NC0021709_Pretreatment Review of Headworks Analysis_20171204

Water Resources
Environmental Quality
Mr. Tim Church
Water Resources Director
Town of Jefferson
P.O. Box 67
Jefferson, NC 28640
December 4, 2017
Subject: Pretreatment Review of Headworks Analysis (HWA)
Town of Jefferson
NPDES Permit No. NCO021709
Ashe County
Dear Mr. Church:
COOPER
Governor
MICHAEL S. REGAN
Secretary
LINDA CULPEPPER
Intenm A?ector
The Pretreatment, Emergency Response, and Collection Systems (PERCS) Unit of the Division of Water
Resources has reviewed the Headworks Analysis (HWA) for the Town of Jefferson. The HWA was
submitted by McGill Associates, Town's consultant, was received by the Division initially on May 5, 2017,
followed by revisions received on November 2, 2017.
The Division concurs with the HWA calculations for all pollutants of concern, with the observations
discussed below. These approved Maximum Allowable Headworks Loadings (MAHLs), Maximum
Allowable Industrial Loadings (MAILs), and the basis for these values are found on the last page of the
enclosed HWA spreadsheet. The results of the HWA are also listed in the bottom section of the enclosed
Allocation Table.
1. Low Level Mercury: While reviewing mercury effluent sampling data for several DMR and STMP,
we noticed that lab did not follow consistently low-level method 1631, detection level 1 ng/l, as
listed in the current Division approved STMP. The POTW must follow-up with the lab to make
sure all DMR and STMP mercury effluent samplings be done using method 1631.
2. Removal Rates: We noticed several effluent data within the HWA period did not meet the STMP
detection levels (DLs). We also noticed DLs were not consistent throughout the DMR/STMP data.
The Lab must be instructed to follow the Division approved STMP DLs criteria to report on DMR
and STMP.
Cyanide Over Allocation: Cyanide is overallocated based on NPDES loadings. We are approving
HWA this time with cyanide overallocation since POTW is not having any NPDES cyanide
noncompliance. We will revisit this issue in the next HWA. In the meantime, POTW may review
IUP limit to resolve cyanide overallocation.
4. HWA Due Date: The HWA approved today is primarily based on DMR/STMP data for the period
of January through December 2016. Unless conditions at the POTW change significantly and thus
warrant an earlier submittal (see Comprehensive Guide, Section 8), the POTW must submit the
followings: Nothing Compares:_
State of North Carolina I Environmental Quality
1611 Mail Service Center I Raleigh, North Carolina 27699-1611
919-707-9000

1. Updated STMP due by May 1, 2018, based on NPDES permit renewal.
2. HWA due by April 1, 2022.
Thank you for your continued cooperation with the Pretreatment Program. If you have any questions or
comments, please contact Monti Hassan at [phone] [email• Monti. Hassan@ncdenr gov] or
Deborah Gore, Unit Supervisor at [phone] [email: [e-mail]].
i cerely,
Monti Hassan
Division of Water Resources
MH/Jefferson HWA 2017
Enclosures HWA.AT spreadsheets
CC with enclosures
Monti Hassan, PERCS Unit
CC without enclosures
Jim Gonsiewski, WSRO
Central Files

