NC0046426_Wasteload Allocation_19920824

NPDES WASTE LOAD ALLOCATION
PERMIT NO.: NC0046426
PERMTITEE NAME: Wilkes County Board of Education
FACILITY NAME: Traphill Elementary School
Facility Status: Existing
Permit Status: Modification
Major Minor '1
Pipe No.: 001
Design Capacity: 0.004 MGD
Domestic (% of Flow): 100 %
Industrial (% of Flow):
Comments:
Change in discharge location.
RECEIVING STREAM: Little Sandy Creek
Class: C
Sub -Basin: 03-07-01
Reference USGS Quad: B14SE (please attach)
County: Wilkes
Regional Office: Winston-Salem Regional Office
Previous Exp. Date: 4/30/94 Treatment Plant Class: 1
Classification changes within three miles:
No change within three miles.
Requested by: Mack Wiggins Date: 8/20/92
Prepared by: (.4,o41," 4. A,. � Date: Lo /vt /q
Reviewed by: /?,/A_, Date: l'1,
�op, (35 (5/0 —
1QLEt _6
Modeler
Date Rec.
#
SAv3
B(vd47--
lo9A
Drainage Area (mi2 ) 2. LJ Avg. Streamflow (cfs):
7Q10 (cfs) 0.41 Winter 7Q10 (cfs) 0.7g 30Q2 (cfs)
Toxicity Limits: IWC % Acute/Chronic
Instream Monitoring:
Parameters
Upstream Location
Downstream Location
Effluent
Characteristics
Summer
Winter
BOD5 (mg/1)
30
30
NH3-N (mg/1)
D.O. (mg/1)
TSS (mg/1)
2J O
3 O
F. Col. (/100 ml)io
o
7.06
PI_ - TIED
Comments: 1Z4-wc -rtoh1 Fizonti (. I

TRAPHILL QUADRANGLE
NORTH CAROLINA
7.5 MINUTE SERIES (TOPOGRAPHIC) <?,oP
498 999 1410 000 FEET 8; ° 00'
- 36 ° 22'30"
41
960 000
FEET
'a 7
r:3'
r
cn
isl+'
-1: -= 'I
.._ 1 C-
CO

RECEIVED
N.C. Dept. of EHNA
FACT SHEET FOR WASTELOAD ALLOCATION
Facility Name:
NPDES No.:
Type of Waste:
Facility Status:
Permit Status:
Receiving Stream:
Stream Classification: C
Subbasin:
County:
Regional Office:
Requestor:
Date of Request:
Topo Quad:
Traphill Elementary
NC0046426
Domestic - 100%
Existing
Renewal
Little Sandy Creek
030701
Wilkes
WSRO
M Wiggins
8/20/92
B14SE
O C T 14 1992
Winston-Salem
Request # 7081 Regional Office
Stream Characteristic:
USGS #
Date:
Drainage Area (mi2):
Summer 7Q10 (cfs):
Winter 7Q10 (cfs):
Average Flow (cfs):
30Q2 (cfs):
IWC (%):
HA 10 est.
2.11
0.49
0.78
3.12
Wasteload Allocation Summary
(approach taken, correspondence with region, EPA, etc.)
Traphill Elem. is currently under an SOC. In 1990 a new WLA was completed giving the facility
the zero flow policy. They are required to seek an alternative to discharge or move the current
discharge location. Traphill proposes to move the discharge location directly to Little Sandy Creek
(from a UT). NI,hme_ LtviL an.e
h,
Special Schedule Requirements and addition 1 comments from Reviewers:
Recommended by:
Reviewed by
Instream Assessment:(iJJ#_1/ / Date: lOP/�1
Regional Supervisor: - Date: /o/j y9 '-
Permits & Engineering: Date:
NOV 0 4 1992
RETURN TO TECHNICAL SERVICES BY:
�
Date: 9711A

