Chapter 2 - 03010104

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2.1
SubbaSin at a Glance
countieS:
Rockingham, Caswell, Person, &
Granville
MunicipalitieS:
Reidsville, Yanceyville, Milton, & Roxboro
ecoreGionS:
Northern Inner Piedmont,
Southern Outer Piedmont, &
Northern Outer Piedmont
perMitted FacilitieS:
NPDES Dischargers: ..............67
Major ...........................................3 Minor ...........................................8 General .....................................56
NPDES Non-Dischargers: .......26
Stormwater: ............................12
General .....................................11
Individual .....................................1
Animal Operations: .................11
population:
2010 Census ....................50,017
2006 land cover:
Open Water .........................2.2%
Developed ...........................4.7%
Forest ...............................61.8%
Agriculture .........................19.5%
Wetlands .............................1.3%
Barren Land ........................0.2%
Shrub/Grassland ...............10.3%
SubbaSin Water Quality overvieW
The Lower Dan River Subbasin is the second western most subbasin and
runs along the North Carolina/Virginia state line. The subbasin contains
two Impaired streams: Dan River is Impaired for fecal coliform bacteria
and turbidity; and Marlowe Creek is Impaired for biological integrity as
well as zinc in the downstream segment.
During this assessment cycle (2004-2009), the subbasin experienced
a moderate drought in 2005 and 2006 as well as a prolonged drought
between 2007 and 2008. Monitoring the biological community during this
time showed a small percent improved. There were no major ambient
monitoring violations; however, there were a few elevated levels for
turbidity and fecal coliform bacteria.
CHAPTER 2
loWer dan
river SubbaSin
HUC 03010104
Includes: Dan River, Country Line Creek, Lake Roxboro, Hyco
River, Hyco Lake, Marlowe Creek, Mayo Reservoir & Aarons
Creek
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2.2
FiguRe 2-1: LoweR Dan RiveR suBBasin (03010104)
Rattl
e
s
nakeCr Kerr
Reservoir
Rock HouseCr SmithRiverMatrimonyCrNB36NF18
D
A
N
RI
V
E
R
ROCKINGHAM
GUILFORD
CASWELL
ALAMANCE
ORANGE
PERSON
GRANVILLE
PERSON
Yanceyville
Roxboro
Reidsville
J
o
n
e
s
C
r
H
o
g
a
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s
Cr
M
o
o
n
Cr
Rattlesnake C r DAN
R
I
V
ER
C
o
u
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tr
y
Line
Cr
Country
Li
n
eCrHycoCr
Hyco
Lake
Lake
Roxboro
Lake
Issac
Walton MarloweCr
MayoCr
Mayo
ReservoirCrookedFkAaronsCr NF31
NB112
N4590000
ROA0343A
ROA0342AROA0341A
ROA031H
ROA031E
ROA031C
ROA030DE
ROA030DC
ROA030DA
ROA030C
ROA030E
ROA030F
ROA030G
ROA027G
ROA027J
ROA027L
Farmer
Lake
N4250000
N4400000
NB43
NB85
NB118
NB119
NF30
S
o
uthHyco Cr
NB40
NB22
N3500000
NF26
NF24
NF15
NB116
NB84
NF35
N3410000
Stovall
NB64
NB87
NB86
BlueCre
ek
MountainCreek
Johnson
Creek
LittleJohnson
Cre
e
k
LickBranch
CedarBranch
Eden
WentworthReidsville
ROCKINGHAM
DANRIVER NB74
NC-62
US-158
I-40,85
NC-119
US-29
NC-157
I-85
US-70
N
C-57
NC-49
NC-87
US-501
NC-700
NC-61
NC-86
N
C
-1
5
0
NC-96
U
S-2
9-B
U
S
US-15
NC-100
I-40
US-70-BUS
N
C-56
NC-54
NC-87,100
NC-770
NC-61,100
NC-49,54
US-158,501
NC-57
NC-54
US-29-BUS
NC-49
NC-49
I-40,85
NC-86
NC-119
NC-62
US-29
NC-87
NC-61
NC-86
I-85
I-85
NC-49
NC-86
NC-87
US-158
I-85
NC-150
I-40
Lower
Dan
River
Subbasin
(03010104)
Legend
Permits
Animal
Operation
Permits
Monitoring
Sites
2010
Use
Support
Minor
NPDES
Dischargers
Major
NPDES
Dischargers
NPDES
Non-Dischargers
NPDES
Stormwater
Individual
State
Cattle
Swine
Wet
Poultry
NPDES
Aquaculture
Supporting
Not
Rated
No
Data
Impaired
Primary
Roads
Municipalities
County
Boundaries
8-Digit
HUC
#*XY#0Ek"Y
USGS
Gage
Stations
!<
RAMS
(`09-`10)
¢¡
RAMS
(`07-`08)
¢¡
Lake
Stations
^
Benthos
"à)
Fish
Community
[¡
Ambient
¢¡
NC
Division
of
Water
Quality
Basinwide
Planning
Unit
August
2011
¯
0
4
8
12
16
2
Miles
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2.3
Water Quality data SuMMary For thiS SubbaSin
Monitoring stream flow, aquatic biology and chemical/physical parameters is a large part of the basinwide
planning process. More detailed information about DWQ monitoring and the effects each parameter has on
water quality is discussed in Chapters 2 and 3 of the Supplemental Guide to North Carolina’s Basinwide
Planning document.
StreaM FloW
The basin experienced prolonged droughts from 1998-2002 and again from 2007-2008, with moderate
droughts in 2005 and 2006 (Figure 2-2). More detail about flows in the Roanoke River Basin can be found in
the 2010 Roanoke River Basinwide Assessment Report produced by DWQ-Environmental Science Section.
FiguRe 2-2: YeaRLY FLow Rates (CFs) oF tHe usgs gage stations in tHe LoweR Dan
RiveR suBBasin Between 1997 & 2009
0
50
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150
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400
450
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2077200 02077303 02077670
Indicates periods of drought in the Roanoke River Basin
From Left to Right:
• 2077200: Hyco Creek
(Leasburg)
• 2077303: Hyco River
(McGehees)
• 2077670: Mayo Creek
(Bethel Hill)

bioloGical data
Biological samples were collected during the spring and summer months of 2009 by the DWQ-Environmental
Sciences Section as part of the five year basinwide sampling cycle, in addition to special studies. Overall, 12
biological sampling sites were monitored within the Lower Dan River Subbasin. The ratings for each of the
sampling stations can be seen in Appendix 2-B.
Benthic Macroinvertebrate Sampling
Each benthic station monitored during the current cycle is shown in
Figure 2-3 and color coded based on the current rating. Each of the
sites are discussed in more detail in the watershed section below. Figure
2-5 is a comparison of benthic site ratings sampled during the last two
basinwide cycles to indicate if there are any overall shifts in ratings. Of
the two existing sites, one declined and one improved.
benthic SaMplinG SuMMary
£Total Stations Monitored 6
£Total Samples Taken 6
£Number of New Stations 4
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2.4
FiguRe 2-3: BentHiC stations CoLoR CoDeD BY CuRRent Rating in
tHe LoweR Dan RiveR suBBasin
Benthos 2004-2009
Excellent
Good
Good-Fair
Fair
Not Impaired
Not Rated
FiguRe 2-4: CuRRent BentHiC site Ratings
Excellent
Good
Good-Fair
Fair
Poor
Not Rated
Not Impaired
FiguRe 2-5: CHange in BentHiC site Ratings
Improved
Declined
No Change
New Station
Fish Community Sampling
Each fish community station monitored during the current cycle is shown
in Figure 2-6 and color coded based on the current rating. Each of the
sites are discussed in more detail in the watershed section below. Figure
2-7 shows the percentages of each rating given during this sampling cycle
within this subbasin. Figure 2-8 is a comparison of fish community site
ratings sampled during the last two cycles to determine if there are any
overall watershed shifts in ratings. Overall, the community is relatively
stable.
FiguRe 2-6: FisH CommunitY stations CoLoR CoDeD BY CuRRent
Rating in tHe LoweR Dan RiveR suBBasin
Fish 2004-2009
Excellent
Good
Good-Fair
Fair
FiSh coM. SaMplinG SuMMary
£Total Stations Monitored 6
£Total Samples Taken 7
£Number of New Stations 1
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2.5
FiguRe 2-7: CuRRent FisH Comm site Ratings
Excellent
Good
Good-Fair
Fair
Poor
Not Rated
Not Impaired

FiguRe 2-8: CHange in FisH Comm site Ratings
Improved
Declined
No Change
New Station
For more information about biological data in this subbasin, see the 2010 Roanoke River Basinwide
Assessment Report. Detailed data sheets for each sampling site can be found in Appendix 2-B.
Fish Kills/Spill Events
Mayo Creek:
A site visit, conducted on 30 March 2004 by DWQ staff, resulted in the observation of approximately 60
dead common carp in various stages of decay within 500 meters of the reservoir spillway. There were also
approximately 200 live carp congregating in the shallow areas and around spillway. Approximately 50% of
the live carp had sores on top of their head and body. Many carp were very lethargic and unresponsive, as
was a bluehead chub. Live carp were in spawning condition, but no spawning activity was observed. Four
specimens were sent to Warm Springs Fish Health Center, Georgia, for analysis. There are no known causes.
Bowes Branch:
The La. Pacific Corporation plant near Roxboro experienced a serious fire within the production facility. A
subsequent fish kill occurred in the company’s fire pond. During the fire, large quantities of water were pulled
from the pond to spray on the fire. Runoff was at times about 3 to 4 inches deep running from the building
to the stormwater system, thereby returning to the pond. The fire began at 2:41 AM on June 13, 2006, and
the use of water ended about 4:30 PM. Production units that burned included mixers in which the chemicals
methyl diisocyanate, paraformaldehyde, and paraffin wax were being applied to wood. Some undetermined
quantity of these materials returned to the pond with the recycling firewater. There was heavy rain from the
remnants of tropical depression Alberto most of the day of June 14, as well. Dead fish were observed and
reported at about 7:35 AM on June 15. The pond was also observed at that time to have a reddish material
floating along one edge where the wind had moved it. A total of 290 fish were observed killed the first day:
113 bass, 50 carp, and 127 sunfish. None was observed to be diseased, malformed, or otherwise abnormal.
The next day, another 50 were gathered, 20 bass and 30 sunfish. About half were “fresh” enough to have
expired overnight.
aMbient data
The ambient data are used to develop use support ratings every two years, which are then reported to the
EPA via the Integrated Report (IR). The IR is a collection of all monitored waterbodies in North Carolina and
their water quality ratings. The most current IR is the 2010 version and is based on data collected between
2004 and 2008. The ambient data reported in this basin plan were collected between 2005 and 2009 and will
be used for the 2012 IR. If a waterbody receives an Impaired rating, it is then placed on the 303(d) Impaired
Waters List. The Roanoke River Basin portion of the 2010 IR can be found in Appendix 2-A and the full 2010
IR can be found on the Modeling & TMDL Unit’s website.
Four Ambient Monitoring System (AMS) stations are located in the Lower Dan River subbasin (see Figure 2-1
for the station locations). During the current sampling cycle (January 2005 and December 2009), samples
were collected for all parameters on a monthly basis except metals which were sampled quarterly until May
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2.6
2007 when metals sampling was suspended. For more information about the ambient monitoring, parameters,
how data are used for use support assessment and other information, see Chapter 2 of the Supplemental
Guide to North Carolina’s Basinwide Planning.
Long Term Ambient Monitoring
The following discussion of ambient monitoring parameters of concern include graphs showing the median
and mean concentration values for each ambient station in this subbasin by specific parameter over a 13 year
period (1997-2009). The geometric mean is a type of mean or average, which indicates the central tendency
or typical value of a set of numbers. The graphs are not intended to provide statistically significant trend
information, but rather an idea of how changes in land use or climate conditions can affect parameter readings
over the long term. The difference between median and mean results indicate the presence of outliers in the
data set. Box and whisker plots of individual ambient stations were completed by parameter for data between
2005 and 2009 by DWQ’s Environmental Sciences Section (ESS) and can be found in the Roanoke River
Basin Ambient Monitoring System Report.
pH
Figure 2-10 shows the mean and median pH levels for all samples taken over the course of 13 years in the
Lower Dan River Subbasin. Station N4250000 had two percent of samples exceeding the low pH standard of
6.0 as shown by the yellow dot in Figure 2-9. The pH levels in this subbasin remain mostly stable throughout
this time frame.
