NC0031879_Wasteload Allocation_19950127

NPDES WASTE LOAD ALLOCATION
PERMIT NO.: NC0031879
PERMI1'1'hE NAME:
FACILITY NAME:
City of Marion
Corpening Creek WWTP
Facility Status: Existing
Permit Status: Renewal
Major V
Pipe No.: 001
Minor
Design Capacity: 3.0 MGD
Domestic (% of Flow):
Industrial (% of Flow):
50 %
50 %
Comments:
Issue Color limits as soon as color study is complete.
RECEIVING STREAM: Corpening Creek
Class: C
Sub -Basin: 03-08-30
Reference USGS Quad: E 11 NW
County: McDowell
Regional Office: Asheville Regional Office
(please attach)
Previous Exp. Date: 00/00/00 Treatment Plant Class: IV
Classification changes within three miles:
Requested by:
Prepared by:
Reviewed bv:
Jay Lucas
Date:
Date:
12/2/93
//24/75
yII,CU o0-"- / Date:/a(o /qS•
5
Modeler
Date Rec.
#
.fA4,✓
/,zh,A93
76 80
Drainage Area (mi2 ) / / b.2._5 Avg. Streamflow (cfs): )2-
7Q10 (cfs) 2...3 Winter 7Q10 (cfs) 30Q2 (cfs) b
Toxicity Limits: IWC 6 7 % y� Acu ciChr
Instream Monitoring: ' � /4' Na ✓ J
Parameters TAD. D.D., �'vn1,)-, f r(d, &Ds , fLy�r (s �ec�
Upstream i Location l4O f/- *p, rcu i#, ,r a 1
Downstream Y Location Q, Se /'i 9¢ (CI frrnc� �, cJ) d Coact)dUulnsh cLrr t�'hr Ul)F 1 h
Recommended Limits:
Wasteflow (MGD):
BOD5 (mg/1):
NH3N (mg/1):
DO (mg/1):
TSS (mg/I):
Fecal Col. (/100 ml):
pH (SU):
Summer
3.0
30
monitor
5
30
200
6-9
Winter
3.0
30
monitor
5
30
200
6-9
nun; i r: T. R. CP p;14-6r,ast_, rP , TN
Daily Max. WQ
Arsenic (ug ): LTMP
Color monitor
Copper (ug/1): Monitor
Zinc (ug/l): monitor
Silver (ug/1): monitor
Cadmium (ug/1): 3
Chromium (ug/1): 75
Nickel (ug/1): 132.0
Lead (ug/l): 37
Cyanide (ug/l): 7.5
Mercury (ug/1): 0.02
3/month -
monthly
monthly _
monthly
Comments: -in /GLt �'r , a 69 /,,
See etH Fed IOIC/ - ✓ Co 10Y
rn ,-toV

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 # 7680
City of Marion - Corpening Creek WWTP
NC0031879
50% Domestic and S0% Industrial
Existing
Renewal
Corpening Creek
C
Catawba 030830
McDowell
Asheville
Jay Lucas
12/2/93
E11NW
Stream Characteristic:
USGS #
Date:
Drainage Area (mi2):
Summer 7Q10 (cfs):
Winter 7Q10 (cfs):
Average Flow (cfs):
30Q2 (cfs):
IWC (%):
8.28
2.3
3.6
12
6
67
Wasteload Allocation Summary
(approach taken, correspondence with region, EPA, etc.)
Recommend existing limits for conventional parameters (except update fecal coliform limit)
and new limits for toxicants based on my toxicant analysis. Facility had 1 violation 8/91 of WET
test in the last 5 years. Facility has excessive levels of T.R. Chlorine in their effluent they should
be sent chlorine letter. NH3N allowable is lmg/1 (S) and 3 mg/1 (W) facility presently does not
have a limit and compliance data indicates low levels of ammonia in their effluent. Tom Poe, from
Pretreatment recommends Qrtly monitoring for Ag, Cu, and Zn.
Special Schedule Requirements and additional comments from Reviewers:
C
o/6Y /'%1L1/ lvLy
Recommended by: ��+:�/Z
Reviewed by
Instream Assessment: �� /Q/Y)G1t/1/471
Regional Supervisor:
Permits & Engineering:
RETURN TO TECHNICAL SUPPORT BY:
Date: )
Date: ///
/B/yam
Date:
JAN 1 9 1995

CONVENTIONAL PARAMETERS
Existing Limits:
Monthly Average
Summer Winter
Wasteflow (MGD): 3.0 3.0
BOD5 (mg/1): 30 30
NH3N (mg/1): monitor monitor
DO (mg/1): 5 5
TSS (mg/1): 30 30
Fecal Co1. (/100 ml): 1000 q 000
pH (SU): 6-9 6-9
Residual Chlorine (µg/1): monitor monitor
Temperature (C): monitor monitor
TP (mg/1): monitor monitor
TN (mg/1): monitor monitor
Recommended Limits:
Wasteflow (MGD):
BOD5 (mg/1):
NH3N (mg/1):
DO (mg/1):
TSS (mg/1):
Fecal Co1. (/100 ml):
pH (SU):
Residual Chlorine (14/1):
Oil and Grease (mg/1):
n
,o
e
TP (mg/1): monitor monitor
TN (mg/1): monitor monitor
** Faciltiy shouldAreceiveochlorine letter. The allowable is 25 ug/1 to protect against instreamoxcitiynan(
facility's yearly average for the last years has been 275 ug/1 with a maximum value = 7000 ug/1,.
y/ye,. Peery/ /
Summer Winter
3.0 3.0
30 30
monitor monitor
5 5
30 30
200 200
6-9 6-9
monitor** monitor**
monitor monitor
LIMIT TO CHANGES TO DUE:
(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)

3
Type of Toxicity Test:
Existing Limit:
Recommended Limit:
Monitoring Schedule:
Existing Limits
Cadmium (ug/1):
Chromium (ug/1):
Copper (ug/l):
Nickel (ug/l):
Lead (ug/1):
Zinc (ug/1):
Cyanide (ug/1):
Mercury (ug/1):
Silver (ug/l):
Recommended Limits
Arsenic (ug/):
Cadmium (ug/l):
Chromium (ug/1):
Copper (ug/1):
Nickel (ug/1):
Lead (ug/1):
Zinc (ug/l):
Cyanide (ug/l):
Mercury (ug/1):
Silver (ug/1):
Cc icy
TOXICS/METALS
Chronic Toxicity Qrtly
P/F @ 67%
P/F @ 67%
Feb, May, Aug, Nov
Daily Max.
monitor
68
monitor
75
35
monitor
7.5
monitor
monitor
Daily Max.
LIMP
3
75
Monitor
131.0
37
monitor
7.5
0.02
monitor
Moth Ny
WQ or EL
WQ
WQ
VNOwi'
WQ
1011/9 WQ
b*WA6
WQ
X_ 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.
OR
No parameters are water quality limited, but this discharge may affect future allocations.

4
INSTREAM MONITORING REQUIREMENTS
Upstream Location: I00(f-o.6oVe 01-
4
Downstream Location: @ S P 1794 (0in cGr ( e ld koa d cIc u ',/-) ii,nq o / o-✓/
Parameters: Temp, DO, Cond, pH, Fecal Coli, BOD5 ,CA(or ( L afttick4
Special instream monitoring locations or monitoring frequencies:
MISCELLANEOUS INFORMATION & SPECIAL CONDITIONS
Adequacy of Existing Treatment
Has the facility demonstrated 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_ (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.

