NC0032115_Instream Assessment_19890710

DIVISION OF ENVIRONMENTAL MANAGEMENT
July 10, 1989
MEMORANDUM
TO: Roy Davis THRU: Trevor ClementsYn
f'or Tom Stockton 4RC
FROM: Jackie Nowell (�
SUBJECT: Instream Assessment for Town of Banner Elk WWTP
NPDES Permit No. NCO032115
Avery County
SOC Case No. 89-26
Summary
The Technical Support Branch has completed the instream assessment in
response to an SOC request for the Town of Banner Elk. The Town wants to
increase the flow of the plant by an additional 20,000 GPD of domestic was-
tewater with an interim increase in their effluent limitations for BOD5 and
TSS.
The impact of Banner Elk's WWTP wasteflow on dissolved oxygen (DO) lev-
els in the Elk River was evaluated using Technical Support's Level B mod-
eling framework. The results of this analysis indicate that the requested
wasteflow increase of 20,000 GPD and the interim SOC limits of 50 mg/1 of
BOD5 and 50 mg/1 of TSS will have very little impact on the stream and that
EMC approved 67(b) criteria will be satisfied. As future reference, our
evaluation determined that Banner Elk could increase their wasteflow by
80,000 GPD to design capacity of 0.330 MGD and not cause a significant
impact of more than 0.5 mg/l of DO sag or extend the streamlength predicted
to violate the DO standard by more than 0.5 miles.
We also recommend that the facility continue to perform chronic whole-
effluent toxicity monitoring on a quarterly basis.
Analysis and Discussion
The Town of Banner Elk discharges into the Elk River located in the
Watauga River Basin. The receiving stream has a stream classification of
C-Trout. U.S.G.S. flow data obtained in June, 1988 indicate the summer
7Q10 flow at the discharge point is 3.8 cfs, with a drainage area of 11
square miles and an average flow of 24 cfs. Background values for CBOD and
NBOD were derived from a Level B model completed for Sugar Mountain Utili-
ties in December, 1988. The Sugar Mountain WWTP, with the proposed expan-
sion to 1.0 MGD, discharges approximately 3 miles upstream of the Banner Elk
facility and the model ends just upstream of the Banner Elk outfall. The

model predicts the following instream values at the end of the run: CBOD =
8.45 mg/l; NBOD = 4.26 mg/l; and DO = 8.10 mg/l.
Facility compliance data for June, 1988 through April, 1989 report the
average monthly wasteflow as 0.250 MGD (pre-SOC flow). The amount of flow
requested by the SOC is 0.020 MGD. Therefore, the requested post-SOC flow
is 0.270 MGD with 50 mg/l of BODS and 50 mg/l of TSS. A fecal coliform
limit of 1000/100 ml has also been requested during the SOC period.
A Level B modeling analysis was used to assess the impact of the Banner
Elk WWTP discharge on dissolved oxygen in the receiving stream. A total of
three model runs were made: one at the pre-SOC flow (0.250 MGD), one at the
post-SOC flow (0.270), and one at design flow (0.330 MGD) . The waste input
for CBOD reflected the Asheville Regional Office's recommended BODS limit of
50 mg/l. Using a CBOD/BODS multiplier of 1.5 for 100% domestic waste, the
CBOD input was 75 mg/l. A waste input for NBOD was determined by using Ban-
ner Elk's maximum monthly NH3 value for the past year. The highest NH3
value was 24.6 mg/l in October, 1988; this yields an NBOD input of 110.7
mg/l (using an NBOD/NH3 multiplier of 4.5).
The model results at 0.250 MGD and 0.270 MGD predict DO minimums of 7.35
mg/1 and 7.30 mg/l, respectively. The minimums occur at the outfall in both
instances and reflect a difference of only 0.05 mg/l. The results of the
model run at the design flow of 0.330 MGD indicate a DO minimum of 7.14
mg/l. With a difference of only 0.21 mg/1 between DO minimums for the pre-
SOC flow and design flow run, this is considered an acceptable range and
meets the 67(b) criteria. Complete model results will be presented in
Table 1.
Effective in November, 1988, Banner Elk was required to meet a chronic
toxicity limit. A review of Banner Elk's toxicity test results indicate the
facility has failed five (5) of the last seven (7) tests. Regional staff
reports indicate that the facility's laboratory has been erroneously testing
their samples at an instream waste concentration (IWC) of 22%, instead of
the correct IWC of 12%. It is thought that the correction of this procedure
may improve the facility's testing record.
Recommendation
Based on the Level B Model results, Technical Support recommends
approval of 0.020 MGD additional wasteflow for the Banner Elk WWTP with the
SOC limits for BODS, TSS, fecal coliform, and pH. The continuation of quar-
terly chronic whole-effluent toxicity monitoring using an IWC of 12% is also
recommended. The SOC should be worded such that only wastewater of domestic
quality is added during the life of the order or until compliance is
achieved consistently with whole-effluent toxicity target concentrations.
cc: Steve Tedder
Ken Eagleson
Kent Wiggins
David Foster

Table 1. Instream Assessment for the Town of Banner Elk WWTP
Wasteflow Assumptions
Design Capacity 0.330 MGD
Pre-SOC 0.250 MGD
SOC Flow 0.020 MGD
Pre-SOC + SOC Flow 0.270 MGD
Model Input Summary
Headwater Conditions:
Summer 7Q10 3.8 cfs
Qavg 24.0 cfs
Design Temp. 23.0 °C
CBOD 8.45 mg/l
NBOD 4.26 mg/1
DO 8.10 mg/l
Wastewater Inputs:
1st Flow 0.250 MGD
2nd Flow 0.270 MGD
3rd Flow 0.330 MGD
CBOD(1.5*BOD5) 75.0 mg/1
NBOD(4.5*NH3) 110.7 mg/l
Model Output Summary
D.O. Net Distance
Qw Min. Change < 5.0 mg/l
(MGD)_ —(mg/1)_ ==(mg/1)=== ==(mi=)===
0.250 `7.35 ---- 0.0
0.270 7.30 0.05 0.0
0.330 7.14 0.21 0.0
Recommended SOC Limits
Qw 0.270 MGD
BODS 50 mg/1
TSS 50 mg/1
Fecal 1000 /100 ml
pH 6-9 SU

