NC0038377_App E Well Logs Construction Diagrams_20160701

Comprehensive Site Assessment Supplement 1 July 2016
Mayo Steam Electric Plant SynTerra
APPENDIX E
WELL LOGS AND CONSTRUCTION DETAILS
(ABMW-02BRL AND MW-17BR)
P: \Duke Energy Progress.1026\ 105. Mayo Ash Basin GW Assessment Plan\ 19.EG_CSASUP\MAYO CSA Supplement 1 July
2016.docx

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PROJECT: Mayo Steam Electric Plant
WELL / BORING NO: ABMW-02BRL
PROJECT NO: 1026.105
STARTED: 1/6/16 COMPLETED: 1/13/16
DRILLING COMPANY: Cascade Drilling
NORTHING: 1012772.723 EASTING: 2030463.498
DRILLING METHOD: Rotary Sonic
G.S. ELEV: 491.06 ft M.P. ELEV: 493.97 ft
BOREHOLE DIAMETER: 4 IN
DEPTH TO WATER: 11.35 ft TOC TOTAL DEPTH: 165.0 ft BGS
NOTES:
LOGGED BY: B. Wylie CHECKED BY: K. Donovan
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WELL
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DESCRIPTION
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CONSTRUCTION
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SP
SAND, dark gray, coarse -medium grained. Some rock
fragments, 50% recovery.
5
No Recovery.
ASH, dark grey, coarse sand, same as above.
10
FLY ASH, light grey, coarse sand, rock fragments, dry.
15
FLY ASH, light grey sand, moist, dense, very coarse.
20
No Recovery. Fluid texture, running override 10.0" rod until
harder material is encountered.
x0y
25
-
30
x0y
PVC Surface Casing
No Recovery. Using water and 10.0" override to get
through fluid material.
35—
x0y
CL
CLAY, brown, wet, dense grey mottling. Some minor
structure. verydense.
CL
CLAY, reddish -brown with grey mottling, loose, saprolitic.
CL
CLAY, light brown to grey, dense, sandy, no structure.
CLIENT: Duke Energy Progress, LLC.
SynTerra
148 River Street, Suite 220 PROJECT LOCATION: Roxboro, NC
Greenville, South Carolina 29601
s)mTerra Phone: [phone] PAGE 1 OF 5

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PROJECT: Mayo Steam Electric Plant
WELL / BORING NO: ABMW-02BRL
PROJECT NO: 1026.105
STARTED: 1/6/16 COMPLETED: 1/13/16
DRILLING COMPANY: Cascade Drilling
NORTHING: 1012772.723 EASTING: 2030463.498
DRILLING METHOD: Rotary Sonic
G.S. ELEV: 491.06 ft M.P. ELEV: 493.97 ft
BOREHOLE DIAMETER: 4 IN
DEPTH TO WATER: 11.35 ft TOC TOTAL DEPTH: 165.0 ft BGS
NOTES:
LOGGED BY: B. Wylie CHECKED BY: K. Donovan
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DESCRIPTION
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WELL
CONSTRUCTION
CL
CLAY, red with grey mottling, sandy, non -plastic. Contains
highly weathered gneissic saprolite.
CL
CLAY, reddish -brown, very dense, no relic structure.
SAPROLITE, light brown, high clay content, gneissic
45
texture, large grey mottling.
SCHIST SAPROLITE, dark red with minor dark brown,
some structure.
NN
QUARTZITE, gravel size fragments with red clay.
50
SAPROLITE, dark red to black, grey mottling, dense.
55
SCHIST SAPROLITE, light brown, good structure.
SCHIST SAPROLITE, less weathered, less clay content,
dense, rock fragments, easliy broken with heavy staining,
60
good structure. Manganese staining on larger rock'\0Cement
Grout
fragments. Partially weathered rock contact at 62.0' bgs.
65
RK
Partially Weathered Rock, light brown saprolite, same as
above.
70
SAPROLITIC SCHIST, light brown, grey, red, high clay
content, good structure.
5
75
RK
Partially Weathered Rock, rock fragments, weathered
staining, granitic/gneissic texture. Some saprolite,
transitioning into harder, fresh granitic rock.
CLIENT: Duke Energy Progress, LLC.
ra
48 Rver Street, Suite 220 PROJECT LOCATION: Roxboro, NC
148 River
Greenville, South Carolina 29601
s)mTerra Phone: [phone] PAGE 2 OF 5

