NC0074012_Wasteload Allocation_19950118

NPDES DOCUHIENT SCANNING COVER SHEET
NC0074012
Lincoln County/Forney Crk WWTP
NPDES Permit:
Document Type:
Permit Issuance
/
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Complete File - Historical
Speculative
Limits
Instream Assessment (67b)
Environmental Assessment (EA)
Permit
History
Document Date:
January 18, 1995
Miss document i'a printed on reuiBe paper - ignore any
content on the re rerse'aide

Refer : Basinwide / Streamline WLA File
Completed By Permits & Engineering
At Front Of Subbasin
PERMIT NO.: NC0074012
PERMITTEE NAME: Lincoln County Utilities
NPDES WASTE LOAD ALLOCATION
FACILITY NAME: Middle Forney Creek Wastewater Treatment
Facility Status: Existing
Permit Status: Modification
Major Minor '\1
Pipe No.: 001
Design Capacity: 0.75 MGD
Domestic (% of Flow): 100 %
Industrial (% of Flow): 0
Comments:
WLA needed for 1.5 MGD also. Current permit has limits at 0.076 and
0.50 MGD.
RECEIVING STREAM: Forney Creek
Class: C
Sub -Basin: 03-08-33
Reference USGS Quad: F14NE
County: Lincoln
Regional Office: Mooresville Regional Office
(please attach)
Previous Exp. Date: 7/31/96 Treatment Plant Class: II
Classification changes within three miles:
None - Changes to WS-IV in Killian Creek - approx. 5 miles
downstream
Requested by:
Prepared by:
Reviewed bv(
Greg Nizich t� Date: 11/3/94
�I. Date: / L YS
Ja4,i(LLil %-) Date: i�c1.5
c, ,w C ��
Modeler
Date Rec.
#
_Th-k13
"1 3I ''1+
864%
Drainage Area (mil ) 7 g
7Q10 (cfs)
Avg. Strcamilow (cfs):
Winter 7Q10 (cfs) /, 30Q2 (cfs) /. 7
Toxicity Limits: IWC % Acute/Chronic
Instream Monitoring: Parameters �� /) (A ,- 47.3- �,/,
Upstream i / Locatio 5°1/4'' yt _ 1 sc y--
Location / o Mt %, o f -
Downstream i
Effluent
Characteristics
Summer
Winter
BOD5 (mg/1)
/y
Z,
NH3 N (mg/1)
Z ciir/
1( 6In/
D.O. (mg/1)
S
5
TSS (mg/1)
3 o
3o
F. Col. (/100 ml)
Zo d
Zo o
pH (SU)
6 -9
6 - 9
/ .e G
, s" �4 -/,e
.25-c,, 2
,,._4._ -46-e/h74.,,,-.9-
Comments:
:1

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 #
Lincoln Co -Middle Forney Creek WWTP
NC0074012
100% Domestic
Existing
Modification
Forney Creek
C
030833
Lincoln
Mooresville g--(z.
Nizich
11/3/94
F14NE
8046 DEFr.OF
3S�1I:S7:': M. ENT, HEALTH ,
9 NATURAL RESOURCES
9994
DIVISION OF ENVIRONMENTAL k1r AUMEE
MIOORESVILLE REGIONAL OFF CG
Stream Characteristic:
USGS #
Date:
Drainage Area (mi2): 7.8
Summer 7Q10 (cfs): 0.6
Winter 7Q10 (cfs): 1.4
Average Flow (cfs): 9
30Q2 (cfs): 1.7
IWC (%):
Wasteload Allocation Summary
(approach taken, correspondence with region, EPA, etc.)
Facility requesting modification of existing NPDES permit to expand to 0.750 MGD. Expansion of
facility is recommended at limits of 14/2/5 (summer) and 28/4/5 (winter) for protection of instream
DO standard. BOD5 limits are assigned so that winter limit (28) will not exceed 2X the summer
limit (14). Actual summer/winter NH3 toxicity limits are 1.4 and 3.7 mg/1, respectively, however
current Division procedure dictates that limits lower than 2 and 4 mg/1, will not be given. No
toxicity limit required because municipality is <1 MGD, not considered a major.
**MRO is asked to please review and return to TSB within two weeks **
Special Schedule Requirements and additional comments from Reviewers:
Recommended by:
Reviewed by
Instream Assessment: �/2.6, z QMC1.ekO
Regional Supervisor;dl
Permits & Engineering:
oAa'
RETURN TO TECHNICAL SUPPORT BY:
Date:11/21/94
Date: 11 ,93J Clq
Date: /7r'��r
Date:
DEC 0 6 1994

2
Existing Limits:
Wasteflow (MGD):
BOD5 (mg/1):
NH3N (mg/1):
DO (mg/1):
TSS (mg/1):
Fecal Co1. (/100 ml):
pH (SU):
Residual Chlorine (µg/1):
Temperature (°C):
TP (mg/1):
TN (mg/1):
Recommended Limits:
Wasteflow (MGD):
BOD5 (mg/1):
NH3N (mg/1):
DO (mg/1):
TSS (mg/1):
Fecal Co1. (/100 ml):
pH (SU):
Residual Chlorine (µg/1):
Temperature (°C):
TP (mg/1):
TN (mg/1):
0 1
30
jneeA'tor s
monitor
30
lino
6-9
monitor
monitor
monitor
monitor
CONVENTIONAL PARAMETERS
Monthly Average
SummWinter
0,07(0 N&i1
3o
21 ,
w1J,rlrrr
3o
Zoo
6-9
hv
morutry
eiwkritiv
Monthly Average
Summer Winter
0.750 0.750
14 28
2
5
30
200
6-9
25
monitor
monitor
monitor
4
5
30
200
6-9
25
monitor
monitor
monitor
11111foni
As of
WQ or EL
WQ
WQ,AT
i-z?-ry
Limits Changes Due To: Parameter(s) Affected
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 Fecal Coliform, NH3
New facility information
(explanation of any modifications to past modeling analysis including new flows, rates, field data,
interacting discharges)
(See page 4 for miscellaneous and special conditions, if applicable)

INSTREAM MONITORING REQUIREMENTS
Upstream Location: 50 ft. upstream of discharge
Downstream Location: 1.0 mi. below the discharge
Parameters: Temperature,DO, fecal coliform, conductivity
Special instream monitoring locations or monitoring frequencies:
MISCELLANEOUS INFORMATION & SPECIAL CONDITIONS
Adequacy of Existing Treatment
Has the facility dem9nstrated 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?
Special Instructions or Conditions
Wasteload sent to EPA? (Major) (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? (Y or N) If yes, explain with attachments.

I
Wr32002 09-35,09 TERMINAL CONNECTED TO IM% IM%
�KEX88/MP
i COMPLIANCE EVALUATION ANALYSIS REPORT
PERMIT--NC0074012 PIPE--00i
FACILITY--LINCO[N COUNTY UTILITIES
LOCATION--DENVER
MONTH
LIMIT
93/i1
93/12
94/0i
94/02
LIMIT
94/03
LIMIT
94/04
94/05
94/06
94/07
94/08
94/09
94/i0
F
F
F
1Z/82/94
PAGE .1
REPORT PERIOD: 9311-9410 LOC--- E
DESIGN FLOW-- .0760 CLASS--2
REGION/COUNTY--03 LINCOLN
50050 00310 00530 00610 0616 50060 00300 00OK.''
Q/MGD BOD REJ/T%% NH3+NH4- FEC COLI CHLORINE DO TEMP
.058{ F 30.00 F 30.0 NOL F i000.0 NOL NOL NOL
.02ii i.00 i8.5 .55 3.6 .473 8.41
.0211 4.50 i0.5 .06 66.5 .252 9.43 9.�5
.0220 6.50 i4.5 .05 5.2 .251 9.07 7.3-1
.0242 34.50F i5.0 7.95 180.0 1^i87 8.55 9.97
~�~
.0760 F 38.00 F 30.0 F 21.00 F 200.0 NOL NOL NOL
.827= 4.80 3.6 .45 9.3 i^i27 8.08 i3.W
.0760 F 30.00 F 30.0 F 5.00 F 200.0 NOL NOL NOL
.8267 2.25 7.2 .28 5.3 1.833 7.51 17.42
^026� ii.O0 15.0 13.20F 1.3 i"640 7.43 18.94
�
.0220 4.40 i4.6 3.61 6.9 7.46 23.25
.0226 5.00 8.2 2.52 .0 7.37 24.58
.0257 4.80 1O.8 i.27 39.0 6.16 2Ki5
.0268 5.50 W7 .44 ii7.0 7.12 21.66
.0278 4.75 0.0 1.29 20.4 468.57i 7.30
AVERAGE .8245 7.35 12.1 2.63 37.8 59.3i6 7.82 16.66
�
MAXIMUM .0562 63.00 40.0 i8.03 32400.0 1400.000 12.50 26.80
MINIMUM .0115 LE%%THAN 1.0 LE%%THAN LE%%THAN .010 3.30 2.60
UNIT MGD M6/L MG/L MG/L W00ML UG/L MG/L DEC^C

.4
-1
(WEX88/MP
PERMIT --NC
FACILITY--LIN[%R,
LOCAll: OMDENVER
MONTH
LIMIT
93/i2
94/0i
94/02
LIMIT
94/03
LIMIT
94/04
94/05
COMPLIANCE EVALUATI8N ANALY%IT REPORT'
i2/02/94
PAGE 2
80T48i2 PSPE.... .... 08i REPORT PERIOD: LOC-.... ....
E
N CO8NTY Ul1OITIE% DE%IGN FLOW-- .0760 CLA%%--2
REG%ON/COUNTY.... .... 03 LINCOLN
0040 00600 0W665
�>l TOTAL N PMO%-TOT
9.0 6.<9 NOL NOL
7.0.... 6.5
7^0.... 6.3
9^0 6.0
6.9~6.i
14.350 i.9808
NOL
NOL
9.0 6^0 NOL NOL
6.7-6.3 3.095 7.5750
/^uI'll u^
2.280 i<}.3600
94/06 7.1-6.3 10.038 7^2480
94/W7 7.4-6.8
94/.(48 6^9-6.0 .865 9.3100
94/09 6.9-6.i 3.995 5.0600
94/i0 6.8-5.81-
AVERAGEE 5.453 5.9875
MAXIMUM 7^700 33,.200 i4.4900
MINIMUM 5.85 4 2.280 WHO
UNIT %N MG/L MG/L

LINCOLN CO.-FORNEY CREEK WWTP
FORNEY CREEK
030833
JMN
10/17/94
Facility requesting speculative limits for 0.750 MGD wasteflow. Over the years have done
many WLAs for various flows. Lincoln Co. is planning for growth and has often included
wastewater for many service areas that may have been deleted as plans are reviewed. A
review of EA was done by Michelle Wilson earlier this year. At that time, IA commented
that spec limits for 0.750 MGD would have to be completed as part of the assessment
process.
Basinwide Management Plan has no specific strategy for this watershed. The plan for
regionalization of flow is always supported
11/18/94
WLA request for expansion to 0.750 MGD. Facility will remain 100% Domestic
Wastewater. Limits have already been established for speculative letter by Level B model
analysis. Verified that streamflow being used is accurate, per USGS low flow report and
regression equations.
Forney Creek, located in HA9
DA=7.8mi2
QA=9cfs
s7Q10 = 0.58 = 0.6 cfs
w7Q10 = 1.37 = 1.4 cfs
30Q2 = 1.7 cfs
Summer and Winter (S/W)NH3 tox limits have been calculated at 1.4 and 3.7, . New
Division procedure is that minimum S/W NH3 tox limit are 2 and 4 mg/1, respectively
Level B modeling analysis calculates summer BOD5 at 14 mg/l. Per SOP, winter BOD5
limit cannot be greater that 2x summer limit , therefore winter limit is 28 mg/l.
Recommended limits are:
Wasteflow (MGD)
BOD5 (mg/1)
NH3-N (mg/1)
Dissolved Oxygen
TSS (mg/1)
Fecal Coliform (#/100m1)
pH (SU)
Residual Chlorine (41)
Summer
0.750
14
2
5
30
200
6-9
25
Winter
0.750
28
4
5
30
200
6-9
25
IWC @ 0.750 = 66%
* No Chronic Toxicity Requirement because facility is <1 MGD (not a major municipality).
//9 y

IP
Fadiity: Lincoln Co -Forney Cr
NPDES#: NC0074012
Receiving Stream: Forney Creek
Comment(s):
gage number not available
Low Row Record Station Number:
Hydrologic Area Number:
Drainage Area Low Flow Record Station:
Qave Low Flow Record Station:
s7Q10 Low Flow Record Station:
w7Q10 Low Row Record Station:
3002 Low Flow Record Station:
Drainage Area New Site:
MAR New Site:
Qave per Report Equation:
s7Q10 per Report Equation:
w7Q10 per Report Equation:
3002 per Report Equation:
Drainage Area Ratio:
[ new DA / Da al gage ]
Weighted Ratio:
Over -ride Inappropriate Site (y ):
HA9
must be < 400 sq. miles
7.80 sq. miles
1.2 cfs/miles squared
9 cfs
0.58 cfs
1.37 cfs
1.74 cis
Continue
#DiV/0!
#DiV/0!
#DiV/0!
Drainage Area New Site:
MAR New Site:
Weighted Qave per Report Equation:
Weighted s7010 per Report Equation:
Weighted w7010 per Report Equation:
Weighted 3002 per Report Equation:
7.80 miles squared
1.2 cfs/miles squared
#DIV/0!
no Input from above
no input from above
no input from above