Facility Name flia - (),,,()ffl
Cvee kiltif TPPermit # NC,0037 9 Pipe # QD CHRONIC TOXICITY PASS/FAIL PERMIT LIMIT (QRTRLY)
The effluent discharge shall at no time exhibit chronic toxicity 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 (pi % (defined as treatment two in the North Carolina procedure document). The permit holder shall perform
quarterjy monitoring using this procedure to establish compliance with the permit condition. The first test will be
perf rmed r thirty days from the effective date of this permit during the months of
h,(, e / 191/1/ /Vo ✓ . Effluent sampling for this testing shall be performed at the NPDES
permitted final effluent discharge below all treatment processes.
All toxicity testing results required as part of 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 code TGP3B.
Additionally, DEM Form AT-1 (original) is to be sent to the following address:
Attention: Environmental Sciences Branch
North Carolina Division of
Environmental Management
4401 Reedy Creek Road
Raleigh, N.C. 27607
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 quarterly in the months specified above.
Should any test data from this monitoring 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 a. 3 cfs
Permitted Flow 3.0 MGD Recommended by:
IWC Co 7 %
Basin & Sub -basin ealriwb a 0 430
Receiving Stream a p,ii,iyg(reek
County %y1 C Do W, /l
Date 07/,i
/rya -
QCL P/F Version 9/91

COLOR REOPENER AND MONITORING REQUIREMENTS
This permit will be revoked and reissued to incorporate color limitations and/or revised
monitoring requirements in the event color testing or other studies conducted by the
permittee or the Division indicate that color has rendered or could render the receiving
waters injurious to public health, secondary recreation, aquatic life and wildlife or
adversely affect the palatability of fish, aesthetic quality or impair the water for any
designated use.
Color monitoring should consist of ADMI monitoring as specified below. All samples
taken should have complete descriptive recordings of the color in the sample container
including hue (distinctive characteristics and tint), clarity (clearness of the color sample)
and luminance (brightness or glowing quality) of the sample as it looks in the collection
container. Descriptions of stream color should also be recorded when color samples are
collected.
Color samples should be analyzed as follows:
a) at natural pH
b) free from turbidity (True Color); and
c) Samples shall be analyzed in accordance with the provisions of Method 2120 E.4. as
described in the 18th Edition of Standard Methods for the Examination of Water and
Wastewater. Using a narrow -band scanning spectrophotometer to produce a COMPLETE
spectral curve of the visible spectrum (350-75- nm), calculate and report results in ADMI
values for true color values at the sample's ambient pH value. All color data including
visual observations should be submitted with the monthly DMRs.
Color Monitoring Location and Frequencies:
Color Monitoring shall take place instream above the effluent outfall, downstream below
the effluent outfall and in the effluent.
Frequency shall be 3 consecutive days (preferably Tuesday, Wednesday and Thursday)
once per month.

Chapter 6 - Goals, Concerns and Management Strategies
General Recommended Strategies for Expanding and Proposed Dischargers in the
Catawba Basin
The transitional environment between free flowing streams and lakes is a potentially
sensitive area to loading of oxygen demanding wastes. As stream waters slow and deepen as they
enter a lake, the rate at which oxygen enters the water is reduced. This means that a
concentration of oxygen demanding waste that was acceptable in a free flowing stream may result
in dissolved oxygen levels below the State standard.
The seven major reservoirs that make up the chain of lakes along the Catawba River
create many transition zones between streams and lakes. The hundreds of tributaries to the seven
major reservoirs create local environments where waters may be relatively sensitive to oxygen
demanding wastes. Due to the transitional nature of such waters, the exact allowable amount of
oxygen demanding wastes that can be discharged without impairing water quality is difficult to
determine. Water quality studies can be conducted on a case -by -case basis to support wasteload
allocations. However, due to the widespread occurrence of transitional waters in the Catawba
Basin and the high demand on water for the assimilation of oxygen consuming wastes, a
basinwide strategy is recommended. Over the past five years, DEM has implemented a minimum
treatment strategy for discharges of oxygen demanding waste in the Lake Norman watershed. It
is recommended that this strategy, described below, be extended to all seven major lakes in the
Catawba Basin.
All new and expanding dischargers of oxygen consuming wastes that discharge to the
Catawba River Chain of Lakes or are predicted to increase oxygen demanding waste loading to
the lakes, will be required to meet a minimum of advanced secondary treatment limits. Typical
NPDES permit conditions for advanced secondary treatment facilities are in the range of 10 to 15
mg/l BOD5 and 2 to 4 mg/1 NH3-N. These limits will help to protect water quality standards in
the Catawba River chain of lakes and will allow for continued growth in the region.
6.3.1 Catawba River Mainstem Watersheds (Subbasins 03-08-30 to 03-08-33)
Subbasin 03-08-30 (Catawba River Headwaters, Lake James)
Corpening Creek
Corpening Creek has been listed as an impaired stream due to non -point source
pollution from agricultural and urban runoff from the City of Marion. In addition, Corpening
Creek receives treated wastewater from the 3.0 MGD Marion WWTP via Youngs Fork Creek.
Benthic macro invertebrate studies conducted above and below the Marion WWTP indicate only
fair water quality above the discharge and fair (1985) or poor (1990) water quality below the
discharge. This suggests that the Marion WWTP was affecting the invertebrate community but
that upstream non -point pollution sources play a significant role in the stream impairment.
Over the past three years, the Marion WWTP has averaged less than 5 mg/I BOD5 and
less that 1 mg/1 NH3-N. These concentrations of oxygen consuming wastes are well below the
facilities secondary treatment based limits. Therefore it is recommended that efforts to address
water quality issues in the Corpening Creek watershed be concentrated upon non -point source
pollution reduction.
6-7

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Facility Name:
Permit Number:
Engineer:
Subbasin:
Receiving
Stream:
USGS quad #:
Request Number:
Date:
Expiration date:
City of Marion - Corpening Creek WWTP
NC0031879
Lucas
03-08-30
Corpening Creek
E 11 NW
7680
12/6/93
00 / 00 / 00
Existing WLA
checked:
Staff Report:
Topo checked:
USGS Flows
confirmed:
PIRF / APAMS:
x
x
X
r
IWC Spreadsheet: x ammonia limits required
Stream Classification: x
Nutrient Sensitivity:
Instream Data:
x attached
Brief of WLA
Analysis
1976: 3.0 mgd w/ a 0.98 mgd 7Q10 - limits of 11.0 BOD5 2 NH3-N, 5 dissolved oxygen, 30 TSS,
200 fecal
1979: same limits, but given in both concentration and mass - also, a phosphorus limit was given with
a statement declaring that it was an EPA limit and no that of the State of North Carolina.
Notes in file indicate that EPA ran a model on this facility in 1973 and that is how the various
limits were arrived at.
1983: discharge was remodeled with significant changes to the model... The depth was substantially
increased, the velocity was then cut in half. The deeper, slower moving modeled stream
decreased the CBOD constant [ki] from 2.6 to 0.57 and increased the NBOD constant [k2]
from 9.25 to 19.62. Trevor Clements did this model and very few notes exist as to these changes.
The new limits were 30 / 30 with 1,000 fecal.
1984: Draft report of phosphorus analysis on Lake Rhodhiss; report indicates that phosphorus levels
were relatively high, but phytoplankton production was low.
1986: final report on modeling analysis for change in limits from 11 / 2 to secondary treatment. WLA
reissued with secondary limits for waste flow expansions to 4.0, 5.0, and 6.0 mgd.
1988: WLA reissued with existing limits. New requirements for Chromium, Nickel, Lead, and Cyanide
as well as monitoring requirements for Cadmium, Copper, Zinc, Silver, and Mercury.
1989: letter to EPA from Steve Tedder regarding ammonia toxicity for this, (and other) Permits.
Letter indicates that a limit is not required, due to low levels in effluent, (dates of data are not
given) coupled with the consistent passing of their toxicity testing.
1990: Memo reiterating that an ammonia limit is not necessary.
Basin Strategy
DMR's and Central Files Information
DMR's input into Toxic Spreadsheet, (attached), as well as Instream Monitoring information,
(attached)

