NC0023884_Permit Issuance_20060828

Michael F. Easley; Governor
State of North Carolina.
Q� QG William G. Ross, Jr., Secretary .
�} Department of Environment and Natural Resources
Alan W. Klimek, P.E., Director
Division of Water Quality
August-28, 2006
Mr. Matt Bernhardt .-
Salisbury -Rowan Utilities .
1 Water Street
Salisbury, North Carolina 28144 - _m
Subject: °NPDES Permit Issuance-
-Permit NCO023884
Salisbury -Rowan WWTP
Rowan County.
Dear Mr. Bernhardt:
Division personnel have reviewed -and approved_ your application for renewal of the '
subject permit: Accordingly, we are forwarding the- attached NPDES discharge permit..
This permit is issued `pursuant'to the requirements of North Carolina General Statute
143-215.1 and the . Memorandum of . Agreement between -North .Carolina .and the U.S.:
Environmental Protection Agency dated May 9, 1994 (or' as subsequently amended):
1 The permit authorizes Salisbury to discharge' up "to 12.5 MGD (as well as an
expansion :phase to 20 MGD) of treated wastewater to the Yadkin -River; a ,class WS-V
water in. the Yadkin Pee Dee River Basin. The permit includes discharge limitations or
monitoring requirements for flow, biochemical oxygen demand (BOD),= total. suspended
solids (TSS), ammonia, fecal coliforlm bacteria, total: residual, chlorine, total nitrogen, total
phosphorus, selenium, and other parameters.
After substantial collaboration and input from the city -of. Salisbury, DWQ; and the
EPA, the final NPDES permit includes the following:
The uistream waste concentration (IWC) for the Salisbury - Rowan VA has
been revised. This is basedon the results of the updated CORMIX'modelf
provided by Salisbury staff in January 2006 (and subsequently reviewed by
- DWQ stag. The model run included revised stream flow information and.a .
naodificationto close two. of the ports on the existing three -port diffuser. (DWQ
received confirmation that the modification . of.the diffuser was completed- in* .
May. 17, 2006): The other variable included" the critical condition -now, being
the lake level of 5 feet below full pool for developing limits for toxicants. Based
on the results of the CORMIX model, ' the -instream waste concentrations are
5.3 % at 12.5 MGD and,4% at 20 MGD..
.The addition- of a special condition requiring a dye study be conducted at low
and high flows in the Yadkin River when the average discharge flow is equal to
80%.of the design flow of 12.5 MGD. See. Special Condition A. (7). ,
No Carolina
North Carolina Division of Water Quality 1617 Mail Service Center Raleigh, NC 27699-1617 Phone [phone] )CtllCQi�1J e
Internet: '%immu waterauality.or_ Location: 512 N. Salisbury St. Raleigh, NC 27604 Fax [phone]
An Equal OpportunilylAffirmOmAction Employer— 5D%Recycledfily%Post Consumer Paper '

Permit NCO023884
STATE OF NORTH CAROLINA
�.. DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY.
PERMIT
TO DISCHARGE WASTEWATER UNDERTHE-
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
In compliance with the provision of North Carolina General Statute '143-215.1, other -lawful standards and regulations
promulgated and adopted by the North Carolina Environmental Management Commission, and the Federal Water
Pollution Control Act, as amended, the
City of Salisbury `.. .
is hereby authorized to discharge wastewater from the facilities located at the
Salisbury -Rowan WWTP .
1915 Grubb -Ferry Road =
Rowan County
gi2�l
and..
850 Heiligtown Road
East Spencer,.
Rowan County
to receiving waters designated as the Yadkin River in the Yadkin -Pee Dee River Basin in accordance with
effluent limitations, monitoring. requirements; and other conditions set forth in Parts I, II, III, and IV . .
hereof.
The permit. shall become effective October 1, 2006:
This permit and the authorization to discharge shall expire at midnight on June 30, 2009.
Signed this day August 28, 2006.,
Alan W. Klimek, P.E.
Division of Water Quality
By Authority of the Environmental Management. Commission

Permit NC002388.4 .
SUPPLEMENT TO PERMIT COVER SHEET
All previous NPDES Permits issued to this facility, whether for operation or discharge are hereby revoked, and as of.
this issuance, any previousli 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 City of Salisbury is hereby authorized to:
1. Continue to operate and maintain the.existing 7.5 MGD Grant/ Creek Wastewater Treatment Train
consisting of
➢ Influent parshall flume_-
➢ Four mechanical bar screens .
➢ - Four grit chambers
➢ Aeration basin with mechanical floating aerators and mixers
➢ Two circular clarifiers and two rectangular clarifiers
➢ Four primary clarifiers
➢ Two trickling filters
➢ Screw pump lift station
➢ Two aerobic digesters
➢ Belt filter press
➢ Standby power generator
➢ Effluent pump station jA�o�
➢ Flow measurement instrumentation Splir� 4oip
This treatment train is located on Grubb Ferry Road near S cer in Rowan County.
2. Continue.to operate and maintain the existing 5.0 MGD Town Creek Wastewater Treatment Train
consisting of:
➢ Two mechanical bar screens
➢ Two grit and grease removal units
➢ Two aeration basins with fixed mechanical aerators and mixers
➢ Two secondary clarifiers
Screw pump lift station
➢ Two aerobic digesters
➢ Standby power generator
- ➢ Flow measurement
➢. Sludge dewatering •facilities.
➢ Effluent pump station
This treatment train is located on Heiligtown Road near East Spencer in Rowan County.'
3. - Continue to operate and maintain an ultraviolet or sodium hypochlorite disinfection system, cascade
post aerator, Parshall flume, effluent sampling station and diffuser at the Yadkin River treatment train.
4.: After receiving an Authorization to Construct from the Division, construct and operate a 20.0 MGD
wastewater treatment system.
5. Discharge from said treatment works at the location specified on the attached map through Outfall 001
into the Yadkin River, currently classified WS-V waters in the Yadkin -Pee Dee River Basin.

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Salisbury -Rowan WWTP
State Gdd/Ouad: E17NW/Salisbury Latitude: 35. 44' 07" N
Loneitude: 80.26' 50" W
Receivine Stream: Yadkin River Drainmee Basin: Yadkin
Stream Class: WS-V Sub -Basin: 03-07-04
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NPDES Permit No. NC0023884
iVOrth Rowan County

Permit NC0023884
A. (1) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (12.5 MGD)
During the period beginning on, October 1, 2006 and lasting until expansion beyond 12.5_ MGD, the Permittee is
authorized to discharge from Outfall 001. Such discharges shall be limited and monitored by the Permittee as
specified below.
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µPre uenc 'F i �:�_ ON
Flow
12.5MGD6
Continuous
Recording
Influent or Effluent
BOD, 5 day, 20 °C
(April 1 to October 31 5
15.0 mg/L.
22.5 mg/L
Daily
Composite
Influent and Effluent
BOD, 5 day, 20 °C-
November 1 to March 31 5
30.0 mg/L
45.0 mg/L
Daily
Composite
Influent and Effluent
Total Suspended Solids5
30.0 mg/L
45.0 mg/L
Daily
Composite
Influent and Effluent-
NH3 as N
(April 1 to October 31
6.0 mg/L
18.0 mg/I
Daily
Composite
Effluent
NH3 as N
November 1 to March 31
12.0 mg/L
35.0 mg/I
Daily
Composite
Effluent
Dissolved Oxygen2 -
Daily
Grab
Effluent--.
Fecal Colifohm
geometric mean
200/100 ml
400/100 ml
Daily
Grab
Effluent
Temperature
Daily -
Grab
Effluent
pH
> 6.0 and < 9.0 standard units
Daily
Grab
Effluent
Total Residual Chlorine3
28 Ng/L
Daily
Grab
Effluent
Total Nitrogen
(NO2 + NO3 + TKN)
Weekly.
Composite
Effluent
-Total Phosphorus
Weekly
Composite
Effluent
Total Silver
Monthly
Composite
Effluent
Total Copper
Monthly
Composite
Effluent
Total Zinc
Monthly
Composite
Effluent
Total Selenium7
Monthly
: = Composite
Effluent
Total Selenium8
95 Ng/L
Weekly
Composite
Effluent
Effluent Pollutant Scan9
9
9
Effluent
Chronic To)(idty4Quarterly
Composite
Effluent -
Notes:
1. Combined effluent from the Grant Creek and Town Creek treatment trains, except that flow, BOD, and TSS shall be
sampled separately at the Town Creek treatment train and the -Grant Creek treatment train. BOD and TSS removal
efficiency shall be calculated -by mathematically aggregating the values for the'Grant Creek and the Town Creek treatment
train. (Refer to A. (6).)
2. _ The daily average dissolved oxygen effluent concentration shall not be less than 5.0 mg/L.
3. Monitoring only applies if chlorine is added to the treatment system.
4. Chronic Toxicity limit (Ceriadaphnia) at 5.3 % with testing in Maazch, June, September and December (see A. (4)).
5. The monthly average effluent BODS and Total Suspended Solids concentrations shall not exceed 15% of the respective
influent value (85% removal)., .
6. 7.5 MGD at Grant Creek treatment train. 5.0 MGD at Town Creek treatment train.
7. Monitoring requirement may be deleted upon written notification from the permitting authority. ,
8. The limitation for total selenium will take effect April 1, 2008. -This limit may be deleted upon written notification from the
permitting authority.
9. Effluent pollutant scan must be done three times with seasonal variation before next permit application. See A. (8).
There shall be no discharge of floating solids or visible foam in other than trace amounts.

Permit NCO023884
A. (2) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (20 MGD)
During the period beginning after expansion beyond 12.5 MGD and lasting until expiration, the Pern ittee is - -
-authorized to discharge from Outfall 001. Such discharges shall be limited and monitored by the Permittee as
specified below
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Flow r
20 MGD
Continuous
Recording
Effluent
BOD, 5 day, 20 °C
- 5.0 mg/L
7.5 mg/L
Daily
Composite .
Influent and Effluent
(April 1 to October 31 5
_BOD, 5 day, 20 °C
10.0 mg/L
15.0 mg/L
_
Daily
Composite
Influent and Effluent
November 1 to March 31 5
Total Suspended Solids5...
30.0 mg/L
45.0 mg/L
Daily
Composite
Influent and Effluent
NH3 as N
1.0 mg/L
3.0 mg/L
Daily
Composite
Effluent
(April 1 to October 31
NH3. as N -
2.0 mg/L
6.0 mg/L
Daily
Composite l
Effluent
Novmber 1 to March 31
_
Dissolved Oxygen2
-
Daily
Grab
Effluent .
Fecal Coliform
200/100 ml
400/100 ml
Daily
Grab
Effluent
geometric mean
Temperature,
Daily
Grab
Effluent
pH
> 6.0 and < 9.0 standard units
Daily
Grab .
Effluent
Total Residual Chlorine3
28 Ng/L
= Daily
Grab- °
Effluent
Total Nitrogen
Weekly
Composite . _
Effluent
(NO2 + NO3 + TKN)
Total Phosphorus
Weekly
Composite
Effluent
Total Silver
Monthly
Composite
Effluent
Total Copper
Monthly
Composite
Effluent .
Total Zinc
Monthly
Grab
Effluent
Total Selenium6
Monthly
Composite
Effluent
Total Selenium7.
124 pg/L
Weekly
Grab
Effluent
Effluent Pollutant Scan8
8
8
Effluent
Chronic Toxicity4
Quarterly
Composite
Effluent.
Notes:
1. Sample locations: Effluent -Combined Effluent from Grant Creek/ and Town Creek
2. The daily average dissolved oxygen effluent concentration shall not be less than 5.0 mg/L.
3. 'Monitoring only applies if chlorine is added to the treatment system for disinfection.
4. Chronic Toxicity limit (Ceriodaphnia) at 4 % with tests in March, June, September and December (see A. (5)).
5; The monthly average effluent BODS and Total Suspended Solids concentrations shall not exceed_ 15% of the respective
influent value (85% removal).
6. Monitoring requirement may be deleted upon written notification from the permitting authority.
7. The limitation for total selenium will take effect April 1, 2008. This limit may be deleted upon written notification from the
permitting authority.
8. Effluent pollutant scan must be done three times with seasonal variation before next permit application. See -A. (8).
There shall be no discharge of floating solids or visible foam in other than trace amounts. -

Permit NCO023884
A. (3) INSTREAM MONITORING -REQUIREMENTS
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PARAMETER
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2*- 'C i y CY 4Y
� 1VIOIVITORING3REQUmtEWNTS
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;Dissolved Oxygen-
June -September
3/week
Grab
Upstream & Downstream
October -Ma
1/week
PH
June -September
3/week
Grab
Upstream & Downstream
October -Ma
1/week
Temperature -
June -September
3/week
Grab
Upstream & Downstream
October -Ma
1/week - -
Total Phosphorus -
June -September
1/month
Grab
Upstream & Downstream
�NOz+NO3
June -September
1/month
Grab
U stream & Downstream
'NH3 as N
June -September
1/month
Grab
Upstream & Downstream
tTotal K•eldahl Nitrogen
. June -September
1/month
- Grab .
Upstream & Downstream
fiChloro h II -a
June -September
1/month
Grab
Downstream .
Notes
Upstream = at least 200 feet upstream of the discharge. point
Downstream = 0.7 miles above Southern Railroad Bridge.
As a participant in the Yadkin Pee -Dee River Basin Association, the instieam monitoring requirements as `
stated above are waived: Should your membership in -the agreement be terminated; you shallnotify the
Division immediately and the instream monitoring reqwrements specified in your permit shall be reinstated.
As per 15A NCAC 2B.0505 (c):(4); stream -sampling may be discontinued at such .time as flow conditions -in
the receiving waters or extreme weather conditions will result in a substantial risk -of injury or, death to
persons collecting 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 shall be strictly construed and may not .be utilized to avoid the -requirements of
15A NCAC 2B.0500 when performance of these requirements -is attainable. When sampling is discontinued
pursuant to this provision, stream. sampling shall be resumed at the -first opportunity after the risk period has
ended.

Permit NC0023884
A. (4) CHRONIC TOXICITY PERMIT. LIMIT (QRTRLY) at 12.5 MGD
The effluent discharge shall at no time exhibit observable inhibition of reproduction or significant mortality to .
Ceriodaphnia dubia at an effluent concentration of 5.3%.
The permit holder shall per -form at a minimum, u� artery monitoring using test procedures outlined in the "North
Carolina Ceriodaphnia Chronic Effluent Bioassay Procedure," Revised February 1998, or subsequent versions or
"North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure" (Revised -February 1998) or subsequent
versions. The tests will be performed -during the months of March, June, September and December. Effluent
sampling for this testing shall be performed at the NPDES permitted final effluent discharge below all treatment
processes.
If the test procedure performed as the first test of any_ single quarter results in a failure or ChV below the
permit limit, then multiple -concentration testing shall be performed at a minimum, in each of the two
following months as described in "North Carolina Phase II Chronic Whole Effluent Toxicity Test
Procedure" (Revised -February 1998) or subsequent versions.
The chronic value for multiple concentration tests will be determined using the geometric mean of the highest `
concentration having no detectable impairment of reproduction or survival and the lowest concentration that does s-
have a detectable impairment of reproduction or survival. The definition of "detectable impairment," collection
methods, exposure regimes, and further statistical methods are specified.in the "North Carolina Phase II Chronic
Whole Effluent Toxicity Test Procedure" (Revised -February 1998) or subsequent versions.
All toxicity testing results required as part of this permit condition will be entered on the Effluent Discharge.
Monitoring Form (MR-1) for the months in which tests were performed, using the parameter code TGP3B for the
pass/fail results and T_HP3B for the Chronic Value. Additionally, DWQ Form AT-3 (original) is to be sent to the
following address:
Attention: North Carolina Division -of Water Quality
Environmental Sciences Section..
1621 Mail Service Center
Raleigh, North Carolina 27699-1621
-Completed Aquatic Toxicity Test Forms shall be filed with the Environmental Sciences Section rio later than 30 daps
after the end of the reporting period for which the report is made.
Test data shall be complete, accurate, include all supporting chemical/physical measurements and all
concentration/response data, and be certified by laboratory supervisor and ORC or approved designate signature.
Total residual chlorine of the effluent toxicity sample must be measured and reported if chlorine is employed for
disinfection of the waste stream.
Should there be no discharge of flow from the facility during a month in which toxicity monitoring is required, the
permittee will complete the information located at the top of the aquatic toxicity (AT) test form indicating the facility
name, permit number, pipe number, county, and the month/year of the report with the notation of "No Flow" in the
comment area of the form. The report shall be submitted to the Environmental Sciences Section at the address cited
above.
Should the permittee fail to monitor during a month in which toxicity monitoring is required, monitoring will be
required during the following month.
Should any test data from this monitoring requirement or tests performed by the North Carolina Division of Water
Quality indicate potential impacts to the receiving stream, this permit may be re -opened and modified to include
alternate monitoring requirements or,limits.
NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum control organism
survival, minimum control organism reproduction, and appropriate environmental controls, shall constitute an invalid
test and will require immediate follow-up testing to be completed no later than the last day of the month following
the month of the -initial -monitoring.

Permit NCO023884
A_ (5) CHRONIC TOXICITY PERMIT LIMIT (QRTRLY) at 20 MGD
The effluent discharge shall at no time exhibit observable inhibition of reproduction or significant mortality to
Ceriodaphnia dubia at an effluent concentration of 4%.
The permit holder shall perform at a minimum, u� a?terly monitoring using test procedures outlined in the "North
Carolina Ceriodaphnia Chronic Effluent Bioassay Procedure," Revised February 1998, or subsequent versions or
"North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure" (Revised -February 1998) or subsequent
versions. The tests will be performed during the months of March, June, September and December: Effluent
sampling for this testing shallbe performed at the NPDES permitted final effluent discharge below all treatment
processes.
If the test procedure performed as the first test of any single quarter results in a failure or ChV below the
permit limit, then multiple -concentration testing shall be performed" at a minimum, in each of the two
following months as described in "North Carolina Phase II Chronic Whole Effluent Toxicity Test _
Procedure" (Revised -February 1998). or subsequent versions.
The chronic value for multiple concentration tests will be determined using the geometric mean of the highest .
concentration having no detectable impairment of reproduction or survival and the lowest concentration that does
."have a detectable impairment of reproduction or survival. The definition -of "detectable impairment," collection
methods, exposure regimes, and further statistical methods are specified in the "North Carolina Phase II Chronic
Whole Effluent Toxicity Test Procedure" (Revised -February 1998) or subsequent versions.
All toxicity testing results required as part of this permit- condition will be entered on the Effluent Discharge
Monitoring Form (MR-1) for the months in which tests were performed, using the parameter -code TGP3B for the
pass/fail results and THP3B for the Chronic Value. Additionally, DWQ Form AT-3 (original) is to be sent to_the following -address:
Attention:. North Carolina Division of Water Quality
Environmental Sciences Section -
1621 Mail -Service Center_
Raleigh, North Carolina 27699-1621
_-Completed Aquatic -Toxicity Test Forms shall be filed with the Environmental Sciences Section no later than 30 days
after the end of the reporting period for which the -report -is made.
--Test data shall be complete, accurate, include all supporting chemical/physical measurements and all
concentration/response data, and be certified by laboratory supervisor and ORC or approved designate signature.'
-Total residual chlorine'of the effluent toxicity sample must be measured and reported if chlorine is employed for
disinfection of the waste stream.
Should there be no discharge of flow from the facility during -a month in which toxicity monitoring is required, the
permittee will complete the information located at the top of the aquatic toxicity (AT) test form indicating the facility
name, permit number, pipe number, county, and the month/year of the report with the notation of "No Flow" in the
comment area of the form. The report shall be submitted to the Environmental Sciences Section at the address, cited
above.
.Should the permittee fail to monitor during a month in which toxicity monitoring is required, -monitoring will be .
required during the following month.
Should any test data from this monitoring requirement or tests performed by the North Carolina Division of Water
Quality indicate potential impacts to the receiving stream, this permit may be re -opened and modified to include
alternate monitoring requirements or limits.
NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum control organism
survival; minimum control organism reproduction, and appropriate environmental controls, shall constitute an invalid
test and will require immediate follow-up testing to be completed no later than the last day of the month following
the month of the initial monitoring.

Permit NCO023884
A. (6) AGGREGATE CALCULATION OF GRANTS CREEK AND TOWN CREEK TSS AND.
BOD REMOVAL EFFICIENCY
TSS wwrp Infl = (TSSGC Innfl x F1owGC) + (TSSTC Infl x F1owTc)
FlowGc + FlowiC
TSS wwTp Effl. _ (TSSGC Effl" x FlowGc) + (TSSTC Effl x Flow rc)
FlowGc + F1owTc
TSSxEMovAL [1 - (TSSwwrp Effl / TSSwwrp Infl)] x 100%
Notes:
"Effl" = Effluent
"Infl" = Influent
Grants Creek Treatment Train
"TC" _,-Town Creek Treatment Train
"WWTP" = Salisbury -Rowan WWTP
A. (7.) DYE STUDY
Upon reaching an average discharge flo* equal to 80% of the design flow of 12.5 MGD (approximately 10 -
MGD), the city of Salisbury will be required to conduct dye studies under low flow and high flow river
conditions to provide information regarding dilution into the Yadkin River (and to confirm the currently
used CORMIX model). The city will submit a study plan to the. Division of Water Quality for review and
approval prior to beginning the dye study. =Guidance fox planning the study can be -obtained from the EPA
or DWQ's Intensive Survey Unit Standard Operating Procedure.-

'
Permit NCO023884
A. (8.) EFFLUENT POLLUTANT SCAN "
The permittee.shall thr perform ee EffluenrPollutant Scans for all parameters listed in the table below (in accordance
with 40 CFR Part_136). The effluent pollutant
scan samples shall represent seasonal (summer, winter, (all, spring)
variations over the 3-year pern-lif cycle.,
Unless otherwise indicated, metals shall be analyzed as "total recoverable.'_
Additionally, the method detection level and the minimum level shall be the most sensitive as provided by the
appropriate analytical procedure.
- Ammonia (as N) -
Trans-1,2-dictiloroethylene .
Bis (2-chloroethyl) ether
_ . Chlorine (total residual, TRC)
� �-1.-JAichloroethylene, .
Bis (2-chloroisopropyl) ether .
u: Dissolved oxygen
1,2-dichloropropane .
Bis (2-ethylhekyl) phthalate
Nitrate/Nitrite
1,3-dichloropropylene
4-bromophenyl phenyl ether
Kjeldahl nitrogen =
Ethylbenzene
= Butyl benzyl phthalate
Oil and grease
Methyl bromide .
27chloronaphthalene
Phosphorus . -
Methyl chloride
4-chlorophenyl phenyl ether
Total dissolved solids
Methylene chloride
Chrysene
Hardness
1,1,2,24etrachloroethane
Dkn butyl phthalate
. Antimony
- Tetrachloroethylene
Di=n-octyl.phthalate - -
Arsenic
- Toluene
Dibenzo(a,h)anthracene '
'. Beryllium
1,1,14dchloroethane
1,2-diichlorobenzene
-;Cadmium
1,1,2-trichloroethane
1,3=dichlorobenzene
Chromium_
Tdchloroethylene
1,4-dichlorobenzene_
- Copper
Vinyl chloride -
3,3-dichlorobenzidine
Lead
__ Acid-extractable:compounds: -Diethyl phthalate
' Mercury
P-chloro-m-cresol
Dimethyl phthalate _
Nickel : '
2-chlorophenol
2,4=dinitrotoluene
Selenium. = _
2;4-dichlorophenol
2,6-dinitrotoluene
Silver
2,4-dimethylphenol
1,2-diphenylhydrazine -
Thallium
4,6-dinitro-o-cresol
Fluoranthene
Zinc -
2,4-dinitrophenol
Fluorene
'Cyanide.
2-nitrophenol
Hexachlorobenzene
- Total phenolic compounds_
4-nitrophenol
Hexachlorobutadiene
Volatile organic compounds::
Pentachlorophenol
Hexachlorocyclo-pentadiene
Acrolein
Phenol '
Hexachloroethane
"Acrylonitrile
2,4,6-tdchlorophenol
--Indeno(1,2,3-cd)pyrene
- Benzene
Base -neutral compounds:
Isophorone
Bromoform. '.
Acenaphthene
Naphthalene
_ Carbon tetrachloride
Acenaphthylene
Nitrobenzene
Chloroberizene
Anthracene
N-nitrosodi-n-propylamine -
Chlorodibromomethane
Benzidine
N-nitrosodimethylamine
Chloroethane
: Benzo(a)anthracene
N-nitrosodiphenylamine
2=chloroethylvinyl ether
Benzo(a)pyrene
Phenanthrene
Chloroform
3A benzofluoranthene
Pyrene
Dichlorobromomethane.
Benzo(ghi)perylene
1,2,4-tdchlorobenzene
1,1-dichloroethane
Benzo(k)fluoranthene
:1,2-dichloroethane
Bis (2-chloroethoxy) methane
Test results shall be,reported to the Division in DWQ Form- DMR-PPA1 or in a form approved by the Director,
within 90 days of sampling. -A copy of the report shall be submitted to Central Files at the following address: .
'. Division of Water Quality,'Surface Water Protection Section, 1617 Mail Service Center, Raleigh, North Carolina
27699-1617.

