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HomeMy WebLinkAboutDWQ-2024-000240 Page 1 of 4 Utah Division of Water Quality Statement of Basis ADDENDUM Wasteload Analysis and Antidegradation Level I Review Date: January 12, 2024 Prepared by: Suzan Tahir Standards and Technical Services Facility: Swift Beef Company UPDES No. UT000281 Receiving water: Ditch => South Fork Spring Creek 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 001 Treatment plant discharge 2.0 MGD Receiving Water Swift Beef Co. discharges into a complex ditch system that runs for approximately 4.5 miles before coalescing as the South Fork of Spring Creek at Highway 89. Therefore, all effluent limits provided to this facility must be met at South Fork of Spring Creek at Highway 89. As per UAC R317-2-13.9, all irrigation canals and ditches statewide, except as otherwise designated are 2B, 3E and 4. As per R317-2-13.3(a), the designated beneficial uses of Little Bear River and tributaries, from Cutler Reservoir to headwaters are 2B, 3A, 3D, 4. • 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 3A - Protected for cold water species of game fish and other cold water aquatic life, including the necessary aquatic organisms in their food chain. Utah Division of Water Quality Wasteload Analysis Swift Beef Company UPDES No. UT000281 Page 2 of 4 • 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 3E - Severely habitat-limited waters. Narrative standards will be applied to protect these waters for aquatic wildlife. • Class 4 - Protected for agricultural uses including irrigation of crops and stock watering. Data from the following stations was used to populate the model: Table 1. Data Sources Station # Station Name Data Period 4904840 DITCH AB EA MILLER SC-12 2012-2023 4905540 E. A. MILLER CO. EFFLUENT 2012-2023 4904810 SPRING CK SC-9 2012-2023 4905520 HYRUM WWTP 2012-2023 Data was segmented into two seasons; Irrigation (April-September) and Non-irrigation (October- May). Significant changes were made to Swift Beef Company’s treatment plant in 2011. In order to be reflective of current conditions, only data from 2012 to present was used from those stations downstream of the facility. 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, the 20th percentile of available flow measurements was calculated for the period of record to approximate the critical flow condition. Calculated critical low flow conditions are as follows: Table 2. Critical low flow conditions Station # Station Name Low Flow (cfs) 20th percentile Irrigation Season Non-irrigation Season 4904840 DITCH AB EA MILLER SC-12 0.045 0.046 4904810 SPRING CK SC-9 3.924 1.441 4905520 HYRUM WWTP 0.000 1.309 4904940 S FK SPRING CK @ US 89 XING 6.7 3.8 Ambient water quality for the receiving water/discharge was characterized using data from 4904840 for the time periods as presented in Table 1. TMDL Spring Creek-Hyrum (UT16010203-008_00, Spring Creek and tributaries from confluence with Little Bear River to headwaters) is currently listed as impaired in Utah's 2022 Integrated Report Utah Division of Water Quality Wasteload Analysis Swift Beef Company UPDES No. UT000281 Page 3 