NC0064050_Headworks Analysis_20220711

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WATER RESOURCES DEPARTMENT
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RECEIVED
June 29, 2022 J U L 01 2022
NCDEQIDWRINPDES
NC-DEQ, DWR, Municipal Unit
1617 Mail Service Center
Raleigh,NC 27699-1617
Subject: Town of Apex Headworks Analysis and LTMP submittal
Dear Municipal Unit:
Enclosed is the Town of Apex HWA submitted for approval in accordance with NCAC 2H.900
regulatory requirements. The HWA calculations are based on our NPDES permit NC0064050.
Also enclosed is the updated Long Term Monitoring Plan. The Town of Apex requested a
permit modification of reduced monitoring for BOD, TSS,Ammonia and Fecal Coliform. The
modification was approved and put into effect on May 1, 2022 and will expire April 30, 2026.
In August 2014 the Towns of Apex and Cary opened the jointly owned Western Wake Regional
WRF. In October 2014, the Town of Apex had diverted all wastewater emanating from
households and facilities in the Cape Fear River basin to the Western Wake Regional WRF. The
Town of Apex Pretreatment group regulates all users within the Town of Apex corporate limits.
The Town has no industrial permitted facilities discharging to the Western Wake Regional WRF.
The Apex WRF currently has two permitted industries, Tipper Tie I and Tipper Tie II.
Combined the permitted flows are 20,000 gallons per day, but discharges at each of the
industries averages about 10 times per month.
The Town of Apex Water Reclamation Facility hauls all of the sludge it produces to Western
Wake Regional WRF to be dried into class A biosolids which are then sold as fertilizer under the
name Enviro Gems.
In order to capture the current flows,pollutant and nutrient loading and sludge disposal at the
Town of Apex WRF,the data used in this HWA is from February 2019 through May 2022,
ensuring a representative data pool. Analysis and results for Tipper Tie II begins in June 2020
when production at the facility started and ends mid-December 2021 when production
temporarily shut down. Tipper Tie II has not yet restarted production as of the date this letter.
TOWN OF APEX
The Peak of Good Living
PO Box 25o Apex, NC 27502 I (919) 249-340o I www.apexnc.org

I have also updated the LTMP as requested and enclosed it for your review. The LTMP has been
updated to reflect the change from four sand filters to two disk filters. The 50.0 ug/L PQL for
molybdenum has been reduced to 10.0 ug/L and the nickel PQL of 10 ug/L has been reduced to
5.0 ug/L. Silver has been removed from the LTMP, as suggested in the permit modification
cover letter dated March 18, 2022.
If you have any question,please contact me at 919-249-3366 or [e-mail].
Sincerely,
Lori Avent
Town of Apex
Water Resources Specialist
Enclosures: Uncontrollable Data Summary
Aerobic Ditch Data Summary
Removal Rate Calculations
Mass Balance Spreadsheet
HWA Spreadsheets
Allocation Table
Documentation of Design Criteria
Letter of Explanation of Assumptions
Sludge Disposal and Analysis
LTMP updated June 2022
Tipper Tie Analysis Spreadsheets

Town of Apex Headworks Analysis
Explanation of Assumptions
The Town of Apex Water Reclamation Facility(NC0064050) is located in the Neuse
River Basin and discharges into an unnamed tributary of Middle Creek. The Town of
Apex partners with the Town of Cary at the Western Wake Regional WRF located in the
Cape Fear River Basin, which is operated by The Town of Cary. The Apex WRF serves
the Neuse River Basin area of the Town. Below are the sampling timeframes used in the
analysis:
• NPDES (DMR) and influent/effluent/ditch/uncontrollable LTMP sample data
from February 2019 through May 2022.
• Apex WRF currently has two SIU permits issued. Industrial monitoring sampling
for Tipper Tie I is from February 2019 through May 2022. Tipper Tie II began
discharging in June 2020 and stopped discharging in mid-December 2021, so
limited data is available. Tipper Tie II has not restarted production as of the date
of this letter. A critical piece of their manufacturing process broke and the item is
backordered for a significant amount of time due to the manufacturing shortages
and shipping delays that arose with the pandemic.
• Sludge sampling and hauling records for February 2019 to May 2022 were used
in this report for consistency. The sludge to disposal (MGD) and% solids to
disposal are based on the sludge analysis in this time frame.
The Total Nitrogen NPDES effluent limit of 3.7 mg/1 is derived from an annual mass
loading limit of 40,547 lbs/yr.
(40,547 lbs/yr)/(365 days/yr) =(111.09 lbs/day)/(8.34 x 3.6 MGD avg. flow)=3.7
mg/l.
The uncontrollable concentrations used in the headworks calculations for each parameter
were chosen on comparisons of mass balance, literature and actual sampling data
concentrations. A table for the reason for the choice of each parameter's concentration is
enclosed.
The Town of Apex discontinued to utilize land application for sludge disposal, as the last
land application of biosolids was May 2015. The land application permit(WQ0001060)
was rescinded in October 2018. We use Western Wake Regional WRF (co-owned by the
Towns of Apex and Cary) for drying the sludge to produce a class A fertilizer sold under
the name Enviro Gems. The Western Wake Regional WRF permit number is
WQ0029376. Apex has the capability of using South Cary WRF dryer as a backup.

In response to our recent HWA-AT and LTMP review letter from the DWR dated
6/13/22,the HWA was updated to use site-specific water quality standards (WQS) for
lead, molybdenum, nickel and zinc (Source: `RPA Input' Tab in the HWA Sheet). The
use of Design Criteria Loading for total nitrogen has been removed and replaced with the
NPDES TN loading value. The Allocation Table was updated to reflect the changes last
made in the Tipper Tie IUP. The %removal rate calculations follow Chapter 5, Section
E of the NC DEQ Comprehensive Guidance (If less than 50% of the pollutant data is
below the detection level, then use one-half the detection level as the data point value.)
Silver has been optionally hidden in the HWA's uncontrollable concentration section, and
the Allocation Table, following the POC definition in the NC DEQ Comprehensive
Guidance, Ch. 4 (See POC Tab in HWA-AT sheet). Silver is not a pollutant of concern
with the EPA or North Carolina, we do not have NPDES limits for silver, it is not
required by CFR 503 and there are no current SIU limits for silver with the Town of
Apex.

Workbook Name: HWAATDesign June 2022; Worksheet Name: HWA Pagelof5
Printed 6/29/2022,9:54 AM
A I B I C I D I E I F I G I H I I I J I K
1 Headworks Analysis Spreadsheet Spreadsheet Instructions:
2 POTW Name: Apex WRF 1) Applicable Values should be entered in the Heavy Bordered Blue cells. The rest of wor
3 Date: 6/24/2022 protected,password is"2".
4 POTW NPDES#=> NC0064050 2) Additional pollutants can be added in cells A34 to A42. Note all Pollutant names are lin
other pages in HWA worksheet and also to AT worksheet(i.e.,automatically entered into o
5 POTW Sludge Permit#_> WQ0029376 HWA worksheet and also AT worksheet from HWA worksheet).
6 HWA Analysis Period=> 2/2019-05/2022 3) Formulas are discussed in the Comprehensive Guidance HWA Chapter.
7 POTW NPDES Permitted Flow(MGD)= 3.6 <-used in AT only 4) HWA,AT and HASL worksheets are linked. MAHLs,Basis,and Uncontrollable load are
8 POTW Average Flow(MGD)= 1.248 mused in HWA calculations entered into AT from this worksheet.
9 Uncontrollable Flow(MGD)= 1.241 5)If red tab notes are not visible,they can be turned on in the"Tools"menu under"option
10 7Q10 Stream Flow(MGD)= 0 tab click the"comment indicator only"button.
11 Stream Classification= C-NSW
13 Class of Sludge generated(A,or B) A
14 Sludge to Digestor Flow(MGD)= NA Through calc.for different POTW use Design
8
15 Sludge to Disposal Flow(MGD)= 0.005717 flows Criteria
16 %Solids to Disposal= 3.48 Design Values Average Flow Permitted Flow Loading
17 Sludge Site Area(acres)= NA WWTF Influent BOD(mg/1) 250 1063.8 368.8 x
18 Sludge Site Life(yrs)= NA WWTF Influent TSS(mg/1) 350 5357.1 1857.1 x
19 Age of Sludge Site(yrs)= NA WWTF Influent NH3(mg/I) 40 357.1 123.8 x
20 WWTF Influent Total N(mgfl) ,l 45.6 15.8 01liciSereA
21 Pass-Through Loading Calculations WWTF Influent Total P(mg/I) r' j v„% 18.3 6.3 Weilkt
Stream Standard Pass-Thru
NPDES LIMIT Plant Removal Removal rate NPDES Loading Standard Stream Loading Design Criteria Loading Minimum Pass-Thru
23 Pollutant (mg/1) Rate(%) Source (lbs/day) (mg/I) Standard Source (lbs/day) Loading(lbs/day) (lbs/day) Basis
24 BOD 5 99.53 DMR 11,073 7,506 7,506 Design
25 TSS 30 99.44 DMR 55,759 10,508 10,508 Design
26 Ammonia 1 99.72 DMR 3,717 1,201 1,201 Design
27 Arsenic 45 Literature 0.01 Reasonable Po 0.1892 0.1892 Stream Std
28 Cadmium 67 Literature 0.0011 RPA Input 0.0347 0.0347 Stream Std
29 Chromium 82 Literature 0.011 RPA Input 0.6361 0.6361 Stream Std
30 Copper 91.2 LTMP 0.016 RPA Input 1.8924 1.8924 Stream Std
31 Cyanide 69 Literature 0.005 RPA Input 0.1679 0.1679 Stream Std
32 Lead 61 Literature 0.0078 RPA Input 0.2082 0.2082 Stream Std
33 Mercury 94.9 LTMP 0.000012 RPA Input 0.00243 0.00243 Stream Std
34 Molybdenum 33 Literature 2.000 RPA Input 31.0696 31.0696 Stream Std
35 Nickel 42 Literature 0.0779 RPA Input 1.3979 1.3979 Stream Std
36 Selenium 50 Literature 0.005 RPA Input - 0.1041 0.1041 Stream Std
37 Silver 75 Literature 0.00006 RPA Input 0.0025 0.0025 Stream Std
38 Zinc 54.25 LTMP 0.2656 RPA Input 6.0425 6.0425 Stream Std
39 Total Nitrogen 3.7 91.89 DMR 474.86 474.856 NPDES
40 Total Phos. _ 2 89.05 DMR 190.11 190.106 NPDES
Modeled after:Chapter 5-HWA Guidance,Appendix 5-A
Revision Date: February 2008

Page 2 of 5
Workbook Name: HWAATDesign June 2022; Worksheet Name: HWA Printed 6/29/2022,9:54AM
A I B I C I D I E I F I G I H I I I J I K
42 Average Influent NH;(mg/I) NA
43 Average Anaerobic Digester NH3(mg/1) NA
44 Inhibition Loading Calculations only enter when have ANAEROBIC digester
A.S./Nit,/T.F. A.S./Nit,/T.F. A.S./Nit,/T.F. Digestor Minimum
Primary Primary Inhibition Inhibition Inhibition Inhibition Digestor Inhibition
Removal Rate Removal Rate Concentration Concentration Loading Concentration Inhibition Digestor Inhibition Loading Minimum Inhibition
45 Pollutant (%) Source (mg/I) Source (lbs/day) (mg/I) Conc.Source Loading(lbs/day) (lbs/day) Loading Source
46 BOD
47 TSS
48 Ammonia 480 AS Inhibition 4995.9936 4995.99 AS/Nit/TF inhibition
49 Arsenic 0.1 AS Inhibition ' 1.0408 1.0408 AS/Nit/TF inhibition
50 Cadmium I AS Inhibition 10.4083 10.4083 AS/Nit/TF inhibition
51 Chromium 0.394 Nit.Inhibition 4.1009 4.1009 AS/Nit/TF inhibition
52 Copper 0.48 Nit.Inhibition 4.9960 4.9960 AS/Nit/TF inhibition
53 Cyanide 0.1 AS Inhibition 1.0408 1.0408 AS/Nit/TF inhibition
54 Lead 0.5 Nit.Inhibition 5.2042 5.2042 AS/Nit/TF inhibition
55 Mercury 0.1 AS Inhibition 1.0408 I 1.0408 AS/Nit/TF inhibition
56 Molybdenum
57 Nickel 0.25 Nit.Inhibition 2.6021 2.6021 AS/Nit/TF inhibition
58 Selenium
59 Silver 0.25 AS Inhibition 2.6021 2.6021 AS/Nit/TF inhibition
_
60 Zinc I AS Inhibition 10.4083 10.4083 AS/Nit/TF inhibition
61 Total Nitrogen
62 Total Phos.
Modeled after:Chapter 5-HWA Guidance,Appendix 5-A
Revision Date: February 2008

Workbook Name: HWAATDesign June 2022; Worksheet Name: HWA Page3of5
g Printed 6/29/2022,9:54 AM
A I B I C I D I E I F I G I H I I I J I K
63
64 Sludge Loading Calculations
Sludge Ceiling Class A Limits Class A Limits Class A Limits Minimum
Sludge Ceiling Sludge Ceiling Load Cumulative Sludge Cumulative Monthly Monthly Avg. Mon.Avg.Load. - Sludge
Concentration Limit Load -HASL Calc.- Rate Limit Sludge Loading Average Rate Loading HASL Cale.- Loading Minimum Sludge
65 Pollutant (mg/kg) (lbs/day) (lbs/day) (Ibs/(acre life)) (lbs/day) Limit(mg/kg) (lbs/day) (lbs/day) (lbs/day) Loading Sorce
66 BOD
67 TSS
68 Ammonia
69 Arsenic 75 0.2765 36 41 0.1512 0.1512 Class A,Mon.Avg.
70 Cadmium 85 0.2105 34 39 0.0966 0.0966 Class A,Mon.Avg.
71 Chromium
72 Copper 4300 7.8232 1338 1500 2.7290 2.7290 Class A,Mon.Avg.
73 Cyanide
74 Lead 840 2.2849 267 300 0.8160 0.8160 Class A,Mon.Avg.
75 Mercury 57 0.0997 15 17 0.0297 0.0297 Class A,Mon.Avg.
76 Molybdenum 75 0.3771 75 0.3771 0.3771 Sludge Ceiling
77 Nickel 420 1.6593 374 420 1.6593 1.6593 Sludge Ceiling
78 Selenium 100 0.3319 89 100 0.3319 0.3319 Sludge Ceiling
79 Silver
80 Zinc 7500 22.9390 2498 2800 8.5639 8.5639 Class A,Mon.Avg. ,
81 Total Nitrogen
82 Total Phos.
83 #REF!
84 #REF!
85 #REF!
86 #REF!
87 #REF!
88 #REF!
89 #REF!
90
Modeled after:Chapter 5-HWA Guidance,Appendix 5-A
Revision Date: February 2008

Workbook Name: HWAATDesign June 2022; Worksheet Name: HWA Page4of5
Printed 6/29/2022,9:54 AM
A I B I C I D I E I F I G I H I I I J ► K
91 Maximum Allowable Headworks Loading Calculations
Maximum
Minimum Pass Minimum Minimum Minimum Minimum Allowable
Through Loading Pass Through Inhibition Loading Inhibition Loading Sludge Loading Sludge Loading Headworks Loading Maximum Allowable Headworks
92 (lbs/day) Source (lbs/day) Source (lbs/day) Sorce (lbs/day) Loading Source
93 BOD 7506.0 Design 7506.0 Design
94 TSS 10508.4 Design 10508.4 Design
95 Ammonia 1201.0 Design 4995.9936 AS/Nit/TF inhibiti 1201.0 Design
96 Arsenic 0.1892 Stream Std 1.0408 AS/Nit/TF inhibiti 0.1512 Class A,Mon.Avg. 0.1512 Class A,Mon.Avg.
97 Cadmium 0.0347 Stream Std 10.4083 AS/Nit/TF inhibiti 0.0966 Class A,Mon.Avg. 0.0347 Stream Std
98 Chromium 0.6361 Stream Std 4.1009 AS/Nit/TF inhibiti I 0.6361 Stream Std
99 Copper 1.8924 Stream Std 4.9960 AS/Nit/TF inhibiti 2.7290 Class A,Mon.Avg. 1.8924 Stream Std
100 Cyanide 0.1679 Stream Std 1.0408 AS/NitfF inhibiti I 0.1679 Stream Std
101 Lead 0.2082 Stream Std 5.2042,AS/Nit/TF inhibiti 0.8160 Class A,Mon.Avg. 0.2082 Stream Std
102 Mercury 0.00243 Stream Std 1.0408 AS/Nit/TF inhibiti 0.0297 Class A,Mon.Avg. 0.00243 Stream Std
103 Molybdenum 31.0696 Stream Std 0.3771 Sludge Ceiling 0.3771 Sludge Ceiling
104 Nickel 1.3979 Stream Std 2.6021 AS/Nit/TF inhibiti 1.6593 Sludge Ceiling 1.3979 Stream Sid
105 Selenium 0.1041 Stream Std 0.3319 Sludge Ceiling 0.1041 Stream Std _
106 Silver 0.0025 Stream Std 2.6021 AS/Nit/IF inhibiti 0.0025 Stream Std _
107 Zinc 6.0425 Stream Std 10.4083 AS/Nit/TF inhibiti 8.5639 Class A,Mon.Avg. 6.0425 Stream Std
108 Total Nitrogen 474.9 NPDES 474.8555 NPDES
109 Total Phos. 190.1 NPDES 190.1063 NPDES
110 #REF! #REF! #REF! #REF! #REF! #REF! #REF!
111 #REF! #REF! #REF! #REF! #REF! #REF! #REF!
112 #REF! #REF! #REF! #REF! #REF! #REF! #REF!
113 #REF! #REF! #REF! #REF! #REF! #REF! #REF! _
114 #REF! #REF! #REF! #REF! #REF! #REF! #REF!
115 #REF! #REF! #REF! #REF! #REF! #REF! #REF!
116 #REF! #REF! #REF! #REF! #REF! #REF! #REF!
117
Modeled after:Chapter 5-HWA Guidance,Appendix 5-A
Revision Date: February 2008

Workbook Name: HWAATDesi n June 2022; Worksheet Name: HWA Page5of5
g Printed 6/29/2022,9:54 AM
A I B I C I D I E I F . G I H I I I J I K
118
119 Maximum Allowable Industrial Loadings Calculations
:Maximum Maximum
Allowable Check to Use Uncontrollable Allowable
Headworks Loading HASL Calcs Concentration Uncontrollable Uncontrollable Industrial Load Design vs.Pass-
120 Pollutant (lbs/day) MAHL Basis (x) (mg/I) Source Load(lbs/day) (lbs/day) Thru Warning
121 BOD 7506.0000 Design 232 Mass Balance 2401.1861 5104.8139
122 TSS 10508.4000 Design 212 Mass Balance 2194.1873 8314.2127
123 Ammonia 1200.9600 Design 42.Mass Balance 434.6975 766.2625
124 Arsenic 0.1512 Class A,Mon.Avg. 0.0029 Mass Balance 0.0300 0.1212
125 Cadmium 0.0347 Stream Std 0.0003 Mass Balance 0.0031 0.0316
126 Chromium 0.6361 Stream Std N/A 0.0034 Mass Balance 0.0352 0.6009
127 Copper 1.8924 Stream Std 0.027 Mass Balance 0.2794 1.6130
128 Cyanide 0.1679 Stream Std N/A 0.0025 Mass Balance 0.0259 0.1420
129 Lead 0.2082 Stream Std 0.0025 Mass Balance 0.0259 0.1823
130 Mercury 0.00243 Stream Std 0.0000131 Mass Balance 0.00014 0.00229
131 Molybdenum 0.3771 Sludge Ceiling 0.00025 Mass Balance 0.0026 0.3745
132 Nickel 1.3979 Stream Std 0.005 Mass Balance 0.0517 1.3462
133 Selenium 0.1041 Stream Std 0.005 Mass Balance 0.0517 0.0523
134 Silver 0.0025 Stream Std N/A 0 Mass Balance 0.0000 0.0025
135 Zinc 6.0425 Stream Std I 0.128 Mass Balance 1.3248 4.7177
136 Total Nitrogen 474.8555 NPDES 45.1 POTW Id Coin 466.7823 8.0732
137 Total Phos. 190.1063 NPDES 2.9 Mass Balance 30.0148 160.0915
138 #REF! #REF! #REF! #REF!
139 #REF! #REF! #REF! #REF!
140 #REF! #REF! #REF! #REF!
141 #REF! #REF! #REF! #REF!
142 #REF! #REF! #REF! #REF!
143 #REF! #REF! #REF! #REF!
144 #REF! #REF! #REF! #REF!
Modeled after:Chapter 5-HWA Guidance,Appendix 5-A
Revision Date: February 2008