Workbook Name: Jefferson. HWA.AT.2017.Approved.x1s; Worksheet Name: HWA Printed 12/4/2017,448 PM
A B
C
D
E F G H I J K
1 Headworks Analysts Spreadsheet
Spreadsheet Instructions
2 POTW Name Jefferson WWTP
1) Applicable Values should be entered in the Heavy Bordered Blue cells The rest of worksheet is
3 Date
12/4/2017
protected, password is "2"
2) Additional pollutants can be added in cells A34 to A42 Note all Pollutant names are linked from
4 POTW NPDES # _>
NC0021709
here to other pages in HWA worksheet and also to AT worksheet (i e , automatically entered into
5 POTW Sludge Permit # =>
W 0022155
Class A
other pages in HWA worksheet and also AT worksheet from HWA worksheet)
6 POTW Sludge Permit # =>
W0004166
Class B
3) Formulas are discussed in the Comprehensive Guidance HWA Chapter
4) HWA, AT and HASL worksheets are linked MAHLs, Basis, and Uncontrollable load are
8 POTW NPDES Permitted Flow(MGD)=
06
<= ed to AT only
automatically entered into AT from this worksheet
9 POTW Average Flow(MGD)=
0 211
< asedmHWA calculations 5) If red tab notes are not visible, they can be turned on in the "Tools" menu under "options", in the
10 Uncontrollable Flow(MGD)=
02056
"view" tab click the "comment indicator only" button
11 7QI0 Stream Flow(MGD)=
14219
12 Stream Classification =
C+
14 Class of Sludge generated (A, or B) A
15 Sludge to Digester Flow(MGD)=
16 Sludge to Disposal Flow(MGD)=
0002704
17 %Solids to Disposal=
P
1 4
mpur m
Through talc for different POTW
use Design
s
18 Sludge Site Area(acres)=
43
flows
Criteria
19 Sludge Site Life(yrs)=
Design Values Average Flow Perimtted Flow
20 Age of Sludge Site(yrs)=
W WTF Influent BOD (mg/1) 200 231 1 811 x
21
W WTF Influent TSS (mg/1) 280 9260 3250 x
22
W WTF Influent NH3 (in g/1) 15 1 2159 758 x
23
W WTF Influent Total N(mg/1) 40
24 Pass -Through Loading Calculations
W WTF Influent Total P (mg/1)
Stream Standard Pass -Thio
NPDES LIMIT
Plant Removal
Removal rate
NPDES Loading Standard Stream Loading Design Criteria Loading Minimum Pass
26 Pollutant (mg/1)
Rate (%)
Source
(lbs/day) (mg/1) Standard Source Obs/day) Loading (lbs/day) Obs/day) Thru Basis
27 BOD 5
9784
DMR Data
406 1,001 1,001 Design
28 TSS 20
97 84
DMR Data
1,626 1,401 1,401 Design
29 Ammonia 2
99 07
DMR effluent -STI.
379 75 75 Design
30 Arsenic
4500
Literature
0 025 NC 15A NCAC 06189 06189 Stream Std
31 Cadmium 00034
6700
Literature
00181 NC 15A NCAC 00181 NPDES
32 Chromium
8200
Literature
0 025 NC 15A NCAC 1 8909 18909 Stream Std
33 Copper
8954
Site Specific-
NC 15A NCAC
34 Cyanide 00084
5891
Site Specific
00359 NC 15A NCAC 0 0359 NPDES
35 Lead 00421
6100
Literature
0 1896 NC 15A NCAC 0 1896 NPDES
36 Mercury 000004
6000
11,iterature
000018 NC/ EPA 4/22/S 0 00018 NPDES
37 lMolybdenum
3300
Literature
38 Nickel
4200
Literature
0 044 NC/ EPA 4/22/S 10328 10328 Stream Std
39 Selenium
5000
Literature
00025 NC 15A NCAC 00691 0 0681 Stream Std
40 Silver
7500
Literature
NC 15A NCAC
41 Zinc
5707
Site Specific
NC 15A NCAC
42 Total Nitrogen
200 16
43 Total Phos
44 in
45 it
46 e
47 f
48 I,
49 li
50 1
Modeled after Chapter 5-HWA Guidance, Appendix 5-A
Revision Date February 2008

