Asheville Background Soil Tech Memo Dec 2016

TECHNICAL MEMORANDUM
Date: December 15, 2016 File: 1026.102.19
To: John Toepfer (Duke Energy)
Cc: Kathy Webb ( Ter )
From: Todd PlatingValhid
Subject: Quantification of Background Soil Samples for Statistics Calculations —
Asheville Steam Electric Plant
Proposed Preliminary Background Threshold Values (PPBTVs) for site soils will be calculated
for CAMA assessment constituents. Soil samples were collected from soil borings during the
Comprehensive Site Assessment (CSA) field activities at the Asheville Steam Electric Plant (Site)
in 2015. Table 1 provides a summary of the samples (locations and depth intervals) which are
considered for use in statistical calculations to determine concentrations of naturally occurring
(background) inorganic constituents in Site soil. Figure 1 indicates the location of soil samples
to be used for statistical calculations.
Soil samples that meet the following criteria are considered valid for use in the statistic
calculations for background concentrations:
,01 Soil sample is collected from a location that is not impacted by coal combustion
residuals or coal associated materials;
0 Soil sample is collected from a location that is not impacted by other potential
anthropogenic sources of constituents; and
E7 Soil sample is collected from the unsaturated zone, > 1 ft. above the seasonal high water
table elevation.
Eight additional samples have been eliminated from the statistical calculations. The samples
collected from the MW -1 boring location are currently unsaturated, however, were likely
saturated when the 1982 ash basin was in use. Additionally, locations along the French Broad
River (MW -15, MW -16, MW -17, MW -18, and MW -20) are periodically inundated and seepage
flow within the floodplain may contribute anthropogenic sources of constituents to the soil.
Based on the minimum eight sample dataset requirement provided in the Pro UCL guidance
document, no additional background soil samples are projected for the Site.
The analytical results presented in Table 1 for antimony, arsenic, selenium, and thallium
present reporting limits that are greater than the PSRG for Protection of Groundwater (POG),
for some or all samples, 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.
P: \ Duke Energy Progress.1026 \ 02.ASHEVILLE PLANT \ 40. 1982 Basin Closure Soil Sampling \ Stats \ Final BG Soil
Tech Memo.docx

Quantification of Valid Background Soil Samples for Statistics Evaluation December 15, 2016
Asheville Steam Electric Plant
Page 2 of 2
The statistical calculation process will include a review of data to determine if outliers exist.
Professional judgment can be used to retain data that does not satisfy one or more of the valid
soil sample criteria. Likewise, professional judgement can be used to reject soil sample data
that does satisfy all valid soil sample criteria. However, the decision to retain data that does not
satisfy valid soil sample criteria, and the decision to reject data that satisfy valid soil sample
criteria, must be documented. A revised Background Soil Data Summary table will be provided
following review of updated analytical reports.
ATTACHMENTS: Table 1: Background Soil Data Summary
Figure 1: Background Soil Locations for Statistical Analysis
P: \ Duke Energy Progress.1026 \ 02.ASHEVILLE PLANT \ 40. 1982 Basin Closure Soil Sampling \ Stats \ Final BG Soil
Tech Memo.docx

TABLE 1
BACKGROUND SOIL DATA SUMMARY
ASHEVILLE STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, ARDEN, NC
Prepared by: JHG/BDW Checked by: TDP
Notes:
0 Concentration or detection limit greater than PSRG Protection of Groundwater Standard
mg/kg = milligrams per kilogram
NE = Not established
S.U. = Standard Units
j = Estimated concentration above the adjusted method detection limit and below the adjusted reporting limit.
< = concentration not detected at or above the adjusted reporting limit.
= No detectable concentrations within data set
PSRG Protection of Groundwater = NCDEQ IHSB Preliminary Soil Remediation Soil Remediation Goals Table - October 2016
= Water table elevations collected during site -wide well gauging event on September 21, 2016.