SUMMER
MODEL FOR BANNER ELK SOC : QW=
PRE-SOC FLOW & SOC LIMITS
---------- MODEL RESULTS ----------
Discharger• : TOWN OF BANNER ELK
Receiving Stream : ELK RIVER
-----------------------------------------------------------------------
The End D .O. is 8 . 18 mg/l .
The End CBOD is 9 . 88 mg/l .
The End NBOD is 9 . 56 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 7 . 35 0 . 00 1
Reach 1 75 . 00 110 . 70 0 . 00 0 . 25000
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
Reach 5 0 . 00 0 . 00 0 . 00 0 . 00000
Reach 6 0 . 00 0 . 00 0 . 00 0 . 00000
Reach 7 0 . 00 0 . 00 0 . 00 0 . 00000
Reach 8 45 . 00 90 . 00 0 . 00 0 . 08000

*** MODEL SUMMARY DATA ***
Discharger : TOWN OF BANNER ELK Subbasin 040201
Receiving Stream : ELK RIVER Stream Class : C-TR
Summer, 7Q10 : 3 . 8 Winter, 7Q10 : 6 . 0
Design Temperature : 23 . 0
ILENGTH1 SLOPEI VELOCITY I OEPTHI Kd I Kd I Ka I Ka I KN I KN I KNR I KNR I SOO I SOO I
I mile I ft/mil fps I ft Idesignl @201 Idesignl @201 Idesignl @201 Idesignl @20' Idesignl @201 1
•------------------------------- ------------------------------- --------------------------------------------------
I I I I I I I I I I 1 I I I I
Segment 1 1 0.161 95.001 0,447 1 0,79 1 0.62 1 0.54 153.37 1 50,001 0.63 1 0.50 1 0.63 1 0.00 1 0.00 1 3.00 1
Reach 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 I I
Segment 1 I 0.101 35,401 0.336 1 0.91 1 0.44 1 0.38 122.84 1 21.391 0.63 1 0.50 1 0.63 1 0.00 1 0.00 1 0.00 1
Reach 2 1 1 1 1 1 1 1 1 1 1 1 1 1
-------------------------------------------------------------------
I I I I I I I I I I I I I I
Segment 1 1 0.171 35.401 0,348 1 0.94 1 0.44 1 0.38 123.65 1 22,161 0.63 1 0.50 1 0.63 1 0.00 1 0.00 1 0.00 1
Reach 3 1 1 1 1 1 1 1 1 1 1 1 1 1
-------------------------------------------------------------------------------------------------------------------
I I I I I I I I I I I I I I I
Segment 1 1 0.151 35.401 0.362 1 0.97 1 0.44 1 0.38 124.65 1 23.091 0.63 1 0.50 1 0.63 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
-------------------------------------------------------------------------------------------------------------------
I I I I I I I I I I I I I I I
Segment 1 1 0,121 35.401 0,366 1 0.98 1 0.44 1 0,38 124.89 1 23,321 0.63 1 0.50 1 0.63 1 0.00 1 0,00 1 0.00 1
Reach 5 1 1 1 1 1 1 1 1 1 1 1 1 1
------------------ --------------------------- -------- ---------------------------------
I I I I I I I I I I I I I I
Segment 1 1 0,211 35,401 0.371 1 0.98 1 0.44 1 0.38 125.22 1 23.631 0.63 1 0.50 1 0.63 1 0.00 1 0.00 1 0.00 1
Reach 6 1 1 1 1 1 1 1 1 1 1 1 1 1
-- -------- -------------------------------------------------------------------------------------------------------
I I I I I I I I I I I I I I I
Segment 1 1 0.201 35.401 0.383 1 1.01 1 0.44 1 0.38 126.05 1 24.401 0,63 1 0,50 1 0.63 1 0.00 1 0.00 1 0.00 1
Reach 7 1 1 1 1 1 1 1 1 1 1 1 1 1
--------------------•----------------------------------------------------------------------------------------------
I I I I I I I I I I I I I I I
Segment 1 1 1,261 35.401 0.389 1 I.O1 1 0.44 1 0.39 126.46 1 24.791 0.63 1 0.50 1 0.63 1 0.00 1 0.00 1 0.00 1
Reach 8 1 1 1 1 1 1 1 1 1 1 1 1 1
----------------------------------------------- ------------------------------------------------
I Flow I CEOD I NBOD I D .O . I
I cfs I mg/l I mg/1 I mg/1 I
Segment 1 Reach 1
Waste 1 0 . 388 1 75 . 000 1110 . 700 1 0 . 000
Headwatersl 3 . 800 I 8 .450 1 4 . 260 1 8 . 100
Tributary 1 0 . 000 I 2 . 000 1 1 . 000 I 7 . 720
* Runoff 1 0 . 000 1 2 . 000 l 1 . 000 I 7 . 720
Segment 1 Reach 2
Waste 1 0 . 000 0 . 000 0 . 000 I 0 . 000
Tributary 1 0 . 000 I 2 . 000 1 . 000 I 7 . 720
nnn 1 9 nnn 11 - nnn 1 7 . 79n

