NC0023884_Permit Issuance_19960401

Staf�Q gf i !Orth Carolina
Department of Environment,
.t Health and Natural Resources
Division of Environmental Management
James B. Hunt, Jr., Governor
Jonathan B. Howes, Secretary
A. Preston Howard, Jr., P.E., Director
Mr. David W. Treme
City of.Salisbury
P. O. Box 479
Salisbury, North Carolina 28145
Dcar; ir. Treme:
�EHNR
April 1, 1996 r)
Subject: NPDES Permit Issuance
Permit No. NCO023884
Grants Creek WWTP
Rowan County
iu accuidaucc with the application for a discharge pernut, the Division is forwarding hei7ewith the
subject NPDES 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 US Environmental
Protection Agency dated December 6, 1983.
On February 23, 1996, the Division received your facsimile with comments on the draft permit.
Below is a summary of your comments and the Division's response.
1) Remove the 85 percent removal requirement for total suspended residue (TSR).
The Division will reconsider this request upon receiving evidence that the City is in the process of
trying to eliminate inflow and infiltration. Your letter shows that the influent TSR levels in the
industrial wastewater are above the average TSR levels. Also, the low influent BOD and TSR levels
suggest that inflow and in -filtration problems are present. Provide the population served by each
treatment plant in any future requests. Enclosed is 4,copy of excerpts from the code of federal
regulations which concern inflow and infiltration.
ri
2) Modify the effluent sheet to reflect the simultaneous discharge through the diffuser by both plants.
The Division will grant this request and also will modify the supplement page to reflect this change.
3) Delete the monitoring requirements for chlorine after relocation to the Yadkin River because the
discharge will have ultraviolet disinfection.
The Division will grant this request.
4) Add language to the in -stream monitoring sheets allowing sampling to be discontinued while flows
or weather conditions present a safety hazard.
The Division will grant this request.
5) Add the pollutant analysis requirements to the proper effluent sheets.
The Division will grant this request. This requirement will be only for the 7.5 MGD flow.
6) Add corresponding flow limits to Part III, Conditions G., H., and 1.
The Division will grant this request.
P.O. Box 29535, Raleigh, North Carolina 27626-0535 Telephone 9 ; 9-733-5083 FAX [phone]
An Equal Opportunity Affirmative Action Employer 50% recycled/ 10% post -consumer paper

r 7) Delete the monitoring requirement for toluene in the effluent sheets.
The Division has studied the past three years of effluent data from the Grants Creek plant and the
toluene concentration has been above detection eleven times. You may apply for a permit
modification to remove the monitoring requirement after twelve months of continued sampling.
The last item in your letter is a request to modify the Town Creek permit to change the date required for
removing the discharge to June 30, 1998. The Town Creek permit will be valid until July 31, 1998 if the
discharge is not removed earlier. Mr. Jay Lucas of my staff called Mr. Barrett Lasater to clarify any
confusion. Mr. Lasater said that the City meant to request that toxicant limits be suspended until June 30,
1998. The Division cannot grant this request due to the potential for cadmium and cyanide to affect the
receiving stream.
Please take notice this permit is not transferable. Part II, E. 4, addresses the requirements to be
followed in case of change in ownership or control of this discharge.
This permit does not affect the legal requirements to obtain other permits which may be required by
the Division of Environmental Management or permits required by the Division of Land Resources,
Coastal Area Management Act or any other Federal or Local governmental permit that may be required.
If you have any questions concerning this permit, please contact Mr. David Goodrich at telephone
number [phone], extension 517.
Sincerely,
Original Signed By
David A. Goodrich
A. Preston Howard, Jr., P.E.
cc: Central Files
Mooresville Regional Office, Water Quality
Mr. Roosevelt Childress, EPA
Permits agineerin* Une
Facility Assessment Unit
Aquatic Survey and Toxicology Unit
Technical Assistance and Certification Group

Permit No. NCO023884
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT, HEALTH, AND NATURAL RESOURCES
DIVISION OF AO'EME-l1T W �
PERMIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
In compliance with the provision of North Carolina General Statute 143-215.1,
other lawful standards and regulations promulgated and adopted by the North Carolina
Environmental Management Commission, and the Federal Water Pollution Control Act, as
amended,
City of Salisbury
is hereby authorized to discharge wastewater from a facility located at
Grants Creek Wastewater Treatment Plant [ _
b1csR Q /9/J �rk67 �,-fry
Sic
Rowan County
to receiving waters designated as E;rmtstz k md•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.
This permit shall become effective ,
Zoe `t`
This permit and authorization to discharge shall expire at midnight on July 31, +9987
Signed this day A9r36
Original Signed By
David X Goodrich
—A-ncsw: air a.�e for
Division of t �Q
By Authority of the Environmental Management Commission

f
r
•
v
a
is hereby authorized to:
N
2.
Permit No. NC0023884
SUPPLEMENT TO PERMIT COVER SHEET
City of Salisbury
t Grants Creek WWTP, Q'T8'ZU, S�, Rowan
County ( , and Iql:r 6.4 *r-7
After receiving an Authorization tC
Management, construct an outfall 1
connect the Grants Creek and Tow
which will expand discharge to 12
ict from the Division of Environmental
a diffuser to the Yadkin River, simultaneously
Wastewater Treatment Plants to the outfall
, and expand treatment to 20 MGD, and
wo:� — V
3. Discharge from said treatment works at the 1 on specified on the attached map into
rAdkai., R; which is classified as class J9 waters and is
c in the Yadkin River Basin.
ov 7.5 PM G a &Ae* ,hers
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Grants Creek Outfall
56
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A. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS FINAL
Permit No. NCO023884
During the period beginning on the effective date of the permit and lasting until relocation to tl* Y�Akin River, the Permittee is authorized
to discharge from outfall serial number 001.'-$uch discharges shall be limited and monitored by the )errnittee as specified below:
Effluent Characteristics
Flow
BOD, 5 day, 20 °C** (April 1 - October 31)
BOD, 5 day, 20 °C** (November 1 - March 31)
NH3 as N (April 1 - October 31)
NH3 as N (November 1 - March 31)
Dissolved Oxygen***
Total Suspended Residue**
Fecal Coliform (geometric mean)
Total Residual Chlorine
Total Nitrogen (NO2+NO3+TKN)
Total Phosphorus
Temperature, °C
7.5 MGD
15.0 mg/I
30.0 mg/I
6.0 mg/I
12.0 m g/I
30.0 mg/I
200/100 ml
Discharge Limitations
Weekly Avg
22.5 mg/I
'S 0 mg/I
45.0 mg/I
400/100 ml
Daily Max
honitoring
Requirements
Aleasurement
Sample
*Sample
Frequency
Type
Location
Continuous
Recording
I or E
Daily
Composite
E,I
Daily
Composite
E,I
Daily
Composite
E
Daily
Composite
E
Daily+
Grab
E,U,D
Daily
Composite
E,I
Daily+
Grab
E,U,D
Daily
Grab
E
Monthly
Composite
E
Monthly
Composite
E
Daily+
Grab
E,U,D
*Sample location: E - Effluent, I - Influent, U - Upstream (see attached sheet), D - Downstream (s attached sheet)
Upstream and Downstream samples shall be grab samples
+ Upstream and Downstream monitoring is to be conducted three times per week during June, July. A ust, and September and
once per week during the rest of the year.
i
**The monthly average effluent BOD5 and Total Suspended Residue concentrations shall not exceed 15% of th espective
influent values (85% removal).
***The daily average dissolved oxygen effluent concentration shall not be less than 5 mg/1.

A. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS FINAL
Permit No. NC0023884
During the period beginning on the effective date of the permit and lasting until relocation to the Yadkin River, the Perrnittee is authorized
to discharge from outfall serial number 001. h discharges shall be limited and rn to ed by the ;.errnittee as specified below:
Effluent Characteristics �.,\ DischaraeLimitations Monitoring Reguirements
MgA urement -SAMg
Mon. Av\ Weekly Avg. ; Daily Max e gent Type
;..Cadmium \ Fr
\ 2/month Composite
Nickel 2/month Composite
✓Cyanide 2/month Grab
Copper / 2/month Composite
Zinc 2/month Composite
✓Lead % 3 µg/1 Weekly Composite
Silver 2/month Composite
Mercury Oµg/1 Weekly Composite
Toluene 2/month Grab
Chromium, µg/1 Weekly Composite
Fluoride mg/I Weekly Composite
Al ium 2/month Composite
To a 'ssolved Solids 2/month Composite
Chl des 2/month Composite
Chronic Toxicity**** uarterly Composite
ally Composite
****Chronic Toxicity (Ceriodaphnia) P/F at 67%; March une, September, December; See Part IQ,
*****See Part III., Condition M. %
The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units and shall be monitored daily at the effluent
by grab sample.
There shall be no discharge of floating solids or visible foam in other than trace amounts.
*Sample
Locatio
E
E
E
E
E
E
E
E
E
E
E
E
E
E

A. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS FINAL :rmit No. NCO023884
During the period beginning d after expansion above 12.5 M(' and lasting until expiration, the
Permittee is authorized to discharge from outfall serial number 001. Such discharges shall be limfic1 and monitored by the permittee
as specified below:
Effluent Characteristics
Mon. Avg-
Flow Z 20.0 MGD
BOD, 5 day, 20 ° tiApril 1 - October 31) �'5.0 mg/1
OD, 5 day, 20 ° ovember 1 - March 31) -10.0 mg/1
NH3 as N (April 1 - October 31) --- 2.0 mg/!
NH3 as N (November j;- March 31) 4.0 mg/1
Dissolved Oxygen""' 3
Total Suspended Residue-9- 30.0 mg/1
Fecal Coliform (geometric mean) 2001100 ml
Total Nitrogen (NO2+NO3+TKN)
Total Phosphorus
Temperature C Q�Sample
location: E - Effluent, I - Influent, U - U
Upstream and Downstream samples shall be grab
Upstream and Downstream monitoring is to e
ar.
once per week during the rest of the ye
(��The monthly average effluent BOD5
influent values (85% removal).
Discharge Limitations
Weekly A-�y- Daily Max
7.5 mg/1
15.0 mg/1
45.0 mg/1
400/100 ml
(see attached sheet), D -
�amples \
conducted three times per week during June,
Monitoring Requirements
Measurement
Sam le
-'`gample
quency
Tvae
coca
Continuous
Recording
I or E
Daily
Composite
E,I
Daily
Composite
EI
Daily
Composite
E
Daily
Composite
E
Daily-C
Grab
E,U,D
Daily
Composite
E,I
Daily%K
Grab
E,U,D
Monthly
Composite
E
Monthly
Composite
E
Daily
Gra >
E,U,D
D
(seo atta=d sheet)
y. August, and September and
Total Suspended Residue concentrations shall not exceed
v The daily average dissolved oxy�en effluent concentration shall not be less than 6 mg/l.
of the respective

A. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS FINAL
Permit No. NCO023884
During the period beginning aftc relocation to the Yadkin River and after expansion above 12.5 Mt;D and lasting until expiration, the
Permittee is authorized to discharge from outfall serial number 001. Such discharges shall be limited and monitored by the permittee
as specified below:
Effluent Characteristics
Mon. Avg.
Discharge Limitations
Weekly Avg. Daily Max
Cadmium \
Nickel
Cyanide \, 77.5 µg/I 310 µg/I
Copper
Zinc
Lead
Silver
Mercury 0.19 µg/1 0.75 jig/I
Toluene
Tetrachloroethylene
Chronic Toxicity" .%
**Chronic Toxicity (Ceriodaphnia) P/F at 6%; March, June, September, December;
The pH shall not be less than 6.0 standard units nor greater than 9.0 standard unit.sran
sa
There shall be no discharge of floating solids or:visible foam in other than trace amounts.
Monitoring Requirements
Measurement
Sample
'Sample
Frequency
Type
Location
2/month
Composite
E
2/month
Composite
E
Weekly
Grab
E
2/month
Composite
E
2/month
Composite
E
2/month
Composite
E
2/month
Composite
E
Weekly
Composite
E
2/month
Grab
E
2/month
Grab
E
Quarterly
Composite
E

A. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS FINAL Permit No. NCO023884
During the period beginning Pe teThe d lasting until exiaand, the Permittee is
authorized to discharge from outfall serial number 001. Such discharges shall be limited and monitc- red by the permittee as
specified below:
Effluent Characteristics Discharge Limitations- Monitoring Reg_uirements
-7, Se' Measurement Sample �ncatio
'
Weekly Av4. Dailv Max Frequencv Type )LoD
Flow*'. !1 D Continuous,-' Recording I or E
BOD, 5 day, 20 ° April 1 - October 31) -�15.0 mg/I 22.5 mg/I Daily Composite E,1
BOD, 5 day, 20 ° (November 1 - March 31) L-*30.0 mg/1 45.0 rng/I Daily Composite E,1
NH3 as N (April 1 - October 31) 6.0 mg/I Daily Composite E
NH3 as N (November - a 31) 12.0 mg/I Daily Composite E
issolved Oxyge 3 D it
Total Suspen a Residue`' 7- 30.0 mg/I 45.0 mg/I Daily Composite
Fecal Coliform (geometric mean)_ 200/100 ml 400/100 ml it � Gra E
Total Nitrogen (NO2+NO3+TKN) uj MrttTly� Composite or
Total Phosphorus M&M+ tly % Composite E
*empera4ture, °C Gra EU�
ample location: E - Effluent, I - Influent, U - Upstream (see attached sheet), D - Downstream (sec; attached sheet)
Upstream and Downstream samples shall be grab sample
')4Upstream and Downstream monitoring is to be conducted three times per week during June, July, August, and September and
once per week during the rest of the year.
*The ivision f Envir nm t ana men shall b notified efore o to thadkin�River.
Th Tow reek TP 23 2 s 11 be re cinded on disch e to the YacYkin Rivc:r.
P �) fl
(,) 'he monthly average effluent BOD5 and Total Suspended Residue concentrations shall not exceed 15% of the respective
influent values (85% removal).
* The daily average dissolved oxygen effluent concentration shall not be less than 5 mg1l.

A. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS FINAL
Permit No. NC0023884
During the pe ' oc g until expansion above 12.5 MGD, the Permittee is
authorized to discharge from outfall serial number 001. Such discharges shall be limited and monitored by the permittee as
specified below:
Effluent Characteristics
'Cadmium
Nickel
.Cyanide
-Copper
-Zinc
-Lead
—Silver
Mercury
Toluene
Tetrachloroethylene
Ch
ic Tcio i 't
Discharge
rt
Limitations
Monitoring
Requirements
Measurement
Sam
*Sample
Mon. Avg. Weekly Avg.
Daily Max
Frequency
Tvae
Location
2/month
Composite
E
73 g/I
2�g/I
2/month
Weekly
Composite
Grab
E
E
2/month
Composite
E
2/month
Composite
E
2/month
Composite
E
Oµg/I
`
05 µg/I
2/month
Weekly
Composite.
Composite
E
E
2/month
Grab
E
2/month
Grab
E
Q I
C
F
y runy ua er y omposite
Chronic Toxicity (Ceriodaphnia) P at°1o; March, June, September, December;
5
� The pH shall not be less than 6.0 standard units nor greater than 9.0 standard uni���-shall be mc�itnred-d il�� at the a »Pnt
b sample. (.%
. I I f i .
There shall be no discharge of floating solids or visible foam in other than trace amounts.

A. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS IN -STREAM
Permit No. NCO023884
During the period beginning on the effective date of the permit and lasting until expiration or discharge to the Yadkin River, the
Permittee is authorized to discharge from 07
s) serial number 001. Such discharges shall be limi:ed and monitored by the Permittee
Permittee as specified below:
Effluent Characteristics
Measurement Frequency
Sample
t_ oca• ion
Dissolved Oxygen
3/week Jun
1 - Sep
30
1/week Oct 1 May
31
1,2,3
Temperature, °C
3/week Jun
1 - Sep
30
1/week Oct 1 May
31
1,2,3
Conductivity
3/week Jun
1 - Sep
30
1/week Oct 1 May
31
1,2,3
Fecal Coliform
3/week Jun
1 - Sep
30
1/week Oct 1 - May
31
1,2,3
Turbidity
3/week Jun
1 - Sep
30
1/week Oct 1 - M ay
31
1,2,3
Chloro h II -a
1/week Jun
1 - Sep
30
3
TP, PO4
1/week Jun
1 - Sep
30
3
NO2, NO3, NH3-N, TKN
1/week Jun
1 - Sep
30
_
3
Monitoring sites:
1 - Third Street Extension Bridge
2 - 50 feet above Spencer WWTP outfall
3 - confluence of Grants Creek and the Yadkin River
As per 15A NCAC 2B .0505 (c) (4), stream sampling may be discontinued at such times 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 monito:-ing report for the month in which the
event occurred. This provision shall be strictly coast ed and may not be utilized to avoid the requirements of 15A NCAC 2B .0500 when
performance of these requirements is attainable. Wh n there is a discontinuance pursuant of this provision, stream sampling shall be
resumed at the first opportunity after the risk period as ceased.

A. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS IN -STREAM
Permit No. NCO023884
r
During the period beginning upon discharge to the Yadkin River and lasting until expiration, the Pennittee is authorized to discharge
from outfall(s) serial number 001. Such discharges shall be limited and monitored by the Permittee is specified below:
Effluent Characteristics
Measurement Frequency
Sample
I nca••inn
issolved Oxygen
3/week Jun
1 - Sep
30
1/week Oct 1
- May
31
;,I
-Temperature, °C
3/week Jun
1 - Sep
30
1/week Oct 1
- May
31
1 ,�
Conductivity
3/week Jun
1 - Sep
30
1/week Oct 1
- May
31
Fecal Coliform
3/week Jun
1 - Sep
30
1/week Oct 1
- May
31
1 ,�
Wurbidity
3/week Jun
1 - Sep
30
1/week Oct 1
- May
31
hloro h II -a
1/week Jun
1 - Sep
30
2
TP, PO4
1/week Jun
1 - Sep
30
2
N 2, N 3, NH -N, TKN
1/week Jun
1 - Sep
30
_
2 —
Monitoring sites:
1 - 200 feet upstream of outfall
2 - 0.7 miles above Southern Railroad bridge
As per 15A NCAC 2B .0505 (c) (4), stream sampling may be discontinued at such times 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 requir -ments of 15A NCAC 2B .0500 when
performance of these requirements is attainable. When there is a discontinuance pursuant of this provision, stream sampling shall be
resumed at the first opportunity after the risk period has ceased.

u 1r t+
Part [II Permit No. NC0023884
Y '
G. 7.5 MGD CHRONIC TOXICITY PASS/FAIL PERMIT LIMIT (QRTRLY)
The effluent discharge shall at no time exhibit chronic toxicity using test procedures
outlined in:
1.) The North Carolina Ceriodaohnia chronic effluent bioassay procedure (North Carolina
Chronic Bioassay Procedure - Revised *September 1989) or subsequent versions.
The effluent concentration at which there may be no observable inhibition of reproduction
or significant mortality is 67 % (defined as treatment two in the North Carolina procedure
document). The permit holder shall perform quarterly monitoring using this procedure to
establish compliance with the permit condition. The first test will be performed after- thirty
days from the effective date of this permit during the months of March, june,
September, and December. Effluent sampling for this testing shall be performed at the
NPDES permitted frnal effluent discharge below all treatment processes.
All toxicity testing results required as part of -this permit condition will be entered on the
Effluent Discharge Monitoring Form (MR-1) for the month in which it was performed,
using the parameter code TGP313. Additionally, DEM Form AT-1 (original) is to be sent to
the following address:
Attention: Environmental Sciences Branch
North Carolina Division of
Environmental Management
4401 Reedy Creek Road -
Raleigh, NC 27607
Test data shall be complete and accurate and include all supporting chemical/physical
measurements performed in association with the toxicity tests, as well as all dose/response
data. Total residual chlorine of the effluent toxicity sample must be measured and reported
if chlorine is employed for disinfection of the waste stream.
Should any single quarterly monitoring indicate a failure to meet specified limits, then
monthly monitoring will begin immediately until such time that a single test is passed.
Upon passing, this monthly test requirement will revert to quarterly in the months specified
above.
Should any test data from this monitoring requirement or tests performed by the North
Carolina Division of Environmental Management 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 and appropriate environmental controls, shall
constitute an invalid test and will require immediate re-testing(within 30 days of initial
monitoring event). Failure to submit suitable test results will constitute noncompliance
with monitoring requirements.

H. 1.2.5 MGD CHRON. TOXICITY PASS/FAIL PERMIT LIMIT QRTRLY)
The effluent discharge shall a o time exhibit chronic toxicity using st procedures
outlined in:
1.) The North Carolina Ceriodaphnia chronic effluent bioassay procedure (North Carolina
Chronic Bioassay Procedure - Revise *September 1989) or subsequent versions.
The effluent concentration at which there iybe no observable inhibition of reproduction
or significant mortality is 7 % (defined as trement two in the North Carolina procedure
document). The permit holder shall performartery monitoring using this procedure to
establish compliance with the permit condition. The first test will be performed after thirty
days from the effective date of this permit during the months of March, June,
September, and December. Effluent sampling for this testing shall be performed at the
NPDES permitted final effluent discharge below all treatment processes.
All toxicity testing results required as part of this permit condition will be entered on the
Effluent Discharge Monitoring Form (MR-]) for the month in which it was performed,
using the parameter code TGP3B. Additionally, DEM Form AT-1 (original) is to be sent to
the following address:
Attention: Environmental Sciences Branch
North Carolina Division of
Environmental Management
4401 Reedy Creek Road
Raleigh, NC 27607
Test data shall be complete and accurate and include all supporting chemical/physical
measurements performed in association with the toxicity tests, as well as all dose/response
data. Total residual chlorine of the effluent toxicity sample must be measured and reported
if chlorine is employed for disinfection of the waste stream.
Should any single quarterly monitoring indicate a failure to meet specified limits, then
monthly monitoring will begin immediately until such time that a single test is passed.
Upon passing, this monthly test requirement, will revert to quarterly in the months specified
above.
Should any test data from this monitoring re pirement or tests performed by the North
Carolina Division of Environmental Managem8tit 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 and appropriate environmental controls, shall
constitute an invalid test and will require immediate re-testing(within 30 days of initial
monitoring event). Failure to submit suitable test results will constitute noncompliance
with monitoring requirements.

♦ .4
I. 20 MGD CHRONIC TOXICITY PASS/FAIL PERMIT LIMIT (QRTRLY)
The effluent discharge shall at no time exhibit chronic toxicity using test procedures
outlined in:
1.) The North Caroling Ceriodaphnia chronic effluent bioassay procedure (North Carolina
Chronic Bioassay ProceA re - Revised *September 1989) or subsequent versions.
The effluent concentration at which there may be no observable inhibition of reproduction
or significant mortality is 6 %(defined as treatment two in the North Carolina procedure
document). The permit holder sh 1 perform quarterly monitoring using this procedure to
establish compliance with the pe condition. The fast test will be performed after thirty
days from the effective date of this permit during the months of March, June,
September, and December. Effluenl sampling for this testing shall be performed at the
NPDES permitted final effluent discharWelow all treatment processes.
All toxicity testing results required as part of this permit condition will be entered on the
Effluent Discharge Monitoring Form (MR-1) for the month in which it was performed,
using the parameter code TGP3B. Additionally, DEM Form AT-1 (original) is to be sent to
the following address:
Attention: Environmental Sciences Branch
North Carolina Division of
Environmental Management
4401 Reedy Creek Road
Raleigh, NC 27607
Test data shall be complete and accurate and include all supporting chemical/physical
measurements performed in association with the toxicity tests, as well as all dose/response
data. Total residual chlorine of the effluent toxicity sample must be measured and reported
if chlorine is employed for disinfection of the waste stream.
Should any single quarterly monitoring indicate a failure to meet specified limits, then
monthly monitoring will begin immediately until uch time that a single test is passed.
Upon passing, this monthly test requirement will evert to quarterly in the months specified
above.
Should any test data from this monitoring requirem t or tests performed by the North
Carolina Division of Environmental Management 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 and appropriate environmental controls, shall
constitute an invalid test and will require immediate re-testing(within 30 days of initial
monitoring event). Failure to submit suitable test results will constitute noncompliance
with monitoring requirements.

J. ,.NUTRIENT RE-OPENE�
This permit may e modified, or revoked and reissued to change the effluent limitation on nutrients for this
discharge dependiftg upon the following:
1. The findings of a st d by the Division of Environmental Management determine nutrient control is
necessary.
2. Local actions do not ' uc ssfully reduce the nutrient loading on the receiving waters.
3. The onset of probler*cond ` its in the receiving waters.
K. TETRACHLORORTHYLENE AND TOLUENE MONITORING
The tetrachloroethylene m itoring may be eliminated after a review of twelve months of
DMR data from the 12.5%Ddata
arge and toluene monitoring may be eliminated after a
review of twelve months f from the 7.5 MGD discharge if the Division of
Environmental Manage nnes that these compounds are not a concern.
L. RELOCATION IDF OUITFALL
The discharge to Grants Vreek must be eliminated by June 30, 1998. Discharge after this
date must be into the Yad River through the three port diffuser as determined by the
Division of Environment ajzement.
M. ANNUAL POLLUTAN'� ANALYSIS MONITORING (APAM)
The permittee shall conduct a to for pollut is annually at the effluent from the treatment plant. The
discharge shall be evaluated as fo ws: 1) pollutant analysis of the effluent must be completed annually
using EPA approved methods for t follow ng analytic fractions: (a) purgeables (i.e., volatile organic
compounds); (b) acid extractables; (c base/ eutral extractables; (d) organochlorine pesticides and PCB's
(e) herbicides; and (f) metals and other ' or anics. The Annual Pollutant Analysis Monitoring
Requirement Reporting Form A and acc anying memo, to be provided to all discharges affected by this
monitoring requirement, describes the s ling and analysis requirements and lists chemicals to be
included in the pollutant analysis. This in 'toring requirement is to be referred to as the "Annual
Pollutant Analysis Monitoring Requireme t' .
(2) Other significant levels of organic ch mical ust be identified and approximately
quantified. For the purpose of impleme ing this equirement, the largest 10 GC/MS peaks
in the purgeable base/neutral extractable and acid e tractable fractions (or fewer than 10, if
less than 10 unidentified peaks occur) f chemicals er than those specified on the
APAM Requirement Reporting Form A should be iden ' led and approximately quantified
as stated in the APAM Reporting Form A instructions. 's part (item 2) of the APAM
requirement is to be referred to as the " 0 significant peaks le").

NPDES WASTE LOAD ALLOCATION
PERMIT NO.: NC0023884
PERMITTEE NAME: City of Salisbury
FACILITY NAME: Grants Creek Wastewater Treatment Plant
Facility Status: Existing
Permit Status: Modification
Major Minor
Pipe No.: 001
Design Capacity:
12.5 MGD
Domestic (% of Flow):
Industrial (% of Flow):
72 %
28 %
Comments:
This permit will combine flow from the Town Creek WWTP and the
Grants Creek WWTP.
RECEIVING STREAM: the Yadkin River
Class: WS-V
Sub -Basin: 03-07-04
Reference USGS Quad: E 17 NW (please attach)
County: Rowan
Regional Office: Mooresville Regional Office
Previous Exp. Date: 7/31/93 Treatment Plant Class: Class IV
Classification changes within three miles:
none
Requested by: Jay Lucas
Date: 6/6/95
Prepared by:
Date: % L
Reviewed by:
Date:
Modeler
Date Rec.
#
H M
e3lo
Drainage Area (mil) 3, 37 —/ Avg. Streamflow (cfs): y 9 V
�Q10 (cfs) d..63 ,1 Winter 7Q10 (cfs) 30Q2 (cfs)
Toxicity Limits % Acute/ ronic_ 60
Instream Monitoring:
Upstream Location:upstream from diffuser outfall Downstream location: Yadkin River at the Town of Yadkin or 0.7 miles upstream of the railroad bridge.
Parameters: Temperature, DO, Fecal, Conductivity, Turbidity
Special instream momtonng locations or monitoring f xiuencies:
at downstream site: Jun. -Sep (1/wk) TP, POq, TKN, NH3N, NOx, Chl-A
Stnnrtter
Winter
Wasteflow (MOD):
12.5
12.5
BOD5 (mg/1):
15.0
30.0
NH3N (mg/1):
6.0
12.0
DO (mg/1):
•'5.0*
5.0*
TSS (mg/1):
­30.0
30.0
Fecal Col. (/100 ml):
-200.0
200.0
pH (Sin:
6.0-9.0
6.0-9.0
Residual Chlorine (µg/1):
'monitor
monitor
TP (mg/1):
moniitor
monitor
TN (mgft
monitor
monitor
* The daily avg. D.O. effluent concentration shall not be less than 5.0 mg/L
Toxicant
Cd
Weekly Ave.
monitor
Ni
monitor
Cyanide
73 ug/L
Cu
monitor
7n
monitor
Pb
monitor
Ag
monitor
Hg
0.17 ug/L
Toluene
monitor
-re-4 rack/arap _ r.u!<;,.
292.0 ug/L
0.65 ug/L
Aan,-�o r - A,4111-1
Comments: 0 7 ?10
i'oS.

