NC0026913_Wasteload Allocation_19880425

NPDES DOCIMENT SCANNING COVER :SHEET
NC0026913
Sparta WWTP
NPDES Permit:
Document Type:
Permit Issuance
(asteload
Allocation
Authorization to Construct (AtC)
Permit Modification
Complete File - Historical
Engineering Alternatives (EAA)
Correspondence
Owner Name Change
Meeting Notes
Instream Assessment (67b)
Speculative Limits
Environmental Assessment (EA)
Document Date:
April 25, 1988
This document its printed on reuse paper - ignore sixty
content on the reizerise side

PERMIT NO.: NCOO yi 3
FACILITY NAME-
NPDES WASTE LOAD ALLOCATION
Facility Status: t EXISTING PROPOSED
(circle one)
Permit S t a t u s: �RENE !AIA� MODIF7CATION UNPERM TED NEW
(circle one)
Major Minor
Pipe No- '1
Design Capacity (MGD): ' 250
Domestic (% of Flow): boo
Industrial (% of Flow):
Comments•
RECEIVING STREAM:
Class:
Sub -Basin- 5— d -3
Reference USGS Quad: �v' �� / NC (please attach)
County: fl-f/ i%any
Regional Office: As Fa Mo Ra Wa Wi
(circle ewe)
Requested By:
Prepared By:(,_etc.1
Reviewed
y:
Lvtla. /-tarr;.5 Date:
Da
Date:
Modeler
Date Rec.
Drainage Area (mil) 31 Avg. Streamflow (cfs)-
7Q10 (cfs) Winter 7Q10 (cfs) ' 30Q2 (cfs)
Toxicity Limits: IWC % (circle one) Acute / Chronic
Instream Monitoring:
Parameters
Upstream Location
Downstream Location
Effluent
Characteristics
Summer
Winter
BODE (mg/1)
90
NH3 N (mg/1)
N/
D.O. (mg/1)
N✓
TSS (mg/I)
3 0
F. Col. (/100m1)
/o d 0
pH (SU)
G - 7
DLOTTED
I
Comments•
- ,TOG
T
(g/0� e (It

�
-
I-
,
e
~
Permit Number
Facility Name
Type of Waste
Status
Receiving Stream
Stream Class
Subbasin
County
Regional Office
Requesto/'
Date of Request
DuatJ
Request No. :4516
WASTELOAD ALLOCATION APPROVAL FORM
NC0026913
TOWN OF SPARTA
DOMESTIC
EXISTING
LITTLE RIVER
C
050703
ALLEGHANY
WSRO
L. HARRIS
3/2/88
B14NE
Drainage Area
Average Flow
Summer 7010
Winter 7010
3002
RECOMMENDED EFFLUENT LIMITS
: EXIST.
Wasteflow (mgd): 0.250
5-Day BOD (MU/1): 30
Ammonia Nitrogen (mg/1): NR
Dissolved Oxygen (mg/1): NR
TSS (mg/1): 30
Fecal Coliform (0/100ml): 1000
PH (SU): 6-5
- MONITORING
Upstream (Y/N): N Location:
Downstream (Y/N): N Location:
(sq mi)
(cfs)
(cfs)
(cfs)
(cfs)
RECE!VED
EDv1ronmon�z.!i.z��J.)���
Winston-Sa!anj ,.U(MCe
---------------------------------- COMMENTS -------
*JOC RECENTLY COMPLETED FOR TOWN OF SPARTA (4/4/88)
Recommended by
Reviewed by:
Tech. Support Supervisor _
Regional Supervisor
Permits & Engineering __Q0
,'.,a Le
vats
RETURN TO TECHNICAL SERVICES
MAY 10 1988

