NC0066796_Wasteload Allocation_19910516

NPDES WASTE LOAD ALLOCATION
PERMIT NO.: NCO066796
PERMITTEE NAME: Buncombe County Board of Education /
Facility Status: Existing
Pen -nit Status: Renewal
Major Minor
Pipe No.: 001
Design Capacity: 0.0057 MGD
Domestic (% of Flow): 100 %
Industrial (% of Flow):
Comments:
refer: Basinwide i Streamline WLA file
4 1 at front of subbasin
RECEIVING STREAM: Sluder Branch
Class: C
Sub -Basin: 04-03-02
Reference USGS Quad: E8NW (please attach)
County: Buncombe
Regional Office: Asheville Regional Office
Previous Exp. Date: 10/31/91 Treatment Plant Class: 1
Classification changes within three miles:
No chance within three miles.
Requested by: Mack Wiggins Date: 2/15/91
Prepared by: Date:
Reviewed by: Date:
�-
Modeler
Date Rec.
#
1 A
is
Drainage Area (mi ) / 0/ Avg. Streamflow (cfs): U
7Q10 (cfs) D. /q Winter 7Q10 (cfs) 0. 2C 30Q2 (cfs) 0..3�;
Toxicity Limits: IWC % Acute/Chronic
Instream Monitoring:
Parameters A/ A
Upstream Location
Downstream Location
Effluent
Characteristics
Summer
Milk"-
�x—--
BOD5 (mg/1)
30. D
NH3-N (mg/1)
N. O
D.O. (mg/1)
TSS (mg/1)
j o . C)
F. Col. (/100 ml)
�� 0
pH (SU)
0
rTi�
I
Comments:
I amVAP ■ a amow
UM

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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
Request # 6066
Buncombe County Board of Education/Leicester Elementary School
NCO066796
Domestic - 100%
Existing
Renewal
Sluder Branch
C
040302
Buncombe
Stream Characteristic:
Asheville Regional Office
USGS #
03.4516.6020
Wiggins
Date:
1991
2/15/91
Drainage Area:
1.01
E8NW
Summer 7Q10:
0.19
Winter 7Q10: 0.26
Average Flow: 1.0
30Q2: 0.35
r,
Wasteload Allocation Summary
(approach taken, correspondence with region, EPA, etc.)
The fecal coliform limit was changed from 1000/100 ml to 200/100ml. Ammonia limit given, if
facility would rather have toxicity testing instead of this limit, please vise.
Fg-& 141y w,11 ne ctl, r b #t,) and
Special Schedule Requirements and additional comments from Reviewers:
Recommended by: /p17" Date:
Reviewed by /
Instream Assessment: Date: /
Regional S 'or: Date: S
Permits & ngineering: Date:-�ohl
MAY 14 1991
RETURN TO TECHNICAL SERVICES BY: : r F
Water Qua;icy Sc-
1
• 1nr�jnn^� '.t
itr�sAw

0
Existing Limits:
Wasteflow (MGD):
BOD5 (mg/1):
NH3N (mg/1):
DO (mg/1):
TSS (mg/1):
Fecal Col. (/100 ml):
pH (SU):
Oil & Grease (mg/1):
TP (mg/1):
TN (mg/1):
Residual Chlorine (µg/l):
Recommended Limits:
Wasteflow (MGD):
BOD5 (mg/1):
NH3N (mg/1):
DO (mg/1):
TSS (mg/1):
Fecal Col. (/100 ml):
pH (SU):
Oil & Grease (mg/1):
TP (mg/1):
TN (mg/1):
Residual Chlorine (µg/1):
Toxicity Test:
PARAMETERS
Monthly Average
0.0057
30.0
monitor
30.0
1000.0
6.0-9.0
monitor
with Ammonia Limit
0.0057
30.0
18.0
30.0
200.0
6.0-9.0
monitor
Monthly Averages
OR
with Toxicity T,6st
0.0057
30.0
monitor
30.0
200 � Vil
6. -9.0 �t�
monitor
@a 4.4%