LL
"A
_6
N"(1
J
00
r
\ii` /'''�-�,..,^ f� ��-!," •.% (� ''��` �� � � \.-f�" � � • `� 1 —_ '"-4. � ? ` aC` f,`r .� goof � I_ � \ '% ' b , � �.% � 'xy' � 1 J1 � � �(//\'\ � ��
*q7'
Yadkin River Outf all F
'Aft!
J1 I
17 Ic T L oa-L"
741 1
L I
L
us rossiZags
MV
-RIVER
Yadkin River
Downstream Sampling Point
X 67--
6-
15,
- IN
S5 age
SPOSar_,—
M
�k5o)
�u
V
Grants Creek Outfall
__4
V W
690'
650
A 4
N.
2120.,
North

MEMORANDUM
North Carolina Division of Environmental Management
Water Quality Section, Permits and Engineering Unit
TO: Carla Sanderson
FROM: Jay Lucass
SUBJECT: Salisbury - Grants Creek WWTP, NCO023884
DATE: Dec. 21, 1995
John Vest called me yesterday to confirm that Salisbury will build a
diffuser for this outfall. In our meeting on December 15th we decided to
have weekly average and daily maximum limits for metals and toxicants.
Attached is the fact sheet for the latest WLA. The required flow limits are
as follows:
7. 5 MGD to Grants Creek
12.5 MGD to the Yadkin River
20 MGD to the Yadkin River
cc: Project File

N.C. DEFT. OF
'NVIRONMENT, HEALTH,
& NATURAL RESOURCES
Facility Name:
NPDES No.:
Type of Waste:
Facility Status:
Permit Status:
Receiving Stream:
Stream Classification:
Subbasin:
County:
Regional Office:
Requester:
Date of Request:
Topo Quad:
FACT SHEET FOR WASTELOAD ALLOCATION JUL 19 1995
Request # 8310
Grants Creek WWTP DIVISION OF ENVIRONIUNTAL 11114GENENT
NC0023884 NOORESVILLE REGIGNAL DiFICE
72% domestic, 28% industrial
Existing 5 c� �-TBZ�Ci�.
Modification - (J j -}i7 Ya��� . CD r0o Ai
Yadkin River
WS-V
03-07-04
Rowan
Morresvill
Jay Lucas
6/6/95
E 17 NW
Stream Characteristic:
USGS #
Date:
Drainage Area (mi2):
Summer 7Q10 (cfs):
Winter 7Q10 (cfs):
Average Flow (cfs):
30Q2 (cfs):
IWC (%):
6/28/95
3,377 (see attached)
174 (see attached)*
not calculated
4,879 (see attached)
not calculated
10% (10:1 dilution)
* See attached sheet for a description of how the effective S7Q10 flow based on dilution was
calculated.
Wasteload Allocation Summary
(approach taken, correspondence with region, EPA, etc.)
The City plans three phases of construction to meet its present and future wastewater treatment needs.
Phase I: Relocate the Grants Ck. WWTP outfall from Grants Ck. to the Yadkin R. (7.5 MGD).
Phase II: Construct a force main from Town Ck. WWTP on Town Ck. to Grants Ck. WWTP's
outfall. This will combine the Grant Ck. and Town Ck. WW TP's flow into a single
larger flow which discharges into the Yadkin River (12.5 MGD). The City plans to
install a diffuser along the river bottom to increase mixing.
Phase III: Abandon both Grants Ck. and Town Ck. WWTPs and build a new 20 MGD WWTP
(NC0082279) which has nutrient removal capabilities. Nutrient removal is important
to the Town because they are expecting limits on N and P given the eutrophication
problems in High Rock Lake.
Special Schedule Requirements and additional comments from Reviewers:
Recommended by:
Reviewed by
Instream Assessment:
Regional Supervisor:
Permits & Engineering
VAM�ArJFAL�Ah� WAWA
7 7 9J
Date: - s
Date:
k1i �7 i
AUG 10 19 5
RETURN TO TECHNICAL SUPPORT BY:
=0
GvwI 4 44A %, -774,4) If � Wr-k ! iAJ l r ' j 1-At4'1,AfG -4 Pl roles

2
Existing Limits:
Wasteflow (MGD):
BOD5 (mg/1):
NH3N (mg/1):
DO (mg/1):
TSS (mg/1):
Fecal Col. V100 ml):
pH (SU):
Residual Chlorine (µg/l):
Oil and grease (mg/L)
TP (mg/1):
TN (mg/1):
CONVENTIONAL PARAMETERS
Monthly Average
Town Ck.
WWTP
Summer
Winter
5.0
5.0
10.0
20.0
3.0
6.0
5.0*
5.0*
30.0
30.0
200.0
200.0
6.0-9.0
6.0-9.0
monitor
monitor
Monthly Average
Grants Ck.
WWTP
Summer
Winter
7.5
7.5
15.0
30.0
6:0
12.0
5.0*
5.0*
30.0
30.0
200.0
200.0
6.0-9.0
6.0-9.0
monitor
monitor
monitor monitor monitor monitor
monitor monitor monitor monitor
* The daily avg. D.O. effluent concentration shall not be less than 5.0 mg/L
Recommended Limits:
Wasteflow (MGD):
BOD5 (mg/1):
NH3N (mg/1):
DO (mg/1):
TSS (mg/1):
Fecal Col. (/100 ml):
pH (SU):
Residual Chlorine (µg/l):
Oil and Grease (mg/1):
TP (mg/1):
TN (mg/1):
Limit changes due to:
Ifor. noa--1AZIM IUIU'
Summer Winter
5.0
5.0
10.0
20.0
3.0
6.0
5.0*
5.0*
30.0
30.0
200.0
200.0
6.0-9.0
6.0-9.0
monitor
monitor
ants .Ck
Summer
Winter
7.5
7.5
15.0
30.0
6.0
12.0
5.0*
5.0*
30.0
30.0
200.0
200.0
6.0-9.0
6.0-9.0
monitor
monitor
Grants Ck.(combined flow
Summer
Winter
12.5
12.5
15:0
30.0
6.0
12.0'
5'.0*
5.0*
30.0
30.0
200.0
200.0
6.0-9.0
6.0-9.0
monitor-
-monitor
monitor monitor monitor monitor monitor monitor
monitor monitor monitor monitor monitor monitor
(explanation of any modifications to past modeling analysis including new flows, rates, field data,
interacting discharges)
No changes in the limits with the exception of wasteflow. Limits based on modeling analysis
conducted by Betsy Johnson and Michelle Wilson.
(See page 4 for miscellaneous and special conditions, if applicable)

91
TOXICS/METALS
Type of Toxicity Test: Chronic, quarterly
Existing Limit: 67% Chronic (Ceriodaphnia) P/F
Recommended Limit: 10%
Monitoring Schedule: March, June, September, December
Existing Limits
Town Ck. WWTP
Grants Ck. WWTP
Daily Max. WQ or EL
aily Max. WQ or EL
Flow (MGD)
5.0
.5
Lead (u ):
30
WQ
7.0
Q
hromium (u ):
CMFCluoride
9
5.0
Q
erc (u ):
orator
.018
Q
(m )
onitor
.7
Q
o er (u ):
onitor
onitor
Nickel (u ):
104
WQ
momtor
inc (u ):
morutor
monitor
snide (u ):
3.6 *
Q
onitor
uminum (u ):
onitor
dmium
.9 *
Q
onitor
Chlorides (m )
monitor
S (m )
monitor
Toluene (u )
monitor
Silver (u ):
Imonitor
* Effective 4/1/97
Recommended Limits
Grants Ck. WWTP
Grants Ck. (combined flow)
Daily Max. W or EL
aily Max. WQ or EL
Flow (MGD)
5
12.5
Lead (u ):
7.0
Q
TMP
hromium (u ):
CMFCNly
5.0
Q
TMP
erc (u ):
.018
Q
.120
Q
uoride (mg)
.7
Q
o er (u ):
onitor
onitor
ickel (u ):
onitor
TMP
c (u ):
onitor
TMP
snide (u ):
onitor
0
Q
uminum (u ):
onitor
TMP
drr'u
onitor
0
Q
hlorides )
onitor
S (mg)
onitor
onitor
oluene (u )
onitor
Silver (u ):
monitor
monitor
etrachloroeth lene
monitor
� � (5e2 n2zf5hCet)

Limits changes due to:
No lead, chromium, or fluoride limits are required because the predicted maximum concentrations
are below the allowable. Nickel, zinc, and aluminum monitoring are no longer required because
predicted concentrations are well below the allowable. Cyanide and cadmium limits are necessary
however given that the predicted maximum concentrations are considerably greater than the
allowable. DMR data does not indicate that chloride and toluene are a problem therefore
monitoring for these two compounds is no longer recommended. Monitoring for
tetrachloroethylene is recommended because the latest APAM (1993) reports a concentration within-
0.1 ug/L of the instream standard for water supplies.
An APAM requirement is recommended for this facility. Salisbury has an organic
chemical manufacturer, National Starch and Chemical Company (NSCC), which appears to be a
high risk for discharging a variety of organic chemicals to the treatment plant. NSCC is permitted
to discharge 325,000 gpd of organic chemical manufacturing wastewater and groundwater
remediation wastewater to the Grants Creek VWVTP. NSCC has an environmental non-compliance
history related to pretreatment and hazardous waste marking/storage. In January 1994 Grants Ck.
WWTP experienced a process upset which the City believes NSCC may have been responsible
for. In addition, the State last year fined NSCC $590,000 for violating hazardous waste
management laws. f y4 fit a4k) jb� J) _j C BnUJ K Gvr '�k 4d h�tCyctii re A4,V4
Parameters) are water quality limited For some parameters, the available load capacity of
the immediate receiving water will be consumed. This may affect future water quality based
effluent limitations for additional dischargers within this portion of the watershed.
•V
No parameters are water quality limited, but this discharge may affect future allocations.

W1
14 l
INSTREAM MONITORING REQUIREMENTS is is A ova
� � ,�lGe✓ .fig � � !.�
Upstream Location: * 200 ft. upstream from diffuser outal
Downstream Location: Yadkin River at the Town o Yadkin or 0.7 miles upstream of the railroad brig e
(see attached map)
Parameters: Temperature, DO, Fecal, Conductivity, Turbidity
Special instream monitoring locations or monitoring frequencies:
at downstream site: Jun. -Sep (1/wk) TP, PO4, TKN, NH3N, NOx, Chl-A
MISCELLANEOUS INFORMATION & SPECIAL CONDITIONS
Adequacy of Existing Treatment
Has the facility demonstrated the ability to meet the proposed new limits with existing treatment
facilities? Yes No
If no, which parameters cannot be met?
Would a "phasing in" of the new limits be appropriate? Yes No
If yes, please provide a schedule (and basis for that schedule) with the regional
office recommendations:
If no, why not?
Special Instructions or Conditions
Wasteload sent to EPA? (Major) (Y or N)
(If yes, then attach schematic, toxics spreadsheet, copy of model, or, if not modeled, then old
assumptions that were made, and description of how it fits into basinwide plan)
Additional Information attached? (Y or N) If yes, explain with attachments.

l/ � / l # N0ORM
Facility Name (.� Yl�l�l Cr�;P/1 �//%i/71� Permit Pipe # 00/
CHRONIC TOXICITY PASS/FAIL PERMIT LIMIT (QRTRLY)
_ The effluent discharge shall at no time exhibit chronic toxicity using test procedures outlined in:
1.) The North Carolina Ceriodaphnia chronic effluent bioassay procedure (North Carolina Chronic Bioassay
Procedure - Revised *September 1989) or subsequent versions.
The effluent concentration at which there may be no observable inhibition of reproduction or significant mortality
7 is ff % (defined as treatment two in the North Carolina procedure document). The permit holder shall perform
qlquart :a monitoring using this procedure to establish compliance with the permit condition. The first test will be
performed after thirty days from the effective date of this permit during the months of
c .. J" .0ee em Z, . Effluent sampling for this testing shall be performed at the NPDES
permitted final effluent discharge below all treatment processes.
All toxicity testing results required as part of this permit condition will be entered on the Effluent Discharge
Monitoring Form (MR-1) for the month in which it was performed, using the parameter code TGP3B.
Additionally, DEM Form AT-1 (original) is to be sent to the following address:
Attention: Environmental Sciences Branch
North Carolina Division of
Environmental Management
4401 Reedy Creek Road
Raleigh, N.C. 27607
Test data shall be complete and accurate and include all supporting chemical/physical measurements performed in
association with the toxicity tests, as well as all dose/response data. Total residual chlorine of the effluent toxicity
sample must be measured and reported if chlorine is employed for disinfection of the waste stream.
Should any single quarterly monitoring indicate a failure to meet specified limits, then monthly monitoring will
begin immediately until such time that a single test is passed. Upon passing, this monthly test requirement will
revert to quarterly in the months specified above.
Should any test data from this monitoring requirement or tests performed by the North Carolina Division of
Environmental Management 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 and appropriate environmental controls, shall constitute an invalid test and will require immediate
retesting(within 30 days of initial monitoring event). Failure to submit suitable test results will constitute
noncompliance with monitoring requirements.
7Q 10 b 3 cfs
Permitted Flow /a , 3_ MGD
1WC & • 2 %
Basin & Sub -basin 03 - 4 7 - 0 Ll
Receiving Stream 5 k.,',- k2,'v e r
County Aowa_,n-
Recommended by:
QCL PIF Version 9/91

Facility Name CfS �a �s Cr e-e- L w YTIO Permit # /!/G 0 D Pipe #
CHRONIC TOXICITY PASSIFAIL PERMIT LIMIT (QRTRLY)
Jbe effluent discharge shall at no time exhibit chronic toxicity using test procedures outlined in:
1.) The North Carolina eri hnia chronic effluent bioassay procedure (North Carolina Chronic Bioassay
Procedure - Revised *September 1989) or subsequent versions.
The effluent concentration at which there may be no observable inhibition of r0r6duction or significant mortality
is /0 % (defined as treatment two in the North Carolina procedure document). The permit holder shall perform
quarterly monitoring us' this procedure to establish compliance with th ;init condition. The first test will be
performed after thirty day from the effective date of this permit during ,Ysonths of
m Tune �e c r . Effluent sampling for this tes shall be performed at the NPDES
permitted final effluent disch ge below all treatment processes.
l
All toxicity testing results required as part of this permit condition will entered on the Effluent Discharge
Monitoring Form (MR-1) for the month in which it was performed, ppsing the parameter code TGP3B.
Additionally, DEM Form AT-1 (original) is to be sent to the follo /! g address:
Attention: Environmental Sciencesiranch
North Carolina Divisi96 of
Environmental Manz ement
4401 Reedy Creek oad
Raleigh, N.C. 27 7
Test data shall be complete and accurate and include a itipporting chemical/physical measurements performed in
association with the toxicity tests, as well as all dose%sponse data. Total residual chlorine of the effluent toxicity
sample must be measured and reported if chlorine is employed for disinfection of the waste stream.
Y;
Should any single quarterly monitoring indicate a,-Wure to meet specified limits, then monthly monitoring will
begin immediately until such time that a single test i passed. Upon passing, this monthly test requirement will
revert to quarterly in the months specified above.
Should any test data from this monitoring requirement o%tests performed by the North Carolina Division of
Environmental Management indicate poten "al impacts to e receiving stream, this permit may be re -opened and
ti
modified to include alternate monitoring uirements or limits.
NOTE: Failure to achieve test condition, as specified in the cited document, such as minimum control organism
survival and appropriate environmental controls, shall constitute an invalid test and will require immediate
retesting(,Azthin 30 days of initial monitoring event). Failure to s�ibmit suitable test results will constitute
noncompliance with monitoring req . rnents. \
7Q10 / 7�, cfs
Permitted Flow / z.s` MGD
IWC /O %
Basin & Sub -basin 03- 07-o
Receiving Stream Ya k-;A d ver
County Roulall
QCL P/F Version 9191
Recommended by:
Date ?I 7, 9�
o`er
vim. aNM I

i 7 NP✓
SALISBURY QUADRANGLE
NORTH CAROLINA
7.5 MINUTE SERIES (I"OPOGRAPHIC)
WINSTON-SALEM 31 MI.
552 25' ! 553 554 CHURCHLAND 'IZ.8 Mil. 1 590 000 FEET 1 1556 80.32
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. r
Drainage Area (D.A.) and Average Flow
Calculations for Grants Creek WWTP
v Outfall to the Yadkin River
June 28, 1995
AHM
• This calculation pertains to the 12.5 MGD outfall which combines the flow from the
Grants Ck. and Town Ck. WWTPs.
D.A. and Avg. Flow (Qavg) at the mouth of Grants Ck. = 67.4 mi2 * and 81 cfs *
D.A. and Qavg at US-29 near Salisbury, NC = 3452 mi2 * and 4960 cfs *
D.A. between US-29 and the outfall location NOT including Grants Ck. D.A. = 7.4 mi2 **
• D.A.. at the outfall location = 3452 - (67.4+7.4) = 3377 mil
• Approximate Qavg at the outfall location = 4960 - 81 = 4879 cfs
71
* D.A. and Qavg obtained from USGS printouts
** D.A. obtained using topo maps and planimeter

