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Utah Division of Water Quality
Statement of Basis
ADDENDUM
Wasteload Analysis and Antidegradation Level I Review
Date: December 9, 2024
Facility: Garland City Wastewater Treatment Facility
UPDES No. UT-0026085
Receiving Water: Malad River (2B, 3C)
This addendum summarizes the wasteload analysis that was performed to determine water
quality based effluent limits (WQBEL) for this discharge. Wasteload analyses are performed to
determine point source effluent limitations necessary to maintain designated beneficial uses by
evaluating projected effects of discharge concentrations on in-stream water quality. The
wasteload analysis also takes into account downstream designated uses (UAC R317-2-8).
Projected concentrations are compared to numeric water quality standards to determine
acceptability. The numeric criteria in this wasteload analysis may be modified by narrative
criteria and other conditions determined by staff of the Division of Water Quality.
Discharge
Outfall 001: Discharge is into Malad River, which discharges into Bear River. The design
capacity of the facility is 0.90 MGD, presumed to be the maximum daily design discharge. The
maximum monthly average design discharge is 0.45 MGD.
Receiving Water
The receiving water for Outfall 001 is Malad River, which is tributary to Bear River, which
drains to Bear River Bay of the Great Salt Lake.
Per UAC R317-2-13.3.a, the designated beneficial uses for Malad River and tributaries, from
confluence with Bear River to state line are 2B, 3C.
Class 2B - Protected for infrequent primary contact recreation. Also protected for
secondary contact recreation where there is a low likelihood of ingestion of water or a
low degree of bodily contact with the water. Examples include, but are not limited to,
wading, hunting, and fishing.
Class 3C - Protected for nongame fish and other aquatic life, including the necessary
aquatic organisms in their food chain.
Per UAC R317-2-13.3.a, the designated beneficial uses for Bear River and tributaries, from
Great Salt Lake to Utah-Idaho border, except as listed below are 2B,3B,3D,4.
Class 3B - Protected for warm water species of game fish and other warm water aquatic
life, including the necessary aquatic organisms in their food chain.
Utah Division of Water Quality
Wasteload Analysis
Garland City Wastewater Treatment Facility, UPDES No. UT0026034
Page 2 of 5
Class 3D – Protected for waterfowl, shore birds and other water-oriented wildlife not
included in Classes 3A, 3B, or 3C, including the necessary aquatic organisms in their
food chain.
Class 4 - Protected for agricultural uses including irrigation of crops and stock watering.
Protection of Downstream Uses
Per UAC R317-2-8, all actions to control waste discharges under these rules shall be modified as
necessary to protect downstream designated uses. For this discharge, numeric aquatic life use
criteria need to be met for both Malad River and Bear River.
Receiving Water Critical Flow
Typically, the critical flow for the wasteload analysis is considered the lowest stream flow for
seven consecutive days with a ten-year return frequency (7Q10). Due to a lack of flow records
for the source waters, the 20th percentile of flow measurements from water quality monitoring
conducted by DWQ was calculated to estimate seasonal critical flow in the receiving water
(Table 1). Measurements were collected from monitoring site DWQ 4902720 MALAD R AB
TREMONTON WWTP. The average seasonal value was calculated for each constituent with
available data in the receiving water.
Table 1: Malad River critical low flow from DWQ 4902720 MALAD R AB TREMONTON WWTP
Season Flow (cfs)
Summer 33.6
Fall 33.2
Winter 46.4
Spring 44.0
Total Maximum Daily Load (TMDL)
According to the Utah’s Final 2024 Integrated Report on Water Quality dated April 30, 2024, the
receiving water for the discharge, “Malad River and tributaries, from confluence with Bear River
to state line (Assessment Unit Malad River-1, AU ID: UT16010204-006_00)” was listed as “Not
Supporting” for Benthic Macroinvertebrates Bioassessments, E. coli, Thalium, and pH. A TMDL
is needed, however, the priority is set to “Low”. There was an approved TMDL completed in
2002 for Total Phosphorous.
The downstream reach “Bear River and tributaries, from Great Salt Lake to Utah-Idaho border,
except as listed below (Assessment Unit Bear River-2-2, AU ID: UT16010204-008_02)” was
listed as “Not Supporting” for Benthic Macroinvertebrates Bioassessments and Total Dissolved
Solids. A TMDL is needed, however, the priority is set to “Low”.