of 4 for E. coli, temperature, ammonia and total dissolved solids (TDS). TMDL's for Spring Creek were approved by the USEPA (U.S. Environmental Protection Agency) in 2002 which addressed impairments for dissolved oxygen, ammonia, E. coli and total phosphorus (TP). The TP target/endpoint was set at 0.05 mg/l at the watershed outlet. Since that time, major upgrades have been made to both Hyrum City’s WWTP and Swift Beef Company’s treatment plant, resulting in greatly improved effluent quality. A monitoring plan was developed to track the instream water quality improvements from the treatment facility upgrades. Spring Creek has not been removed from the impaired list, however water quality improvements continue to be seen and Best Management Practices continue to be applied to agricultural lands in the basin. 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, 3A numeric aquatic life use criteria apply to the immediate receiving water (S FK SPRING CK @ US 89 XING). Mixing Zone 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, per UAC R317-2-5. Water quality standards must be met at the end of the mixing zone. Because the receiving water is a ditch that flows for several miles with multiple inputs, the combined flows are considered to be totally mixed. Chronic and acute limits were calculated using 100% of the seasonal critical low flow. Parameters of Concern The potential parameters of concern identified for the discharge/receiving water were E. coli, TDS, phosphorous and ammonia, as determined in consultation with the UPDES Permit Writer. Additional parameters of concern may become apparent as a result of reasonable potential analysis, technology-based standards, or other factors as determined by the UPDES Permit Writer. 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. IC25 WET limits for Outfall 001: Irrigation Season 32.0 % effluent. Non-Irrigation Season 45.0 % effluent. Utah Division of Water Quality Wasteload Analysis Swift Beef Company UPDES No. UT000281 Page 4 of 4 Wasteload Allocation Methods Swift Beef Co discharges to a very complex system of irrigational canals, ditches and return flows As a result the Utah River’s model and the QUAL2Kw model were both 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. Effluent limits were determined for conservative constituents using a simple mass balance mixing analysis (UDWQ 2012). The mass balance analysis is summarized in the Wasteload Addendum. Models and supporting documentation are available for review upon request. 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 facility. The proposed permit is a simple renewal of an existing UPDES permit. No increase in flow or concentration of pollutants over those authorized in the the existing permit is being requested. Documents: WLA Document : SwiftBeef_WLADoc_1-12-2024.docx Wasteload Analysis and Addendums: SwiftBeef_WLA_NonIrrig_1-12-24.xlsm; SwiftBeef_WLA_Irrig_1-12-24.xlsm SwiftBeef_Appendix A_1-12-24.pdf SwiftBeef_Appendix B_1-12-24.pdf References: Utah Division of Water Quality. 2022. Final 2022 Integrated Report on Water Quality Utah Division of Water Quality. 