Attachment C - UAS

Atachment C
Use Atainability Study
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Water Sciences Section Intensive Survey Branch
Division of Water Resources Use Attainability Study for the Proposed
Reclassifications of Portions of the Yadkin River, South Yadkin River, and
Associated Tributaries

NORTH CAROLINA DEPARTMENT OF ENVIRONMENTAL QUALITY
DIVISION OF WATER RESOURCES
WATER SCIENCES SECTION

THIS REPORT HAS BEEN APPROVED FOR RELEASE

_____________________________

Chris Johnson
Chief, Water Sciences Section

DATE:______April 2, 2024______________________________

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Water Sciences Section Intensive Survey Branch
NC Division of Water Resources
Water Sciences Section

Use Attainability Study for the Proposed Reclassifications of Portions of the Yadkin River,
South Yadkin River, and Associated Tributaries

Class WS-V to either Class WS-IV or Class WS-IV (CA); and Class C to Class WS-IV
Rowan, Davie, and Davidson Counties
8-digit HUCs: 03040101, 03040102, 03040103
Stream Index Numbers: 12-(108.5), 12-109, 12-108-(19.5), 12-108-20, 12-108-21, 12-108-21-4,
12-108-21-4-1, 12-108-21-5
The following represents the findings of the Use Attainability Study for the Proposed
Reclassification of Portions of the Yadkin River, South Yadkin River, and Associated Tributaries,
performed by the Intensive Survey Branch of the North Carolina Division of Water Resources.
Study Plan and supporting documents can be found by contacting Intensive Survey Branch staff.

Purpose and Background:
At the request of the Classifications and Standards Branch (CSB) of the NC Division of Water
Resources (DWR), the Intensive Survey Branch (ISB) developed and performed a Use Attainability
Study (UAS) in the Yadkin River watershed near the town of Salisbury, NC. Data collected from
this effort will be used to inform the proposed reclassifications in portions of the Yadkin River,
South Yadkin River, Second Creek, Beaverdam Creek, Walnut Branch, Setman Branch, Fourth
Creek, and the entirety of Deals Creek.
To support their intention to relocate the current drinking water intake and pump station,
Salisbury-Rowan Utilities (SRU) has requested the reclassification of surface waters within a new
proposed critical area (CA) and protected area (PA). The proposed CA extends 0.5 mile upstream
from the proposed new intake. The proposed PA extends 10 miles upstream of the proposed new
intake location (Figure 1). This study examines the following reclassifications:
• Portions of:
o South Yadkin River (Class C to WS-IV)
o Second Creek (Class C to WS-IV)
o Beaverdam Creek (Class C to WS-IV)
o Walnut Branch (Class C to WS-IV)
o Setman Branch (Class C to WS-IV)
o Fourth Creek (Class C to WS-IV)
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Water Sciences Section Intensive Survey Branch

• Entirety of:
o Deals Creek (Class C to WS-IV)
This study also examines the associated tributaries within the proposed PA.
In addition, smaller segments of the Yadkin River, South Yadkin, and Deals Creek located within
the proposed 0.5-mile CA will require classification to WS-IV (CA).
Information on definitions of Class C, WS-IV, WS-IV (CA) can be found on the NC Standards and
Classifications webpage (Classifications | NC DEQ).
The area observed in this assessment consists of several small order tributaries in the North
Carolina Piedmont, feeding the main stem of the Yadkin River in Rowan, Davie, and Davidson
Counties. The surrounding land use of these water resources consists approximately of 50
percent forested, 30 percent mixed agriculture, and the remaining residential. The sampling
timeframe was relatively dry, with little recorded precipitation in October and November, with
more measurable rains before the final sampling event in December of 2023.

Methods for Physical and Chemical Collection:
Following the study plan, four new sampling sites were established to assess the suitability of
these resources as potable water supplies (Table 1 and Figure 1). YADYR1 is located at the new
proposed intake location in the Yadkin River within the proposed Critical Area. The three
remaining sites are on the South Yadkin River (YADSY2), Second Creek (YADSC3), and Deals Creek
(YADDC4). Sites were selected based on their respective bridge crossings on highway US-601, to
allow ease of sampler access, as well as their upstream proximity of the proposed new intake
location which addresses any inputs to the study area. All four sites were sampled for physical
and chemical water quality parameters (Table 2) monthly from October through December of
2023, for a total of three sampling events for each site. All physical and chemical samples were
collected following the methods described per the Intensive Survey Branch Standard Operating
Procedures Manual: Physical and Chemical Monitoring Version 2.1 December 2013.
Handheld, multi-parameter hydrosondes were utilized to monitor temperature, pH, dissolved
oxygen, and conductivity at each station during sampling events, at approximately 0.15 meters
(m) below the surface. YADYR1 was sampled at depth, and therefore has physical readings at 1 m
intervals to the river bottom. Secchi depth readings were also taken at YADYR1, to determine
profile sampling depth. Profile sampling at the other 3 locations was impractical, therefore only
surface grabs (depth of 0.15m) were utilized.
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Water Sciences Section Intensive Survey Branch
Chemical parameters were selected based on relevant North Carolina (NC) Water Quality
Standards (WQS) for surface waters: WS-IV and/or National Primary Drinking Water Regulations
Maximum Contaminant Levels (MCLs) as published by the United States Environmental
Protection Agency. Samples were recovered using an integrated sampler for profile samples at
YADYR1 while using surface grabs for the remaining sampling locations. Metals analysis included
both total recoverable and dissolved metals. Acid herbicide analysis was performed by GEL
Laboratories, Charleston SC. All other chemical analyses were performed by the DWR Central
Laboratory in Raleigh, NC.
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Water Sciences Section Intensive Survey Branch
Figure 1. UAS Monitoring Locations within the Proposed Protected Area