Mixing Zone
Per UAC R317-2-5, the maximum allowable mixing zone is 15 minutes of travel time for acute
conditions, not to exceed 50% of stream width, and 2,500 feet for chronic conditions. Water
quality standards must be met at the end of the mixing zone.
Utah Division of Water Quality
Wasteload Analysis
Garland City Wastewater Treatment Facility, UPDES No. UT0026034
Page 3 of 5
The actual length of the mixing zone was not delineated as part of this wasteload analysis;
however, it was presumed to remain within the maximum allowable mixing zone dimensions.
Acute limits were calculated using 50% of the annual critical low flow.
Parameters of Concern
The potential parameters of concern identified for the discharge/receiving water were total
suspended solids (TSS), dissolved oxygen (DO), BOD5, total phosphorus (TP), total nitrogen
(TN), total ammonia (TNH3), pH, and total dissolved solids (TDS), as determined in
consultation with the UPDES Permit Writer, the Utah Water Quality Assessment Reports, and
the industry SIC codes from https://www.osha.gov/data/sic-search.
Water Quality Modeling
A QUAL2Kw model of the Malad River downstream of the Tremonton WWTP was built and
calibrated by DWQ to synoptic survey data collected by DWQ staff in August of 2011. The
model extends 10.3 kilometers along Malad River downstream from the treatment facility
outfall. The calibrated model was extended approximately 5.5 kilometers upstream from the
Tremonton WWTP to the Garland WWTP and continues downstream approximately 4.8
kilometers from the Tremonton WWTP to the crossing at West 8800 North. The methods and
results of the model calibration are summarized in the QUAL2Kw Calibration Report for the
Malad River (DWQ 2019).
Receiving water quality data was obtained from monitoring site DWQ 4902720 MALAD R AB
TREMONTON WWTP. The average seasonal value was calculated for each constituent with
available data in the receiving water for each of the parameters.
Seasonal effluent flow and parameter concentrations were characterized using data from the
Garland WWTP facility discharge monitoring report (DMR). Monitoring site DWQ 4902710
TREMONTON WWTP was also used as a downstream point source. No other tributary inflows
or irrigation return flows were considered. The seasonal value was calculated for each
constituent with available data in the effluent discharge using the 80th percentile for acute
parameters and the average for chronic parameters.
The QUAL2Kw model was used for determining the WQBELs for parameters related to
eutrophication and in-stream DO criteria, as well as ammonia toxicity. Effluent concentrations
were adjusted so that water quality standards were not exceeded in the receiving water. Where
WQBELs exceeded secondary standards or technology based effluent limits (TBEL), the
concentration in the model was set at the secondary standard or TBEL. Fish early life stages
(ELS) are assumed absent.
The QUAL2Kw model was also used to determine the limits for ammonia. The water quality
standard for chronic ammonia toxicity is dependent on temperature and pH, and the water quality
standard for acute ammonia toxicity is dependent on pH. QUAL2Kw rates, input and output for
DO and eutrophication related constituents are summarized in Appendix A.
Utah Division of Water Quality
Wasteload Analysis
Garland City Wastewater Treatment Facility, UPDES No. UT0026034
Page 4 of 5
A mass balance mixing analysis was conducted for conservative constituents such as dissolved
metals. The WQBELs for conservative constituents are summarized in Appendix B.
The decay of chlorine from the treatment plant to the outfall at the river was estimated based on a
first-order decay equation. The analysis for total residual chlorine (TRC) is summarized in
Appendix C.
The calibration and wasteload models are available for review by request.
Whole Effluent Toxicity (WET) Limits
The percent of effluent in the receiving water in a fully mixed condition, and acute and chronic
dilution in a not fully mixed condition are calculated in the WLA in order to generate WET
limits. The LC50 (lethal concentration, 50%) percent effluent for acute toxicity and the IC25
(inhibition concentration, 25%) percent effluent for chronic toxicity, as determined by the WET
test, needs to be below the WET limits, as determined by the WLA. The WET limit for LC50 is
typically 100% effluent and does not need to be determined by the WLA. WET limits are
provided in Table 2.
