NC0044954_Wasteload Allocation_19910619

NPDES DOCIMENT SCANNING COVER SHEET
NC0044954
South Stokes High School
NPDES Permit:
Document Type:
Permit Issuance
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Complete File - Historical
Engineering Alternatives (EAA)
Correspondence
Owner Name Change
Staff Report
Instream Assessment (67b)
Speculative Limits
Environmental Assessment (EA)
Document Date:
June 19, 1991
This document is printed on reuse paper - ignore any
content on the re-werse side

NPDES WASTE LOAD ALLOCATION
PERMIT NO.: NC0044954
PERMI I"ICE NAME: Stokes County Board of Education / South Spa
Sao t
Facility Status: Existing
Permit Status: Renewal
Major Minor
Pipe No.: 001
Design Capacity: 0.0173 MGD
Domestic (% of Flow):
Industrial (% of Flow):
Comments:
100 %
n/a %
Refer : Basinwide / Streamline WLA File
Completed By Permits & Engineering
At Front Of Subbasin
RECEIVING STREAM: Little Neatman Creek
Class: C
Sub -Basin: 03-02-01
Reference USGS Quad:
County: Stokes
Regional Office:
B18SW
Winston-Salem Regional Office
(please attach)
Previous Exp. Date: 1/31/92 Treatment Plant Class: 1
Classification changes within three miles:
No change within three miles.
Requested by:
Prepared by:
Reviewed by:
Mack Wiggins
ne JJ- `Yo wwt
135
w6-L_ E t,
Date:
Date:
Date: Cil9lal
2/6/90
CO
Modeler
Date Rec.
#
EA
51 C IQI
C.ZZS
Drainage Area (m. ) , a. C7 Avg. Streamflow (cfs):
7Q10 (cfs) O.? 7 Winter 7Q10 (cfs) o. 30Q2 (cfs) 0. 7Z
Toxicity Limits: IWC 9 %
Instream Monitoring:
Parameters
Upstream Location
Downstream Location
Acut Chronic)
Effluent
Characteristics
-.Summer
Wintep-
BOD5 (mg/1)
3o
NH3-N (mg/1)
►N.o.+; k o.-
D.O. (mg/1)
TSS (mg/1)
-3 0
F. Col. (/100 ml)
ac o
pH (SU)
e, -9
..A,t.le, ivv_ C.tin t A ''')
v-no ....„.,
flTTrL
J6ii..,,,,..
Comments: ?bxiefty TEST MAX Bf 7i2cPPED 42ie2 1 yP E
iT .Y avisecuAw mosses. M

-1-
Request No. 6228
FACT SHEET FOR WASTELOAD ALLOCATIONS
Facility Name :South Stokes High School
NPDES No. :NC0044954
Type of Waste :Domestic
Facility Status :Existing
Permit Status :Renewal
Receiving Stream :Little Neatman Creek
Stream Classification:C
Subbasin
County
Regional Office
Requestor
Date of Request
Topo Quad
:03-02-01
:Stokes
:Winston-Salem
:Mack Wiggins
:2/6/91
:B18SW
Wasteload Allocation Summary:
RECEIVED
Nt. Dept. NRCD
MAY 21 1991
Winston-Salem
.."i'ill�or „i',•,h'�''>.1^ Regional Office
JUN 1 l291
Stream Characteristics:
USGS #02.0688.9131 Date 1989
Drainage Area: 2.07 sq.mi.
Summer 7Q10: 0.27 cfs
Winter 7Q10: 0.68 cfs
Average Flow: 2.4 cfs
30Q2: 0.72 cfs
Facility meets existing limits. Permit renewal under basin schedule.
Allowable ammonia: 8.85 mg/1, summer and 41.87 mg/1, winter. Recommend
toxicity testing since facility cannot meet a summer limit of 8.8 mg/1.
Facility will receive a letter addressing chlorine toxicity. Dilution is
11:1.
(approach taken, correspondence with region, EPA, etc.)
>117
4/i .4'40 % {SP 41-,- /4.4c/JL . lF
10e ,6't'r//./y (Qrr i'r 740 frelss a e"/rd/7ir of
f4 , , ���d� �f/'9' 7�i�� �vx�ri j �ui�s mod-
r �i.�� Gd�% f � /,w' <t'):75
WASTELOAD SENT TO EPA?(Major)_N_ (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 fits into basinwide plan)
ADDITIONAL "REVI ER" COMMENTS: / ..t5; ,I, ‘e"�r 7‘ 1i/
Recommended by:
Reviewed by
Instream Assessment:
Regional Supervisor:
Permits & Engineering:
D. 5 e o (41(„
RETURN TO TECHNICAL SERVICES BY:
JUN 15 1991
Date: -s/7 77/
Date: .511t 111
Date: 611-(7- 9
Date:

