Riverbend- SOIL BTV Tech Memo

TECHNICAL MEMORANDUM
Date: August 4, 2017 File: 1026.15
To: Sean DeNeale (Duke Energy)
Cc: Kathy Webb (SynTerra)
From: Judd Mahan (SynTerra) V I&%
Subject: Background Threshold Values for Soil
Riverbend Steam Station — Mount Holly, NC
An updated background soil dataset was provided to the North Carolina Department of
Environmental Quality (NCDEQ) for Riverbend Steam Station (Riverbend) on May 26, 2017.
Additionally, the revised Statistical Methods for Developing Reference Background Concentrations for
Groundwater and Soil at Coal Ash Facilities (statistical methods document) (HDR Engineering, Inc.
and SynTerra Corporation, May 2017) was provided to NCDEQ. On July 7, 2017, NCDEQ
provided a response letter (Zimmerman to Draovitch, July 7, 2017) for each Duke Energy coal
ash facility that identified soil and groundwater data appropriate for inclusion in the statistical
analysis to determine background threshold values (BTUs) for both media. As outlined in the
NCDEQ July 7, 2017 letter, Duke Energy is required to provide BTVs for both media within 30
days from receipt of the NCDEQ letter for facilities submitting Comprehensive Site
Assessments (CSAs) by October 31, 2017, and 60 days from receipt of the NCDEQ letter for all
other facilities. The background threshold values for groundwater are provided under separate
cover.
The revised background soil datasets provided to NCDEQ on May 26, 2017 incorporated
comments provided in a letter by NCDEQ (Zimmerman to Draovitch, April 28, 2017). NCDEQ
requested that Duke Energy collect a minimum of 10, rather than the previously planned eight,
valid background samples prior to the determination of BTVs for each constituent. For soil
datasets with less than 10 valid samples available for BTV determination, no formal upper
tolerance limit (UTL) statistics will be run and the provisional BTV for a constituent will be
computed to be either:
h The highest value, or
101 If the highest value is above an order of magnitude greater than the geometric mean
of all values, then the highest value should be considered an outlier and removed
from further use and the PBTV is computed to be the second highest value.
P: \ Duke Energy Carolinas \ Statistics_CAMA \ Background Determinations for NCDEQ July 7 2017 \ BTV
TECH MEMO \ Riverbend \ Soil \ Riverbend- SOIL BTV MEMO_FINAL.docx

Background Threshold Values for Soil August 4, 2017
Riverbend Steam Station
Soil samples meeting the following criteria are considered valid for use in statistical
determinations of BTVs:
h Sample was collected from a location that is not impacted by coal combustion
residuals or coal associated materials;
h Sample was collected from a depth not less than 0.5 feet below ground surface;
01 Sample was collected from a location that is not impacted by other potential
anthropogenic sources of constituents; and
Page 2 of 3
01 Sample is collected from the unsaturated zone, greater than one foot (ft) above the
seasonal high water table elevation.
Additional site -specific requirements related to the Riverbend background soil dataset as
outlined in the July 7, 2017 NCDEQ letter have been incorporated into the soil background
dataset.
This technical memorandum summarizes the revised background soil datasets and statistically
determined BTVs. Statistical determinations of BTVs were performed in accordance with the
revised Statistical Methods for Developing Reference Background Concentrations for Groundwater and
Soil at Coal Ash Facilities (statistical methods document) (HDR Engineering, Inc. and SynTerra
Corporation, May 2017).
SOIL BACKGROUND DATA
Soil samples were collected from soil borings conducted at the Riverbend Plant during the 2015
Comprehensive Site Assessment (CSA). Background soil sample locations are presented in
Figure 1. The background dataset provided to NCDEQ on May 26, 2017 included pooled soil
samples collected from multiple depth intervals. Only samples collected from background
locations at depth intervals greater than one foot above the seasonal high water table were
included in the dataset. The background soil dataset has been further revised from the May 26,
2017 submittal based on input from NCDEQ in the July 7, 2017 letter. NCDEQ determined the
following samples are not appropriate for use in determining BTVs:
0 GWA-3D (18.5-19)— collected downgradient of the ash and cinder storage area;
h GWA-7S (7.0-8.0) and GWA-8D (8.5-10) — collected down -gradient of the ash basin;
0 GWA-9D (1), GWA-10S (8-9), and MW-15D (3.5-5) — downgradient location which
may be within the high seasonal water table.
0 GWA-20D (40-41.5) and GWA-22D (38.5-40.0) — collected in close proximity to the
ash storage area
P: \ Duke Energy Carolinas \ Statistics_CAMA \ Background Determinations for NCDEQ July 7 2017 \ BTV
TECH MEMO \ Riverbend \ Soil \ Riverbend- SOIL BTV MEMO_FINAL.docx

