NC0047384_More Information Received_20190322

RECEIVED/DENR/DWR
MAR 26 2019
Date: March 22 2019 Water Resources
PermiKing Section
To: Deborah Gore and Vivien Zhong }
From: City of Greensboro Industrial Waste Section
RE: Response to DE Comments on T. Z. Osborne TZO Headworks Analysis(HWA)-
In
Background Information:
• The TZO POTW has been under construction continuously for the last 4 years and this
BNR project (to comply with Jordan Lake Rules) will be completed in CY 2020.
• The on -going construction and resulting power shut -downs, plant shutdowns, tanks out of
service, and historic precipitation events have impacted TZO NPDES compliance.
However, the non-compliance for CBOD was in no way related to any industrial
incidents or the current industrial loading.
• The North Buffalo POTW was decommissioned October 6, 2017. Since that date all
wastewater for the City of Greensboro has been treated at TZO.
• The flow from the North Buffalo pump station enters TZO after the influent sampling
location.
• After October 2017, the TZO/NB flow ratio was —55/45. We recognized in early 2017
that the influent values for CBOD, TSS, NH3-N and Total Phosphorus were being
grossly overestimated by using only the TZO influent values for the entire flow. The
decision was made to once again sample the North Buffalo influent daily (just as when
the POTW was in operation) and calculate a daily flow -weighted average for the TZO
influent. This value would represent the true loading to the TZO POTW.
• Overestimation of TZO influent loading (for most of the data in the HWA submittal
period) obviously resulted in an overestimation of the uncontrollable values used in the
original HWA. In this subsequent HWA submittal we have:
o Recalculated influent values for CBOD, TSS, NH3-N and Total Phosphorus using
2WLthe TZO flow -weighted average influent data (4/1/2018 to 2/28/2019)
o Reviewed the resulting recalculated uncontrollable values for CBOD, TSS, NH3-
N and Total Phosphorus and used them in today's HWA submittal (chart below)
• Today's HWA resubmittal includes:
o Changes we accepted from Vivien's original review in salmon
o Changes we made to today's submittal in green with specific comments below
o Updated Master Data Spreadsheets for CBOD, TSS, NH3-N, TP
o Updated Uncontrollable Spreadsheet
o Updated HWA/AT Spreadsheet (updated AT also submitted today for 2018 PAR)
• Please note upon engineer certification, we will submit a HWA in 2020 to address flow
limit change from 40 MGD to 56 MGD (flow increase in current tiered NPDES permit).
Greensboro Response to DEQ HWA Comments- March 22, 2019 page I

City of Greensboro Response to HWA Comments from DEQ: [DEQ comments in bold]
From Vivien email: I have a few comments as regard to the HWA review. Please let me
know what you think.
1. Since North Buffalo WWTP closed in October 2017, the flow data from November 2017
through August 2018 were used, which I believe would be more representative to the
total average flow of Osborne. The average flow was updated to 32.605 MGD. The
uncontrollable flow was updated to 30.506 based on the uncontrollable mass balance
sheet.
We are in agreement with the use of the shorter time period for the flow averages.
2. NPDES permit limits: Selenium limit of 0.0052 mg/L was added according to the
NPDES permit.
Selenium: We agree with this correction, as we inadvertently submitted the water quality
standard calculation when we failed to put the selenium limit value in the NPDES limit
column.
TP limit was updated to 0.92 mg/L, which was calculated by dividing the total # by 365
by 8.34 and then by the permitted flow.
Total Phosphorus: As noted in the original narrative, the T. Z. Osborne POTW uses
chemical removal for phosphorus and the removal rate calculated is not the maximum
removal rate that can be achieved. Therefore, we are not in agreement with the change
using the permitted flow in lieu of the actual flow for the NPDES permit limit. We have
recalculated the NPDES limit using the actual flow change (32.605 MGD) by Vivien. It
is now 1.130 mg/l.
3. Design value for BOD: In the 2007 memo, the multiplier of 1.5 would be applicable
when the WWTP has full compliance for the previous 2 years. There were a few BOD
violations in April, May and July 2017, thus the multiplier would not apply unless there
were reasonable explanations.
BOD MARL: As noted in the introduction, it is important to state that the CBOD
violations were caused by construction activities and historical weather events, not by
overallocation of CBOD or industrial discharges. We have not changed Vivien's Design
Value because we will be submitting a new HWA in 2020 and think the current MAHL
will be sufficient for that short period of time.
Greensboro Response to DEQ HWA Comments- March 22, 2019 page 2

4. Inhibition loadings: Literature Cone. for Ammonia were added, for Lead was updated.
The highest site specific values in the aeration basin were chosen for Selenium and Zinc.
Ammonia: We concur with the addition of the 480 mg/1 inhibition concentration.
Lead: We agree with your correction using the 0.5 mg/l inhibition value.
Selenium: We agree with your correction using the 0.0259 mg/l inhibition value.
Zinc: We agree with your correction using the 1.85 mg/l inhibition value.
5. Uncontrollable mass balance: A few uncontrollable sampling data were updated to be
consistent with the uncontrollable data summary sheet. They were highlighted in the
attached mass balance sheet. Ammonia and TP values were updated accordingly.
a. BOD and TSS: the literature cone. for BOD were selected, which leads to
about 20,000 lbs/day uncounted and the result shows 20,000 lbs/day more
that you could allocate to your future industries. The same applies to TSS.
We believe choosing the mass balance values would be more realistic and
protective for the WWTP.
On April 1, 2018 we implemented a ratio calculation of the two influent wastewater lines to
the T. Z. Osborne POTW. The "flow -weighted influent concentration" reflects the
actual loading to the POTW. The two incoming lines (North Buffalo Transfer Line and the
T. Z. Osborne influent line) provide close to the same volume of incoming flow but the
T. Z. Osborne line contains most of the industrial strength wastewater, and thus has
significantly higher concentrations. Between October 2017 (when the North Buffalo
POTW closed) and March 2018, only the T. Z. Osborne influent values were used on
the T. Z. Osborne DMR, resulting in a significant overestimation of the influent loading.
The North Buffalo transfer line is now sampled daily (like an influent) and the data is used
with the T. Z. Osborne influent data to generate the calculated influent concentration
reported on the eDMR. At the time of the HWA submittal, we knew the older influent data
was higher than the actual loading, but we only had 3 months of calculated influent data.