Workbook Name: Jefferson.HWA.AT.2017.A roved.xls• Worksht NHWA Page 2of5
pp � eeame: Pnnted 12/4/2017, 4 48 PM
A
B
C
D E
I F
G I
H I
J K
52
53
54 Inhibition Loading Calculations
Average Influent NH3 (mg1l)
Average Anaerobic Digester NH3 (mg/1)
only enter when have ANAEROBIC digester
55 Pollutant
Primary
Removal Rate
(%)
Primary
Removal Rate
Source
A.SJNit)T F. A.SJNiy/T F
Inhibition Inhibition
Concentration Concentration
(mg/1) Source
A.SJNit lT F
Inhibition
Loading
Obs/day)
Digester
Inhibition
Concentration
(mgtl)
Digester
Inhibition Digester Inhibition
Cone. Source Loading (Ibs/day)
Mrmmum Minimum
Inhibition Inhibition
Loading Loading
abs/day) Source
56 BOD
57 TSS
58 Ammonia
480 Literature
8429689
842 97 AS/Nit/TF mh
59 Arsenic
01 Literature
0175
0 1756 AS/NWTF inh
60 Cadmium
I Literature
17562
17562 AS/Nit/TF inh
61 Chromium
0 394 Literature
0691
0 6919 AS/Nit/TF Th
62 Copper
048 Literature
08430
0 8430 AS/Nil/TF tah
63 Cyanide
01 Literature
0 1756
0 1756 AS/Nil/TF mh
64 Lead
05 Literature
08781
0 8781 AS/Nit/TF inh
65 Mercury
01 Literature
0 1756
0 1756 AS/Nit/TF inh
66 Molybdenum
67 Nickel
025 Literature
04390
0 4390 AS/Nit/rF mh
68 Selenium
69 Silver
025 Literature
04390
0 4390 AS/Nit/TF
/U JZinc
I Literature
17562
17562 AS/Nil/TF mh
71 Total Nitrogen
72 Total Phos
73 c
74 d
75 e
76 f
77 ig
78 Ih
17911
Modeled after Chapter 5-HWA Guidance, Appendix 5-A
Revision Date February 2008

Workbook Name: Jefferson. HWA.AT.2017.Approved.xls; Worksheet Name: HWA Printed 12/4/2017a4e48 PM
A
B
C
D
E
F
G
H
I
J K
80
81 Sludge Loading Calculations
82 Pollutant
Sludge Ceding
Concentration
Limit (mg/kg)
Sludge Ceiling
Load
Obs/day)
Sludge Ceiling
Load
- HASL Calc. -
(lbs/day)
Cumulative Sludge
Rate Limit
(lbs/(acre•hfe))
Cumulative
Sludge Loading
Obs/day)
Class A Limits
Monthly
Average Rate
Limit (mg/kg)
Class A Limits
Monthly Avg
Loading
Obs/day)
Class A Limits
Mon. Avg Load
HASL Calc -
(lbs/day)
Minimum
Sludge Mi mnum
Loading Sludge
Obs/day) Loading Sorce
83 IBOD
84 TSS
85 Ammonia
86 Arsenic
75
005261
36
41
00526 Sludge Ceilm
87 Cadmium
85
00400
34
39
00400 Sludge Ceilm
88 Chromium
89 Copper
4300
15160
1338
1500
15160 Sludge Ceilm
90 Cyanide
91 ILead
840
04347
267
300
04347 Sludge Ceilm
92 Mercury
57
00300
15
17
00300 Sludge Ceding
93 Molybdenum
75
00717
00717 Sludge Ceilm
94 Nickel
420
03157
374
420
03157 Sludge Ceilm
95 Selenium
100
00631
89
100
00631 Sludge Ceilm
96 Silver
97 Zinc
7500
41490
2498
2800
41490 Sludge Ceilingi
98 Total Nitrogen
99 1 Total Phos
100 c
101 it
102 e
103 f
104
105 h
1061
107
Modeled after Chapter 5-HWA Guidance, Appendix 5-A
Revision Date February 2008

