NC0021326_Wasteload Allocation_19940314

WDES DOCYNEMI' SCANNINL COVER SHEET
NPDES Permit:
NC0021326
Dobson WWTP
Document Type:
Permit Issuance
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Engineering Alternatives Analysis
201 Facilities Plan
Instream Assessment (67B)
Correspondence re: Mercury
Permit
History
Document Date:
March 14 1994
This document is prir►ted on reuse paper - ignore mw5r
content on the re,% erse side

NPDES WASTE LOAD ALLOCATION
(� W145
PERMri' NO.: NC0021326
PERNff= NAME:
FACILITY NAME:
Town of Dobson
Dobson Wastewater Treatment Plant
Facility Status: Existing
Permit Status: Renewal with Modification
Major
Pipe No.: 001
Minor 1�
Design Capacity: 0.16 : IGD
Domestic (% of Flow): 100 %
Industrial (% of Flow):
Comments:
RECEIVING STREAM: Cody Creek
Class: C
Sub -Basin: 03-07-02
Reference USGS Quad: B 16NW, Dobson (please attach)
County: Surry
Regional Office: Winston-Salem Regional Office
Previous Exp. Date: 5/31/94 Treatment Plant Class:
Classification changes within three miles: S-ri : (IN t '
Requested by: Susan A. Wilson Date: 1/6/94
Prepared by: t, Date:
Reviewed by: a&-d-t J Dated i t{ y
'Be Dw s$q W (SA) 6 o.Ilr "q 4 o.
V�b'L � 3
Modeler
Date Rec.
#
('.LA'S
t io 4
Drainage Area (mil) Q.'g Avg. Streamflow (cfs):_�
7Q10 (cfs) 0.1-7 Winter 7Q10 (cfs) 0, x 30Q2 (cfs) d •3 (,,
Toxicity Limits: IWC 4 % Acute/Chronic
Instream Monitoring:
Parameters L,- � e v Jt
Upstream a Location 40A- a%oJe.
Downstream_ Location f7<uT� /o01 .�f,��er
Wasteflow (MGD):
BODS (mg/1):
NH3N (mg/1):
DO (mg/1):
TSS (mg/1):
Fecal Col. V100 ml):
pH (SU):
Residual Chlorine (µg/1):
MBAS Qµg/1):
TP (mg/1):
TN (mg/1):
Comments:
Qw = 0.16 MGD
Monthly Average
Summer
Winter
0.16
0.16
30
30
2.0
4.0
5.0
5.0
30
30
200
200
6-9
6-9
monitor
monitor
843
843
monitor
monitor
monitor
monitor
Qw = 0.35 MOD
Monthly Average
Summer
Winter
0.35
0.35
30
30
2.0
4.0
5.0
5.0
30
30
200
200
6-9
6-9
22
22
657
657
monitor
monitor
monitor
monitor

NPDES WASTE LOAD ALLOCATION
PERMIT NO.
NCO021326
PERMI= NAME:
Town of Dobson
FACILITY NAME: Dobson Wastewater Treatment Plant
Facility Status: Existing
Permit Status: Renewal with Modification
Major _
Pipe No.:
Minor
001
Design Capacity:
0.35 MGD
Domestic (% of Flow):
Industrial (% of Flow):
Comments:
11 '.
RECEIVING STREAM: Cody Creek
Class: C
Sub -Basin: 03-07-02
Reference USGS Quad: B 16NW, Dobson (please attach)
County:_ Surry
Regional Office: Winston-Salem Regional Office
Previous Exp. Date: 5/31/94 Treatment Plant Class:
Requested by:
Prepared by:
Reviewed
Susan A. Wilson
Modeler
Date Rec.
#
14R4'l1l
Drainage Area (miz ) ('), K Avg. Streamflow (cfs):
7Q10 (cfs) o, 1-7 Winter 7Q10 (cfs) p, a-& 30Q2 (cfs) O, J
Toxicity Limits: IWC _`=f— % Acute/Chronic
Instream Monitoring:
Upstream YC6 Location
Downstream Ye S Location
Qw = 0.16 MGD
Monthly Average
Summer
Winter
Wasteflow (MGD):
0.16
0.16
BOD5 (mg/1):
30
30
NH3N (mg/1):
2.0
4.0
DO (mg/l):
5.0
5.0
TSS (mg/1):
30
30
Fecal Col. (/100 ml):
200
200
pH (SU):
6-9
6-9
Residual Chlorine (µg/1): monitor
monitor
MBAS (µg)1):
843
843
TP (mg/1):
monitor
monitor
TN (mg(1):
monitor
monitor
Comments:
Qw = 0.35 MGD
Monthly Average
Summer
Winter
0.35
0.35
30
30
2.0
4.0
5.0
5.0
30
30
200
200
6-9
6-9
22
22
657
657
monitor
monitor
monitor
monitor
W
061