Background Threshold Values for Soil August 4, 2017
Riverbend Steam Station
Page 3 of 3
0 GWA-23D (33.5-35) — collected within the waste boundary of the ash storage area
0 OB-1 (33.5-35) — collected in close proximity to the ash basin.
Prior to statistical determinations, the background soil dataset was re -screened for outliers to
adjust for the removal of samples from the dataset. A revised background soil dataset
identifying valid samples and statistical outliers is presented as Table 1. Currently, the
background dataset satisfies the minimum requirement of 10 samples to use formal statistics to
derive BTVs for all constituents except antimony, selenium, and thallium. The background soil
dataset for these constituents included laboratory reporting limits above the NCDEQ IHSB
Preliminary Soil Remediation Goals (PSRG) Protection of Groundwater standards (dated
October 2016). NCDEQ requested the values for antimony, selenium, and thallium be reported
below the PSRG Protection of Groundwater.
BTVs were calculated using formal UTL statistics for constituent datasets meeting the minimum
requirement of 10 samples. Antimony, selenium, and thallium datasets were comprised of zero
valid samples. BTVs for constituents in site soil are provided in Table 2.
Additional soil samples were collected on July 27- 28, 2017 to satisfy the minimum number of
soil samples and provide antimony, selenium, and thallium below the PSRG Protection of
Groundwater values. The analysis of the additional background soil samples are not complete
at the time of this technical memo. Therefore, as previously stated, PBTVs for soil constituents
were computed and are provided in Table 2. Boring logs associated with the additional soil
samples are included in Attachment 1. Additional analytical data will be submitted to the
NCDEQ Regional Office if received and processed in sufficient time for review prior to the
preparation of the updated CSA report.
LIST OF FIGURES
Figure 1— Background Soil Sample Location Map
LIST OF TABLES
Table 1— Background Unsaturated Soil Data Summary
Table 2 — Background Threshold Values for Soil
LIST OF ATTACHMENTS
Attachment 1- Soil Boring Logs (Additional Samples)
P: \ Duke Energy Carolinas \ Statistics_CAMA \ Background Determinations for NCDEQ July 7 2017 \ BTV
TECH MEMO \ Riverbend \ Soil \ Riverbend- SOIL BTV MEMO_FINAL.docx

NOTES:
ALL BOUNDARIES ARE APPROXIMATE.
•
SITE AERIAL ORTHOPHOTOGRAPHY OBTAINED FROM USDA FSA
NAIP, DATED 05/27/2016.
DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH
CAROLINA STATE PLANE COORDINATE SYSTEM FIPS 3200
(NAD83/2011).
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GRAPHIC SCALE
300 150 0 300 600
1148 RIVER STREET, SUITE 220 I
GREENVILLE, SOUTH CAROLINA 29601
PHONE [phone]
DRAWN BY: A. ROBINSON DATE: 07/28/2017
PROJECT MANAGER: J. MAHAN
CHECKED BY: B. WYLIE
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♦
e BG-3D •
1
•
1
BG-2D
•
LEGEND
O ADDITIONAL BACKGROUND SOIL
SAMPLE LOCATION
® EXISTING BACKGROUND SOIL SAMPLE
LOCATION -ACCEPTED BY NCDEQ
WASTE BOUNDARY
COMPLIANCE BOUNDARY
r DUKE POWER RIVERBEND PLANT
BOUNDARY
FIGURE 1
BACKGROUND SOIL
SAMPLE LOCATION
RIVERBEND STEAM STATION
MOUNT HOLLY, NORTH CAROLINA