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Water Sciences Section Intensive Survey Branch
Table 1. UAS Site Locations for Physical and Chemical Monitoring
Station Latitude Longitude Site Description
YADYR1 35.740923 -80.458362 YADKIN RIVER APPROX 125FT DOWNSTREAM
OF DEALS CREEK CONFLUENCE
YADSY2 35.778408 -80.506638 SOUTH YADKIN RIVER AT US601 BOAT ACCESS
UPSTREAM OF US601 CROSSING
YADSC3 35.762062 -80.510937 SECOND CREEK AT US601 CROSSING
YADDC4 35.745565 -80.506639 DEALS CREEK UPSTEAM OF US601 CROSSING

Table 2. Physical and Chemical Parameters Collected and Analyzed
Metric
Physical Parameters
• Temperature (°C)
• pH (s.u.)
• Dissolved Oxygen
(mg/L)
• Dissolved Oxygen
(% saturation)
• Conductivity (µS/cm)

Chemical Parameters
• PCBs (µg/L)
• Acid Herbicides (µg/L)
• Inorganic Phenol (µg/L)
• Chlorophyll a (µg/L)
• Turbidity (NTU)
• Total Dissolved Solids (mg/L)
• Total Residue (mg/L)
• Suspended Residue (mg/L)
• Nitrate + Nitrite (mg/L)
• Nitrate (mg/L)
• Hardness (total as CaCO3)
• PFAS (ng/L)
• Bromide (mg/L)
• Chloride (mg/L)
• Fluoride (mg/L)
• Sulfates (mg/L)
• Cyanide (mg/L)
• MBAS (Methylene-Blue
Active-Sub) (mg/L)
• Volatile Organics (µg/L)
• Semi-Volatile Organics (µg/L)
• 1,4-dioxane (µg/L)
Metals (total & dissolved) (mg/L)
• Antimony
• Arsenic (total)
• Barium (total)
• Beryllium
• Cadmium
• Chromium (total)
• Copper
• Lead
• Mercury (total)
• Nickel (total)
• Selenium
• Silver
• Thallium
• Zinc
Pesticides (µg/L)
• Organochlorine
• Organonitrogen
• Organophosphorus
Microorganisms
• Fecal Coliform
(cfu/100mL)

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Water Sciences Section Intensive Survey Branch
Results:
Physical Data
All in situ physical readings collected during this study, other than the two November readings
discussed below, were found to be within the limits of NC WQS for surface waters classified as C,
WS-IV, and WS-IV (CA). Dissolved oxygen readings ranged from 8.8 - 11.8 milligrams per liter
(mg/L) at all surface locations and showed little signs of stratification through the water column
on the profile readings at YADYR1. Measurements for pH ranged from 5.9 – 7.0 standard units
(s.u.) throughout the entire study. Two values at YADSC3 and YADDC4 in November showed pH
values of 5.9 s.u., just slightly below the WQS of 6.0 s.u. Values observed for specific conductivity
(SC) ranged between 71 and 165 µmhos/cm. YADSC3 showed the highest SC values of all readings
taken. Secchi readings were only taken at YADYR1 as mentioned earlier. These values varied
among the 3 sampling events with October and November having Secchi readings of 1.6 m and
1.1 m, respectively, while the number dropped significantly in December to 0.2 m. It is noted that
the sand dredge was in operation during the December sampling event, causing noticeably higher
cloudiness to the water. Results of surface in situ physical data , as well as at 1-meter intervals at
YADYR1, are summarized in Table 3.
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Water Sciences Section Intensive Survey Branch
Table 3. Physical Data Summary
Station
ID
Date
(m/d/y)
Time
(24hr)
Depth
(m)
Temp
(°C)
DO
(mg/L)
DO
(% sat)
pH
(s.u.)
Cond
(µmhos/cm)
Secchi
(m)
YADYR1 10/26/23 10:00 0.2 14.2 9.9 96.9 6.3 101 1.6
YADYR1 10/26/23 10:00 1 14.1 9.9 96.7 6.3 101 1.6
YADYR1 10/26/23 10:00 2 14 9.9 96.5 6.5 101 1.6
YADYR1 10/26/23 10:00 3 13.9 9.9 96.4 6.6 101 1.6
YADYR1 10/26/23 10:00 4 13.8 9.8 95.5 6.6 100 1.6
YADYR1 10/26/23 10:00 4.1 13.7 9.8 95.4 6.6 101 1.6
YADSY2 10/26/23 13:15 0.2 13.4 10.1 97.7 6.4 95 NS
YADSC3 10/26/23 12:00 0.4 12.8 9.8 93.5 6.1 137 NS
YADDC4 10/26/23 14:25 0.3 16.2 8.8 90.5 6.6 113 NS
YADYR1 11/27/23 10:20 0.2 8.2 11.2 97.3 7 93 1.1
YADYR1 11/27/23 10:20 1 8.2 11.2 96.9 6.8 97 1.1
YADYR1 11/27/23 10:20 2 8.1 11.2 96.9 6.8 98 1.1
YADYR1 11/27/23 10:20 3 8.1 11.2 96.8 6.8 99 1.1
YADYR1 11/27/23 10:20 4 8.0 11.2 96.8 6.9 100 1.1
YADYR1 11/27/23 10:20 4 8.0 11.2 96.9 6.9 100 1.1
YADSY2 11/27/23 12:30 0.2 7.7 11.8 100.8 6.0 98 NS
YADSC3 11/27/23 13:30 0.3 7.7 11.5 99 5.9 165 NS
YADDC4 11/27/23 14:30 0.3 10.1 10.7 97.1 5.9 121 NS
YADYR1 12/13/23 9:35 0.2 6.7 11.1 90.6 6.8 71 0.2
YADYR1 12/13/23 9:35 1 6.7 11.1 90.5 6.8 71 0.2
YADYR1 12/13/23 9:35 2 6.7 11.1 90.3 6.8 72 0.2
YADYR1 12/13/23 9:35 3 6.7 11.0 90.1 6.8 72 0.2
YADYR1 12/13/23 9:35 4 6.8 11.0 90.1 6.8 72 0.2
YADYR1 12/13/23 9:35 4.3 6.8 11.0 90.1 6.8 72 0.2
YADSY2 12/13/23 11:00 0 5.9 11.5 92.1 7 81 NS
YADSC3 12/13/23 12:00 0.1 5.3 11.4 90 7 117 NS
YADDC4 12/13/23 13:00 0 7.5 11.0 91.9 6.9 113 NS
*NS = No sample