2022 Uncontrollable Summary for HWA
POTW Name Town of Apex number from Mass balance sheet
I
POTW Uncontrollable Literature Sampled Value Used
Parameter Influent Mass Balance Uncontrollable Domestic In This POTW Comments
Conc.(mq/I) Conc.(mq/I) Conc.(mq/I) Conc.(mq/l) HWA
BOD 231 232 250 275 232 Used mass balance value.The data from SIU's and influent is all above the detection level. This
value is consistent with the average influent value.
TSS 211 212 250 410 212 Used mass balance value.The data from SIU's and influent is all above the detection level. This
value is consistent with the average influent value.
Ammonia 41.8 42.0 25 52 42.0 Used mass balance value.The data from SIU's and influent is all above the detection level. This
value is consistant with the average influent concentration.
Tot.Nitrogen 45.1 45.28 40.00 63.1 45.1 Used POTW Influent Concentration.The data from SIU's and influent is all above the detection
level. This value is close to the Unc Mass Balance concentration.
Phosphorus 5.87 5.90 8.00 9.02 5.90 Used mass balance value. This value is consistant with the average influent concentration.
Arsenic 0.0029 0.0029 0.003 0.0025 0.0029 Used inf sample or mass balance value as they were in agreement. Most data from the SIU's
and influent to the POTW is below detection level.
Cadmium 0.0003 0.0003 0.003 0.0005 0.0003 Used inf sample or mass balance value as they were in agreement. Most data from the SIU's
and influent to the POTW is below detection level.
Chromium 0.0035 0.0034 0.050 0.0084 0.0034 Used mass balance concentration. This value is consitant with the average inf sample.
Copper 0.027 0.027 0.061 0.049 0.027 Used inf sample or mass balance value as they were in agreement.
Cyanide 0.0025 0.0025 0.041 0.0025 0.0025 Used influent sample,sampled domestic or mass balance value as they were in agreement.
Lead 0.0025 0.0025 0.049 0.0025 0.0025 Used mass balance value or sample value as they are in agreement.Most data from the SIU's
and influent to the POTW is below detection level.
Mercury(ug/l) 0.0130 0.0131 0.300 0.107 0.0131 Used mass balance value. This value is more consistent with the average influent value.
Molybdenum 0.0025 0.0025 N/A 0.0025 0.0025 Used mass balance value. Most data from influent to the POTW is below detection level.
Nickel 0.005 0.005 0.021 0.0378 0.005 Used inf sample or mass balance value as they were in agreement.
Selenium 0.005 0.005 N/A 0.005 0.005 Used influent sample,sampled domestic or mass balance value as they were in agreement.
Silver 0.001 0.001 0.005 0.003 0 Used zero as silver is not a POC,there is no current NPDES limit on silver,no SIU limit and
silver is not requred by CFR 503.
Used mass balance value or influent concentration,as they were in agreement. This value is
Zinc 0.128 0.128 0.175 0.2165 0.128 more consistent than literature with the average influent value.
Used mass balance value.This value is more consistent than the literature with the average
Oil&Grease 24 24.1 100 20.1 24.1 influent value.
Updated 6/27/2022

1
Workbook Name : HWAATDesign June 2022, Worksheet Name: AT Printed: 6/29/2022, 9:00 AM
Page 1 of 6
Allocation Table Spreadsheet Instructions:
Headworks last approved: 12/31/15 1)Applicable Values should be entered in the Heavy Bordered cells. Rest of worksheet is protected,password is
Allocation Table updated: 06/26/22
2)Formulas are discussed in the Comprehensive Guidance,Chapter 6,Section C.
Permits last modified: 12/28/21 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 through BK.
POTw=> Apex WRF
NPDES#=> NC0064050
FLOW BOD TSS
Industry Type Renewal Modification Date Permit Limits Permit Limits Permit Limits
IUP INDUSTRY NAMES Permit Pipe of Effective Effective Permit Conc. Load Conc. Load
Count (please listalphabeticly) number number Industry Date Date Expires MGD gal/day mg/I lbs/day mg/I lbs/day
1 Tipper Tie 1 0002 0001 467 12/28/20 12/28/20 12/28/25 0.0150 15,000 37.50 31.30
2 Tipper Tie II 0010 0001 467 12/28/21 12/28/21 12/28/26 0.0050 5,000 37.50 31.30
3
4 ,
5
6
7
8
t
9 1
10
Column Totals=> 0.0200 20,000 75, 63
Basis=> NPDES Design Design
MAHL from HWA(lbs/day)=> NPDES Permitted Flow=> 3.6000 7506 10508
Uncontrollable Loading(lbs/day)=> 1.2410, 2401 2194
Total Allowable for Industry(MAIL)(Ibs/day)_> 2.3590 5105 8314
Total Permitted to Industry(lbs/day)=> 0.0200 75 63
MAIL left(lbs/day)_> 2.3390 5030 8252
Percent Allow.Ind.(MAIL)still available(%)=> 99.2% 98.5% 99.2%
Percent MAHL still available(%)_> 65.0% 67.0% 78.5%
5 Percent MAHL(lbs/day)=> 0.1800 375 525
HWA.AT
Revised:November 2005

Workbook Name : HWAATDesign June 2022, Worksheet Name: AT Printed:6/29/2022, 9:00 AM
Page 2 of 6
Allocation Table
Headworks last approved: 12/31/15
Allocation Table updated: 06/26/22
Permits last modified: 12/28/21
Porn=> Apex WRF
NPDES#=> NC0064050
Ammonia Arsenic Cadmium Chromium Copper Cyanide
Industry Permit Limits Permit Limits Permit Limits Permit Limits Permit Limits Permit Limits _
IUP INDUSTRY NAMES Permit Pipe Conc. Load Conc. Load Conc. Load Conc. Load Conc. Load Conc. Load
Count (please listalphabetidv) • number number mg/1 lbs/day mg/1 lbs/day mg/1 lbs/day mg/I lbs/day J mg/1 lbs/day mg/I lbs/day
1 Tipper Tie I 0002 0001 3.13 0.0500 0.0063 0.0300 0.0038 0.1210 0.0151 0.2000 0.0250 0.0200 0.0025
2 Tipper Tie II 0010 0001 3.13 0.0500 0.0021 0.0300 0.0013 0.2000 0.0083 0.2000 0.0083 0.0200 0.0008
3
4
5 _
6
7
8
9
10
Column Totals=> I 6 0.0083 0.0050 0.02351 0.0334 0.0033
Class A, Stream Stream Stream Stream
Basis=> Design Mon.Avg. Std Std Std Std
MAHL from HWA(lbs/day)_> 1200.96 0.1512 0.0347 0.6361 1.8924 0.1679
Uncontrollable Loading(lbs/day)_> 434.70 0.0300 0.0031 0.0352 0.2794 0.0259
Total Allowable for Industry(MAIL)(lbs/day)_> 766.26 0.1212 0.0316 0.6009 1.6130 0.1420
Total Permitted to Industry(lbs/day)=> 6.26 0.0083 0.0050 0.0235 0.0334 0.0033
MAIL left(lbs/day)_> 760.00 0.1128 0.0266 0.5774 1.5796 0.1387
Percent Allow.Ind.(MAIL)still available(%)=> 99.2% 93.1 % 84.2% 96.1 % 97.9% 97.7%
Percent MAHL still available(%)=> 63.3% 74.6% 76.6% 90.8% 83.5% 82.6%
5 Percent MAHL(lbs/day)_> 60.05 0.0076 0.00171 0.0318 0.0946 0.0084
HWA.AT
Revised:November 2005

Workbook Name : HWAATDesign June 2022, Worksheet Name: AT Printed: 6/29/2022, 9:00AM
Page 3 of 6
Allocation Table
Headworks last approved: 12/31/15
Allocation Table updated: 06/26/22
Permits last modified: 12/28/21
Pores., Apex WRF
NPDES#=> NC0064050
Lead Mercury Molybdenum Nickel Selenium Sit
Industry Permit Limits Permit Limits Permit Limits Permit Limits Permit Limits Permit
IUP INDUSTRY NAMES Permit Pipe Conc. Load Conc. Load Conc. Load Conc. Load Conc. Load Conc.
Count (please list alphabeticly) number number mg/I lbs/day mg/I lbs/day mg/1 lbs/day mg/1 lbs/day mg/1 lbs/day mg/1
I Tipper Tie I 0002 0001 0.0500 0.0063 0.00010 0.00001 0.0750 0.0094
2 Tipper Tie II 0010 0001 0.0500 0.0021 0.00010 0.00000~- 0.0750 0.0031
3
4
5
6
7
8
9
10
Column Totals=> 0.00831 0.000017 0.00001 0.0125 I 0.0000
Stream Sludge Stream Stream
Basis=> Std Stream Std Ceiling Std Std
MARL from HWA(lbs/day)_> 0.2082, 0.002430 0.3771 1.3979 0.1041
Uncontrollable Loading(lbs/day)=> 0.0259 0.000136 0.0026 0.0517 0.0517
Total Allowable for Industry(MAIL)(lbs/day)=> 0.1823 0.002294 0.3745 1.3462 0.0523
Total Permitted to Industry(lbs/day)_> 0.0083 0.000017 0.0000 0.0125 0.0000
MAIL left(lbs/day)=> 0.1740 0.002278 0.3745 1.3337 0.0523
Percent Allow.Ind.(MAIL)still available(%)=> 95.4% 99.3% 100.0% 99.1 % 100.0%
Percent MAHL still available(%)=> 83.6% 93.7% 99.3% 95.4% 50.3%
5 Percent MAHL(lbs/day)=> 0.0104 0.000121 0.0189 0.0699 0.0052
HWA.AT
Revised:November 2005

Workbook Name : HWAATDesign June 2022, Worksheet Name: AT Printed: 6/29/2022, 9:00 AM
Page 4 of 6
Allocation Table
Headworks last approved: 12/31/15
Allocation Table updated: 06/26/22
Permits last modified: 12/28/21
Pores=> Apex WRF
NPDES#=> NC0064050
ver
Industry Limits
IUP INDUSTRY NAMES Permit Pipe Load
Count (please list alphabeticly) number number lbs/day
1 Tipper Tie I 0002 0001
2 Tipper Tie II 0010 0001
3
4
5
6
7
8
9
10
Column Totals=> 0.0000
Stream
Basis=> Std
MARL from HWA(lbs/day)_> 0.0025
Uncontrollable Loading(lbs/day)_> 0.0000
Total Allowable for Industry(MAIL)(lbs/day)_> 0.0025
Total Permitted to Industry(lbs/day)=> 0.0000
MAIL left(lbs/day)=> 0.0025
Percent Allow.Ind.(MAIL)still available(%)=> 100.0%
Percent MAHL still available(%)_> 100.0%
5 Percent MAHL(lbs/day)_> 0.0001.
HWA.AT
Revised:November 2005

Workbook Name : HWAATDesign June 2022, Worksheet Name: AT Printed:6/29/2022, 9:00AM
Page 5 of 6
Allocation Table
Headworks last approved: 12/31/15
Allocation Table updated: 06/26/22
Permits last modified: 12/28/21
Pores=>Apex WRF
NPDESlfr> NC0064050
Zinc Total Nitrogen Total Phos. Oil and Grease #REF! #REF!
Industry Permit Limits Permit Limits Permit Limits Permit Limits Permit Limits Permit Limits
IUP INDUSTRY NAMES Permit Pipe Conc. Load Conc. Load Conc. Load Conc. Load Conc. Load Conc. Load
Count I (please list slphabeticly) number number 1 mg/1 lbs/day mg/1 lbs/day mg/1 lbs/day mg/1 lbs/day mg/I lbs/day mg/1 lbs/day
1 Tipper Tie I 0002 0001 0.4000 0.0500 3.13 10.00 1.25 17.3000 2.16
2 Tipper Tie II 0010 0001 0.4000 0.0167� 3.13 10.00 0.42 50.0000 2.09
3
-
4 ..... ..i f-
5
6
7
,----....
8
4
9
1
10
Column Totals=> 0.0667 6.26 1.67 4.2492 0.0000 0.0000
Stream
Basis=> Std NPDES NPDES #REF! #REF! #REF!
MARL from HWA(lbs/day)_> 6.0425 474.86 190.11 #REF! #REF! #REF!
Uncontrollable Loading(lbs/day)=> 1.3248 466.78 30.01
Total Allowable for Industry(MAIL)(lbs/day)_> 4.7177 8.07 160.09 #REF! #REF! #REF!
Total Permitted to Industry(lbs/day)_> 0.0667 6.26 1.67 4.2492 0.0000 0.0000
MAIL left(lbs/day)_> 4.6510 1.81 158.42 #REF! #REF! #REF!
Percent Allow.hid.(MAIL)still available(%)_> 98.6% 22.5% 99.0% #REF! #REF! #REF!
Percent MARL still available(%)=> 77.0% 0.4% 83.3% #REF! #REF! #REF!
5 Percent MAHL(lbs/day)_> 0.3021 23.74 9.5053 #REF! #REF! #REF!
H WA.AT
Revised:November 2005

Name: HWAATDesign June 2022 by Lori; Worksheet Name: HASL Page 1 of 1
Printed 6/29/2022,8:58 AM
Headworks Addendum for Sludge Loadings(HASL)worksheet
Class A-Composted Sludge
POTW Name=> Apex WRF Spreadsheet Instructions:
POTW NPDES#=> NC0064050 MAHL_sv= (Q_potw*C_inf*8.34)/(%_adj)lbs/day
POTW Sludge Permit#=> WQ0029376 1) Data entered only in Heavy Bordered cells. Rest of worksheet is protected,
Date=> 6/24/2022 password is"2". Q_potw=Average POTW flow(mgd)
POTW Average Flow=> 1.25 mgd C_inf=Average influent concentration(mgd)
Avg.sludge flow to Disposal=> 0.005717 mgd 2)This spreadsheet changes based on the class of sludge generated inputted in %_adj= Per percentage of Sludge Limit as decimal
Average%Solids to Disposal=> 3.48 % cell C13 of the HWA spreadsheet. The title and the limits in column G of this (example:enter 117%as 1.17)
Sludge Site Area permitted=> NA acres spreadsheet are updated automatically. 8.34= Conversion Factor
3)Formulas in Comprehensive Guidance HWA Chapter,Section K.
Enter actual Calculate MAHL_sv
CUMULATIVE Flag if> based on%of
LOADING data Class A Enter actual 80%of Monthly Average
from most recent Flag if Monthly MAXIMUM SLUDGE %of Applicable Concentration Limits
CUMULATIVE Sludge Report for Average CONC.from most Applicable Ceiling Flag if> Enter Average to Protect Sludge
SLUDGE the most heavily Cumulative than Concentrations recent Sludge Report Ceiling Conc. Conc. 100%of POTW Influent Quality(insert these
POLLUTANT LOADING LIMITS loaded field' Limit 80% Limits or LTMP Data Limit Limit the Limit Conc. values into HWA)
lbs/acre lbs/acre mg/dry kg mg/dry kg % Flag Flag mg/I lbs/day
41 0.0 % 0.0029 #DIV/0!Arsenic 360 000 �
Cadmium 34 1 200 3.1 % 0.000 0.1015
Chromium
Copper 1338 1500 249.000 16.6 % 0.027 1.6929
Lead 267 300 7.900 2.6 % 0.003 0.9881
'Mercury 15 17 0.380 2.2 % 0.0133 6.1930
Molybdenum 75 10.000 13.3 % 0.003 0.1952
Nickel 374 420 18.000 4.3 % 0.005 1.2143
Selenium 89 100 0.000 0.0 % 0.005 #DIV/0!
Zinc 2498 2800 660.000 23.6 % 0.128 5.6520
If over ceiling conc.
IF Greater than 80%Flag POTW MUST SUBMIT If Greater than 80%of the concentration limit POTW POTW must reduce
LAND APP&METALS MANAGEMENT PLAN n/a MUST SUBMIT METALS MANAGEMENT PLAN n/a MAHL n/a
1The most heavily loaded field is determined for each polluntant indivisually,and is the field that contains the highest amount(lbs/acre)of that polluntant.

SIU.Uncont.Mass.Bal
FLOW BOD TSS AMMONIA ARSENIC
INDUSTRY Industry Average Discharge Average Discharge Average Discharge Average Discharge Average Discharge
IUP NAMES Permit/Pipe Conc. Load Conc. Load Conc. Load Conc. Load
Count (please list alphabetically) number MGD gal/day mg/1 lbs/day mg/1 lbs/day mg/1 lbs/day mg/1 lbs/day
1 Tipper Tie I 2/001 0.00512 5,120 99.1 4.23 0.085 0.00 0.83 0.0354 0.0007 0.0000
2 Tipper Tie II 10/001 0.00158 1,580 131 1.73 0.048 0.00 0.99 0.0130 0.0022 0.0000
3
4
5 -
6
7
8
9
10
11
12
13
Sum of Industrial Loading(lbs/day)=> 0.0067 6700 5.9579 0.0043 0.0485 0.0001
MGD gal/day mg/1 lbs/day mg/1 lbs/day mg/1 lbs/day mg/1 lbs/day
Avg Influent loading(lbs/day)=>I 1.24811,248,000i 231I 2404.32 211 2196.16 41.8 435.0678 0.0029 0.0302
Uncontrollable Load from Mass Bal(lbs/day)=> 1.2413 ######## ######## 435.0193 0.0301
Uncontrollable Concen. from Mass Bal(mg/L)_> 2321 I 2121 I 42.01 l 0.00291
Uncont. from Uncont. Sampling(mg/L+lbs/day)_> 275 2846.92 410 4244.50 52 538.33 0.0025 0.0259
Uncontrollable Concen. From Literature(mg/L)_> 2501 I 2501 251 ( 0.0031
Uncontrollable conc. to be used in HWA(mg/L)_> 232 212 42 0.0029
Spreadsheet Instructions:
1)Applicable Values should be entered in the Heavy Bordered cells. Rest of worksheet is Choose"Uncontrollable Concentration to be used in HWA"(row 31)from Uncontrollable
protected, password is"2". Concentration From "Mass Balance"(row 25),
2)Formulas are discussed in the Comprehensive Guidance,Chapter 5,Section E,page 5. "Sampling"(row 27),or"Literature"(row 29). Document reasons.
2022 by Lori Uncontrollable Mass Balance Spreadsheet
SIU.Uncont.Mass.Bal
Page 1 of 5 pages
6/29/2022, 8:35 AM
Revision:August 1999

SIU.Uncont.Mass.Bal
FLOW CADMIUM CHROMIUM COPPER CYANIDE
INDUSTRY Industry Average Discharge Average Discharge Average Discharge Average Discharge Average Discharge
IUP NAMES Permit/Pipe Conc. Load Conc. Load Conc. Load Conc. Load
Count (please list alphabetically) number MGD gal/day mg/I lbs/day mg/1 lbs/day mg/1 lbs/day mg/1 lbs/day
1 Tipper Tie I 2 /001 0.00512 5,120 0.0005 0.0000 0.0213 0.0009 0.0197 0.0008 0.0033 0.0001
2 Tipper Tie II 10/001 0.00158 1,580 0.0005 0.0000 0.001 0.0000 0.0068 0.0001_ 0.0029 0.0000
3
4
5
6 \I 1
7
0111111111111111111111111111111111
8
9
10
11
12
13
Sum of Industrial Loading(lbs/day)_> 0.00671 6700 0.0000 0.0009 I 0.0009 I 0.0002
MGD gal/day mg/1 lbs/day mg/1 lbs/day mg/1 lbs/day mg/1 lbs/day
Avg Influent loading(lbs/day)=>) 1.24811,248,000 0.0003 0.0031 0.0035 0.0364 0.027 0.2810 0.0025 0.0260
Uncontrollable Load from Mass Bal(lbs/day)=> 1.2413 0.0031 0.0355 0.2801 0.0258
Uncontrollable Concen. from Mass Bal (mg/L)_> ( 0.00031 I 0.00341 I 0.0271 1 0.00251
Uncont. from Uncont. Sampling(mg/L+lbs/day)_> 0.0005 0.0052 0.0084 0.0870 0.049 0.5073 0.0025 0.0259
Uncontrollable Concen. From Literature(mg/L)=> ` 0.0031 I 0.051 I 0.061 I I 0.0411
Uncontrollable conc.to be used in HWA(mg/L)_> 0.0003 0.0034 0.027 0.0025
Spreadsheet Instructions:
1)Applicable Values should be entered in the Heavy Bordered cells. Rest of worksheet is Choose"Uncontrollable Concentration to be used in HWA"(row 31)from Uncontrollable
protected,password is"2". Concentration From "Mass Balance"(row 25),
2)Formulas are discussed in the Comprehensive Guidance,Chapter 5,Section E,page 5. "Sampling"(row 27),or"Literature"(row 29). Document reasons.
2022 by Lori Uncontrollable Mass Balance Spreadsheet
SIU.Uncont.Mass.Bal
Page 2 of 5 pages
6/29/2022, 8:35 AM
Revision:August 1999

