NC0004774_Duke Drilling Report_20180113

McCXL
BROTHERSPOST OFFICE BOX 668710 o CHARLOTTE, NC 28266-8710 o TELEPHONE [phone] TELEFAX [phone]
INC.
SUMMARY OF DRiLILA ACTIVITIES
Founded1938
AND H DROGEOLOGIcC REPORT
Ig
TEST WELL FOR ASH BENEFICIATION PROJECT
DUKE ENERGY o BUCK STEAM PLANT
The overall scope of this report is to describe the drilling activities and well construction that
took place at the Buck Steam Station. This well was intended to be a test well that potentially
could be approved for use as a water supply for the ash beneficiation project. It is important -to
note that Justin Winter (a degreed geologist) was onsite and collected data under my supervision
to record changes within the bedrock, as well as overall safe groundwater practices. Justin
graduated with a BS in Geology from Western Carolina University. He has worked under my
supervision in various capacities since his employment here as I mentor him in practical field
assessment and data collection procedures. His field methods are sound, and similar to my own.
It should be noted that the rock types identified are general presumptions, based on observation
only and field identification of basic mineral content and metamorphic rank. A drilling log with
formation descriptions is attached to this document as described by Justin Winter and reviewed
by the undersigned, along with the NC Well Construction Record (Form GW -1).
January 8th, 2018
McCall Brothers Inc. arrived on site at 8:45 AM for their safety briefing conducted by Dale
Wooten (Duke Energy). Dale instructed the crew on proper safety protocol noting specific site
locations in the event of a plant emergency. At the drill site, (bus turn around) a discussion on
various potential hazards and the general scope of work was held. Reviewing a JSA, written by
Justin Winter, this meeting was brief and concise. Work began by prepping and servicing all
equipment before drilling was to be initiated. Originally, the site access was limited, however a
service road was created to allow equipment to be brought in. This access road was created in an
effort to minimize the environmental footprint of the project on the site. The planned drilling
activities require heavy machinery with hydraulic operating systems, thus each piece of the
equipment was placed over of a bermed tarp designed to contain any possible fluids in the event
of a blowout. The surrounding work site was roped off with caution tape to raise awareness to
the hazards of construction that would be conducted. Appropriate erosion control measures were
implemented by installing two rows of silt fencing, along with a retention pit. The retention pit
was installed to capture and contain the majority of rock cuttings produced by the rig. After
these measures were taken, the drill crew were able to set up the derrick and drill the first 25'
using the stabilizer bit. This bit is designed to drill through the overburden and into shallow or
low-grade bedrock.
Janu2rry 9th, 2018
The drill crew arrived on site at the bus turn around at 8:35 AM. A safety meeting was held prior

to drilling to discuss all potential dangers associated with drilling activities, such as slips, trips,
falls, pinch points, overhead objects, and other safety hazards. The JSA was completed and was
to be signed off by Dale Wooten later on that afternoon. All equipment was inspected for leaks
or damaged hydraulic lines from the previous day. Continuing from the previous afternoon the
drill rig encountered bedrock at approximately 124'. To ensure that the bedrock was competent
air rotary drilling as described continued for an additional 6 vertical feet. After tripping all
drilling rods and tools back out of the hole McCall Brothers personnel switched drilling tools
from the stabilizer bit to a QL6 style air hammer equipped with a 61/2" diameter percussion style
rock bit. The next step of well construction involved the installation of casing. Casing is utilized
in well construction to prevent surface contaminants from entering the aquifer and to support the
overburden such that it cannot collapse into the borehole. Attached to the bottom of the casing is
a case-hardened steel drive shoe. Drive shoes are threaded to the bottom portion of casing to
protect the integrity of the pipe, and to serve as a seal when forcefully driven into bedrock.
McCall Brothers installed 134' of 8" galvanized steel casing, 6' of which was sealed into
bedrock. Re-entering the bore hole with the 61/2' bit, the drill crew were able to reach a depth of
275'below ground surface (bgs) encountering minimal fractures at 231'bgs. This fracture
resulted in a yield of 1-3 gallons per minute (gpm).
January 10'h, 2018
Arriving on site at 9:20 AM, McCall Brothers crew routinely discussed the JSA and completed
an on-site safety meeting followed by an equipment inspection. Drilling began at 9:50 AM, the
300' depth mark was reached at 10:23 AM. Typically, this drill rig will cut 25' of rock every 25-
35 minutes, depending on the grade of rock and the drill operator. At a depth of 600' bgs this
well produced an estimated total yield of 15 gpm at depth intervals of 281' bgs and 475' bgs.
Yield is determined using the air lift method. This practice involves shutting off the water
injection pump on the drill rig and allowing the compressor to "blow the well", which is
essentially fully evacuating all produced water from the well by high pressure air injection. The
water produced from this approach represents the maximum yield of the well. Yield is calculated
using a simple timed bucket test (catching the water stream from the well in a 5 gallon bucket
and counting the time required to fill it).
Januar filth, 2018
McCall Brothers Inc. arrived on site at 9:30 AM for the morning safety briefing, equipment
inspection and JSA breakdown. That afternoon Dale Wooten arrived to check up on our progress
as well as sign off on inspection sheets, along with the JSA. Starting at 600' bgs we continued to
drill to 800' bgs noting one fracture at 625'bgs, increasing the yield to 30-35 gpm. It should be
noted that dry fractures (non -water bearing joints or openings) were later encountered at deeper
depth, resulting in a decrease in the overall yield. McCall Brothers drill crew stopped drilling at
800' bgs to wait for further instruction from Duke Energy. Zabin Mansoor instructed the crew to
continue drilling up to 900' bgs. The additional 100' of drilling was accomplished the following
morning, January 12th, 2018. Due to the unexpected low yield of only 15 gpm, the well was not
reamed to 8" diameter, however it was not abandoned as it could potentially be used for a
groundwater monitoring well. Upon demobilizing from the site, a locking well cap was placed
over top of the well to ensure security will be maintained.

Conclusions
It is the opinion of the undersigned that this well is somewhat of a geological anomaly and not
representative of what would normally be expected from a yield perspective. Due to the nature
of bed rock aquifers, the pattern of water bearing fractures is both irregular and unpredictable,
therefore well yields are not guaranteed. Previous wells within the nearby area (and on the Buck
Station site) have resulted in yields greater than 150 gpm. The available surface geologic data
suggest highly fractured bedrock in the near surface which should continue at depth. It is not
unreasonable to expect a much higher yield in well drilled in this formation, than were
encountered in this particular well. It would be the recommendation of the undersigned that an
alternate location be selected at some distance away from this present drill site in a direction that
places it further toward the river. A location nearer the slope break or even at lower elevation
should result in a more productive well.
4�� 1
By:�
I Michael Floyd, L.G.
NC Licensed Geologist o. 15
McCall Brothers, Inc..