HomeMy WebLinkAboutCCB0070_DukeBelewsCreek_GWAssessmentMonitoringPlan_DIN27003_20161107Belews Creek Steam Station 3195 Pine Hall Road Belews Creek, NC 27009
336-445-0610
336-669-2994
www.duke-energy.com Page 1 of 2
November 7, 2016
North Carolina Department of Environmental Quality Division of Waste Management
Solid Waste Section
1646 Mail Service Center
Raleigh, North Carolina 28778
Attn: Ms. Elizabeth Werner
Re: Proposed Groundwater Assessment and Monitoring Plan
Belews Creek Steam Station BCSS .1700 Structural Fill
Permit No.: CCB0070
Belews Creek Steam Station Stokes County
Belews Creek, North Carolina 27009
Dear Ms. Werner,
Attached you will find the Proposed Groundwater Assessment and Monitoring Plan for the
Belews Creek BCSS .1700 Structural Fill. This plan is being submitted to the Division for
approval.
Duke Energy is committed to excellent environmental stewardship and cooperation with the Division regarding the operation, maintenance, safety, and integrity of all of its facilities. We
look forward to continuing to work with you regarding environmental concerns.
If there are any questions regarding this request, please contact me at (336) 445-0610.
Respectfully submitted,
Melonie Martin
Environmental Services
Attachments: Proposed Groundwater Assessment and Monitoring Plan, Belews Creek Steam
Station BCSS .1700 Structural Fill, Permit No. CCB0070
www.duke-energy.com Page 2 of 2
cc (via e-mail): Ed Mussler, NCDEQ
Shawn McKee, NCDEQ
Evan Andrews, Duke Energy
Will Harrison, Duke Energy Kimberlee Witt, Duke Energy
Ed Sullivan, Duke Energy
Proposed
Groundwater
Assessment and
Monitoring Plan
Belews Creek Steam Station
BCSS .1700 Structural Fill
Stokes County, North Carolina
November 2016
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Proposed Groundwater Assessment and Monitoring Plan: BCSS .1700 Structural Fill
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Contents
Section 1 – Introduction ............................................................................................................. 3
Section 2 – Proposed Groundwater Assessment and Monitoring Plan ....................................... 6
2.1 Groundwater Assessment ............................................................................................ 6
2.2 Groundwater Monitoring............................................................................................... 6
2.3 Monitoring Well Installation .......................................................................................... 6
2.3.1 Well Installation Methods and Construction Requirements.................................... 7
2.3.2 Well Development ................................................................................................. 8
2.3.3 Well Survey .......................................................................................................... 9
2.3.4 Investigative Derived Waste .................................................................................10
2.3.5 Documentation .....................................................................................................10
2.4 Sample Collection and Analysis ..................................................................................10
2.4.1 Soil Sampling .......................................................................................................10
2.4.2 Groundwater Sampling ........................................................................................12
2.4.3 Surface Water Sampling ......................................................................................14
2.4.4 AOW Sampling ....................................................................................................14
Section 3 – Proposed Quality Assurance Plan ..........................................................................15
3.1 Field Documentation ...................................................................................................15
3.1.1 Field Logbooks ....................................................................................................15
3.1.2 Field Data Records ..............................................................................................15
3.2 Laboratory Documentation ..........................................................................................16
3.3 Quality Control ............................................................................................................17
3.3.1 Field Duplicates ...................................................................................................17
3.3.2 Field Blanks .........................................................................................................17
3.3.3 Data Validation ....................................................................................................17
Section 4 – Reporting................................................................................................................18
4.1 Assessment Report .....................................................................................................18
4.2 Monitoring Reports ......................................................................................................18
Section 5 – Proposed Schedule for Assessment and Monitoring ..............................................19
5.1 Assessment Schedule ................................................................................................19
5.2 Monitoring Schedule ...................................................................................................19
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FIGURES
Figure 1 – Site Location Map
Figure 2 – Site Layout Map
Figure 3 – Proposed Well and Sample Locations
Figure 4 – Monitoring Well Construction Details
TABLES
Table 1 – Proposed Monitoring Well Installation Plan
Table 2 – Soil and Ash Parameters and Constituent Analytical Methods
Table 3 – Groundwater Parameters and Constituent Analytical Methods
Table 4 – Proposed Schedule for Assessment of BCSS .1700 Structural Fill
Table 5 – Proposed Schedule for Monitoring of BCSS .1700 Structural Fill
APPENDICES
Appendix A – Low Flow Sampling Plan, Duke Energy Facilities, Ash Basin Groundwater
Assessment Program, North Carolina, June 10, 2015
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Section 1 – Introduction
Duke Energy Carolinas, LLC (Duke Energy) owns and operates the Belews Creek Steam
Station (BCSS), located on Belews Lake in Stokes County, North Carolina (Figure 1). BCSS
began operation in 1974 and operates two coal-fired units. Coal combustion residuals (CCR)
and other liquid discharges from BCSS’s coal combustion process have been disposed in the
ash basin since its construction. In 1983, BCSS converted to dry handling of fly ash with
disposal in on-site landfills; bottom ash is sluiced to the ash basin and fly ash is sluiced to the
ash basin on start-up and in emergency situations. Discharge from the ash basin is permitted by
the North Carolina Department of Environmental Quality (NCDEQ) Division of Water Resources
(DWR) under the National Pollutant Discharge Elimination System (NPDES) Permit
NC0024406.
Between February 2004 and July 2009, Duke Energy constructed a structural fill, using fly ash
generated from BCSS under the structural fill rules found in 15A NCAC 13B .1700. The BCSS
.1700 Structural Fill number CCB0070 (structural fill) is located south of the BCSS ash basin
and Pine Hall Road (Figure 2). The structural fill is currently used as an equipment/material
staging area and for overflow parking. The fill was constructed with the required thickness of soil
as a final cover in accordance with the .1700 rules. An engineered cover system, utilizing a
geomembrane, a geonet drainage system, and vegetated soil cover system, was constructed
over the structural fill in 2012.
In accordance with requirements in the Coal Ash Management Act of 2014 (CAMA), Duke
Energy conducted a comprehensive site assessment (CSA) at the BCSS ash basin in 2015. Per
the approved CSA work plan, ash used in the structural fill was not considered part of the
source area and was not evaluated during the CSA. As part of the CSA, surface water samples
were collected from an area of wetness (AOW) location (S-9) south of the ash basin and west of
the structural fill (Figure 2). Analytical results from S-9 exhibited exceedances of standards
specified in 15A NCAC 02L .0202 Groundwater Quality Standard (2L Standard) for boron,
cobalt, sulfate, and total dissolved solids (TDS) and an exceedance of the interim maximum
allowable concentration (IMAC) for cobalt. Installation and sampling of additional groundwater
monitoring wells in the area south of Pine Hall Road and adjacent to the structural fill was
recommended in the CSA Report.
To refine understanding of the source of the exceedances near S-9, monitoring wells GWA-23S
and GWA-23D were installed and sampled as part of the CAMA Round 5 sampling event (April
2016). Groundwater monitoring well pair GWA-23S/D was installed in April 2016, approximately
450 feet west of the structural fill and approximately 300 feet north of S-9 (Figure 2). Monitoring
well GWA-23S was installed with a 15-foot screened interval set to bracket the water table and
monitoring well GWA-23D was installed with a 5-foot screened interval in the transition zone,
below auger refusal. The location for well pair GWA-23S/D is approximately 1300 feet south of
the ash basin, approximately 860 feet south of the Chemical Treatment Pond, and
approximately 450 feet west of the structural fill.
The installed depths of the well screens are provided below.
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GWA-23S GWA-23D
Top of Casing (feet) 811.79 811.57
Groundwater Elevation (feet) 786.57 786.64
Screen Length (BGS - feet) 15 5
Top of Screen (BGS - feet) 24.40 56.61
Bottom of Screen (feet) 39.40 61.61
Top of Screen (elevation – feet) 787.39 754.96
Bottom of Screen (elevation – feet) 772.39 749.96
The ash basin full pond elevation is 750 feet. The surveyed water elevation in the Chemical
Treatment Pond in April 2014 was 772.0 feet. A pond depth survey performed by HDR in June
2014 measured an approximate maximum depth of 15 feet below the pond water surface. If the
water surface was at or near the April 2014 elevation of 772 feet, the corresponding elevation
would be 757 feet. The water elevation in this pond has been lowered and the surveyed
elevation in April 2016 was approximately 760.4 feet.
Exceedances of boron, cobalt, iron, manganese, sulfate, TDS, vanadium, and pH were found in
groundwater samples collected from GWA-23S/D after installation in April 2016. Concentrations
of the constituents in GWA-23S and GWA-23D are similar, indicating that the concentrations are
from the same source. The bottom of screen elevation in GWA-23S is 772.39 feet,
approximately 12 feet above the pond elevation in the Chemical Treatment Pond (760.4 feet)
and approximately 22.4 feet above the ash basin full pond elevation (750 feet).
This comparison of the elevation of the screen in GWA-23S and the ash basin full pond
elevation indicate that the source of the exceedances in GWA-23S is not the ash basin.
Although the bottom of screen elevation for GWA-23D (754.96 to 749.96 feet) is lower than the
Chemical Treatment Pond area historical elevation (772 feet), based on the similar nature of the
exceedances, it is likely that the same source is the cause of the exceedances in both GWA-
23S and GWA-23D.
The approximate elevation for AOW S-9 is 792 feet, which is greater than water elevations in
the ash pond and the Chemical Treatment Pond.
Additional evidence is noted in the comparison of the analytical results for boron, sulfate, and
TDS between monitoring wells GWA-9S/D and in GWA-9BR (well screened in bedrock), located
in the earthen dike for the Chemical Treatment Pond area, and the results for these constituents
in GWA-23S/D. As an example, boron is listed by the US EPA as a detection monitoring
constituent due to its association with impacts from CCR and its mobility in groundwater. Boron
concentrations in GWA-9S/D were less than the laboratory reporting limit of 50 µg/L during
sampling Rounds 1, 2, 5, and 6, and was reported in monitoring well GWA-9BR at 211 µg/L
during the sampling conducted in June 2016. Boron concentrations in GWA-23D were 3,540
µg/l and 3,080 µg/L in sampling performed in April 2016 and May 2016, respectively.