SIU.Uncant.Mass.Bal
FLOW LEAD MERCURY MOLYBDENUM NICKEL
INDUSTRY Industry Average Discharge Average Discharge Average Discharge Average Discharge Average Discharge
IUP NAMES Permit/Pipe Conc. Load Conc. Load Conc. Load Conc. Load
Count (please list alphabetically) number MGD gal/day mg/1 lbs/day mg/1 lbs/day mg/1 lbs/day mg/1 lbs/day
1 Tipper Tie I 2/001 0.00512 5,120 0.0045 0.0002 0.0001 0.00000 0.005 0.0002
2 Tipper Tie II 10/001 0.00158 1,580 0.003 0.0000 0.0001 0.00000 0.005 0.0001
3 -4 11.11
5
6 7
8 9 •
10
11 I _----_
12
13 --
Sum of Industrial Loading(lbs/day)=> 0.0067 6700 0.0002 0.00000 0.0003
MGD gal/day mg/1 lbs/day mg/I lbs/day mg/1 lbs/day mg/1 lbs/day
Avg Influent loading(lbs/day)=> 1.248I1,248,000 0.0025 0.0260 0.000013 0.00014 0.0025 0.0260 0.005 0.0520
Uncontrollable Load from Mass Bal(lbs/day)_> 1.2413 0.0258 0.00014 0.0518
Uncontrollable Concen. from Mass Bal(mg/L)=> I 0.00251 10.00001311 I I 1- 0.00501
Uncont. from Uncont. Sampling(mg/L+lbs/day)_> 0.0025 0.0259 0.00011 0.0011 0.0025 0.0259 0.0378 0.3913
Uncontrollable Concen. From Literature(mg/L)_> I 0.0491 I 0.00031 1 I I 0.0211
Uncontrollable conc.to be used in HWA(mg/L)=> 0.0025 0.00001 0.0025 0.0378
Spreadsheet Instructions:
1)Applicable Values should be entered in the Heavy Bordered cells. Rest of worksheet is Choose"Uncontrollable Concentration to be used in HWA"(row 31)from Uncontrollable
protected, password is"2". Concentration From "Mass Balance"(row 25),
2)Formulas are discussed in the Comprehensive Guidance,Chapter 5,Section E,page 5.
"Sampling"(row 27),or"Literature"(row 29). Document reasons.
2022 by Lori Uncontrollable Mass Balance Spreadsheet
SIU.Uncont.Mass.Bal
Page 3 of 5 pages
6/29/2022,8:35 AM
Revision:August 1999

SIU.Uncont.Mass.Bal
FLOW SELENIUM SILVER ZINC Oil &Grease
INDUSTRY Industry Average Discharge Average Discharge Average Discharge Average Discharge Average Discharge
IUP NAMES Permit/Pipe Conc. Load Conc. Load Conc. Load Conc. Load
Count (please list alphabetically) number MGD gal/day mg/1 lbs/day mg/1 lbs/day mg/1 lbs/day mg/1 lbs/day
1 Tipper Tie I 2/001 0.00512 5,120 0.09 0.0038 6.61 0.2823
2 Tipper Tie II 10/001 0.00158 1,580 0.04 0.0005 3.78 0.0498
3
4
5
6
7
9
10
11
12 -~ �
13
Sum of Industrial Loading(lbs/day)_> 0.0067 6700 ( 0.0044 0.3321
MGD gal/day mg/1 lbs/day mg/1 lbs/day mg/1 lbs/day mg/1 lbs/day
Avg Influent loading(lbs/day)_> 1.24811,248,000 0.005 0.0520 0.001 0.0104 0.128 1.3323 24 249.7997
Uncontrollable Load from Mass Bal(lbs/day)_> 1.2413 1.3279 249.4676
Uncontrollable Concen. from Mass Bal(mg/L)_> I I I I I 0.12831 I 24.09751
Uncont. from Uncont. Sampling(mg/L+lbs/day)_> 0.005 0.0518 0.003 0.0311 0.2165 2.2413 20.1 208.0841
Uncontrollable Concen. From Literature(mg/L)_> I ( I 0.005I I 0.1751 I 501
Uncontrollable conc. to be used in HWA(mg/L)_> 0.005 0.001 0.1283 24.0972
Spreadsheet Instructions:u Choose"Uncontrollable Concentration to be used in HWA"(row 31)from Uncontrollable
1)Applicable Values should be entered in the Heavy Bordered cells. Rest of worksheet is
protected, password is"2". Concentration From "Mass Balance"(row 25),
2)Formulas are discussed in the Comprehensive Guidance,Chapter 5,Section E,page 5. "Sampling"(row 27),or"Literature"(row 29). Document reasons.
2022 by Lori Uncontrollable Mass Balance Spreadsheet
SIU.Uncont.Mass.Bal
Page 4 of 5 pages
6/29/2022,8:35 AM
Revision:August 1999

SIU.Uncant.Mass.Bal
. FLOW Total Nitrogen Total Phosphorus
INDUSTRY Industry Average Discharge Average Discharge Average Discharge Average Discharge Average Discharge
IUP NAMES Permit/Pipe Conc. Load Conc. Load Conc. Load Conc. Load
Count (please list alphabetically) number MGD gal/day mg/1 lbs/day mg/1 lbs/day mg/1 lbs/day mg/1 lbs/day
1 Tipper Tie I 2/001 0.00512 5,120 10.7 0.4569 0.104 0.0044
2 Tipper Tie II 10/001 0.00158 1,580 11.4 0.1502 0.071 0.0009
3 ------
4 ------
5 --_---
6 ------
7 MI8
9
10 --
1112
------
13
Sum of Industrial Loading(lbs/day)=> 0.0067 6700 0.6071 0.0054
MGD gal/day mg/1 lbs/day mg/1 lbs/day mg/I lbs/day mg/1 lbs/day
Avg Influent loading(lbs/day)_> 1.248 1,248,000 45.1 469.4152 5.87 61.0968
Uncontrollable Load from Mass Bal(lbs/day)=> 1.2413 468.8081 61.0915
Uncontrollable Concen. from Mass Bal(mg/L)_> ( 45.28481 I 5.90121 I I I I
Uncont. from Uncont. Sampling(mg/L+lbs/day)_> 63.1 653.2391 9.02 93.3790 - -
Uncontrollable Concen. From Literature(mg/L)_> I I I I ( ' 1
Uncontrollable conc. to be used in HWA(mg/L)_> 45.1 5.9
Spreadsheet Instructions:
1)Applicable Values should be entered in the Heavy Bordered cells. Rest of worksheet is Choose"Uncontrollable Concentration to be used in HWA"(row 31)from Uncontrollable
protected, password is"2". Concentration From "Mass Balance"(row 25),
2)Formulas are discussed in the Comprehensive Guidance,Chapter 5,Section E,page 5. "Sampling"(row 27),or"Literature"(row 29). Document reasons.
2022 by Lori Uncontrollable Mass Balance Spreadsheet
SIU.Uncont.Mass.Bal
Page 5 of 5 pages
6/29/2022,8:35 AM
Revision:August 1999

Town of Apex
Removal Rate Calculations
FLOW BOD TSS
Influent Used in Effluent Used in Influent Used in Effluent Used in
Sample Date mgd < mg/L Calculation < mg/L Calculation < mg/L Calculation < mg/L. Calculation
2/5/2019 DMR AVG Spreadsheet 1.572 228 228 < 2 I 250 250 < 2.5 1.25
Instructions:
5/2019 DMR AVG 1) Data 1.133 256 256 < 2 1 229 229 < 2.5 1.25
enteredHeavy only it
;p5/12/2019LTMP k
6/2019 DMR AVG Bordered 1.096 309 309 3.18 3.18 272 272 < 2.5 1.25
cells. Rest of
7/2019 DMR AVG worksheet is 0.987 290 290 < 2 1 282 282 < 2.5 1.25
8/2019 DMR AVG protected,password 233 233 2 1 241 241 2.5 1.25
password is _
8/11/2019 LIMP „2"
9/2019 DMR AVG 2) For below 1.083 278 278 < 2 I 237 237 < 2.5 1.25
detection data
10/2019 DMR AVG enter"<"in"<' 1.059 277 277 < 2 I 241 241 < 2.5 1.25
11/2019 DMR AVG column,and 1.096 248 248 < 2I 216 216 < 2.5 1.25
enter
11/5/2019 LTMP detection level
in Influent or
12/2019 DMR AVG Effluent mg/I 1.26 251 251 < 2 1 214 214 < 2.5 1.25
columns. I�
1/2020 DMR AVG Spreadsheet 1.409 217 217 < 2 1 192 192 < 2.5 1.25
2/2020 DMR AVG w ll auto-
1.642 188 188 I 171 171 < 2.5 1.25
matically
' 2/3/2020 LTMP calculate
3/2020 DMR AVG removalaverages rateands 1.371 238 238 2 I 1 SO 189 25 1.25
4/2020 DMR AVG valueusing entered.1/2 1.204 260 260 2 I 263 203 2.5 1.25
5/2020 DMR AVG 3)Document 1.320 244 244 < 2 1 206 206 - 2.5 1.25
5/12/2020 LTMP removal Rate
6/2020 DMR AVG choice 1.221 249 249 2.16 2.16 201 201 2.5 1.25
7/2020 DMR AVG 4)Formulas in 1.144 246 246 C 2 I 201 201 2.51.25
Compre-
8/2020 DMR AVG hensive Guide 1.271 249 249 < 2 I 212 212 2.5 1.25
HWA Chapter,
8/11/2020 LTMP Section E,
1.
9/2020 DMR AVG page1.324 258 258 < 2 I 229 229 2.) 1.25
10/2020 DMR AVG 1.266 274 274 < 2 1 234 234 2.5 1.25
11/2020 DMR AVG 1.318 233 233 < 2 1 202 202 - 2.5 1.25
11/5/2020 LTMP
12/2020 DMR AVG 1.488 209 209 < 2 1 179 179 2.5 1.25
1/2021 DMR AVG 1.601 187 ' 187 < 2 1 154 154 - 2.5 1.25
2/2021 DMR AVG 1.856 166 166 < 2 1 150 150 2.5 1.25
2/3/2021 LTMP
3/2021 DMR AVG 1.407 222 222 < 2 1 198 198 < 2.5 1.25
4/2021 DMR AVG 1.2 279 279 2.4 2.4 277 277 2.5 1.25
5/2021 DMR AVG 1.057 300 300 < 2 1 291 291 . 2.5 1.25
5/12/2021 LTMP
6/2021 DMR AVG 1.106 279 279 < 2 I 252 252 < 2.5 1.25
7/2021 DMR AVG 1.104 266 266 < 2 I 285 285 < 2.5 1.25
8/2021 DMR AVG 1.004 345 345 < 2 I 325 325 < 2.5 1.25
8/11/2021 LTMP
9/2021 DMR AVG 1.0256 267 267 < 2 I 260 260 < 2.5 1.25
10/2021 DMR AVG 1.164 219 219 < 2 I 192 192 < 2.5 1.25
11/2021 DMR AVG 1.055 237 237 < 2 I 214 214 < 2.5 1.25
11/5/2021 LTMP
r 12/2021 DMR AVG 1.119 237 237 < 2 I 223 223 < 2.5 1.25
1/2022 DMR AVG 1.462 184 184 < 2 I 174 174 < 2.5 1.25
2/2022 DMR AVG 1.251 241 241 < 2 I 219 219 < 2.5 1.25
2/3/2022 LTMP 1.404
3/2022 DMR AVG 239 239 < 2 I 226 226 < 2.5 1.25
4/2022 DMR AVG 1.303 222 222 2 1 216 216 < 2.5 1.25
5/2022 DMR AVG 1.281 297 297 2.14 2.14 237 237 < 2.5 1.25
Column Averages=> 1.260 248 1.15 224 1.25
Unpaired Site Specific RR=> 99.53% Unpaired Site Specific RR=> 99.44%
Literature/Default RR=> 85.00% Literature/Default RR=> 85.00%
45 % of data is BDL 50 % of data is BDL
RR for this HWA=> 99.53% RR for this HWA= 99.44%
HWAATDesign June 2022 by Lori
Removal Rates
Page 1 of 20 pages
6/29/2022, 8:32 AM
Revision:August 1999

r 1
Town of Apex
Removal Rate Calculations
AMMONIA ARSENIC
Influent Used in Effluent Used in Influent Used in Effluent Used in
Sample Date < mg/L Calculation < mg/L Calculation < mg/L Calculation
2/5/2019 DMR AVG A 48.6 48.6 I< 0.1 0.05 < 0.005 111 0.005 0.0025
5/2019 DMR AVG 34 34 < 0.1 0.05
5/12/2019 LTMP < 0.005 0.0025 0.005 0.0025
6/2019 DMR AVG 40.1 40.1 0.12 0.12
7/2019 DMR AVG 42.5 42.5 < 0.1 0.05
8/2019 DMR AVG I 36.8 36.8 I< 0.1 0.05 ®�
8/11/2019 LTMP I1 0.005 1 1 0.005 0.0025
9/2019 DMR AVG 42.6 42.6 < 0.1 0.05
10/2019 DMR AVG 47.8 47.8 < 0.1 0.05
11/2019 DMR AVG 43 43 < 0.1 0.05
11/5/2019 LTMP < 0.005 0.0025 < 0.005 0.0025
12/2019 DMR AVG 41.5 41.5 < 0.1 0.05
1/2020 DMR AVG 33.8 33.8 0.21 0.21
2/2020 DMR AVG 32.8 32.8 0.11 0.11
2/3/2020 LTMP < 0.005 0.0025 i 0.005 0.0025
3/2020 DMR AVG 32.8 32.8 < 0.1 0.05
4/2020 DMR AVG 31.7 31.7 < 0.1 0.05 -I
5/2020 DMR AVG 31.9 31.9 0.12 0.12 ®�
5/12/2020 LTMP �r < 0.005 1 11 0.005 0.0025
6/2020 DMR AVG 32.3 32.3 0.13 0.13 _1-
7/2020 DMR AVG 36.4 36.4 < 0.1 0.05 II-_
8/2020 DMR AVG 38.6 38.6 < 0.1 0.05
8/11/2020 LTMP < 0.005 0.0025 e 0.005 0.0025
9/2020 DMR AVG ' 1 38.2 38.2 0.12 0.12
10/2020 DMR AVG 39.6 39.6 0.21 0.21 -.-
11/2020 DMR AVG 38.9 38.9 0.142 0.142 < 0.005 0.0025 Q 0.005 0.0025
11/5/2020 LTMP II12/2020 DMR AVG 34.4 34.4 0.155 0.155 -.
1/2021 DMR AVG 35.3 35.3 0.194 0.194 -.
2/2021 DMR AVG 22.4 22.4 0.386 0.386 < 0.005 0.0025 0.0025
2/3/2021 LTMP
3/2021 DMR AVG 28.4 28.4 0.31 0.31
4/2021 DMR AVG 35 35 < 0.1 0.05
5/2021 DMR AVG 46.4 46.4 < 0.1 0.05 0.008 0.0080.0050.0025
5/12/2021 LTMP
6/2021 DMR AVG 46.7 46.7 < 0.1 0.05
7/2021 DMR AVG 47.3 47.3 < 0.1 0.05
8/2021 DMR AVG 49 49 0.15 0.15 < 0.005 0.0025 0 0.005 0.0025
8/11/2021 LTMP
9/2021 DMR AVG 56.5 56.5 < 0.1 0.05
10/2021 DMR AVG 55 55 0.425 0.425
11/2021 DMR AVG 57.7 57.7 < 0.1 A 0.05 < 0.005 0.0025 < 0.005 0.0025
11/5/2021 LTMP -1-
12/2021 DMR AVG 59.3 59.3 < 0.1 0.05 11--
1/2022 DMR AVG 46 0.14 0.14 2
2/2022 DMR AVG 51.6 ®1 51.6 0.19 0.19 < 0.005 1 0.0025
2/3/2022 LTMP
3/2022 DMR AVG 45.8 ' 45.8 0.15 0.15
4/2022 DMR AVG 38 38 < 0.1 0.05
5/2022 DMR AVG 40.7 40.7 < 0.1 0.05 < 0.005 0.0025 111 0.005 0.0025
Column Averages=> 41.0 0.113 0.0029 0.0025
Unpaired Site Specific RR=> 99.72% Unpaired Site Specific RR=>p 50%BDI
Literature/Default RR=> 85.00% Literature/Default RR=> 45.00%
28 % of data is BDL 96 % of data is BDL
RR for this HWA=> 99.72% RR for this HWA=> 45.00
HWAATDesign June 2022 by Lori
Removal Rates
Page 2 of 20 pages
6/29/2022, 8:32 AM
Revision:August 1999

Town of Apex
Removal Rate Calculations
CADMIUM CHRO UM
Influent Used in Effluent Used in Influent Used in Effluent Used in
Sample Date < mg/L Calculation < mg/L Calculation < mg/L Calculation < mg/L Calculation
2/5/2019 DMR AVG < 0.001 0.0005 < 0.001 0.0005 < 0.005 0.0025 < 0.005 0.0025
5/2019 DMR AVG
5/12/2019 LTMP < 0.001 0.0005 < 0.001 0.0005 < 0.005 0.0025 < 0.005 0.0025
6/2019 DMR AVG
7/2019 DMR AVG
8/2019 DMR AVG
8/11/2019 LTMP < 0.001 0.0005 < 0.001 0.0005 < 0.005 0.0025 < 0.005 0.0025
9/2019 DMR AVG
10/2019 DMR AVG
11/2019 DMR AVG
11/5/2019 LTMP < 0.001 0.0005 < 0.001 0.0005 < 0.005 0.0025 < 0.005 0.0025
12/2019 DMR AVG
1/2020 DMR AVG
2/2020 DMR AVG
2/3/2020 LTMP < 0.001 0.0005 < 0.001 0.0005 < 0.005 0.0025 < 0.005 0.0025
3/2020 DMR AVG
4/2020 DMR AVG
5/2020 DMR AVG
5/12/2020 LTMP < 0.001 0.0005 < 0.001 0.0005 < 0.005 0.0025 < 0.005 0.0025
6/2020 DMR AVG
7/2020 DMR AVG
8/2020 DMR AVG
8/11/2020 LTMP < 0.0005 0.00025 < 0.0005 0.00025 < 0.005 0.0025 < 0.005 0.0025
9/2020 DMR AVG
10/2020 DMR AVG
11/2020 DMR AVG < 0.0005 0.00025 < 0.0005 0.00025 < 0.005 0.0025 < 0.005 0.0025
11/5/2020 LTMP
12/2020 DMR AVG
1/2021 DMR AVG
2/2021 DMR AVG < 0.0005 0.00025 < 0.0005 0.00025 < 0.005 0.0025 < 0.005 0.0025
2/3/2021 LTMP
3/2021 DMR AVG
4/2021 DMR AVG
5/2021 DMR AVG < 0.0005 0.00025 < 0.0005 0.00025 < 0.005 0.0025 < 0.005 0.0025
5/12/2021 LTMP
6/2021 DMR AVG
7/2021 DMR AVG
8/2021 DMR AVG < 0.0005 0.00025 < 0.0005 0.00025 < 0.005 0.0025 < 0.005 0.0025
8/11/2021 LTMP
9/2021 DMR AVG
10/2021 DMR AVG
11/2021 DMR AVG < 0.0005 0.00025 < 0.0005 0.00025 < 0.005 0.0025 < 0.005 0.0025
11/5/2021 LTMP
12/2021 DMR AVG _
1/2022 DMR AVG
2/2022 DMR AVG l< 0.0005 0.00025 < 0.0005 0.00025 < 0.005 0.0025 < 0.005 0.0025
2/3/2022 LTMP
3/2022 DMR AVG
4/2022 DMR AVG
5/2022 DMR AVG < 0.0005 0.00025 < 0.0005 0.00025 0.016 0.016 < 0.005 0.0025
Column Averages=> 0.0004 0.0004 0.0035 0.0025
Unpaired Site Specific RR=>p 50%BDL Unpaired Site Specific RR=>'50%BDI
Literature/Default RR=> 67.00% Literature/Default RR=> 82.00%
100 % of data is BDL 96 % of data is BDL
RR for this HWA=> 67.00% RR for this HWA=> 82.00%
HWAATDesign June 2022 by Lori
Removal Rates
Page 3 of 20 pages
6/29/2022, 8:32 AM
Revision:August 1999

