
months of May, August, October, and December 2012. The results of these tests will not
be available until after the submittal date of September 1, 2012. Upon receipt of the final
analysis results, the data will be forwarded to the permitting section.

•
PUBLIC WORKS AND UTILITIES
February 12, 2013
Julie Grzyb
Environmental Engineer,
Complex NPDES Permitting Unit
1617 Mail Service Center
Raleigh, NC. 27699-1617
Subject: NPDES Permit No. NC0048879
Reduced frequency of monitoring based on "exceptional facility" data. justification
Dear Ms. Grzyb:
The Town of Cary would like to request a reduction in the frequency of monitoring for BOD, TSS, NH3,
and bacteria at the North Cary Water Reclamation Facility. Permit # NC0048879 is currently under
review by DWQ as part of the NPDES renewal process. The request for reduced sampling is based on
the previous three years of effluent data and the facility meeting the "exceptional facility" criteria. The
data for the three previous years has been reviewed and appears to meet the following criteria:
• Effluent sample result must be <50% of the effluent limits as a three year average.
• With the exception of fecal coliform, no more than 15 daily sampling results over the 3-year
review period can be over 200% of any limit.
• Fecal coliform, no more than 20 sampling results can be over 200% of the weekly average limit.
Effluent
Fecal
Coliform
Effluent Effluent Effluent
CBOD TSS Ammonia
/100m1
MG/L
MG/L
MG/L
Avg*
0.120508
0.0382353
0.0238195
Max
260
Limit
400
4.1
30
0.5
Criteria
<800
<2.05
<15
<0.25
Criteria Met
Yes
Yes
Yes
Y
*Based on data from sampling years 2010 — 2012
TOWN Of CARY
400 James Jackson Avenue • Cary, NC 27513 • PO Box 8005 • Cary, N ► 12-8005
tel [phone] • fax [phone] • www.townofcary.org

Julie Grzyb
February 12, 2013
Page 2
If you have any questions, or desire any additional information, please contact me at 919-469-4303 or
e-mail me at [e-mail].
Sincerely,
mie Revels,
Utilities Director

Regional Office SWP Staff Report Form:
All Permit Information should be verified against BIMs Permit Information, note any discrepancies and correction action needed
All information in BIMs is Correct Yes
Permit Number NC0048879
Permittee Town of Cary
Facility Name North Cary WRF
Regional Office Raleigh
RO Contact person Thomas Ascenzo
Date November 8, 2012
Facility Location 1900 Old Reedy Creek Road, Cary, NC 27513
Equipment description
Mechanical screening, influent pump station, grit and grease removal system, nutrient removal system consisting of anaerobic
selectors, oxidation ditches, anoxic zones, and reaeration zones, dual secondary clarifiers, deep bed sand filters, ultraviolet
disinfection, cascade aeration, belt thickeners, sludge digesters.
Discharge Point(s):
Latitude 35.837778
Longitude -78.780556
Waterbody:
Receiving Stream Crabtree Creek
Stream Classification B;NSW
River Basin Neuse River
Sub -basin
Stream Index 27-33-(3.5)
Effluent limits
Toxicity
Review Permit Enforcement Case
List (July 2007-July 2012)
Count and List the total number of
Enforcement Cases here:
19 Tox Testing passed. 2 Tox Testing failed.
Last inspection 6/6/2012
Review Special Conditions: No special conditions
Sludge Management Plans
Engineering Structural Analysis
Engineering Alternatives
Assessment
Nutrient Management Plan
Wastewater Treatment Management
Plan
Other

Recommendations for renewal of
permit
/Comments/Additions/Deletions:
RRO Supervisor Signature
RRO has no objections to the Town of Cary's WRF facilities permit renewal.

