2019-05-15 Duke Mayo Gyp Pad Assessment Work Plan_20190515

DUKE
ENERGY
May 15, 2019
North Carolina Department of Environmental Quality
Water Quality Regional Operations
3800 Barrett Drive
1628 Mail Service Center
Raleigh, North Carolina 27699
Attn: Mr. Eric Rice (submitted electronically)
Re: Mayo Steam Electric Plant Gypsum Pad
Groundwater Assessment Work Plan
Mayo Steam Electric Plant
10660 Boston Road
Roxboro, North Carolina 27574
Dear Mr. Rice-
2500 Fairfax Road
Greensboro, North Carolina 27407
336-215-4576
As indicated in a letter from the North Carolina Department of Environmental Quality (NCDEQ) dated
September 8, 2017 (Zimmerman to Sullivan), it is understood that in addition to requirements of the Coal
Ash Management Act (CAMA), Duke Energy is bound by the requirements of the North Carolina
General Statutes and North Carolina Administrative Code 02L. Therefore, Duke Energy is required to
assess soil and groundwater in areas where there is a potential for groundwater impact. Pursuant to
technical direction provided in the September 8, 2017 letter and additional clarification in correspondence
from NCDEQ dated April 5, 2019, the gypsum pad at the Duke Energy Mayo Steam Electric Plant
(Mayo) requires completion of a Comprehensive Site Assessment (CSA) submitted to NCDEQ no later
than March 31, 2020.
Duke Energy is submitting the attached Gypsum Pad Assessment Work Plan to assess potential
groundwater and soil impacts from the gypsum pad at Mayo. Upon concurrence with this work plan,
Duke Energy will pursue receipt of necessary permits for the installation of 15 proposed groundwater
monitoring wells and perform associated sampling and analysis for the gypsum pad.
Call or email me at 336-215-4576 or kimberlee.witt(&duke-energy com if you need additional
information.
Regards,
'#6:, 4,
0�#—
Kimberlee Witt, PE
Environmental Services
Attachments: Gypsum Pad Assessment Work Plan (SynTerra May 2019)
cc: Coal Ash War Room — NCDEQ
Mayo Gypsum Pad Page 1 of 2

Rick Bolich - NCDEQ
Eric Smith - NCDEQ
Steve Lanter - NCDEQ
Ed Sullivan — Duke Energy
Jerry Wylie - SynTerra
Mayo Gypsum Pad Page 2 of 2

,61P
synTerra
GYPSUM PAD
ASSESSMENT WORK PLAN
MAYO STEAM ELECTRIC PLANT
10660 BOSTON ROAD
ROXBORO, NC 27574
MAY 2019
PREPARED FOR
f
' DUKE
ENERGY
DUKE ENERGY PROGRESS, LLC
Jer.y A. ylie,, N LG 1425
Project Manager
Peggy W. Altman
Project Scientist

Gypsum Pad Assessment Work Plan May 2019
Mayo Steam Electric Plant SynTerra
TABLE OF CONTENTS
SECTION
PAGE
1.0 INTRODUCTION.........................................................................................................1-1
1.1 Regulatory Background...........................................................................................1-1
1.2 Site Description.........................................................................................................1-1
2.0 GYPSUM PAD ASSESSMENT OBJECTIVES........................................................2-1
2.1 Soil Assessment......................................................................................................... 2-1
2.2 Groundwater Assessment........................................................................................ 2-1
3.0 GYPSUM PAD ASSESSMENT REPORT.................................................................3-1
LIST OF FIGURES
Figure 1 Site Location Map
Figure 2 Proposed Monitoring Well and Soil Boring Locations
LIST OF TABLES
Table 1 Soil Sample Analytical Methods
Table 2 Proposed Soil Samples and Monitoring Wells
Table 3 Groundwater Analytical Methods
Page i