We now have 10 months of data that truly depicts the influent loading and can now be used
for updated Mass -Balance calculations for Uncontrollable values.
The T. Z. Osborne average influent concentrations for CBOD, TSS, Ammonia -Nitrogen,
and Total Phosphorus were recalculated using data from April 2018 to February
2019. The changes in the influent concentrations are reflected on the updated mass balance
sheet submitted with this Submittal and are summarized below as follows:
Table 1:
T. Z. Osborne
T. Z. Osborne Influent
Parameter
Influent Value in
Flow Weighted Average Value
(in mg/1)
Original Submittal
in this Submittal
CBOD
442
309
TSS
332.5
300
Ammonia -Nitrogen
23.57
20.12
Total Phosphorus
9.3
6.74
Greensboro Response to DEQ HWA Comments- March 22, 2019 page 3

Obviously the recalculated influent values made a significant difference in the resulting
Uncontrollable mass -balance concentrations as well.
Summa : Uncontrollable Concentrations from Mass Balance
Parameter (in mg/1)
Original Submittal
Vivien Changes
This Submittal
Using Table 1
CBOD
322
333
191
TSS
321
322
287
Ammonia -Nitrogen
23.7
23.7
20.0
Total Phosphorus
8.9
8.91
6.17
The mass balance spreadsheet and the HWA spreadsheet have been modified to indicate the
updated values in this Submittal (changes in green)
6. LTMP Updates. Will be sent under separate cover.
Greensboro Response to DEQ HWA Comments- March 22, 2019 page 4

Flow Weighted Average TZO Influent Data
MA Apr 2018 to Feb 2019 MA Apr 2018 to Feb 2019 MA Apr 2018 to Feb 2019 MA Apr 2018 to Feb 2019
T. Z. Osborne
T. Z. Osborne
T. Z. Osborne
T. Z. Osborne
CBOD MA
TSS MA
NH3N
TP MA
Apr-18
316
Apr-18
296
Apr-18
20.49
Apr-18
8.49
May-18
358
May-18
336
May-18
22.27
May-18
7.49
Jun-18
364
Jun-18
390
Jun-18
24.14
Jun-18
5.72
Jul-18
340
Jul-18
363
Jul-18
21.91
Jul-18
7.13
Aug-18
341
Aug-18
306
Aug-18
20.15
Aug-18
6.20
Sep-18
262
Sep-18
306
Sep-18
18.83
Sep-18
6.56
Oct-18
330
Oct-18
314
Oct-18
20.78
Oct-18
7.18
Nov-18
287
Nov-18
273
Nov-18
19.28
Nov-18
6.99
Dec-18
223
Dec-18
247
Dec-18
16.24
Dec-18
6.07
Jan-19
261
Jan-19
226
Jan-19
16.79
Jan-19
7.00
Feb-19
317
Feb-19
245
Feb-19
20.44
Feb-19
5.33
309
AVG
300
AVG
20.12
AVG
6.74
AVG

Workbook Name: VIVIEN HWA AT with BFM edits 3-19-2019.XLSX• Worksheet Name: HW�i Page, Df5
� nted 3/22/2019, 1:47 PM
A I B
C
D
E I F G H I
J K
1
Headworks Analysis Spreadsheet
HWA TO DEQ POTW Name: T. Z Osborne Vivien changes
CY261$ pAi2 Date. 1?!31/20IS FM edits 3-19-2019
.. `'" # _> NC0047384
POTW NPDES
POTW Sludge Permit # _> N/
POTW NPDES Permitted Flow(MGD)= 40.0 -used in AT only
POTW Average Flow(MGD)= 32.605=usedmtiWAcacnlations
Uncontrollable Flow(MGD)= 30.506
7Q10 Stream Flow(MGD)= 1.36
Stream Classification = WS V'-Class C
Class of Sludge generated (A, or B)
Sludge to Digester Flow(MGD)=
Sludge to Disposal Flow(MGD)=
%Solids to Disposal=
Sludge Site Area(acres)=
Sludge Site Life(yrs)=
Age of Sludge Site(yrs)=l I
Pass -Through Loading Calculations
Spreadsheet Instructions:
1) Applicable Values should be entered in the Heavy Bordered Blue cells. The rest of worksheet is
protected, password is " 2".
2) Additional pollutants can be added in cells A34 to A42. Note all Pollutant names are linked from here
to other pages in HWA worksheet and also to AT worksheet (i.e., automatically entered into other pages
in HWA worksheet and also AT worksheet from HWA worksheet).
3) Formulas are discussed in the Comprehensive Guidance HWA Chapter.
4) HWA, AT and HASL worksheets are linked. MAHLs, Basis, and Uncontrollable load are
automatically entered into AT from this worksheet.
5) If red tab notes are not visible, they can be turned on in the "Tools" menu under "options", in the
"view" tab click the "comment indicator only" button.
Influent Concentration Based on Pass Input "x" to use
Through talc. for different POTW flows Design Crdena
Design Values Average Flow Permitted Plow Loading
WWTF Influent BOD (mg/1) 340 625.0 509.5 X
WWTF Influent TSS (mg/1) 262.5 2238.8 1824.9 X
WWTF Influent NH3 09/1) 27.75 173.9 141.8 X
WWTF Influent Total N(mg/1)
WWTF Influent Total P (mg/1)
2
3
4
5
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
23
Pollutant
NPDES LIMIT
(mg/1) using Total
Metal WQS
Plant Removal
Rate (%)
Removal rate
Source
NPDES Loading
(Ibs/day)
Stream
Standard
(mg/1)
Stream
Standard
Source
Stream
Standard
Loading
(lbs/day)
Design Criteria
Loading (Ibs/day)
Minimum Pass
Thru Loading
(Ibs/day)
Minimum
Pass-Thru
Basis
24
BOD
4.0
99,36
Site -Specific
169,954
113,424
113,424
Design
25
TSS
30
98.66
Site -Specific
609,789
87,570
87,570
Design
26
Ammonia
2.0
98.85
Site -Specific
47,291
9,257
1 9,257
Design
27
Arsenic
45
E1'A LLG 2004
0.05
Class C
25.7516
25.7516
Stream Sid
28
Cadmium
67
EPA LLG 2004
0.002
Class C
1.7168
1.7168
Stream Std
29
Chromium
87.43
Site -Specific
0,05
Class C
112.6763
112,6763
Stream Sid
30
Copper
96.62
Site -Specific
31
Cyanide
69
EPA LLG 2004
0.005
Class C
4.5688
4.5698
Stream Sid
32
Lead
61
EPA LLG 2004
0.025
Class C
18.1582
18.1582
Stream Sid
33
Mercury
93.99
Site -Specific
0.000012
ClassC
0.05656
1 0.05656
Stream Sid
34
Molybdenum
35
Nickel
63.88
Site -Specific
0.088
CLASS
69,0133
69.0133
Stream Sid
36
Selenium
0.0052
50
IPA LLG 2004
2.8280.