2021. Utah Wasteload Analysis Procedures Version 2.0. Utah Division of Water Quality WASTELOAD ANALYSIS [WLA]Date:1/9/2024 Appendix A: QUAL2Kw Analysis for Eutrophication Discharging Facility:Swift Beef Co. UPDES No:UT-0000281 Permit Flow [MGD]:2.00 Maximum Monthly Flow 2.98 Maximum Daily Flow Receiving Water:Ditch to So. Fork of Spring Creek Stream Classification:2B, 3A, 3D, 3E, 4 Stream Flows [cfs]:0.045 Summer (July-Sept)Critical Low Flow Fall (Oct-Dec) 0.046 Winter (Jan-Mar) Spring (Apr-June) Fully Mixed:YES Acute River Width:100% 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)0.05 0.00 0.05 0.00 Temperature (deg C)13.4 0.0 3.9 0.0 Specific Conductance (µmhos)2154 0 2131 0 Inorganic Suspended Solids (mg/L)7.4 0.0 1.9 0.0 Dissolved Oxygen (mg/L)6.4 0.0 12.2 0.0 CBOD5 (mg/L)7.0 0.0 5.3 0.0 Organic Nitrogen (mg/L)3.270 0.000 3.950 0.000 NH4-Nitrogen (mg/L)0.510 0.000 0.030 0.000 NO3-Nitrogen (mg/L)1.380 0.000 3.380 0.000 Organic Phosphorus (mg/L)0.030 0.000 0.010 0.000 Inorganic Ortho-Phosphorus (mg/L)2.010 0.000 1.340 0.000 Phytoplankton (µg/L)8.1 0.0 3.0 0.0 Detritus [POM] (mg/L)0.8 0.0 0.2 0.0 Alkalinity (mg/L)463 0 491 0 pH 8.1 0.0 8.2 0.0 Discharge Inputs Summer Fall Winter Spring Flow (cfs)2.0 0.0 2.0 0.0 Temperature (deg C)31.6 0.0 32.3 0.0 Specific Conductance (µmhos)4597 0 5032 0 Inorganic Suspended Solids (mg/L)7.6 0.0 6.8 0.0 Dissolved Oxygen (mg/L)8.0 0.0 8.0 0.0 CBOD5 (mg/L)25.0 0.0 25.0 0.0 Organic Nitrogen (mg/L)1.130 0.000 1.560 0.000 NH4-Nitrogen (mg/L)7.000 0.000 10.000 0.000 NO3-Nitrogen (mg/L)51.130 0.000 39.590 0.000 Organic Phosphorus (mg/L)0.350 0.000 0.270 0.000 Inorganic Ortho-Phosphorus (mg/L)0.200 0.000 0.340 0.000 Phytoplankton (µg/L)0.000 0.000 0.000 0.000 Detritus [POM] (mg/L)0.840 0.000 0.750 0.000 Alkalinity (mg/L)600 0 450 0 pH 7.3 0.0 7.2 0.0 Page A-1 Utah Division of Water Quality Spring Ck (SC-9)Summer Fall Winter Spring Flow (cfs)3.9 0.0 2.8 0.0 Temperature (deg C)14.7 0.0 5.3 0.0 Specific Conductance (µmhos)606 0 1158 0 Inorganic Suspended Solids (mg/L)72.2 0.0 17.2 0.0 Dissolved Oxygen (mg/L)9.3 0.0 12.5 0.0 CBOD5 (mg/L)1.0 0.0 1.0 0.0 Organic Nitrogen (mg/L)0.500 0.000 0.500 0.000 NH4-Nitrogen (mg/L)0.080 0.000 0.070 0.000 NO3-Nitrogen (mg/L)2.730 0.000 6.320 0.000 Organic Phosphorus (mg/L)0.090 0.000 0.040 0.000 Inorganic Ortho-Phosphorus (mg/L)0.090 0.000 0.180 0.000 Phytoplankton (µg/L)4.0 0.0 4.0 0.0 Detritus [POM] (mg/L)8.0 0.0 1.9 0.0 Alkalinity (mg/L)235 0 235 0 pH 8.3 0.0 8.0 0.0 Hyrum Inputs Summer Fall Winter Spring Flow (cfs)0.0 0.0 1.3 0.0 Temperature (deg C)16.5 0.0 14.9 0.0 Specific Conductance (µmhos)1555 0 1374 0 Inorganic Suspended Solids (mg/L)1.8 0.0 3.2 0.0 Dissolved Oxygen (mg/L)6.5 0.0 6.4 0.0 CBOD5 (mg/L)2.5 0.0 4.7 0.0 Organic Nitrogen (mg/L)0.440 0.000 2.830 0.000 NH4-Nitrogen (mg/L)0.140 0.000 1.470 0.000 NO3-Nitrogen (mg/L)6.810 0.000 8.340 0.000 Organic Phosphorus (mg/L)0.100 0.000 0.210 0.000 Inorganic Ortho-Phosphorus (mg/L)0.009 0.000 0.190 0.000 Phytoplankton (µg/L)4.0 0.0 4.0 0.0 Detritus [POM] (mg/L)0.2 0.0 0.4 0.0 Alkalinity (mg/L)350 0 350 0 pH 7.9 0.0 7.5 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 2.0 0.0 2.0 0.0 NH4-Nitrogen (mg/L)Varies 