,
�
�
SUMMER
MODEL SAVED ON HARDDISK
LBDATA?"SPARTA%*'
Discharger
Receiving Stream
---------- MODEL RESULTS
: TOWN OF SPARTA
: LITTLE RIVER
The End D.O. is 8.47 mg/l.
The End CBOD is 2.23 mg/l.
The End NBOD is 1.92 mg/l,
WLA w8'A WLA
DO Min CBOD NBOD DO Waste Flow
(mg/1) Milepoint Reach # (mg/1) (mg/1) (mg/1) (mgd)
Segment 1 7.56 0.00 1 .
Reach 1 45.00 90.00 0.00 0.25000

�
,
*** MODEL SUMMARY DATA ***
Discharger : TOWN OF SPARTA
Receiving Gtream : LITTLE RIVER
Summer 7Q10 : 18.
Design Temperature: 23.
Subbasin : 050703
Stream Class: C
Winter 7Q10 : 23.
|LENGTH| SLOPE! VELOCITY | DEPTH! Kd } Kd 1 Ka | Ka 1 KM | KN 1 XNR \ KNK |
} mile | ft/mi| fps | ft !design! a20" |dosign; 3200 |des gn! 320" !design! 3200 |
Segment 1 ( 6.201 23.001 0,630 1 1.41 | 0.42 | 0.37 20.11 ( 18.841 0.63 1 0.50 | 0.63 | 0.00 1
Reach 1 | | | |
| FlCBOD / NBOD | D.O. �
| cfs | mg/1 | mg/l | mg/l �
Segment 1 Reach 1
Waste � 0.388 | 45.000 � 90.000 � 0.000
Headwaters| 18.000 | 2.000 | 1.000 | 7.720
Tributary 0.000 | 2.000 | 1.000 | 7.720
* Runoff flow is in cfs/mile

SUMMER
MODEL SAVED ON HARDUISK
LSDATA? - SPARTAIP,
| Seg # | Reach # 1 Seg Mi 1 D.O. CBOD NBOD | Flow |
1 1 0.00 7.56 2.91 2.88 18,39
1 1 0.20 7.84 2.88 2.84 18.42
1 1 0,40 8,03 2.86 2.80 18.44
1 1 0.60 8.16 2.83 2.76 18.47
1 1 0'80 E.25 2.81 2.73 18.50
1 1 1.00 8.31 2.78 2.69 18.53
1 1 1.20 8.35 2.76 2.66 18.56
1 1 1.40 8.38 2.74 2.62 18.58
1 1 1.60 8.40 2.71 2'59 18.61
1 1 1.80 8.41 2.69 2.55 18.64
1 1 2.00 8'42 2.67 2.52 18.67
1 1 2.20 8.43 2.64 2.49 18.70
1 1 2.40 8.43 2.62 2.46 18.72
1 1 2.60 8.44 2.60 2.42 18.75
1 1 2.80 8'44 2.58 2.39 18.78
1 1 3.00 8.44 2.55 2.36 18.81
1 1 3,20 8.45 2.53 2.33 18.84
1 1 3.40 8.45 2.51 2.30 18.86
1 1 3'60 8.45 2.49 2.27 18.89
1 1 3.80 8.45 2.47 2.24 18.92
1 1 4.00 8.45 2.45 2.21 18'95
1 1 4.20 8.45 2.43 2.18 18.98
1 1 4.40 8.4b 2.41 2.15 19.00
1 1 4.60 8.46 2.39 2.13 19.03
1 1 4'80 8.46 2.37 2.10 19.06
1 1 5.00 8.46 2.35 2.07 19.09
1 1 5.20 8.46 2.33 2.05 19.12
1 1 5.40 8.46 2.31 2.02 19.14
1 1 5'60 8.46 2.29 1.99 19.17
1 1 5.80 8.47 2.27 1.97 19.20
1 1 6.00 8.47 2.25 1.94 19.23
1 1 6.20 8.47 2.23 1.92 19.26
| Seg # | Reach # | Seg Mi | D.O. CBOD 1 NBOD | Flow