PROJECT: Mayo Steam Electric Plant
WELL / BORING NO: ABMW-02BRL
PROJECT NO: 1026.105
STARTED: 1/6/16 COMPLETED: 1/13/16
DRILLING COMPANY: Cascade Drilling
NORTHING: 1012772.723 EASTING: 2030463.498
DRILLING METHOD: Rotary Sonic
G.S. ELEV: 491.06 ft M.P. ELEV: 493.97 ft
BOREHOLE DIAMETER: 4 IN
DEPTH TO WATER: 11.35 ft TOC TOTAL DEPTH: 165.0 ft BGS
NOTES:
LOGGED BY: B. Wylie CHECKED BY: K. Donovan
W
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DESCRIPTION
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WELL
CONSTRUCTION
GRANITIC GNEISS, some weathering, hard, staining and
- _
mineralization along fracture planes. Some fresh surfaces
as well.
5
Bedrock starting at 78.0'-79.0' bgs, medium grained
granitic gneiss.
-
Vertical to sub -vertical fractures at 80.0', 84.0', and 86.0'
bgs.
Quartize vein at 83.0' bgs.
Staining more prevalent at 82.0'-87.0' b s.
;-
_
GRANITIC GNEISS, dark grey, mafic, some red
-"
staining/mineralization faces, finer grained than above.
-
GRANITIC GNEISS, hard, little to no weathering, some
mineralized fractures.
90
GRANITIC GNEISS, with vertical fracture between
91.0'-91.5' bgs. Dark red mineralization. Secondary vertic
fracture at 91.5-92.0' with dark green mineraliztion, hard,
massive.
_
GRANITIC GNEISS, with breaks along foliation. Fresh red
staining and dark red mineralization.
95
; '
`
GRANITIC GNEISS, red mineralization along foliation
breaks. White mineralization on one fracture surface.
Fractures throughout with dark mineralization.
100
QUARTIZE vein.
GRANITIC GNEISS, with horneblende, less feldspar.
Large fracture at 101.0' bgs with dark green mineralization.
105
- -
Dark red staining mineralizated surfaces. Large vertical
fracture at 107.0' bgs with dark green/black mineralization.
PHYLLITE, foliated metamorphic, fine-grained. Black
horneblende banding, massive. Large vertical fracture at
110
109.0' bgs, no apparent weathering. Small fresh fracture at
110.0' bgs with same chlorite mineralization.
GRANITIC GNEISS, fine -medium grained, same as
above.
115
-
GRANITIC GNEISS, fine to medium grained, dark red
staining on fracture joints. Same as above.
CLIENT: Duke Energy Progress, LLC.
ra
48 Rver Street, Suite 220 PROJECT LOCATION: Roxboro, NC
148 River
Greenville, South C lina 29601
s mTerra Phone: [phone] PAGE 3 OF 5

PROJECT: Mayo Steam Electric Plant
WELL / BORING NO: ABMW-02BRL
PROJECT NO: 1026.105
STARTED: 1/6/16 COMPLETED: 1/13/16
DRILLING COMPANY: Cascade Drilling
NORTHING: 1012772.723 EASTING: 2030463.498
DRILLING METHOD: Rotary Sonic
G.S. ELEV: 491.06 ft M.P. ELEV: 493.97 ft
BOREHOLE DIAMETER: 4 IN
DEPTH TO WATER: 11.35 ft TOC TOTAL DEPTH: 165.0 ft BGS
NOTES:
LOGGED BY: B. Wylie CHECKED BY: K. Donovan
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WELL
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DESCRIPTION
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CONSTRUCTION
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GRANITIC GNEISS, quartize veins. Dark red
staining/mineralization on fractured surfaces. Some
-
cobbles. Minor pyrite mineralization on some surfaces.
_-
40% recovery.
125
-
130
--��'
-
GRANITIC GNEISS, hard, no visible fractures. Some dark
red staining.
-->
—Cement Grout
135
-
140
_'I �
-
GRANITIC GNEISS, hard, same as above.
-
Phyllite zone between 145.0'-146.0' bgs. Some red
-
staining on gneiss surfaces, possible sub -vertical fractures
throughout.
145
-
Benton ite
PHYLLITE, black, chlorite mineralization.
150 JI
-Sand Pack
_
GRANITIC GNEISS, red mineralization/staining in this
zone. Large vertical fracture with heavy staining at
-'
approximately 154.0' bgs.
155
CLIENT: Duke Energy Progress, LLC.
ra
48 Rver Street, Suite 220 PROJECT LOCATION: Roxboro, NC
148 River
Greenville, South Carolina 29601
s)mTerra Phone: [phone] PAGE 4 OF 5