RECEIVED
N.C. Dept. of EHNR
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 Dobson WWTP
NCO021326
Domestic - 100%
Existing
Renewal with Modification
Cody Creek
C
03-07-02
Surry
Winston-Salem
Susan A. Wilson
1/6/94
B16NW
Wasteload Allocation Summary
(approach taken, correspondence with region, EPA, etc.)
Request #
FEB - 4 1994
77Fi919M 4,al O#fiCO
Stream Characteristic:
USGS Hydro. Area
Calculation Method
Drainage Area (mi2):
Summer 7Q10 (cfs):
Winter 7Q10 (cfs):
Average Flow (cfs):
30Q2 (cfs):
IWC (%) - 0.16 mgd:
IWC (%):
HA10
Regional Equation
0.8
0.17
0.26
1.04
0.36
59.3
76.1
Facility wishes to expand to 0.35 mgd to alleviate flow problems caused by I & I. This WLA
outlines limits for the current design flow and the expanded flow. After expansion to 0.35 mgd the
stream will be 3/4 wastewater so adherence to effluent DO and ammonia limits will b4�3 imperitive.
Facility is currently under SOC for flow and ammonia.
Special Schedule Requirements and additional comments from Reviewers:
5:0. C, Issaao 2-/S'-73i Ex,01.ess oV 3-31-97
Recommended by: LIZZDater
Reviewed by �
Instream Assessment: L fA!! �'' Date: a 1
Regional Supervisor: Date:
Permits & Engineering:
RETURN TO TECHNICAL SERVICES BY: I41:1R O 3 199A

2
CONVENTIONAL PARAMETERS
Existine Limi
Monthly Average
Summer
Winter
Wasteflow (MGD):
0.16
0.16
BODS (mg/1):
30
30
NH3N (mg/1):
1.5
3.7
DO (mg/1):
5.0
5.0
TSS (mg/1):
30
30
Fecal Col. (/100 ml):
200
200
pH (SU):
6-9
6-9
Residual Chlorine (µg/1):
monitor
monitor
MBAS (µg/1):
843
843
TP (mg/1):
monitor
monitor
TN (mg/1):
monitor
monitor
Recommended Limits:
Qw = 0.16 MGD
Monthly Average
Summer
Winter
Wasteflow (MGD):
0.16
0.16
BODS (mg/1):
30
30
N113N (mg/1):
2.0
4.0
DO (mg/1):
5.0
5.0
TSS (mg/1):
30
30
Fecal Col. (/100 ml):
200
200
pH (SU):
6-9
6-9
Residual Chlorine (µg/1):
monitor
monitor
MBAS (µg/1):
843
843
TP (mg/1):
monitor
monitor
IN (mg/1):
monitor
monitor
Limits Changes Due To:
Change in 7Q10 data
Change in stream classification
Relocation of discharge
Change in wasteflow
Other (onsite toxicity study, interaction, etc.)
Instream data
New regulations/standards/procedures
New facility information
Qw = 0.35 MGD
Monthly Average
Summer
Winter
WQorEL
0.35
0.35
30
30
WQ
2.0
4.0
WQ
5.0
5.0
WQ
30
30
200
200
EL
6-9
6-9
22
22
WQ
'.(P5-)
&:57
WQ
monitor
monitor
monitor
monitor
X NH3N
_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.
Eem
No parameters are water quality limited, but this discharge may affect future allocations.

INSTREAM MONITORING REQUIREMENTS
Upstream Location: at least 100 ft. above outfall
Downstream Location: Hwy. 601 bridge
Parameters: Temperature, DO, Fecal Coliform, Conductivity
Special instream monitoring locations or monitoring frequencies:
MISCELLANEOUS INFORMATION & SPECIAL CONDITIONS
AdQuacy of Existing Treatment
Has the facility demonstrated the ability to meet the proposed new limits with existing treatment
facilities? Yes _ No X_
If no, which parameters cannot be met? FLot.) , 6116-N
Would a "phasing in" of the new limits be appropriate? Yes _ No X
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.

