NC0046418_Wasteload Allocation_19900724

D R E U ESES WASTE LOAD ALLOCATION
Q
PERMIT NO.: NCO046418
PERMITTEE NAME: Wilkes County Schools / Mt. View Elementary 2
Facility Status: Existing Drainage e mi ) ,p5 Avg. Streamflow (cfs): - 0 7
Permit Status: Renewal 7Q10 (cfs) 0 Winter 7Q10 (cfs) b 30Q2 (cfs)
Major
Pipe No.:
Minor
001
Design Capacity: 0.01 MGD
Domestic (% of Flow):
Industrial (% of Flow):
Comments:
PI '.
YRC[ (l. vlff q(5�6�,14 " cif T -
1)isct� s Gbaoe to-ke
RECEIVING STREAM: an unnamed tributary to Mulberry Creek
Class: C
Sub -Basin: 03-07-01
Reference USGS Quad: C14NE (please attach)
County: Wilkes
Modeler
Date Rec.
#
C
S 8 qo
S7o3
Toxicity Limits: IWC
Instream Monitoring:
% Acute/Chronic
Parameters
l7d,'r�,,,o. ra
Upstream ✓ Location },n„�L
Downstream Location SU I-eafi below
cllts-L.n.•ge
Effluent
Characteristics,-
t— Pe' .
_ V v 3
BODS (mg/1)
30
3o
iD
D.O. (mg/1)
�o
�p
4►
to
TSS (mg/1)
3p
30
30
30
F. Col. (/100 nil)
ap0
o2bb
-26 o
Zoo
4
Regional Office: Winston-Salem Regional Office
Previous Exp. Date: 1/31/91 Treatment Plant Class: (-------------- _ _ _. _ COMMENTS --
Zero flow policy: Recommend removal of discharge.
Classification changes within three miles: (Renew with above limits for 3 years. Facility must submit an engineering
No change within three miles. (proposal within 12 months evaluating alternatives to discharge. If no
feasible alternatives, limits will change after 3 years to 5(10) and l(1.8)
for BOD5 and NH3-N (summer/winter). Instream monitoring may be dropped
after facility agrees, in writing, to a schedule for removal.
Facility will receive letter addressing chlorine toxicity.
----------------------
Requested by: Mack Wiggins Date: 5/1/90
Prepared by: + e+n.� Date:
Reviewed by: ( . Date: `7
$6 0o = \3 � � �� _4W
Comments:
AAr&K. 3 y25. in ZFS

N.C.. Uept. NRCD
J U N 2 6 1990
Winston-Salem
Regional Office
Request No.:
5703
------------------- WAST
LOAD ALLOCATION APPROVAL FORM -------------------
Facility Name:
Mt. View Elementary
School
NPDES No.:
NCO046418
Type of Waste:
Domestic
Status:
Existing/Renewal
Receiving Stream:
UT to Mulberry Creek
Classification:
C
Subbdsin:
30701
Drainage area:
0.050
sq mi
County:
Wilkes
Summer 7Q10:
0.00
cfs
Regional Office:
Winston-Salem
Winter 7Q10:
0.00
cfs
Requestor:
Mack Wiggins
Average flow:
0.075
cfs
Date of Request:
5/7/90
30Q2:
0.00
cfs
Quad:
C14NE
-------------------- RECOMMENDED EFFLUENT LIMITS
--------------------------
EXISTING
PROPOSED ,
Wasteflow (mgd):
0.010
0.010T
BOD5 (mg/1):
30
30.
NH3N (mg/1) :
no limit
no limit
�y
ES�
DO (mg/1):
no limit
6
_e�;.'-;
;,.
TSS (mg/1) :
30
30
JUL
17 199U
Fecal coliform (#/100ml):
1000
200
pH (su) :
6-9
6-9
PERMITS & ENGINEFRING
Toxicity Testing Req.: 17-�p - /z s/1-
--- e�
-----------------MONITORING -------------------------------------
PARAMETERS: DO, TEMP, COND, FECAL COLIFORM J^
Upstream: *Oyes Location: p.bOVE &6C-ha4F p�-( /I&w
Downstream: Yes Location:50 feet below discharge point
----------------------------- COMMENTS ----------------------------
Facility discharges to dry ditch 1200 ft upstream of a lake.
In 1980 the school board agreed to pipe the effluent below the lake in
order to receive secondary limits. The pipe was never installed.
Facility consistently violates pH limit. Meets all other limits.
Possible ammonia and chlorine toxicity. Require toxicity testing.
Facility will receive letter addressing chlorine.
Recommend removal of discharge. Facility must submit engineering report
evaluating alternatives within 12 months. If no feasible alternatives,
limits will change after 3 years to 5(10) and l(1.8) summer (winter) for
BOD5 and NH3-N. Instream monitoring may be dropped when the facility agrees
in writing, to a schedule for removal.
-----------------------Y----- ----- ----- -------------------------------
Recommended b j L'p� vy� Date: 6i� $v
Reviewed by
Instream Assessment: Cc� �c�K- Date:
Regional Supervisor: . 61-L Date: G 16 -f U
Permits & Engineering: Date: Zito
RETURN TO TECHNICAL SUPPORT BY: JUL 19 1990
'�, w,,el !�- cr.,R....Q � S J C . F¢w,....-.—�% nPo dB'�-� •