TABLE 1
BACKGROUND UNSATURATED SOIL DATA SUMMARY
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC, MOUNT HOLLY, NC
Analytical Parameter
pH
Aluminum
Antimony
Arsenic
Barium
Boron
Beryllium
Cadmium
Calcium
Chloride
Chromium
Cobalt
Copper
Iron
Lead
Magnesium
Manganese
Mercury
Molybdenum
Nickel
Nitrate
(as N)
potassium
Selenium
Sodium
Strontium
Sulfate
Thallium
Vanadium
Zinc
Reporting Units
S.U.
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
PSRG Protection of Groundwater
NE
NE
0.9
5.8
580
63
45
3
NE
NE
360000
0.9
700
150
270
NE
65
1
NE
130
NE
NE
2.1
NE
NE
NE
0.28
6
1200
Sample ID
Sample
Collection Date
Analytical Results
BG-1D (5-6)
6/3/2015
4.6 j
12100
---
---
20.4
16.2 U
0.32 U
0.78 U
162 U
321 U
9
---
11.6
32200
13.7
162 U
29.1
0.048
3.2 U
1.3 j
NA
325 U
---
325 U
3.2 U
321 U
---
89.2
6.5 U
3G-1D (14-15)
6/3/2015
5.6 j
11600
---
---
77.3
20.7 U
0.41 U
0.99 U
207 U
427 U
5.5
5 j
15.1
26800
4.9 j
2750
226
0.0095 j
4.1 U
3.4
NA
2580
---
414 U
4.1 U
427 U
---
70.2
12.5
3G-1D (24-25)
6/3/2015
5 j
14100
---
---
175
20.5 U
0.25 j
0.98 U
205 U
394 U
5.4
22.8
25.2
28200
6 j
7340
1140
0.013 U
4.1 U
6.4
NA
6500
---
410 U
4.1 U
394 U
---
75.8
34.7
BG-2D (3.5-5)
6/13/2015
6.1j
15700
---
5.5 j
17.7 j
15.3 U
0.2j
0.73 U
451
301 Uj
33
---
8.1
36500
10.9
308
11.4
0.55
3.1 U
1.5 U
NA
1920
---
306 U
3.9
175j-
---
89.2
7.7
j-
BG-21) (48-49)
6/15/2015
4.5j
10700
---
---
161
15.8 U
0.63
0.76 U
NA
NA
6
14.6
5.3
17100
15.2
NA
290
0.01 Uj
3.2 U
4.5
NA
NA
---
NA
7.2
NA
---
43.9
45.7
BG-3D (3-5)
6/13/2015
4.8 j
23100
---
---
28.4
15.7 U
0.33
0.75 U
157 U
313 U
17.4
---
11.4
34100
18.1
526
114
0.027 j+
3.1 U
6.7
31.3 U
586
---
314 U
1.7 j
313 U
---
67.5
24.6
3G-3D (18.5-20)
6/13/2015
6 j
26000
---
---
240
15.4 U
0.66
0.74 U
i150
309 U
14.4
14.6
16.4
23800
4.2 j
8030
943
0.01 U
3.1 U
8.3
30.9 U
6450
---
307 U
10.4
309 U
---
62.3
43
BG-31) (23-24)
6/13/2015
5.8 j
26700
---
276
15.6 U
0.84
0.75 U
3420
NA
6.1
11
10.4
18100
3.7 j
7660
626
0.01 U
3.1 U
7.6
31.8 U
6410
---
311 U
i6.2
NA
---
45.4
45.8
GWA-5D (58.5-60)
4/10/2015
5.2 j
3340
---
---
28.7
17.2 U
0.22 j
0.83 U
172 U
341 U
3.2
13.5
7.1
18600
4.5j
172 U
477
0.011 U
3.4 U
1.7 U
NA
344 U
---
344 U
3.4 U
341 U
---
33.6
6.8j
GWA-6D-1 (43.5-45)
3/4/2015
5.4 j
2380
---
3.4 U
75.5
14.9
0.29 j
0.41 U
34.1 U
353 U
7.3 j+
25.4
23.2
19000
4.6
92.1j+
1270
0.01 U
0.68 U
4.2 j+
NA
105 j+
---
68.1 U
0.68 U
353 U
---
55.8
3.6 j+
GWA-6D-2 (48.5-50)
3/4/2015
5.5 j
13200
---
4.4 U
176
16.2
0.3 j
0.53 U
4250
446 Uj
1.2 j+
10.5
28.1
18200
2.6 j
8830
523
0.01 U
0.89 U
2.4 j+
NA
8320
---
156 j+
24.8
446 U
---
55.5
56.7 j+
GWA-21D (3.5-5)
7/15/2015
5 j
37400
---
12.2
37.7
21.4 U
0.41 j
1 U
379
402 U
624
---
7.6
64000
20.9
232
153
0-.54
4.3 Uj
3.5
40.2 Uj
275 j
---
427 U
7.1
402 U
---
NA
17.3
GWA-21D (8.5-10)
7/16/2015
5 j
5430 j+
---
3.6 j
2.5 j+
14.8 Uj
0.3 U
0.71 U
NA
NA
17.7 j+
---
5.2 j+
38300
3.2 j
NA
92.7
0.0077 j
3 Uj
1.5 Uj
29.4 Uj
NA
---
NA
3 Uj
NA
---
NA
5.9 Uj
GWA-21D (18.5-20)
7/16/2015
5 j
4250
---
---
3.7 Uj
18.4 U
0.44
0.88 U
184 Uj
369 U
16.9 j+
5.3 j
7.9 j+
26600
7.4 Uj
184 Uj
68.4
0.0098 j
3.7 Uj
10.2
36.9 Uj
368 Uj
---
368 Uj
3.7 Uj
369 U
---
NA
35.5 j+
GWA-21D (48.5-50)
7/18/2015
5.2 j
2070
---
---
113
15.7 Uj
0.24 j
0.75 U
NA
NA
3.2
4.5 j
16
14300
6.3 U
NA
592
0.01 Uj
3.1 Uj
2.9
30.2 Uj
NA
---
NA
3.1 U
NA
---
NA
20.2
MW-7BR (43.5-45)
4/24/2015
5.4 j
5650 j
---
---
31.3
12 j
0.32 U
0.77 U
160 U
323 U
3.6
7.3 j
4.5
12300 j
3.7 j+
620
446j
0.01 U
3.2 Uj
2.4
NA
216 j+
NA
321 U
3.2 U
323 U
---
29.2
6.6
OB-2 (38.5-40.0)
4/14/2015
5.5 j
14400
---
---
157
26.7
1.2
1.1 U
155 j
488 U
2.7
36.1
7"
41000
9.5 U
4330
1950
0.015 U
4.7 U
11.4
NA
2440
---
474 U
3 j
488 U
---
130
60.8
Prepared by: JHG Checked by: LWD
Notes:
54 Indicates values omitted from dataset.
--- Not applicable; non -detect concentration greater than PSRG Protection of Groundwater; value omitted
Indicates data removed/identified as an outlier
j - Estimated concentration above the adjusted method detection limit and below the adjusted reporting limit.
j- - Estimated concentration, biased low.
j+ - Estimated concentration, biased high.
mg/kg - milligrams per kilogram
NA - Not analyzed
NE - Not established
PSRG Protection of Groundwater - NCDEQ IHSB Preliminary Soil Remediation Soil Remediation Goals Table - October 2016
S.U. - Standard Units
U = Results not detected at concentrations which equal the laboratory's method reporting limit.
P:\Duke Energy Ca rolinas\Statistics_CAMA\Backg round Determinations for NCDEQ July 7 2017\13TV TECH MEMO\Riverbend\Soil\Tables\TABLE 1 - Riverbend BG Soils_Outliers_TM Page 1 of 1

