Bkgd Soil Dataset Eval_20161213

F)2
Technical Memorandum
Date: Tuesday, December 13, 2016
Project: Cliffside Steam Station
To: Ryan Czop
From: Scott Spinner
Subject: Quantification of Valid Background Soil Samples for Statistical Calculations
The purpose of this memorandum is to provide the basis for evaluation of soil samples proposed for use
in determining site-specific background concentrations using statistical methods. The soil samples
evaluated herein were principally collected during Comprehensive Site Assessment (CSA) fieldwork
conducted between February and June 2015. The locations of soil samples evaluated for use in
background statistical calculations are shown on Figure 1.
Viability of samples for use in statistical calculations was evaluated using the following criteria:
• Soil sample is collected from a location that is not impacted by coal combustion residuals or coal -
associated materials;
• Soil sample is collected from a location that is not impacted by other potential anthropogenic
sources of constituents;
• Soil sample is collected from the unsaturated zone, above the maximum groundwater elevation
measured in shallow wells during eight well gauging events conducted between June 2015 and
September 2016; and
• Soil sample collected from a location not impacted by periodic flooding.
A total of 88 soil samples were collected at Cliffside during CSA activities. Of these 88 samples, 29
samples satisfied the four criteria listed above and are considered viable samples for use in statistical
calculations. These samples were collected from the following locations on-site: BG-1S/D, BG -2D, MW -
30D, MW-32S/D, MW -38D, MW-40BRU, MW -42D, GWA-3D, GWA-6D, GWA-10D, GWA-12BRU, GWA-
21 BRU, GWA-22S, GWA-25D, GWA-27D, and GWA-31 D/BR. Note that viable samples collected from
borings near the waste boundary or down -gradient of ash management areas were collected at least one
foot above the maximum measured groundwater elevation and are assumed to have not been impacted
by groundwater migrating from ash sources.
Soil sampling data used in this evaluation, including the range of groundwater elevations for shallow wells
in each well cluster and analytical results per well are provided in Table 1. Note that laboratory reporting
limit for antimony, arsenic, boron, selenium, and thallium exceeded the North Carolina Protection of
Groundwater (POG) Preliminary Soil Remediation Goals, as revised in October 2016. Revised laboratory
reports that will provide the non -detect values and method detection limits are in the process of being
obtained from the lab.

NOTES:
1. PARCEL DATA FOR THE SITE WAS OBTAINED FROM DUKE ENERGY REAL ESTATE AND IS APPROXIMATE.
2. WASTE BOUNDARY AND ASH STORAGE AREA BOUNDARY ARE APPROXIMATE.
3. AS -BUILT MONITORING WELL LOCATIONS PROVIDED BY DUKE ENERGY.
4. SHALLOW MONITORING WELLS (S) ARE SCREENED ACROSS THE SURFICIAL WATER TABLE.
5. DEEP MONITORING WELLS (D) ARE SCREENED IN THE TRANSITION ZONE BETWEEN COMPETENT BEDROCK AND THE REGOLITH.
6. BEDROCK MONITORING WELLS (BR) ARE SCREENED ACROSS A ROCK FRACTURE ZONE WITHIN COMPETENT BEDROCK.
7. ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP DATED JULY 2015.
8. THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO THE DEFINITION FOUND IN 15A NCAC 02L.0107 (a).
9. HYDROGRAPHY WAS OBTAINED FROM USGS 7.5 -MINUTE SERIES TOPOGRAPHIC MAPS CHESNESS, NC -SC, AND BOILING SPRINGS SOUTH, NC -SC.