Chemical Data
Nutrients and Chlorophyll a
No exceedances were present in any sample analyzed for nutrients and chlorophyll a. Nitrate
samples from all study locations indicated nutrient levels below the NC WQS of 10 mg/L. All
samples analyzed for nitrite were below the practical quantitative limit (PQL) of 0.02 mg/L. PQL
is defined here as the lowest concentration that can be reliably achieved within specified limits
of precision and accuracy during routine laboratory operating conditions. Chlorophyll a samples,
which are used as a measure of algal growth, indicated concentrations well below the NC WQS
for surface waters classified as WS-IV of 40 µg/L. Although many samples are qualified indicating
laboratory error, no value approaches the exceedance level to raise any concern. Qualified data
is represented in the summary table but excluded from averages. Nutrient and chlorophyll a
analytical results are summarized in Table 4.

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Water Sciences Section Intensive Survey Branch
Table 4. Nutrient and Chlorophyll a Data Summary
Station
ID
Date
(m/d/y)
NO3 nitrate
(mg/L as N)
NO2 nitrite
(mg/L as N)
NOX
(mg/L as N)
Chlorophyll a
(µg/L)
YADYR1 10/26/23 1.128 0.02 U 0.05 U 1.3
YADSY2 10/26/23 0.807 0.02 U 0.83 1.3
YADSC3 10/26/23 0.479 0.02 U 0.50 1.2
YADDC4 10/26/23 0.258 0.02 U 0.28 1.0 U
YADYR1 11/27/23 1.109 0.02 U 1.1 5.6 J2
YADSY2 11/27/23 0.82 0.02 U 0.84 1.2 U, J2, P
YADSC3 11/27/23 0.706 0.02 U 0.73 1.5 J2
YADDC4 11/27/23 0.407 0.02 U 0.43 2.9 J2
YADYR1 12/13/23 0.871 0.02 U 0.89 10 V1
YADSY2 12/13/23 1.004 0.02 U 1.0 4.0 V1
YADSC3 12/13/23 0.854 0.02 U 0.87 3.6 V1
YADDC4 12/13/23 0.714 0.02 U 0.73 1.4 V1
Qualifier Codes:
U: Indicates that the analyte was analyzed for, but not detected above, the reported PQL.
V1: The analyte was detected in both the sample and the method blank.
J2: The reported value failed to meet the established quality control criteria for either precision or accuracy.
P: Sample dilution occurred due to either matrix interference or target analytes being present at concentrations greater than the
calibration curve.

