NC0021873_Permit (Issuance)_19970120

NPDES DOCUMENT !;CANNINe COVER SHEET
NPDES Permit:
NC0021873
Mayodan WWTP
Document Type:
Permit Issuance,
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Complete File - Historical
Engineering Alternatives (EAA)
Correspondence
Owner Name Change
Instream Assessment (67b)
Speculative Limits
Environmental Assessment (EA)
Document Date:
January 20, 1997
This document is printed on reuse paper - ignore any
content on the rezrerse side

State of North Carolina
Department of Environment,
Health and Natural Resources
Division of Water Quality
James B. Hunt, Jr., Governor
Jonathan B. Howes, Secretary
A. Preston Howard, Jr., P.E., Director
Mr. Jerry Carlton
Town Manager
210 West Main Street
Mayodan, North Carolina 27027
Dear Mr. Carlton:
A77A
,?/F
�EHNFi
January 20,1997
Subject: NPDES Permit Issuance
Permit No. NC0021873
Mayodan WWTP
Rockingham County
In accordance with the application for a discharge permit received on July 29, 1996, the Division is
forwarding herewith 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.
If any parts, measurement frequencies or sampling requirements contained in this permit are unacceptable
to you, you have the right to an adjudicatory hearing upon written request within thirty (30) days following
receipt of this letter. This request must be in the form of a written petition, conforming to Chapter 150B of the
North Carolina General Statutes, and filed with the Office of Administrative Hearings, Post Office Drawer
27447, Raleigh, North Carolina 27611-7447. Unless such demand is made, this decision shall be final and
binding.
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 Water Quality 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 Mack Wiggins at telephone number (919)
733-5083, extension 542.
Sincerely,
Original Signed By
David A. Goodrich
A. Preston Howard, Jr., P.E.
cc: Central Files
Winston-Salem Regional Office
Mr. Roosevelt Childress, EPA
Permits and Engineering Unit
Facility Assessment Unit
Aquatic Survey & Toxicology Unit
P.O. Box 29535, Raleigh. North Carolina 27626-0535 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer 50% recycled / 10% post -consumer paper

Permit No. NC0021873
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT, HEALTH, AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
PERMIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
In compliance with the provision of North Carolina General Statute 143-215.1,
other lawful standards and regulations promulgated and adopted by the North Carolina
Environmental Management Commission, and the Federal Water Pollution Control Act, as
amended,
Town of Mayodan
is hereby authorized to discharge wastewater from a facility located at
Mayodan Wastewater Treatment Plant
on NC Highway 135 West
southeast of Mayodan
Rockingham County
to receiving waters designated as the Mayo River in the Roanoke 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 March 1, 1997.
This permit and authorization to discharge shall expire at midnight on January 31, 2002.
Signed this day January 20, 1997.
'i;ginal Signed By
David A. Goodrich
A. Preston Howard, Jr., P.E., Director
Division of Water Quality
By Authority of the Environmental Management Commission

Permit No. NC0021873
SUPPLEMENT TO PERMIT COVER SHEET
Town of Mayodan
Mayodan Wastewater Treatment Plant
is hereby authorized to:
1. Continue to operate a 3.0 MGD extended aeration treatment plant consisting of bar screens,
lift station, dual path aeration basins, secondary clarifiers, chlorination/dechlorination, gravity
thickeners, aerobic digester, and sludge drying beds located at Mayodan WWTP, NC
Highway 135 West, southeast of Mayodan, Rockingham County (See Part III of this Permit),
d
2. Discharge from said treatment works at the location specified on the attached map into the
Mayo River which is classified as Class C waters in the Roanoke River Basin.

-•i
•
•i
ROAD CLASSIFICATION
PRIMARY HIGHWAY
HARD SURFACE
SECONDARY HIGHWAY
HARD SURFACE 1=M=1
LIGHT -DUTY ROAD, HARD OR
IMPROVED SURFACE
UNIMPROVED ROAD = = =
Latitude: 36°24'25" Longitude. 79°57'56"
Map # B19NW Sub -basin 03-02-02
Stream Class C
Discharge Class
Receiving Stream
01 38 40 50 55
Mayo River
Qw: 3.0 MGD Permit expires: 1/31/02
' 2153
-Discharge point 4 ; _ I�
•*--
ice• _�.��.%.�.. \, Y•r.✓'r i•,6
1!Iadis_on -
2177
•
1 _
am, ll
I ;
•
'1..i 58
Riverview
/4 Cem
60
0
1 0 1 KILOMETER
SCALE 1:24 000
0
1 MILE
7000 FEET
CONTOUR INTERVAL 20 FEET
Town of Mayodan WWTP
NC0021873
Rockingham County

