HomeMy WebLinkAboutNC0021873_Speculative Limits_19911126NPDES DOCUHENT !;CANNIN`: 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 Limit's')
Environmental Assessment (EA)
Document Date:
November 26, 1991
This document is printed on reuse paper - ignore a,ny
content on the reirerse side
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
Town of frlayodan WW1 ,
NC0021 �3
Domestic/Industrial
Existing
Speculative
Mayo River
C
03-02-02
Rockingham
Winston-Salem Regional Office
B19NW
Request # Spec
Stream Characteristic:
USGS #
Date:
Drainage Area (mi2):
Summer 7Q10 (cfs):
Winter 7Q10 (cfs):
Average Flow (cfs):
30Q2 (cfs):
IWC (%):
6SSZ s
RECEIVED
N.C. Dept. NRCD
NOV 1 1991
Winston-Salem
Regional Office
207059800
1991
312
75
131
362
150
5.8
Wasteload Allocation Summary
(approach taken, correspondence with region, EPA, etc.)
This is a speculative WLA for the Town of Mayodan WWTP proposed expansion from 1.25 MGD to 3.00
MGD. A level B constructed for the Town of Stoneville WWTP was used for this analysis. The model
was constructed to predict the results of an SOC (flow and TSS) for the Town of Stoneville WWTP. It
includes the towns of Stoneville and Mayodan on the Mayo River and Madison on the Dan River.
Updated for the increase in flow from Mayodan and new flow rates for the Mayodan area, the model
predicts no interaction between the Stoneville and Mayodan plants. The minimum DO concentration
predicted from the increase in flow from the Mayodan plant is 7.68 mg/1 at the discharge point (45 mg/1
CBOD) or 7.50 mg/1 at mouth of the Mayo River (60 mg/1 CBOD). It should be noted that the model
predicts a second DO sag downstream of the Madison plant and the Mayo river. This minimum is 7.33
mg/1 at mile 5.6 after the Mayo river at 45 mg/1 CBOD and 7.30 mg/1 at mile 6.00 after the Mayo river
at 60 mg/1 CBOD.
Special Schedule Requirements and additional comments from Reviewers:
Recommended by: Nikcia s 1J� Date: /o . 2.q. 9,
Reviewed by
Instream Assessment: Date: i Ul c;4 /�i /
Regional Supervisor: . ....Date:
Permits & Engineering: Date: (fi 31 it
Av 12 6,111A
RETURN TO TECHNICAL SERVICES BY:
2
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):
Zinc
Priority Pollutants
Recommended Limits:
Wasteflow (MGD):
BOD5 (mg/1):
NH3N (mg/1):
DO (mg/1):
TSS (mg/1):
Fecal Col. (/100 ml):
pH (SU):
Residual Chlorine (14/1):
Oil & Grease (mg/1):
TP (mg/1):
TN (mg/1):
Type of Toxicity Test:
Monitoring Schedule:
Recommended Limits
Cadmium (µg/1):
Chromium (µg/1):
Copper (µg/1):
Nickel (µg/1):
Lead (µg/1):
Zinc (µg/1):
Cyanide (14/1):
Mercury (µg/1):
Silver (µg/1):
CONVENTIONAL PARAMETERS
Monthly Average
Summer Winter
1.25
30
monitor
30
1000
6.0-9.0
monitor
monitor
monitor
monitor
monitor
Monthly Average
Summer Winter WQ or EL
3.00 3.00
30 30 EL
14 monitor WQ
30 30 EL
200 200 WQ
6.0-9.0 6.0-9.0 EL
28 28 WQ
TOXICS/METALS
Chronic Toxicity (Ceriodaphnia) P/F at,5!g%
Quarterly; Oct, Dec, Mar, Jun
Daily Max. WQ or EL
monitor
monitor
monitor
monitor
monitor
monitor
monitor
menitor o. Z \+c) Q
monitor
Ckir)
�ZL
3
X Parameter(s) 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.
OR
No parameters are water quality limited, but this discharge may affect future allocations.