E
Workbook Name: Jefferson. HWA.AT.2017.A roved.xls; Worksheet Name: HWA Page4of5
pp Printed 1214/2017, 448 PM
A
I B I C I
D E
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H 1 J K
108 Maximum Allowable Headworks Loading Calculations
Minimum Pass Minimum Minimum Minimum Minimum
Through Loading Pass Through Inhibition Loading Inhibition Loading Sludge Loading Sludge Loading
109 Obs/da) Source Obs/day) Source Obs/da) Sorce
Allowable
Headworks Maximum Allowable
Loading Obs/da) Headworks LoadingSource
110 BOD 10008 Desi
1000 8 Design
111 TSS 1401 1 Desi
1401 1 Design
112 Ammonia 75 1 Desi 842 9689 AS/Nit/TF mhibih
75 1 Design
113 Arsenic 06189 Stream Std 01756 AS/NiUrF inhibin 00526 Sludge Ceiling
0 0526 1 Sludge Ceiling
114 Cadmium 00181 NPDES 17562 AS/NiVPF mhibtb 00400 Sludge Ceiling
0 0181 NPDES
115 Chromium 18909 Stream Std 06919 AS/NiVTF mhibih
06919 AS/Nu/FF inhibition
6 Copper 0 8430 AS/NitrrF mlubib 15160 Sludge Ceiling
0 8430 AS/NurrF inhibition
.L1
7 Cyanide 0 0359 NPDES 0 1756 AS/NiVrF mhubm
0 0359 NPDES
.L1
118 Lead 0 1896 NPDES 0 8781 AS/NitlrF mlubrti 04347 Sludge Ceiling
0 1896 NPDES
119fMercury 0 00018 NPDES 01756 AS/Nu/rF mhibih 00300 Sludge Ceiling
000018 NPDES
120 Molybdenum 00717 Sludge Ceiling
00717 Sludge Ceiling
121 Nickel 10328 Stream Std 0 4390 AS/Nd/TF mhibih 03157 Sludge Ceiling
03157 Sludge Ceiling
122 Selenium 0 0681 Stream Std 00631 Sludge Ceiling
00631 Sludge Ceiling
123 Silver 04390 AS/Nit/TF mhibiti
04390 AS/NnlPF inhibition
124 Zinc 17562 AS/Nit(rF inhibin 41490 Sludge CeilmF
17562 AS/NiUTF inhibition
125 Total Nitrogen
_
126 Toinl Plus
1271c
128 d
129 e
130 f
131
132 h
1331
134
Modeled after Chapter 5-HWA Guidance, Appendix 5-A
Revision Date February 2008

Page 5 of 5
Workbook Name: Jefferson. HWA.AT.2017.Approved.xls; Worksheet Name: HWA Printed 12/4/2017, 448 PM
A
B C
D
E F
G
H I J K
135
136 Maximum Allowable Industrial Loadings Calculations
Design vs Pass -
Thru Warning
Maximum
Allowable Check to Use Uncontrollable
Headworks HASL Cates Concentration Uncontrollable Uncontrollable
137 Pollutant Loading (lbs/day) MAHL Basis (x) (mg/1) Source Load (lbs/day)
Maximum
Allowable
Industrial
Load Obs/day)
138 BOD 1000 8000 Design 141 Mass Balance 2417645
7590355
139 TSS 1401 1200 Design 12788 Mass Balance 2192509
1181 8692
140 Ammonia 750600 Design 1278 Mass Balance 219084
53 1516
141 Arsenic 00526 Sludge Ceiling 00084 Mass Balance 001441
00382
142 Cadmium 00181 NPDES 0 003 Mass Balance 00051
00130
143 Chromium 0 6919 AS/NtVtF inlubitil N/A 000081 Mass Balance 00014
06905
144 Copper 0 8430 AS/NrVfF inhibition 003650 Mass Balance 00626
07804
145 Cyanide 00359 NPDES N/A 000925 Mass Balance 00159
00200
146 Lead 0 1896 NPDES 000500 Mass Balance 00086
0 1810
147 Mercury 000019 NPDES 0000050 Mass Balance 000009
000009
148 Molybdenum 00717 Sludge Ceiling 0000500 Mass Balance 00009
00709
149 Nickel 03157 Sludge Ceiling 0000831 Mass Balance 00014
03143
150 Selenium 00631 Sludge Ceding 0005000 Mass Balance 00086
00546
151 Silver 04390 AS/Nrt/fF udubrh N/A 0000500 Mass Balance 00009
04382
152 Zmc 17562 AS/Nit/TF inhibition 0356027 Mass Balance 06104
1 1458
153 Total Nitrogen
154 Total Phos
155 c
156 d
157 e
158 f
1159.g
11601h
116111
Modeled after Chapter 5-HWA Guidance, Appendix 5-A
Revision Date February 2008