A. (1) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS SUMMER (April 1 - October 31)
Permit No. NC0021 b 3
During the period beginning on the effective date of the permit and lasting until expiration, the Permittee is authorized to discharge from outfall(s) serial number
001. Such discharges shall be limited and monitored by the Permittee as specified below:
asurem e;ni
requeircy <.
Flow
3.0 MGD
Continuous
Recording
I or E
BOD, 5 day, 20°C 2
30.0 mg/I
45.0 mg/I
Daily
Composite
E
Total Suspended Residue 2
NH3 as N
Dissolved Oxygen
30.0 mg/1
14.0 mg/1
45.0 mg/I
Daily
Daily
Composite
Composite
Daily
Grab
E, U, D
Fecal Coliform (geometric mean)
Total Residual Chlorine
200/ 100 ml
400/100m1
Daily
Grab
E
28 µg/I
Daily
Grab
E
pH3
Daily
Grab
E, U, D
Temperature
Conductivity
Daily
Grab
E, U, D
Daily
Grab
E, U, D
Total Phosphorus
Monthly
Composite
E
Total Nitrogen (TKN + NO2 + NO3)
Chronic Toxicity 4
Cadmium
Monthly
Composite
Quarterly
Composite
34.0 µg/I
Weekly
Composite
Copper
2/Month
Composite
Cyanide
Lead
Mercury
Zinc
2/Month
Grab
0.21 µg/1
2/Month
Weekly
Composite
Composite
2/Month
Composite
Notes:
1
2
Sample locations: E - Effluent, I - Influent, U - Upstream at NC 135, D - Downstream at NCSR 2177. Instream samples shall be grab samples and shall be
conducted 3/week during the months of June, July, August, and September, and weekly during the remainder of the year.
The monthly average effluent BOD5 and Total Suspended Residue concentrations shall not exceed 15% of the respective influent value (85% removal).
3 The pH shall not be Tess than 6.0 standard units nor greater than 9.0 standard units.
4 Chronic Toxicity (Ceriodaphnia) P/F at 6%; March, June, September, and December See Part III, Condition F.
There shall be no discharge of floating solids or visible foam in other than trace amounts.

A. (2) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS WINTER (November 1 - March 31)
Permit No. NC0021873
During the period beginning on the effective date of the permit and lasting until expiration, the Permittee is authorized to discharge from outfall(s) serial number
001. Such discharges shall be limited and monitored by the Permittee as specified below:
Flow
Month)
Averaa
3.0 MGD
Continuous
am
ry
Recording
5
I or E
BOD, 5 day, 20°C 2
30.0 mg/I
45.0 mg/I
Daily
Composite
E
Total Suspended Residue 2
NH3 as N
30.0 mg/I
45.0 mg/I
Daily
Composite
3/Week
Composite
Dissolved Oxygen
Daily
Grab
E, U, D
Fecal Coliform (geometric mean)
Total Residual Chlorine
pH 3
200/ 100 ml
400/ 100 ml
Daily
Grab
E
28 µg/I
Daily
Daily
Grab
Grab
E
E, U, D
Temperature
Conductivity
Daily
Daily
Grab
Grab
E, U, D
E, U, D
Total Phosphorus
Monthly
Composite
E
Total Nitrogen (TKN + NO2 + NO3)
Chronic Toxicity 4
Cadmium
Monthly
Composite
Quarterly
Composite
34.0 µg/I
Weekly
Composite
Copper
2/Month
Composite
Cyanide
Lead
2/Month
Grab
2/Month
Composite
Mercury
Zinc
0.21 µg/I
Weekly
Composite
2/Month
Composite
Notes:
2
Sample locations: E - Effluent, I - Influent, U - Upstream at NC 135, D - Downstream at NCSR 2177. lnstream samples shall be grab samples and shall be
conducted 3/week during the months of June, July, August, and September, and weekly during the remainder of the year.
The monthly average effluent BOD5 and Total Suspended Residue concentrations shall not exceed 15% of the respective influent value (85% removal).
3 The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units.
4 Chronic Toxicity (Ceriodaphnia) P/F at 6%; March, June, September, and December; See Part III, Condition F.
There shall be no discharge of floating solids or visible foam in other than trace amounts.
,,,
•

Part III NPDES No. NC0021873
G. CHRONIC TOXICITY PASS/FAIL PERMIT LIMIT (QUARTERLY)
The effluent discharge shall at no time exhibit chronic toxicity using test procedures
outlined in the "North Carolina Ceriodaphnia Chronic Effluent Bioassay Procedure,"
Revised November 1995, or subsequent versions.
The effluent concentration at which there may be no observable inhibition of reproduction
or significant mortality is 6.0 % (defined as treatment two in the procedure document).
The permit holder shall perform quarterly monitoring using this procedure to establish
compliance with the permit condition. The tests will be performed during the months of
March, June, September, and December. Effluent sampling for this testing shall be
performed at the NPDES permitted final effluent discharge below all treatment processes.
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, DWQ Form AT-1 (original) is to be sent to
the following address:
Attention: Environmental Sciences Branch
North Carolina Division of
Water Quality
4401 Reedy Creek Road
Raleigh, North Carolina 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 there be no discharge of flow from the facility during a month in which toxicity
monitoring is required, the permittee will complete the information located at the top of the
aquatic toxicity (AT) test form indicating the facility name, permit number, pipe number,
county, and the month/year of the report with the notation of "No Flow" in the comment
area of the form. The report shall be submitted to the Environmental Sciences Branch at the
address cited above.
Should 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 the permittee fail to monitor during a month in which toxicity monitoring is
required, 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 Water Quality indicate potential impacts to the receiving stream, this
permit may be re -opened and modified to include alternate monitoring requirements or
limits.

Part III NPDES No. NC0021873
NOTE: Failure to achieve test conditions as specified in the cited document, such as
minimum control organism survival, minimum control organism reproduction, and
appropriate environmental controls, shall constitute an invalid test and will require
immediate follow-up testing to be completed no later than the last day of the month
following the month of the initial monitoring.

