AZ0025607_NIWTP_Final_Permit_Red.pdf

ARm~ of Environmental Q11nliJQ

ADEQ Inventory No.

LTF No.

100620 73614

Permit No.

Place ID No.

AUTHORIZATION TO DISCHARGE UNDER THE

ARIZONA POLLUTANT DISCHARGE ELIMINATION SYSTEM

www.azdeq.gov

AZ0025607

In compliance with the provisions of Arizona Revised Statutes (A.R.S.) Title 49, Chapter 2, Article 2.1; the Federal Water

Pollution Control Act, (33 USC§1251 et. seq., as amended), and Arizona Administrative Code (A.A.C.) Title 18, Chapter 9, Articles 9 and 10, and amendments thereto, City of Nogales 777 Grand Avenue

Nogales, Arizona 85621 and

International Boundary and Water Commission, U.S. Section (USIBWC) 4171 N. Mesa Street, C-100

El Paso, Texas 79902

(Permittees) are authorized to discharge treated domestic wastewater from the Nogales International Wastewater

Treatment Plant (Facility) located at 865 Rio Rico Industrial Park, Rio Rico, Arizona, serving 1.) the cities of Nogales and

Rio Rico in Santa Cruz County, Arizona, and 2.) the City of Nogales, in Sonora Mexico to an unnamed wash, tributary to

Santa Cruz River in the Santa Cruz Basin at:

Outfall No. Latitude Longitude Legal

001 31° 27' 20.86" N 110· 58' 05.34" W Township 23S, Range 13E, Section 12 in accordance with effluent limitations, monitoring requirements and other conditions set forth herein, and in the attached "Standard AZPDES Permit Conditions."

Annual Registration Fee [A.R.S. 49-255.01 and A.A.C. R18-14-104]

The annual registration fee for this permit is payable to ADEQ each year. The permitted flow for fee calculation is

17,000,000 gallons per day (gpd).

This permit shall become effective on --~m __ a~n) __ 7-d~--------~· 2020

This permit and the authorization to discharge shall expire at midnight, _ _,_,1A---=(A~ Vi_Ull _ _,/._ ______ _,. 2025

Signed this ,2 day of [(/aY'VYJ . 2020 revor Water 1sion Arizona Department of Environmental Quality

Table of Contents

PERMIT NO. AZ0025607

PART I - EFFLUENT AND INFLUENT LIMITATIONS AND MONITORING REQUIREMENTS

A. Effluent Limitations and Monitoring Requirements

B. Trace Substance Monitoring

C. Whole Effluent Toxicity Monitoring

D. Effluent Characterization Testing

E. Additional Influent Monitoring and Reporting Requirements for the USIBWC

PART II- MONITORING AND REPORTING

A. Sample Collection and Analysis

B. Reporting of Monitoring Results

C. Twenty-four Hour Reporting of Noncompliance

D. Monitoring Records

PART Ill - BIOSOLIDS / SEWAGE SLUDGE REQUIREMENTS

A. Specific Use or Disposal Requirements

B. General Use or Disposal Requirements

C. Biosolids Preparer's Responsibility

D. Duty to Mitigate

E. General Requirements

F. Biosolids Storage ......................................................................................................................... , G. Surface Water Protection ......................................................................................................................................... 2 7

H. Facilities with Pretreatment Programs

I. Inspection and Entry

J. General Biosolids Monitoring Requirements (dry weight testing)

K. Biosolids Monitoring Requirements for Disposal in a Municipal Landfill

L. On-site Management Plan

M. Record Keeping

N. Notification Requirements

0. Annual Report for all Permittees

P. Reporting Location

PART IV- WHOLE EFFLUENT TOXICITY TESTING REQUIREMENTS

A. General Conditions

B. Chronic Toxicity

C. Quality Assurance

D. Toxicity Identification Evaluation (TIE}/Toxicity Reduction Evaluation (TRE) Process

E. WET Reporting

PART V-SPECIAL CONDITIONS

A. Operation

B. Pretreatment Conditions for the USIBWC

C. Bi national Technical Committee and Information Sharing

D. The USIBWC Response to Influent Limit Exceedances

E. Pretreatment Conditions for the City of Nogales, Arizona (the City)

F. Septage Acceptance Requirements

G. Ambient Monitoring Requirements

H. Reopener

Appendix A- Part A: Acronyms

Appendix A- Part B: Definitions

Appendix B - AZPDES Discharge Flow Record

Appendix C - Ammonia Data Log

Appendix C - Ammonia Special Reporting Requirements

Appendix D - Standard AZPDES Permit Conditions & Notifications

PART I - EFFLUENT AND INFLUENT LIMITATIONS AND MONITORING REQUIREMENTS

A. Effiuent Limitations and Monitoring Requirements

PERMIT NO. AZ0025607

The Permittees shall limit and monitor discharges from Outfall 001 as specified in Table 1 which follows. These requirements are based on a design capacity of 17 MGD.

Table 1. Effluent Limitations and Monitoring Requirements

Maximum Allowable Discharge Limitations Monitoring Requirement

Parameter Mass Limits (1) Concentration Limits (21(3}

Monthly Weekly Daily Monthly Weekly Daily Monitoring Sample Type

Average Average Maximum Average Average Maximum Frequency

Discharge Flow REPORT (4) -- REPORT --· --· - Continuous Metered

(MGD)

Biochemical 2900 24-hour

Oxygen Demand 2000 kg/day kg/day

-- 30 mg/L 45 mg/L - lx/2 weeks Composite (5)

(BOD) (5-day)

85% 24-hour

BOD(6) -- -- -- REMOVAL -· - lx/2 weeks Composite

MINIMUM

Total Suspended 2000 2900 30 mg/L 45 mg/L lx/2 weeks

24-hour

Solids (TSS) kg/day kg/day Composite

85% 24-hour

TSS (6) - -- -- REMOVAL - - - lx/2 weeks C:nmrmsitf'

MINIMUM

126 575

E.coli -· -- - cfu/100 ml -- cfu/100 4x/month Discrete

(7) ml(7)

Chlorine, Total Residual (TRC) 580 g/day ··- 1200 g/d-ay 9.0 µg/L 18 µg/L lx/2 weeks Discrete

(8) (9)

Ammonia (10) --- -- - Report ··- Report · 2x/month Discrete

Ammonia Impact Ratio (AIR) - - -- -- 1 -- 2 2x/month Discrete

(9)(10)

Chromium Report Report lx/2 weeks

24-hour

(Total)

Composite

Chromium VI 520 g/day 1030 g/day 8.0 µg/L 16 µg/L lx/2 weeks Discrete

(12)