Table 2: WET Limits for IC25
Season Percent
Effluent
Summer 2%
Fall 2%
Winter 1%
Spring 2%
Effluent Limits
Eutrophication and dissolved oxygen in the receiving water were evaluated using the QUAL2Kw
model. A DO sag was not observed downstream in the Malad River. Algal growth appeared to
be light limited likely as a result of the high TSS. However, the DO concentration was not
predicted to exceed water quality criteria within the model extents. Therefore, limits beyond
secondary standards are not required for DO and BOD5.
The complete list of WQBELs is listed in Appendices A, B, and C. However, all WQBELs
greater than the current effluent limits listed in the Permit, revert to the previous limits.
Antidegradation Level I Review
The objective of the Level I ADR is to ensure the protection of existing uses, defined as the
beneficial uses attained in the receiving water on or after November 28, 1975. No evidence is
known that the existing uses deviate from the designated beneficial uses for the receiving water.
Therefore, the beneficial uses will be protected if the discharge remains below the WQBELs
presented in this wasteload.
A Level II Antidegradation Review (ADR) is not required for this discharge, as pollutant
concentration and load are not proposed to increase beyond the design capacity of the facility
under this permit renewal.
Utah Division of Water Quality
Wasteload Analysis
Garland City Wastewater Treatment Facility, UPDES No. UT0026034
Page 5 of 5
Prepared by:
Christopher L. Shope, PhD
Standards and Technical Services Section
Documents
WLA Document: 241209-Garland_WWTP_Q2Kw_WLA_2024.docx
QUAL2Kw Calibration Model: garland_q2kw_cal_2019.xlsm
QUAL2Kw Wasteload Model: 241209-Garland_WWTP_Q2Kw_WLA_2024.xlsm
References:
Neilson, B.T., A.J. Hobson, N. von Stackelberg, M. Shupryt, and J.D. Ostermiller. 2012. Using QUAL2K Modeling
to Support Nutrient Criteria Development and Wasteload Analyses in Utah. 2012.
https://documents.deq.utah.gov/legacy/programs/water-quality/standards-technical-
services/docs/2012/12Dec/UtahQ2kModelingDataGuidance-Final_12-12-12.pdf
Utah Division of Water Quality. 2002. Lower Bear River Watershed Restoration Action Strategy.
Utah Division of Water Quality. 2012. Field Data Collection for QUAL2Kw Model Build and Calibration Standard
Operating Procedures Version 1.0.
https://documents.deq.utah.gov/legacy/programs/water-quality/standards-technical-
services/docs/2012/05May/SOP_QUAL2Kw_Data_Collection_V1_2012-05-30.pdf
Utah Division of Water Quality. 2019. QUAL2Kw Calibration Report for the Malad River.
Utah Division of Water Quality. 2021. Utah Wasteload Analysis Procedures Version 2.0.
https://documents.deq.utah.gov/water-quality/standards-technical-services/DWQ-2021-000684.pdf
Utah Division of Water Quality. 2024. Final 2024 Integrated Report on Water Quality. https://lf-
public.deq.utah.gov/WebLink/DocView.aspx?id=87957&repo=Public&searchid=fcd9ea4c-51e1-4227-aa29-
fb1921c2cc19&cr=1
Utah Division of Water Quality
WASTELOAD ANALYSIS [WLA]Date: 1/8/2025
Appendix A: QUAL2Kw Analysis for Eutrophication
Discharging Facility: Garland WWTP
UPDES No: UT-0026034
Permit Flow [MGD]: 0.5 Maximum Monthly Flow
0.9 Maximum Daily Flow
Receiving Water: Malad River
Stream Classification: 2B,3C
Stream Flows [cfs]: 33.6 Summer (July-Sept) Critical Low Flow
33.2 Fall (Oct-Dec)
46.4 Winter (Jan-Mar)
44.0 Spring (Apr-June)
Fully Mixed: NO
Acute River Width: 50%
Chronic River Width: 100%
Modeling Information
A QUAL2Kw model was used to determine these effluent limits.
Model Inputs
The following is upstream and discharge information that was utilized as inputs for the analysis.
Dry washes are considered to have an upstream flow equal to the flow of the discharge.