Workbook Name: Jefferson. HWA.AT.2017.Approved.xls, Worksheet Name: AT
Allocation Table
Headworks last approved
12/04/17
Allocation Table updated
12/04/17
Permits last modified
08/01/17
NCO021709
IUP INDUSTRY NAMES
Count (Pie= m, alitam,ory)
1 Amencan Emergency Vehicles
3
4
5
6
7
8
9
10
Spreadsheet Instructions
1) Applicable Values should be entered in the Heavy Bordered cells Rest of worksheet is protected, password
is "2"
2) Formulas are discussed in the Comprehensive Guidance, Chapter 6, Section C
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
n columns AT through BK
IndustryI Type Renewal Modification Date
Permit Pipe of Effective Effective Permit
number number Industry Date Date Exnire,,
Column Totals =>
Basis=>
MARL from HWA (lbs/day) =>
Uncontrollable Loading (lbs/day) _>
Total Allowable for Industry (MAIL) (lbs/day) _>
Total Permitted to Industry (lbs/day) =>
MAIL left (lbs/day) =>
Percent Allow Ind (MAIL) still available
Percent MAHL still available
5 Percent MAHL (lbs/dav) =>
' HWA AT
Revised November 2005
Pnnted 12/4/2017, 4 48 PM
Page 1 of 4
Permit Limits Permit Limits Permit Limits Permit Limits
Conc Load Conc Load Conc Load
MGD eal/dav me/1 lbs/dme/l lbs/day ing/1 lbs/da
171 1 13
NPDFS uesign uesign uesign
NPDES Permitted Flow--> 06000 1001 1401 7506
02056 242 219 2191
03944 759 1182 53 15
00050 17 13 000
03894 742 1169 53 15
987% 978% 989% 1000%
649% 742% 835% 708%

Workbook Name: Jefferson. HWA.AT.2017.Approved.xls, Worksheet Name: AT
Allocation Table
Headworks last approved 12/04/17
Allocation Table updated12/04/17
Permits last modified08/01/17
NCO021
HWA AT
Revised November 2005
Printed 12/4/2017, 4 48 PM
Page 2 of 4
Industry
Permit Limits
Permit Limits
Permit Limits
Permit Limits
IUP
INDUSTRY NAMES Permit
Pipe
Conc Load
Conc Load
Conc Load
Conc Load
Count
cp�..61.klbd+y> number
number
mgA lbs/dav
mgA lbs/da
m lbs/da
m lbs/da
1
American Emergency Vehicles 0004
0001
00700 00029
17100 00713
20700 00863
3
4
5
6
7
8
9
10
Column Totals =>
00000
00029
00713.
00863
Sludge
AS/NdfrF
AS/Nit/rF
Basis=>
Ceiling
NPDES
inhibition
inhibition
MARL, from HWA (lbs/day) =>
00526
00181
06919
08430
Uncontrollable Loading (lbs/day) =>
00144
00051
00014
00626
Total Allowable for Industry (MAIL) (lbs/day) =>
00382
00130
06905
07804
Total Permitted to Industry (lbs/day) =>
00000
00029
00713
0 0863
MAIL left (lbs/day) =>
00382
00100
0 6192
06941
Percent Allow Ind (MAIL) still available (%) _>
1000%,
1 775%,
897%
88 9%
Percent MAHL still available (%) _>
727%
554%
1 89 5 %
82 3
5 Percent MAHL (lbs/dav) =>
00026
0 0009
0 0346
0 0421
HWA AT
Revised November 2005
Printed 12/4/2017, 4 48 PM
Page 2 of 4