Chloride, Fluoride, Bromide, Sulfate, Phenol, and Cyanide
Additional parameters tested including fluoride, bromide, phenol, and cyanide, all registered as
non-detects across all sampling locations and events. Chloride results varied from 5.1-11 mg/L
between all sites, well below the NC WQS of 250 mg/L. Sulfate samples collected in this study
read between 3.4 and 11 mg/L, below the state standard of 250 mg/L. As mentioned earlier, all
phenols sampled in this study were non-detects with one sample, YADYR1, qualified as below the
PQL from the October sampling event. This analysis is qualified with a J4 meaning the data is
questionable due to improper laboratory procedure. Due to the consistent low levels observed
for phenol, it is reported with the appropriate qualifiers for the purpose of this report. Worth
noting, the suffix _SUR determines these samples were collected as a surface grab and did not
use an integrated sampler. However, all locations remain the same as listed in Table 1. Analytical
results for chloride, fluoride, bromide, sulfate, phenol, and cyanide are summarized in Table 5.
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Water Sciences Section Intensive Survey Branch
Table 5. Chloride, Fluoride, Bromide, Sulfate, Phenol, and Cyanide Data Summary
Station
ID Date (m/d/y) Chloride
(mg/L)
Fluoride
(mg/L)
Bromide
(mg/L)
Sulfate
(mg/L)
Phenol
(mg/L)
Cyanide
(mg/L)
YADYR1_SUR 10/26/2023 8.0 0.4U 0.4U 4.5 10U, J2 0.005U
YADYR1_SUR 11/27/2023 7.2 0.4U 0.4U 4.7 10U 0.005U
YADYR1_SUR 12/12/2023 5.1 0.4U 0.4U 4.3 10U 0.1U
YADSY2_SUR 10/26/2023 6.4 0.4U 0.4U 3.4 10U 0.005U
YADSY2_SUR 11/27/2023 6.4 0.4U 0.4U 3.9 10U 0.005U
YADSY2_SUR 12/12/2023 5.5 0.4U 0.4U 5.7 10U 0.005U
YADSC3_SUR 10/26/2023 7.2 0.4U 0.4U 6.0 10U 0.005U
YADSC3_SUR 11/27/2023 11 0.4U 0.4U 12 10U 0.005U
YADSC3_SUR 12/12/2023 7.2 0.4U 0.4U 7.6 10U 0.005U
YADDC4_SUR 10/26/2023 5.9 0.4U 0.4U 8.1 10U 0.005U
YADDC4_SUR 11/27/2023 6.0 0.4U 0.4U 9.2 10U 0.005U
YADDC4_SUR 12/12/2023 6.1 0.4U 0.4U 11 10U 0.005U
Qualifier Codes:
U: Indicates that the analyte was analyzed for, but not detected above, the reported PQL.
J2: The reported value failed to meet the established quality control criteria fort either precision or accuracy.

Turbidity, Total Dissolved Solids, Methylene Blue Activated Substances, and Hardness
All analytical results for total dissolved solids (TDS), and methylene blue activated substances
(MBAS), and hardness, collected for this effort were found to be within the NC WQS for surface
waters classified as WS-IV. TDS values fell between 61 and 112 mg/L. While TDS values did not
exceed any standard, YADSDC3 did show elevated levels compared to other samples in this study.
Turbidity results for all samples, under the state standard definition, are between 4.3 and
17 NTU. There are two readings outside of that range, that meet or exceed, the definition for
turbidity in a stream. In December, YADSYR2 was measured at a value equal to the NC WQS of
50 NTU. Samplers did note that December’s sampling occurred prior to measurable precipitation.
Also in December, site YADYR1 recorded an exceedance of 65 NTU for turbidity. This reading
correlates with the shallow Secchi reading, discussed in an earlier section of this report. High
turbidity and shallow Secchi are both recorded during a time the sand dredge was in operation.
There were no other signs of exceedances for turbidity during this study when the dredge was
not in operation. Analytical results for turbidity, TDS, MBAS and hardness are summarized in
Table 6. MABS and Hardness were collected at the surface, and Turbidity and TDS were sampled
at depth per protocol.

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Water Sciences Section Intensive Survey Branch
Table 6. Turbidity, TDS, MBAS and Hardness Data Summary
Station
ID
Date
(m/d/y)
Turbidity
(NTU)
TDS
(mg/L)
MBAS
(mg/L)
Hardness
(mg/L)
YADYR1_SUR 10/26/2023 NS NS 0.1U 25
YADYR1_SUR 11/27/2023 NS NS 0.1U 26
YADYR1_SUR 12/13/2023 NS NS 0.1U 24
YADSY2_SUR 10/26/2023 NS NS 0.1U 35
YADSY2_SUR 11/27/2023 NS NS 0.1U 29
YADSY2_SUR 12/13/2023 NS NS 0.1U 24
YADSDC3_SUR 10/26/2023 NS NS 0.1U 56
YADSDC3_SUR 11/27/2023 NS NS 0.1U 55
YADSDC3_SUR 12/13/2023 NS NS 0.1U 41
YADDC4_SUR 10/26/2023 NS NS 0.1U 35
YADDC4_SUR 11/27/2023 NS NS 0.1U 39
YADDC4_SUR 12/13/2023 NS NS 0.1U 39
YADYR1 10/26/2023 4.3 61 NS NS
YADYR1 11/27/2023 6.8 55 NS NS
YADYR1 12/13/2023 65 71 NS NS
YADSY2 10/26/2023 17 65 NS NS
YADSY2 11/27/2023 7.7 66 NS NS
YADSY2 12/13/2023 50 81 NS NS
YADSDC3 10/26/2023 5.2 100 NS NS
YADSDC3 11/27/2023 5.8 112 NS NS
YADSDC3 12/13/2023 37 102 NS NS
YADDC4 10/26/2023 1.8 83 NS NS
YADDC4 11/27/2023 4.3 80 NS NS
YADDC4 12/13/2023 10 104 NS NS
Qualifier Codes:
U: Indicates that the analyte was analyzed for, but not detected above, the reported PQL.