August 15, 2012
Gil Vinzani
Supervisor, Eastern NPDES Permit Program
NCDENR/DWQ
NPDES Unit
1617 Mail Service Center
Raleigh, NC. 27699-1617
Subject: NPDES Permit No. NC0048879
Renewal North Cary WRF
Dear Mr. Vinzani,
DEPARTMENT OF PUBLIC WORKS AND UTILITIES
c=
SEP 1 0 2012
In accordance with North Carolina (NCES) 143-215.1 (c), the Town of Cary is requesting
renewal of the North Cary Water Reclamation Facility permit (NC 0048879). This
submittal is in keeping with the 180 day requirement for a renewal request based on the
February 28, 2013 expiration date. Attached for your review is EPA form 2A (one signed
original and two copies) and the required sludge management plan (Attachment A) (one
signed original and two copies). The additional tests for toxicity (second species) will be
submitted once the last test is complete and the data is available in January 2013.
If you have any questions, or desire any additional information, please contact me at 919-
469-4303 or email me at [e-mail].
Sincerely,
amie Revels, Utilities Director
Town of Cary Public Works and Utilities Department
TOWN of CARP
1900 Old Reedy Creek Road•Cary, NC 27513•PO Box 8005•Cary, NC 27512-8005
tel [phone] • fax [phone]• www.townofcary.org

Attachment A
Biosolids Management Plan
North Cary Water Reclamation Facility
NC 0048879
History
The Town of Cary placed the North Cary Water Reclamation Facility (NCWRF) in
operation in July of 1984. At the time, sludge was dried by dual vacuum assisted drying
beds. The sludge from the drying beds was discarded to local landfills. The vacuum
assisted drying beds worked well at low flows experienced during the first few years of
operation. In the mid 1980's, the Town began investigating land application alternatives
with Dr. Bob Rubin of NC State University. The Town permitted less than 100 acres at a
nearby farm for a portion of its biosolids disposal, while the remainder was hauled to a
landfill for disposal. This worked so well that the Town contracted with a sludge hauling
company shortly thereafter. In the middle of getting sufficient land permitted to make the
Town less dependent on the local landfills for ultimate disposal, the landfills began
refusing dewatered sludge dried in our drying beds. The Town made it a priority to
completely switch to liquid land application in which biosolids were beneficially resused
as a fertilizer and soil amendment for local farmers. Liquid land application was the
main source of beneficial reuse until 2004. In late 2004, the NCWRF contracted with
McGill compost facility to take dewatered sludge processed by a temporary belt press
located onsite at NCWRF. The residuals were transported via trucks to McGill's facility
in Chatham County. This method of disposal served as a transitional phase; until thermal
biosolids drying was made operational.. Construction began on the Andritz Thermal
Biosolids Dryer in March 2004. The facility went online in November 2005 and has been
successfully processing biosolids into a Class A, Exceptional Quality recycled material
since it began operation. The dryer is located at the South Cary Water Reclamation
Facility and serves both of Cary's water reclamation facilities. Liquid biosolids from
NCWRF are hauled to SCWRF with tanker trucks. The biosolids from NCWRF are
blended and stored with biosolids from SCWRF until centrifuge dewatering and drying
which occurs onsite at SCWRF.
Current Solids Handling
The current biosolids management plan at NCWRF includes mechanical thickening
equipment, which thickens waste activated sludge to approximately 2.5% to 3.0% solids.
Thickened solids are then pumped into one of two 750,000 gallon aerated holding tanks.
The thickened sludge is held for about 10 days and then transported to the South Cary
facility. A contract hauler currently transports approximately 45 truck loads per week,
which equates to about 270,000 gallons per week at 2.70% solids. Below is a list of
associated equipment and processes at the NCWRF.
a. Biosolids processing facility, includes (2) two meter gravity belt
thickeners, polymer feed systems, thickened biosolids pumping equipment
and associated appurtenances

b. (2) 0.750 mg aerated holding tanks, diffused air, centrifugal multistage
blowers, additional backup blowers and generators
c. Biosolids loading station, transfer pumps and spill containment
d. Miscellaneous yard piping and SCADA controls, 24 hour video
surveillance
Once the product arrives at SCWRF, the following occurs:
a. The truck / tanker is weighed for accuracy of volume received
b. Product is received and discharged into pump station and blended with
SCWRF sludge
c. Biosolids are further aerated within aerated holding tanks
d. Thickened biosolids are dewatered through high solids centrifuge prior to
drying
e. Dewatered biosolids are conveyed to a direct rotary drying system fueled
by natural gas. Dried material conveyance, cooling, and screening occurs
f. Two product storage silos are available for production needs and storage.
Truck loading and weigh station is included to manage materials handling
operations.
g. Distribution and marketing program includes selling the Class A,
Exceptional Quality product to a third party vendor. Final product is
typically utilized as a soil amendment and fertilizer in commercial
agriculture applications.
Sludge Production and Treatment
The NCWRF has an exceptional pretreatment program that provides protection of its
biosolids quality through the diligent efforts of the Town's pretreatment staff. Cary's
biosolids production meets all pollutant concentrations listed in 40CFR, Part 503. This
material consistently qualifies for exceptional quality designation as determined by
analysis and what is required by state and federal regulations.
At the current average flow of 6.5 MGD, the NCWF is producing approximately 1530
dry tons of biosolids per year. This equates to approximately 13.5 million gallons/year
that is processed by the SCWRF (bio dryer).
Future
The Town of Cary is in the process of developing a Biosolids Master Plan. The Town of
Cary has hired HDR Engineering to oversee development of this plan. HDR is currently
gathering data for determination of long term solutions in future biosolids management
for the North Cary WRF, South Cary WRF and Western Wake WRF.
Town of Cary, North C. oli
B
'e Revels
tilities Director
Public Works and Utilities Department