Town of Apex
Removal Rate Calculations
COPPER CYANIDE
Influent Used in Effluent Used in Influent Used in Effluent Used in
Sample Date < mg/L Calculation < mg/L Calculation < mg/L Calculation < mg/L Calculation
2/5/2019 DMR AVG 0.027 0.027 0.002 0.002 < 0.005 0.0025 < 0.005 0.0025
5/2019 DMR AVG
5/12/2019 LTMP 0.038 0.038 0.003 0.003 < 0.005 0.0025 < 0.005 0.0025
6/2019 DMR AVG
7/2019 DMR AVG
8/2019 DMR AVG
8/11/2019 LTMP 0.025 0.025 0.001 0.001 < 0.005 0.0025 < 0.005 0.0025
9/2019 DMR AVG
10/2019 DMR AVG
11/2019 DMR AVG
11/5/2019 LTMP 0.024 0.024 0.002 0.002 < 0.005 0.0025 < 0.005 0.0025
12/2019 DMR AVG
1/2020 DMR AVG _
2/2020 DMR AVG
2/3/2020 LTMP 0.026 0.026 0.003 0.003 < 0.005 0.0025 < 0.005 0.0025
3/2020 DMR AVG
4/2020 DMR AVG
5/2020 DMR AVG
5/12/2020 LTMP 0.025 0.025 < 0.002 0.001 < 0.005 0.0025 <4 0.005 0.0025
6/2020 DMR AVG _
7/2020 DMR AVG
8/2020 DMR AVG
8/11/2020 LTMP 0.03 0.03 < 0.002 0.001 < 0.005 0.0025 < 0.005 0.0025
9/2020 DMR AVG
10/2020 DMR AVG
11/2020 DMR AVG 0.031 0.031 0.004 0.004 < 0.005 0.0025 < 0.005 0.0025
11/5/2020 LTMP
12/2020 DMR AVG I
1/2021 DMR AVG
2/2021 DMR AVG 0.017 0.017 0.002 0.002 < 0.005 0.0025 < 0.005 0.0025
2/3/2021 LTMP
3/2021 DMR AVG
4/2021 DMR AVG
5/2021 DMR AVG 0.048 0.048 0.004 0.004 < 0.005 0.0025 < 0.005 0.0025
5/12/2021 LTMP
6/2021 DMR AVG
7/2021 DMR AVG
8/2021 DMR AVG 0.026 0.026 0.003 0.003 < 0.005 0.0025 < 0.005 0.0025
8/11 2 21 LTMP/ 0
9/2021 DMR AVG _
10/2021 DMR AVG
11/2021 DMR AVG 0.026 0.026 0.002 0.002 < 0.005 0.0025 < 0.005 0.0025
11/5/2021 LTMP
12/2021 DMR AVG
1/2022 DMR AVG
2/2022 DMR AVG 0.029 0.029 0.003 0.003 < 0.005 0.0025 < 0.005 0.0025
2/3/2022 LTMP
3/2022 DMR AVG
4/2022 DMR AVG
5/2022 DMR AVG 0.003 0.003 0.002 0.002 ! < 0.005 0.0025 < 0.005 0.0025
Column Averages=> 0.027 0.002 0.0025 0.0025
Unpaired Site Specific RR=> 91.20% Unpaired Site Specific RR=>F 50%BDI
Literature/Default RR=> 86.00% Literature/Default RR=> 69.00%
7 % of data is BDL 100 % of data is BDL
RR for this HWA=> 91.20% RR for this HWA=> 69.00%
HWAATDesign June 2022 by Lori
Removal Rates
Page 4 of 20 pages
6/29/2022, 8:32 AM
Revision:August 1999

Town of Apex
Removal Rate Calculations
LEAD
Influent Used in Effluent Used in Influent Used in Effluent Used in
Sample Date < mg/L Calculation < mg/L Calculation < ug/L Calculation < ug/L Calculation
2/5/2019 DMR AVG < 0.005 0.0025 < 0.005 0.0025 0.002 0.002 0.00133 0.00133
5/2019 DMR AVG
5/12/2019 LTMP < 0.005 0.0025 <' 0.005 0.0025 0.0029 0.0029 0.0013 0.0013
6/2019 DMR AVG
7/2019 DMR AVG
8/2019 DMR AVG
8/11/2019 LTMP < 0.005 0.0025 <' 0.005 0.0025 < 0.0005 0.00025 0.0006 0.0006
9/2019 DMR AVG
10/2019 DMR AVG _
11/2019 DMR AVG
11/5/2019 LTMP < 0.005 0.0025 < 0.005 0.0025 < 0.0025 0.00125 < 0.0005 0.00025
12/2019 DMR AVG
1/2020 DMR AVG
2/2020 DMR AVG
2/3/2020 LTMP < 0.005 0.0025 < 0.005 0.0025 0.0063 0.0063 < 0.0005 0.00025
3/2020 DMR AVG
4/2020 DMR AVG
5/2020 DMR AVG
5/12/2020 LTMP <I 0.005 0.0025 < 0.005 0.0025 < 0.0025 0.00125 0.0008 0.0008
6/2020 DMR AVG
7/2020 DMR AVG
8/2020 DMR AVG
8/11/2020 LTMP 0.005 0.0025 < 0.005 0.0025 0.0047 0.0047 < 0.0005 0.00025
9/2020 DMR AVG _
10/2020 DMR AVG
11/2020 DMR AVG I< 0.005 0.0025 < 0.005 0.0025 0.011 0.011 < 0.0005 0.00025
Now
11/5/2020 LTMP
12/2020 DMR AVG
1/2021 DMR AVG
2/2021 DMR AVG ( 0.0025 < 0.005 0.0025 0.024 0.024 < 0.0005 0.00025
2/3/2021 LTMP
3/2021 DMR AVG
4/2021 DMR AVG
5/2021 DMR AVG 0.005 0.0025 0 005 0.0025 0.009 0.009 0.0006 0.0006
5/12/2021 LTMP
6/2021 DMR AVG
7/2021 DMR AVG
8/2021 DMR AVG < 0.005 0.0025 < 0.005 0.0025 0.0532 0.0532 0 i201 0.00201
8/11/2021 LTMP
9/2021 DMR AVG
10/2021 DMR AVG
11/2021 DMR AVG < 0.005 0.0025 0.005 0.0025 0.0126 0.0126 < 0.0005 0.00025
11/5/2021 LTMP
12/2021 DMR AVG
1/2022 DMR AVG
2/2022 DMR AVG < 0.005 0.0025 0.005 0.0025 0.0167 0.0167 < 0.0005 0.00025
2/3/2022 LTMP
3/2022 DMR AVG
4/2022 DMR AVG
5/2022 DMR AVG < 0.0025 < 0.005 0.0025 0.0231 0.0231 r< 0.0005 0.00025
Column Averages=> 0.0025 0.0025 0.01202 0.0006171
Unpaired Site Specific RR=> 50%BDL Unpaired Site Specific RR=> 94.86%
Literature/Default RR=> 61.00% Literature/Default RR=> 60.00%
100 % of data is BDL 39 % of data is BDL
RR for this HWA=> 61.00% RR for this HWA=> 94.86%
HWAATDesign June 2022 by Lori
Removal Rates
Page 5 of 20 pages
6/29/2022, 8:32 AM
Revision:August 1999

Town of Apex
Removal Rate Calculations
MOLYBDENUM NICKEL
Influent Used in Effluent Used in Influent Used in Effluent Used in
Sample Date < mg/Lmg/L Calculation < Calculation < mg/L Calculation
2/5/2019 DMR AVG < 0.005 0.0025 < 0.005 0.0025 < 0.01 0.005 < 0.01 0.005
5/2019 DMR AVG
5/12/2019 LTMP < 0.005 0.0025 0.005 0.0025 < 0.01 0.005 < 0.01 0.005
6/2019 DMR AVG
7/2019 DMR AVG
8/2019 DMR AVG
9 LTMP ®®I 0.0025 < 0.01 0.005 < 0.01 0.005
9/20l9/2019 D DMR AVG
10/2019 DMR AVG •--�--
11/2019 DMR AVG
11/5/2019 LTMP III®®I 0.005 0.0025 < 0.01 0.005 < 0.01 0.005
1 DMR AVG -1-
1/2020 DMR AVG
2/2020 DMR AVG - -- p
2/3/2020 LTMP 0.005 0.0025 < 0.005 0.0025 < 0.01 0.005 0.01 0.005
3/2020 DMR AVG
4/2020 DMR AVG
5/2020 DMR AVG
5/12/2020 LTMP 0.005 0.0025 0.005 0.0025 < 0.01 0.005 < 0.01 0.005
6/2020 DMR AVG
7/2020 DMR AVG
8/2020 DMR AVG
8/11/2020 LTMP < 0.005 0.0025 11 0.005 0.0025 < 0.01 0.005 < 0.01 0.005
9/2020 DMR AVG --
10/2020 DMR AVG
11/2020 DMR AVG ® 0.005 0.0025 0.005 0.0025 0.01 0.005 0.01 0.005
11/5/2020 LTMP
12/2020 DMR AVG
1/2021 DMR AVG
2/2021 DMR AVG 0.0025 0.005 0.0025 < 0.01 0.005 0.01 0.005
2/3/2021 LTMP
3/2021 DMR AVG
4/2021 DMR AVG
5/2021 DMR AVG ® 0.005 0.0025 Q 0.005 0.0025 < 0.01 0.005 < 0.01 0.005
5/12/2021 LTMP
6/2021 DMR AVG
7/2021 DMR AVG
8/2021 DMR AVG < 0.005 0.0025 0.005 0.0025 < 0.01 0.005 < 0.01 0.005
8/11/2021 LTMP
9/2021 DMR AVG
10/2021 DMR AVG
11/2021 DMR AVG I 0.005 0.0025 I 0.005 0.0025 < 0.01 0.005 < 0.01 0.005
11/5/2021 LTMP
12/2021 DMR AVG
1/2022 DMR AVG
2/2022 DMR AVG < 0.0050.005 0.0025 < 0.01 0.005 < 0.01 0.005
2/3/2022 LTMP --1--
3/2022DMR AVG •--�--
4/2022 DMR AVG5/2022 DMR AVG 111 0.005 0.0025 111 0.005 0.0025 0.009 0.009 0.004 0.004
Column Averages=> 0.0025 0.0025 0.0053 0.0049
Unpaired Site Specific RR=> 50%BDL Unpaired Site Specific RR=> 50%BDI
Literature/Default RR=> 33.00% Literature/Default RR=> 42.00%
100 % of data is BDL 93 % of data is BDL
RR for this HWA=> 33.00% RR for this HWA=> 42.00%
HWAATDesign June 2022 by Lori
Removal Rates
Page 6 of 20 pages
6/29/2022, 8:32 AM
Revision:August 1999

Town of Apex
Removal Rate Calculations
SELENIUM
Influent Used in Effluent Used in Influent Used in Effluent Used in
Sample Date < mg/L Calculation < mg/L Calculation < mg/L Calculation < mg/L Calculation
2/5/2019 DMR AVG < 0.01 0.005 < 0.01 0.005 < 0.005 0.0025 < 0.005 0.0025
5/2019 DMR AVG
5/12/2019 LTMP < 0.01 0.005 < 0.01 0.005 < 0.005 0.0025 < 0.005 0.0025
6/2019 DMR AVG
7/2019 DMR AVG
8/2019 DMR AVG
8/11/2019 LTMP < 0.01 0.005 < 0.01 0.005 < 0.005 0.0025 < 0.005 0.0025
9/2019 DMR AVG
10/2019 DMR AVG
11/2019 DMR AVG
11/5/2019 LTMP < 0.01 0.005 < 0.01 0.005 < 0.005 0.0025 < 0.005 0.0025
12/2019 DMR AVG
1/2020 DMR AVG
2/2020 DMR AVG
2/3/2020 LTMP < 0.01 0.005 < 0.01 0.005 < 0.005 0.0025 < 0.005 0.0025
3/2020 DMR AVG
4/2020 DMR AVG
5/2020 DMR AVG
5/12/2020 LTMP - 0.01 0.005 < 0.01 0.005 < 0.005 0.0025 < 0.005 0.0025
6/2020 DMR AVG
7/2020 DMR AVG
8/2020 DMR AVG
8/11/2020 LTMP 0.01 0.005 < 0.01 0.005 < 0.001 0.0005 < 0.001 0.0005
9/2020 DMR AVG
10/2020 DMR AVG
11/2020 DMR AVG 0.01 0.005 < 0.01 0.005 0.007 0.007 0.001 0.0005
11/5/2020 LTMP
12/2020 DMR AVG
1/2021 DMR AVG
2/2021 DMR AVG < 0.01 0.005 0.01 0.005 < 0.001 0.0005 < 0.001 0.0005
■
2/3/2021 LTMP
3/2021 DMR AVG
4/2021 DMR AVG
5/2021 DMR AVG < 0.01 0.005 0.01 0.005 0.001 0.001 < 0.001 0.0005
5/12/2021 LTMP
6/2021 DMR AVG
7/2021 DMR AVG
8/2021 DMR AVG < 0.01 0.005 • 0.01 0.005 < 0.001 0.0005 < 0.001 0.0005
8/11/2021 LTMP
9/2021 DMR AVG
10/2021 DMR AVG
11/2021 DMR AVG < 0.01 0.005 < 0.01 0.005 0.003 0.003 < 0.001 0.0005
11/5/2021 LTMP
12/2021 DMR AVG
1/2022 DMR AVG
2/2022 DMR AVG < 0.01 0.005 < 0.01 0.005 < 0.001 0.0005 < 0.001 0.0005
2/3/2022 LTMP
3/2022 DMR AVG
4/2022 DMR AVG
5/2022 DMR AVG 0.01 0.005 < 0.01 0.005 < 0.001 0.0005 < 0.001 0.0005
Column Averages=> 0.0050 0.0050 0.0020 0.0014
Unpaired Site Specific RR=> 50%BDL Unpaired Site Specific RR=> 50%BDI
Literature/Default RR=> 50.00% Literature/Default RR=> 75.00%
100 % of data is BDL 89 % of data is BDL
RR for this HWA=> 50.00% RR for this HWA=> 75.00%
HWAATDesign June 2022 by Lori
Removal Rates
Page 7 of 20 pages
6/29/2022, 8:32 AM
Revision:August 1999

Town of Apex
Removal Rate Calculations
Oil&Grease
Influent Used in Effluent Used in Influent Used in Effluent Used in
Sample Date < mg/L Calculation < mg/L Calculation < mg/L Calculation < mg/L Calculation
2/5/2019 DMR AVG 0.119 0.119 0.047 0.047 27 27 < 5 2.5
5/2019 DMR AVG
5/12/2019 LTMP 0.142 0.142 0.055 0.055 ` 26 26 < 5 2.5
6/2019 DMR AVG
7/2019 DMR AVG
8/2019 DMR AVG
8/11/2019 LTMP 0.107 0.107 0.062 0.062 13 13 < 5 2.5
9/2019 DMR AVG
10/2019 DMR AVG
11/2019 DMR AVG
11/5/2019 LTMP 0.141 0.141 0.062 0.062 32 32 < 5 2.5
12/2019 DMR AVG _
1/2020 DMR AVG
2/2020 DMR AVG
2/3/2020 LTMP 0.106 0.106 0.042 0.042 19 19 < 5 2.5
3/2020 DMR AVG
4/2020 DMR AVG
5/2020 DMR AVG
5/12/2020 LTMP 0.125 0.125 0.038 0.038 37.1 37.1 < 5 2.5
6/2020 DMR AVG
7/2020 DMR AVG
8/2020 DMR AVG
8/11/2020 LTMP 0.115 0.115 0.047 0.047 31.5 31.5 < 5 2.5
9/2020 DMR AVG
10/2020 DMR AVG
11/2020 DMR AVG 0.138 0.138 0.068 0.068 30.4 30.4 < 5 2.5
11/5/2020 LTMP
12/2020 DMR AVG
1/2021 DMR AVG
2/2021 DMR AVG 0.083 0.083 0.047 0.047 12.4 12.4 < 5 2.5
2/3/2021 LTMP
3/2021 DMR AVG
4/2021 DMR AVG
5/2021 DMR AVG 0.174 0.174 0.076 0.076 33.5 33.5 < 5 2.5
5/12/2021 LTMP
6/2021 DMR AVG
7/2021 DMR AVG
8/2021 DMR AVG 0.133 0.133 0.063 0.063 22.6 22.6 < 5 2.5
8/11/2021 LTMP
9/2021 DMR AVG
10/2021 DMR AVG _
11/2021 DMR AVG 0.126 0.126 0.069 0.069 13.5 13.5 < 5 2.5
11/5/2021 LTMP
12/2021 DMR AVG
1/2022 DMR AVG
2/2022 DMR AVG 0.105 0.105 0.058 0.058 11.3 11.3 < 5 2.5
2/3/2022 LTMP
3/2022 DMR AVG
4/2022 DMR AVG
5/2022 DMR AVG 0.174 0.174 0.084 0.084 29.2 29.2 < 5 2.5
Column Averages=> 0.128 0.058 24.2 2.5
Unpaired Site Specific RR=> 54.25% Unpaired Site Specific RR=> 89.66%
Literature/Default RR=> 79.00% Literature/Default RR=>�
0 % of data is BDL 50 % of data is BDL
RR for this HWA=> 54.25% RR for this HWA=> 89.66%
HWAATDesign June 2022 by Lori
Removal Rates
Page 8 of 20 pages
6/29/2022, 8:32 AM
Revision:August 1999

Town of Apex
Removal Rate Calculations
COD Total Pho horus
Influent Used in Effluent Used in Influent Used in Effluent Used in
Sample Date < mg/L Calculation < mg/L Calculation < mg/L Calculation < mg/L Calculation
2/5/2019 DMR AVG I 7.65 7.65 0.473 0.473
5/2019 DMR AVG 6.43 6.43 0.51 0.51
5/12/2019 LTMP
6/2019 DMR AVG 7.08 7.08 1.06 1.06
7/2019 DMR AVG 8.01 8.01 0.54 0.54
8/2019 DMR AVG 6.2 6.2 0.49 0.49
t.
8/11/2019 LTMP
9/2019 DMR AVG 7.32 7.32 1.19 1.19
10/2019 DMR AVG 5.84 5.84 0.12 0.12
11/2019 DMR AVG 5.93 5.93 0.1 0.1
11/5/2019 LTMP
12/2019 DMR AVG 5.44 5.44 0.11 0.11
1/2020 DMR AVG 4.45 4.45 < 0.1 0.05
2/2020 DMR AVG 3.53 3.53 0.104 0.104
2/3/2020 LTMP I 0.43 0.43
3/2020 DMR AVG 5.86 5.86 0.55 0.55
4/2020 DMR AVG 7.3 7.3 0.48 0.48
5/2020 DMR AVG 6.48 6.48 0.48 0.48
5/12/2020 LTMP
6/2020 DMR AVG 5.96 5.96 0.65 0.65
7/2020 DMR AVG 6.4 6.4 0.28 0.28
8/2020 DMR AVG 6.2 6.2 0.3 0.3
8/11/2020 LTMP I
9/2020 DMR AVG 5.58 5.58 0.47 0.47
10/2020 DMR AVG 5.4 5.4 0.45 0.45
11/2020 DMR AVG 5.3 5.3 0.09 0.09
11/5/2020 LTMP
12/2020 DMR AVG 5.4 5.4 0.104 0.104
1/2021 DMR AVG 4.3 4.3 0.355 0.355
2/2021 DMR AVG 3.5 3.5 0.95 0.95
2/3/2021 LTMP _
3/2021 DMR AVG 4.6 4.6 1.04 1.04
4/2021 DMR AVG 5.9 5.9 1.35 1.35
5/2021 DMR AVG 6.4 6.4 1.09 1.09
5/12/2021 LTMP
6/2021 DMR AVG 6.4 6.4 1.42 1.42
7/2021 DMR AVG 7.4 7.4 0.67 0.673
8/2021 DMR AVG 7.1 7.1 1.08 1.08
8/11/2021 LTMP
9/2021 DMR AVG 1 5.9 5.9 0.615 0.615
10/2021 DMR AVG 5.3 5.3 1.04 1.04
11/2021 DMR AVG 5.4 5.4 1.46 1.46
11/5/2021 LTMP
12/2021 DMR AVG 6.05 6.05 0.533 0.533
1/2022 DMR AVG 3.3 3.3 0.485 0.485
2/2022 DMR AVG 5.3 5.3 0.946 0.946
2/3/2022 LTMP if
3/2022 DMR AVG 6 6 0.888 0.888
4/2022 DMR AVG 4.5 4.5 0.523 0.523
5/2022 DMR AVG 593 37.7 7.5 7.5 1.53 1.53
Column Averages=> 5.86 0.641
Unpaired Site Specific RR=> Unpaired Site Specific RR=> 89.05%
Literature/Default RR=> Literature/Default RR=>�
of data is BDL 1 % of data is BDL
RR for this HWA=>I RR for this HWA=> 89.05%
HWAATDesign June 2022 by Lori
Removal Rates
Page 9 of 20 pages
6/29/2022, 8:32 AM
Revision:August 1999