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PROJECT: Mayo Steam Electric Plant
WELL / BORING NO: ABMW-02BRL
PROJECT NO: 1026.105
STARTED: 1/6/16 COMPLETED: 1/13/16
DRILLING COMPANY: Cascade Drilling
NORTHING: 1012772.723 EASTING: 2030463.498
DRILLING METHOD: Rotary Sonic
G.S. ELEV: 491.06 ft M.P. ELEV: 493.97 ft
BOREHOLE DIAMETER: 4 IN
DEPTH TO WATER: 11.35 ft TOC TOTAL DEPTH: 165.0 ft BGS
NOTES:
LOGGED BY: B. Wylie CHECKED BY: K. Donovan
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WELL
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DESCRIPTION
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CONSTRUCTION
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GRANITIC GNEISS, non -foliated, large vertical fracture
from 157.5'-160.0' bgs with heavy red staining. Smaller
fracture with staining/mineralization at 164.0' bgs.
_-
164.5'-167.0' bgs, GRANITE, hard. Fresh break without
165
- -
staining at 165.0' bgs.
Sand Pack
170
-
GRANITIC GNEISS, same as above. Vertical fracture at
_-
168.0'-169.0' bgs. Some epidote, light green mineralization
-
along foliation planes. Small fractures at 173.0' bgs and
176.0' bgs. Some red -brown staining on fracture at
168.0'-169.0' bgs.
175
-
GRANITIC GNEISS, no apparent fractures.
180
185
Boring terminated at 180.0' below ground surface.
190
195
CLIENT: Duke Energy Progress, LLC.
SynTerra
148 River Street, Suite 220 PROJECT LOCATION: Roxboro, NC
Greenville, South Caroling 29601
s)mTerra Phone: [phone] PAGE 5 OF 5

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PROJECT: Mayo Steam Electric Plant
WELL / BORING NO: MW-17BR
PROJECT NO: 1026.105
STARTED: 1/6/16 COMPLETED: 1/11/16
DRILLING COMPANY: Cascade Drilling
NORTHING: 1013955.131 EASTING: 2033767.506
DRILLING METHOD: Rotary Sonic
G.S. ELEV: 487.51 ft M.P. ELEV: 490.55 ft
BOREHOLE DIAMETER: 4 IN
DEPTH TO WATER: ft TOC TOTAL DEPTH: 120.0 ft BGS
NOTES:
LOGGED BY: A. Lefitz CHECKED BY: K. Donovan
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WELL
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DESCRIPTION
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CONSTRUCTION
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Silty SAND, tan, very loose to loose, dry, moderately
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fine-grained.
Partially Weathered Rock, very dense to dense, highly
5
RK
laminated, dry micaeous, transitional zone, rock mixed
highly weathered rock.
Partially Weathered Rock, same as above. Increase of
RK
rock fragments. Rock, highly weathered, salt and pepper
color, medium sized grains, dark brown to light gray.
10
Significant staining, dry.
RK
Partially Weathered Rock, same as above.
15
RK
Partially Weathered Rock, same as above, dry, significant
staining.
20
Partially Weathered Rock, same as above, highly
RK
weathered, surrounded by rock flour grading (approx. 22.5'
bgs). dense to very dense, highly laminated, dark brown,
fine-grained silt, dry to moist.
25
Partially Weathered Rock, same as above from 25.0'-28.5'
RK
bgs. Grading into moderately hard, moderately to highly
weathered, abundant staining, large to fine frained granitic
gneiss with sheets of mica on fracture plane.
30
Partially Weathered Rock, same as above. Multiple high
angle to vertical fractures. 38.0'-40.0' bgs large pieces of
competent rock staining on fracture faces (high angle to
35
RK
vertical) breaks along mica layer. Sharp contacts between
weathered mica (approx. 0.25" in thickness), hard, larfe to
fine-grained, monderately to highly weathered granitic
gneiss. Top of rock at approximately 38.5' bgs.
CLIENT: Duke Energy Progress, LLC.
SynTerra
148 River Street, Suite 220 PROJECT LOCATION: Roxboro, NC
Greenville, South Carolina 29601
s)mTerra Phone: [phone] PAGE 1 OF 4