TABLE 2
BACKGROUND THRESHOLD VALUES FOR SOIL
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC, MOUNT HOLLY, NC
Parameter
Reporting Unit
PSRG Protection
of Groundwater
BTV
pH*
S.U.
NE
4.0 - 6.6
Aluminum
mg/kg
NE
38147
Antimony
mg/kg
0.9
NA
Arsenic
mg/kg
5.8
12.2t
Barium
mg/kg
580
305
Beryllium
mg/kg
63
0.84
Boron
mg/kg
45
21.4
Cadmium
mg/kg
3
ND
Calcium
mg/kg
NE
451
Chloride
mg/kg
NE
ND
Chromium
mg/kg
360,000
42.6
Cobalt
mg/kg
0.9
40.4
Copper
mg/kg
700
39.4
Iron
mg/kg
150
67463
Lead
mg/kg
270
18.1
Magnesium
mg/kg
NE
8830
Manganese
n-i
65
3374
Mercury
mg/kg
1
0.027
Molybdenum
mg/kg
NE
ND
Nickel
mg/kg
130
12.4
Nitrate (as N)
mg/kg
NE
40.2t
Potassium
mg/kg
NE
8320
Selenium
mg/kg
2.1
NA
Sodium
mg/kg
NE
ND
Strontium
mg/kg
NE
7.2
Sulfate
mg/kg
250
ND
Thallium
mg/kg
0.28
NA
Vanadium
mg/kg
6
138
Zinc
mg/kg
1200
72.9
Prepared by: JHG / LWD Checked by: LWD / TCK
Notes:
S.U. - Standard Unit
mg/kg - milligrams per kilogram
* - Upper and lower threshold values calculated for parameter
t - Indicates value is provisional; dataset contains less than 10 valid samples
ND - Not Detected
NE - Not Established
NA - Not applicable; dataset contains zero valid samples
P:\Duke Energy Carolinas\Statistics_CAMA\Background Determinations for NCDEQ July 7 2017\13TV TECH MEMO
\Riverbend\Soil\Tables\TABLE 2 - Riverbend Soil BTVs Page 1 of 1