Headwater Inputs Summer Fall Winter Spring
Flow (cfs)33.6 33.2 46.4 44.0
Temperature (deg C)18.8 8.0 4.7 14.3
Specific Conductance (µmhos)4586 4565 3793 4528
Inorganic Suspended Solids (mg/L)158.9 65.1 92.6 107.7
Dissolved Oxygen (mg/L)8.1 9.4 10.1 8.2
CBOD5 (mg/L)4.1 2.2 2.0 3.5
Organic Nitrogen (mg/L)2.863 1.270 1.290 1.808
NH4-Nitrogen (mg/L)0.077 0.078 0.102 0.073
NO3-Nitrogen (mg/L)2.387 1.308 0.671 1.275
Organic Phosphorus (mg/L)0.049 0.000 0.000 0.074
Inorganic Ortho-Phosphorus (mg/L)0.094 0.077 0.146 0.085
Phytoplankton (µg/L)0.0 0.0 0.0 0.0
Detritus [POM] (mg/L)17.2 2.9 8.4 14.2
Alkalinity (mg/L)356 351 352 366
pH 8.1 8.0 8.1 8.1
Discharge Inputs Summer Fall Winter Spring
Flow (cfs)0.5 0.5 0.5 0.5
Temperature (deg C)17.7 12.6 9.4 13.7
Specific Conductance (µmhos)1565 1589 1535 1492
Inorganic Suspended Solids (mg/L)1.3 1.3 5.3 4.9
Dissolved Oxygen (mg/L)5.0 5.0 5.0 5.0
CBOD5 (mg/L)25.0 25.0 25.0 25.0
Organic Nitrogen (mg/L)10.277 5.600 11.960 11.960
NH4-Nitrogen (mg/L)1.000 2.500 15.000 15.000
NO3-Nitrogen (mg/L)2.542 0.301 2.499 3.138
Organic Phosphorus (mg/L)0.000 0.000 0.000 0.000
Inorganic Ortho-Phosphorus (mg/L)1.000 1.000 1.000 1.000
Phytoplankton (µg/L)0.000 0.000 0.000 0.000
Detritus [POM] (mg/L)0.000 0.000 0.000 0.000
Alkalinity (mg/L)387 377 412 399
pH 3.6 2.6 5.3 7.9
Page A-1
Utah Division of Water Quality
Little Spring Creek Inputs Summer Fall Winter Spring
Flow (cfs)1.7 1.1 1.1 1.2
Temperature (deg C)17.7 12.6 9.4 13.7
Specific Conductance (µmhos)1565 1589 1535 1492
Inorganic Suspended Solids (mg/L)9.1 5.0 8.3 2.6
Dissolved Oxygen (mg/L)6.4 7.0 7.3 7.0
CBOD5 (mg/L)19.3 14.9 27.1 18.1
Organic Nitrogen (mg/L)1.153 1.604 4.000 0.958
NH4-Nitrogen (mg/L)1.237 2.771 3.256 2.184
NO3-Nitrogen (mg/L)2.398 4.689 2.137 1.567
Organic Phosphorus (mg/L)0.481 1.748 0.000 1.257
Inorganic Ortho-Phosphorus (mg/L)2.157 2.350 4.763 1.917
Phytoplankton (µg/L)0.0 0.0 0.0 0.0
Detritus [POM] (mg/L)0.0 0.0 0.0 0.0
Alkalinity (mg/L)375 375 375 375
pH 7.8 7.7 7.7 7.8
Big Spring Creek Inputs Summer Fall Winter Spring
Flow (cfs)0.0 0.0 0.0 0.0
Temperature (deg C)0.0 0.0 0.0 0.0
Specific Conductance (µmhos)0 0 0 0
Inorganic Suspended Solids (mg/L)0.0 0.0 0.0 0.0
Dissolved Oxygen (mg/L)0.0 0.0 0.0 0.0
CBOD5 (mg/L)0.0 0.0 0.0 0.0
Organic Nitrogen (mg/L)0.000 0.000 0.000 0.000
NH4-Nitrogen (mg/L)0.000 0.000 0.000 0.000
NO3-Nitrogen (mg/L)0.000 0.000 0.000 0.000
Organic Phosphorus (mg/L)0.000 0.000 0.000 0.000
Inorganic Ortho-Phosphorus (mg/L)0.000 0.000 0.000 0.000
Phytoplankton (µg/L)0.0 0.0 0.0 0.0
Detritus [POM] (mg/L)0.0 0.0 0.0 0.0
Alkalinity (mg/L)0 0 0 0
pH 0.0 0.0 0.0 0.0
All model numerical inputs, intermediate calculations, outputs and graphs are available for
discussion, inspection and copy at the Division of Water Quality.