Attachment B
Summary of Cary's I & I Program
North Cary Water Reclamation Facility
NC0048879
The Town of Cary employs an integrated, basin -by -basin approach to evaluate and eliminate inflow and
infiltration from its wastewater collection system. There are three basic phases to an I &I Elimination
Program; 1) Identifying wastewater basins according to the level of inflow and infiltration present and
prioritizing basins for detailed investigations; 2) Field Investigations in `Basins.of Interest"; and 3)
Corrective Action. Following is a brief description of Cary's program.
Identification and Prioritization of Wastewater Basins
Flow Monitors are used to evaluate wastewater flows within the respective basins, particularly the
collection system's response to significant rain events. Currently, there are 23 "permanent" flow meters
deployed throughout Cary's wastewater collection system. A consulting engineering firm, under contract
with the Town, maintains and calibrates these meters, downloads the data on a monthly basis and
provides a detailed summary for each meter that establishes peak flow, average base flow, ground water
infiltration rates, rainfall -dependent inflow and infiltration and various other parameters. This
information is used to identify the basins with the highest infiltration and inflow rates and to establish
priorities for further field investigation efforts.
Field Investigations
Using the data obtained through the Town's flow monitoring program, collection system investigations
are initiated to identify sources of I & I within the respective basins selected for evaluation. The primary
investigative methods employed are as follows:
1) Manhole inspections: The Town's wastewater collections division inspects all of the
manholes within the basin(s) selected for investigation. An inspection report is
completed for each manhole and the information is entered into a database, which is in
turn linked to the Town's GIS system. This allows staff to clearly identify which
manholes have been inspected and identify locations of manholes needing repair or
rehabilitation.
2) Smoke Testing: Smoke testing is used to identify illicit connections, broken cleanouts,
and faulty joints in porous soils. This work is performed by members of the Wastewater
Collections Division. During the smoke testing process, deficiencies are logged and
repairs are either made by Town staff or by private contractors, depending on their nature
and severity. Defects discovered on private property are noted and the property owners
are notified that corrective action is needed.

3) Sewer Video Inspection: Town staff performs video inspection of sewer lines up to 12
inches in diameter. Pipe deficiencies are documented utilizing WinCan software.
Repairs needing immediate attention are addressed by Town crews or private contractors.
Other repairs and rehabilitation are noted and identified on the Town's GIS system for
inclusion in capital projects. CCTV inspections of large diameter lines are performed
under a professional services contract, which includes cleaning, CCTV inspection and
condition assessment.
Corrective Action
Repairs requiring open -cut excavation to repair structural deficiencies, such as severely offset joints,
faulty service connections, or repairs needing immediate attention to avoid failure are routinely performed
by Town crews. In addition, Town crews work to correct manhole defects, such as frame and cover
replacement, sealing leaks in manhole joints, and securing the cover to the frame to prevent vandalism.
Rehabilitation of manholes and sewer lines are accomplished through the Town's Capital Improvements
Program.