Copper (11) 590 g/day 990 g/day 9.2 µg/L 15 µg/L lx/2 weeks 24-hr

Composite

Cyanide 510 g/day 1030 g/day 7.9 µg/L 16 µg/L lx/2 weeks 24-hr -- -· Composite

Lead (11) 163 g/day 327 g/day 2.53 µg/L 5.08 µg/L lx/2 weeks 24-hr - --

Composite

Mercury 0.64 g/day - 1.3 g/day 0.01 µg/L -· 0.02 µg/L lx/2 weeks Discrete

Nickel (11) 3220 g/day 6440 g/day 50.0 µg/L 100 µg/L lx/2 weeks 24-hr

Composite

Selenium 100 g/day 200 g/day 2 µg/L 3 µg/L lx/2 weeks 24-hr - - -- Composite

Maximum Allowable Discharge Limitations

Parameter Mass Limits (1) Concentration Limits

Monthly Weekly Daily Monthly Weekly Daily Average Average Maximum Average Average Maximum

Hardness (11) -- Report -~-- Report

Benzo(a)pyrene 13 g/day 19 g/day 0.2 µg/L 0.3 µg/L - -

(PAH)

DDD 0.064 g/day -- 0.129 g/day 0.001 µg/L -- 0.002 µg/L

DDE 0.064 g/day --- 0.129 g/day 0.001 µg/L -- 0.002 µg/L

DDT 0.064 g/day -- 0.129 g/day 0.001 µg/L -- 0.002 µg/L

Endrin Aldehyde 1.9 g/day -- 4.5 g/day 0.03 µg/L - 0.07 µg/L

Heptachlor 0.64 g/day -- 1.3 g/day 0.01 µg/L -- 0.02 µg/L

Heptachlor

0.64 g/day 1.3 g/day 0.01 µg/L 0.02 µg/L epoxide

Polychlorinated

1.0 g/day 2.1 g/day 0.016 µg/L 0.033 µg/L

BiPhenyls (PCBs) -- --

2, 3, 7, 8-

0.058 g/day 0.084 g/day 0.0009 µg/L

0.0013 (TCDD) - -- µg/L

Toxaphene 0.013 g/day 0.019 g/day 0.0002 µg/L

0.0003 --- --µg/L

Chronic Toxicity Pseudokirchnerie See Table 3 See Table -- --- -- --- Ila subcapitata for limits 3 for limits (Green algae)

Chronic Toxicity Pimepha/es

See Table 3 See Table promelas -- -- --- for limits -- 3 for limits (Fathead minnow)

Chronic Toxicity Ceriodaphnia See Table 3 See Table - -- - --dubia (Water for limits 3 for limits flea) pH (9) Not less than 6.5 standard units (S.U.) nor greater than 9.0 S.U.

Footnotes

PERMIT NO. AZ0025607

Monitoring Requirement (2)(3}

Monitoring Sample Type

Frequency lx/2 weeks 24-hr

Composite lx/Quarter 24-hr

Composite lx/Quarter 24-hr

Composite lx/Quarter 24-hr

Composite lx/Quarter 24-hr

Composite lx/Quarter 24-hr

Composite lx/Quarter 24-hr

Composite lx/Quarter 24-hr

Composite lx/Quarter 24-hr

Composite lx/Quarter 24-hr

Composite lx/Quarter 24-hr

Composite lx/Quarter 24-hr

Composite

24-hr lx/Quarter

Composite lx/Quarter 24-hr

Composite lx/week Discrete

1 Mass values are to be calculated and reported using the following formulas: 1) Mass in kilograms per day= 3.785 x flow in MGD x concentration in mg/L, and 2) mass in grams per day= 3.785 x flow in MGD x concentration in µg/L.

2 Testing must coincide with the Whole Effluent Toxicity Test (WET) samples, if any, taken during that monitoring period as per Part I.C, Table 3 of the permit. See Part IV of the permit.

3 If discharge is infrequent, see Part I.D for minimum effluent characterization monitoring requirements.

4 Monitoring and reporting required. No limit set at this time. In addition to the average and maximum flows reported on the

Discharge Monitoring forms, daily discharge flow shall be recorded on the Discharge Flow Record provided in Appendix B. See Part 11.B for reporting requirements.

5 For the purposes of this permit, a "24-hour composite" sample has been defined as a mixture of discrete equal volume aliquots obtained over a period of 24 hours at a frequency of one aliquot per each 0.5 MGD (500,000 gallons) discharged.

6 Both the influent and the effluent shall be monitored.

7 cfu = colony forming units; "most probable number" (mpn) is considered equivalent for reporting purposes. The monthly average for E.coli is calculated as a geometric mean. A minimum of 4 samples are required in order to report a geometric mean. See the definition for "Monthly or Weekly Average Concentration Limit" in Appendix A.

8 Sample when chlorine or bromine compounds are used for disinfection. See Part I1.A.6 for specific monitoring requirements for chlorine.

9 pH and TRC must be measured at the time of sampling and do not require use of a certified laboratory. Measurements must be obtained in accordance with the applicable method and must meet all method quality assurance/quality control requirements to be considered valid data.

10 The ammonia limit is dependent on pH and temperature. The effluent must be tested for pH and temperature at the same time that the ammonia samples are taken. In addition to reporting the ammonia values on the DMRs, the ammonia data log shall also be completed including values of the effluent pH and temperature at the time the ammonia sample is taken. See Part I1.B of the permit.

11 WQBELs listed are based on the average effluent hardness of 121 mg/Las CaCO3. The effluent must be tested for hardness at the same time that these metal samples are taken. Please see the hardness definition in Appendix A, Part B.

12 All metals effluent limits are for total recoverable metals, except for chromium VI, for which the limits listed are dissolved.

B. Trace Substance Monitoring

The Permittees shall monitor discharges from Outfall 001 as specified in Table 2. Monitoring results above the

Assessment Levels (ALs) listed below do not constitute a permit violation but may trigger evaluation of

Reasonable Potential (RP) by ADEQ. The Permittees shall use an approved analytical method wit.ha Limit of

Quantitation (LOQ) lower than the AL values as described in Part 11.A.4.

Table 2 - Monitoring

Assessment Levels (1) (2) Monitoring Requirements (3) Parameter

Monthly Average Daily Maximum Monitoring Frequency Sample Type

Oil & Grease 10 mg/L 15 mg/L lx/Month Discrete

Benzidine 0.01 µg/L 0.01 µg/L lx/Quarter 24-hr Composite

Benz(a)anthracene (PAH) 0.2 µg/L 0.29 µg/L lx/Quarter 24-hr Composite

3,3'- Dichlorobenzidine 3.0 µg/L 4.4 µg/L lx/Quarter 24-hr Composite

N-nitrosodimethylamine 0.04 µg/L 0.03 µg/L lx/Quarter 24-hr Composite

Endrin 0.066 µg/L 0.032 µg/L lx/Quarter 24-hr Composite

Footnotes

1 Concentration values are calculated based on Arizona Water Quality Standards. Monitoring and reporting required.

2 Testing must coincide with the Whole Effluent Toxicity Test (WET) samples, if any, taken during that monitoring period as per Part I.C, Table 3 of the permit. See Part IV of the permit.