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i .� ` - n

Calculating Effective 7Q10 Flows Based on Dilution
7/5/95
AHM
To improve milting between the effluent and the Yadkin River the City of Salisbury plans
to construct a diffuser with a minimum 10:1 dilution ratio. Therefore, the instream waste
concentration (IWC) at the diffuser is assumed to be 10%. Given this information the
effective 7Q10 flow can be back calculated as follows:
By definition,
Dilution =1 / IWC = 1 / 0.10 = 10
and
IWC = Qw / (Qw + 7Q10)
where: Qw = wastewater flow (cfs) = 12.5 MGD * 1.55 = 19.375 cfs
7Q10 = design flow (cfs)
substituting,
Dilution = (Qw + 7Q10) / Qw
rearranging,
7Q10 = (Dilution * Qw) - Qw
7Q10 = Qw * (Dilution - 1)
7Q10 = 19.375 cfs * (10 - 1) = 174 cfs
c 10 %
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l

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ANALYSIS OF PROPOSED
YADKIN RIVER OUTFALL
CITY OF SALISBURY
♦ Objective: predict mixing and develop effluent limits for
alternative outfall designs
♦ Model: Cornell Mixing Zone Expert System (CORMIX)
• predicts dilution characteristics and plume geometry
in receiving waters
• developed at hydraulics laboratory, Cornell SCEE
. EPA supported
• three subsystems:
submerged single port outfall
submerged multiport outfall
surface discharge
. version 2.10
♦ Discharge conditions:
. 20 MGD (.876 m3/s) and 12.5 MGD (.548 m3/s)
• negatively buoyant effluent
• at new location, line must cross channel to reach
point of discharge

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DIFFUSER DESIGN OPTIONS
♦ Diffuser design: based on information submitted by
Peirson and Whitman
♦ Multiport diffuser:
• single line with 3 ports
• diffuser length = 7 m
• diffuser type = unidirectional perpendicular
• nozzles oriented downstream, 45' discharge
• port diameter = 14 inches (.356 m)
• discharge height = 2.5 ft (.76 m)
♦ Single pipe: 24 inch diameter (.61 m)
♦ Same channel location used for both options

AMBIENT AND DESIGN CONDITIONS
Combination of riverine and lacustrine conditions
7Q10 = 1030 cfs (29.1 m3/s)
Depth is controlled by dam operation
Target water level: within 5 ft of full pool
(May 15 - September 15)
Two critical condition scenarios were evaluated:
• 7Q10 at full pool
. 7Q10 at 5 ft below full pool
Full pool scenario used to develop toxics limits ,---
Mixing zone criteria:
• mixing zone not to exceed 1/3 of channel width
• standards must be, met at edge of mixing zone
• toxics limits based on dilution at edge of mixing zone

DISCHARGE VELOCITIES
(3 ports at 20 MGD)
port diameter velocity
(inches) (meters) (m/s)
10 .254 5.76
12 .305 3.99
14 .356 2.93
15 .381 2.56

Cross-section at Proposed Discharge Site: Full Pool
10
8
t 6
C. 4 8 ft
N 2
.0
0 M LO r` O• M 0 r\ O• M 0 r`N _ )�MMM ccI_q r _ M � 1_0
clo !o 0%01 r\
width (x 1Off)
'vertical scale exaggerated
Site data for full pool, discharge . 1030 cfs (29.1 m3/s)
actual channel schematic
width 700 ft (213.4 m) width 490 ft (149.4 m)
mean depth 6.5 ft (1.98 m) depth 8 ft (2.44 m)
max depth 10 ft (3.05 m) xsectional area 3920 sq ft
xsectional area 4575 sq ft velocity .262 ft/s (.0798 m/s)
Discharge location: 46.2 m from left bank

Cross-section at Proposed Discharge Site: 5 Feet Below Full Pool
10 • 8 330 feet
t 6
4
N 2 4 feet
0 _ pp., _ _ _ _ cMv� t� _
�-- ch f\ O` .-- - - - O N N N N N ch c� c2 c � � ^d' PV L 1O �O '0 % r .
width (x 10 ff)
'vertical scale exaggerated
Site data for 5 It below full pool, discharge . 1030 cfs (29.1 m/s)
actual channel schematic
width 540 ff 064.6 m) width 330 ff (100.6 m)
neap depth 2.4 ff (.73 m) depth 4 ff (1.22 m)
nax depth 5 ff 0.52 m) xsectional area 1320 sq ff
(sectional area 1320 sq ff velocity .778 ff/s (.2371 m/s)
Discharge location: 45.7 m from left bank

Salisbury Yadkin River Outfall:
Plume width W for single and multiport diffuser, 20 mgd at
full pool and 7Q10
60
left bank
20
i
E
0-EEE
J
-20
5\0 100
150 200 250 300 350
-
u-40
' �-
- - _ -
three port diffuser
-60
-.�
°
-�
single 1p
g. pipe
d
----
-100
-'` right bank
-120
distance down river (m)
Site data for full pool, discharge n 1030 cts (29.1 m3/s)
actual channel schematic
Idth
700 ft (213.4 m)
width
490 ft 049.4 m)
lean depth
6.5 ft (1.98 m)
depth
8 ft (2.44 m)
iax depth
10 ft (3.05 m)
xsectional area
3920 sq ft
sectional area
4575 sq ft
velocity
.262 ft/s (.0798 m/s
December,1995
Dilution
distance
3 port
single
downriver
(m)
3.5
6.7:1
16.75
2.2:1
31.3
2.3:1
45.8
2.4:1
55.3
14.5:1
65.7
15.5:1-
80.5
2.5:1
107
19.3:1
149.7
2.7:1
159
23.2:1
218.9
2.9:1
314.6
32.1
3.2:1
bold: plume width =1 /3 channel width
(49.8 m)
vuttau•
single port: 24" diameter
exit veloc=2.99 m/s
3 port: 14" diameter, 7 m long
exit veloc=2.93 m/s

Salisbury Yadkin River Outfall:
Plume width (m) for single and multiport diffuser, 20 mgd at 5
ft below full pool and MO
40 i . left bank
o i
•• 0
d
F _ - ; 60 100 150 200 250 300 350 400 450 500
.,ate -20 _
%
-40 thre port �— single pipe
ciiffiser `�- - ` _ - - _ _ _ right bank
-60 distance down river (m)
Site data for 5 ft below full pool, discharge = 1030 cfs (29.1 m/s)
actual channel schematic
width
540 ft 064.6 m)
width
330 ft (100.6 m)
mean depth
2.4 ft (.73 m)
depth
4 ft (1.22 m)
max depth
5 ft (1.52 m)
xsectional area
1320 sq ft
xsectional area
1320 sq ft
velocity
.778 ff s (.2371 m/s)
December,1995
distance
3 port
single
downriver
(m)
3.1
1.8:1
3.5
5.3:1
16
6.8:1
28.8
8.1:1
42
9.1:1
2.5:1
52.6,
2.8:1
62.4
10.7:1
81
11.9:1
3.4:1 .
122
15.0:1
- -- -4.6:1 _
159
18.2:1
6.3:1
199
22.7:1
8.5:1
240
27.8:1
11.3:1
330
20.3:1
432
32.4:1
493
33.2:1
bold: plume width =1 /3 channel width
(33.5 m)
Outfall:
single port: 24 " diameter
exit veloc=2.99 m/s
3 port: 14" diameter, 7m long
exit velo.c= 2.93 m/s

TOXICS LIMITS
SALISBURY YADKIN RIVER OUTFACE*
Dilution
IWC for Toxicity Test
Limits (µg/l):
Cadmium
Chromium
Nickel
Cyanide
Copper
Zinc
Lead
Silver
Mercury
Toluene
Fluoride
20 MGD Discharge
2.2:1
45%
4.4
M
55.0
11.0
M
M
55.0
M
0.03
24.2
M
15.5:1•
M
M
M
77.5 -
M
M
M
M
0.19
M
12.5 MGD Discharge
sin le
2.9:1
34%
5.8
M
M
14.5
M
M
72.5
M
0.03
31.9
M
* Design conditions: fullpool, 7Q10, plume width = 1/3 channel width
M = monitor unless in LTMP
1
�5 too)-16 'I")
3 port diffuser
14.6:1
7%
M
M
73.0
M
M
M
M
0.17
M
12-14-95

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TOXICANT ANALYSIS
monlyor
Facility Name
;Grant Ck. (+Town Ck.
NPDES #
': NCO023884
Qw (MGD)
i _ _20
37.2
7Q10s 61s
1WC (%)
45.45
Reeving Stream
Stream Class
••Yadkin River
WS-V
FINAL RESULTS
Cadmium
LIMIT
Max. Pred Cw
;' 6:628254305
Allowable. Cw
4.4
Chromium
OK I
Max. Pred Cw
13.2
Allowable Cw
110.0
Nickel
LIMIT
Max. Pred Cw
63.94999061
Allowable Cw
55.0
Cyanide
LIMIT
Max. Pred Cw
277.0311648
Allowable Cw
11.0
Copper
MONITOR -
Max. Pred Cw
220.4583193
Allowable Cw
15.4
Zinc
MONITOR
Max. Pred Cw
1036.04971
Allowable Cw
110.0
Lead
LIMIT
Max. Pred Cw
93.67
Allowable Cw
55.0
Arsenic
#DIV/01
Max. Pred Cw
#DIV/01
Allowable Cw
110.0
Silver
MONITOR
Max. Pred Cw
22.49397638
Allowable Cw
0.1
Mercury
LIMIT
Max. Pred Cw
4.2
Allowable Cw
0, 0 a& 0.0
Toluene
LIMIT
Max. Pred Cw
122.0933685
Allowable Cw
Floride
OK 1
Max. Pred Cw
2063.268221
Allowable Cw
3960.0
12/14/95 PAGE'

12/13/95
AHM
Calculating Effective 7010 Flows Based on Dilution
Facility: Proposed WWTP
Permit No.:
Comments: This work sheet is for a Qw=20 MGD and no diffuser.
To improve mixing between the effluent and the iYadldn River the Town of Salisbu plans to construct a diffuser
with a minimum 2.20 Ito 1 dilution ratio.
Therefore, the instream waste concentration (IWC) at the diffuser is = 45.45 %
Given this information the effective 7010 flow can be back calculated as followed:
By definition: Dilution=l/IWC=2.2 and IWC=Qw/(Qw + 7010)
where: Qw=wastewater flow (cfs)= MGD which 31.00 cfs
7010 = design flow in Over (cfs)
Substituting,
Dilution = (Qw + 7Q10) / Qw
Rearranging,
7Q10 = (Dilution ' Qw) / Qw
7Q10 = Qw ' (Dilution - 1)
7510 = 37.2 cfs
Page 1

TOXICANT ANALYSIS
lmdn / for -- 4
/we'7/'Y'or --— ->
ho ovm fof
Facility Name
;Grant Ck. (+Town Ck.
NPDES #
': NC0023884
Qw(MGD)
i20
_„_.._.._.._.._.
•. 449.5
7Q10s cfs
/WC (%)
6.45
Reeving Stream
Stream Class
:Yadkin River
WS-V
FINAL RESULTS
Cadmium
OK I
Max. Pred Cw
6.628254305
Allowable Cw
31.0
Chromium
OK I
Max. Pred Cw
13.2
Allowable Cw
775.0
Nickel
OK I
Max. Prod Cw
63.94999061
Allowable Cw
387.5
'Cyanide
LIMIT
Max. Pred Cw
277.0311648
Allowable Cw
77.5
Copper
MONITOR
Max. Pred Cw
220.4583193
Allowable Cw
108.5
Zinc
MONITOR
Max. Pred Cw
1036.04971
Allowable Cw
775.0
Lead
OK 1
Max. Pred Cw
93.67
Allowable Cw
387.5
Arsenic
#DIV/01
Max. Pred Cw
#DIV/01
Allowable Cw
775.0
Silver
MONITOR
Max. Pred Cw
22.49397638
Allowable Cw
0.9
Mercury
LIMIT
Max. Pred Cw
4.2
Allowable Cw
0.2
Toluene
LIMIT
Max. Pred Cw
122.0933685
Allowable Cw
/ 70. 50
Floride
OK I
Max. Pred Cw
2063.268221
Allowable Cw
27900.0
s��sfa�� Woe/ lvr 5-d
,hood' d� // 0 141/L
12/14/95 PAGE .

Calculating Effective 7010 Flows Based on Dilution
Facility: Proposed WWTP
Permit No.:
Comments: This work sheet is for a Qw=20 MGD with a diffuser.
improve mixing between the effluent and the ;Yadlan Rlver the Town of Salisbur r� plans to construct a diffuser
i a minimum 1 15.50 Ito 1 dilution ratio.
arefore, the instream waste concentration (IWC) at the diffuser is = 6.45 %
,en this information the effective 7Q10 flow can be back calculated as followed:
By definition: Dilution=lAWC=15.5 and IWC=Qw/(Qw + 71010)
.._.._.._..-- - - -
where: Qw--wastewater flow (cfs)= i 20 MGD which = 31.00 cfs
7Q10 = design flow in river (cfs)
Substituting,
Dilution = (Qw +' 7Q10) / Qw
Rearranging,
7Q10 = (Dilution ` Qw) / Qw
7Q10 = Qw • (Dilution - 1)
7Q10 = 449.5 cfs
12/13/95
AHM
Page 1

J
QW:Z, /Z S
TOXICANT ANALYSIS
/10 MOM)lor —�
Inenivr --�
,Won,,f Or -->
(0, l 7111L
Facility Name
;Grant Ck. +Town Ck.
NPDES #
' NCO023884
Qw (MGD)
i 12.5
263.5
7Q10s cfs
/WC (%)
6.85
Rec'ving Stream
Stream Class
•. Yadkin River
i WS-V
FINAL RESULTS
Cadmium
OK 1
Max. Pred Cw
6.628254305
Allowable Cw
29.2
Chromium
OK I
Max. Pred Cw
13.2
Allowable Cw
730.0
Nickel
OK I
Max. Pred Cw
63.94999061
Allowable Cw
365.0
Cyanide
LIMIT
Max. Pred Cw
277.0311648
Allowable Cw
73.0
Copper
MONITOR
Max. Pred Cw
220.4583193
Allowable Cw
102.2
Zinc
MONITOR
Max. Pred Cw
1036.04971
Allowable Cw
730.0
Lead
OK 1
Max. Pred Cw
93.67
Allowable Cw
365.0
Arsenic
#DIV/01 No olaf,-,
Max. Pred Cw
#DIV/01
Allowable Cw
730.0
Silver
MONITOR
Max. Pred Cw
22.49397638
Allowable Cw
0.9
Mercury
LIMIT
Max. Pred Cw
4.2
Allowable Cw
o. i 75Z -- 0.2
Toluene
LIMIT
Max. Pred Cw
122.0933685
Allowable Cw
/6,g, 6 ---.
Floride
OK 1
Max. Pred Cw
2063.268221
Allowable Cwl
26280.0
12/14/95 PAGE'

Calculating Effective 7010 Flows Based on Dilution
Facility:Grants Ck. WWTP
Permit No.:NC0023884
Comments: This work sheet is for a Qw=12.5 MGD with a diffuser.
improve mixing between the effluent and the iYadkin River i the Town of Salisbu plans to construct a diffuser
i a minimum 14.60 Ito 1 dilution ratio.
:refore, the instream waste concentration (IWC) at the diffuser is = 6.85 %
an this information the effective 7Q10 flow can be back calculated as followed:
By definition: Dilution=l/IWC=14.6 and IWC=Qw/(Qw + 7Q1.0)
where: Qw=wastewater flow (cfs)= i.12.5 MGD which = 19.38 cfs
7Q10 = design flow in river (cfs)
Substituting,
Dilution = (Qw + 7Q10) / Qw
Rearranging,
7Q10 = (Dilution ` Qw) / Qw
7Q10 = Qw ` (Dilution - 1)
7Q10 = 263.5 cfs
12/13/95
AHM
Page 1