Groundwater flow maps for the shallow (saprolite) and deep (transition zone) flow layers based
on a gauging event performed on May 9, 2016 show a distinct groundwater drainage divide
along Pine Hall Road between the ash basin and GWA-23S/D and S-9, further indicating that
the exceedances are not related to the ash basin (Figures 3-1 and 3-2 in CSA Supplement 2
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dated August 11, 2016). The data indicates the presence of a drainage divide along Pine Hall
Road, and is consistent with the slope-aquifer system as clearly identified in the shallow and
deep flow layers.
The exceedances in GWA 23S/D are consistent with constituents associated with coal ash and
a potential source could be the nearby structural fill. As the structural fill was constructed under
the North Carolina Department of Environmental Quality (NCDEQ) Division of Waste
Management (DWM) structural fill rules found in 15A NCAC 13B .1700, Duke Energy notified
DWM of these exceedances and the assessment outlined below will be reported to the NCDEQ
DWM.
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Section 2 – Proposed Groundwater Assessment
2.1 Groundwater Assessment – Phase 1
Duke Energy proposes to perform a Phase 1 groundwater assessment to evaluate
exceedances of 2L Standards in the vicinity of wells GWA-23S/D and AOW sample location S-9
located adjacent to the structural fill. The purpose of the Phase 1 assessment is to investigate if
the structural fill is the source of groundwater exceedances at these locations.
Duke Energy will install a total of one shallow (SFMW-1S) and one deep (SFMW-1D) monitoring
well to evaluate groundwater flow direction and quality near the structural fill as shown on
Figure 3 (locations shown as proposed monitoring well locations – Phase 1). Duke Energy will
also collect samples from the four proposed surface water locations (SFSW-1 through SFSW-4)
and AOW S-9 shown on Figure 3.
Duke Energy proposes to conduct field sampling and laboratory analyses as described in the
following sections. After review of the results from these activities, Duke Energy will evaluate the
need for additional investigation, sampling, and analyses to support the assessment as well as
any modifications to the following Phase 2 groundwater assessment plan.
2.2 Groundwater Assessment – Phase 2
If the results of the Phase 1 groundwater assessment confirm the structural fill as the source of
groundwater exceedances in GWA-23S/D and AOW S-9, Duke Energy proposes to perform a
Phase 2 groundwater assessment.
Duke Energy will install a total of four shallow (SFMW-2S, SFMW-3S, SFMW-4S, and SFMW-
5S) and four deep (SFMW-2D, SFMW-3D, SFMW-4D, and SFMW-5D) monitoring wells to
monitor groundwater flow direction and quality near the structural fill as shown on Figure 3
(locations shown as proposed monitoring well locations – Phase 2). Duke Energy will also
collect samples from monitoring wells SFMW-1S and SFMW-1D, and AOW S-9 (Figure 3) as
part of the Phase 2 groundwater assessment.
2.3 Monitoring Well Installation
Soil samples will be collected for laboratory analyses during installation of the monitoring wells
to evaluate concentrations of constituents in the soil. Shallow well depths are estimated to be
approximately 50 feet bgs. The deep wells are estimated to be installed to be approximately 100
feet bgs. Well screens in the shallow wells will be installed to bracket the water table at the time
of installation. The well screens in the deep monitoring wells will be installed in partially
weathered rock (if present), below auger refusal. Proposed well locations and rationale for
installation are provided in the table below.
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Table 1 – Proposed Monitoring Well Installation Plan
PROPOSED WELL ID PROPOSED LOCATION PURPOSE FOR INSTALLATION
Assessment Phase 1
SFMW-1S West side of structural fill outside of
the waste boundary
Groundwater elevation and quality west
of the structural fill between the fill and the surface water drainage to the west;
collect soil samples
SFMW-1D West side of structural fill outside of the waste boundary Groundwater elevation and quality west of the structural fill between the fill and the surface water drainage to the west; collect soil samples
Assessment Phase 2
SFMW-2S North of the structural fill on
south side of Pine Hall Road
Groundwater elevation and quality upgradient of the structural fill; collect soil samples
SFMW-2D North of the structural fill on
south side of Pine Hall Road
Groundwater elevation and quality between the ash basin and GWA-23S/D; collect soil samples
SFMW-3S South/southwest side of structural fill outside of the waste boundary Groundwater elevation and quality south/southwest (downgradient) of the structural fill; collect soil samples
SFMW-3D South/southwest side of structural fill outside of the waste boundary Groundwater elevation and quality south/southwest (downgradient) of the structural fill; collect soil samples
SFMW-4S South/southeast side of structural fill outside of the waste boundary Groundwater elevation and quality south/southeast (downgradient) of the
structural fill; collect soil samples
SFMW-4D South/southeast side of structural fill outside of the waste boundary Groundwater elevation and quality south/southeast (downgradient) of the structural fill; collect soil samples
SFMW-5S East/southeast side of structural fill outside of the waste boundary Groundwater elevation and quality east/southeast (downgradient) of the
structural fill; collect soil samples
SFMW-5D East/southeast side of structural fill outside of the waste boundary Groundwater elevation and quality east/southeast (downgradient) of the
structural fill; collect soil samples
2.3.1 Well Installation Methods and Construction Requirements
Monitoring wells will be installed using drilling equipment appropriate for terrain at the drill site.
The drilling equipment will be clean and free from dirt, debris, and contaminants. Drilling will be
conducted in accordance with appropriate standard-of-care for the specified drilling technology.
Drill crews will be trained and experienced using the specific drilling techniques and equipment.
Monitoring wells will be constructed by a North Carolina-licensed driller in accordance with the
NCDEQ Division of Water Quality standards as specified in 15A NCAC 02C and under the
direction of a North Carolina-licensed geologist. Bentonite-based or synthetic-based drilling
fluids are not anticipated for use during installation of the monitoring wells. Only water from the
actual boring or an approved source will be used for drilling. All storage containers used for
transportation or storage of the water will be new or properly decontaminated prior to use at the
site.
Decontamination of downhole drilling equipment (such as augers, drill rods, cutting heads, etc.)
will be completed between well locations. After completion of a well, a water pressure cleaner
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will be used to decontaminate downhole tooling prior to reuse. If needed, brushes and water
from an approved source will be used to remove excess soil, mud, or other material from drilling
equipment. The decontamination water will be pumped into drums or placed directly onto the
ground surface.
2.3.1.1 MONITORING WELL CONSTRUCTION
Shallow (single-cased) monitoring wells (S wells) will be installed to bracket the water table
encountered in unconsolidated material (i.e., regolith or overburden) at the time of drilling and a
10-foot to 15-foot screen will be installed. Each well will be constructed with a 2-inch-inner-
diameter, Schedule 40 flush-joint-threaded PVC pipe fitted with a 20/40 (sand) pre-packed PVC
0.010-slot screen and a 2-inch-inner-diameter Schedule 40 PVC casing to the ground surface.
An additional filter pack (#2 sand) will be placed to at least 1 foot above the screen with a
minimum of 1-foot to 2-foot bentonite seal placed above the filter pack. The remaining annular
space will be grouted with a Portland cement-bentonite slurry to the ground surface using
positive displacement (i.e., tremie grout method). The monitoring well will be fitted with a
lockable well cap. For shallow monitoring well construction details see Figure 4.
Deep (double-cased) monitoring wells (D wells) will be installed in partially weathered rock
(PWR) to weathered rock for monitoring in the transition zone. The wells will be constructed
using a 6-inch-inner-diameter PVC outer casing seated approximately 1 foot into PWR, if
present. The annulus between the borehole and outer casing will be grouted using the tremie
grout method and will be allowed to cure for approximately 24 hours. The borings will be
advanced to approximately 15 feet below the bottom of the outer casing. The deep monitoring
wells will be constructed with a 2-inch-inner-diameter, schedule 40 flush-joint-threaded PVC
pipe fitted with a 5-foot long 20/40 (sand) pre-packed PVC 0.010-slot screen and a 2-inch-inner-
diameter schedule 40 PVC casing to the ground surface. An additional filter pack (#2 sand) will
be placed to at least 1 foot above the screen with a minimum of 1 to 2 foot bentonite seal placed
above the filter pack. The remaining annular space will grouted with a Portland cement-
bentonite slurry to the ground surface using positive displacement (i.e., tremie grout method).
The monitoring wells will be fitted with a lockable well cap. For typical deep monitoring well
construction details see Figure 4.
2.3.1.2 MONITORING WELL SURFACE COMPLETION
Each well will be finished at the ground surface with a 2-foot by 2-foot concrete well pad and a
4-inch or 8-inch steel or aluminum above-grade lockable protective cover. All wells will be
locked with a keyed padlock. Bollards will be installed as needed to protect monitoring wells
from potential damage from vehicles and/or heavy equipment.
2.3.2 Well Development
Each monitoring well will be developed prior to commencing groundwater sampling activities.
Monitoring well development will be performed in general accordance with the following
procedures. Deviations from these procedures will be verified by the Project Manager prior to
implementation.
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1. Monitoring well development will not be performed until 24 hours have passed after well
completion to allow for grout/cement curing.
2. The duration of development, initial water level, well depth, development method (i.e.,
bailing, surging, pumping), and field parameter measurements (listed in item #4 below)
will be documented on a Well Development Record.
3. Monitoring wells will be developed using pumping and surging techniques. The wells will
be pumped using a centrifuge or submersible pump (Wahl, Monsoon, or equivalent) to
remove suspended particles and induce flow into the well to prevent clogging of the filter
pack. Wells that cannot be developed utilizing a pump due to insufficient volume may
use a bailer to evacuate the well. If it is determined by the developers that there is a
significant sediment slug at the bottom of the well, it can be removed using a foot valve
pump or bailer in lieu of the centrifugal or submersible pump. Once removed, well
development will continue with the centrifugal or submersible pump.
4. Field parameter measurements of dissolved oxygen (DO), oxidation reduction potential
(ORP), pH, temperature, specific conductivity, and turbidity will be recorded for every
5 gallons of discharge. A 5-gallon bucket can be used for purge water volume
measurements. For wells with slow recovery, field parameters will be checked every
2 gallons of discharge.
5. Pumping should begin at the top of the well screen with low pumping rates and
incrementally work down the screen. The well will be surged periodically by raising and
lowering the pump within the water column three to five times in succession, being
careful not to touch the bottom of the well with the pump. If turbidity values remain over
10 Nephelometric Turbidity Units (NTU), the well will be allowed to equilibrate (90
percent or greater of the original static water level) and the process repeated.