SCALE (FEET)
400' 0 400' 800'
511
0
LEGEND:
W
DUKE ENERGY PROPERTY BOUNDARY
ASH BASIN WASTE BOUNDARY
LANDFILL/ASH STORAGE AREA BOUNDARY
ASH BASIN COMPLIANCE BOUNDARY
ASH BASIN COMPLIANCE BOUNDARY COINCIDENT
WITH DUKE PROPERTY BOUNDARY
STREAM
ASH BASIN COMPLIANCE GROUNDWATER
MONITORING WELL
ASH BASIN VOLUNTARY GROUNDWATER
MONITORING WELL
GROUNDWATER MONITORING WELL LOCATION
MONITORING WELL AND SAMPLE LOCATIONS
DUKE ENERGY CAROLINAS, LLC
CLIFFSIDE STEAM STATION ASH BASIN
CLEVELAND AND RUTHERFORD ceUciTiEs, NORTH c-enuriA
190199
DECEMBER 2016
1910111:19

Table 1. Analytical Results
General Notes:
Depth -to -Groundwater data was collected in: 6115,8115,9/15,11/15,12/15,4116,6/16, and 9/16
" - Depth -to -Groundwater range based on data collected from the deep flow layer due to no shallow well present at this location
mg/kg- milligrams per kilogram
NA - Not analyzed or not reported by analytical laboratory
Std. Units - pH units
Comparison Criteria:
NS - No applicable standard for this parameter
Shading indicates exceedance of either applicable criteria.
bold - indicates exceedance of NCDEQ Industrial Health Based PSRG
Italidundedine- indicates exceedance of NCDEQ Protection of
Groundwater PSRG
North Carolina Department of Environmental Quality Division of Waste
Management Soil Remediation Goals Table (October 2016) - Preliminary
Industrial Health Based Soil Remediation Goal (PSRG) and Protection of
Groundwater PSRG.
"Note: No PSRG for Total Chromium is currently available, as a
surrogate the PSRG for Trivalent Chromium was used for comparison
purposes only.
Qualifier Notes:
U - Not detected above the reporting detection limit.
J - Estimated Concentration
J+- Estimated concentration, biased high.
J --Estimated concentration, biased low.
Analyte
Aluminum
Antimony
Arsenic
Barium
Boron
Beryllium
Cadmium
Chromium
Cobalt
Copper
Iron
Lead
Manganese
Mercury
Molybdenum
Nickel
Selenium
Strontium
Thallium
Vanadium
Zinc
Calcium
Chloride
Magnesium
Nitrate
Potassium
Sodium
Sulfate
PH (field)
Total
Organic
Carbon
CAS RN
7429-90-5
7440-36-0
744038-2
7440.39.3
7440-42-8
7440-41.7
7440.43-9
7440-47.3
7440484
7440-50-8
7439-89-6
7439-92.1
7439-96-5
7439-97-6
7439-98-7
7440-02-0
7782.49-2
7440-24-6
7440-28-0
7440.62.2
7440-66.6
7440.70.2
16887-00-6
7439-95-4
14797-55-8
7440-09-7
7440-23-5
14808-79-8
PH
TOC
Result Unit
mglkq
mq/kq
mq/kg
mg/kg
mq/kq
mq/kq
mq/kq
mg/kq
mglkq
mq/kq
mq/kq
mglkn
mq/kq
mq/kq
mq/kq
mq/kq
ma/kg
mq/kq
mq/kq
mq/kq
mq/kq
mg/kq
mq/kq
mq/kq
mq/kg
mq/kq
mg/kq
mq/kq
Std. Units
mq/kq
NC PSRG Ind
100000
94
3
44000
46000
460
200
100000
70
9400
100000
800
5200
8
1200
4400
1200
100000
2.4
1200