Segment i Reach 3
waste 0 . 000 I 0 . 000 0 . 000 I 0 . 000
Tributary 0 .400 I 2 . 000 I 1 . 000 7 . 720
* Runoff 0 . 000 I 2 . 000 I 1 . 000 I 7 . 720
Segment 1 Reach 4
Waste I 0 . 000 I 0 . 000 I 0 . 000 I 0 . 000
Tributary I 0 . 500 I 2 . 000 1 . 000 I 7 . 720
* Runoff I 0 . 000 I 2 . 000 I 1 . 000 I 7 . 720
Segment 1 Reach 5
Waste 0 . 000 I 0 . 000 0 . 000 I 0 . 000
Tributary 0 . 150 I 2 . 000 I 1 . 000 I 7 . 720
* Runoff I 0 . 000 2 . 000 I 1 . 000 I 7 . 720
Segment 1 Reach 6
Waste I 0 . 000 I 0 . 000 0 . 000 0 . 000
Tributary I 0 . 150 2 . 000 I 1 . 000 I 7 . 720
* Runoff I 0 . 000 2 . 000 1 . 000 I 7 . 720
Segment 1 Reach 7
Waste I 0 . 000 I 0 . 000 I 0 . 000 I 0 . 000
Tributary I 0 . 500 ( 2 . 000 1 . 000 I 7 . 720
* Runoff I 0 . 000 I 2 . 000 1 . 000 I 7 . 720
Segment 1 Reach 8
Waste I 0 . 124 145 . 000 90 . 000 0 . 000
Tributary I 0 . 000 2 . 000 I 1 . 000 I 7 . 720
* Runoff I 0 . 000 2 . 000 1 . 000 7 . 720
* Runoff flow is in cfs/mile
i

SUMMER
MODEL FOR BANNER ELK SOC : QW=
POST-SOC FLOW & SOC LIMITS
-------- MODEL RESULTS ----------
Discharger, TOWN OF BANNER ELK
Receiving Stream ELK RIVER
-------------------------------------------------- --------------------
The End D .O. is 8 . 16 mg/l .
The End CBOD is 10 . 16 mg/l .
The End NBOD is 9 . 97 mg/l .
------------------------------------------ ----------------------------
WLA WLA WLA
DO Min CBOD NBOD DO Waste Flow
(mg/l ) Milepoint Reach # (mg/1 ) (mg/1 ) (mg/1 ) (mgd)
------ --------- ------- ---- ---- -- ----------
Segment 1 7 . 30 0 . 00 1
Reach 1 75 . 00 110 . 70 0 . 00 0 . 27000
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
Reach 5 0 . 00 0 . 00 0 . 00 0 . 00000
Reach 6 0 . 00 0 . 00 0 . 00 0 . 00000
Reach 7 0 . 00 0 . 00 0 . 00 0 . 00000
Reach 8 45 . 00 90 . 00 0 . 00 0 . 08000
1

*** MODEL SUMMARY DATA ***
Discharger, : TOWN OF BANNER ELK Subbasin 040201
Receiving Stream : ELK RIVER Stream Class : C-TR
Summer, 7ut10 : 3 . 8 Winter, 7G110 : 6 . 0
Design Temperature : 23 . 0
ILENOTHI SLOPEI VELOCITY I DEPTHI Kd 1 Kd I Ka I Ka I KN I KN I KNR I OR I SOD 1 SOD 1
I mile I ft/mi1 fps I ft Idesignl @201 Idesignl @201 Idesignl @201 Idesignl @201 desi9nl @201 1
-------------------------------------------------------------------------------------------------------------------
I I I I I I I I I I I I I I I
Segment 1 1 0.161 95.001 0.450 1 0.79 1 0.62 1 0.54 153.37 l 50.001 0.63 1 0.50 1 0.63 1 0.00 1 0.00 1 0.00 1
Reach 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 I I I
Segment 1 1 0.101 35.401 0.338 1 0.91 1 0.44 1 0.38 122.96 1 21.511 0.63 1 0.50 1 0.63 1 0.00 1 0.00 1 0.00 1
Reach 2 1 1 1 1 1 1 1 1 1 1 1 I 1
------------------------------•---------------------------------------------------------------------
I I I I I I I I I I I I I I I
Segment I 1 0.171 35.401 0.349 1 0.94 1 0.44 1 0.38 123.77 1 22.271 0.63 1 0.50 1 0.63 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 I I I I
Segment 1 1 0.151 35.401 0.364 1 0.97 1 0.44 1 0.38 124.16 1 23.191 0.63 1 0.50 1 0.63 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
-----------------•-------------------------------------------------------------------------------------------------
I I I I I I I I I I I I I I I
Segment 1 1 0,121 35.401 0.368 1 0.98 1 0.44 1 0.38 125.00 1 23.421 0.63 1 0.50 1 0.63 1 0.00 1 0.00 1 0.00 1
Reach 5 1 1 1 1 1 1 1 1 1 1 1 1 1
---------------------------------------------
I I I I I I I I I I I I I I I
Segment 1 1 0,271 35.401 0.372 1 0.98 1 0.44 1 0.38 125.33 1 23.731 0.63 1 0.50 1 0.63 1 0.00 1 0.00 1 0.00 1
Reach 6 1 1 1 1 1 1 1 1 1 1 1 1 1
-------------------------------------------------
I I I I I I I I I I I I I I I
Segment 1 1 0.201 35.401 0.384 1 1.01 1 0.44 1 0.39 126.15 1 24.501 0.63 1 0.50 1 0.63 1 0.00 1 0.00 1 0.00 1
Reach 7 1 1 1 1 1 1 1 1 1 1 1 1 1
---------- -----------------------------------------------------------------------------------------------------
I I I I I I I I I I I I I I I
Segment 1 1 t.261 35,401 0,391 11.02 1 0.44 1 0.39 126.56 1 24.881 0.63 1 0.50 1 0.63 1 0.00 1 0.00 1 0.00 1
Reach 6 1 1 1 1 1 1 1 1 1 1 1 1 1
-----------------------------------------------------------------------------------------------------
I Flow I CBOD I NBGD I D .O. I
I cfs I mg/1 I mg/1 I mg/1 I
Segment 1 Reach 1
Waste 1 0 .419 1 75 . 000 1110 . 700 i 0 . 000
Headwater,s1 3 . 800 8 .450 1 4 . 260 8 . 100
Tributary 1 0 . 000 I 2 . 000 1 1 . 000 i 7 . 720
* Runoff 1 0 . 000 1 2 . 000 I 1 . 000 7 . 720
Segment 1 Reach 2
Waste I 0 . 000 0 . 000 I 0 . 000 I 0 . 000
Tributary 1 0 . 000 I 2 . 000 1 . 000 7 . 720