*Exceedances of North Carolina Water Quality Standards for Surface Waters in bold and shaded.
NS= Not Sampled
Emerging Compounds
As part of DWR’s ongoing effort to expand screening of public water supply waters for emerging
compounds, 1,4-dioxane and per- and polyfluoroalkyl substances (PFAS) was included in this UAS.
While these compounds do not currently have federal water quality standards, DWR has
established 1,4-dioxane in-stream target values (ITVs) of 0.35 µg/L in surface waters classified as
water supplies and 80 µg/L in all other surface waters. For more information on managing
emerging compounds in water, please visit the North Carolina Department of Environmental
Quality webpage on Emerging Compounds.
Only two samples were detected above the current 1,4-dioxane PQL of 1.0 µg/L, both at station
YADSY2. On 10/26/2023 1,4-dioxane results were 1.7 µg/L and on 11/27/2023 they were
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Water Sciences Section Intensive Survey Branch
1.4 µg/L. Analytical results for all PFAS compounds detected at or above their respective PQLs are
summarized in Table 7. A complete list of all PFAS compounds investigated during this UAS is
presented in Table 8.
Table 7. PFAS Data Summary
Station
ID
Date
(m/d/y) Analyte Result
(ng/L)
YADYR1 10/26/2023 PFBS 2.3 Y
YADYR1 10/26/2023 PFHxA 2.1 Y
YADYR1 10/26/2023 PFOS 2.6 Y
YADYR1 11/27/2023 PFHBA 2.7 J1
YADYR1 11/27/2023 PFBS 2.7
YADYR1 11/27/2023 PFHxA 2.8
YADYR1 11/27/2023 PFOS 3.5
YADYR1 11/27/2023 PFPeA 2.7
YADYR1 12/13/2023 PFBA 2.5 J1
YADYR1 12/13/2023 PFBS 2.1
YADYR1 12/13/2023 PFHxA 2.1
YADYR1 12/13/2023 PFOA 2.3
YADYR1 12/13/2023 PFOS 3.5
YADYR1 12/13/2023 PFPeA 2.2
YADSY2 10/26/2023 PFBS 2.2
YADSY2 10/26/2023 PFHxA 2.4
YADSY2 10/26/2023 PFOS 2.3
YADSY2 10/26/2023 PFPeA 3.0
YADSY2 11/27/2023 PFBS 2.0
YADSY2 11/27/2023 PFHxA 2.2
YADSY2 11/27/2023 PFOS 1.9
YADSY2 11/27/2023 PFPeA 2.7
YADSY2 12/13/2023 PFBA 2.1 J1
YADSY2 12/13/2023 PFOS 2.3
YADSY2 12/13/2023 PFPeA 2.0
YADSC3 10/26/2023 PFBS 3.9
YADSC3 10/26/2023 PFOS 2.3
YADSC3 11/27/2023 PFBS 5.7
YADSC3 11/27/2023 PFOS 1.9
YADSC3 12/13/2023 PFBS 6.1
YADSC3 12/13/2023 PFOS 1.9
YADDC4 10/26/2023 PFOS 2.0
Qualifier Codes:
Y: Elevated PQL due to insufficient sample size.
J1: Surrogate recovery limits have been exceeded.

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Water Sciences Section Intensive Survey Branch
Table 8. List of PFAS Compounds