FiguRe 2-9: PeRCentage oF samPLes
exCeeDing tHe PH stanDaRDs
(2005-2009)
0%
<7%
7%-10%
>10%
FiguRe 2-10: summaRizeD PH vaLues FoR aLL Data CoLLeCteD at
amBient samPLing stations in HuC 03010104
6
6.5
7
7.5
8
8.5
9
pH
Median Mean
* NC pH Standard: Between 6.0 and 9.0 su
Turbidity
Two of the four AMS stations in the Lower Dan River subbasin exceeded the state’s turbidity standard in 5
to 16 percent of samples, as seen in Figure 2-11 indicated by yellow and red dots. Possible sources of the
elevated turbidity levels are discussed in the 10-digit watershed section. Figure 2-12 shows the mean and
median turbidity levels for all samples taken over the course of 13 years in the Lower Dan River subbasin. The
yearly averages are well below the state standard of 50 NTUs.
While some erosion is a natural phenomenon, human land use practices may accelerate the process to
unhealthy levels for aquatic life. Construction sites, mining operations, agricultural operations, logging
operations and excessive stormwater flow off impervious surfaces are all potential sources. Turbidity
exceedances demonstrate the importance of protecting and conserving stream buffers and natural areas.
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2.7
FiguRe 2-11: PeRCentage oF
samPLes exCeeDing tHe tuRBiDitY
stanDaRD (2005-2009)
0%
<7%
7%-10%
>10%
FiguRe 2-12: summaRizeD tuRBiDitY vaLues FoR aLL Data CoLLeCteD at
amBient samPLing stations in HuC 03010104
0
5
10
15
20
25
30
Tu
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(
N
T
U
)
Median Mean
* NC Turbidity Standard: 50 NUT
Dissolved Oxygen (DO)
As seen in Figure 2-13, none of the four sites recorded DO standard exceedance during this monitoring cycle.
Figure 2-14 shows the mean and median of DO levels for all samples taken over the course of 13 years in the
Lower Dan River subbasin. These averages are well within the normal DO range.
FiguRe 2-13: PeRCentage oF
samPLes exCeeDing tHe Do
stanDaRD (2005-2009)
0%
<7%
7%-10%
>10%
FiguRe 2-14: summaRizeD Do vaLues FoR aLL Data CoLLeCteD at
amBient samPLing stations in HuC 03010104
0
2
4
6
8
10
12
14
DO

(
m
g
/
l
)
Median Mean
* NC DO Standard: Not < 5 mg/l daily avg. or not < 4 mg/l instantaneous
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2.8
Fecal Coliform Bacteria
Fecal coliform bacteria (FCB) occurs in water as a result of nonpoint
sources such as animal waste from wildlife, farm animals and/or
pets, as well as from sanitary sewer overflows (SSOs). The FCB
standard for freshwater streams is not to exceed the geometric mean
of 200 colonies/100 ml, or 400 colonies/100 ml in 20% of the samples
where five samples have been taken in a span of 30 days (5-in-30).
Only results from a 5-in-30 study are used to indicate whether the
stream is Impaired or Supporting. Waters with a use classification
of B (primary recreational waters) receive priority for 5-in-30 studies.
Other waters are studied as resources permit.
As seen in Figure 2-15, two of the four sites had between 6.9% and 20% of samples over 400 colonies/100 ml.
Possible sources of elevated levels of FCB are discussed in the subwatershed sections. Figure 2-16 shows
the yearly geometric mean (calculated average) for all samples taken over the course of 13 years in the Lower
Dan River subbasin. The highest yearly geometric mean was recorded in 2001 (56 colonies/100 ml). The
figure also includes the yearly average stream flow, as seen in Figure 2-2, to show how flow can be closely
linked to FCB levels.
FiguRe 2-16: summaRizeD FeCaL CoLiFoRm BaCteRia vaLues FoR aLL Data CoLLeCteD at
amBient samPLing stations in HuC 03010104 witH oveRLaYing FLow
0
10
20
30
40
50
60
FC
B

(
c
o
l
o
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s
/
1
0
0
m
l
)
Geometricmean
0
50
100
150
200
250
300
350
400
450
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2077200 02077303 02077670
0
50
100
150
200
250
300
350
400
450
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2077200 02077303 02077670USGS Flow Gage Stations:
0
50
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200
250
300
350
400
450
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2077200 02077303 02077670
0
200
400
600
800
1000
1200
1400
1600
1800
2000
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2068500207050020710002074000
* NC FCB Standard (5-in-30 data only): Geomean not > 200/100 ml or 400/100 ml in 20% of samples
Additional information about possible causes of parameters discussed above for particular stations, see the
stream write ups below. For more information regarding any of the parameters listed above, see Section
3.3 of the Supplemental Guide to North Carolina’s Basinwide Planning. For additional information about
ambient monitoring data collected in this river basin, see the Roanoke River Basin Ambient Monitoring
System Report.
FiguRe 2-15: PeRCentage oF samPLes
witH eLevateD FCB LeveLs (2005-
2009)
<6.9%
6.9%-10%
10.1%-20.0%
>20.0%
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2.9
underStandinG the data
Biological & Ambient Ratings Converted to Use Support Categories
Biological (benthic and fish community) samples are given a
bioclassification/rating based on the data collected at the site
by DWQs Environmental Sciences Section (ESS). These
bioclassifications include Excellent, Good, Good-Fair, Not
Impaired, Not Rated, Fair and Poor. For specific methodology
defining how these rating are given see Benthic Standard
Operating Procedures (SOP) or the Fish Community SOP.
Once a rating is given, it is then translated into a Use Support
Category (see Figure 2-17).
Ambient monitoring data are analyzed based on the percent of
samples exceeding the state standard for individual parameters
for each site within a five year period. In general, if a standard is
exceeded in greater than 10.0% of samples taken for a particular
parameter, that stream segment is Impaired for that parameter.
The fecal coliform bacteria parameter is exception to the rule. See the Fecal Coliform Bacteria
section in the Ambient Data portion below.
Each biological parameter (benthic and fish community)
and each ambient parameter is assigned a Use Support
Category based on its rating or percent exceedance. A
detailed description of each category can be found on the first
page of Appendix 2-A. Each monitored stream segment is
given an overall category number which reflects the highest
individual parameter category. Figure 2-18 shows how the
category number is translated into the use support rating.
Example
Stream A had a benthic sample that rated Good-Fair and
12% of turbidity samples taken at the ambient station were exceeding the standard. The benthic
sample would be given an individual category number of 1 (Figure 2-17) and the turbidity parameter
would be given a category number of 5 since >10% of samples exceeded the standard. Therefore,
stream A’s overall category number would be a 5, indicating the stream has a use support rating of
Impaired.
FiguRe 2-17: use suPPoRt
CategoRies FoR BioLogiCaL Ratings
Biological
Ratings
Aquatic Life
Use Support
Excellent
Supporting
(Categories 1-2)
Good
Good-Fair
Not Impaired
Not Rated Not Rated(Category 3)
Fair Impaired
(Categories 4-5)Poor
FiguRe 2-18: CategoRY numBeR to
use suPPoRt Rating
CategoRY #use suPPoRt Rating
1 Supporting2
3 Not Rated
4 Impaired5
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2.10
recoMMendationS & action planS at the SubbaSin Scale
dWQ priority SuMMary
Table 2-1 is a list of waters in the Middle Roanoke River Subbasin that DWQ has prioritized for restoration/
protection. The order of priority is not based solely on the severity of the steam’s impairment or impacts but
rather by the need for particular actions to be taken. A stream that is currently supporting its designated uses
may be prioritized higher within this table than a stream that is currently impaired. This is based on a more
holistic evaluation of the drainage area which includes monitoring results, current and needed restoration/
protection efforts, land use and other activities that could potentially impact water quality in the area. Some
supporting streams may have a more urgent need for protections than an impaired stream with restoration
needs already being implemented.
The table also lists potential stressors and sources that may be impacting a stream including in-field
observations, monitoring data, historical evidence and permit or other violations. Additional study may be
needed to determine exact source(s) of the impact. The last column includes a list of recommended actions.
taBLe 2-1: notaBLe wateRs in tHe LoweR Dan RiveR suBBasin (not RankeD)
stReam name au#CLass.PotentiaL
stRessoR(s)
PotentiaL
souRCe(s)
QuaLitative
status
aCtions
neeDeD
Country Line Cr
(Farmer Lake)
22-56-(3.5)a,
(3.5b) &(3.7)
WS-II;
HQW,CA
Low DO, Nutrients,
Turbidity
--Impaired SS
Hyco Lake 22-58-(0.5)WS-V;B Chlorophyll a, Low pH,
Low DO
--Supporting SS
Marlowe Cr 22-58-12-6a & b C Habitat Degradation, Copper ,Zinc Urban Runoff Impaired SC, E, RBR
Mayo Cr
(Mayo Reservoir)
22-58-15-(0.5)WS-V TSS --Supporting SS
Class.: Classification (e.g., C, B, WS-I, WS-II, WS-III, WS-IV, WS-V, Tr, HQW, ORW, SW, UWL)
Stressor: Chemical parameters or physical conditions that at certain levels prevent waterbodies from meeting the standards for their designated use (e.g., low/high DO, nutrients, toxicity, habitat degradation, etc.). Fecal Coliform Bacteria (FCB),
Source: The cause of the stressor. (Volume & Velocity: when a stream receives stormwater runoff at a much higher volume and velocity than it
would naturally receive due to ditching, impervious surfaces, etc.)
Status: Impaired, Impacted, Supporting, Improving (For current Use Support Assessment see the Integrated Report.)
Actions Needed: Agriculture BMPs (Ag), Best Management Practices (BMPs), Daylight Stream (DS), Education (E), Forestry BMPs (F), Local
Ordinance (LO), Monitoring (M), Nutrient Mgnt Controls (NMC), Protection (P), Restoration (R), Riparian Buffer Restoration (RBR), Stormwater Controls (SC), Sediment and Erosion Control BMPs (SEC BMPs), Species Protection Plan (SPP), Stressor Study (SS), .
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StatuS & recoMMendationS For Monitored WaterS
underStandinG thiS Section
In this Section, more detailed information about stream health, special studies, aquatic life stressors
and sources and other additional information is provided by each 10-digit Hydrological Unit Code
(HUC). Waterbodies discussed in this Chapter include all monitored streams, whether monitored
by DWQ or local agencies with approved methods. Use Support information on all monitored
streams within this watershed can be seen on the map in Figure 2-1, and a Use Support list of all
monitored waters in this basin can be found in the Use Support Chapter.
Use Support & Monitoring Box:
Each waterbody discussed in the Status & Recommendations for
Monitored Waters within this Watershed section has a corresponding
Use Support and Monitoring Box (Table 2-2). The top row indicates
the 2010 Use Support and the length of that stream or stream
segment. The next two rows indicate the overall Integrated Report
category which further defines the Use Support for both the 2008
and the 2010 reports. These first three rows are consistent for all
boxes in this Plan. The rows following are based on what type of
monitoring stations are found on that stream or stream segment
and may include benthic, fish community and/or ambient monitoring
data. If one of these three types of monitoring sites is not shown,
then that stream is not sampled for that type of data. The first column
indicates the type of sampling in bold (e.g., Benthos) with the site
ID below in parenthesis (e.g., CB79). The latest monitoring result/rating of that site is listed in the
next column followed by the year that sample was taken. If there is more than one benthic site, for
example, on that stream, the second site ID and site rating will be listed below the first. The last
row in the sample box in Table 2-2 is the AMS data. The data window for all AMS sites listed in the
boxes in this Plan is between 2004-2008. Only parameters exceeding the given standard are listed
in the second column with the percent of exceedance listed beside each parameter.