6. Development will continue for a minimum of 1 hour or three well volumes (whichever
duration is longer) until turbidity is less than 10 NTU and until monitoring parameters of
pH, temperature, conductivity, and turbidity are generally stabilized.
7. If development has continued longer than 3 hours and turbidity values remain in excess
of 10 NTU, the well should be allowed to equilibrate for 24 hours or 90 percent of the
original static water level, and the development process will be repeated until turbidity is
less than 10 NTU. If turbidity readings do not decrease after multiple developments, the
development team will consult the Project Manager to discuss other options to resolve
current conditions, including reinstallation.
8. Following development, sounding of the bottom of the well with a water level meter
should indicate a “hard” (sediment-free) bottom.
2.3.3 Well Survey
Newly installed monitoring wells will be surveyed for horizontal and vertical locations by a North
Carolina-licensed surveyor. The measuring points will include: 1) the top of the 2-inch PVC well
casing, and 2) ground surface at each monitoring well in the groundwater monitoring network.
The location and position accuracy will be approximately 1.0-foot for horizontal control, 0.1-foot
for ground surface elevation, and 0.01-foot for well top-of-casing (TOC) elevation.
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The locations and elevations of the surface water sample locations will be surveyed when the
well location surveys are performed.
2.3.4 Investigative Derived Waste
IDW such as nitrile gloves, paper towels, and other miscellaneous waste generated during well
installation will be bagged, placed in a commercial dumpster, and managed as municipal solid
waste.
Soil cuttings generated during drilling will be spread near monitoring well locations so that it is
not a safety concern and seed/straw will be applied to aid in restoration. Water generated during
decontamination of equipment, monitoring well development, and sampling will be discharged to
the ground surface in the vicinity of the decontamination pad or monitoring well location.
Alternatively, cuttings and water may be stored in drums and properly disposed either on site or
off site.
2.3.5 Documentation
Documentation of field activities will be completed using a combination of log books and field
forms. Log books are completed to provide a general record of activities and events that occur
during daily tasks (e.g., detailed descriptions of subsurface media encountered and
observations made during boring installation). During well installation and development of the
monitoring wells, the following field forms will be used for documentation:
• Boring logs will be utilized to document lithology and details of boring advancement.
• Monitoring well construction logs will be utilized to record final well construction details.
• Monitoring well development record forms will be utilized to document well development
activities for each newly installed monitoring well (see Section 2.1.2).
Duke Energy will submit a well construction record (NCDEQ Form GW-1) to NCDEQ for newly
installed groundwater monitoring wells.
2.4 Sample Collection and Analysis
For this groundwater assessment plan, sampling will consist of collection and analysis of soil,
groundwater, surface water, and AOW samples. For the groundwater monitoring plan, sampling
will consist of soil, groundwater, and AOW samples. Sample analyses will be performed by a
North Carolina-certified analytical laboratory.
2.4.1 Soil Sampling
2.4.1.1 SAMPLING PROCEDURES
Split-spoon (SPT) and disturbed sampling is proposed during installation of wells using a split-
spoon sampler driven 18 inches into the ground with an automatic 140-pound hammer. SPT will
be conducted at 5-foot intervals (3.5 feet between samples) for the soil samples (e.g., 3.5 feet to
5 feet, 8.5 feet to 10 feet, 13.5 feet to 15 feet, 18.5 feet to 20 feet). After collection, the sampler
will be opened and recovered material will be described in the field in accordance with the
Unified Soil Classification System (USCS).
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To evaluate concentrations of constituents in the soil, samples will be collected approximately
halfway from the ground surface to the water table and approximately 5 feet above the water
table from each of the shallow monitoring well borings for laboratory analysis.
2.4.1.2 CONSTITUENT ANALYSES
Duke Energy proposes to analyze soil samples for parameters and constituents consistent with
those analyzed during the CAMA CSA at BCSS in 2015 (Table 2). The laboratory analytical
methods employed will be consistent with the methods used during the CSA. The soil analytical
results will be compared to the North Carolina Preliminary Soil Remediation Goals (PSRGs) for
Industrial Health and Protection of Groundwater Standards.
Table 2 – Soil Parameters and Constituent Analytical Methods
INORGANIC COMPOUNDS UNITS METHOD
Aluminum mg/kg EPA 6010
Antimony mg/kg EPA 6020
Arsenic mg/kg EPA 6020
Barium mg/kg EPA 6010
Beryllium mg/kg EPA 6010
Boron mg/kg EPA 6010
Cadmium mg/kg EPA 6020
Chloride mg/kg EPA 9056
Chromium (Total) mg/kg EPA 6010
Hexavalent Chromium (CrVI) (low level) mg/kg EPA 3060
Cobalt mg/kg EPA 6020
Copper mg/kg EPA 6010
Iron mg/kg EPA 6010
Lead mg/kg EPA 6020
Manganese mg/kg EPA 6010
Mercury mg/kg EPA 7471
Molybdenum mg/kg EPA 6020
Nickel mg/kg EPA 6010
pH SU EPA 9045
Selenium mg/kg EPA 6020
Strontium mg/kg EPA 6020
Thallium (low level) mg/kg EPA 6020
Vanadium mg/kg EPA 6020
Zinc mg/kg EPA 6010
Calcium mg/kg EPA 6010
Magnesium mg/kg EPA 6010
Nitrate mg/kg EPA 9056
Nitrogen mg/kg EPA 353.2
Potassium mg/kg EPA 6010
Sodium mg/kg EPA 6020
Sulfate mg/kg EPA 9056
Total Organic Carbon mg/kg EPA 9060 Modified
Notes:
1. mg/kg – milligrams per kilogram
2. SU – standard units
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2.4.2 Groundwater Sampling
2.4.2.1 GROUNDWATER LEVEL MEASUREMENTS
Prior to groundwater purging and sampling activities, a depth-to-water (DTW) measurement will
be recorded in each well during a comprehensive gauging event (not to exceed a 24- to 48-hour
period). Groundwater levels will be measured using an electronic water level indicator that will
be decontaminated between each well prior to measurement activities. The DTW
measurements will be referenced to the well TOC mark established by a site survey and will
provide data used to generate a potentiometric surface map for the area. In addition to the
newly installed monitoring wells as part of the groundwater assessment, DTW measurements
will also be recorded in monitoring wells AB-9S, AB-9D, AB-9BR, GWA-7S, GWA-7D, GWA-8S,
GWA-8D, MW-3, MW-7, GWA-23S, GWA-23D, GWA-12S, GWA-12D, and GWA-12BR.
Groundwater level measurements will only be collected from the proposed assessment and
monitoring wells as part of the groundwater monitoring plan.
2.4.2.2 GROUNDWATER PURGING AND SAMPLING PROCEDURES
Subsequent to well installation and development, groundwater samples will be collected from
each monitoring well using low flow sampling techniques as outlined in the Low Flow Sampling
Plan, Duke Energy Facilities, Ash Basin Groundwater Assessment Program, North Carolina,
June 10, 2015 (Low Flow Sampling Plan) (Appendix A) to collect samples that are
representative of ambient groundwater conditions in the aquifer..
In addition to the wells proposed for installation during the assessment, groundwater samples
will also be collected from monitoring wells AB-9S, AB-9D, AB-9BR, GWA-7S, GWA-7D, GWA-
8S, GWA-8D, MW-3, MW-7, GWA-23S, GWA-23D, GWA-12S, GWA-12D, and GWA-12BR.
Groundwater samples will only be collected from the proposed assessment and monitoring
wells as part of the groundwater monitoring plan.
Groundwater purging and sampling will be conducted using new or dedicated tubing for each
well. Bladder, peristaltic, and/or submersible pumps will be utilized to achieve minimum
drawdown.
Purge water will be pumped from the monitoring well into a flow-through cell, which will allow for
monitoring of field parameters using an YSI Professional Plus multi-parameter water quality
meter or similar instrument. Turbidity will be measured using a separate turbidity meter. Field
parameters to be measured during purging and sampling and will include pH, temperature,
specific conductivity, DO, ORP, and turbidity, as listed below in Table 3. Filtered and unfiltered
samples using a 0.45-micron filter will be collected.
2.4.2.3 CONSTITUENT ANALYSES
A laboratory certified in North Carolina will analyze groundwater samples for the constituents
and analytical methods listed in Table 3. The constituents will be analyzed for total recoverable
and dissolved fraction concentrations. The record of groundwater analyses will include the
methods used (by number), the extraction date (if applicable), and the date of analysis. Data
obtained from samples that are not analyzed within the recommended holding times will be
considered suspect and flagged accordingly. Any deviation from approved methods will be
adequately tested to ensure that the quality of the results meets the performance specifications
(e.g., detection limit, sensitivity, precision, accuracy) of the reference method.