Background Threshold Values for Soil
August 4, 2017
Riverbend Steam Station
ATTACHMENT 1
SOIL BORING LOGS (ADDITIONAL SAMPLES)
P: \ Duke Energy Carolinas \ Statistics_CAMA \ Background Determinations for NCDEQ July 7 2017\BTV
TECH MEMO\ Riverbend \ Soil \ Riverbend- SOIL BTV MEMO_FINAL.docx

PROJECT: DEC Riverbend
WELL / BORING NO: BGSB-4
PROJECT NO: 1026.15
STARTED: 7/27/17 COMPLETED: 7/27/17
DRILLING COMPANY: Geologic Exploration
NORTHING: 592378.47 EASTING: 1414888.646
DRILLING METHOD: GeoProbe
ELEVATION ft M.P. ELEV: ft
BOREHOLE DIAMETER: 3 IN
WATER: ft TOC TOTAL DEPTH: 15.0 ft BGS
NOTES: Coordinates obtained with hand held GPS unit.
LOGGED BY: B. Wylie CHECKED BY: A. Lefitz
H
U
w
O
c4
�
zU
_a-
ECL0U)
WELL
W"
DESCRIPTION
g
U
W
m 0
CONSTRUCTIONQ
U
U
U
CL
Hard red sandy clay with sub -rounded gravel, dry,
medium plasticity, non -cohesive.
5
Hard red sandy clay with sub -rounded gravel and light
CL
brown sand grains, dry, medium plasticity,
non -cohesive.
10
Hard red sandy clay with sub -rounded gravel and light
CL
brown sand grains, dry, medium plasticity,
non -cohesive.
CH
Red clay with sand, dry, plastic, cohesive.
15
20
25
30
35
CLIENT: Duke Energy Carolinas, LLC
SynTerra
148 River Street, Suite 220 PROJECT LOCATION:
Pho999
n864
SynTerra Fax: 679-371�11 PAGE 1 OF 1

PROJECT: DEC Riverbend
WELL / BORING NO: BGSB-rJ
PROJECT NO: 1026.15
STARTED: 7/27/17 COMPLETED: 7/27/17
DRILLING COMPANY: Geologic Exploration
NORTHING: 592761.758 EASTING: 1415348.822
DRILLING METHOD: GeoProbe
ELEVATION ft M.P. ELEV: ft
BOREHOLE DIAMETER: 3 IN
WATER: ft TOC TOTAL DEPTH: 15.0 ft BGS
NOTES: Coordinates obtained with hand held GPS unit.
LOGGED BY: B. Wylie CHECKED BY: A. Lefitz
H
U
w
O
c4
�
zO
_a
ECL0U)
WELL
W"
DESCRIPTION
g
U
W
m 0
CONSTRUCT
IONQ
O
O
cA
U
ML
Dark brown silt, dry, non -plastic, non -cohesive.
5
CH
Dark brown clay with some silt and sand, dry, plastic,
cohesive.
SM
dark brown sand with silt, moist, non -cohesive.
10
CL
Brown red clay, dry, plastic, cohesive.
CH
Stiff red clay with sand, moist to dry, medium plasticity.
15
20
25
30
35
CLIENT: Duke Energy Carolinas, LLC
SynTerra
148 River Street, Suite 220 PROJECT LOCATION:
Pho999
n864
SynTerra Fax: 679-371�11 PAGE 1 OF 1

PROJECT: DEC Riverbend
WELL / BORING NO: BGSB-G
PROJECT NO: 1026.15
STARTED: 7/27/17 COMPLETED: 7/27/17
DRILLING COMPANY: Geologic Exploration
NORTHING: 591563.361 EASTING: 1412422.008
DRILLING METHOD: GeoProbe
ELEVATION ft M.P. ELEV: ft
BOREHOLE DIAMETER: 3 IN
WATER: ft TOC TOTAL DEPTH: 15.0 ft BGS
NOTES: Coordinates obtained with hand held GPS unit.
LOGGED BY: B. Wylie CHECKED BY: A. Lefitz
a
U
a 0
Cn
Uj
a
O
o z
o Q
WELL
w V
DESCRIPTION
Q
w
m
a Q
CONSTRUCTION
ML
Stiff brown silt with clay, dry, non -plastic.
CH
Red clay with silt, dry, plastic, cohesive.
5
ML
Red silt with clay, dry, non -plastic, non -cohesive.
10
ML
Red silt with clay Regolith, dry, non -plastic,
non -cohesive, with white mottles and some structure.
15
20
25
30
35
CLIENT: Duke Energy Carolinas, LLC
SynTerra
148 River Street, Suite 220 PROJECT LOCATION:
MTerra Phone: -9999
s
.�)/� �1 Fax:[phone] PAGE 1 OF 1
-679- 711