Attachment C
Summary of Effluent Toxicity Testing for
North Cary Water Reclamation Facility
NPDES NC0048879
February 2008 — May 2012
February 2008 Chronic Pass/Fail Ceriodaphnia dubia PASS
May 2008 Chronic Pass/Fail Ceriodaphnia dubia PASS
August 2008 Chronic Pass/Fail Ceriodaphnia dubia PASS
November 2008 Chronic Pass/Fail Ceriodaphnia dubia PASS
February 2009 Chronic Pass/Fail Ceriodaphnia dubia PASS
May 2009 Chronic Pass/Fail Ceriodaphnia dubia PASS
August.2009 Chronic Pass/Fail Ceriodaphnia dubia PASS
November 2009 Chronic Pass/Fail Ceriodaphnia dubia PASS
February 2010 Chronic Pass/Fail Ceriodaphnia dubia PASS
May 2010 Chronic Pass/Fail Ceriodaphnia dubia PASS
August 2010 Chronic Pass/Fail Ceriodaphnia dubia PASS
November 2010 Chronic Pass/Fail Ceriodaphnia dubia PASS
February 2011 Chronic Pass/Fail Ceriodaphnia dubia PASS
May 2011 Chronic Pass/Fail Ceriodaphnia dubia PASS
August 2011 Chronic Pass/Fail Ceriodaphnia dubia FAIL*
September 2011 Phase II Chronic Ceriodaphnia dubia PASS
September 2011 Chronic Pass/Fail Ceriodaphnia dubia PASS
October 2011 Phase II Chronic Ceriodaphnia dubia PASS
October 2011 Chronic Pass/Fail Ceriodaphnia dubia PASS
November 2011 Chronic Pass/Fail Ceriodaphnia dubia PASS
February 2012 Chronic Pass/Fail Ceriodaphnia dubia FAIL*
March 2012 Phase II Chronic Ceriodaphnia dubia PASS
April 2012 Phase II Chronic Ceriodaphnia dubia PASS
May 2012 Chronic Pass/Fail Ceriodaphnia dubia PASS
*Failed Chronic Pass/Fail tests were followed by two consecutive months with Phase II
Chronic tests as required by NPDES permit NC0048879. Repeated tests showed no
toxicity.

Attachment D
Summary of Correspondence with DWQ
Regarding Second Species Toxicity Testing
Authorization was given by NC DWQ to proceed with second species testing for the
months of May, August, October, and December 2012. The results of these tests will not
be available until after the submittal date of September 1, 2012. Upon receipt of the final
analysis results, the data will be forwarded to the permitting section.

North Cary Waste Water Reclamation Facility
Sewer Symbols
Q Sanitary Manhole
• Sanitary Manhole
IN Sanitary Pump Station (TOC)
k Waste Water Treatment Plant
o Sanitary Pump Station (PRIV)
Sewer Lines
Sanitary Sewer Line
Sanitary Sewer Line
Force Main
North Cary WRF
Latitude and Longitude =-78.78, 35.84

Exhibit #1, Aerial View of North Cary Water Reclamation Facility
Scale: 1"=250-ft
Influent Coarse
Bar Screen Structure
Reclaimed Water
Storage Tank and
Pump Station
Ultraviolet
Disinfection
Cascade Aeration

