TABLE 2 GW BTVs_20171006

TABLE 2
BACKGROUND GROUNDWATER THRESHOLD VALUES
DAN RIVER STEAM STATION
DUKE ENERGY CAROLINAS, LLC, EDEN, NC
Parameter
Reporting Unit
NCAC 02L Standard
Background Threshold Values
Shallowt
Deep
Bedrockt
pH*
S.U.
6.5-8.5
5.1-6.4
5.7-7.5
7.4-8.0
Alkalinity
mg/L
NE
81
220
236
Aluminum
pg/L
NE
720
220
100
Antimony
pg/L
I
0.5
0.5
1.2
Arsenic
pg/L
10
0.5
1
1.1
Barium
pg/L
700
22
80
136
Beryllium
pg/L
4A
0.2
0.2
1
Bicarbonate
mg/L
NE
81
182
233
Boron
pg/L
700
50
50
50
Cadmium
pg/L
2
0.08
0.08
1
Calcium
mg/L
NE
21
59
59.1
Carbonate
mg/L
NE
5
5
10
Chloride
mg/L
250
7.3
7.1
4.9
Chromium (VI) 1
pg/L
10
0.6
4
5
Chromium
pg/L
10
3
4
0.3
Cobalt
pg/L
1A
1
1
1
Copper
pg/L
1000
2
3.2
11.7
Iron
pg/L
300
1100
337
1400
Lead
pg/L
15
2
0.3
1.4
Magnesium
mg/L
NE
14
20.5
20.7
Manganese
pg/L
50
16
190
32
Mercury
pg/L
1
0.2
0.2
0.2
Methane
pg/L
NE
10
10
188
Molybdenum
pg/L
NE
0.5
1.6
2.5
Nickel
pg/L
100
2
2
5
Nitrate + Nitrite
mg-N/L
NE
0.5
0.4
0.02
Potassium
mg/L
NE
5
5
5
Selenium
pg/L
20
0.5
0.5
5
Sodium
mg/L
NE
18.6
17.8
16
Strontium
pg/L
NE
240
386
1990
Sulfate
mg/L
250
41
44
12
Sulfide
mg/L
NE
0.1
0.1
0.18
TDS
mg/L
500
204
301
0.6
Thallium
pg/L
0.2A
0.1
0.1
284
TOC
mg/L
NE
1
1t
1
Vanadium
pg/L
0.3A
0.8
1.2t
1.38
Zinc
pg/L
1000
22
10
89
Radium (Total)
pCi/L
NE
0.38
2.36t
1.3
Uranium (Total)
pg/mL
NE
0.005
0.00128t
0.005
Prepared by: JHG Checked by: THE
Notes:.
* - Upper and lower tolerance limits calculated for parameter
A - Interim Maximum Allowable Concentrations (IMACs) of 15A NCAC .02L Standard, Appendix 1, April 1, 2013
pg/L - micrograms per liter
pg/mL - micrograms per milliliter
t - Provisional; dataset contains less than 10 valid samples
1 - Hexavalent chromium does not have a NC 2L/IMAC standard; therefore, the NC 2L standard for total chromium is relied upon as a surrogate.
mg - N/L - Milligrams nitrogen per liter
mg/L - milligrams per liter
NE - Not Established
pCi/L - picocuries per liter
Radium (Total) - Radium-226 and Radium-228 combined
S.U. - Standard Unit
TDS - Total Dissolved Solids
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