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PROJECT: Mayo Steam Electric Plant
WELL / BORING NO: MW-17BR
PROJECT NO: 1026.105
STARTED: 1/6/16 COMPLETED: 1/11/16
DRILLING COMPANY: Cascade Drilling
NORTHING: 1013955.131 EASTING: 2033767.506
DRILLING METHOD: Rotary Sonic
G.S. ELEV: 487.51 ft M.P. ELEV: 490.55 ft
BOREHOLE DIAMETER: 4 IN
DEPTH TO WATER: ft TOC TOTAL DEPTH: 120.0 ft BGS
NOTES:
LOGGED BY: A. Lefitz CHECKED BY: K. Donovan
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WELL
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DESCRIPTION
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CONSTRUCTION
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SAPROLITE, hard, moderately weathered to fresh,
45
medium to fine-grained, gray schist, cobble sized pieces of
rock, surrounded by saprolite with phyllitic relic structure.
40% recovery.
50
—Cement Grout
SAPROLITE, same as above.
55
SCHIST, staining on fracture faces, grading into phyllitic
partially weathered rock. Saprolite apparent between
59.5'-60.0' bgs, moist.
60
SAPROLITE, phyllitic relic structure present, wet. Sharp
contact at 62.0' bgs, dry sandy silt, grading into hard,
biotite, gneiss.
65
-
BIOTITE GNEISS, hard, very fine-grained, slight
weathering to fresh.
-
BIOTITE GNEISS, same as above. Contact with quartz
_-
veins below. Mylonite, hard, very fine-grained, tan and
75
- -
gray, biotite gneiss. Secondary pyrite mineralization
present throughout, large pieces surrounded by cobble to
gravel size pieces.
CLIENT: Duke Energy Progress, LLC.
SynTerra
148 River Street, Suite 220 PROJECT LOCATION: Roxboro, NC
Greenville, South Carolina 29601
s)mTerra Phone: [phone] PAGE 2 OF 4

PROJECT: Mayo Steam Electric Plant
WELL / BORING NO: MW-17BR
PROJECT NO: 1026.105
STARTED: 1/6/16 COMPLETED: 1/11/16
DRILLING COMPANY: Cascade Drilling
NORTHING: 1013955.131 EASTING: 2033767.506
DRILLING METHOD: Rotary Sonic
G.S. ELEV: 487.51 ft M.P. ELEV: 490.55 ft
BOREHOLE DIAMETER: 4 IN
DEPTH TO WATER: ft TOC TOTAL DEPTH: 120.0 ft BGS
NOTES:
LOGGED BY: A. Lefitz CHECKED BY: K. Donovan
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DESCRIPTION
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WELL
CONSTRUCTION
_-
BIOTITE GNEISS, same as above, abundant k-feldspar,
85
- -
"
some iron magnesium staining, secondary mineralization
of calcite on fracture planes.
90
95
-
BIOTITE GNEISS, same as above.
100
- "
BIOTITE GNEISS, same as above.
APHANTITIC PHYLLITE, green to black, hard to very
hard. Veins of quartize apparent at 102.0'-102.15' b s
Bentonite
MYLONITE, same as above.
PHYLLITE, same as above. Surrounded by poorly sorted,
massive, silty sand, gray. Most pieces of core are cobble
105
sized, large, high angle fracture at 108.0' bgs. Chlorite on
fracture face, abundant pyrite, wet to 109.0' bgs.
MYLONITE, same as above.
110
Sand Pack
Well Screen
115
MYLONITE, same as above. Silty sand present, massive,
conhesive, wet until 119.5' bgs.
SynTerra CLIENT: Duke Energy Progress, LLC.
148 River Street, Suite 220 PROJECT LOCATION: Roxboro, NC
Greenville, South Caroling 29601
s)mTerra Phone: [phone] PAGE 3 OF 4

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PROJECT: Mayo Steam Electric Plant
WELL / BORING NO: MW-17BR
PROJECT NO: 1026.105
STARTED: 1/6/16 COMPLETED: 1/11/16
DRILLING COMPANY: Cascade Drilling
NORTHING: 1013955.131 EASTING: 2033767.506
DRILLING METHOD: Rotary Sonic
G.S. ELEV: 487.51 ft M.P. ELEV: 490.55 ft
BOREHOLE DIAMETER: 4 IN
DEPTH TO WATER: ft TOC TOTAL DEPTH: 120.0 ft BGS
NOTES:
LOGGED BY: A. Lefitz CHECKED BY: K. Donovan
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WELL
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DESCRIPTION
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CONSTRUCTION
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Boring terminated at 120.0' below ground surface.
125
130
135
140
145
150
155
CLIENT: Duke Energy Progress, LLC.
SynTerra
148 River Street, Suite 220 PROJECT LOCATION: Roxboro, NC
Greenville, South Caroling 29601
s)mTerra Phone: [phone] PAGE 4 OF 4