Page A-2
Utah Division of Water Quality
Effluent Limitations
Current State water quality standards are required to be met under a variety of conditions including
in-stream flows targeted to the 7-day, 10-year low flow (R317-2-9).
Other conditions used in the modeling effort reflect the environmental conditions expected
at low stream flows.
Effluent Limitations based upon Water Quality Standards for DO
and Ammonia Toxicity
In-stream criteria of downstream segments for Dissolved Oxygen will be met with an effluent
limitation as follows:
Chronic Standard Summer Fall Winter Spring
Flow (MGD) N/A 0.5 0.5 0.5 0.5
NH4-Nitrogen (mg/L)Varies 1.0 2.5 15.0 15.0
CBOD5 (mg/L)N/A 25.0 25.0 25.0 25.0
Dissolved Oxygen [30-day Ave] (mg/L) 5.5 5.0 5.0 5.0 5.0
Acute Standard Summer Fall Winter Spring
Flow (cfs) N/A 0.9 0.9 0.9 0.9
NH4-Nitrogen (mg/L)Varies 12.0 17.0 25.0 30.0
CBOD5 (mg/L)N/A 35.0 35.0 35.0 35.0
Dissolved Oxygen [Minimum] (mg/L) 5.0 5.0 5.0 5.0 5.0
Summary Comments
The mathematical modeling and best professional judgement indicate that violations of receiving
water beneficial uses with their associated water quality standards, including important down-
stream segments, will not occur for the evaluated parameters of concern as discussed above if the
effluent limitations indicated above are met.
Page A-3
Utah Division of Water Quality
Coefficients and Other Model Information
Parameter Value Units
Stoichiometry:
Carbon 40 gC
Nitrogen 7.2 gN
Phosphorus 1 gP
Dry weight 100 gD
Chlorophyll 1 gA
Inorganic suspended solids:
Settling velocity 0.001 m/d
Oxygen:
Reaeration model Churchill
Temp correction 1.024
Reaeration wind effect None
O2 for carbon oxidation 2.69 gO2/gC
O2 for NH4 nitrification 4.57 gO2/gN
Oxygen inhib model CBOD oxidation Exponential
Oxygen inhib parameter CBOD oxidation 0.60 L/mgO2
Oxygen inhib model nitrification Exponential
Oxygen inhib parameter nitrification 0.60 L/mgO2
Oxygen enhance model denitrification Exponential
Oxygen enhance parameter denitrification 0.60 L/mgO2
Oxygen inhib model phyto resp Exponential
Oxygen inhib parameter phyto resp 0.60 L/mgO2
Oxygen enhance model bot alg resp Exponential
Oxygen enhance parameter bot alg resp 0.60 L/mgO2
Slow CBOD:
Hydrolysis rate 0 /d
Temp correction 1.047
Oxidation rate 0.103 /d
Temp correction 1.047
Fast CBOD:
Oxidation rate 10 /d
Temp correction 1.047
Organic N:
Hydrolysis 0.2903475 /d
Temp correction 1.07
Settling velocity 0.242158 m/d
Ammonium:
Nitrification 0.2693435 /d
Temp correction 1.07
Nitrate:
Denitrification 1.6900865 /d
Temp correction 1.07
Sed denitrification transfer coeff 0.21487 m/d
Temp correction 1.07
Organic P:
Hydrolysis 0.228215 /d
Temp correction 1.07
Settling velocity 0.05548 m/d
Inorganic P:
Settling velocity 0.85204 m/d
Sed P oxygen attenuation half sat constant 1.98778 mgO2/L
Page A-4
Utah Division of Water Quality
Phytoplankton:
Max Growth rate 2.8944 /d
Temp correction 1.07
Respiration rate 0.480803 /d
Temp correction 1.07
Death rate 0.86518 /d
Temp correction 1
Nitrogen half sat constant 15 ugN/L
Phosphorus half sat constant 2 ugP/L
Inorganic carbon half sat constant 1.30E-05 moles/L
Phytoplankton use HCO3- as substrate Yes
Light model Smith