I 1
Town of Apex
Removal Rate Calculations
Total Nit ogen
Influent Used in Effluent Used in
Sample Date < mg/L Calculation < mg/L Calculation
2/5/2019 DMR AVG 31.6 31.6 3.45 1 3.45
5/2019 DMR AVG 4.27 4.27
5/12/2019 LTMP 45.6 45.6
6/2019 DMR AVG 3.84 3.84
7/2019 DMR AVG 3.59 3.59
8/2019 DMR AVG 3.65 3.65
8/11/2019 LTMP 39.6 39.6
9/2019 DMR AVG 3.85 3.85
10/2019 DMR AVG 3.5 3.5
11/2019 DMR AVG 3.36 3.36
11/5/2019 LTMP 47.9 47.9
12/2019 DMR AVG 3.27 3.27
1/2020 DMR AVG 3.2 3.2
2/2020 DMR AVG 3.42 3.42
2/3/2020 LTMP 43.3 43.3
3/2020 DMR AVG 3.44 3.44
4/2020 DMR AVG 3.11 3.11
5/2020 DMR AVG 3.42 3.42
5/12/2020 LTMP 33.6 33.6
6/2020 DMR AVG 3.56 3.56
7/2020 DMR AVG 3.21 3.21
8/2020 DMR AVG 3.08 3.08
8/11/2020 LTMP 46.4 46.4
9/2020 DMR AVG 3.69 3.69
10/2020 DMR AVG
11/2020 DMR AVG 47.7 47.7 3.66 3.66
11/5/2020 LTMP
12/2020 DMR AVG
1/2021 DMR AVG
2/2021 DMR AVG 31.1 31.1 •1.08 4.08
2/3/2021 LTMP
3/2021 DMR AVG
4/2021 DMR AVG
5/2021 DMR AVG 51 51.0 4.48 4.48
5/12/2021 LTMP
6/2021 DMR AVG
7/2021 DMR AVG
8/2021 DMR AVG 86.5 86.5 4.22 4.22
8/11/2021 LTMP
9/2021 DMR AVG
10/2021 DMR AVG
11/2021 DMR AVG 54.0 54.0 4 4
11/5/2021 LTMP
12/2021 DMR AVG
1/2022 DMR AVG
2/2022 DMR AVG 22.4 22.4 3.83 3.83
2/3/2022 LTMP
3/2022 DMR AVG
4/2022 DMR AVG
5/2022 DMR AVG 50.6 50.6 4.23 4.23
Column Averages=> 45.1 3.66
Unpaired Site Specific RR=> 91.89%
Literature/Default RR=>I ,
0 % of data is BDL
RR for this HWA=> 91.89%
HWAATDesign June 2022 by Lori
Removal Rates
Page 10 of 20 pages
6/29/2022, 8:32 AM
Revision:August 1999

Apex WRF SIU Data
Tipper Tie SIU#0002
Sample Location: I FLOW BOD TSS AMMONIA 1111aillialiji
Tipper Tie I Used in Calculated Used in Calculated Used in Calculated Used in Calculated Used in Calculated
Sample Date ' MGD < mg/L Calculation lbs/day < mg/L Calculation lbs/day < m: Calculation lbs/day < mg/L Calculation lbs/day < mg/L Calculation lbs/day
2/7/2019 0.008389 88.2 85,2 6.17 32 0.22 0.69 0.69 0.05 < 0.005 0.0025 0,00 < 0.001 0.0005 0.00
2/12/2019 0.006822
1 3/20/2019 0.00834
4/16/2019 0.007799 .11 31 2.02 < 2.5 1.25 0.08 0.29 0.29 0.02 < 0.001 0.0005 0.00 < 0.001 0.0005 0.00
5/9/2019 ,l 0.009302 1^- 104 8.07 - 25 1.25 0.10 0.4 0.4 0.03 < 0.001 0.0005 0.00 < 0.001 0.0005 0.00
5/14/2019 i 0.008722
6/21/2019 a 0.006854
7/16/2019 0.010267 2_ _3 1.97 < 2.5 1.25 0.11 5 C 5 0.01 < 0.001 0.0005 0.00 < 0.001 0.0005 0.00
8/6/2019 t 0.007591 62 62 3.93 < 2.5 1.25 0.08 05S 0.58 0.04 < 0.001 0.0005 0.00 < 0.001 0,0005 0.00
8/22/2019 E 0.008331
9/26/2019 P
10/16/2019 ' 0 00507 120 < 2.5 0.68 < 0.001 < 0.001
11/7/2019 t 0 00031 141 141 7.42 < 2.5 1.25 0.07 0.46 0.46 0.02 < 0.001 0.0005 0.00 < 0.001 0.0005 0.00
11/19/2019 0.005987
12/11/2019 0.007656
1/14/2020 0.00763 61 61 3,88 < 2.5 1.25 0.08 1.3 1,3 0,08 < 0.001 0.0005 0.00 < 0.001 0,0005 0.00
1/29/2020 0.001344
2/6/2020 1 0.006779 54.1 54.1 3.06 < 25 125 0.07 0.193 0.193 0.01 < 0.001 0.0005 0.00 < 0.001 0,0005 0.00
2/11/2020 0.005432
3/17/2020 10.004854 123 123 4,98 < 2.5 1.25 0.05 0.611 0.611 0,02 ' 0.005 0.0025 0.00 < 0.001 0.0005 0.00
a
4/21/2020 t 0.004505 77 77 2.89 < 2.5 125 0.05 1.4 1.4 0.05 < 0.001 0.0005 0.00 < 0.001 0.0005 0.00
5/7/2020 0.005864 118 118 5.77 125 0.06 0.12 0,12 0.01 < 0.001 0.0005 0.00 < 0.001 0.0005 0.00
5/19/2020 0.008866
6/16/2020 0.00485
7/21/2020 0.000933 69 69 0.54 2,5 1.25 0,00 1.8 1.8 0.01 < 0001 0.0005 0.00 < 0.001 0.0005 0.00
8/13/2020 0.000646 266 266 1.43 < 2.5 1.25 4.35 4.35 0.02 < 0.001 0,0005 0.00 < 0.001 0.0005 0.00
9/15/2020 0.001478
9/16/2020 0.001574,
10/15/2020 0.001735 84 84 1.22 < 2.5 1.25 0,02 1.3 1.3 0.02 < 0.001 0.0005 0.00 < 0.001 0.0005 0.00
11/5/2020 0.001457 310 310 3.77 < 2.5 1.25 1.3 1.3 0.02 < 0.001 0.0005 0.00 < 0.001 0.0005 0.00
11/19/2020 0.001036
12/8/2020 0.001563
1/12/2021 0.006896 71 71 4.08 < 2.5 1.25 0.07 1.8 1.8 0.10 < 0.001 0.0005 0.00 < 0.001 0.0005 0.00
2/4/2021 t 0.008642 52.1 52.1 3,76 < 2.5 1.25 0.09 0.67 0.67 0.05 < 0.001 0,0005 0.00 < 0.001 0.0005 0.00
2/17/2021 t 0.000364
3/16/2021 0.006587 �^
3/26/2021 0.002149
4/7/2021 0.008191 64 64 4.37 < 2.5 1.25 0.09 .. 056 0,04 < 0.001 0.0005 0.00 < 0.001 0.0005 0.00
5/4/2021 0.009481
5/6/2021 ' 0.008848 77.6 77.6 5.73 < 2.5 1.25 0.09 0.477 0.477 0.04 < 0.001 0,0005 0.00 < 0.001 0.0005 0.00
6/10/2021 0.00429
7/2/2021 0.00107 76 76 0.68 < 2.5 1.25 0,01 0.61 0.61 0.01 < 0.001 0.0005 0,00 - 0.001 0.0005 0.00
8/5/2021 0.002435
8/12/2021 0.002624 53.6 53.6 1 1.17 < 2.5 1.25 0.03 0 118 0.118 0.00 < 0.001 0,0005 0,00 - 0.001 0.0005 0.00
8/13/2021 0.000706
9/15/2021 0.001771
10/12/2021 0.002154 79 1.42 < 2.5 1.25 0.02 0 0 0.00 <' 0.001 0.0005 0.00 < 0.001 0,0005 0.00
11/4/2021 0.001573 2CI 124 1.63 7n "2.• 1.25 0.02 0 10 019 0.00 < 0.001 0.0005 0.00 < 0.001 0.0005 0.00
11/16/2021 t 0.001355
12/8/2021 0.000635
1/10/2022 0.007659 65 4.15 - 2.5 1.25 0.08 1.3 1.3 0.08 < 0.0005 0,00025 0.00 < 000036 0,00018 0.00
r.
2/7/2022 0.008136
2/23/2022 0.004626
2/28/2022 0.008637
3/8/2022 0.008711
3/16/2022 0.01233 .23 123 12.65 < 2.5 1,25 0.13 0.61 0.61 0.06 < 0.005 0.0025 0.00 < 0.00036 0.00018 0.00
4/11/2022 0.006119 S' 87 4.44 < 2,5 1.25 0.06 -25/ 0,39 0.02 < 0.00047 0.000235 0.00 < 0.00036 0.00018 0.00
5/10/2022 0.005334 II.: 114 5.07 < 2.5 125 0.06 ,.1. 0.11 0.00 < 0.005 0.0025 0.00 < 0.001 0.0005 0.00
5/16/2022 0.005314
Column Averages=> I 0.005.0, I I 96.2 I 4.25 I I 1.32 I 0.06 I I 0.81 I 0.036 I I 0.0008 I 0.0000 I I 0.0005 I 0.0000 I
0002
Page 1 of 4

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Apex WRF SIU Data
Tipper Tie SIU#0002
Sample Location: I FLOW 'temperature COD Total Nitrogen
Tipper Tie I Used in Calculated Used in Calculated Used in Calculated
Sample Date MGD < mg/L Calculation lbs/day < mg/L Calculation lbs/day < mg/L Calculation lbs/day
2/7/2019 0.008389 23.6 257 257 17.9808 7.1 7.1 0.4967
2/12/2019 0.006822 22.7
3/20/2019 0.00834 20.7
4/16/2019 0.007790 20.8 110 110 7.1548 1.6 1.6 0.1041
5/9/2019 0.009302 25.9 387 387 30.0229 10.09 10.09 0.7828
5/14/2019 0.008722 25.4
6/21/2019 9.006854 31.4
7/16/2019 ° 0.0:02a7 31.9 190 190 16.2691 5 2 5.2 0.4453
8/6/2019 r 0 007591' 28.1 228 228 14.4344 7.2 7.2 0.4558
8/22/2019 0.008331 29.4
9/26/2019 t, 0.007207 30.4
10/16/2019 ' 0.00597 22.7 410 72
11/7/2019 t 0 00631 196 733 733 38.5744 281 28.1 1.4788
11/19/2019 ,, 0005987 20.3
12/11/2019 0.007656 22.5Il 11 0.7024
1/14/2020 1 0.00763 23.8 370 370 23.5447 9.4 9.4 0.5982
1/29/2020 0.001344 16
2/6/2020 0.006779 2 3 7 270 270 15.2650 7.22 7.22 0.4082
2/11/2020 ; 0.005432, 23.1
3/17/2020 10.004854) 18.9 283 283 11.4565 7.39 7.39 0.2992
4/21/2020 t 0.004505 17.8 440 16.5315 10 10 0.3757
5/7/2020 ; 0.005864 20.2 392 392 19.1711 14.5 14.5 0.7091
5/19/2020 t 0.008866 27.3
6'16/2020 I 0.00485 20.1
7/21/2020 0.000933 29.1 740 740 5.7581 17.05 17.05 0.1327
8/13/2020 0 000646 29.7 San 846 4.5579 31 31 0.1670
915/2020 0.001478 30.8
9/16/2020 0.001574 29.9
10/15/2020 0.001735 26.2 460 460 6.6562 12 12 0.1736
11/5/2020 0.001457 29.3 758 758 9.2107 13.4 13.4 0.1628
11/19/2020 0.001036 28.4
12/8/2020 , 0.001563 26'
I/12/2021 0.006896 16.5 480 480 27.6061 14.00 14 0.8052
2/4/2021 0.008642 26.1 342 342 24.6494 8.90 8.9 0.6415
a
2/17/2021 1 0.000364 18.6
3/16/2021 10.006,82 20.8
3/26/2021 0.002149 21.1
4/7/2021 0.008191 23.7 330 330 22.5433 8.50 8.5 0.5807
5/4/2021 0.009481 26.1
5/6/2021 0.008848 26.1 326 326 24.0563 0.70 8.7 0.6420
6/10/2021 0.00429 28.7
7/2/2021 0.00107 28.4 380 380 3.3910 9.5 9.5 0.0848
8/5/2021 c 0.002435 28.9
8/l2/2021 0.002624 27.6 182 182 39829 1.36 1.36 0.0298
8/13/2021 ° 0.000706 285
9/15/2021 t 0.001771 26.9
10/12/2021 r 0.002154 23.6 300 300 5.3893 5 5 0.0898
11/4/2021 ' 0.001573 26.5 340 340 4.4604 6 SS 6.88 0.0903
11/16/2021 10.001355 21.0
12/8/2021 0.000635 20.8
1/10/2022 0.007659 13.9 310 310 19.8016 S 85 8.85 0.5653
2/7/2022 0.008136 14.7
2/23/2022 0.004626 20.7
2/28/2022 ,0.008637 18.0
3/8/2022 0.008711 20.3
3/16/2022 0.01233 18.8 ' 7.3 73 0.7507
4/11/2022 0.0061 19 15.9 320 320 16.33,1 0_ 8.7 0.4440
5/10/2022 0.00533. 209 290 290 12.4099 -_2 7.15 0.3181
5/16/2022 0.00531.1 22.7
Column Averages=> 10.00530 I I I I I 387.1 I 17.11 I I 10.3 I 0.4533
0002
Page 4 of 4

Apex WRF SIU Data
Tipper Tie SIU #0010
Sample Location: FLOW BOD AMMONIA
Tipper Tie II Used in Calculated Used in Calculated Used in Calculated
Sample Date j MGD mg/L Calculation lbs/day < mg/L Calculation lbs/day < mg/L Calculation lbs/day°
6/18/2020 30.002572 140 140 3.0031 < 2.5 1.25 0.0268 0.6 0.6 0.0129_
7/21/2020 0.000933 69 69 0.54 < 2.5 1.25 0.01 1.8 1.8 0.01
8/13/2020 ` 0.000646' 266 266 1.43 < 2.5 1.25 0.01 4.35 4.35 0.02
9/15/2020 0.001478
9/16/2020 0.001574.
10/15/2020 0.001735 84 84 1.22 < 2.5 1.25 0.02 1.3 1.3 0.019
11/5/2020 0.001457 310 310 3.77 < 2.5 1.25 0.02 1.3 1.3 0.016
11/19/2020 0.001036
12/8/2020 0.001563
1/12/2021 0.001536 36 36 0.05 < 2.5 0 0.00 0.86 0.86 0.01
2/4/2021 ' 0.001442 221 221 2.66 < 2.5 0 0.00 0.77 0.77 0.01
2/17/2021 0.001075
3/18/2021 ' 0.002102
4/9/2021 0.001484 100 100 1.24 < 2.5 0 0.00 0.78 0.78 0.01
5/6/2021 0.002112 147 147 2.59 < 2.5 0 0.00 0.136 0.136 0.00
5/11/2021 )0.001857 _
6/8/2021 0.002081
7/2/2021 0.00107 76 76 0.68 < 2.5 0 0.00 0.61 0.61 0.01
8/5/2021 0.002435
8/12/2021 1 0.002624 53.6 53.6 1.17 < 2.5 0 0.00 0.118 0.118 0.00
8/13/2021 0.000706
9/15/2021 0.001771
10/12/2021 0.002154 79 79 1.42 < 2.5 0 0.00 < 0.1 0.05 0.00
1 1/4/2021 0.001573 124 124 1.63 < 2.5 0 0.00 0.19 0.19 0.00
11/16/2021 0.001355
12/8/2021 0.000635
a . .---.
Column Averages=> 0.00158 131 1.73 0.48 0.01 0.99 0.013
0010
Page 1 of 5

Apex WRF SIU Data
Tipper Tie SIU #0010
ARSENIC CADMIUM C IROMIUM •
Used in Calculated Used in Calculated Used in Calculated Used in Calculated
i
< mg/L Calculation lbs/day < mg/L Calculation lbs/day < mg/L Calculation lbs/day < mg/L Calculation lbs/day
< 0.001 0.0005 0.0000 < 0.001 0.0005 0.0000 < 0.001 0.0005 0.0000 0.007 0.007 0.00015
< 0.001 0.0005 0.0000 < 0.001 0.0005 0.0000 0.001 0.001 0.0000 0.002 0.002 0.00002 ,
< 0.005 0.0025 0.0000 < 0.001 0.0005 0.0000 < 0.001 0.0005 0.0000 0.005 0.005 0.00003
< 0.001 0.0005 0.0000
< 0.001 0.0005 0.0000
< 0.005 1 0.0025 0.00 < 0.001 0.0005 0.00 0.002 0.002 0.00 0.005 0.005 0.00007
< 0.005 0.0025 0.00 < 0.001 0.0005 0.00 < 0.005 0.0025 0.00 0.016 0.016 0.00019
< 0.001 _ 0.0005 0.00 0.003 0.003 0.00003
< 0.001 0.0005 0.00 0.019 0.019 0.00025
< 0.005 0.0025 0.00 < 0.001 0.0005 0.00 < 0.001 0.002 0.00
< 0.005 0.0025 0.00 < 0.001 0.0005 0.00 < 0.005 0.0025 0.00
< 0.001 0.0005 0.00
< 0.001 0.0005 0.00_
< 0.005 0.0025 0.00 < 0.001 0.0005 0.00 < 0.001 0.0005 0.00 0.006 0.006 0.00
< 0.005 0.0025 0.00 < 0.001 0.0005 0.00 < 0.005 0.0025 0.00 0.009 0.009 0.00
< 0.001 0.0005 0.00
< 0.001 0.0005 0.00
< 0.005 0.0025 0.00 < 0.001 0.0005 0.00 < 0.001 0.0005 0.00 0.005 0.005 0.00
0.00 < 0.005 0.0025 0.00
< 0.005 0.0025 0.00 < 0.001 0.0005 0.00 < 0.001 0.0005 0.00 0.007 0.007 0.00
0.00 < 0.001 0.0005 0.00
< 0.001 0.0005 0.00
< 0.005 0.0025 0.00 < 0.001 0.0005 0.00 < 0.001 0.0005 0.00 0.001 0.001 0.00
< 0.005 0.0025 0.00 < 0.001 0.0005 0.00 < 0.005 0.0025 0.00 0.003 0.003 0.00
< 0.001 0.0005 0.00
< 0.001 0.0005 0.00
0.0022 0.0000 0.0005 0.0000 0.0010 0.0000 0.0068 0.0001
0010
Page 2 of 5

Apex WRF SIU Data
Tipper Tie SIU#0010
CYANIDE LEAD
Used in Calculated Used in Calculated Used in Calculated Used in Calculated
< mg/L Calculation lbs/day < mg/L Calculation lbs/day < mg/L Calculation lbs/day < mg/L Calculation lbs/day
< 0.005 0.0025 0.0001 < 0.01 0.005 0.0001 < 0.0002 0.0001 0.00000 0.656 0.656 0.0141
< 0.005 0.0025 0.0000 < 0.01 0.005 0.0000 < 0.0002 0.0001 0.00000 1.93 1.93 0.0150
< 0.005 0.0025 0.0000 < 0.01 0.005 0.0000 < 0.0002 0.0001 0.00000 1.87 1.87 0.0101
< 0.005 0.0025 0.0000
< 0.005 0.0025 0.0000
< 0.005 0.0025 0.00 < 0.01 0 0.0000 < 0.0002 0.0001 0.0000 0.857 0.857 0.0124
< 0.005 0.0025 0.00 < 0.01 0 0.0000 < 0.0002 1 0.0001 0.0000 1.66 1.66 0.0202
< 0.005 0.0025 0.00
< 0.005 0.0025 0.00
< 0.005 0.0025 0.00 < 0.01 0 0.0000 < 0.0002 0.00010 0.00000 2.11 2.11 0.0270
< 0.005 0.0025 0.00 0.006 0.006 0.0001 < 0.0002 1 0.00010 0.00000 1.68 1.68 0.0202
< 0.005 0.0025 0.00
< 0.005 0.0025 0.00
< 0.005 0.0025 0.00 < 0.01 0 0.0000 < 0.0002 0.00010 0.00000 0.247 0.247 0.0031
0.011 0.011 0.00019 < 0.01 0 0.0000 < 0.0002 0.00010 0.00000 0.522 0.522 0.0092
< 0.005 0.0025 0.00 < 0.01 0.005 0.0000 < 0.0002 0.0001 0.00000 1.09 1.09 0.0097
< 0.005 0.0025 0.00
< 0.005 0.0025 0.00 < 0.01 \. 0.005 0.0001 < 0.0002 0.0001 0.00000 0 0 0.0000
< 0.005 0.0025 0.00
< 0.005 0.0025 0.00 < 0.01 0.005 0.0001 < 0.0002 0.0001 0.00000 0.088 0.088 0.0016
< 0.005 0.0025 0.00 < 0.01 0.005 0.0001 < 0.0002 0.0001 0.00000 0.602 0.602 0.0079
< 0.005 0.0025 0.00
< 0.005 I 0.0025 0.00
0.0029 0.0000 0.003 0.0000 0.0001 0.00000 1.02 0.0135
0010
Page 3 of 5