--EFFLUENT DISCHARGE
TO CRABTREE CREEK
INFLUENT PUMP
STATION
it ELECTRICAL
RUILDIN
W�land g2
WELLS s' `\
.. n INFLUENT-,
MECHANICAL
BAR E )rt
� INFLUENT
SAMPLNG-
MANUAL BAR
SCREEN
INFLUENT
MECHANICAL
BAR SCREEN g1
MEr YELLS
L_l / t3 and #4
EMERGENCY
GENERATOR
600 KW
NCWRF Narrative Description of Process
(see process f ow diagram for a schematic outline of the process)
Raw wastewater enters the North Cary Water Redamation Facility at the infuent pump station area immediately
adjacent to Old Reedy Creek Rcad. Preliminary treatment consists of mechanical screening before the flow stream
enters 1 0` the 2 influent pump stations. Influent pump station #1 consists of 4 submersible pumps rated at 15 MGD,
while influent pump station #2 consists of a wet weNdry well pump configuration with 4 pumps rated at 15 MGD.
The influent pumps convey the raw wastewater up to the main plant fadlity where the flow stream is fine screened
through two band screen assemblies. Grit and other debris are collected in trash bins and sent offsite 'or landfilling.
Secondary treatment consists of a Kruger biological nutrient removal process that utilizes anaerobic selectors,
mechanical aeration, anoxl zones and post aeration within a typical oxidation ditch configuration. Immediately
following the BNR process, the mixed liquor Is conveyed to the secondary darifrers, where the settled sludge is
either recirculated through the BNR process or wasted to the gravity belt thickeners.
The clarified effluent is conveyed to tartlary treatment, which consists of deep bed sand filtration and ultraviolet
disinfection. The disinfected effluent is aerated via cascade aerator and either collected for reclaimed water use or
discharged to Crabtree Creek.
Bioscdds are thickened with gravity bet thickeners and temporarily stared in aerated tanks until the biosolids are
transported to the South Cary Water Reclamation Factity for aerobic digestion and thermal dry;ng.
6.61 NGS COMBINED FLOW
00TN FCRCEMAINS�
24• FOELCEMAIN —�-
24" FCRC£MAN
CHEMICAL
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GENERATOR
500 KW
RAS METERING
VAULT
RAS/WAS
PUMP STATION
WAS METERING
VAULT
BLOWER
BUILDING
\-BEEF BED
SAND FILTERS
ACCESS DRIVEWAY
Figure 2
INFLUENT
DISTRIBUTION
INFLDE#I'T "C:" 3.30 MOD
AERATION BASIN
I. TRAIN..C..�
RECLAIMED WATER
PUMP STATION
RECLAIMED WATER
STORAGE TANK
INFLUE44T 'A"
&61 M[A ^
-AAR A
-WF T 3.30 ING,L1
AERATION BASIN
I TRAIN `9'
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6.16 NM
I -EFFLUENT
PARSHALL
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L MAIN
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UV DISINFECTION/
STORAGE •
BUILDING
ELECTRICAL
BUIIDNG
EMERGENCY
GENERATOR
600 KW
TREATED EFFLUENT DISCHARGE 5.70 MGD
RECLAIMED WATER SUPPLY 0_462 MOD F 1
LAB/crww K
BUILDING
MANUAL OPERATED VALVE
t-RAT
7A1$ECY!
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1600 KW
1
EFFLUENT SAMPLER
SCUM
DIGESTER
FLOW EOUAUZATNON
2 MG
MAINTENANCE
BUILDING
CL2 CONTACT TANK
fJ❑ (NOT IN SEWAGE)
NPW PUMP STATION
(NOT IN SERVICE)
`- WATER REUSE rISIRBUTION
DIVERSION BOX
rSTORAGE BUILDING
t L—FLOW EQUALIZATION BLOWER
BACKUP FLOW
EGUALZZATION
2 MG
CLARIFIER
NO. 1
(NOT IN
SERVICE)
SLUDGE LOADING
CONTAINMENT AREA
� r
FILTER BAO<WASR
BLOWER
BUILDING
l
--EMERGENCY
GENERATOR
1000 KW
AERATED
HOLDING 41
0.75 MG
AERATE
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0.75 MG
PUNT COARSE 1 E€ iNFWENT • FlNE
NFWENT BAR
RN�I t PUMP .� M .. EAR
` STATI016 SCREENS I-.-
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LEGEND
M
F
RAS
SC
WAS
FLOW MEASUREMENT
PUMPS
I1L1RAIE
RETURN ACTIYATED SLUDGE
SCUM
WASTE ACTIVATED SLUDGE
IRARTY
F BELT
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(2)
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T.
RAPS/A5 iWRG IIT2D B(N5 0.ARFlFISSGAFILTERS - BARNS 1
+ 3(3) (2)
T
OI.tSIFN
STATION I {7)
GET `
SLUDGE
THICKENING°
BUILDING
1
+nrs
AEROBIC HAULING TO0 8CARP
HOLDING WATER RECLAMATION
N FACILITY
(2) I 81050005 DRYER
PI
UV I
OSINFECIION I
CHANNEL I
(2) .
CASCADE
AERATOR I
(I)
RECLAIMED
WATER
EFFLUENT T0]
CRABTREE
CREEK
NORTH CARY
WATER RECLAMATION FACIUTY
EXISTING FACILITIES
PROCESS FLOW SCHEMATIC
CARY, N.C. 27513
EXISTING FACILITIES SITE PLAN SCHEMATIC
SIGNATURE
REVISIONS
PROJ.#
DESIGN BY: J.R.
DRAWN EY: S.00
DATE: JULY 2012
SCALE:
NOT TO SCALE
SHEET NO.
1 of 1