2.8280
NPDES
37
Silver
75
EPA I,LG 2004
38
Zinc
1 8T62
Site -Specific
39
Total Nitrogen
40
Tot. Phosphorus
1.13,01
90.55
Site -Specific
3251.5983
3251.599
NPDES
41
c
42
d
43
e
44
f
45
>
46
It
47
I
Modeled after: Chapter 5-HWA Guidance, Appendix 5-A
Revision Date: February 2008
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3. n
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Workbook Name: VIVIEN HWA AT with BFM edits 3-19-2019.XLSX• Worksheet Name: HWA Page2of5
� nted 3/22/2019, 1:47 PM
A B C D E F G H I J K
49
Average Influent N113 (mg/1)
Average Anaerobic Digester N113 (mg/1)
Inhibition Loading Calculations only enter when have ANAIIROBIC digester
50
51
52
Pollutant
Primary
Removal Rate
( % )
Primary Removal
Rate Source
A.S./Nit,/T.F.
Inhibition
Concentration
(mg/1)
A.S./Nit,/T.F.
Inhibition
Concentration
Source
A.S./Nit,/T.F.
Inhibition
Loading
(lbs/day)
Digester
Inhibition
Concentration
(mg/I)
Digester
Inhibition
Cone. Source
Digester
Inhibition
Loading (Ibslday)
Minimum
Inhibition
Loading
(Ibslday)
Minimum
Inhibition
Loading
Source
53
BOD
54
TSS
55
Ammonia
480
130524.3360
13052434
AS/NWIT n
56
Arsenic
0.1
EPA LL 2004
27.1926
27.1926
AS/NiUPF i
57
Cadmium
I
EPA LL 2004
27L9257
271.9257
AS/NWIT it
58
Chromium
0.394
EPA LL 2004
107.1387
107.1387
AS/NiVIT i
59
Copper
0.635
Sim -Specific
172.6728
172.6728
AS/Nit/l'F it
60
Cyanide
0.1
EPA LL 2004
27.1926
27.1926
AS/NitfIT i
61
Lead
0.5
EPA LL 2004
135.9629
1
135,9629
AS/Nit/'I'F it
62
Mercury
0.1
EPA LL 2004
27.1926
27.1926
AS/Nitrl'F i
63
Molybdenum
64
Nickel
0.25
EPA LL 2004
67.9814
67.9814
AS/Nit/]'Fit
65
Selenium
0,0259
EPA LL 2004
7.0429
7.0429
AS/NiV1T it
66
Silver
0.25
EPA LL 1987
67.9814
67.9814
AS/Nit/IT i
67
Zinc
1.95
EPA LL 2004
503.06251
503.0625
AS/Nit/1'P i
68
Total Nitrogen
69
Tot. Phosphorus
70
c
71
d
72
c
73
t
74
g
75
Ih
76
I
Modeled after: Chapter 5-HWA Guidance, Appendix 5-A
Revision Date: February 2008

Workbook Name: VIVIEN HWA AT with BFM edits 3-19-2019.XLSX• Worksheet Name: HWAi Page3of5
� nted 3/22/2019, 1:47 PM
A B C D E F G H I J K
77
78
Sludge Loading Calculations
79
Pollutant
Sludge Ceiling
Concentration
Limit (mg/kg)
Sludge Ceiling
Load
(Ibs/day)
Sludge Ceiling
Load
HASL Calc. -
(Ibs/day)
Cumulative Sludge
Rate Limit
(Ibs/(acre life))
Cumulative
Sludge
Loading
(Ibs/day)
Class A Limits
Monthly
Average Rate
Limit (mg/kg)
Limits
Monthly Avg.
Loading
(Ibs/day)
Class A Limits
Mon. Avg. Load.
HASL Calc. -
(Ibs/day)
Minimum
Sludge
Loading
(Ibs/day)
Minimum
Sludge
Loading
Sorce
80
BOD
81
TSS
82
Ammonia
83
jArsenic
75
36
41
0.0000
I IASL - Cl.
84
lCadmium
85
34
39
0.0000
IIASL - Cl.
85
Chromium
86
Copper
4300
1339
1500
0.0000
1 IASL - CI.
87
Cyanide
88
Lead
840
267
300
0.0000
1IASL - Cl.
89
Mercury
57
15
17
0.0000
1IASL - Cl.
90
Molybdenum
75
0.0000
Cumul. Slud
91
Nickel
420
374
420
0.0000
I IASL - CI.
92
Selenium
100
89
100
0.0000
1IASL - Cl.
93
Silver
94
Zinc
7500
2498
2800
0.0000
HASL - Cl.