3 If discharge is infrequent, see Part I.D for minimum effluent characterization monitoring requirements.

C. Whole Effluent Toxicity Monitoring

The Permittees shall monitor discharges from Outfall 001 for Whole Effluent Toxicity (WET) as specified in Table

3 which follows. If toxicity is detected above a Permit Limit specified as follows, the Permittees must perform follow-up testing and, as applicable, follow the TIE/TRE processes in Part IV.D of the permit.

Table 3 - WET Testing

Maximum Allowable Discharge Limits Monitoring Requirements

Effluent Characteristic (1) Daily Maximum (2) (3) Monthly Median (3)

Monitoring Sample Type

Frequency (4)

Chronic Toxicity Pseudokirchneriel/a subcapitata (Green 1.6TUc 1.0TUc lx/Quarter 24-hr Composite algae) (5)

Chronic Toxicity

1.6 TUc 1.0TUc lx/Quarter 24-hr Composite

Pimephales promelas (Fathead minnow)

Chronic Toxicity

1.6 TUc 1.0TUc lx/Quarter 24-hr Composite

Ceriodaphnia dubia (Water flea)

Footnotes

1 See Part IV for additional requirements for testing and reporting Whole Effluent Toxicity (WET).

2 Since completion of one chronic WET test takes more than 24 hours, the daily maximum is considered to be the highest allowable test resu It.

3 If chronic toxicity is detected above the limits in this table, the Permittees must perform follow-up testing. See Part IV for details.

4 If discharge is infrequent see Part I.D for minimum effluent characterization monitoring requirements.

5 Formerly known as Selenastrum capricornutum or Raphidocelis subcapitata.

D. Effluent Characterization Testing

The Permittees shall monitor to characterize the facility's effluent for the parameters listed in Tables 4.a - f, whether discharging or not. When the facility discharges, monitoring is to be conducted at the frequency indicated in Tables 1 through 3. No limits or Als are established, but the LOQ must be low enough to allow comparison of the results to the applicable water quality standards (WQS). If a LOQ below the WQS cannot be achieved, then the Permittees shall use the method expected to achieve the lowest LOQ, as defined in Appendix

A of this permit. Samples are to be representative of any seasonal variation in the discharge:

Table 4.a - Effluent Characterization Testing - General Chemistry and Microbiology

Parameter Reporting Monitoring Requirements

Units Monitoring Frequency (1) Sample Type

Ammonia (as N) (2) mg/L Ix/Quarter Discrete

Biochemical Oxygen Demand (BOD-5) mg/L lx/Quarter 24-hour Composite

Chlorine, Total Residual (TRC) (4)(5) µg/L lx/Quarter Discrete

Dissolved Oxygen (5) mg/L lx/Quarter Discrete

E. coli cfu/100 ml (3) lx/Quarter Discrete

Nitrate/Nitrite (as N) mg/L lx/Quarter 24-hour Composite

Nitrogen, Total Kjeldahl (TKN) mg/L lx/Quarter 24-hour Composite

Oil and Grea!e mg/L lx/Uuarter lJ1screte pH ('i) s.u. lx/Quarter Discrete

Phosphorus mg/L lx/Quarter 24-hour Composite

Temperature (5) °Celsius lx/Quarter Discrete

Total Dissolved Solids (TDS) mg/L lx/Quarter 24-hour Composite

Total Suspended Solids (TSS) mg/L lx/Quarter 24-hour Composite

Footnotes

1 If more frequent monitoring of any of these parameters is required by another part of this permit, those sampling results may be used to satisfy Table 4.a. requirements.

2 When sampling for ammonia, temperature and pH must be determined concurrently and the results recorded on the Ammonia

Data Log provided in Appendix C. See Part 11.B for reporting requirements.

3 cfu = colony forming units; "most probable number" (mpn) is considered equivalent for reporting purposes 4 Sample when chlorine or bromine compounds are used for disinfection. See Part 11.A.6 for specific monitoring requirements for chlorine 5 Temperature, pH, TRC and dissolved oxygen must be measured at the time of sampling and do not require use of a certified laboratory. See Part 11.A.6 for methods of analyses for chlorine. Measurements must be obtained in accordance with the applicable method and must meet all method quality assurance/quality control requirements to be considered valid data.

Table 4.b.,... Effluent Characterization Testing - Selected Metals, Trace Substances and WET

Reporting Monitoring Requirements Parameter (1) Units Monitoring Frequency (2)

Antimony µg/L lx/Quarter

Arsenic µg/L lx/Quarter

Beryllium µg/L lx/Quarter

Cadmium µg/L lx/Quarter

Chromium (5) µg/L lx/Quarter

Chromium VI (5) µg/L lx/Quarter

Copper µg/L lx/Quarter

Iron µg/L lx/Quarter

Lead µg/L lx/Quarter

Mercury µg/L lx/Quarter

Nickel µg/L lx/Quarter

Selenium µg/L lx/Quarter

Silver µg/L lx/Quarter

Thallium µg/L lx/Quarter

Zinc µg/L lx/Quarter

Hardness mg/L lx/Quarter

Cyanide µg/L lx/Quarter

Whole Effluent Toxicity - chronic TUc 4x/permit term (4)

(all 3 species) (3)

Footnotes

1 All metals analyses shall be for total recoverable metals, except chromium VI, which is dissolved

PERMIT NO. AZ0025607

Sample Type

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

Discrete

24-hour Composite

24-hour Composite

24-hour Composite

Discrete

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

Discrete

24-hour Composite

2 If more frequent monitoring of any of these parameters is required by another part of this permit, those sampling results may be used to satisfy Table 4.b. requirements.

3 If chronic toxicity is detected above the limits specified in Table 3, the Permittees must perform follow-up testing and, as applicable, follow the TIE/TRE processes in Part IV.E of the permit, whether discharging or not. See Part IV for additional information on requirements for testing and reporting Whole Effluent Toxicity (WET).

4 Four tests shall be conducted during the permit term: once per year in years 1, 2, 3, and 4 of the permit term.

5 If total chromium exceeds 8 µg/L, the Permittees must conduct sampling for chromium VI for the remainder of the permit. Otherwise, monitoring for chromium Ill and/or chromium VI is not required.