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Discharger:
Stream Name:
INSTREAM .SELF -MONITORING DATA
MONTHLY AVERAGES
Permit Number: NCO() Z49/3
Sub -basin:
Upstream Location: /6O Downstream Location:
Month/Year
Upstream
/Y1Y
Downstream
TEMP D.O. BOD5 COND. TEMP D.O. BOD5 COND.
DEC-87
NOV-87
OCT-87
SEP-87
AUG-87
JUL-87
JUN-87
MAY-87
APR-87
MAR-87-
FEB-87
JAN-87
DEC-86
NOV-86
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MAY-86
APR-86
MAR-86
FEB-86 i:
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JUL-85 /9 -7, 1 I z4) 7, , 2.-
JUN-85 , 48 ' , 2.0 3 id 3
MAY-85 /7 AV i /7 8,7 3
APR-85 --L- _LI- / // /6 41
MAR-85 10 9, 2 - - /0 L2). _1_
_ _ FEB-85 ._....5_ —77 . —3— _A_ -
JAN-85 3 - -7-- 3
-1-•-•

DIVISION OF ENVIRONMENTAL MANAGEMENT
April 4, 1988
MEMORANDUM
TO: Larry Coble
THRU: Trevor Ciemen s
Steve Tedder
FROM: 04414.1loy
SUBJECT: Instream Assessment of Town of Sparta Discharge (87-10)
NPDES 11 NC0O26913
Alleghany County
Summary and Recommendations
The Town of Sparta has requested a first-time JOC to increase the flow
of its WWTP by 23,000 GPD. The impact of this increase in wasteflow on
dissolved oxygen concentrations in the Little River was evaluated using
Technical Support's Level B modeling framework. The results of the analysis
indicate that the requested flow increase will have very little additional
impact on the stream and that EMC criteria will be satisfied. As future
reference, our evaluation also determined that the maximum amount of waste -
flow for the Sparta WWTP will be 1.05 MGD. Any additional wasteflow above
1.05 MGD will cause a "significant impact" of more than 0.5 mg/1 of D.O.
sag. However, since Sparta's plant design capacity is 0.25 MGD, Technical
Support recommends that future JOC allocations not exceed this level.
Note that two toxicity screens performed by DEM have demonstrated no
acute toxicity associated with Sparta's effluent. Therefore, toxicity was
not evaluated in this analysis.
Background Information
According to the Region, the 12-month average pre-JOC wasteflow for
Sparta's WWTP is 0.1961 MGD. The current JOC request is for 0.023 MGD,
which gives a post-JOC flow of 0.2191 MGD. The Region recognizes that the
Sparta WWTP is already permitted for 0.250 MGD, however the JOC is for the
period of the construction and upgrading of the facility when BOD and TSS
might exceed permit limits. In 1987, there were effluent water quality
violations for both parameters at the permitted wasteflow.

In July, 1987, the Technical Support Unit determined tha
coliform limit should be included in the Sparta permit. A t a fecal stf
monitoring data indicated daily effluent levels have been ashig of Sparta s
480,000/100 ml and have also been frequently elevated, high as
ause
ratio for Sparta is 47:1 and since wasteload allocation Bthe dilution
procedures
the inclusion of fecal limits when dilution ratios are less than6 require
7fecal coliform limit will be recommended to be included in thheeJOC. a
.
Anal sis
A Level B model was used to assess the impact of the tree
dissolved oxygen in the Little River. Model runs were completed
at plant on
MGD (pre-JOC), 0.2191 MGD (.1961 MGD + JOC flow), and 1.05 MGD (at 0.1961
acceptable wasteflow for Sparta WWTP).5 MGD (maximum
set for the suggested JOC limits for BON �e runs used waste concentrations
effluent concentration in 1987 of 17.5 mg/1� STable0 ll�d the maximum NHS-N
of all model runs, presents the results
Conclusion
In accordance with the EMC criteria for judging in -stream
model results demonstrate no significant depression of the • ream DO impacts, leeve
or extension of the zone of impact when the wasteflow is increased.vel
JN/gh
cc: George Everett
Kent Wiggins
Ken Eagleson