2
Existing Limits:
Wasteflow (MGD):
BOD5 (mg/1):
NH3N (mg/1):
DO (mg/1):
TSS (mg/1):
Fecal Col. (/100 ml):
pH (SU):
Residual Chlorine (14/1):
Oil & Grease (mg/1):
TP (mg/1):
TN (mg/1):
Recommended Limits:
Wasteflow (MGD):
BOD5 (mg/1):
NH3N (mg/1):
DO (mg/1):
TSS (mg/1): 30 30
Fecal Col. (/100 ml): 200 200
pH (SU): 6-9 6-9
Residual Chlorine (µg/1):
Oil & Grease (mg/1):
TP (mg/1):
TN (mg/1):
CONVENTIONAL PARAMETERS
On the UT Little Sandy Creek
Monthly Average
Summer Winter
0.004 0.004
20 30
13 monitor
6 6
30 30
200 200
6-9 6 -9
On Little Sandy Creek
Monthly Average
Summer Winter WQ or EL
0.004 0.004
30 30 el
Monthly Average
Summer Winter
0.004 0.004
5 10
1 1.8
6 6
30 30
200 200
6-9 6-9
28 28
Facility may be required to meet a chlorine limit in the future. Since the plant is not being
upgraded, no chlorine limit will be required at this time.
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
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.
Parameter(s) Affected
BOD5, NH3-N
OR
X No parameters are water quality limited, but this discharge may affect future allocations.

•
3
INSTREAM MONITORING REQUIREMENTS
Upstream Location:
Downstream Location:
Parameters:
Special instream monitoring locations or monitoring frequencies:
MISCELLANEOUS INFORMATION & SPECIAL CONDITIONS
Adequacy of Existing Treatment
Has the facility dempnstrated the ability to meet the proposed new limits with existing treatment
facilities? Yes No
If no, which parameters cannot be met?
Would a "phasing in" of the new limits be appropriate? Yes No
If yes, please provide a schedule (and basis for that schedule) with the regional
office recommendations:
If no, why not?
/1/attr Avi sh
c AR5 90,,'t.
Qet ciA-1'i o n)
0-4
Special Instructions or Conditions
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 it fits into basinwide plan)
Additional Information attached? N (Y or N) If yes, explain with attachments.

N Coo 2h
-TRAM AM LL- - - .
� t � sk y c
sPAR-v-s
lan
'l(9 a
r23o7oj
--- pruposev s Ct{Aa4.G (tea L i)r
-TAPF!r i-. a-ovw
4PF : 0. 0 M4 P
DA
79105-0.4-c't c4s
7q tow 010 c(s
3og2- 1-±017 's
Q1'id5 = 3. 12 c�-5
r,sctlA-t is' jAi T4G 4$q5 _1-1AtQ 4-gear /NS. (/14A50N q E(sG et/A- s)
L 4„- r3� ucep Fog_ CAtcu Lhrtac F14141.9.
79Jos0.155MA-F ,. °'
0 9g
7?!o�_ o L Af
30 - _0 344 _. NAP "
/146f - M
/•48 (log 121sc,N. ?vi 17)
A/44: (ro Pvr,JA1.5 / f/::-w/1 r)
at i 5 L' u,e-\M l -uNP (1,0 , New PA-4 _ rA✓As -
exile Fc.576 SI vIC 77/(5- C f
P-lam - ..,�o ILLm/ f' -t C 1
S Ce -//? c ro A Gt. 7- o L r ri- bE v514 A/ Y (.20

SL©PS
7q:9,,QO
•
0.2
r.2.7
a •-•�,
¶c J 1- & M
7 o. 00f M'D
'7Qics=o•42$
10,42 0..78
1- l•07d:
1044 3.c2
b.96 - o.z11
77losi?-o' 2.35 0.Z c�.%
f!. 51 -0.78
% Q / 0..✓ I%o = ---- 3S - 51
•I - 3.{2
7/ F :: a =
Z•35 f • 2rj c-s/nt..
(.AU-19 Abt.-g) 6 5 7 7 I.-1,v I 7
:-(-1:4✓A&LL) = 29 fNo [L L1r4 ;Jusr A ?ire 1.c4oc.f i2A.i
`.ou IS %Vpc.r6486E