Light constant 57.6 langleys/d
Ammonia preference 25.4151 ugN/L
Settling velocity 0.468545 m/d
Bottom Plants:
Growth model Zero-order
Max Growth rate 72.858765 gD/m2/d or /d
Temp correction 1.07
First-order model carrying capacity 100 gD/m2
Basal respiration rate 0.1996688 /d
Photo-respiration rate parameter 0.01 unitless
Temp correction 1.07
Excretion rate 0.225035 /d
Temp correction 1.07
Death rate 1.1864 /d
Temp correction 1.07
External nitrogen half sat constant 424.656 ugN/L
External phosphorus half sat constant 63.89725 ugP/L
Inorganic carbon half sat constant 3.89E-05 moles/L
Bottom algae use HCO3- as substrate Yes
Light model Smith
Light constant 93.4186 mgO^2/L
Ammonia preference 19.602 ugN/L
Subsistence quota for nitrogen 0.3791592 mgN/gD
Subsistence quota for phosphorus 0.1186205 mgP/gD
Maximum uptake rate for nitrogen 1474.3665 mgN/gD/d
Maximum uptake rate for phosphorus 111.866 mgP/gD/d
Internal nitrogen half sat ratio 3.167674
Internal phosphorus half sat ratio 2.9784295
Nitrogen uptake water column fraction 1
Phosphorus uptake water column fraction 1
Detritus (POM):
Dissolution rate 0.168998 /d
Temp correction 1.07
Settling velocity 0.206573 m/d
pH:
Partial pressure of carbon dioxide 370 ppm
Atmospheric Inputs:Summer Fall Winter Spring
Min. Air Temperature, F 52.3 26.2 19.4 41.7
Max. Air Temperature, F 85.5 49.4 39.7 69.8
Dew Point, Temp., F 53.6 31.0 25.1 45.4
Wind, ft./sec. @ 21 ft. 4.9 3.6 3.6 5.8
Cloud Cover, % 18% 44% 46% 26%
Other Inputs:
Bottom Algae Coverage 10%
Bottom SOD Coverage 100%
Prescribed SOD, gO2/m^2/day 0
Page A-5
Utah Division of Water Quality
WASTELOAD ANALYSIS [WLA]Date: 1/8/2025
Appendix B: Mass Balance Mixing Analysis for Conservative Constituents
Discharging Facility: Garland WWTP
UPDES No: UT-0026034
Permit Flow [MGD]: 0.5 Maximum Monthly Flow
0.9 Maximum Daily Flow
Receiving Water: Malad River
Stream Classification: 2B,3C
Stream Flows [cfs]: 33.6 Summer (July-Sept) Critical Low Flow
33.2 Fall (Oct-Dec)
46.4 Winter (Jan-Mar)
44.0 Spring (Apr-June)
Fully Mixed: NO
Acute River Width: 50%
Chronic River Width: 100%
Acute Combined Flow [cfs] 18.17
Chronic Combined Flow [cfs] 34.26
Modeling Information
A simple mixing analysis was used to determine these effluent limits.
Model Inputs
The following is upstream and discharge information that was utilized as inputs for the analysis.
Dry washes are considered to have an upstream flow equal to the flow of the discharge.
Headwater/Upstream Information
DWQ 4902720
MALAD R AB
TREMONTON
WWTP
DWQ 4902710
TREMONTON
WWTP
cfs cfs
Summer 33.6 1.7
Fall 33.2 1.1
Winter 46.4 1.1
Spring 44.0 1.2
Discharge Information
Flow
MGD
Maximum Daily 0.9
Maximum Monthly 0.5
All model numerical inputs, intermediate calculations, outputs and graphs are available for
discussion, inspection and copy at the Division of Water Quality.
Page B-1
Utah Division of Water Quality
Effluent Limitations
Current State water quality standards are required to be met under a variety of conditions including
in-stream flows targeted to the 7-day, 10-year low flow (R317-2-9).
Other conditions used in the modeling effort reflect the environmental conditions expected
at low stream flows.