7.0 0.0 10.0 0.0 BOD5 (mg/L)N/A 25.0 0.0 25.0 0.0 Dissolved Oxygen [30-day Ave] (mg/L) 6.5 8.0 0.0 8.0 0.0 Acute Standard Summer Fall Winter Spring Flow (cfs)N/A 3.0 0.0 3.0 0.0 NH4-Nitrogen (mg/L)Varies 20.0 0.0 22.0 0.0 BOD5 (mg/L)N/A 35.0 0.0 35.0 0.0 Dissolved Oxygen [Minimum] (mg/L) 5.0 8.0 0.0 8.0 0.0 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 Internal 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 0.93052954 /d Temp correction 1.07 Settling velocity 0.075512 m/d Ammonium: Nitrification 8.5417597 /d Temp correction 1.07 Nitrate: Denitrification 1.22459618 /d Temp correction 1.07 Sed denitrification transfer coeff 0.22519 m/d Temp correction 1.07 Organic P: Hydrolysis 0.02341756 /d Temp correction 1.07 Settling velocity 0.012595 m/d Inorganic P: Settling velocity 0.173285 m/d Sed P oxygen attenuation half sat constant 0.37624 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 9.723175 gD/m2/d or /d Temp correction 1.07 First-order model carrying capacity 100 gD/m2 Basal respiration rate 0.5949614 /d Photo-respiration rate parameter 0.01 unitless Temp correction 1.07 Excretion rate 0.114068 /d Temp correction 1.07 Death rate 0.016856 /d Temp correction 1.07 External nitrogen half sat constant 428.4848 ugN/L External phosphorus half sat constant 95.6559 ugP/L Inorganic carbon half sat constant 3.16E-05 moles/L Bottom algae use HCO3- as substrate Yes Light model Smith Light constant 45.7548 mgO^2/L Ammonia preference 18.969 ugN/L Subsistence quota for nitrogen 11.7113 mgN/gD Subsistence quota for phosphorus 2.55002 mgP/gD Maximum uptake rate for nitrogen 880.0625 mgN/gD/d Maximum uptake rate for phosphorus 73.4256 mgP/gD/d Internal nitrogen half sat ratio 1.16297 Internal phosphorus half sat ratio 4.8781425 Nitrogen uptake water column fraction 1 Phosphorus uptake water column fraction 1 Detritus (POM): Dissolution rate 2.196361 /d Temp correction 1.07 Settling velocity 0.89671 m/d pH: Partial pressure of carbon dioxide 370 ppm Atmospheric Inputs:Summer Fall Winter Spring Min. Air Temperature, F 57.5 27.9 19.8 35.9 Max. Air Temperature, F 85.7 45.5 36.9 57.9 Dew Point, Temp., F 55.7 30.9 22.4 38.9 Wind, ft./sec. @ 21 ft.2.0 2.0 2.0 2.0 Cloud Cover, %10%10%10%10% Other Inputs: Bottom Algae Coverage 50% Bottom SOD Coverage 50% Prescribed SOD, gO2/m^2/day 0.001 Page A-5 Utah Division of Water Quality WASTELOAD ANALYSIS [WLA]Date:1/9/2024 Appendix B: Mass Balance Mixing Analysis for Conservative Constituents Discharging Facility:Swift Beef Co. UPDES No:UT-0000281 Permit Flow [MGD]:2.00 Maximum Monthly Flow 2.98 Maximum Daily Flow Receiving Water:Ditch to So. Fork of Spring Creek Stream Classification:2B, 3A, 3D, 3E, 4 Stream Flows [cfs]:0.045 Summer (July-Sept) Critical Low Flow 0.000 Fall (Oct-Dec) 0.046 Winter (Jan-Mar) 0.000 Spring (Apr-June) Fully Mixed:YES Acute River Width:100% Chronic River Width:100% 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 Spring Creek (SC-12) cfs Summer 0.045 Fall 0.000 Winter 0.046 Spring 0.000 Discharge Information Flow MGD Maximum Daily 2.98 Maximum Monthly 2.00 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 (30 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 