Table 1 Summary of JOC Analysis for Sparta's WWTP Effluent
Qw (MGD)
Treatment Level * D.O. Minimum **
Design capacity 0.250 Current 7.56
Pre-JOC flow 0.1961 JOC 7.59
JOC request 0.023 -
Pre-JOC + JOC request 0.2191 JOC 7.58
-
Maximum allowable flow 1.05 JOC 7.08
*
**
JOC Treatment Level: CBOD = 75 mg/1/NBOD = 78.75 mg/1
For all runs, the D.O. minimum occurs @ the outfall (milepoint 0.0)
Existing Limits Suggested JOC Limits
BOD5 30 mg/1 BOD = 50 mg/1
TSS 30 mg/1 TSS = 50 mg/1
pH 6-9 (S.U.) Fecal Coliform = 1000/100 ml
pH = 6-9 S.U.

Request Form for In -stream Assessment for 67B
NAME OF FACILITY ,--S rt -/ %--
COUNTY nll 'r f'(�,v c REGION W5 R. U
RECEIVING STREAM ,/' 7/e '4 . b'e,'
BACKGROUND DATA :
SUBBASIN
DESIGN FLOW ,2 $ O a AG'!7)
A. Why is SOC needed? (Facility is out of compliance with which
effluent limits?)
Pk,I-,f2--//9u.,. t,a,v w. // tiU / 9 con-,p/e77 % J /y /,
-POW .R..14CLa4
B. History of SOC requests:
1. Monthly Average waste flow
prior to any SOC / / 9 6 / - mgd
Time period averaged f A2 thru /2 /g9
2. Previously approved SOC's: /pa/I/
Date: flow: mgd
Date: flow: mgd
total of previously approved SOC flow: mgd
3. Flows lost from plant flow: mgd
(facilities that have gone
off line)
4. Current SOC request flow -, O Z ,3 mgd
5. Total plant flow post-SOC
(sum of original flow and
SOC flow minus losses)
6. Is this an accurate flow balance for plant? Why/why not?

C. Please attach DMR summary for past year for all permitted parame-
ters. If possible, include reports from previous years if
facility has been under SOC for more than a year.
CURRENT SOC REQUEST :
A. Request is for domestic or industrial waste? If it is a combin-
ation, please specify percentages.
B. What type of industry? Please attach any pertinent data.
C. The region proposes the following SOC limits:
BOD5 mg/1
NH3 /J O L- mg/1
DO /l/ 0 L. mg/1
TSS v mg/1
fecal coliform /V/p L #/100m1
pH ( 0 -- ?, SU
other parameters
D. What is the basis for these limits?
0 ' Ce3,-,-a-4.e., .,:edi "Zize<AL- .,-.;xc,
,,e,o-eLte le ,00e-, c7 ,
g 0 0 a--i 7:-c s 4-Z/z...--
i ' ' 1 - - 4 - e . Si-i- ./.4t-- "A.,/ p eet-t -.v,e -,Ze. -A,, .v-.;-d-.
,/-0-1 1.0%i-

^
SUMMER
MODEL FOR SPARTA WWTP @
PRE-SOC FLOW
---------- MODEL RESULTS --------
Discharger : TOWN OF 8PARTA
Receiving Gtream : LITTLE RIVER
The End D.O. is 8.47 mg/l.
The End CBOD is 2.46 mg/l.
The End NBOD is 1.53 mg/l.
Segment 1
Reach 1
DO Min
(mg/l)
7.59
Milepoint
0�.00
Reach #
1
WLA WLA WLA
CBOD NBOD DO Waste Flow
(mg /l) (mg/l> (n)g/l> (mgd)
75.00 78.75
0.00 0.19610

,
^
...
Discharger
Receiving Stream
---------- MODEL RESULTS
: TOWN OF SPARTA
: LITTLE RIVER
The End D.O. is 8.47 mg/l.
The End CBOD is 2.56 mg/l.
The End NBOD is 1.63 mg/l.
Segment 1
Reach 1
Milepoint
Reach #
0.00 J.
WLA
SUMMER
MODEL FOR {0'^
WLA WLA
/
(mgd}