Duke Energy Carolinas, LLC | Belews Creek Steam Station
Proposed Groundwater Assessment and Monitoring Plan: BCSS .1700 Structural Fill
13
Table 3 – Groundwater Parameters and Constituent Analytical Methods
PARAMETER RL UNITS METHOD
FIELD PARAMETERS
pH NA SU Field Water Quality Meter
Specific Conductance NA µS/cm Field Water Quality Meter
Temperature NA ºC Field Water Quality Meter
Dissolved Oxygen NA mg/L Field Water Quality Meter
Oxidation Reduction Potential NA mV Field Water Quality Meter
Turbidity NA NTU Field Water Quality Meter
Ferrous Iron NA mg/L Field Test Kit
INORGANICS
Aluminum 5 µg/L EPA 200.7 or 200.8
Antimony 1 µg/L EPA 200.7 or 200.8
Arsenic 1 µg/L EPA 200.7 or 200.8
Barium 5 µg/L EPA 200.7 or 200.8
Beryllium 1 µg/L EPA 200.7 or 200.8
Boron 50 µg/L EPA 200.7 or 200.8
Cadmium 1 µg/L EPA 200.7 or 200.8
Chromium 1 µg/L EPA 200.7 or 200.8
Hexavalent Chromium 0.07 µg/L EPA 200.7 or 200.8
Cobalt 1 µg/L EPA 200.7 or 200.8
Copper 0.005 mg/L EPA 200.7 or 200.8
Iron 10 µg/L EPA 200.7 or 200.8
Lead 1 µg/L EPA 200.7 or 200.8
Manganese 5 µg/L EPA 200.7 or 200.8
Mercury 0.2 µg/L EPA 245.1
Molybdenum 0.5 µg/L EPA 200.7 or 200.8
Nickel 1 µg/L EPA 200.7 or 200.8
Selenium 1 µg/L EPA 200.7 or 200.8
Strontium 5 µg/L EPA 200.7 or 200.8
Thallium (low level) 0.2 µg/L EPA 200.7 or 200.8
Vanadium (low level) 0.3 µg/L EPA 200.7 or 200.8
Zinc 5 µg/L EPA 200.7 or 200.8
ANIONS/CATIONS
Alkalinity (as CaCO3) 20 mg/L SM 2320B
Bicarbonate 20 mg/L SM 2320B
Calcium 0.01 mg/L EPA 200.7 or 200.8
Carbonate 20 mg/L SM 2320B
Chloride 0.1 mg/L EPA 300.0
Magnesium 0.001 mg/L EPA 200.7 or 200.8
Methane 0.1 mg/L RSK 175
Nitrate as Nitrogen 0.02 mg-N/L EPA 353.2
Potassium 0.1 mg/L EPA 200.7 or 200.8
Sodium 0.05 mg/L EPA 200.7 or 200.8
Sulfate 0.1 mg/L EPA 300.0
Sulfide (as H2S) 0.05 mg/L SM4500S2-D
Total Dissolved Solids 25 mg/L SM 2540C
Total Organic Carbon 0.1 mg/L SM 5310B
Total Suspended Solids 2 mg/L SM 2540D
Notes:
1. Units: SU – standard units; µS/cm – microsiemens per centimeter; ºC – degrees Celsius; mg/L – milligrams per liter; mV –
millivolts; NTU – Nephelometric Turbidity Unit; µg/L – microgram per liter; mg-N/L – milligrams nitrogen per liter.
2. RL is the laboratory analytical method reporting limit.
3. NA indicates not applicable.
4. Sulfide (as H2S) will be analyzed for groundwater samples only.
5. All EPA methods and RLs are at or below the respective criteria (2L Standards, IMACs, DHHS HSL) for constituents with
criteria.
Duke Energy Carolinas, LLC | Belews Creek Steam Station
Proposed Groundwater Assessment and Monitoring Plan: BCSS .1700 Structural Fill
14
Sample preservation and handling will be conducted in accordance with the procedures
specified in Sections 3.5.1 and 3.5.2 of the Low Flow Sampling Plan (Appendix A).
Decontamination will be conducted in accordance with the procedures specified in Appendix A
(Decontamination of Equipment Standard Operating Procedure) of the Low Flow Sampling Plan
(Appendix A).
2.4.3 Surface Water Sampling
As part of the groundwater assessment Duke Energy will collect four surface water samples
(SFSW-1 through SFSW-4) from the two surface water drainage features located upstream of
AOW S-9. Samples will be obtained using a telescoping cup sampler or collected directly into
laboratory prepared sampling containers and will be analyzed for the same list of parameters
and constituents, using the same laboratory analytical methods, as the groundwater samples
(listed in Table 3). Filtered and unfiltered samples using a 0.45-micron filter will be collected.
These surface water locations will not be sampled as part of the structural fill monitoring plan.
2.4.4 AOW Sampling
AOW S-9 will be sampled during the assessment and analyzed for the same list of parameters
and constituents using the same laboratory methods as the groundwater samples (listed in
Table 3). Filtered and unfiltered samples using a 0.45-micron filter will be collected. AOW S-9
will also be sampled as part of the structural fill monitoring plan.
Duke Energy Carolinas, LLC | Belews Creek Steam Station
Proposed Groundwater Assessment and Monitoring Plan: BCSS .1700 Structural Fill
15
Section 3 – Proposed Quality Assurance Plan
The Quality Assurance Plan (QAP) has been prepared to specify quality assurance/quality
control (QA/QC) procedures for collection, analysis, and evaluation of data that will be legally
and scientifically defensible. The QAP provides general information and references standard
operating procedures applicable to the analytical sampling program. This information includes
definitions and generic goals for data quality and required types and quantities of QA/QC
samples. The procedures address field documentation; sample handling, custody and shipping;
instrument calibration and maintenance; auditing; data reduction, validation, and reporting;
corrective action requirements; and QC reporting specific to the analysis performed by the
NCDEQ-approved laboratory.
3.1 Field Documentation
Documentation of field activities will be completed using a combination of field log books, field
data records (FDRs), sample tracking systems, and sample custody records. The log books and
FDRs will be completed to provide a general record of activities and events that occur during
each field task. FDRs and/or sample custody records are used to provide a complete record of
data collected during sampling.
3.1.1 Field Logbooks
Field logbooks will provide a daily hand-written account of field activities. The logbooks utilized
will be bound hardcover books. Entries will be made in indelible ink and corrections will be made
with a single line with the author initials and date. Each page of the logbook will include the job
number, date, and initials of the person completing the log. Partially completed pages will have
a line drawn through the unused portion at the end of each day with the author’s initials. The
following general information will be entered into the field logbooks:
• The date and time of each entry. The daily log will begin with a safety brief.
• A summary of important tasks or subtasks completed during the day.
• A description of field test completed in association with the daily task.
• A description of samples collected including documentation of any quality control
samples that were prepared (i.e., rinse blanks, duplicates, matrix spike, split samples,
etc.).
• Documentation of equipment maintenance and calibration activities.
• Documentation of equipment decontamination activities.
• Descriptions of deviations from the work plan.
3.1.2 Field Data Records
FDRs will contain sample collection and/or exploration details. A FDR will be completed each
time a field sample is collected. The purpose of the FDR is to document exploration and sample
collection methods, materials, dates and times, and sample locations and identifiers. Field
measurements and observations associated with a given exploration or sample collection task
will be recorded on the FDRs. FDRs will be maintained throughout the field program in files that
become a permanent record of field program activities. A listing of FDRs is presented below.
Duke Energy Carolinas, LLC | Belews Creek Steam Station
Proposed Groundwater Assessment and Monitoring Plan: BCSS .1700 Structural Fill
16
Each FDR listed will not be required for each step-specific activity that may or may not be
required over the entire project. Examples of FDRs include:
• Groundwater Potentiometric Level Measurement Log
• Well Sampling/Low Flow Sampling Log
• Well Installation and Boring Log
• Well Development Record
• Field Instrument Calibration Record
3.2 Laboratory Documentation
A program of sample tracking and custody will be followed during sample handling activities in
both field and laboratory operations. This program will be designed to ensure that each sample
is accounted for at all times. The appropriate sampling and laboratory personnel will complete
sample FDRs, chain-of-custody records, and laboratory receipt sheets. Additional information
documented in the chain-of-custody may be required such as shipping information for samples
sent by courier.
Each sample container will typically have a label affixed to it and will be prepared prior to
sampling to include the following information:
• Sample location using a unique sample identification (i.e., SFMW-1S)
• Date and time collected
• Sampler identification
• Analyses requested and applicable preservative
The chain-of-custody (COC) will be initiated at the time of sample collection to provide record of
the following:
• Sample location (ID), number of containers corresponding to each sample, and sample
handling procedures
• Applicable preservatives and analyses requested
• Date and time of sample collection
• Name of sampler(s) and person(s) shipping the samples (if applicable)
• Date and time samples were relinquished (e.g., picked up by lab courier)
• If samples are shipped, a custody seal will be affixed to outside of each sample cooler
• Name(s) of those responsible for receiving the samples at the laboratory
COCs will be prepared by the field sampler who will be responsible for the care and integrity of
samples until they are properly relinquished to the laboratory or shipped.
Sample containers will be packed in coolers to reduce movement during transport to the
laboratory. Styrofoam and bubble-pack may be used as packing materials, if needed. Ice will be
placed in the coolers. Paperwork (COC forms) will be placed in a separate, re-sealable, water-
tight, plastic bag within the cooler. A temperature blank provided by the laboratory will be placed
in each cooler, if required by the laboratory to verify the cooler was maintained at 4º Celcius (C)
[+/- 2ºC] during sample transport. Custody seals will be placed across the lid and cooler-body
interface prior to shipment to or pick up by the laboratory.
Duke Energy Carolinas, LLC | Belews Creek Steam Station
Proposed Groundwater Assessment and Monitoring Plan: BCSS .1700 Structural Fill
17
3.3 Quality Control
Field QC samples are not included specifically as laboratory QC samples but are analyzed
when submitted to provide quality control data relative to the field sampling and sample
management procedures. Data for field QC samples will be reported with associated samples.
Field QA/QC samples will be analyzed for the same constituents as soil or groundwater
samples (Tables 2 and 3) unless otherwise noted.
3.3.1 Field Duplicates
Field duplicates are two samples of the same matrix which are collected, to the extent possible,
from the same location at the same time using the same techniques. Field duplicates provide
information on the precision of the sampling and analysis process. Field duplicates will be
collected at a frequency of one duplicate for every 20 samples collected (per media). If the total
number of samples collected per media is less than 20, one field duplicate will be collected per
day, per media of sampling.
3.3.2 Field Blanks
Field blanks are prepared in the field to evaluate the potential for contamination of a sample by
site contaminants from a source not associated with the sample collected (examples include
dust or organic vapors). Analyte-free water provided by the laboratory will be brought to the field
by the sampling crew and transferred to the proper sample container for shipment along with the
other samples collected. One field blank sample will be collected per sampling day.
3.3.3 Data Validation
Data validation describes an analyte-specific and sample-specific process of evaluating that a
data set meets method, procedure, and contract requirements. Data review and validation will
be performed in accordance with the United States Environmental Protection Agency (USEPA)
Contract Laboratory Program (CLP) National Functional Guidelines for Superfund Organic
Methods Data Review (USEPA 2014a) and the USEPA CLP National Functional Guidelines for
Inorganic Data Review (USEPA 2014b). Analytical data will be reviewed and validated at a rate
of 100 percent. Analytical results and qualifiers will be assessed using professional judgment to
determine the final quality and usability of the data. Examples of data validation qualifiers
include:
U The analyte was analyzed for, but was not detected to the method detection limit, and
was not quantifiable to the reporting limit.
