NC0020737_July 2017 Status Report_20170623

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P.O. BOX 429 • KINGS MOUNTAIN, NORTH CAROLINA 28086 • 704-734-0333
June 26 , 2017
Derek Denard
North Carolina Department of Environmental Quality
Water Quality Division RECEIVEDINCDEWWR
1617 Mail Service Center JUN 2 3 2017
Raleigh, NC 27699-1617
Water Uuanty
Permitting Section
Subject: July 2017 Status Report for Pilot Creek WWTP
Mr. Denard,
The City of Kings Mountain holds NPDES Permit NC0020737. After receipt of the Special Order
of Consent (SOC) by the Environmental Management Commision, Pilot Creek has submitted
quarterly Status Reports; informing the State, of ongoing efforts made to reduce thallium in the
collection system for the City of Kings Mountain. These reports will be submitted quarterly
until May 31, 2018, as stated in the Scheduled Activity section, Section 2. (b).
The following has taken place between Steag Energy Services and Pilot Creek WWTP (POTW) in
order to reduce/monitor thallium in the facility and POTW effluent.
March 20, 2017
Monitor only limit set for thallium during the trial run (injection of poly -s). Expiration date set
for May 1, 2017.
March 31, 2017
Received NOV response for February (industry sampling) violations(2). On 2/1/17 TI= 1.27mg/L.
2/8/17 TI= 0.342mg/L. Permit for this timeframe had a limit on TI of 0.315mg/L. After
thallium was retested, results yeilded as follows: 3/24/17 TI= <0.020mg/L; 3/27/17
TI=0.021mg/L.
April 18, 2017
Received mothly Thallium report. Time -frame for this report was 3/18/17- 4/18/17. During this
time, Steag pulled 220+ in-house samples. These samples were analyzed in-house to determine
effectiveness of pretreatment processes & for R & D studies.
The Historical City

April 19, 2017
POTW performed the semi-annual sampling event at Steag. Upon receipt of these results,
Steag was issued an NOV for limit violation for TSS. Permit # 0032 states a limit for TSS of 100
mg/L. Results indicated TSS of 325 mg/L on 4/19/17. During this event, thallium yeilded
<10ug/L.
April 25, 2017
Annual Inspection/meeting took place at Steag. Steag was made aware that on May 1st
thallium limit (permit modification) would become effective. This modification would include a
thallium limit of 0.314 mg/L.
Steag has requested a meeting with NCDENR to see where the POTW stands upon expiration of
the SOC. We are all concerned with the limit that will be set (1.43 ug/L) in the event an
extention doesn't take place, or a limit increase doesn't occur.
Steag informed the POTW of the following upcoming plans at their facility:
• Expand the poly -s injection to all tanks. Previuosly poly -s was only used in the acidic
tanks. This would include base tanks.
• Adding secondary filtration on final effluent. This filtration would have an alarm sound
when a issue occurs in the filtration process.
• Install sampling system for small scale sampling
Meeting has been set for June 6th, between Steag, the City of KM, and NCDENR.
May 1St, 2017
Thallium limit is now effective. This limit is set on a monthly sampling frequency at 0.315 mg/L.
May 31, 2017
Meeting held to discuss upcoming meeting with NCDENR. As of May 24th, Steag began to treat
all wastewater tanks with poly -s. Previously only acidic tanks were treated with poly -s.
Mike Mattes (Steag CEO) informed the POTW that he has visited some facilities which have
sand filters. He noticed a decrease in solids up to 90%. Steag plans on installing one of these
filtration systems at their Kings Mountain facility. Theis Hoffman believes thallium attaches
itself to solids, therefore, by removing the solids, this will decrease the thallium in the effluent.
June 6, 2017
The City of Kings Mountain, along with Steag Energy Services, met at the Moorseville Regional
Office to discuss the progress made with Steag's effluent discharge. This was a very informative

meeting. For preparation of this meeting, Steag and the City worked hand-in-hand to provide a
power point presentation to give insite on everything up to this point. During this meeting
Steag provided background information along with all steps taken up to date in order to reduce
the amount of thallium being discharged to the City's POTW. The City has directly worked with
Steag in the reduction as much as possible. Numerous permit modifications have been made in
order to assist Steag in not obtaining a non-compliant discharge.
Attached is the mention power point presentation for your review. This will summeraize efforts
made to date. The attachment also provides data trend charts to show the decrease in thallium
up to this point.
Pilot Creek will continue to run the belt press to reduce the amount of thallium in our effluent
discharge.
If you have any questions, feel free to contact me anytime.
Sincerely,
Richelle Meek
City of Kings Mountain
WWTP Superintendent/Pretreatment Coordinator
[e-mail]
Office #: [phone]

Rickey Duncan - Director Water Resources Thies Hoffmann - EVP & COO
Richelle Meek - WWTP Superintendent Mike Mattes - CEO