NPDES WASTE LOAD ALLOCATION
PERMIT NO.: NC0021873
PERMITTEE NAME:
FACILITY NAME:
Town of Mayodan
Mayodan WWTP
Facility Status: Existing
Permit Status: Renewal
Major -q Minor
Pipe No.: 001
Design Capacity: 3.00 MGD
Domestic (% of Flow): 86 %
Industrial (% of Flow): 14 %
Comments:
%NstcLeari- nwrrtox *Dr_ 3.o r , but Cui
t -�G`
cev�aJ', (.W.'t a� �` M
RECEIVING STREAM: the Mayo River
Class: C
Sub -Basin: 03-02-02
Reference USGS Quad: B 19 NW (please attach)
County: Rockingham
Regional Office: Winston-Salem Regional Office
Previous Exp. Date: 1/31/97 Treatment Plant Class: III
Classification changes within three miles:
Changes to WS-IV at the Dan River approximately 1 mile downstream.
22-30-(10)
Requested by:
Greg;Nizicl5 54i Date: 8/8/96
Prepared by:
Reviewed by:
IDS
Date: s i ti%
Gr tke \- Date:
Modeler
Date Rec.
#
nz.-
e-L\ c ; 1
o ek
Drainage Area (mi): 312
Average Streamflow (cfs): 362
s7Q10 (cfs): 75 w7Q10 (cfs): 131 30Q2 (cfs): 150
Toxicity Limits: Chronic (Ceriodaphnia) P / F 6 %
March, June, September, and December
Upstream Location:
Downstream Location:
Parameters:
SR 135
SR 2177
temperature, dissolved oxygen, pH, conductivity
Special instream monitoring locations or monitoring frequencies:
This area of the Dan River watershed is ideal for the formation of
an association of dischargers to perform instream monitoring.
Wasteflow (MGD):
BOD5 (mg/I):
NH3N (mg/I):
DO (mg/I):
TSS (mg/I):
Fecal Col. (/100 ml):
pH (SU):
Residual Chlorine (µg/I):
TP (mg/I):
TN (mg/I):
Temperature (°C):
Cadmium (µg/I):
Copper (µg/I):
Cyanide (µg/I):
Lead (µg/I):
Mercury (µg/I):
Zinc (µg/I):
Monthly Average
Summer
3.0
30
14
monitor
30
200
6- 9
28 Daily Maximum
monitor
monitor
monitor
34.0 Daily Maximum
monitor
monitor
monitor
0.21 Daily Maximum
monitor
Winter
3.0
30
monitor
monitor
30
200
6- 9
28
monitor
monitor
monitor
34.0
monitor
monitor
monitor
0.21
monitor
There shall be no discharge of floating solids or visible foam in other
than trace amounts.
,J�

Facility Name:
NPDES No.:
Type of Waste:
Facility Status:
Permit Status:
Receiving Stream:
Stream Classification:
Subbasin:
County:
Regional Office:
Requestor:
Date of Request:
Topo Quad:
FACT SHEET FOR WASTELOAD ALLOCATION
Request #
Mayodan Waste Water Treatment Plant
NC0021873
Domestic - 86 %
Existing
Renewal
-Dan Rivci
C
03-02-02
Rockingham
Winston - Salem
/ 9;650 ✓�
B 19 NW
%y1'37
Industrial - 14 %
Wasteload Allocation Summary
(approach taken, correspondence with region, EPA, etc.)
8504
Stream Characteristic:
Drainage Area (mi2):
Summer 7Q10 (cfs):
Winter 7Q10 (cfs):
Average Flow (cfs):
30Q2 (cfs):
IWC (%):
. .?Dept. of EHNR
O CT 2 9 1996
312
75
131
362
150
5.8 %
Very spotty submission of effluent metals DMR's.
This area of the Dan River is ideal for the formation of an association of dischargers to perform
instream monitoring. Request Region comment as to whether this and other facilities in area
would be interested in forming such an association.
Special Schedule Requirements and additional comments from Reviewers:
n1 o
*9m/ a rtetwa 1 ih5fruuam mane ism f , -��/. i/Af �r eornnu n.dL
Recommended by-�=-
Farrell Keoug
Instream Assessment: 4A- \='%
Regional Supervisor.
Permits & Engineering:
9/
to
pH M6Ni-to1UNc1,
dc� $o cofo2 pCub »- I"J.
VAN) kw- - ioPa NEcci
Tire- Avoccuo+104 (I'
�oc ,Gcl� fi ►vn,vt6x,
%,5pA a- . 4/4 Ike
J/ DA UC AMO Lie Dk c .. .
Date: �3 Ocs'v8xz, 1116
Date: 1 01��{
Date: /0
Date: 70M,
RETURN TO TECHNICAL SERVICES BY: '' i', 2 3�� 7"