C
0
d
Strcq.m '
1,,Trri-
2- 3
I

SUMMER
QEFF=0.004 MGD, BOD5=30 MG/L
MODEL RESULTS
Discharger : TRAPHILL ELEM
Receiving Stream : LITTLE SANDY CRK
The End D.O. is 8.13 mg/l.
The End CBOD is 1.68 mg/l.
The End NBOD is 0.95 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
Reach 2
Reach 3
.c.A.00 f L-`f 1.l1/4 ¶Y5
45.00
0.00
0.00
SP(vEri7 Prs' I`OiaNl Ll.
caciATA 41
90.00
0.00
0.00
0.00
0.00
0.00
0.00400
0.00000
0.00000

*** MODEL SUMMARY DATA ***
Discharger : TRAPHILL ELEM Subbasin : 030701
,Receiving Stream : LITTLE SANDY CRK Stream Class: C
Summer 7Q10 : 0.49 Winter 7Q10 : 0.78
Design Temperature: 25.0
!LENGTH' SLOPE' VELOCITY I DEPTH' Kd I Kd I Ka 1 Ka 1 KN I
I mile I ft/mil fps I ft Idesign l @20' Idesign l @201/2 'design!
1 1 1 1 1 1 1 1 I
Segment 1 I 0.301 44.001 0.151 10.48 10.47 10.37 113.33 111.961 0.73
Reach 1 1 1 1 1 1 1 1 1 I
Segment 1
Reach 2
I 1 1 1 1 1 1 1
0.301133.001 0.217 10.42 10.64 10.51 155.75 1 50.001 0.73
1 1 1 1 1 1 I
Segment 1 1.75 40.001 0.173 10.55 1 0.46 10.36 113.86 112.431 0.73
Reach 3 1 1 1 1 I 1 I
I Flow I CBOD 1 NBOD I D.O. I
I cfs I mg/1 1 mg/1 I mg/1 I
Segment 1 Reach 1
Waste 1 0.006 145.000 1 90.000 I 0.000
Headwaters) 0.490 I 2.000 1 1.000 I 7.440
Tributary 1 0.000 I 2.000 I 1.000 I 7.440
* Runoff 1 0.200 I 2.000 1 1.000 I 7.440
Segment 1 Reach 2
Waste I 0.000 I 0.000 1 0.000 I 0.000
Tributary 1 0.000 I 2.000 I 1.000 I 7.440
* Runoff 1 0.200 1 2.000 I 1.000 I 7.440
Segment 1 Reach 3
Waste I 0.000 I 0.000 I 0.000 I 0.000
Tributary 1 0.000 I 2.000 I 1.000 I 7.440
* Runoff 1 0.200 I 2.000 I 1.000 1 7.440
* Runoff flow is in cfs/mile

SUMMER
QEFF=0.004 MGD, BOD5=30 MG/L
I Seg # I Reach # I Seg Mi I D.O. I CBOD I NBOD I Flow I
1 1 0.00 7.35 2.54 2.11 0.50
1 1 0.03 7.45 2.52 2.08 0.50
1 1 0.06 7.54 2.50 2.05 0.51
1 1 0.09 7.62 2.48 2.02 0.51
1 1 0.12 7.68 2.46 1.99 0.52
1 1 0.15 7.74 2.44 1.96 0.53
1 1 0.18 7.79 2.42 1.93 0.53
1 1 0.21 7.82 2.40 1.90 0.54
1 1 0.24 7.86 2.38 1.88 0.54
1 1 0.27 7.89 2.36 1.85 0.55
1 1 0.30 7.91 2.35 1.83 0.56
1 2 0.30 7.91 2.35 1.83 0.56
1 2 0.33 8.02 2.33 1.81 0.56
1 2 0.36 8.09 2.31 1.79 0.57
1 2 0.39 8.13 2.30 1.77 0.57
1 2 0.42 8.16 2.28 1.75 0.58
1 2 0.45 8.17 2.27 1.73 0.59
1 2 0.48 8.18 2.25 1.71 0.59
1 2 0.51 8.19 2.24 1.69 0.60
1 2 0.54 8.19 2.22 1.68 0.60
1 2 0.57 8.20 2.21 1.66 0.61
1 2 0.60 8.20 2.20 1.64 0.62
1 3 0.60 8.20 2.20 1.64 0.62
1 3 0.78 8.13 2.12 1.54 0.65
1 3 0.95 8.10 2.06 1.44 0.69
1 3 1.13 8.10 2.00 1.36 0.72
1 3 1.30 8.10 1.94 1.28 0.76
1 3 1.48 8.11 1.89 1.21 0.79
1 3 1.65 8.11 1.84 1.15 0.83
1 3 1.83 8.12 1.80 1.09 0.86
1 3 2.00 8.12 1.75 1.04 0.90
1 3 2.18 8.13 1.71 0.99 0.93
1 3 2.35 8.13 1.68 0.95 0.97
I Seg # I Reach # I Seg Mi I D.O. I CBOD I NBOD I Flow I