Gypsum Pad Assessment Work Plan May 2019
Mayo Steam Electric Plant SynTerra
1.0 INTRODUCTION
Duke Energy Progress, LLC (Duke Energy) owns and operates the coal-fired Mayo
Steam Electric Plant (Mayo, Plant, or Site) located in a rural area approximately 10
miles north of the City of Roxboro in Person County, North Carolina (Figure 1). Duke
Energy owns the Site property, which is roughly bisected by US Highway 501,
encompasses 460 acres, and includes the power plant, ash basin, material storage,
industrial landfill, and other operational features associated with coal-fired power
generating facilities.
Proposed groundwater and soil assessment activities for the gypsum pad is described
herein.
1.1 Regulatory Background
In 2014, The North Carolina General Assembly passed the Coal Ash Management Act
(CAMA). CAMA required owners of a coal combustion residual (CCR) surface
impoundment to conduct detailed assessment of Site groundwater within and around
the CCR surface impoundment.
As indicated in a letter from the North Carolina Department of Environmental Quality
(DEQ) dated September 8, 2017 (Zimmerman to Sullivan), it is understood that in
addition to CAMA requirements, Duke Energy is also bound by the rules and
requirements of the NC General Statutes and NC Administrative Code 02L. These
provide requirements for the assessment and abatement of soil and groundwater
impacts resulting from Site activities.
Therefore, Duke Energy is required to assess soil and groundwater in areas where there
is a potential for groundwater impact. Pursuant to technical direction provided in the
September 8, 2017 letter, NCDEQ requested assessment of the gypsum pad at Mayo.
1.2 Site Description
Detailed descriptions of the Site operational history, the Site conceptual model, physical
setting and features, geology/hydrogeology, and results of the findings of the
Comprehensive Site Assessment (CSA) and other CAMA-related works are
documented in full in the following documents:
• Comprehensive Site Assessment Report —Mayo Steam Electric Plant (SynTerra,
September 2, 2015)
• Corrective Action Plan Part 1 —Mayo Steam Electric Plant (SynTerra,
December 1, 2015)
Page 1-1

Gypsum Pad Assessment Work Plan May 2019
Mayo Steam Electric Plant SynTerra
• Corrective Action Plan Part 2— Mayo Steam Electric Plant (SynTerra, February 2,
2016)
• Comprehensive Site Assessment Supplement 1 —Mayo Steam Electric Plant
(SynTerra, July 7, 2016)
• Comprehensive Site Assessment Update — Mayo Steam Electric Plant (SynTerra,
October 31, 2017)
The gypsum pad at Mayo Plant is not discussed in detail in the documents described
above. The unit is located in the central portion of the Plant south of the ash basin
(Figure 1). The gypsum pad is approximately two acres and was put into operation in
May 2009 to contain and temporarily store synthetic gypsum generated by the Plant's
flue gas desulfurization (FGD) scrubbing process. A synthetic liner was installed in the
footprint of the gypsum pad in 2016. The gypsum pad is bounded to the north and east
by internal Plant access roads and buildings as well as the Plant railroad line. The pad is
bounded to the west and south by the coal pile and internal Plant access roads.
The gypsum pad appears to be positioned in a separate flow regime from the ash basin
area. Hydrogeological interpretation based on previous Site assessment activities
indicates that a groundwater divide is present roughly correlated with the ridge upon
which the Plant railroad is constructed. Groundwater flows to the west and north on
the west side of the ridge, and groundwater flows to the east towards Mayo Reservoir
on the east side of the ridge. The gypsum pad area does not appear to be coincident to
nor flow into the ash basin. However, given its historical use and the potential for CCR
impacts from this unit, groundwater and soil assessment will be conducted as required
by 02L. Groundwater flow will be evaluated as part of this proposed assessment work.
Page 1-2

Gypsum Pad Assessment Work Plan May 2019
Mayo Steam Electric Plant SynTerra
2.0 GYPSUM PAD ASSESSMENT OBJECTIVES
Objectives of the gypsum pad assessment include the following:
• Characterize inorganic constituents associated with source area (gypsum pad)
soils
• Compare inorganic constituent concentrations in source area soils with
Site background soils
• Characterize inorganic constituent concentrations in groundwater underlying
the source area and just beyond the source area perimeter
Compare inorganic constituent concentrations in source area groundwater
with Site background groundwater
2.1 Soil Assessment
Gypsum pad area soils will be sampled and analyzed for inorganic parameters to
determine if they are a source of CCR constituents that may leach into underlying
groundwater in excess of NC 02L standards or Site provisional background threshold
values (PBTV). Soil samples will be collected at proposed monitoring well locations as
part of well installation activities. Soil analytical procedures are provided in Table 1.
The proposed locations of the monitoring wells are included in Figure 2. Proposed
locations are approximate and may vary slightly based on field observations and
locations of underground utilities, which will be determined prior to initiation of boring
activities.
Synthetic Precipitation Leaching Procedure (SPLP) samples for inorganics analysis will
be collected at a frequency of two per well cluster location with one unsaturated sample
collected from near ground surface (two to three feet) and a saturated sample collected
two to three feet below the water table (Table 2).
2.2 Groundwater Assessment
Groundwater conditions proximate to the area of investigation will be assessed by
installing groundwater monitoring wells in and around the gypsum pad and
collecting/analyzing representative groundwater samples from the wells.
A maximum total of 15 gypsum pad assessment groundwater monitoring wells (GYP)
is proposed to be installed to characterize groundwater conditions at their respective
locations. Five well clusters, each consisting of a shallow ("S"), transition zone ("D"),
and bedrock ("BR") groundwater monitoring well (GYP-1S/D/BR, GYP-2S/D/BR, GYP -
Page 2-1