Apex WRF SIU Data
Tipper Tie SIU #0010
NICKEL ZINC 01 &GREASE pH
Used in Calculated Used in Calculated Used in Calculated Used in Calculated
< mg/L Calculation lbs/day < mg/L Calculation lbs/day < mg/L Calculation lbs/day < mg/L Calculation lbs/day
< 0.01 0.005 0.0001 0.033 0.033 0.0007 12.2 12.2 0.2617 5.8
< 0.01 0.005 0.0000 0.078 0.078 0.0006 5.49 5.49 0.0427 6.3
< 0.01 0.005 0.0000 0.104 0.104 0.0006 < 5 2.5 0.0135 6.57
0.06 0.06 0.0007 < 5 2.5 0.0308 5.9
0.04 0.04 0.0005 < 5 2.5 0.0328 6.0
< 0.01 0.005 0.0001 0.039 0.039 0.0006 < 5 2.5 0.0362 6.1
< 0.01 0.005 0.0001 0.048 0.048 0.0006 < 5 2.5 0.0304 6.3
0.077 0.077 0.0007 < 5 2.5 0.0216 5.7
0.027 0.027 0.0004 13.1 13.1 0.1708 6.5
< 0.01 0.005 0.0000 0.048 0.048 0.0006 < 5 2.5 0.0320 6.7
< 0.01 0.005 0.0000 0.044 0.044 0.0005 < 5 2.5 0.0301 6.85
0.093 0.093 0.0008 < 5 2.5 0.0224 6.5
0.024 0.024 0.0004 7.52 7.52 0.1318 6.7 ,
< 0.01 0.005 0.0000 0.017 0.017 0.0002 < 5 2.5 0.0309 6.9
< 0.01 0.005 0.0000 0.033 0.033 0.0006 < 5 2.5 0.0440 6.11
11111,
0.0300 0.03 0.0005 < 5 2.5 0.0387 6.6
0.031 0.031 0.0005 < 5 2.5 0.0434 6.1
< 0.01 0.005 0.0000 0.026 0.026 0.0002 < 5 2.5 0.0223 6
0.016 0.016 0.0003 < 5 2.5 0.0508 5.9
< 0.01 0.005 0.0001 0.023 0.023 0.0005 < 5 2.5 0.0547 6.59
6.5
0.038 0.038 0.0006 < 5 2.5 0.0369 6.1
< 0.01 0.005 0.0001 0.011 0.011 0.0002 6.23 6.23 0.1119 6.1
< 0.01 0.005 0.0001 0.036 0.036 0.0005 < 5 2.5 0.0328 6.51
0 0 0.0000 < 5 2.5 0.0283 6.4
111/111,
0.017 0.017 0.0001 < 5 2.5 0.0132 6.6
0.005 0.0001 0.040 0.0005 3.78 0.0497
0010
Page 4 of 5

Apex WRF SIU Data
Tipper Tie SIU #0010
Total Phosphorus Temperature COD Total Nitrogen
Used in Calculated Used in Calculated Used in Calculated Used in Calculated
< mg/L Calculation lbs/day < mg/L Calculation lbs/day < mg/L Calculation lbs/day < mg/L Calculation lbs/day
0.1 0.05 0.0011 27.5 520 520 11.1542 9.1 9.1 0.1952
0.16 0.16 0.0012 29.1 740 740 5.7581 17.05 17.05 0.1327
< 0.10 0.05 0.0003 29.7 846 846 4.5579 31 31 0.1670
30.8
29.9
< 0.1 0.05 0.0007 26.2 460 460 6.6562 12 12 0.1736
0.1 0.05 0.0006 29.3 758 758 9.2107 13.4 13.4 0.1628
28.4
26.7
0.11 0.11 0.0014 23.3 710 710 9.0953 14 14 0.1793
< 0.1 0.05 0.0006 26.1 657 n 657 7.9013 15.8 15.8 0.1900
26.9
25.7
0.1 0.05 0.0006 24.7 350 350 4.3318 7.4 7.4 0.0916
0.1 0.05 0.0009 27.4 407 407 7.1689 5.6 5.6 0.0986
27.3
28
< 0.1 0.05 0.0004 28.4 380 380 3.3910 9.5 9.5 0.0848
28.9
0.1 0.05 0.0011 27.6 182 182 3.9829 1.36 1.36 0.0298
28.5
26.9
0.1 0.05 0.0009 23.6 300 300 5.3893 5 5 0.0898
0.15 0.15 0.0020 26.5 340 340 4.4604 6.88 6.88 0.0903
21
20.8
0.071 0.001 512 6.73 11.4
0010
Page 5 of 5

UNCONTROLABLE LTMP DATA
'Sample Location: I FLOW BOD AMMONIA
UNCONTROLABLE Used in Calculated Used in Calculated Used in Calculated
Sample Date I mg/L < mg/L Calculation lbs/day < mg/L Calculation lbs/day < mg/L Calculation lbs/day
2/6/2019 338 338 0 676 676 0 44.7 44.7 0
5/7/2019 171 171 0 284 284 0 43.4 43.4 0
8/6/2019 323 323 0 360 360 0 50 50 0
11/5/2019 229 229 0 228 228 0 74.3 74.3 0
2/4/2020 337 337 0 452 452 0 50.8 50.8 0
5/5/2020 430 430 0 588 588 0 15 45 0
8/11/2020 239 239 0 623 623 0 50.2 50.2 0
11/3/2020 291 291 0 420 420 0 64.1 64.1 0
2/2/2021 290 290 0 440 440 0 29.5 29.5 0
5/3/2021 244 244 0 332 332 0 51 51 0
8/3/2021 173 173 0 354 354 0 53.3 53.3 0
11/2/2021 503 503 0 388 388 0 61.6 61.6 0
2/1/2022 161 161 0 460 460 0 70.1 70.1 0
5/3/2022 183 183 0 140 140 0 44.5 44.5 0
Column Averages=> I 279 I 0 I I__410 0 1 52 I 0 I

UNCONTROLABLE LTMP DATA
Sample Location: 'DMIUM CUROMIUM •
UNCONTROL:\I31.11 Used in Calculated Used in Calculated Used in Calculated Used in Calculated
Sample Date < tng/L Calculation Ibs/day < mg/L Calculation lbs/day < mg/L Calculation lbs/day < mg/L Calculation lbs/day
2'6/2019 < 0.005 0.0025 0.000 < 0.001 0.0005 0.000 0.009 0.009 0.000 0.054 0.054 0.000
5/7/2019 < 0.005 0.0025 0.000 < 0.001 0.0005 0.000 0.006 0.006 0.000 0.045 0.045 0.000
8/6/2019 < 0.005 0.0025 0.000 < 0.001 0.0005 0.000 0.007 0.007 0.000 0.051 0.051 0.000
11/5/2019 < 0.005 0.0025 0.000 < 0.001 0.0005 0.000 < 0.005 0.0025 0.000 0.029 0.029 0.000
2/4/2020 < 0.005 0.0025 0.000 < 0.001 0.0005 0.000 0.007 0.007 0.000 0.051 0.051 0.000
5/5/2020 c 0.005 0.0025 0.000 < 0.001 0.0005 0.000 0.011 0.011 0.000 0.056 0.056 0.000
8/11/2020 < 0.005 0.0025 0.000 < 0.001 0.0005 0.000 0.007 0.007 0.000 0.062 0.062 0.000
11/3/2020 < 0.005 0.0025 0.000 < 0.001 0.0005 0.000 0.006 0.006 0.000 0.049 0.049 0.000
2/2/2021 < 0.005 0.0025 0.000 < 0.001 0.0005 0.000 < 0.005 0.0025 0.000 0.034 0.034 0.000
5/3/2021 < 0.005 0.0025 0.000 < 0.001 0.0005 0.000 < 0.005 0.0025 0.000 0.033 0.033 0.000
8/3/2021 < 0.005 0.0025 0.000 < 0.001 0.0005 0.000 0.015 0.015 0.000 0.071 0.071 0.000
11/2/2021 < 0.005 0.0025 0.000 < 0.001 0.0005 0.000 0.020 0.02 0.000 0.040 0.04 0.000
2/1/2022 < 0.005 0.0025 0.000 < 0.001 0.0005 0.000 0.010 0.01 0.000 0.079 0.079 0.000
5/3/2022 < 0.005 0.0025 0.000 < 0.001 0.0005 0.000 0.012 0.012 0.000 _ 0.026 0.026 0.000
Column Averages=> 0.0025 0.0000 0.0005 0.0000 0.0084 0.0000 0.0486 { 0.0000

UNCONTROLABLE LTMP DATA
'Sample Location: ] CYANIDE LEAD MERCURY MOLYBDENUM
UNCONTROLABLE I Used in Calculated Used in Calculated Used in Calculated Used in Calculated
Sample Date < mg/L Calculation lbs/day < mg/L Calculation lbs/day < ug/L Calculation lbs/day < mg/L Calculation lbs/day
2/6/2019 < 0.005 0.0025 0.000 < 0.005 0.0025 0.000 0.2 0.2 0.000 < 0.005 0.0025 0.000
5/7/2019 < 0.005 0.0025 0.000 < 0.005 0.0025 0.000 < 0.2 0.1 0.000 < 0.005 0.0025 0.000
8/6/2019 < 0.005 0.0025 0.000 < 0.005 0.0025 0.000 < 0.2 0.1 0.000 < 0.005 _ 0.0025 0.000
11/5/2019 < 0.005 0.0025 0.000 < 0.005 0.0025 0.000 < 0.2 0.1 0.000 < 0.005 0.0025 0.000
2/4/2020 < 0.005 0.0025 0.000 < 0.005 0.0025 0.000 < 0.2 0.1 0.000 < 0.005 0.0025 0.000
5/5/2020 < 0.005 0.0025 0.000 < 0.005 0.0025 0.000 < 0.2 0.1 0.000 < 0.005 0.0025 0.000
8/11/2020 < 0.005 0.0025 0.000 < 0.005 0.0025 0.000 < 0.2 0.1 0.000 < 0.005 0.0025 0.000
11/3/2020 < 0.005 0.0025 0.000 < 0.005 0.0025 0.000 < 0.2 0.1 0.000 < 0.005 0.0025 0.000
2/2/2021 < 0.005 0.0025 0.000 < 0.005 0.0025 0.000 < 0.2 0.1 0.000 < 0.005 0.0025 0.000
5/3/2021 < 0.005 0.0025 0.000 < 0.005 0.0025 0.000 < 0.2 0.1 0.000 < 0.005 0.0025 0.000
8/3/2021 < 0.005 0.0025 0.000 < 0.005 0.0025 0.000 < 0.2 0.1 0.000 < 0.005 0.0025 0.000
11/2/2021 < 0.005 0.0025 0.000 < 0.005 0.0025 0.000 < 0.2 0.1 0.000 < 0.005 _ 0.0025 0.000
2/1/2022 < 0.005 0.0025 0.000 < 0.005 0.0025 0.000 < 0.2 0.1 0.000 < 0.005 0.0025 0.000
5/3/2022 < 0.005 0.0025 0.000 < 0.005 0.0025 0.000 < 0.2 0.1 0.000 1 < 0.005 0.0025 0.000
Column Averages=> 0.0025 0.0000 0 0025 0.0000 ug/L 0.1071 0.0000 0.0025 0.0000

UNCONTROLABLE LTMP DATA
Sample Location:
UNCONTROLABLE I Used in Calculated Used in Calculated Used in Calculated Used in Calculated
Sample Date I < mg/L Calculation lbs/day < mg/L Calculation lbs/day < mg/L Calculation lbs/day < mg/L Calculation lbs/day
2/6/2019 0.015 0.015 0.000 < 0.01 0.005 0.0000 < 0.005 0.0025 0.000 0.260 0.26 0.000
5/7/2019 0.01 0.005 0.000 < 0.01 0.005 0.0000 < 0.001 0.0005 0.000 0.166 ' 0.166 0.000
8/6/2019 0.015 0.015 0.000 < 0.01 0.005 0.0000 < 0.001 0.0005 0.000 0.252 0.252 0.000
11/5/2019 < 0.01 0.005 0.000 < 0.01 0.005 0.0000 < 0.001 0.0005 0.000 0.153 0.153 0.000
2/4/2020 0.013 0.013 0.000 < 0.01 0.005 0.0000 < 0.001 0.0005 0.000 0.185 0.185 0.000
5/5/2020 0.016 0.016 0.000 < 0.01 0.005 0.0000 < 0.001 0.0005 0.000 0.301 0.301 0.000
8/11/2020 0.028 0.028 0.000 < 0.01 0.005 0.0000 < 0.005 0.0025 0.000 0.285 0.285 0.000
11/3/2020 0.01 0.01 0.000 < 0.01 0.005 0.0000 0.022 0.022 0.000 0.163 0.163 0.000
2/2/2021 < 0.01 0.005 0.000 < 0.01 0.005 0.0000 < 0.005 0.0025 0.000 0.151 0.151 0.000
5/3/2021 0.13 0.13 0.000 < 0.01 0.005 0.0000 < 0.005 0.0025 0.000 0.134 0.134 0.000
8/3/2021 0.23 0.23 0.000 < 0.01 0.005 0.0000 < 0.001 0.0005 0.000 0.114 0.114 0.000
11/2/2021 0.032 0.032 0.000 < 0.01 0.005 0.0000 0.006 0.006 0.000 0.581 0.581 0.000
2/1/2022 0.015 0.015 0.000 < 0.01 0.005 0.0000 < 0.001 0.0005 0.000 0.201 0.201 0.000
5/3/2022 0.01 0.01 0.000 < 0.01 0.005 0.0000 < 0.001 0.0005 0.000 0.085 0.085 0.000
Column Averages=> 0.0378 0.0000 0.0050 0.0000 0.0030 0.0000 0.2165 0.0000

UNCONTROLABLE LTMP DATA
'Sample Location: I OIL&GREASE Total N COD
UNCONTROLABLE I Used in Calculated ,Used in Calculated Used in Calculated Used in Calculated
Sample Date 1 < mg/I. Calculation lbs/day < mg/L Calculation lbs/day < mg/L Calculation lbs/day < tng/1_ Calculation lbs/day
2/6/2019 20 20 0.000 13.8 13.8 0.0000 95.3 95.3 0.0000 089 889 0.000
5/7/2019 18 18 0.000 8.34 8.34 0.0000 47.8 47.8 0.0000 779 779 0.000
8/6/2019 16 16 0.000 9.9 9.9 0.0000 49.2 49.2 0.0000 832 832 0.000
11/5/2019 26 26 0.000 13.8 13.8 0.0000 58.8 58.8 0.0000 606 606 0.000
2/4/2020 28.4 28.4 0.000 8.09 8.09 0.0000 62.4 62.4 0.0000 879 879 0.000
5/5/2020 21.6 21.6 0.000 9.81 9.81 0.0000 59.8 59.8 0.0000 978 978 0.000
8/11/2020 14 14 0.000 11.4 11.4 0.0000 59.3 59.3 0.0000 987 987 0.000
11/3/2020 372 37.2 0.000 9.16 9.16 0.0000 65.3 65.3 0.0000 647 647 0.000
2/2/2021 11.3 11.3 0.000 5.97 5.97 0.0000 44.1 44.1 0.0000 745 745 0.000
5/3/2021 9 9 0.000 I1.2 11.2 0.0000 78.7 78.7 0.0000 735 735 0.000
8/3/2021 12.3 12.3 0.000 8.1 8.1 0.0000 76.9 76.9 0.0000 468 468 0.000
11/2/2021 20.4 20.4 0.000 5.36 5.36 0.0000 55.68 55.68 0.0000 624 624 0.000
2/1/2022 18.8 18.8 0.000 7.05 7.05 0.0000 79.2 79.2 0.0000 909 909 0.000_
5/3/2022 27.8 27.8 0.000 5.65 51.4 51.4 0.0000 467 467 0.000
Column Averages=> 120.0571 I 0.0000 I 9.3831 0.0000 63.1343 0.0000 753.2143 0.0000

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DITCH LTMP DATA 1
'Sample Location: I CYANIDE LEAD MOLYBDENUM
DITCH I Used in Calculated Used in Calculated Used in Calculated Used in Calculated
Sample Date grab I < mg/L Calculation lbs/day < mg/L Calculation lbs/day < ug/L Calculation lbs/day < mg/L Calculation lbs/day
8/6/2019 I< 0.005 0.0025 0.000 0.012 0.012 0.000 0.012 0.012 0.000
2/4/2020 1< 0.005 0.0025 0.000 0.020 0.02 0.000 0.41 0.41 0.000
8/11/2020 < 0.005 0.0025 0.000 0.01 0.01 0.000 0.27 0.27 0.000
2/2/2021 <. 0.005 0.0025 0.000 0.012 0.012 0.000 0.23 0.23 0.000
8/3/2021 < 0.005 0.0025 0.000 < 0.005 0.0025 0.000 0.38 0.38 0.000
2/1/2022 <, 0.005 0.0025 0.000 0.005 0.005 0.000 0.23 0.23 0.000
Column Averages=> 0.003 0 0.010 0 0.255 0

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DITCH LTMP DATA
Sample Location: I 01 z GREASE Total N COD
DITCH Used in CaIc:/eted Used in Calculated Used in Calculated Used in Calculated
, Sample Date gab I < mg/L Calculation 1 s da. m,:I. Calculation lbs < mg L Calculation lbs/day mg/L Calculation lbs/day
8/6/2019
2/4/2020
8/11/2020
2/2/2021
8/3/202 I
2/1/2022
Colman Averages r

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INFLUENT LTMP DATA
!Sample Location: I ARSENIC C'DMIUM CHROMIUM •'
INFLUENT Used in Calculated Used in Calculated Used in Calculated Used in Calculated
_
Sample Date I < mg/L Calculation lbs/day < mg/L Calculation lbs/day < mg/L Calculation lbs/day < mg/L Calculation lbs/day
2/5/2019 < 0.005 0.0025 I 0.0328 < 0.001 0.0005 0.0066 < 0.005 0.0025 0.0328 0.027 0.027 0.3540
5/7/2019 < 0.005 0.0025 0.0256 < 0.0005 0.00025 0.0026 < 0.005 0.0025 0.0256 0.038 0.038 0.3898
8/6/2019 < 0.005 , 0.0025 0.0281 < 0.0005 0.00025 0.0028 < 0.005 0.0025 0.0281 0.025 0.025 0.2811
11/5/2019 < 0.005 0.0025 0.0221 < 0.0005 0.00025 0.0022 < 0.005 0.0025 0.0221 0.024 0.024 0.2120
2/4/2020 < 0.005 0.0025 0.0286 < 0.0005 0.00025 0.0029 < 0.005 0.0025 0.0286 0.026 0.026 0.2971
5/5/2020 < 0.005 0.0025 0.0248 < 0.0005 0.00025 0.0025 < 0.005 0.0025 0.0248 0.025 0.025 0.2477
8/11/2020 < 0.005 0.0025 0.0233 < 0.0005 0.00025 0.0023 < 0.005 0.0025 0.0233 0.030 0.03 0.2795
11/3/2020 < 0.005 0.0025 0.0227 < 0.0005 0.00025 0.0023 < 0.005 0.0025 0.0227 0.031 0.031 0.2818
2/2/2021 < 0.005 0.0025 0.0368 < 0.0005 0.00025 0.0037 < 0.005 0.0025 0.0368 0.017 0.017 0.2502
5/3/2021 0.008 0.008 0.0735 < 0.0005 0.00025 0.0023 < 0.005 0.0025 0.0230 0.048 0.048 0.4408
8'3'2021 < 0.005 0.0025 0.0209 < 0.0005 0.00025 0.0021 < 0.005 1 0.0025 0.0209 0.003 0.003 0.0251
11/2/2021 < 0.005 _ 0.0025 0.0252 < 0.0005 0.00025 0.0025 < 0.005 0.0025 0.0252 0.026 0.026 0.2626
2/1/2022 < 0.005 0.0025 0.0266 < 0.0005 0.00025 0.0027 < 0.005 0.0025 0.0266 0.029 0.029 0.3086
5/3/2022 < 0.005 0.0025 0.0239 < 0.0005 0.00025 0.0024 0.016 0.016 0.1532 0.03 0.03 0.2872
1
Column Averages=>� , 0.0029 0.02964 T 0.0003 0.0028 I 0.0035 0.0353 I 0.0271 0.27981

