NC0090000_Permit Rating Sheet_20220913

NPDES Permit Rating Work Sheet ✓❑Regular Addition
❑Discretionary Addition
Score change,but no
NPDES No.: NCO090000 status change
Facility Name: ❑Deletion
Colonial Pipeline Company- 2020-L1-SR2448
City:Huntersville, NC
Receiving Water: North Prong Clark Creek [Stream Index 13-17-4-1] [HUC: 030401050101]
Reach Number:
Is this facility a steam electric power plant(SIC=4911) Is this permit for a municipal separate storm sewer
with one or more of the following characteristics? serving a population greater than 100,000?
1. Power output 500 MW or greater(not using a cooling pond/lake) ❑YES;score is 700(stop here)
2.A nuclear power plant
3.Cooling water discharge greater than 25%of the receiving stream's 7Q10 flow rate ✓❑NO(continue)
❑YES;score is 600(stop here) ✓❑NO(continue)
FACTOR 1:Toxic Pollutant Potential
PCS SIC Code: Primary SIC Code: 4613
Other SIC Codes:
Industrial Subcategory Code: 0 (Code 000 if no subcategory)
Determine the Toxicity potential from Appendix A. (Be sure to use the TOTAL toxicity potential column and check one)
Toxicity Group Code Points Toxicity Group Code Points Toxicity Group Code Points
No process ❑3. 3 15 7 7 35
❑waste streams 0 0 B. 4 20 8. 8 40
❑1. 1 5 ❑5. 5 25 9. 9 45
❑2. 2 10 6. 6 30 10. 10 50
Code Number Checked: 9
Total Points Factor 1: 45
FACTOR 2: Flow/Stream Flow Volume (Complete either Section A or Section B;check only one)
Section A-Wastewater Flow Only Considered Section B-Wastewater and Stream Flow Considered
Wastewater type Code Points Wastewater type Percent of Instream
(See Instructions) (See Instructions) Wastewater Concen-
Type I: Flow<5 MGD 11 0 tration at Receiving
Flow 5 to 10 MGD 12 10 Stream Low Flow Code Points
Flow>10 to 50 MGD 13 20
Flow>50 MGD 14 30 Type 1/III: <10% 41 0
>10%to<50% 42 10
Type II: Flow<1 MGD 21 10 >50% ✓ 43 20
Flow 1 to 5 MGD 22 20
Flow>5 to 10 MGD 23 30 Type II <10% 51 0
Flow>10 MGD 24 50 >10%to<50% 52 20
>50% ❑ 53 30
Type III: Flow<1 MGD 31 0
Flow 1 to 5 MGD 32 10
Flow>5 to 10 MGD 33 20
Flow>10 MGD 34 30
Code Checked from Section A or B: 43
Total Points Factor 2: 20
1

NPDES Permit Rating Work Sheet
FACTOR 3: Conventional Pollutants NPDES No.: NCO090000
(only when limited by the permit)
A. Oxygen Demanding Pollutants (check one)❑BOD❑COD❑OTHER:
Code Points
Permit Limits(check one) <100lbs/day 1 0
100 to 1000 Ibs/day 2 5
>1000 to 3000 Ibs/day 3 15
>3000lbs/day 4 20
Code Checked:
Points Scored: 0
B.Total Suspended Solids (TSS)
Code Points
Permit Limits(check one) <100 Ibs/day 1 0
✓ 100 to 1000 Ibs/day 2 5
>1000 to 5000 Ibs/day 3 15
❑ >5000lbs/day 4 20
Code Checked: 2
Points Scored: 5
C. Nitrogen Pollutants (check one) ❑ Ammonia ❑ OTHER:
Nitrogen Equivalent Code Points
Permit Limits(check one) <300 Ibs/day 1 0
300 to 1000 Ibs/day 2 5
>1000 to 3000 Ibs/day 3 15
>3000lbs/day 4 20
Code Checked:
Points Scored: 0
Total Points Factor 3:
FACTOR 4: Public Health Impact
Is there a public drinking water supply located within 50 miles downstream of the effluent discharge (this includes any body of
water to which the receiving water is a tributary)? A public drinking water supply may include infiltration galleries, or other
methods of conveyance that ultimately get water from the above referenced supply.
❑YES (if yes, check toxicity potential number below)
WINO (if no, go to Factor 5)
Determine the human health toxicity potential from Appendix A. Use the same SIC Code and subcategory reference as in
Factor 1. (Be sure to use the human health toxicity group column and check one below)
Toxicity Group Code Points Toxicity Group Code Points Toxicity Group Code Points
3. 3 0 7. 7 15
❑ No process
waste streams 0 0 4. 4 0 8. 8 20
❑1. 1 0 5. 5 5 9. 9 25
❑2. 2 0 6. 6 10 10. 10 30
Code Number Checked:
Total Points Factor 4:
2