ABBREVIATION NAME CAS #
HFPO-DA (GENX) Perfluoro-2-methyl-3-oxahexanoic acid 13252-13-6
PFOS Perfluorooctanesulfonic acid 1763-23-1
PFUNA Perfluoroundecanoic acid 2058-94-8
N-MEFOSAA 2-(N- Methylperfluorooctanesulfonamido)acetic acid 2355-31-9
PFPEA Perfluoropentanoic acid 2706-90-3
PFPES Perfluoropentanesulfonic acid 2706-91-4
6:2 FTS 6:2 Fluorotelomer sulfonic acid 27619-97-2
N-ETFOSAA 2-(N- Ethylperfluorooctanesulfonamido)acetic acid 2991-50-6
PFHXA Perfluorohexanoic acid 307-24-4
PFDOA Perfluorododecanoic acid 307-55-1
PFOA Perfluorooctanoic acid 335-67-1
PFDA Perfluorodecanoic acid 335-76-2
PFDS Perfluorodecanesulfonic acid 35-377-3
PFHXS Perfluorohexanesulfonic acid 355-46-4
PFBA Perfluorobutanoic acid 375-22-4
PFBS Perfluorobutanesulfonic acid 375-73-5
PFHPA Perfluoroheptanoic acid 375-85-9
PFHPS Perfluoroheptanesulfonic acid 375-92-8
PFNA Perfluorononanoic acid 375-95-1
PFTEDA Perfluorotetradecanoic acid 376-06-7
8:2 FTS 8:2 Fluorotelomer sulfonic acid 39108-34-4
PFNS Perfluorononanesulfonic acid 68259-12-1
PFTRDA Perfluorotridecanoic acid 72629-94-8
9CL-PF3ONS 9-chlorohexadecafluoro-3-oxanonane-1-sulfonic acid 756426-58-1
4:2 FTS 4:2 Fluorotelomer sulfonic acid 757124-72-4
11CL-PF3OUDS 11-chloroeicosafluoro-3-oxaundecane-1-sulfonic acid 763051-92-9
PFDOS Perfluorododecane sulfonic acid 79780-39-5
ADONA 4,8-Dioxa-3H-perfluorononanoicacid 919005-14-4
PFEESA/PES Perfluoro(2-ethoxyethane)sulphonic acid 113507-82-7
PMPA Perfluoro-2-methoxypropanoic acid 13140-29-9
PFECA B OR NFHDA Perfluoro-3,6-dioxaheptanoic acid 151772-58-6
R-PSDA (NAFION
BYPRODUCT 4)
Perfluoro-4-(2-sulfoethoxy)pentanoic acid 2416366-18-0
HYDROLYZED PSDA
(NAFION BYPRODUCT 5)
2-fluoro-2-[1,1,2,3,3,3-hexafluoro-2-(1,1,2,2-
tetrafluoro-2-sulfoethoxy)propoxy]-acetic acid
2416366-19-1
R-PSDCA (NAFION
BYPRODUCT 6)
1,1,2,2-tetrafluoro-2-[1,2,2,3,3-pentafluoro-1-
(trifluoromethyl)propoxy] ethanesulfonic acid
2416366-21-5
R-EVE 4-(2-carboxy-1,1,2,2-tetrafluoroethoxy)-2,2,3,3,4,5,5,5-
octafluoro-pentanoic acid
2416366-22-6
PEPA Perfluoro-2-ethoxypropanoic acid 267239-61-2
PFESA-BP1 (NAFION
BYPRODUCT 1)
Perfluoro-3,6-dioxa-4-methyl-7-octenesulfonic acid 29311-67-9
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Water Sciences Section Intensive Survey Branch
ABBREVIATION NAME CAS #
PFO2HXA Perfluoro (3,5-dioxahexanoic) acid 39492-88-1
PFO3OA Perfluoro (3,5,7-trioxaoctanoic) acid 39492-89-2
PFO4DA Perfluoro (3,5,7,9-tetraoxadecanoic) acid 39492-90-5
PFO5DA Perfluoro(3,5,7,9,11-pentaoxadodecanoic) acid 39492-91-6
PFMOAA Perfluoro-2-methoxyacetic acid 674-13-5
EVE ACID 2,2,3,3-tetrafluoro-3-({1,1,1,2,3,3-hexafluoro-3-[(1,2,2-
trifluoroethenyl)oxy]propan-2- yl}oxy)propionic acid
69087-46-3
PFESA-BP2 (NAFION
BYPRODUCT 2)
7H-Perfluoro-4-Methyl-3,6-Dioxaoctanesulfonic Acid 749836-20-2
HYDRO-EVE ACID 2,2,3,3-Tetrafluoro-3-{[1,1,1,2,3,3-hexafluoro-3-
(1,2,2,2-tetrafluoroethoxy)propan-2-yl]oxy}propanoic
acid
773804-62-9
NVHOS Perfluoroethoxysulfonic acid 801209-99-4
PFECA G 4-(Heptafluoroisopropoxy)hexafluorobutanoic acid 801212-59-9

Metals
Chemical analyses for both total and dissolved metals from samples collected from the Yadkin
River, South Yadkin River, and associated tributaries, did not result in any values above NC WQS
for surface waters classified as WS-IV. Detections of barium, calcium, iron, potassium,
magnesium, manganese, and sodium are considered naturally occurring and were not detected
at concentrations considered problematic to this reclassification. Analytical results for total and
dissolved metals are summarized in Tables 9 and 10.
15
Water Sciences Section Intensive Survey Branch