cc: Technical Support Branch
Permits and Engineering
County Health Dept.
Central Files
WSRO
ECtEiVir'
S EP 0 ; 1992
TECHNICAL SUPPORT BRANCH
Date August 30, 1992
NPDES STAFF REPORT AND RECOMMENDATIONS
County Wilkes
NPDES Permit No. NC0046426
PART I - GENERAL INFORMATION
1. Facility and Address:
Traphill Elementary School
Wilkes County Board of Education
201 W. Main Street
Wilkesboro, NC 28697
2. Date of Investigation: 08-27-92
3. Report Prepared by: David Russell, WSRO
4. Persons Contacted and Telephone Number: Via telephone
08-27-92 Keith Lenderman, ORC [phone]
5. Directions to Site:
From North Wilkesboro travel Hwy 18 North to
Fairplains. Turn right on SR 1002 and travel
approximately 15 miles to the Traphill community.
The school is located on the right.
6. Discharge Point - Latitude: 36° 20' 45"
Longitude: 81° 01' 46"
Attach a USGS Map Extract and indicated treatment plant
site and discharge point on map.
USGS Quad No. B 14SE or USGS Quad Name Traphill
7. Size (land available for expansion and upgrading):
10.6 acres are owned by the school system.
8. Topography (relationship to flood plain included): The
WWTP is located well above the flood plain of the
receiving stream.
9. Location of nearest dwelling: Within 1000 feet to
North of WWTP.

10. Receiving stream or affected surface waters:
Little Sandy Creek.
a. Classification: C
b. River Basin and Subbasin No.: YAD 01
c. Describe receiving stream features and pertinent
downstream uses: The stream flows through rural
Wilkes County.
PART II - DESCRIPTION OF DISCHARGE AND TREATMENT WORKS
1. Type of wastewater: 100% Domestic
% Industrial
a. Volume of Wastewater: 0.004 MGD (permitted flow)
b. Types and quantities of industrial wastewater:
c. Prevalent toxic constituents in wastewater:
d. Pretreatment Program (POTWs only)
in development
should be required
approved
not needed
2. Production rates (industrial discharges only) in pounds
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:
4. Type of treatment (specify whether proposed or
existing): (0.004 mgd) Bar screen, aeration basin,
clarifier, aerated sludge holding tank, chlorination,
Flow is measured by meter on well.
5. Sludge handling and disposal scheme:
The school board's pump truck pumps solid froni the
system.
6. Treatment plant classification: II
7. SIC Code(s) 8211
Wastewater Code(s)
Mrlk.06o_7

PART III - OTHER PERTINENT INFORMATION
1. Is this facility being constructed with Construction
Grants Funds (municipals only)?
2. Special monitoring requests:
3. Additional effluent limits requests:
4. Other:
PART IV - EVALUATION AND RECOMMENDATIONS
This application is for the relocation of the effluent
discharge from an UT to Little Sandy Creek to Little Sandy
Creek. The proposed discharge location is at the SR 1002
bridge crossing the creek. The discharge pipe will follow
the road right of way approximately 1/2 mile to the creek.
This school is covered by an SOC signed by the Director
920317. The existing discharge is into a zero flow stream
which requires very stringent final limits. Final limits
are to be met by 931231 based on the schedule in the SOC.
Self -monitoring data July 1992 - May 1992 indicates SOC
limits have consistently been met.
Recommend the permit be issued.
a % C.(,,,,"/6(
�Z-d 3r
i nature of report preparer