95
Total Nitrogen
96
Tot. Phosphorus
97
c
98
d
99
c
100
f
101
g
102
h
103
I
104
Modeled after: Chapter 5-HWA Guidance, Appendix 5-A
Revision Date: February 2008

Workbook Name: VIVIEN HWA AT with BFM edits 3-19-2019.XLSX• Worksheet Name: HW�i Page4of5
� nted 3/22/2019, 1:47 PM
A I B I C I D E F G H I J K
105
Maximum Allowable
Headworks Loading
Calculations
106
Minimum Pass
Through Loading
(Ibs/day)
Pass Through
Source
Minimum
Inhibition
Loading (Ibs/day)
Minimum Inhibition
Loading Source
Minimum
Sludge
Loading
(Ibs/day)
Minimum
Sludge
Loading
Sorce
Maximum
Allowable
Headworks
Loading (Ibs/da
Maximum Allowable
Headworks Loading
Source
107
BOD
113424.0
Design
113424.0
Desi m
108
TSS
87570.0
Design
87570.0
Design
109
Ammonia
9257.4
Design
130524.3360
AS/Nit/'IT inhibition
9257.4
IDesign
110
Arsenic
25.7516
Stream Sid
27.1926
AS/Nit/PF inhibition
25.7516
Stream Sid
Ill
Cadmium
1.7168
Stream Sid
271,9257
AS/Nit/'1T inhibition
1.7168
Stream Sid
112
Chromium
112.6763
Stream Sid
107.1387
AS/Nit/'I'P inhibition
107.1397
AS/Nit/IT inhibition
113
Copper
172.6728
AS/NIUTF inhibition
172,6728
AS/Nit/IT' inhibition
114
Cyanide
4.5688
Stream Sid
27.1926
AS/Nit/I'F inhibition
4.5689
Stream Sid
115
Lead
18.1582
Stream Sid
135.9629
AS/Nit/'I'I inhibition
18.1582
Stream Sid
116
Mercury
0.05656
Stream Sid
27.1926
AS/Nit/fF inhibition
0,05656
Stream Sid
117
Molybdenum
118
Nickel
69.0133
Stream Sid
67.9814
AS/Nit/'IT inhibition
67.9814
AS/Nit/1'F inhibition
119
Selenium
2.8280
NPDFS
7.0429
AS/Nit/TT' inhibition
2.8280
NPDHS
120
Silver
67,9814
AS/Nit/TF inhibition
67.9814
AS/Nit/'IT inhibition
121
Zinc
503,0625
AS/Nit/'IT inhibition
503.0625
AS/NiUIT inhibition
122
Total Nitro en
123
Tot. Phosphorus
3251.6
NPDHS
3251.5983
NPDFS
124
c
125
d
126
e
127
t'
128
g
129
It
130
1
131
Modeled after: Chapter 5-HWA Guidance, Appendix 5-A
Revision Date: February 2008

Workbook Name: VIVIEN HWA AT with BFM edits 3-19-2019.XLSX• Worksheet Name: HWA Page5of5
� nted 3/22/2019, 1:47 PM
A B C D E F G H I J K
132
133
Maximum Allowable
Industrial Loadings
Calculations
Design vs. PasS-
Thru Warning
134
Pollutant
Maximum Allowable
Headworks Loading
(lbslday)
MAHL Basis
Check to Use
HASL Calcs
(x)
Uncontrollable
Concentration
(mg/1)
Uncontrollable
Source
Uncontrollable
Load (lbs/day)
Maximum
Allowable
Industrial Load
(lbslday)
135
BOD
113424.0000
Design
191
Mass -Balance
48594.2276
64829.7724
136
T S S
87570.0000
Design
287
Mass -Balance
73018.5515
14551.4485
137
138
Ammonia
Arsenic
9257.4000
25.7516
Design
Stream Std
0.0025
Balance
ite-s ec Sam
5088.4008
0.6361
4168.9992
25.1156
139
Cadmium
1.7168
Stream Std
0.0005
ass -Balance
0.1272
1.5896
140
Chromium
107.1387
AS/NiU1'F inhibition
N/A
0.0163
ass -Balance
4.1470
102.9917
141
Copper
172.6728
AS/Nit/TF inhibitior
0.060
ite-S ec Sam
15.4942
157.1786
142
Cyanide
4.5688
Stream Std
N/A
0.0041
vg o (M&S)
1.0431
3.5257
143
Lead
18.1582
Stream Std
0.0033
ass -Balance
0.8396
17.3186
144
Mercury
0.05656
Stream Std
0.00005
s-Balance
0.01272
0.04384
145
Molybdenum
146
Nickel
67.9814
AS/Nit/TF inhibitio
0.021JAvg
all 3
5.3428
62.6386
147
Selenium
2.8280
NPDES
0.002
s-Balance
0.7378
2.0902
148
Silver
67.9814
AS/NiVTT inhibition
N/A
0.0023
ass -Balance
0.5852
67.3963
149
Zinc
503.0625
AS/Nit/7'F inhibitior
0.2927
ass -Balance
74.4687
428.5938
150
Total Nitrogen
151
152
Tot. Phosphorus
c
3251.5983
NPDES
ass -Balance
1569.7716
1681.8267
153
d
154
e
155
f
156
g
167
It
158
I
Modeled after: Chapter 5-HWA Guidance, Appendix 5-A
Revision Date: February 2008

Workbook Name: VIVIEN HWA AT with BFM edits 3-19-2019.XLSX, Worksheet Name: AT
Printed: 3/22/2019, 1:46 PM
Page 1 of 2
POTW
NPDESI--
IUP
Count
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
HWA TO DEQ (3-19-2019) Spreadsheet Instructions:
1) Applicable Values should be entered in the Heavy Bordered cells. Rest of worksheet is protected, password is "2".
Headworks last approved: 10/01 /12 2) Formulas are discussed in the Comprehensive Guidance, Chapter 6, Section C.
Allocation Table updated: 09/01/18 3) HWA and AT worksheets in this workbook are linked. Pollutant Names, MAHLs, Basis, and Uncontrollable load in
this AT worksheet are automatically entered from the HWA spreadsheet. This includes pollutant names in columns AT
Permits last modified: 09/01/18 through BK.
T. Z. Osborne
NCO047384
FLOW BOD TSS Ammonia Arsenic Cadmium Chromium Copper Cyanide
Industry Type Renewal Modification Date Permit Limits Permit Limits Permit Limits Permit Limits Permit Limits Permit Limits Permit Limits Permit Limits Permit Limi
INDUSTRY NAMES Permit Pipe of Effective Effective Permit Conc. Load Conc. Load Conc. Load Conc. Load Conc. Load Conc. Load Conc. Load Conc. Load
(please list alphabetically) number number Industry Date Date Expires MGD al/day m /I Ibs/da m /I Ibs/da m /I Ibs/da m /I Ibs/da m /I Ibs/da m /I Ibs/da m /I Ibs/da m /I Ibs/da
Aramark Uniform Services
P051
Pipe 01 1
>25,000 1
09/01/18
08/31/23
0.1500
150,000
Chemol Company, Inc.