1
INFLUENT LTMP DATA
Sample Location: CYANIDE LEAD MOLYBDENUM
INFLUENT Used in Calculated Used in Calculated Used in Calculated Used in Calculated
Sample Date I < mg/L Calculation lbs/day < mg/L Calculation lbs/day < ng/L Calculation lbs/day < ing/L Calculation lbs/day
2/5/2019 < 0.005 0.0025 0.0328 < 0.005 0.0025 0.0328 20.0 20.0 0.0003 < 0.005 0.0025 0.0328
5/7/2019 < 0.005 0.0025 0.0256 < 0.005 0.0025 0.0256 2.9 2.9 0.0000 < 0.005 0.0025 0.0256
8/6/2019 < 0.005 0.0025 0.0281 < 0.005 0.0025 0.0281 < 0.5 0.3 0.0000 <r 0.005 0.0025 0.0281
11/5/2019 < 0.005 0.0025 0.0221 < 0.005 0.0025 0.0221 < 2.5 1.3 0.0000 < 0.005 0.0025 0.0221
2/4/2020 < 0.005 0.0025 0.0286 < 0.005 0.0025 0.0286 6.3 6.25 0.0001 < 0.005 0.0025 0.0286
5/5/2020 < 0.005 0.0025 0.0248 < 0.005 0.0025 0.0248 < 2.5 1.25 0.0000 < 0.005 0.0025 0.0248
8/11/2020 < 0.005 0.0025 0.0233 < 0.005 0.0025 0.0233 4.7 4.7 0.0000 < 0.005 0.0025 0.0233
11/3/2020 < 0.005 0.0025 0.0227 < 0.005 0.0025 0.0227 11.0 11 0.0001 < 0.005 0.0025 0.0227
2/2/2021 < 0.005 0.0025 0.0368 < 0.005 0.0025 0.0368 24.0 24 0.0004 < 0.005 0.0025 0.0368
5/3/2021 < 0.005 0.0025 0.0230 < 0.005 0.0025 0.0230 9.0 9 0.0001 < 0.005 ) 0.0025 0.0230
8/3/2021 < 0.005 0.0025 0.0209 < 0.005 0.0025 0.0209 53.2 53.2 0.0004 < 0.005 0.0025 0.0209
11/2/2021 < 0.005 0.0025 0.0252 < 0.005 0.0025 0.0252 12.6 12.6 0.0001 < 0.005 0.0025 0.0252
2/1/2022 < 0.005 0.0025 0.0266 < 0.005 0.0025 0.0266 16.7 16.7 0.0002 < 0.005 0.0025 0.0266
5/3/2022 < 0.005 0.0025 0.0239 < 0.005 0.0025 0.0239 23.1 23.1 0.0002 < 0.005 0.0025 0.0239
Column Averages=> I 0.0025 0.02603 I 0.0025 0.02603 ng/L 13.2986 0.00014 0.0025 0.02603

INFLUENT LTMP DATA
sailazilMill Location:
INFLUENT Used in Calculated Used in Calculated Used in Calculated Used in Calculated
Sample Date < mg/L Calculation lbs/day < mg/L Calculation lbs/day < mg/L Calculation lbs/day < mg/L Calculation lbs/day
2/5/2019 < 0.01 0.005 0.0656 < 0.01 0.005 0.0656 < 0.005 0.0025 0.0328 0.119 0.119 1.56
5/7/2019 < 0.01 0.005 0.0513 < 0.01 0.005 0.0513 < 0.001 0.0005 0.0051 0.142 0.142 1.46
8/6/2019 < 0.01 0.005 0.0562 < 0.01 0.005 0.0562 < 0.001 0.0005 0.0056 0.107 0.107 1.20
11/5/2019 < 0.01 0.005 0.0442 < 0.01 0.005 0.0442 < 0.001 0.0005 0.0044 0.141 0.141 1.25
2/4/2020 < 0.01 0.005 0.0571 < 0.01 0.005 0.0571 < 0.001 0.0005 0.0057 0.106 0.106 1.21
5/5/2020 < 0.01 0.005 0.0495 < 0.01 0.005 0.0495 < 0.001 0.0005 0.0050 0.125 0.125 1.24
8/11/2020 < 0.01 0.005 0.0466 < 0.01 0.005 0.0466 < 0.001 0.0005 0.0047 0.115 0.115 1.07
11/3/2020 < 0.01 0.005 0.0455 < 0.01 0.005 0.0455 0.007 0.007 0.0636 0.138 0.138 1.25
2/2/2021 < 0.01 0.005 0.0736 < 0.01 0.005 0.0736 < 0.001 0.0005 0.0074 0.083 0.083 1.22
5/3/2021 < 0.01 0.005 0.0459 < 0.01 0.005 0.0459 0.001 0.001 0.0092 0.174 0.174 1.60
8/3/2021 < 0.01 0.005 0.0418 < 0.01 0.005 0.0418 < 0.001 0.0005 0.0042 0.133 0.133 1.11
11/2/2021 < 0.01 0.005 0.0505 < 0.01 0.005 0.0505 0.003 0.003 0.0303 0.126 0.126 1.27
2/1/2022 < 0.01 0.005 0.0532 < 0.01 0.005 0.0532 < 0.001 0.0005 0.0053 0.105 0.105 1.12
5/3/2022 0.009 0.009 0.0862 < 0.01 0.005 0.0479 < 0.001 0.0005 0.0048 0.174 0.174 1.67
Column Averages=> I 0.005 0.05479 I 0.0050 0.0521 I 0.001 0.01343 0.128 1.302

INFLUENT LTMP DATA
Sample Location: 0IL&GREASE Total P Total N COD
INFLUENT Used in Calculated Used in Calculated Used in ° Calculated Used in Calculated
Sample Date 1 i< mg/L Calculation lbs/day < mg/L Calculation lbs/day < mg/L Calculation lbs/day < mg/L Calculation lbs/day
2/5/2019 27 27 354 7.65 7.65 100 31.6 31,6 414 889 889 11655
4
5/7/2019 26 26 267 6.58 6.58 67 45.6 45.6 468 563 563 5775
8/6/2019 13 13 146 4.70 4.7 53 39.6 39.6 445 360 360 4047
11/5/2019 32 32 283 7.05 _ 7.05 62 47.9 47.9 423 554 554 4893
2/4/2020 19 19 217 4.65 4.65 53 43.3 43.3 495 551 551 6296
5/5/2020 37.1 37.1 368 5.13 5.13 51 33.6 33.6 333 _ 471 471 4667
8/11/2020 31.5 31.5 293 5.97 5.97 56 46.4 46.4 432 505 505 4704
11/3/2020 30.4 30.4 276 6.76 6.76 61 47.7 47.7 434 605 605 5500
2/2/2021 12.4 12.4 183 3.94 i 3.94 58 31.1 31.1 458 363 363 5343
5/3/2021 33.5 33.5 308 6.70 6.7 62 50.8 50.8 466 840 840 7713_
S 3/2021 22.6 22.6 189 7.00 7 58 86.5 86.5 723 577 577 4822
11/2/2021 13.5 13.5 136 4.83 ' 4.83 49 54.0 • 54 545 594 594 5999
2/1/2022 11.3 11.3 120 3.78 3.78 40 22.4 22.4 238 581 581 6183
5/3/2022 29.2 29.2 280 7.50 1 7.5 72 50.6 50.6 484 593 593 5678
Coltmm Averages=> _(_ 244.2 5.87 60.2 �15.I 454.2 1 575 5948

EFFLUENT LTMP DATA
Sample Location: I FLOW BOD AIMMONIA
EFFLUENT Used in Calculated Used in Calculated Used in Calculated
Sample Date I mg/L < mg/1., Calculation lbs/day < mg/L Calculation lbs/day < mg/L Calculation lbs/day
2/5/2022 1.572 < 2 1 13.11 < 2.50 1.25 16.39 < 0.10 0.05 0.66
5/7/2019 1.230 ' < 2 1 10.26 < 2.50 1.25 12.82 < 0.10 0.05 0.51
8/6/2019 1.348 < 2 1 11.24 < 2.50 1.25 14.05 0.31 0.306 3.44
11/5/2019 1.059 < 2 1 8.83 < 2.50 1.25 11.04 < 0.10 0.05 0.44
2/4/2020 1.370 < 2 1 11.43 < 2.50 125 14.28 < 0.10 0.05 0.57
5/5/2020 1.188 < 2 1 9.91 < 2.50 1.25 12.38 < 0.10 0.05 0.50
8/11/2020 1.117 < 2 1 9.32 < 2.50 1.25 11.64 < 0.10 0.05 0.47
11/3/2020 1.090 < 2 1 9.09 < 2.50 1.25 11.36 0.153 0.153 1.39
2/2/2021 1.765 < 2 1 14.72 < 2.50 1.25 18.40 0.138 0.138 2.03
5/3/2021 1.101 2.98 2.98 27.36 3.00 3 27.55 < 0.10 0.05 0.46
8/3/2021 1.002 < 2 1 8.36 < 2.50 1.25 10.45 0.23 0.226 1.89
11/2/2021 1.211 < 2 1 10.10 < 2.50 1.25 12.62 < 0.10 0.05 0.50
2/1/2022 1.276 < 2 1 10.64 < 2.50 1.25 13.30 0.128 0.128 1.36
5/3/2022 1.148 < 2 1 9.57 < 2.50 1.25 11.97 < 0.100 ' 0.05 0.48
Column Averages=> I 1.248 1 1.14 11.7 I 1.38 14.2 0.10 1.0

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EFFLUENT LTMP DATA
ZINC
Used in Calculated Used in Calculated Used in Calculated Used in Calculated
< mg/L Calculation lbs/day < mg/L Calculation lbs/day < mg/L Calculation lbs/day < mg/L Calculation lbs/day
< 0.01 0.005 0.066 < 0.01 0.005 0.0656 < 0.005 0.0025 0.0328 0.047 0.047 0.6162
< 0.01 0.005 0.051 < 0.01 0.005 0.0513 < 0.001 0.0005 0.0051 0.055 0.055 0.5642
< 0.01 0.005 0.056 < 0.01 0.005 0.0562 < 0.001 0.0005 0.0056 0.048 0.048 0.5396
< 0.01 0.005 0.044 < 0.01 0.005 0.0442 < 0.001 0.0005 0.0044 0.062 0.062 0.5476
< 0.01 0.005 0.057 < 0.01 0.005 0.0571 < 0.001 0.0005 0.0057 0.041 0.041 0.4685
< 0.01 0.005 0.050 < 0.01 0.005 0.0495 < 0.001 0.0005 ` 0.0050 0.038 0.038 0.3765
< 0.01 0.005 0.047 < 0.01 0.005 0.0466 < 0.001 0.0005 0.0047 0.047 0.047 0.4378
< 0.01 0.005 0.045 < 0.01 0.005 0.0455 < 0.001 ' 0.0005 0.0045 0.068 0.068 0.6182
< 0.01 0.005 0.074 < 0.01 0.005 0.0736 < 0.001 0.0005 0.0074 0.047 0.047 0.6918
< 0.01 0.005 0.046 < 0.01 0.005 0.0459 < 0.001 0.0005 0.0046 0.076 0.076 0.6979
< 0.01 0.005 0.042 < 0.01 0.005 0.0418 < 0.001 0.0005 0.0042 0.063 0.063 0.5265
< 0.01 0.005 0.050 < 0.01 0.005 0.0505 < 0.001 0.0005 0.0050 0.069 0.069 0.6969
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0.004 0.004 0.038 < 0.01 0.005 0.048 < 0.001 0.0005 0.0048 0.084 0.084 0.8042
0.0049 0.0514 0.0050 0.0521 0.0006 I 0.0071 0.0574 0.5894

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Town of Apex Sludge to Disposal Flow and %Solids
Net Weight Equivalent %Solids Dry Wt
Month ruck# loads Volume
lbs/month Average Tons days in
gallons/month month
Feburary 2019 2019 59 2,088,720 250,446.0432 3.10% 32.38976 28
March 2019 2019 59 2,105,360 252,441.2470 3.13% 32.93103 30
April2019 2019 28 992,655 119,023.3813 3.20% 15.85842 31
May 2019 2019 65 2309925 276,969 3.53% 40.7587 31
June 2019 2019 21 748820 89,787 4.19% 15.6857 441.8 30
July 2019 2019 31 1102240 132,163 3.66% 20.175 31
August 2019 2019 25 886840 106,336 3.47% 15.4046 30
September 209 2019 23 818540 98,146 3.84% 15.7171 31
October 2019 2019 32 1128580 135,321 3.90% 21.9906 31
November 2019 2019 42 1497380 179,542 3.60% 26.9796 28
December 2019 31 1078340 129 297 3.38% 18.2403 31
2019 ,
January2020 2020 61 2,134,130 255,891 3.21% 34.2591 30
Feburary 2020 2020 76 2,643,640 316,983 3.31% 43.7436 31
March 2020 2020 28 977,580 117,216 3.45% 16.8598 30
302.2
April 2020 2020 31 1,067,940 128,050 3.44% 18.3724 31
May 2020 2020 41 1,413,400 169,472 3.45% 24.3899 31
June 2020 2020 49 1,695,870 203,342 3.59% 30.4741 30
July 2020 2020 33 1,144,900 137,278 3.06% 17.5329 31
August 2020 2020 43 1,496,290 179,411 3.21% 24.0453 30
September 2020 2020 40 1,395,290 167,301 3.63% 25.3287 31
October 2020 2020 25 871,580 104,506 3.66% 15.9596 31
November 2020 2020 50 1,752,010 210,073 3.45% 30.2289 28
December 2020 2020 50 1,749,680 209,794 3.19% 27.9074 31
January 2021 2021 46 1,613,720 193,492 3.08% 24.89 30
Feburary 2021 2021 52 18,311,160 219,564 3.08% 28.16 31
March 2021 2021 55 1,931,800 231,631 3.19% 30.78 30
290.9
April 2021 2021 43 1,508,940 180,928 3.41% 25.71 31
May 2021 2021 32 1,112,840 133,434 3.71% 20.65 31
June 2021 2021 32 11,112,840 133,167 3.79% 21.04 30
July 2021 2021 36 1,260,920 151,189 3.85% 24.27 31
August 2021 2021 31 1,078,880 129,362 4.06% 21.89 30
September 2021 2021 30 1,043,900 125,168 3.72% 19.43 31
October 2021 2021 22 771,200 92,470 3.41% 13.13 31
November 2021 2021 46 1,617,580 193,954 3.45% 27.92 28
December 2021 2021 42 1,478,068 177,226 3.40% 25.12 31
January 2022 2022 39 1,369,120 164,163 3.21% 21.98 30
215.6
Feburary 2022 2022 31 1,093,480 131,113 3.30% 18.04 31
March 2022 2022 87 3,050,180 365,729 3.38% 51.58 31
April 2022 2022 39 1,359,140 162,966 3.64% 27.74 30
May 2022 2022 45 1,594,816 191,225 3.77% 30.04 31
1215 days
Average 5,716.52 3.48%
Average MG 0.005717 MG

1
Town of Apex Water Reclamation Facility Sludge Analysis
%Solids As Cd Cu Pb Hg Mo Ni Se Zn
mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg
2/5/2019 3.05 0 0.98 161 7.6 0.16 6 13 0 439
5/6/2019 3.32 0 0.98 225 7.5 0.31 6 18 0 538
8/11/2019 3.28 0 1.20 249 6.5 0.35 0 13 0 660
11/5/2019 3.2 0 0.93 234 6.7 0.19 6 14 0 587
2/4/2020 3.32 0 0.90 232 7.5 0.23 6 15 0 507
5/5/2020 3.25 0 0.77 185 7.9 0.38 5 14 0 498
8/11/2020 3.05 0 1.00 216 6.8 0.3 0 13 0 613
11/3/2020 3.10 0 0.85 185 7.1 0.24 6 16 0 517
2/2/2021 2.50 0 0.79 164 6.9 0.19 5 13 0 362
5/18/2021 2.49 0 1.10 199 6.5 0.28 6 16 0 482
8/3/2021 3.86 0 1.00 237 7.8 0.35 6 16 0 552
11/2/2021 3.44 0 0.87 223 5.7 0.2 10 17 0 560
2/1/2022 3.30 0 0.68 187 3.2 0.11 6 14 0 409
5/3/2022 3.64 0 0.77 195 0 0.19 9 16 0 458
Max 3.86 0 1.2 249 7.9 0.38 10 18 0 660

Calculator: Estimate NPDES Permit Limitations based on the Dissolved
Water Quality Standards and Stream & Effluent Hardness
FACILITY: PERMIT#: DATE: CALC BY:
Apex WRF ( NC0064050I 6/29/2022 LLA
Average Stream Flow Receiving Receiving Rec.Stream NPDES I otal I otal IWC-Instream IWC-Instream g Avera e
Stream Stream Suspended Hardness Wastewater Wastewater Average Effluent
(CFS) 1Q10 Flow Limit Upstream
summer summer Solids (CaCO3, Concentration Concentration Hardness
7 10 CFS 7Q10(MGD) [MGD] [MGD] (mg/L) mg/L) (Chronic) (Acute) Hardness
0.00 0.00 0.0000 0.00 3.60 10.00 57 1.00 1.00 57.30
Class C,C-NSW,C-Swamp,and B streams HQW streams
2 I 3 4 5 6 7 I 8 9 10
Dissolved Water Quality Translators- Total Metal Estimated NPDES Estimated NPDES
Criteria (function of total using EPA (allocated to permittee)Diss. Permit Limits [Total Permit Limits [Total
hardness) Default Metal+Translator Metal+IWC] Metal+IWC]
Partition
Chronic Acute Coefficients Chronic Acute Chronic Acute Chronic Acute
PARAMETER* [ug/I] [ug/I] (streams) (ug/I] [ug/I] [ug/l] (ug/l] [ug/l] [ug/I)
Arsenic 150 340 _ 1.000 150 340 150.00 _ 340.00 75.00 170.00
Arsenic(HH/WS) 10 N/A 1.000 10 N/A 10.00 N/A. 5.00 N/A
Beryllium 6.5 65 1.000 6.5 65 6.50 65.00 3.25 32.50
Cadmium(a) 0.28 1.69 0.252 1.1041 6.6806 • 1.1 6.68 0.6 3.34
Chlorides(WS) 250000 N/A 1.000 250000 N/A 250000 N/A 125000.0 N/A
Chromium Ill(a) 47[ 361 0.202 232.23 1785.269 232.2 1785.27 116.1 892.63
Chromium VI 11 16 1.000 11 16 11.0 16.00 5.5 8.00
Chromium,Total N/A N/A N/A N/A N/A N/A N/A N/A N/A I
Copper(a) 5.6 8.0 0.348 16.0090 22.8783 16.0 22.88 8.0 11.44
Cyanide 5.0 22.0 1.000 5.0000 22.0000 5.0 22.00 2.5 11.00
Flouride 1800.0 N/A 1.000 1800.0 N/A 1800.0 N/A 900.0 N/A
Lead(a) _ 1.37 35 0.184 7.4264 190.5743 7.43 190.57 3.71 95.29
Mercury 0.012000 N/A 1.000 0.0120 N/A 0.012000 N/A 0.0060000 N/A
Molybdenum(WS) 160.00 N/A 1.000 160.0 N/A 160.00 N/A 80.00 N/A
Nickel(a)** 32 292 0.432 75.1018 676.1715 75 676.17 38 338.09
Nickel(WS) 25 N/A 1.000 25.0000 N/A 25 N/A 13 N/A
Selenium 5' 56 1.000 5.0000 56.0000 5 56.00 3 28.00
Silver(a) 0.06 1.23 1.000 0.06 1.2344 0.06 1.23 0.03 0.62
Zinc(a) 74, 73 0.288 255.9 253.8418 256 253.84 128 126.92
Cadmium(trout streams) 1 0.28 0.511 0.2521 1.10 2.021 1.1 2.02 I 0.55} 1.01
Ia. Denotes metals for which Aquatic Life Criteria are expressed as a function of total hardness.
*Arsenic has a Human Health standard of 10 ug/L is more stingent than the freshwater standards. The Permit limit
for arsenic would be determined by taking the Human Health Standard and dividing it by an IWC based on the
mean annual flow of the receiving stream and the permitted plant flow.
IIWC=Permitted Flow+(Permitted Flow+mean annual average)
**Nickel has a Water Supply standard of 25 ug/L and in most cases is more stringent than the freshwater standard.
The Permit limit for nickel using the 25 ug/L WS standard would be determined by dividing 25 by an IWC based on