!3t ttige
•„
r13bN;;
tt
if
•
to.
It
LowGap 1 L
v . '11r \.
0 0
0 jy • .• '
• !.-..)
\
.r. / $M
i 1292 ;. \.
e

Cana
e f- envl.sm�•'-^'r-'nt:al Management
- checklist of Fac Components
To be Used In Determing F ty Classification
Ail information will be printed:
4awe of Plant f /e rt e_,./AP.lq S )c /
l
:aunty (Ni ikes
:rfner or Contact Person t t/ ( LeN+'g,.,Evj/0
��// // /� el��hone
'failing Address i 0I L" i�i4%� Sr W; iL'e.shot.o N•C• �...-� �"%
Street or P.O. Bo�C No. Town of City -i p
Permit Number Information Construction Status
NPDES Permit No. lit C ,3 d C/(''/ 2 lv Please Check:
Existing Facilityy
Date Issued Upgraded Facility
New Facility
State Permit No. If Jpgraded or New Facility, Give:
50t Completion Date
Date Issued 100: Completion Date
Rated by. (J�rtrr al LSS2 + Regional f Re ional Office 6-)SR e Date a~ 2S--tr D
i/ Au f1A.Qhrr+N Grace 11_.
Operator in Responsible Charge Qf �
Design Flow of Plant in GAB D. 00 gift.f d. Plant Class
1TEM
POINTS
PRETREATMENT un1TS (see definition so. 34) 2
2, 1ESi0N FLOW OF it,AAT IN CFO (rot apo:l:able to non -
contaminated cooling raters and non -discharging systems) fir]
0 •- 20.000 C1tJ
20.001 •- 50.000
S0.001 -- 103.003 3
103.001 -- 250.000 4
250.001 •• S00.000 S
S00.001 -- 1.000.000
1.000.001 -- 2.000.000 10
2.000.001 (and up) • rate 1 point additional for ea:h 203000
CPO capacity eo to 4 0e410.R of . . 30
Design Flow (CPO):
:3; PRELIMINARY uniit (see definition 1G. 351
(a) Influent Pups (including air lift)
(e) far Screens
Or
(c) Mechanical Screens. Static Screens or Cominuting
Devices
(d) Grit Removal or
(e) Mechanical or Aerated Grit Panora!
(f) F1w measuring Device or
(g) instrumented Flew Measureaer.-
• :23
ITEM
(h) P ion or Equalization
(1) Grease or 011 Separators -- Gravity 3
*ecnanical 3
Aerated
u) Chemical Condittoning S
PRINAA1 TREAi0ENT UNITS 2
(a) Septic Tank (set definition 'me. 44) 3
(b) Imhoff Tank
(c) Primary Clarifiers (including sludge air lifts) . S
(d) Settling hods or Settling Taus for Inorganic Non -
Tonic Materials Involving a 1I.charge to the Surface
utters (sand. gravel. stone. and other siring operations
except recreational activities such as gsa or gold. 10
mining)
e-1 SECo*OART TREATMENT UNITS
(a) Carbonaceous Stage
Mechanical Air System (f
(1) Aeration - Mlgh Purity 0nygeo System . . .
Diffused Air System fixed. floating or rotor Separate Sludge Reatration r . . . 33
(11) irictling Filter • iceStanRateard Ratt 7
Packed Tower S
(111) aerated Lagooro IO
(Iv) Rotating Biological Contactors (blodise)• . 10
(v) Sand Filters (Inta■ittent biological) • . . 2
(vl) Stabilization Lagoons with Outlet to Stream .
(via) Clarifier (lacludIn9 sludge air lift). • -
(b) Nitrogenous StageSip
(I) Aeration • Nigh Purity Cayges System l0
Diffused Air Systems.. . . . .
Mechanical Air System (filed. floating. orrotor)11