Table 4.c - Effluent Characterization Testing - Selected Volatile Organic Compounds

"epurting •"--:a.--:-- n--··:•----a Parameter

IVIUIIILUllllfS ru:"IUIICIIICIIL:t

Units Monitoring Frequency

Acrolein µg/L lx /year in years 2020,2021,2023 of permit term

Acrylonitrile µg/L lx /year in years 2020,2021,2023 of permit term

Benzene µg/L lx /year in years 2020,2021,2023 of permit term

Bromoform µg/L lx /year in years 2020,2021,2023 of permit term

Carbon tetrachloride µg/L lx /year in years 202q,2021,2023 of permit term

Chlorobenzene µg/L lx /year in years 2020,2021,2023 of permit term

Chlorodibromomethane µg/L lx /year in years 2020,2021,2023 of permit term

Chloroethane µg/L lx /year in years 2020,2021,2023 of permit term

2-chloroethylvinyl ether µg/L lx /year in years 2020,2021,2023 of permit term

Chloroform µg/L lx /year in years 2020,2021,2023 of permit term

Dichlorobromomethane µg/L lx /year in years 2020,2021,2023 of permit term

1, 1-dichloroetha ne µg/L lx /year in years 2020,2021,2023 of permit term

1,2-dichloroethane µg/L lx /year in years 2020,2021,2023 of permit term

Trans-1,2-dichloroethylene µg/L lx /year in years 2020,2021,2023 of permit term

1, 1-dichloroethyle ne µg/L lx /year in years 2020,2021,2023 of permit term

1,2-dichloropropane µg/L lx /year in years 2020,2021,2023 of permit term

1,3-dichloropropylene µg/L lx /year in years 2020,2021,2023 of permit term

Ethyl benzene µg/L lx /year in years 2020,2021,2023 of permit term

Methyl bromide pg/L 1x /year in years 7070,7071,707~ nf pPrmit tPrm

Methyl chloride µg/L lx /year in years 2020,2021,2023 of permit term

Methylene chloride µg/L lx /year in years 2020,2021,2023 of permit term

1, 1, 2,2-tetrachlo roetha ne µg/L lx /year in years 2020,2021,2023 of permit term

Tetrachloroethylene µg/L lx /year in years 2020,2021,2023 of permit term

Toluene µg/L lx /year in years 2020,2021,2023 of permit term

1, 1, 1-trichloroetha ne µg/L lx /year in years 2020,2021,2023 of permit term

1, 1,2-trichloroetha ne µg/L lx /year in years 2020,2021,2023 of permit term

Trichloroethylene µg/L lx /year in years 2020,2021,2023 of permit term

Vinyl chloride µg/L lx /year in years 2020,2021,2023 of permit term

PERMIT NO. AZ0025607

Sample Type

Discrete

Discrete

Discrete

Discrete

Discrete

Discrete

Discrete

Discrete

Discrete

Discrete

Discrete

Discrete

Discrete

Discrete

Discrete

Discrete

Discrete

Discrete

OiSUPtP

Discrete

Discrete

Discrete

Discrete

Discrete

Discrete

Discrete

Discrete

Discrete

Table 4.d - Effluent Characterization Testing - Selected Acid Extractable Compounds

Parameter Reporting Monitoring Requirements

Units Monitoring Frequency

P-chloro-m-cresol µg/L lx /year in years 2020,2021,2023 of permit term

2-chlorophenol µg/L lx /year in years 2020,2021,2023 of permit term

2,4-dichlorophenol µg/L lx /year in years 2020,2021,2023 of permit term

2,4-dimethylphenol µg/L lx /year in years 2020,2021,2023 of permit term

4,6-dinitro-o-cresol µg/L lx /year in years 2020,2021,2023 of permit term

2,4-dinitrophenol µg/L lx /year in years 2020,2021,2023 of permit term

2-nitrophenol µg/L lx /year in years 2020,2021,2023 of permit term

4-nitrophenol µg/L lx /year in years 2020,2021,2023 of permit term

Pentachlorophenol µg/L lx /year in years 2020;2021,2023 of permit term

Phenol µg/L lx /year in years 2020,2021,2023 of permit term

2,4,6- trichlorophenol µg/L lx /year in years 2020,2021,2023 of permit term

Table 4.e - Effluent Characterization Testing - Selected Base Neutral Compounds

Parameter Reporting Monitoring Requirements

Units Monitoring Frequency

Acenaphthene µg/L lx /year in years 2020,2021,2023 of permit term

Acenaphthylene µg/L lx /year in years 2020,2021,2023 of permit term

Anthracene µg/L lx /year in years 2020,2021,2023 of permit term

Benzidine µg/L lx /year in years 2020,2021,2023 of permit term

Benzo(a)anthracene µg/L lx /year in years 2020,2021,2023 of permit term

Benzo(a)pyrene µg/L lx /year in years 2020,2021,2023. of permit term

3,4 benzofluoranthene µg/L lx /year in years 2020,2021,2023 of permit term

Benzo(ghi)perylene µg/L lx /year in years 2020,2021,2023 of permit term

Benzo(k)fluoranthene µg/L lx /year in years 2020,2021,2023 of permit term

Bis {2-chloroethoxy) methane µg/L lx /year in years 2020,2021,2023 of permit term

Bis (2-chloroethyl) ether µg/L lx /year in years 2020,2021,2023 of permit term

Bis(2-chloroisopropyl) ether µg/L lx /year in years 2020,2021,2023 of permit term

Bis (2-ethylhexyl) phthalate µg/L lx /year in years 2020,2021,2023 of permit term