Gypsum Pad Assessment Work Plan May 2019
Mayo Steam Electric Plant SynTerra
3S/D/BR, GYP- 4S/D/BR, GYP-5S/D/BR), are planned to be installed at the proposed
locations shown in Figure 2.
Well locations may be modified from those shown on Figure 2 based on field
constraints (e.g. underground utility locations, rig stability). Further, based on field
conditions, it is possible that saturated conditions will not be encountered at all well
locations; therefore, a lower number of wells may actually be installed.
Well installation procedures and well construction materials and lengths will be
consistent with ongoing CAMA assessment activities in accordance with the approved
Proposed Groundwater Assessment Work Plan (Rev. 1) (SynTerra, 2014). The primary
drilling technology for soil sampling, well drilling, and well installation with either be
rotary sonic drilling or a combination of air rotary and hollow stem auger drilling.
Anticipated well depths are provided in Table 2. Groundwater samples will be
analyzed for field parameters (e.g., pH, conductivity, and turbidity) and inorganic
constituents consistent with ongoing CAMA assessment activities (Table 3).
Page 2-2

Gypsum Pad Assessment Work Plan May 2019
Mayo Steam Electric Plant SynTerra
3.0 GYPSUM PAD ASSESSMENT REPORT
An assessment report will be prepared after soil and groundwater sample analytical
data is received, validated, and evaluated.
Components of the report will include:
1) Brief Site History
2) Description of Source Assessment Activities
3) Observations Concerning Geology and Hydrogeology in Areas of
Additional Assessment
4) Soil Analytical Results
5) Groundwater Analytical Results
6) Site Conceptual Model
7) Conclusions and Recommendations
Page 3-1

Gypsum Pad Assessment Work Plan May 2019
Mayo Steam Electric Plant
FIGURES
SynTerra

VIRGINIA.- _-'
NORTH CAROLINA-,
� u
MAYO STEAM ASH BASIN COMPLIANCE •;a ! p �'
ELECTRIC PLANT BOUNDARY Hwy,
� PARCEL LINE
! J r
if FAQ
APPROXIMATE ASH BASIN .
...JJJ WASTE BOUNDARY
100' RIGHT-OF-WAY
i } i/ \ I i ♦ r^ WASTE WATER
-\5 G_ /I /`♦—TREATMENT BASIN
SIG l I
CCPMONOFILL
APPROXIMATE FUTURE
(SEE NOTE
S
r�eShrJ ]HiA ' a . , • , ,
NOTES:,
2017 USGS TOPOGRAPHIC MAP, QUADRANGLE NAME, CLUSTER SPRINGS, QUAD I
36078E8, QUADRANGLE, OBTAINED FROM ARCGIS ONLINE, APRIL 25, 2019.
��_ •r.J
} •'
r __ �� ll_
-
AREA OF INVESTIGATION THAT DETERMINED SETTLED CCR MATERIAL
IS NOT PRESENT IN THIS AREA OF THE ASH BASIN. A FUTURE
J
--, •
/�
j
'++ � 4LJ.i
__- \J `T •,
� .. �-
st.6'
REPRESENTATIVE ASH BASIN WASTE AND COMPLIANCE BOUNDARY
IS INCLUDED IN THE MAYO NPDES PERMIT NCO038377 PART I, 5.A.(18.)-
1
'r.
ATTACHMENTA FIGURE 1 ANDATTACHMENT B FIGURE 1.1 DATED JULY 13, 2018.
PERSON COUNTY
FIGURE 1
*' SITE LOCATION MAP
synTerra W/NSTON-SALEM GYPSUM PAD ASSESSMENT WORK PLAN
• RALEI H MAYO STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC
DUKE CHARLOTTE ROXBORO, NORTH CAROLINA
ENERGY DRAWN BY: A. ROBINSON DATE:4/2G/2019 1,000 0 1,000 2,000
PROGRESS PROJECT MANAGER: J. WYLIE CONTOUR INTERVAL: 201 GRAPHIC SCALE IN FEET
CHECKED BY: P. ALTMAN MAP DATE: 2016