P:\Duke Energy Progress. 1026\02.ASH EVILLE PLANT\40. 1982 Basin Closure Soil Sampling\Stats\FINAL Background Soil Data Sum_REV1.xisx Page 1 of 1
Analytical Parameter
pH
Aluminum
Antimony
Arsenic
Barium
Beryllium
Boron
Cadmium
Calcium
Chloride
Chromium
Cobalt
Copper
Iron
Lead
Magnesium
Manganese
Mercury
Molybdenum
Nickel
Nitrate
tN)
(asReporting
Potassium
Selenium
Sodium
Strontium
Sulfate
Thallium
Vanadium
Zinc
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
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
Sample Depth
Elevation (ft.)
Water Table
Elevation (ft.)'Analytical
Results
CB -01 SB (7-8)
04/10/2015
2202
2163.42
5.8
14100
<2.9
<2.9
57.2
0.63
<14.3
<0.34
<143
<292
14.3
18
17.1
23400
8.8
1780
279
<0.0094
<2.9
6.9
<29.2
1730
<2.9
<286
<2.9
<292
<2.9
27.3
77.3
CB -01 SB (30-31)
04/10/2015
2179
2163.42
5.8
10900
<3
2.4j
30.1
0.94
<14.9
<0.72
<149
<300
12
32.6
41.6
31700
4.6
1920
434
<0.0096
<3
4.9
<30
755
3.3
<298
<3
<300
<3
44.6
51.8
CB -08 SB (2-3)
04/22/2015
2139
2096.23
5.7
20100
<5.6
2.9j
87.5
0.62
23.3
<0.67
185
<289
19.4
4.5 j
5.6
23300
12
1110
99.5
0.029
<2.8
5.4
<28.9
785
<5.6
<280
3.1
<289
<5.6
36.1
27.8
CB -08 SB (21-22)
04/22/2015
2120
2096.23
5.5
27700
<5.3
<5.3
230
1.9
32.8
<0.63
<263
<260
26.3
23.5
5.1
32300
12.6
8400
569
<0.0085
<5.3
25.1
<26
7680
3.7j
<527
7.2
<260
<5.3
36
149
CB -08 SB (27-29)
04/22/2015
2113
2096.23
5.8
40100
<6.1
<6.1
356
2
50
<0.73
169
<298
48.5
32.3
178
45600
21.6
13300
1020
<0.0092
<3
37.4
<29.8
12200
3.9j
158j
1.6j
<298
<6.1
50.3
203
CB -08 SB (34-36)
04/22/2015
2106
2096.23
6.3
28300
<5.5
<5.5
232
1.5
31.5
<0.66
218
<262
34.1
22.9
9.1
36400
6.3
11700
570
<0.0083
<2.8
33.3
<26.2
10300
2.8j
<276
10.1
<262
<5.5
31.7
130
CB -09 SB (1-2)
04/12/2015
2177
2144.50
5.2
16800
<3.6
2.3 j
49.7
0.56
<17.9
<0.43
<179
<348
38.8
20.3
13.5
40300
27.5
326
599
0.06
<3.6
2
<34.8
290j
<3.6
<358
2.1 j
<348
<3.6
55.9
10.7
CB -09 SB (25-27)
04/12/2015
2152
2144.50
5.6
12900
<3.1
<3.1
75
1
<15.3
<0.37
<153
<303
45.1
23.7
25.6
40700
16.5
4430
1010
<0.01
<3.1
11.9
<30.3
4660
<3.1
<307
<3.1
<303
<3.1
65.2
54.7
GW -01 SB(1-2)
04/25/2015
2170
2159.98
7.8
21400
<6.3
3.7j
157
1.2
31.4
0.51j
8500
<311
28.7
18.6
48.5
33000
48.7
7490
486
0.12
<3.1
15.5
<31.1
4750
<6.3
<313
18.1
<311
<6.3
39.9
206
MW -03 SB (1-2)
03/25/2015
2137
2100.40
4.5
16800
<3
2.9j
93.5
0.53
25.5
<0.36
102
<295
17.2
7.7
10
27000
13.1
762
135
0.024
<0.6
3.6
<29.5
687
1.9j
<298
2.3
<295
<3
28.8
24.1
MW -03 SB (20-22)
03/25/2015
2117
2100.40
5.9
24000
<2.6
3.6
136
1.6
31.3
<0.31
214
<258
12.7
16.4
46.5
32800
10.4
7800
325
<0.0085
<2.6
9.7
<25.8
5630
6
<259
5.2
<258
<2.6
17.7
81.2
MW -03 SB (28-30)
03/25/2015
2109
2100.40
4.9
13900
<2.8
3.2
56.4
0.33
28.3
<0.33
437
<273
10.9
16
52.6
29900
5.4
6950
109
<0.0085
<2.7
15.9
<27.3
5480
5.3
<274
3.6
477
<2.8
13.5
64.8
MW -05 SB(2-3)
04/25/2015
2083
2065.03
5.2
25500
<6.4
<6.4
90.2
0.93
31.4
<0.77
581
<306
29.3
16.3
18.3
33400
10.5
3630
197
0.066
<3.2
8.8
<30.6
1870
<6.4
<319
12.8
196j
<6.4
35.6
45.8
MW -05 SB(13-14)
04/25/2015
2072
2065.03
6.0
18100
<5.5
<5.5
64.3
0.7
40.1
<0.66
335
<281
14.5
9
45.7
44500
5.8
3880
210
<0.0091
<2.7
7.5
<28.1
256j
<5.5
<274
7.8
<281
<5.5
10
36.9
MW -07 SB (1-2)
04/07/2015
2068
2048.02
5.3
18600
<7.5
<7.5
85.9
0.79
<18.7
<0.9
268
<369
25.5
10.7
11.8
18600
14.5
2210
162
0.023
0.82
9.4
<36.9
1740
<7.5
<75
2.3
<369
<7.5
39.4
37.4
MW -07 SB (10-11)
04/07/2015
2059
2048.02
6.4
13300
<7
3.6j
103
1
<17.6
<0.85
2650
<335
22.5
18.3
17
53200
25.2
6780
669
<0.011
<0.7
26.8
<33.5
1270
<7
108
19.4
<335
<7
26.7
99
MW -07 SB (16-17)
04/07/2015
2053
2048.02
7.4
8750
<6.9
<6.9
136
0.61
<17.2
<0.82
735
<330
11.4
6.5j
15.5
12700
5.1j
1680
257
<0.011
0.55j
3.7
<33
3140
<6.9
163
5.6
<330
<6.9
17.7
33.4
MW -08 SB (1.5-2)
02/27/2015
2121
2113.63
5.4
27800
<1.3
<13.5
38.7
0.76
<33.6
<0.16
186j
<331
55.1
39.4
38.1
65200
23.6
383
931
0.057
<6.7
3j
<33.1
<673
<13.5
<673
<6.7
<331
<1.3
75
15
MW -09 SB (1-2)
03/31/2015
2140
2113.99
6.4
34200
<6.7
<6.7
75.2
0.82
<16.7
<0.8
102j
<338
17.8
29.6
33
39200
12.9
3000
548
0.02
<3.3
10.2
<33.8
2740
<6.7
<335
2.4 j
<338
<6.7
48.6
55.7
MW-09SB (12-17)
04/14/2015
2125
2113.99
7.0
37000
<5.5
<5.5
351
8.9
<27.3
<0.65
768
<265
185
33.7
21.1
54600
8.7
13700
1170
<0.0088
<2.7
92.6
<26.5
7010
<5.5
<273
4.4
<265
<5.5
171
98.1
MW-09SB (19-20)
04/14/2015
2122
2113.99
6.3
27300
<5.6
<5.6
288
7.5
<14.1
<0.68
1450
<280
98.7
27
17.6
37400
7.7
10800
950
<0.009
<2.8
56.9
<28
5380
<5.6
<282
6.1
<280
<5.6
104
69.3
MW-11SB (1.5-2)
02/04/2015
2030
2024.22
7.2
18100
<1
1.4 j
112
0.51
20.4 j
<0.31
975
<247
18.5
10.1
5.9
20900
7.3
5470
190
0.018
<5.2
13.6
<24.7
4470
1.6 j
<515
3.6 j
<247
<1
26
62.4
MW -12 SB (1.5-2)
03/16/2015
2157
2126.97
7.3
26200
<3.2
3.6
205
1.9
<32
<0.38
1390
246j
22.2
24
11.3
32500
12.5
7290
664
0.0079j
<6.4
19.7
<32
6990
5.1
<640
31.6
204j
<3.2
35.3
128
MW-13SB (1.5-2)
01/29/2015
2149
2123.86
6.9
12700
<1
<2.5
36.3
0.4
36.4
<0.3
664
<248
41.7
11
21.4
36200
12.7
622
215
0.041
<0.5
3.3
<24.8
372
<2.5
<501
1.8
<248
<1
45
10.7
MW-13SB (14.5-15)
01/29/2015
2136
2123.86
6.3
32700
<1
<2.5
172
0.89
36.2
<0.3
271
<248
34.2
9.4
11.6
39200
12.2
4890
226
0.016
<5.1
15.5
<24.8
4490
2.4j
<506
<5.1
<248
<1
48.7
116
M W-13SB (22-22.5)
01/29/2015
2129
2123.86
5.5
26100
<1
1.5 j
209
1.8
27.3
<0.31
<255
<251
24.6
16.1
1.9 j
28900
11.9
7520
336
0.005 j
<5.1
21.1
<25.1
7650
4.3
<510
3.2 j
<251
0.52 j
39.3
192
MW-14SB (1.5-2)
02/03/2015
2075
2059.63
6.4
21000
<1
2.2j
113
0.72
31.1
<0.3
167j
<248
36.1
31.8
66.2
32200
12.1
4840
616
0.011
<5
16.4
<24.8
3790
2.9
<503
<5
<248
<1
41.5
85.6
MW -22 (1-2)
06/23/2015
2047
2039.43
5.7
15100
<5.9
3j
112
0.92
<14.7
<0.71
330
<297
17.7
9.7
9.4
17600
11.8
1740
716
0.035
<2.9
9.6
<29.7
1330
<5.9
<294
3.4
<297
<5.9
25.6
33.3
MW-23BR (2-3)
06/14/2015
2100
2073.11
4.7
13900
<6.3
<6.3
60.5
0.62
<15.7
<0.75
218
<300
17.8
4.1 j
8.3
20800
j 10 j
1720 j
70.4
0.039
<3.1
4.9
<30
1070
<6.3
<313
3.5
<300
<6.3
26.9
31
MW-24SB (1-2)
05/04/2015
2168
2162.66
6.4
21500
<7
4.6j
125
1.9
36.6
<0.84
1020
<333
48.6
40.2
33.8
35100
37.5
5430
728
0.03
<7
21.9
<33.3
3900
7
<349
6.8
<333
<7
66.4
101
Total Count of Valid Samples
30
30
0*
23
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30*
30
13
30
30
30
1
30
30
Prepared by: JHG/BDW Checked by: TDP
Notes:
0 Concentration or detection limit greater than PSRG Protection of Groundwater Standard
mg/kg = milligrams per kilogram
NE = Not established
S.U. = Standard Units
j = Estimated concentration above the adjusted method detection limit and below the adjusted reporting limit.
< = concentration not detected at or above the adjusted reporting limit.
= No detectable concentrations within data set
PSRG Protection of Groundwater = NCDEQ IHSB Preliminary Soil Remediation Soil Remediation Goals Table - October 2016
= Water table elevations collected during site -wide well gauging event on September 21, 2016.
P:\Duke Energy Progress. 1026\02.ASH EVILLE PLANT\40. 1982 Basin Closure Soil Sampling\Stats\FINAL Background Soil Data Sum_REV1.xisx Page 1 of 1

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BACKGROUND SOIL
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148 RIVER STREET, SUITE 220
SAMPLE LOCATIONS
s
GREENVILLE, SOUTH CAROLINA 29601
PHON E 864-421-9999
ASHEVILLE STEAM ELECTRIC PLANT
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DRAWN BY: A. FEIGL 7777 777
ARDEN NORTH CAROLINA
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PROJECT MANAGER: T. PLATING
I CHECKED BY: T. PLATING