Separate Sludge Re ton 7
(11) Trickling Filter - Nigh Rate 5
Standard Rate
Packed Tower. . ... . S
(111) Rotating Biological Contactors (blodlsc) 10
(art Sand Filter (tntereittent biological)2
(-. Clarifier (including sludge air lifts) . . S
.a: TERTIARY 0R AOTANCE() 'WOW umITS
(a) Activated Carbon Veda - Vithart Carb00nth Carbon egregengrl%Iow 1S
(b) Powdered or Granular Activated Carbon Feed - Without
Carbon regeneration ... S
With Carbon regeneration13
(c) Ammonia Str19ptmp 111
(d)Chemical Addttloes
(el Oenttriflatlos Process (separate process). • . • 10
if) Electrodtalysls S
g) Foam Stparettoe S
e
2
1
2
h) Ion Eschange
• 7-
PSIMTS
Ate mr.%aon re. 23b:
(rot aooio:emit •sr 'r. !oyes Inc.? :Ora,
1leroscreet . . . .
alosphorus :wove
Polishing =:nos- aeratior
r1? rern:ion
Pest aersti:n - _asaoe . . .
-•!r-.•.n or mecnanMul
Pre-Pacea:t ell r:- kre.1. 0, Or art !.ease
Re _:m:s1s
Sand or surd -sera 1 term .. toot :rate .
rig: Pate
(71 > .SCE :tEATMEs-
a shag, C155et :1:• 'est •- *taw . . .
-nneatee .
Sludge S:1:111:a:1t- hwltal or %lemma'
Sludge 2?.' s Sets
, Sludge E1.tr1a1•1-
:e:n Sludge Cargill:nit.::sera+tat or thermal' .
r• :1,42e m3:tear
:i Sludge Sas ztli-catim including gas s need
Sludge holding 'am -- aerated
von -aerated
':i Sludge Potnerl:rr one: includisg activate: taroom
-egeneration) . -
1C
'` :e
Titus. Filter.ntr''age or Filter Press . . . 10
nc:udinl•+csnerated ash)
1_ �eE DISPOSAL (t 2
:) Lagoons
Land Apptleatios (� ate and sussurface' :set def. .0
':) Landitlled (o•^`a11 .5
::S:NFECTION 1
'a) Ire
':) Inter*meiate . .
::1 Post
':) Dedllortsatior. 5
.e) Chlorins or 0w-a ;r...atlas 3
.r) Radiasior . . . . . . . . . . . .
•:S.ELLAMEDLS 47t1TS
'11 molding Ponds :• ec:r 'g Tents fa. iror're• :. son-tos1e
materials *1u no C•:cnaree 10 the Surface da:ers 2
(Sludge handling fa:•litfes for rater ou-lrleetton
plants. sane. greet:. crushed stone and :user similar
opera:tom-•see oe.mi tlon No. 10)
:5) Molding Ponds or Melting Tanks for 0rgani: or Toxic
Materials.with no 0 054rge to the surface waters 4
(Any pus,. valve. a- ether mechanical cr:rol subject
to failure C'ea:its a potential for bypass or dt1Charge
from the bahus ands or tanks will car:essltaeg titled
minis clessifice.so* of Class 1 recut • r9
operator).
-3-
tNISCaooANw$ IJIV S UM .NuEO) . POINTS
:4) molding Pond for tfrxat Flow Equalizatta end/or V
Stage Discharge . . 3
4a Effluent Hass 2
StaP Vr Puma Paver (s adln9 air lift)
;f 3
Thermal toilettes Lwtrol Device 3
:toilettes Treatest Peocrosses Par Removal of Maul or Cyanide tad
other Testa masertes
:coal hint
0.W-42„-�IGT1011
Class 1 .. S • 2S Polmt
Class II 26 • SO ?Ines
Class 111 SI • iS hints
Class 1e iV - Up hints
Facilities saving a rating of one usurps four point. inclusive.
so not more a carte •' age operator. lafInv aa*3 .1 of eMr9e.
exeilitses requires a c mparable grade operator