Table 9. Total Metals Data Summary
Station
ID
Date
(m/d/y)
Ag
(µg/L)
As
(µg/L)
Ba
(µg/L)
Be
(µg/L)
Cd
(µg/L)
Cr
(µg/L)
Cu
(µg/L)
Hg*
(ng/L)
Mg*
(mg/L)
Mn
(µg/L)
Ni
(µg/L)
Pb
(µg/L)
Sb
(µg/L)
Se
(µg/L)
Tl
(µg/L)
Zn
(µg/L)
YADYR1_SUR 10/26/23 1.0 U 2.0 U 16 5.0 U 0.50 U 5.0 U 2.0 U 1.09 2.3 19 2.0 U 2.0 U 10 U 1.0 U 2.0 U 10 U
YADSY2_SUR 10/26/23 1.0 U 2.0 U 27 5.0 U 0.05 U 5.0 U 2.0 U 1.54 3.1 68 2.0 U 2.0 U 10 U 1.0 U 2.0 U 10 U
YADSC3_SUR 10/26/23 1.0 U 2.0 U 33 5.0 U 0.50 U 5.0 U 2.0 U 1.00 U 4.6 180 2.0 U 2.0 U 10 U 1.0 U 2.0 U 10 U
YADDC4_SUR 10/26/23 1.0 U 2.0 U 60 5.0 U 0.50 U 5.0 U 2.0 U 1.00 U 3.0 37 2.0 U 2.0 U 10 U 1.0 U 2.0 U 10 U
YADYR1_SUR 11/27/23 1.0 U 2.0 U 22 5.0 U 0.50 U 5.0 U 2.0 U 1.21 2.4 34 2.0 U 2.0 U 10 U 1.0 U 2.0 U 10 U
YADSY2_SUR 11/27/23 1.0 U 2.0 U 26 5.0 U 0.50 U 5.0 U 2.0 U 1.00 U 3.1 48 2.0 U 2.0 U 10 U 1.0 U 2.0 U 10 U
YADSC3_SUR 11/27/23 1.0 U 2.0 U 35 5.0 U 0.50 U 5.0 U 2.0 U 1.24 5.0 150 2.0 U 2.0 U 10 U 1.0 U 2.0 U 10 U
YADDC4_SUR 11/27/23 1.0 U 2.0 U 60 5.0 U 0.50 U 5.0 U 2.0 U 1.18 3.4 48 2.0 U 2.0 U 10 U 1.0 U 2.0 U 10 U
YADYR1_SUR 12/13/23 1.0 U 2.0 U 33 5.0 U 0.50 U 5.0 U 3.1 5.97 2.1 61 2.0 U 2.0 U 10 U 1.0 U 2.0 U 10 U
YADSY2_SUR 12/13/23 1.0 U 2.0 U 38 5.0 U 0.50 U 5.0 U 2.2 4.41 2.6 88 2.0 U 2.0 U 10 U 1.0 U 2.0 U 10 U
YADSC3_SUR 12/13/23 1.0 U 2.0 U 53 5.0 U 0.50 U 5.0 U 2.0 U 2.90 4.1 160 2.0 U 2.0 U 10 U 1.0 U 2.0 U 10 U
YADDC4_SUR 12/13/23 1.0 U 2.0 U 70 5.0 U 0.50 U 5.0 U 2.0 U 1.65 3.7 61 2.0 U 2.0 U 10 U 1.0 U 2.0 U 10 U
* All metals concentrations are reported in µg/L except Mg which is reported in mg/L, and Hg which is reported in ng/L
Qualifier Codes:
U: Indicates that the analyte was analyzed for, but not detected above, the reported PQL.

16
Water Sciences Section Intensive Survey Branch
Table 10. Dissolved Metals Data Summary
Station
ID
Date
(d/m/y)
Ag
(µg/L)
Be
(µg/L)
Cd
(µg/L)
Cr
(µg/L)
Cu
(µg/L)
Mg*
(mg/L)
Mn
(µg/L)
Sb
(µg/L)
Pb
(µg/L)
Se
(µg/L)
Tl
(µg/L)
Zn
(µg/L)
YADYR1_DISS1 10/26/23 1.0 U 5.0 U 0.50 U 5.0 U 2.0 U 2.1 16 10 U 2.0 U 1.0 U 2.0 U 10 U
YADYR1_DISS2 10/26/23 1.0 U 5.0 U 0.50 U 5.0 U 2.0 U 2.3 21 10 U 2.0 U 1.0 U 2.0 U 10 U
YADSY2_DISS1 10/26/23 1.0 U 5.0 U 0.50 U 5.0 U 2.0 U 3.0 51 10 U 2.0 U 1.0 U 2.0 U 10 U
YADSY2_DISS2 10/26/23 1.0 U 5.0 U 0.50 U 5.0 U 2.0 U 3.0 50 10 U 2.0 U 1.0 U 2.0 U 10 U
YADSC3_DISS1 10/26/23 1.0 U 5.0 U 0.50 U 5.0 U 2.0 U 4.5 170 10 U 2.0 U 1.0 U 2.0 U 10 U
YADSC3_DISS2 10/26/23 1.0 U 5.0 U 0.50 U 5.0 U 2.0 U 4.5 170 10 U 2.0 U 1.0 U 2.0 U 10 U
YADDC4_DISS1 10/26/23 1.0 U 5.0 U 0.50 U 5.0 U 2.0 U 2.9 33 10 U 2.0 U 1.0 U 2.0 U 10 U
YADDC4_DISS2 10/26/23 1.0 U 5.0 U 0.50 U 5.0 U 2.0 U 2.9 33 10 U 2.0 U 1.0 U 2.0 U 10 U
YADYR1_DISS1 11/27/23 1.0 U 5.0 U 0.50 U 5.0 U 2.0 U 2.3 26 10 U 2.0 U 1.0 U 2.0 U 10 U
YADYR1_DISS2 11/27/23 1.0 U 5.0 U 0.50 U 5.0 U 2.0 U 2.2 25 10 U 2.0 U 1.0 U 2.0 U 10 U
YADSY2_DISS1 11/27/23 1.0 U 5.0 U 0.50 U 5.0 U 2.0 U 3.0 37 10 U 2.0 U 1.0 U 2.0 U 10 U
YADSY2_DISS2 11/27/23 1.0 U 5.0 U 0.50 U 5.0 U 2.0 U 3.0 39 10 U 2.0 U 1.0 U 2.0 U 10 U
YADSC3_DISS1 11/27/23 1.0 U 5.0 U 0.50 U 5.0 U 2.0 U 4.9 140 10 U 2.0 U 1.0 U 2.0 U 10 U
YADSC3_DISS2 11/27/23 1.0 U 5.0 U 0.50 U 5.0 U 2.0 U 4.8 140 10 U 2.0 U 1.0 U 2.0 U 10 U
YADDC4_DISS1 11/27/23 1.0 U 5.0 U 0.50 U 5.0 U 2.0 U 3.3 38 10 U 2.0 U 1.0 U 2.0 U 10 U
YADDC4_DISS2 11/27/23 1.0 U 5.0 U 0.50 U 5.0 U 2.0 U 3.3 36 10 U 2.0 U 1.0 U 2.0 U 10 U
YADYR1_DISS1 12/13/23 1.0 U 5.0 U 0.50 U 5.0 U 2.2 1.9 19 10 U 2.0 U 1.0 U 2.0 U 10 U
YADYR1_DISS2 12/13/23 1.0 U 5.0 U 0.50 U 5.0 U 2.0 U 1.9 12 10 U 2.0 U 1.0 U 2.0 U 10 U
YADSY2_DISS1 12/13/23 1.0 U 5.0 U 0.50 U 5.0 U 2.0 U 2.5 62 10 U 2.0 U 1.0 U 2.0 U 10 U
YADSY2_DISS2 12/13/23 1.0 U 5.0 U 0.50 U 5.0 U 2.0 U 2.5 44 10 U 2.0 U 1.0 U 2.0 U 10 U
YADSC3_DISS1 12/13/23 1.0 U 5.0 U 0.50 U 5.0 U 2.0 U 4.0 120 10 U 2.0 U 1.0 U 2.0 U 10 U
YADSC3_DISS2 12/13/23 1.0 U 5.0 U 0.50 U 5.0 U 2.0 U 4.0 130 10 U 2.0 U 1.0 U 2.0 U 10 U
YADDC4_DISS1 12/13/23 1.0 U 5.0 U 0.50 U 5.0 U 2.0 U 3.5 56 10 U 2.0 U 1.0 U 2.0 U 10 U
YADDC4_DISS2 12/13/23 1.0 U 5.0 U 0.50 U 5.0 U 2.0 U 3.5 58 10 U 2.0 U 1.0 U 2.0 U 10 U
*All metals concentrations are reported in µg/L except Mg, which is reported in mg/L
Qualifier Codes:
U: Indicates that the analyte was analyzed for, but not detected above, the reported PQL.