coliform measurements as well as instream BOD's have a strong positive correlation. The
instances of high fecal coliforms are present both up and downstream, during which time the
biochemical oxygen demand is high.
Other information present in Central Files is an abundance of letters from Pretreatment about
implementation of their Pretreatment Program.
Chlorine levels are high and current fecal coliform limit is 1,000 / 100 ml, (a limit of 200 should be
easily achievable).
Pretreatment
HAVE NOT CONTACTED PRETREATMENT: DANA FOLLEY
SIU's Effleunt Considerations
Marion Manufacturing (Cross Mills) Textiles
Marion Manufacturing (700 Baldwin Avenue) Textiles
Wiliwear Hosiery Textiles
Linville Hosiery Textiles
Staff Report
No other info to add. Requests Color limit when study is finalized.
LTMP
Arsenic: Max. Pred no monitoring required per NPDES - check with
Cw Pretreatment
Allowable due to high levels of other metals, some type of
Cw requirement may be justified
Cadmiu Max. Pred 24.5
m: Cw
Allowable 2.99
Cw
Chromiu Max. Pred 86.4
m: Cw
Allowable 74.7
Cw
Copper: Max. Pred 1218 NPDES monitoring requirement for excessive Action
Cw .8 Level
Allowable 10.5 constituents; per current SOP
Cw
Cyanide: Max. Pred 8.4
Cw
Allowable 7.5
Cw
Lead: Max. Pred 235.
Cw 6
Allowable 37.4
Cw
Mercury: Max. Pred 9.6
Cw
many high values
many high values
'X

Cw
Nickel: Max. Pred 140.
Cw 4
Allowable 131.
Cw 5
Silver: Max. Pred 87.5 NPDES monitoring requirement for excessive Action
Cw Level
Allowable 0.1 constituents; per current SOP
Cw
Zinc: Max. Pred 1098 NPDES monitoring requirement for excessive Action
Cw .3 Level
Allowable 74.7 constituents; per current SOP
Cw

Marion - Corpening Creek WWTP
corpening creek NC0031879
Residual Chlorine
7010 (CFS)
DESIGN FLOW (MGD)
DESIGN FLOW (CFS)
STREAM STD (UG/L)
UPS BACKGROUND LEVEL (UG/L)
IWC (%)
Allowable Concentration (ug/l)
Fecal Limit
Ratio of 0.5 :1
Ammonia as NH3
(summer)
2.3 7010 (CFS)
3 DESIGN FLOW (MGD)
4.65 DESIGN FLOW (CFS)
17.0 STREAM STD (MG/L)
0 UPS BACKGROUND LEVEL (MG/L)
66.9 % IWC (%)
25 Allowable Concentration (mg/l)
Ammonia as NH3
(winter)
7010 (CFS)
200/100m1 DESIGN FLOW (MGD)
DESIGN FLOW (CFS)
STREAM STD (MG/L)
UPS BACKGROUND LEVEL (MG/L)
IWC (%)
Allowable Concentration (mg/l)
2.3
3
4.65
1.0
0.22
66.9 %
1
3.6
3
4.65
1.8
0.22
56.4 %
3

r! tin -7 re ,.i ,h h/ /TP
Upstream: 0.5 miles above plats @ bridge
Date DO Temp Saturation BOD Fecal Conductivity
Mar-94 10.3 9 89% 0.6 280 76
Feb-94 11 7 90% 1.3 339 81
Jan-94 12.5 4 95% 1.1 212 82
Deo-93 12.4 5 97% 0.5 91 82
Nov-93 11 7 90% 0.6 107 82
Oct-93 8.9 13 85% 0.6 211 75
Sep-93 7.9 19 85% 0.6 386 83
Aug-93 7.2 21 81% 0.5 385 85
Ju1-93 7.5 21 84% 0.4 441 79.4
Jun-93 8.2 18 87% 0.5 478 77.5
May-93 9 17 93% 0.5 235 74.2
Apr-93 10.1 11 92% 1.3 245 70.7
Mar-93 11.2 8 94% 0.3 117 70.5
Feb-93 11.3 5 88% 0.4 145 73.6
Jan-93 10.7 7 88% 0.4 135 72.5
Deo-92 10.7 6 86% 0.3 156
Nov-92 9.7 9 84% 0.5 234
Oct 92 9 13 85% 0.9 344
Sep-92 7.6 18 80% 0.8 1,000
Aug-92 7.4 19 80% 0.9 711
JuI-92 7.8 20 86% 0.8 1,084
Jun-92 9.1 15 90% 0.7 853
May-92 9.7 13 92% 0.8 743
Apr-92 10.3 10 91% 0.7 449
Mar-92 11.7 8 98% 0.4 242
Feb-92 12 5 94% 0.9 89
Jan-92 11.6 4 88% 0.9 131
Deo-91 12.3 5 96% 0.6 258
Nov-91 10.5 8 88% 0.6 180
Oct-91 9.5 12 88% 0.5 183
Sep-91 7.6 18 80% 0.5 391
Aug-91 7.6 19 82% 0.6 732
Jul-91 7.3 20 80% 0.7 756
Jun-91 7.6 18 80% 0.5 723
May-91 8.5 16 86% 0.5 1,075
Apr-91 9.6 12 89% 0.85 420
Mar-91 12.5 8 105% 0.7 484
Feb-91 12 7 98% 1.2 421
Jan-91 11.8 7 97% 0.7 213
Downstream: 0.5 miles below plant @ bridge
DO Temp Saturation BOD Fecal Conductivity
10.4 9 90% 1 637 132
10.9 8 92% 1.8 301 148
12.2 5 95% 2.3 251 158
12.1 6 97% 0.5 18 170
11.2 9 97% 1 106 196
9.3 13 88% 0.65 187 171
8.2 19 88% 0.6 405 175
7.7 20 85% 0.8 258 172
7.6 21 85% 0.5 374 157.5
8.4 18 89% 0.5 441 139.8
9.2 15 91% 0.6 228 114.7
10.1 11 92% 1.7 295 107.3
11.4 8 96% 0.8 160 110.1
11.5 5 90% 0.4 156 126.1
10.9 7 89% 1.2 165 121.6
10.9 6 87% 197
10.1 9 87% 1.3 339
9.2 13 87% 0.9 342
7.7 17 80% 0.8 1,064
7.4 19 80% 0.9 813
7.5 20 83% 1.2 1,087
9.1 15 90% 0.9 973
9.8 13 93% 0.9 680
10.2 10 90% 0.6 649
11.9 8 100% 0.3 114
12.2 5 95% 1.2 129
11.9 4 91% 0.8 80
12.4 5 97% 0.9 200
10.6 9 91% 1.1 159
9.5 13 90% 0.5 137
8 18 85% 0.5 273
7.8 20 86% 0.6 649
7.7 21 86% 0.7 682
7.9 18 84% 0.6 739
8.5 17 88% 0.7 1,008
9.6 12 89% 0.65 407
12.2 8 103% 4.4 453
11.7 7 96% 1.4 487
11.5 8 97% 0.6 243
9/27/94

