NC0003433_Table 6-9 Horizontal Groundwater Gradients_20150902

TABLE 6-9
HORIZONTAL GROUNDWATER GRADIENTS AND FLOW VELOCITIES
CAPE FEAR STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, MONCURE, NC
Ash Basin Groundwater Gradients
Direction
Aquifer
Data Points
Gradient
(ft per ft)
Velocity
(ft per yr)
1985 Ash Basin
NE
Surficial
ABMW-01S to CMW-5
0.0080
25*
NE
Bedrock
ABMW-01BR to MW-5BR
0.0068
0.7 - 3
S
Surficial
ABMW-01S to PZ-5
0.0084
33*
NW
Surficial
ABMW-01S to MW-17SL
0.0050
13
NW
Bedrock
ABMW-01BR to MW-17BR
0.0038
5 - 20
SE
Surficial
ABMW-01S to CMW-6
0.0043
17*
SE
Bedrock
ABMW-01BR to MW-6BR
0.0040
7 - 20
1956 Ash Basin
E
Surficial
BGMW-04 to ABMW-05S
0.0023
21*
E
Bedrock
BGTMW-04 to ABMW-05BR
0.0021
0.4 - 1*
SW
Surficial
ABMW-05S to CMW-02
0.0030
22*
SW
Bedrock
ABMW-05BR to CTMW-02
0.0042
1 - 2*
NW
Surficial
ABMW-05S to MW-10
0.0015
14*
NW
Bedrock
ABMW-05BR to MW-10BR
0.0048
1- 2
1978 Ash Basin
SE
Surficial
ABMW-02SL to CMW-07
0.0169
27*
1963 Ash Basin
W
Surficial
ABMW-04S to CMW-8
0.0239
52*
1970 Ash Basin
SW
Surficial
ABMW-03S to CMW-1
0.0240
6*
SW
Bedrock
ABMW-03BR to CTMW-1
0.0106
39 - 164*
Prepared by: RKD Checked by: CJS
Notes:
ft = feet
yr = year
*In the absence of hydraulic conductivity data for one of these wells, the hydraulic conductivity value used is the geometric mean
of other wells in the same hydrologic monitoring zone (surficial or bedrock).
Water level measurements used for these calculations were collected on June 30 and July 1, 2015
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