Facility Name: _
Salisbury —Rowan
WWTP
Receiving Stream:
Yadkin River
Permitted Flow (MGD):
12.5 MGD
Subtiasin:
030704
Facility Class:
IV
Index No.:
Facility Status:
Existing
Stream Class:
W$-V
Permit Status:
Renewal
303(d) Listed:
No
County:
Rowan
Use Support:
Regional Office:
Mooresville
Drainage Area (miz):
3,377
USGS Topo Quad:
E17NW
Summer 7010 (cfs)
735 cfs "
Salisbury, NC
Effective 7010
348 cfs (based on 18.9:1
dilution instream)
Average Flow (cfs):.
4,879
IwC (°io):
5.28
Facility Name:
Salisbury — Rowan
WWTP
Receiving Stream:
Yadkin River
Permitted Flow (MGD):
20.0 MGD
subbasin:
030704
Facility Class:.
IV
Index No.:
Facility Status:
Existing
Stream Class:
W$-V
Permit Status:
Renewal
303(d) Listed:
No
County:
Rowan
Use Support:
Regional Office:
Mooresville
Drainage Area (m12):
3,377
USGS Topo Quad:
E17NW
Summer 7010 (cfs)
735 cfs
Salisbury, NC
Effective 7010
736 cfs (based on 24.8:1
dilution instream)
Average Flow (cfs): 4,879
IwC (0io): 4.04

Corrections "to the Factsheet ,
Per EPA comment the following paragraph should be corrected to include the last sentence:
Salisbury has a full pre-treatment program, with 4 SIUs (Significant Industrial Users)" and 5 CIUs
(Categorical Industrial Users) per its application. DWQ recommends that Salisbury continue to
implement the full pretreatment program and its Long Term Monitoiring Plan through the
renewed permitting cycle.
Correction to the Permit
--A-specialrequiring an annual effluent pollutant scan/priority pollutant analysis for.
the City of Salisbury will be added to the final permit. This is an EPA requirement that must
be fulfilled with the permit renewal application. Per 40 CFR 122.21`
■ 'The IWC for both wasteflows must be modified.. In January 2006, the City of Salisbury ran
an updated CORMIX model. Teresa Rodriguez did .the NPDES review of the CORMIX
model: It is attached as an appendix to the amended factsheet. Major changes included a
revised 7Q10 flow of 735 cfs, which was. determined by ENSR at the requestof the City of
Salisbury. Consultation with USGS indicated that while there is uncertainty determining
7Q10 flows in a lake,. "an estimated. 7Q10 for the Yadkin River between the South Yadkin
River confluence and Grants Creek is a range of 750 —800 cfs. This range of estimates does
not account for any backwater effects_ of High Rock Lake that may exist during low flow -
periods." Although the flow estimate by ENSR is a little lower, NPDES will use the 735 cfs
that ENSR generated and that Salisbury used in its CORMIX model run.
The model run included revised stream flow information and a proposed modification to
close two of the ports -on the existing three -port diffuser. The other variable included the
critical condition now being the lake level of 5 feet below full pool for developing, toxic
limits. Based on the results of the CORMIX model, the instream waste concentrations are
5.3 % at 12.5 MGD and 4% at 20 MGD.
Effective 7Q10 values generated to determine the IWCs are 348 cfs at 12.5 MGD and 736
cfs at 20 MGD. (this is slightly above than the 7Q10 flow of 735 cfs used in the model).
Salisbury Comments on the draft permit
1. Request that limitations/monitoring for selenium is dropped: The 35 ug/1 sample in 2004 is not
representative of the Salisbury effluent and should not be considered in the analysis of effluent data.
All other values are ,below detection. Recommend that it be monitored (quarterly) in the LTMP.
DWQ response: The 35 ug/l.sample in May 2004 was reported in an amended DMR submitted by
Salisbury in November 2004. Due to problems with instruments, metals and other parameters were
not run in time to report on the correct DMR,. The data was reported as part of LTMP. The City
did not report that sample was not representative at the time of its submittal. No information from .
lab that indicated that sample was contaminated.
Recommend that facility have delayed limit for selenium, with 18-month compliance schedule with
monthly monitoring for selenium and limit will become effective eighteen months from effective
date of the permit" If Salisbury submits a minimum of 12 data points and the data does not show
reasonable potential 'to exceed the allowable. concentration then facility can request that DWQ
reevaluate the data to determine if the selenium limit/monitoring in the NPDES permit -will be .
dropped.
Chronic selenium limits of 95 ug/1 and 124. ug/1 were given at 12. 5 MGD. and 20 MGD,
respectively. The acute selenium value is based on selenite (+4) and may not be the most prevalent
form. Therefore, after consultation with EPA, the chronic selenium limit was placed in the permit.
NCO023884 Permit Factsheet
Page 2

2. Request that monitoring for mercury is dropped: The hits (0.4 and 0.3 ug/1) in 2002 are not
representative of the Salisbury. effluent. Recommend that it be monitored quarterly -in the LIMP.
All other values are below detection.
EPA response: An interim objection to the permit (rec'd 2/4/2005) due to RPA showing that Hg
limit should be given but only Hg, monitoring was included. Also questioned that facility should be
using EPA Method 1631 in its analysis:. After discussion of these issues in a January 27 2005
telecon, "EPA recommended that facility have a delayed mercury limit of 0.180 ug/1 with a 18 month
compliance schedule, if collected data shows no RP, then limit/monitoring in the NPDES will be
."_ _dropped.. Need to. address the mercury.samphng method" and resolve
Updated EPA response 12/1/2005 — re-evaluation of Hg data shows, that since the February 2002
hits, all Hg values (35 datapoints) have been below detection of 0.2 ug/l. EPA agrees that mercury
limit may not be needed. EPA will . "concur with quarterly Hg monitoring in the pretreatment .
program Long Term Monitoring Program, however Salisbury must use Method 1631. .
DWQ response: Concurs with Hg monitoring in the LTMP.
Updated DWQ response 01/2006 - with the revised IWCs based on the updated CORMIX
model and "closing two ports on the three port diffuser, the new EPA method for Hg
monitoring is not required for the Salisbury WWTP. IWCs are 5.3 % at 12.5 MGD and 4%.at
20 MGD.
S CONTACT
• DATE:
NCO023884 Permit Factsheet "
Page 3

The City of Salisbury submitted a technical report evaluating the dilution of the existing effluent,"
diffuser and proposed modifications to the diffuser. The first CORIVIIX model to determine the
dilutiori-of the -diffuser was completed in-1995. The -data used in 1995 was different than the data -
presented by Salisbury now. When the model was done in 1995 the design of the diffuser was not final
and it was subsequently modified. The following table presents the data used in 1995 and 2006.
Salisbury estimated new data for stream characteristics including 7Q10_flow and width of the `stream.
Data used by the Division in 1995
Data used by Salisbury in 2005
Stream characteristics:
Stream characteristics:
s7Q101030cfs
29.2 m3/s
s7Q10
735cfs
20.8 m3/s
temp
25°C.
.temp
250C
Full Pool:
Full Pool:
width
490ft
149.4 m
width
335ft _
102A m
channel average depth.
8ft
2.4 m
channel average depth
10ft
3.0 m .
1/3 width
163ft
49.8 m
1/3 width
111.7ft
34.0 m,
5 ft from full pool: "
5 ft from full pool:
width
330ft
.100.E m
width
295ft
89.9 m
channel average depth
4ft
1.2 m
channel average depth
5ft
. 1.5 m
1/3 width
110ft
33.5 m
1/3 width
98.3ft
30.0m
Diffuser:
Diffuser:
Full pool:
Full pool:
distance to left bank
138ft
42.1 m
distance to left bank
140ft
42.7 m
distance to right bank
161 ft
49.1 m
distance to right bank
160ft
48.8 m
5' full pool:
5' full pool:
distance to left bank
140ft
42.7m
distance to left bank
125ft ..
38.1 m
distance to right bank
167ft
50.9 m
distance to right bank
145ft
44.2 m
length
23ft
7.0m
length
20ft
6.1 m
# ports
3-
# ports
3
Port diameter 1.16ft
0.35 m
port diameter
1.16ft
0.35 m
spacing between openings
loft
3.0 m
spacing between openings
10ft
3.0 m
port height
2.5 ft
0.8 m
port height
1 ft
0.3 m .
ngles:angles:
theta
45deg
= theta
Odeg
gamma
90deg
gamma
90deg
beta
90 deg.,
beta
90deg
sigma
0deg
sigma
Odeg
Effluent characteristics:
Effluent characteristics:
flow 12.5 mgd
0.5 m3/s
flow
12.5 mgd
0.5 m3/s
density 1003 k /m3
density
998 k `lm3

1995
2006
Flow
Lake level....
Concentration
Flow
Concentration
MGD
_ -.... - % .-
Dilution
MGD
Lake level
%
Dilution
12.5
full pool
6.83
14.62
12.5.
full pool
- 9.52
10.5
12.5
5' belowfp
6.85.
14.6
12.5
5' .below fp
9.34
10.7
20 ` `
full pool
6.5
15.46.
20
full pool
8.92
11.2
20
5' below fp
9.3
10.73
20
5' below fp
6.80
14.7
Since the concentration in all cases is above 6 % Salisbury wants to modify the diffuser to obtain
concentrations under 6% at the edge of the mixing zone. The mixing zone is established as a plume
width of 1/3 of the channel width. Salisbury investigated two options: reducing the size of the ports to
8" and closing two ports, leaving one 14" port open. In both cases they obtained concentrations under
6 %. Salisbury. chose to close two ports on the existing diffuser. The dilution and waste concentration.
given by the CORMIX model using one 14" port is as follows:
Flow MGD
Lake level
Concentration %
Dilution
12.5
full pool
2.56
39.0
12.5"
5' below full pool
5.28
18.9
20 -
full pool
2.28
43.7
20
5' below full pool
4.04
24.8
Mr. Jeff Jones concluded that the dilution given by CORMIX for 12.5 MGD at 5' below full pool is
not correct. CORMIX produces a prediction file that displays the information on plume properties by ..
modules. Sometimes the program will use a correction factor on the plume width for computation
purposes: A message is displayed in the prediction file explaining the use of this correction factor.
They interpreted this correction factor as a correction to be done, also on the dilution. As the correction
factor is only applied to the plume width it is incorrect to apply it to the pollutant concentration. The
report does say that the dilution values should be acceptable. The pollutant concentration of 5.28 % for
the configuration of one port at 12.5 mgd should be acceptable as given in the CORMIX session
report.

At
Sa/is,64riry�Plwan
August 11, 2006
Ms. Jackie Nowell
Division of Water Quality
NPDES Unit
1617 Mail Service Center
Raleigh, North Carolina 27699 - 1617
RE: Modifications to Salisbury -Rowan WWTP Yadkin River Diffuser
Dear Ms. Nowell:
On May 17, 2006 the City of Salisbury completed modification of the Yadkin River Diffuser as
outlined in the technical report, "Salisbury -Rowan WWTP Yadkin River Diffuser CORMIX
Analysis". Alternative 2 in the report consisted of closing two 14-inch outlets on each diffuser
line with blind flanges, which leaves a single 14-inch outlet on each diffuser line. CORMIX
modeling predicts an Instream Waste Concentration of 5.3% at the regulatory mixing zone
boundary with this modified configuration for a discharger flow of 12.5 MGD.
If you have further questions, please feel free to contact me at [phone] or
i j [e-mail]
Sincerely,
Jeffrey B. Jones, P.E.
Senior Engineer
�D.
j
AUG 1 5 2006
i
DENR - WATER QUALITY
POINT SOURCE BRANCH
1 Water Street Telephone [phone]
Salisbury, NC 28144 Salisbury -Rowan Utilities Fax [phone]

J�'JED srl,s
UNITED STATES ENVIRONMENTAL PROTECTION AGENCY
�m yW REGION 4
o Q A TLANTA FEDERAL CENTER
61 FORSYTH STREET Z�+lq< PROAe to ATLANTA 1GEORGIA 0303-8960
AUG , a zoo
Ms. Jackie Nowell
North Carolina Department of Environment and
Natural Resources
Division of Water Quality
NPDES Unit
1617 Mail Service Center
Raleigh, NC 27699-1617
SUBJ: Draft NPDES Permit
Salisbury -Rowan WWTP - NPDES No. NCO023884
Dear Ms. Nowell:
_
;ILIA
2006
DENR WATER QUALITY
POINT SOURCENCH
In accordance with the EPA/NCDENR MOA, we have completed review of the draft
permit referenced above. Contingent on the permit containing a requirement to conduct a dye
study during both high and low flow conditions during this next permit term, we have no
comments. We request that we be afforded an additional review opportunity only if significant
changes are made to the draft permit prior to issuance, or if significant comments objecting to the
draft permit are received. Otherwise, please send us one copy of the final permit when issued.
Based on the above, EPA's May 3, 2006 interim objection is withdrawn. If you have any
questions, please call me at [phone].
Sincerely,
: V�4�
Marshall Hyatt, Environmental Scientist
Permits, Grants, and Technical Assistance Branch
Water Management Division
Intemet Address (URL) • http://www.epa.gov
Recycled/Recyclable • Primed with Vegetable Oil Based Inks on Recycled Paper (Minimum 30 % Postconsumer)

Dear WNO*q:
River bfuser as,.
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Permit No
Subject: Permit No
From: Jackie Nowell <[e-mail]>
Date: Wed, 09 Aug 2006 11:55:11 -0400
To: Teresa Rodriguez <Teresa. Rodrigu ez@ncmail. net>
CC: Susan Wilson <[e-mail]>
*Just talked to Jeff Jones of Salisbury, they are in agreement to do the dye
studies. They are current averaging about 6.5 MGD and they don't anticipate getting
to 10 MGD during this permit cycle. Here is a draft of the condition that will be
added to the permit. I'm thinking of forwarding it down to Marshall to see if it
says what they need.
*
A. (7.) DYE STUDY*
Upon reaching an average discharge flow equal to 80% of the design flow of 12.5 MGD
(approximately 10 MGD),4he City of Salisbury will be required to conduct dye studies
under low flow and high flow river conditions to provide information regarding
dilution into the Yadkin River
C (4060 7-6 (anl 2 �l C.ccaaZNrL-'( tits OtO (DAAAO
- 4to,2u_ AT- ' ti{ 4(4t(Z!L DES ( g N "Lt-o U1
Content -Type: application/octet-stream
23884 finalpermit2006
Content -Encoding: base64
1 of 1 8/9/2006 12:14 Ply

ice: 6ansnury
Subject: Re: Salisbury
From: [e-mail]
Date: Tue, 01 Aug 2006 14:24:27 -0400
To: Susan Wilson <[e-mail]>
CC: Jackie Nowell <[e-mail]>, Teresa Rodriguez <[e-mail]>
I forwarded your email to Tim and then talked to him. If NC includes a
requirement to conduct a dye study during the term of the permit at a
higher river flow (and maybe a lowflow condition as well), that is
sufficient for us. If you do that, Tim doesn't need to discuss CORMIX
temp and conductivitydensity assumptions.
1 of 1 8/1/2006 2:56 PM

�a uu i vuauw � a a.�
Subject: Draft Permits (12)
From: John Giorgino <[e-mail]>
Date: Mon, 22 May 2006 14:40:18 -0400
To: Jackie Nowell <[e-mail]>
Jackie, I have reviewed the following permits (I am late getting back to you on some
of them, but did not have any comments). Thanks for forwarding them.
NCO025321
N00021962
NCO074705
NCO023884
NC0005177
NC0000361
NC0000400
NCO084620
NCO085839
NC0000353
NC0000175
NCO060534
John Giorgino
Environmental Biologist
North Carolina Division of Water Quality
Environmental Sciences Section
Aquatic Toxicology Unit
Mailing Address:
1621 MSC
Raleigh, NC 27699-1621
Office: 919 733-2136
Fax: [phone]
"The real work of men was hunting meat. The invention of agriculture was a giant step
in the wrong direction, leading to serfdom, cities, and empire. From a race of
hunters, artists, warriors, and tamers of horses, we degraded ourselves to what we are
now: clerks, functionaries, laborers, entertainers, processors of information." -
Edward Abbey
1 nf 1 51990 06 1.0R PM

' 4q16(,
AOL
mom —
Kruger
,qw
Xj
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v
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7'4L

Fw: Yadkin River
Subject: Fw: Yadkin River
From: [e-mail]
Date: Wed, 03 May 2006 13:03:29 -0400
To: [e-mail], [e-mail]
----- Forwarded by Marshall Hyatt/R4/USEPA/US on 05/03/2006 01:02 PM
Tim
Wool/R4/USEPA/US
To
05/03/2006 11:26 Marshall Hyatt/R4/USEPA/US@EPA
AM cc
Subject
Yadkin River
The CORMIX model was developed to look at dilution zones in advectively
driven systems, where water velocity and densities are relatively the
same top to the bottom. The application of CORMIX to the Yadkin River
close to the reservoir does not meet the model assumptions. There needs
to be an analysis conducted to show that the assumptions that are used
to drive the CORMIX application yield results that are close to reality.
A representative dye study or analysis of previously collected water
quality data should be done to prove that CORMIX is an adequate tool for
developing and protecting the mixing zone.
--------------------------------------------------
--------------------------------------------------
Tim Wool
Standards, Monitoring and TMDL Branch
US EPA Region 4
Atlanta, Georgia
404.562.9260
[e-mail]
TMDL Tools:
www.epa.gov/athens/wwqtsc
1 of 1 5/8/2006 10:36 AM

[Fwd: Re: re CORMIX for Salisbury]
Subject: [Fwd: Re: re CORMIX for Salisbury]
From: Jackie Nowell <[e-mail]>
Date: Fri, 28 Apr 2006 15:10:42 -0400
To: Teresa Rodriguez <[e-mail]>
FYI. This is the EPA modeler's concern.
Subject: Re: re CORMIX for Salisbury
From: [e-mail]
Date: Fri, 28 Apr 2006 15:08:30 -0400
To: Jackie Nowell <[e-mail]>
the modeler hasn't told me much and hasn't had a lot of time to look.
But what he has mentioned is because the discharge pipe design is just a
single port, based on the 20 MGD flow, the exit velocity is huge - like
20 m/sec.
Content -Type: message/rfc822
Re: re CORMIX for Salisbury;;
Content -Encoding: 7bit
1 of 1 5/1/2006 10:12 AM

640
635
630
$ 625
W
620
615
610
0
Cross Section 17
(Looking Downstream)
16.72 Mile Upstream Of High Rock Dam
500 1000
1500 2000
Distance (ft)
2500 3000
3500
HAYadkin\Yadkin-Ras\xsec data L-t-R3.xls\Cht17 12/15/2005

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SAD(SEC IS
SALSBURV V KIN DLSCHARGE-CROSSSE=NAL DATA
Sept 13,1993
nxwy
Oct 10,1995
stNa
Distance
depth
llnear if
area
Distance
d
[near 1f
area
from bards
(f0
(
from bard(
to
( f0
(f0
1
4
1.5
9
13.5
1
0
0
5
0
2
14
45.
10
451
2
10
2.75
10
27.5
3
24
7
10
70
3
20
4
10
40
Is
34
9.5
10
95
4
30
515
10
55
5
44
9.5
10
95
5
40
6.25
10
52.5
6
54
9.5
10
95
6
50
5.25
10
52.5
7
64
9.5
10
95
7
60
5
10
50
8
74
9.5
10
95
8
70
4.75
10
47.5
9
84
9.5
10
95
9
80
4.76
10
47.5
10
94
91
10
90
10
90
4.5
10
45
11
104
9
10
901
11
100
4.25
10
42.5
12
114
8.6
10
85
12
110
4.251
10
42.5
13
124
8.5
10
85
13
120
4
10
40
14
134
8
10
80
14
130
4.25
10
42.5
15
144
7.5
10
75
15
140
4.5
10
45
16
154
7.5
10
75
16
150
'4.75
10
47.5
17
164
7
10
70
17
160
4.75
10
47.5
18
174
6,51
10
65
18
170
5
10
50
19
184
61
10
60
19
180
5
10
50
20
194
5.5
10
55
20
190
5
10
50
21
204
5.5
10
55
21
200
5
10
50
22
214
5
10
50
22
210
5
10
50
23
224
4.5
10
45
23
220
5.25
10
52.5
24
234
4
10
40
24
230
5.25
10
52.5
25
244
3.5
10
35
25
240
5.25
10
52.5
26
254
3.5
10
35
26
250
5.5
10
55
27
264
31
10
30
27
260
5.5
10
55
28
274
2.5
10
25
28
270
5.75
10
57.5
29
284
2.5
10
25
29
280
5.75
10
57.5
30
294
2
10
20
30
290
5.75
10
57.5
31
304
2
10
20
31
300
6
10
60
32
314
2
10
20
32
310
6
10
60
33
324
1.5
10
16
33
320
6.25
10
625
34
334
1.5
10
15
34
330
6.25
10
62.5
35
344
1.5
10
15
35
340
6.5
10
65
36
354
1.5
10
15
36
350
6.5
10
65
37
364
1.5
10
15
37
360
6.75
10
67.5
38
374
1.5
10
15
38
370
6.75
10
67.5
S9
384
1.6
10
is
39
380
6.75
10
67.5
40
394
2
10
20
40
390
6.75
10
67.5
41
404
2
10
20
41
400
6.75
10
67.5
42
414
2
10
20
42
410
7
10
70
43
424
2.5
10
25
43
4201
7
10
70
44
434
2.5
10
25
44
430
7.25
10
72.5
45
444
2.5
10
25
45
440
7.5
10
75
46
454
2.5
10
25
46
450
7.75
10
77.5
47
464
2
10
20
47
460
7.75
10
77.5
48
474
0.5
7
3.5
48
470
8
10
80
49
480
8
10
80
4.625
476
2217
50
490
8.25
10
82.5
total
total
51
S00
8.25
10
825
52
510
8.25
10
82.5
53
520
8.5
10
85
54
530
8.75
10
87.5
55
640
9
10
90
56
550
9.25
10
92.5
57
560
9.25
10
92.5
58
570
9
10
90
59
680
8.75
10
87.5
60
590
8.75
10
87.5
61
600
8.75
10
87.5
62
610
8.75
10
87.5
63
620
9
10
90
64
630
9.25
10
92.5
65
640
9.25
10
92.5
66
650
9.25
10
92.5
671
660
9.5
10
95
681
670
9.75
10
97.5
69
680
9.25
10
92.5
70
690
5.75
10
57.5
71
700
0
5
0
=
avg
total
total
Page 1
-R S) r h ST('4,�1
k S( (,I ICVVVh VS70

comments on revised draft permit for NCOO23884 - Salisbury-Rowa...
Subject: comments on revised draft permit for NCOO23884 - Salisbury -Rowan WWTP
From: [e-mail]
Date: Wed, 05 Apr 2006 16:41:29 -0400
To: [e-mail]
CC: [e-mail]
1. Footnote 1 in A.1 is not repeated as Footnote 1 in A.2. Thus, as
drafted, A.6 only applies to the 12.5 MGD discharge and not to the 20
MGD discharge. Is that what you meant? If so, why the difference?
2. In A.6, the title refers to both BOD and TSS, but only TSS % removal
calculations are shown. Shouldn't BOD % removal calculations be -shown?
Or that it indicate BOD % removal should be calculated substituting for
TSS?
3. I was curious to see from the CORMIX modeling that the RWC/IWC was
lower at the higher discharge flow. That is not a typical result. Some
modelers here conferred when I brought this up. They said that is
possible, but that the model assumptions for the difference in temp and
density between the effluent and the lake ought to be checked to ensure
they are realistic. Because not all of that data are included in
Teresa's 2/16/06 memo to you, is that possible to look into? If not,
should some type of instream monitoring to confirm the model results be
conducted when the discharge expands to 20 MGD - possibly a dye study?
1 of 1 4/13/2006 5:00 PM