January, 1992 through March, 1994
FacilhyName = Marion - Corpening Creek WWTP
NPDES #= NC0031879
Ow (MGD) = 3.00 mgd
7Q10e (cfs) 2.30 cfs
nvc f96J = 66.91 %
FINAL RESULTS
Cyanide Maximum Value 7.0
Max. Pred Cw 8.4
Allowable Cw 7.5
Chromium Maximum Value 48.0
Max. Pred Cw 86.4 _
Allowable Cw 74.7
Nickel Maximum Value 78.0
Max. Pred Cw 140.4
Allowable Cw 131.5
Lead Maximum Value 124.0
Max. Pred Cw 235.6 }
Allowable Cw 37.4
Silver [AL] Maximum Value 25.0
Max. Pred Cw 87.5
Allowable Cw 0.1
Cadmium Maximum Value 7.0 -
Max. Pred Cw 24.50
Allowable Cw 2.99
Copper [AL] Maximum Value 277.0
Max. Pred Cw 1218.8 r
Allowable Cw 10.5
Mercury Maximum Value 3.0
Max. Pred Cw 9.60
Allowable Cw 0.02
Zinc [AL] Maximum Value 523.0
Max. Pred Cw 1098.3
Allowable Cw 74.7
5/19/94

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70 2.5
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its
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a BDl tt60L 1t 1120L 125l2LU lre6U2.15
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ns

.Wutry.1032 nnaph WM,. 1854
Pwseo9o- L.69d Powwow - 6115I (AL)
7t1w..1_ 25 pl 1 1antlod_ 0.06 9.1
▪ BCL.12114 11 12 (2. RESULTS
1 57 Bed Dor. 15.6
t 67 mow, 11.1
7 32 C.Y. 1.7
4 109
5 36
e 43 MRF.cb.. 1.9
7 26 Mx. Value 1140 so
9 38 mf. Ptod Co 2168 pt
9 29 NI00.Ob CV A.4 p4
5 29
29
x 25
21
14
15
17
le
19
20
T
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a
24
a 1
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m
11
a
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77
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40 13
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q 1.5
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45 1.5
4 124
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4 lb
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52 13
54 13
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57 5
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72 23
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74 2.5
75 2.5
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77 16
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lm 6
155 8
117 15
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111 7
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b
• BCL.120L 11112 DI RESULTS
t 23 9tl Cot. 9.0
2 5.6 m.w, 7.7
1 42 C.V. 1.2
4 2.5
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1 23 • YOOFacb. 15
7 23 • 115.15ed3. 16.0
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to 0.5
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5
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11
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t 7 11ov, 1.44o.n
3 42 C.Y. 1.2C.Y.
4 23
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0 42 Y..1 31.3
3 19 QV. 1.6
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7 16 Yes. V31w 177.• pa
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SAW

TOXICANT ANALYSIS
Parameter =
Arsenic
1
Standard =
50jig/1
n
BDL=1/2DL
Actual Data
RESULTS
,
1
1.5
<3
Std Dev.
2.550536825
2
1.5
<3
Mean
4.166666667
3
1.5
<3
C.V.
0.612128838
4
3.5
<7
5
3.5
<7
6
3.5
<7
Mult Factor =
2.61
7
3.5
<7
Max. Value
,
9.3
mil
8
3.5
<7
Max. Pred Cw
24.18
µg/l
9
3.5
<7
Allowable Cw
74.7
µg/l
10
8.6
8.6
11
9.3
9.3
12
8.6
8.6
13
3.3
3.3
14
3.5
3.5
15
3.7
3.7
16
17
18
papa k Preherrs"-
9/27/94 PAGE '

111 iJv,r CAN YU 1 W Name =>' ./// ,,
Data Summary Sheet NPDES # _>
PAGE 1 WWTP Sampling Location
or Industry Name =>
if Industry, IUP Number =>
if Industry, Pipe Number =>
/ye ob 3/82q
/-,that �
Sample
5
Please attach schematic, site plan, or map
to show exactly where sample was collected.
scbodulad. Unschoduk4
balust+al. Demand
Composhc. Flow compost,
Omb
Laboratory Performing each analysis =>
R • . - . Method Detection Limit for • arameters =>
1.00 mg/1
1.00 mg/I
TSS
m:
.010 mg/1
Al
Mondavi
m:
.500 mg/1
NH3
Ammonia
m:
.010 mg/1
AS
Arsenic
m •
.002 mg/1
Cd
Cadmium
m
.005 mg/1
Cr
Chrvautaan
.002 mg/1
Cu
Copper
DATE
Sample
Collected
Time
Sample
Collected
Person
Collecting
Sam .Ie
Q
now
m:d
Q
now
:al/da
BOD
m:
` `
' .r
' ' %V.'0gi
"1i0
0.
L0.003
zOrW
40, oo -
O.'
-- --93
S: 00 -.,4.
l-
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INEMIIIMINI.IIIMIIMME
MEI
iL.
......
vismnoica
n4x
WM
21
21
bra f
22
X
23
u
�..
Number of data measurements
Maximum data values
Average data values
Resulting loading values in
Values less than MDL should be entered
=>
m
(mg/I) =>
(lbs/day) =>
with fh,.. fr,nr,...:—_
_
-- —•— •...�......,b a.lnaucm G V.wL mcu
Please circle any questionable or atypical values that should not be included in the average
and give any explaination for why they should be excluded.
IDMR Summary Sheet
Page 1 ANYJDMRJXLS

.)MR
..4 Summary Sheet
rAGE 2
POTW Name =>
NPDES # =>
WWTP Sampling Location
or Industry Name =>
Cily 464.,,„
/vcG�3an
(on9€,4.4-9
This is page 2, Sample location,
at
Laboratory performing araysi>
Required MDL Limit =>
.010 mg/1
.010 mg/1
Pb
Lad
mg/I
.000 mg/1
Hg
Mercury
mg/1
.010 mg/1
Ni
Nickel
mg/I
.005 mg/1
Ag
Silver
mg/1
.010 mg/1
Zn
Zinc
mg/I
Other
P�Os°� s
Other
Other
Other
Other
Date
Sample
Collected
Time
Sample
Collected
CN
cyanide
mg/1
I
I- 4-e'-93
S: Or9A.34,
0-007
L a 00.3
/O, a01
4 0, 010
zhis '/40
0
0- Q:
2
-gq-93
K 004.4/.
, 40.003`
0,00*
1-0(00/
G0,010
ZO,0/0
0,A35-
/, Qs'
3
1- 30- q3
i0,9..14.
L 0. 00
4.A0'3
Lo-LO1
-O.Olo
,4j�, 0/0
O J '9
/.'07
4
S -1 7,13
S : oaA. /14,
I. a.OQ r
LGWo
crux
A Da"
_
' •D/O
,i, off-
/, c 9
s
*--18 = 93
s'- oa ,49. �,
z. ',0(,5-
L4,0/0
Of a,
tL, O(!f
4. O.0/0
0, Oga
/,19
6
'-1q —? 3
8, 00 A- 44_
'
1-L, ;
'
LG /O
A4L
D- Ds
G oo,5-
LG10fo
O OIS
LDS
7
/0 --)-6— q3
8: e n4. ,-yi.
-g. 019—
L %)/D
/0,opoa
60,005-
L 0.005-
,),10D
0.G2-D
a
10-27 -93
4(MA,/71-
,.!',0,r
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44 -oo4
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9
/ 0-1--91
m04, rr, •
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4, OGea
4.0025
a Z7 ;-
o • 6M
01612
10
a-- /zi -9
S: 00,4. /71.
D.O2/
0. 03,5-
LO.00o)S
0, 0/i4
0.0,^Ar
0,038
(.�, 3$'
_
11
--45-9
'0O,� /''I.
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0,0239
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0,3
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0-0D9
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a.037
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0. 0/
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() . 9.3
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1s
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ram.- oc'..�. �.
�
�1 oJ5-
ant?
ant?
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4.Q/
z aceoa- '
(1. 03
/.-3/d '
16
17
18
19
20`1
g :
it
DM
21
r i4x
M4.,
23
24
'
Number of data
Maximum data
Average data
Resulting loading
measurements =>
.
values (mg/I) =>
values (mg/1) =>
in (lbsfday) =>,
•
Please circle any questionable or atypical values that should not be included in the average
and give any explaination for why they are deviant Valuer.
IDMR Summary Sheet
Page 2 ANYJDMR.XLS