NPDES Permit Rating Work Sheet
FACTOR 5: Water Quality Factors NPDES No.: NCO090000
A. Is (or will) one or more of the effluent discharge limits based on water quality factors of the receiving stream (rather than
technology-based federal effluent guidelines, or technology-based state effluent guidelines), or has a wasteload allocation
been assigned to the discharge?
Code Points
-, YES 1 10
FINO 2 0
B. Is the receiving water in compliance with applicable water quality standards for pollutants that are water quality limited in the
permit?
Code Points
✓ YES 1 0
❑NO 2 5
c. Does the effluent discharged from this facility exhibit the reasonable potential to violate water quality standards due to whole
effluent toxicity?
Code Points
YES 1 10
VINO 2 0 Code Number Checked:A. 1 B. 2 C. 2
Total Points Factor 5 A. 10 +g 0 +C. 0 = 0
FACTOR 6: Proximity to Near Coastal Waters
A. Base Score:Enter flow code here (from Factor 2): 43 Enter the multiplication factor that corresponds
to the flow code: 0.00
Check appropriate facility HPRI Code(from PCS):
HPRI# Code HPRI Score Flow code Multiplication Factor
1 1 20 11,31,or41 0.00
12,32,or 42 0.05
2 2 0 13,33,or 43 0.10
14 or 34 0.15
3 3 30 21 or 51 0.10
4 4 0 22 or 52 0.30
23 or 53 0.60
5 5 20 24 1.00
HPRI Code Checked:
Base Score(HPRI Score) 0 x(Multiplication Factor) 0.00 = 0 (Total Points)
B. Additional Points—NEP Program c. Additional Points— Great Lakes Area of Concern
For a facility that has an HPRI code of 3,does the facility For a facility that has an HPRI code of 5,does the facility
discharge to one of the estuaries enrolled in the National discharge any of the pollutants of concern into one of the
Estuary Protection(NEP)program(see instructions)or Great Lakes'31 areas of concern(see instructions)?
the Chesapeake Bay?
Code Points Code Points
YES 1 10 YES 1 10
NO 2 0 ❑NO 2 0
Code Number Checked:A. B. C.
Total Points Factor 6 A. 0 +B, 0 +C. 0 = 0
3

NPDES Permit Rating Work Sheet
Score Summary NPDES No.: NCO090000
Factor Description Total Points
1. Toxic Pollutant Potential 45
2. Flow/Streamflow Volume 20
3. Conventional Pollutants 5
4. Public Health Impacts 0
5. Water Quality Factors 10
6. Proximity to Near Coastal Waters 0
TOTAL(Factors 1 through 6) 80
S1. Is the total score equal to or greater than 80? ❑YES(Facility is a major) ✓❑ NO
S2. If the answer to the above question is no,would you like this facility to be discretionary major?
✓❑ NO
❑YES(Add 500 points to the above score and provide reason below:
Reason: The Colonial Pipeline spill at Huntsville is a high profile incident that will require
oversight by the EPA.
NEW SCORE: 80
OLD SCORE:
Derek Denard
Permit Reviewer's Name
[phone]
Phone Number
09/13/2022
Date
Reset Form
4