Segment 1 Reach 3
Waste I 0 . 000 I 0 . 000 I 0 . 000 i 0 . 000
Tributary I 0 .400 I 2 . 000 I 1 . 000 I 7 . 720
* Runoff I 0 . 000 I 2 . 000 I 1 . 000 I 7 . 720
Segment 1 Reach 4
Waste I 0 . 000 I 0 . 000 I 0 . 000 I 0 . 000
Tributary I 0 . 500 I 2 . 000 I 1 . 000 I 7 . 720
* Runoff I 0 . 000 I 2 . 000 I 1 . 000 I 7 . 720
Segment 1 Reach 5
Waste I 0 . 000 I 0 . 000 I 0 . 000 I 0 . 000
Tributary I 0 . 150 2 . 000 I 1 . 000 I 7 . 720
* Runoff I 0 . 000 I 2 . 000 I 1 . 000 I 7 . 720
Segment 1 Reach 6
Waste I 0 . 000 I 0 . 000 0 . 000 I 0 . 000
Tributary I 0 . 150 I 2 . 000 I 1 . 000 I 7 . 720
* Runoff I 0 . 000 ( 2 . 000 I 1 . 000 I 7 . 720
Segment 1 Reach 7
Waste I 0 . 000 I 0 . 000 I 0 . 000 I 0 . 000
Tributary I 0 . 500 I 2 . 000 I 1 . 000 I 7 . 720
* Runoff 0 . 000 I 2 . 000 I 1 . 000 I 7 . 720
Segment 1 Reach 8
Waste I 0 . 124 145 . 000 190 . 000 I 0 . 000
Tributary I 0 . 000 I 2 . 000 I 1 . 000 I 7 . 720
* Runoff I 0 . 000 I 2 . 000 I 1 . 000 I 7 . 720
* Runoff flow is in cfs/mile

SUMMER
MODEL FOR BANNER ELK SOC : QW=
POST-SOC FLOW & SOC LIMITS
Seg # Reach # Seg Mi G . O . CBOD NBOD Flow
1 1 0 . 00 7 . 30 15 . 05 14 . 82 4 . 22
1 1 0 . 02 7 . 42 15 . 03 14 . 79 4 . 22
1 1 0 . 04 7 . 53 15 . 00 14 . 77 4 . 22
1 1 0 . 06 7 . 63 14 . 98 14 . 74 4 . 22
1 1 0 . 08 7 . 71 14 . 95 14 . 72 4 . 22
1 1 0 . 10 7 . 78 14 . 93 14 . 69 4 . 22
1 1 0 . 12 7 . 84 14 . 90 14 . 67 4 . 22
1 1 0 . 14 7 . 89 14 . 88 14 . 64 4 . 22
1 1 0 . 16 7 . 94 14 . 85 14 . 62 4 . 22
1 2 0 . 16 7 . 94 14 . 85 14 . 62 4 . 22
1 2 0 . 17 7 . 94 14 . 84 14 . 60 4 . 22
1 2 0 . 18 7 . 94 14 . 83 14 . 58 4 . 22
1 2 0 . 19 7 . 93 14 . 82 14 . 57 4 . 22
1 2 0 . 20 7 . 93 14 . 80 14 . 55 4 . 22
1 2 0 . 21 7 . 93 14 . 79 14 . 53 4 . 22
1 2 0 . 22 7 . 93 14 . 78 14 . 52 4 . 22
1 2 0 . 23 7 . 93 14 . 77 14 . 50 4 . 22
1 2 0 . 24 7 . 93 14 . 76 14 . 49 4 . 22
1 2 0 . 25 7 . 93 14 . 74 14 .47 4 . 22
1 2 0 . 26 7 . 93 14 . 73 14 .45 4 . 22
1 3 0 . 26 7 . 91 13 . 63 13 . 29 4 . 62
1 3 0 . 27 7 . 91 13 . 62 13 . 27 4 . 62
1 3 0 . 28 7 . 91 13 . 61 13 . 26 4 . 62
1 3 0 . 29 7 . 92 13 . 60 13 . 24 4 . 62
1 3 0 . 30 7 . 92 13 . 59 13 . 23 4 . 62
1 3 0 . 31 7 . 92 13 . 56 13 . 21 4 . 62
1 3 0 . 32 7 . 92 13 . 57 13 . 20 4 . 62
1 3 0 . 33 7 . 93 13 . 56 13 . 19 4 . 62
1 3 0 . 34 7 . 93 13 . 55 13 . 17 4 . 62
1 3 0 . 35 7 . 93 13 . 54 13 . 16 4 . 62
1 3 0 . 36 7 . 93 13 . 53 13 . 14 4 . 62
1 3 0 . 37 7 . 93 13 . 52 13 . 13 4 . 62
1 3 0 . 38 7 . 94 13 . 51 13 . 11 4 . 62
1 3 0 . 39 7 . 94 13 . 50 13 . 10 4 . 62
1 3 0 . 40 7 . 94 13 .49 13 . 06 4 . 62
1 3 0 . 41 7 . 94 13 . 47 13 . 07 4 . 62
1 3 0 . 42 7 . 94 13 . 46 13 . 05 4 . 62
1 3 0 . 43 7 . 95 13 .45 13 . 04 4 . 62
1 4 0 . 43 7 . 92 12 . 34 11 . 86 5 . 12
1 4 0 .46 7 . 94 12 . 31 11 . 83 5 . 12
1 4 0 . 49 7 . 95 12 . 28 11 . 79 5 . 12
1 4 0 . 52 7 . 97 12 . 25 11 . 75 5 . 12
1 4 0 . 55 7 . 98 12 . 23 11 . 71 5 . 12
1 4 0 . 58 7 . 99 12 . 20 11 . 68 5 . 12
1 5 0 . 58 7 . 98 11 . 91 11 . 37 5 . 27
1 5 0 . 59 7 . 98 11 . 90 11 . 36 5 . 27
1 5 0 . 60 7 . 99 11 . 89 11 . 35 5 . 27
1 5 0 . 61 7 . 99 11 . 88 11 . 34 5 . 27
1 5 0 . 62 8 . 00 11 . 87 11 . 33 5 . 27
1 5 0 . 63 8 . 00 11 . 87 11 . 31 5 . 27
1 5 0 . 64 8 . 00 1 11 . 86 11 . 30 5 . 27
1 5 0 . 65 8 . 01 11 . 85 11 . 29 5 . 27
1 5 0 . 66 8 . 01 11 . 84 11 . 28 5 . 27
1 5 0 . 67 8 . 01 11 . 63 11 . 27 5 . 27
1 5 0 . 68 8 . 02 11 . 82 11 . 26 5 . 27
1 5 0 . 69 8 . 02 11 . 81 11 . 24 5 . 27
1 5 0 . 70 8 . 02 11 . 80 11 . 23 5 . 27
1 6 0 . 70 8 . 01 11 . 53 10 . 95 5 .42
i-- 9 _-nZ9 a n o 1 1 G i i fl a i r 1 ?