SOC PRIORITY PROJECT: Yes No X
IF YES, SOC NUMBER
TO: PERMITS AND ENGINEERING UNIT{` ' ? q.
WATER QUALITY SECTION �''
ATTENTION: Jay Lucas
DATE: November 23, 1993
NPDES STAFF REPORT AND RECOMMENDATION
COUNTY McDowell
PERMIT NUMBER NC0031879
PART I - GENERAL INFORMATION
1. Facility and Address: City of Marion, Corpening Creek Plant
Post Office Drawer 700
Marion, N. C. 28752
2. Date of Investigation: July 22, 1993
3. Report Prepared By: James R. Reid
4. Persons Contacted and Telephone Number: Bill Hunnicutt
704-652-5747
5. Directions to Site: Facility is located on Highway 226
approximately 0.5 mile south of the intersection of 1-40 and
Highway 226 near Marion, in McDowell County.
6. Discharge Point(s), List for all discharge points:
Latitude: 35° 39' 04" Longitude: 81° 57' 29"
Attach a USGS map extract and indicate treatment facility site and
discharge point on map.
U.S.G.S. Quad No. E11NW U.S.G.S. Quad Name Marion East
7. Site size and expansion area consistent with application?
X Yes No If No, explain:
8. Topography (relationship to flood plain included): Terrace
adjacent to flood plain.
Page 1

9. Location of nearest dwelling: Greater than 500 feet.
10. Receiving stream or affected surface waters: Corpening Creek (aka
Youngs Fork Creek).
a. Classification: C
b. River Basin and Subbasin No.: CTB 030830
c. Describe receiving stream features and pertinent downstream
uses: Wildlife Support, Agricultural Support., Mountain -type
stream with rocky -sandy substrate.
PART II - DESCRIPTION OF DISCHARGE AND TREATMENT WORKS
1. a. Volume of wastewater to be permitted 3.0 MGD (Ultimate
Design Capacity)
b. What is the current permitted capacity of the Wastewater
Treatment facility? 3.0 MGD
c. Actual treatment capacity of the current facility (current
design capacity 3.0 MGD
d. Date(s) and construction activities allowed by previous
Authorizations to Construct issued in the previous two years:
None
e. Please provide a description of existing or substantially
constructed wastewater treatment facilities: Influent pump
station, bar screen, grit removal, primary clarifiers,
aeration basin, lime addition, tertiary filters, gravity
sludge thickners, vacuum sludge filters, step aeration,
chlorination.
f. Please provide a description of proposed wastewater treatment
facilities:
g•
Possible toxic impacts to surface waters:
h. Pretreatment Program (POTWs only):
in development
should be required
approved X
not needed
2. Residuals handling and utilization/disposal scheme: Vacuum
filtration, dedicated landfill.
a. If residuals are being land applied, please specify DEM
Permit Number Sludge Landfill Permit No. WQ0003698
Residuals Contractor City of Marion conducts the operation.
Telephone Number
b. Residuals stabilization: PSRP PFRP OTHER
Page 2

c. Landfill: X
d. Other disposal/utilization scheme (Specify):
3. Treatment plant classification (attach completed rating sheet): IV
4. SIC Codes(s): 4952
Wastewater Code(s) of actual wastewater, not particular facilities
i.e., non -contact cooling water discharge from a metal plating
company would be 14, not 56.
Primary 01 Secondary 55
Main Treatment Unit Code: 01101
PART III - OTHER PERTINENT INFORMATION
1. Is this facility being constructed with Construction Grant Funds
or are any public monies involved. (municipals only)? Renewal
only
2. Special monitoring or limitations (including toxicity) requests:
Color (at such time as details of DEM's color study are finalized)
3. Important SOC, JOC, or Compliance Schedule dates: (Please
indicate) N/A
Submission of Plans and Specifications
Begin Construction
Complete Construction
Date
4. Alternative Analysis Evaluation: Has the facility evaluated all
of the non -discharge options available. Please provide regional
perspective for each option evaluated.
Spray Irrigation: N/A
Connection to Regional Sewer System: N/A
Subsurface: N/A
Other disposal options: N/A
5. Other Special Items:
Page 3

PART IV - EVALUATION AND RECONNENDATIONS
Renewal of the NPDES Permit for the Corpening Creek Plant is
recommended.
re of Report Preparer
1.40 Akifff,5
1
Water Quality Regional Supervisor
,X)c)-2A%1-14- /Lac/ (?3- /9
Date
Page 4

Name of Facility:
Owner or Contact Person: ' d
Mailing Address:
County: Al \ IJa uv ALL
Present Classification:
RATING SCALE FOR CLASSIFICATION OF WATER POLLUTION CONTROL SYSTEMS
l�4 N (em,
w� L1G �4�-c-"-
o /lAa c�ti & I R.. !-fv,� n 1 ��: ee._
pc, aDQ'zic ciz goo' Ma l o rJ s'JG 4r7.1
a Z
Telephone: Cp S- ?SI3
New Facility Existing Facility _/
Per. No.WQ Health Dept.Per No.
-6Z4g Date:
NPDES Per. No. NC00.3/ 8- % 9
Rated by: .3-TAN T
Nondisc.
!� Telephone:
Reviewed by: Health Dept.
, l-0E442 Regional Office
Central Office
ORC: Grade:
Check Classification(s): Subsurface Spray Irrigati
Wastewater Classification: (Circle One) 1 it 111
Telephone:
Telephone: ?a/0..S/ 20�/
Telephone:
Telephone:
Land Application
Total Points:
IN -PLANT PROCESSES AND RELATED CONTROL EOUIPMENT WHiCH ARE AN INTE RAL PART OF INDUSTRIAL PRODUCTION SHALL NOT BE
CONSIDERED WASTE TREATMENT FOR THE PURPOSE OF CLASSIFICATION. ALSO SEPTIC TANK SYSTEMS CONSISTING ONLY OF SEPTIC TAM(
AND GRAVITY NITRIFICATION LINES ARE EXEMPT FROM CLASSIFICATION
SUBSURFACE CLASSIFICATION
(check all units that apply)
1. septic tanks
2. pump tanks
3. siphon or pump -dosing systems
4 sand filters
5. grease trap/interceptor
6. oil/water separators
7. gravity subsurface treatment and disposal:
8. pressure subsurface treatment and disposal:
SPRAY IRRIGATION CLASSIFICATION
(check all units that apply)
1. preliminary treatment (definition no. 32 )
2. lagoons
3. septic tanks
4pump tanks
5. pumps
6. sand filters
7. grease traplinterceptor
8. oil/water separators
9. disinfection
10. chemical addition for nutrient/algae control
11. spray irrigation of wastewater
In addition to the above classifications, pretreatment of wastewater in excess of these components shall
be rated using the point rating system and will require an operator with an appropriate dual certification.
LAND APPLICATION/RESIDUALS CLASSIFICATION (Applies only to permit holder)
1. Land application of biosolids, residuals or contaminated soils on a designated site.
WASTEWATER TREATMENT FACILITY CLASSIFICATION
The following systems shall be assigned a Class I classification. =Lem the flow is of a significant quantity or the technology is unusually
complex, to require consideration by the Commission on a case -by -case basis: (Check if Appropriate)
1. OiVwater Separator Systems consisting only of physical separation, pumps and disposal;
2. Septic Tank/Sand Fitter Systems consisting only of septic tanks, dosing apparatus, pumps,sand filters, disinfection
and direct discharge;
3. Lagoon Systems consisting only of preliminary treatment, lagoons, pumps, disinfection, necessary chemical treatment for
algae or nutrient control, and direct discharge;
4. Closed -loop Recyde Systems;
5. Groundwater Remediation Systems consisting only of oiVwater separators, pumps, air -stripping, carbon adsorption, disinfection
and disposal;
6. Aquaculture operations with discharge to surface waters;
7. Water Plant sludge handling and back -wash water treatment;
8. Seafood processing consisting of screening and disposal.
9. Single-family discharging systems, with the exception of Aerobic Treatment Units, will be classified if permitted after July 1,
1993 or if upon inspection by the Division, it is found that the system is not being adequately operated or maintained. Such
systems will be notified of the classification or redassiiication by the Commission, in writing.