Please note any fecal coliform bacteria (FCB) listing in the last row (as seen in Table 2-2) only
indicates elevated levels and a study of five samples in 30 days (5-in-30) must be conducted
before a stream becomes Impaired for FCB.
taBLe 2-2: examPLe oF a use
suPPoRt anD monitoRing Box
use suPPoRt: iMpaired (14 mi)
2008 IR Cat.4a
2010 IR Cat.4
Benthos (CB79)
(CB80)
Fair (2002)
Fair (2002)
Fish Com
(CF33)Good-Fair (2002)
AMS
(C1750000)
Turbidity - 12%
FCB - 48%
hoGanS creek-dan river (0301010401)
Includes: Dan River [AU#: 22-(39)b], Jones Creek [AU#: 22-50-3],
Hogans Creek [AU#: 22-50], Moon Creek [AU#: 22-51], Rattlesnake
Creek [AU#: 22-52] & Cane Creek [AU#: 22-54]
This watershed contains a mixed land use of agriculture, forest and residential areas.
There are 12 minor NPDES permitted facilities and three permitted animal operations
located within the watershed. There is one stream (Dan River) on the 2010 Impaired
Waters List in this watershed.
Dan River [AU#: 22-(39)b]
This is the last segment of the Dan River within NC and is approximately ten
miles from state line to state line. Land cover for this drainage area is mostly
agriculture with some forested and residential areas.
use suPPoRt: iMpaired (9.6 mi)
2008 IR Cat.5
2010 IR Cat.5
Benthos (NB22)Good (1999)
AMS
(N3500000)
Turbidity (22.8%)
FCB (22.8%)
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Water quality status of this segment of the Dan River and other information about the full length of the river is
discussed in the Dan River Impairment Summary section in Chapter 1.
country line creek (0301010402)
Includes: Country Line Creek [AU#: 22-56-(1), (3.5)a, (3.5)b & (3.7)]
This watershed contains a mixed land use of agriculture, forest and residential areas.
There are three minor NPDES permitted facilities and one permitted swine animal
operation located within the watershed. There is one stream (Country Line Creek) on
the 2010 Impaired Waters List in this watershed.
Country Line Creek (Farmer Lake) [AU#: 22-56-(3.5)a, (3.5)b & (3.7)]
Farmer Lake is approximately 91 acres in size. The majority of the drainage
area is forest, agriculture and some residential. The lake is a water supply
reservoir for the City of Yanceyville and is classified as a WS-II, HQW, CA.
Only the upstream segment of this lake is on the 2010 Impaired Waters List.
Water Quality Status
Lake station samples were taken in 2007 and 2009 during the summer months
on Farmer Lake. Samples showed poor water clarity, thermally stratified waters,
low DO levels and high biological productivity. Ammonia and nitrite plus nitrate
concentration were low; however, total phosphorus and TKN levels were elevated. Four out of the 34 samples
taken between the two years were exceeding the chlorophyll a state standard. All exceeding samples were
found in the Impaired segment of the lake (ROA027G). Turbidity levels at this station were also exceeding the
state standard by 33%. See Figure 2-1 for station locations.
Recommendations
A source study in this drainage area could determine the source of nutrients.
hyco lake (0301010405)
Includes: Hyco Creek [AU#: 22-58-1], South Hyco Creek (Lake
Roxboro) [AU#: 22-58-4-(0.5), (1.7) & (3)], & Hyco Lake [AU#: 22-58-(0.5)]
This watershed contains a mixed land use of agriculture, forest and residential areas.
There are 39 minor and one major NPDES permitted facilities and four permitted
animal operation located within the watershed. There is one stream (Country Line
Creek) on the 2010 Impaired Waters List in this watershed.
Hyco Lake [AU#: 22-58-(0.5)]
Hyco Lake is located on the Hyco River approximately three miles south of the
North Carolina-Virginia State line in Person and Caswell Counties. Land cover
around the lake is a mixture of forest residential and agriculture. The lake was
previously on the Impaired Waters List due to a NC DHHS fish consumption
advisory-selenium. The advisory was lifted, removing the lake from the Impaired
Waters List. This lake is currently supporting all designated uses.
Water Quality Status
There are four lake monitoring stations scattered throughout Hyco Lake. These
stations were monitored between May and September 2009. Nutrient levels within the lake have historically
measured at low to moderate levels. Results from this cycle indicate the lake remains at low to moderate
nutrient and biological productivity levels. However, there is a moderate increase in chlorophyll a levels when
use suPPoRt: iMpaired
(90.7 aC)
2008 IR Cat.2
2010 IR Cat.5
Lake Station
(ROA027G)
(ROA027J) (ROA027L)
Chlorophyll a,
Turbidity
use suPPoRt: SupportinG (4,298 aC)
2008 IR Cat.5
2010 IR Cat.2
Lake Stations (ROA030E)
(ROA030C)
(ROA030F)
(ROA030G)
No
Exceedances
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evaluating samples between 1994 - 2009. Long term monitoring results also show a decrease in pH and a
steady decrease in DO levels. Specific conductivity averages almost doubled between the current and past
sampling cycle.
In 2008, Progress Energy notified the Raleigh Regional Office (RRO) of DWQ that the FGD wastewater settling
basin was seeping and at risk of failure. To reduce this risk, Progress Energy dewatered the settling basin
into the adjacent ash pond to reduce the hydraulic head in the settling basin. On February 27, 2008, Progress
Energy notified RRO staff that an 8 to 12 foot wide berm failure had occurred on the flush pond berm, allowing
water from the pond to discharge into the adjacent Ash Pond. According to Progress Energy, at the time of the
berm failure, the flush pond only contained start up water and not backwash water from the FGD Bioreactor.
The RRO requested Progress Energy to conduct additional sampling of both lake surface water and adjacent
ground water in an effort to determine changes or effects of the waste streams as a result of the treatment
unit failure, bypass and changes in the treatment capacities of the settling basin. This sampling effort was
conducted eight times in March and April. Data from this monitoring effort revealed elevated levels of thallium,
selenium, copper, beryllium, silver, mercury and antimony in the effluent stream from outfall 003 in Hyco Lake
and from a non-potable well located within 500 feet of the FGD Settling Pond and the FGD Flush Pond.
At the request of the Raleigh Regional Office, staff from DWQ’s Intensive Survey Unit collected water and
sediment samples on July 21, 2008 from various lake sites near the FGD wastewater treatment system along
with two additional sites located upstream and downstream of the facility. Results of this sampling indicated
that elevated metals detected by Progress Energy in the spring were now at very low levels or below DWQ
laboratory detection levels. Thallium was present in the sediment samples along with vanadium and selenium,
however, water samples collected near the bottom of the reservoir at the three sediment sampling sites exhibited
concentrations of these metals below the DWQ laboratory’s detection levels. Physical measurements taken at
each sampling site were similar to those observed in the past with the exception of conductivity values, which
were the greatest recorded by DWQ staff since 1983 when this reservoir was first monitored.
For more information about this and additional monitoring see the Roanoke River Basin Lake and Reservoir
Assessment Report.
hyco river (0301010406)
Includes: Hyco River [AU#: 22-58-(9.5)], Marlowe Creek [AU#: 22-
58-12-6a & b], & Mayo Creek (Mayo Reservoir) [AU#: 22-58-15-(0.5)]
This watershed contains a mixed land use of agriculture, forest, urban and residential
areas. There are five minor and two major NPDES permitted facilities and two
permitted swine animal operation located within the watershed. There is one stream
(Marlowe Creek) on the 2010 Impaired Waters List in this watershed.
Marlowe Creek [AU#: 22-58-12-6a & b]
Marlowe Creek is split into two segments and is approximately 11 miles from
source to Storys Creek which flows into Hyco River [AU#: 22-58-(9.5)]. The
Town of Roxboro is located in the headwaters of Marlowe Creek. Further
downstream, the land use is mostly forest and agriculture. Marlowe Creek has
been on the Impaired Waters List since 1998.
Water Quality Status
Marlowe Creek was sampled twice for biological health during this cycle.
The first sample was taken in 2006 as part of a Small Stream Biocriteria
Development study near the intersection of N. Main Street and NC-49 in
Roxboro. The sample showed the creeks aquatic life was severely impacted
by the highly urbanized area and had poor habitat (scored a 39 out of 100).
use suPPoRt: iMpaired
(11.1 mi)
2008 IR Cat.5
2010 IR Cat.5
Benthos
(NB43)
(NB85)
(NB119)
Fair (2009)
Fair (2004)
Not Rated (2006)
Fish Com
(NF27)Good-Fair (2004)
AMS (N4400000)Copper (22.2%)Zinc (44.4%)
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The second sample (NB43) was taken further downstream near the confluence of Fishing Creek. This site
has been sampled since 1994 when it received a Poor rating. Each sample increased in rating following the
1994 sample up to a Good-Fair in 2004. This water quality improvement was contributed to significant facility
upgrades at the Roxboro WWTP. The 2009 sample dropped back to a Fair rating and reflected water quality
similar to what was seen in 1999. The WWTP however, had only a few minor permit violations and only failed
one toxicity test.
An Ambient Monitoring Station is also located near the confluence of Fishing Creek. DO and turbidity levels
have improved as compared to the last cycle (1999-2003). Fecal coliform bacteria levels have also improved.
The geometric mean was three time lower than the previous cycle. However, copper and zinc levels remain
elevated above the state standards.
Marlowe Creek will remain on the Impaired waters list for both biological impairments as well as for copper
and zinc exceedances.
Local Initiatives
The City of Roxboro was designated as a Phase II community as of January 2010 which require additional
stormwater BMPs. This will assist in reducing the urban runoff impacting the stream.
Mayo Creek (Mayo Reservoir) [AU#: 22-58-15-(0.5)]
The Mayo Reservoir is roughly 2,613 acres and is owned by Progress Energy.
The majority of the drainage area is agriculture, forest and residential.
Water Quality Status
Surface physical parameters (DO, pH and water temperature) in 2009 were
similar to those values observed in this reservoir since it was first monitored by
DWQ in 1983. Conductivity values, however, were greater in 2009 (range =
111 to 166 µmhos/cm). Total solids were also greater in 2009 than in previous
years (range = 80 to 130 mg/L) while values for turbidity and total solids remained the same. Nutrient levels
and chlorophyll a levels were all low. The lake was determined to be mesotrophic, or having moderate
biological productivity, in 2009.
Progress Energy Mayo Steam Electric Power Plan (NC0038377)
CP&L DBA Progress Energy Carolinas, Inc. operates a steam electric power plant facility and holds an NPDES
permit NC0038377 to discharge process control and industrial waste streams to Mayo Lake a Class WS-V
water, in the Roanoke River Basin, in Person County.
Progress Energy Carolinas, Inc. installed wet limestone forced oxidation wet scrubbers on all operating units
at the Mayo Steam Electric Plant in response to requirements from the State of North Carolina under the Clean
Smokestacks legislation. Accordingly, Progress Energy installed a Flue Gas Desulfurization (FGD) wastewater
settling pond, a General Electric ABMet bioreactor (a new technology biological treatment system), and a flush
pond to treat wastewater generated by the recently added wet scrubbers.
Since installation of FGD settling basin, FGD flush pond and GE ABMet bioreactor Progress Energy Carolinas,
Inc. has:
£upgraded ash handling system to handle all fly ash at the plant as dry ash to reduce pollutant loading to
the outfall.
£installed and uses the addition of a MetClear injection system to aid in the settling of mercury and other
constituents in the settling pond.
£added a pH adjustment system to the inlet of the bioreactor to aid in keeping the pH of the wastewater at
an optimum level for maximum treatment efficiency.