4-bromophenyl phenyl ether µg/L lx /year in years 2020,2021,2023 of permit term

Butyl benzyl phthalate µg/L lx /year in years 2020,2021,2023 of permit term

2-chloronaphthalene µg/L lx /year in years 2020,2021,2023 of permit term

4-chlorophenyl phenyl ether µg/L lx /year in years 2020,2021,2023 of permit term

Chrysene µg/L lx /year in years 2020,2021,2023 of permit term

Di-n-butyl phthalate µg/L lx /year in years 2020,2021,2023 of permit term

Di-n-octyl phthalate µg/L lx /year in years 2020,2021,2023 of permit term

PERMIT NO. AZ0025607

Sample Type

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

Sample Type

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

Dibenzo(a,h)anthracene

1,2-dichlorobenzene

1,3-dichlorobenzene

1,4-dichlorobenzene

3,3-dichlorobenzidine

Diethyl phthalate

Dimethyl phthalate

2,4-dinitrotoluene

2,6-dinitrotoluene

1,2-diphenylhydrazine

Fluoranthene

Fluorene

Hexachlorobenzene

Hexachlorobutadiene

Hexachlorocyclopentadiene

Hexach loroctha ne lndeno(l,2,3-cd)pyrene lsophorone

Naphthalene

Nitrobenzene

N-nitrosodi-n-propylamine

N-nitrosodimethylamine

N-nitrosodiphenylamine

Phenanthrene

Pyrene

1,2,4-trichlorobenzene

Reporting Monitoring Requirements

Units Monitoring Frequency µg/L lx /year in years 2020,2021,2023 of permit term µg/L lx /year in years 2020,2021,2023 of permit term µg/L lx /year in years 2020,2021,2023 of permit term µg/L lx /year in years 2020,2021,2023 of permit term µg/L lx /year in years 2020,2021,2023 of permit term µg/L lx /year in years 2020,2021,2023 of permit term µg/L lx /year in years 2020,2021,2023 of permit term µg/L lx /year in years 2020,2021,2023 of permit term µg/L lx /year in years 2020,2021,2023 of permit term µg/L lx /year in years 2020,2021,2023 of permit term µg/L lx /year in years 2020,2021,2023 of permit term µg/L lx /year in years 2020,2021,2023 of permit term µg/L lx /year in years 2020,2021,2023 of permit term µg/L lx /year in years 2020,2021,2023 of permit term µg/L lx /year in years LULU,LULl,LUL~ of permit term µg/L lx /year in years 2020,2021,2023 of permit term µg/L lx /year in years 2020,2021,2023 of permit term µg/L lx /year in years 2020,2021,2023 of permit term µg/L lx /year in years 2020,2021,2023 of permit term µg/L lx /year in years 2020,2021,2023 of permit term µg/L lx /year in years 2020,2021,2023 of permit term µg/L lx /year in years 2020,2021,2023 of permit term µg/L lx /year in years 2020,2021,2023 of permit term µg/L lx /year in years 2020,2021,2023 of permit term µg/L lx /year in years 2020,2021,2023 of permit term µg/L lx /year in years 2020,2021,2023 of permit term

PERMIT NO. AZ0025607

Sample Type

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

L4-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24 hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

Table 4.f- Effluent Characterization Testing - Based on Designated Users

Additional Parameters from the Arizona Surface Water Quality Standards, Appendix A; Table 1

Parameter Reporting Monitoring Requirements

Units Monitoring Frequency Sample Type

Alachlor (1) µg/L lx /year in years 2022 and 2023 of permit term 24-hour Composite

Aldrin µg/L lx /year in years 2020,2021,2023 of permit term 24-hour Composite

Asbestos- µg/L lx /year in years 2020,2021,2023 of permit term 24-hour Composite

Atrazine (1) µg/L lx//year in years 2021 and 2022 of permit term 24-hour Composite

Barium µg/L lx /year in years 2020,2021,2023 of permit term 24-hour Composite

Boron µg/L lx /year in years 2020,2021,2023 of permit term 24-hour Composite

Carbofuran (Furadan) (1) µg/L lx /year in years 2021 and 2022 of permit term 24-hour Composite

Chlordane µg/L lx /year in years 2020,2021,2023 of permit term 24-hour Composite

1,2-cis-Dichloroethylene µg/L lx /year in years 2020,2021,2023 of permit term 24-hour Composite

Chlorpyrifos µg/L lx /year in years 2020,2021,2023 of permit term 24-hour Composite

Dalapon (1) µg/L lx /year in years 2021 and 2022 of permit term 24-hour Composite l,2-Dibromo-3-chloropropane (DBCP) µg/L lx /year in years 2020,2021,2023 of permit term 24-hour Composite

1,2-Dibromoethane (EDB) µg/L lx /year in years 2020,2021,2023 of permit term 24-hour Composite

Ethylene dibromide

4,4-DD (p,p,-µg/L lx /year in years 2020,2021,2023 of permit term 24-hour Composite

Dichlorodiphenyldicholoroethane)

4,4-DDE (p,p- µg/L lx /year in years 2020,2021,2023 of permit term 24-hour Composite Dichlorodiphenyldichloroethylene)

4,4-DDT ((p,p-µg/L lx /year in years 2020,2021,2023 of permit term 24-hour Composite

Dichlorodiphenyltrichloroethane)

2,4-Dichlorophenoxyacetic acid (2,4-µg/L lx /year in years 2021and 2022 of permit term 24-hour Composite

D) (1)

Dieldrin µg/L lx /year in years 2020,2021,2023 of permit term 24-hour Composite

Di (2-ethylhexyl) adipate µg/L lx /year in years 2020,2021,2023 of permit term 24-hour Composite

Dinoseb (1) µg/L lx /year in years 2021and 2022 of permit term 24-hour Composite

Diquat (1) µg/L lx /year in years 2021and 2022 of permit term 24-hour Composite

Endosulfan sulfate µg/L lx /year in years 2020,2021,2023 of permit term 24-hour Composite

Endosulfan (Total) µg/L lx /year in years 2020,2021,2023 of permit term 24-hour Composite

Endothall (1) µg/L lx /year in years 2021and 2022 of permit term 24-hour Composite

Endrin µg/L lx /year in years 2020,2021,2023 of permit term 24-hour Composite

Endrin aldehyde µg/L lx /year in years 2020,2021,2023 of permit term 24-hour Composite

Fluoride µg/L lx /year in years 2020,2021,2023 of permit term 24-hour Composite

Glyphosate (1) µg/L lx /year in years 2021and 2022 of permit term 24-hour Composite

Guthion µg/L lx /year in years 2020,2021,2023 of permit term 24-hour Composite

Heptachlor µg/L lx /year in years 2020,2021,2023 of permit term 24-hour Composite

Heptachlor epoxide µg/L lx /year in years 2020,2021,2023 of permit term 24-hour Composite

Hexachlorocyclohexane µg/L lx /year in years 2020,2021,2023 of permit term 24-hour Composite alpha (Alpha-BHC)

Additional Parameters from the Arizona Surface Water Quality Standards, Appendix A; Table 1

Parameter Reporting Monito;ing Requl;ements

Units Monitoring Frequency Sample Type

Hexachlorocyclohexane beta µg/L lx /year in years 2020,2021,2023 of permit term 24-hour Composite

Hexachlorocyclohexane delta µg/L lx /year in years 2020,2021,2023 of permit term 24-hour Composite

Hexachlorocyclohexane gamma µg/L lx /year in years 2020,2021,2023 of permit term 24-hour Composite

(lindane)

Hydrogen Sulfide µg/L lx /year in years 2020,2021,2023 of permit term Discrete

Iron µg/L lx /year in years 2020,2021,2023 of permit term 24-hour Composite

Malathion µg/L lx /year in years 2020,2021,2023 of permit term 24-hour Composite

Manganese µg/L lx /year in years 2020,2021,2023 of permit term 24-hour Composite

Methoxychlor (1) µg/L lx /year in years 2021and 2022 of permit term 24-hour Composite

Mirex (2) µg/L lx /year in years 2021and 2022 of permit term 24-hour Composite

Oxamyl (1) µg/L lx /year in years 2021and 2022 of permit term 24-hour Composite

Parathion µg/L lx /year in years 2020,2021,2023 of permit term 24-hour Composite

Paraquat µg/L lx /year in years 2020,2021,2023 of permit term 24-hour Composite

Permethrin (2) µg/L lx /year in years 2021and 2022 of permit term 24-hour Composite

