NC0079227_Approval_20180613

WaterResources
ENVIRONMENTAL QUALITY
June 13, 2018
Russell E. Eiler, Director, Global EIIS Compliance
Schlage Lock Company LLC
11819 N.Pennsylvania Street
Carmel, Indiana 46032
Subject:
Dear Mr. Eiler:
ROY COOPER
Gom".
MICHAEL S. REGAN
Semlary
LINDA CULPEPPER
ham., Director
NPDES Permit NCO079227
Review of Application to Modify Permit for
the Former Schlage Lock Plant
GW-REM — Class PC-1
213 Red Iron Road, Rocky Mount 27804
Nash County
The Division of Water Resources (the Division or DWR) has reviewed your application (received
April 3, 2018) to modify the subject permit. We do not believe the permit needs to be modified for
you to proceed.
We understand you propose to vaporize liquid -phase organic compounds to facilitate contaminant
removal in the subsurface, then condense the vapor back to liquid for treatment prior to discharge.
We have considered the potential impacts to the receiving stream of changes in process
temperature, and have also reconsidered the list of parameters of concern (POCs).
The Division concludes that a permit modification is not required if the condensate effluent is
treated, as is the extracted groundwater, such that all discharges meet existing permit limits and
conditions. Lastly, please note that we have updated your site -vicinity map (see attached).
If you have questions, or if we can further assist you, please contact Joe R. Corporon L.G. at
fioe.comoron0mcdenngovl or call his direct line [phone].
Linda Culpepper
Enclosure: Site -Vicinity Map
hc: Central Files
NPDES Program Files
DWR/RRO Supervisor, Danny Smith
ec: ATU, Susan Meadows
OCU, Maureen Kinney
DWR/RRO Supervisor, Danny Smith

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Schlage Lock Company LLC
Facility
Former Schlage Lock Plant - GW-REM
Location
not to Scale
Receiving Stream: UT of Beach Branch Drainage Basin: Tar -Pamlico
Latitude: 36' 01' 28" N Longitude: 770 46' 04" W
Sub -Basin: 03-03-02 Permitted Flow: 0.124 MGD
NPDES Pernut NC0079227
State Grid / USGS Ouad: C 27 SE / Drake, NC Stream Class: C-NSW
North
Nash County

Corporon, Joe: MOD review LOG / Fact
79227 - Schlage LockAant - GW-REM; system MOD
20Apr2018 -- assigned to Joe.
01May2018 -- Jeff Ahrens P.E., Principal Engineer, Geosyntec [704-227-0850] called to ask
about progress on MOD. Joe has yet to review the MOD request.
08May2018 -- Rob Mcdaniel (DEMLR/HWM; Hydrogeologist, PJM; 919-707-8215) called to
offer his assistance with MOD; said Schlage does are on Lazerfiche, EPA ID# =
NCD065300519; will email CAP to Joe. Permittee applying electrodes to plume; vapor -phase to
be collected and treated. Active in the next month or two. Joe to copy Rob on the MOD
response letter. Updated BIMs Events/initiated MOD review.
09Mav2018 Notes: Permittee proposes to add "thermo-treatment" to vaporize parameters of
concern (POCs); new processes will add —2.1 gpm [0.0030 MGD] to the flow currently
averaging 0.02722 MGD [about 22% of permitted flow], but the Permittee will simultaneously
abandon 3 recovery wells, resulting in —no net gain in flow.
The remediation target, PCE (99% reduction), enters treatment @ — 1,000 ug/L will be treated to
9 ug/L; temperature is expected to resolve to ambient through the system long before discharge,
and is therefore is not a POC. Julie Grzyb discussed needs with the Permittee prior to
application (021762018) saying that, beyond temperature (effluent, U&D), no modifications
(limits or flow rate) are anticipated.
Facts considered during MOD request review:
1. POCs monitoring frequency - continuous flow Ave 0.027 MGD /
190k gallons/week (27,142 gpd).
2. update O&G to reflect EPA test method — decided "no."
3. adding metals (?) — decided "no."
4. considered Temperature monitoring for "heat" process added — decided not
a factor at discharge
5. reviewed parameters of concern (POCs) — no changes recommended
30May2018 -- Confirmation by NPDES Staff [Julie / John]
Conclusion: No permit changes recommended; generate letter for signature by John Hennessy.