PARTIAL LISTING OF SOME INFO FROM COMP GUIDE: (Ch 2, 4, 5) updated February 2009
NC Water Quality Standards Typical Detection Levels Literature Literature 40 CFR 40 CFR 40 CFR
For Freshwater Classes Saltwater See your LTMP/STMP Literature Literature Anaerobic Median 503 503 503
Class C Class WS_ Class SC for your own Uncon- AS/Nit Digester AS Land App Land App Composte
Aquatic Water Trout Tidal Division approved -trollable Inhibition Inhibition Removal Cumulative Ceiling Ceiling
Life Supply Waters detection levels Values Values Values Rates Standard Standard Standard
Parameters mg/I mg/I mg/I mg/L ug/1 mg/I mg/I mg/I mg/I - % lbs/acre mg/kg mg/kg
Arsenic 0.050 0.01 0.050 10 0.010 0.003 0.10/1.50 1.6 45 % _ 36 75 41
Cadmium 0.002 0.0004 0.005 2 0.002 0.003 1.00/5.20 20 67 % 34 85 39
Chloride 230*AL 250 1,000 1 50
Chromium,total 0.050 0.020 5 0.005 0.050 1.00/0.394 130 82 %
Copper,total 0.007*AL .003*AL 2 0.002 0.061 1.00/0.48_ 40 86 % 1338 4300 1500
Cyanide 0.005 0.001 10 0.010 0.015 0.10/0.34 4 69 %
Lead 0.025 0.025 10 0.010 0.049 1.0/0.50 340 61 % 267 840 300
0.2 ug/I 200 ng/I
using EPA using
0.000012 245.1 / EPA 245.1
mg/I 0.000025 mg/I 0.001 ug/I I 1 ng/I
0.012 ug/I; 0.025 ugh; using EPA using EPA
Mercury 12 ng/I 25 ng/I 1631 1631 0.0003 0.10/ n/a 60 % 15 57 17
Molybdenum 100 0.100 33 % 75 75
Nickel 0.088 0.025 0.0083 10 0.010 0.021 1.00/0.25 10 42 % 374 420 420
Selenium 0.005 0.071 10 0.010 50 % 89 100 100
Silver 0.00006*AL 0.0001 *AL 5 0.005 0.005 0.25/ n/a 13 75 %
Sulfates 250 1,000 1 30
Zinc 0.05*AL 0.086*AL 10 0.010 0.175 1.0/1.0 400 79 % 2498 7500 2800
BOD 2,000 2 220 Site specific
TSS 2,000 2 220 Site Specific
Ammonia 100 0.1 25 480/n/a 1500 Site specific
Phosphorus,T 500 0.5 8 Site specific
Nitrogen,Total 1,000 1 40 Site specific
Oil&Grease 5,000 5 100 Site specific
AL*=Action Level - AS=Activated Sludge; Nit.=Nitrification
File name: HWA numbers_2022 standards
Date Revised:February 2009

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WITH E iR 44k RAVEN EL j p1—'i ,r �� ..,N ,,:6�'`,j'd
ENGINEERS I PLANNERS 1 SURVEYORS DATE JOB NO.
November io,
in MacKenan Drive 2005
CARY, NORTH CAROLINA,27511 .• ATTENTION David Hardin
[phone] PHONE#
FAX[phone] RE: Headworks Analysis Evaluation
TO: David Hardin, Pretreatment Coordinator •
Town of Apex Public Utilities
Pristine Waters Drive
Apex, North Carolina
WEARS SENDING YOU ®Attached ❑ Under separate cover via
the following items:
❑ Shop Drawings ❑ Prints ❑ Plans ❑Samples ❑ Specifications .
❑ Copy of Letter ❑ Change order ❑ Diskette ❑
COPIES DATE ' . NO. • • DESCRIPTION
1 11/10/05 Engineers Report for Middle Creek WWTP Headworks Analysis
THESE ARE TRANSMITTED as checked below:
❑ For approval ❑Approved as submitted ❑ Resubmit copies for approval
❑ Foryour use ❑Approved as noted ❑Submit copies for distribution
®As requested ❑ Returned for corrections ❑ Return corrected prints
❑ For review and comment • ❑
❑ FOR BIDS DUE 20 ❑ PRINTS RETURNED AFTER LOAN TO US
REMARKS: David,
Please find attached the Engineers Report forthe Middle Creek WWTP Headworks Analysis.
This report summarizes our meeting'at the WWTP on November 9, 2005 and should allow the
Town of Apex to re-allocate BOO and NH3 more favorably in the Headworks Analysis for future
allocations. It appears from the design criteria that the WWTP has adequate aeration and
detention time available to adequately treat the recommended increase in BOD and NH3 and
meet the existing NPDES limits. The existing design criteria does not address filtration removal
of BOD and therefore your calculated removal rates would be unfavorably skewed.
r
COPY TO: SIGNED:
l a
If enclosures are not as noted,kindly notify us at once.

WrTHER$ oc RAVENEL •
ENGINEERS I PLANNERS I SURVEYORS
ENGINEERS REPORT IF
FOR THE
Middle Creek WWTP
Headworks Analysis
!;•
• ,!
TOWN OF APEX
NORTH CAROLINA
November 2005
.-ckk
ks, • • • !
c14:1 I 'II ftley?
Page lOf 5

TOWN OF APEX WWTP HEADWORKS ANALYSIS EVALUATION
Introduction
The Town of Apex Public Utilities Department requested Withers &Ravenel assist the Town in
the preparation of the Pretreatment Headworks Analysis for the Town of Apex Middle Creek
Wastewater Treatment Plant (WWTP). The Town is concerned with the current design
removal rates for the existing WWTP and the effects on the current headworks analysis. The
Town requested that W&R evaluate the original design criteria to determine whether the
existing WWTP can achieve the removal rates necessary to allow additional BOD and NH4-
NH3 loads to the WWTP through the pretreatment program.
Background
The existing Town of Apex Middle Creek WWTP is located at Pristine Waters Drive east of Hwy
No. i and north of Hwy 55. The WWTP discharges to Middle Creek in the Neuse River Basin.
The WWTP is permitted to discharge 3.6 mgd of tertiary treated wastewater.
The WWTP consists of influent screening, grit collection, influent pumps, one 900,00o gallon
anoxic tank, two 900,00o gallon aeration tanks (Lakeside oxidation ditches), mixed liquor
recycle pumps, four 55 foot diameter secondary clarifiers, RAS pumps, chemical feed
systems for caustic, alum, ferric sulfate, four traveling bridge tertiary filters,Trojan UV4000
disinfection system, parshall flume effluent flow measurement and three aerobic sludge
digester/holding tanks.
The NPDES Permit Limits are: The current WWTP effluent averages are:
Flow 3.6 mgd Flow 2.312 mgd
BOD 5 PPm BOD 2.22 ppm
TSS 3o ppm TSS 2.38 ppm
Ammonia i ppm Ammonia o.i5 ppm
TP 2 ppm TP 1.5o ppm
TN 5-76 PPm TN 4.89 PPm
The existing WWTP is extremely compliant with the existing NPDES permit limits for these
parameters.
The Design Criteria Influent Parameters are: The current Influent Averages are:
Flow 3.6 mgd Flow 2.312 mgd
BOD 315 ppm BOD 168 ppm
TSS 350 ppm TSS 1.91. ppm
Ammonia 23 ppm Ammonia 22.2 ppm
TP UK ppm TP 8.o ppm
TN UK ppm TN 35.5PPm
Page 2 of 5

I
In addition the influent parameters for the WWTP are much lower in BOD load than the
design criteria and the NH3 loads in the design criteria are low compared to normal domestic
loads. This may allow some adjustment in the allocation of BOD and NH3 to balance the
Headworks Analysis. Currently the Headworks Analysis with industrial commitments and
uncontrollable loadings reflects percentages available for flow (33.5%), BOD (11.7%) and l ` I
Ammonia (17.0%); however, as previously discussed we believe that this allocation is flawed
based on the interpretations from the design criteria for BOD. The Headworks Allocation
Table reflects an allowable BOD of 4,729 lbs per day rather than the 9,458 lbs/day intended !
by the design engineer. Also by reallocation of the BOD and NH3 the percentages available i
can be more closely matched.
This may accomplished as follows:
: ,
The existing WWTP is designed to provide 16,774 lbs per day of oxygen.
A more typical BOD load of 25o ppm can be assumed for allocation rather than the 315 , 1 i.
reflected in the design criteria. This is still conservative since the existing influent averages
less than 210 ppm for WWTP influent and uncontrollable sampling. This would reflect an ')
allowable influent load of 3.6 mgd x 8.34 x 25o ppm =7,506 lbs/day.
A more typical NH3 load of 4o ppm can be assumed for allocation rather than the 23
reflected in the design criteria. This is very conservative. This would reflect an allowable
I
influent load of 3.6 x 8.34 x 4o ppm =1,200 lbs/day. _ ,i
Based on reaching an effluent of 5 ppm BOD then 7,356 lbs/day of BOD must be destroyed. ,1
1.5 x 7,356=11,034 lbs/day of oxygen is required.
Based on reaching an effluent of i ppm NH3 then 1,171 lbs/day of NH3 must be destroyed. . :i
4.6 x 1,171=5,386 lbs/day of oxygen is required.
'The total oxygen required to treat 25o ppm of BOD and 4o ppm of NH3 at 3.6 mgd is 16,420
lbs/day. The existing WWTP has 16,774 lbs/day lbs/day so the existing WWTP has adequate capacity •l '
i !
to reallocate the loads in this manner.
This reallocation in the Allocation Table would result in the percent available for BOD :� s
changing to 44% and the percent available for NH3 changing to 48% (assuming existing ►, j
0.144 mgd industrial flow is permitted for 4o ppm NH3). For the remaining 33.5% remaining
flow allocation this more evenly balances the BOD and NH3 allocations yet protects the
WWTP from excessive loads that would cause non-compliance in the NPDES effluent.
It is recommended that the Town of Apex pursue this re-allocation in the Headworks
Analysis. Based on our evaluation of the design criteria of the existing WWTP the existing
WWTP has sufficient volume and aeration capacity to allow the additional influent loading
calculated.
•
Page 5 of 5

- - - • . , , ., ,„. . ' ,
TABLE 5.2
TREATMENT PLANT: Apex, N.C.
CONDITION: Future Design: Maximum Month
Table 1 Table 2
DESIGN CRITERIA: Recycle MLSS F/M Waste Waste Sludge
Design Capacity= 3.6 MGD Rate Conc. Ratio Rate Rate Yield 1
Influent Flow= 3.6 MGD ,% ,mg/I ,GPD ,#/d
Peak Factor= 2.1
Influent BOD = 315 mg/I 30 1923 0.22 26834 1865 0.20
Influent Solids = 350 mg/I 40 2381 0.18 34251 2380 0.26
Influent NH3 = 23 mg/I 50 2778 0.15 40680 2827 0.31
Min. WW Temp = 12 C 60 3125 0.13 46305 3218 0.35
Max. WW Temp = 25 C 70 3431 0.12 51268 3563 0.39
Effluent BOD = 10 mg/I 80 3704 0.11 55680 3870 0.42
Effluent Solids = 10 mg/I 90 3947 0.11 59627 4144 0.45
Effluent NH3 = 1 mg/I 100 4167 0.10 63180 4391 0.48
AERATION BASINS:
Total Basin Volume 2.7 MG
No. Aeration Basins 3 Table 3
Basin Volume = 0.9 MG\ea. Recycle Clarifier Clarifier Clarifier Clarifier
Retention Time = 18.0 Hours Rate Det. Loading Loading Loading
Sludge Volume Inde 120 ,% Time, hr. ,#/d ,GPD/sf ,PPD/sf
Sludge Ret. Time = 20 Days
Return Sludge Conc 8333 mg/I 30 4.4 75057 492 8
40 4.1 100076 530 11
CLARIFIERS: 50 3.8 125095 568 13
60 3.6 150114 606 16
Clarifier Diameter= 55 ft. 70 3.3 175133 644 18
Clarifier Depth = 12 ft. 80 3.2 200152 682 21
Number of Clarifiers 4 90 3.0 225171 719 24
Clarifier Area = 9507 s.f. 100 2.8 250190 757 26
Overflow Rate = 379 GPD/sf
Table 4 Table 5
AERATION REQUIREMENTS: AERATION BASIN MIXING REQUIREMENTS:
BOD Oxygen Dema 1.5 #/# Rem. Aerator Mixing Reqd.= 50 Hp/MG
NH3 Oxygen Deman 4.6 #/# Rem. Air Reqd. (Course B.)= 20 cfm/1000cf
Air Demand = 1000 cfm/#Rem. Air Reqd. (Fine B.)= 12 cfm/1000cf
Act. Oxygen Reqd. 16774 #/d Aerator Hp Reqd. = 135 Hp
Alpha = 0.8
Beta = 0.95 Air Required (Course B.)= 7219 cfm
Cs = 8.96 mg/I
Csw = 8.14 mg/I Air Required (Fine B.)= 4332 cfm
Co = 0.5 mg/I
Std. Oxygen Regd. 23224 #/d
Aerator OTR = 2.6 #/HpHr (cw)
Aerator Hp Reqd. = 372 Hp
Air Required = 11649 cfm
HSMM Environmental Group Page 24

I
Long Term Monitoring Plan
Town of Apex,North Carolina
Modified June 2022
As required under State Pretreatment regulations,this document establishes a long term
monitoring program for the Town of Apex for the purposes of(i) compiling a database
characterizing the waste streams received at the Town's treatment works contributed from the
system's industrial, institutional, commercial, and domestic users; (ii) gauging the treatment
capability of the Town's treatment works; (iii)performing a headworks analysis of the Town's
treatment works using the collected data; (iv) establishing local limits for the control of
wastewater pollutants into the Town's treatment works; and(v)maintaining a reliable database
for updating the headworks analysis as required by the North Carolina Pretreatment Program.
The long term monitoring program may be incorporated as a part of the existing monitoring
program required under the Town's NPDES and Sludge Disposal Permit.
A. Sampling Points (See Apex WRF Diagram)
The sampling locations for collecting data representative of the treatment plant's waste
stream are briefly described below. The numbers refer to locations shown on page 6.
1. Influent
2. Effluent
3. Activated Sludge Basin(s)
4. Sludge to Disposal
5. Uncontrollable
6. SIU(s)
B. Pollutants of Concern (POCs)
Reasons for Inclusion:
NPDES -POTW NPDES Permit
Sludge - 40 CFR Sludge Land Application
EPA -EPA Required
'UP-SIU& CIU monitored/permitted pollutants
Apex LTMP Page 1
June 2022

B. Pollutants of Concern (POCs) continued
POC NPDES 40 CFR 503 Sludge EPA,NC SIU
List Required Required Required Limited
Pollutants Pollutants Pollutants Pollutants
Flow Flow Flow
BOD5 BOD5 BOD5
TSS TSS TSS
NH3 NH3 NH3
As As As
Cd Cd Cd Cd
Cr Cr Cr
Cu Cu Cu Cu Cu
CN CN
Pb Pb Pb Pb
Hg Hg Hg Hg
Mo Mo
Ni Ni Ni Ni
Se Se
Zn Zn Zn Zn Zn
TP TP TP
TN TN TN
Oil &Grease Oil&Grease
% Solids % Solids
Sludge to Sludge to disposal
disposal flow flow
C. SIU Monitoring
Significant Industrial User monitoring will be conducted per Industrial User Permit
(IUP). In Addition,the SIU will be monitored for all POCs at least once per LTMP
cycle.
D. Sampling Frequency
The monitoring frequencies for the long term monitoring plan are as follows:
Publicly Owned Treatment Works
The POTW sampling schedule shall be according to NPDES permit requirements, and
quarterly on a workday for all other periods. Samples taken from Activated Sludge Basin(s) in
operation should be taken from the distribution box as this is representative of flow
proportionally.
Significant Industrial Users (SIUs)
Apex LTMP Page 2
June 2022

Sampling schedules are described in each SIU permit for the pollutants identified in each
SIU's discharge application. The monitoring plan requires a scan for the pollutants of concern as
a part of the permit renewal process for each SIU or when changes are made resulting in the
presence of either additional parameters or increased strength of one or more known pollutants in
the SIU's discharge. If evidence is necessary to confirm the presence or absence of a particular
constituent in an SIU's discharge,then additional samples may also be obtained.
In addition to sampling performed at the SIU's facility, an Industrial Waste Survey (IWS)
will be filled out by the SIU every five years. The surveys are to be sent to all commercial and
industrial dischargers of concern, and are not limited to industries within the Apex jurisdiction or
to current SIUs. These surveys help the Town monitor what pollutants are being discharged to
the plant and may help determine new SIUs or remove SIUs status from current industries.
Sampling Point Frequency
1—Influent Quarterly on Workday&per NPDES requirement
2—Effluent Quarterly on Workday&per NPDES requirement
3—Activated Sludge Basin(s) Once per 6 months
4—Sludge to Disposal Per Sludge Permit&503 Regulations
5—Uncontrollable/Domestic Quarterly
6—SIU(s) Per SIU Permit and all POC's once per year
Apex LTMP Page 3
June 2022

E. Sampling Plan
Sampling should be performed for the Pollutants of Concern at the following locations
within the treatment plant as scheduled. All analyses of collected samples must be
performed by a laboratory certified by the State of North Carolina.
Pollutant of Point 1 - Point 2- Point 3— Point 4— Point 6- Point 7—
Concern Influent Effluent Activated Sludge to Domestic SIU(s)
Sludge Disposal
As X X X X X
Cd X X X X X X
Cr X X X X X X
Cu X X X X X X
Hg(Method X X X X
245.1)
Hg(Method X X
1631)
Mo X X X X
Ni X X X X X X
Pb X X X X X X
Se X X X X
Zn X X X X X X
Flow X X X
%Solids X X
BOD X X X X
TSS X X X X
Cyanide X X X X X
Total P X X X X
Total N X X X X
COD X X X X
Oil&Grease X X X X
NH3-N X X X X X
NO2+NO3-N X X X X
TKN X X X X
Apex LTMP Page 4
June 2022

F. Detection Level and Sampling Method
Pollutants of Concern
Detection Level & Sampling Method
BOD 2 mg/1 24 Hr. Composite
TSS 2.5 mg/1 24 Hr. Composite
NH3-N 0.10 mg/1 24 Hr. Composite
TKN 0.10 mg/1 24 Hr. Composite
Total Nitrogen 0.10 mg/1 24 Hr. Composite
Phosphorus, Total 0.05 mg/1 24 Hr. Composite
NOR-N 0.10 mg/1 24 Hr. Composite
Oil & Grease 5 mg/1 Grab
Arsenic 0.01 mg/1 24 Hr. Composite
Cadmium 0.0005 mg/1 24 Hr. Composite
Chromium,Total 0.005 mg/1 24 Hr. Composite
Copper 0.002 mg/1 24 Hr. Composite
Mercury(EPA 245.1) 0.0002 mg/1 24 Hr. Composite
Mercury (EPA 1631) 0.001 ug/1 Grab
Nickel 0.005 mg/1 24 Hr. Composite
Lead 0.01 mg/1 24 Hr. Composite
Zinc 0.01 mg/1 24 Hr. Composite
Selenium 0.01 mg/1 24 Hr. Composite
Cyanide, Total 0.01 mg/1 Grab
Molybdenum 0.01 mg/1 24 Hr. Composite
Sampling,preservation, and analytical method will be from 40 CFR 136.
Each Significant Industrial User will monitor pollutants of concern on a basis established
in its Industrial User Permit.
Sludge analysis shall be performed in accordance with 40 CFR 503.
All aeration basin and sludge to disposal samples will be grab samples.
Sludge dewatering operations will cease to operate during long term monitoring sampling
events as the supernatant enters the headworks prior to the effluent sampling site.
Apex LTMP Page 5
June 2022

Long Term Monitoring Plan Sampling/Flow Schematic
—! _-> Unnamed Tributary Influent
Parhall Aeration of Middle Creek < 0
UV Flume Cascade < 0
Disinfection
1to
Bar Screen
(2)
If
� O
Sludge Sludge Grit
V Sludge Tank 2 Tank 1 © © Removal
A > Disk Filters Tank 3
1�
���c g
< it ds� Sludge Influent Pumps
Dewatering
(-- ----, it------- -.....,...............A
cc,A Apex LTMP
Sampling Points
Clarifier 2 Clarifier 1 II \
Oxidation Ditch 1(Aerobic) —� \ 0
\ 1 Influent
cc 4 — O Effluent
RAS % tribution _<
Box A 0 Act.Sludge
Pumps VV V Oxidation Ditch 2 (Aerobic)
0 Sludge
Recycle E— O
Pumps 5 Uncontrollable
0
Clarifier3 Clarifier4 O SIU's
Oxidation Ditch 3 (Anoxic) -->
W W F—