dvrr( ad�,0 6� ,tfir�e a� _
T65
S, b 7y- _ -
Do�✓/�
- / 01-7

"L,d --
f
'
WA
A
D,
� �J
!Co,gP& eb---

-1--._._- _�`.--------- ----- -- __ _
�u�-�------- ----

= lQolx Cd QuxC�cJ -
QLc,
CIO
QW =
Q°� Caw -f- Q k)
r

UDUa-13 a-U
Residual Chlorine
Ammonia as NH3
(summer)
7Q10 (CFS)
0.17
7010 (CFS)
0.17
DESIGN FLOW (MGD)
0.35
DESIGN FLOW (MGD)
0.35
DESIGN FLOW (CFS)
0.5425
DESIGN FLOW (CFS)
0.5425
STREAM STD (UG/L)
17.0
STREAM STD (MG/L)
1.0
UPS BACKGROUND LEVEL (UG/L)
0
UPS BACKGROUND LEVEL (MG/L)
0.22
IWC (%)
76.14
IWC (%)
76.14
Allowable Concentration (ug/1)
22.33
Allowable Concentration (mg/1)
1.24
Ammonia as NH3
(winter)
7010 (CFS)
0.26
Fecal Limit
2001100ml
DESIGN FLOW (MGD)
0.35
Ratio of 0.3 :1
DESIGN FLOW (CFS)
0.5425
STREAM STD (MG/L)
1.8
UPS BACKGROUND LEVEL (MG/L)
0.22
IWC (%)
67.60
Allowable Concentration (mg/1)
2.56
1/25/94

1fl"v,j
NPDES PRETREATMENT MF FORMATION REI� FORM
;FACILITY NAME: DCEL:1o,J WNTP NPDES NO. NC00
!RDQUES : S, WILSo� = i
i DATE: REGION: wsleD f
-------...,.• •-...�c.,uiw rttt;l'ttt�PLLbiENP ..
This facility has no SZUs and should not have pretreatment lam i
.i. This facility should and/or is developing a pretreatment 9uage.
Please include the folper'
lowing conditions:
i
' Program Development
i
Phase I due
Phase II due _
Additional Conditions
This facility is currently implementinga (attached) i
Please include the follow' Pretreatment program.
following conditions:
Program Implementation
Additional Conditions
(attached)
i S1TJ FLOW - TOTAL:
i
i
- COWOSITICN:
i PARAMETER
i
i Cd
Cr
i Cu
i Ni
i Pb
Zn
i CN
Phenol
M
{THROUGH
'ALLIM%ME
i
MM
i
i
TEXTILE: '
METAL FINISHING: :hSDMGD
OTHER: M(Z
i
hm
i
M '
MGD i
i
DAILY LDAD IN LBS/DAY ACTUAL
DG+ESTIC PEFMr= INDUSTRIAL % REMOvAL
REX EIVED: I //'% RbUIEWED A—J
RETURNED: L /Zj /

surumrjx
MODEL RESULTS
,Discharger
:
DOBSON WWTP
Receiving Stream :
CODY CREEK
The End D.O.
is 8.05
mg/l.
The End CBOD
is 6.28
mg/l.
The End NBOD
----------------------------------------------------------------------
is 1.32
mg/l.
WLA
WLA
WLA
DO Min
CBOD
NBOD
DO
Waste Flow
(mg/1)
-
Milepoint Reach #
- - - -
(mg/1)
(mg/1)
- - - -
(mg/1)
- -
(mgd)
- - - - - - - - - -
Segment 1
- - - - -
5.58
- - - - - - - - - - - -
0.00 1
- - - -
Reach 1
45.00
9.00
5.00
0.35000
Reach 2
0.00
0.00
0.00
0.00000
Reach 3
0.00
0.00
0.00
0.00000
Reach 4
0.00
0.00
0.00
0.00000

SUMMER
j Seg #
Reach #
Seg Mi
1
1
0.00
1
1
0.01
1
1
0.02
1
1
0.03
1
1
0.04
1
1
0.05
1
1
0.06
1
1
0.07
1
1
0.08
1
1
0.09
1
1
0.10
1
2
0.10
1
2
0.16
1
2
0.22
1
2
0.29
1
2
0.35
1
2
0.41
1
2
0.47
1
2
0.53
1
2
0.60
1
2
0.66
1
2
0.72
1
3
0.72
1
3
0.82
1
3
0.92
1
3
1.02
1
3
1.12
1
3
1.22
1
3
1.32
1
3
1.42
1
3
1.52
1
3
1.62
1
3
1.72
1
4
1.72
1
4
2.02
1
4
2.32
1
4
2.62
1
4
2.92
1
4
3.22
1
4
3.52
1
4
3.82
1
4
4.12
1
4
4.42
1
4
4.72
Seg #
Reach #
Seg Mi
D.O.
CBOD
NBOD
FLOW
5.58
34.74
7.09
0.71
5.73
34.59
7.07
0.71
5.87
34.45
7.04
0.72
6.00
34.30
7.02
0.72
6.12
34.16
7.00
0.72
6.23
34.02
6.97
0.72
6.33
33.87
6.95
0.72
6.42
33.73
6.93
0.73
6.50
33.59
6.90
0.73
6.58
33.45
6.88
0.73
6.65
33.31
6.86
0.73
6.65
33.31
6.86
0.73
6.95
32.49
6.70
0.74
7.15
31.69
6.55
0.76
7.27
30.93
6.41
0.77
7.36
30.19
6.27
0.78
7.42
29.47
6.13
0.79
7.46
28.78
6.00
0.80
7.49
28.11
5.87
0.81
7.52
27.46
5.75
0.83
7.54
26.83
5.63
0.84
7.56
26.22
5.51
0.85
7.49
11.99
2.86
2.06
7.62
11.77
2.80
2.08
7.70
11.56
2.74
2.10
7.76
11.35
2.68
2.12
7.80
11.15
2.62
2.14
7.83
10.95
2.56
2.15
7.85
10.75
2.51
2.17
7.86
10.56
2.45
2.19
7.88
10.38
2.40
2.21
7.89
10.20
2.35
2.23
7.90
10.02
2.30
2.25
7.90
10.02
2.30
2.25
7.93
9.53
2.17
2.30
7.95
9.08
2.04
2.36
7.97
8.65
1.93
2.41
7.98
8.25
1.82
2.47
8.00
7.87
1.72
2.52
8.01
7.51
1.63
2.57
8.02
7.18
1.54
2.63
8.03
6.86
1.46
2.68
8.04
6.56
1.39
2.74
8.05
6.28
1.32
2.79
D.O.
CBOD
NBOD
FLOW