J The result is an estimated quantity. The associated numerical value is the approximate
concentration of the analyte in the sample.
J+ The result is an estimated quantity, but the result may be biased high
J- The result is an estimated quantity, but the result may be biased low.
UJ The analyte was not detected; however, the result is estimated due to discrepancies in
meeting certain analyte-specific quality control criteria.
R The data are unusable. The sample results are rejected due to serious deficiencies in
meeting QC criteria. The analyte may or may not be present in the sample.
Duke Energy Carolinas, LLC | Belews Creek Steam Station
Proposed Groundwater Assessment and Monitoring Plan: BCSS .1700 Structural Fill
18
Section 4 – Reporting
4.1 Phase 1 Assessment Report
The results of the work performed under the Phase 1 groundwater assessment plan will be
reported to the NCDEQ DWM as a Phase 1 groundwater assessment report (Assessment
Report – Phase 1). The Assessment Report – Phase 1 will present the findings of the soil
sampling and analyses, well installation, and groundwater, surface water, and AOW sampling
activities. Supporting figures (e.g., chembox, potentiometric surface, and isoconcentration
figures) and tables (e.g., well construction, groundwater elevation, and analytical tables) will be
included in the Assessment Report – Phase 1 to summarize and interpret the results of the work
associated with the structural fill.
As discussed in Section 2, Duke Energy proposes to perform the activities described and to
collect and analyze samples of soil, groundwater, surface water, and AOWs as needed. After
the initial review of the results from these activities, Duke Energy will evaluate if additional
investigation, sampling, and analyses are needed to confirm the structural fill as the source of
exceedances. These additional assessment activities could include completion of additional
borings to collect soil samples or installation of additional groundwater monitoring wells. Duke
Energy proposes to communicate the results of the initial review with the NCDEQ DWM prior to
conducting additional assessment activities.
4.2 Phase 2 Assessment Report
The results of the work performed under the Phase 2 groundwater assessment plan will be
reported to the NCDEQ DWM as a Phase 2 groundwater assessment report (Assessment
Report – Phase 2). The Assessment Report – Phase 2 will present the findings of the soil
sampling and analyses, well installation, and groundwater, and AOW sampling activities.
Supporting figures (e.g., chembox, potentiometric surface, and isoconcentration figures) and
tables (e.g., well construction, groundwater elevation, and analytical tables) will be included in
the Assessment Report – Phase 2 to summarize and interpret the results of the work associated
with the structural fill.
As discussed in Section 2, Duke Energy proposes to perform the activities described and to
collect and analyze samples of soil, groundwater, surface water, and AOWs as needed. After
the initial review of the results from these Phase 2 activities, Duke Energy will evaluate if
additional investigation, sampling, and analyses are needed. These additional assessment
activities could include completion of additional borings to collect soil samples or installation of
additional groundwater monitoring wells.
Duke Energy Carolinas, LLC | Belews Creek Steam Station
Proposed Groundwater Assessment and Monitoring Plan: BCSS .1700 Structural Fill
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Section 5 – Proposed Schedule for Assessment
5.1 Assessment Schedule – Phase 1
The schedule for completion of the Phase 1 groundwater assessment scope of work is
contingent on NCDEQ DWM approval of the proposed groundwater assessment plan. HDR
proposes the following schedule for the Phase 1 assessment tasks (Table 4) relative to receipt
of authorization and Notice to Proceed (NTP) by Duke Energy procurement and subsequent to
NCDEQ approval of the proposed groundwater assessment plan.
Table 4 – Proposed Schedule for Phase 1 Assessment of BCSS .1700 Structural Fill
TASK PROPOSED TIMELINE – AFTER APPROVAL BY NCDEQ AND RECEIPT OF AUTHORIZATION AND NOTICE TO PROCEED
Erosion and Sediment Control Plan 2 weeks
Erosion and Sediment Control Plan
Approval 4 weeks after submittal of erosion and sediment control plan
Monitoring Well Installation 4 weeks after approval of erosion and sediment control plan
Sample Collection and Analysis 2 weeks after completion of well installation
Data Validation 2 weeks after receipt of laboratory analytical reports
Submittal of Phase 1 Groundwater Assessment Report 8 weeks after completion of data validation
5.2 Assessment Schedule – Phase 2
The schedule for completion of the Phase 2 groundwater monitoring scope of work is contingent
on NCDEQ DWM approval of the proposed groundwater monitoring plan and the results of the
Phase 1 groundwater assessment report confirming the structural fill as the source of
exceedances. HDR proposes the following schedule for the Phase 2 assessment tasks (Table
5) relative to receipt of authorization and Notice to Proceed (NTP) by Duke Energy procurement
and subsequent to NCDEQ approval of the proposed groundwater monitoring plan.
Table 5 – Proposed Schedule for Phase 2 Assessment of BCSS .1700 Structural Fill
TASK PROPOSED TIMELINE – AFTER APPROVAL OF PHASE 1
ASSESSMENT REPORT BY NCDEQ AND RECEIPT OF AUTHORIZATION AND NOTICE TO PROCEED
Erosion and Sediment Control Plan 2 weeks
Erosion and Sediment Control Plan
Approval 4 weeks after submittal of erosion and sediment control plan
Monitoring Well Installation 6 weeks after approval of erosion and sediment control plan
Sample Collection and Analysis 2 weeks after completion of well installation
Data Validation 2 weeks after receipt of laboratory analytical reports
Submittal of Phase 2 Groundwater Assessment Report 8 weeks after completion of data validation
Duke Energy Carolinas, LLC | Belews Creek Steam Station
Groundwater Assessment Plan: BCSS .1700 Structural Fill
Figures
ASH LANDFILLPERMIT NO.8503
FGDLANDFILLPERMIT NO.8505
CRAIG ROADLANDFILLPERMIT NO.8504
1000 2000
0 1000
DATE
FIGURE
SITE LOCATION MAPBCSS .1700 STRUCTURAL FILL ASSESSMENTDUKE ENERGY CAROLINAS, LLC
STOKES COUNTY, NORTH CAROLINA
NOVEMBER 2016
1
SITE LOCATION MAPBCSS .1700 STRUCTURAL FILL ASSESSMENT
BELEWS CREEK STEAM STATION
STOKES COUNTY, NORTH CAROLINA
OCTOBER 2016
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Duke Energy Carolinas, LLC | Belews Creek Steam Station
Groundwater Assessment Plan: BCSS .1700 Structural Fill
Appendix A
Low Flow Sampling Plan, Duke Energy Facilities, Ash Basin Groundwater Assessment Program, North Carolina, June 10, 2015
Low Flow Sampling Plan
Duke Energy
Facilities
Ash Basin Groundwater Assessment Program
North Carolina
June 10, 2015
Duke Energy | Low Flow Groundwater Sampling PlanTable of Contents
TABLE OF CONTENTS
Low Flow Sampling Plan ....................................................................................................... 1
1.0 PURPOSE ............................................................................................................................... 1
2.0 GENERAL CONSIDERATIONS ............................................................................................. 1
3.0 PROCEDURES ....................................................................................................................... 2
3.1 Pre-Job Preparation ............................................................................................................. 2
3.2 Water-Level Measurements ................................................................................................. 3
3.3 Well Purging ........................................................................................................................ 4
3.3.1 Low-Flow Well Purging ............................................................................................ 4
3.3.2 Volume-Averaging Well Purging .............................................................................. 8
3.4 Sampling ....................................................................................................................... 10
3.4.1 Low-Flow Sampling ............................................................................................... 10
3.4.2 Sampling after Volume-Averaging Purge ............................................................... 11
3.5 Sample Handling, Packing, and Shipping ..................................................................... 11
3.5.1 Handling ................................................................................................................ 11
3.5.2 Sample Labels ....................................................................................................... 11
3.5.3 Chain-of-Custody Record ...................................................................................... 12
3.6 Field Quality Control Samples ....................................................................................... 12
3.7 Field Logbook Documentation....................................................................................... 13
3.8 Decontamination and Waste Management ................................................................... 14
4.0 REFERENCES ..................................................................................................................... 14
APPENDIX ADecontamination of Equipment SOP ................................................................... 15
1.0 Purpose & Application ...................................................................................................... 16
2.0 Equipment & Materials .......................................................................................................... 16
3.0 Procedure ............................................................................................................................. 16
3.1 Decontamination of Non-Disposable Sampling Equipment .......................................... 16
3.2 Decontamination of Field Instrumentation .................................................................... 16
3.3 Decontamination of Groundwater Sampling Equipment ............................................... 17
3.4 Materials from Decontamination Activities .................................................................... 17
APPENDIX BSampling Equipment Check List – Table 1.......................................................... 18
APPENDIX CField Logbook/Data Sheets ................................................................................. 20
Duke Energy | Low Flow Groundwater Sampling Plar1.0 PURPOSE
1
1.0 PURPOSE
The purpose of this low flow sampling plan is to establish a standard operating
procedure (SOP) to describe collection procedures for groundwater samples from
monitoring wells using low-flow purging and sampling techniques or by the volume-
averaged purging and sampling method at Duke Energy Ash Basin Groundwater
Assessment Program facilities.
2.0 GENERAL CONSIDERATIONS
Potential hazards associated with the planned tasks shall be thoroughly evaluated prior
to conducting field activities. The Ready-To-Work Plan developed for each facility
provides, among other items, a description of potential hazards and associated safety
and control measures.
Sampling personnel must wear powder-free nitrile gloves or equivalent while
performing the procedures described in this SOP. Specifically, gloves must be worn
while preparing sample bottles, preparing and decontaminating sampling equipment,
collecting samples, and packing samples. At a minimum, gloves must be changed
prior to the collection of each sample, or as necessary to prevent the possibility of
cross-contamination with the sample, the sample bottles, or the sampling equipment.
Field sampling equipment shall be decontaminated in accordance with the
Decontamination of Equipment SOP (Appendix A) prior to use. Although sampling
should typically be conducted from least to most impacted location, field logistics may
necessitate other sample collection priorities. When sampling does not proceed from
least to most impacted location, precautions must be taken to ensure that appropriate
levels of decontamination are achieved.
An example of equipment needed to properly conduct low-flow purging and sampling or
volume- averaged groundwater purging and sampling is listed on the example checklist
in Table 1 (Appendix B).