The following scale is used for rating wastewater treatment facilities: (circle appropriate points)
(2)
ITEM
POINTS
Industrial Pretreatment Units or Industrial Pretreatment Program (see definition No. 33) . 4
DESIGN FLOW OF PLANT IN gpd (not applicable to non -contaminated cooing waters. sludge handling facilities for
water purification plants. totally closed cycle systems(see definition No. 11). and facilities consisting only of item
(4)(d) or Items (4)(d) and (11)(d)]
0 - 20.000 ... 1
20.001 - 50.000 2
50.001 - 100.000
100.001 - 250.000
250.001 - 500.000
500,001 - 1,000,000
3
4
5
.8
1.000.001 - 2.000.000 10
2.000.001 (and up) rat: 1 point additional for each 200.000 gpd capacity up to a maximum of 30
Design Flow (gpd) i ' L D U
(3) PREUMINARY UNITS/PROCESSES ( deft . No.32)
(a) Bar Screens 1
or N
(b) Mechanical Screens. Static Screens or Comminuting Devices
(c) Grit Removal
or
(d) Mechanical or Aerated Grk Removal 2
(e) Flow Measuring Device 1
or
(f) Instrumented Flow MeasurementC2
(g) Preaeratlon
(h) Influent Flow Equalization
(1)
2
Grease or Oil Separators - Gravity 2
Mechanical .3
Dissolved Air Flotation .8
(J) Prochbrination .5
(4) PRIMARY TREATMENT WiTS/PROCESSES
(a) Septic Tank (see definition No. 43) 2
(b) !mhoff Tank
(c) Primary Clarifiers dp.
(d) Settling Ponds or Settling Tanks for inorganic Nontoxic Materials (sludge handling facilities for water
purification plaids, sand, gravel. stone. and other mining operations except recreational activities such as gem
or gold mining) 2
(5) SECONDARY TREATMENT
(a) Carbonaceous Stage
(1) Aeration -High Purity Oxygen System .20
10
Diffused Air System
Mechanical Air System (fixed. floating or rotor)
Separate Sludge Reaeratlon
(II) Trickling Aker
High Rate 7
Standard Rate .5
Packed Tower .5
(ifl) Biological Aerated Fitter or Aerated Biological Filter .........» .................... »»........».......».»».10
(iv) Aerated Lagoons 10
(v) Rotating Biological Contactors 10
(vi) Sand Filters -intermittent biological 2
Recirculating biological .3
(WI) Stabilization Lagoons 5
(viii) Clarifier
(Ix) Single stage system for combined carbonaceous removal of BOD and nitrogenous remov
nitrification (see definition No. 12)(Points for this item have to be in addition to items
(5)(a)(I) through (5)(a)(viii).
utilizing the extended aeration process (see definition No.3a)
utilizing other than the extended aeration process.
(x) Nutrient additions to enhance BOO removal
(xl) Biological Culture ('Super Bugs')addition
(b) Nitrogenous Stage
(i) Aeration - High Purity Oxygen System
Diffused Air System
Mechanical Air System (fixed. floating or rotor)
Separate Sludge Reaeration
(11) Trickling Filter -High Rate
Standard Rate
Packed Tower
(III) Biological Aerated Filter or Aerated Biological Filter
(iv) Rotating Biological Contactors
(v) Sand Fitter - intermittent biological
Recirculating biological
(vI) Clarifier
(6) TERTIARY OR ADVANCED TREATMENT UsNTS/PROCESSES
(a) Activated Carbon Beds -
without carbon regeneration.
with carbon regeneration
(b) Powdered or Granular Activated Carbon Feed -
without carbon regeneration
with carbon regeneration
2
8
5
5
20
10
.8
3
7
5
.5
10
10
2
3
5
5
15
5
15
(c) Air stripping .5
(d) Denitrfficatbn Process. 10
(0) Electrodlalysis .5
(f) Foam Separation .5
(g) Ion Exchange .5
(h) Land Application of Treated Effluent (see definition No. 22b) (not applicable for sand. gravel. stone
and other similar mining operations) by high rate infiltration 4
(1) Microscreens .5
(J) Phosphorous Removal by Biological Processes (See definition No. 26) 2 0
(k) Polishing Ponds - without aeration 2
with aeration 5