Nc
ro No
TOXICANT ANALYSIS
boroledin,z /
%�'IOi9tfTl✓' i
Facility Name
;Grant Ck. (+Town Ck.
NPDES #
': NCO023884
Qw (MGD)
i 12.5
I 36.8
7010s cfs
/WC (%)
34.49
Rec'ving Stream
Stream Class
•.Yadkin River
i WS-V
FINAL RESULTS
Cadmium
LIMIT
Max. Pred Cw
6.628254305
Allowable Cw
6.8
Chromium
OK I
Max. Pred Cw
13.2
Allowable Cw
145.0
Nickel
OK I
Max. Pred Cw
63.94999061
Allowable Cw
72.5
Cyanide
LIMIT
Max. Pred Cw
277.0311648
Allowable Cw
14.5
Copper
MONITOR
Max. Pred Cw
220.4583193
Allowable Cw
20.3
Zinc
MONITOR
Max. Pred Cw
1036.04971
Allowable Cw
145.0
Lead
LIMIT
Max. Pred Cw
93.67
Allowable Cw
72.5
Arsenic
#DIV/01
Max. Pred Cw
#DIV/01
Allowable Cw
145.0
Silver
MONITOR
Max. Pred Cw
22.49397638
Allowable Cw
0.2
Mercury
LIMIT
Max. Pred Cw
4.2
Allowable Cw
0 8 3 yx --;> 0.0
Toluene
LIMIT
Max. Pred Cw
122.0933685
Allowable Cw
3 /.
Floride
OK I
Max. Pred Cw
2063.268221
Allowable Cw
5218.8
12/14/95 PAGE "

Calculating Effective 7010 Flows Based on Dilution
Fa6111ty:Grants Ck. WWTP
Permit No.:NC0023884
Comments: This work sheet is for a Qw=12.5 MGD and no diffuser.
To improve mixing between the effluent and the iYadkln River i the Town of Ilsbu plans to construct a diffuser
with a minimum 1 2.90 Ito 1 dilution ratio.
Therefore, the instream waste concentration (IWC) at the diffuser is = 34.48 %
Given this information the effective 7010 flow can be back calculated as followed:
By definition: Dilution=l/IWC=2.9 and IWC=Qw/(Qw + MO)
where: Qw=wastewater flow (cfs)= 1 MGD which = 19.38 cfs
MO = design flow in river (cfs)
Substituting,
Dilution = (Qw + 7Q10) / Qw
Rearranging,
7Q10 = (Dilution ' Qw) / Qw
7Q1O = Qw(Dilution - 1)
7Q10 = 3 6. 8 cfs
12/13/96
AHM
M
Page 1

{ror�
1993-1 PS�f�ru &�) PAW data
TOXICANT ANALYSIS
I
fw
Facility Name
NPDES #
Ow MGD
7010s cfs
/ WC %
RecVing Stream
Stream Class
Grants Ck. WWTP
NC0023884 _
_.._.._..___.._
....................... _ 36.8
34.5_
Yadkin_ _River
____ _ _ _
WS-V
FINAL RESULTS
Cadmium
LIMIT
Max. Pred Cw
6.628254305
Allowable Cw
5.8
Chromium
OK I
Max. Pred Cw
13.2
Allowable Cw
145.0
Nickel
OK 1
Max. Pred Cw
33.37013041
Allowable Cw
72.5
Cyanide .
LIMIT
Max. Pred Cw
277.0311648
Allowable Cw
14.5
Copper
MONITOR
Max. Pred Cw
220.4583193
Allowable Cw
20.3
Zinc
MONITOR
Max. Pred Cw
246.5174032
Allowable Cw
145.0
Lead
OK 1
Max. Pred Cw
52.35
Allowable Cw
72.5
Arsenic
#DIV/01
Max. Pred Cw
#DIV/0!
Allowable Cw
145.0
Silver `+,
MONITOR
Max. Pred Cw
22.49397638
Allowable Cw
0.2
MercuryA
LIMIT
Max. Pred Cw
4.2
Allowable Cw
0.034792
Based on 1993-1995 (thru Oct)
Grants CL WWTP DMR data
12/13/95 AX. /If(Gd
0441A lac. G1,1)
1z2.09"/L
A 0.�/G
PAGE'

TOXICANT ANALYSIS
Cackdum
I Parameter.
IChmduni
I
2
IL94
Donlfn tto
check vdth PS?andaud=
sumall
I
I
I
n
BDL=172DL
Actual Data
RESULTS
n
8DL.1/2DL
Actual Data
RESULTS
1
0.25
<oS
Sid Devm
OA10115124
1
2.5
<5
Sid Da.
1.776
2
2.5
<5
Mean
0.35625
2
2e5
<5
Mean
3.884
3
0.5
<1
C.V.
1.15130172
a
2.5
<5
C.V.
0A8
4
0.5
<1
4
2.5
<5
5
0.5
<1
5
2.5
<6
6
0*5
<1
Mu1fFwtar=
2.7
6
868
8.8
hfuftFwtr='
1.2
7
0.13,
0.13
maxvaw
2.5
7
5
5
Max Value
11
8
0.2
0.2
IMax Pied CV4
8.62B25431
at
5
5
Max Red Qv.
13.2
tWA
9
75
lAlkwable ON
5.8
91
5
5
Womble Ow
145.
10
0.27
0.27
101
5
<10
11
0.3
0.3
11
5
<10
12
0.9
0.9
Linear kilemolallon
of Mull
12
5
<10
I-Inear Intairool. of MF
13
1
1
13
5
<10
14
0.25
<.5
C.V.
1.151301721
1;
5
<10
C.V.
0-46
is
0.25
<.5
C.V. to
1.11
15
6
<l 0
C.V. to
A
6
0.15
<.3
C. V. id
1.2
16
5
<10
Cm V. hl
0.5
17
0.5
<1
MFW
17
5
<10
MFW
18
0.25
<.5
M Ro
2.6t
is
5
<l
MR.
1.2
10
0.1
4.2
MF--
2.7
19.
5
<10
M F--
1.2
20
0.05
a.11
20
5
<10
21
381
21
5
<10
22
0.1
<0.2
22
5
<10
23
0.2
0.2
23
2.34
2*34
24
0.2
02
24
5.51
5.51
25
0.1
OA
25
3.45
3.45
28
0.3
0.13
26
3086
3466
27
oms
02
27
2.8
2.81
28
US
c0.31
111
1 281
3.44
3.44
29
0w2
0.2
29
2.7
2.7
30
0.1
.0.2
30
3.35
3.35
311
0.1r.0.2
31
4.26
C28
32
0.1
�o.2
32
3.43
3.43
33
0A
<0.2
33
3.80
3.89
34
0.1
�0.2
34
3.75
3.75
35
0.1
.0.2
-
35
3.45
3.45
as
0.1
�0.2
so
4.1
4.1
37
011
.0.2
1 371
6.15
6.15I
38
0.5
38
39
0.5
<1
39
3.98
3.98
40
0.5
<1
40
1.25
<2.5
41
0.5
<1
41
1.25
<2.5
42
0.5
.1
42
1.25
<2.5
43
43
1.25
<2m5
44
44
1.25
<2.5
45
45
1.25
<2.5
48
46
1.25
<2.5
47
47,
3.28
3.281
48
48
4.38
4.38
49
49
2.63
2.63
60
so
4.8
4.8
61
51
2.B
2.8
52
52
3.3
3*3
53
63
3.8
3.8
54
54
1.25
<2m5
55
1
55
1.25
<2.5
56
561
1.251
<2.5
57
67
1.25
<2.5
so
58
1.25
<2.5
59
59
3.93
3.63
Sol
60
0.8
0.8
at
61
1m6
1.6
62
62
2.1
2.1
63
63
25
2.5
64
64
2.8
268
65
65
4.1
4.1.
68
681
3.2
32
67
67
2.6
2.0
68
68
2.5
<s
69
69
2.5
b
70
70
2.5
.5
71
1
71
2.5
<5
..
72
72
2.5
<6
73
73
2.5
<5
74
74
2.5
.5
75
-
78
761
6
6A
T7
7
4
76
76
6.11
79
1
70
1 2.31
2.31
12i13195 PAGE*

TOXICANT ANALYSIS
12/13195 PAGE:

TOXICANT ANALYSIS
12/13/95
=
Nickel
rameter=
Cyanide
_.._.._..5
Standard=
n
BDL=1/2DL
Actual Data
RESULTS
n
BDL=1/2DL
Actual Data
RESULTS
1
16
16
Std Dev.
3.662
1
2.5
<5
Std Dev.
2
16
16
Mean
4.93
{ 2
7
7
Mean
3
16
16
C.V.
0.743
3
2.5
<5
C.V.
4
7
7
4
2.5
<5
5
8
8
5
2.5
<5
6
7
7
MuRFador=
2.1
6
2.5
<5
MultFador=
7
8
8
Max. Value
161
2.5
<5
Max. Value
8
3
3
Max. Pred Cw
33.37
ggA 8
5
<10
Max. Pred Cw
9
2.5
<5
Allowable Cw
72.5
9
5
<10
Allowable Cw
10
2.5
<5
10
10
10
11
6
6
11
5
<10
12
3
3
Linear Interpol. of MF
12
6
6
Linear Into of
13
1.51
<3
13
2.5
<5
14
41
4
C.V.
0.743
14
2.5
<5
C.V.
15
2.51
<5
C.V. to
0.7
15
60
60
C.V.lo
16
2.51
<5
C. V. hi
0.8
16
2.5
<5
C. V. hi
17
2.5
<5
MFhi
2_.2
17
10
10
MFhi
18
2.5
<5
MFlo
_
_ 2
18
2.5
<5
MFlo
19
7
7
MP
2.1
19
2.5
<5
20
6
6
20
2.5
<5
21
5
5
21
31
31
22
3
3
22
9
9
23
5.11
5.1
23
8
8
24
6.11
6.1
24
30
30
25
41
4
<? 25
80
80
26
51
5
26
40
40
27
51
5
27
5
<10
28
41
4v'
28
5
<10
29
2
<4
29
5
<10
30
31
3
30
5
<10
31
21
2
31
5
<10
32
3
3
32
5
<10
33
3
3
33
5
<10
34
5
5
34
5
<10
35
6
6
35
5
<10
36
2.5
<5
36
5
<10
37
2.5
<5
37
2.5
<5
38
2.5
<5
"'`" 36
2.5
<5
39
2.5
<5
39
2.5
<5
40
2.5
<5
>.'3# 40
2.5
<5
41
411
2.5
<5
1.6629
3.5
80
277.03
PAGE'
r�

TOXICANT ANALYSIS
arameter=
C_oePer_ _
:?:;:Parameter
Zinc
Standard =
7
Standard =
50
/l
n
BDL=1/2DL
Actual Data
RESULTS
n
BDL=1/2DL
25
143
50
Actual Data
<50
143
<100
RESULTS
Std Dev.
Mean
C.V.
21.155
40.38
0.5239
1
25
<50
Std Dev.
19.3905
1
2
25
50
Mean
24.1
2
3
50
<100
C.V.
0.80458
3
4
50
<100
4
50
<100
51
50
<100
1
5
50
<100
6
50
<100
MultFactor=
2.2
6
50
<100
MultFactor =
1.7
7
9
9
Max. Value
100
g Cgon 7
38
38
Max. Value
143
8
10
10
Max. Prod Cw
220.458
8
32
32
Max. Pred Cw
246.517
9
.10
10
Allowable Cw
20.3
9
43
43
Allowable Cw
145.0
10
30
30
10
10
<20
ill
10
<20
1
11
40
40
12
100
<200
Linear Interpol. of MF
12
40
40
Linear Interpol. of MF
13
13
13
13
31
31
14
25
<50
C.V.
0.80458
14
29
29
C.V.
0.5239
15
25
<50
C.V. l0
0.8
15
32
32
C.V.Io
0.5
16
15
<30
C. V. hi
0.9
16
53
53
C. V. hi
0.6
17
25
<50
MFhl
2.3
17
25
<50
MFhi
! 1.8
18
25
<50
MFIo
2.2
18
25
<50
MFlo
1.7
19
23
23
MF=
2.2
19
52
52
MF=
1.7
20
19
19
X.i20
1
<2
21
34
34
21
39
39
22
16
16
22
281
28
23
20
20
23
33.4
33.4
24
22
22
24
44
44
25
14
14
25
44
32
32
44
32
32
26
18
18
26
27
18
18
27
28
10
10
28
24.8
24.8
29
12
12
29
24
25
24
25
30
12
12
30
31
17
17
31
20
20
32
1
<2
32
50
50
33
1
<2
33
50
50
34
4
4
34
63
63
35
11
11
35
37
37
36
5
<10
36
50
<100
37
50
<100
37
50
<100
38
50
<100
38
50
<100
X.
39
10
10
39
50
<100
40
50
<100
40
501
<100
41
41
42
42
431
43
12/13/95 PAGE'

TOXICANT ANALYSIS
rameter=
Lead
n
BDL=1/2DL
Actual Data
RESULTS
{
1
2.5
<5
Std Dev.
3.14445
2
2.5
<5
Mean
2.58369
3
2.5
<5
C.V.
1.21704
4
2.5
<5
5
2.5
<5
6
2.5
<5
MultFactor=
1.5
7
2.5
<5
Max. Value
34.9
8
2.5
<5
Max. Pred Cw
52.35
9
2.5
<5
Allowable Cw
72.5
10
5
<10
11
5
<10
12
5
<10
Linear Interpol. of MF
13
5
<10
14
5
<10
C.V.
1.21704
15
5
<10
C.V.I0
1.2
16
5
<10
C. V. hi
1.3
17
5
<10
MFhI
i 1.51_
18
5
<10
MFlo
_ _
! _ _ 1.5!
19
5
<10
MF=
1.5
20
5
<10
21
5
<10
22
5
<10
23
2.76
2.76
24
1
<2
25
1
<2
26
1
Q
III
27
1
<2
28
1
<2
29
1
<2
30
1
<2
31
2.5
<5
32
2.5
<5
33
2.5
<5
34
2.5
<5
35
2.5
<5
36
4.03
4.03
37
0.761
0.76
38
2.95
2.95
39
2.55
2.55
40
1.25
<2.5
41
1.25
<2.5
42
1.25
<2.5
43
1.25
<2.5
44
1.25
<2.5
45
1.25
<2.5
46
1.25
<2.5
47
1.25
<2.5
48
1.25
<2.5
12/13/95 PAGE'

TOXICANT ANALYSIS
12/13/95 PAGE

TOXICANT ANALYSIS
12/13/95 PAGE

TOXICANT ANALYSIS
12113(95 PAGE •

TOXICANT ANALYSIS
12/13/95 PAGE.
a i

TOXICANT ANALYSIS
12/IX95
PAGE:

TOXICANT ANALYSIS
12/73�85 PAGE
r�

TOXICANT ANALYSIS
Parameter= IToluene
Standard = I //, 0 S
n
BDL=1/2DLI
Actual Data
RESULTS
1
1.2
1.2
Std Dev.
6.733
2
0.25
<.5
Mean
4.6132
3
1
1
C.V.
1.4595
4
0.9
0.9
5
1.7
1.7
6
0.5
<1
Mint Factor =
5.4
7
0.5
<1
Max. Value
2 2. 7
9/I
8
3.2
3.2
Max. Pred Cw
122.09
g/I lii
9
6
6
Allowable Cw
3/,
g/I
10
7.6
7.6
11
0.5
<1
12
22.7
22.7
Linear Interpol. of MF
13
5.9
5.9
14
22.7
22.7
C.V.
1.4595
15
2.5
<5
C.V.lo
1.4
16
2.5
<5
C. V. hi
1.5
17
2.5
<5
MFhi
•• 5.5
18
5
5
MFlo
5.2
19
0.5
<i
M".4
20
• 12/13/95
PAGE'