£placed into service secondary hydrocyclones to reduce the amount of suspended solids in the blowdown
to the settling pond.
use suPPoRt: SupportinG (2,613 aC)
2008 IR Cat.2
2010 IR Cat.2
Lake Stations (ROA0343A)
(ROA0342A)
(ROA0341A)
No
Exceedances
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However, effluent sampling results reported by Progress Energy from the NPDES Outfall 002 has revealed
effluent limit exceedances. On December 9, 2010, Progress Energy provided DWQ an Application for a
Special Order by Consent, whereby a schedule may be developed for additional treatment unit(s) and/or
alternative treatment technology construction.
aaronS creek-dan river (0301010407)
Includes: Crooked Fork [AU#: 22-59-1], & Aarons Creek [AU#: 22-
59]
This watershed contains a mixed land use of agriculture, forest and residential
areas. There are no permitted facilities located within the watershed. There are no
streams on the 2010 Impaired Waters List in this watershed.
reFerenceS
References marked with (*) indicates a DWQ special study report. These reports are not currently available
online. Contact the DWQ Environmental Science Section at [phone] to receive a hardcopy.
North Carolina Department of Environment and Natural Resources (NCDENR). Division of Water Quality
(DWQ). August 2004a. Classifications and Water Quality Standards Applicable to Surface Waters and
Wetlands of North Carolina. North Carolina Administrative Code: 15A NCA 2B. Raleigh, NC. (http://
h2o.enr.state.nc.us/csu/)
____. DWQ. Planning Section. Basinwide Planning Unit (BPU). November 2008. Supplemental Guide to
Basinwide Planning: A support document for basinwide water quality plans. Raleigh, NC. (http://por-
tal.ncdenr.org/web/wq/ps/bpu/about/supplementalguide)
____. DWQ. Environmental Sciences Section (ESS). Ecosystems Unit. September 2010. Roanoke River
Basin Ambient Monitoring Systems Report (January 1, 2005 through December 31, 2009). Raleigh,
NC. (http://portal.ncdenr.org/c/document_library/get_file?uuid=c9a59811-634c-490b-b566-
6a8ebc00554d&groupId=38364)
____. DWQ. Environmental Sciences Section (ESS). Biological Assessment Unit (BAU). December 2010.
Basinwide Assessment Report: Roanoke River Basin. Raleigh, NC. (http://portal.ncdenr.org/c/doc-
ument_library/get_file?uuid=e3dd1d8b-bbc5-42c9-9999-1d99dd4c7455&groupId=38364)
____. DWQ. ESS. BAU. May 2009. Small Stream Biocriteria Development. Raleigh, NC. (http://www.esb.
enr.state.nc.us/documents/SmallStreamsFinal.pdf)
____. DWQ. ESS. BAU. March 2010. Lake & Reservoir Assessments Roanoke River Basin. Raleigh, NC.
Pate, Travis. 2009. Watershed Assessment in North Carolina: Building a Watershed Database with Popula-
tion, Land Cover, and Impervious Cover Information. Master Theses, University of North Carolina at
Chapel Hill.
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2-A.1
DRaFt 2010
iR CategoRY
integRateD RePoRting CategoRies FoR inDiviDuaL assessment unit/use suPPoRt CategoRY/
PaRameteR assessments. a singLe au Can Have muLtiPLe assessments DePenDing on Data
avaiLaBLe anD CLassiFieD uses.
1 All designated uses are monitored and supporting
1b Designated use was impaired, other management strategy in place and no standards violations for the parameter of interest (POI)
1nc DWQ have made field determination that parameter in exceedance is due to natural conditions
1r Assessed as supporting watershed is in restoration effort status
1t No criteria exceeded but approved TMDL for parameter of interest
2 Some designated uses are monitored and supporting none are impaired Overall only
2b Designated use was impaired other management strategy in place and no standards violations Overall
only
2r Assessed as supporting watershed is in restoration effort status overall only
2t No criteria exceeded but approved TMDL for POI Overall only
3a Instream/monitoring data are inconclusive (DI)
3b No Data available for assessment
3c No data or information to make assessment
3n1 Chlorophyll a exceeds TL value and SAC is met-draft
3n2 Chlorophyll a exceeds EL value and SAC is not met first priority for further monitoring-draft
3n3 Chlorophyll a exceeds threshold value and SAC is not met first second priority for further monitoring-draft
3n4 Chlorophyll a not available determine need to collect-draft
3t No Data available for assessment –AU is in a watershed with an approved TMDL
4b Designated use impaired other management strategy expected to address impairment
4c Designated use impaired by something other than pollutant
4cr Recreation use impaired no instream monitoring data or screening criteria exceeded
4cs Shellfish harvesting impaired no instream monitoring data- no longer used
4ct Designated use impaired but water is subject to approved TMDL or under TMDL development
4s Impaired Aquatic Life with approved TMDL for Aquatic Life POI or category 5 listing
4t Designated use impaired approved TMDL
5 Designated use impaired because of biological or ambient water quality standards violations and needing
a TMDL
5r Assessed as impaired watershed is in restoration effort status
appendix 2-a
use suPPoRt Ratings FoR aLL
monitoReD wateRs in tHe
LoweR Dan RiveR suBBasin
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a
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2-A.2
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2-A.3

AU_NameAU_Number AU_Description LengthArea AU_Units Classification
All 13,123 Waters in NC are in Category 5-303(d) List for Mercury due to statewide fish consumption advice for several fish species

NC 2010 Integrated Report

Hogans Creek-Dan River 0301010401Roanoke River Basin Watershed
Dan River 03010104Roanoke River Basin Subbasin
Hogans Creek-Dan River 0301010401Roanoke River Basin Watershed
Cane Creek22-54 From North Carolina-Virginia State Line to
Dan River
0.8 FW Miles C
 1
DAN RIVER (North
Carolina portion)
22-(39)b From NC/VA crossing downstream of Wolf
Island Creek to last crossing of North
Carolina-Virginia State Line
9.6 FW Miles C
 4t
 5
Hogans Creek22-50 From source to Dan River 29.1 FW Miles C
 1
Jones Creek (Lake
Wade)
22-50-3 From source to Hogans Creek 7.6 FW Miles C
 1
Moon Creek
(Wildwood Lake)
22-51 From source to Dan River 17.0 FW Miles C
 1
Rattlesnake Creek22-52 From source to Dan River 2.7 FW Miles C
 1
Country Line Creek 0301010402Roanoke River Basin Watershed
Country Line Creek22-56-(1)From source to a point 0.5 mile upstream
of mouth of Nats Fork
10.5 FW Miles WS-II;HQW
 1
Country Line Creek22-56-(3.7)From dam at Farmer Lake to Dan River 24.5 FW Miles C
 1
Country Line Creek
(Farmers Lake)
22-56-(3.5)a Upper reservoir- From a point 0.5 mile
upstream of mouth Nats Fork to dam at
Farmer Lake (Town of Yanceyville water
supply intake located 1.8 mile upstream of
N.C. Hwy. 62)
90.7 FW Acres WS-
II;HQW,CA
 5
 5
 1
10/20/2010 Page 228 of 372NC 2010 Integrated Report 5-303(d) List EPA Approved Aug 31, 2010
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AU_NameAU_Number AU_Description LengthArea AU_Units Classification
All 13,123 Waters in NC are in Category 5-303(d) List for Mercury due to statewide fish consumption advice for several fish species

NC 2010 Integrated Report

Country Line Creek 0301010402Roanoke River Basin Watershed
Country Line Creek
(Farmers Lake)
22-56-(3.5)b Lower reservoir-From a point 0.5 mile
upstream of mouth Nats Fork to dam at
Farmer Lake (Town of Yanceyville water
supply intake located 1.8 mile upstream of
N.C. Hwy. 62)
271.1 FW Acres WS-
II;HQW,CA
 1
 1
Hyco Lake 0301010405Roanoke River Basin Watershed
Hyco Creek (North
Hyco Creek)
22-58-1 From source to Hyco Lake, Hyco River 16.8 FW Miles C
 3a
Hyco River, including
Hyco Lake below
elevation 410
22-58-(0.5)From source in Hyco Lake to dam of Hyco
Lake, including tributary arms below
elevation 410
4,297.9 FW Acres WS-V,B
 1
 1
South Hyco Creek22-58-4-(3)From a point 0.6 mile downstream of
Double Creek to Hyco Lake, Hyco River (City
of Roxboro water supply intake)
0.7 FW Miles WS-
II;HQW,CA
 1
South Hyco Creek
(Lake Roxboro)
22-58-4-(1.4)From backwaters of Lake Roxboro to dam
at Lake Roxboro
493.6 FW Acres WS-II,B;HQW
 3n
 1
Hyco River 0301010406Roanoke River Basin Watershed
Hyco River22-58-(9.5)From dam of Hyco Lake to North Carolina-
Virginia State Line, including all portions in
North Carolina
6.8 FW Miles C
 1
 1
Marlowe Creek22-58-12-6a From source to Mitchell Creek 6.6 FW Miles C
  5
10/20/2010 Page 229 of 372NC 2010 Integrated Report 5-303(d) List EPA Approved Aug 31, 2010
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AU_NameAU_Number AU_Description LengthArea AU_Units Classification
All 13,123 Waters in NC are in Category 5-303(d) List for Mercury due to statewide fish consumption advice for several fish species

NC 2010 Integrated Report

Hyco River 0301010406Roanoke River Basin Watershed
Marlowe Creek22-58-12-6b From Mithcell Creek to Storys Creek 4.5 FW Miles C
 5
 1
 1
 1
 5
Mayo Creek (Maho
Creek)
22-58-15-(3.5)From dam of Mayo Reservoir to North
Carolina-Virginia State Line
0.5 FW Miles C
 1
 1
Mayo Creek (Maho
Creek) (Mayo
Reservoir)
22-58-15-(0.5)From source to dam of Mayo Reservoir 2,613.8 FW Acres WS-V
 1
 1
Storys Creek
[Roxboro City Lake
(Lake Issac Walton)]
22-58-12-(1.5)From a point 0.9 mile downstream of N.C.
Hwy. 57 to Roxboro City Lake Dam
189.5 FW Acres WS-
II;HQW,CA
 1
Aarons Creek-Dan River 0301010407Roanoke River Basin Watershed
Aarons Creek22-59 From source to North Carolina-Virginia
State Line
8.6 FW Miles C
 1
10/20/2010 Page 230 of 372NC 2010 Integrated Report 5-303(d) List EPA Approved Aug 31, 2010
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2-B.1
appendix 2-b
BioLogiCaL samPLing site Data sHeets
(BentHiC maCRoinveRteBRate & FisH CommunitY)
FoR tHe LoweR Dan RiveR suBBasin
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2-B.2
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2-B.3
Biological Samples Taken During this Assessment Cycle
station iD wateRBoDY CountY site LoCation samPLe ResuLts
Benthic Sample Sites
NB112 CROOKED FK PERSON SR 1558 06 - Not Impaired
NB116 NEGRO CR CASWELL SR 1769 06 - Not Impaired
NB118 TANYARD BR PERSON US 501 06 - Not Rated
NB119 MARLOWE CR PERSON NC 49 06 - Not Rated
NB40 COUNTRY LINE CR CASWELL NC 57 09 - Excellent
NB43 MARLOWE CR PERSON SR 1322 09 - Fair
Fish Community Sample Sites
NF15 Hogans Cr Caswell SR 1330 09 - Good-Fair
NF24 Moon Cr Caswell SR 1511 09 - Good
NF26 Rattlesnake Cr Caswell SR 1523 09 - Good
NF30 S Hyco Cr Person US 158 09 - Fair
NF31 Aarons Cr Granville SR 1400 09 - Good
NF35 Hogans Cr Caswell SR 1301 09 - Good-Fair
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2-B.4
Water Quality Parameters
Temperature (°C)
Dissolved Oxygen (mg/L)
Specific Conductance (µS/cm)
pH (s.u.)