(I) Post Aeration - cascade 0
diffused or mechanical 2
(m) Reverse Osmosis £
(n) Sand or Mixed -Media Fitters - low rate
high rate 5
(o) Treatment processes for removal o1 metal or cyanide 1 5
(p) treatment processes for removal of toxic materials other than metal or cyanide 15
(7) SLUDGE TREATMENT
(a) Sludge Digestion Tank - Heated (anaerobic) 10
Aerobic .5
Unheated (anaerobic) .3
(b) Sludge Stabilization (chemical or thermal) .5
(c) Sludge Drying Beds - Gravity 2
Vacuum Assisted 5
(d) Sludge Elutriation .5
(0) Sludge Conditioner (chemical or thermal) .5
(f) Sludge Thickener (gravity)
(g) Dissolved Air Flotation Unit (not applicable to a unit rated as (3)(1)) 8
(h) Sludge Gas Utilization (including gas storage) 2
(i) Sludge Holding Tank - Aerated 5
Non -aerated 2
(j) Studge Incinerator (not lnctuding activated carbon regeneration) 10
(k) Vacuum Fitter. Centrifuge. or Filter Press or other similar dewatering devices ....1 0
(8) RESIDUALS UTILIZATION/DISPOSAL (including Incinerated ash)
(a) Lagoons 2
(b) Land Application (surface and subsurface) (see definition 22a)
by contracting to a land application operator or landfill operator who holds the land application permit
or landfill permit 2
(9) (c) Dedicated Landfill(burial) by the permittee of the wastewater treatment facility C)
DIStsFECTICN
(a) Chlorination C. J
(b) Dechlorination 5
(c) Ozone 5
(d) Radiation .5
(10) CHEMICAL ADDITION SYSTEM(S) ( see definition No. 9) [not applicable to chemical additions rated as Item (3)(J).
(5)(a)(x9, (¢)(a). (6) b . (7)(b). (7)(e). (9a), (9)(b) or (9)(c) 5 points each:
List .,.„ Q. d
5
5
(11) MISCELLANEOUS UNfTS,PROCESSES
(a) Holding Ponds. Holding Tanks or Settling Ponds for Organic or Toxic Materials Including wastes from mining
operations containing nitrogen or phosphorus compounds in amounts significantly greater than Is common
for domestic wastewater 4
(b) Effluent Flow Equalization (not applicable to storage basins which are inherent in land application systems) 2
(c)d) Sump Discharge (not applicable to storage basins inherent in land application systems)
(e) Stand -By Power Supply .3
(f) Thermal Pollution Control Device .3
TOTAL POINTS
CIASSIFICATICN
Class! 5-25 Points
Class II 26-50 Points
66-Up Points
Facilities having a rating of one through four points. Inclusive, do not require a certified operator.
Facilities having an activated sludge process will be assigned a minimum classification of Class II.
Facilities having treatment processes for the removal of metal or cyanide will be assigned a minimum classification of Class II.
Facilities having treatment processes for the biological removal of phosphorus will be assigned a minimum classification of Class III.
D0004 DEFINRIONS
The following definitions shall apply throughout this Subchapter.
(1) Activated Carbon Beds. A physical/chemical method for reducing soluble organic material from wastewater effluent; The column -type beds used in this
method will have a flow rate varying from two to eight gallons per minute per square foot and may be either upttow or downflow carbon beds. Carbon may or
may not be regenerated on the wastewater treatment plant site;
(2) Aerated Lagoons. A basin in which all solids are maintained In suspension and by which biological oxidation or organic matter is reduced through artificially
accelerated transfer of oxygen on a flow -through basis;
(3) Aeration. A process of bringing about Intimate contact between air or high purity oxygen In a liquid by spraying, agitation or dlffuston;(3a) Extended
Aeration. An activated sludge process utilizing a minimum hydraulic detention time of 18 hours.
(4) Agricutturalty managed site. Any site on which a crop is produced, managed. and harvested (Crop includes grasses. grains. trees, etc.);
(5) Air Stripping. A process by which the ammonium ion Is first converted to dissolved ammonia (pH adjustment) with the ammonia then released to the
atmosphere by physical means; or other similar processes which remove petroleum products such as benzene. toluene. and xytene;
(6) Carbon Regeneration. The regeneration of exhausted carbon by the use of a furnace to provide extremely high temperatures which volatilize and oxidize the
absorbed Impurities;
(7) Carbonaceous Stage. A stage of wastewater treatment designed to achieve 'secondary' effluent limits;
(8) Centrifuge. A mechanical device In which centrifugal force Is used to separate solids from liquids or to separate liquids of dfffergnt denskias;
(9) Chemical Addhion Systems- The addition of chemicat(s) to wastewater at an application point for purposes of improving solids removal. pH adjustment.
alkattntty control. etc.; the capability to experiment with different chemicals and different application points to achieve a specific result will be considered one
system; the capability to add chemicals) to dual units will be rated as one system; capability to add a chemical at a different application points for different
purposes will result in the systems being rated as separate systems;
(10) Chemical Studge Conditioning. The addition of a chemical compound such as lime. ferric chloride. or a polymer to wet sludge to coalesce the mass prior to
its application to a dewatering device;
(11) Closed Cycle Systems. Use of holding ponds or holding tanks for containment of wastewater containing inorganic. non -toxic materials from sand. gravel.
crushed stone or other similar operations. Such systems shall carry a maximum of two points regardless of pumping facilities or any other appurtenances;
(12) Combined Removal of Carbonaceous BOO and Nitrogenous Removal by Nitrification- A single stage system required to achieve permit effluent limits on BOD
and ammonia nitrogen within the same biological reactor.
(13) Dechlorinatton. The partial or complete reduction of residual chlorine In a liquid by any chemical or physical process;
(14) Denttrification Process. The conversion of nitrate -nitrogen to nitrogen gas;