�. . GYP-4 ♦�♦ -GYP-1... ,. �... _'�,`'S-•-;�; - -
�! ♦ / ` :.fir : '
GYP-5 x!
GYP-2
� ram:. � is •.Y _
. -..♦� � t I it _ "ice'^•
.: a ; ' �. GYP-3 ■• `�-� � -.
oo
-2_
�r a . �.
SOURCE: AERIAL PHOTOGRAPHY OBTAINED FROM GOOGLE EARTH PRO, DATED 1011412013. J
LEGEND GRAPHIC SCALE FIGURE 2
50 25 0 50 100 PROPOSED MONITORING
PROPOSED MONITORING WELL �%^ IN FEET
synTerra WELLS AND SOIL BORING LOCATIONS
0 GYPSUM PAD GR RIVERSTREET,SUITE
GREENVILLE,SOUTHCAROLINLINA29601 GYPSUM PAD ASSESSMENT WORK PLAN
0 ASPHALT PAVEMENT PHONE[phone] MAYO STEAM ELECTRIC PLANT
ASPHALT SURFACING 'DUKE DRAWN BY: A.ROBI'llNSON DATE:05/10/2019 DUKE ENERGY PROGRESS, LLC
APPROXIMATE ASH BASIN COMPLIANCE ENERGY CHECKED BY:PROJECT P. LTMAN LIE ROXBORO, NORTH CAROLINA
BOUNDARY PROGRESS
P:\Duke Ener Pro ress.1026\00 GIS BASE DATA Ma o\Ma Docs\Pro osal Sam lin 201610271G sumPile.mxd

Gypsum Pad Assessment Work Plan May 2019
Mayo Steam Electric Plant
Tables
SynTerra

TABLE 1
SOIL SAMPLE ANALYTICAL METHODS
GYPSUM PAD ASSESSMENT WORK PLAN
MAYO STEAM ELETRIC PLANT
DUKE ENERGY PROGRESS LLC, ROXBORO, NC
INORGANIC COMPOUNDS
UNITS
METHOD
Aluminum
mg/kg
EPA 6010D
Antimony
mg/kg
EPA 6020B
Arsenic
mg/kg
EPA 6020B
Barium
mg/kg
EPA 6010D
Beryllium
mg/kg
EPA 6010D
Boron
mg/kg
EPA 6010D
Cadmium
mg/kg
EPA 6020B
Calcium
mg/kg
EPA 6010D
Chloride
mg/kg
EPA 9056A
Chromium
mg/kg
EPA 6010C
Cobalt
mg/kg
EPA 6020A
Copper
mg/kg
EPA 6010C
Iron
mg/kg
EPA 6010C
Lead
mg/kg
EPA 6020B
Magnesium
mg/kg
EPA 6010D
Manganese
mg/kg
EPA 6010C
Mercury
mg/kg
EPA 7471B
Molybdenum
mg/kg
EPA 6010D
Nickel
mg/kg
EPA 6010C
Nitrate as Nitrogen
mg/kg
EPA 9056A
pH
SU
EPA 9045D
Potassium
mg/kg
EPA 6010D
Selenium
mg/kg
EPA 6020B
Sodium
mg/kg
EPA 6010D
Strontium
mg/kg
EPA 6010C
Sulfate
mg/kg
EPA 9056A
Thallium
mg/kg
EPA 6020B
Total Organic Carbon
mg/kg
EPA 9060
Vanadium
mg/kg
EPA 6020B
Zinc
I mg/kg
JEPA 6010C
Prepared by: RBI Checked by: SRW/TCP/VTV
Notes•
1. Soil samples to be analyzed for Total Inorganics using USEPA Methods 6010/6020 and pH using USEPA Method 9045, as noted
above.
2. Soil samples collected from near ground surface (2 to 3ft) and from just above water table (field determined) in each boring will also
be analyzed for leaching potential using SPLP Extraction Method 1312 in conjunction with USEPA Methods 6010/6020
3. Analytical methods and reporting limits as presented were developed for CSA field implementation in 2015. Analytical methods and
reporting limits are updated periodically and applied as appropriate.
meq/100g - millequivalents per 100 grams
mg/kg - Milligrams per kilogram
mV - Millivolts
S.U. - Standard Unit
Page 1 of 1