If a portable generator is used to power the purge pump, it shall be attempted to be
located downwind of the well being sampling to avoid cross-contamination of the sample
with exhaust from the generator motor.
Duke Energy | Low Flow Groundwater Sampling Plan3.0 PROCEDURES
2
3.0 PROCEDURES
The following sections describe the general operating procedures and methods
associated with groundwater sampling. Any variation in these procedures must be
approved by the Project Manager (PM) and Quality Assurance/Quality Control (QA/QC)
Lead and must be fully documented. Field work cannot progress until deviations are
approved or resolved.
3.1 Pre-Job Preparation
The information listed below may be reviewed prior to sampling activities, if available,
and can be beneficial on-site for reference in the field as necessary:
• A list of the monitoring wells to be sampled;
• Information describing well location, using site-specific or topographic maps or
Global Positioning System (GPS) coordinates and descriptions tied directly to
prominent field markers;
• A list of the analytical requirements for each sampling location;
• Boring logs and well construction details, if available;
• Survey data that identify the documented point of reference (V-notch or other
mark on well casing) for the collection of depth-to-groundwater and total well
depth measurements;
• Previous depth-to-groundwater measurements;
• Previous pump placement depths (dedicated pumps as well as portable pumps)
for each sampling location, if available;
• Previous pump settings and pumping and drawdown rates, if available; and
• Previous analytical results for each monitoring well, if known.
The information above is useful when determining the sampling order, pump intake
depth, and purge and recharge rates, and can facilitate troubleshooting.
The following activities should be completed prior to mobilizing to the site:
• Obtain equipment necessary for completing the sampling activities (see the
example checklist in Table 1).
• Ensure appropriate laboratory-provided bottles are available for both the required analyses and for QC samples and that there has been thorough coordination with
the analytical laboratory.
Duke Energy | Low Flow Groundwater Sampling Plan3.0 PROCEDURES
3
• Obtain site-specific maps or GPS coordinates showing clearly marked
monitoring well locations or groundwater sample points.
• Review the project work control documents such as the Ready-To-Work Plan,
and appropriate SOPs in an effort to determine project-specific sampling
requirements, procedures, and goals.
• Verify that legal right-of-entry has been obtained and site access has been
granted, where required.
• Instruct the field team to avoid discussing project data with the public and to refer
questions to the Project Manager.
3.2 Water-Level Measurements
Prior to pump placement, an initial depth-to-water level and total well depth should be
measured. For monitoring wells screened across the water table, this measurement
shall be used to determine the required depth to the pump intake (typically, approximately
the mid-point of the saturated screen length for low-flow purging and sampling). The
procedure for measuring water levels may include the following:
1) Inspect the well head area for evidence of damage or disturbance. Record
notable observations in the field logbook.
2) Carefully open the protective outer cover of the monitoring well noting the
presence of bee hives and/or spiders, as these animals are frequently found
inside well covers. Remove any debris that has accumulated around the riser near the well plug. If water is present above the top of the riser and well plug,
remove the water prior to opening the well plug. Do not open the well until the
water above the well head has been removed.
3) If practical, well plugs shall be left open for approximately five minutes to allow
the static water level to equilibrate before measuring the water level (if well plugs are vented, then a waiting period is not applicable).
4) Using an electronic water-level indicator accurate to 0.01 feet, determine the
distance between the established point of reference (usually a V-notch or
indelible mark on the well riser) and the surface of the standing water present in
the well. Record these data in the field logbook. Repeat this measurement until two successive readings agree to within 0.01 feet.
5) Using an electronic water-level indicator accurate to 0.01 feet, determine the
distance between the established point of reference (usually a V-notch or
indelible mark on the well riser) and the bottom of the well. Note that there
should not be considerable slack in the water-level indicator cable. Record these data in the field logbook. Repeat this measurement until two successive
readings agree to within 0.01 feet.
6) If the monitoring well has the potential to contain non-aqueous phase liquids
(NAPLs), probe the well for these materials using an optical interface probe.
These wells will be attempted to be identified by the Project Manager prior to
Duke Energy | Low Flow Groundwater Sampling Plan3.0 PROCEDURES
4
mobilizing to the well. If NAPL is present, consult the Project Manager for
direction on collecting samples for analysis. In general, do not collect
groundwater samples from monitoring wells containing NAPL.
7) Decontaminate the water-level indicator (and interface probe, if applicable)
and return the indicator to its clean protective casing.
3.3 Well Purging
Wells must be purged prior to sampling to ensure that representative groundwater is
obtained from the water-bearing unit. If the well has been previously sampled in
accordance with this sampling plan, then the depth to the pump intake and the pumping
rates should be duplicated to the extent possible during subsequent sampling events.
Section 3.3.1 provides a description of low-flow well purging, and Section 3.3.2 provides
a description of volume-averaging well purging (in the case it’s needed).
3.3.1 Low-Flow Well Purging
Adjustable-rate peristaltic, bladder and electric submersible pumps are preferred for use
during low-flow purging and sampling activities. Since purging and sampling are joined
together as one continuous operation, care will be given to pump selection as it applies
to the specific well conditions and analytes to be tested. Note that a ball valve (or similar
valve constructed of polyethylene) may need to be installed to reduce the flow rate to the
required level. The low-flow purging and sampling guidance is provided below:
1) Using the specific details of well construction and current water-level measurement, determine the pump intake set depth (typically the approximate
mid-point of the saturated well screen or other target sample collection depth
adjacent to specific high-yield zones).
2) Attach tubing and supporting rope (if applicable) to the pump and very slowly lower the unit until the pump intake depth is reached. Measure the length of supporting rope required, taking into account the pump length, to attain the
required depth. Record the depth to the pump intake in the field logbook.
Notes: 1) Sampling shall use new certified-clean disposable tubing. 2)
Rope shall be clean, unused, dedicated nylon rope. If a pump is to remain in a well as part of a separate monitoring program, then the rope shall be
suspended within the well above the water column for future use. If the
pump is removed after sample collection, the rope shall be disposed.
3) After allowing time for the water level to equilibrate, slowly lower the electronic
water-level probe into the well until the probe contacts the groundwater. Record the water level in the field logbook.
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4) If the well has been previously sampled using low-flow purging and sampling
methods, begin purging at the rate known to induce minimal drawdown.
Frequently check the drawdown rate to verify that minimum drawdown is being
maintained. If results from the previous sampling event are not known, begin
purging the well at the minimum pumping rate of approximately 100 milliliters per minute (mL/min) (EPA, July 1996). Slowly increase the pumping rate to a level
that does not cause the well to drawdown more than about 0.3 feet, if possible.
Never increase the pumping rate to a level in excess of 500 mL/min
(approximately 0.13 gallon per minute [gpm]). Record the stabilized flow rate, drawdown, and time on the field data sheets.
5) If the drawdown does not stabilize at 100 mL/min (0.026 gpm), continue pumping.
However, in general, do not draw down the water level more than approximately
25% of the distance between the static water level and pump intake depth
(American Society for Testing and Materials [ASTM], 2011). If the recharge rate of the well is lower than the minimum pumping rate but the drawdown is less than 25% of the distance between the static water level and pump intake depth
after three volumes of well water are removed, then collect samples at this point
even though indicator field parameters have not stabilized (EPA, July 1996).
Commence sampling as soon as the water level has recovered sufficiently to collect the required sample volumes. Otherwise, the Volume-Averaging Well Purging method should be considered.Allow the pump to remain undisturbed in
the well during this recovery period to minimize the turbidity of the water samples.
Fully document the pump settings, pumping rate, drawdown, and field parameter
readings on the Well Sampling / MicroPurge (Low Flow) Log in the field logbook.
Note: For wells that either have very slow recharge rates, that draw down excessively (more than 25% of the distance between the static water level and
pump intake depth) at the minimum pumping rate (100 mL/min or 0.026 gpm), or
require a higher pumping rate (greater than 500 mL/min or 0.13 gpm) to maintain
purging, the procedures described above may not apply. For these “special case” wells, the Field Team Leader shall seek guidance from the Project Manager about the appropriate purging and sampling methodologies to be employed (such as
volume-averaged purging and sampling described in Section 3.3.2).
6) Once an acceptable flow rate has been established, begin monitoring designated
indicator field parameters. Indicator parameters are pH, specific conductance, dissolved oxygen (DO), and turbidity. Although not considered purge stabilization parameters, temperature and oxidation reduction potential (ORP) will be
recorded during purging. Base the frequency of the measurements on the time
required to completely evacuate one volume of the flow through the cell to ensure
that independent measurements are made. For example, a 500-mL cell in a system pumped at a rate of 100 mL/min is evacuated in five minutes; accordingly, measurements are made and recorded on the field data form (Appendix C)
approximately five minutes apart.
Indicator parameters have stabilized when three consecutive readings, taken
at three to five-minute intervals, meet the following criteria (EPA, March 2013):
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• pH ± 0.1 standard unit
• Specific Conductance ± 5% in µS/cm
• DO ± 0.2 mg/L or 10% saturation
• Turbidity less than 10 NTUs The target for monitoring turbidity is readings less than ten nephelometric
turbidity units (NTUs). In some instances, turbidity levels may exceed the
desired turbidity level due to natural aquifer conditions (EPA, April 1996).
When these conditions are encountered, the following guidelines shall be
considered.
• If turbidity readings are slightly above 10 NTU, but trending downward,
purging and monitoring shall continue.
• If turbidity readings are greater than 10 NTU and have stabilized to within
10% during three successive readings, attempt to contact the Project
Manager prior to collecting the groundwater sample.
• If turbidity readings are greater than 10 NTU and are not stable, well sampling
shall be based upon stabilization of more critical indicator parameters (such as
dissolved oxygen) without attainment of the targeted turbidity. Attempt to
contact the Project Manger if this condition is encountered prior to collecting
the groundwater sample.
• If after 5 well volumes or two hours of purging (whichever is achieved first),
critical indicator field parameters have not stabilized, discontinue purging and
collect samples. Fully document efforts used to stabilize the parameters
(such as modified pumping rates).