Pichloram (1) µg/L lx /year in years 2021and 2022 of permit term 24-hour Composite

Polychlorlnated biphenyls (PCBs) µg/L l>< /year In years 2020,2021,2023 of permit term 24-hour Composite

Simazine (1) µg/L lx /year in years 2021and 2022 of permit term 24-hour Composite

Styrene µg/L lx /year in years 2020,2021,2023 of permit term Discrete

Sulfides (2) µg/L lx /year in years 2020,2021,2023 of permit term Discrete

2,3, 7,8-Tetrach lorodi benzo-p-dioxi n µg/L lx /year in years 2020,2021,2023 of permit term 24-hour Composite

Toxaphene µg/L lx /year in years 2020,2021,2023 of permit term 24-hour Composite

2-(2,4,5,-Trichlorophenoxy) µg/L lx /year in years 2021and 2022 of permit term 24-hour Composite

Proprionic Acid (1)

Total Trihalomethanes µg/L lx /year in years 2020,2021,2023 of permit term Discrete

Tributyltin (2) µg/L lx /year in years 2021and 2022 of permit term 24-hour Composite

Uranium µg/L lx /year in years 2020,2021,2023 of permit term 24-hour Composite

Xylenes µg/L lx /year in years 2020,2021,2023 of permit term Discrete

Footnotes

1 There may be no approved wastewater methods for analyses of these parameters in 40 CFR 136. As such, 500 series drinking water

Methods may be used; in this case, a lOX sample dilution is acceptable for these parameters. Appropriate data qualifiers are to be used.

2 If no ADHS-certified analytical methods exist for these parameters, monitoring is not required.

E. Additional Influent Monitoring and Reporting Requirements for the USIBWC

1. The USIBWC shall monitor pollutants in the influent from Mexico at the International Outfall Interceptor

(IOI), Manhole No. 1, as specified in Table 5 which follows. Monitoring results above the Influent Mass

Limits triggers the USIBWC to complete the actions listed in Part V.D. The USIBWC shall demonstrate compliance with the Influent Mass Limits by showing that the influent is at or below the limits in Table 5, or by complying with provisions in Part V.B-D of this permit.

Table 5 - Influent Limitations at IOI, Manhole No. 1

Influent Mass

Pollutants of Concern Limits(lb/Mgal) (2) Monitoring Frequency (4) Sample Type (3)

Daily Maximum

Arsenic (1) 0.156 30 consecutive daily samples/ Quarter 24-hr Composite

Cadmium (1) 0.028 30 consecutive daily samples/ Quarter 24-hr Composite

Chromium (1) 0.114 30 consecutive daily samples/ Quarter 24-hr Composite

Copper (1) 0.858 30 consecutive daily samples/ Quarter 24-hr Composite

Cyanide (1) 0.341 30 consecutive daily samples/ Quarter Discrete

Lead (1) 0.10 30 consecutive daily samples/ Quarter 24-hr Composite

Mercury (1) 0.006 30 consecutive daily samples/ Quarter 24-hr Composite

Nickel (1) 0.938 30 consecutive daily samples/ Quarter 24-hr Composite

Selenium (1) 0.038 30 consecutive daily samples/ Quarter 24-hr Composite

Silver (1) 0.125 30 consecutive daily samples/ Quarter 24-hr Composite

Zinc (1) 1.814 30 consecutive daily samples/ Quarter 24-hr Composite

1,4 - Dichlorobenzene 0.601 30 consecutive daily samples/ Quarter Discrete

Footnotes

1 All metal influent limits are for total recoverable metals.

2 Lb/Mgal means pounds per million gallons.

3 For the purposes of this permit, a "24-hour composite" sample has been defined as a flow-proportioned mixture of not less than three discrete samples (aliquots) obtained at equal time intervals during a 24-hour period. The volume of each aliquot shall be directly proportional to the discharge flow rate at the time of sampling.

4 Monitoring shall coincide with effluent monitoring in Table 1 Effluent Limitations and Monitoring Requirements.

2. Concurrent with the sampling specified in Section E.1 above, the USIBWC shall collect and analyze 30 consecutive daily samples per quarter of the Facility influent and effluent for the parameters listed in Table 5 at the following locations:

a. Influent samples shall be taken after the last addition to the collection system, at a location upstream of any in-plant return flow, recycle flows, or the addition of treatment chemicals, and prior to the first treatment process.

b. Effluent samples shall be taken downstream from the last treatment process.

3. Concurrent with the sampling specified in Section E.1 and E.2 above, the USIBWC shall measure redox potential at the IOI, Manhole No. 1 and the Facility influent and effluent following the sample types listed in Table 5. The USIBWC shall measure influent flow at the IOI, Manhole No. 5, and the Facility.

4. The USIBWC shall monitor and conduct annual sampling and analysis of the Facility influent for the remaining toxic pollutants, as specified in Table 6 which follows.

Table 6 - The Facility Influent Monitoring

Parameter (1) Reporting

Units

Aluminum µg/L

Antimony µg/L

Barium µg/L

Bervllium µg/L

Boron µg/L

Thallium µg/L

Acrolein µg/L

Acrylonitrile µg/L

Benzene µg/L

Bromofonn µg/L

Bromodichloromethane µg/L

Carbon tetrachloride µg/L

Chlorobenzene µg/L

Chlorodibromomethane ~1e/1

Chloroethane µg/L

2-chloroethylvinyl ether µg/L

Chloroform µg/L

1,1-dichloroethane µg/L

1,2-dichloroethane µg/L

1,2-Trans-dichloroethylene µg/L

1,1-Dichloroethylene µg/L

1,2-Dichloropropane µg/L

Dichloroditluoromethane µg/L

Dichloromethane (MethYlene Chloride) µg/L

EthYlbenzene µg/L

Methvlbromide µg/L

Methyl chloride µg/L

1, 1,2, 2-Tetrachloroethane µg/L

Tetrachloroethylene µg/L

Toluene µg/L

1,1,1-Trichloroethane µg/L

1, 1,2-Trichloroethane µg/L

Trichloroethvlene µg/L

Monitoring Requirements

Monitoring Frequency (2) lx/Year lx/Year lx/Year lx/Year lx/Year lx/Year lx/Year lx/Year lx/Year lx/Year lx/Year lx/Year lx/Year lx/Year lx/Year lx/Year lx/Year lx/Year lx/Year lx/Year lx/Year lx/Year lx/Year lx/Year lx/Year lx/Year lx/Year lx/Year lx/Year lx/Year lx/Year lx/Year lx/Year

PERMIT NO. AZ0025607

Sample Type

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24 hour Compoaitc

74-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composile

Trichlorofluoromethane

Tetrachloroethene (PERC)