TABLE 2
PROPOSED SOIL SAMPLES AND MONITORING WELLS
GYPSUM PAD ASSESSMENT WORK PLAN
MAYO STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, ROXBORO, NC
Monitoring
Well ID
Estimated Well
Depth
(feet bgs)
Soil Sample ID
(Estimated Depth
Interval in feet bgs)
Comments
GYP-SB1 (2-3)
Near -surface unsaturated soil sample (water table —20 feet bgs)
GYP-SBl (Various)
Continue soil sampling at 5' intervals until the bottom of unconsolidated material is reached. (i.e., 7-8', 12-13', 17-18', etc.)
GYP-SBl (19-20)
Saturated soil sample (may not apply)
GYP-1S
30
GYP-SBl (25-26)
Soil sample from shallow well screened interval
GYP-1D
50
GYP-SBl (45-46)
Soil sample from deep well screened interval
GYP-1611
80
GYP-SBl (75-76)
Rock sample from bedrock well screened interval
GYP-S132 (2-3)
Near -surface unsaturated soil sample (water table —20 feet bgs)
GYP-S132 (Various)
Continue soil sampling at 5' intervals until the bottom of unconsolidated material is reached. (i.e., 7-8', 12-13', 17-18', etc.)
GYP-SB2 (19-20)
Saturated soil sample (may not apply)
GYP-2S
30
GYP-S132 (25-26)
Unsaturated soil sample
GYP-2D
50
GYP-S132 (45-46)
Soil sample from shallow well screened interval
GYP-2611
80
GYP-SB2 (75-76)
Rock sample from bedrock well screened interval
GYP-S133 (2-3)
Near -surface unsaturated soil sample (water table —20 feet bgs)
GYP-S133 (Various)
Continue soil sampling at 5' intervals until the bottom of unconsolidated material is reached. (i.e., 7-8', 12-13', 17-18', etc.)
GYP-S133 (19-20)
Saturated soil sample (may not apply)
GYP-3S
30
GYP-S133 (25-26)
Unsaturated soil sample
GYP-3D
50
GYP-S133 (45-46)
Soil sample from shallow well screened interval
GYP-3BR
80
GYP-S133 (75-76)
Rock sample from bedrock well screened interval
GYP-SB4 (2-3)
Near -surface unsaturated soil sample (water table —20 feet bgs)
GYP-S134 (Various)
Continue soil sampling at 5' intervals until the bottom of unconsolidated material is reached. (i.e., 7-8', 12-13', 17-18', etc.)
GYP-S134 (19-20)
Saturated soil sample (may not apply)
GYP-4S
30
GYP-S134 (25-26)
Unsaturated soil sample
GYP-4D
50
GYP-S134 (45-46)
Soil sample from shallow well screened interval
GYP-4BR
80
GYP-SB4 (75-76)
Rock sample from bedrock well screened interval
GYP-S135 (2-3)
Near -surface unsaturated soil sample (water table —20 feet bgs)
GYP-S135 (Various)
Continue soil sampling at 5' intervals until the bottom of unconsolidated material is reached. (i.e., 7-8', 12-13', 17-18', etc.)
GYP-SB5 (19-20)
Saturated soil sample (may not apply)
GYP-5S
30
GYP-S135 (25-26)
Unsaturated soil sample
GYP-5D
50
GYP-S135 (45-46)
ISoil sample from shallow well screened interval
GYP-56R
80
GYP-SB5 (75-76)
1 Rock sample from bedrock well screened interval
Notes:
bgs - below ground surface
- Approximately
Estimated well and soil sample depths based on data from the CCR-101S-BG, CCR-101D-13G, and CPA-1 wells.
Number of soil samples is approximate. A shallower water table will result in fewer samples, and a deeper water table will result in additional samples.
SynTerra recommends each well screen be submerged beneath the water table and have a length of at least 10 feet.
Prepared by: PWA Checked by: JAW
Page 1 of 1