Water Clarity
Channel Modification (5)
Instream Habitat (20)
Bottom Substrate (15)
Pool Variety (10)
Riffle Habitat (16)
Erosion (7)
Bank Vegetation (7)
Light Penetration (10)
Left Riparian Score (5)
Right Riparian Score (5)
Total Habitat Score (100)
Species Change Since Last Cycle
Waterbody
HOGANS CR
AU Number
22-50
County
CASWELL
Latitude
36.439045
Good-Fair
Bioclassification
Level IV Ecoregion
Northern Inner Piedmont
Longitude
-79.515205
07/06/09
Date
NF35
Station ID
Site Photograph
Forested/Wetland
00
0.3
Agriculture Other (describe)
No
NPDES Number
Reference Site
This is the first fish community sample collected from this 2009-2010 Random Ambient Monitoring site. Watershed -- drains primarily eastern Rockingham
County, including a portion of the Town of Reidsville; two small NPDES facilities located in the headwaters (NC0002828 and NC0077135, total Qw= 0.027
MGD); tributary to the Dan River. Habitats -- snags, stick riffles, gravel bars, deadfalls, and shallow runs; high quality bank and riparian characteristics, but
stream still exhibits impacts such as poor quality riffles and sandy substrate from nonpoint source erosion. 2009 -- all diversity metrics (total species
diversity and diversities of darters, sunfish, and suckers) were lower than expected; intolerant species were also absent; three species (White Sucker,
Notchlip Redhorse, and Largemouth Bass) were represented only by young-of-year and were excluded from the sample. Long-term nonpoint source
erosion seems to be the primary stressor to this stream.
Rural Residential
0
Volume (MGD)
Data Analysis
Visible Landuse (%)
Sample Date
N/A
07/06/09
Stream Width (m)
8
Average Depth (m)
---
Upstream NPDES Dischargers (>1MGD or <1MGD and within 1 mile)
100
Elevation (ft)
550
Drainage Area (mi2)
65.4
Good-Fair
NCIBI
42
None
Habitat Assessment Scores (max)
20.0
3
5
---
5
9
3
Sample ID
2009-80
6
7
10
7.1
122
6.7
Slightly turbid
5
13
Satinfin Shiner (25%) Most Abundant Species 2009
66 Sand, gravel, block bedrock boulders jutting out from the left bankSubstrate
Exotic Species 2009
Species Total
15
Bluegill
Bioclassification
FISH COMMUNITY SAMPLE
Stream Classification
C
SR 1301
Location
8 digit HUC
03010104
Subbasin
3
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2-B.5
Water Quality Parameters
Temperature (°C)
Dissolved Oxygen (mg/L)
Specific Conductance (µS/cm)
pH (s.u.)
Water Clarity
Channel Modification (5)
Instream Habitat (20)
Bottom Substrate (15)
Pool Variety (10)
Riffle Habitat (16)
Erosion (7)
Bank Vegetation (7)
Light Penetration (10)
Left Riparian Score (5)
Right Riparian Score (5)
Total Habitat Score (100)
County
CASWELL
Good-Fair
Bioclassification
Level IV EcoregionLongitude
-79.40416667
07/06/09
Date Station ID
Species Change Since Last Cycle
Waterbody
HOGANS CR
AU Number
22-50
No
Reference Site
Subbasin
3
Latitude
36.49027778
Elevation (ft)
8 digit HUC
03010104 Northern Inner Piedmont
07/06/09
NPDES Number
---
Stream Width (m)
11
05/25/04
NF15
Site Photograph
Forested/Wetland
030
0.4
Agriculture Other (describe)
None
Watershed -- drains eastern Rockingham and northwestern Caswell counties, including a portion of the Town of Reidsville; two small NPDES facilities
located in the headwaters (NC0002828 and NC0077135, total Qw = 0.027 MGD); tributary to the Dan River. Habitats -- gravelly and sandy runs; good
snag pools, undercuts, Podostemum in the riffles, but stream still exhibits substantial nonpoint source erosion. 2009 -- ~ 2 times as many fish were
collected in 2009 than in 2004 (336 vs. 178), primarily Swallowtail Shiner, Crescent Shiner, and Satinfin Shiner (53% of all the fish collected); the diversities
of sunfish and suckers were much lower than expected; 1 of only 2 sites where suckers were absent, although Notchlip Redhorse were collected they were
represented only by young-of-year and were excluded from the sample; combined with a skewed trophic structure the NCIBI score and rating declined;
despite having a large drainage area the community may still be suffering from drought impacts and from chronic nonpoint source ersoion. 2004 & 2009 --
26 species known from the site, including 6 species of darters; dominant species is the Swallowtail Shiner.
Rural Residential
10
Volume (MGD)
Data Analysis
Visible Landuse (%)
Sample Date
Gains --Rosyside Dace, Crescent Shiner, Glassy Darter, Riverweed Darter. Losses -- White Sucker, Northern
Hogsucker, Notchlip Redhorse, Margined Madtom, Channel Catfish, Green Sunfish, Chainback Darter,
Roanoke Darter. All species gained or lost were represented by 1-3 fish/species, except for Crescent Shiner
(n=37).
40
52
Average Depth (m)
---
Upstream NPDES Dischargers (>1MGD or <1MGD and within 1 mile)
60
20.8
3
Habitat Assessment Scores (max)
410
Drainage Area (mi2)
92.6
5
5
9
Bluegill
Bioclassification
Good-Fair
Good
NCIBI
4
Sample ID
10
7.3
118
6.7
Slightly turbid
5
16
Sand, gravelSubstrate
Exotic Species 2009
Species Total
18
202004-56
2009-81
FISH COMMUNITY SAMPLE
Stream Classification
C
SR 1330
Location
Swallowtail Shiner (28%) Most Abundant Species 2009
69
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2-B.6
Water Quality Parameters
Temperature (°C)
Dissolved Oxygen (mg/L)
Specific Conductance (µS/cm)
pH (s.u.)
Water Clarity
Channel Modification (5)
Instream Habitat (20)
Bottom Substrate (15)
Pool Variety (10)
Riffle Habitat (16)
Erosion (7)
Bank Vegetation (7)
Light Penetration (10)
Left Riparian Score (5)
Right Riparian Score (5)
Total Habitat Score (100)
370
Drainage Area (mi2)
47.2
FISH COMMUNITY SAMPLE
Stream Classification
C
SR 1511
Location
8 digit HUC
03010104
Sand, gravelSubstrate
Species Total
20
16
2009-42
59
09/07/94
2004-32
5
Sample ID
None
Habitat Assessment Scores (max)
15.0
3
Clear
5
8.4
97
6.5
5
6
9
Good
Good
NCIBI
52
46
44 Good-Fair
Average Depth (m)
---
Upstream NPDES Dischargers (>1MGD or <1MGD and within 1 mile)
45
Elevation (ft)
Bioclassification
14
3
3
6
Visible Landuse (%)
Sample Date
Gains -- Eastern Silvery Minnow, Crescent Shiner, Redlip Shiner, Mountain Redbelly Dace, Creek Chub, White
Sucker, Redear Sunfish, Glassy Darter. Losses -- Golden Shiner, Redfin Pickerel, Pumpkinseed, Largemouth
Bass. All species gained or lost were represented by 1- 4 fish/species, except for Redlip Shiner, Eastern
Silvery Minnow, and Crescent Shiner (n=17, 41, and 130, respectively).
05/21/09
04/30/04
Reference Site
NPDES Number
---
Stream Width (m)
8
55
0.4
Agriculture Other (describe)
No
Watershed -- drains northwestern Caswell County; no municipalities with the watershed; tributary to the Dan River, site is ~ 2.2 miles above the creek's
confluence with the river. Habitats -- sandy runs, woody debris, snags, narrow riparian zones intact along both banks, but stream still exhibits substantial
nonpoint source erosion as evident from the low scoring habitat characteristics. 2009 -- 6 times more fish collected in 2009 than in 2004 (627 vs . 104),
especially Crescent Shiner (130 vs. 0), Bluehead Chub (112 vs. 11), and Eastern Silvery Minnow (41 vs . 0); no lingering effects from the drought. 1994 -
2009 -- very diverse fish community, 30 species are known from the site, including 12 species of cyprinids, 5 species of sunfish, and 4 species of darters;
dominant species are variable and include Eastern Silvery Minnow (1994), Satinfin Shiner and Redbreast Sunfish (2004), and Crescent Shiner and
Bluehead Chub (2009); NCIBI score and rating have gradually been improving over the past 15 years.
Rural Residential
0
Volume (MGD)
Data Analysis
Level IV Ecoregion
Northern Inner Piedmont
Longitude
-79.33555556
NF24
94-34 22
Site Photograph
Forested/Wetland
0
Species Change Since Last Cycle
Waterbody
MOON CR
AU Number
22-51
County
CASWELL
Subbasin
4
Latitude
Most Abundant Species 2009 Crescent Shiner (21%), Bluehead Chub
(18%) Exotic Species 2009 Green Sunfish, Bluegill, Redear Sunfish
05/21/09
Date Station ID
36.5075
Good
Bioclassification
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2-B.7
Water Quality Parameters
Temperature (°C)
Dissolved Oxygen (mg/L)
Specific Conductance (µS/cm)
pH (s.u.)
Water Clarity
Channel Modification (5)
Instream Habitat (20)
Bottom Substrate (15)
Pool Variety (10)
Riffle Habitat (16)
Erosion (7)
Bank Vegetation (7)
Light Penetration (10)
Left Riparian Score (5)
Right Riparian Score (5)
Total Habitat Score (100)
County
CASWELL
Good
Bioclassification
Level IV EcoregionLongitude
-79.29333333
05/21/09
Date Station ID
Species Change Since Last Cycle
Waterbody
RATTLESNAKE CR
AU Number
22-52
No
Reference Site
Subbasin
4
Latitude
36.50777778
Elevation (ft)
8 digit HUC
03010104 Northern Inner Piedmont
05/21/09
NPDES Number
---
Stream Width (m)
6
05/25/04
NF26
Site Photograph
Forested/Wetland
00
0.2
Agriculture Other (describe)
None
Watershed -- drains northwestern Caswell County with its headwaters arising in the Town of Yanceyville; tributary to the Dan River, site is ~0.2 miles
above the creek's confluence with the river. Habitats -- very shallow and sandy runs, a couple of large boulder outcrops in the channel, riparian zones
intact providing good shading to the stream; but stream is impacted by very substantial nonpoint source erosion. 2009 -- 5 times more fish collected in
2009 than in 2004 (929 vs. 184), especially Satinfin Shiner, Eastern Silvery Minnow, Swallowtail Shiner, Bluehead Chub, Speckled Killifish, and Rosefin
Shiner (86% of all the fish collected); very high percentage of tolerant fish (53%). 2004 & 2009 -- 25 species known from the site, including 12 species of
cyprinids and 3 species of darters; dominant species is the Satinfin Shiner; very dynamic community, the close proximity to the river may influence the
community (i.e., schooling species such as Eastern Silvery Minnow and Satinfin Shiner migrating back and forth from the creek to the river).
Rural Residential
0
Volume (MGD)
Data Analysis
Visible Landuse (%)
Sample Date
Gains -- Crescent Shiner, Mountain Redbelly Dace, Creek Chub, V-lip Redhorse, Eastern Mosquitofish, Fantail
Darter. Losses -- Golden Shiner, Channel Catfish, Redfin Pickerel, Warmouth. All species gained or lost were
represented by 1-9 fish/species, except for Eastern Mosquitofish and Fantail Darter (n=14 and 17, respectively).