Workbook Name: Jefferson. HWA.AT.2017.Approved.xls, Worksheet Name: AT
Allocation Table
Headworks last approved 12/04/17
Allocation Table updated 1 12/04/17
Permits last modified 1 08/01/17
NCO021
' HWA AT
Revised November 2005
Printed 12/4/2017, 4 48 PM
Page 3 of 4
Industry
Permit Limits
Permit Limits
Permit Limits
Permit Limits
Permit Limits
IUP
INDUSTRY NAMES Permit
Pipe Cone Load
Conc Load
Conc Load
Cone Load
Conc Load
Count
(G>awWtalphabcWy) number
number m lbs/dav
meA lbs/da
m lbs/dav
mgfl lbs/dav
MPA lbs/da
1
American Emergency Vehicles 0004
0001 06500 00271
043001 00179
23800 00992.
3
4
5
6
7
8
9
10
Column Totals =>
00271
1 0017
0000000.
00000
00992
Sludge
Sludge
Basis=>
NPDES
NPDES
NPDES
Ceiling
Ceiling
MAHL from HWA (lbs/day) =>
00359
0 1896
0000176
00717
03157
Uncontrollable Loading (lbs/day) =>
00159
00086
0000 8
00009
00014
Total Allowable for Industry (MAIL) (lbs/day) _>
00200
01810
0000090
00709
03143
Total Permitted to Industry (lbs/day) =>
00271
00179
0000000
00000
00992
MAIL left (lbs/day) =>
-00071
0 1631
0000090
00709
0 2150
Percent Allow Ind (MAIL) still available (%) _>
1 -35 2 %1
1 901%]
1 1000%1
100 0 %
68 4 0
Percent MAHL still available (%) =>
-197%
860%
512%
98 8 %
68 1 0
5 Percent MAHL (lbs/dav) _>
1 00018
00095
1 0000009
0 0036
0 0158
' HWA AT
Revised November 2005
Printed 12/4/2017, 4 48 PM
Page 3 of 4

Workbook Name: Jefferson. HWA.AT.2017.Approved.xls, Worksheet Name: AT
Allocation Table
Industry
Headworks last approved
12/04/17
Allocation Table updated
12/04/17
Permits last modified
1 08/01/17
HWA AT
Revised November 2005
Printed 12/4/2017, 4 48 PM
Page 4 of 4
Industry
Permit Limits
Permit Limits
Permit Limits
IUP
INDUSTRY NAMES Permit
Pipe
Cone Load
Cone Load
Cone Load
Count
(P1—hsta1pn W.1y) number
number
m lbs/dav
mm lbs/day
mgfI lbs/da
I
American Emergency Vehicles 0004
0001
024001 00100
148001 0 0617
3
4
5
6
7
8
9
10
Column Totals =>
00000
00100,
0 0617
Sludge
AS/Nit/rF
AS/Nitf rF
Basis=>
Ceiling
inhibition
inhibition
MAHL from HWA (lbs/day) =>
00631
04390
1 7562
Uncontrollable Loading (lbs/day) =>
00086
00009
06104
Total Allowable for Industry (MAIL) (lbs/day) =>
00546
04382
1 1458
Total Permitted to Industry (lbs/day) =>
00000
00100
00617
MAIL left (lbs/day) =>
00546
04282.
1 0841
PciLeut Allow Ind (IVIAIL) still available (%) _>
1000%,
977%,
946%
Percent MAHL still available (%) _>
864%
975%
k6UH
5 Percent MAHL (lbs/dav) =>
0 0032
0 0220
0 087R
HWA AT
Revised November 2005
Printed 12/4/2017, 4 48 PM
Page 4 of 4