Attachment 132: NCO090000 Facility Rating Notes
FACTOR 1: Toxic Pollutant Potential
Review of applicable SIC codes from OSHA SIC codes manual https://www.osha.gov/data/sic-manual
Division E: Transportation, Communications,Electric, Gas,And Sanitary Services
Major Group 46: Pipelines,Except Natural Gas: This major group includes establishments
primarily engaged in the pipeline transportation of petroleum and other commodities, except
natural gas. Pipelines operated by petroleum producing or refining companies and separately
reported are included. Establishments primarily engaged in natural gas transmission are
classified in Industry 4922.
4612 Crude Petroleum Pipelines: Establishments primarily engaged in the pipeline
transportation of crude petroleum.Field gathering lines are classified in Mining,Major
Group 13.
• Crude petroleum pipelines
4613 Refined Petroleum Pipelines: Establishments primarily engaged in the pipeline
transportation of refined products of petroleum, such as gasoline and fuel oil.
• Gasoline pipelines, common carriers
• Refined petroleum pipelines
4619 Pipelines,Not Elsewhere Classified: Establishments primarily engaged in the
pipeline transportation of commodities, except crude petroleum,refined products of
petroleum, and natural gas. Establishments primarily engaged in the pipeline
transportation of refined petroleum are classified in Industry 4613,and those engaged in
natural gas transmission are classified in Industry 4922.
• Coal pipeline operation
• Pipeline operation except petroleum and natural gas pipelines
• Slurry pipeline operation
Division F: Wholesale Trade:
Major Group 51: Wholesale Trade-non-durable Goods. This major group includes
establishments primarily engaged in the wholesale distribution of non-durable goods.
5171 Petroleum Bulk stations and Terminals: Establishments primarily engaged in the
wholesale distribution of crude petroleum and petroleum products, including liquefied
petroleum gas, from bulk liquid storage facilities.
• Petroleum bulk stations and terminals-wholesale
Attachment B3: Worksheet-NPDES-PermitRating-Ss-EPAmemo-AppendixA-1990-Jun27 41:
The NPDES application indicated a SIC code of 4619 for Pipeline,Not Else Classified.
The best for the Colonial Pipeline would be SIC code 4613 for Refined Petroleum

Pipelines. There is not a total toxicity number given for 4613. Page 41 of Attachment B3
gives the SIC code of 4612 for Crude Petroleum Pipelines which has the total toxicity
number of 8. Petroleum Bulk Stations &Terminals SIC 5171 is also given a total toxicity
number of 8. Petroleum Bulk Stations &Terminals store refined petroleum. Considering
these similar SIC codes, a total toxicity number of 8 will be used to rate the Colonial
Pipeline groundwater remediation system. It should also be noted that chlorinated solvents
are present at the spill site. The SIC code 2869 for industrial organic chemicals,not
elsewhere classified, is given a total toxicity of 9 (commodity&bulk)and 10 (organic
pesticide chemicals mfg). The manufacture of the many of the solvents present are listed
under SIC code 2869. There are no SIC codes for the transportation of chlorinated
solvents. Petroleum refining SIC code 2911 is given total toxicity number of 9.
The toxicity group was checked with code 8 giving 40 points.
FACTOR 2: Flow/Stream Flow Volume
Attachment 134: NC0090000 RPA Calculation of IWC:
The RPA spreadsheet indicates an IWC of 78.12%based on a flow of 0.576 MGD and
summer 7Q 10 of 0.25 cs£
Attachment B5: Worksheet-NPDES-PermitRating-Ss-EPAmemo-AppendixA-1990-Jun27 9:
Does discharge contain only noncontact cooling water?No
Does discharge contain only process wastewater?No
Does discharge contain neither noncontact cooling water nor process wastewater?Yes,
Type III.
Section B Type I/III was selected for the precent of instream wastewater concentration at
receiving stream low flow of>50%with code 43 giving 20 points.
FACTOR 3: Conventional Pollutants
There are no oxygen demanding pollutants of concern.
TSS will be given secondary treatment standards of 30 mg/1 for a month average limit and 45
mg/l for a daily maximum limit. Loading is calculated using the Attachment B6_EPA rating BOD
TSS TN calculations spread sheet. Converting 30 mg/1 to lbs/day using a flow of 0.576 MGD
gives 144.2 lbs/day. Selected 100 to 1000 lbs/day Code 2 for 5 points.
There will be no limitation of nitrogen pollutants.
FACTOR 4: Public Health Impact
Attachment 137: Nearest Water Supply Waters ArcGIS Online:
The nearest waters currently classified as water supply waters is located>>45.1 miles
downstream from the proposed outfall.
Answer"No"for greater than 50 miles.