. .., . MODEL SUMMARY DATA - •# #• #
Disc hai'"L 'r : T(JWN OF SPAR..1..
Receiving Stream : LITTLE RIVER
Summer 7QIO n .18..
Design Temperature: e~: 23.
Subba<^ i. n 150703
Stream Class: t:
Winter f fl .f. c) n 23.
:LENGTH! SLOPE: VELOCITY 1 DEPTH! Kd 1 Kd : Ka ! Ka : KN 1 KN s KNR KNR 1
: mile : ft/mil fps 1 ft ;design: 020' :design} 320' ;designs 320° :design:: 320' I
1 1
Segment 1 1 6.201 23.00: 0.6E9 1 1.41 1 0.42 1 0.37 120.07 1 18.$01 0.63 1 0.50 1 0.63 : 0.00
Reach 1 1 i 1 3
E Flow E CBOD 1 NBOD D.O.
1 cfs. 1 mg/1 mg/1 1 mg/1
Segment i"it 1 Reach 1
Was -' 040 75.000 1 78.750 , 0 000
Headwaters; 18.000 i 2.000 1.000 3 7.720
Tributary 1 0.000 I 2.000 i 1.000 i 7.720
• .t*. Runoff i 0.:1. 40 s R.000 1 i... 000 i '�7. '720
* Runoff flow is in c'#' .'•/m7. le

SUMMER
MODEL FOR SPARTA WWTP�W/ MA�.
T
LIy1�C° ��. ���^��
| Geg # | Reach # Seg Mi D.O. | CBOD NBOD | Flow
1 1 0.00 7.58 3.35 2.44 18.34
1 1 0.20 7.85 3.32 2.41 18.37
1 1 0.40 8.04 3.29 2.38 18.40
1 1 0.60 8.17 3.26 2.35 18.42
1 1 0.80 8.26 3.24 2.31 18.45
1 1 1.00 8.31 3.21 2.28 18.48
1 1 1.20 8.36 3..1. 2.26 18.51
1 1 1.40 8.38 3.15 2.23 18.54
1 1 1.60 8.40 3.12 2.20 18.56
1 1 1.80 8.42 3.10 2.17 18.59
1 1 2.00 8.43 3.07 2.14 18.62
1 1 2.20 8.43 3.04 2.11 18.65
1 1 2.40 8.44 3.02 2.09 18.68
1 1 2.60 8.44 2.99 2.06 18.70
1 1 2.80 8.44 2.96 2.03 18.73
1 1 3.00 B. 2.94 2.01 18.76
1 1 3.20 8.45 2.91 1.98 18.79
1 1 3.40 8.45 2.89 1.95 18.82
1 1 3.60 S. 2.86 1.98 J.
1 1 3.80 8.45 2.84 1.90 18.87
1 1 4.00 8.46 2.81 1.88 18.90
1 1 4.20 8.46 2.79 1.86 18.93
1 1 4.40 8.46 2.77 1.83 18.96
1 1 4.60 S. 2.74 1.81 18.98
1 1 4,80 8.46 2.72 1.78 19.01
1 1 5.00 8.46 2.70 1.76 19.04
1 1 5.20 8.46 2.67 1.74 19.07
1 1 5.40 8.46 2.65 1.72 19.10
1 1 5.60 8.47 2.63 1.70 19.12
1 1 5.80 8.47 2.60 1.67 19.15
1 1 6.00 8.47 2.58 1.65 19.18
1 1 6.20 8.47 2.56 1.63 19.21
� Seg # 1, Reach it. � Seg Mi D.O. CBOD NBOD Flow |