46
48
Average Depth (m)
---
Upstream NPDES Dischargers (>1MGD or <1MGD and within 1 mile)
100
15.1
4
Habitat Assessment Scores (max)
350
Drainage Area (mi2)
23.7
5
5
6
Red Shiner, Green Sunfish, Bluegill
Bioclassification
Good
Good
NCIBI
7
Sample ID
10
8.8
120
6.6
Clear
5
14
SandSubstrate
Exotic Species 2009
Species Total
21
192004-57
2009-43
FISH COMMUNITY SAMPLE
Stream Classification
C
SR 1523
Location
Satinfin Shiner (46%) Most Abundant Species 2009
65
3
6
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2-B.8
Water Quality Parameters
Temperature (°C)23.6
Dissolved Oxygen (mg/L)7.7
Specific Conductance (µS/cm)126
pH (s.u.)6.4
Channel Modification (5)5
Instream Habitat (20)18
Bottom Substrate (15)11
Pool Variety (10)8
Riffle Habitat (16)7
Bank Erosion (7)0
Bank Vegetation (7)5
Light Penetration (10)10
Left Riparian Score (5)4
Right Riparian Score (5)1
Total Habitat Score (100)69
BENTHIC MACROINVERTEBRATE SAMPLE
Waterbody Location Station ID Date Bioclassification
COUNTRY LINE CR NC 57 NB40 08/12/09 Excellent
County Subbasin 8 digit HUC Latitude Longitude AU Number Level IV Ecoregion
CASWELL 4 03010104 36.537778 -79.201111 22-56-(3.7)Northern Inner Piedmont
Stream Classification Drainage Area (mi2)Elevation (ft)Stream Width (m)Stream Depth (m)
C 138.0 395 10 0.1
Forested/Wetland Urban Agriculture Other (describe)
Visible Landuse (%)70 30 0
Site Photograph
Water Clarity slightly turbid
Habitat Assessment Scores (max)
Substrate The channel substrata consisted of mostly sand and gravel.
Upstream NPDES Dischargers (>1MGD or <1MGD and within 1 mile)NPDES Number Volume (MGD)
None ------
Bioclassification
08/12/09 10808 ---28 ---4.31 Excellent
Sample Date Sample ID ST EPT BI EPT BI
Good
08/24/94 6691 ---14 ---4.55 Good-Fair
07/01/04 9400 ---24 ---4.82
Taxonomic Analysis
Several pollution sensitive EPT taxa were collected at this site in 2009 such as the stoneflies Paragnetina fumosa,Pteronarcys spp ., and long-lived
Acroneuria abnormis. Intolerant caddisflies collected included Brachycentrus numerosus ,Nyctiophylax moestus, and Pycnopsyche spp. The mayfly
Plauditus cestus and caddisfly Ceraclea mentiea are listed by the North Carolina Natural Heritage Program as Significantly Rare (2006) and were
collected from this location in 2009.
Data Analysis
This site received a bioclassification of Excellent in 2009 for the first time since sampling began in 1983. Decreases in EPTBI from 4.82 in 2004 to 4.31 in
2009 in addition to the highest EPT taxa richness (28) on record from this location continue to suggest better water quality. Pollution sensitive
macroinvertebrate communities were collected at this site despite evidence of habitat degradation due to increased erosion leading to in-channel
sedimentation, scouring, and increased bar development from nonpoint sources.
Good
07/23/87 4158 ---26 ---5.15 Good
07/10/90 5337 ---26 ---4.53
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2-B.9
Water Quality Parameters
Temperature (°C)
Dissolved Oxygen (mg/L)
Specific Conductance (µS/cm)
pH (s.u.)
Water Clarity
Channel Modification (5)
Instream Habitat (20)
Bottom Substrate (15)
Pool Variety (10)
Riffle Habitat (16)
Erosion (7)
Bank Vegetation (7)
Light Penetration (10)
Left Riparian Score (5)
Right Riparian Score (5)
Total Habitat Score (100)
05/21/09 2009-44 15 38 Fair
County
PERSON
Fair
Bioclassification
Level IV EcoregionLongitude
-79.10777778
05/21/09
Date Station ID
Species Change Since Last Cycle (2009
vs. 2004)
Waterbody
S HYCO CR
AU Number
22-58-4-(3)
No
Reference Site
Subbasin
5
Latitude
36.38527778
Elevation (ft)
8 digit HUC
03010104 Southern Outer Piedmont
06/16/10
NPDES Number
---
Stream Width (m)
8
04/30/04
NF30
Site Photograph
Forested/Wetland
025
0.4
Agriculture Other (describe)
None
Watershed -- drains northwest Orange, southeastern Caswell, and southwestern Person counties; no municipalities within the watershed; site is ~ 4.5
miles downstream from Roxboro Lake dam and ~ 1.5 miles above the backwaters of Hyco Reservoir, an impoundment of the Hyco River; stream is
classified as High Quality Waters based upon its WS-II supplemental classification. Habitats -- very low flow; coarse woody debris in the channel, riparian
bottomlands, snag debris dams, stream exhibits substantial nonpoint source erosion. 2009 -- 2.3 times more fish collected in 2009 than in 2004 (556 vs.
237), especially Swallowtail Shiner, Satinfin Shiner, Eastern Mosquitofish, and Bluegill (75% of all the fish collected), 1 of 2 sites where suckers were
absent; very skewed trophic structure with only 3% omnivores+herbivores; lingering drought impacts. 2004 & 2009 -- despite a large drainage area, only
24 species are known from the site; including just 2 species of darters; dominant species is the Swallowtail Shiner; old weir below the bridge at the old gage
may be an impediment to fish movement at low flow; recolonization avenues are limited by the upstream and downstream reservoirs. Note: the site was
re-sampled in 2010 following a wetter winter and spring flow period and the community was rated Good-Fair.
Rural Residential
0
Volume (MGD)
Data Analysis
Visible Landuse (%)
Sample Date
Gains -- Crescent Shiner, Eastern Mosquitofish, Black Crappie. Losses -- Mountain Redbelly Dace, White
Sucker, Notchlip Redhorse, V-lip Redhorse, Margined Madtom, Yellow Bullhead, Redfin Pickerel, Speckled
Killifish, Yellow Perch. All species gained or lost were represented by 1-6 fish/species, except for Crescent
Shiner, V-lip Redhorse, and Eastern Mosquitofish (n=11, 13, and 36, respectively).
44
52
Average Depth (m)
---
Upstream NPDES Dischargers (>1MGD or <1MGD and within 1 mile)
75
18.7
3
Habitat Assessment Scores (max)
430
Drainage Area (mi2)
56.5
5
5
6
Green Sunfish, Bluegill
Bioclassification
Good-Fair
Good
NCIBI
5
Sample ID
7
7.3
110
6.7
Clear, slightly tannin
stained
5
13
Gravel, sand, woody debrisSubstrate
Exotic Species 2009
Species Total
21
212004-30
2010-48
FISH COMMUNITY SAMPLE
Stream Classification
WS-II,HQW,CA
US 158
Location
Swallowtail Shiner (32%) Most Abundant Species 2009
58
2
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2-B.10
Water Quality Parameters
Temperature (°C)24.1
Dissolved Oxygen (mg/L)9.8
Specific Conductance (µS/cm)139
pH (s.u.)6.5
Channel Modification (5)5
Instream Habitat (20)16
Bottom Substrate (15)8
Pool Variety (10)8
Riffle Habitat (16)10
Bank Erosion (7)1
Bank Vegetation (7)7
Light Penetration (10)10
Left Riparian Score (5)5
Right Riparian Score (5)2
Total Habitat Score (100)72
BENTHIC MACROINVERTEBRATE SAMPLE
Waterbody Location Station ID Date Bioclassification
MARLOWE CR SR 1322 NB43 08/12/09 Fair
County Subbasin 8 digit HUC Latitude Longitude AU Number Level IV Ecoregion
PERSON 5 03010104 36.483333 -78.979444 22-58-12-6b Northern Inner Piedmont
Stream Classification Drainage Area (mi2)Elevation (ft)Stream Width (m)Stream Depth (m)
C 17.8 390 9 0.1
Forested/Wetland Urban Agriculture Other (describe)
Visible Landuse (%)60 0 40
Site Photograph
Water Clarity turbid
Habitat Assessment Scores (max)
Substrate This channel was dominated by mostly sand and gravel.
Upstream NPDES Dischargers (>1MGD or <1MGD and within 1 mile)NPDES Number Volume (MGD)
Roxboro WWTP NC0021024 5.0
Bioclassification
08/12/09 10809 59 10 6.25 6.01 Fair
Sample Date Sample ID ST EPT BI EPT BI
Good-Fair
08/25/99 7988 53 9 6.35 5.74 Fair
06/30/04 9397 56 13 6.43 5.93
Taxonomic Analysis
This sampling location was dominated by pollution tolerant macroinvertebrates such as the mayflies Baetis flavistriga and Maccaffertium modestum; and
the caddisflies Cheumatopsyche spp. and Hydropsyche betteni. The root mat-dwelling caddisflies Oecetis persimilis and Trianodes ignitus were rare at
the site. The somewhat tolerant riffle beetle taxa Macronychus glabratus was abundant and the intolerant Psephenus herricki was rare at this sampling
location. Eight odonate taxa were collected in addition to 26 chironomid taxa. Polypedilum flavum was the only abundant chironomid taxa collected. No
stoneflies were collected at this site in 2009.
Data Analysis
This benthic montitoring station received a bioclassification of Fair in 2009 suggesting a transition back to degraded water quality found in 1999. EPTBI
increased slightly and EPT richness decreased from the 2004 sample. In 2009, EPT taxa richness returned to the levels observed in 1999. Chironomid
taxa richness (26) was the highest of all other sampling years at this site. Only one chironomid taxa was abundant at the site in 2009. The high
chironomid taxa richness could be due to increased drift from the rain event that occurred the night before sampling. Conductivity was lower suggesting
improvements from 2004 when levels were between 220 and 340 µS/cm. This stream drains northern portions of urban Roxboro and active row crop
agriculture was noted upstream. This site may suffer from several variables including both point and nonpoint source pollution in addition to lack of
substrate favorable to many rheophilic EPT taxa.
Poor08/24/94 6692 33 5 6.91 6.49
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Water Quality Parameters
Temperature (°C)
Dissolved Oxygen (mg/L)
Specific Conductance (µS/cm)
pH (s.u.)
Water Clarity
Channel Modification (5)
Instream Habitat (20)
Bottom Substrate (15)
Pool Variety (10)
Riffle Habitat (16)
Erosion (7)
Bank Vegetation (7)
Light Penetration (10)
Left Riparian Score (5)
Right Riparian Score (5)
Total Habitat Score (100)
County
GRANVILLE
Good
Bioclassification
Level IV EcoregionLongitude
-78.73916667
05/26/09
Date Station ID
Species Change Since Last Cycle
Waterbody
AARONS CR
AU Number
22-59
Yes
Reference Site
Subbasin
6
Latitude
36.53166667
Elevation (ft)
8 digit HUC
03010104 Carolina Slate Belt
05/26/09
NPDES Number
---
Stream Width (m)
8
04/28/04
NF31
Site Photograph
Forested/Wetland
00
0.4
Agriculture Other (describe)
None
Watershed -- drains the extreme northeast corner of Person and the extreme northwest corner of Granville counties; no municipalities in the watershed;
Habitats -- regional reference site, a typical Carolina Slate Belt-type stream with high quality instream and riparian habitat characteristics; shallow pools
and riffles, undercuts, clay banks, blow-out on upper left bank at end of reach. 2009 -- one-half the number of fish collected in 2009 than in 2004 (397 vs.
791), especially Crescent Shiner (111 vs . 321); Carolina Darter [Special Concern] collected for the first time; a slight increase in the overall diversity and
diversity of darters increased the NCIBI score, but not the rating; no change in the other metrics, trophic metrics very stable. 2004 & 2009 -- only 19
species known from this site, including 5 species of sunfish and 3 species of darters, but no intolerant species; dominant species is the Crescent Shiner;
very possible that the flow in this stream becomes very reduced during dry periods and this may have caused the lower than expected NCIBI score and
rating for a reference site.
Rural Residential
0
Volume (MGD)
Data Analysis
Visible Landuse (%)
Sample Date
Gains -- Whitemouth Shiner, Pirate Perch, Redear Sunfish, Carolina Darter, Losses -- Rosyside Dace,
Eastern Mosquitofish. All species gained or lost were represented by 1-5 fish/species.