PROJECT: DEC Riverbend
WELL / BORING NO: BGSB-7
PROJECT NO: 1026.15
STARTED: 7/27/17 COMPLETED: 7/27/17
DRILLING COMPANY: Geologic Exploration
NORTHING: 592761.006 EASTING: 1415830.707
DRILLING METHOD: GeoProbe
ELEVATION ft M.P. ELEV: ft
BOREHOLE DIAMETER: 3 IN
WATER: ft TOC TOTAL DEPTH: 15.0 ft BGS
NOTES: Coordinates obtained with hand held GPS unit.
LOGGED BY: B. Wylie CHECKED BY: A. Lefitz
a
U
a 0
a
O
o z
o Q
WELL
w V
DESCRIPTION
Q
w
m
a Q
CONSTRUCTION
SM
Brown sand with silt, organics, and some gravel, dry.
5
MH
Red to light brown silty saprolite, regolith, relict
structures and mottles.
10
MH
Brown silt with minor fine sand and white mottles, not
much structure.
15
20
25
30
35
CLIENT: Duke Energy Carolinas, LLC
SynTerra
148 River Street, Suite 220 PROJECT LOCATION:
MTerra Phone: -9999
s
.��/� �1 Fax:[phone] PAGE 1 OF 1
-679- 711

PROJECT: DEC Riverbend
WELL / BORING NO: BGSB-H
PROJECT NO: 1026.15
STARTED: 7/27/17 COMPLETED: 7/27/17
DRILLING COMPANY: Geologic Exploration
NORTHING: 593115.196 EASTING: 1416274.469
DRILLING METHOD: GeoProbe
ELEVATION ft M.P. ELEV: ft
BOREHOLE DIAMETER: 3 IN
WATER: ft TOC TOTAL DEPTH: 15.0 ft BGS
NOTES: Coordinates obtained with hand held GPS unit.
LOGGED BY: B. Wylie CHECKED BY: A. Lefitz
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DESCRIPTION
Uj
a
Q
(n
O
w
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U
o Q
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WELL
CONSTRUCTION
MH
Dark red silt with sand and some gravel, dry,
fine-grained.
5
MH
Dark red brown silt with clay regotlith and fine sandy
zones, dry. Weathered, clay mottles.
10
15
20
25
30
35
CLIENT: Duke Energy Carolinas, LLC
SynTerra
148 River Street, Suite 220 PROJECT LOCATION:
MTerra Phone: -9999
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.�)/� �1 Fax:[phone] PAGE 1 OF 1
-679- 711

PROJECT: DEC Riverbend
WELL / BORING NO: BGSB-9
PROJECT NO: 1026.15
STARTED: 7/27/17 COMPLETED: 7/27/17
DRILLING COMPANY: Geologic Exploration
NORTHING: 591043.984 EASTING: 1410107.754
DRILLING METHOD: GeoProbe
ELEVATION ft M.P. ELEV: ft
BOREHOLE DIAMETER: 3 IN
WATER: ft TOC TOTAL DEPTH: 15.0 ft BGS
NOTES: Coordinates obtained with hand held GPS unit.
LOGGED BY: B. Wylie CHECKED BY: A. Lefitz
H
w
U
IL0
O
0
j
DESCRIPTION
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a
Q
cA
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m =O
U
0 E
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WELL
CONSTRUCTION
SM
Medium gray to brown silty sand, moist to dry,
non -plastic, non -cohesive.
5
10
MH
Red silty clay, moist to wet, medium plasticity,
cohesive.
SM
Gray fine to medium silty sand, dry, non -plastic.
`
SM
Saprolite, silty sand with minor structure, moist to dry,
non -plastic, semi -cohesive.
15
20
25
30
35
CLIENT: Duke Energy Carolinas, LLC
SynTerra
148 River Street, Suite 220 PROJECT LOCATION:
Pho999
n864
SynTerra Fax: 679-371�11 PAGE 1 OF 1