Geosyntecc>
consultants
Geosyntec Consultants of NC. PC
2501 Blue Ridge Road, Suite 430
Raleigh, North Carolina 27607
PH 919.870.0576
w .geosyntec.com
February 22, 2018
Ms. Julie A. Grzyb RECEIVED/DENR/0WR
Supervisor
NPDES Complex Permitting NPR - 3 2018
North Carolina DEQ/Division of Water Resources/Water Quality Permitting
1617 Mail Service Center Water Resource.
Raleigh, North Carolina 27699-1617 Permitting Section
Subject: Modification Request for NPDES Permit NCO079227
Former Schlage Lock Facility
213 Red Iron Rd.
Rocky Mount, Nash County, NC
L
Dear Ms. Grzyb:
Geosyntec Consultants of NC, PC (Geosyntec) is working on behalf of Schlage Lock Company
LLC (Schlage) to conduct environmental remediation activities at the Former Schlage Lock
Facility located at 213 Red Iron Road in Rocky Mount, North Carolina (Site). Environmental
activities at the Site are being conducted in accordance with a North Carolina Department of
Environmental Quality (NCDEQ) issued Administrative Order (AO) in Lieu of a Post -Closure
Permit, which initially became effective in December 2011 and was updated in December 2016
(Docket Number AA2011-084). Currently, remedial activities at the Site include the operation of
a groundwater extraction and treatment system, which treats chlorinated volatile organic
compound (CVOC) impacted groundwater prior to discharge under an existing National Pollutant
Discharge Elimination System (NPDES) Permit NCO079227 (Attachment 1). As we have
discussed with you in a phone conversation on 02 February 2018, and as presented in this
correspondence, Geosyntec is requesting a modification to NPDES Permit NC0079227, to
implement additional remedial actions at the Site using in situ thermal remediation (ISTR), which
is proposed to discharge its treated effluent into the existing groundwater extraction and treatment
system prior to discharge in the existing NPDES Outfall 001. The NPDES permit modification
request form (NPDES Permit Application - Short Form C — GW) is provided as Attachment 2.
Purpose of Modification Request
A groundwater extraction and treatment system has been in operation at the Site since 1992 to
address CVOCs in groundwater. While the groundwater distribution of CVOCs has been relatively
Former Schlage Lock Facility, Rocky Mount, NC
engineers I scientists I innovators

Ms. Julie A. Grcyb
22 February 2018
Page 2
stable in recent years, a more aggressive source zone remedial strategy has been approved by
NCDEQ as part of an NCDEQ-approved Site Closure Strategy. An evaluation of targeted source
zone remedial technologies led to the concurrent decision by Geosyntec, Schlage, and NCDEQ to
reduce CVOC mass via ISTR, as documented in an Interim Measures Work Plan (June 2017). The
proposed ISTR system will utilize Electrical Resistive Heating (ERH) to heat up the subsurface
beyond the boiling point of the CVOCs and remove contaminants with vapor recovery wells. The
extracted steam and vapors will be separated into liquid and vapor streams, cooled, and treated
above -grade in a modular treatment system operated at the Site by the ISTR contractor. After pre-
treatment by the ISTR contractor, the liquid -phase effluent is proposed to be discharged to the
existing on -Site groundwater extraction treatment system, where it will combine with extracted
groundwater from operating recovery wells. The groundwater extraction and treatment system will
serve as secondary treatment and the combined treated groundwater will discharge to the existing
Outfall 001.
The ISTR system construction and operation process is anticipated to take approximately one year
to complete (we anticipate construction to begin in Spring 2018), and the modular equipment will
be removed following ISTR operations, at which point the groundwater extraction and treatment
system operations are anticipated to continue. Please note that the groundwater extraction and
treatment system will continue to operate during ISTR construction and operation; however, some
pumping wells located within the footprint of the ISTR treatment zone will be abandoned.
Description of Existing Groundwater Extraction and Treatment System and Permitted
Discharge
The existing groundwater extraction and treatment system currently consists of sixteen recovery
wells (nine in the Middle Aquifer and seven in the Lower Aquifer). Prior to implementation of the
ISTR system, three Middle Aquifer recovery wells (RW-2, RW-3 and RW-7, which have a
combined average extraction rate of approximately 2 gallons per minute [gpm]), will be
abandoned. Extracted groundwater is piped to the treatment building where it passes through an
equalization tank, an air stripper, and bag filers prior to discharge via permitted Outfall 001 to an
Unnamed Tributary of Beech Branch. A USGS map showing the location of the permitted Outfall
001 is provided as within the existing NPDES permit, included as Attachment 1.
Between 2003 and 2017, the average pumping rate of the system was 18.9 gpm (equivalent to
0.027 million gallons per day [MGD]). The effluent from the treatment system is monitored in
Fortner Schlage Lock Facility, Rocky Mount, NC
engineers I scientists I innovators

