NCG170400_Spill Report_20190605

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CI
June 1, 2019
NCDEQ Division of Energy Mineral and Land Resources
Asheville Regional Office
2090 US Hwy 70
Swannanoa, NC 28778
Re: Oil Spill on May 29, 2019
Mr. Reed,
On the morning of Wednesday, May 29, 2019, SEIREN North America experienced a spill of
approximately 500 gallons of heat transfer oil at the facility located at 1500 East Union Street,
Morganton NC. The spill happened in conjunction with a fire that occurred in the boiler room
located near the western side of the main building. A timeline of events can be found in
Appendix A of this report.
Due to heat from the fire, multiple sprinkler heads were fused open, mixing fire protection
water with heat transfer oil that had escaped from the hot oil system. Prior to the fire being
completely extinguished, the mixture of heat transfer oil and fire protection water exceeded
the capacity of the boiler room containment structure, and began to overflow onto the
surrounding impervious surface and into several nearby stormwater drains. A copy of the
property stormwater flow diagram is located in Appendix B of this report.
All of the oily water mixture was contained on Seiren property, and no contamination reached
the receiving stream adjacent to the property. Further containment measures were
implemented immediately, and remediation is in process. Further details regarding the
ongoing remediation are outlined in Appendix C of this report.
If you require any further action on the part of Seiren North America, please do not hesitate to
contact me at [phone] ext. 1047 or at [phone].
Thank you,
Kevin Heape
Maintenance & Environmental Manager
SEZREN North America, LLC
Received
JUN 5 2019
Land Quality Section
Asheville

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Appendix A: Timeline of Events — May 29, 2019
9:52 AM Fire starts in Boiler Room
10:00 AM Fire Department arrives
10:08 AM Oily water is observed exiting Boiler Room
10:15 AM Containment is placed around storm drains around perimeter of Boiler Room
10:40 AM Boiler Room sprinkler system is deactivated
11:00 AM STAT, Inc. is contacted to request emergency clean-up
11:30 AM Seiren Maintenance confirms no oil has exited the property or gotten into the
adjacent creek
1:00 PM STAT arrives on site, assesses situation, and develops remediation plan
2:00 PM Vacuuming of oily water from impervious surfaces begins
5:00 PM -Underflow dam is constructed in drainage ditch on NW corner of property.
-Work begins to increase height of earthen dam leaving the holding pond in the
SE corner of the property until underflow dam can be constructed on morning of
May 30, 2019.
-Clean-up of oil -stained dirt and gravel surfaces begins.
ideceiivea
JUN 5 2019
Land QU_,lity Section
Asheville

Appendix B: Stormwater Flow Diagram
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JUN 5 2019
Land C,t;=:.i;.y Section
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The receiving stream, Hunting Creek, was frequently monitored to ensure no contamination
had migrated off of the Seiren property (Fig. 3).
Figure 3: Receiving stream, Hunting Creek, showing no oil contamination after spill
JUN 5 2019

Prior to final washing of impervious surfaces surrounding Boiler Room and flushing
underground piping, a second underflow dam was constructed in the drainage ditch at the NW
corner of the property as an additional precaution (Fig. 5).
Figure 5: Second underflow dam constructed in drainage ditch on NE corner of property
All concrete surfaces which had been in contact with oil contamination have been cleaned
utilizing oil soak pads and pressure washers. Following this, drains have been flushed to
remove residual oil
All grass, dirt, and gravel surfaces which had been in contact with oil contamination have been
scraped clean by utilizing oil soak pads, skid steers, excavators, and shovels. Where oil -stained
gravel was removed, new gravel will be installed.
To remove the oil from the holding pond on Seiren property, the pond will be drained, and the
floor of the pond will be scraped clean. At that time, a STAT, Inc. geologist will test the
remaining soil to ensure all oil residue has been removed. It is estimated that this entire
process will take 1-2 weeks.
JUN 5 2019