20150994 Ver 1_IR_Report_WC-19_20160309

INADVERTENT RETURN REPORT March 7, 2016
Feature: Wetland WC -19
Inadvertent Return Report
PSNC T -001A Pipeline Project
Henderson County, North Carolina
Name and company of person reporting Inadvertent Return: Thomas Perez
(S&ME, Inc. — Environmental Inspector) — Third Party Contractor for PSNC. Cell phone
number is [phone].
Responsible party: Public Service Company of NC
Project Engineer — Craig Bodie
Telephone [phone].
Contractor performing HDD: Lone Star Directional Drilling
Date and time of Inadvertent Return: Monday, March 7, 2016 at 3:45 pm.
How was Inadvertent Return detected: Mike Johnson (Inspector with Meridian
Inspection Company) noticed drilling mud on the surface at the eastern edge of the
wetland.
Location of the Inadvertent Return: Wetland WC -19 at approximately Station
837+00. See attached map.
Type of material: Bentonite clay and water slurry — standard HDD drilling mud.
Description of Inadvertent Return and efforts to protect sensitive areas:
The drilling operation was stopped immediately upon noticing the drilling mud in the
wetland. The source of the drilling mud release was an inadvertent return to the surface of
the wetland from the pilot hole being drilled approximately 20' below. Tom Perez
(S&ME Environmental Inspector) was contacted immediately, and secondary
containment measures, silt fence (Photographs 1 & 2), was already installed around the
affected area upon my arrival. A vacuum truck was brought in to vacuum the drilling
mud out of the wetland using a hose and squeegees (Photographs 3 & 4). Joey Lawler
(S&ME Project Manager) reported incident to Andrew Moore of the U.S. Army Corps of
Engineers and North Carolina Department of Water Resources on March 8, 2016.
Estimated size of Inadvertent Return (quantity and area): A fine layer of
drilling mud impacted the wetland in an area approximately 15' x 30' x 3" deep (less than
500 gallons). Silt fence was installed to contain the entire affected area to keep it from
impacting the remainder of the wetland. Due to the quick action of the contractor and
environmental inspector, the drilling mud was contained to the relatively small initial
area.

Proposed additional HDD activities: The designed length of the HDD is
approximately 1,300 feet and the initial pilot hole is complete. The inadvertent return
occurred just prior to the pilot hole completion. There will be 2 to 3 reams required to
increase the size of the drilled hole to approximately 30" before pipe pull back, and it will
be approximately 2 to 3 weeks before the entire HDD is complete.
Proposed final cleanup method: During the remainder of the HDD, Lone Star
Directional Drilling will continue to monitor the wetland and additional drilling mud, if
identified, will be vacuumed up and returned to the drilling pit. Upon completion of
HDD activities, Lone Star Directional Drilling will remove drilling mud remaining within
the containment area. The mud may require removal by hand or vacuum truck. Upon
completion of clean-up activities, silt fence sections and other containment materials will
also be removed.
Party responsible for cleanup: Lone Star Directional Drilling.
General comments: It appears that the drilling mud has been contained within the silt
fence containment area and the entire volume of mud has been vacuumed and returned to
the drilling pit at the drill rig. The contractor stopped drilling operations, acted in good
faith to contain the drilling mud, and immediately notified environmental monitors. The
contractor and inspectors should remain alert for rain events and should take actions
necessary to contain drill mud in impacted area. Efforts to clean up the impacted area
should start as soon as practical following bore completion.
Attachment: Inadvertent Return Report Site Photographs 1-4.
Inadvertent Return Location Map.

Photo 1: View of inadvertent return location. Drilling mud is
coming up through the ground on the eastern edge of Wetland
WC -19. Silt fence was installed around the inadvertent return
to capture the mud, and the mud was vacuumed up in order to
recycle the mud back into the operation.
Photo 2: Closer view of the inadvertent return location.
Photo 3: Drilling mud being vacuumed up into a pump truck to
be returned to the drilling pit for recycling.
Photo 4: View of containment area after drilling mud was
vacuumed up.
INAVERTENT RETURN REPORT
SITE PHOTOGRAPHS (3-7-16)
PSNC T -001A Pipeline Project — Wetland WC -19
Henderson Countv, North Carolina
Photo Page 1 of 1

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