'
'
.
. .
.
'CKEX88/MP
O5/O3/9i
COMPLIANCE
EVALUATION
ANALYSIS
REPORT
PAGE i
PERMIT--NCO066796
PIPE--OOi
REPORT
PERIOD:
9004-9103
LOC---
E
FACILITY --BUNCOMBE
CO.-LEICE%TER
E%
DESIGN FLOW--
.0057
CLASS-,.)
LOCATION--A%HEVILLE
REGION/COUNTY--0i
BUNCOMBE
50050 00310
00530
00610
31616
50060
OOOiO
OO4O0
MONTH
Q/MGD
BOD
RE%/T%% NH3+NH4-
FEC
COLI
CHLORINE
TEMP
PH
LIMIT F
.8057 F 30.00
F 30.0
NOL
F 1000.0
NOL
NOL
9.0 6.O
90/04
.0040
1.30
2.5
.40
20
.490
17.00
6.4-6.4
90/05
.1040
.75
LE%%THAN LE%%THAN
LE%%THAN
.490
17.00
90/06
.0050
2.70
5.0
.60
LE%%THAN
.8O0
17.50
9O/O7
90/38
.0025
1.40
6.5
.20
LE%%THAN
.700
18.00
6.3-6.2
90/09
.0050
7.00
9.8
3.30
283
.510
18.00
6.4-6.4
90/10
.0050
8.35
1010
2.30
LE%%THAN
.500
18.00
7.2-6.8
90/11
.8037 18.50
4.8
14.10
281
.390
15.00
6.6-6.6
90/12
.0020 14.20
9.0
16.90
71
.500
10.00
91/01
.0030
8.60
4.5
i.70
70
.600
9.00
1.0-6.9
91/02
.0830
.60
2.5
1.00
32
i.iOO
11.00
6.0-6.O
9i/83
.0830
3.45
4.5
.9O
50
i.iOO
12.08
6.0-6.0
AVERAGE
.0036
6.07
5.9
4.14
ii5
.652
i4.77
________
MAXIMUM
.0050 18.50
iO.O
16.90
283
1,100
18.00
7.20O
MINIMUM
.0020
.60
LE%%THAN LE%%THAN
LE%%THAN
.390
9.00
6.008
UNIT
11GD
MG/L
MT/L.
MC/L
0/100ML
MG/L
DEG.0
%U

0
State of North Carolina
Department of Environment, Health, and Natural Resources
Division of Environmental Management
512 North Salisbury Street • Raleigh, North Carolina 27611
James G. Martin, Governor George T. Everett, Ph.D.
William W. Cobey, Jr., Secretary Director
April 15, 1991
Mr. V.E. Yarbrough
Buncombe County Board of Education
Post Office Box 15055
Asheville, North Carolina 28813
Subject: Chlorine Toxicity
NDPES Permit No. NCO066796 - Buncombe County/Leicester Elementary School
Buncombe County
Dear Mr. Yarbrough:
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 µg/l (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
°z 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 its NPDES permit renewal process.
Our records indicate that chlorine from your facility's effluent discharge may be toxic to aquatic
life in the receiving stream under low flow conditions, i.e., the amount of chlorine discharged causes
an exceedance of the instream criteria for chlorine (17 µg/l for chronic effects and 28 99/1 for acute
effects) 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. An acceptable level of chlorine in your effluent is 28 µg/1 or 0.028 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.
Pollution Prevention Pays
P.O. Box 27687, Raleigh, North Carolina 27611-7687 Telephone [phone]
An Equal Opportunity Affirmative Action Employer

-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 facilities with chlorine
problems. If the chlorine levels in your facility's effluent remain unchanged, a chlorine limit or
whole effluent toxicity requirement may be added to your permit limitations.
Please feel free to call Mr. Forrest Westall of the Asheville Regional Office at [phone], if
you have any questions or comments regarding this issue.
SWT/DAQ
cc: Asheville Regional Office
Central Files
Sincerely,
C'
teve W. Tedder
Water Quality Section Chief
Pollution Prevention Pays
P.O. Box 27687, Raleigh, North Carolina 27611-7687 Telephone [phone]
An Equal Opportunity Affirmative Action Employer

LEICESTER ELEMENTARY SCHOOL - Allowable Waste Concentrations
Residual Chlorine
Ammonia as NH3
7Q10 CFS)
0.19
7010 (CFS)
0.19
DESIGN FLOW MGD
0.0057
DESIGN FLOW MGD
0.0057
DESIGN FLOW (CFS)
0.008835
DESIGN FLOW (CFS)
0.008835
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 %
4.4433827
IWC %
4.443383
Allowable Concentration u /I
382.5914
Allowable Concentration rn /I
17.77419
NC0066796 DAG 4/9/91