Vinyl chloride o-Ch loro-m-cresol

2-Chloroohenol

2,4-Dichloroohenol

Nitrate

2,4-Dimethylphenol

4,6-Dinitro-o-cresol

2,4-Dinitrophenol p-Nitrophenol

4-Nitrophenol

Phenol

2,4,6-Trichloroohenol

Acenaphthene

Anthracene

Benzidine

Benzo(a)pyrene

3,4-Benzofluoranthene

Bis(2-chloroethyl)ether

Bis(2-chloroisoorooyl)ether

4-BromoohenYI ohenyl ether o-Bromodiohenvl ether

2-Chloronaohthalene

Butyl benzyl phthalate

Di-n-butYlohthalate

1,2-Dichlorobenzene

1,3-Dichlorobenzene

3,3-Dichlorobenzidine

Pentachlorophenol

Chlorobenzene

DiethYI ohthalate

Dimethvl ohthalate

Reporting Units µg/L µg/L µg/L µg/L µg/L µg/L µg/L µg/L µg/L µg/L µg/L µg/L µg/L µg/L µg/L µg/L µg/L µg/L µg/L µg/L µg/L µg/L µg/L µg/L µg/L µg/L µg/L µg/L µg/L µg/L µg/L µg/L µg/L

Monitoring Requirements

Monitoring Frequency (2) lx/Year lx/Year lx/Year lx/Year lx/Year lx/Year lx/Year lx/Year lx/Year lx/Year lx/Year lx/Year lx/Year lx/Year lx/Year lx/Year lx/Year lx/Year lx/Year lx/Year lx/Year lx/Year lx/Year lx/Year lx/Year lx/Year lx/Year lx/Year lx/Year lx/Year lx/Year lx/Year lx/Year

PERMIT NO. AZ0025607

Sample Type

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

2,4-Dinitrotoluene

2,6-Dinitrotoluene

1,2-Diphenylhydrazine

Fluoranthene

Fluorene

Fluoride

Fluorine

Hexachlorobenzene

Hexachlorobutadiene

Hexachlorocyclo-oentadiene

Hexachloroethane lsoohorone

Bis(2-ethylhexvl)ohthalate

Nitrite

Naphthalene

Chloronaphthalene beta

Nitrobenzene

N-nitrosodiphenylamine

Pvrene

1,2,4-Trich lorobenzene

Atrazine

Aldrin

Alachlor

Carbofuran

Chlordane

4,4'-DDD

4,4'-DDE

4,4'-DDT

2,4-Dichloroohenoxyacetic acid (2,4-DI

Cis-1,3-Dichlorooropene

Dieldrin

Endosulfan sulfate

Endosulfan I

Reporting Monitoring Requirements

Units Monitoring Frequency (2) µg/L lx/Year µg/L lx/Year µg/L lx/Year µg/L lx/Year µg/L lx/Year µg/L lx/Year µg/L lx/Year µg/L lx/Year µg/L lx/Year µg/L lx/Year µg/L lx/Year µg/L lx/Year µg/L lx/Year µg/L lx/Year µg/L lx/Year µg/L lx/Year µg/L lx/Year µg/L lx/Year µg/L lx/Year µg/L lx/Year µg/L lx/Year µg/L lx/Year µg/L lx/Year µg/L lx/Year µg/L lx/Year µg/L lx/Year µg/L lx/Year µg/L lx/Year µg/L lx/Year µg/L lx/Year µg/L lx/Year µg/L lx/Year µg/L lx/Year

PERMIT NO. AZ0025607

Sample Type

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

24-hour Composite

Monitoring Requirements

Reporting Parameter (1) Units Monitoring Frequency (2) Sample Type

Endosulfan II µg/L lx/Year 24-hour Composite

Endrin µg/L lx/Year 24-hour Composite

Endrin aldehyde µg/L lx/Year 24-hour Composite

Heptachlor µg/L lx/Year 24-hour Composite

Phenanthrene (PAH) µg/L lx/Year 24-hour Composite

Heotachlor epoxide µg/L lx/Year 24-hour Composite

Alpha-BHC µg/L lx/Year 24-hour Composite

Beta-BHC µg/L lx/Year 24-hour Composite

Delta-BHC µg/L lx/Year 24-hour Composite

Gamma-BHC(Lindane) µg/L lx/Year 24-hour Composite

Methoxychlor µg/L lx/Year 24-hour Composite

PCBs µg/L lx/Year 24-hour Composite

Styrene µg/L lx/Year 24-hour Composite

Sulfides µg/L lx/Year 24-hour Composite

2,3,7,8-TCDD (Dioxin) µg/L lx/Year 24-hour Composite

Toxaphene µg/L lx/Year 24-hour Composite

2,4,5-TP (Silvex) µg/L lx/Year 24-hour Composite

Total Xylenes µg/L lx/Year 24-hour Composite

Chlorine, total µg/L lx/Year 24-hour Composite

Toluene µg/L lx/Year 24-hour Composite

Footnotes

1 All metal analyses are for total recoverable metals.

5. In addition to the reporting requirements in Part 11.B. of the permit, the USIBWC shall submit a quarterly report to ADEQ no later than 28 days following the end of each quarter as an attachment with the discharge monitoring report (DMR)s which includes all the test results required by this part for the monitoring conducted during that quarter. This report shall include a summary of the monitoring results, a comparison of the influent monitoring results with the influent limits in Table 5 above, and a comparison of the effluent monitoring results with the applicable effluent limits in

Part I.A, Table 1 ofthis permit, if any.

6. The USIBWC may, but is not required to, conduct a pilot test using real-time influent monitoring technology. Upon successful completion of the pilot test, the USIBWC may propose alternative influent monitoring using the real-time monitoring method and request a reduction or substitution of the monitoring requirements specified in subsections E.1- E.5 above. No reduction in monitoring is authorized until approval by ADEQ is received in writing.

7. The USIBWC may, in its sole discretion, choose to provide additional treatment at the treatment plant as necessary to ensure that the effluent limits in Part I.A and C and the biosolids ceiling concentrations in Part 111.J.1 of this permit are met. If this option is selected, a modification of the permit may be requested to remove the monitoring requirements and influent limits in Part I.E above and reduce the remaining monitoring and reporting requirements in Part I.E as appropriate.

F. The discharge shall be free from pollutants in amounts or combinations that:

1. Settle to form bottom deposits that inhibit or prohibit the habitation, growth or propagation of aquatic life;

2. Cause objectionable odor in the area in which the surface water is located;

3. Cause off-flavor in aquatic organisms;

4. Are toxic to humans, animals, plants or other organisms;

5. Cause the growth of algae or aquatic plants that inhibit or prohibit the habitation, growth or propagation of other aquatic life or that impair recreational uses.