Salisbury Post
AFFIDAVIT OF PUBLICATION
NC DEPT OF ENVIROMENT--LEGAL & NATURAL RESOURCES
******************************
NORTH CAROLINA
ROWAN COUNTY
Before the undersigned a Notary Public of said County and State, duly
commisioned, qualified, and authorized by law to administer oaths, personally
appeared WINFRED MENTION, who being first duly sworn, deposes and says
that he is ASSISTANT ADVERTISING DIRECTOR of the SALISBURY POST,
published, issued and entered as second class mail in the City of Salisbury, in
said County and State, that he is authorized to make this affidavit and sworn
statement,that the notice or other legal advertisement a true copy of which is
attached hereto, was published in the SALISBURY POST , on the
following dates:
04/02/2006
and that the said newspaper in which such notice, paper documnet or legal
advertisement was published, at the time of each and every such publication,
a newspaper meeting all the requirements and qualifications of Section I-597
of the General Statutes of North Carolina and was a qualified newspaper within
the meaning of Section I-597 of the General Statutes of North Carolina.
NO. 53548 PUBLIC NOTICE
$81.45
41 ^
i *
Sworn and subscribed before me
This loth day of April, 2006
NOTARY PUBLIC
My Commision Expires

` POST PUBLISHING COMPANY
AD INSERTION ORDER
(CONTINUED)
Salesperson: Legals Printed at 04/10/06 14:29
Acct#: 3227
No.53548
PUBLIC NOTICE
State of North Carolina
ENVIRONMENTAL MANAGEMENT
COMMISSION/NPDES UNIT
1617 Mail Service Center, Raleigh, NC 27699-1617
Notification of Intent to Issue a
NPDES Wastewater Permit
On the basis of thorough staff review and application
of NC General Statue 143.21, Public law 92-500 and
other lawful standards and regulations, the North
Carolina Environmental Management Commission
proposes to issue a National Pollutant Discharge
Elimination System (NPDES) wastewater discharge
permit to the person(s) listed below effective 45 days
from the publish date of this notice.
Written comments regarding the proposed permit will
be accepted until 30 days after the publish date of
this notice. All comments received prior to that date
are considered in the final determinations regarding
the proposed permit. The Director of the NC Division
of Water Quality may decide to hold a public meeting
for the proposed permit should the Division receive a
significant degree of public interest.
Copies of the draft permit and other supporting infor-
mation on file used to determine conditions present
in the draft permit are available upon request and
payment of the costs of reproduction. Mail comments
and/or requests for information to the NC Division of
Water Quality at the above address or call the Point
Source Branch at [phone], extension 520 or
363. Please include the NPDES permit number (at-
tached) in any communication. Interested persons
may also visit the Division of Water Quality at 512 N.
Salisbury Street, Raleigh, NC 27604-1148 between
the hours of 8:00 a.m. and 5:00 p.m. to review infor-
mation on file.
NPDES Permit Number NC0023884, City of Salis-
bury (Salisbury -Rowan WWTP) has applied for a
permit renewal for a facility located in Rowan County
discharging treated wastewater into the Yadkin River
in the Yadkin River Basin. Currently BOD5, ammo-
nia, dissolved oxygen, fecal coliform and total residu-
al chlorine are water quality limited. This discharge
may affect future allocations in this portion of the re-
ceiving stream.
Ad#: 46865 Status: E

Sa/isbaryRdw7'1an
Mr. Bob Smet
Environmental & Natural Resources Manager
APGI Yadkin Division
Post Office Box 576
Badin, NC 28009-0576
April 19, 2006
Subject: Notice of Improvements to Salisbury's Diffuser
Dear Bob:
The City of Salisbury provides this notice to APGI Yadkin Division (Alcoa) pursuant to the
provisions of the diffuser easement between Yadkin, Inc. and the City of Salisbury (deed dated
December 4, 1997, and recorded at Rowan County Register of Deeds Book 812 Page 912). This
notice is being provided more than 24 hours in advance of work on the diffuser, consistent with
paragraph (h) of the deed.
Salisbury -Rowan Utilities (SRU) has arranged for the installation of fittings on the diffuser pipes.
We will notify you once a project date has been determined, and the schedule may vary
depending upon weather conditions.
If you have any questions, please feel free to give me a call.
Sincerely,
Matt Bernhardt
Assistant City Manager for Utilities
City of Salisbury
Salisbury -Rowan Utilities
cc: Mr. Dave Goodrich, Division of Water Quality
Mr. David W. Treme, City of Salisbury
Mr. Don Garbrick, J.N. Pease & Associates
Mr. V. Randall Tinsley, Brooks, Pierce, McLendon, Humphrey & Leonard, L.L.P.
file
I Water Street Telephone [phone]
Salisbury, NC 28144 Salisbury -Rowan Utilities Fax [phone]

I
Stpte;'of North Carolina
Dt?pa�irtment of Environment
arf,,' Mtural Resources
Division of Water Quality
Michael F. Easley, Governor
William G. Ross, Jr., Secretary
Alan W. Klimek, P.E., Director
March 29, 2006
MEMORANDUM
To: Britt Setzer
NC DENR / DEH / Regional Engineer
Mooresville Regional Office
From: Jackie Nowell
Point Source Branch
Subject: Review of Draft NPDES Permit NCO023884
Salisbury -Rowan WWTP
Rowan County
16TF.1W,A
IT 0 0
NCDENR
NORTH CAROLINA DEPARTMENT OF
ENVIRONMENT AND NATURAL RESOURCES
MAR r-9.2 0
Public
R 7'.
/C1V d
Please indicate below your agency's position or viewpoint on the draft permit and return this form by April 29, 2006.
If you have any questions on the draft permit, please contact me at the telephone number or e-mail address listed at
the bottom of this page.
�/f ,�/ 6 G s . w/ 010c-e- I ,
RESPONSE: (Check one) 6. +,-— j Ira, 4e - & ft- • , 4L ^ d ; , �t J¢% S e
iie•✓ p res2 - 2C) XW 6 p I✓L. -r f, �a q�ys r llw � ap 1,s,4�
Concur with the issuance of this permit provided the facility is operated and maintained properly, the stated effluent limits
are met prior to discharge, and the discharge does not contravene the designated water quality standards.
F�Concurs with issuance of the above permit, provided the following conditions are met:d M
❑ Opposes the issuance of the above permit, based on reasons stated below, or attached:
0,
1617 Mail Service Center, Raleigh, North Carolina 27699-1617 919 733-5083, extension 363 (fax) 919 733-0719
VISIT US ON THE INTERNET @ http://h2o.enr.state.nc.us/NPDES [e-mail]

Salisbury WWTP at 12.5 MGD * updated effective 7Q10-
Residual Chlorine
7Q10 (CFS)
348
DESIGN FLOW (MGD)
12.5
DESIGN FLOW (CFS)
19.375
STREAM STD (UG/L)
17.0
UPS BACKGROUND. LEVEL (1
0
IWC (%)
5.27
Allowable Concentration (ugj
322.34
Ammonia as NH3
(summer)
7Q10 (CFS)
348
DESIGN FLOW (MGD)
12.5
DESIGN FLOW (CFS)
19.375
STREAM STD (MG/L)
1.0
UPS BACKGROUND LEVEL
0.22
IWC (%)
5.27
Allowable Concentration (m
15.01
Ammonia as NH3
(winter)
7Q10 (CFS) '48
Fecal Limit 2001100ml DESIGN FLOW (MGD)
12.5
Ratio of 18.0 :1 DESIGN FLOW (CFS)
19.375
STREAM STD (MG/L)
1.8
UPS BACKGROUND LEVEL
0.22
IWC (%)
5.27
Allowable Concentration (m 30.18
3/14/2006

Salisbury WWTP at 20.0 MGD * updated effective 7010
Residual Chlorine
Ammonia as NIi3
(summer)
7Q10 (CFS)
736
7010 (CFS)
736
DESIGN FLOW (MGD)
20.
DESIGN FLOW (MGD)
20
DESIGN FLOW (CFS)
31
DESIGN FLOW (CFS)
31
STREAM STD (UG/L)
17.0
STREAM STD (MG/L)
1.0
UPS BACKGROUND LEVEL (1
0
UPS BACKGROUND LEVEL
0.22
IWC (%)
4.04
IWC (%)
4.04
Allowable Concentration (ugj
420.61
Allowable Concentration (m
19.52
Ammonia as NIi3
(winter)
7Q10 (CFS)
Fecal Limit
200/100ml
DESIGN FLOW (MGD)
20
Ratio of 23.7 :1
DESIGN FLOW (CFS)
31
STREAM STD (MG/L)
1.8
UPS BACKGROUND LEVEL
0.22
IWC (%)
8.18
Allowable Concentration (m
19.54
3/14/2006

' REASONABLE POTENTIAL ANALYSIS
Salisbury - Rowan WWTP
NCO023884
Time Period 1/2002-9/2005
Qw (MGD) 12.5
WWTP Class IV
7010S (cfs) 348
IWC (%) @ 7Q10S 5.2739
7Q10W (cfs) 0
@ 7Q10W N/A
30Q2 (cfs) 0
@ 30Q2 N/A
Avg. Stream Flow, QA (cfs) 4879
@ QA 0.3955
Rec'ving Stream Yadkin River
Stream Class WS-V.
Outfal 1001
Qw = 12.5 MGD
STANDARDS &
PARAMETER
TYPE
CRITERIA (2)
POL
Units
REASONABLE POTENTIAL RESULTS
RECOMMENDED ACTION
(1)
NCWQS/
%FAV/
n NDet.
MaxPredCw
AllowableCw
Chronic
Acute
Acute:
N/A
Arsenic
NC
50
ug/L
12 0
9.2
--------------------------------------------
Chronic:
948
No action all values belowadetection
Acute:
15
Cadmium
NC
2
15
ug/L
15 1
5.4
_ _ _
Chronic:
_ _
38
_
No action 14 of 15 values:below detection
Acute:
1,022
Chromium
NC
50
1,022
ug/L
12 4
309.7
_ _
Chronic:
_ _
948
_ _ _
No action no exceedance of allowable conc
Acute:
7
Continue monrtopng reduce to ilmonth due to good tox "
Copper
NC
7
AL 7.3
ug/L
55 11
79.0
_ _
_ _
results
Chronic:
133
k
Acute:
22
Drop quarterly monitoring ;;
Cyanide
NC
5
N 22
10
ug/L
34 1
13.9
_ _
_ _
_ _
Chronic:
95
S
Acute:
34
No action, no exceedance of allowable conc
Lead
NC
25
N 33.8
ug/L
15 2
24.1
_ _
_ _
_
Chronic:
474
Acute:
N/A
Monthly monitoring recommended based on 35°non detects
Mercury
NC
0.012
0.0002
ug/L
43 2
0.7304
be'
since the Feb 2002 hds � OId Hg monitoring me►hod can_
_ _ _
Chronic:
_ _
0.23
used'because'Md<6/ '
Acute:
261
No.•action noezceedance=of allowable conc
Nickel
NC
88
261
ug/L
16 1
11.9
_ _
_ _
_ _
Chronic:
1,669
t
Acute:
56
AddAaily max limit based on chronic`allowable,'due to dilufic
Selenium
NC
5.0
56
ug/L
17 2
273,5
Max-pred exceeds allowable conE_Oelayed limit m 18 mon
_ _
Chronic:
_ _
95
for facilityto hndsource of`Se Will monitor monthly
before delayed limit is',effec6ve. n •
Acute:
1
Continue monitorng reduce to 1/month due Ao,good tox
Silver
NC
0.06
AL 1.23
ug/L
57 3
10.8
_ _
_ _
results _ _ s ;
Chronic:
1
Acute:
67
Continue monitoring e reduce to11 1/month due to, good tox
Zinc
NC
50
AL 67
ug/L
17 13
181.1
_
_
results _ _ _ __
Chronic:
948
�3
Legend. " Freshwater Discharge
C = Carcinogenic
NC = Non -carcinogenic
A =, Aesthetic
23884.rpa12.5mgd.updt012006, rpa
3/14/2006

+ l
REASONABLE POTENTIAL ANALYSIS
Salisbury -Rowan WWTP
NCO023884
Time Period 1/2002-9/2005
Qw (MGD) 20 WWTP Class 1V
7Q 10S (cis) 736 1WC (%) @ 7010S 4.0417
701OW (cfs) , 0 @ 7Q 10W N/A
3002 (cfs) 0 @ 3002 N/A
Avg. Stream Flow, QA (cfs) 4879 @ QA 0.6314
Rec'ving Stream Yadkin River Stream Class WS-V
Outfall 001
Qw = 20 MGD
STANDARDS &
PARAMETER
TYPE
CRITERIA (2)
PQL
Units
REASONABLE POTENTIAL RESULTS
RECOMMENDED ACTION
(1)
NCWQS/ %FAV/
n #Det MaxPredCw
AllawahleCw
Chronic Acute
Acute:
N/A
Arsenic
NC
50
ug/L
12 0
9.2
_ _ _
Chronic:
_ _
1,237
_
No action all values below detell
ction
\t'
Acute:
15
Cadmium
NC
2 15
ug/L
15 1
5.4
------------
Chronic:
49
Nd action 14 of 15 values below deter tion
Acute:
1,022
Chromium
NC
50 1,022
ug/L
12 4
309.7
Chronic:
_ _
1,237
_ _�''
No action no exceedance of allowable, cone
Acute:
7
Contln'ue monitoring retluc'eto 1/month due to good tox:'<
Copper
NC
7 AL 7.3
ug/L
55 11
79.0
_ _
_ _
results _
Chronic:
173
Acute:
22
Drop,quarterlymonitoring ,
Cyanide
- NC
5 N 22
10
ug/L
34 1
13.9
Chronic:
124
_ _
'>
� v
Acute:
34
No action no exceetlance of aflowabl,e cone
Lead
NC
25 N 33.8
ug/L
15 2
24.1
_ _
_ _
Chronic:
619
Acute:
N/A
Monthly monitoring recommended based on 35 non detects
Mercury
NC
0.012
0.0002
ug/L
43 2
0.7304
_ _-_
_
sm_ce the Feb:2g02 hds O�d Hg monitonng;metfiod ca_n be
Chronic:
0.30
used because IWC < 6/ . x' _ r=
YF
Acute:
261
N&action no-exceedance of allowable cone ?'
Nickel
NC
88 261
ug/L
16 1
11.9
_ _
Chronic:
_ _
2,177
_
Acute:
56
Add daily max limit based -on chronic allowable due to dllutic
Selenium
NC
5.0 56
ug/L
17 2
273.5
Max•pred. exceeds allowable conoXelayed,limit in 18>mon
_ _
Chronic:
_ _
124
for facility to findsource'of Se Wilt monifor monthly
before decayed limitis`effectwe . ,
Acute:
1
Contirue monitoring reiiuce to 1/month due to good t , '
Silver
0.06 AL 1:23
ug/L
57 3
10.8
_ _
_ _
a
results ,____Chronic:
kNC
1
Acute:
67
Continue monitoring reduce to-1/month due"to;godtZinc
50 AL 67
ug/L
17 13
181.1
_ _
_ _
results _
Chronic:
1,237
Legend.' " Freshwater Discharge
C = Carcinogenic
NC = Non -carcinogenic
A = Aesthetic
23884.rpa20mgd.updt2012006, rpa
3/14/2006

w
r�
z0 Afw
�-,2e% /8, 9
Y
/ y, 375-
c
INC
i
�17
dY, S
0, 1117rol -/-( . o, o ZSro • 79105 J = / x 3.9
,?-O ,4jcc-e = 3/ Cd
�e3, 7 V -=� ,? Z 8 %
O, d 2f6.7?i0 f = /9, j? , o, Y r6/
7°s = 737 c--4
2,0 A 6,d
e
G, J Z Z 9 -3/
3/t79��1
O, 7UG E? f- d,OLt879 1a = 3�
J,- 30. Z9
7y�,61 " 13Z 8'O`

UJ ZJ?Y c �
31-7.76
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v'!v — f • %y7
w7-11717
0

f V e !iU !c,
3e, -t 7Q�>' 19,3,'cif
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7,jc,,- TEE,,7L

41('00 Z3 gVy
To:
Jackie Nowell
From:
Teresa Rodriguez
Date:
February 16, 2006
Subject:
Review of Salisbury CORMIX analysis
2oo6 rem"/
The City of Salisbury submitted a technical report evaluating the dilution of the existing effluent
diffuser and proposed modifications to the diffuser. The first CORMIX model to determine the
dilution of the diffuser was completed in 1995. The data used in 1995 was different than the data
presented by Salisbury now. When the model was done in 1995 the design of the diffuser was not final
and it was subsequently modified. The following table presents the data used in 1995 and 2006.
Salisbury estimated new data for stream characteristics including'7Q10 flow and width of the stream.
Data used by the Division in 1995
Data used by Salisbury in 2005
Stream characteristics:
Stream characteristics:
s7Q101030 cfs
29.2 m3/s
s7010
735 cfs
20.8 m3/s
temp
25°C
temp
25°C
Full Pool:
Full Pool:
width
490ft
149.4m
width
335ft
102.1 m
channel average depth
8ft
2.4 m
channel average depth
loft
3.0 m
1/3 width
163ft
49.8m
1/3 width
111.7ft
34.0m
ft from full pool:
5 ft from full pool:
�-5
width
330ft
100.E m
width
295ft
89.9 m
channel average depth
4ft
1.2 m
channel average depth
5ft
1.5 m
1/3 width
1 loft
33.5 m
1/3 width
98.3 ft
30.0 m
_
Diffuser:
Diffuser:
Full pool:
Full pool:
distance to left bank
138ft
42.1 m
distance to left bank
140ft
42.7 m
distance to right bank
161 ft
49.1 m
distance to right bank
160ft
48.8 m
-5' full pool:
5' full pool:
distance to left bank
140ft
42.7 m
distance to left bank
125ft
38.1 m
distance to right bank
167ft
50.9m
distance to right bank
145ft
44.2 m
length
23ft
7.0m
length
20ft
6.1 m
# ports
3
# ports
3
Port diameter
1.16ft
0.35m
port diameter
1.16ft
0.35m
spacing between openings
loft
3.0m
spacing between openings
loft
3.0m
port height
2.5ft
0.8 m
port height
1 ft
0.3 m
angles:angles:
theta
45 deg
theta
0 deg
gamma
90 deg
gamma
90 deg
beta
90 deg
beta
90 deg
sigma
0 deg
sigma
0 deg
Effluent characteristics:
Effluent characteristics:
flow
12.5 mgd
0.5 m3/s
flow
12.5 mgd
0.5 m3/s
density1003
k /m3
densit
998 k /m3

The results obtained by the Division in 1995 and results obtained now by Salisbury are shown on the
following table:
1995
2006
Flow
Concentration
Flow
Concentration
MGD
Lake level
%
Dilution
MGD
Lake level
%
Dilution
12.5
full pool
6.83
14.62
12.5
full pool
9.52
10.5
12.5
5' below fp
6.85
14.6
12.5
5' below fp
9.34
10.7
20
full pool
6.5
15.46
20
full pool
8.92
11.2
20
5' below fp
9.3
10.73
20
5' below fp
6.80
14.7
Since the concentration in all cases is above 6 % Salisbury wants to modify the diffuser to obtain
concentrations under 6% at the edge of the mixing zone. The mixing zone is established as a plume
width of 1/3 of the channel .width. Salisbury investigated two options: reducing the size of the ports to
8" and closing two ports, leaving one 14" port open. In both cases they obtained concentrations under
6 %. Salisbury chose to close two ports on the existing diffuser. The dilution and waste concentration
given by the CORMIX model using one 14" port is as follows:
Flow MGD
Lake level
Concentration %
Dilution
12.5
full pool
2.56
39.0
12.5
5' below full pool
5.28
18.9
20
full pool
2.28
43.7
20
5' below full pool
4.04
24.8 11
Mr. Jeff Jones concluded that the dilution given by CORMIX for 12.5 MGD at 5' below full pool is
not correct. CORMIX produces a prediction file that displays the information on plume properties by
modules. Sometimes the program will use a correction factor on the plume width for computation
purposes. A message is displayed in the prediction file explaining the use of this correction factor.
They interpreted this correction factor as a correction to be done also on the dilution. As the correction
factor is only applied to the plume width it is incorrect to apply it to the pollutant concentration. The
report does say that the dilution values should be acceptable. The pollutant concentration of 5.28 % for
the configuration of one port at 12.5 mgd should be acceptable as given in the CORMIX session
report.
i