INSTREAM MONITORING REQUIREMENTS
Upstream Location:
Downstream Location: m
Parameters:
Special instream monitoring
135 Brid • _ - oint
outh o miles downstream of discharge point
, emperature, pH, Feca ' • ■� n 0 v e U! {'eGl
locations or monitoring frequencies: w D
110 s� • Pi. c o- d� P t 0,
MISCELLANEOUS INFORMATION & SPECIAL CONDITIONS
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.
P
E alike -AA L
.
-tetx„ e,s��� C\
. +A) Thoi-kk nn_ K wJ O O r lj
D
Fs'"' 9 �Ci •mil
Facility Name AtrIClak W 1k\f N(.Permit # dtb7ff 7 Pipe # do /
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 % (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
�1ec £L&i .-u.Yl . Effluent sampling for this testing shall be performed at the NPDES
pern?itted 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.
7Q10 %b cfs
Permitted Flow 3, a a MGD Recommended by:
Basin &Sub -basin o - ate. — aY'.kkp,o f irj
.A.veA
Date /o •2>, , 91
Receiving tream
County KocVvAr.\\
1
QCL PIF Version 9/91
/4e-cLal
� w O. CD 2 1�lla�
3 ycl.a.
rS 0+9th ~ -
1%ba s Ob yam Mari)
Bra:
1)3
a�.�O
Ahe
MC 44_436'0
ce-
� lei A.\ t, W vs`r
13," 0.2S 1-Lc,
cdeD4-Th 3f
1.64:1-sf.
Dan River Ambient Stations:
Station 1--Ambient station # 02068500 (Headwaters)
Station 2--Ambient station # 02071000 (Downstream from Mayo River)
Station 3--Ambient station # 02074518 (At Eden, NC)
Dissolved Oxygen Concentration (mg/1)
Date Stn. 1 Stn. 2 Stn. 3
88/01/26 12.60 11.80 12.00
88/02/16 12.00 11.80 11.40
88/03/17 12.00 11.40 9.80
88/04/13 10.20 9.80 9.00
88/05/09 9.00 8.40 7.70
88/06/13 8.80 8.10 6.10
88/07/12 7.40 6.60 6.80
88/08/09 7.70 6.80 6.50
88/09/06 8.80 8.00 7.60
88/10/05 10.00 8.80 9.40
88/11/14 11.60 11.00 10.20
88/12/06 13.20 12.40 13.60
89/01/12 12.20 12.20 12.80
89/02/09 12.60 12.00 11.60
89/03/21 11.20 10.80 10.00
89/04/18 10.20 9.60 9.40
89/05/15 9.60 8.80 9.00
89/06/13 8.60 8.40 8.60
89/07/17 8.40 8.00 8.40
89/08/08 9.10 7.80 7.80
89/09/19 8.60 8.20 8.60
89/10/11 10.20 9.60 8.40
89/11/13 10.80 10.60 10.00
89/12/27 13.00 12.80 12.80
90/01/17 10.60 10.60 11.00
90/02/13 11.20 10.60 10.40
90/03/14 9.60 8.80 9.60
90/04/11 9.60 9.20 9.20
90/05/14 9.60 8.80 8.80
90/06/13 9.40 8.60 7.80
90/07/17 8.60 8.40 7.60
90/08/15 8.00 7.60 7.40
90/09/24 10.20 8.20
90/10/15 10.00 10.00 9.80
90/11/13 11.00 10.40 10.60
90/12/06 12.20 11.00 11.20
91/01/14 11.40 11.00 11.20
91/04/16 9.20 8.80 8.80
Total Phosphorus (mg/1)
Date Stn. 1
81/04/09 0.050K
81/07/08 0.14
81/10/08 0.050K
82/01/21 0.050K
82/04/27 0.07
82/07/21 0.05
82/10/04 0.050K
83/01/25 0.06
83/04/19 0.04
83/07/11 0.06
83/10/17 0.03
84/01/17 0.02
84/04/17 0.04
84/07/02 0.10
84/10/04 0.03
85/01/22 0.02
85/04/22 0.03
85/07/11 0.43
85/10/10 0.04
86/01/07 0.01
86/04/02 0.01
86/07/23 0.06
86/10/09 0.02
Stn. 2
0.05
0.11
0.12
0.05
0.10
0.19
0.050K
0.08
0.05
0.07
0.07
0.04
0.09
0.09
0.06
0.02
0.05
0.06
0.04
0.03
0.02
0.04
0.07
Stn. 3
0.16
0.29
0.58
0.12
0.13
0.22
0.41
0.11
0.09
0.19
0.25
0.07
0.09
0.19
0.14
0.08
0.28
0.38
0.25
0.10
0.20
0.12
0.16
NPDES PRETREATMENT INFORMATION RFX?UEST FORM
FACTT .TTY NAME: { ow INe!,\11) o�n ,./t NPDES NO. NCOO L % 3
""
REQUESTER:X5-1/A, je DATE: cl / [ / 91 REGION: Oi1A N- k
PERMIT CONDITIONS COVERING PRETREATMENT
This facility has no SIUs and should not have pretreatment language.