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Regeneration Experience by Utilities
51 of 65 Utilities
■ Have Regenerated - Have Not Regenerated
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Regeneration Experience by Installed Mw
133,000Mw of 148,000Mw
■ Have Regenerated w Have Not Regenerated
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SCR catalyst removes - 6 million tons of NOx / year
Eliminates - 10,000 tons / year of landfill waste
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1974 1907 2000 2017
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1. SST begins
development of lab TI
treatment method
1. City of KM — TI
measured in Priority
Pollutant Analysis
(PPA)
2. SST not treating for TI
1. City Of KM — TI below
detection limit in PPA
2. SST develops TI lab treatment
method using Poly -S
3. First plant trials
1. SST 20,000 ppb spike
Q2'15 Q3'15 Q4'15 Q1'16 Q2'16
1. SST identifies TI
sources (acid stream,
fly ash, catalyst)
2. Purchased ICP
1. SST treating basic
tanks
2. SST researching
polishing filters
Q3'16 Q4'16 Q1'17 Q2'17
1. SST reduces TI to 200
-2,000ppb range
2. Improved in-house DL
to 10 ppb
1. SST treating acid tanks
2. SST reduces TI to 20 — 200 ppb
range
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TI concentrations vary by coal and catalyst type
Total Suspended Solids (TSS) is limiting TI discharge levels
Measuring TI below 10ppb in an industrial waste water application
SST treats - 24 different 5,000 gal. batches per day
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20,000
18,000
16,000
14,000
12,000
a 10,000
1=
8,000
6,000
4,000
2,000
0
�y
Oyl
SST Effluent Trend
II i77-111 1111111 711r11,1
yo yO yo yo yo yo 1 y1 y1 y1 y1
0 oti oy oti o1 oti oti oti oy oy oy� o�:
Significant Variation
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City of Kings Mountain
• Permit modifications beginning January 2016 to assist SST during plant trials
• Monthly meetings held to determine progress of thallium reduction
• Semi-annual inspections/sampling
Increased operation of belt press to reduce thallium in POTW effluent
SST
• Extensive research hours — 51000 ($360k)
• Dedicated waste water engineer hired in 2015
• Invested in additional ICP analyzer ($200K)
• Extensive monitoring — 20-50 samples per day ($100K)
• Installed additional Thallium treating system in February 2017 ($100K)
• Treating all discharged water for TI since 5/24/2017
• Replacing filter cloths every 6 vs 12 months ($20K)
TI Improvement Spend - $600,000 (Excluding treatment costs)
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City of Kings Mountain
• Increase monitoring
• Increase belt press operations as needed to remove TI
Expected increase flow at POTW in July 2018 (NTE beginning operation)
SST
a Add polishing final filter by Q4'17 ($200K)
• Continue monitoring and treatment programs
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100.0
90.0
80.0
70.0
60.0
a 50.0
40.0
30.0
20.0
10.0
City of KM Data
• Influent (µg/L) Effluent (µg/L)
31 -Jan -16 21 -Mar -16 10 -May -16 29 -Jun -16 18 -Aug -16 07 -Oct -16 26 -Nov -16 15 -Jan -17 06 -Mar -17 25 -Apr -17 14 -Jun -17
Significant Progress
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120.0
100.0
80.0
J
3 60.0
40.0
1
•
20.0
City of KM Data
•• • Influent (µg/L) * Effluent (µg/L)
•
21 -Mar -16 10 -May -16 29 -Jun -16
•
•
18 -Aug -16 07 -Oct -16 26 -Nov -16 15 -Jan -17 06 -Mar -17 25 -Apr -17 14 -Jun -17
City of KM Effluent Significantly Below 60 ug/L
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SST External Effluent (µg/L)
STEAG SCR -Tech
A,, E rr v t r o rr rt! em t a) ScrY ce% Comp r,, p,
350.0
� � � � � � � � � � Permit Limit of 315 ug/I Thallium � i• � r � r. �.. � � �
300.0
250.0
J 200.0
~ 150.0
100.0
50.0
- I
16 -Mar -17 23 -Mar -17
30 -Mar -17 06 -Apr -17
a 1
13 -Apr -17 20 -Apr -17
Ia it 0
27 -Apr -17 04 -May -17
SST Significantly Below 315 ug/L
11 -May -17 18 -May -17
25-May-
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City of KM and SST have made significant progress
Current SST spend - $600,000
TI treatment process - Reduced peaks from 20,000 to 250 range
Intensive monitoring process in place
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City of Kings Mountain
45 ug/L
% MARL still available: 54.8% (with lower discharge limit of 200,000 GPD for SST)
SST
0 250 ug/L
W Lower discharge volume from 400,000 to 200,000 GPD
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