Salisbury CORMIX Model
Data used in 1995
Stream characteristics:
s7010
1030 cfs
29.2 m3/s
temp
25 °C
Full Pool
width
490 ft
149.4 m
channel average depth
8 ft
2.4 m
1 /3 width
163 ft
49.8 m
-5 ft from full pool
water elevation
330 ft
100.6 m
channel average depth
4 ft
1.2 m
1 /3 width
110 ft
33.5 m
Diffuser:
length
23 ft
7.0 m
# ports
3
port diameter
1.16 ft
0.35 m
spacing between openings
10 ft
3.0 m
angles:
theta
45 deg
gamma
90 deg
beta
90 deg
sigma
0 deg
port height
2.5 ft
0.8 m
full pool:
distance to left bank
138 ft
42.1 m
distance to right bank
161 ft
49.1 m
-5' full pool:
distance to left bank
ft
0.0 m
distance to right bank
ft
0.0 m
Effluent characteristics:
flow
12.5 mgd
0.5 m3/s
density
1003 k /m3
Udld OdIJUUI Y GVVO
Stream characteristics:
s7Q10
735 cfs
20.8 m3/s
temp
25 °C
Full Pool
width
335 ft
102.1 m
channel average depth
10 ft
3.0 m
1 /3 width
111.7 ft
34.0 m
-5 ft from full pool
width
295 ft
89.9 m
channel average depth
5 ft
1.5 m
1 /3 width
98.3 ft
30.0 m
Diffuser:
length
20 ft
6.1 m
# ports
3
port diameter
1.16 ft
0.35 m
spacing between openings
10 ft
3.0 m
angles:
theta
0 deg
gamma
90 deg
beta
90 deg
sigma
0 deg
port height
1 ft
0.3 m
full pool:
distance to left bank
140 ft
42.7 m
distance to right bank
160 ft
48.8 m
-5' full pool:
distance to left bank
125 ft
38.1 m
distance to right bank
145 ft
44.2 m
Effluent characteristics:
flow
12.5 mgd
0.5 m3/s
density
998 k /m3
-ao rn5d 0.2-4 mj/S

?;
Salisbury CORMIX Model
Data used in 1995
Stream characteristics:
s7Q10
1030 cfs
29.2 m3/s
temp
25 °C
Full Pool
width
490 ft
149.4 m
channel average depth
8 ft
2.4 m
1 /3 width
163 ft
49.8 m
-5 ft from full pool
water elevation
330 ft
100.6 m
channel average depth
4 ft
1.2 m
1 /3 width
110 ft
33.5 m
Diffuser:
length
23 ft
7.0 m
# ports
3
port diameter
1.16 ft
0.35 m
spacing between openings
10 ft
3.0 m
angles:
theta
45 deg
gamma
90 deg
beta
90 deg
sigma
0 deg
port height
2.5 ft
0.8 m
distance to left bank
138 ft
42.1 m
distance to right bank
161 ft
49.1 m
Effluent characteristics:
flow
12.5 mgd
0.5 m3/s
temp
°C
Data 2005
Stream characteristics:
s7Q10
833 cfs
23.6 m3/s
temp
25 °C
Full Pool
width
335 ft
102.1 m
channel average depth
10 ft
3.0 m
1 /3 width
102.1 ft
31.1 m
-5 ft from full pool ,
water elevation
ft
0.0 m
channel average depth
ft
0.0 m
1 /3 width
0.0 ft
0.0 m
Diffuser:
length
21.3 ft
6.5 m
# ports
3
port diameter
1.16 ft
0.35 m
spacing between openings
10 ft
3.0 m
angles:
theta
0 deg
gamma
91 deg
beta
90 deg
sigma
0 deg
port height
0.9 ft
0.3 m
distance to left bank
140 ft
42.7 m
distance to right bank
100 ft
30.5 m
Effluent characteristics:
flow
12.5 mgd
0.5 m3/s
temp
°C

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n
i
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Appendix 10
Alternate 2 Configuration
5lIe Por� IMF"
12.5 MGD Effluent Discharge
High Rock Lake Full Pond

Q
CORMIX SESSION REPORT:
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
CORMIX MIXING ZONE EXPERT SYSTEM
CORMIX-GI Version 4.3GT
HYDR01:Version-4.3.0.2 June,2005
SITE NAME/LABEL: SRU Yadkin River Diffuser
DESIGN CASE: Alt 2-12.5 MGD-Full Pond
FILE NAME: C:\Program Files\CORMIX-GI \3\MyFiles\SRU
Diffuser.prd
Using subsystem CORMIXI: Submerged Single Port Discharged
Start of session: 01/16/2006--12:48:38
SUMMARY OF INPUT DATA:
----------------------
AMBIENT PARAMETERS:
Cross-section
= bounded
Width
BS
= 102.11 m
Channel regularity
ICHREG
= 1
Ambient flowrate
QA
= 20.81 m^3/s
Average depth
HA
= 3.05 m ,
Depth at discharge
HD
= 3.05 m.
Ambient velocity
UA
= 0.0669 m/s
Darcy-Weisbach friction factor
F
= 0.0487
Calculated from Manning's n
= 0.03
Wind velocity
UW
= 2 m/s
Stratification Type
STRCND
= U
Surface temperature
= 25
degC
Bottom temperature
= 25 degC
Calculated FRESH -WATER DENSITY
values:
Surface density
Bottom density
----------------------------------
DISCHARGE PARAMETERS:
Nearest bank
Distance to bank
Port diameter
Port cross -sectional area
Discharge velocity
Discharge flowrate
Discharge port height
Vertical discharge angle
Horizontal discharge angle
Discharge density
Density difference
Buoyant acceleration
Discharge concentration
Surface heat exchange coeff
Coefficient of decay
-----------------------------
RHOAS = 997.0456 kg/m^3
RHOAB = 997.0456 kg/m^3
-------------------------------
Submerged Single Port Discharge
= left
DISTB
= 42.67 m
DO
= 0.3557 m
AO
= 0.0994 m^2
UO
= 5.51 m/s-
QO
= 0.547658 m^3/s
HO
= 0.30 m
THETA
= 0 deg
SIGMA
= 0 deg
RH00
= 998 kg/m^3
DRHO
=-0.9544 kg/m^3
GPO
=-0.0094 m/s^2
CO
= 100 %
KS
= 0 m/s
KD
------------------------------------
= 0 /s
DISCHARGE/ENVIRONMENT LENGTH SCALES:
LQ = 0.32 m Lm = 25.98 m Lb = 17.19 m
LM = 31.94 m Lm' = 99999 m Lb' = 99999 m
----------------------------------------------------------------------
NON-DIMENSIONAL PARAMETERS:
Port densimetric Froude number FRO = 95.37
Velocity ratio R = 82.41

a
----------------------------------------------------------------
MIXING ZONE / TOXIC DILUTION ZONE / AREA OF INTEREST PARAMETERS:
Toxic discharge
= no
Water quality standard specified
= no
Regulatory mixing zone
= yes
Regulatory mixing zone specification
= width
Regulatory mixing zone value
= 34.03 m (m^2 if area)_
17•n�
Region of interest
= 2000 m
*****************************************************************************
HYDRODYNAMIC CLASSIFICATION:
*------------------------*
FLOW CLASS = NH5
*------------------------*
This flow Configuration applies to a
layer corresponding to the
full water
depth at the discharge site.
Applicable layer depth = water depth
= 3.05 m
*****************************************************************************
MIXING ZONE EVALUATION (hydrodynamic and
regulatory summary):
-----------------------------------------------------------------------------
X-Y-Z Coordinate system:
Origin is located at the bottom below the port center:
42.67 m from the left bank/shore.
Number of display steps NSTEP = 25 per module.
-----------------------------------------------------------------------------
NEAR-FIELD REGION (NFR) CONDITIONS :
Note: The NFR is the zone of strong initial mixing. It has no regulatory
implication. However, this information may be useful for the discharge
designer because the mixing in the NFR is usually sensitive to the
discharge design conditions.
Pollutant concentration at edge of.NFR = 2.3415 %
Dilution at edge of NFR = 42.7
NFR Location: x = 183.65 m
(centerline coordinates) y = 0 m
z = 0 m
NFR plume dimensions: half -width = 14.90 m
thickness = 3.05 m
Cumulative travel time: 2724.6472 sec.
-----------------------------------------------------------------------------
Buoyancy assessment:
The effluent density is greater than the surrounding ambient water
density at the discharge level.
Therefore, the effluent is NEGATIVELY BUOYANT and will tend to sink towards
the bottom.
-----------------------------------------------------------------------------
Near-field instability behavior:
The discharge flow will experience instabilities with full vertical mixing
in the near -field.
There may be benthic impact of high pollutant concentrations.
-----------------------------------------------------------------------------
FAR-FIELD MIXING SUMMARY:
Plume becomes vertically fully mixed ALREADY IN NEAR -FIELD at 0 m
downstream and continues as vertically mixed into the far -field.
-----------------------------------------------------------------------------
PLUME BANK CONTACT SUMMARY:
Plume in bounded section contacts nearest bank at 0 m downstream.
Plume contacts second bank at 0 m downstream.

************************ TOXIC DILUTION ZONE SUMMARY ************************
No TDZ was specified for this simulation.
********************** REGULATORY MIXING ZONE SUMMARY ***********************
The plume conditions at the boundary of the specified RMZ are as follows:
Pollutant concentration = 2.563877 %
Corresponding dilution = 39.0
Plume location: x = 183.65 m —
(centerline coordinates) y = 42.67 m
z = 0 m
Plume dimensions: half -width = 3.05 m
thickness = 3.05 m
Cumulative travel time < 2724.6472 sec. (RMZ is within NFR)
********************* FINAL DESIGN ADVICE AND COMMENTS **********************
REMINDER: The user must take note that HYDRODYNAMIC MODELING by any known
technique is NOT AN EXACT SCIENCE.
Extensive comparison with field and laboratory data has shown that the
CORMIX predictions on dilutions and concentrations (with associated
plume geometries) are reliable for the majority of cases and are accurate
to within about +-50a (standard deviation).
As a further safeguard, CORMIX will not give predictions whenever it judges
the design configuration as highly complex and uncertain for prediction.

CORMIXI PREDICTION FILE:
11111111111111111111111111111111111111111111111111111111111111111111111111111
CORMIX MIXING ZONE EXPERT SYSTEM
Subsystem CORMIXI: Submerged Single Port Discharges
CORMIX-GI Version 4.3GT
HYDROI Version 4.3.0.2 June 2005
-----------------------------------------------------------------------------
-----------------------------------------------------------------------------
CASE DESCRIPTION
Site name/label: SRU Yadkin River Diffuser
Design case: Alt 2-12.5 MGD-Full Pond
FILE NAME: C:\Program Files\CORMIX-GI 4.3\MyFiles\SRU_Diffuser.prd
Time stamp: Mon Jan 16 12:48:38 2006
ENVIRONMENT PARAMETERS (metric units)
Bounded
section
BS =
102.11
AS = 311.23
QA
= 20.81 ICHREG= 1
HA =
3.05
HD = 3.05
UA =
0.067
F = 0.049
USTAR
=0.5219E-02
UW =
2.000
UWSTAR=0.2198E-02
Uniform
density environment
STRCND=
U
RHOAM = 997.0456
DISCHARGE
PARAMETERS
(metric units)
BANK =
LEFT
DISTB = 42.67
DO =
0.356
AO = 0.099
HO
= 0.30
THETA =
0.00
SIGMA = 0.00
UO =
5.511
QO = 0.548
=0.5477E+00
RHO0 =
998.0000
DRHOO =-.9544E+00
GPO
=-.9387E-02
CO =0.1000E+03
CUNITS= %
IPOLL =
1
KS =0.0000E+00
KD
=0.0000E+00
FLUX VARIABLES (metric units)
QO =0.5477E+00 MO =0.3018E+01 JO =-.5141E-02 SIGNJO= -1.0
Associated length scales (meters)
LQ = 0.32 LM = 31.94 Lm = 25.98 Lb = 17.19
Lmp = 99999.00 Lbp = 99999.00
NON -DIMENSIONAL PARAMETERS
FRO = 95.37 R = 82.41
FLOW CLASSIFICATION
111111111111111111111111111111111111111111
1 Flow class (CORMIXI) = NH5 1
1 Applicable layer depth HS = 3.05 1
111111111111111111111111111111111111111111
MIXING ZONE / TOXIC DILUTION / REGION OF INTEREST PARAMETERS
CO =0.1000E+03 CUNITS= o
NTOX = 0
NSTD = 0
REGMZ = 1
REGSPC= 2 XREG = 0.00 WREG =
XINT = 2000.00 XMAX = 2000.00
X-Y-Z COORDINATE SYSTEM:
34.03 AREG = 0.00

ORIGIN is located at the bottom and below the center of the port:
42.67 m from the LEFT bank/shore.
X-axis points downstream, Y-axis points to left, Z-axis points upward.
NSTEP = 25 display intervals per module
--------------------------------------------------------------------------
--------------------------------------------------------------------------
BEGIN MOD101: DISCHARGE MODULE
COANDA ATTACHMENT immediately following the discharge.
X Y Z S C B
0.00 0.00 0.00 1.0 0.100E+03 0.25
END OF MOD101: DISCHARGE MODULE
-----------------------------------------------------------------------------
-----------------------------------------------------------------------------
BEGIN CORJET (MOD110): JET/PLUME NEAR -FIELD MIXING REGION
Bottom -attached jet motion.
UNSTABLE NEAR -FIELD: Jet/plume will mix over full layer depth.
Following MOD133 will include recirculation into jet region.
Profile definitions:
B = Gaussian 1/e (37%) half -width, normal to trajectory
Half wall jet, attached to bottom.
S = hydrodynamic centerline dilution
C = centerline concentration (includes reaction effects, if any)
X
Y
Z
S
C
B
0.00
0.00
0.00
1.0
0.100E+03
0.18
1.16
0.00
0.00
1.0
0.975E+02
0.31
2.32
0.00
0.00
1.5
0.689E+02
0.43
3.47
0.00
0.00
1.9
0.533E+02
0.55
4.66
0.00
0.00
2.3
0.432E+02
0.68
5.82
0.00
0.00
2.7
0.364E+02
0.80
6.98
0.00
0.00
3.2
0.315E+02
0.92
8.17
0.00
0.00
3.6
0.276E+02
1.04
9.33
0.00
0.00
4.1
0.247E+02
1.16
10.49
0.00
0.00
4.5
0.223E+02
1.28
11.67
0.00
0.00
4.9
0.203E+02
1.40
12.83
0.00
0.00
5.4
0.186E+02
1.51
13.99
0.00
0.00
5.8
0.172E+02
1.63
15.18
0.00
0.00
6.3
0.160E+02
1.74
16.34
0.00
0.00
6.7
0.149E+02
1.86
17.50
0.00
0.00
7.1
0.140E+02
1.97
18.65
0.00
0.00
7.6
0.132E+02
2.08
19.84
0.00
0.00
8.0
0.125E+02
2.19
21.00
0.00
0.00
8.5
0.118E+02
2.30
22.16
0.00
0.00
8.9
0.112E+02
2.41
23.35
0.00
0.00
9.4
0.107E+02
2.52
24.51
0.00
0.00
9.8
0.102E+02
2.63
25.66
0.00
0.00
10.3
0.974E+01
2.73
26.85
0.00
0.00
10.7
0.932E+01
2.84
28.01
0.00
0.00
11.2
0.895E+01
2.95
29.17
0.00
0.00
11.6
0.860E+01
3.05
Cumulative
travel
time =
24.8216 sec

0
END OF CORJET (MOD110): JET/PLUME NEAR -FIELD MIXING REGION
-----------------------------------------------------------------------------
-----------------------------------------------------------------------------
BEGIN MOD133: LAYER BOUNDARY IMPINGEMENT/FULL VERTICAL MIXING
Control volume inflow:
X Y Z S C B
29.17 0.00 0.00 11.6 0.860E+01 3.05
Profile definitions:
BV = layer depth (vertically mixed)
BH = top -hat half -width, in horizontal plane normal to trajectory
ZU = upper plume boundary (Z-coordinate)
ZL = lower plume boundary (Z-coordinate)
S = hydrodynamic average (bulk) dilution
C = average (bulk) concentration (includes reaction effects, if any)
X
Y
Z
S
C
BV
BH
ZU
ZL
26.12
0.00
0.00
11.6
0.860E+01
0.00
0.00
0.00
0.00
26.73
0.00
0.00
11.6
0.860E+01
3.05
0.82
3.05
0.00
27.34
0.00
0.00
11.6
0.860E+01
3.05
1.15
3.05
0.00
27.95
0.00
0.00
11.6
0.860E+01
3.05
1.41
3.05
0.00
28.56
0.00
0.00
11.6
0.860E+01
3.05
1.63
3.05
0.00
29.17
0.00
0.00
11.6
0.860E+01
3.05
1.83
3.05
0.00
29.78
0.00
0.00
12.3
0.812E+01
3.05
2.00
3.05
0.00
30.39
0.00
0.00
13.8
0.724E+01
3.05
2.16
3.05
0.00
31.00
0.00
0.00
15.2
0.659E+01
3.05
2.31
3.05
0.00
31.6L
0.00
0.00
15.9
0.628E+01
3.05
2.45
3.05
0.00
32.22
0.00
0.00
16.3
0.615E+01
3.05
2.58.
3.05
0.00
Cumulative
travel
time =
38.7985 sec
END OF MOD133: LAYER BOUNDARY IMPINGEMENT/FULL VERTICAL MIXING
--------------------------------------------------------------
--------------------------------------------------------------
BEGIN MOD153: VERTICALLY MIXED PLUME IN CO -FLOW
Phase 1: Vertically mixed, Phase 2: Re -stratified
Phase 1: The plume is VERTICALLY FULLY MIXED over the entire layer depth.
Profile definitions:
BV = layer depth (vertically mixed)
BH = Gaussian 1/e (37%) half -width in horizontal plane normal to trajectory
ZU = upper plume boundary (Z-coordinate)
ZL = lower plume boundary (Z-coordinate)
S = hydrodynamic centerline dilution
C = centerline concentration (includes reaction effects, if any)
X
Y
Z
S
C
BV
BH
ZU
ZL
32.22
0.00
0.00
16.3
0.615E+01
3.05
2.52
3.05
0.00
38.27
0.00
0.00
18.1
0.553E+01
3.05
3.08
3.05
0.00
44.33
0.00
0.00
19.7
0.507E+01
3.05
3.63
3.05
0.00
50.39
0.00
0.00
21.3
0.470E+01
3.05
4.17
3.05
0.00
56.45
0.00
0.00
22.7
0.441E+01
3.05
4.71
3.05
0.00
62.50
0.00
0.00
24.0
0.416E+01
3.05
5.24
3.05
0.00
68.56
0.00
0.00
25.3
0.396E+01
3.05
5.76
3.05
0.00
74.62
0.00
0.00
26.5
0.378E+01
3.05
6.28
3.05
0.00
80.67
0.00
0.00
27.6
0.362E+01
3.05
6.79
3.05
0.00

86.73
0.00
0.00
92.79
0.00
0.00
98.85
0.00
0.00
104.90
0.00
0.00
110.96
0.00
0.00
117.02
0.00
0.00
123.08
0.00
0.00
129.13
0.00
0.00
135.19
0.00
0.00
141.25
0.00
0.00
147.30
0.00
0.00
153.36
0.00
0.00
159.42
0.00
0.00
165.48
0.00
0.00
171.53
0.00
0.00
177.59
0.00
0.00
183.65
0.00
0.00
Cumulative
travel time
=
28.7
0.348E+01
3.05
7.30
3.05
0.00
29.8
0.335E+01
3.05
7.80
3.05
0.00
30.8
0.324E+01
3.05
8.30
3.05
0.00
31.8
0.314E+01
3.05
8.79
3.05
0.00
32.8
0.305E+01
3.05
9.28
3.05
0.00
33.7
0.296E+01
3.05
9.77
3.05
0.00
34.6
0.289E+01
3.05
10.25
3.05
0.00
35.5
0.281E+01
3.05
10.73
3.05
0.00
36.4
0.275E+01
3.05
11.20
3.05
0.00
37.2
0.268E+01
3.05
11.67
3.05
0.00
38.1
0.263E+01
3.05
12.14
3.05
0.00
38.9
0.257E+01
3.05
12.61
3.05
0.00
39.7
0.252E+01
3.05
13.07
3.05
0.00
40.5
0.247E+01
3.05
13.53
3.05
0.00
41.2
0.243E+01
3.05
13.99
3.05
0.00
42.0
0.238E+01
3.05
14.44
3.05
0.00
42.7
0.234E+01
3.05
14.90
3.05
0.00
2724.6475 sec
Entire region is occupied by Phase 1.
Plume does not re -stratify in this flow region.
END OF MOD153: VERTICALLY MIXED PLUME IN CO -FLOW
--------------------------------------------------------------------------
** End of NEAR -FIELD REGION (NFR) **
The initial plume WIDTH values in the next far -field module will be
CORRECTED by a factor 3.75 to conserve the mass flux in the far -field!
The correction factor is quite large because of the small ambient velocity
relative to the strong mixing characteristics of the discharge!
This indicates localized RECIRCULATION REGIONS and internal hydraulic JUMPS.
Width predictions show discontinuities, dilution values should be acceptable.
In this design case, the discharge is located CLOSE TO BANK/SHORE.
Some boundary interaction occurs at end of near -field.
This may be related to a design case with a very LOW AMBIENT VELOCITY.
The dilution values in one or more of the preceding zones may be too high.
Carefully evaluate results in near -field and check degree of interaction.
Consider locating outfall further away from bank or shore.
In the next prediction module, the plume centerline will be set
to follow the bank/shore.
The LIMITING DILUTION (given by ambient flow/discharge ratio) is: 39.0
This value is below the computed dilution of 42.7 at the end
of the NFR.
Mixing for this discharge configuration is constrained by LOW AMBIENT FLOW!
The previous module predictions are unreliable since the limiting dilution
cannot be exceeded for this shallow water discharge configuration.
A subsequent module (MOD181) will predict the properties of the
cross -sectionally fully mixed plume with limiting dilution and will
compute a POSSIBLE UPSTREAM WEDGE INTRUSION.
BEGIN MOD181: MIXED PLUME/BOUNDED CHANNEL/POSSIBLE UPSTREAM WEDGE INTRUSION

The DOWNSTREAM flow field for this unstable shallow water discharge is
VERTICALLY FULLY MIXED.
The mixing is controlled by the limiting dilution = 39.0
Channel DENSIMETRIC FROUDE NUMBER (FCHAN) for this mixed flow = 2.47
No upstream wedge intrusion takes place since FCHAN exceeds the critical
value of 0.7.
X Y Z S C BV BH ZU ZL
183.65 42.67 0.00 39.0 0.256E+01 3.05 102.11 3.05 0.00
Cumulative travel time = 2724.6472 sec
VERTICALLY AND LATERALLY FULLY MIXED over layer depth: END OF SIMULATION!
END OF MOD181: MIXED PLUME/BOUNDED CHANNEL/POSSIBLE UPSTREAM WEDGE INTRUSION
-----------------------------------------------------------------------------
** REGULATORY MIXING ZONE BOUNDARY is within the Near -Field Region (NFR) **
In this prediction interval the TOTAL plume width meets or exceeds
the regulatory value = 34.03 m.
This is the extent of the REGULATORY MIXING ZONE.
-----------------------------------------------------------------------------
CORMIXI: Submerged Single Port Discharges End of Prediction File
11111111111111111111111111111111111111111111111111111111111111111111111111111
NFR = 0t

Appendix 11
Alternate 2 Configuration
12.-5 MGD Effluent Discharge
High Rock Lake
5 ft below Full Pond

CORMIX SESSION REPORT:
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
CORMIX MIXING ZONE EXPERT SYSTEM
CORMIX-GI Version 4.3GT
HYDR01:Version-4.3.0.2 June,2005
SITE NAME/LABEL: SRU Yadkin River Diffuser
DESIGN CASE: Alt 2-12.5 MGD-5 ft below Full Pond
FILE NAME: C:\Program Files\CORMIX-GI 4.3\MyFiles\SRU
Diffuser.prd
Using subsystem CORMIXI: Submerged Single Port Discharges
Start of session: 01/16/2006--12:52:17
SUMMARY OF INPUT DATA:
AMBIENT PARAMETERS:
Cross-section
Width
BS
Channel regularity
ICHREG
Ambient flowrate
QA
Average depth
HA
Depth at discharge
HD
Ambient velocity
UA
Darcy-Weisbach friction factor
F
Calculated from Manning's n
Wind velocity
UW
Stratification Type
STRCNC
Surface temperature
degC
Bottom temperature
Calculated FRESH -WATER DENSITY
values:
Surface density
RHOAS
Bottom density
----------------------------------------
RHOAB
DISCHARGE PARAMETERS:
Nearest bank
Distance to bank
Port diameter
Port cross -sectional area
Discharge velocity
Discharge flowrate
Discharge port height
Vertical discharge angle
Horizontal discharge angle
Discharge density
Density difference
Buoyant acceleration
Discharge concentration
Surface heat exchange coeff
Coefficient of decay
-----------------------------
= bounded
= 89.92 m
= 1
20.81 m^3/s
1.52 m-11
1.52 m"
0.1519 m/s
6.0614
0.03
2 m/s
U
25
= 25 degC
= 997.0456 kg/m^3
= 997.0456 kg/m^3
Submerged Single Port Discharge
= left
DISTB
= 38.10 m
DO
= 0.3557 m--
AO
= 0.0994 m^2
UO
= 5.51 m/s
QO
= 0.547658 m^3/s
HO
= 0.30 m -
THETA
= 0 deg
SIGMA
= 0 deg
RHO0
= 998 kg/m^3
DRHO
=-0.9544 kg/m^3
GPO
=-0.0094 m/s^2
CO
= 100 %
KS
= 0 m/s
KD
= 0 / s
DISCHARGE/ENVIRONMENT LENGTH SCALES:
LQ = 0.32 m Lm = 11.44 m
LM = 31.94 m Lm' = 99999 m
NON -DIMENSIONAL PARAMETERS:
Port densimetric Froude number FRO
Velocity ratio R
Lb = 1.47 m
Lb' = 99999 m
----------------
= 95.37
= 36.29

-----------------------------------------------------------------------------
MIXING ZONE / TOXIC DILUTION ZONE / AREA OF INTEREST PARAMETERS:
Toxic discharge = no
Water quality standard specified = no
Regulatory mixing zone = yes
Regulatory mixing zone specification = width I q8
Regulatory mixing zone value = 29.97 m (m^2 if area), --
Region of interest = 2000 m
HYDRODYNAMIC CLASSIFICATION:
------------------------
FLOW CLASS = NH5 I
------------------------
This flow configuration applies to a layer corresponding to the full water
depth at the discharge site.
Applicable layer depth = water depth = 1.52 m
*****************************************************************************
MIXING ZONE EVALUATION (hydrodynamic and regulatory summary):
-----------------------------------------------------------------------------
X-Y-Z Coordinate system:
Origin is located at the bottom below the port center:
38.10 m from the left bank/shore.
Number of display steps NSTEP = 25 per module.
-----------------------------------------------------------------------------
NEAR-FIELD REGION (NFR) CONDITIONS :
Note: The NFR is the zone of strong initial mixing. It has no regulatory
implication. However, this information may be useful for the discharge
designer because the mixing in the NFR is usually sensitive to the
discharge design conditions.
Pollutant concentration at edge of NFR = 5.2882 %
Dilution at edge of NFR = 18.9
NFR Location: x = 71.18 m
(centerline coordinates) y = 0 m
z = 0 m
NFR plume dimensions: half -width = 5.78 m
thickness = 1.52 m
Cumulative travel time: 455.0359 sec.
-----------------------------------------------------------------------------
Buoyancy assessment:
The effluent density is greater than the surrounding ambient water
density at the discharge level.
Therefore, the effluent is NEGATIVELY BUOYANT and will tend to sink towards
the bottom.
-----------------------------------------------------------------------------
Near-field instability behavior:
The discharge flow will experience instabilities with full vertical mixing
in the near -field.
There may be benthic impact of high pollutant concentrations.
-----------------------------------------------------------------------------
FAR-FIELD MIXING SUMMARY:
Plume is vertically fully mixed WITHIN NEAR -FIELD (or a fraction thereof),
but RE -STRATIFIES LATER.
Plume becomes.vertically fully mixed again at 0 m downstream.
-----------------------------------------------------------------------------
PLUME BANK CONTACT SUMMARY:
Plume in bounded section does not contact bank.

************************ TOXIC DILUTION ZONE SUMMARY ************************
No TDZ was specified for this simulation.
********************** REGULATORY MIXING ZONE SUMMARY ***********************
The plume conditions at the boundary of the specified RMZ are as follows:
Pollutant concentration = 5.288208 %
Corresponding dilution=-1_8:9 -
Plume location: x = 71.18 m
(centerline coordinates) y = 0 m
z = 0 m
Plume dimensions: half -width = 1.52_m
thickness = 1.52 m
Cumulative travel time < 455.0359 sec. (RMZ is within NFR)
********************* FINAL DESIGN ADVICE AND COMMENTS **********************
REMINDER: The user must take note that HYDRODYNAMIC MODELING by any known
technique is NOT AN EXACT SCIENCE.
Extensive comparison with field and laboratory data has shown that the
CORMIX predictions on dilutions and concentrations (with associated
plume geometries) are reliable for the majority of cases and are accurate
to within about +-50% (standard deviation).
As a further safeguard, CORMIX will not give predictions whenever it judges
the design configuration as highly complex and uncertain for prediction.

CORMIXI PREDICTION FILE:
11111111111111111111111111111111111111111111111111111111111111111111111111111
CORMIX MIXING ZONE EXPERT SYSTEM
Subsystem CORMIXI: Submerged Single Port Discharges
CORMIX-GI Version 4.3GT
HYDR01 Version 4.3.0.2 June 2005
-----------------------------------------------------------------------------
-----------------------------------------------------------------------------
CASE DESCRIPTION
Site name/label: SRU Yadkin River Diffuser
Design case: Alt 2-12.5 MGD-5 ft below Full Pond
FILE NAME: C:\Program Files\CORMIX-GI 4.3\MyFiles\SRU_Diffuser.prd
Time stamp: Mon Jan 16 12:52:18 2006
ENVIRONMENT PARAMETERS (metric units)
Bounded section
BS = 89.92 AS = 137.03
QA
= 20.81
ICHREG= 1
HA = 1.52 HD = 1.52
UA = 0.152 F = 0.061
USTAR
=0.1330E-01
UW = 2.000 UWSTAR=0.2198E-02
Uniform density environment
STRCND= U RHOAM = 997.0456
DISCHARGE PARAMETERS (metric units)
BANK = LEFT DISTB = 38.10
DO = 0.356 AO = 0.099
HO
= 0.30
THETA = 0.00 SIGMA = 0.00
UO = 5.511 QO = 0.548
=0.5477E+00
RHOO = 998.0000 DRHOO =-.9544E+00
GPO
=-.9387E-02
CO =0.1000E+03 CUNITS= %
IPOLL = 1 KS =0.0000E+00
KD
=0.0000E+00
FLUX VARIABLES (metric units)
QO =0.5477E+00 MO =0.3018E+01
JO
=-.5141E-02
SIGNJO= -1.0
Associated length scales (meters)
l
LQ = 0.32 LM = 31.94
Lm
= 11.44
Lb = 1.47
Lmp
= 99999.00
Lbp = 99999.00
NON -DIMENSIONAL PARAMETERS
FRO = 95.37 R = 36.29
FLOW CLASSIFICATION
1111111111111111111111111111111111.11111111
1 Flow class (CORMIXI) = NH5 1
1 Applicable layer depth HS = 1.52 1
111111111111111111111111111111111111111111
MIXING ZONE / TOXIC DILUTION / REGION OF INTEREST PARAMETERS
CO =0.1000E+03 CUNITS= o
NTOX = 0
NSTD = 0
REGMZ = 1
REGSPC= 2 XREG = 0.00 WREG = 29.97 AREG =
XINT = 2000.00 XMAX = 2000.00
X-Y-Z COORDINATE SYSTEM:
1 11

ORIGIN is located at the bottom and below the center of the port:
38.10 m from the LEFT bank/shore.
X-axis points downstream, Y-axis points to left, Z-axis points upward.
NSTEP­ 25 display intervals per module
-----------------------------------------------------------------------------
-----------------------------------------------------------------------------
BEGIN MOD101: DISCHARGE MODULE
COANDA ATTACHMENT immediately following the discharge.
X Y Z S C B
0.00 0.00 0.00 1.0 0.100E+03 0.25
END OF MOD101: DISCHARGE MODULE
-------------------------------------------------------------
-------------------------------------------------------------
BEGIN CORJET (MOD110): JET/PLUME NEAR -FIELD MIXING REGION
Bottom -attached jet motion.
UNSTABLE NEAR -FIELD: Jet/plume will mix over full layer depth.
Following MOD133 will include recirculation into jet region.
Profile definitions:
B = Gaussian 1/e-(37%) half -width, normal to trajectory
Half wall jet, attached to bottom.
S = hydrodynamic centerline dilution
C = centerline concentration (includes reaction effects, if any)
X
Y
Z
S
C
`✓
0.00
0.00
0.00
1.0
0.100E+03
0.18
0.55
0.00
0.00
1.0
0.100E+03
0.24
1.11
0.00
0.00
1.0
0.994E+02
0.30
1.68
0.00
0.00
1.2
0.824E+02
0.36
2.24
0.00
0.00
1.4
0.704E+02
0.41
2.79
0.00
0.00
1.6
0.616E+02
0.47
.3.35
0.00
0.00
1.8
0.545E+02
0.53
3.92
0.00
0.00
2.0
0.489E+02
0.59
4.48
0.00
0'.00
2.3
0.444E+02
0.64
5.03
0.00
0.00
2.5
0.407E+02
0.70
5.59
0.00
0.00
2.7
0.374E+02
0.75
6.16
0.00
0.00
2.9
0.347E+02
0.81
6.72
0.00
0.00
3.1
0.323E+02
0.86
7.28
0.00
0.00
3.3
0.302E+02
0.91
7.83
0.00
0.00
3.5
0.284E+02
0.97
8.40
0.00
0.00
3.7
0.268E+02
1.02
8.96
0.00
0.00
3.9
0.253E+02
1.07
9.52
0.00
0.00
4.2
0.240E+02
1.12
10.07
0.00
0.00
4.4
0.229E+02
1.17
10.64
0.00
0.00
4.6
0.218E+02
1.23
11.20
0.00
0.00
4.8
0.208E+02
1.28
11.77
0.00
0.00
5.0
0.199E+02
1.33
12.33
0.00
0.00
5.2
0.191E+02
1.38
12.88
0.00
0.00
5.4
0.183E+02
1.43
13.44
0.00
0.00
5.7
0.176E+02
1.48
14.01
0.00
0.00
5.9
0.170E+02
1.52 -
Cumulative
travel
time =
6.3210 sec

END OF CORJET (MOD110): JET/PLUME NEAR -FIELD MIXING REGION
-------------------------------------------------------------------------
-------------------------------------------------------------------------
BEGIN MOD133: LAYER BOUNDARY IMPINGEMENT/FULL VERTICAL MIXING
Control volume inflow:
X Y Z S C B
14.01 0.00 0.00 5.9 0.170E+02 1.52
Profile definitions:
BV = layer depth (vertically mixed)
BH = top -hat half -width, in horizontal plane normal to trajectory
ZU = upper p ume oundary (Z-coordinate)
ZL = lower plume boundary (Z-coordinate)
S = hydrodynamic average (bulk) dilution
C = average (bulk) concentration (includes reaction effects, if any)
X
Y
Z
S
C
BV
QBD
ZU
ZL
12.48
0.00
0.00
5.9
0.170E+02
0.00
0.00
0.00
0.00
12.79
0.00
0.00
5.9
0.170E+02
1.52
0.40
1.52
0.00
13.09
0.00
0.00
5.9
0.170E+02
1.52
0.57
1.52
0.00
13.40
0.00
0.00
5.9
0.170E+02
1.52
0.70
1.52
0.00
13.70
0.00
0.00
5.9
0.170E+02
1.52
0.81
1.52
0.00
14.01
0.00
0.00
5.9
0.170E+02
1.52
0.90
1.52
0.00
14.31
0.00
0.00
6.2
0.161E+02
1.52
0.99
1.52
0.00
14.62
0.00
0.00
7.0
0.143E+02
1.52
1.07
1.52
0.00
14.92
0.00
0.00
7.7
0.130E+02
1.52
1.14
1.52
0.00
15.22
0.00
0.00
8.1
0.124E+02
1.52
1.21
1.52
0.00
15.53
0.00
0.00
8.2
0.121E+02
1.52
1-28
1.52
0.00
Cumulative
travel
time =
9.7727 sec
END OF MOD133: LAYER BOUNDARY IMPINGEMENT/FULL VERTICAL MIXING
-----------------------------------------------------------------------------
-----------------------------------------------------------------------------
BEGIN MOD153: VERTICALLY MIXED PLUME IN CO -FLOW_
Phase 1: Vertically mixed, Phase 2: Re -stratified
Phase 1: The
plume
is VERTICALLY FULLY MIXED
over the
entire layer depth.
Profile definitions:
BV = layer
depth
(vertically
mixed)
BH = Gaussian l/e
(37%) half -width_in hori.z.ont.al-p_laae,-normal
to trajectory
ZU = upper
plume
boundary
(Z-coordinate)
ZL = lower
plume
boundary
(Z-coordinate)
S = hydrodynamic
centerline dilution
C = centerline concentration (includes reaction
effects, if
any)
X
Y
Z
S C
BV
BH
ZU
ZL
15.53
0.00
0.00
8.2 0.121E+02
1.52
1.26
1.52
0.00
17.76
0.00
0.00
8.9 0.112E+02
1.52
1.46
1.52
0.00
19.98
0.00
0.00
9.5 0.105E+02)
1.52
1.66
1.52
0.00
22.21
0.00
0.00
10.1 0.987E+01
1.52
1.86
1.52
0.00
24.43
0.00
0.00
10.7 0.936E+01
1.52
2.05
1.52
0.00
26.66
0.00
0.00
11.2 0.892E+01
1.52
2.24
1.52
0.00
28.89
0.00
0.00
11.7 0.853E+01
1.52
2.43
1.52
0.00
31.11
0.00
0.00
12.2 0.819E+01
1.52
2.62
1.52
0.00
33.34
0.00
0.00
12.7 0.789E+01
1.52
2.81
1.52
0.00

35.57
0.00
0.00
13.1
0.762E+01
1.52
2.99
1.52
0.00
37.79
0.00
0.00
13.6
0.738E+01
1.52
3.18
1.52
0.00
40.02
0.00
0.00
14.0
0.716E+01
1.52
3.36
1.52
0.00
42.24
0.00
0.00
14.4
0.695E+01
1.52
3.54
1.52
0.00
44.47
0.00
0.00
14.8
0.677E+01
1.52
3.72
1.52
0.00
46.70
0.00
0.00
15.2
0.659E+01
1.52
3.90
1.52
0.00
48.92
0.00
0.00
15.5
0.643E+01
1.52
4.07
1.52
0.00
51.15
0.00
0.00
15.9
0.628E+01
1.52
4.25
1.52
0.00
53.38
0.00
0.00
16.3
0.614E+01
1.52
4.42
1.52
0.00
55.60
0.00
0.00
16.6
0.601E+01
1.52
4.60
1.52
0.00
57.83
0.00
0.00
17.0
0.589E+01
1.52
4.77
1.52
0.00
60.05
0.00
0.00
17.3
0.578E+01
1.52
4.94
1.52
0.00
62.28
0.00
0.00
17.6
0.567E+01
1.52
5.11
1.52
0.00
64.51
0.00
0.00
18.0
0.557E+01
1.52
5.28
1.52
0.00
66.73
0.00
0.00
18.3
0.547E+01
1.52
5.45
1.52
0.00
68.96
0.00
0.00
._-18.6
0.538E+01_
1.52
5.62
1.52
0.00
71.18
0.00
0.00
�18.9
0.529E+O1
1.52
5.78-
1.52-
0.00
Cumulative
aveI time
=
455.0360 sec
Entire region is occupied by Phase 1.
Plume does not re -stratify in this flow region.
END OF MOD153: VERTICALLY MIXED PLUME IN CO -FLOW
-----------------------------------------------------------------------------
** End of NEAR -FIELD REGION (NFR) **
The initial plume WIDTH values in the next far -field module will be
CORRECTED by a factor �7 to conserve the mass flux in the far -field!
The correction factor is quite large because of the small ambient velocity
relative to the strong mixing characteristics of the discharge!
This indicates localized RECIRCULATION REGIONS and internal hydraulic JUMPS.
Width predictions show discontinuities, dilution values should be acceptable.
** REGULATORY MG_.ZONE_..8O.UNDARY is within the Near -Field Region (NFR) **
In this prediction interval the TOTAL plume width meets or exceeds
the regulatory value = 29.97 m.
This is the extent of the REGULATORY MIXING ZONE.
-----------------------------------------------------------------------------
BEGIN MOD141: BUOYANT AMBIENT SPREADING
Profile definitions:
BV = top -hat thickness, measured vertically
BH = top -hat half -width, measured horizontally in Y-direction
ZU = upper plume boundary (Z-coordinate)
ZL = lower plume boundary (Z-coordinate)
S = hydrodynamic average (bulk) dilution
C = average (bulk) concentration (includes reaction effects, if any)
Plume Stage 1 (not bank attached):
X
Y
Z
S
C
BV
B14
ZU
ZL
71.18
0.00
0.00
18.9
0.529E+01
1.52
;21.80
1.52
0.00
71.75
0.00
0.00
19.0
0.528E+01
1.52
1.52
0.00
72.32
0.00
0.00
19.0
0.526E+01
1.52
21.91
1.52
0.00
72.89
0.00
0.00
19.0
0.525E+01
1.52
21.96
1.52
0.00
73.46
0.00
0.00
19.1
0.524E+01
1.52
22.02-
1.52
0.00
74.03
0.00
0.00
19.1
0.523E+01
1.52
22.08
1.52
0.00
74.59
0.00
0.00
19.2
0.521E+01
1.52
22.13
1.52
0.00
75.16
0.00
0.00
19.2
0.520E+01
1.52
22.19
1.52
0.00

75.73
0.00
0.00
19.3
0.519E+01
1.52
22.24
1.52
0.00
76.30
0.00
0.00
19.3
0.518E+01
1.52
22.30
1.52
0.00
76.87
0.00
0.00
19.4
0.516E+01
1.52
22.35
1.52
0.00
77.44
0.00
0.00
19.4
0.515E+01
1.52
22.41
1.52
0.00
78.00
0.00
0.00
19.5
0.514E+01
1.52
22.46
1.52
0.00
78.57
0.00
0.00
19.5
0.513E+01
1.52
22.52
1.52
0.00
79.14
0.00
0.00
19.6
0.511E+01
1.52
22.57
1.52
0.00
79.71
0.00
0.00
19.6
0.510E+01
1.52
22.63
1.52
0.00
80.28
0.00
0.00
19.6
0.509E+01
1.52
22.68
1.52
0.00
80.85
0.00
0.00
19.7
0.508E+01
1.52
22.74
1.52
0.00
81.41
0.00
0.00
19.7
0.507E+01
1.52
22.79
1.52
0.00
81.98
0.00
0.00
19.8
0.505E+01
1.52
22.85
1.52
0.00
82.55
0.00
0.00
19.8
0.504E+01
1.52
22.90
1.52
0.00
83.12
0.00
0.00
19.9
0.503E+01
1.52
22.95
1.52
0.00
83.69
0.00
0.00
19.9
0.502E+01
1.52
23.01
1.52
0.00
84.26
0.00
0.00
20.0
0.501E+01
1.52
23.06
1.52
0.00
84.82
0.00
0.00
20.0
0.499E+01
1.52
23.12
1.52
0.00
85.39
0.00
0.00
20.1
0.498E+01
1.52
23.17
1.52
0.00
Cumulative
travel time
=
546.1778 sec
END OF MOD141: BUOYANT AMBIENT SPREADING
-----------------------------------------------------------------------------
-----------------------------------------------------------------------------
BEGIN MOD161: PASSIVE AMBIENT MIXING IN UNIFORM AMBIENT
Vertical diffusivity (initial value) = 0.406E-02 m^2/s
Horizontal diffusivity (initial value) = 0.508E-02 m^2/s
Profile definitions:
BV = Gaussian s.d.*sgrt(pi/2) (46%) thickness, measured vertically
= or equal to layer depth, if fully mixed
BH = Gaussian s.d.*sgrt(pi/2) (46%) half -width,
measured horizontally in Y-direction
ZU = upper plume boundary (Z-coordinate)
ZL = lower plume boundary (Z-coordinate)
S = hydrodynamic centerline dilution
C = centerline concentration (includes reaction effects, if any)
Plume Stage 1
(not
bank attached):
X
Y
Z
S
C
BV
BH
ZU
ZL
85.39
0.00
0.00
20.1
0.498E+01
1.52
23.17
1.52
0.00
161.98
0.00
0.00
20.2
0.494E+01
1.52
23.34
1.52
0.00
238.,56
0.00
0.00
20.4
0.490E+01
1.52
23.51
1.52
0.00
315.15
0.00
0.00
20.5
0.487E+01
1.52
23.67
1.52
0.00
391.73
0.00
0.00
20.7
0.484E+01
1.52
23.84
1.52
0.00
468.31
0.00
0.00
20.8
0.480E+01
1.52
24.00
1.52
0.00
544.90
0.00
0.00
21.0
0.477E+01
1.52
24.16
1.52
0.00
621.48
0.00
0.00
21.1
0.474E+01
1.52
24.3.3
1.52
0.00
698.07
0.00
0.00
21.2
0.471E+01
1.52
24.49
1.52
0.00
774.65
0.00
0.00
21.4
0.468E+01
1.52
24.65
1.52
0.00
851.24
0.00
0.00
21.5
0.465E+01
1.52
24.80
1.52
0.00
927.82
0.00
0.00
21.7
0.462E+01
1.52
24.96
1.52
0.00
1004.40
0.00
0.00
21.8
0.459E+01
1.52
25.12
1.52
0.00
1080.99
0.00
0.00
21.9
0.456E+01
1.52
25.27
1.52
0.00
1157.57
0.00
0.00
22.1
0.453E+01
1.52
25.43
1.52
0.00
1234.16
0.00
0.00
22.2
0.451E+01
1.52
25.58
1.52
0.00
1310.74
0.00
0.00
22.3
0.448E+01
1.52
25.73
1.52
0.00

1387.33
0.00
0.00
22.5
0.445E+01
1.52
25.89
1.52
0.00
1463.91
0.00
0.00
22.6
0.443E+01
1.52
26.04
1.52
0.00
1540.49
0.00
0.00
22.7
0.440E+01
1.52
26.19
1.52
0.00
1617.08
0.00
0.00
22.8
0.438E+01
1.52
26.34
1.52
0.00
1693.66
0.00
0.00
23.0
0.435E+01
1.52
26.49
1.52
0.00
1770.25
0.00
0.00
23.1
0.433E+01
1.52
26.63
1.52
0.00
1846.83
0.00
0.00
23.2
0.430E+01
1.52
26.78
1.52
0.00
1923.42
0.00
0.00
23.4
0.428E+01
1.52
26.93
1.52
0.00
2000.00
0.00
0.00
23.5
0.426E+01
1.52
27.07
1.52
0.00
Cumulative
travel time =
12828.7568
sec
Simulation
limit based on
maximum
specified distance
=
2000.00
m.
This is
the REGION
OF INTEREST
limitation.
END OF MOD161: PASSIVE AMBIENT MIXING IN UNIFORM AMBIENT
-----------------------------------------------------------------------------
--------------------=--------------------------------------------------------
CORMIXI: Submerged Single Port Discharges End of Prediction File
11111111111111111111111111111111111111111111111111.111111111111111111111111111
Z Y"
72 M

Appendix 12
Alternate 2 Configuration
0RA- Pr ICCI
20 MGD Effluent DischarrV17%
ge
High Rock Lake Full Pond

CORMIX SESSION REPORT:
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
CORMIX
MIXING ZONE EXPERT
SYSTEM
CORMIX-GI
Version
4.3GT
HYDRO1:Version-4.3.0.2
June,2005
SITE NAME/LABEL:
SRU Yadkin
River Diffuser
DESIGN CASE:
Alt 2-20 MGD-Full
Pond
FILE NAME:
C:\Program
Files\CORMIX-GI 4.3\MyFiles\SRU
Diffuser.prd
Using subsystem CORMIXI:
Submerged
Single Port Discharges
Start of session:
01/16/2006--12:50:46
SUMMARY OF INPUT DATA:
-----------------------------------------------------------------------------
AMBIENT PARAMETERS:
Cross-section
=
bounded
Width
BS =
102.11 m
Channel regularity
ICHREG =
1
Ambient flowrate
QA =
20.81 m^3/s
Average depth
HA =
3.05 m
Depth at discharge
HD =
3.05 m
Ambient velocity
UA =
0.0669 m/s
Darcy-Weisbach friction factor F =
0.0487
Calculated from Manning's
n =
0.03
Wind velocity
UW =
2 m/s
Stratification Type
STRCND =
U
Surface temperature
=
25
degC
Bottom temperature
=
25 degC
Calculated FRESH -WATER DENSITY values:
Surface density
RHOAS =
997.0456 kg/m^3
Bottom density
RHOAB =
997.0456 kg/m^3
-----------------------------------------------------------------------------
DISCHARGE PARAMETERS:
Submerged
Single Port Discharge
Nearest bank
=
left
Distance to bank
DISTB =
42.67 m
Port diameter
DO =
0.3557 m
Port cross -sectional area
AO =
0.0994 m^2
Discharge velocity
UO =
8.82 m/s
Discharge flowrate
QO =
0.876253 m^3/s
Discharge port height
HO =
0.30 m
Vertical discharge angle
THETA =
0 deg
Horizontal discharge angle
SIGMA =
0 deg
Discharge density
RHO0 =
998 kg/m^3
Density difference
DRHO =
-0.9544 kg/m^3
Buoyant acceleration
GPO =
-0.0094 m/s^2
Discharge concentration
CO =
100 %
Surface heat exchange coeff. KS =
0 m/s
Coefficient of decay
KD =
0 /s
-----------------------------------------------------------------------------
DISCHARGE/ENVIRONMENT LENGTH
SCALES:
LQ = 0.32 m Lm =
41.57 m
Lb='27.50 m
LM = 51.10 m Lm' =
99999 m
Lb' = 99999 m
NON -DIMENSIONAL PARAMETERS:
Port densimetric Froude number FRO =
152.60
Velocity ratio
R =
131.86

-----------------------------------------------------------------------------
MIXING ZONE / TOXIC DILUTION ZONE / AREA OF INTEREST PARAMETERS:
Toxic discharge = no
Water quality standard specified = no
Regulatory mixing zone = yes
Regulatory mixing zone specification = width
Regulatory mixing zone value = 34.03 m (m^2 if area)
Region of interest = 2000 m
*****************************************************************************
HYDRODYNAMIC CLASSIFICATION:
------------------------
FLOW CLASS = NHS
------------------------
This flow configuration applies to a layer corresponding to the full water
depth at the discharge site.
Applicable layer depth = water depth = 3.05 m
*****************************************************************************
MIXING ZONE EVALUATION (hydrodynamic and regulatory summary):
-----------------------------------------------------------------------------
X-Y-Z Coordinate system:
Origin is located at the bottom below the port center:
'42.67 m from the left bank/shore.
Number of display steps NSTEP = 25 per module.
-----------------------------------------------------------------------------
NEAR-FIELD REGION (NFR) CONDITIONS :
Note: The NFR is the zone of strong initial mixing. It has no regulatory
implication. However, this information may be useful for the discharge
designer because the mixing in the NFR is usually sensitive to the
discharge design conditions.
Pollutant concentration at edge of NFR = 1.506 %
Dilution at edge of NFR = 66.4
NFR Location: x = 459.89 m
(centerline coordinates) y = 0 m
z = 0 m
NFR plume dimensions: half -width = 37.88 m
thickness = 3.05 m
Cumulative travel time: 7210.2446 sec.
-----------------------------------------------------------------------------
Buoyancy assessment:
The effluent density is greater than the surrounding ambient water
density at the discharge level.
Therefore, the effluent is NEGATIVELY BUOYANT and will tend to sink towards
the bottom.
-----------------------------------------------------------------------------
Near-field instability behavior:
The discharge flow will experience instabilities with full vertical mixing
in the near -field.
There may be benthic impact of high pollutant concentrations.
-----------------------------------------------------------------------------
FAR-FIELD MIXING SUMMARY:
Plume becomes vertically fully mixed ALREADY IN NEAR -FIELD at 0 m
downstream and continues as vertically mixed into the far -field.
-----------------------------------------------------------------------------
PLUME BANK CONTACT SUMMARY:
Plume in bounded section contacts nearest bank at 0 m downstream.
Plume contacts second bank at 0 m downstream.

************************ TOXIC DILUTION ZONE SUMMARY ************************
No TDZ was specified for this simulation.
********************** REGULATORY MIXING ZONE SUMMARY ***********************
The plume conditions at the boundary of the specified RMZ are as follows:
Pollutant concentration = 2.289918 %
Corresponding dilution = 43.7
Plume location: x = 202.56 m
(centerline coordinates) y = 0 m
z = 0 m
Plume dimensions: half -width = 3.05 m
thickness = 3.05 m
Cumulative travel time < 7210.2446 sec. (RMZ is within NFR)
********************* FINAL DESIGN ADVICE AND COMMENTS **********************
REMINDER: The user must take note that HYDRODYNAMIC MODELING by any known
technique is NOT AN EXACT SCIENCE.
Extensive comparison with field and laboratory data has shown that the
CORMIX predictions on dilutions and concentrations (with associated
plume geometries) are reliable for the majority of cases and are accurate
to within about +-500 (standard deviation).
As a further safeguard, CORMIX will not give predictions whenever it judges
the design configuration as highly complex and uncertain for prediction.

CORMIXI PREDICTION FILE:
11111111111111111111111111111111111111111111111111111111111111111111111111111
CORMIX MIXING ZONE EXPERT SYSTEM
Subsystem CORMIXI: Submerged Single Port Discharges
CORMIX-GI Version 4.3GT
HYDR01 Version 4.3.0.2 June 2005
-----------------------------------------------------------------------------
-----------------------------------------------------------------------------
CASE DESCRIPTION
Site name/label: SRU Yadkin River Diffuser
Design case: ,Alt 2-20 MGD-Full Pond
FILE NAME: C:\Program Files\CORMIX-GI 4.3\MyFiles\SRU_Diffuser.prd
Time stamp: Mon Jan 16 12:50:46 2006
ENVIRONMENT PARAMETERS (metric units)
Bounded
section
BS =
102.11
AS = 311.23
QA
= 20.81 ICHREG= 1
HA =
3.05
HD = 3.05
UA =
0.067
F = 0.049
USTAR
=0.5219E-02
UW =
2.000
UWSTAR=0.2198E-02
Uniform
density environment
STRCND=
U
RHOAM = 997.0456
DISCHARGE
PARAMETERS
(metric units)
BANK =
LEFT
DISTB = 42.67
DO =
0.356
AO = 0.099
HO
= 0.30
THETA =
0.00
SIGMA = 0.00
UO =
8.818
QO = 0.876
=0.8763E+00
RH00 =
998.0000
DRH00 =-.9544E+00
GPO
=-.9387E-02
CO =0.1000E+03
CUNITS= o
IPOLL =
1
KS =0.0000E+00
KD
=0.0000E+00
FLUX VARIABLES (metric units)
QO =0.8763E+00 MO =0.7727E+01
Associated length scales (meters)
LQ = 0.32 LM = 51.10
NON -DIMENSIONAL PARAMETERS
FRO = 152.60 R = 131.86
JO =-.8226E-02 SIGNJO= -1.0
Lm = 41.57 Lb = 27.50
Lmp = 99999.00 Lbp = 99999.00
FLOW CLASSIFICATION
111111111111111111111111111111111111111111
1 Flow class (CORMIXI) = NH5 1
1 Applicable layer depth HS = 3.05 1
111111111111111111111111111111111111111111
MIXING ZONE / TOXIC DILUTION / REGION OF INTEREST PARAMETERS
CO =0.1000E+03 CUNITS= o
NTOX = 0
NSTD = 0
REGMZ = 1
REGSPC= 2 XREG = 0.00 WREG = 34.03 AREG =
XINT = 2000.00 XMAX = 2000.00
X-Y-Z COORDINATE SYSTEM:
1 11

ORIGIN is located at the bottom and below the center of the port:
42.67 m from the LEFT bank/shore.
X-axis points downstream, Y-axis points to left, Z-axis points upward.
NSTEP = 25 display intervals per module
--------------------------------------------------------------------------
--------------------------------------------------------------------------
BEGIN MOD101: DISCHARGE MODULE
COANDA ATTACHMENT immediately following the discharge.
X Y Z S C B
0.00 0.00 0.00 1.0 0.100E+03 0.25
END OF MOD101: DISCHARGE MODULE
----------------------------------------------------------
----------------------------------------------------------
BEGIN CORJET (MOD110): JET/PLUME NEAR -FIELD MIXING REGION
Bottom -attached jet motion.
UNSTABLE NEAR -FIELD: Jet/plume will mix over full layer depth.
Following MOD133 will include recirculation into jet region.
Profile definitions:
B = Gaussian 1/e (370) half -width, normal to trajectory
Half wall jet, attached to bottom.
S = hydrodynamic centerline dilution
C = centerline concentration (includes reaction effects, if any)
X
Y
Z
S
C
B
0.00
0.00
0.00
1.0
0.100E+03
0.18
1.10
0.00
0.00
1.0
0.997E+02
0.30
2.23
0.00
0.00
1.4
0.706E+02
0.42
3.35
0.00
0.00
1.8
0.547E+02
0.54
4.45
0.00
0.00
2.2
0.448E+02
0.66
5.58
0.00
0.00
2.6
0.378E+02
0.78
6.71
0.00
0.00
3.1
0.326E+02
0.90
7.80
0.00
0.00
3.5
0.288E+02
1.02
8.93
0.00
0.00
3.9
0.257E+02
1.14
10.06
0.00
0.00
4.3
0.232E+02
1.25
11.19
0.00
0.00
4.7
0.212E+02
1.37
12.28
0.00
0.00
5.1
0.195E+02
1.48
13.41
0.00
0.00
5.6
0.180E+02
1.60
14.54
0.00
0.00
6.0
0.167E+02
1.72
15.64
0.00
0.00
6.4
0.157E+02
1.83
16.76
0.00
0.00
6.8
0.147E+02
1.94
17.89
0.00
0.00
7.2
0.138E+02
2.06
19.02
0.00
0.00
7.7
0.131E+02
2.17
20.12
0.00
0.00
8.1
0.124E+02
2.28
21.24
0.00
0.00
8.5
0.118E+02
2.39
22.37
0.00
0.00
8.9
0.112E+02
2.50
23.47
0.00
0.00
9.3
0.107E+02
2.61
24.60
0.00
0.00
9.8
0.102E+02
2.72
25.73
0.00
0.00
10.2
07.980E+01
2.83
26.85
0.00
0.00
10.6
0.941E+01
2.94
27.95
0.00
0.00
11.0
0.905E+01
3.05
Cumulative
travel time
=
14.7010 sec

END OF CORJET (MOD110): JET/PLUME NEAR -FIELD MIXING REGION
---------------------------------------------------------------------
---------------------------------------------------------------
BEGIN MOD133 LAYER BOUNDARY IMPINGEMENT/FULL VERTICAL MIXING
Control volume inflow:
X Y Z S C B
27.95 0.00 0.00 11.0 0.905E+01 3.05
Profile definitions:
BV = layer depth (vertically mixed)
BH = top -hat half -width, in horizontal plane normal to trajectory
ZU = upper plume boundary (Z-coordinate)
ZL = lower plume boundary (Z-coordinate)
S = hydrodynamic average (bulk) dilution
C = average (bulk) concentration (includes reaction effects, if any)
X
Y
Z
S
C
BV
BH
ZU
ZL
24.90
0.00
0.00
11.0
0.905E+01
0.00
0.00
0.00
0.00
25.51
0.00
0.00
11.0
0.905E+01
3.05
0.84
3.05
0.00
26.12
0.00
0.00
11.0
0.905E+01
3.05
1.18
3.05
0.00
26.73
0.00
0.00
11.0
0.905E+01
3.05
1.45
3.05
0.00
27.34
0.00
0.00
11.0
0.905E+01
3.05
1.67
3.05
0.00
27.95
0.00
0.00
11.0
0.905E+01
3.05
1.87
3.05
0.00
28.56
0.00
0.00
11.7
0.855E+01
3.05
2.05
3.05
0.00
29.17
0.00
0.00
13.1
0.762E+01
3.05
2.22
3.05
0.00
29.78
0.00
0.00
14.4
0.694E+01
3.05
2.37
3.05
0.00
30.39
0.00
0.00
15.1
0.661E+01
3.05
2.51
3.05
0.00
31.00
0.00
0.00
15.5
0.647E+01
3.05
2.65
3.05
0.00
Cumulative
travel time
=
23.8939 sec
END OF MOD133: LAYER BOUNDARY IMPINGEMENT/FULL VERTICAL MIXING
-----------------------------------------------------------------------------
-----------------------------------------------------------------------------
BEGIN MOD153: VERTICALLY MIXED PLUME IN CO -FLOW
Phase 1: Vertically mixed, Phase 2: Re -stratified
Phase 1: The plume is VERTICALLY FULLY MIXED over the entire layer depth.
Profile definitions:
BV = layer depth (vertically mixed)
BH,= Gaussian 1/e (370) half -width in horizontal plane normal to trajectory
ZU = upper plume boundary (Z-coordinate)
ZL = lower plume boundary (Z-coordinate)
S = hydrodynamic centerline dilution
C = centerline concentration (includes reaction effects, if any)
X
Y
Z
S
C
BV
BH
ZU
ZL
31.00
0.00
0.00
15.5
0.647E+01
3.05
2.51
3.05
0.00
48.15
0.00
0.00
20.1
0.496E+01
3.05
4.17
3.05
0.00
65.31
0.00
0.00
23.9
0.418E+01
3.05
5.79
3.05
0.00
82.47
0.00
0.00
27.2
0.368E+01
3.05
7.38
3.05
0.00
99.62
0.00
0.00
30.1
0.332E+01
3.05
8.94
3.05
0.00
116.78
0.00
0.00
32.8
0.305E+01
3.05
10.47
3.05
0.00
133.93
0.00
0.00
35.2
0.284E+01
3.05
11.98
3.05
0.00
151.09
0.00
0.00
37.5
0.267E+01
3.05
13.46
3.05
0.00
168.24
0.00
0.00.
39.7
0.252E+01
3.05
14.93
3.05
0.00

185.40
0.00
0.00
41.7
0.240E+01
3.05
116.38'
3.05
0.00
** REGULATORY
MIXING ZONE BOUNDARY
is within
the Near, -Field Region (NFR)
**
In this prediction
interval
the TOTAL
plume width
meets or exceeds
the regulatory
value =
34.03
m.
This is the
extent
of the REGULATORY
MIXING ZONE.
202.56
0.00
0.00
43.7
0.229E+01
3.05
17.82
3.05
0.00
219.71
0.00
0.00
45.5
0.220E+01
3.05
19.24
3.05
0.00
236.87
0.00
0.00
47.3
0.211E+01
3.05
20.65
3.05
0.00
254.02
0.00
0.00
49.1
0.204E+01
3.05
22.04
3.05
0.00
271.18
0.00
0.00
50.7
0.197E+01
3.05
23.42
3.05
0.00
288.33
0.00
0.00
52.4
0.191E+01
3.05
24.78
3.05
0.00
305.49
0.00
0.00
53.9
0.185E+01
3.05
26.14
3.05
0.00
322.65
0.00
0.00
55.4
0.180E+01
3.05
27.48
3.05
0.00
339.80
0.00
0.00
56.9
0.176E+01
3.05
28.82
3.05
0.00
356.96
0.00
0.00
58.4
0.171E+01
3.05
30.14
3.05
0.00
374.11
0.00
0.00
59.8
0.167E+01
3.05
31.45
3.05
0.00
391.27
0.00
0.00
61.2
0.163E+01
3.05
32.76
3.05
0.00
408.42
0.00
0.00
62.5
0.160E+01
3.05
34.05
3.05
0.00
425.58
0.00
0.00
63.8
0.157E+01
3.05
35.34
3.05
0.00
442.74
0.00
0.00
65.1
0.154E+01
3.05
36.61
3.05
0.00
459.89
0.00
0.00
66.4
0.151E+01
3.05
37.88
3.05
0.00
Cumulative
travel
time =
7210.2446
sec
Entire region is occupied by Phase 1.
Plume does not re -stratify in this flow region.
END OF MOD153: VERTICALLY MIXED PLUME IN CO -FLOW
** End of NEAR -FIELD REGION (NFR) **
The initial plume WIDTH values in the next far -field module will be
CORRECTED by a factor 3.62 to conserve the mass flux in the far -field!
The correction factor is quite large because of the small ambient velocity
relative to the strong mixing characteristics of the discharge!
This indicates localized RECIRCULATION REGIONS and internal hydraulic JUMPS.
Width predictions show discontinuities, dilution values should be acceptable.
The LIMITING DILUTION (given by ambient flow/discharge ratio) is: 24.8
This value is below the computed dilution of 66.4 at the end
of the NFR.
Mixing for this discharge configuration is constrained by LOW AMBIENT FLOW!
The previous module predictions are unreliable since the limiting dilution
cannot be exceeded for this shallow water discharge configuration.
A subsequent module (MOD181) will predict the properties of the .
cross -sectionally fully mixed plume with limiting dilution and will
compute a POSSIBLE UPSTREAM WEDGE INTRUSION.
---------------------------------------------------------------------------
BEGIN MOD181: MIXED PLUME/BOUNDED CHANNEL/POSSIBLE UPSTREAM WEDGE INTRUSION
The DOWNSTREAM flow field for this unstable shallow water discharge is
VERTICALLY FULLY MIXED.
The mixing is controlled by the limiting dilution = 24.8
Channel DENSIMETRIC FROUDE NUMBER (FCHAN) for this mixed flow = 1.97

No upstream wedge intrusion takes place since FCHAN exceeds the critical
value of 0.7.
X Y Z S C BV BH ZU ZL
459.89 42.67 0.00 24.8 0.404E+01 3.05 102.11 3.05 0.00
Cumulative travel time = 7210.2446 sec
VERTICALLY AND LATERALLY FULLY MIXED over layer depth: END OF SIMULATION!
END OF MOD181: MIXED PLUME/BOUNDED CHANNEL/POSSIBLE UPSTREAM WEDGE INTRUSION
----------------------------------------------------------------------------
CORMIXI: Submerged Single Port Discharges End of Prediction File
11111111111111111111111111111111111111111111111111111111111111111111111111111
Rbqa
_.�
2-Oq m

Appendix'
13
Alternate 2 Configuration
20 MGD Effluent Discharry ge
High Rock Lake
5 ft below Full Pond

CORMIX SESSION REPORT:
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
CORMIX MIXING ZONE EXPERT SYSTEM
CORMIX-GI Version 4.3GT
HYDRO1:Version-4.3.0.2 June,2005
SITE NAME/LABEL: SRU Yadkin River Diffuser
DESIGN CASE: Alt 2-20 MGD-5 ft below Full Pond
FILE NAME: C:\Program Files\CORMIX-GI 4.3\MyFiles\SRU
Diffuser.prd
Using subsystem CORMIXI: Submerged Single Port Discharges
Start of session: 01/16/2006--12:53:43
SUMMARY OF INPUT DATA:
-------------------
AMBIENT PARAMETERS:
Cross-section
= bounded
Width
BS
= 89.92 m
Channel regularity
ICHREG
= 1
Ambient flowrate
QA
= 20.81 m^3/s/
Average depth
HA
= 1.52 m
Depth at discharge
HD
= 1.52 m
Ambient velocity
UA
= 0.1519 m/s
Darcy-Weisbach friction factor
F
= 0.0614
Calculated from Manning's n
= 0.03
Wind velocity
UW
= 2 m/s
Stratification Type
STRCND
= U
Surface temperature
= 25
degC
Bottom temperature
Calculated FRESH -WATER DENSITY values:
Surface density RHOAS
Bottom density RHOAB
----------------------------------------
= 25 degC
= 997.0456 kg/m^3
= 997.0456 kg/m^3
--------------------------
DISCHARGE PARAMETERS:
Submerged
Single Port Discharge
Nearest bank
=
left
Distance to bank
DISTB =
38.10 m
Port diameter
DO =
0.3557 m
Port cross -sectional area
AO =
0.0994 m^2
Discharge velocity
UO =
8.82 m/s
Discharge flowrate
QO =
0.876253 m^3/s
Discharge port height
HO =
0.30 m
Vertical discharge angle
THETA =
0 deg
Horizontal discharge angle
SIGMA =
0 deg
Discharge density
RHO_0 =
998 kg/m^3
Density difference
DRHO =
-0.9544 kg/m^3
Buoyant acceleration
GPO =
-0.0094 m/s^2
Discharge concentration
CO =
100 %
Surface heat exchange coeff. KS =
0 m/s
Coefficient of decay
KD =
0 /s
-----------------------------------------------------------------
DISCHARGE/ENVIRONMENT LENGTH
SCALES:
LQ = 0.32 m Lm =
18.30 m
Lb = 2.35 m
LM = 51.10 m Lm'
= 99999 m
Lb' = 99999 m
-----------------------------------------------------------------
NON-DIMENSIONAL PARAMETERS:
Port densimetric Froude number FRO =
152.60
Velocity ratio
R =
58.06

MIXING ZONE / TOXIC DILUTION ZONE / AREA OF INTEREST PARAMETERS:
Toxic discharge = no
Water quality standard specified = no
Regulatory mixing zone = yes
Regulatory mixing zone specification = width
Regulatory mixing zone value = 29.97 m (m^2 if area)
Region of interest = 2000 m
HYDRODYNAMIC CLASSIFICATION:
*----------------*
FLOW CLASS = NH5
------------------------
This flow configuration applies to a layer corresponding to the full water
depth at the discharge site.
Applicable layer depth = water depth = 1.52 m
*****************************************************************************
MIXING ZONE EVALUATION (hydrodynamic and regulatory summary):
-----------------------------------------------------------------------------
X-Y-Z Coordinate system:
Origin is located at the bottom below the port center:
38.10 m from the left bank/shore.
Number of display steps NSTEP = 25 per module.
-----------------------------------------------------------------------------
NEAR-FIELD REGION (NFR) CONDITIONS :
Note: The NFR is the zone of strong initial mixing. It has no regulatory
implication. However, this information may be useful for the discharge
designer because the mixing in the NFR is usually sensitive to the
discharge design conditions.
Pollutant concentration at edge of NFR = 3.4144 %
Dilution at edge of NFR = 29.3
NFR Location: x = 178.21 m
(centerline coordinates) y = 0 m
z = 0 m
NFR plume dimensions: half -width = 14.69 m
thickness = 1.52 m
Cumulative travel time: 1225.1016 sec.
-----------------------------------------------------------------------------
Buoyancy assessment:
The effluent density is greater than the surrounding ambient water
density at the discharge.level.
Therefore, the effluent is NEGATIVELY BUOYANT and will tend to sink towards
the bottom.
-----------------------------------------------------------------------------
Near-field instability behavior:
The discharge flow will experience instabilities with full vertical mixing
in the near -field.
There may be benthic impact of high pollutant concentrations.
-----------------------------------------------------------------------------
FAR-FIELD MIXING SUMMARY:
Plume becomes vertically fully mixed ALREADY IN NEAR -FIELD at 0 m
downstream and continues as vertically mixed into the far -field.
-----------------------------------------------------------------------------
PLUME BANK CONTACT SUMMARY:
Plume in bounded section contacts nearest bank at 0 m downstream.
Plume contacts second bank at 0 m downstream.

************************ TOXIC DILUTION ZONE SUMMARY ************************
No TDZ was specified for this simulation.
********************** REGULATORY MIXING ZONE SUMMARY ***********************
The plume conditions at the boundary of the specified RMZ are as follows:
Pollutant concentration = 4.040054 %
Corresponding dilution = 24.8
Plume location: x = 178.21 m
(centerline coordinates) y = 38.10 m
z = 0 m
Plume dimensions: half -width = 1.52 m
thickness = 1.52 m
Cumulative travel time < 1225.1016 sec. (RMZ is within NFR)
********************* FINAL DESIGN ADVICE AND COMMENTS **********************
REMINDER: The user must take note that HYDRODYNAMIC MODELING by any known
technique is NOT AN EXACT SCIENCE.
Extensive comparison with field and laboratory data has shown that the
CORMIX predictions on dilutions and concentrations (with associated
plume geometries) are reliable for the majority of cases and are accurate
to within about +-50% (standard deviation).
As a further safeguard, CORMIX will not give predictions whenever it judges
the design configuration as highly complex and uncertain for prediction.

CORMIXI PREDICTION FILE:
11111111111111111111111111111111111111111111111111111111111111111111111111111
CORMIX MIXING ZONE EXPERT SYSTEM
Subsystem CORMIXI: Submerged Single Port Discharges
CORMIX-GI Version 4.3GT
HYDROI Version 4.3.0.2 June 2005
-----------------------------------------------------------------------------
-----------------------------------------------------------------------------
CASE DESCRIPTION
Site name/label
Design case:
FILE NAME:
Time stamp:
SRU Yadkin River Diffuser
Alt 2-20 MGD-5 ft below Full Pond
C:\Program Files\CORMIX-GI 4.3\MyFiles\SRU_Diffuser.prd
Mon Jan 16 12:53:43 2006
ENVIRONMENT PARAMETERS (metric units)
Bounded
section
BS =
89.92
AS = 137.03
QA
= 20.81 ICHREG= 1
HA =
1.52
HD = 1.52
UA =
0.152
F = 0.061
USTAR
=0.1330E-01
UW =
2.000
UWSTAR=0.2198E-02
Uniform
density environment
STRCND=
U
RHOAM = 997.0456
DISCHARGE
PARAMETERS
(metric units)
BANK =
LEFT
DISTB = 38.10
DO =
0.356
AO = 0.099
HO
= 0.30
THETA =
0.00
SIGMA = 0.00
UO =
8.818
QO = 0.876
=0.8763E+00
RHOO =
998.0000
DRHO0 =-.9544E+00
GPO
=-.9387E-02
CO =0.1000E+03
CUNITS= o
IPOLL =
1
KS =0.0000E+00
KD
=0.0000E+00
FLUX VARIABLES (metric units)
QO =0.8763E+00 MO =0.7727E+01 JO
Associated length scales (meters)
LQ = 0.32 LM = 51.10 Lm
Lmp
NON -DIMENSIONAL PARAMETERS
FRO = 152.60 R = 58.06
FLOW CLASSIFICATION
111111111111111111iiiiii111111111111111111
1 Flow class (CORMIXI) = NH5 1
1 Applicable layer depth HS = 1.52 1
111111111111111111111111111111111111111111
=-.8226E-02 SIGNJO= -1.0
18.30 Lb = 2.35
99999.00 Lbp = 99999.00
MIXING ZONE / TOXIC DILUTION / REGION OF INTEREST PARAMETERS
CO =0.1000E+03 CUNITS= o
NTOX = 0
NSTD = 0
REGMZ = 1
REGSPC= 2 XREG = 0.00 WREG =
XINT = 2000.00 XMAX = 2000.00
X-Y-Z COORDINATE SYSTEM:
29.97 AREG = 0.00

ORIGIN is located at the bottom and below the center of the port:
38.10 m from the LEFT bank/shore.
X-axis points downstream, Y-axis points to left, Z-axis points upward.
NSTEP = 25 display intervals per module
-----------------------------------------------------------------------------
-----------------------------------------------------------------------------
BEGIN MOD101: DISCHARGE MODULE
COANDA ATTACHMENT immediately following the discharge.
X Y Z S C B
0.00 0.00 0.00 1.0 0.100E+03 0.25
END OF MOD101: DISCHARGE MODULE
---------------------------------------------------------
BEGIN CORJET (MOD110): JET/PLUME NEAR -FIELD MIXING REGION
Bottom -attached jet motion.
UNSTABLE NEAR -FIELD: Jet/plume will mix over full layer depth.
Following MOD133 will include recirculation into jet region.
Profile definitions:
B = Gaussian 1/e (37%) half -width, normal to trajectory
Half wall jet, attached to bottom.
S = hydrodynamic centerline dilution
C = centerline concentration (includes reaction effects, if any)
X
Y
Z
S
C
B
0.00
0.00
0.00
1.0
0.100E+03
0.18
0.52
0.00
0.00
1.0
0.100E+03
0.24
1.05
0.00
0.00
1.0
0.100E+03
0.29
1.58
0.00
0.00
1.2
0.849E+02
0.35
2.12
0.00
0.00
1.4
0.728E+02
0.41
2.65
0.00
0.00
1.6
0.637E+02
0.46
3.19
0.00
0.00
1.8
0.566E+02
0.52
3.72
0.00
0.00
2.0
0.509E+02
0.57
4.25
0.00
0.00
2.2
0.463E+02
0.63
4.79
0.00
0.00
2.4
0.424E+02
0.68
5.32
0.00
0.00
2.6
0.391E+02
0.74
5.85
0.00
0.00
2.8
0.363E+02
0.79
6.39
0.00
0.00
3.0
0.338E+02
0.85
6.92
0.00
0.00
3.2
0.317E+02
0.90
7.44
0.00
0.00
3.3
0.299E+02
0'.95
7.97
0.00
0.00
3.6
0.282E+02
1.01
8.50
0.00
0.00
3.8
0.267E+02
1.06
9.04
0.00
0.00
4.0
0.253E+02
1.11
9.57
0.00
0.00
4.2
0.241E+02
1.16
10.10
0.00
0.00
4.4
0.230E+02
1.22
10.64
0.00
0.00
4.6
0.219E+02
1.27
11.17
0.00
0.00
4.8
0.210E+02
1.32
11.70
0.00
0.00
5.0
0.202E+02'
1.37
12.24
0.00
0.00
5.2
0.194E+02
1.42
12.77
0.00
0.00
5.4
0.186E+02
1.47
13.30
0.00
0.00
5.6
0.180E+02
1.52
Cumulative
travel time
=
3.7028 sec

END OF CORJET (MOD110): JET/PLUME NEAR -FIELD MIXING REGION
------------------------------------------------------------------
----------------------------------------------------------------
BEGIN MOD133: LAYER BOUNDARY IMPINGEMENT/FULL VERTICAL MIXING
Control volume inflow:
X Y Z S C B
13.30 0.00 0.00 5.6 0.180E+02 1.52
Profile definitions:
BV = layer depth (vertically mixed)
BH = top -hat half -width, in horizontal plane normal to trajectory
ZU = upper plume boundary (Z-coordinate)
ZL = lower plume boundary (Z-coordinate)
S = hydrodynamic average (bulk) dilution
C = average (bulk) concentration (includes reaction effects, if any)
X
Y
Z
S
C
BV
BH
ZU
ZL
11.78
0.00
0.00
5.6
0.180E+02
0.00
0.00
0.00
0.00
12.09
0.00
0.00
5.6
0.180E+02
1.52
0.42
1.52
0.00
12.39
0.00
0.00
5.6
0.180E+02
1.52
0.59
1.52
0.00
12.69
0.00
0.00
5.6
0.180E+02
1.52
0.72
1.52
0.00
13.00
0.00
0.00
5.6
0.180E+02
1.52
0.83
1.52
0.00
13.30
0.00
0.00
5.6
0.180E+02
1.52
0.93
1.52
0.00
13.61
0.00
0.00
5.9
0.170E+02
1.52
1.02
1.52
0.00
13.91
0.00
0.00
6.6
0.151E+02
1.52
1.10
1.52
0.00
14.22
0.00
0.00
7.3
0.138E+02
1.52
1.18
1.52
0.00
14.52
0.00
0.00
7.6
0.131E+02
1.52
1.25
1.52
0.00
14.83
0.00
0.00
7.8
0.128E+02
1.52
1.32
1.52
0.00
Cumulative
travel
time =
5.9833 sec
END OF MOD133: LAYER BOUNDARY IMPINGEMENT/FULL VERTICAL MIXING
---------------------------- 7------------------------------------------------
-----------------------------------------------------------------------------
BEGIN MOD153: VERTICALLY MIXED PLUME IN CO -FLOW
Phase 1: Vertically mixed, Phase 2: Re -stratified
Phase 1: The plume is VERTICALLY FULLY MIXED over the entire layer depth.
Profile definitions:
BV = layer depth (vertically mixed)
BH = Gaussian 1/e (370) half -width in horizontal plane normal to trajectory
ZU = upper plume boundary (Z-coordinate)
ZL = lower plume boundary (Z-coordinate)
S = hydrodynamic centerline dilution
C = centerline concentration (includes reaction effects, if any)
X
Y
Z
S
C
BV
BH
ZU
ZL
14.83
0.00
0.00
7.8
0.128E+02
1.52
1.26
1.52
0.00
21.36
0.00
0.00
9.6
0.104E+02
1.52
1.88
1.52
0.00
27.90
0.00
0.00
11.2
0.896E+01
1.52
2.49
1.52
0.00
34.43
0.00
0.00
12.5
0.800E+01
1.52
3.09
1.52
0.00
40.97
0.00
0.00
13.7
0.729E+01
1•.52
3.68
1.52
0.00
47.51
0.00
0.00
14.8
0.674E+01
1.52
4.26
1.52
0.00
54.04
0.00
0.00
15.9
0.630E+01
1.52
4.84
1.52
0.00
60.58
0.00
0.00
16.8
0.594E+01
1.52
5.40
1.52
0.00
67.11
0.00
0.00
17.8
0.563E+01
1.52
5.96
1.52
0.00

73.65
0.00
0.00
18.6
0.536E+01
1.52
6.51
1.52
0.00
80.18
0.00
0.00
19.5
0.513E+01
1.52
7.06
1.52
0.00
86.72
0.00
0.00
20.3
0.493E+01
1.52
7.60
1.52
0.00
93.25
0.00
0.00
21.1
0.475E+01
1.52
8.13
1.52
0.00
99.79
0.00
0.00
21.8
0.459E+01
1.52
8.66
1.52
0.00
106.32
0.00
0.00
22.5
0.444E+01
1.52
9.18
1.52
0.00
112.86
0.00
0.00
23.2
0.431E+01
1.52
9.70
1.52
0.00
119.39
0.00
0.00
23.9
0.419E+01
1.52
10.22
1.52
0.00
125.93
0.00
0.00
24.6
0.407E+01
1.52
10.73
1.52
0.00
132.47
0.00
0.00
25.2
0.397E+01
1.52
11.24
1.52
0.00
139.00
0.00
0.00
25.8
0.387E+01
1.52
11.74
1.52
0.00
145.54
0.00
0.00
26.4
0.378E+01
1.52
12.24
1.52
0.00
152.07
0.00
0.00
27.0
0.370E+01
1.52
12.74
1.52
0.00
158.61
0.00
0.00
27.6
0.362E+01
1.52
13.23
1.52
0.00
165.14
0.00
0.00
28.2
0.355E+01
1.52
13.72
1.52
0.00
171.68
0.00
0.00
28.7
0.348E+01
1.52
14.21
1.52
0.00
178.21
0.00
0.00
29.3
0.341E+01
1.52
14.69
1.52
0.00
Cumulative
travel
time =
1225.1018 sec
Entire region is occupied by Phase 1.
Plume does not re -stratify in this flow region.
END OF MOD153: VERTICALLY MIXED PLUME IN CO -FLOW
-----------------------------------------------------------------------------
** End of NEAR -FIELD REGION (NFR) **
The initial plume WIDTH values in the next far -field module will be
CORRECTED by a factor 3.62 to conserve the mass flux in the far -field!
The correction factor is quite large because of the small ambient velocity
relative to the strong mixing characteristics of the discharge!
This indicates localized RECIRCULATION REGIONS and internal hydraulic JUMPS.
Width predictions show discontinuities, dilution values should be acceptable.
The LIMITING DILUTION (given by ambient flow/discharge ratio) is: 24.8
This value is below the computed dilution of 29.3 at the end
of the NFR.
Mixing for this discharge configuration is constrained by LOW AMBIENT FLOW!
The previous module predictions are unreliable since the limiting dilution
cannot be exceeded for this shallow water discharge configuration.
A subsequent module (MOD181) will predict the properties of the
cross -sectionally fully mixed plume with limiting dilution and will
compute a POSSIBLE UPSTREAM WEDGE INTRUSION.
---------------------------------------------------------------------------
BEGIN MOD181: MIXED PLUME/BOUNDED CHANNEL/POSSIBLE UPSTREAM WEDGE INTRUSION
The DOWNSTREAM flow field for this unstable shallow water discharge is
VERTICALLY FULLY MIXED.
The mixing is controlled by the limiting dilution = 24.8
Channel DENSIMETRIC FROUDE NUMBER (FCHAN) for this mixed flow = 6.32
No upstream wedge intrusion takes place since FCHAN exceeds the critical
value of 0.7.
X Y Z S C BV BH ZU ZL
178.21 38.10 0.00 24.8 0.404E+01 1.52 89.92 1.52 0.00

Cumulative travel time = 1225.1016 sec
VERTICALLY AND LATERALLY FULLY MIXED over layer depth: END OF SIMULATION!
END OF MOD181: MIXED PLUME/BOUNDED CHANNEL/POSSIBLE UPSTREAM WEDGE INTRUSION
** REGULATORY MIXING ZONE BOUNDARY is within the Near -Field Region (NFR) **
In this prediction interval the TOTAL plume width meets or exceeds
the regulatory value = 29.97 m.
This is the extent of the REGULATORY MIXING ZONE.
-----------------------------------------------------------------------------
CORMIXI: Submerged Single Port Discharges End of Prediction File
11111111111111111111111111111111111111111111111111111111111111111111111111111
f; ;.
Ro

Low -flow characterisOcs'for Yadkin River in vicinity of Salisbury
Subject: Low -flow characteristics for Yadkin River in vicinity of Salisbury
From: John C Weaver <[e-mail]>
Date: Thu, 9 Feb 2006 08:34:23 -0500
To: [e-mail]
CC: John C Weaver <[e-mail]>
Jackie,
In response to your request for a review of recent information and correspondence pertaining to the 7Q10
low -flow discharge for Yadkin River near Salisbury intake and discharge points, the following is provided:
(1) The 7Q10 discharge of 1,030 cfs for Yadkin River at U.S. Highway 29 near Salisbury (station id
02121031, drainage area 3,452 sqmi) is based on the flow characteristics at a discontinued gaging station
Yadkin River near Salisbury (station id 02121000, drainage area 3,450 sqmi), operated 1895-1927.
According to information in our annual data reports, High Rock Lake was put into operation in November
1927, obviously being the cause of the gage's discontinuation. Considering also that W. Kerr Scott
Reservoir did not exist until January 1963, this flow estimate would be reflective of more natural -flow
conditions in the river at that location.
With regard to an updated 7Q10 discharge for the Hwy 29 location (station 02121031), the site is within
the upper end of High Rock Lake, meaning that flow dynamics are affected more by the circulation
patterns of the lake as opposed to the riverine-type dynamics. Therefore, the 7Q10 discharge should not
regarded as a proper measure of low -flow characteristics in this type of setting.
(2) 1 reviewed the memorandum you forwarded from ENSR. The information presented in Table 1 is
consistent with that provided by myself to ENSR in Fall 2003. However, I could not duplicate part of the
information presented in Tables 2 and 3, although the concept described in the memorandum appears to
be consistent with the USGS methods for ungaged sites (that is, pro -rating flow characteristics by
drainage area). That may be due to differences in drainage -area values that we have in our office and
those used by ENSR. For instance, in Table 2, the scaling factor for Yadkin College is listed as 1.03,
compared to 1.08 based on information here at the USGS (2460 sqmi just above S Yadkin confluence /
2280 sqmi at 02116500 Yadkin College gage). The inclusion of drainage -area values at the "point of
prediction" mentioned in the memorandum would help to make further comparisons as needed.
(3) When estimating the low -flow characteristics for locations having large drainage areas, one of the
challenges in applying the method of pro -rated low -flow yields is how much "detail" should be included
when assessing the available upstream gages. For instance, should one just pro -rate using the closest
upstream gage -or- divide the drainage area according to the available streamgages within the basin
before pro -rating low -flow yields. The memorandum indicates that the latter approach was used by ENSR,
regarded by USGS as an acceptable approach.
(4) In April 1993, the USGS estimated low -flow characteristics for Yadkin River near Ellis Crossroads
(station id 0212084025, drainage area 3,370 sqmi), located about 0.75 mile upstream from Grants Creek.
The estimates were based on the low -flow yields at the Yadkin College gage and South Yadkin River near
Mocksville gage (station id 02118000) combined with regional regression relations provided in USGS
Water -Supply Paper 2403 "Low -flow characteristics of streams in North Carolina". The 7Q10 was
estimated at 872 ,cfs, and the low -flow yields applied in this determination are reflective of the period of
records prior to the 1998-2002 drought. Applying updated post -drought 7Q10 low -flow discharges for the
upstream gages while using the same computational approach, the 7Q10 is estimated to be 754 cfs, very
comparable to the 735 cfs estimated by ENSR for the discharge location below the confluence.
1 of 2 2/9/2006 9:13 AM

Low -flow characteristics for Yadkin River in vicinity of Salisbury
(5) Two other approaches that involves pro -rating the South Yadkin basin on the basis of the Mocksville
gage and Hunting Creek near Harmony (station id 02128500, drainage area 155 sgmi) result in 7Q10
estimates ranging from 780 to 791 cfs.
(6) As previously discussed, no information is, -immediately available to determine how far upstream the
headwaters of High Rock Lake extend up the Yadkin River and possibly the South Yadkin River.
Examination of USGS topographic data using mapping software suggest that some backwater influence
at normal lake levels may exist at the confluence. However, it is plausible to consider that, during 7Q10
flow conditions during extended dry periods, the lake levels would likely be lower as well, meaning the
reach of Yadkin River between the confluence and Grants Creek may not be in the backwater of the lake.
In summary, it appears the most appropriate determination of a reasonable and updated 7Q10 for the
Yadkin River between the South Yadkin River confluence and Grants Creek is a range from 750 to 800
cfs. This range of estimates does not account for any backwater effects of High Rock Lake that may exist
during low -flow periods.
Hope this information is helpful. Please feel free to contact me if you have questions or need further
discussion.
Thank you.
Curtis Weaver
***********************************************************************
J. Curtis Weaver, Hydrologist, PE
USGS North Carolina Water Science Center
3916 Sunset Ridge Road
Raleigh, NC 27607
Telephone: [phone] H Fax: [phone]
E-mail address -- [e-mail]
Internet address -- http://nc.water.usgs.gov/
2 of 2 2/9/2006 9:13 AM

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TECHNICAL REPORT
Salisbury -Rowan WWTP Yadkin River Diffuser
CORMIX Analysis
January 2006
Background
In order to assign an in -stream waste concentration (IWC) used in the NPDES permit for
Salisbury -Rowan WWTP, NCDENR uses CORMIX to establish a dilution factor. Based on
recent CORMIX analysis, there is strong evidence that the existing Yadkin River Diffuser
(Diffuser) is designed for flows much greater than those included in Salisbury -Rowan WWTP
NPDES Permit. This technical report is directed at evaluating modifications to the Diffuser that
improve effluent mixing based on CORMIX modeling.
Data and Methodology
The CORMIX model uses input data and parameters classified into four categories: Stream
Characteristics, Effluent Characteristics, Diffuser Characteristics and Regulatory Mixing Zone.
Stream Characteristics: The Yadkin River at the Diffuser was modeled as having a uniform,
bounded cross-section with steady, unidirectional flow of 735 cubic feet per second (cfs).
Attached in Appendix 1 is a 2003 report prepared by ENSR to evaluate low flow conditions on
the Yadkin River at Salisbury's Water Intake and at the Diffuser. Default values were used for
Manning N, wind velocity and water temperature. NCDENR requested Salisbury -Rowan
Utilities (SRU) to evaluate stream characteristics based on conditions with High Rock Lake at
full pond (623.9 feet NGVD 29) and with High Rock Lake 5 feet below full pond. From 1997
Alcoa Bathymetry and Diffuser record drawings, the average bottom elevation is approximately
614 feet. This gives an average water depth of 10 feet at High Rock Lake full pond and average
water depth of 5 feet at High Rock Lake 5 feet below full pond. Using 2003 aerial photography,
the cross-section width was measured to be 335 feet at full pond and 295 feet at 5 feet below full
pond. The stream characteristic inputs are summarized in Table I below:
Table 1 Stream Characteristics
Flow Rate (cfs)
Manning
Wind Velocity (m/s)
Water Temp (°C)
Depth (ft)
Width (ft)
Bounded Cross-Section/Uniform
Steady Flow Rate
735
0.03
2
25
10
5
335
295