Existing Limits:
Wasteflow (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):
Temperature (°C):
Cadmium (14/1):
Chromium (µg/1):
Copper (µg/1):
Cyanide (14/1):
Lead (µg/1):
Mercury (1.tg/1):
Nickel (14/1):
Silver (µg/1):
Zinc (4/1):
CONVENTIONAL PARAMETERS
Monthly Average
Summer
3.00
30
14
monitor
30
200
6-9
28
monitor
monitor
monitor
monitor
monitor
monitor
monitor
monitor
monitor
monitor
monitor
monitor
Monthly Average
Winter
3.00
30
monitor
monitor
30
200
6-9
28
monitor
monitor
monitor
monitor
monitor
monitor
monitor
monitor
monitor
monitor
monitor
monitor
There shall be no discharge of floating solids or visible foam in other than trace amounts.
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/1):
TP (mg/1):
TN (mg/1):
Temperature (°C):
Cadmium (14/1):
Chromium (µg/1):
Copper (µg/1):
Cyanide 4g/1):
Lead (14/1):
Mercury (1g/1):
Nickel (µg/1):
Silver (µg/1):
Zinc (4/1):
Monthly Average
Summer
3.00
30
14
monitor
30
200
6-9
-- 28 E --' 67Mu{ nvoc)
monitor
monitor
monitor
34.3 (Ph'', 4140
not required
monitor
monitor
monitor
0.21 (17i1)
not required
not required
monitor
Monthly Average
Winter
3.00
30
monitor
monitor
30
200
6-9
28
monitor
monitor
monitor
34.3
not required
monitor
monitor
monitor
p.2
not required
not required
monitor
There shall be no discharge of floating solids or visible foam in other than trace amounts.
Xicb i'1'1on�. Wirt r corYii'r itcuc/ n,/-lt1",. l/(k -r 1 !1/4/ -
2 r -i'� `� x r`ca,444". vr� I�T ,► I C itSs J� «�%1 1 / < < l YYt UY
C — X7

Cadmium:
Chromium:
Copper:
Cyanide:
Lead
Mercury:
Nickel:
Silver:
Zinc:
Maximum Predicted
Allowable
Maximum Predicted
Allowable
Maximum Predicted
Allowable
Maximum Predicted
Allowable
Maximum Predicted
Allowable
Maximum Predicted
Allowable
Maximum Predicted •
Allowable
Maximum Predicted
Allowable
Maximum Predicted
Allowable
Type of Toxicity Test:
Existing Limit:
Recommended Limit:
Monitoring Schedule:
Upstream Location:
Downstream Location:
Parameters:
561 9 out of 10 samples below detection of 1.0 µg/1
34.3 maximum value of 31 µg/1 in April, 1996 -if-
9 8 out of 10 samples below detection of 2.0 µg/1
856 maximum value of 3 µg/1 in May, 1996 and December, 1995
132 10 out of 10 samples above detection
120 maximum value of 60 µg/1 in May, 1996
11 8 out of 10 samples below detection of 5.0 µg/1
85.6 maximum value of 5 µg/1 in March, 1996 and March, 1995
225 9 out of 10 samples below detection of 2.0 j.tg/1
428 maximum value of 18 µg/1 in September, 1995
0.78 9 out of 10 samples below detection of 0.2 µg/1 •
0.21 maximum value of 0.3 14/1 in June, 1995 sk
0 10 out of 10 samples below detection of 10 11g/1
1,507
0 10 out of 10 samples below detection of 3.0 µg/1
1.03
819 10 out of 10 samples above detection
856 maximum value of 315 14/1 in May, 1996
TOXICITY TEST
Chronic (Ceriodaphnia) Toxicity P / F
6%
6%
March, June, September, and December
INSTREAM MONITORING REQUIREMENTS
SR 135
SR 2177
temperature, dissolved oxygen,(pH„6onductivity
Special instream monitoring locations or monitoring frequencie
VertA I€- � OR.C_ (Jame
a3 Actual
14(7
tNpir.
VAltkts — Na Inb c22oQ
C91°N 44-5 A,o
MISCELLANEOUS INFORMATION & SPECIAL CONDITIONS
Adequacy of Existing Treatment
Has the ffgility demonstrated the ability to meet the proposed new limits with existing treatment facilities?
Yes 1/ 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 updated evaluation of facility, including toxics spreadsheet, modeling analysisif modeled at
renewal, and description of how it fits into basinwide plan)
Additional Information attached? (Y or N) If yes, explain with attachments.

Facility Name Mayodan WWTP
Permit # NC0021873 Pipe # 001
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 is 6.0 % (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 Mar., Jun, Sep., and Dec. 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 t submit suitable test
results will constitute noncompliance with monitoring requirements.
7Q10 75 cfs
Permitted Flow 3.0 MGD Recommended •
IWC 6.0 %
Basin & Sub -basin 03-02-02
Receiving Stream Mayo River i
County Rockingham DateZ. txreere, rile ii
I!
QCL PIF Version 9/91
Farrf0 Keough

Facility Name:
NPDES No.:
Type of Waste:
Facility Status:
Permit Status:
Receiving Stream:
Stream Classification:
Subbasin:
County:
Regional Office:
Requestor:
Date of Request:
Topo Quad:
Request # 8504
Mayodan Waste Water Treatment Plant
NC0021873
86 % Domestic 14 % Industrial
Existing
Renewal Stream Characteristic:
Mayo River USGS #
C Date:
03-02-02 Drainage Area (mi2):
Rockingham Summer 7010 (cfs):
Winston - Salem Winter 7010 (cfs):
Nizich Average Flow (cfs):
8 / 8 / 96 30Q2 (cfs):
B 19 NW IWC (%):
312
75
131
362
150
5.8 %
1984: memorandums and letters outlining various needs, (i.e. standby power, fecal coliform limits, etc) at the facility
1986: modeled for flows of 0.700 and 1.250 mgd with secondary limits recommended
1991: two WLA's (1.250 and 3.0 mgd) w/ secondary limits, (plus chlorine for 3.0 mgd) and monitoring for various toxics
- note: a second file labeled Speculative WLA has both models and correspondence relating the secondary limits and lack o f nutrient
limits
Instream Monitoring
not yet required for flow of 1.250 mgd - will be recommended for 3.0 mgd
Toxicity Test
one failure over past four years in December, 1995 with a passing test the next month
very spotty submission of effluent toxics DMR's
Cadmium:
Chromium:
Copper:
Cyanide:
Lead:
Mercury:
Nickel:
Silver:
Zinc:
Max. Pred Cw
Allowable Cw
Max. Pred Cw
Allowable Cw
Max. Pred Cw
Allowable Cw
Max. Pred Cw
Allowable Cw
Max. Pred Cw
Allowable Cw
Max. Pred Cw
Allowable Cw
Max. Pred Cw 0
Allowable Cw 1,507
Max. Pred Cw 0
Allowable Cw 1.03
Max. Pred Cw 819
Allowable Cw 856
LTMP
561 9 out of 10 samples below detection of 1.0 µg/I
34.3 maximum value of 31 µg/I in April, 1996
9 8 out of 10 samples below detection of 2.0 µg/I
856 maximum value of 3 µg/1 in May, 1996 and December, 1995
132 10 samples above detection
120 maximum value of 60 µg/I in May, 1996
11 8 out of 10 samples below detection of 5.0 µg/1
85.6 maximum value of 5 µg/1 in March, 1996 and March, 1995
225 9 out of 10 samples below detection of 2.0 µg/I
428 maximum value of 18 µg/I in September, 1995
0.78 9 out of 10 samples below detection of 0.2 µg/I
0.21 maximum value of 0.3 µg/l in June, 1995
10 samples below detection of 10 µg/1
10 samples below detection of 3 µg/I
10 samples above detection
maximum value of 315 µg/1 in May, 1996
SIU's
Unifi Corporation
Effluent Considerations
dyed polyester yarn

1995 -1996 [ 1995 missing numerous months of DMR's for toxics j
Facility Name =
NPDES #
Ow (MGD) =
7Q1Os (cfs)=
IWC (%)
Mayodan WWTP
NC0021873
3.0 mgd
75 cfs
5.8 %
FINAL RESULTS
Cadmium Maximum Value 31
Max. Pred Cw 561
Allowable Cw 34.3
Chromium Maximum Value 3
Max. Pred Cw 9.0
Allowable Cw 856
Copper [Al] Maximum Value 60
Max. Pred Cw 132
Allowable Cw 120
Cyanide Maximum Value 5
Max. Pred Cw 11.0
Allowable Cw 85.6
Lead Maximum Value 18
Max. Pred Cw 225
Allowable Cw 428
Mercury Maximum Value 0.3
Max. Pred Cw 0.78
Allowable Cw 0.21
Nickel Maximum Value 5
Max. Pred Cw 0
Allowable Cw 1,507
Silver [AL] Maximum Value 1.5
Max. Pred Cw 0
Allowable Cw 1.03
Zinc [AL] Maximum Value 315
Max. Pred Cw 819
Allowable Cw 856
8/14/96

pPJnQ LL5(7.0
veibCt EA, ba, 02C- (JAni1c Lox ttcnl (-a10)1111-543") Ia/7J.1/
Parameter. Cadmium
Standard. 2 µgn
n BDL-1/2DL 'if 1/2 DL RESULTS
1 0.5 Sid Dev.
2 0 5 Mean
3 <31 Apr-96 C.V.
4
5
6
7
8
9
to
11
12
13
14
15
0.5
0.5
0.5
0.5
0.5
0.5
0.5
Parameter. Cyanide
Standard = 5 ILO
9.6
3.6
2.7
Mull Factor - 18.1
Max. Value 31 µgn
Max. Pred Cw 561 µgn
Allowable Cw 34.3 nil
n BDL-1/2DL 111/2 DL RESULTS
1 2.5 Std Dev. 1.1
2 2.5 Mean 3.0
3 2.5 C.V. 0.4
4 5 Mar-96
5 2.5
6 2.5 Mult Factor- 2.2
7 2.5 Max. Value 5 AO
8 2.5 Max. Pred Cw 11 µgn
9 2.5 • Allowable Cw 85.6 µg/I
10 5 Mar-95
11
12
13
14
15
>Parameter= Nickel
Standard . 88 µgn
n BDL.1/2DL 111/2 DL RESULTS
1 5 Std Dev. 0.0
2 5 Mean 5.0
3 5 C.V. 0.0
4 5
5 5
6 5 Mult Factor - 0
7 5 Max. Value 5 µgn
8 5 Max. Pred Cw 0 µgn
9 5 Allowable Cw 1,507 µgn
10 5
11
12
13
14
15
Parameter. Chromium
Standard. 50 µgn
n BDL.1/20L 111/2 DL RESULTS
t 1 • Std Dev. 0.8
2 3 May-96 Mean 1.4
3 1 • C.V. 0.6
4 1
5 1
6 3 Dec•95 Mutt Factor- 3.0
7 1 • Max. Value 3 µgn
a 1 Max. Pred Cw 9 KO
9 1 • Allowable Cw 856 µgn
10 1 •
11
12
13
14
15
Parameter. Lead
Standard . 25 µg/I
n BOL-1/2DL 111/2 DL RESULTS
t 1 Std Dev. 5.4
2 1 Mean 2.7
3 1 C.V. 2.0
4 1
5 1
6 1 • Mult Factor- 12.5
7 18 Sep-95 Max. Value 18 µgn
8 1 Max. Pred Cw 225 µgn
9 1 Allowable Cw 428 µgn
10 1
11
12
13
14
15
Parameter- Silver [AL]
Standard . 0.06 µg/I
n BDL-1/2DL 111/2 DL RESULTS
t 1.5 Std Dev. 0.0
2 1.5 Mean 1.5
3 1.5 C.V. 0.0
4 1.5
5 1.5
6 1.5 Mull Factor = 0
7 1.5 Max. Value 1.5 µgn
8 1.5 Max. Pred Cw 0 µgn
9 1.5 Allowable Cw 1.0 AO
10 1.5
11
12
13
14
15
Parameter. Copper [AI]
Standard . 7 µgn
n BDL.1/2DL 111/2 DL RESULTS
1 39 Sid Dev. 15.3
2 60 May-96 Mean 34.9
3 18 C.V. 0.4
4 22
5 15
6 38 Mult Factor. 2.2
7 53 Sep-95 Max. Value 60
a 37 Max. Pred Co 132
9 45 Allowable Cw 120
10 22
it
12
13
14
15
Parameter. Mercury
Standard . 0.012
µgn
n BDL.1/2DL If 1/2 DL RESULTS
t 0.1 Std Dev. 0.1
2 0.1 • Mean 0.1
3 0.1 C.V. 0.5
4 0.1
5 0.1
6 0.1 • Mult Factor- 2.6
7 0.1 • Max. Value 0.3
6 0.3 Jun-95 Max. Pred Co 0.8
a 0.1 Allowable Cw 0.21
to 0.1
11
12
13
14
15
Parameter. Zinc [AL]
Standard. 50
µgn
n BDL.1/2DL 111/2 DL RESULTS
1 212 Jun-96 Std Dev. 76.6
2 315 May-96 Mean 163
3 106 C.V. 0.5
4 167 Mar-96
5 66
6 240 Dec-95 Mult Factor - 2.6
7 83 Max. Value 315
8 152 Max. Pred Co 819
9 117 Allowable Cw 856
10 167
11
12
13
14
15
µgn
µgn
µgn

Page 1
Note for Farrell Keough
From: Bo McMinn
Date: Oct 21, 199611:45 AM
Subject: FW: LTMP's
To: Farrell Keough
Cc: Tom Poe
From: Bo McMinn on MonOct 211996 11:44 AM
Subject: RE: LTMP's
To: Tom Poe
Farrell,
Eden - Mebane Bridge - quarterly - Cd, Cr, Cu, Ni, Pb, Zn, Hg, Ag, Cn, As, Mo, SE
Eden - Dry Creek - same
Mayodan - Quarterly - As, Cd, Cr, Cu, Cn, Pb, Hg, Mo, Ni, Se, Ag, Zn
It is possible that May9odan may request to have the frequency reduced to one 4 day
monitoring period every five years so if you need more data than that would provide, I
suggest you require it in their permit.
From: Tom Poe on MonOct 211996 9:03 AM
Subject: FW: LTMP's
To: Bo McMinn; Mike Blasberg
Please. get this info to Ferrell, THANKS
From: Farrell Keough on Mon, Oct 21, 1996 09:01
Subject: LTMP's
To: Tom Poe
I need to know if the following facilites have LTMP's and what toxics will be monitored and
how often...
City of Eden - Dry Creek NC0025151
City of Eden - Mebane Bridge NC0025071
Town of Mayodan NC0021873
thanks

TOWN OF MAYODAN WWTP
Influent
To
Plant
Effluent
Sampler
Chlorine
Contact
Chamber
V\i/
To Stream
Influent
Bar
Screen
C12
Injector
Inf.
Pump
Station
Flow
Splitter
Box
Effluent
Flow
Meter
Aeration Basins
1.25 MGD Total
E Clarifier
Effluent To Stream
i
1
1
Control
Building
Generator
Room
To Drying Beds
Aeration Basin
1.75 MGD
Sludge
Pumping
Building
Sludge
Thickeners
Clarifier
Digester
(400,000 gals.)
C12/S02
Injector
Chlorine
Contact
Chamber
Pump
Building
Clarifier
Effluent
Flow
Meter
Sand
Drying
Beds

TOWN OF MAYODAN
N C0021873
SLUDGE MANAGEMENT PLAN
The Town of Mayodan WWTP has an aerobic digester with a volumetric
capacity of 0.4 MGD and 10 sand drying beds. Each of the beds can
accommodate approximately 18000 cubic feet (200' x 20' x 4.5') of dried
sludge. The Town of Mayodan has a Land Application Permit (WQ0002672)
which permits a total of 197.6 acres. The sludge may be land applied in either
a liquid or dried form.

cc: Permits and Engineering
Technical Support Branch
County Health Dept.
Central Files
WSRO
SOC PRIORITY PROJECT: Yes No X
If Yes, SOC No.
To: Permits and Engineering Unit
Water Quality Section
Attention: Greg Nizich
Date: 960827
NPDES STAFF REPORT AND RECOMMENDATION
County Rockingham
Permit No. NC0021873
PART I - GENERAL INFORMATION
1. Facility and Address: Town of Mayodan WWTP
210 W. Main Street
Mayodan, N.C. 27027
2. Date of Investigation: 960826
3. Report Prepared by: David Russell, Environmental Specialist
4. Persons Contacted and Telephone Number: Jamie Whitten (910)
427-5733
5. Directions to Site: From Bus. 220 in Mayodan travel Hwy 135
east approximately 1 mile, turn right on Cardwell Rd., WWTP
is at the end of the road.
6. Discharge Points(s), List for all discharge points:
Latitude: 36° 24' 00" Longitude: 79° 57' 20"
U.S.G.S. Quad No. B19NW U.S.G.S. Quad Name Mayodan
7. Site size and expansion area consistent with application?
X Yes No If No, explain:
8. Topography (relationship to flood plain included):
Treatment works are above the flood plain.
9. Location of nearest dwelling: None within 1000' of WWTP.