This facility should and/or is developing a pretreatment program.
Please include the following conditions:
Program Development
Phase I due / /
Phase II due / /
Additional Conditions
(attached)
v This facility is currently implementing a pretreaLrent program.
Please include the following conditions:
Program Implementation
Additional Conditions
(attached)
SIGNIFICANT INDUSTRIAL USERS' (SIUs) CONTRIBUTIONS
SIU FLOW - TOTAL:
- COMPOSITION:
TEXTILE:
METAL FINISHING:
OTHER:
LJe K ' MGD
MGD
MGD
MigD
MGD
MGD
MGD
HEADWORKS REVIEW
PARAMETER
Cd
Cr
Cu
Ni
Zn
CN
Phenol
Other
PASS
'THROUGH DAILY LOAD IN LBS/DAY ACTUAL
'ALLOWABLE DOMESTIC PERMITTED INDUSTRIAL
?,, 55 7 Q 0
3.553
3,ss3 r.C6r.3
At
G'. o (( 54
50,141
- 6,40 e0
91,5,2
o,C36
CW3
0, o ►
REMOVAL
qic
RECEIVED: / / REVIEWED BY: I„ i►. kik
a c4- U11upg
RETURNED: / ( /q1
The SAS System 1
15:41 Friday, October 4, 1991
D
B
5
A
N
P
D
E
S
I
U
N
U
M
T F
P Y R
I P E
P E Q
E
M
C
D
L
1 NC0021873 0101 1 0 2 .0083191
2 NC0021873 0102 1 0 9 .0034013
3 NC0021873 0103 1 0 3 .0029023
D
B
S
M
C
N
L
M
H
G
L
M
A
G
L
M
C
R
L
.0069430
.0058506
.0032526
M
P
H
E
M N M
A O F
S L L
L L L
1 .0041908 .00016263 .0031900 .
2 .0047473 .00015838 .0067952 .
3 .0021017 .00017014 .0075227 .
M
B
0
D
L
M
C
U
L
M
N
I
L
M
P
B
L
M
Z
N
L
0.11434 0.011134 0.017889 0.09589
0.09845 0.016019 0.021297 0.25500
0.01007 0.004170 0.013928 0.02991
N!