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4 170

1 2/ 1 3/95
TOXICANT ANALYSIS
AHM
Facility Name
Town Ck. WWTP i
NPDES #
NCO023892 '
Ow (MGD)
12.5
7010s (cfs)
lWC (%)
._.._.._.._.._.._.._.._.._.._.._.._
36.8�
34.49'
Rec'ving Stream
Yadkin River
Stream Class
WS-V
_.._.._.._.._.._.._.._....................._.._.._.._.._..
.............
FINAL RESULTS '
Cadmium
OK I
i
Max. Prod Cw
2.73882367i
Allowable Cw
5.8
Chromium
OK 1
Max. Prod Cw
9.621
Allowable Cw
145.0••
Nickel
OK I
Max. Prod Cw
63.94999061
Allowable Cw
72.5':
Cyanide
LIMIT
I
Max. Pred Cw
138.090037;
Allowable Cw
14.5'
Copper
MONITOR
Max. Pred Cw
118.66•.
Allowable Cw
20.3
Zinc
MONITOR
Max. Prod Cw
1036.04971':
Allowable Cw
145.0
i
Lead
LIMIT
ax. Pred Cw
93.67i
Allowable Cw
72.5i
Flodde
OK I
'
Max. Prod Cw
2063.268221
Allowable Cw
5218.8i
Ei-rCd1j1t 70/0
(Ale fflI5 tA,)
M 3 — l9 9� (4ru- �)4 Y�149 ova-�a- 1"y"
i
Ltil
anol zrra n l� e; ,
7owh �� l�iGt/T��
12/13/95
lgtcl

12/13/95 TOXICANT ANALYSIS AHM
Parameter.
:Cadmium
Parameter.
Chromium
Standard.:
2r
Don't forget to check wllh Prebtl
Standard.)
50.
n
BDL 1/21)1.
Actual Date
RESULTS
n
BDL, 1/2DL
Actual Data
RESULTS
1
0.5
41
SW Dw.
0.261950224
1
5
<10
SW Day.
1.684
2
0.5
<1
Mean
0.399385965
2
5
<10
Mean
2.47
3
0.5
<7
C.V.
0.655882397
3
5
<10
C.V.
0.682
4
0.5
7
4
5
<10
5
0.5
<1
5
5
<10
6
0.5
<1
Mult Factor.
1.7
6
5.
<10
Muft Factor.
1.3
7
0.5
<1
Max. Value
1.8
7
5
<10
M®r. Value
7.4
8
0.51
47
iMax.PmdCv4
2.73882387
8
5
<10
Max. Prod Cw
9.62
9
0.5
<1
Allowable Owl
5.8
pw
9
5
<10
Allowable Ow
145.0
10
0.5
41
10
5
<10
11
0.5
<1
11
5
<10
12
0.5
<1
Unear Inte
a6on of MUL Factor
12
5
<10
Linear Interpol. ofMF
13
0.5
<1
13
5
<10
14
0.5
<1
C.V.
0.655882397
14
5
<10
C.V.
0.682
15
1.6
1.6
C.V. to
0.6
15
5
<10
C.V. to
0.6
16
1.2
1.2
C. V. hi
0.7
16
5
<10
C. V. M
0.7
17
0.5
<1
MFhi
t---1.8t
17
5
<10
MFhI
:- 1.3
18
0.5
<1
MFo
r Lei
18
5
<10
MFI0
: 1.3
19
0.5
<1
MF_l
1.71
1 19
5
<10
MF.
1.3
20
. 0.5
<1
20
5
<10
21
0.5
<1
21
5
<10
22
0.8
0.8
22
2.5
<5
23
0.25
<.5
231
2.5
<5
24
0.25
<.5
24
2.5
<5
25
0.251
a5.
25
2.5
<5
26
0.25
c5
26
2.5
<5
27
0.5
<1
27
2.5
<5
28
0.5
<7
1
1
28
2.5
<5
29
0.5
<7
29
2.5
<5
30
0.5
<1
30
2.5
<5
31
0.5
<7
31
5
<10
32
0.5
<7
1 321
5
<10
33
0.5
<7
1 331
5
<10
34
0.11
0.11
34
5
<10
35
0.1
0.1
35
5
<10X.
36
0.13
0.13
36
5
<10
37
0.125
<.25
37
5
<10
38
0.5
<1
38
5
<10
39
0.25
c5
39
5
<1.0
40
0.25
<.5
40
1
1
41
0.25
4.5
41
2
2
42
0.15
4.3
1 42
2
2
43
0.5
41
43
1
1
44
0.25
<5
441
1
<2
45
0.1
<.2
45
1
<2
46
0.1
<.2
46
1
<2
47
0.1
<.2
47
1
<2
48
0.05
<.1
48
1
<2
49
0.15
<.3
49
1
<2
50
0.4
0.4
50
1
<2
51
0.4
0.4
51
1
<2
52
0.3
0.3
52
1
<2
53
0.4
0.4
53
2.51
2.5
54
0.2
0.2
64
2.5
2.5
55
0.1
<.2
55
2.5
2.5
56
230
Od193
56
2.5
2.5
57
0.05
<.1
1
57
2.5
2.5
58
0.2
0.2
1
58
1.26
Q.5
59
59
1.25
<2.5
60
60
1.25
4.5
61
61
1.26
<2.5
62
62
0.4
0.4
63
63
1.25
<2.5
64
64
1.25
Q.5
65
65
1.25
<2.5
66
66
1.25
.2.5
67
67
1.25
<2.5
68
68
1.25
<2.5
69
69
1.25
<2.5
70
I
1-
701
1.25
<2.5
12/13/96 PAGE'
<c rr

12/13/95 TOXICANT ANALYSIS AHM
12/13f95 PAGE

TOXICANT ANALYSIS
oremeter.
fJickel
::::Parameter.
anlde
Standard.:
25;WO
Standard..
S.lLuA
n
BDLa1/2DL
Actual Data
RESULTS
n
BDW12DL
Actual Data
RESULTS
1
2.5
<5
Std Dev.
5.764
1
2.5
<5
Std Dev.
7.4815
2
2.5
<5
Mean
7.32
2
2.5
<5
Mean
5.3382
3
2.5
<5
C.V.
0.79
3
2.5
<5
C.V.
1.4015
4
2.5
<s
4
2.5
<5
5
2.5
<5
5
2.5
<5
e
2.5
<5
MWt Factor.
1.4
6
2.5
<5
Muft Feofor.
2.3
7
2.51
<5
Max. Value
46
W 7
2.5
<5
Max. Value
60
6
2.5
<5
MmL Prod Cw
83.95
8
2.5
<5
Mac. Prod Cw
138.09
e
2.5
<5
Allowable Cw
72S
1vWWAWq 9
2.5
<8
Allowable Cw
14.5
10
2.5
<5
10
2.5
<5
11
2.5
<s
11
2.5
<5
12
0.7
6.7
Unear Inteovd. of MFI
12
2.5
<5
Unear Into . of MF
13
6.3
6.3
13
8
8
14
2.5
<5
C.V.
0.79
14
2.5
<5
C.V.
1.4015
15
2.5
<5
C.V. to
0.7
15
2.5
<5
C.V. to
1.4
16
2.5<5
C. V.N
0.8
16
2.5
17
2.5
<5
MFhl
7.4
17
2.5
18
2.5
<5
MRo
1_3
18
8
8
MRo
2.3;
19
2.5
<5
MF.
_
1.4
19
2.5
<5
MF.
2.3
20
2.5
<5
20
2.5
<5
21
2.5
<5
21
2.5
<5
22
3
3
22
2.5
<5
23
1.5
<3
23
2.5
<5
24
1.5
<3
24
2.5
<5
25
1.5
<3
25
2.5
<5
2e
3.5
3.5
26
2.5
<5
27
5.1
5.1
27
2.5
<5
28
5.9
5.9
26
2.5
<5
29
4.2
4.2
29
2.5
<5
30
2.5
<5
30
2.5
<5
31
2.5
<5
31
2.5
<5
32
2.5
<5
32
6
8
33
5
5
33
2.5
<5
34
11.61
11.0
34
35
2.5
<5
35
8.7
8.7
2.5
<5
38
2.5
<5
36
2.5
<5
37
2.5
<5
37
5
<10
36
2.5
<5
38
5
<10
39
18
18
39
10
10
40
19
19
40
a
8
41
16
18
?a 41
8
6
42
18
18
42
a
8
43
141
14
43
a
8
44
18
18
<# 44
8
8
45
17
17
45
8
6
46
16
is
46
e
6
47
15
15
47
6
6
46
17
17
48
7
7
49
18
is
49
6
6
50
17
17
50
8
8
51
1 e
is
#S:? 51
2.6
<5
52
71
7
52
60
60
53
5
5
53
2.5
<5
54
5.3
5.3
54
8
6
55
6
6
55
58
2.5
<5
56
5.1
5.1
6
8
57
14
14
57
5
<10
56
10
10
5a
5
<10
59
5
5
59
5
<10
60
4
4
60
5
<10
61
6
8
61
5
<10
62
9
8
62
5
<10
63
8
6
63
64
5
<10
64
10
10
5
<10
65
12
12
85
5
<10
66
3
3
66
5
<10
67
7
7
67
68
5
<10
68
6
6
25
25
69
3
3
69
701
31
3
70
12I13�95 PAGE
�r i r

TOXICANT ANALYSIS
12/13/95 PAGE
t

TOXICANT ANALYSIS
Parameter=
C er
:.;:.>:.
•••••Parameter
me
Standard= !
.............7
g/I
Standard='
„_ _ _50ggA
n
BDL=1/2DL
Actual Data
RESULTS
n
BDL=1/2DL
Actual Data
RESULTS
1
50
<100
Std Dev.
16.1065
1
50
<100
Std Dev.
69.6935
2
50
<100
Mean
30.1953
2
50
<100
Mean
49.2024
3
501
<100
C.V.
0.53341
3
110
110
C.V.
1.21322
4
50
<100
4
160
160
5
40
40
5
50
<100
6
20
20
MuRFactor=
1.7
6
50
<100
MultFactor=
2.7
7
50
<100
Max. Value
69.8
IgA 7
380
380
Max. Value
380
jLgA
8
50
<100
Max. Prod Cw
118.66
/I '•EY'•r> 8
50
<100
Max. Pred Cw
1036.05
9
50
<100
Allowable Cw
20.3
A '` 9
50
<100
Allowable Cw
145.0
jLgA
101
50
<100
10
25
<50
Ill
25
<50
11
25
<50
12
25
<50
Linear Interpol. of MF
12
25
<50
Linear Interpol. of MF
13
25
<50
13
50
<100
14
50
<100
C.V.
0.53341
14
50
<100
C.V.
1.21322
15
50
<100
C.V. 10
0.5
15
50
<100
C.V. to
1.2
16
50
<100
C. V. hi
0.6
16
50
<100
C. V. hi
1.3
17
50
<100
MFhi
1.8
17
26
26
MFhi
2.9
18
17
17
MFIo
_ - -1.6
18
24
24
MFlo
i .............
2.7
19
20
20
MF=
1.7
19
21
21
MF=
2.7
20
20
20
'•`'° ' 20
10
QO
21
101
<20
1
21
30
30
22
10
<20
22
23
23
23
18
18
23
12.5
<25
24
25
<50
24
12.5
<25
25
25
<50
25
12.5
Q5
26
20
20
26
26
26
27
30
30
`'<' 27
25
<50
28
251
<50
28
25
<50
29
251
<50
1
29
41
41
30
3
3
30
44
44
31
19
19
31
50
50
32
30
30
32
30
30
33
7
7
k>':< 33
30
30
34
6
6
34
78
78
35
18
18
35
91
91
36
20
20
36
59
59
37
20
20
37
69
69
38
69.8
69.8
38
27.6
27.6
39
17
17
39
31.4
31.4
40
39.6
39.6
40
28
28
41
261
26
41
5
5
42
20
20
42
10
<20
43
23
23
43
44
44
12/13/95 PAGE'

TOXICANT ANALYSIS
OWN PAGE
.t to

TOXICANT ANALYSIS
12H3195 PAGE
r

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Ms. Coleen Sullins
Permits and Engineering Section
N. C. Division of Environmental Management
P. O. Box 29535
Raleigh, N. C. 27626-0535
Subject: City of Salisbury Yadkin River Outfall
Dear Ms. Sullins:
December 21, 1995
I would like to thank you and the other DEM staff members that met with us on
December 15 to discuss the modeling and development of NPDES permit limits for the
Yadkin River Outfall discharge. The presentation and discussion that followed was very
informative and helpful to us in making a decision on the final design. This letter will
confirm my telephone conversation of December 20 with Mr. Jay Lucas in which I
informed Mr. Lucas that the City would proceed with the design and construction of a
three port diffuser for the Yadkin River Outfall. Please proceed with issuance of the
Yadkin River NPDES Permit. Based on information provided at the December 15
meeting, it is our understanding that the NPDES permit limits for the Yadkin River Outfall
with a three port diffuser will be as follows:
Parameter
20 MGD
12.5 MGD
BOD (mg/l)
5/10
15/30
NN3 -N (mg/1)
2/4
6/ 12
D.O. (mg/1)
6
5
Cadmium
Monitor
Monitor
Chromium
Al o Mani' Monitor
Nickel
Monitor
Monitor
Cyanide (ug/1)
77.5
73
Copper
Monitor
Monitor
Zinc
Monitor
Monitor
Lead
Monitor
Monitor
Silver
Monitor
Monitor
Mercury (ug/1)
0.19
0.17
Toluene
Monitor
Monitor
IWC for Bioassay 6%
7%
CITY OF SALISBURY
P.O. BOX 479, SALISBURY, NORTH-CAROLINA
28145-0479
PP
f e/d
Ts5. //�1 / 0vlg f�
�A) - -r o , 12M ) Yi5.
CUl2

1. ;
1a M68
Do (91t) 6/H
fAJ
�.IV11if: �-Pon, Gh/(,� fl�llv; k7 AlM��
m;che& wi mil' Ae6llil� WO= 0279 e14.