P049
Pipe 01 1
414 1
09/01/18
08/31/23
0.0600
60,000
0.05
0.0250
Elastic Fabrics of America
P003
Pipe 01 1>25,000
09/01/18
08/31/23
0.4000
400,000
Evonik 01
P021
Pipe 01
>25,000 1
09/01/18
08/31/23
0.1300
130,000
Evonik 02
P021
Pipe 02
>25,000
09/01/18
08/31/23
0.1300
130,000
Express Container Services
P069
Pipe 01
442
09/01/18
08/31/23
0.03501
35,000
1
0.841
0.2452
Gilbarco
P033
Pipe 01-04
433
09/01/18
08/31/23
0.03001
30,000
0.07
0.0175
1.71
0.4278
2.071
0.5179
0.5
0.1251
Greensboro Industrial Platers 01
P020-01
Pipe 01
413
09/01/18
08/31/23
0.00401
4,000
0.2
0.0067
0.05
0.0017
Greensboro Industrial Platers 02
P020-02
Pi e 02
413
09/01/18
08/31/23
0.00601
6,000
0.2
0.0100
0.05
0.0025
HAECO Airframe Services
P048-01
Pipe 01
433
09TO1/18
08/31/23
0.0075
7,500
0.07
0.0044
1.71
0.1070
2.07
0.1295
0.01
0.0006
IQE was RF Micro Fab 2
P077
Pi e 01
469
09/01/18
08/31/23
0.0100
10,000
0.8300
0.0692
ITG BRANDS former) Lorillard
P004
Pipe 01
>25 000
09/01/18
08/31/23
0.2500
250,000
LANXESS former) Unitex
P025
Pipe 01
414
09/01/18
08/31/23
0.0800
80,000
0.05
0.0334
Machine Specialities
P070
Pi e 01
433
09/01/18
08/31/23
0.0200
20,000
0.07
0.0117
1.71
0.2852
2.07
0.3453
0.03
0.0050
Parker Metal FinishingP028
Pi e 01
413
09/01/18
08/31/23
0.0100
10,000
0.6
0.0500
0.05
0.0042
Piedmont Platin
P075
Pi e 01
433
09/01/18
08/31/23
0.0600
60,000
0.03
0.0150
1.71
0.8557
2.07
1.0358
0.02
0.0100
Precision Fabrics GroupP011
Pi e 01
>25,000
09/01/18
08/31/23
0.3000
300,000
Precor Stren th
P076
Pipe 01
433
09/01/18
08/31/23
0.0350
35,000
0.07
0.0204
1.71
0.4991
2.07
0.6042
0.05
0.0146
Procter & Gamble -Brown Summit
P031-01
Pipe 01
439
09/01/18
08/31/23
0.5500
550,000
0.02
0.0917
Procter & Gamble -Brown Summit
P031-02
Pipe 02
439
09/01/18
08/31/23
0.1000
100,000
Procter & Gamble-SwingRd
P005
Pipe 01
439
09/01/18
08/31/23
0.1000
100,000
0.10
0.0834
Qualica s
P055
Pi e 01
>25,000
09/01/18
08/31/23
0.1000
100,000
QORVO former) RF Micro 3
P073
Pipe 01
469
09/01/18
08/31/23
0.2500
250,000
Shamrock Environmental-BS
P065-01
Pipe 01
437
09/01/18
08/31/23
0.1250
125,000
0.162
0.1689
0.05
0.0521
0.487
0.5077
0.301
0.3138
0.50
0.5213
Shamrock Environmental-BS
P065-02
Pipe 02
437
09/01/18
08/31/23
0.1500
150,000
Shamrock Environmental -Patton
P068
Pipe 01
442
09/01/18
08/31/23
0.0350
35,000
Solenis former) Ashland
P074
-Pipe 01
>25,000
09/01/18
08/31/23
0.0650
65,000
Triad Anodizin & Platin
P029-01
Pipe 01
413
09/01/18
08/31/23
0.0065
6,500
0.2
0.0108
0.20
0.0108
Triad Anodizin & Platin
P029-02
Pipe 02
413
09/01/18
08/31/23
0.0030
31000
0.2
0.0050
0.20
0.0050
United Metal FinishingP040
Pipe 01
433
09/01/18
08/31/23
0.0150
15.000
0.07
0.0088
1.71
0.2139
2.07
0.2590
0.05
0.0063
Vertellus
P002
Pipe 01
414
09/01/18
08/31/23
0.1200
120,000
0.05
0.0500
ZINK Holdings
P043
Pipe 01
>25,000
09/01/18
08/31/23
0.1500
150,000
Column Totals =>
3.4870
3,487,000
0
0
0
0.23811
0.2125
2.8965
3.4507
0.9906
Basis=>
MAHL from HWA (Ibs/day) => NPDES Permitted Flow=>
Uncontrollable Loading (Ibs/day) =>
Total Allowable for Industry (MAIL) (Ibs/day) =>
Total Permitted to Industry (Ibs/day) =>
MAIL left (Ibs/day) =>
Percent Allow. Ind. (MAIL) still available (%) =>
Percent MAHL still available (%) =>
5 Percent MAHL (Ibs/day) =>
NPDES Design
40.0000 113424
30.5060 48594
9.4940 64830
3.4870 0
6.0070 64830
63.3 % 100.0 %
15.0 % 57.2 %
2.0000 5671
Design
87570
73019
14551
0
14551
100.0 %
16.6 %
4379
Design
9257.40
5088.40
4169.00
0.00
4169.00
100.0 %
45.0 %
462.87
Stream Std
AS/Nit/TF
Stream Std inhibition
1.7168 107.1387
0.1272 4.1470
1.5896 102.9917
0.2125 2.8965
1.3771 100.0952
86.6 % 97.2 %
80.2 % 93.4 %
0.0858 5.3569
AS/Nit/TF
inhibition Stream Std
172.6728 4.5688
15.4942 1.0431
157.1786 3.5257
3.4507 0.9906
153.7280 2.5351
97.8 % 71.9 %
89.0 % 55.5 %
8.6336 0.2284
25.7516
0.6361
25.1156
0.2381
24.8775
99.1 %
96.6 %
1.2876
HWA.AT
Revised:March 2018

Workbook Name: VIVIEN HWA AT with BFM edits 3-19-2019.XLSX, Worksheet Name: AT Printed: 3/22/2019, 1:46 PM
Page 2 of 2