-2- Request No. 6228
Existing Limits
Wasteflow (MGD) :
BOD5 (mg/1) :
NH3N (mg/1) :
DO (mg/1):
TSS (mg/1) :
Fecal Coliform (/100 ml) :
pH (SU) :
Chlorine (mg/1) :
Recommended Limits
Wasteflow (MGD) :
GODS (mg/1) :
NH3N (mg/1):
DO (mg/1) :
TSS (mg/1) :
Fecal Coliform
pH (SU) :
Chlorine (mg/1) :
CONVENTIONAL PARAMETERS
Monthly Average
Summer/Winter
.0173
30
monitor
30
200
monitor
Monthly Average
Summer/Winter
.0173
30
monitor
30
(/100 ml) : 200
monitor
Daily Maximum
Limits Changes Due To: Parameter(s) Affected
Instream Data
Ammonia Toxicity
Chlorine
New facility information
Flow information
INSTREAM MONITORING REQUIRMENTS:
Upstream: no Location:
Donwstream: no Location:
TOXICS
Toxicity Limit: Chronic, Qaurterly at 9%
Schedule: FEB, MAY, AUG, NOV
NH3-N
6-9
6-9

% �Nrrtc3K� G. o x i v
10/89
LL
Facility Name 5C4 S-f'ke_s `I�t t Pcriuit keoc yy95-,/
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 *September 1989) or subsequent versions.
The effluent concentration at which there may be no observable inhibition of reproduction or
significant mortality is , °l % (defined as treatment two in the North Carolina procedure
document). The permit holder shall perform guarter(v monitoring using this procedure to establish
comphance.trrth the permit condition. The. first test will be performed after thirty days from
issuance of this permit during the months of Fi 13 M tkUlr, 1J0 .
Ah', , .Effluent
sampling for this testing shall be performed at the NPDES permitted final effluent discharge below
all treatment processes. •
All toxicity testing results inquired as partof 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
codeirsP3B. 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 quart terly in the months specified above.
Should any test data from this ronitoring 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 D. o/'7 cfs
Perms ted Flow O. 0173 MGD
IWC%
Basin & Sub -basin 03 -02- b i
Receivin Stream (. �-tlfe ere/
County 6 j Date
Recommended by:
-7/6///
**Chronic Toxicity (Ceriodaphnia) P/F at 9 % mA,, 0,i.S6✓, See Rut ja. Condition
H

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Ala c! 5-✓.Le c — ya �
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4/ I t Gw J cj 1
5 tL �q �7 cox 7 r
1iN
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7Q 1 D,,,, " 0, tar { •,
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36D s kc y /1
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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 May 20, 1991 Director
Sherrill Doby
Stokes County Board of Ed. - South Stokes High School
P.O. Box 50
Danbury, NC 27016
Subject: Chlorine Toxicity
NPDES Permit No. NC0044954
Stokes County
Dear Ms. Doby:
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 1\ I 'I )ES
permit renewal process.
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 for
chronic effects or 28 ug/1 for acute effects) under 7Q10 conditions. An acceptable level of
chlorine in your effluent is 28 ug/1 or 0.028 mg/1. Action should be taken to reduce the
effluent concentration of chlorine to an acceptable level. 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
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 (919) 896-
7007 if you have any questions or comments regarding this issue.
Sincerely,
Steve Tedder
Water Quality Section Chief
SWT/eaj
cc: Winston-Salem Regional Office
Central Files
Pollution Prevention Pays
P.O. Box 27687, Raleigh, North Carolina 27611-7687 Telephone [phone]
An Equal Opportunity Affirmative Action Employer

•
cc: Technical Support Branch
Permits and Engineering
County Health Dept.
Central Files
WSRO
JUL
Date July 1, 1991
NPDES STAFF REPORT AND RECOMMENDATIONS
County Stokes
NPDES Permit No. NC0044954
PART I - GENERAL INFORMATION
1. Facility and Address:
South Stokes High School
Stokes County Board of Education
P. 0. Box 50
Danbury, N.C. 27016-0050
2. Date of Investigation: June 24, 1991
3. Report Prepared by: Abner Braddy
4. Persons Contacted and Telephone Number:
Mr. Jack Maranville - [phone]
5. Directions to Site:
From Winston-Salem travel N.C.
N.C., continue north on N.C. 8
1975; turn left (west) on S.R.
1 mile; the school entrance is
6. Discharge Point - Latitude:
Longitude:
1 0 1991
8 North through Germanton,
to its intersection with S.R.
1975 and travel approximately
on the left.
36, 19' 24"
80 14' 20"
Attach a USGS Map Extract and indicated treatment
plant site and discharge point on map.
USGS Quad No. B-18 SW or
USGS Quad Name Walnut Cove
7. Size (land available for expansion and upgrading):
There appears to be adequate land available for expansion if
needed.
8. Topography (relationship to flood plain included):
The topography in the area varies from slightly sloped to
severely sloped. The plant is in a slightly sloped area
(<10,3) which falls away to the Little Neatman Creek. The
plant is located outside the flood plain.
9. Location of nearest dwelling: None within 1000.0 feet.

10. Receiving stream or affected surface waters: Little Neatman
Creek
a. Classification: C
b. River Basin and Subbasin No.: 03-02-01 Roanoke
c. Describe receiving stream features and pertinent
downstream uses: Little Neatman Creek is a rural
watercourse with no known major discharges tributary to
it. It is most likely greatest impacted by non -point
sources of pollution. It is suitable for secondary
recreation and fish propagation, consistent with its "C"
classification.
PART II - DESCRIPTION OF DISCHARGE AND TREATMENT WORKS
1. Type of wastewater: 100% Domestic
% Industrial
a. Volume of Wastewater: 0.0173 MGD (Design) 0.0135
(Average Flow)
b. Types and quantities of industrial wastewater:
None
c. Prevalent toxic constituents in wastewater:
None Known
d. Pretreatment Program (POTWs only): N/A
in development approved
should be required not needed
2. Production rates (industrial discharges only) in
pounds: N/A
a. highest month in the last 12 months
b. highest year in last 5 years
3. Description of industrial process (for industries only)
and applicable CFR Part and Subpart: N/A
4. Type of treatment (specify whether proposed or
existing):
Existing - 19,800 gallon capacity septic tank; 8,640 gallon
capacity dosing tank. 2,704 square foot surface sandfilter;
sanuril-type chlorinator and contact chamber.
Proposed,- sanuril-type dechlorinator.

5. Sludge handling and disposal scheme:
Septic tank pumped as needed by septage hauler.
6. Treatment plant classification: 1
7. SIC Code(s) 8211
Wastewater Code(s) 03
PART III - OTHER PERTINENT INFORMATION
1. Is this facility being constructed with Construction
Grants Funds (municipals only)? N/A
2. Special monitoring requests: None
3. Additional effluent limits requests: None
4. Other:
PART IV - EVALUATION AND RECOMMENDATIONS
The system appeared to be in a somewhat better state of
repair in comparison with past site visits. As previously noted,
the School system, has submitted plans to obtain an Authorization
to Construct a tablet -type dechlorinator.
Some algal growth was noted in the stream at the point of
discharge.
The Region recommends the Permit be renewed.
Signature of report prepa
7-2 -9/
Water Quality Su rvisor