8/89
Facility Name Ns wi-O Yiew uemen." 5ek0uj Permit # N COO q6 y /
CHRONIC TOXICITY TESTING REQUIREMENT (QRTRLY)
The effluent discharge shall at no time exhibit chronic toxicity in any two consecutive toxicity tests,
using test procedures outlined in:
1.) The North Carolina Ceriodaphnia chronic effluent bioassay procedure (North Carolina Chronic
Bioassay Procedure - Revised *June 1988) or subsequent versions.
The effluent concentration at which there may be no observable inhibition of reproduction or
significant mortality is qq—% (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 fast test will be performed after thirty days from
issuance of this permit during the months of M 9., Jyu ,SEP '>IEC- . Effluent
sampling for this testing shall be performed at the I PDES pied 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
P.O. Box 27687
Raleigh, N.C. 27611
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 0. O cfs
Permited Flow 6. 0 1 MGD Recommended by:
IWC% loo
Basin & Sub -basin D 3 -07 - O l �(�
Receiving Stream Ur -b Mulbe«v CreeK
County Wilkes Date "13/9t7
**Chronic Toxicity (Ceriodaphnia) P/Fat 11%, MAR, duW,5 P. 7YoGSee Part _j_, Condition k

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ye cr 3� 1 i

li
►►1�. VreL3 Cfe en+a^t
UT Mu1SOen Grep-K
dnj dt�{�c. u►aa� lake
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State of North Carolina
Department of Environment, Health, and Natural Resources
Division of EWronmental Management
512 North Salisbury Street • Raleigh, North Carolina 27611
James G. Martin, Governor George T. Everett, Ph.D.
WHIam W. CobW, Jr., Secretary June 19, 1990 Director
Keith Lenderman
Mt. View Elementary School/Wilkes County Board of Education
201 West Main Street
Wilkesboro, NC 28697
Subject: Chlorine Toxicity
NPDES Permit No. NCO046418
Wilkes County
Dear Mr. Lenderman:
Chlorine, a widely used wastewater disinfectant for the
treatment of coliform organisms, often remains instream in residual
amounts that may prove to be toxic under critical low stream flow
conditions. In the last decade, EPA assessed the potential adverse
effects of chlorine to the aquatic environment and has taken steps to
reduce the impacts through the development of federal criteria. In
1986, EPA recommended that all states have a chlorine standard by
their next triennial review of water quality standards.
In revising its water quality standards in 1989, North Carolina
developed an action level for chlorine of 17 ug/1 (freshwater classes
only). In addition, the fecal coliform limit was reduced from 1000
colonies/100 ml to 200 colonies/ 100 ml. Under a new DEM procedure,
dechlorination and chlorine limits are now recommended for all new or
expanding dischargers proposing the use of chlorine for effluent
disinfection. The Division is reviewing chlorine levels from all
existing dischargers as part of their NPDES permit renewal process.
Y.
Our records indicate that chlorine from your facility's effluent
discharge is considered toxic to the receiving stream under low flow
conditions, i.e., the amount of chlorine discharged causes a
violation of the instream action level for chlorine (17 ug/1) under
7Q10 conditions (the lowest average daily flow for seven (7)
consecutive days during a ten (10) year period). Action should be
taken to reduce the effluent concentration of chlorine to an
acceptable level. Based on your facility's instream waste
concentration of 100%, an acceptable level of chlorine in your
effluent is 17 ug/1 or 0.017 mg/l. If this level is not feasible,
you should consider dechlorination or alternate methods of
disinfection for your facility to ensure that both chlorine and
bacterial limits are met. In addition, if your facility plans to
undertake any phase of construction, dechlorination or alternate
disinfection should be included. However, please note that an
authorization to construct must be obtained from this Division prior
to any alteration to your treatment plant.
route rmweon rays
P.O. Box 27687, Raleigh, North Carolina 27611-7687 Telephone [phone]
A - rev, o A nr%rnnrh inihr AfFirmafnio Arfinn FmnlnvPr