**** HWA TO DEQ (3-19-2019)
Headworks last approved: 10/01/12
Allocation Table updated: 09/01/18
Permits last modified: 09/01/18
POTW=>
NPDES# -
IUP
Count
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
AS/Nit/TF
AS/Nit/TF
AS/Nit/TF
Basis=>
Stream Std
Stream Std
inhibition
NPDES
inhibition
inhibition
NPDES
MAHL from HWA (Ibs/day) =>
18.1582
0.056559
67.9814
2.8280
67.9814
503.0625
3251.60
Uncontrollable Loading (Ibs/day) =>
0.8396
0.012721
5.3428
0.7378
0.5852
74.4687
1569.77
Total Allowable for Industry (MAIL) (Ibs/day) =>
17.3186
0.043838
62.6386
2.0902
67.3963
428.5938
1681.83
Total Permitted to Industry (Ibs/day) =>
1.5623
0.001063
4.8364
0.0068
0.4009
5.3253
0.00
11.45
MAIL left (Ibs/day) =>
15.7563
0.042775
57.8022
2.0835
66.9953
423.2685
1670.38
Percent Allow. Ind. (MAIL) still available (%) =>
91.0 %
97.6 %
92.3 %
99.7 %
99.4 %
98.8 %
#######
99.3
Percent MAHL still available (%) =>
86.8 %
75.6 %
85.0 %
P3.3991
73.7 %
98.5 %
84.1 %
#######
51.4 %
5 Percent MAHL (Ibs/da) =>
0.9079
0,002828
0.1414
3.3991
25.1531
162.5799
HWA.AT
Revised:March 2018

• SIU.Uncont.Mass.Bal
2019V
HWA
IUP
Count
1
2
4
5
6
7
8
9
10
11
13
14
15
16
17
18
19
20
21
22
23
25
26
27
28
29
30
31
32
33
34
35
36
37
INDUSTRY Industry
FLOW
Average Dischar e
BOD
Avera e Discharge
TSS
Average Dischar e
AMMONIA
Average Discharge
Average Discharge
CADMIUM
Average Discharge
CHROMIUM
Average Discharge
COPPER
Average Dischar e
CYANIDE
Average Discharge
LEAD
Average Discharge
Average Dischar e
MOLY-7
Average I
NAMES
(please list alphabetically)
Permit/Pipe
number
MGD gal day
Conc. Load
m /I Ibs/da
Conc. Load
m /I Ibs/da
Conc. Load
m /I Ibs/da
Conc. Load
m /I Ibs/da
Conc. Load
m /I Ibs/da
Conc. Load
m /I Ibs/da
Conc. Load
m /I Ibs/da
Conc. Load
m /I Ibs/da
Conc. Load
m /I Ibs/da
Conc. Load
m /I Ibs/da
Conc.
m /I
Aramark
P051/01
0.103244
103,244
1204
1036.71
552
475.30
2.55
2.1957
0.0025
0.0022
0.0005
0.0004
0.07
0.0603
0.12
0.1033
0.006
0.0052
0.02
0.0172
Chemol
P049/01
0.032376
32.376
7555
2039.95
2452
662.07
5.91
1.5958
0.0025
0.0007
0.0005
0.0001
0.03
0.0081
0.03
0.0081
0.0036
0.0010
0.012
0.0032
Elastic Fabrics of America
P003/01
0.307171
307,171
223
571.28
27
69.17
13
33.3035
0.0005
0.0013
0.245
0.6276
0.011
0.0282
0.0025
0.0064
0.0025
0.0064
Evonik I
P021/01
0.014181
14,181
626
74.04
104
12.30
2.65
0.3134
0.0005
0.0001
0.014
0.0017
0.015
0.0018
0.0025
0.0003
0.0025
0.0003
Evonik II
P021/02
0.063243
63,243
5886
3104.55
2486
1311.23
0.16
0.0844
0.0025
0.0013
0.0025
0.0013
0.018
0.0095
0.029
0.0153
0.0025
0.0013
0.0025
0.0013
Express Container Services
P069/01
0.0225
22,500
1862
349.40
46
8.63
22.7
4.2597
0.0005
0.0001
0.007
0.0013
0.02
0.0038
0.007
0.0013
0.0025
0.0005
Gilbarco total all pipes)
P033/01-04
0.01329
13,290
0.001
0.0001
0.0025
0.0003
0.105
0.0116
0.03
0.0033
0.0025
0.0003
Greensboro Ind. Platers I
P020/01
0.00282
2,820
0.001
0.0000
0.017
0.0004
0.124
0.0029
0.0025
0.0001
0.017
0.0004
Greensboro Ind. Platers II
P020/02
0.004647
4,647
0.001
0.0000
6.4
0.2480
0.052
0.0020
0.0025
0.0001
0.066
0.0026
HAECO Timco I
P048/01
0.000653
653
0.001
0.0000
0.024
0.0001
0.078
0.0004
0.006
0.0000
0.012
0.0001
Imperial Tobacco GroupP004/01
0.14026
140,260
370
432.81
115
134.52
5.3
6.1998
0.0025
0.0029
0.0005
0.0006
0.0025
0.0029
0.187
0.2187
0.006
0.0070
0.0025
0.0029
IQE
P077/01
0.00111
1.110
0.123
0.0011
0.004
0.0000
0.006
0.0001
0.019
0.0002
0.0025
0.0000
0.005
0.0000
Lanxess
P025/01
0.0572
57,200
4407
2102.35
650
310.08
80.11
38.2163
0.0025
0.0012
0.0005
0.0002
0.033
0.0157
0.009
0.0043
0.011
0.0052
0.0025
0.0012
Machine Specialties
P070/01
0.00533
5,330
0.086
0.0038
0.411
0.0183
0.037
0.0016
0.0025
0.0001
0.007
0.0003
Parker Metal
P028/01
0.0055
5,500
0.001
0.0000
0.013
0.0006
0.09
0.0041
0.0025
0.0001
0.005
0.0002
Piedmont PlatingP075/01
0.021
21,000
0.001
0.0002
0.012
0.0021
0.1
0.0175
0.0025
0.0004
0.011
0.0019
Precision Fabrics
P011/01
0.132893
132,893
530
587.41
76
84.23
9
9.9749
0.0005
0.0006
0.0025
0.0028
0.023
0.0255
0.014
0.0155
0.009
0.0100
Precor
P076/01