C
0
D
L
M
T
S
S
L
M
T
0
L
U
M
F
L
0
W
. 20.5414 45.4113 8.8446 . 0.031500
. 31.0729 . 22.6249 . 0.064278
. 66.7617 . 87.5533 . 0.046000
The SAS System 2
15:41 Friday, October 4, 1991
NPDES=N00021873
Variable
Sum
PIPE
TYPE_
_FREQ
MCDL
MCRL
MCUL
MNIL
MPBL
MZNL
MCNL
MHGL
MAGL
MASL
MPHENOLL
MFLL
MBODL
MCODL
MTSSL
MTOLUL
MFLOW
3.0000000
0
14.0000000
0.0146227
0.0160463
0.2228631
0.0313230
0.0531142
0.3807936
0.0110399
0.000491143
0.0175080
118.3760626
45.4113000
119.0227879
0.1417778
10/07/91 ver 3.1
TOXIC S REVIEW
Facility: Town of Mayodan
NPDES Permit No.: NC0021873
Status (E, P, or M): E
Permitted Flow: 3.0 mgd
Actual Average Flow: 0.8 mgd
Subbasin: 030202
Receiving Stream: Mayo River I PRETREATME NT DATA I----EFLLUENT DATA ----
Stream Classification: C 1 ACTUAL PERMITTEDI
7010: 75.0 cfs I Ind. + Ind. + 1 FREQUENCY
IWC: 5.84 % 1 Domestic PERMITTED Domestic 1 OBSERVED of Chronic
Stn'd / Bkg 1 Removal Domestic Act.Ind. Total Industrial Total 1 Eflluent Criteria
Pollutant AL Conc. 1 Eff. Load Load Load Load Load 1 Conc. Violations
(ug/1) (ug/1) 1 % (#/d) (#/d) (#/d) (t/d) (#/d) 1 (ug/1) (#vio/#sam)
Cadmium S 2.0
Chromium S 50.0
Copper AL 7.0
Nickel S 88.0
Lead S 25.0
Zinc AL 50.0
Cyanide S 5.0
Mercury S 0.012
Silver AL 0.06
Selenium S 5.00
Arsenic S 50.00
Phenols S NA
NH3-N C
T.R.Chlor.AL 17.0
Pollutant
Cadmium S
Chromium S
Copper AL
Nickel S
Lead S
Zinc AL
Cyanide S
Mercury S
Silver AL
Selenium S
Arsenic S
Phenols S
NH3-N C
T.R.Chlor.AL
92% 0.00 0.0150 0.015
76% 0.05 0.0160 0.066
82% 0.06 0.2230 0.283
32% 0.02 0.0310 0.051
81% 0.05 0.0530 0.103
77% 0.16 0.3810 0.561
59% 0.04 0.0110 0.051
86% 0.0 0.0 0.001
94% 0.01 0.0180 0.028
0% 0.0
0% 0.0
0% 0.0
0% 0.0
0% 0.0
ALLOWABLE PRDCT'D PRDCT'D PRDCT'D
Effluent Effluent Effluent Instream
Conc. using using Conc.
Allowable CHRONIC ACTUAL PERMIT using
Load Criteria Influent Influent OBSERVED
(#/d) (ug/1) (ug/1) (ug/1) (ug/1)
10.27 34.258 0.18 42.7045 0.000
85.62 856.452 2.38 129.9164 0.000
15.98 119.903 7.65 97.7077 0.000 Monitor Monitor
53.18 1507.355 5.21 365.0316 0.000 Limit
54.08 428.226 2.94 12.5887 0.000 Monitor
89.34 856.452 19.39 128.9954 0.025 Monitor Monitor
5.01 85.645 3.14 26.5491 0.000 Monitor Limit
0.04 0.206 0.02 3.7503 0.000 Monitor Limit
0.41 1.028 0.25 1.3702 0.000 Monitor Monitor
2.05 85.645 0.00 0.0000 0.000
20.55 856.452 0.00 0.0000 0.000
0.000 0.00 0.0000 0.000
0.000 0.000
291.194 0.000
3.5530
3.5530
3.5530
3.5530
0.3910
3.5530
0.3910
0.2 2
0.1420
3.553
3.603
3.613
3.573
0.441
3.733
0.431
0.178
0.152
0.4
MONITOR/LIMIT I--ADTN'L RECMMDTN'S--
1 Recomm'd
Based on Based on Based on 1 FREQUENCY INSTREAM
ACTUAL PERMITTED OBSERVED 1 Eff. Mon. Monitor.
Influent Influent Effluent 1 based on Recomm'd ?