Effluent Limitations for Protection of Recreation (Class 2B Waters)
Physical
Parameter Maximum Concentration
pH Minimum 6.5
pH Maximum 9.0
Bacteriological
E. coli (30 Day Geometric Mean) 206 (#/100 mL)
E. coli (Maximum) 668 (#/100 mL)
Effluent Limitations for Protection of Aquatic Wildlife (Class 3D Waters)
Inorganics Chronic Standard (4 Day Average) Acute Standard (1 Hour Average)
Parameter Standard Standard
Phenol (mg/L) 0.010
Hydrogen Sulfide (Undissociated) [mg/L] 0.002
Total Recoverable Metals Chronic Standard (4 Day Average)1 Acute Standard (1 Hour Average)1
Parameter Standard Background Limit Standard Background2 Limit
Aluminum (µg/L)N/A3 20.6 N/A 750 69.0 8957
Arsenic (µg/L) 150 0.9 7335 340 0.9 4426
Cadmium (µg/L) 0.6 0.1 26.8 7.7 0.1 99.8
Chromium VI (µg/L) 11.0 1.9 449.7 16.0 1.9 185.9
Chromium III (µg/L) 231 1.9 11259 1,773 1.9 23122
Copper (µg/L) 29.3 2.0 1344.4 49.6 2.0 623.5
Cyanide (µg/L)2 5.2 3.5 87.9 22.0 3.5 245.2
Iron (µg/L) 1,000 30.0 12690
Lead (µg/L) 10.9 0.7 504.8 281 0.7 3657
Mercury (µg/L)2 0.012 0.008 0.203 2.4 0.0 31.2
Nickel (µg/L) 168 4.6 8047 1,513 4.6 19691
Selenium (µg/L) 4.6 1.0 178.1 18.4 1.0 228.1
Silver (µg/L) 34.9 0.5 449.6
Tributylin (µg/L)2 0.072 0.048 1.217 0.46 0.048 5.423
Zinc (µg/L) 382 9.3 18369 379 9.3 4839
1: Based upon a Hardness of 400 mg/l as CaCO3.
2: Background concentration assumed 67% of chronic standard.
3: Where the pH is equal to or greater than 7.0 and the hardness is equal to or greater than 50 ppm as CaC03 in the receiving water after mixing,
the 87 ug/L chronic criterion (expressed as total recoverable) will not apply, and aluminum will be regulated based on compliance with the 750 ug/L
acute aluminum criterion (expressed as total recoverable).
Page B-2
Utah Division of Water Quality
Organics [Pesticides] Chronic Standard (4 Day Average) Acute Standard (1 Hour Average)
Parameter Standard Background1 Limit Standard Background1 Limit
Aldrin (µg/L) 1.5 1.0 7.5
Chlordane (µg/L) 0.0043 0.0029 0.0727 1.2 0.0 15.6
DDT, DDE (µg/L) 0.001 0.001 0.017 0.55 0.00 7.17
Diazinon (µg/L) 0.17 0.11 2.87 0.17 0.11 0.85
Dieldrin (µg/L) 0.0056 0.0038 0.0947 0.24 0.00 3.09
Endosulfan, a & b (µg/L) 0.056 0.038 0.947 0.11 0.04 0.98
Endrin (µg/L) 0.036 0.024 0.609 0.086 0.024 0.832
Heptachlor & H. epoxide (µg/L) 0.0038 0.0025 0.0643 0.26 0.00 3.36
Lindane (µg/L) 0.08 0.05 1.35 1.0 0.1 12.4
Methoxychlor (µg/L) 0.03 0.02 0.15
Mirex (µg/L) 0.001 0.001 0.005
Nonylphenol (µg/L) 6.6 4.4 111.6 28.0 4.4 312.2
Parathion (µg/L) 0.0130 0.0087 0.2198 0.066 0.009 0.756
PCB's (µg/L) 0.014 0.009 0.237
Pentachlorophenol (µg/L) 15.0 10.1 253.63 19.0 10.1 126.9
Toxephene (µg/L) 0.0002 0.0001 0.0034 0.73 0.00 9.53
1: Background concentration assumed 67% of chronic standard
Radiological Maximum Concentration
Parameter Standard Background1 Limit
Gross Alpha (pCi/L) 15 10.1 253.63
1: Background concentration assumed 67% of chronic standard.
Effluent Limitation for Protection of Agriculture (Class 4 Waters)
Maximum Concentration
Parameter Standard Background1 Limit
Total Dissolved Solids (mg/L) 1,200 808 20098
Boron (µg/L) 75.0 99.8 -1120.6
Arsenic (µg/L) 100 0.9 4875.1
Cadmium (µg/L) 10.0 6.7 169.1
Chromium (µg/L) 100 1.9 4829.2
Copper (µg/L) 200 2.0 9745.2
Lead (µg/L) 100 0.7 4887.1
Selenium (µg/L) 50.0 1.0 2412.2
Gross Alpha (pCi/L)1 15.0 10.1 253.6
1: Background concentration assumed 67% of chronic standard.
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