FACTOR 5: Water Quality Factors
A. Is (or will)one or more of the effluent discharge limits based on water quality factors of the
receiving stream(rather than technology-based federal effluent guidelines, or technology-
based state effluent guidelines), or has a wasteload allocation been assigned to the discharge?
Effluent limits will be based on water quality factors of the receiving stream. Yes, Code 1 for
10 points.
B. Is the receiving water in compliance with applicable water quality standards for pollutants
that are water quality limited in the permit?North Prong Clarke Creek[13-17-4-1] (Outfall
001) and South Prong Clarke Creek[13-17-4-2] (Seeps 1 &2 as identified by the applicate)
are not currently listed as impaired. See Attachment
B8_NC_2020_INTEGRATED_REPORT p 1305. The streams are tributary to Clark Creek.
The segment [13-17-4] for Clark Creek, immediately downstream(— 1 mile)at the
confluence of the two tributaries, is impaired for Fair, Poor or Severe Bio classification for
Fish Community. See Attachment B9_NC_2020_Category5_303dlist p 182. and Attachment
B 10_NC DRAFT 2020 INTEGRATED REPORT VIEWER. (Please note that this
information has not changed for the 2022 Integrated Report or 2022 303d Listing.) Since
there is no impairment for parameters that are water quality limited the answer is: Yes, Code
1 for 0 points.
C. Does the effluent discharged from this facility exhibit the reasonable potential to violate
water quality standards due to whole effluent toxicity?This is a new groundwater
remediation discharge with no effluent available for an RPA.Answer:No, Code 2 for 0
points.
FACTOR 6: Proximity to Near Coastal Waters. Parts A,B and C are not applicable. The facility is not
located near coastal waters.