,o.
SUMMER
MODEL FORT SPRWAAAWIP`M/AM.^
---------- MODEL RESULTS --------------
TOWN OF SPARTA
Receiving Stream : LITTLE RIVER
______________________________________________________________________
The End D.O. is 8.30 mg/l.
The End MOD is 6.10 mg/l.
The End NBOD is 5.01 mg/l.
______________________________________________________________________
WLA WLA WLA
W-O` Z9OD / �NBQD� DO
(Mg/1) Milepoint Reach # (Mg/1) (mg/l) (mg/l} (mgd}
Segment 1 Ay""Mr, 0.00 1

*** MODEL SUMMARY DATA ***
Discharger ; TC3WN OF SPARTA
Receiving fivi.ng Stream �, LITTLE RIVER
Summer 7010 p 18.
Design Temperature: 23.
Sub:i i i lr"i Class:
i..�t. ea Clas s n C
Winter 7010 X 23.
!LENGTH; SLOPE VELOCITY 1 DEPTH; Kd 1 Kd 1 Ka 1 Ka 1 KN 1 KN 1 KNR 1 KNR
1 mile 1 ft/mil fps 1 ft !design: 8E0° !design! 220° !design! •3 0° 1design1 220° 1
Segment 1 1 6.201 23.001 0.661 1 1.42 1 0.43 1 0.38 121.10 1 19.761 0.63 1 0.50 0.63 1 0.00 1
Reach 1 1
Flow
1 c: f ':
Segment 1 Reach 1
Waste :l , 628
Headwaters: 18.000
Tributary 1 0..000
* Runoff 1 0.140
CJ3OD
75.000
2.000
2.000
2.000
N}3OD 1 D.O.
mg/1 1/ mg/1
1 78.750 ,
1 1.000 1
1 1.000 1
* Runoff f " :l o w is in c •f {::> / m . 1. e
0.000
'!.720
7.720
7.720

SUMMER
MODEL FOR SPAR -FA WWTP W/ MAX.
OW @ REC. SOC LIMITS
( Seg # | Reach # | Seg Mi D.O. CBOD | NBOD | Flow |
1 1 0.00 7.08 8.05 7.45 19.63
1 1 0.20 7.44 7.98 7.35 19.66
1 1 0.40 7.69 7.91 7.26 19.68
1 1 0.60 7.85 7.84 7.16 19.71
1 1 0.80 7.97 7.77 7.07 19.74
1 1 1.00 8.05 7.70 6.98 19.77
1 1 1.20 8.10 7.63 6.89 19.80
1 1 1.40 8.14 7.56 6.81 19.82
1 1 1.60 8.17 7.49 6.72 19.85
1 1 1.80 8.19 7.43 6.63 19.88
1 1 2.00 8.20 7.36 6.55 19.91
1 1 2.20 8.21 7.29 6.46 19.94
1 1 2.40 8.22 7.23 6.38 19.96
1 1 2.60 8.23 7.16 6.30 19.99
1 1 2.80 8.28 7.10 6.22 20.02
1 1 3.00 8.24 7.04 6.14 20.05
1 1 3.20 8.24 6.97 6.06 20.08
1 1 3.40 8.25 6.91 5.99 20.10
1 1 3.60 8.25 6.85 5.91 20.13
1 1 3.80 8.26 6.79 5.83 20.16
1 1 4.00 8.26 6.73 5.76 20.19
1 1 4.20 8.26 6.67 5.69 20.22
1 1 4.40 8.27 6.61 5.61 20.24
1 1 4.60 8.27 6.55 5.54 20.27
1 1 4.80 8.27 6.49 5.47 20.30
1 1 5.00 8.28 6.43 5.40 20.33
1 1 5.20 8.28 6.38 5.34 20.36
1 1 5.40 8.28 6.32 5.27 20.38
1 1 5.60 8.29 6.26 5.20 20.41
1 1 5.80 8.29 6.21 5.13 20.44
1 1 6.00 8.29 6.15 5.07 20.47
1 1 6.20 8.30 6.10 5.01 20.50
| Seg # ( Reach # | Seg Mi D.O. | CBOD NBOD Flow |