69.0 757 Arsenic (µg/L)150 0.9 152 340 0.9 343 Cadmium (µg/L)0.5 0.1 0.5 5.7 0.1 5.8 Chromium VI (µg/L)11.0 1.9 11.1 16.0 1.9 16.1 Chromium III (µg/L)179 1.9 182 1,378 1.9 1,392 Copper (µg/L)22.5 2.0 22.8 37.1 2.0 37.5 Cyanide (µg/L)2 5.2 3.5 5.2 22.0 3.5 22.2 Iron (µg/L)1,000 30.0 1,009 Lead (µg/L)8.0 0.7 8.1 204 0.7 206 Mercury (µg/L)2 0.012 0.008 0.012 2.4 0.0 2.4 Nickel (µg/L)130 4.6 131 1,166 4.6 1,177 Selenium (µg/L)4.6 1.0 4.7 18.4 1.0 18.6 Silver (µg/L)20.6 0.5 20.8 Tributylin (µg/L)2 0.072 0.048 0.072 0.46 0.048 0.46 Zinc (µg/L)295 9.3 299 292 9.3 295 1: Based upon a Hardness of 294 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 (30 Day Average)Acute Standard (1 Hour Average) Parameter Standard Background1 Limit Standard Background1 Limit Aldrin (µg/L)1.5 1.0 1.5 Chlordane (µg/L)0.0043 0.0029 0.0043 1.2 0.0 1.2 DDT, DDE (µg/L)0.001 0.001 0.001 0.55 0.00 0.56 Diazinon (µg/L)0.17 0.11 0.17 0.17 0.11 0.17 Dieldrin (µg/L)0.0056 0.0038 0.0056 0.24 0.00 0.24 Endosulfan, a & b (µg/L)0.056 0.038 0.056 0.11 0.04 0.11 Endrin (µg/L)0.036 0.024 0.036 0.086 0.024 0.087 Heptachlor & H. epoxide (µg/L)0.0038 0.0025 0.0038 0.26 0.00 0.26 Lindane (µg/L)0.08 0.05 0.08 1.0 0.1 1.0 Methoxychlor (µg/L)0.03 0.02 0.03 Mirex (µg/L)0.001 0.001 0.001 Nonylphenol (µg/L)6.6 4.4 6.6 28.0 4.4 28.2 Parathion (µg/L)0.0130 0.0087 0.0131 0.066 0.009 0.067 PCB's (µg/L)0.014 0.009 0.014 Pentachlorophenol (µg/L)15.0 10.1 15.1 19.0 10.1 19.1 Toxephene (µg/L)0.0002 0.0001 0.0002 0.73 0.00 0.74 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 1,206 Boron (µg/L)75.0 99.8 74.6 Arsenic (µg/L)100 0.9 101 Cadmium (µg/L)10.0 6.7 10.0 Chromium (µg/L)100 1.9 101 Copper (µg/L)200 2.0 203 Lead (µg/L)100 0.7 101 Selenium (µg/L)50.0 1.0 50.7 Gross Alpha (pCi/L)1 15.0 10.1 15.1 1: Background concentration assumed 67% of chronic standard. Page B-3 Utah Division of Water Quality WASTELOAD ANALYSIS [WLA]Date:1/8/2024 Appendix: Total Residual Chlorine Discharging Facility:Swift Beef Co. UPDES No:UT-0000281 Mixing Zone:Fully mixed Travel Time:Compliance point @ receiving water: 15000 lineal feet flowing at 1 foot per second CHRONIC Decay Rate (/day) Season Receiving Water Standard Total Effluent Mixing Zone Boundary Effluent Limit Without Decay Temperature (°C) @ 20 deg C @ T deg C Travel Time (min) Decay Coefficient Effluent Limit Discharge (cfs)Summer 0.045 3.09 3.14 Fall 0.000 0.00 0.00 Winter 0.046 3.09 3.14 Spring 0.000 0.00 0.00 TRC (mg/L)Summer 0.000 0.011 0.011 31.6 20 34.1 250 0.00 4.183 Fall 0.000 0.011 0.0 20 8.0 250 0.25 Winter 0.000 0.011 0.011 32.3 20 35.2 250 0.00 5.021 Spring 0.000 0.011 0.0 20 8.0 250 0.25 ACUTE Decay Rate (/day) Season Receiving Water Standard Total Effluent Mixing Zone Boundary Effluent Limit Without Decay Temperature (°C)@ 20 °C @ T °C Travel Time (min) Decay Coefficient Effluent Limit Discharge (cfs)Summer 0.045 4.61 4.66 Fall 0.000 0.00 0.00 Winter 0.046 4.61 4.66 Spring 0.000 0.00 0.00 TRC (mg/L)Summer 0.000 0.019 0.019 31.6 20 34.1 250 0.00 7.190 Fall 0.000 0.019 0.0 20 8.0 250 0.25 Winter 0.000 0.019 0.019 32.3 20 35.2 250 0.00 8.631 Spring 0.000 0.019 0.0 20 8.0 250 0.25 Page C-1