TABLE 3
GROUNDWATER ANALYTICAL METHODS
GYPSUM PAD ASSESSMENT WORK PLAN
MAYO STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS LLC, ROXBORO, NC
PARAMETER RL I UNITS METHOD
FIELD PARAMETERS
pH
NA
SU
Field Water Quality Meter
Specific Conductance
NA
µS/cm
Field Water Quality Meter
Temperature
NA
0C
Field Water Quality Meter
Dissolved Oxygen
NA
mg/L
Field Water Quality Meter
Oxidation Reduction Potential
NA
mV
Field Water Quality Meter
Eh
NA
mV
Field Water Quality Meter
Turbidity
NA
NTU
Field Water Quality Meter
INORGANICS
Aluminum
0.005
mg/L
EPA 200.7 or 6010D
Antimony
0.001
mg/L
EPA 200.8 or 6020B
Arsenic
0.001
mg/L
EPA 200.8 or 6020A
Barium
0.005
mg/L
EPA 200.7 or 6010C
Beryllium
0.001
mg/L
EPA 200.8 or 6020A
Boron
0.05
mg/L
EPA 200.7 or 6010C
Cadmium
0.001
mg/L
EPA 200.8 or 6020A
Chromium
0.001
mg/L
EPA 200.8 or 6010C
Cobalt
0.001
mg/L
EPA 200.8 or 6020A
Copper
0.001
mg/L
EPA 200.8 or 6020B
Hexavalent Chromium
0.000025
mg/L
EPA 218.7
Iron
0.01
mg/L
EPA 200.7 or 6010C
Lead
0.001
mg/L
EPA 200.8 or 6020A
Manganese
0.005
mg/L
EPA 200.7 or 6010C
Mercury
0.000
mg/L
EPA 245.1 or 7470A
Molybdenum
0.001
mg/L
EPA 200.8 or 6020B
Nickel
0.001
mg/L
EPA 200.8 or 6020B
Selenium
0.001
mg/L
EPA 200.8 or 6020A
Strontium
0.005
mg/L
EPA 200.7 or 6010C
Thallium (low level)
0.0002
mg/L
EPA 200.8 or 6020A
Vanadium (low level)
0.0003
mg/L
EPA 200.8 or 6020A
Zinc
0.005
mg/L
EPA 200.7 or 6010C
RADIONUCLIDES
Radium 226
1
pCi/L
EPA 903.1 Modified
Radium 228
1
pCi/L
EPA 904.0/SW846 9320 Modified
Uranium (223, 234, 236, 238)
Varies by Isotope
µg/mL
SW846 3010A/6020B
Total Uranium
NA
µg/mL
Calculated
ANIONS/CATIONS
Alkalinity (as CaCO3)
5
mg/L
SM 2320B
Bicarbonate
5
mg/L
SM 2320
Calcium
0.01
mg/L
EPA 200.7
Carbonate
5
mg/L
SM 2320
Chloride
0.1
mg/L
EPA 300.0 or 9056A
Magnesium
0.005
mg/L
EPA 200.7
Potassium
0.1
mg/L
EPA 200.7
Sodium
0.05
mg/L
EPA 200.7
Sulfate
0.1
mg/L
EPA 300.0 or 9056A
Sulfide
0.1
mg/L
SM4500S2-D
Total Dissolved Solids
25
mg/L
SM 2540C
Total Organic Carbon
0.1
mg/L
SM 5310C/EPA9060A
Total Suspended Solids
2.5
m L
SM 2450D
Prepared by: RBI Checked by: SRW/TCP
Notes:
1. Select constituents will be analyzed for total and dissolved concentrations.
2. Analytical methods and reporting limits as presented were developed for CSA field implementation in 2015. Analytical methods and reporting limits are updated periodically and applied as
appropriate.
OC - Degrees Celsius
VS/cm - micro -Siemens per centimeter
mg/L - Milligrams per liter
mg - N/L - Milligrams nitrogen per liter
my - Millivolts
NA - Not analyzed
NTU - Nephelometric turbidity unit
pCi/L - picocuries per liter
RL - reporting limit
S.U. - Standard Unit
ug/mL - micrograms per milliliter
Page 1 of 1