NC0050342_Wasteload Allocation_19900302

NPDES DOCIMENT SCANNING COVER SHEET
NC0050342
Muddy Creek WWTP
NPDES Permit:
Document Type:
Permit Issuance
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Complete File - Historical
Engineering Alternatives (EAA)
Correspondence
Owner Name Change
Instream Assessment (67b)
Speculative Limits
Environmental Assessment (EA)
Document Date:
March 2, 1990
'r hba document is printed on realise paper - iartore any
content oa the reYeree e�ide

NPDES WASTE LOAD ALLOCATION
PERMIT NO.: NC0050.314 2-
FACILITY NAME: C./ IL) Lanth)r) - .S0 len?
,-)h►1t
Facility Status:
Permit Status:
Major ✓
Pipe No.: dp 2
Minor
Design Capacity: NA
Domestic (% of Flow):
Industrial (% of Flow): .2,(,e
Comments: 002- 0 (Arc( ont y cturirt Flood cond. hon5_
ORG Oct/loot- C hoox Itt) C1i5c hct 5e mug / 002 [§
nc� dez,r311 °nit) G.11ow3 dixhak3c. e, o ku'i cIvocc.
RECEIVING STREAM: ((k ddk( Creek,
Class: C_,
Sub -Basin: - Q3c70
Reference USGS Quad: Di 7 N C- (please attach)
County: Fot: i`Ho
Regional Office: to.5 rap
Requested by:
Prepared by:
Reviewed by:
9°
Date:
Date: 3J j 190
Date: 3 7_ ' 0
Modeler
Date Rec.
#
C.L
17-As\se
.(19 76-L1
Drainage Area (mil ) /a(,¢ ,
5-
dale
Avg. Streamflow (cfs):
7Q10 (cfs) 5 7 Winter 7Q10 (cfs) 30Q2 (cfs)
Toxicity Limits: IWC % Acute/Chronic
Instream Monitoring:
Parameters
Upstream Location
Downstream Location
9
Effluent
Characteristics
y r,.'Nound
,BOD:5- (m I .Q)
3O
1\1H3 (m31 !)
N!_
<D (1- i )
NL
EE Col, roam (AtGaomt)
?OU
,
9'
Comments: ,q awn! FDrm ruler ks chan863 chhich rhrxjicl
he morfe; p.ri char e rra '. ci onki ocoAr
Loren Iou. af- (,,fix,S ckas e, oz7(C5oo lc&zl ect af- Hco (0`1/4(
on yad iG n ?, v e i' OetA `ad k1 n Coll e.. eixceecto 500U t F3 .
cCcommend eFaent mOn'f',mJ fb Cd,Cu, , Pb, zv), Cr.

Request No.:4997B Update
WASTELOAD ALLOCATION APPROVAL
Facility Name: City of Winston
NPDES No.: NC0050342
Type of Waste: 74% Domestic
Status: Existing
Receiving Stream: Muddy Creek
Classification: C
Subbasin: 030704
County: Forsyth
Regional Office: WSRO
Requestor: Harris - orig.
Date of Request:
Quad:
RECOMMENDED EFFLUENT
Wasteflow (mgd) :
BOD5 (mg/1) :
NH3N (mg/1) :
DO (mg/1) :
TSS (mg/1) :
Fecal Coliform (/100m1) :
pH (su) :
Toxicity Testing Req.:
Upstream (Y/N) : Y
Downstream (Y/N) : Y
NL
30
NL
NL
30
200
6-9
MONITORING
Location:
Location:
COMMENTS
FORM
Salem - Outfall 002
Drainage area:
Summer 7Q10:
Winter 7Q10:
Average flow:
30Q2:
LIMITS
186.5
55
74
177
95
NtLEIVLO
FEB 28 1990
PERMITS & FNGINEFRIIC
Approval form reflects changes which should be made to permit.
Recommend effluent monitoring for cadmium, chromium, copper, nickel,
lead, and zinc.
Discharge may only occur when flow at USGS gage 02116500 located at
HWY 64 on the Yadkin River near Yadkin College exceeds 5000 cfs.
Recommended by: 2UU. (:. S,)(,` 4C. Date:
Reviewed by
Tech Support Supervisor: - Date:
Regional Supervisor:
Permits & Engineering:
RETURN TO TECHNICAL SERVICES BY:
ah /90
2449,6
Date: 2-2G-ic
Date: 36(co
MAR 15 1990

DIVISION OF ENVIRONMENTAL MANAGEMENT
February 12, 1990
MEMORANDUM
TO: Winston-Salem WLA File
FROM: Ruth Swanek
SUBJECT: Modifications to NPDES permit for outfall 002
Lower Muddy Creek WWTP
NPDES No. NC0050342
Representatives of the City of Winston-Salem met with DEM on
January 10, 1990 to discuss their permit. They brought plans of
outfall 002 which indicated that the City cannot choose to dis-
charge through outfall 002. When the stream flows reach flood
conditions, the discharge automatically occurs through pipe 002.
At all other times, the discharge must occur through 001.
The City is not able to treat the waste to the levels given
for the original permit for pipe 002 (16 mg/1 BOD5, 4 mg/1 NH3-N in
summer, and 24 mg/1 BOD5, 10 mg/1 NH3-N in winter). The City
contended that it could only treat the waste to secondary levels
which are the limits given to outfall 001, and it could not meet a
wasteflow limit of 15 mgd during flood conditions. Therefore, the
QUAL2E model developed for the Archie Elledge WWTP was run to
determine what stream flow is needed to maintain instream dissolved
oxygen concentrations at high effluent flows. The Archie Elledge
WWTP was input at its existing limits, and an effluent flow of 44
mgd was assumed through outfall 002 since this discharge occurred
during Hurricane Hugo. It was determined that a stream flow of
approximately 300 cfs was needed at the discharge point to maintain
water quality. (Note: the dissolved oxygen concentration was not
allowed to fall below 5.5 mg/1 per 15 NCAC 2B.0206 which calls for
more stringent limits when a flow other than the 7Q10 is applied).
The nearest gage to the outfall is located on the Yadkin River
downstream of its confluence with Muddy Creek at Highway 64. The
flow at this point is regulated by a dam upstream, and the yields
are different from those on Muddy Creek. It was determined that a
flow slightly more than twice the drainage area at the gage should
correspond to a flow which should protect water quality in Muddy
Creek. Therefore, no discharge will be allowed through outfall 002
if the flow at USGS gage 02116500 is less than 5000 cfs.
Since metals loading could be high during flood conditions,
effluent monitoring for cadmium, chromium, copper, nickel, lead,
and zinc were included. The pretreatment headworks analysis did
not show sources of any other metals.