APPENDIX A
SIC Code Cross Reference
and Tota( and Hunan Health Toxicity Number
1972/ Hunan
1977 1987 CFR Health Total Industr
SIC SIC 1987 CFR Sub- Sub-part title Toxicity Toxicity Subcat
Code Code Title Part Part Munger Munber Number
3914 3914 SILVERWARE AND PLATED WARE MR NO ELECTROPLATING 1 1 99
3915 3915 JEWELERS' MATERIALS i LAPIDARY WORK 433 A METAL FINISHING 1 9 0
3915 3915 JEWELERS' MATERIALS Z LAPIDARY WORK MR NO ELECTROPLATING 1 1 99
3931 3931 MUSICAL INSTRUMENTS MR NO ELECTROPLATING 1 1 99
3931 3931 MUSICAL INSTRUMENTS 433 A METAL FINISHING 1 .9 0
3942 3942 DOLLS MR 1 1 99
3944 3944 GAMES, TOYS AND CHILDREN'S VEHICLES 433 A METAL FINISHING 1 9 0
3944 3944 GAMES, TOYS AND CHILDREN'S VEHICLES MR NO ELECTROPLATING 1 1 99
3949 3949 SPORTING AND ATHLETIC GOODS, NEC 433 A METAL FINISHING 1 9 1
3949 3949 SPORTING AND ATHLETIC GOODS, NEC MR NO ELECTROPLATING 1 1 99
3949 3949 SPORTING AND ATHLETIC GOODS, NEC 433 A METAL FINISHING 1 1 2
3951 3951 PENS AND MECHANICAL PENCILS MR NO ELECTROPLATING 1 1 99
3951 3951 PENS AND MECHANICAL PENCILS 433 A METAL FINISHING 1 9 0
3952 3952 LEAD PENCILS AND ART GOODS MR 1 1 99
3953 3953 MARKING DEVICES MR 1 1 99
3955 3955 CARBON PAPER AND INKED RIBBONS MR 1 1 99
3961 3%1 COSTUME JEWELRY MR NO ELECTROPLATING 1 i 99
3%1 3961 COSTUME JEWELRY 433 A METAL FINISHING 1 9 0
3962 3499 ARTIFICIAL FLOWERS MR 1 1 99
3964 3%5 NEEDLES, PINS AND FASTENERS 433 A METAL FINISHING 1 9 0
3964 3965 NEEDLES, PINS AND FASTENERS MR NO ELECTROPLATING 1 1 99
3991 3991 BROOMS AND BRUSHES 433 A METAL FINISHING 1 9 0
3991 3991 BROOMS AND BRUSHES RR NO ELECTROPLATING 1 1 99
3993 3993 SIGNS AND ADVERTISING DISPLAYS 433 A METAL FINISHING 1 9 0
3993 3993 SIGNS AND ADVERTISING DISPLAYS MR 1 1 99
3993 3993 SIGNS AND ADVERTISING DISPLAYS MR NO ELECTROPLATING 1 1 99
3995 3995 BURIAL CASKETS MR NO ELECTROPLATING 1 1 99
3995 3995 BURIAL CASKETS 433 A METAL FINISHING 1 9 0
3996 3996 HARD SURFACE FLOOR COVERINGS MR 1 1 99
39% 3996 HARD SURFACE FLOOR COVERINGS 443 D LINOLEUM i PRINTED ASPHALT FELT 1 1 0
3999 3999 MANUFACTURING INDUSTRIES, NEC 433 A METAL FINISHING 1 9 0
3999 39" MANUFACTURING INDUSTRIES, NEC MR 1 1 99
4172 4173 BUS TERMINAL AND SERVICE FACILITIES MR 1 1 99
4226 4226 SPECIAL WAREHOUSING L STORAGE, NEC MR 1 1 99
4231 4231 TRUCKING TERMINAL FACILITIES 5 5 0
4469 4493 WATER TRANSPORTATION SERVICES, NEC 5 5 1
4469 4959 WATER TRANSPORTATION SERVICES, NEC 5 5 2
4469 4499 WATER TRANSPROTATION SERVICES, NEC 5 5 3
4612 4612 CRUDE PETROLEUM PIPELINES NR a a 0
4911 4911 ELECTRICAL SERVICES 423 A HYDRO ELECTRIC PWR GEN.(W/ SAW. WST.) 6 6 1
4911 4911 ELECTRICAL SERVICES 423 A STEAM ELECTRIC POWER GENERATING 6 6 2
4931 4931 ELECTRIC AND OTHER SERVICES COMBINED 423 A HYDRO ELECTRIC PWR. GEN. (W/ SAM. VST.) 6 6 1
4931 6931 ELECTRIC AMD OTHER SERVICES COMBINED 423 A STEM! ELECTRIC POWER GENERATING 6 6 7
4941 4941 WATER SUPPLY 7 7 0
4952 4952 SEWERAGE SYSTEMS 1 1 0
4953 4953 REFUSE SYSTEMS SOLID WASTE FACILITIES 7 7 1
4953 4953 REFUSE SYSTEMS HAZARDOUS WASTE TREATMENT FACILITIES 10 10 2
4959 4959 SANITARY SERVICES, NEC I 1 0
4961 4961 STEAM SUPPLY 1 1 0
5052 $052 COAL i OTHER MINERALS i ORES 8 a 0
5093 5093 SCRAP L WASTE MATERIALS 10 10 0
5143 5143 DAIRY PRODUCTS 405 A RECEIVING STATIONS 1 1 D
5161 5169 CHEMICALS AND ALLIED PRODUCTS 10 10 0
5171 5171 PETROLEUM SULK STATIONS L T:RMIMALS a a 0

