NC0080853_Varience Request_20170504

AECOM
Mr. Charles Weaver
Division of Water Quality
1617 Mail Service Center
Raleigh, NC 27699-1617
AECOM
1600 Perimeter Park
Morrisville, NC 27560
USA
T: 919.461.1100
F: 919.464.1415
aecom.com
t
May 4, 2
MAY 6
Subject: Request for Permit Condition Variance DENR-LAND Cii /';L' -.IT
NPDES Permit No. NCO080853 GTORMWATER PEP ; ; ,<-
Alcatel -Lucent USA Inc.
3370 Lexington Road, Winston-Salem, North Carolina
Dear Mr. Weaver,
On behalf of Alcatel -Lucent USA, Inc. (Alcatel -Lucent), AECOM Technical Services of North Carolina, Inc.
(AECOM) is requesting a variance from the permit conditions for the above -referenced National Pollutant
Discharge Elimination System (NPDES) Permit. As specified on the Supplement to Permit Cover Sheet
included in the November 15, 2012, NPDES Permit Modification Letter, the groundwater remediation
treatment system consists of extraction wells, a feed -water equalization tank, bag filtration, a low profile air
stripper, and granular activated carbon (GAC). On April 28, 2017, the operator in responsible charge
identified a small hole in the bottom of the GAC unit. This hole renders the GAC unit inoperable, and the
groundwater remediation treatment system is currently shut down.
Operation of the groundwater remediation treatment system is required by the Site's Resource
Conservation and Recovery Act Permit. As a result, AECOM is requesting permission to bypass the GAC
unit and continue operating the system with treatment via air stripping only. The attached Figure 1
summarizes tetrachloroethylene (PCE) concentrations detected in air stripper effluent samples collected
between 2014 and 2017. As shown, the highest post -air stripper PCE concentration detected during this
time was 8.8 micrograms per liter (pg/L), which is below the NPDES Discharge Limit of 17 pg/L. Analytical
results for the most recent air stripper effluent sample (collected May 1, 2017) are summarized on Table 1.
Cis-1,2-dichlroethylene was detected at 0.81 pg/L. No other compounds were detected above laboratory
detection limits.
AECOM is currently investigating the cause of the leak and exploring options for replacing the GAC unit.
Options being considered include installing a replacement GAC unit or eliminating GAC treatment in favor
of a secondary air stripping unit. Based on the existing air stripper's ability to meet NPDES discharge
limits, as demonstrated by the data presented on Figure 1, AECOM is requesting permission to continue
operating the system without the GAC unit while replacement options are investigated.
Please note that the facility's NPDES Permit expired on June 30, 2014; however, Alcatel -Lucent submitted
the permit renewal application to the Division of Water Resources on December 31, 2013. Because the
facility requested renewal of the permit at least 180 days prior to the expiration date, the facility is
automatically authorized to discharge beyond the permit expiration date, as stated in permit condition
II.B.10.

A=COM
Mr. Charles Weaver
Request for Permit Condition Variance
Thank you for your consideration of this request. If you have any questions or require any additional
information, please contact Erin Stewart at [phone].
Yours sincerely,
Christopher Mason
Staff Scientist
Attachments
cc: G. Fisher, Alcatel -Lucent
Ou��aA
Erin Stewart, P.G.
Project Manager
2/2

Figure 1
PCE Concentrations in Airstripper Effluent Samples
Alcatel -Lucent USA Inc. (NPDES Permit No. NCO080853 )
Winston-Salem North Carolina
20
18 PCE Discharge Limit = 17 µg/L
16
M 10
u
8
U 6
E
2
C
O,y`o O,�`o
O
PCE

Table 1
Summary of Airstripper Effluent Analytical Results
May 1, 2017
Alcatel -Lucent USA Inc. (NPDES Permit No. NC0080953)
Winston-Salem, North Carolina
•
1,1,1 -Trichloroethane
NPDESDischarge Airstripper
Standard Limit
200 --
5/112017
<0.50
1,1-Dichloroethane
6 --
<0.50
1,1-Dichloroethylene
350 --
<0.50
1,2-Dichloroethane
0.4 --
<0.50
Acetone
6000 --
<5.0
Carbon Tetrachloride
0.3 --
<0.50
Chloroform
70 --
<0.50
cis-1,2-Dichloroethene
70 --
0.81
Methyl Ethyl Ketone
4000 --
<5.0
Methylene Chloride
5 --
<1.0
Tetrachloroethene
0.7 17
<0.50
trans-1,2-Dichloroethene
100 --
<0.50
Trichloroethene
3 --
<0.50
Vinyl Chloride
0.03 --
<0.50
Notes:
NCAC 2L Standard - Title 15A North Carolina Administrative Code 2L Standards (April 2013)
NPDES Discharge Limits based on NPDES Permit No. NCO080853 issued June 12, 2009 (modified November 15, 2012).
Listed volatile organic compounds (VOCs) based on those specified in Tabe IV -I of the site's RCRA Permit
Results reported in micrograms per liter (Ng/L)
Bold results exceed the laboratory detection limit.
AECOM