10. Receiving stream or affected surface waters:
Mayo River
a. Classification C
b. River Basin and Subbasin No.: 030202
c. Describe receiving stream features and pertinent
downstream uses: Approximately 1 1/2 miles below the
discharge the Mayo River enters the Dan River. The Dan
River (WS III) is a water supply for Eden several miles
downstream.
Part II - DESCRIPTION OF DISCHARGE AND TREATMENT WORKS
1. a. Volume of Wastewater to be permitted: 3.0 MGD (Ultimate
Design Capacity)
b. What is the current permitted capacity of the Waste
Water Treatment facility? 3.0 mgd
c. Actual treatment capacity of the current facility
(current design capacity)? 3.0 mgd
d. Date(s) and construction activities allowed by previous
Authorizations to Construct issued in the previous two
years.
e. Please provide a description of existing or
substantially constructed wastewater treatment
facilities; Bar screen influent pumps, aeration
basins, clarifiers, digestors, sludge storage basins,
drying beds, chlorination, dechlorination,flow meters.
f. Please provide a description of proposed wastewater
treatment facilities.
g•
Possible toxic impacts to surface waters:
h. Pretreatment Program (POTWs only):
in development approved X
should be required not needed
2. Residuals handling and utilization/disposal scheme:
a. If residuals are being land applied, please specify DEM
Permit No. WQ0002672.
Residuals Contractor: Southern Soil Builders
NPDES Permit Staff Report
Version 10/92
Page 2

Telephone No.
b. Residuals stabilization: PSRP PFRP
Other
c. Landfill:
d. Other disposal/utilization scheme (Specify):
3. Treatment plant classification (attach completed rating
sheet) . '33.4:
4. SIC Code(s): 4952
Primary 01 Secondary 55
Main Treatment Unit Code: 0 5 0 3
PART III - OTHER PERTINENT INFORMATION
1. Is this facility being constructed with Construction Grant
Funds or are any public monies involved. (municipals only)?
2. Special monitoring or limitations (including toxicity)
requests: None
3. Important SOC, JOC or Compliance Schedule dates: (Please
indicate)
Submission of Plans and Specifications
Begin Construction
Complete Construction
Date
4. Alternative Analysis Evaluation: Has the facility evaluated
all of the non -discharge options available. Please provide
regional perspective for each option evaluated. NA
Spray Irrigation:
Connection to Regional Sewer System:
Subsurface:
Other disposal options:
5. Other Special Items:
NPDES Permit Staff Report
Version 10/92
Page 3

PART IV - EVALUATION AND RECOMMENDATIONS
The WWTP has been recently upgraded to a 3.O mgd WWTP.
The new treatment units became operational in May 1996. The
system is very well operated and limits are consistently met.
Recommend that the permit be reissued.
((a-,-/.
p_t7
-ignature of report preparer
/221
:Water Quality Region
Supervisor
Date
NPDES Permit Staff Report
Version 10/92
Page 4

TOWN OF MAYODAN WWTP
A9Lt& ivvv
Influent
To
Plant
Effluent
Sampler
Chlorine
Contact
Chamber
Influent
Bar
Screen
Cl2
Injector
Inf.
Pump
Station
Flow
Splitter
Box
Effluent
Flow
Meter
Effluent To Stream
Aeration Basins
1.25 MGD Total
Control
Building
Generator
Room
To Drying) Beds
Aeration Basin
1.75 MGD
Clarifier
Sludge
Pumping
Building
Sludge
Thickeners
To Stream
Digester
(400,000 gals.)
C121S02
Injector
Chlorine
Contact
Chamber
Pump
Building
Clarifier
Effluent
Flow
Meter
Sand
Drying
Beds