50
46
Average Depth (m)
---
Upstream NPDES Dischargers (>1MGD or <1MGD and within 1 mile)
100
21.1
12
Habitat Assessment Scores (max)
370
Drainage Area (mi2)
27.6
5
8
Bioclassification
Good
Good
NCIBI
12
Sample ID
Most Abundant Species 2009 Fantail Darter (30%), Crescent Shiner
(28%)
10
7.2
76
6.0
Clear, easily silted
5
18
5
Cobble, boulder, gravelSubstrate
Species Total
16
152004-25
2009-45
Exotic Species 2009 Green Sunfish, Bluegill, Redear Sunfish
FISH COMMUNITY SAMPLE
Stream Classification
C
SR 1400
Location
88
6
7
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appendix 2-c
amBient monitoRing sYstems
station Data sHeets
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Ambient Monitoring System Station Summaries
NCDENR, Division of Water Quality
Basinwide Assessment Report
Station #:N3500000
Location:DAN RIV AT NC 57 AT VA LINE AT MILTON
Stream class:C
NC stream index:22-(39)
Hydrologic Unit Code:03010104
Latitude:36.54079 Longitude:-79.21422
Agency:NCAMBNT
PercentilesResults not meeting EL# results Min 10th 25th 50th 75th 90th Max
# ND EL # %%Conf
Field
D.O. (mg/L)<4 6 6.6 7.3 9.5 11.4 13 13.957000
<5 6 6.6 7.3 9.5 11.4 13 13.957000
pH (SU)<6 6.4 7 7.2 7.5 7.7 7.8 8.257000
>9 6.4 7 7.2 7.5 7.7 7.8 8.257000
Spec. conductance (umhos/cm at 25°C)N/A 68 84 102 127 165 258 293560
Water Temperature (°C)>32 4.4 7.2 10.6 17.3 25.1 27.2 29.857000
Other
TSS (mg/L)N/A 3 5.8 8.9 12 18.2 172 185204
Turbidity (NTU)>50 2.5 3.7 5.9 11 35.5 164 2405713022.8 99.9
Metals (ug/L)
Aluminum, total (Al)N/A 120 120 335 515 2480 5100 510080
Arsenic, total (As)>10 5 5 5 5 5 5 59090
Cadmium, total (Cd)>2 1 1 2 2 2 2 29090
Chromium, total (Cr)>50 10 10 25 25 25 25 259090
Copper, total (Cu)>7 2 2 2 2 4 6 69050
Iron, total (Fe)>1000 410 410 755 1000 3575 7100 710083037.5
Lead, total (Pb)>25 10 10 10 10 10 10 109090
Mercury, total (Hg)>0.012 0.2 0.2 0.2 0.2 0.2 0.2 0.28080
Nickel, total (Ni)>88 10 10 10 10 10 10 109090
Zinc, total (Zn)>50 10 10 10 10 15 46 469060
Fecal Coliform Screening(#/100mL)
# results:Geomean:# > 400:% > 400:%Conf:
57 95 13 22.8 76.2
01/12/2005Time period:12/03/2009to
Key:
# result: number of observations
# ND: number of observations reported to be below detection level (non-detect)
EL: Evaluation Level; applicable numeric or narrative water quality standard or action level
Results not meeting EL: number and percentages of observations not meeting evaluation level
Stations with less than 10 results for a given parameter were not evaluated for statistical confidence
%Conf : States the percent statistical confidence that the actual percentage of exceedances is at least 10% (20% for Fecal Coliform)
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Ambient Monitoring System Station Summaries
NCDENR, Division of Water Quality
Basinwide Assessment Report
Station #:N4250000
Location:HYCO RIV BELOW AFTERBAY DAM NR MCGHEES MILL
Stream class:C
NC stream index:22-58-(9.5)
Hydrologic Unit Code:03010104
Latitude:36.52353 Longitude:-78.99600
Agency:NCAMBNT
PercentilesResults not meeting EL# results Min 10th 25th 50th 75th 90th Max
# ND EL # %%Conf
Field
D.O. (mg/L)<4 6.3 6.7 7.1 9 10.9 11.8 12.646000
<5 6.3 6.7 7.1 9 10.9 11.8 12.646000
pH (SU)<6 5.9 6.4 6.6 7.1 7.3 7.4 7.848102.1
>9 5.9 6.4 6.6 7.1 7.3 7.4 7.848000
Salinity (ppt)N/A 0 0 0.1 0.1 0.1 0.1 0.180
Spec. conductance (umhos/cm at 25°C)N/A 104 107 110 124 178 255 285470
Water Temperature (°C)>32 5.2 7.9 9.5 17.3 23.3 26.1 28.948000
Other
TSS (mg/L)N/A 3 3.7 4.7 6.2 6.6 10.2 12187
Turbidity (NTU)>50 2.3 3.2 4 4.9 5.9 8.5 9.747000
Metals (ug/L)
Aluminum, total (Al)N/A 160 160 160 215 368 410 41080
Arsenic, total (As)>10 5 5 5 5 5 5 59090
Cadmium, total (Cd)>2 1 1 2 2 2 2 29090
Chromium, total (Cr)>50 10 10 25 25 25 25 259090
Copper, total (Cu)>7 2 2 2 2 2 2 29060
Iron, total (Fe)>1000 250 250 275 405 520 860 8608000
Lead, total (Pb)>25 10 10 10 10 10 10 109090
Mercury, total (Hg)>0.012 0.2 0.2 0.2 0.2 0.2 0.2 0.28080
Nickel, total (Ni)>88 10 10 10 10 10 10 109090
Zinc, total (Zn)>50 10 10 10 10 12 17 179070
Fecal Coliform Screening(#/100mL)
# results:Geomean:# > 400:% > 400:%Conf:
44 9.1 0 0
01/10/2005Time period:11/16/2009to
Key:
# result: number of observations
# ND: number of observations reported to be below detection level (non-detect)
EL: Evaluation Level; applicable numeric or narrative water quality standard or action level
Results not meeting EL: number and percentages of observations not meeting evaluation level
Stations with less than 10 results for a given parameter were not evaluated for statistical confidence
%Conf : States the percent statistical confidence that the actual percentage of exceedances is at least 10% (20% for Fecal Coliform)
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Ambient Monitoring System Station Summaries
NCDENR, Division of Water Quality
Basinwide Assessment Report
Station #:N4400000
Location:MARLOWE CRK AT SR 1322 NR WOODSDALE
Stream class:C
NC stream index:22-58-12-6
Hydrologic Unit Code:03010104
Latitude:36.48325 Longitude:-78.97941
Agency:NCAMBNT
PercentilesResults not meeting EL# results Min 10th 25th 50th 75th 90th Max
# ND EL # %%Conf
Field
D.O. (mg/L)<4 6.5 6.9 7.6 9.3 12.1 13.5 14.246000
<5 6.5 6.9 7.6 9.3 12.1 13.5 14.246000
pH (SU)<6 6.2 6.5 6.8 7.1 7.4 7.7 8.848000
>9 6.2 6.5 6.8 7.1 7.4 7.7 8.848000
Salinity (ppt)N/A 0.1 0.1 0.1 0.1 0.2 0.3 0.380
Spec. conductance (umhos/cm at 25°C)N/A 114 156 184 263 405 582 729470
Water Temperature (°C)>32 2.2 6.2 9.9 15.1 21.9 23.6 26.348000
Other
TSS (mg/L)N/A 2.5 3.7 6.2 7 12.5 22.8 66188
Turbidity (NTU)>50 1.2 2.4 3.6 4.9 8.8 21 6547204.3
Nutrients (mg/L)
NH3 as N N/A 0.02 0.02 0.02 0.02 0.02 0.02 0.0211
NO2 + NO3 as N N/A 0.87 0.87 0.87 0.87 0.87 0.87 0.8710
TKN as N N/A 0.53 0.53 0.53 0.53 0.53 0.53 0.5310
Total Phosphorus N/A 0.3 0.3 0.3 0.3 0.3 0.3 0.310
Metals (ug/L)
Aluminum, total (Al)N/A 100 100 170 360 755 1000 100090
Arsenic, total (As)>10 5 5 5 5 5 5 59090
Cadmium, total (Cd)>2 1 1 2 2 2 2 29090
Chromium, total (Cr)>50 10 10 25 25 25 25 259090
Copper, total (Cu)>7 2 2 4 4 7 16 1692122.2
Iron, total (Fe)>1000 190 190 415 570 845 2200 220091011.1
Lead, total (Pb)>25 10 10 10 10 10 10 109090
Mercury, total (Hg)>0.012 0.2 0.2 0.2 0.2 0.2 0.2 0.28080
Nickel, total (Ni)>88 10 10 10 10 10 10 109090
Zinc, total (Zn)>50 12 12 26 46 57 630 63094044.4
Fecal Coliform Screening(#/100mL)
# results:Geomean:# > 400:% > 400:%Conf:
47 81.7 5 10.6
01/10/2005Time period:11/16/2009to
Key:
# result: number of observations
# ND: number of observations reported to be below detection level (non-detect)
EL: Evaluation Level; applicable numeric or narrative water quality standard or action level
Results not meeting EL: number and percentages of observations not meeting evaluation level
Stations with less than 10 results for a given parameter were not evaluated for statistical confidence
%Conf : States the percent statistical confidence that the actual percentage of exceedances is at least 10% (20% for Fecal Coliform)
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Ambient Monitoring System Station Summaries
NCDENR, Division of Water Quality
Basinwide Assessment Report
Station #:N4510000
Location:HYCO RIV AT US 501 NR DENNISTON VA
Stream class:III NT
NC stream index:
Hydrologic Unit Code:03010104
Latitude:36.58805 Longitude:-78.89814
Agency:NCAMBNT
PercentilesResults not meeting EL# results Min 10th 25th 50th 75th 90th Max
# ND EL # %%Conf
Field
D.O. (mg/L)N/A 5.9 6.4 6.9 8.7 10.8 11.7 12.6460
pH (SU)N/A 6.2 6.2 6.7 7 7.2 7.5 7.9480
Salinity (ppt)N/A 0.1 0.1 0.1 0.1 0.1 0.1 0.180
Spec. conductance
(umhos/cm at 25°C)
N/A 102 130 144 168 193 234 265470
Water Temperature (°C)N/A 3.9 5.7 9 15.3 23.6 26 27.2480
Other
TSS (mg/L)N/A 2.5 2.5 3.9 6.2 6.9 21.5 351810
Turbidity (NTU)N/A 1.7 2.8 4.1 6.3 10 27 95470
Metals (ug/L)
Aluminum, total (Al)N/A 87 87 109 200 660 1600 160090
Arsenic, total (As)N/A 5 5 5 5 5 5 599
Cadmium, total (Cd)N/A 1 1 2 2 2 2 299
Chromium, total (Cr)N/A 10 10 25 25 25 25 2599
Copper, total (Cu)N/A 2 2 2 2 3 4 493
Iron, total (Fe)N/A 99 99 470 580 1095 2300 230090
Lead, total (Pb)N/A 10 10 10 10 10 10 1099
Manganese, total (Mn)N/A 120 120 128 155 160 160 16040
Mercury, total (Hg)N/A 0.2 0.2 0.2 0.2 0.2 0.2 0.288
Nickel, total (Ni)N/A 10 10 10 10 10 10 1099
Zinc, total (Zn)N/A 10 10 10 10 16 41 4196
Fecal Coliform Screening(#/100mL)
# results:Geomean:# > 400:% > 400:%Conf:
47 61 1 2.1
01/10/2005Time period:11/16/2009to
Key:
# result: number of observations
# ND: number of observations reported to be below detection level (non-detect)
EL: Evaluation Level; applicable numeric or narrative water quality standard or action level
Results not meeting EL: number and percentages of observations not meeting evaluation level
Stations with less than 10 results for a given parameter were not evaluated for statistical confidence
%Conf : States the percent statistical confidence that the actual percentage of exceedances is at least 10% (20% for Fecal Coliform)
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Ambient Monitoring System Station Summaries
NCDENR, Division of Water Quality
Basinwide Assessment Report
Station #:N4590000
Location:MAYO CRK AT SR 1501 NR BETHEL HILL
Stream class:C
NC stream index:22-58-15-(3.5)
Hydrologic Unit Code:03010104
Latitude:36.54021 Longitude:-78.87362
Agency:NCAMBNT
PercentilesResults not meeting EL# results Min 10th 25th 50th 75th 90th Max
# ND EL # %%Conf
Field
D.O. (mg/L)<4 6.4 7 8.1 9.5 11.1 11.6 12.646000
<5 6.4 7 8.1 9.5 11.1 11.6 12.646000
pH (SU)<6 6.1 6.4 6.5 7 7.3 7.7 8.448000
>9 6.1 6.4 6.5 7 7.3 7.7 8.448000
Salinity (ppt)N/A 0 0 0 0.05 0.1 0.1 0.180
Spec. conductance (umhos/cm at 25°C)N/A 92 97 113 119 128 140 160470
Water Temperature (°C)>32 4.7 7.2 9.8 16.3 22.1 24.9 31.648000
Other
TSS (mg/L)N/A 2.5 2.5 2.5 6.2 6.2 6.3 71814
Turbidity (NTU)>50 1 1 1 1.3 2 2.9 3.9470100
Metals (ug/L)
Aluminum, total (Al)N/A 50 50 50 58 76 210 21093
Arsenic, total (As)>10 5 5 5 5 5 5 59090
Cadmium, total (Cd)>2 1 1 2 2 2 2 29090
Chromium, total (Cr)>50 10 10 25 25 25 25 259090
Copper, total (Cu)>7 2 2 2 2 2 3 39070
Iron, total (Fe)>1000 50 50 50 72 102 670 6709030
Lead, total (Pb)>25 10 10 10 10 10 10 109090
Mercury, total (Hg)>0.012 0.2 0.2 0.2 0.2 0.2 0.2 0.28080
Nickel, total (Ni)>88 10 10 10 10 10 10 109090
Zinc, total (Zn)>50 10 10 10 10 11 14 149070
Fecal Coliform Screening(#/100mL)
# results:Geomean:# > 400:% > 400:%Conf:
46 7.6 1 2.2
01/10/2005Time period:11/16/2009to
Key:
# result: number of observations
# ND: number of observations reported to be below detection level (non-detect)
EL: Evaluation Level; applicable numeric or narrative water quality standard or action level
Results not meeting EL: number and percentages of observations not meeting evaluation level
Stations with less than 10 results for a given parameter were not evaluated for statistical confidence
%Conf : States the percent statistical confidence that the actual percentage of exceedances is at least 10% (20% for Fecal Coliform)
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appendix 2-d
10-Digit wateRsHeD maPs
FoR tHe LoweR Dan RiveR suBBasin
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2-D.3
Smith Riv e r
D
A
N
R
I
V
E
R
ROCKINGHAM
GUILFORD
CASWELL
ALAMANCE
ORANGEPERSON
Yanceyville
ReidsvilleJ
o
n
e
s
C
r.