-2-
The Division is currently reviewing its water quality
regulations pertaining to chlorine. In the future, effluent limits
and/or dechlorination may be required of existing facility's with
chlorine problems. If the chlorine levels in your facility's
effluent remain unchanged, a chlorine limit or a whole effluent
toxicity testing requirement may be added to your permit limitations.
Please feel free to call Steve Mauney of the Division's Regional
Office at [phone], if you have any questions or comments
regarding this issue.
SWT/eaj
cc: Winston-Salem Office
Central Files
Sincerely,
• da _
Steve Tedder
Water Quality Section Chief
K-

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SUMMER
---------- MODEL RESULTS ----------
Discharger : MT. VIEW ELEM SCHOOL
Receiving Stream : HAY MEADOW CREEK
----------------------------------------------------------------------
The End D.O. is 8.17 mg/l.
The End CBOD is 1.77 mg/l.
The End NBOD is 1.23 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 45.00 90.00 0.00 0.01000

*** MODEL SUMMARY DATA ***
•Discharger : MT. VIEW ELEM SCHOOL Subbasin 030701
Receiving Stream : HAY MEADOW CREEK Stream Class: C
Summer 7Q10 : 1.2 Winter 7Q10 : 1.8
'Design Temperature: 25.0
ILENGTHI SLOPEI VELOCITY I DEPTHI Kd I Kd I Ka I Ka I KN I
I mile I ft/mil fps I ft Idesignl @2016 Idesignl @20;6 (design)
--------------------------------------------------------------------------------
I I I I I I I I I I
Segment 1 I 2.701 43.601 0.271 1 0.59 1 0.57 1 0.45 123.69 1 21.251 0.73 1
Reach 1 1 1 1 1 1 1 1 1 1 1
--------------------------------------------------------------------------------
I
Flow I
CBOD I
NBOD I
D.O. 1
cfs 1
mg/1 I
mg/1 I
mg/l I
Segment 1 Reach 1
Waste 1
0.015 (
45.000 190.000
(
0.000
Headwatersl
1.200 1
2.000 1
1.000 I
7.440
Tributary I
0.000 I
2.000 i
1.000 1
7.440
* Runoff 1
0.140 (
2.000 I
1.000 1
7.440
* Runoff flow is in cfs/mile