*** MODEL SUMMARY DATA ***
Discharger : DOBSON WWTP
Receiving Stream : CODY CREEK
Summer 7Q10 : 0.17
Design Temperature: 25.0
Subbasin : 030702
Stream Class: C
Winter 7Q10 : 0.26
ILBNGTHI SLOPBI VBLOCITY I DBPTHI Kd I Kd I Ka I Ka I KN I KN I OR I KNR I SOD I SOD I
I We I f t/ai I fps I ft I design l @200 I design l 020° I desip l 0200 I design l 120° I design l @200 1
Seglent 1 1 0.101167.001 0.415 10.34 1 1.17 1 0.93 155.75 1 50.001 0.73 1 0.50 10.73 1 0.00 1 0.00 1 0.00 1
Reach 1 1 I I I I I I I I ! I I I
I I I I I I I I I I I I I I I
Segient 1 1 0.621 62.001 0.298 10.42 1 0.79 1 0.63 137.08 1 33.261 0.73 1 0.50 10.73 1 0.00 1 0.00 1 0.00 1
Reach 2
I I I I I I i l l i i l l l l
Segeent 1 1 1.001 35.001 0.276 10.72 10.48 1 0.39 119.36 1 17.371 0.73 1 0.50 1 0.73 1 0.00 1 0.00 1 0.00 1
Reach 3 1 I I I I I I I I I I I I
Segnent 1 1 3.001 35.001 0.289 10.76 1 0.48 1 0.38 120.28 1 18.191 0.73 1 0.50 1 0.73 1 0.00 1 0.00 1 0.00 1
Reach 4 1 I I I I I I I I I I I I
! Flow 1
CBOD 1
NBOD 1
D.O. I
1 cfs i
mg/l 1
mg/l 1
mg/l i
Segment 1
Reach 1
Waste
1 0.542 1
45.000 1
9.000 1
5.000
Headwatersl 0.170 1
2.000 1
1.000 1
7.440
Tributary
1 0.000 i
2.000 1
1.000 1
7.440
* Runoff
1 0.190 1
2.000 1
1.000 1
7.440
Segment 1
Reach 2
Waste
1 0.000 1
0.000 1
0.000 1
0.000
Tributary
1 0.000 1
2.000 1
1.000 1
7.440
* Runoff
1 0.190
1 2.000 1
1.000 1
7.440
Segment 1
Reach 3
Waste
1 0.000
I 0.000 1
0.000 1
0.000
Tributary
1 1.210 1
2.000 1
1.000 1
7.440
* Runoff
1 0.190 1
2.000 1
1.000 1
7.440
Segment 1
Reach 4
Waste
1 0.000 i
0.000 1
0.000 1
0.000
Tributary
1 0.000 1
2.000 1
1.000 1
7.440
* Runoff
1 0.180 1
2.000 1
1.000 1
7.440
* Runoff flow is in cfs/mile

WINTER
---------- MODEL RESULTS ----------
-Discharger : DOBSON WWTP
Receiving Stream : CODY CREEK
The End D.O. is 10.16 mg/l.
The End CBOD is 6.05 mg/l.
The End NBOD is -2-.63 mg/l.
----------------------------------------------------------------------
WLA
WLA
WLA
DO Min CBOD
NBOD
DO
Waste F1oW
(mg/1) Milepoint Reach # (mg/1)
w w w w w w w w w w w w w w w w w w w w w w
(mg/1)
(mg/1)
(mgd)
Segment
1
6.39 0.00 1
Reach
1
45.00
18.00
5.00
0.35000
Reach
2
0.00
0.00
0.00
0.00000
Reach
3
0.00
0.00
0.00
0.00000
Reach
4
0.00
0.00
0.00
0.00000

WINTER
Seg #
Reach #
I Seg Mi
D.O.
CBOD
NBOD
Flow
1
1
0.00
6.39
31.07
12.49
0.80
1
1
0.01
6.59
30.94
12.45
0.81
1
1
0.02
6.77
30.81
12.40
0.81
1
1
0.03
6.95
30.69
12.36
0.81
1
1
0.04
7.11
30.56
12.32
0.81
1
1
0.05
7.27
30.43
12.28
0.82
1
1
0.06
7.41
30.31
12.23
0.82
1
1
0.07
7.55
30.19
12.19--
0.82
1
1
0.08
7.68
30.06
12.15
0.82
1
1
0.09
7.80
29.94
12.11
0.83
1
1
0.10
7.91
29.82
12.07
0.83
1
2
0.10
7.91
29.82
12.07
0.83
1
2
0.16
8.50
29.10
11.81
0.85
1
2
0.22
8.90
28.41
11.55
0.86
1
2
0.29
9.17
27.75
11.31
0.88
1
2
0.35
9.36
27.11
11.08
0.90
1
2
0.41
9.50
26.50
10.86
0.91
1
2
0.47
9.59
25.91
10.64
0.93
1
2
0.53
9.65
25.34
10.43
0.95
1
2
0.60
9.70
24.79
10.23
0.96
1
2
0.66
9.74
24.26
10.04
0.98
1
2
0.72
9.77
23.75
9.85
1.00
1
3
0.72
9.45
9.54
4.07
2.88
1
3
0.82
9.63
9.41
4.02
2.90
1
3
0.92
9.76
9.29
3.97
2.93
1
3
1.02
9.85
9.17
3.92
2.96
1
3
1.12
9.92
9.06
3.87
2.98
1
3
1.22
9.97
8.95
3.82
3.01
1
3
1.32
10.00
8.83
3.78
3.04
1
3
1.42
10.03
8.72
3.73
3.07
1
3
1.52
10.04
8.62
3.69
3.09
1
3
1.62
10.06
8.51
3.65
3.12
1
3
1.72
10.07
8.41
3.60
3.15
1
4
1.72
10.07
8.41
3.60
3.15
1
4
2.02
10.10
8.11
3.48
3.23
1
4
2.32
10.11
7.83
3.37
3.31
1
4
2.62
10.12
7.57
3.26
3.40
1
4
2.92
10.13
7.32
3.16
3.48
1
4
3.22
10.14
7.08
3.06
3.57
1
4
3.52
10.14
6.85
2.96
3.65
1
4
3.82
10.15
6.64
2.87
3.73
1
4
4.12
10.15
6.43
2.79
3.82
1
4
4.42
10.16
6.23
2.71
3.90
1
4
4.72
10.16
6.05
2.63
3.99
Seg #
Reach #
I Seg Mi
D.O.
CBOD
NBOD
Flow

*** MODEL SUMMARY DATA ***
--V .
Discharger : DOBSON WWTP Subbasin : 030702
Receiving Stream : CODY CREEK Stream Class: C
'Summer 7Q10 : 0.16 Winter 7Q10 : 0.26
Design Temperature: 14.0
I LHRM I SLOH I HLOCITY I DIFTH I Id I Rd I Ka I xa I KN I U I FAR I UR I SOD I SOD I
I isle I ft/ii I fps I ft I design I 120° I design 16200 I design I 6200 I design I @20° I design I 020° 1
I I I I i l i l i l l l l l l
Segient 1 1 0.101167.001 0.455 10.35 1 0.75 1 0.99 143.88 1 50.001 0.32 1 0.50 1 0.32 1 0.00 1 0.00 1 0.00 1
Reach 1 1 I I I I I I I I I I I I
I I I I I i l i l l l i l l l
Sweat 1 1 0.621 62.001 0.332 10.43 1 0.51 1 0.67 132.53 1 37.061 0.32 1 0.50 10.32 1 0.00 1 0.00 1 0.00 I
Reach 2 1 I I I I I I I I I I I !
r....w......w.r.....ww....w.rrr.rrr.....wrr.r.rr........r....r.rrrrrrrrrrrr..wrr.r..w.r...r..w..r......r..rrrr.....
I I I I I i l l l l l l l i l
Segient 1 1 1.001 35.001 0.354 10.75 1 0.33 10.43 119.60 1 22.331 0.32 1 0.50 10.32 1 0.00 1 0.00 1 0.00 1
Reach 3 1 I I I ! I I I I I I I !
I I I I I i i i i l l l l l l
Segient 1 1 3.001 35.001 0.375 10.80 1 0.32 1 0.43 120.72 1 23.611 0.32 1 0.50 10.32 1 0.00 1 0.00 1 0.00 1
Reach 4 1 1 1 1 1 1 1 1 1 1 1 1 1
..r.rr.rr.rr..rr...rwrww.r.rrrrr.rrrrr.rrrr.rr.wrr..rrrrw.rrrr.r..r..rr.rrr..w.r.w..rrr.rrr......wr.r
I Flow 1
CBOD I
NBOD 1
D.O. I
I cfs
I mg/1
I mg/l I
mg/l I
Segment 1
Reach 1
Waste
1 0.542
145.000
1 18.000 1
5.000
Headwatersl 0.260
1 2.000
1 1.000 1
9.280
Tributary
I 0.000
1 2.000
1 1.000 1
9.280
* Runoff
I 0.270
i 2.000
1 1.000 1
9.280
Segment 1
Reach 2
Waste
I 0.000
1 0.000
I 0.000 I
0.000
Tributary
1 0.000
1 2.000
1 1.000 1
9.280
* Runoff
1 0.270
1 2.000
1 1.000 I
9.280
Segment 1
Reach 3
Waste
1 0.000
1 0.000
I 0.000 I
0.000
Tributary
I 1.880
I 2.000
1 1.000 1
9.280
* Runoff
1 0.270
1 2.000
1 1.000 1
9.280
Segment 1
Reach 4
Waste
I 0.000
I 0.000
i 0.000 I
0.000
Tributary
I 0.000
I 2.000
1 1.000 I
9.280
* Runoff
I 0.280
I 2.000
I 1.000 I
9.280
* Runoff flow is in cfs/mile

cc: Permits and Engineering
Technical Support Branch
County Health Dept.
Central Files
WSRO
JAN' K
SOC PRIORITY PROJECT: Yes X No _
If Yes, SOC No. 93-23
To: Permits and Engineering Unit
Water Quality Section
Attention: (Susan Wilson)
Date: January 20, 1994
NPDES STAFF REPORT AND RECOMMENDATION
County Surry
Permit No. NC0021326
PART I - GENERAL INFORMATION
1. Facility and Address: Dobson WWTP
Town of Dobson, P.O. Box 351, Dobson, NC 27017
2. Date of Investigation: January 19, 1994
3. Report Prepared by: Lee G. Spencer
4. Persons Contacted and Telephone Number: C.W. Newman, ORC
and Wayne Atkins, Town Manager [phone]
5. Directions to Site: From Winston-Salem take US 52 north to
the Hwy 268 exit in Surry County. Turn west and proceed
several miles to Rockford Road. Turn right and go until
road ends (ie., cross Hwy. 601). Turn right and proceed a
short distance to the first road on the left (just past the
High School). WWTP is at the end of this street.
6. Discharge Points(s), List for all discharge points:
Latitude: 36022'50" Longitude: 80°43'25"
U.S.G.S. Quad No. B16NW U.S.G.S. Quad Name Dobson
7. Site size and expansion area consistent with application ?
X Yes No If No, explain: Somewhat limited area.
8. Topography (relationship to flood plain included): The WWTP
sets in a level area well above the flood plain.
9. Location of nearest dwelling: None noted within _1000'.
10. Receiving stream or affected surface waters: Cody Creek
a. Classification: C
b. River Basin and Subbasin No.: 03-07-02
C. Describe receiving stream features and pertinent

downstream uses: Creek flows through mostly rural
agricultural areas.
Part II - DESCRIPTION OF DISCHARGE AND TREATMENT WORKS
1. a. Volume of Wastewater to be permitted: (Ultimate Design
Capacity) 0.35 MGD per Application; 0.32 MGD per ------
Engineering Report
b. What is the current permitted capacity of the Waste
Water Treatment facility? 0.16 MGD
C. Actual treatment capacity of the current facility
(current design capacity)? 0.16 MGD based on past
staff reports and permits dating back to 1988.
d. Date(s) and construction activities allowed by previous
Authorizations to Construct issued in the previous two
years. No A/C found in file. Plans due to be
submitted by March 31, 1994, per SOC.
e. Please provide a description of existing or
substantially constructed wastewater treatment
facilities: Manual bar screen/comminution, influent
lift station, "single donut -style" extended aeration
unit with integral clarifier, chlorination, and
chlorine contact chamber. Sludge handling facilities
consisting of a small, circular aerobic digester and
drying beds.
f. Please provide a description of proposed wastewater
treatment facilities: Fine screening, influent lift
station, dual extended aeration units with integral
clarifiers, UV disinfection and cascade post aeration.
Sludge handling facilities consisting of aerobic
digesters, decant/storage tank, alkaline
stabilization/storage tank and transfer/loading unit.
g. Possible toxic impacts to surface waters: None known.
h. Pretreatment Program (POTWs only): N/A
2. Residuals handling and utilization/disposal scheme:
a. If residuals are being land applied, please specify DEM
permit no. WQ0003796.
b. Residuals stabilization: PSRP * PFRP Other
3. Treatment plant classification (attach completed rating
sheet): Class II - Before Upgrade; Class III - After Upgrade
NPDES Permit Staff Report
Version 10/92
Page 2

4. SIC Code(s): 4952
Primary 01 Secondary
Main Treatment Unit Code: 0 5 0 x 3
PART III - OTHER PERTINENT INFORMATION
1. Is this facility being constructed with Construction Grant
Funds or are any public monies involved. (municipals only)?
Public funds were used to construct existing facility. Per
the Dobson Board of Commissioners the proposed facility will
be financed from funds of the Town, allocations from Surry
County and sale of -bonds. (Manager indicated that State
Revolving Loan Fund may be used.)
2. Special monitoring or limitations (including toxicity)
requests: None.
3. Important SOC, JOC or Compliance Schedule dates: Note: SOC
was signed by Mayor of Town on 11-29-93. State has yet to
sign SOC..
Date
Submission of Plans and Specifications 03-3 -1 94
Begin Construction 03-31-95
Complete Construction 09-30-96
4. Alternative Analysis Evaluation: N/A
5. Other Special Items:
PART IV - EVALUATION AND RECOMMENDATIONS
This system appeared to be reasonably well operated on the
date of the inspection. However, it was obvious that several
physical improvements are needed. Along with the plant upgrade,
it would be wise to conduct more I/I analysis and repair. In
addition, a telemetry system for the 9 lift stations and plant
would be a tremendous asset.
This office does not object to the reissuance of this permit
alonq current Division guidelines.
�- Zo -94-
Signature o report preparer Date
//-�'
Water Quality Region2X Supervisor Date
NPDES Permit Staff Report
Version 10/92
Page 3

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NCO021326-001
RECEIVING STREAM: Cody Creek
T + 525 33 M/. TO INTERSTATE 40 � 42'30" 527
e Stream Classification: C- 1
)iUSGS Quad. No. B16NW
n USGS Quad. Name: Dobson 5 MN GN 1 o loon
i County: Surry ' S
it 3•
- - ... .. .. .. .. �•- --- - ---- b2 MILS �•11' CONT(

1*1
RATING SCALE FOR CLASSIFICATION OF WATER POLLUTION CONTROL SYSTEMS
Name of Facility: Do,65,w&J, 0 0 /o
Owner or Contact Person: WAVAJ
Mailing Address: _XO &, x 3 s ,,
C-
County: S cc A,0Y' Telephone: (5 *1 o) 39 G Z
Present Classification: O e-Ass Z New Facility _Existing Facility=
NPDES Per. No. NCoo 2 /32 (P Nondisc. Per. No.WQ Health Dept.Per No.,_,_
Rated by: L- F t 6. 5°-g le el, Telephone: (yIC S" 6 -zoo Date:/ -
Reviewed by: Health Dept. Telephone:
Regional Office Telephone:5Y 704-7_
Central Office Telephone:
ORC _�&&4,d Z�,gas Grade: Telephone:
Check Classification(s): _ Subsurface Spray Irrigation _ Land Application
Wastewater Classification: (Circle One) I III iV Total Points: 0 crPG,eeG�'�
-------------------------------------------------------------
114-PLAM PROCESSES AND R ATED OOhTROL EDU PMEh 041CH ARE AN NTEGRAL PART OF NDLETRIeL. PR0DLICTION 9.1ALL NOT BE
CONSIDEBED ���Te TREATMENT EM 3hE d �eir�ec nc r+� dCC�C1r�AT1[Y� AM SFP� TAW SYSTEMS OONSIS ING-g=OF FMC TMK
\./V/IM71{JGTfCLJ �tr/'.r71 G TREATMENT � ��u � � ■ vr. � � ems. � we v ri•y sa
e Q r.P V Y WMIF1Cd= LINES ARE EXEMPT FROM CLASSIFICATION.
SUMURFACE CtASS1FMMM
(check all units that apply)
1`,_septic tanks
2._pump tanks
3,_____siphon or pump -dosing systems
4.__sand filters
5. grease traprinterceptor
6,,_o€Uwater separators
7,__gravfty subsurface treatment and disposal:
8,.pressure subsurface treatment and disposal:
SPRAY 1RPjmTtON cLASsIFIrATION
(check all units that apply)
1.__preliminary treatment (definition no. 32 j
2,__lagoons
9,___._septic tanks
4,_..__pump tanks
5._,_pumps
6,_,._sand filters
7.__grease traplinterceptor
8,_oiVwater separators
9.__disinfection
10. chemical addition for nutrient/algae control
11. _—spray irrigation of wastewater
in addition to the above classifications. pretreatment of wastewater in excess of these components shall
be rated using the point rating system and will require an operator with an appropriate dual certification.
LAND APPLICATIONIRESIDUALS CLASSIFICATION (Applies only to permit holder)
I. _Land application of biosolids, residuals or contaminated soils on a designated site.
WASTEINATERTREATMBJT FACIUTYCLASSIFrATION
The following systems shall be assigned a Class I classification, unlass the flow is of a significant quantity or the technology Is unusually
comptex. to require consideration by the Commission on a case -by -case basis: (Check H Appropriate)
1. _OiVwater Separator Systems consisting only of physical separation. pumps and disposal;
2 _Septic Tank/Sand Filter Systems consisting only of septic tanks, dosing apparatus, pumps .sand biters. disinfection
and direct discharge;
8L _Lagoon Systems consisting only of preliminary treatment. lagoons, pumps. disinfection, necessary chemical treatment for
algae or nutrient control, and direct discharge;
4. _Closed -loop Recycle Systems;
S. _Groundwater Remediatlon Systems consisting only of oiftater separators. pumps, air -stripping, carbon adsorption, disinfection
and dispo-.W;
6... _ Aquaculture operations with discharge to surface waters;
7- _Water Plant sludge handling and back -wash water treatment;
8. Seafood processing consisting of screening and disposal.
9.-Singlo-family discharging systems, with the exception of Aerobic Treatment Units, will be classified if permitted after July I.
1993 or H upon Inspection by the Division, it is lound that the system is not being adequately oporatod or maintained. Such
systems will be notified of the classification or reclassification by the Commission, in writing.