Note: While every effort should be taken to ensure that indicator parameters
stabilize, some indicator parameters are more critical with respect to certain
contaminant types. It is important to identify which indicator parameters are most
important to the project prior to commencement of field activities so that
unnecessarily protracted purge times can be avoided. For example, the critical
indicator parameter associated with metals is turbidity. While it is desirable to
sample wells when turbidity measurements are less than 5 NTU, Duke Energy
recognizes that these values may not be attainable. Duke Energy, and its sub-
consultants, have taken multiple steps (e.g., use of pre-packed screens, carefully
selected sand pack, etc.) to alleviate the potential for elevated turbidity in newly
installed wells. However, even with these conservative and targeted well
installation specifications, other naturally occurring conditions (e.g., iron
fluctuation) may prevent sampling of wells at turbidity values less than 5 NTU.
Following sample collection and laboratory data evaluation, Duke Energy may
review these data with respect to turbidity values to determine if additional well
development is needed or if well construction has affected groundwater
conditions. It may be necessary to redevelop wells from time to time to minimize
Duke Energy | Low Flow Groundwater Sampling Plan3.0 PROCEDURES
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sample turbidity. Fine silt and clay can collect at the base of a well over time.
The effect on future sampling events can be reduced by lowering the tubing or
pump to the bottom of the well (after all the groundwater samples have been
collected) and pumping until the purge water from the bottom of the well screen
is clear.
Note: If purging of a well does not result in turbidity measurements of 10 NTU or
less, the field sampler shall alert the Project Manager. The sampling team will
assess options to reduce the turbidity as soon as possible.
There are a variety of water-quality meters available that measure the water
quality parameters identified above. A multi-parameter meter capable of
measuring each of the water quality parameters referenced previously (except for
turbidity) in one flow-through cell is required. Turbidity shall be measured using
a separate turbidity meter or prior to flow into the flow through cell using an
inline T-valve, if using one multi-meter during purging. The water quality meter
(and turbidity meter) shall be calibrated as per manufacturer’s instructions.
Calibration procedures shall be documented in the project field logbook including
calibration solutions used, expiration date(s), lot numbers, and calibration results.
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3.3.2 Volume-Averaging Well Purging
For wells that either have very slow recharge rates, that draw down excessively at the
minimum pumping rate (100 mL/min or 0.026 gpm), or require a higher pumping rate
(greater than 500 mL/min or 0.13 gpm) to maintain purging (i.e., low-flow well purging
and sampling is not appropriate), the volume-averaging well purging and sampling
method may be used. The Field Team Leader shall seek approval from the Project
Manager before utilizing the volume-averaging method instead of the low-flow method.
3.3.2.1 CALCULATE PURGE VOLUMES
Based on the depth-to-water (DTW) and total depth (TD) measurements, the volume
of standing water in the well must be calculated using the following procedures.
1) Subtract DTW from TD to calculate the length of the standing water column (Lwc) in the well.
ܶܦ െ ܦܹܶ ൌ ܮ௪
2) Multiply the length of the standing water column by the volume calculation
(gallon per linear foot of depth) based on the inner casing diameter (see
example list below) to determine the total standing water volume; this represents
one well volume.
ܸ௪ = ܮ௪ ൈ2ߨݎଶ
1-inch well = 0.041 gallon per linear foot
2-inch well = 0.163 gallon per linear foot
4-inch well = 0.653 gallon per linear foot
6-inch well = 1.469 gallons per linear foot
8-inch well = 2.611 gallons per linear foot
3) Multiply the well volume calculated in the previous step by three and five to obtain the approximate respective total purge volume (the target purge volume is
between three and five standing well volumes). For wells with multiple casing
diameters (such as open bedrock holes), calculate the volume for each segment.
Take the sum of the values and multiply by three and five to determine the minimum and maximum purge volumes, respectively.
4) Fully document the volume calculation in the field logbook or on the Groundwater
Sampling Field Sheets.
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3.3.2.2 PURGE THE MONITORING WELL
Determine the appropriate pump to be used for purging—the preferred and most
commonly used methods involve the use of a surface centrifugal or peristaltic pump
whenever the head difference between the sampling location and the water level is less
than the limit of suction and the volume to be removed is reasonably small. Where the
water level is below the limit of suction or there is a large volume of water to be purged,
use the variable speed electric submersible pump as the pump of choice (EPA, 2013).
In some cases (shallow wells with small purge volumes), purging with a bladder pump
may be appropriate. Once the proper pump has been selected:
1) Set the pump immediately above the top of the well screen or approximately three
to five feet below the top of the water table (EPA, 2013).
2) Lower the pump if the water level drops during purging.
Note: Use new certified-clean disposable tubing for purging and sampling.
Note: Although volume-averaged sampling involves purging a specified volume of
water (such as three to five well volumes) rather than basing purge completion on
the stabilization of water quality indicator parameters, measuring and recording
water-quality indicator parameters during purging provides information that can be
used for assessment and remedial decision-making purposes. Indicator
parameters are pH, specific conductance, DO, and turbidity as described in
Section 3.3.1. Temperature and ORP will also be recorded during purging.
3) During well purging, monitor the discharge rate using a graduated cylinder or
other measuring device, water-quality indicator parameters (if desired), and DTW
as follows:
• Initially, within approximately three minutes of startup,
• Approximately after each well volume is purged, and then
• Before purge completion. 4) Record pump discharge rates (mL/ min or gpm) and pump settings in the field
logbook. Also, record any changes in the pump settings and the time at which
the changes were made.
5) Maintain low pumping rates to avoid overpumping or pumping the well to dryness,
if possible. If necessary, adjust pumping rates, pump set depth, or extend
pumping times to remove the desired volume of water.
6) Upon reaching the desired purge water volume, turn off the purge pump. Do not
allow the water contained in the pump tubing to drain back into the well when the
pump is turned off. Use an inline check valve or similar device, or if using a
peristaltic pump, remove the tubing from the well prior to turning off the pump. It is
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preferred to collect samples within two hours of purging, but acceptable for
collection up to 24 hours of purging. Do not collect samples after 24 hours of
purging.
Note: The removal of three to five well volumes may not be practical in wells
with slow recovery rates. If a well is pumped to near dryness at a rate less than
1.9 L/min (0.5 gpm), the well shall be allowed to completely recover prior to
sampling. If necessary, the two-hour limit may be exceeded to allow for sufficient
recovery, but samples should be collected within 24 hours of purge completion.
3.4 Sampling
3.4.1 Low-Flow Sampling
Following are the procedures for the collection of low-flow groundwater samples.
These procedures apply to sample collection for unfiltered and filtered samples
using a 0.45 micron filter. See Appendix A for use of 0.1 micron filtered samples.
1) Record the final pump settings in the field logbook prior to sample collection.
2) Measure and record the indicator parameter readings prior to sample collection on both the stabilization form and in the field logbook.
3) Record comments pertinent to the appearance (color, floc, turbid) and obvious
odors (such as sulfur odor or petroleum hydrocarbons odor) associated with the
water.
4) Arrange and label necessary sample bottles and ensure that preservatives are added, as required. Include a unique sample number, time and date of sampling,
the initials of the sampler, and the requested analysis on the label. Additionally,
provide information pertinent to the preservation materials or chemicals used in
the sample.
5) Collect samples directly from pump tubing prior to the flow-through cell or via the in-line T-valve used for turbidity measurements (as described Section 3.3.1 (6)
above). Ensure that the sampling tubing remains filled during sampling and
attempt to prevent water from descending back into the well. Minimize turbulence
when filling sample containers, by allowing the liquid to run gently down the inside of the bottle. Fill the labeled sample bottles in the following order:
• Metals and Radionuclides,
• Filtered Metals and Radionuclides, if required, and then
• Other water-quality parameters. 6) Seal each sample and place the sample on ice in a cooler to maintain sample temperature preservation requirements.
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7) Note the sample identification and sample collection time in field logbook and on
Chain-of-Custody form.
8) Once sampling is complete, retrieve the sample pump and associated sampling
equipment and decontaminate in accordance with procedures outlined in the
Decontamination of Equipment SOP (Appendix A).
9) Close and secure the well. Clean up and remove debris left from the sampling
event. Be sure that investigation-derived wastes are properly containerized and
labeled, if applicable.
10) Review sampling records for completeness. Add additional notes as necessary.
3.4.2 Sampling after Volume-Averaging Purge
The procedures described below are for the collection of groundwater samples after a
volume-averaged purge has been conducted. Volume- averaging purge methods are
described in Section 3.3.2.
1) If sampling with a pump, care shall be taken to minimize purge water
descending back into the well through the pump tubing. Minimize turbulence
when filling sample containers by allowing the liquid to run gently down the
inside of the bottle. Fill the labeled sample bottles in the following order:
• Metals and Radionuclides,
• Filtered Metals and Radionuclides, if required, and then
• Other water-quality parameters.
2) If sampling with a bailer, slowly lower a clean, disposable bailer through the
fluid surface. Retrieve the bailer and fill the sample bottles as described above. Care shall be taken to minimize disturbing the sample during
collection.
3.5 Sample Handling, Packing, and Shipping
Samples shall be marked, labeled, packaged, and shipped in accordance with the sections
outline below.
3.5.1 Handling
The samples will be stored in coolers for transport to the site. Collected samples will be placed on ice in the sampling coolers for pickup or transport to the laboratory for
analysis.
3.5.2 Sample Labels
All sample containers will be new, laboratory cleaned and certified bottles. The bottles
will be properly labeled for identification and will include the following information:
• Project Site/ID
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• Sample identifier (Well ID)
• Name or initials of sampler(s)
• Date and time of collection
• Analysis parameter(s)/method
• Preservative
3.5.3 Chain-of-Custody Record
Sample transport and handling will be strictly controlled to prevent sample
contamination. Chain-of-Custody control for all samples will consist of the following:
• Sample containers will be securely placed in coolers (iced) and will remain
under the supervision of project personnel until transfer of the samples to the
laboratory for analysis has occurred.
• Upon delivery to the laboratory, the laboratory director or his designee will sign
the Chain-of-Custody control forms and formally receive the samples. The
laboratory will ensure that proper refrigeration of the samples is maintained.
The Chain-of-Custody document contains information which may include:
• Client name
• Client project name
• Client contact
• Client address
• Client phone/fax number
• Sampler(s) name and signature
• Signature of person involved in the chain of possession
• Inclusive dates of possession
• Sample identification
• Sample number
• Date & time of collection
• Matrix
• Type of container and preservative
• Number of containers
• Sample type - grab or composite
• Analysis parameter(s)/ method
• Internal temperature of shipping container upon opening in the laboratory
3.6 Field Quality Control Samples
Field quality control involves the routine collection and analysis of QC blanks to verify that
the sample collection and handling processes have not impaired the quality of the
samples.