Loading Loading Data 1 OBSERVED (YES/NO)
(44J
A\\ Kerni v
Ci -f v mA)L
Monthly NO
A
N
A
L
Y
S
I
S
R
E
S
U
L
T
S
II
IlFacility:
IITown of Mayodan
IIReceiving Stream:
'Mayo River
II
II
1 I Summer
IINitrogen as NH3
II
II
II
II
II
Ammonia/Chlorine Worksheet
7Q10 (cfs):
Design Flow (MGD):
Design Flow (cfs):
Stream STD (mg/1):
IlBackground level (mg/1):
II IWC (%):
IlAllowable concentration
of NH3-N (mg/1):
II
IIWinter
IINitrogen as NH3
II
II 7Q10 (cfs): 131.000
II Design Flow (MGD): 3.000
II Design Flow (cfs): 4.650
II Stream STD (mg/1): 1.800
IlBackground level (mg/1): 0.220
II IWC (%): 3.428
IlAllowable concentration
II of NH3-N (mg/1): 46.31'2
II
Permit Number:
Modeler:
Date:
NC0021873
n jb
16-Oct-91
'Residual Chlorine
75.000 I 7010 (cfs):
3.000 1 Design Flow (MGD):
4.650 1 Design Flow (cfs):
1.000 1 Stream STD (ug/1):
0.220 (Background level (ug/1):
5.838 1 IWC (%):
(Allowable concentration
13.58101 of Chlorine (ug/1):
(Allowable concentration
I of Chlorine (mg/1):
II
II
II
II
II
II
II
II
II
II
75.000 II
3.000 II
4.650 II
17.000 II
0.000 II
5.838 II
II
291.194 'I
II
0.291 II
II
II
II
II
II
II
II
II
II
II
II
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DATE 9iii/
USGS FLow[bZv'N\ Data Request
Requested by: r.Sc
REQUEST No.. P"--
SITE No. 1 County g,eAirki harm River Basin R00,--nDke--
NRCD Sub Basin t.-W 2- Map Noor Name . 13J9 N o !&'ri
`�
Station No. z • �7O�` ?$ Secondary or Primary Road No.
Stream Name �a�a
Data Requested: Drainage Area 2._ Average Flower 30 Q 2 .2_
Winter 7 Q10 Summer 7 Q 10_4_
R
Alo fc
SITE No. 2 County
NRCD Sub Eosin Joao 2
0 Station No. -9- e7° ' • olsed
• Stream Name
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River 8asinLio-viftke-
Map No. or Name (3i NW 41exTLIA
Secondary or Rimary Road No.
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E Data Requested: Drainage Area Average Flow...L 30 Q 2
• Winter 791Re
10 _7kl_ Summer 70 10 X)
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•
N SITE No. 3 County River Basin
a
a
• NRCD Sub Basin Map No. or Name
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L Station No. Secondary or Primary Road
N
Stream Name
Note. when making a
Data Requested: Drainage Area
Winter 7 Q 10 Summer 7 Q 10
Average Flow 30 Q 2
725
/2
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3pped, edited, and published by the Geological Survey
ntrol by USGS and USC&GS
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REQUEST NO: 9202 SITE NO: 2 DATE: 9/25/91
SOURCE: NRCD ACTION: EXISTING STREAMFLOW CONDITION:
STATION NUMBER: 0207060800 TYPE STATION: 02
STATION NAME: MAYO R AT MTH NR MADISON, NC
LOCATION: AT SR 2177 AND 0.5 MI E OF MADISON, NC
LATITUDE: 362332 LONGITUDE: 795711
QUADRANGLE NUMBER: B19NW
COUNTY CODE: 157 STATE CODE: 37 DISTRICT CODE: 37
HYDROLOGIC UNIT CODE: 03010103 NRCD BASIN CODE: 030202
DRAINAGE AREA: 315.
