NC0003433_Table 6-7 Input Parameters and Values for CD Flow Equation NEW_20160229

TABLE 6-7
INPUT PARAMETERS AND VALUES FOR CONVECTIVE -DISPERSIVE
FLOW EQUATION BASED UPON CAPE FEAR DATA
CAPE FEAR STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, MONCURE, NC
Value
1956, 1963,
1985° Ash
Parameter
Nomenclature
Source of Value
1970 Ash
Basin
Basins
Began Sluicing Ash
-
1956
1985
CSA
Ceased Sluicing
-
1977
2012
CSA
Duration of Source Term
t°
22
28
Calculated
Mean values from Ash
Source Concentration
c °
3,783 boron,
3,330 boron
Pore Wells
(pg/L)
5.77 thallium
(Exceedances Only)
2015
Lowest Provisional
Background
Background
Concentration
c;
52 boron,
Concentrations or
(pg/L)
0.1 thallium
Detection Limits for
Not Detected Values
Seepage Velocity (ft/yr)
vs=ki/ne
16
Calculated average
across the site
Dispersivity (ft)
a
20
0.1*2000
Dispersion (ft2/yr)
D = ays
320
Calculated
Distribution Coefficient
Kd
0.5v- boron, 26 thallium
Graziano et a/.,2015
(ml/g)
Time from Introduction
t
Varies
To capture the length
of Constituent (years)
of plume
Distance from Boundary
x
250
1000/600*
Measured (ash basin
of Ash Basin (feet)
to body of water)
Calculated Concentration
c(x,t)
As shown pg/L
Calculated.
Prepared by: KDB Checked by: DGN
Notes:
'Three models were considered for the 1985 ash basin: groundwater moving radially toward three discharge
locations: Branch A, Shaddox Creek, and Cooling Water Effluent Channel.
*250 (toward Cape Fear River), 1000 (toward Shaddox Creek and Cooling Water Effluent Channel), 600 (Branch A)
Graziano et al., 2015 used 1.0 for boron. In order to more accurately demonstrate the movement of Boron and align
with field data, the value for Kd was changed to 0.5.
The 1978 ash basin was not considered for this model due to insufficient input values.
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