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• Equipment Blank – The equipment blank is a sample of deionized water, which
is taken to the field and used as rinse water for sampling equipment. The
equipment blank is prepared like the actual samples and returned to the
laboratory for identical analysis. An equipment blank is used to determine if
certain field sampling or cleaning procedures result in cross-contamination of site samples or if atmospheric contamination has occurred. One equipment blank
sample will be prepared per day or per 20 groundwater samples, whichever is
more frequent.
Field and laboratory QA/QC also involves the routine collection and analysis of
duplicate field samples. These samples are collected at a minimum rate of
approximately one per 20 groundwater samples per sample event. A field duplicate is a
replicate sample prepared at the sampling locations from equal portions of all sample
aliquots combined to make the sample. Both the field duplicate and the sample are
collected at the same time, in the same container type, preserved in the same way, and
analyzed by the same laboratory as a measure of sampling and analytical precision.
3.7 Field Logbook Documentation
Field logbooks shall be maintained by the Field Team Leader to record daily activities.
The field logbook may include the following information for each well:
• Well identification number
• Well depth
• Static water level depth
• Presence of immiscible layers (yes – no)
• Estimated well yield, if known
• Purge volume and purge pumping rate
• Time well purge began and ended
• Well evacuation procedure and equipment
• Field analysis data
• Climatic conditions including air temperature
• Field observations on sampling event
• Well location
• Name of collector(s)
• Date and time of sample collection
• Sampling procedure
• Sampling equipment
• Types of sample containers used and sample identification numbers
• Preservative used
Duke Energy | Low Flow Groundwater Sampling Plan4.0 REFERENCES
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The Field Team Leader shall review the field logbook entries for completeness and
accuracy. The Field Team Leader is responsible for completion of the required data
collection forms. Example field logs are in Appendix C.
3.8 Decontamination and Waste Management
Sampling equipment decontamination shall be performed in a manner consistent with
the Decontamination of Equipment SOP (Appendix A). Decontamination procedures
shall be documented in the field logbook. Investigation-derived wastes produced
during sampling or decontamination shall be managed in accordance with State and
Station-specific rules for disposal of wastes.
4.0 REFERENCES
American Society for Testing and Materials (ASTM). Standard Practice for Low-Flow
Purging and Sampling for Wells and Devices Used for Ground-Water Quality
Investigations, D 6771-02. 2011.
Test Methods for Evaluating Solid Waste - Physical/Chemical Methods (SW-846), Third Edition. U.S. Environmental Protection Agency. Update I, II, IIA, IIB, III, IIIA, IVA and
IVB.
United States Environmental Protection Agency (EPA), Office of Research and
Development, Office of Solid Waste and Emergency Response. Ground Water Issue,
“Low-Flow (Minimal Drawdown Sampling Procedures). Document Number EPA/540/S-95/504,” April 1996.
U.S. EPA. Region 4, Groundwater Sampling Operating Procedure. Document Number
SESDPROC-301-R3, November 2013.
U.S. EPA. Region I, Low Stress (Low Flow) Purging and Sampling Procedure for the
Collection of Ground Water Samples from Monitoring Wells, Revision 2, July 1996.
Duke Energy | Low Flow Groundwater Sampling PlarDecontamination of Equipment SOP
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A
Decontamination of
Equipment SOP
Duke Energy | Low Flow Groundwater Sampling PlarPurpose & Application
16
1.0 Purpose & Application
This procedure describes techniques meant to produce acceptable decontamination of
equipment used in field investigation and sampling activities. Variations from this SOP
should be approved by the Project Manager prior to implementation and a description of
the variance documented in the field logbook.
2.0 Equipment & Materials
• Decontamination water,
• Alconox detergent or equivalent non-phosphate detergent
• Test tube brush or equivalent
• 5-gallon bucket(s)
• Aluminum foil
• Pump
3.0 Procedure
3.1 Decontamination of Non-Disposable Sampling Equipment
Decontamination of non-disposable sampling equipment used to collect samples for
chemical analyses will be conducted prior to each sampling as described below. Larger
items may be decontaminated at the decontamination pad. Smaller items may be
decontaminated over 5-gallon buckets. Wastewater will be disposed in accordance with
applicable State and Station-specific requirements.
1. Alconox detergent or equivalent and water will be used to scrub the equipment.
2. Equipment will be first rinsed with water and then rinsed with distilled/deionized
water.
3. Equipment will be air dried on plastic sheeting.
4. After drying, exposed ends of equipment will be wrapped or covered with
aluminum foil for transport and handling.
3.2 Decontamination of Field Instrumentation
Field instrumentation (such as interface probes, water quality meters, etc.) will be
decontaminated between sample locations by rinsing with deionized or distilled water. If
visible contamination still exists on the equipment after the rinse, an Alconox (or
equivalent) detergent scrub will be added and the probe thoroughly rinsed again.
Decontamination of probes and meters will take place in a 5-gallon bucket. The
decontamination water will be handled and disposed in accordance with applicable
State and Station-specific requirements.
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3.3 Decontamination of Groundwater Sampling Equipment
Non-disposable groundwater sampling equipment, including the pump, support cable
and electrical wires in contact with the sample will be thoroughly decontaminated as
described below:
1. As a pre-rinse, the pump will be operated in a deep basin containing 8 to 10
gallons of water. Other equipment will be flushed with water.
2. The pump will be washed by operating it in a deep basin containing phosphate-
free detergent solution, such as Alconox, and other equipment will be flushed
with a fresh detergent solution. Detergent will be used sparingly, as needed.
3. Afterwards, the pump will be rinsed by operating it in a deep basin of water and
other equipment will be flushed with water.
4. The pump will then be disassembled and washed in a deep basin containing
non-phosphate detergent solution. All pump parts will be scrubbed with a test
tube brush or equivalent.
5. Pump parts will be first rinsed with water and then rinsed with distilled/deionized
water.
6. For a bladder pump, the disposable bladder will be replaced with a new one for
each well and the pump reassembled.
7. The decontamination water will be disposed of properly.
3.4 Materials from Decontamination Activities
All wastewater and PPE generated from decontamination activities will be handled and
disposed in accordance with applicable State and Station-specific requirements.
Duke Energy | Low Flow Groundwater Sampling PlarSampling Equipment Check List – Table 1
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B
Sampling Equipment
Check List – Table 1
Duke Energy | Low Flow Groundwater Sampling PlarSampling Equipment Check List – Table 1
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Table 1: Suggested Groundwater Sampling Equipment & Material Checklist
Item Description Check
Health & Safety
Nitrile gloves
Hard hat
Steel-toed boots
Hearing protection
Field first-aid kit
Fire Extinguisher
Eyewash
Safety glasses
Respirator and cartridges (if necessary)
Saranex™/Tyvek® suits and booties (if necessary)
Paperwork
Health and Safety Plan
Project work control documents
Well construction data, location map, field data from previous sampling events
Chain-of-custody forms and custody seals
Field logbook
Measuring Equipment
Flow measurement supplies (for example, graduated cylinder and stop watch)
Electronic water-level indicator capable of detecting non-aqueous phase liquid
Sampling Equipment
GPS device
Monitoring well keys
Tools for well access (for example, socket set, wrench, screw driver, T-wrench)
Laboratory-supplied certified-clean bottles, preserved by laboratory (if necessary)
Appropriate trip blanks and high-quality blank water
Sample filtration device and filters
Submersible pump, peristaltic pump, or other appropriate pump
Appropriate sample and air line tubing (Silastic®, Teflon®, Tygon®, or equivalent)
Stainless steel clamps to attach sample lines to pump
Pump controller and power supply
Oil-less air compressor, air line leads, and end fittings (if using bladder pump)
In-line groundwater parameter monitoring device (for example, YSI-556 Multi-Parameter or Horiba U-52 water quality meter)
Turbidity meter
Bailer
Calibration standards for monitoring devices
Duke Energy | Low Flow Groundwater Sampling PlarField Logbook/Data Sheets
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C
Field Logbook/Data
Sheets
Duke Energy | Low Flow Groundwater Sampling PlarField Logbook/Data Sheets
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Groundwater Potentiometric Level Measurement Log
Well Number Time Depth to
Water
(ft)*
Depth to
Bottom
(ft)*
Water
Column
Thickness
(ft)
Reference
Point
Elevation
(ft, MSL)
Potentiometric
Elevation (ft,
MSL)
Remarks
Field Personnel: Checked By:
* - Measurements are referenced from the top of the PVC inner casing (TOC) for each respective monitoring well. TOCs shall be surveyed by a Professional Land Surveyor and referenced to NAVD88.
Duke Energy | Low Flow Groundwater Sampling PlarField Logbook/Data Sheets
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Well Sampling / MicroPurge Log
Project Name: Sheet: of
Well Number: Date:
Well Diameter:
Top of Casing Elevation (ft, MSL): Pump Intake Depth (ft):
Total Well Depth (ft): Recharge Rate (sec):
Initial Depth to Water (ft): Discharge Rate (sec):
Water Column Thickness (ft): Controller Settings:
Water Column Elevation (ft, MSL): Purging Time Initiated:
1 Well Volume (gal): Purging Time Completed:
3 Well Volumes (gal): Total Gallons Purged:
WELL PURGING RECORD
Time Volume
Purged
(gallons)
Flow Rate
(mL/min)
Depth to
Water (ft)
Temperature
(°C)
pH
(s.u.)
Specific
Conductance
(mS/cm)
Dissolved
Oxygen
(mg/L)
ORP
(mV)
Turbidity
(NTU) Comments
Stabilization
Criteria
Min. 1 Well
Volume + 3°C + 0.1 + 3% + 10% + 10 mV
< 5 NTU or + 10
% if > 5 NTU
GROUNDWATER SAMPLING RECORD
Sample
Number
Collection
Time Parameter Container Preservative
Duke Energy | Low Flow Groundwater Sampling PlarField Logbook/Data Sheets
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DAILY FIELD REPORT
Project Name:
Field Manager: Field Personnel: Date:
Weather:
Labor Hours Equipment Materials
Field Observations:
Submitted by: Reviewedby: