TABLE 2 - Belews Creek GW BG Threshold Values

TABLE 2
GROUNDWATER BACKGROUND THRESHOLD VALUES
BELEWS CREEK STEAM STATION
DUKE ENERGY CAROLINAS, LLC, BELEWS CREEK, NC
Parameter
Reporting Unit
NCAC 02L Standard
Background Threshold Values
Shallow
Deep
Bedrockt
pH*
S.U.
6.5-8.5
5.1 - 6.03
5.19 - 7.02
6.3 - 6.5
Alkalinity
mg/L
NE
22.9
63.7
81.3
Aluminum
pg/L
NE
860
140
100
Antimony
pg/L
1°
1
1
0.5
Arsenic
pg/L
10
1
1
0.51
Barium
pg/L
700
58
12.6
6.2
Beryllium
pg/L
4°
0.362
0.219
0.2
Bicarbonate
mg/L
NE
22.3
62.9
77.6
Boron
pg/L
700
ND
ND
50
Cadmium
pg/L
2
1
1
0.08
Calcium
mg/L
NE
3.69
13.2
10.3
Carbonate
mg/L
NE
ND
ND
5
Chloride
mg/L
250
15
20.9
3
Chromium (VI)
pg/L
10
1.75
0.411
0.33
Chromium
pg/L
10
4.72
3.3
5.3
Cobalt
pg/L
1°
0.509
1.6
0.76
Copper
pg/L
1000
2.7
5
9.7
Iron
pg/L
300
750
240
228
Lead
pg/L
15
1
1
0.11
Magnesium
mg/L
NE
3.41
6.94
3.35
Manganese
pg/L
50
27.9
55
9.9
Mercury
pg/L
1
ND
ND
0.2
Methane
pg/L
NE
2.65
2.64
10
Molybdenum
pg/L
NE
1.00
1.3
3.7
Nickel
pg/L
100
4.26
4.67
3.2
Nitrate + Nitrite
mg-N/L
NE
3.63
4.19
0.17
Potassium
mg/L
NE
5
5
5.15
Selenium
pg/L
20
ND
ND
0.5
Sodium
mg/L
NE
5.92
10.7
12
Strontium
pg/L
NE
56.5
68.5
100
Sulfate
mg/L
250
1.93
6.35
9.6
Sulfide
mg/L
NE
ND
ND
0.1
TDS
mg/L
500
85
148
133
Thallium
pg/L
0.2°
0.2
0.2
0.1
TOC
mg/L
NE
ND
ND
10.2
Vanadium
pg/L
0.3°
1.89
1.45
0.82
Zinc
pg/L
1000
10
43.2
16
Radium (Total)
pCi/L
NE
8.74
1.1
0.466
Uranium (Total)
pg/mL
NE
0.0005
0.0005
0.00054
Prepared by: JHG Checked by: CDE / LWD
Notes•
Shallow background wells: BG-2S, BG-3S, MW-202S, and MW-3
Deep background wells: BG-1D, BG-2D, BG-3D, and MW-202D
Bedrock background wells: BG-2BR-A and MW-202BR
t - Indicates value is provisional; dataset contains less than 10 valid samples
TDS - Total Dissolved Solids
Radium (Total) - Radium-226 and Radium-228 combined
Uranium (Total) - Uranium-233, Uranium-234, Uranium-236, and Uranium-238 combined
S.U. - Standard Unit
pg/L - micrograms per liter
mg/L - milligrams per liter
pCi/L - picocuries per liter
pg/mL - micrograms per milliliter
* - Upper and lower tolerance limits calculated for parameter
A - Interim Maximum Allowable Concentrations (IMACs) of 15A NCAC .021- Standard, Appendix 1, April 1, 2013
ND - Not Detected
NE - Not Established
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