J
�b'; We also discussed the need for a revised date to include in the new NPDES permit, and
�- the existing permit for Town Creek WWTP, .by which the City must have both existing
discharges relocated to the Yadkin River. We had previously agreed to April 30, 1997
based on plans to begin construction in spring'of 1995 and a two year schedule for
completion. Based on our discussion at the meeting regarding the time necessary for final
plan review and approval, and completing the.process of issuing a NPDES permit, we
believe that April is the earliest date that the projects could be advertised for bid, with
construction to begin in July. We therefore request that the City be given until June 30,
1998 to complete relocation of the discharges to the Yadkin River. That date also
coincides with the deadline for expending the N.C. bond loan money.
Once again thank you for your assistance in this matter. If you have any questions please
contact me at (704) 63 8-5204.
PC: Dave Treme
Peirson & Whitman
Barbara Sifford
Sincerely,
John C. Vest, P.E.
Utilities Director
2

North Carolina Division of Environmental Management
Water Quality Section / Intensive Survey Group
March 26, 1996
MEMORANDUM
To: Ruth Swanek
Through: Jay Saube4�
From: Howard Bryant 1,Gjy`j
Subject: Long-term BOD Analysis
for Salisbury
-Grants Creek
WWTP
County: Rowan
NPDES # NC0023884
Receiving Stream: Grants Creek
Sub -basin: 030704
DAY BOD
NH3-N
TKN-N
NOX-N TN-N
0
0.10
0.9
5.40
6.3
5 2.70
0.17
0.9
5.80
6.7
10 4.56
0.07
0.6
6.00
6.6
15 5.72
0.06
0.6
6.90
7.5
20 6.67
0.04
0.8
6.40
7.2
25 7.34
30 7.90
0.03
0.7
7.00
7.7
35 8.59
40 9.21
50 10.26
60 10.92
0.10
0.7
6.80
7.5
70 11.58
80 12.09
90 12.52
0.09
0.9
7.20
8.1
100 13.05
110 13.46
125 14.02
0.01
0.7
6.90
7.6
256 16.52
Date Collected: July 11, 1995
Collected by: Leslie Test evaluation:
excellent
0001-1 145
pH: 7.4
Seeded:
seeded
cc: Central Files
Regional Water Quality Supervisor

r
Memorandum
North Carolina Division of Environmental Management
Water Quality Section, Instream Assessment Unit
To: Jay Lucas
From: Andrew McDaniel
Thru: Carla Sanderson
Date: March 5, 1996
Subject: Comments on requested revisions to the Salisbury -Grants Creek WWTP draft permit
(NC0023884)
I have the following comments in response to the requested revisions to Salisbury's draft. pen -nit:
Revision #3: The total residual chlorine limit should remain in the permit, however the facility
__ only needs to monitor for it when chlorine disinfection is implemented. For
example if the UV system went down and the facility temporarily switched to
chlorine then the effluent monitoring requirement for chlorine should come into
effect.
Revision #4: I would like additional clarification on what weather or flow conditions the facility
is referring to which may present a hazard. Low flow conditions in particular
should not present a hazard and the facility should always monitor according to the
permit requirements. I have not visited the site so I will defer to the regi.on's
opinion on this request.
Revision #7: Toluene monitoring should remain in the permit. The wasteflow from Grants
Creek WWTP has a significant concentration of toluene. In .fact, 11 out of the 19
values for toluene used in the toxic spread sheet were above the detection level.
The facility may have been referring to the waste -flow from Town Creek WWTP
when stating that toluene concentrations have been below detection for the past two
years.

MEMORANDUM
North Carolina Division of Environmental Management
Water Quality Section, Permits and Engineering Unit
TO: Mike Parker, MRO
Carla Sanderson, IAU '\
FROM: Jay Lucas? / v
SUBJECT: Salisbury -Grants Creek WWTP, NCO023884
DATE: Feb. 23, 1996
Here are the requested revisions from Salisbury on the draft permit.
Please let me know your comments by March 5th. Thanks.
cc: Project File

,,i69 15:19 FAX [phone] CITY OF SALIS. 1@002/002
February 23, 1996
Mr, Jay B. Lucas, P.E.
NCDEHNR
Division of Environmendal Management
P. 0. Brno 29535
Raleigb, N-C. 27626-0535
Subject: NPDES Draft Pentit
Permit No. NCO023884
Grants Creek V VVTP
Rowan County
Dear Mr. Lucas:
After review of the subject draft permit, the City of Salisbury inquests that you consider n 8 the
following revisions prior to issuing the final permit:
1) Delete the requirement on the effluent limitations pages
(Table A.) for 85% removal of BOD5 and
TSS. Data for 1995 iudicates the following averages:
now BOD5
TSS
(MGD) (1484)
(mg/1)
("want Creek
Influent 4.10 98
108
Grant Creek
Industrial 0.73 204
117
7'aan Creek
3.69 162
100
Town Creek
Industrial 1.52 263
1$2
Combin
Intent 7_79 130
104
Combined
Industrial 2.25 234
150
CITY OF SALISBURY
P.O. BOX 479, SALISBURY, NORTH CAROLINA 28145-0479

123169
15:28 FAX [phone] CITY OF SALIS.
a 0011,001
The average BOD5 and TSS in industrial contributions, which account for 29% of the combined
influent flow, are well below typical domestic concentrations. Laundry operations at the VA
Hospital, Rowan Regional Medical Center , Catawba College and Livingstoneb Cle ollege lege e
contribute to produce an influent that is consistently low strength
numeric effluent limits for BOD5 and TSS, the unique characteristics of our wastewater in
Salisbury make compliance with the 85 % removal requirement problematic.
Relocation of the affiuex►t flows from Csrant Creek yVWTP and Towp Creels WWTP to the 'Yadkin
River will occur simultaneously, therefore there should be a single flow limitation of 12.5 MGD
listed on Table A. Language in the footnote denoted by ** should be changed to base notification
and action to rescind the Town Creek permit solely on relocation to the Yadkin River.
requirements and limit for total residual chiorne after to the `Yadkin. .��
3) Delete monitoring q ifter relocax �9
River because disinfection will be accomplished by ultraviolet radiation_
4) Add language to Table A- for in -stream monitoring requirements consistent with NCAC Title 5A,
Subchapter 2B, .0505 (c) (4) to clarify that stream sampling may be discontinued when flow or
weather conditions present a safety hazard.
15) If annual pollutant analysis monitoring was intended for 12.5 MGD and 20 MGD flow rates, add
to Table A. as an effluent characteristic in order to clarify the requirement.
6) Add corresponding flow limits to part a Conditions G, ld, and I in order to clarify chromic �
to>tioity monitoring requiremetts.
7) Delete the monitoring requirement for toluene in Table A. In adding the monitoring requirement
for tetrachloroethylene, the perolit states that monitoring maybe discontinued after two years if all
')here has not been a toluene result above the detection leveliV.,
results are below the detection level.
in the past two years.
In a related matter, the City of Salisbury requests that -the Town Creek permit (NC0023992) be modified to
change the date required for removal of discharge from Town Creek to June 30, 1998 in order to coincide
with the requirement the cdrant Creek permit. Thank you for your cooperation and assistance in this 1v
a
�fo
matter. If you have any questionsplease contact me at [phone].
�1
Sincerely,
Ae'Ai�6
John C. vest, P- B.
Utilities Director
JCV:sph
PC! City Council
Dave Treme
Barrett Lasater
Barbara Sifford

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DRISCOPIPE',-) 7600 AND 8600 INDUSTRIAL PIPE - Dimensions and Pressure Ratings
0
7
DIMENSIONS, INCHES
SUGGESTED DESIGN
NOMINAL
NOMINAL
JOINT. -'WORKING PRESSURE, PSI
SIZE': NominaF.', .':'.APProx. Min.
WEIGHT
LENGTH 73.40 F
INCHES •; OD: hickness
FT: -
7 606 PIPE
8600 PIPE
PRESSURE'
.,LOW
3 '
3500"t-f" :35
46
.38 . 43
47".
4 5o 1%
go
50
55,
35
3a
7- sa
.16 2. f, �: 32. S.
'.'-.Ilo
6--
51
a3
6 .5
.203
36 7
-10 0: Be
12 yv .3 1:&
0 48
9�43f*32.5t
783
.500
52
Iiii.00O.., -4-jd g
S92
47 ­-­
5
• '20"i'°i°33.6'"::.'.1540.
-45
4a
:.'44.
51-
-24 066
.:'.r , , ndA7
'2142
:43
47
` ­ 27.953'(ej '26.233 UZ ie,-.325
-.", 3 119"-
38 ­46
51
31.496 (it) -!1�%29ZW'7,�:- , '0 32.5
3958
.38 `46
51
36 : J
36.000 -:33,94Z.*-�z:`�:: .029'
-4817
. 38 :43
47-
42 42.000 39.4 1 A 1.292 32.5
7038
38 46
51
48 47.244 (3) -44.336- - 1.454 32.5
8909
38 46
51
60 PSI AND 65 PSI
6.625 6.086 0'.280. -23.5
-238
.38 64
71
a. 8.625. 0.322 27.
.355
38 57
62:
10- 1:10
687-
38 -
-60.
65
20 20.000 25A'.60-
:.38'-:.,
65:
24 24.000 2ISZ::.;'..2927.­.
:32.:-'-%-. 300
5 184
­38 `64
:71
100 PSI AND 110 PSI:-
V-
.5
46
30�1
95
-.,96
4 .15-5
163
-38 100.
110
6 (LIM. t:- 15.5
354
38
5.5
10
601
38 100
.110
t
­15.5
933
38 100
4 --15.5
1312
_100
ITO
14 .?r-
Z]104-tt M3
% .
38 . 100­­::
110
6 at Z
k
2064
38 100
110
-161 15.5
-2613
38.,
110
22.-V.. �387
71 15.5
'
.3728.::..
38
24 10-- - ;' - It= __- 5.5
38-.1100
1 110
(4)
V ;> 1 .1.
.40..
500' 150
160
.�7
2.' .216't --: --,11
62
350 ...150.
160
-A I
135
150
160
Be
223
38
160
.3 'OS;O6
345
5.421.;.<'­-. '0. 2- 60
484
38 -.15(1,
160:
8 0.784 11
921
38 150
160
10 0_977
1274
..38 150
160
2 50
12. 1... 160
1795
38 150
160
175PSI AND j9OPSI -­_-.':'_`.,
a
'3/4 1.050 0.824' 0.113 9.33
14
300 176
190
1 1.315 11049. 0.133 10
21
�300
178
1 1/4 1.660 1.304 0.178 9.33
36
.164
Soo 175
190
2 2.375 1.865 0.255 9.33
74
350 175
190
3 3.500 2.750 0.375 9.33
161
38 175
190
4 4.500 3.536 0.482 9.33
265
38 175
190
6 6.625 5.205 0.710 9.33
575
38 175
190
200 PSI AND 2211 PSI
8 8.625 6.545 1.040 8.3
1052
38 200
220
NOTE Ai n.n. ...... 1,- 11) N .......... 1 0:) 2
"IM ......... 1.".! 1.) .......
It- I".1.% Of ff.. f"11 .........

IC HANDBOOK
imon device for accurately measur-
(rticularly when a permanent meter .;
i the coefficient for the meter has
bration, and the meter is correctly
he probable error in computing the
)ne per cent. -
:ieter consists of a converging por-
_r of approximately one third the
ierging portion to reduce loss of
g. 68. The length of the converg-
times the diameter of the main
Hvergence is about 10 degrees in-
stance from the nearest elbow or
:ter should be at least 10 times the
se straightening vanes should be
ntrance.
-noulli's Theorem:
a 1
n calitiiation data. While this co -
out 0.94 to more than unity it is
ere the upstream manometer con -
inches.
diameter = d
d,
2 ft./sec.2).
;ure between the entrance section
a manometer, in feet.
s
a
turi meter.
-essures h, and h, may be taken
i the pressures are low. When
,ercury manometer which indi-
11 — h, directly, is most often
Iva �
PUMP TESTING 203
used. Gauges can also be used, but they can be read less accurately
than a manometer and do require calibration. In commercial instal-
lations of venturi meters instruments are often installed that will
continuously indicate, record and/or integrate the flow. They also
require calibration so, when conducting a test, it is best to use a
differential manometer connected directly to the meter to measure
h, — h,.
NOZZLES
A nozzle is, in effect, the converging portion of a venturi tube.
The water issues from the nozzle throat into the atmosphere. The
pressure h,, therefore, is atmospheric pressure. To calculate the
flow from a nozzle use the same formula as for the vcnturi meter.
The head, h, in the formula will be the gauge reading h,.
ORIFICES
Approximate discharge through orifice
Q = 19.636 Kd' V—h J — —1 ((d11�
1-1D1
Q = 19.636 Kd' V_h
where d is greater than .3
d
where D is less than .3
Q = flow, in Gpm
d = dia. of orifice or nozzle opening, in.
h = head at orifice, in feet of liquid.
D = dia. of pipe in which orifice is placed.
K = discharge coefficient
It ENTRANT TUB(
$MAMP MG(D
SOUAA( (DG(D
2( (NTTUNT TUS(
S0UA1( (DG(D
w(tt 80UNO(D
1won,I
'
-
�--
FIG.'69. Typical orifice coefficients-f
tCourlety LTgertnll-Karol (:u. See page- !.

ANALYSIS OF PROPOSED
YADKIN RIVER OUTFALL
. CITY OF SALISBURY
♦ Objective: predict mixing and develop effluent limits for
alternative outfall designs
♦ Model: Cornell Mixing Zone Expert System (CORMIX)
• predicts dilution characteristics and plume geometry
in receiving waters
• developed at hydraulics laboratory, Cornell SCEE
. EPA supported
. three subsystems:
submerged single port outfall
submerged multiport outfall
surface discharge
. version 2.10
♦ Discharge conditions:'
. 20 MGD (.876 m3/s) and 12.5 MGD (.548 m3/s)
• negatively buoyant effluent .
. at new location, line must cross channel to reach
point of discharge

DIFFUSER DESIGN OPTIONS
♦ Diffuser design: based on information submitted by
Peirson and Whitman
♦ Multiport diffuser:
• single line with 3 ports
• diffuser length = 7 m
• diffuser type = unidirectional perpendicular
• nozzles oriented downstream, 450 discharge
• port diameter = 14 inches (.356 m)
• discharge height = 2.5 ft (.76 m)
♦ Single pipe: 24 inch diameter (.61 m)
♦ Same channel location used for both options

AMBIENT AND DESIGN CONDITIONS
Combination of riverine and lacustrine conditions
7Q10 = 1030 cfs (29.1 m3/s)
Depth is controlled by darn operation
Target water level: within 5 ft of full pool
(May 15 - September 15)
Two critical condition scenarios were evaluated:
• 7Q10 at full pool
• 7Q10 at 5 ft below full pool
Full pool scenario used to develop toxics limits
Mixing zone criteria:
• mixing zone not to exceed 1/3 of channel width
. standards must be, met at -edge of mixing zone ,
• toxics limits based on dilution at edge of mixing zone

DISCHARGE VELOCITIES
(3 ports at 20 MGD)
port diameter
(inches) (meters)
velocity
(m/s)
10
.254
5.76
12
.305
3.99
14
.356
2.93
15
.381
2.56

SALCORM2.XLS
Salisbury Yadkin River Outfall:
Plume width W for single and multiport diffuser, 20 m_gd aj 5
ft below full pool and M 0
40 left bank
20
.E 0
F-
5�0 100 150 200 250 300 350 400 450 500
_20
-40 - three port diffuser
12 single pipe - '� _ - - - _ _ _ _ right bank
"60 distance down river (rrt)
Site data for 5 ft below full pool, discharge = 1030 cfs (29.1 m/s)
actual channel schematic
width 540 ft 064.6 m) width 330 ft (100.6 m)
max depth 5 ft (1.52 m) mean depth 4 ft (1.22 m)
xsectional area 1320 sq ft xsectional area 1320 sq ft
velocity .778 ff s (.2371 m/s)
'
aJg
dilution:
dilution:
distance
3 port
single
(m)
0
3.1
1.8:1
3.5-'--
5.3:1
16
6.8:1
42
9.1:1
2.5:1
.81
11.9:1,
3.4:1
122
15.0:1
4.6:1
1.59
18.2:1
6.3:1
199
22.7:1
8.5:1
240
27.8:1
11.3:1
330
20.3:1
432
32,4:1
493
33.2:1
bold=centerline dilution,
otherwise avg
Outfall:
single port: 24 " diameter
exit veloc=2.99 m/s
3 port: 140 diameter, 7m long
exit veloc= 2.Wm s
Page 2

D
SALX2.XLC
Fv Il Poo I .
10
t 6
0 2 + --
10 01
c+) U) n P ch U) f\ P V) t\ 0% V). LO n (> CV) to t\ P ch LO n P
cn CV)ch cq CV)V. V V V V O O O O O %0 %0 %0 %0 %0
width (x 10 it)
VerTi c.G� s c�`Q. 15
�xa99•�raTe� ,
S ff WOW fV
10
8
r 6 230
4 9
p
0 o.
pp.. {� cc�� cry
— - ^ — N N N N N ch cC M c^7 %1 4-1 Q � '^V � � � � � � _ �O •O � to- � n
width (x 10 M
Page 1

SALCORM 1.XLS
Salisbury Yadkin River Outfall:
Plume width (m) for single and ff 4ltiport diffuser, 20 mgd at
full pool and ;'6Z10
E
20
left bank
0
0
50
100 150 200 250 300 350
-20
three port diffuser
�
a
-80
�'
single pipe
g pip
= _
a
13
-100
right bank
-120
distance down river (m)
Site data for full pool, discharge - 1030 cfs (29.1 m3/s)
actual channel
schematic
width 700 ft (213.4 m) width 490 ft (149.4 m)
max depth 10 ft (3.05 m) mean depth 8 ft (2.44 m)
xsectional area 4575 sq ft xsectional area 3920 sq ft
velocity .262 ft/s (.0798 m/s)
Dilution
centerline
avg
dilution:
dilution:
distance
3 port
single
(m)
0
3.5
6.7:1
16.75
2.21
31.3
2.3:1
45.8
2.4:1
55.3
14.5:1
80.5
2.5:1
107
19.3:1
149.7
2.7:1
159
23.2:1
210.9
26.5:1
218.9
2.9:1
314.6
32.1
3.2:1
Outfall:
single port: 24" diameter
exit veloc=2.99 m/s
3 port: 14" diameter, 7 m long
exit veloc=2.93 m/s
Page 2

Cross-section at Proposed Discharge Site: Full Pool
10
F
8
4
8ff
"0
2
,
'
CO
1Q
n
01
M
to
r`
O.
■-
M
N
N
N
"
N
N
M
M
M
M
M
'd'
V
Q
�7
mod'
`
L
M
�
L0
1O
10
width (x 1Oft)
.vertical scale exaggerated
Site data for full pool, discharge - 1030 cis (29.1 m3/s)
actual channel schematic
width
700 ff (213.4 m)
width
490 ff (149.4 m)
mean depth
6.5 tt (1.98 m)
depth
8 ff (2.44 m)
max depth
10 ft (3.05 m)
xsectional .area
3920 sq ff
xsectional area
4575 sq ff
velocity
.262 ff/s (.0798 m/s).
Discharge location: 46.2 m from left bank

Cross-section at Proposed Discharge Site: 5 Feet Below Full Pool
10
8 330 feet
t 6
14
N 2 4 feet
0 _ pp., _cr) _ l� _ _ cc+r�� l� _
ch n O' 0' N N N N CV ch 2 M M M V 'fit '�T �7 Z � 0 'o 2 2 ro � r\
width (x 1Off)
'vertical scale exaggerated
Site data for 5 ft below full pool. discharge = 1030 cfs (29.1 m/s)
actual channel schematic
width 540 ff (164.6 m) width 330 ff (100.6 m)
mean depth 2.4 ff (73 m) depth 4 ff (1.22 m)
max depth 5 ff (1.52 m) xsectional area 1320 sq ff
Ksectional area 1320 sq ff velocity .778 ff/s (.2371 m/s)
Discharge location: 45.7 m from left bank

TOXICS LIMITS
SALISBURY YADKIN RIVER OUTFACE*
/
20 MGD
single port
Discharge
3 port diffuser
12.5 MGD
single port
Discharge
3 port diffuser
Dilution
2.2:1
15.5:1
2.9:1
14.6:1 Y-
IWC for Toxicity Test
45%
6%
34%
7%
Limits (µg/1):
�-
Cadmium
4.4
M
5.8
M
Chromium
M
M
M
Nickel
55.0
M
M
M
Cyanide
11.0
77.5
14.5
73.0
Copper
M
M
M
M
Zinc
M
M
M
M
Lead
55.0
M
72.5
M
Silver
M
M
M
M
Mercury
0.03
0.19
0.03
0.17
Toluene
24.2
M
31.9
M
Fluoride
M
M
* Design conditions f�-ullpool 7Q10, plume width = 1/3 channel width
M = monitor unless in LTN? 12-14-95

Salisbury Yadkin River Outfall:
Plume width (m) for single and multiport diffuser, 20 mgd at
full pool and MO
60
C
40
-
_ - left bank
i
E
2
0
fE
-205`0�
100 150 200 250 300 350
three port diffuser
13
It
_80
single pipe
- =�
-100
_
_'` - right bank
-120
distance down river (rr>)
Site data for full pool, discharge m 1030 cfs (29.1 m3/s)
actual channel schematic
width 700 ft (213.4 m) width 490 ft 049.4 m)
mean depth 6.5 ft (1.98 m) depth 8 ft (2.44 m)
max depth 10 ft (3.05 m) xsectional area 3920 sq ft
xsectional area 4575 sq ft velocity .262 ft/s (.0798 m/s)
December,1995
Dilution
distance
3 port
single
downriver
(m)
' 3.5
6.7:1
16.75
2.2:1
31.3
2.3:1
45.8
2.4:1
55.3
14.5:1
65.7
15.5:1
80.5
2.5:1
107
19.3:1
149.7
2.7:1
159
23.2:1
218.9
2.9:1
314.6
32.1
3.2:1
bold; plume width =1 /3 channel width
(49.8 m)
Outfall:
single port: 24" dlameter
exit veloc=2.99 m/s
3 port: 14" diameter, 7 m long
exit veloc=2.93 m/s

0
N 40
0
E
0 20
E
0
-20
v
1 -40
.f
Salisbury Yadkin River Outfall:
Plume width (m) for single and multiport diffuser, 20 mgd at 5
ft below full pool and 7Q10
.50 100 150 200 250 300 350 400
*--single pipe
thret port-
rlIffllSAr
distance down river (m)
Site data for 5 ft below full pool, discharge . 1030 cfs (29.1 m/s)
actual channel
schematic
left bank
right bank
vidth
540 ft 064.6 m)
width
330 ft 0 00. 6 m)
nean depth
2.4 ft (.73 m)
depth
4 ft (1.22 rh)
nax depth
5 ft (1.52 m)
xsectional area
1320 sq ft
:sectional area
1320 sq ft
velocity
.778 ft/s (.2371 m/s)
December,1995
distance
3 port
single
downriver
(m)
3.1
1.8:1
3.5
5.3:1
16
6.8:1
28.8
8.1:1
42 9.1:1
52.6
2.80
62.4
10.7:1
81
11.9:1
3AI
122
15.0:1
-- -4.6:1
159
18.2:1
6.3:1
199
22.7:1
8.5:1
240
27.8:1
11.3:1
330
20.3:1
432
32.4:1
493
33.2:1
bold: plume width = 1 /3 channel width
(33.5 m)
single port: 24 " diameter
exit veloc=2.99 m/s
3 port: 14" diameter, 7m long
exit veloc= 2.93 m/s

SALISBURY CONCERNS
12/15/95
• An existing amendment is in house which has not been approved. Provide a revised
engineering amendment which addresses the proposed realignment of the effluent outfall
and the relocation of the discharge point. All modifications that are anticipated as a part
of this construction project should be clearly addressed.
• An environmental assessment should be included in this document for our review.
• A copy of the written speculative limits from the Water Quality Section should be
included in the amendment.
• In the event that the effluent pump station and or diffuser is modified, this should be
addressed.
• The previously understood elevation of the 100 year flood has changed. Please explain
how this will affect what is proposed for the first phase of the project.
• Provide a schedule for the following:
1. Receipt of written speculative limits from the Water Quality Section.
2. Receipt of a revised engineering amendment.
3. Receipt of revised plans and specifications.
4. Receipt of an NPDES permit.
5. Initiation of construction.
6. Completion of construction.
• Bonds were sold for this project on May 31, 1995. Proceeds from the bond sale must be
expended prior to June 1, 1998. This means that the construction must be complete prior
to June 1, 1998 and the contractor must be paid in full.
• In the event that a diffuser of any type is required or chosen based on more stringent
effluent limits, the project should be also be bid without the diffuser requirements so that
we can determine the cost imposed by a diffuser requirement.

3�V(y
e ss d1l
OF
ri
),
I-S
let')
.31
S*. S,
&X� Ck.3
c S. �,
9.81 1-7.9
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oq "A I
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Page 1
Note for Dave Goodrich
From: Jim Blose
Date: Thu, Sep 28, 1995 9:52 AM
Subject: Salisbury discharge
To: Dave Goodrich; Jay Lucas; Steve Bevington
FYI: Data from a time of travel study conducted by the USGS in the early 70s supports the
view that conditions in the Yadkin are influenced by High Rock Lake in the area of the
proposed discharge. The report notes that travel times in the segment from the South Yadkin
to the I-85 bridge are affected by the lake when flows at the Yadkin College gage are 'low'.
When the lake is at 'normal elevation' (presumably full or near full during the summer)
'natural flow' characteristics exist only when flows at Yadkin College are >4000 cfs (the
gage has a MAF of about 3000, with mean flows of 2300 in July and August and 2100 in
September. 7Q10 is 640). Source: USGS Water Resources Investigation 6-74.

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r„
Calculating Effective 7Q10 Flows Based on Dilution
7/5/95
AHM
To improve mixing between the effluent and the Yadkin River the City of Salisbury plans
to construct a diffuser with a minimum 10: 1 dilution ratio. Therefore, the instream waste
concentration (IWC) at the diffuser is assumed to be 10%. Given this information the
effective 7Q10 flow can be back calculated as follows:
By definition,
Dilution =1 / IWC =1 / 0.10 =10
and
IWC = Qw / (Qw + 7Q10)
where: Qw = wastewater flow (cfs) =12.5 MGD * 1.55=19.375 cfs
7Q10 = design flow (cfs)
substituting,
Dilution = (Qw + 7Q10) / Qw
rearranging,
7Q10 = (Dilution * Qw) - Qw
7Q10 = Qw * (Dilution - 1)
7Q10 = 19.375 cfs * (10 - 1) =174 cfs,
10
L ( I n

12/13/95
AHM
r .
4�
h Calculating Effective 7010 Flows Based on Dilution
Faclllty:Gmnts CIL WWTP
Permit No.:NC0023884
Comments: This work sheet is for a Qw=12.5 MGD with a diffuser.
To improve mixing between the effluent and" tYadldn River I the Town of Salisburyplans to construct a diffuser
with a minimum 1 14.60 Ito 1 dilution ratio.
Therefore, the instream waste concentration (IWC) at the diffuser is = 6.85 %
Given this information the effective 7010 flow can be back calculated as followed:
By definition: Dilution=l/IWC=14.6 and IWC=Qw/(Qw + 7010)
where: Qw=wastewater flow (cfs)= i 12.5 MGD which = 19.38 cfs
7010 = design flow in river (cfs)
Substituting,
Dilution = (Qw + 7010) / Qw
Rearranging,
7Q10 = (Dilution ' Qw) / Qw
7Q10 = Qw' (Dilution - 1)
7Q10 = 263.5 cfs
Page 1

AHM
Calculating Effective 7010 Flows Hared on Dilution
l Facility: Proposed WWTP
Permit No.:
Comments: This work sheet Is for a Qw=20 MGD with a diffuser.
To improve mixing between the effluent and the :Yadkin River i the Town of Salisbury plans to construct a diffuser
with a minimum 15.50 Ito 1 dilution ratio.
Therefore, the instream waste concentration (IWC) at the diffuser is = 6.45 %
Given this information the effective 7Q10 flow can be back calculated as followed:
By definition: Dilution=1AWC=15.5 and IWC=Qw/(Qw + 7Q10)
where: Qw--wastewater flow (cfs)= 20 MGD which = 31.00 cfs
7Q10 = design flow in river (cfs)
Substituting,
Dilution = (Qw + 7Q10) / Qw
Rearranging,
7Q10 = (Dilution ' Qw) / Qw
7Q10 = Qw(Dilution - 1)
7Q10 = 449.5 cfs
Page 1

TOXICS LIMITS
SALISBURY YADKIN RIVER OUTFACE
20 MGD
single port
Discharge
' 3 port diffuse
12.5 MGD
single port
Discharge
3 port diffuser
:Dilution
2.2:1
15.5:1
2.9:1
14.6:1
.IWC for Toxicity Test
45%
6%
34%
Limits (µg/l):
Cadmium
. 4.4
M
5.8
M
Chromium
M
M
M
Nickel
55.0
M
M
M
Cyanide
11.0
77.5 -
14.5 .
73.0
Copper
M
M
M
M
Zinc
M
M
M
M
Lead
55.0
M
72.5
M
Silver
M
M
M
M
Mercury
0.03.
0.19
0.03
0.17
Toluene
24.2
M
31.9
M
Fluoride
M
M
* Design conditions: fullpool, 7Q10, plume width = 1/3 channel width .
M = monitor unless in LTMP —
M14-95

r 4 . . �tCooZ30b4
Memorandum
North Carolina Division of Environmental Management
Water Quality Section, Instream Assessment Unit
To: Jay Lucas
From: Andrew McDaniel �,/✓�
Thru: Carla Sanderson
Date: January 9, 1996 �1
In response to your memo dated December 21, 1995 I have attached the limits for the City of
Salisbury for the following waste flows:
1.5 MGD to Grants Creek
12.5 MGD to the Yadkin River
20 MGD to the Yadkin River
The limits for the 12.5 MGD and 20 MGD facilities are based on a diffuser design which
delivers a 14.6:1 and 15.5:1 dilution ratio, respectively.
cc: Rex Gleason
Mike Parker

Jr 1 . . .
Conventional Parameters
W asteflow (MGD):
BOD5 (mg/1):
NH3N (mg/1):
DO (mg/1):
TSS (mg/1):
Fecal Col. (/100 ml):
pH (SU):
Residual Chlorine (µg/1):
TP (mg/1):
TN (mg/1):
Grants Creek Yadkin River Yadkin River
Monthly Average Monthly Average Monthly Average
Summer Winter Summer Winter Summer Winter
7.5
7.5
12.5
12.5
20
20
15
30
15
0
5
1
6
12
6
12
4
5
5
5
5
6
6
30
30
30
30
30
30
200
200
200
200
200
200
6-9
6-9
6-9
-9
6-9
6-9
monitor
monitor
monitor
monitor
28
28
monitor
monitor
monitor
monitor
monitor*
monitor*
monitor
monitor
monitor
monitor
monitor*
monitor*
* Nutrient limits may be recommended subject to the outcome of the High Rock Lake Modeling
Project. It is recommended that the 20 MGD facility be designed for biological nutrient removal.
'"
Wasteflow (MGD)
Cd (ug/L):
Ni (ug/L):
Cyanide (ug/L):
Cu (ug/L):
Zn (ug/L):
Pb (ug/L):
Ag (ug/L):
Hg (ug/L):
Toluene (ug/L):
Tetrachloroethylene:
Cr (ug/L):
Fluoride (mg/L):
Al (ug/L):
TDS (mg/L):
Chlorides (mg/L):
APAM
Chronic Toxicity Test
P/F (Quarterly Avg.)
Toxics/Metals
Grants Creek Yadkin River
7.5 12.5
Daily Max. Weekly Avg. Daily Max.
Yadkin River
20
Weekly Avg. Daily Max.
monitor
monitor
monitor
monitor
monitor
monitor
" monitor
73
29
77.5
310
monitor
monitor
monitor
monitor
monitor
monitor
37.0
monitor
monitor
monitor
monitor
monitor
0.018
0.17
0.65
0.19
0.75
monitor
monitor
monitor
monitor
monitor +
75
2.7
monitor
monitor
monitor
monitor
monitor
67%
67%
7%
7%
6%
6%
+ The Tetrachloroethylene monitoring requirement may be dropped if after reviewing future DMR
data from the 12.5 MGD facility it is found that tetrachloroethylene is not a problem. Monitoring for
tetrachloroethylene was recently recommended for the 12.5 MGD WLA therefore there is currently no
DMR data for this toxicant.