Ms. Julie A. Grzyb
22 February 2018
Page 3
accordance with NPDES permit NC0079227 (effective June 1, 2015 through October 31, 2019)
(Attachment 1). The system's average flow rate (monitored continuously) between 2003 and 2017
was less than 22 percent of the 0.124 MGD permit limit.
Pursuant to the existing NPDES permit, groundwater extraction and treatment system effluent
samples are analyzed twice per month for Oil and Grease, Total Suspended Solids, pH, and
temperature; and quarterly for select VOCs and chronic toxicity. Oil and Grease, Total Suspended
Solids, and pH in the effluent are consistently within permit limits. VOC concentrations in the
effluent have remained consistently below laboratory detection limits (i.e. less than 1 µg/L). In the
treatment system influent, the average concentration of the primary VOC of concern,
tetrachloroethylene (PCE), was 4,035 micrograms per liter (µg/L) between 2003 and 2017. The
reduction in tetrachloroethylene concentration demonstrates that the removal efficiency of the
treatment system is greater than 99.9%. The most recent monthly and quarterly sampling results
are provided as Attachment 3.
Proposed In Situ Thermal Remediation System
The proposed ISTR system will achieve a significant removal of CVOCs (estimates of source area
CVOC mass removal of approximately 12,000 Ibs) through heating of the subsurface and
subsequent recovery of volatilized CVOCs and steam. Vapor recovery (VR) wells will convey the
extracted steam and vapors to modular treatment components, including a process to separate
liquids and vapors, a steam condenser system, a vapor treatment system, and a condensate
treatment system. The condensate treatment system includes both a cooling process and an
adsorption process to remove CVOCs in the condensed liquid. The vapor treatment system will be
subject to its own air permit process, which is being addressed separately with NCDEQ. TRS
Group, Inc. (TRS) has been selected as the ISTR contractor. A process flow diagram and detailed
process and instrumentation diagrams (P&IDs) for the liquid -phase treatment components of the
ISTR system, provided by TRS, are included as Attachment 4.
The average condensate production rate produced by the ISTR system is expected to be
approximately 1.8 gpm and is expected to contain approximately 1,000 µg/L PCE prior to
treatment. The water treatment system for the condensate will consist of tanks for sedimentation,
bag filters to capture remaining suspended solids, liquid granular activated carbon (LGAC) vessels
to provide 99% reduction in CVOC concentrations via adsorption, and a heat exchanger to reduce
Former Schlage Lock Facility, Rocky Mount, NC
engineers I scientists I innovators

Ms. Julie A. Grzyb
22 February 2018
Page 4
water temperature to that of the extracted groundwater. Sampling ports are included in the influent
line to each LGAC vessel and at the effluent of the heat exchanger.
The heat exchanger in the steam condenser system is water-cooled by recirculating potable water
within two cooling towers. The cooling water will not come into contact with the steam from the
subsurface. The cooling water will periodically blowdown to control mineral buildup at an
anticipated average rate of 0.3 gpm.
The treated condensate stream will join the potable water blowdown stream for an expected
combined flowrate of 2.1 gpm (0.0030 MGD) and an approximate PCE concentration of 9 µg/L.
The treated effluent will then enter the existing on -Site treatment system where it will join
extracted groundwater and pass through the settling, air stripping, and filtration processes prior to
discharge via existing Outfall 001. A process flow diagram for the existing pump -and -treat system,
annotated with the proposed thermal effluent insertion point, is provided as Attachment 5.
In summary, the thermal system will add approximately 2.1 gpm of treated water into the existing
treatment system, which is currently only processing less than 22 percent of its 0.124 MGD limit
at an average flowrate of 18.9 gpm. Additionally, it is noted that the abandonment of three recovery
wells will result in a reduction of approximately 2 gpm from the groundwater extraction and
treatment system. The thermal effluent will be treated by LGAC adsorption, cooled to the same
temperature as the extracted groundwater, and then combined with extracted groundwater for
secondary treatment by air stripping. The water quality of the effluent in Outfall 001 is expected
to be comparable to existing conditions and to meet permit limits.
Per discussion with you by telephone on 02 February 2018, Geosyntec understands that the
existing NPDES permit will need to be modified to include an explicit temperature requirement,
in consideration of the new remedial process that has been proposed. No other modifications (e.g.,
flow rate, CVOC limits, etc.) are anticipated to be required. The thermal treatment system is
scheduled to be installed between April 2018 and July 2018. Thermal operations are planned to
begin in July 2018 and end in the second quarter of 2019, which is within the dates of the current
NPDES permit authorization. Geosyntec greatly appreciates your attention to this requested
modification in order to facilitate a timely installation of the remedy and path to closure.
Former Schlage Lock Facility, Rocky Mount, NC
engineers I scientists I innovators

Ms. Julie A. Grzyb
22 February 2018
Page 5
Should you have any questions regarding this submittal, please contact the undersigned at (704)
227-0850.
f Ahren.
Principal Engineer
Attachments: 1— Existing NPDES Permit NCO079227
2 - NC Form C-GW
Sincerely,
Wayne Amber, Ph.D.
Project Manager
3 - Recent monthly and quarterly sampling results
4 - Proposed Thermal Process Diagrams
5 - Existing System Process Diagram
Copies to: Mr. Russ Eiler - Schlage
Former Schlage Lock Facility, Rocky Mount, NC
engineers I scientists I innovators

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