70000
NS
NS
NS
100000
NS
NS
NS
NS
NS
NC PSRG POG
NS
0.9
5.8
580
45
63
3
360000
0.9
700
150
270
65
1
NS
130
2.1
NS
0.28
6
1200
NS
NS
NS
NS
NS
NS
NS
NS
NS
Sample Name
Sample Date
Range of Depth -to -
Water ft
BG -1 D(3.5-5)
2/23/2015
20.75-27.15
26100
1.2 U 1
3 U
60.9
3 U
0.54
1 0.14 U
36.4
7.5
15.1 1
35900
24.1
1 75.2
0.0088 J
1 0.6 U
11.3 1
3 U
4.4
1 1.2 U
59.7
69.3 1
179
314 U
1 3400
31.4 UJ
1 2920
104
1 314 U
5.4 J I
NA
BG -1 D 8.5-10
2/23/2015
20.75-27.15
9490
1.1 U
1.4
57.7
13.3 U
1.2
0.13 U
21.9
8.1
23.7
17400
10.3
64.7
0.0087 U
2.7 U4NA
1.4
7.6
0.7 .1
31
92.3
26.5 U
267 U
3520
26.7 UJ
3440
71.2
267 U
5.7 J
NA
BG -1S(3.5-5)
3/17/2015
20.75-27.15
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
4850
BG -1S 8.5-10
3/17/2015
20.75-27.15
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
1870
BG -21) 3.5-5
2/23/2015
42.37-47.79'
30600
1.4 U
3.5 U
108
69.4 U
0.92
0.17 U
84
15.2
31.5
61500
18.9
234
0.012 U
0.97
1.8 J
1.1
1.4 U
110
86.9
130
353 U
7920
35.3 UJ
5830
179
353 U
5.5 J
NA
BG -21)(8.5-10)
2/23/2015
42.37-47.79'
18200
3.2 UJ
3.3 J
131
18.4 J-
0.91
0.38 U
85.5
22
13.5
39100
19.5
591J
0.011 J-
0.64 UJ
3.1 J
3.2 UJ
3.2 U
75.7
30 J-
186 J
NA
4940 J
31 UJ
3350
320 U
NA
5.2 J
NA
BG -21) 18.520
2/23/2015
42.37-47.79•
9980
4.2 U
3.4 J
98.4
21.7
0.65
0.5 U
109
19.3
10.4
22000
15.1
415
0.013 U
0.83 U
8.3
0.83 U
4.2 U
60.1
25.7
48.9
400 U
3060
40 UJ
2430
52.1 J+
400 U
5.5 J
4960 J
BG -21) 28.530
2/23/2015
42.37-47.79'
12700
1.4 U
3.5
148
16.9 U
1.3
0.16 U
71.2
25.6
11.9
16600
11
517
0.01 U
0.68 U1.3
J
0.9
1.4 U
52.9
34.4
38.7
330 U
4810
33 UJ
3580
77.7
330 U
5.7 J
NA
MW -30D(3.55.5)
2/23/2015
38.35-41.15
25200
1.6 U
3.2 J
78.5
3.9 U
0.62
0.19 U
79.9
7.3
12.4
48500
26.7
145
0.013 U
0.78 U2.2
J
1.1
1.6 U
97.8
38.2
220
394 U
5080
39.4 UJ
3380
125
394 U
5.9 J
NA
MW -30D(8.510
2/23/2015
38.35-41.15
18900
4.1 U
2.4 J
37.7
4.1 U
0.42
0.49 U
48.1
3.3 J
11.9
27300
19.9
89
0.034
0.82 U4.1
U
1.6
4.1 U
70.3
22.9
93.1
NA
1930
39.6 UJ
1890
88.5
NA
61
NA
MW -301) 18.5-20
2/23/2015
38.3541.15
10000
1.9 U
3.5 J
34.3
4.7 U
0.82
0.23 U
80.6
2.4 J
19.3
60600
26
1 215
0.016 U
0.94 U 1
16.4
4.7 U
0.94 U
1.9 U
125
19
46.9 U
488 U
793
48.8 UJ
596
154
488 U
51
NA
MW -301) 28.5-30
2/23/2015
38.35-41.15
13300
1.5 U
3.6 J
142
27.3 J
1
0.27
88.6
36.1
24.6
38700
30.1
979
0.012 U
7.7 U
44.6
5.1
7.7 U
1 J
93.8
72.7
385 U
NA
7800
38 UJ
6920
771 U
NA
6.1 J
NA
MW -30S(4-5)
3/10/2015
38.35-41.15
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
1450
MW -30S(9-10)
3/10/2015
38.3541.15
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
1840
MW -30S(19-20)
3/10/2015
38.3541.15
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
865
MW -30S 28-29
3/10/2015
38.3541.15
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
1240
MW -321) 3.5-5
3/4/2015
26.90-35.39
25900
1.2 U
3.8
50.1
30.1 U
0.5 J
0.14 U
79.8
5.7
16.6
48700
24
148
0.038
0.48 J+
11.2
1.6 J
1.4
1.2 U
96.7
22.9
242
317 U
2150
31.7 UJ
1670
113
204 J
5.2 J
2780
MW -32D 8.510
3/4/2015
26.90-35.39
19000
1.2 U
1.9 J
56.5
30.6 U
0.34
0.15 U
50.5
6.7
14.6
44800
27.6
107
0.0099 U
0.39 J
10
3.1 U
2
1.2 U
74.5
27.5
98.8
309 U
2470
30.9 UJ
1920
126
309 U
6i
1740
MW -32D(18.5-20)
3/4/2015
26.90-35.39
8000
1.3 U
1.7
26.3
1 3.3 U
0.14
0.16 U
3.7
3.2
3.1
2760
7.2
62
0.0065 J
0.67 U
6.2
2
13.3
1.3 U
3
1 4.3
5130
1 321 U
61.7
32.1 UJ
120
66.6 U
321 U
5.9 J
796
MW -32S(22.524)
3/12/2015
26.90-35.39
27500
3.9 U
7.9
200
38.9 U
1.6
0.47 U
116
33.8
25.6
46400
13.6
910
0.013 U
7.8 U
49.2 1
3.9 U
1.4 J+
3.9 U
90.1
159
148 J+
387 U
11700
38.7 UJ
8100
83.6
387 U
6.3 J
1480
MW -381)(33.5-35)
3/2/2015
40.15-41.59
8310
1.2 U
3
67.8
3 U
0.31
0.14 U
16.3
43.7
10.7
15100
21
317
0.036
0.44 J+
4.8
1.2 U
4.1
1.2 U
31.7
29.5
163 J+
298 U
2190
29.8 UJ
2640
61.1 J+
298 U
6i
13200
MW40BRU(3.5-5)
3/30/2015
6.81-9.73
39100
6.1 U
6.1 U
353
15.2 U
3
0.73 U
89.2
22.2
14.7
31100
15.3
411
0.0098 U
3 U
38.2
6.1 U
3.9
6.1 U
71.6
94.7
919
295 U
13600
29.5 UJ
8660
304 U
295 U
7.1 J
811
MW -42D(28.5-30)
2/23/2015
33.32-36.51
19800
1.6 U
1.8
195
4 UJ
1.3
0.19 U
85.4
13.1
12
21600
6.4
321
0.014 U
0.81 UJ
40.1
1.1 J
7.1
0.89 J
50.9
53.2
857
423 U
13300
42.3 UJ
9000
95.8
423 U
6.6 J
NA
GWA-3D(48.5-50)
4/16/2015
57.03-60.16'
47600
7.2 R
-3.9 J.
488
17.9 U
4.5 J-
0.86 UJ
144
17.9
14.9 J-
42800
14.1 J-
463
0.011 UJ
3.6 UJ
75.7 J-
6.6 J-
4.5
7.2 UJ
105
103 J-
451
355 UJ
22100
35.5 UJ
14800
358 U
355 UJ
6.5 J
851 U
GWA-61) 28.530
5/8/2015
31.91-39.64
22800
9.7 U
9.7 U
256
24.2 U
2.2
1.2 U
130
20.7
18.4
32800
12.2
601
0.016 U
4.8 U
42.3
9.7 U
10.1
9.7 U
78.8
77
1130
466 U
16500
46.6 UJ
13100
483 U
466 U
6 J
1120 U
GWA-101)(13.5-15)
4/21/2015
18.96-21.80
7080
6.8 UJ
�
45.7
11.1 J
0.41
0.81 U
16.4 J+
5.4 J+
5.7
11100
3.6 J
208
0.011 U
3.4 U
7.5
6.8 UJ
4.2
6.8 U
20.2
22.9
1560 J+
331 U
2220 J
33.1 UJ
1410 J+
339 U
228 J
Z6 J
938
GWA-12BRU 20-23.5
3/31/2015
25.3&26.35
13200
2.7 U
2.7 U
29.8
6.8 J
0.16 J
0.32 U
7.4
3
6.2
7640
14.4
152
0.0086 U
2.7 U
2-5
2.7 U
2.7 U
2.7 U
5
6.2
135 U
266 U
226
26.6 UJ
422
269 U
266 U
6.5 J
378 J
GWA-21 BRU (5)
5/8/2015
10.21-13.00
11400
5.6 U
2.9 J
40
14 U
0.4
0.67 U
14.6
7.1
9.3
19200
20.2
242
0.012 J-
2.8 U
8.1
5.6 U
5.4
5.6 U
22.7
30.1
5380
272 UJ
4030
27.2 UJ
2240
279 U
224 J-
7.8 J
NA
GWA-22S 3-5
5/4/2015
6.358.22
19100
8.1 U
8.1 U
66.9
20.2 U
0.93
0.97 U
30.1
6.6J
9.2
27900
11.7
256
0.029
4 U
7.5
8.1 U
3.9 J
8.1 U
50.4
42.8
175 J
407 U
3630
40.7 UJ
2040
403 U
407 U
9.2 J
2510
GWA-25D(8.5-10)
5/11/2015
19.93-21.57
15800
5.6 U
5.6 U
80
14 U
0.48
0.67 U
28.3
11.8
24.5
23500
8.1
254
0.0089 U
2.8 U
11.4
5.6 U
2.8 U
5.6 U
51.4
65.7
140 U
268 U
3780
26.8 UJ
6150
281 U
268 U
5.1 J
GWA-271)(13.5-15)
3/3/2015
47.59-48.16•
11300
1.2 U
0.95 J
73.6
16.1
0.36
0.15 U
12.4
73.3
15.2
17600
19.7
1240
0.0099 U
0.49 J
9.4
0.65 J
0.39 J
0.74 J
23.8
54.5
30.4 U
292 U
2160
29.2 UJ
3830
60.8 U
292 U
5.5 J
GWA-271) 24.9
6/8/2015
47.59-48.16'
11600
5.1 U
4.8 J
99.7
12.7 U
0.69
0.61 U
17.6
73.8
9.8
24900
9.2
1190
0.0087 U
2.5 U
17
4:5J
2.5 U
5.1 U
30.3
92
127 U
252 UJ
3020
25.2 UJ
5100
254 U
252 U
5.6 J
GWA-31 BR 4
4/21/2015
11.06-16.46'
30000
6.6 U
7.7
174
31.3
1.3
0.79 U
98.8
17.5
21.2
35200
20.6
401
0.019
3.3 U
41.2
6.6 U
5.5
6.6 U
79.9
66.4
1700
317 U
11100
31.7 UJ
8440
329 U
317 U
7.1 J
flNA
GWA-31D(7
4/23/2015
11.06-16.46'
15200
5 U
5 U
140
20.9
0.13 J
0.6 U
69.2
5.8
6.1
22900
5 U
266
0.0077 U
2.5 U
28.8
5 U
2j
5 U
61.5
70.8
1600
262 U
10900
26.2 UJ
12900
133 J
135 J
10.7 J
GWA-31D(8.7)
4/23/2015
11.06-16.46'
15000
5.3 U
4.5 J
113
41.6
0.7
0.64 U
43
7.1
12.7
15500
5.5
403
0.0086 U
1.4 J
24.3
5.3 U
115
5.3 U
37.1
38.8
142000
257 U
8920
25.7 UJ
4910
160 J
162 J
11.5 J
tal Number of Viable Soil Samples»
3629
29
29
29
29
29
29
29
29
29
29
29
29
29
29
29
29
29
29
29
29
29
26
29
29
29
29
26
29
General Notes:
Depth -to -Groundwater data was collected in: 6115,8115,9/15,11/15,12/15,4116,6/16, and 9/16
" - Depth -to -Groundwater range based on data collected from the deep flow layer due to no shallow well present at this location
mg/kg- milligrams per kilogram
NA - Not analyzed or not reported by analytical laboratory
Std. Units - pH units
Comparison Criteria:
NS - No applicable standard for this parameter
Shading indicates exceedance of either applicable criteria.
bold - indicates exceedance of NCDEQ Industrial Health Based PSRG
Italidundedine- indicates exceedance of NCDEQ Protection of
Groundwater PSRG
North Carolina Department of Environmental Quality Division of Waste
Management Soil Remediation Goals Table (October 2016) - Preliminary
Industrial Health Based Soil Remediation Goal (PSRG) and Protection of
Groundwater PSRG.
"Note: No PSRG for Total Chromium is currently available, as a
surrogate the PSRG for Trivalent Chromium was used for comparison
purposes only.
Qualifier Notes:
U - Not detected above the reporting detection limit.
J - Estimated Concentration
J+- Estimated concentration, biased high.
J --Estimated concentration, biased low.