SUMMER
I Seg #
I Reach #
I Seg Mi I
D.O. I
CBOD I
NBOD (
Flow I
1
1
0.00
7.35
2.55
2.13
1.22
1
1
0.10
7.67
2.51
2.09
1.23
1
1
0.20
7.86
2.47
2.04
1.24
1
1
0.30
7.97
2.43
2.00
1.26
1
1
0.40
8.04
2.40
1.95
1.27
1
1
0.50
8.08
2.36
1.91
1.29
1
1
0.60
8.10
2.33
1.87
1.30
1
1
0.70
8.12
2.30
1.83
1.31
1
1
0.80
8.13
2.26
1.79
1.33
1
1
0.90
8.13
2.23
1.75
1.34
1
1
1.00
8.14
2.20
1.72
1.36
1
1
1.10
8.14
2.17
1.68
1.37
1
1
1.20
8.14
2.14
1.65
1.38
1
1
1.30
8.15
2.11
1.61
1.40
1
1
1.40
8.15
2.08
1.58
1.41
1
1
1.50
8.15
2.06
1.55
1.43
1
1
1.60
8.15
2.03
1.52
1.44
1
1
1.70
8.15
2.00
1.49
1.45
1
1
1.80
8.15
1.98
1.46
1.47
1
1
1.90
8.16
1.95
1.43
1.48
1
1
2.00
8.16
1.93
1.40
1.50
1
1
2.10
8.16
1.90
1.38
1.51
1
1
2.20
8.16
1.88
1.35
1.52
1
1
2.30
8.16
1.86
1.33
1.54
1
1
2.40
8.16
1.83
1.30
1.55
1
1
2.50
8.16
1.81
1.28
1.57
1
1
2.60
8.17
1.79
1.25
1.58
1
1
2.70
8.17
1.77
1.23
1.59
I Seg #
I Reach #
I Seg Mi I
D.O. I
CBOD I
NBOD I
Flow I

�►ar
OD
i z s

Strcam :.
-
mainSte- m
slope- CnICALtion S
n �
iG
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o dtst si
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,
SUMMER
------ MODEL RESULTS ----------
Discharger : MT. VIEW ELEM
Receiving Stream : UT TO MULBERRY CREEK
----------------------------------------------------------------------
The End D.O. is 8.14 mg/l.
The End CBOD is 2.73 mg/l.
The End NBOD is 3.05 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 7.18 0.00 1
Reach 1 45.00 99.00 0.00 0.01000

*** MODEL SUMMARY DATA ***
,'Discharger : MT. VIEW ELEM Subbasin : 030701
Receiving Stream : UT TO MULBERRY CREEK Stream Class: C
-,Summer 7Q10 : 0.43 Winter 7Q10 : 0.67
Design Temperature: 25.0
ILENGTHI SLOPEI VELOCITY I DEPTHI Kd I Kd I Ka I Ka I KN I
I mile I ft/mil fps I ft Idesignl @20% Idesignl @20% Idesignl
----------------------------------------------------------- ----------------------
I I I I I I I I I I
Segment 1 1 0.751 94.001 0.226 1 0.39 1 0.68 1 0.54 142.59 1 38.201 0.73 1
Reach 1 1 1 1 1 1 1 1 1 1 1
--------------------------------------------------------------------------------
1
Flow
l CBOD
1 NBOD I
1
cfs
I mg/l
I mg/l I
Segment 1 Reach 1
Waste 1
0.015
1 45.000
199.000 1
Headwatersl
0.430
1 2.000
1 1.000 1
Tributary I
0.000
I 2.000
I 1.000 I
* Runoff I
0.210
I 2.000
I 1.000 I
* Runoff flow is in cfs/mile
D.o. I
mg/l I
0.000
7.440
7.440
7.440

r
SUMMER
„I Seg #
I Reach # i
Seg Mi I
D.O. I
CBOD I
NBOD I
Flow I
1
1
0.00
7.18
3.50
4.41
0.45
• 1
1
0.05
7.60
3.43
4.29
0.46
1
1
0.10
7.83
3.37
4.17
0.47
1
1
0.15
7.96
3.31
4.06
0.48
1
1
0.20
8.03
3.25
3.96
0.49
1
1
0.25
8.07
3.19
3.86
0.50
1
1
0.30
8.10
3.14
3.76
0.51
1
1
0.35
8.11
3.09
3.67
0.52
1
1
0.40
8.12
3.04
3.58
0.53
1
1
0.45
8.13
2.99
3.49
0.54
1
1
0.50
8.13
2.94
3.41
0.55
1
1
0.55
8.13
2.90
3.33
0.56
1
1
0.60
8.14
2.85
3.26
0.57
1
1
0.65
8.14
2.81
3.19
0.58
1
1
0.70
8.14
2.77
3.12
0.59
1
1
0.75
8.14
2.73
3.05
0.60
i Seg #
I Reach #
I Seg Mi I
D.O. I
CBOD I
NBOD I
Flow I