(15) Electrodiatysls. Process for removing ionized salts from water through the use of ion -selective ion -exchange membranes;
(16) Fitter Press. A process operated mechanically for partially dewatering sludge;
(17) Foam Separation. The planned frothing of wastewater or wastewater effluent as a means of removing excessive amounts of detergent materials through
the Introduction of air In the form of fine bubbles; also called foam fractionation;
(18) Grtt Removal. The process of removing grit and other heavy mineral matter from wastewater;
(19) Imhoff Tank. A deep two story wastewater tank consisting of an upper sedimentation chamber and a lower sludge digestion chamber.
(20) Instrumented Flow Measurement. A device which indicates and records rate of flow;
(21) ion Exchange. A chemical process in which ions from two different molecules are exchanged;
(22) Land application:
(a) Sludge Disposal. A final sludge disposal method by which wet sludge may be applied to land either by spraying on the surface or by subsurface injection
(i.e.. chisel plow); [not applicable for types of sludge described in (11) of this Rule];
(b) Treated Effluent. The process of spraying treated wastewater onto a land area or other methods of application d wastewater onto a land area as a
means of final disposal or treatment;
(23) Microscreen. A low speed, continuously back -washed. rotating drum filter operating under gravity conditions as a polishing method for removing
suspended solids from effluent;
(24) Nitrification Process. The biochemical conversion of unoxldized nitrogen (ammonia and organic nitrogen) to oxidized nitrogen (usually nitrate);
(25) Nitrogenous Stage. A separate stage of wastewater treatment designed for the specific purpose of converting ammonia nitrogen to nitrate nitrogen;
(26) Phosphate Removal. Biological. The removal of phosphorus from wastewater by an oxidanoxic process designed to enhance luxury uptake of phosphorus
by the microorganisms;
(27) Polishing Pond. A holding pond following secondary treatment with sufficient detention time to allow settling of finely suspended solids;
(28) Post Aeration. Aeration following conventional secondary treatment units to Increase effluent O.O. or for any other purpose;
(29) Post Aeration. (Cascade) A polishing method by which dissolved oxygen Is added to the effluent by a nonmechanical. gravity means of flowing down a
series of steps or weirs; The flow occurring across the steps or weirs moves in a fairly thin layer and the operation of the cascade requires no operator
adjustment; thus. zero points are assigned even though this Is an essential step to meeting the limits of the discharge permit;
(30) Powdered to Granular Activated Carbon Feed. A blophyslcal carbon process that utilizes biological activity and organic absorption by using powdered or
granular activated carbon; Virgin or regenerated carbon Is feed controlled into the system;
(31) Preaeratlon. A tank constructed to provide aeration prior to primary treatment;
(32) Preliminary Units. Unit operations in the treatment process. such as screening and comminution. that prepare the liquor for subsequent major operations;
(33) Industrial Pretreatment.
(a) Pre-treatment Unit. Industrial. The conditioning of a waste at Its source before discharge, to remove or to neutralize substances injurious to sewers and
treatment processes or to effect a partial reduction In load on the treatment process which is operated by the same governing body as the wastewater
treatment plant being rated;
b) Pre-treatment Program, Industrial - must be a State or EPA required program to receive points on the rating sheet;
(34) Primary Clarifiers. The first settling tanks through which wastewater is passed In a treatment works for the purpose of removing settleable and suspended
solids and 1300 which Is associated with the solids;
(35) Pumps. All influent. effluent and in -plant pumps;
(36) Radiation. Disinfection or sterilization process utilizing devices emitting ultraviolet or gamma rays;
(37) Reverse Osmosis. A treatment process In which a heavy contaminated liquid Is pressurized through a membrane forming nearly pure liquid free from
suspended solids;
(38) Rotating Biological Contractors. A fixed biological growth process In which wastewater flows through tanks in which a series of partially submerged circular
surfaces are rotated;
(39) Sand Filters:
(a) intermittent Biological. Filtration of effluent following septic tanks. lagoons. or some other treatment process In which further btodecomposltlon is
expected to produce desired effluents; Hydraulic loading rates on these fitters are computed in gpd/ac and have a resulting low gpm/sf (less than one);
b) Recirculating biological - the same type of sand fitter as defined in Subparagraph (39) (a) of this Rule with the added capability to recycle effluent bads
through the sand fitter.
(40) Sand or Mixed -Media Filters. A polishing process by which effluent limits are achieved through a further reduction of suspended solids;
(a) low rate — gravtty. hydraulically loaded filter with loading rates in the one to three gpmisf range;
(b) high rate — a pressure. hydraulically loaded filter with loading rates in the five gpm/s1 range; At any rate, the loading rate will exceed three gprn'st;
(41) Secondary Clarifiers. A tank which follows the biological unit of treatment plant and which has the purpose of removing sludges associated with the
biological treatment units;
(42) Separate Sludge Reaeration. A part of the contact stabilization process where the activated sludge is transferred to a tank and aerated before returning It
to the contact basin;
(43) Septic Tank. A single -story settling tank In which settled sludge iss In contact with the wastewater flowing through the tank; shall not be applicable for
septic tank systems serving single family residences having capacity of 2.000 gallons or less which discharge to a nitrification field;
(44) Sludge Digestion. The process by which organic or volatile matter and sludge is gastfied. liquefied, mineralized or converted into more stable organic matter
through the activity of living organisms, which Includes aerated holding tanks;
(45) Sludge Drying Beds. An area comprising natural or artlficial layers of porous materials upon which digested sewage sludge Is dried by drainage and
evaporation;
(46) Sludge Elutrfation. A process of sludge conditioning in which certain constituents are removed by successive washings with fresh water or plant effluent;
(47) Sludge Gas Utilization. The process of using sewage gas for the purpose of heating bulldogs. driving engirfes, etc.;
(48) Sludge Holding Tank (Aerated and Nonaerated). A tank utilized for small wastewater treatment plants not containing a digester in which sludge may be
kept fresh. and supernatant withdrawn prior to a drying method (t.e. sludge drying beds); This may be done by adding a small amount of all simply to keep the
sludge fresh. but not necessarily an amount that would be required to achieve stabilization of organic matter. A nonaerated tank would simply be used to
decant sludge prior to dewatering and would not allow long periods (several days of detention) wthout resulting odor problems;
(49) Sludge Incinerators. A furnace designed to bum sludge and to remove ail moisture and combustible materials and reduce the sludge to a sterile ash;
(50) Sludge Stabilization (Chemical or Thermal). A process to make treated sludge less odorous and putrescrble. and to reduce the pathogenic organism
content; This may be done by pH adjustment, chlorine dosing. or by heat treatment;
(51) Sludge Thickener. A type of sedimentation tank In which the sludge Is permitted to settle and thicken through agitation and gravtty;
(52) Stabilization Lagoon. A type of oxidation lagoon in which biotogical oxidation of organic matter is effected by natural transfer of oxygen to the water from
air (not a polishing pond);
(53) Stand -By Power Supply. On site or ponabie etectrkal generating equipment;
(54) Static Screens. A stationary screen designed to remove solids. including non•bbdegradable particulate (floatabte solids. suspended solids and BOD
reduction) from municipal and Industrial wastewater treatment systems;
(55) Tertiary Treatment. A stage of treatment following secondary which is primarily for the purpose of effluent polishing; A settling lagoon or sand or coal fitter
might be employed for this purpose;
(56) Thermal Pollution Control Device. A device providing for the transfer of heat from a fluid flowing in tubes to another fluid outside the tubes, or vice versa;
or other means of regulating liquid temperatures;
(57) Thermal Sludge Conditioner. A conditioning process by which heat Is added for a protracted period of time to Improve the dewaterabiltty of sludge by the
solubilizing and hydraullzing of the smaller and more highly hydrated sludge particles;
(58) Toxic Materials. Those wastes or combinations of wastes. including disease -causing agents which after discharge and upon exposure, Ingestion. tnhalatbn
or assimilation into any organism. either directly from the environment or indirectly by ingestion through food chains, will cause death. disease. behavioral
abnormalities. cancer. genetic mutations. physiological malfunctions (including malfunctions in reproduction) or physical deformations. in such organisms or their
offspring; Toxic materials Include. by way of illustration and rat limitation: lead. cadmium. chromium. mercury. vanadium. arsenic. zinc. ortho-nitro-chtorobenzene
(ONCB), polychlorinated blphenyls (PCBs) and dichlorodiphenyl trichloroethane (DDT); and any other materlals that have or may hereafter be determined to have
toxic properties;
(59) Trickling Fitter. A biological treatment unit consisting of a material such as broken stone or rock over which wastewater is distributed; A high rate trickling
litter Is one which operated at between 10 and 30 mgd per acre. A low rate trickling filter Is one which is designed to operate at one to tour mgd per acre;
(60) Trickling Fitter (Packed Tower). A plug flow type of operation In which wastewater flows down through successive layers of media or filtrate material; Organic
material is removed continually by the active biological fixed growth In each successive layer. Thls method may produce 'secondary' quality effluent, or maybe
adapted to produce a nitrified effluent;
(61) Vacuum Filter. Centrifuges. or Fitter Presses. Devices which are designed to remove excess water from either digested or undigested sludge prior to disposal
or further treatment.

North Carolina Division of Environmental Management
Water Quality Section / Intensive Survey Group
March 12, 1992
MEMORANDUM
To: Ruth Swanek
Through: Jay Sauber
From: Howard Bryant
Subject: Long-term BOD Analysis forMarion-Corpening WWTP
County: McDowell
NPDES #NC0031879
Receiving Stream: Youngs Fork
Sub -basin: 030830
DAY LIM TKN-N NOX-N I1+11
0 0.13 1.0 12.00 13.0
5 3.39 0.19 1.1 12.00 13.0
10 5.81 0.11 0.9 11.00 12.0
15 7.51 0.08 0.8 11.00 12.0
20 8.46 0.04 0.8 11.00 12.0
25 9.01
30 9.55 0.05 0.8 11.00 12.0
35 10.29
40 10.95
50 11.82
60 13.33 0.08 0.8 12.00 13.0
70 14.54
80 15.03
90 15.45 0.05 0.6 12.00 13.0
100 15.93
110 16.32
120 16.48 0.16 0.6 13.00 14.0
172 17.63
Date Collected: October 17, 1991
0900-0830
Collected by: Reid
pH: 8.4
Test evaluation: excellent
Seeded: seeded
cc: Central Files C GOT) =
Regional Water Quality Supervisor
3-i2 x � = 9,
3 ,(Ve \ivv‘
S, 3q
ww�_V' c„i..0,