North Carolina Division of Environmental Management
Water Quality Section / lMensivq Survey Gaup
December 13, 1994
}
MEMORANDUM
To: Ruth Swvanek*"/.
Through: Jay Sather
From: Howard Bryant got
Subject: Long-term BOD Analysis forMayodan WWTP
DAY
0
5
10
1.5
20
25
30
35
•40
50
•60
70
• 80
• 90
• 100
• 110
• 120
160
Udal
0.14
• 6.06 0.57
• 9.01 . 0.50
.13.15 0.18
.15.95 0.07
. 18.37
• 20.15
• 21.79
• 23.03
• 25.63
• 27.99
• 30.18
32.26
34.06
36.05
- 37.83
• 39.59 0.09
• 44.59
Date Collected: June 21, 1994
0800-0900
cc: Central Files
Regional Water Quality Supervisor
LAU71nt.h.
tPEC 19 1994
.�
4.. r rL ti r `t�t1 .t.
County: Rockingham
NPDES # NC0021873
Receiving Stream: Mayo River
Sub -basin: 030202
DWI tipai
1.6 4.00
3.0 4.00
2.0 4.10
1.4 4.20
1.9 5.30
5.f
7.0
6.1
5.6
7.2
1i
PRop,sg) E,c91:43a19'4 601
lvOC. ti3.610
TOTgI Rg.-td•0141
ctornu 3 •S 1-57-
QcnxnomA 6. 0 / i 6.3
• DMAA(D 3 rrvscs 6 -off
coovees lob TAG S }
0.13 1.2 5.20 6.4 }o� dt*cloa E 3011
• 04N1Y1raifoN 6.0:
c oNVc 5 ►' j CA cfmr..
• disc,
0.05 1.6 5.50 7.1 6.o 'T"S (Alonti -7
AffrimoNI4 4.0 * 6.0 ,51s
0.12 2.0
5.50 7.5
0.8 5.40 6.2
Collected by: Mickey
pH: 7.5
0.ol9
eoD,4 - H 3.051
•
Test evaluation: excellent
Seeded: seeded
nip (5•4- ti-D)# 4.5- C. •
coop (WS-OSy- 6.3) = 3 6 • 3�
T
3s•4Sy
3005
/6.06
J

Mayodan Waste Water Treatment Plant
NC0021873 Mayo River 03-02-02
6.00 mgd
59.0 7010
359 Gave
Parameter Standard Allowable Concentration Detected
µ9A µO µ9n
Arsenic 50.0 368
Cadmium 2.0 15
Chromium 50.0 368
Copper 7.0 51
Cyanide 5.0 37
Lead 25.0 184
Mercury 0.012 0.088
Nickel 88.0 647
Selenium 5.0 37
Silver 0.1 0.44
Zinc 50.0 368
Phenols 1.0 1
Chlordane 0.575 ng/l 4 ngll • 0.3 µfill [Total Chbrdanej
Endrin 2.0 ng/l 15 ng/I • 0.03 µot
Heptachlor 0.280 ng/l 2 ngA • 0.02 Ky4
Heptachlor Epoxide - •
Lindens 10.0 ng/l 74 ngll
Methoxychior 30.0 ngA 221 ngll
Toxaphene 0.2 mil 1 ngA • 1.5 1gyl
o - Cresol 13.4 99 Federal
m, p - Cresol - -
2,4 - Dinitrotoluene 0.11 4 Federal c
Hexachbrobenzene 0.00075 0 • 0.01 1&gf Federal c
Hexachlorobutadiene 0.445 3
Hexachloroethane 1.9 75 Federal c
Nitrobenzene 17 125 Federal
Pentachlorophenol 0.28 11 Federal c
Pyridine - -
2,4,5 - Trichlorophenol 1 7 Federal
2,4,6 - Trichlorophenol 2.1 83 Federal c
Benzene 1.19 9
Carbon Tetrachloride 0.254 2
Chlorobenzene 488 3590 chlorinated benzenes
Chloroform 5.7 226 Federal c
1,4 - Dichlorobenzene 2700 19862 Federal
1,2 - Dichioroethane 0.38 3 Federal
1,1 - Dichloroethene 0.057 2 Dichioroethytene Federal c
Tetrachloroethene 0.8 32 Tetrachloroethylene Federal c
Trichloroethene 2.7 107 Trichloroethylene Federal c
Vinyl Chloride 2 15
Methyl Ethyl Ketone - -
2,4 - D 100 736
Silvex 10 74
Calcium, Total 100 736 calcium carbonate
Magnesium, Total - -
Manganese, Total 200 1471
Sodium, Total - -
Barium 100 736
Bis (2-Ethylhexyl) Phthalate 5.9 234 Federal c
MBAS 500 3678
(Methylene - Blue - Active - Substance) • State Lab Detection Level

JERRY D. MYERS
County Manager
clPockin9Ia►n County
GOVERNMENTAL CENTER
WENTWORTH, NORTH CAROLINA 27375
March 9, 1994
Mr. Don Sarit
Assistant Chief of Technical Support
N. C. Department of Environmental Management
P. O. Box 29535
Raleigh, North Carolina 27626-0535
Dear Mr. Safrit:
F6ortil- rY1�rl�L
W1T� (
o3-oz-oZ-
371 NC 65, SUITE 206
REIDSVILLE, NC 27320-8815
TELEPHONE [phone]
FAX [phone]
Rockingham County is presently conducting a feasibility study for the development of a
regional wastewater collection and treatment system in the western area of the county.
In order to compare treatment plant siting options, we will need to know the effluent
limitations that would be set by the State for each option. Specifically we are
requesting the limits that would be set for permitted discharges of 3 MGD, 6 MGD, and
12 MGD located at:
1. The existing Town of Mayodan municipal plant discharge; and
2. The Dan River at the U. S. 220 crossing, downstream of the confluence of the
Dan and the Mayo.
As the conclusions of our study will depend on these limitations, we would appreciate
these six (6) sets of limits as soon as possible.
If you have any questions please contact Mike Hanna [phone] with Dewberry
and Davis, the engineering firm conducting this study.
MtodAO tiiJO MAC1t t
11E4 - /E-14c1L
Sincerely,
Iot-EmrAI(L, Pell ��l c5toN 1/'HF bUb tJmvwoc.-r7/
•
Myers,
RockiCounty Manager
JDM/pr