0.007378
7,378
0.001
0.0001
0.009
0.0006
0.034
0.0021
0.0025
0.0002
0.005
0.0003
Procter & Gamble SwingP005/01
0.0854
85,400
4470
3183.69
846
602.55
0.75
0.5342
0.0025
0.0018
0.0005
0.0004
0.011
0.0078
0.009
0.0064
0.015
0.0107
0.0025
0.0018
Procter & Gamble BS-01
P031/01
0.325156
325,156
1489
4037.87
977
2649.43
0.1
0.2712
0.005
0.0136
0.0005
0.0014
0.0025
0.0068
0.01
0.0271
0.005
0.0136
0.0025
0.0068
Procter & Gamble BS-02
P031/02
0.05105
51,050
289
123.04
92
39.17
3.41
1.4518
0.005
0.0021
0.0005
0.0002
0.0025
0.0011
0.0025
0.0011
0.005
0.0021
0.0025
0.0011
Qorvo
P073/01
0.127515
127.515
0.244
0.2595
0.003
0.0032
0.0025
0,0027
0.16
0.1702
0.0025
0.0027
0.005
0.0053
Qualica s
P055/01
0.0462
46.200
229
88.24
67
25.82
0.59
0.2273
0.005
0.0019
0.0005
0.0002
0.0025
0.0010
0.09
0.0347
0.0025
0.0010
0.0025
0.0010
Shamrock Environ. BS-01
P065-01
0.18495
184,950
5646
8708.86
103
158.88
74.5
114.9150
0.005
0.0077
0.002
0.0031
0.01
0.0154
0.13
0.2005
0.3
0.4627
0.05
0.0771
0.0001
0.00015
Shamrock Environ. BS-02
P065-02
0.08915
89,150
3646
2710.84
1643
1221.59
138
102.6045
0.0025
0.0019
0.0014
0.0010
0.043
0.0320
0.098]065
0.124
0.0922
0.0102
0.0076
Shamrock Environ. Patton
P068/01
0.0288
28,800
638
153.24
530
127.30
1.46
0.3507
0.007
0.0017
0.0015
0.0004
0.024
0.0058
0.157
0.059
0.0142
0.076
0.0183
Solenis
P074/01
0.0356
35,600
1675
497.31
525
155.87
9.53
2.8295
0.0075
0.0022
0.001
0.0003
0.023
0.0068
0.016
0.027
0.0080
0.007
0.0021
Triad AnodizingI
P029/01
0.00141
1,410
0.001
0.0000
0.018
0.0002
0.088
0.0025
0.0000
0.024
0.0003
Triad AnodizingII
P029/02
0.00192
1,920
0.001
0.0000
0.013
0.0002
0.091
0.0025
0.0000
0.019
0.0003
United Metal
P040/01
0.00586
5,860
0.001
0.0000
0.063
0.0031
0.088
0.006
0.0003
0.005
0.0002
Vertellus
P002/01
0.0917
91,700
7250
5544.64
707
540.70
75.47
57.7178
0.005
0.0038
0.002
0.0015
0.113
0.0864
0.085
0.0025
0.0019
0.017
0.0130
Zink HoldingP043/01
0.0893
89,300
20
14.90
21
15.64
0.17
0.1266
0.005
0.0037
0.0005
0.0004
0.0025
0.0019
0.021
0.0025
0.0019
0.0025
0.0019
Sum of Industrial Loading (Ibs/day) =>
Avg Influent loading (Ibs/day) =>
2 00988
2098806
35,361.1510
m /I Ibs/da
8,604.4905
m /I Ibs/da
377.1720
m /I Ibs/da
0.3093
m /I Ibs/da
0.0211
m /I Ibs/da
1.1714
m /I Ibs/da
m /I Ibs/da
0.6589
m /I lbs/day
0.1858
m /I Ibs/da
0.00015
m /I Ibs/da
m /I
MGD gal/da
32,605,000
811 :1 4
81577.71
5471.14511
0.00451
1.2237
0.000541
0.14681
0.019881
5.4059
0.090981
24.73981
0.0081
2.17541
0.003851
1.04691
0.000051
0.01360
Uncontrollable Load from Mass Bal (Ibs/day) =>
Uncontrollable Concen. from Mass Bal (mg/L) =>
Uncont. from Uncont. Sampling (mg/L & Ibs/day) =>
Uncontrollable Concen. From Literature (mg/L) =>
Uncontrollable conc. to be used in HWA (mg/L) =>
48,663.8903 72,973 2195 5,093.9730 0.9144 0.12581 1 23.64561 F 1.5165 F 0.8611 0.01344
0.00361
1 0.00051
1 0.01661
1 0.09291
1 0.00601
1 0.00341
LU6601
2591 65895.211 3941 100242.13 22.16
5637.98
-0.00251
0.6361F
0.0005
0.12721
0.00251
0.6361
0.0609
15.4943 0.0025
0.63611
0.00261
0.6615 0.0003 0.0763
250 1 2501 1 25 0.003
0.003
1 0.051
1 0.061
1 0.0411
1 0.049
1 0.0003
_
0.0025
0.0005
0.0609
0.0082
0.0033
0.00005 1�,
meg20192018 HWA TZO Uncontrollable Mass Balance SS FF.xls
SIU.Uncont. Mass. Bal
Page 1 of 2 pages
3/22/2019, 1:47 PM
Revision: August 1999

a- SIU.Uncont. Mass. Bal
2019V
HWA
IUP
Count
1
2
4
5
6
7
8
9
10
11
13
14
15
16
17
18
19
20
21
22
23
25
26
27
28
29
30
31
32
33
34
35
36
37
MMMOMIN MMMMMIMMMEN
INDUSTRY Industry
NAMES Permit/Pipe
(please list alphabetically) number
FLOW DENUM
Average Discharge pischargelAverage
NICKEL
Discharge
SELENIUM
Average Discharge
SILVER
Average Discharge
ZINC
Average Discharge
Oil & Grease
Average Discharge
Average Discharge
Load
MGD gal/dayIbs/da
Conc. Load
m /I Ibs/da
Conc. Load
m /I Ibs/da
Conc. Load
m /I Ibs/da
Conc. Load
m /I Ibs/da
Conc. Load
m /1 Ibs/da
Conc. Load
m /I Ibs/da
Aramark
P051/01
0.103244
103,244
0.04
0.03441
0.00251
0.0022
0.0025
0.0022
0.57
0.4908
4.12
3.5475
Chemol
P049/01
0.032376
32,376
3.56