Effluent Characteristics: Salisbury -Rowan WWTP's NPDES permit has two discharge limits,
12.5 million gallons per day (mgd) and 20 mgd. Laboratory analysis documents the effluent
density to be 998 kg/m3. The effluent is not diluted before discharge to ,the Yadkin River,
therefore a discharge concentration of 100% was used. The effluent characteristic inputs are
summarized in Table 2 below.
Table 2 Effluent Characteristics
Flow Rate (mgd)
Density (kg/m3)
Concentration (%)
12.5
20
998
998
100
100
Diffuser Characteristics: The Diffuser record drawings were used to complete the diffuser
characteristic inputs. The nearest bank is to the left looking downstream. The port height is
approximately 1 foot above the sand bottom. The closest port to the left bank is 140 feet at full
pond and 125 feet at 5 feet below full pond. The diffuser is configured with three 14-inch ports
with separation of 10 feet on -center for a diffuser length of 20 feet. The farthest port from the
left bank is 160 feet at full pond and 145 feet at 5 feet below full pond. The diffuser pipe is
cross -current for a gamma angle of 90°. Each port has one nozzle that is pointed horizontally
downstream (theta is 0°, sigma is 0°) and is oriented at 90' relative to the diffuser pipe (beta).
To improve effluent mixing, the diffuser modifications considered were (1) the replacement of
the three 14" ports with three 8" ports and (2) cap two ports to leave a single 14" port. The
diffuser characteristic inputs are summarized in Table 3 below.
Table 3 Diffuser Characteristics
Nearest Bank
Port Height (ft)
Nearest Endpoint (ft)
Type
Length (ft)
Farthest Endpoint (ft)
Port Diameter (ft)
(in)
Number of Ports
Nozzles per Port
Gamma (deg)
Theta (deg)
Sigma (deg)
Beta (deg)
Left
1
140
125
Multi
Multi
Single
Multi
Multi
Single
20
20
-
20
20
-
160
160
-
145
145
-
1.167
(14)
0.667
(8)
1.167
(14)
1.167
(14)
0.667
(8)
1.167
(14)
3
3
1
3
3
1
1
1
-
1
1
-
90
90
-
90
90
-
0
0
0
0
0
0
0
0
0
0
0
0
90
90
-
90
90
-
Regulatory Mixing Zone: Based on review of previous CORMIX models for the Diffuser and
discussions with NCDENR, it was agreed that the appropriate measure for the regulatory mixing
zone is a plume width to channel width ratio of 1/3.
Page 2 of 4

Results and Conclusions
A total of 12 CORMIX models were run to cover the combinations of water level, effluent
discharge and diffuser configuration. When evaluating the regulatory mixing zone based on
plume to channel width, the plume widths reported in the session reports were incorrect giving
inaccurate pollutant concentrations; therefore the regulatory mixing zone reported in the
prediction files were used for the summary tables below.
Current Diffuser Configuration: A series of four models were executed using the current
diffuser configuration (three 14" ports) to cover flows of 12.5 mgd and 20 mgd and water levels
of High Rock Lake full pond and High Rock Lake 5 feet below full pond. The session reports
and prediction files are included in Appendices 2-5 and are summarized in Table 4 below.
Table 4
Pollutant Concentration (%)
Dilution Factor
Discharge Velocity (m/s)
12.5 mgd 12.5 mgd 20 MGD 20 MGD
Full Pond 5 ft below FP Full Pond 5 ft below FP
8.4
9.6
6.4
6.8
11.9
10.4
15.7
14.7
1.84
1.84
2.94
2.94
Alternate 1 Configuration: A series of four models were executed using Alternate 1 diffuser
configuration (three 8" ports) to cover flows of 12.5 mgd and 20 mgd and water levels of High
Rock Lake full pond and High Rock Lake 5 feet below full pond. The session reports and
prediction files are included in Appendices 6-9 and are summarized in Table 5 below.
Table 5
Pollutant Concentration (%)
Dilution Factor
Discharge. Velocity (m/s)
12.5 mgd 12.5 mgd 20 MGD 20 MGD
Full Pond 5 ft helow FP Full Pond 5 ft below FP
2.7
3.8
3.0
4.3
36.7
26.6
33.4
23.5
5.62
5.62
9.0
9.0
Alternate 2 Configuration: A series of four models were executed using Alternate 2 diffuser
configuration (single 14" port) to cover flows of 12.5 mgd and 20 mgd and water levels of High
Rock Lake full pond and High Rock Lake 5 feet below full pond. 'The session reports and
prediction files are included in Appendices 10-13 and are summarized in Table 6 below.
Table 6
Pollutant Concentration (%)
Dilution Factor
Discharge Velocity (m/s)
12.5 mgd 12.5 mgd 20 MGD 20 MGD
Full Pond 5 ft below FP Full Pond 5 ft below FP
2.3
5.3*
2.4
3.4
42.7
18.9
41.7
29.3
5.51
5.51
8.82
8.82
* This result as reported in the model is incorrect. The correct concentration is 3.2%.
Page 3 of 4

Conclusions: It is evident from the results in Table 4 that more complete mixing occurs at
higher effluent discharge rates, illustrating that the existing configuration was designed for flows
much greater than those included in the Salisbury -Rowan WWTP NPDES permit. To improve
effluent mixing, the two alternatives considered are to reduce the port size or to reduce the
number of ports. From the results in Tables 5 and 6, it is clear that either solution will achieve
nearly equally desirable results.
It is interesting to note the inconsistency in the result for 12.5 mgd effluent flow with water depth
at 5 feet below High Rock Lake full pond, which is reported as a pollutant concentration of 5.3%.
This occurs at a calculation segment boundary that increases the plume width by a factor of 3.77
(from 11.6 m to 43.6m) to conserve mass flux for the next calculation segment (see appendix
11). Considering the change in effluent concentration in the other 5 pairs where water level is
changed, but flow is held constant; the correct concentration works out to be 3.2%.
When cost, discharge velocity and mixing performance are considered, Salisbury -Rowan Utilities
proposes to make improvements to the Yadkin River Diffuser consistent with the modifications
modeled in Alternative 2. Two of the existing ports will be capped, leaving one existing 14"
diffuser port. The port nearest the center of channel will remain in service.
Based on the proposed modifications, SRU calculates the new in -stream waste concentration to
be 3.2% (31.3 dilution factor) for 12.5 mgd effluent discharge. If the same diffuser configuration
were used for 20 mgd effluent discharge, the in -stream waste concentration will be 3.4% (29.3
dilution factor).
Page 4 of 4

REASONABLE POTENTIAL ANALYSIS
Salisbury - Rowan WWTP
NCO023884
Time Period 112003-10/2004
Qw (MGD) 12.5
WWTP Class IV
7Q10S (cfs) 263.5
IWC (%) @ 7QIOS 6.8493
7Q10W(cfs) 0
®7Q10W WA
30Q2 (cfs) 0
® 30Q2 WA
Avg. Stream Flow, QA (cfs) 4879
@ QA 0.3955
Rec'ving Stream Yadkin River
Stream Class WS-V
Outfall 001
Qw=12.5MGD
STANDARDS &
PARAMETER
TYPE
CRITERIA (2)
POL
Units
REASONABLE POTENTIAL RESULTS
PRELIM. RESULTS
RECOMMENDED ACTION-
i1I
NC WQS1 ➢,FAV(
a /Dot. MaxPredCw Allowable Cw
Chronic Acute
Acute: N/A
No acute standard or 112 FAV
Arsenic
NC
50
ug/L
12 0
9.2
_ _ ___ __
Chronic: 730
___ _ _ _WA_ _ _ __
MaxPredCw < Chronic
No action all values telow, detection
MONITOR?
Acute: 15
MaxPredCw < Acute
Cadmium
NC
2 15
ug/L
15 1
5.4
MONITO_RT_
_ _ ___ __
Chronic: 29
___ _ _ __
MaxPredCw < Chronic
No action 14 of 15values below detaction
'
MONITOR?
Acute: 1,022
MaxPredCw < Acute
Chromium
NC
50 1,022
ug/L
12 4
309.7
MONITOR?
_
Chronic: 730
_
MaxPredCw < Chronic
No action no exceedance of allowableconc
MONITOR?
Acute: 7
MaxPredCw > Acute
Conknue'2/mohth rnondornng -
Copper
NC
7 AL 7.3
ug/L
55 11
79.0
D_AIL_Y MAX_LIM_IT?
__ _ ___ _
Chronic: 102
__
MaxPredCw < Chronic
__
MONITOR?
Acute: 22
MaxPredCw < Acute
Drop quarterlyinonitonng
Cyanide
NC
5 N 22
10
ug/L
34 1
13.9
MONITOR?
___ __
Chronic: 73
___ _ _ __
MaxPredCw< Chronic
MONITOR?
_
Acute: 34
MaxPredCw < Acute
No action no exceedance of allowable conc: , - -.
Lead
NC
25 N 33.8
'ug/L
15 2
24.1
_ _ __
MONITOR?
__
Chronic: 365
___ _ _ __
MaxPredCw < Chronic
_
MONITOR?
-^s
Acute: N/A
No acute standard or 1/2 FAV
Mercury
NC
0.012
0.0002
ug/L
16 2
12452
------------------WA-----------
Chronic: 0.18
MaxPredCw >Chronic
Add 2/month mondormg unLIDWQ strategy finalized
MO AVG LIMIT?
Acute: 261
MaxPredCw <Acute
No action no exbeedahce of allowable conc ,,
Nickel
NC
88 261
ug/L
16 1
11.9
MONITOR?
_ _ ___ __
Chronic: 1,285
___ _ _ __
MaxPredCw < Chronic
_ __"'
MONITOR?
Acute: 56
MaxPredCw > Acute
Add' dailymaxtmum'limitmax. pred Exceeds allowable col
Selenium
NC
5.0 56
ug/L
15 2
300.0
D_AIL_Y M_AX_LIM_IT7
_
Chronic: 73
__
MaxPredCw > Chronic
_
$ �'.
MO AVG LIMIT?
Acute: - 1 -
MaxPredCw > Acute
Continue 2/month monitoring
Silver
NC
0.06 AL 1.23
ug/L
57 3
10.8
DAILY MAX
__ _ ___ __
Chronic: 1
____
MaxPredCw>Chronic
MO AVG LIMIT?i
s
Acute: 67
MaxPredCw > Acute
Add 2Jmonth monitonr g
Zinc
NC
50 AL 67
ug/L
17 13
181.1
------------------DAILY--
MAX_LIM_IT? __
__;� =_ _ - �> •Q`;
Chronic: 730
MaxPredCw < Chronic ..
MONITOR?
Legend: " Freshwater Discharge
C = Carcinogenic
NC = Non -carcinogenic
A = Aesthetic
23884.rpa2004, rpa
11/14/2005

d4j)

City of Salisbury Permit Meeting
November 15, 2005
Archdale Building
Raleigh NC
Introductions
• City of Salisbury
• Division of Water Quality
Discussion on NPDES Permit Comments
• Treatment train description
• Selenium limit/monitoring ✓ 7j y�. w�'� ,,,�✓
• Mercury limit/monitoring
• Instream Waste Concentration/ 7Q10
IWC calculated from dilution of CORMIX model
J
..�f At 12.5 MGD, dilution of 14.6:1, 1/14.6 *100 = 6.85%
At 20 MGD, dilution of 15.5:1, 1/15.5* 100=6.45%
7Q10 flow used in 1995 CORMIX model — 1030 cfs
Calculation of effective 7Q10 — a back calculation from the dilution ratio
Final Decisions
Conclusion/Remarks

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City of Salisbury Permit Meeting
November 15, 2005
Archdale Building
Raleigh NC
I. Introductions
■ City of Salisbury
■ Division of Water Quality
II. Discussion of draft NPDES Permit
Y ■ Treatment train description
■ Added four primary clarifiers and two tricklingfilters
ilters
V ■ Copper, silver and zinc monitoring reduction
■ Because of your good toxicity test results, recommend
reduction from 2/month to 1/month monitoring
v ■ Selenium delayed limit/monitoring
A delayed daily maximum limit of 56 u 1 will begiven.
Facility will be given a 15/18 month compliance schedule to
find sources of Se. Will sample monthly during this schedule.
Can resubmit Se data (12 datapoints) for reevaluation of RPA
to see if limit would still be needed.
v ■Annual effluent pollutant scan
Per 40 CFR 122.21, Spec.cond. will be added to permit
requiring_ pollutant scans so that data can be submitted at next
permit renewal.
and
it. EPA o
Reevaluation shows that hits in Feb. 2002 but 35 below detects
since that time. EPA has agreed that facility does have to limit
but must monitor for at least 12 months at the Method 1631E
for reevaluation of RPA. JM
Dilution/IWC

City of Salisbury Permit Meeting
November 15, 2005
Archdale Building
Raleigh NC
I. Introductions
■ City of Salisbury
■ Division of Water Quality .
II. Discussion of draft NPDES Permit
■ Treatment train description
■ Copper, silver and zinc monitoring reduction
■ Selenium delayed limit/monitoring
■ Annual effluent pollutant scan
■ Dilution and Mercury monitoring
III. Final Remarks/Conclusion

US
M. Final Remarks/Conclusion

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Amended Fact Sheet - NPDES Permit
Salisbury -Rowan WWTP
NPDES No. NCO023884
Faculty;
Receivina Stream
Facility Name:
Salisbury — Rowan
WW,I,P
Receiving Stream:
Yadkin Rivet
Permitted Flow (MGD):
12.5 MGD
Subbasin:
030704
Facility Class:
IV
Index No.:
Facility Status:
Existing
Stream Class:
WWS-V
Permit Status:
Renewal
303(d) Listed:
No
County:
Rowan
Use Support:
Regional Office:
Mooresville
Drainage Area (m12):
3,377
USGS Topo Quad:
E17NW
Summer 7010 (cfs)
1030 cfs
Salisbury, NC
Effective 7010
263.5 cfs (based on 14.6:1
dilution instream)
Average Flow (cfs):
4,879
IWC (%):
6.85
Facf ht
Receiving .Stream
Facility Name:
Salisbury — Rowan
WW,�
Receiving Stream:-
Yadkin Rivet
Permitted Flow (MGD):
20.0 MGD
Subbasin:
030704
Facility Class:
IV
Index No.:
Facility Status:
Existing
Stream Class:
CIS-V
Permit Status:
Renewal
303(d) Listed:
No
County:
Rowan
Use Support:
Regional Office:
Mooresville
Drainage Area (mi2):
3,377
USGS Topo Quad:
E17NW
Summer 7070 (cfs)
1030 cfs
Salisbury, NC
Effective 7010
449.5 cfs (based on 15.5:1
dilution instream)
Average Flow (cfs):
4,879
IwC (%):
6.45
E

Corrections to the Factsheet
Per EPA comment the following paragraph should be corrected to include the last sentence:
Salisbury has a full pre-treatment program, with 4 SIUs (Significant Industrial Users) and 5 CIUs
(Categorical Industrial Users) per its application. DWQ recommends that Salisbury continue to
implement the full pretreatment program and its Long Term Monitoiring Plan through the
renewed permitting cycle.
Salisbury Comments on the draft permit
1. Request that limitations/monitoring for selenium is dropped: The 35 ug/l sample in 2004 is not
representative of the Salisbury effluent and should not be considered in the analysis of effluent data.
All other values are below detection. Recommend that it be monitored (quarterly) in the LTMP.
DWQ response: The 35 ug/1 sample in May 2004 was reported in an amended DMR submitted by
Salisbury in November 2004. Due to problems with instruments, metals and other parameters were
not run in time to report on the correct DMR. The data was reported as part of LIMP. The City
did not report that sample was not representative at the time of its submittal. No information from
lab that indicated that sample was contaminated. Recommend that facility have delayed limit for
selenium, with 12-month compliance schedule with monthly monitoring for selenium and limit will
become effective twelve months from effective date of the permit. If Salisbury submits 12 data
points and the data does not show reasonable potential to exceed the allowable concentration then
selenium limit/monitoring in the NPDES permit will be dropped.
2. Request that monitoring for mercury is dropped: The hits (0.4 and 0.3 ug/1) in 2002 are not
representative of the Salisbury effluent. Recommend that it be monitored quarterly in the LTMP.
All other values are below detection.
EPA response: Interim objection to the permit (rec'd 2/4/2005) due to RPA showing that Hg limit
should be given but only monitoring given and question that facility should be using Method 1631E
in its analysis. After discussion of these issues in a January 27 2005 telecon, EPA recommended that
facility have a delayed mercury limit of 0.180 ug/1 with a 18 month compliance schedule, if collected
data shows no RP, then limit/monitoring in the NPDES will be dropped. Need to address the
mercury sampling method and resolve.
DWQ response: Recommend a delayed mercury limit with a 12-month compliance schedule, if
collected data shows no RP, then limit/monitoring in the NPDES will be dropped.
3. Correction of the instream waste concentration based on a normal calculation that reflects the
actual, documented riverine conditions at the diffuser and the 7Q10 of 833 cfs at the diffuser.
DWQ response:
Background on development of Salisbury effluent limits.
CORMIX model used by DWQ in 1995. Objective was to predict mixingand develop effluent
limits for alternative outfall designs.
Design conditions: combination of riverine and lacustrine conditions
7Q10 = 1030 cfs (29.1 m3/s)
Full pool scenario used to develop toxics limits.
Mixing zone not to exceed 1 /3 of channel width.
Standard must be met at edge of mixing zone.
6

Toxics limits based on dilution at the edge of mixing zone.
To improve mixing between the effluent and the Yadkin River. Salisbury constructed a 3 port
diffuser with a minimum 14.6 :1 dilution ratio at 12.5 MGD.
At 12.5 MGD, dilution is 14.6:1 (based on CORMIX model results), Dilution = 1/IWC , IWC =
0.0685 * 100 = 6.85%
The effective 7Q10 at 14.6:1 is 263.5 cfs, which is backcalculated from the dilution ratio. This
effective 7Q10 is used as input for analysis of metals limits.
At 20 MGD, dilution is 15.5:1 (based on CORMIX model results), Dilution = 1 /IWC, IWC =
0.0645 * 100 = 6.45%
The effective 7Q10 at 15.5:1 dilution ratio, is 449.5 cfs, which is backcalculated from the dilution
ratio. This effective 7Q10 will be used as input for analysis of metals limits.
Therefore, at 12.5 MGD, the IWC=7% and at 20 MGD, the IWC is 6%.
Note: An error was made in the previous permit when the effective 7Q10 of 263.5 cfs (instead
of 449.5 cfs) was also used for the expansion flow of 20 MGD. The incorrect IWC of 10.5%
at 20 MGD was listed in the previous permit and whole toxicity testing requirement. The
correct IWC of 6.45% —6% will now be used.
4.Correction of the description of the Grant Creek Treatment train.
DWQ response: Will include four (4) primary clarifiers and two (2) trickling filters on the permit
supplement cover page.
Jmn—11/14/2005
7

Additional info for Salisbury -Rowan WWTP permit
1/27/05 - Call to Marshall Hyatt at EPA, Region IV,
Marshall had reviewed the mercury strategy develop by Tom Belnick and it made sense.
l
Craig ??? looked at the TMDL p.37 last paragraph indicated that limits will be given.
EPA recommended solutions:
1) Do a delayed limit of 18 months
2) Sample influent (source water) and effluent Hg levels to show that they are not adding
Hg to the stream.
Salisbury — has dilution allowed into the Yadkin River. Need to used method 16313
Offer a delayed limit for 18 months. If they are below 180 ng/l, then the limit will be
removed.
In Region IV, everyone is doing (?) — method 1631 ???
• Resolve the 163le issue with Salisbury
• Run quickly and get the data points.
Tom B. asked if there were any variances for Hg with other states. ---Marshall did not
know the answer to that question.
Final result: DWQ is going to receive an interim objection letter for Salisbury
NPDES received a copy of objection letter (dated Jan. 31, 2005) on Feb. 4, 2005.
Salisbury cc'd on letter.
2/17/2005- Received Salisbury comments on the draft permit.
1) want Hg and Se monitoring deleted
2) Want the Se limit deleted.
3) Want IWC based on normal calculations and to reflect the riverine conditions
and the 7Q10 = 733 cfs. They do not want to run the CORMIX.
The Division has said that a CORMIX model needs to be run.

REASONABLE POTENTIAL ANALYSIS
Salisbury - Rowan WWTP
NCO023884
Time Period 112002-5/2005
Qw (MGD)
20
7Q10S (cls)
449.5
7Q10W (C/s)
0
3002 (Cis)
0
Avg. Stream Flow, QA (cis)
4879
RecWng Stream Yadkin River
WW FP Class IV
IWC(%) ®7010S 6.4516
® 7Q10W N/A
® 3002 N/A
® QA 0.6314
Stream Class WS-V
Outfal 1001
Ow=20MGD
STANDARDS&
PARAMETER
TYPE
CRITERIA (2)
POL
Units
REASONABLE POTENTIAL RESULTS
PRELIM. RESULTS
RECOMMENDED ACTION
NC WQS/ Yi FAVr
n ADet. MaxPredCw Allowable Cw
(1)
Chronic Acote
Acute: N/A
No acute standard or 1/2 FAV
Arsenic
NC
50
ug/L
12 0
9.2
WA
------' - -
=----------- ------------
-----------
Chronic: 775
----'—'—'-----------
MaxPredCw . Chronic
No action, all values below detection
MONITOR?
Acute: 15
MaxPredCw < Acute
Cadmium
NC
2 15
ug/L
15 1
5.4
MONITOR? _ ___
_ _ _ _ _ _ _ -------------
_
Chronic: 31
___ _
MaxPredCw < Chronic
No action, 14 of 15 values below. detection
MONITOR?
Acute: 1,022
MaxPredCw < Acute
- -
Chromium
NC
50 1.022
ug/L
12 4
309.7
MONITOR?
--'—'---'—'
Chronic: 775
'-----------------'—
MaxPredCw < Chronic
-------'---------------------'----
No action, noexceedance of allowable conc.
MONITOR?
Acute: 7
MaxPredCw > Acute
Continue 2/monthmonitoring
Copper
NC
7 AL 7.3
ug/L
55 11
79.0
-----------
DAILY MAX LIMIT?
--—'—'—'—'—'----- —
------ ------------- --'=-----_-
Chronic: 109
MaxPredCw . Chronic
,
MONITOR?
Acute: 22
MaxPredCw < Acute
Drop quarterly monitoring -.
Cyanide
NC
5 N 22
10
ug/L
34 1
13.9
----
MONITOR?
----------------- -
------------------------------
------
Chronic: 78
MaxPredCw < Chronic
MONITOR?
Acute: 34
MaxPredCw < Acute
No action, no exceedanca of allowable conc..
Lead
NC
25 N 33.8
ug/L
15 2
24.1
MONITOR?
-_-_-__________ -
-------- -__- __-___-___-__--____
_____-_-___
Chronic: 388
__
MaxPredCw. Chronic
MONITOR?
-
Acute: N/A
No acute standard or 1/2 FAV
- -
Mercury
NC
0.012
0.0002
ug/L
16 2
1.2452
......................
WA _ _ _ _
-------------------------------
Chronic: 0.19
MaxPredCw > Chronic
Add 2/month monitoring, until DWO strategy finalized..
MO AVG LIMIT?
Acute: 261
.MaxPredCw. Acute
Noaction, no exceedance,of. allowable conc. ..
Nickel
NC
88 261
ug/L
16 1
11.9
-----------
MONITOR?
------'-'-T ------
Chronic: 1,364
MaxPredCw .Chronic
--=-------.------.----------------
MONITOR?
-
Acute: 56
MaxPredCw > Acute
Add daily maximum limit, max. pred. Exceeds allowable coi
Selenium
NC
5.0 56
ug/L
15 2
292.5
DAILY MAX LIMIT?
----------'—'—'-----
-
--'---'---'
Chronic: 78
MaxPredCw>Chronic
-----------'---------------------'-
MO AVG LIMIT?
Acute: 1
MaxPredCw > Acute
Continue 2/month monitoring ,.
Silver
NC
0.06 AL 1.23
ug/L
57 3
10.8
-----------
DAILY MAX LIMIT?
--'-'-'-'-----------
"
----- -------------------------
Chronic: 1
MaxPredCw > Chronic
-
MO AVG LIMIT?
Acute: 67
MaxPredCw > Acute
Add 21month monitoring
Zinc
NC
50 AL 67
ug/L
17 13
181.1
DAILY MAX LIMIT?
_ -
Chronic: 775
MaxPredCw . Chronic
MONITOR?
;,-
Legend: " Freshwater Discharge
C = Carcinogenic
NC = Non -carcinogenic
A = Aesthetic
23884.rpa20mgd.updteff7g10, rpa
11/14/2005