G. The discharge shall be free from oil, grease and other pollutants that float as debris, foam, or scum; or that cause a film or iridescent appearance on the surface of the water; or that cause a deposit on a shoreline, bank or aquatic vegetation.

H. The discharge shall not cause an increase in the ambient water temperature of more than 3.0 degrees Celsius.

I. The discharge shall not cause the dissolved oxygen concentration in the receiving water to fall below 3 mg/L from 3 hours after sunrise to sunset and 1 mg/I from sunset to 3 hours after sunrise, unless the percent saturation of oxygen remains equal to or greater than 90%.

J. Samples taken for the monitoring requirements specified in Part I shall be collected at the following locations:

1. Influent samples shall be taken after the last addition to the collection system and prior to the first treatment process.

2. Effluent samples shall be taken downstream from the last treatment process and prior to mixing with the receiving waters.

PART II - MONITORING AND REPORTING

A. Sample Collection and Analysis

1. The Permittees are responsible for the quality and accuracy of all data required under this permit.

2. Quality Assurance (QA) Manual - The Permittees shall keep a QA Manual on site that describes the sample collection and analyses processes. If the Permittees collect samples or conducts sample analyses in house, the Permittees shall develop a QA Manual that addresses these activities. If a third party collects and/or analyzes samples on behalf of the Permittees, the Permittees shall obtain a copy of the applicable QA procedures. The QA Manual shall be available for review by ADEQ upon request.

The QA Manual shall be updated as necessary to reflect current conditions, and shall describe the following:

a. Project Management, including:

i. Purpose of sample collection and sample frequency;

ii. When and where samples will be collected;

iii. How samples will be collected;

iv. Laboratory(s) that will perform analyses;

v. Any field tests to be conducted (detail methods and specify equipment, including a description of any needed calibrations); and

vi. Pollutants or analytes being measured and for each, the permit-specific limits, Assessment Levels, or thresholds, (e.g. the associated detection limits needed.)

b. Sample collection procedures including;

i. Equipment to be used;

ii. Type and number of samples to be collected including QA/QC samples (i.e., background samples, duplicates, and equipment or field blanks);

iii. Types, sizes and number of sample bottles needed;

iv. Preservatives and holding times for the samples (see methods under 40 CFR 136 or 9

A.A.C. 14, Article 6 or any condition within this permit that specifies a Chain of

Custody procedures.

c. Specify approved analytical method(s) to be used and include;

i. Limits of Detection (LOD) and Limits of Quantitation (LOQs);

ii. Required quality control (QC) results to be reported (e.g., matrix spike recoveries, duplicate relative percent differences, blank contamination, laboratory control sample recoveries, surrogate spike recoveries, etc.) and acceptance criteria; and

iii. Corrective actions to be taken by the Permittees or the laboratory as a result of problems identified during QC checks.

d. How the Permittees will perform data review; complete DMRs and records used to report results to ADEQ; resolve data quality issues; and identify limitatio'ns on the use of the data.

3. Sample collection, preservation and handling shall be performed as described in 40 CFR 136 including the referenced Edition of Standard Methods for the ExamJnation of Water and Wastewater, or by procedures referenced in A.R.S. Title 9, Chapter 14 of the Arizona Department of Health Services

(ADHS) Laboratory Licensure rules. The Permittees shall outline the proper procedures in the QA

Manual, and samples taken for this permit must conform to these procedures whether collection and handling is performed directly by the Permittees or contracted to a third-party.

4. Analytical requirements

a. The Permittees shall use a laboratory licensed by the ADHS Office of Laboratory Licensure and

Certification that has demonstrated proficiency within the last 12 months under R9-14-609, for each parameter to be sampled under this permit. Howeyer, this requirement does not apply to parameters which require analysis at the time of sample accordance with A.R.S. 36-495.02(A)(3).

(These parameters may include flow, dissolved oxygen, pH, temperature, and total residual chlorine.)

b. The Permittees must utilize analytical methods specified in this permit. If no test procedure is specified, the Permittees shall analyze the pollutant using:

i. A test procedure listed in 40 CFR 136 which is also approved under A.A.C. R9-14-610;

ii. An alternative test procedure approved by EPA as provided in 40 CFR 136 and which is also approved under A.A.C. R9-14-610;

iii. A test procedure listed in 40 CFR 136, with modifications allowed by EPA or approved as a method alteration by ADHS under A.A.C. R9-14-610C; or

iv. If no test procedure for a pollutant is available under (4)(b)(i) through (4)(b)(iii) above, any Method approved under A.A.C. R9-14-610(B) for wastewater may be used, except the use of field kits is not allowed unless otherwise specified in this permit. If there is no approved wastewater method for a parameter, any other method identified in 9 A.A.C. 14, Article 6 that will achieve appropriate detection and reporting limits may be used for analyses.

c. For results to be considered valid, all analytical work, including those tests conducted by the

Permittees at the time of sampling (see Part I1.A.4.a), shall meet quality control standards specified in the approved methods.

d. The Permittees shall use analytical methods with a Limit of Quantitation (LOQ) that is lower than the effluent limitations, Assessments Levels, Action Levels, or other water quality criteria, if any, specified in this permit. If all methods have LOQs higher than the applicable water quality criteria, the Permittees shall use the approved analytical method with the lowest LOQ.

e. The Permittees shall use a standard calibration curve when applicable to the method, where the lowest standard point is equal to or less than the LOQ.

f. If requested, the Permittees shall participate in the annual NPDES DMR/QA study and submit the results of this study to ADEQ and ADHS for all laboratories used in monitoring compliance with this permit.

5. Mercury Monitoring

The Permittees shall use an ADHS-certified low-level mercury analytical method such as EPA method

245.7 or 1631E to achieve a reporting limit at or below the discharge limitations or assessment levels for mercury as specified in this permit. The Permittees shall also use a "clean hands/dirty hands" sampling technique such as EPA Method 1669 if necessary to achieve these reporting limits.

6. Chlorine Monitoring

Because of the short holding time for chlorine, samples may be analyzed on-site using Hach Method No. 10014. Other methods are also acceptable for chlorine if the Method has a LOQ lower than discharge limits specified in this permit.

7. Metals Analyses

In accordance with 40 CFR 122.45(c), all effluent metals concentrations, with the exception of chromium VI, shall be measured as "total recoverable metals". Discharge Limits and Assessment Levels in this permit, if any, are for total metals, except for chromium VI for which the levels listed are dissolved.

B. Reporting of Monitoring Results

1. The Permittees shall report monitoring results from Tables 1 through 6 on Discharge Monitoring Report

(DMR) forms supplied by ADEQ, to the extent that the results may be entered on the forms. The

Permittees shall submit results of all monitoring required by this permit in a format that will allow direct comparison with the limitations and requirements ofthis permit. If no discharge occurs during a reporting period, the Permittees shall specify "No discharge" on the DMR.