or ratin wastewater treatment facilities: (circle appropriate points)
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TOTAL POINTS.ww«wwwwNwwwwwwNwwwwwNwNNNwN
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Facfibles having a rating of one through four points. Inclusive, do not require a cerilifed operator.
Facilities having an activated sludge process will be assigned a minimum classification of Class IL
Faciiities having treatment processes for the removal of metal or cyanide will be assigned a minimum classification of Class IL
Faciib€es having treatment prooesses for the biological removal of phosphorus will be assigned a minimum classification of Class ill.
----------- ------ ------- ----------------------------------------
D004 DEFINITIONS
The following definitions shall appiyy throughout this Subchapter.
(1) Activated Carbon Beds. A physlcalkhemtcal method for reducing soluble organic material from wastewater effluent; The cotumn-type beds used In this
method will have a lbw rate varying from two to eight gallons per minute per square foot and may be either upfiow or downflow carbon beds. Carbon may or
may not be regenerated on the wastewater treatment plant site;
(2) Aerated Lagoons. A basin In which all solids are maintained in suspension and by which biological oxidation or organic matter is reduced through artificially
accelerated transfer of oxygen on a flow -through basis;
(3) Aeration A process of bringing about intimate contact between air or high purfty oxygen In a liquid by spraying, agitation or diffuslon;(3a) Extended
Aeration. An activated sludge process utilizing a minimum hydraulic detention time of 18 hours.
(4) Agriculturally managed site. Any site on which a crop Is produced, managed. and harvested (Crop Includes grasses. grains, trees. etc.);
(5) Air Stripping. A process by which the ammonium ion Is first converted to dissolved ammonia (pH adjustment) with the ammonia then released to the
atmosphere by physical means; or •other similar processes which remove petroleum products such as benzene. toluene. and xylene;
(6) Carbon Regeneration The regeneration of exhausted carbon by the use of a tumace to provide extremely high temperatures which volatilize and oxidize the
absorbed impuritlw.
(7) Carbonaceous Stage. A sL-2ge of wastewater treatment designed to achteve 'secondary' effluent amhr,
(8) Centrifuge. A mechanical device In which centrifugal force Is used to separate solids from liquids or to separate liquids of different denslaas;
(9) Chemical Addition Systems- The addition of chemical(s) to wastewater at an application point for purposes of Improving solids removal, pH adjustment.
alkalinity control. etc.; the capability to experiment with different chemicals and dIfferenl application points to achieve a specific result wig be considered one
system; the capability to add chemical(s) to dual units will be rated as one system; capability to add a chemical at a different application points for different
purposes will result In the systems being rated as separate systems;
(10) Chemical Sludge Conditioning. The addition of a chemical compound such as fine. ferric chloride. or a polymer to wet sludge to coalesce the mass prior to
its appgcation to a dewatering device;
(11) Closed Cycle Systems. Use of holding ponds or holding tanks for containment of wastewater containing inorganic. non -toxic materials from sand. gravel.
crushed stone or other similar operations. Such systems shag carry a maximum of two points regardless of pumping facilities or any other appurtenances;
(12) Combined Removal of Carbonaceous SOD and Nitrogenous Removal by Nitrification- A single stage system required to achieve permit effluent limits on 800
and ammonia nitrogen within the same biological reactor.
(13) Dechlorinatlon. The partial or complete reduction of residual chlorine In a liquid by any chemical or physical process;
(14) Denbrilication Process. The conversion of nitrate -nitrogen to nitrogen gas;