Colonial Pipeline Company—2020-L1-SR2448 REASONABLE POTENTIAL ANALYSIS Outfall 001
NCO090000 2018 Generic RPA-95% Probability/95% Confidence Qw = 0.576 MGD
MAXIMUM DATA POINTS=58
Qw(MGD)= 0.5760 WWTP/WTP Class: PC-1
1Q10S(cfs)= 0.21 IWC% @ 1Q10S = 80.9575626
7Q10S(cfs)= 0.25 IWC% @ 7Q10S= 78.1239062
7Q10W(cfs)= 0.42 IW%C @ 7Q10W= 68.0073126
30Q2(cfs)= 0.56 IWC%@ 30Q2= 61.4537445
Avg.Stream Flow,QA(cfs)= 3.90 IWC%@ QA= 18.6279419
Receiving Stream: North Prong Clark Creek HUC 30401050101 Stream Class: C
PARAMETER NC STANDARDS OR EPA CRITERIA J REASONABLE POTENTIAL RESULTS RECOMMENDED ACTION
TYPEApplied CY Chronic Standard Acute a n #Det. Max Pred Cw Allowable Cw
Acute:
0 0 N/A —Chr_
- on_ic: ---------------------------
Acute:
0 0 N/A —Chr_
- on_ic:---------- ----------------------------
Acute:
0 0 N/A —Chr_
- on_ic:---------------------------------------
Acute:
0 0 N/A —Chr_
- on_ic:---------- ----------------------------
Acute:
0 0 N/A —Chr_
- on_ic:---------------------------------------
Acute:
0 0 N/A
--Chronic:---------- ---------------------------
Acute:
0 0 N/A —Chr_
- on_ic:---------------------------------------
Acute:
0 0 N/A —Chr_
- on_ic:---------------------------------------
Acute:
0 0 N/A —Chr_
- on_ic:---------------------------------------
Acute:
0 0 N/A —Chr_
- on_ic:---------- ----------------------------
NCO090000 RPA,rpa
Page 1 of 1 8/22/2021

Figure 1
Wastewater Type Selection Flow Diagram
Start
Does discharge contain Yes
only noncontact Type
cooling water?
No
Does discharge contain
only process Yes Type II
wastewater?
No
Does discharge contain
neither noncontact Yes
cooling water nor Type III
process wastewaters?
No
Is process watewater
flow greater than Yes Type II
1 MGD?
No
Is process wastewater
flow greater than 10% Ye' Type e 11
of the total discharge?
No
Is noncontact cooling
water greater than 90% Ye' P. Type I
of the total discharge?
No
Type III
3

NC0090000
Limit
BOD 0 mg/I 0.000000 Ib/gal 0.0 lb/day
Flow 576,000 gpd
TSS 30 mg/I 0.000250 Ib/gal 144.2 lb/day
Flow 576,000 gpd
NH3 0 mg/I 0.000000 Ib/gal 0.0 lb/day
Flow 576,000 gpd

Measurement
�Ilr
L- marls 1
45.1 Miles1
Glear Surface Water Classifications:Yadkin Pee-Dee
fI itte Stream index: 1 3,-(15.5;
lrj,4-,-_
Stream Name: PEE DEE RIVER
Descr otion: From Norwood Dam to
mouth of Turkey Top Creek
ass;f.cat;on: WS-V,B
Date of Class.: August 2,1992
What does this More info
Class_mean?
r River Basin: Yadkin Pee-Dee
Pre�CTFL to enable snapping
17 + Zoom to ... r
Rock Hill