H
o
g
a
n
s
C
r.
M
o
o
n
C
r.
DAN
RIVE
R
C
o
u
n
t
r
y
L
in
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C
r
CountryLine
C
r
HycoCr
HycoLake
Lake
Roxboro
ROA030DE
ROA030DC ROA030DAROA030CROA030E
ROA027GROA027J
ROA027L
Farmer
Lake
NF30
S
o
uthHycoCr
NB40
NB22
N3500000
NF26
NF24
NF15
NB116
NB84
NF35
N3410000
RattlesnakeCr.
HogansCr.
ROCKINGHAM
CASWELL
Eden
Wentworth Reidsville
ROCKINGHAM
US-29
US-158
NC-62
NC-119
NC-700
N C -86
N
C
-1
5
0
U
S-2
9-B
U
S
NC-87
NC-57
NC-770
N C -1 4
N
C
-87
,15
0
U S-2 9-B U S
N C -8 6
NC-150
US-29
NC-87
Hogan
Creek-Dan
River
Watershed
(0301010401)
Legend
Permits
Animal
Operation
Permits
Monitoring
Sites
2010
Use
Support
Minor
NPDES
Dischargers
Major
NPDES
Dischargers
NPDES
Non-Dischargers
NPDES
Stormwater
Individual
State
Cattle
Swine
Wet
Poultry
NPDES
Aquaculture
Supporting
Not
Rated
No
Data
Impaired
Primary
Roads
Municipalities
County
Boundaries
8-Digit
HUC
#*XY #0 E k "Y
USGS
Gage
Stations
!<
RAMS
(`09-`10)
¢¡
RAMS
(`07-`08)
¢¡
Lake
Stations
^
Benthos
"à)
Fish
Community
[¡
Ambient
¢¡
NC
Division
of
Water
Quality
Basinwide
Planning
Unit
August
2011
¯
0
2
4
6
8
1
Miles
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2-D.4
ROCKINGHAM
GUILFORD
ALAMANCE
ORANGE
PERSON
Yanceyville
Reidsville Jo
n
e
s
C
r.
H
o
g
a
n
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R
C
o
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tr
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Lin
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C
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HycoCr
Hyco
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MarloweCr
ROA031H
ROA031E
ROA031C
ROA030DE
ROA030DC
ROA030DA
ROA030C
ROA030E
ROA030F
ROA030G
ROA027G
ROA027J ROA027L
Farmer
Lake
N4250000
N4400000
NB43NB85
NF30
S
o
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HycoCr
NB40
NB22
N3500000
NF26
NF24
NF15
NB116
NB84
NF35
N3410000
Rattlesna k e C r.
HogansCr.
ROCKINGHAM
CASWELL
US-158
NC-62
NC-119
NC-57
NC-86
US-29
N
C-4
9
N
C-1
5
0
NC-700
NC-87
U
S-2
9
-
B
U
S
NC-86
U
S-2
9
Country
Line
Creek
Watershed
(0301010402)
Legend
Permits
Animal
Operation
Permits
Monitoring
Sites
2010
Use
Support
Minor
NPDES
Dischargers
Major
NPDES
Dischargers
NPDES
Non-Dischargers
NPDES
Stormwater
Individual
State
Cattle
Swine
Wet
Poultry
NPDES
Aquaculture
Supporting
Not
Rated
No
Data
Impaired
Primary
Roads
Municipalities
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8-Digit
HUC
#*XY#0Ek"Y
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RAMS
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NC
Division
of
Water
Quality
BasinwidePlanning
Unit
October
2011
¯
0
2
4
6
8
1
Miles
SouthCountryL
ineCreek
H
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B
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Roa
n
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(
H
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0
3
0
1
0
1
0
4
)

a
PP
en
DiCes
2-D.5
ROCKINGHAM
GUILFORD
ALAMANCE
ORANGE
PERSON
Yanceyville
Roxboro
ReidsvilleJ
o
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e
s
C
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H
o
g
a
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s
C
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M
o
o
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C
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DANRIV
E
R
C
o
u
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tr
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Lin
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Creek
CountryLin
e
C
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e
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k HycoCr
Hyco
Lake
Lake
Roxboro
Lake
Issac
Walton
M a rlo w e Cr
MayoCrN4590000ROA0343AROA0342AROA0341A
ROA031H
ROA031E
ROA031C
ROA030DE
ROA030DC
ROA030DA
ROA030C
ROA030EROA030F
ROA030G
ROA027G
ROA027J
ROA027L
Farmer
Lake
N4250000
N4400000
NB43
NB85
NB118
NB119
NF30
S
o
uth
HycoCr
NB40
NB22
NF26
NF24
NF15
NB116
NB84
NF35
N3410000
RattlesnakeCr.
HogansCr.
ROCKINGHAM
CASWELL
ReedyForkCr.
NC-119
NC -8 9
NC
-
4
9
US-158
N C -5 7
US-158
NC-62
NC-119
N C-57
NC-49
NC-157
N C -86
US-29
N
C
-
1
5
0
US-501
N C-87
NC-700
U S -1 5 8,5 01
NC-86
NC-86
N
C-57
N
C-49
US-29
US-501
Hyco
Lake
Watershed
(0301010405)
Legend
Permits
Animal
Operation
Permits
Monitoring
Sites
2010
Use
Support
Minor
NPDES
Dischargers
Major
NPDES
Dischargers
NPDES
Non-Dischargers
NPDES
Stormwater
Individual
State
Cattle
Swine
Wet
Poultry
NPDES
Aquaculture
Supporting
Not
Rated
No
Data
Impaired
Primary
Roads
Municipalities
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Boundaries
8-Digit
HUC
#*XY #0 E k "Y
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Gage
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NC
Division
of
Water
Quality
Basinwide
Planning
Unit
October
2011¯
0
2.5
5
7.5
10
1.25
Miles
Roa
n
o
k
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R
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R B
as
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:
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(
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0
3
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1
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4
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a
PP
en
DiCes
2-D.6
Rattlesn
a
k
e
Cr
Roxboro
HycoLake
Lake
Issac
Walton
MarloweCreek
M
ayoCreek
Mayo
Reservoir
CrookedFk
AaronsCr
NF31
NB112
N4590000
ROA0343A
ROA0342A
ROA0341A
ROA031H
ROA031E
ROA031C
ROA030CROA030E
ROA030F
ROA030G
N4250000
N4400000
NB43
NB85NB118
NB119
NF30
US-158
NC-57
Roxboro
PERSON
GRANVILLE
G
hentCr.
MillCreek
CastleCr.
Hyco
Lake
Big
BluewingCr.
BlueCre
e
k
MountainCreek
Johnso
n
Creek
Littl
e Johnson
C
r
e
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NC-49
US-501
NC-96
NC-57
US-158
NC-157
US-158,501
US-501
NC-49
US-158
Hyco
River
Watershed
(0301010406)
Legend
Permits
Animal
Operation
Permits
Monitoring
Sites
2010
Use
Support
Minor
NPDES
Dischargers
Major
NPDES
Dischargers
NPDES
Non-Dischargers
NPDES
Stormwater
Individual
State
Cattle
Swine
Wet
Poultry
NPDES
Aquaculture
Supporting
Not
Rated
No
Data
Impaired
Primary
Roads
Municipalities
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8-Digit
HUC
#*XY#0Ek"Y
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Division
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Water
Quality
Basinwide
Planning
Unit
October
2011
¯
0
1
2
3
4
0.5
Miles
Roa
n
o
k
e
R
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R B
as
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:
L
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R D
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(
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0
3
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1
0
1
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4
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a
PP
en
DiCes
2-D.7
Rattles
n
a
k
e
Cr
KerrReservoir
M a rl o w e C r e e k
MayoCreek
Mayo
Reservoir
CrookedFk
AaronsCreek
NF31
NB112
N4590000
ROA0343A
ROA0342A
ROA0341A
NB118
NB119
PERSON
GRANVILLE
MillCreek
C a stle C r .
Big
BluewingCr.
NB64
NB87
NB86
BlueCre
e
k
MountainCreek
Johnson
Creek
Little
J
ohnsonCreek
N C-9 6
NC-49
US-501
NC-49,96
Aarons
Creek-Dan
River
Watershed
(0301010407)
Legend
Permits
Animal
Operation
Permits
Monitoring
Sites
2010
Use
Support
Minor
NPDES
Dischargers
Major
NPDES
Dischargers
NPDES
Non-Dischargers
NPDES
Stormwater
Individual
State
Cattle
Swine
Wet
Poultry
NPDES
Aquaculture
Supporting
Not
Rated
No
Data
Impaired
Primary
Roads
Municipalities
County
Boundaries
8-Digit
HUC
#*XY #0 E k "Y
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Gage
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!<
RAMS
(`09-`10)
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RAMS
(`07-`08)
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^
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NC
Division
of
Water
Quality
Basinwide
Planning
Unit
October
2011
¯
0
0.9
1.8
2.7
3.6
0.45
Miles
Roa
n
o
k
e
R
iv
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R B
as
i
n
:
L
ow
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R D
an
R
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R suBB
as
i
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(
H
uC
0
3
0
1
0
1
0
4
)

a
PP
en
DiCes
2-D.8