0.9612
0.00251
0.0007
0.0025
0.0007
0.38
0.1026
44.77
12.0885
Elastic Fabrics of America
P003/01
0.307171
307,171
0.0025
0.0064
0.006
0.0154
0.015
0.0384
0.021
0.0538
3.67
9.4018
Evonik I
P021/01
0.014181
14,181
0.01
0.0012
0.01
0.0012
0.0025
0.0003
0.44
0.0520
2.65
0.3134
Evonik II
P021/02
0.063243
63,243
0.017
0.0090
0.017
0.0090
0.017
0.0090
0.277
0.1461
1.5
0.7912
Express Container Services
P069/01
0.0225
22,500
0.056
0.0105
0.0025
0.0005
0.0025
0.0005
0.033
0.0062
6.11
1.1465
0.584
0.1096
Gilbarco total all pipes)
P033/01-04
0.01329
13,290
0.007
0.0008
0.005
0.0006
0.0025
0.0003
0.282
0.0313
Greensboro Ind. Platers I
P020,/01
0.00282
2,820
3.65
0.0858
0.005
0.0001
0.0025
0.0001
0.817
0.0192
Greensboro Ind. Platers 11
P020/02
0.004647
41647
6.76
0.2620
0.005
0.0002
0.0025
0.0001
69.39
2.6893
HAECO Timco 1
P048/01
0.000653
653
0.015
0.0001
0.005
0.0000
0.0025
0.0000
0.14
0.0008
Imperial Tobacco Group
P004/01
0.14026
140,260
0.0025
0.0029
0.0025
0.0029
0.0025
0.0029
0.061
0.0714
5.48
6.4103
IQE
P077/01
0.00111
1,110
0.018
0.0002
0.005
0.0000
0.0025
0.0000
0.031
0.0003
Lanxess
P025/01
0.0572
57,200
0.022
0.0105
0.1871
0.0892
0.0025
0.0012
0.383
0.1827
6.9
3.2916
Machine Specialties
P070/01
0.00533
5,330
0.075
0.0033
0.0171
0.0008
0.0025
0.0001
0.039
0.0017
Parker Metal
P028/01
0.0055
5,500
0.005
0.0002
0.005
0.0002
0.0025
0.0001
14
0.6422
Piedmont Plating
P075/01
0.021
21,000
0.386
0.0676
0.005
0.0009
0.0025
0.0004
0.904
0.1583
Precision Fabrics
P011/01
0.132893
132,893
0.0025
0.0028
0.0025
0.0028
0.0025
0.0028
0.122
0.1352
21.2
23.4965
Precor
P076/01
0.007378
7,378
0.02
0.0012
0.005
0.0003
0.0025
0.0002
0.106
0.0065
Procter & Gamble Swing
P005/01
0.0854
85,400
0.007
0.0050
0.0025
0.0018
0.0025
0.0018
0.019
0.0135
10.42
7.4215
Procter & Gamble BS-01
P031/01
0.325156
325.156
0.005
0.0136
0.00251
0.0068
0.0025
0.0068
3.25
8.8134
51
138.3019
Procter & Gamble BS-02
P031;02
0.05105
51,050
0.0025
0.0011
0.0025
0.0011
0.0025
0.0011
2.306
0.9818
0.55
0.2342
Qorvo
P073/01
0.127515
127,515
0.005
0.0053
0.005
0.0053
0.0025
0.0027
0.035
0.0372
Qualica s
P055/01
0.0462
46.200
0.0025
0.0010
0.005
0.0019
0.0025
0.0010
0.04
0.0154
2.76
1.0635
Shamrock Environ. BS-01
P065-01
0.18495
184,950
0.17
0.2622
0.009
0.0139
0.0025
0.0039
0.64
0.9872
4.69
7.2342
Shamrock Environ. BS-02
P065-02
0.08915
89,150
0.202
0.1502
0.007
0.0052
0.0025
0.0019
1.51
1.1227
61.65
45.8375
Shamrock Environ. Patton
P068/01
0.0288
28,800
0.465
0.1117
0.0025
0.0006
0.0025
0.0006
0.283
0.0680
6.51
1.5612
2.66
0.6389
Solenis
P074/01
0.0356
35,600
0.014
0.0042
0.0091
0.0027
0.0025
0.0007
0.41
0.1217
1
1.12
0.3325
Triad Anodizing I
P029/01
0.00141
11410
0.015
0.0002
0.0051
0.0001
0.0025
0.0000
0.18
0.0021
Triad Anodizing II
P029/02
0.00192
1,920
0.037
0.0006
0.0051
0.0001
0.0025
0.0000
0.717
0.0115
United Metal
P040/01
0.00586
5,860
0.052
0.0025
0.0051
0.0002
0.0025
0.00011
0.454
0.0222
Vertellus
P002/01
0.0917
91,700
0.088
0.0673
0.007
0.0054
0.0025
0.00191
0.316
0.2417
3.85
2.9444
Zink Holding
P043/01
0.0893
89,300
0.0025
0.0019
0.0025
0.0019
0.0025
0.0019
0.035
0.0261
0.468
0.3485
Sum of Industrial Loading (Ibs/day) _>
Avg Influent loading (Ibs/day) _>
2.0988
20988061
2.0868
m2/L Ibs/da
0.1737
m /I Ibs/da
0.0834
m /I Ibs/da
17.2548
m /I Ibs/da
2.7078
m /I Ibs/da
263.8076
m /I Ibs/da
MGDgal/day
Ibs/da
32,605,000
0.04
10.8770
0.0034
0.9245
0.0025
0.6798
0.346
94.0863
1,832.7792
Uncontrollable Load from Mass Bal (Ibs/day) _>
Uncontrollable Concen. from Mass Bal (mg/L) _>
Uncont. from Uncont. Sampling (mg/L & Ibs/day) _>
Uncontrollable Concen. From Literature (mg/L) _>
Uncontrollable conc. to be used in HWA (mg1L) _>
meg20192018 HWA TZO Uncontrollable Mass Balance SS FF.xls
SIU. Uncont. Mass. Bal
Page 2 of 2 pages
3/22/2019, 1 A7 PM
Revision: August 1999
8.7902 0.7509 0.5964 76.8315 #VALU> !1 1.568.9716
0.03451 1 0.00301 1 0.00231 1 0.30201 14VALUE!
0.008 2.0354 0.0025 0.6361 0.0025 0.63611 0.52771134.25831 28 1597.7680
0.0211 0. 1 0.175 1 50
0.021 0.0029 0.0023 0.2972