NC0001422_TABLE 6-6 Local Groundwater Gradients_20150805

TABLE 6-6
LOCAL GROUNDWATER GRADIENTS AND
FLOW VELOCITIES
L. V. SUTTON ENERGY COMPLEX
DUKE ENERGY PROGRESS, INC., WILMINGTON, NC
Area
Bearing
Data Points
Gradient
Velocity *(foot
per foot)
(feet per year)
West of Old
ABMW-01S to COOLING
Ash Basin
E-W
POND
0.001
0.211 to 0.384
Area
NE of Old
Ash Basin
SW -NE
ABMW-01S to AW-02B
0.00009
0.185 to 0.462
Area
East of Old
Ash Basin
W-E
ABMW-01S to AW-04B
0.0002
0.724 to 1.809
Area
SE of Old
Ash Basin
NW -SE
ABMW-01S to AW-09B
0.0007
3.42 to 8.55
Area
Prepared by: JHG Checked by: MCM, KLS
Velocity is based on the Seepage Velocity Equation where velocity equals (K x i) / n
Hydraulic Conductivity (K)
Hydraulic Gradient (i)
Porosity (n) 20 to 50 percent
Notes:
1, The hydraulic conductivity, K, is calculated from the geometric mean slug tests, See Table 6-7.
2, Soil type based on field lithologic description of soil borings,
3. Porosity is assumed based on Table 3.4 Porosity Ranges for Sediments from Fetter (2001). Applied
hydrogeology (Vol. 3, No, 3). Upper Saddle River: Prentice hall.
P: \ Duke Energy Progress.1026\ 108. Sutton Ash Basin GW Assessment Plan\ 1.11 CSA Reporting \ Tables \ Report Tables\ TABLE 6-6
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