NORTH CAROLINA 2020 INTEGRATED REPORT
Rocky Yadkin-Pee Dee River Basin
AU Name AU Number Classification AU LengthArea AU Units
AU ID Description
North Prong Clarke Creek 13-17-4-1 C 4.4 FW Miles
2384 From source to Clarke Creek
2020 Draft Water Quality Assessments
PARAMETER IR CATEGORY CRITERIA STATUS REASON FOR RATING
Benthos (Nar, AL, FW) 3a Data Inconclusive Not Rated Bioclassification
Hardy Creek 13-17-42 C 9.0 FW Miles
2385 From source to Rocky River
2020 Draft Water Quality Assessments
PARAMETER IR CATEGORY CRITERIA STATUS REASON FOR RATING
Fish Community (Nar, AL, FW) 5 Exceeding Criteria Fair, Poor or Severe Bioclassificatior
South Prong Clarke Creek 13-17-4-2 C 3.5 FW Miles
2386 From source to Clarke Creek
2020 Draft Water Quality Assessments
PARAMETER IR CATEGORY CRITERIA STATUS REASON FOR RATING
Benthos (Nar, AL, FW) 1 Meeting Criteria Excellent, Good, Natural, Good-Fair,
Ramah Creek 13-17-4-4 C 5.8 FW Miles
2393 From source to Clarke Creek
2020 Draft Water Quality Assessments
PARAMETER IR CATEGORY CRITERIA STATUS REASON FOR RATING
Benthos (Nar, AL, FW) 1 Meeting Criteria Excellent, Good, Natural, Good-Fair,
Clarks Creek 13-17-5-2 C 4.4 FW Miles
2399 From source to Mallard Creek
2020 Draft Water Quality Assessments
PARAMETER IR CATEGORY CRITERIA STATUS REASON FOR RATING
Benthos (Nar, AL, FW) 5 Exceeding Criteria Fair, Poor or Severe Bioclassificatior
7/21/2021 NC 2020 INTEGRATED REPORT Category 5 assessments approved by EPA June 23,2021 Page 1305 of 1334

NORTH CAROLINA 2020 303(D) LIST
Rocky Yadkin-Pee Dee River Basin
AU Name AU Number Classification Length or Area Units
AU ID Description
Little Richardson Creek(Lake Monroe) 13-17-36-4-( WS-IV 77.1 FW Acres
2321 From source to a point 0.6 mile upstream of Buck Branch
PARAMETER IR CATEGORY CRITERIA STATUS REASON FOR RATING 303D YEAR
Chlorophyll a (40 µg/I,AL, NC) 5 Exceeding Criteria Exceeding Criteria with Statistical
Confidence
Little Richardson Creek(Lake Monroe) 13-17-36-4-( WS-IV;CA 38.7 FW Acres
2322 From a point 0.6 mile upstream of Buck Creek to Richardson Creek
PARAMETER IR CATEGORY CRITERIA STATUS REASON FOR RATING 303D YEAR
Water Temperature(322C,AL, LP&CP) 5 Exceeding Criteria Exceeding Criteria with Statistical
Confidence
pH (9.0,AL, FW) 5 Exceeding Criteria Exceeding Criteria with Statistical 2018
Confidence
Chlorophyll a (40 µg/I,AL, NC) 5 Exceeding Criteria Exceeding Criteria with Statistical 2008
Confidence
Stewarts Creek 13-17-36-9-( WS-III 8.3 FW Miles
2334 From source to a point 0.4 mile downstream of mouth of Stumplick Branch
PARAMETER IR CATEGORY CRITERIA STATUS REASON FOR RATING 303D YEAR
Benthos(Nar,AL, FW) 5 Exceeding Criteria Fair, Poor or Severe Bioclassification 2008
Stewarts Creek [Lake Twitty(Lake Stewart)] 13-17-36-9-( WS-III;CA 1.1 FW Miles
2335 From a point 0.4 mile downstream of mouth of Stumplick Branch to Union County SR 1681 (City of
Monroe water supply intake)
PARAMETER IR CATEGORY CRITERIA STATUS REASON FOR RATING 303D YEAR
Chlorophyll a (40 µg/l,AL, NC) 5 Exceeding Criteria Exceeding Criteria with Statistical
Confidence
Clarke Creek 13-17-4 C 5.5 FW Miles
2350 From source to Rocky River
PARAMETER IR CATEGORY CRITERIA STATUS REASON FOR RATING 303D YEAR
Fish Community(Nar,AL, FW) 5 Exceeding Criteria Fair, Poor or Severe Bioclassification 1998
Lanes Creek 13-17-40-(1) WS-V 27.4 FW Miles
2351 From source to Marshville Water Supply Dam (located 0.1 mile downstream of Beaverdam Creek)
PARAMETER IR CATEGORY CRITERIA STATUS REASON FOR RATING 303D YEAR
Benthos(Nar,AL, FW) 5 Exceeding Criteria Fair, Poor or Severe Bioclassification
7/21/2021 NC 2020 303d List-Approved by EPA June 23,2021 Page 182 of 188

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