1 6 . 0 . 76 6 . 03 11 . 48 10 . 88 5 .42
1 6 0 . 79 8 . 04 11 .46 10 . 85 5 . 42
1 6 0 . 82 8 . 05 11 . 43 10 . 81 5 .42
1 6 0 . 85 6 . 06 11 . 41 10 . 78 5 . 42
1 6 0 . 88 8 . 07 11 . 36 10 . 75 5 . 42
1 6 0 . 91 8 . 07 11 . 36 10 . 71 5 .42
1 6 0 . 94 8 . 08 11 . 33 10 . 68 5 .42
1 6 0 . 97 8 . 08 11 . 31 10 . 65 5 .42
1 7 0 . 97 8 . 05 10 . 52 9 . 83 5 . 92
1 7 0 . 99 8 . 06 10 . 51 9 . 61 5 . 92
1 7 1 . 01 8 . 07 10 . 49 9 . 79 5 . 92
1 7 1 . 03 8 . 08 10 .48 9 . 77 5 . 92
1 7 1 . 05 8 . 08 10 . 46 9 . 75 5 . 92
1 7 1 . 07 8 . 09 10 . 45 9 . 73 5 . 92
1 7 1 . 09 8 . 10 10 . 44 9 . 71 5 . 92
1 7 1 . 11 8 . 10 10 .42 9 . 70 5 . 92
1 7 1 . 13 8 . 11 10 . 41 9 . 68 5 . 92
1 7 1 . 15 8 . 11 10 . 39 9 . 66 5 . 92
1 7 1 . 17 8 . 12 10 . 38 9 . 64 5 . 92
1 8 1 . 17 7 . 95 11 . 09 11 . 29 6 . 04
1 8 1 . 20 7 . 97 11 . 06 11 . 25 6 . 04
1 8 1 . 23 7 . 99 11 . 04 11 . 22 6 . 04
1 8 1 . 26 8 . 01 11 . 02 11 . 19 6 . 04
1 8 1 . 29 8 . 02 11 . 00 11 . 15 6 . 04
1 8 1 . 32 8 . 03 10 . 97 11 . 12 6 . 04
1 8 1 . 35 8 . 05 10 . 95 11 . 09 6 . 04
1 8 1 . 38 8 . 06 10 . 93 11 . 06 6 . 04
1 8 1 . 41 8 . 07 10 . 90 11 . 02 6 . 04
1 8 1 .44 8 . 07 10 . 88 10 . 99 6 . 04
1 8 1 .47 8 . 08 10 . 86 10 . 96 6 . 04
1 8 1 . 50 8 . 09 10 . 84 10 . 93 6 . 04
1 8 1 . 53 8 . 09 10 . 81 10 . 89 6 . 04
1 8 1 . 56 6 . 10 10 . 79 10 . 86 6 . 04
1 8 1 . 59 8 . 10 10 . 77 10 . 83 6 . 04
1 8 1 . 62 8 . 11 10 . 75 10 . 80 6 . 04
1 8 1 . 65 8 . 11 10 . 72 10 . 76 6 . 04
1 8 1 . 68 8 . 12 10 . 70 10 . 73 6 . 04
1 8 1 . 71 8 . 12 10 . 68 10 . 70 6 . 04
1 8 1 . 74 6 . 12 10 . 66 10 . 67 6 . 04
1 8 1 . 77 8 . 13 10 . 63 10 . 64 6 . 04
1 8 1 . 80 8 . 13 10 . 61 10 . 61 6 . 04
1 8 1 . 83 8 . 13 10 . 59 10 . 58 6 . 04
1 8 1 . 86 8 . 13 10 . 57 10 . 54 6 . 04
1 8 1 . 89 6 . 14 10 . 55 10 . 51 6 . 04
1 8 1 . 92 8 . 14 10 . 52 10 . 48 6 . 04
1 8 1 . 95 8 . 14 10 . 50 10 .45 6 . 04
1 8 1 . 98 8 . 14 10 . 48 10 . 42 6 . 04
1 8 2 . 01 8 . 14 10 .46 10 . 39 6 . 04
1 8 2 . 04 8 . 15 10 .44 10 . 36 6 . 04
1 8 2 . 07 8 . 15 10 .41 10 . 33 6 . 04
1 8 2 . 10 8 . 15 10 . 39 10 . 30 6 . 04
1 8 2 . 13 8 . 15 10 . 37 10 . 27 6 . 04
1 8 2 . 16 8 . 15 10 . 35 10 . 24 6 . 04
1 8 2 . 19 8 . 15 10 . 33 10 . 21 6 . 04
1 8 2 . 22 8 . 16 10 . 31 10 . 18 6 . 04
1 8 2 . 25 8 . 16 10 . 28 10 . 15 6 . 04
1 8 2 . 28 8 . 16 10 . 26 10 . 12 6 . 04
1 8 2 . 31 8 . 16 10 . 24 10 . 09 6 . 04
1 8 2 . 34 8 . 16 10 . 22 10 . 06 6 . 04
1 8 2 . 37 8 . 16 10 . 20 10 . 03 6 . 04
1 8 2 .40 8 . 16 10 . 18 10 . 00 6 . 04
1 8 2 .43 8 . 16 10 . 16 9 . 97 6 . 04
Seg # Reach # Seg Mi I D . O . I CBOD I NBOD Flow

SUMMER
MODEL FOR BANNER ELK SOC : QW=
DESIGN FLOW & SOC LIMITS
---------- MODEL RESULTS ----------
Discharger• : TOWN OF BANNER ELK
Receiving Stream : ELK RIVER
-------- --------------------------------------------------------------
The End D .O . is 8 . 18 mg/l .
The End CBOD is 10 . 97 mg/l .
The End NBOD is 9 . 09 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 7 . 14 0 . 00 1
Reach 1 75 . 00 110 . 70 0 . 00 0 . 33000
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
Reach 5 0 . 00 0 . 00 0 . 00 0 . 00000
Reach 6 0 . 00 0 . 00 0 . 00 0 . 00000
Reach 7 0 . 00 0 . 00 0 . 00 0 . 00000
Reach 8 45 . 00 90 . 00 0 . 00 0 . 08000

*** MODEL SUMMARY DATA ***
Discharger, : TOWN OF BANNER ELK Subbasin 040201
Receiving Stream . ELK RIVER Stream Class : C-TR
Summer 7Q10 : 3 . 8 Winter, 7Q10 : 6 . 0
Design Temper•atur•e : 23 . 0
ILENGTHI SLOPEI VELOCITY I OEPTHI Kd I Kd I Ka I Ka I KN I KN I KNR I KNR I S00 I SOD I
I mile I ft/mi1 fps I ft Idesignl @201 Idesignl @201 Idesignl @201 Idesignl @201 Idesignl @201 1
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I I I I I I I I I I I I I I I
Segment I 1 0.161 95.001 0,451 1 0.79 1 0.63 1 0.55 153.37 1 50.001 0,63 1 0.50 1 0.63 1 0.00 1 0.00 1 0.00 1
Reach I I I I I I I I I I I I I I
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I I I I I I I I I I I I I I I
Segment I 1 0.101 35.401 0,343 1 0.92 1 0.44 1 0.38 123.34 1 21.871 0.63 1 0.50 1 0.63 1 0.00 1 0.00 1 0.00 1
Reach 2 1 1 1 1 1 1 1 1 1 1 1 1 1
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I I I I I I I I I I I I I I I
Segment 1 1 0.171 35,401 0.355 1 0.94 1 0.44 1 0.38 124,13 1 22.611 0.63 1 0.50 1 0.63 1 0.00 1 0.00 1 0.00 I
Reach 3 1 1 1 1 1 1 1 1 1 1 1 1 1
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I I I I I I I I I I I I I 1
Segment 1 1 0.151 35.401 0.369 1 0.97 1 0.44 1 0.39 125.09 1 23,511 0.63 1 0.50 1 0.63 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
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I I I I I I I I I I I I I I I
Segment 1 1 0,121 35,401 0.372 1 0.98 1 0.44 1 0.39 125.33 1 23.731 0.63 1 0,50 1 0.63 1 0,00 1 0.00 1 0.00 1
Reach 5 1 1 1 1 1 1 1 1 1 1 1 1 1
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I I I I I I I I I I I I I I I
Segment 1 1 0,271 35.401 0.377 1 0.99 1 0.44 1 0.39 125.66 1 24.041 0.63 1 0.50 1 0.63 1 0.00 1 0.00 1 0.00 1
Reach 6 1 1 1 1 1 1 1 1 1 1 1 1 1
I I I I I I I I I I I I I I I
Segment 1 1 0,201 35.401 0.389 1 1.01 1 0.44 1 0,39 126,46 1 24.791 0.63 1 0.50 1 0,63 1 0,00 1 0,00 1 0.00 1
Reach 7 1 I I
i -----I------I------ ------ ------I------ ------ ------I------I--------------
I I I I I I I I I I I I I I I
Segment 1 1 1.261 35.401 0.395 1 1.02 1 0.45 1 0.39 126.87 1 25.171 0.63 1 0.50 1 0.63 10.00 1 0.00 1 0.00 1
Reach 8 1 1 1 1 1 1 1 1 1 1 1 1 1
--------------------------------------------------------------------------------
I Floe, I CBC-D I NBOD I D .O. I
I cfs I mg/1 1 mg/1 1 mg/1 I
Segment 1 Reach 1
Waste 1 0 . 512 1 75 . 000 1110 . 700 1 0 . 000
Headwater•s1 3 . 800 1 8 .450 1 0 . 000 1 8 . 100
Tributary 1 0 . 000 1 2 . 000 1 1 . 000 1 7 . 720
* Runoff 1 0 . 000 1 2 . 000 1 . 000 1 7 . 720
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 . 000 7 . 720

Segment 1 Reach 3
Waste 0 . 000 I 0 . 000 0 . 000 I 0 . 000
Tributary I 0 .400 I 2 . 000 I 1 . 000 I 7 . 720
* Runoff 0 . 000 I 2 . 000 I 1 . 000 7 . 720
Segment i Reach 4
Waste I 0 . 000 I 0 . 000 0 . 000 0 . 000
Tributary I 0 . 500 2 . 000 I 1 . 000 I 7 . 720
* Runoff I 0 . 000 I 2 . 000 1 . 000 I 7 . 720
Segment 1 Reach 5
Waste I 0 . 000 I 0 . 000 0 . 000 0 . 000
Tributary I 0 . 150 2 . 000 I 1 . 000 I 7 . 720
Runoff I 0 . 000 I 2 . 000 1 . 000 7 . 720
Segment 1 Reach 6
Waste I 0 . 000 I 0 . 000 0 . 000 I 0 . 000
Tributary I 0 . 150 2 . 000 I 1 . 000 I 7 . 720
* Runoff I 0 . 000 I 2 . 000 1 . 000 7 . 720
Segment 1 Reach 7
Waste I 0 . 000 I 0 . 000 0 . 000 0 . 000
Tributary I 0 . 500 2 . 000 I 1 . 000 I 7 . 720
* Runoff I 0 . 000 I 2 . 000 1 . 000 I 7 . 720
Segment 1 Reach 8
Waste I 0 . 124 45 . 000 190 . 000 I 0 . 000
Tributary 0 . 000 I 2 . 000 I 1 . 000 I 7 . 720
* Runoff I 0 . 000 2 . 000 I 1 . 000 I 7 . 720
* Runoff flow is in cfs/mile

SUMMER
MODEL FOR BANNER ELK SOC : QW=
DESIGN FLOW & SOC LIMITS•
Seg # Reach # Seg Mi D .O. CBOD NBOD Flow
i 1 0 . 00 7 . 14 16 . 35 13 . 13 4 . 31
1 1 0 . 02 7 . 28 16 . 32 13 . 11 4 . 31
1 1 0 . 04 7 .41 16 . 29 13 . 09 4 . 31
1 1 0 . 06 7 . 52 16 . 26 13 . 07 4 . 31
1 1 0 . 08 7 . 62 16 . 24 13 . 04 4 . 31
1 1 0 . 10 7 . 70 16 . 21 13 . 02 4 . 31
1 1 0 . 12 7 . 77 16 . 18 13 . 00 4 . 31
1 1 0 . 14 7 . 83 16 . 15 12 . 98 4 . 31
1 1 0 . 16 7 . 89 16 . 13 12 . 96 4 . 31
1 2 0 . 16 7 . 89 16 . 13 12 . 96 4 . 31
1 2 0 . 17 7 . 89 16 . 12 12 . 94 4 . 31
1 2 0 . 18 7 . 89 16 . 10 12 . 93 4 . 31
1 2 0 . 19 7 . 89 16 . 09 12 . 91 4 . 31
1 2 0 . 20 7 . 89 16 . 08 12 . 90 4 . 31
1 2 0 . 21 7 . 89 16 . 06 12 . 88 4 . 31
1 2 0 . 22 7 . 90 16 . 05 12 . 87 4 . 31
1 2 0 . 23 7 . 90 16 . 04 12 . 86 4 . 31
1 2 0 . 24 7 . 90 16 . 03 12 . 84 4 . 31
1 2 0 . 25 7 . 90 16 . 01 12 . 83 4 . 31
1 2 0 . 26 7 . 90 16 . 00 12 . 81 4 . 31
1 3 0 . 26 7 . 89 14 . 81 11 . 81 4 . 71
1 3 0 . 27 7 . 89 14 . 80 11 . 80 4 . 71
1 3 0 . 28 7 . 89 14 . 79 11 . 78 4 . 71
1 3 0 . 29 7 . 90 14 . 78 11 . 77 4 . 71
1 3 0 . 30 7 . 90 14 . 77 11 . 76 4 . 71
1 3 0 . 31 7 . 91 14 . 76 11 . 75 4 . 71
1 3 0 . 32 7 . 91 14 . 75 11 . 73 4 . 71
1 3 0 . 33 7 . 92 14 . 73 11 . 72 4 . 71
1 3 0 . 34 7 . 92 14 . 72 11 . 71 4 . 71
1 3 0 . 35 7 . 92 14 . 71 11 . 70 4 . 71
1 3 0 . 36 7 . 93 14 . 70 11 . 68 4 . 71
1 3 0 . 37 7 . 93 14 . 69 11 . 67 4 . 71
1 3 0 . 38 7 . 93 14 . 68 11 . 66 4 . 71
1 3 0 . 39 7 . 94 14 . 67 11 . 64 4 . 71
1 3 0 .40 7 . 94 14 . 66 11 . 63 4 . 71
1 3 0 .41 7 . 94 14 . 65 11 . 62 4 . 71
1 3 0 .42 7 . 94 14 . 63 11 . 61 4 . 71
1 3 0 . 43 7 . 95 14 . 62 11 . 59 4 . 71
1 4 0 .43 7 . 92 13 .41 10 . 58 5 . 21
1 4 0 . 46 7 . 94 13 . 38 10 . 54 5 . 21
1 4 0 .49 7 . 96 13 . 35 10 . 51 5 . 21
1 4 0 . 52 7 . 97 13 . 32 10 .48 5 . 21
1 4 0 . 58 8 . 00 13 . 27 10 .41 5 . 21
1 5 0 . 58 1 . 99 12 . 95 10 . 15 5 . 36
1 5 0 . 59 7 . 99 12 . 94 10 . 14 5 . 36
1 5 0 . 60 8 . 00 12 . 93 10 . 13 5 . 36
1 5 0 . 61 8 . 00 12 . 92 10 . 12 5 . 36
1 5 0 . 62 8 . 01 12 . 91 10 . 11 5 . 36
1 5 0 . 63 8 . 01 12 . 90 10 . 10 5 . 36
1 5 0 . 64 8 . 01 12 . 89 10 . 09 5 . 36
1 5 0 . 65 8 . 02 12 . 88 10 . 08 5 . 36
1 5 0 . 66 8 . 02 12 . 88 10 . 07 5 . 36
1 5 0 . 67 8 . 03 12 . 87 10 . 06 5 . 36
1 5 0 . 68 8 . 03 12 . 86 10 . 05 5 . 36
1 5 0 . 69 6 . 03 12 . 85 10 . 04 5 . 36
1 5 0 . 70 8 . 03 12 . 84 10 . 02 5 . 36
1 6 0 . 70 8 . 03 12 . 54 9 . 78 5 . 51

1 6 •. 0 . 76 8 . 05 12 .49 9 . 72 5 . 51
i 6 0 . 79 8 . 06 12 .46 9 . 69 5 . 51
1 6 0 . 82 8 . 07 12 .44 9 . 66 5 . 51
1 6 0 . 85 8 . 07 12 .41 9 . 63 5 . 51
1 6 0 . 88 8 . 08 12 . 38 9 . 60 5 . 51
i 6 0 . 91 8 . 09 12 . 36 9 . 57 5 . 51
1 6 0 . 94 8 . 09 12 . 33 9 . 54 5 . 51
1 6 0 . 97 8 . 10 12 . 30 9 . 51 5 . 51
1 7 0 . 97 8 . 06 11 .45 8 . 81 6 . 01
1 7 0 . 99 8 . 07 11 .43 8 . 79 6 . 01
1 7 1 . 01 8 . 08 11 .41 8 . 77 6 . 01
1 7 1 . 03 8 . 09 11 .40 8 . 75 6 . 01
1 7 1 . 05 8 . 10 11 . 38 8 . 74 6 . 01
1 7 1 . 07 8 . 10 11 . 37 8 . 72 6 . 01
1 7 1 . 09 8 . 11 11 . 35 8 . 70 6 . 01
1 7 1 . 11 8 . 12 11 . 33 8 . 68 6 . 01
1 7 1 . 13 8 . 12 11 . 32 8 . 67 6 . 01
1 7 1 . 15 8 . 13 11 . 30 8 . 65 6 . 01
1 7 1 . 17 8 . 13 11 . 29 8 . 63 6 . 01
1 8 1 . 17 7 . 97 11 . 97 10 . 28 6 . 14
1 8 1 . 20 7 . 99 11 . 94 10 . 25 6 . 14
1 8 1 . 23 8 . 01 11 . 92 10 . 22 6 . 14
1 8 1 . 26 8 . 02 11 . 89 10 . 19 6 . 14
1 8 1 . 29 8 . 04 11 . 87 10 . 16 6 . 14
1 8 1 . 32 8 . 05 11 . 84 10 . 13 6 . 14
1 8 1 . 35 8 . 06 11 . 82 10 . 10 6 . 14
1 8 1 . 38 8 . 07 11 . 80 10 . 07 6 . 14
1 8 1 . 41 8 . 08 11 . 77 10 . 04 6 . 14
1 8 1 .44 8 . 09 11 . 75 10 . 01 6 . 14
1 8 1 .47 6 . 09 11 . 72 9 . 98 6 . 14
1 8 1 . 50 8 . 10 11 . 70 9 . 95 6 . 14
1 8 1 . 53 8 . 11 11 . 67 9 . 92 6 . 14
1 8 1 . 56 8 . 11 11 . 65 9 . 89 6 . 14
1 8 1 . 59 8 . 12 11 . 63 9 . 87 6 . 14
1 8 1 . 62 8 . 12 11 . 60 9 . 84 6 . 14
1 8 1 . 65 8 . 13 11 . 58 9 . 81 6 . 14
1 8 1 . 68 8 . 13 11 . 55 9 . 78 6 . 14
1 8 1 . 71 8 . 13 11 . 53 9 . 75 6 . 14
1 8 1 . 74 8 . 14 11 . 51 9 . 72 6 . 14
1 8 1 . 77 8 . 14 11 . 48 9 . 69 6 . 14
1 8 1 . 80 8 . 14 11 . 46 9 . 67 6 . 14
1 8 1 . 83 8 . 14 11 .43 9 . 64 6 . 14
1 8 1 . 86 8 . 15 11 .41 9 . 61 6 . 14
1 8 1 . 89 8 . 15 11 . 39 9 . 58 6 . 14
1 8 1 . 92 8 . 15 11 . 36 9 . 55 6 . 14
1 8 1 . 95 8 . 15 11 . 34 9 . 53 6 . 14
i 8 1 . 98 8 . 15 11 . 32 9 . 50 6 . 14
1 8 2 . 01 8 . 16 11 . 29 9 .47 6 . 14
1 8 2 . 04 8 . 16 11 . 27 9 .44 6 . 14
1 8 2 . 07 8 . 16 11 . 25 9 . 41 6 . 14
1 8 2 . 10 8 . 16 11 . 22 9 . 39 6 . 14
1 8 2 . 13 8 . 16 11 . 20 9 . 36 6 . 14
1 8 2 . 16 8 . 16 11 . 18 9 . 33 6 . 14
1 8 2 . 19 8 . 17 11 . 15 9 . 30 6 . 14
1 8 2 . 22 8 . 17 11 . 13 9 . 28 6 . 14
1 8 2 . 25 8 . 17 11 . 11 9 . 25 6 . 14
1 8 2 . 28 8 . 17 11 . 08 9 . 22 6 . 14
1 8 2 . 31 8 . 17 11 . 06 9 . 20 6 . 14
i 8 2 . 34 8 . 17 11 . 04 9 . 17 6 . 14
1 8 2 . 37 8 . 17 11 . 02 9 . 14 6 . 14
1 8 2 .40 8 . 17 10 . 99 9 . 12 6 . 14
1 8 2 .43 8 . 18 10 . 97 9 . 09 6 . 14
Seg # Reach # I Seg Mi D .O. CBOD NBOD Flow

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Request Form for In-Stream Assessment for 67B
Watauga
NAME OF FACILITY Town of Banner Elk SUBBASIN 04-02-01
COUNTY _Avery REGION _ASHEVILLE_ DESIGN FLOW _0.330 MGD
RECEIVING STREAM _Elk River, C-Trout___
B6CKg&0U D P,4TA:
A. Why is SOC needed? (Facility is out of compliance with which
effluent limits?
Facility has design deficiencies causing BOD and TSS violations of
NPDES Permit limits .
B. History of SOC requests:
1 . Monthly Average waste flow
prior to any SOC 0.238 _ mgd
2 . SOC flow added: Date: flow: mgd
N/A Date: flow: mgd
Date: _ flow: mgd
total of previously approved SOC flow: mgd
3 . Flows lost from plant flow: 0 mgd
4. This SOC request flow: 0 . 015 mgd
5 . Total plant flow post-SOC
( sum of original flow and
SOC flow minus losses) flow: _0.253 mgd
6. Is this an accurate flow balance for plant? Why/why not?
Probably not. The influent flow measuring device (3"
Parshall Flume) is out of calibration.
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.

THIS SOC:
A. Request is for domestic or industrial waste If it is a combin-
ation, please specify percentages.
Request is for domestic waste only.
B. What type of industry? please attach any pertinent data.
N/A
C. The region proposes the following SOC limits:
BODS 50/75 _ mg/l
NH3 mg/1
DO mg/l
TSS 50/75 mg/l
fecal coliform _1000/2000 #/100 ml
PH 66=9 SU
l