AVERAGE FLOW: 362. RANGE: cfs to cfs Percent [B]
7Q10 MIN FLOW: 76. RANGE: cfs to cfs Percent [ ]
(SUMMER)
30Q2 MIN FLOW: 151. RANGE: cfs to cfs Percent [ ]
7Q10 MIN FLOW: 132. RANGE: cfs to cfs Percent [ ]
(WINTER)
7Q2 MIN FLOW: 132. RANGE: cfs to cfs Percent [ ]
NOTES:
[A] Estimate is based on records collected at or near the site. The range
indicates approximate interval in which the actual value may lie
[B] Estimate is based entirely on runoff observed at nearby streams.
[C] Because of the probable degree of inaccuracy of the estimate only
a range is given.
[D] Approximately.
Streamflow Condition Codes [R] Regulated [N] Natural
****** These data are provisional pending ay'soval by the Director,USGS ******
REMARKS:
REQUESTOR—BEDWELL
Data Index -- Entered by: AF
i
REQUEST NO: 9202 yE NO: 1 DATE: 9/25/91
SOURCE: NRCD ACTION: EXISTING STREAMFLOW CONDITION:
STATION NUMBER: 0207059800 TYPE STATION: 02
STATION NAME: MAYO R AT MAYODAN, NC
LOCATION: AT SR 135 AND 0.5 MI SE OF MAYODAN, NC
LATITUDE: 362426 LONGITUDE: 795757
QUADRANGLE NUMBER: B19NW
COUNTY CODE: 157 STATE CODE: 37 DISTRICT CODE: 37
HYDROLOGIC UNIT CODE: 03010103 NRCD BASIN CODE: 030202
DRAINAGE AREA: 312.
AVERAGE FLOW: 362 RANGE: cfs to
7Q10 MIN FLOW: 75. RANGE:
(SUMMER)
3002 MIN FLOW: 150. RANGE:
7Q10 MIN FLOW: 131. RANGE:
(WINTER)
7Q2 MIN FLOW: 131. RANGE:
NOTES:
cfs Percent [B]
cfs to cfs P5rPent [ ]
cfs to
cfs to
cfs Percent [ ]
cfs Percent [ ]
cfs to cfs PercentD_@]
[A] a3pimate)w based on 'reciRr^ collected at or near the site. The range
indicates approxz[<}yPintejvDl in which the actual value may lie
[B] Estimate is based entirely on runoff obsyTved at nearby streams.
[C] Because of the probable degree of inaccuracy of the estimate only
a range is given.
[D] Approximately.
Streamflow Condition Codes [R] Regulated [N] Natural
****** These data are provisional pending approval by the Director,USGS ******
REMARKS:
REQUESTOR--BEDWELL
Data Index -- Entered by: AF
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CONSULTING ENGINEER
1803 VANDORASPRINGS RD.
GARNER
NORTH CAROLINA
27529
PHONE 919.772.3511
September 5, 1991
State of. North Carolina
Department of Environment, Health,
and Natural Resources.
Division of ' Environmental Management
512 North Salisbury Street
Raleigh, North Carolina 27611
Attention Mr. Trevor Clements
Re: The Town of Mayodan, N. C.
Proposed Wastewater Treatment Plant Expansion
Dear Mr. Clements:
As I told you on the phone during our conversation a couple of
days ago, the Town of 'Mayodan proposes to expand its Treatment
Plant from a present capacity of 1.25 MGD to 3..00 MGD. This
move has been considered by the Town for some time, and is be-
coming a necessity because of the construction a year or so
ago of a new industry which has, essentially, received an al-
location from the Town for most of the remaining hydraulic
capacity of the existing Treatment Plant.
The present Treatment Plant was constructed under a Federal
and State grant program, and wasplaced into service on or
about November 30, 1987 The plant is currently being op-
erated under NPDES Permit Number NC 0021873. The Permit was
effective August 1, 1987 and expires on July 31, 1992 Copies
of pertinent data from this Permit are included herein for
your reference
4.4
SEP 0 :5 1991
I c FLFCf9 „ irU `PORT .BRANCH
In the year 1989, Mhcfield, Inc. made a decision to construct
a new facility on property near the Town of Mayodan and also.
near the Wastewater Treatment Plant The Nhcfield Plant was
constructed, and placed into operation sometime in August of
1990. The Town issued to Macfield, Inc. a permit to discharge
up to 700,000 GPD of wastewater into the Town's system. Mac -
field, Inc. was required to construct and place into operation
a pre-treatment facility, consisting of an Aeration Basin and
a Clarifier, along with necessary pumping equipment and : a
flume for metering of wastewater discharged into the Town's
system. The flow of waste from Macfield's pre-treatment
facility was to be at a fairly constant rate into the 'Town's
system to prevent "slugging" of the Town's Treatment Plant.
The full use of Macfield's allocated 700,000 GPD was not to.
be immediate, but was to allow for increased production aver
a period of time. With the change -out of same of the original
equipment, and the addition of some new machines, it is antici-
pated that the 700,000 GPD allowance will be used up in the
• PRINTED ON RECYCLED PAPER`
Mr. Trevor Clements Page two
next few months. Macfield, Inc. has requested that the. Town
expand its Treatment Plant to allow the allocation of ad-
ditional capacity forthem as soon as possible. This, plus
the desire to have some un-allocated capacity for waste
treatment to allow for normal growth and possible additional
industry, is the reason for the Town's desire to expand the
Treatment Plant.
Present average daily flaw to the Treatment Plant is on the
order of 700,000 GPD'. The make-up of the present flow is
estimated to be approximately 60% industrial and 40% com-
mercial and residential., The general characteristics of
the wastewater are included herein in the form of a monthly
report for the month of July 1991, the last such report
available at the time of this writing. Previous reports are
available in the files of your Central Office. From review
of a few monthly reports, it appears that the. Treatment. Plant
is consistently meeting Permit limits.
The exact amount. of the increased capacity which will be re-
quired by Macfield, Inc. is not defined at the present time.
Meetings with officials of Macfield, Inc, indicate a possible
total contribution of as much as 1.5 MGD for the Mayodan lo-
cation. This being the case, Macfield, Inc. would utilize.
800,000 GPD of the proposed expansion of 1.75 MGD., This
would leave slightly less than 1.00 MGD for normal growth
and possible other industrial uses in the future. It is
estimated that this would meet the needs of the Town for a
period of approximately 10 years,or until about the year
2000. An expansion to a total treatment capacity of 3..00
MGD would also equal the capacity of the Town's present
Water Treatment Plant.
The present Treatment Plant consists of Screening, Influent
Pumping, Aeration Basins, Clarifiers, Sludge Holding and
Pumping, Chlorination Equipment and Chlorine Contact Tank,
with effluent discharged to the Mayo River Sludge is
pumped to drying beds, and is land -applied as a means of
disposal. It is anticipated that the proposed addition to
the plant capacity would consist of, basically, the same
units in another train. Included herein for your reference
is a flow diagram showing the existing and proposed units
in the treatment process. Also included is a copy of a por-
tion of the OUEGS map "MAYODAN, N. C ." showing the location
of the Plant. The proposed expansion would be : entirely on
property currently owned by the Town of Mayodan, and desig-
nated for Wastewater Treatment Plant use. Existing and:
proposed structures are above the 100 year flood elevation
of the Mayo river at the Plant site.
Mr. Trevor Clements - Page three
It is anticipated that, with the construction of the addition
as planned, the Treatment Plant could be operated at five
different capacity levels; 0.625 MOD, 1.25 M D, 1.75 MGD,
2.375 MGD and 3.00 MOD. This flexibility of operation would
allow any or all of the Treatment Plant units to be utilized
as required by influent flow:
The Town requests a review of these data, and a determination
of the limits of discharge required for the Plant expansion
and theissuance of a new or revised NPDES Permit. If you
have questions or need additional information, please con-
tact the engineer at 919-772-3511. Thank you for your at-
tention to this matter.
Sincerely,
B. T..Bart, P. E.
Consulting Engineer.
BTH/h
Enclosures
cc: Mr. Jerry R. Carlton
Town Manager
Town of Mayodan, N. C.