17
Water Sciences Section Intensive Survey Branch
Pesticides, Herbicides, Volatile and Semi-Volatile Organic Compounds
Chemical analyses for organochlorine, organonitrogen and organophosphorus pesticides, as well
as acid herbicides, volatile and semi-volatile organic compounds did not result in any values that
exceeded their respective PQLs. There is one value qualified with a lab error and has been
rejected from the summary. The total number of analytes for these chemical classes is
summarized in Table 11. A complete list of individual analytes is available on request.

Table 11. Pesticides, Herbicides, Volatile & Semi-Volatile Organic Compounds
Chemical Class
YADYR1_SUR
10/26/2023
11/27/2023
12/13/2023
YADYR2_SUR
10/26/2023
11/27/2023
12/13/2023
YADYR3_SUR
10/26/2023
11/27/2023
12/13/2023
YADYR4_SUR
10/26/2023
11/27/2023
12/13/2023
Chlorinated
Pesticides
All 31 compounds
undetected (U)
All 31 compounds
undetected (U)
All 31 compounds
undetected (U)
All 31 compounds
undetected (U)
Phosphorus Based
Pesticides
All 10 compounds
undetected (U)
All 10 compounds
undetected (U
All 10 compounds
undetected (U)
All 10 compounds
undetected (U)
Nitrogen Based
Pesticides
All 12 compounds
undetected (U)
All 12 compounds
undetected (U)
All 12 compounds
undetected (U)
All 12 compounds
undetected (U)
Acid Herbicides * No Positive Results
Detected
No Positive Results
Detected
No Positive Results
Detected
No Positive Results
Detected
Semi Volatile
Organics (BNAs)
All 66 compounds
undetected (U)
All 66 compounds
undetected (U)
All 66 compounds
undetected (U)
All 66 compounds
undetected (U)
Volatile Organics
(VOAs)
All 60 compounds
undetected (U)
All 60 compounds
undetected (U)
All 60 compounds
undetected (U)
All 60 compounds
undetected (U)
*Analysis Preformed by GEL Laboratories Charleston, SC, 2040 Savage Road, Charleston, SC 29407

Conclusion:
Based on the physical in situ values observed in the field, as well as results of laboratory analyses
for all parameters detailed in the tables included herein; portions of the South Yadkin River,
Second Creek, Beaverdam Creek, and Fourth Creek, in the designated study area as observed
during the period of October 26, 2023 to December 13, 2023, met the WS-IV (CA) and WS-IV
standards. Turbidity was the only exceedance recorded, and it was found in less than 50% of
samples collected. It is not anticipated that this exceedance would prohibit effective treatment
of the resulting resource or prevent it from meeting the proposed classification of WS-IV.
Intensive Survey Branch always recommends implementation of a continued monitoring plan
where applicable.
For further questions regarding this or other studies, please contact [e-mail].
Full datasets will be made available upon request.