SLC LL Report Contributory Flow Limits 10-30-2013

1 MEMORANDUM DEPARTMENT of PUBLIC UTILITIES ENGINEERING DIVISION SALT LAKE CITY DEPARTMENT of PUBLIC UTILITIES 1530 SOUTH WEST TEMPLE STREET SALT LAKE CITY, UTAH 84115 TEL 801-483-6770 TO: Dale A. Christensen, Water Reclamation Manager Tom Ward, Public Utilities Deputy Director FROM: David Koltz, Regulatory Compliance Engineer DATE: April 7, 2015 RE: Salt Lake City Corporation Local Limits Evaluation ---------------------------------------- ---------------------------------------- ---------------------------------------- ----------- Salt Lake City Public Utilities has completed an evaluation of its existing Local Limits .

2 Technically-based Local Limits are established to protect the Water Reclamation Facility (WRF) from industrial discharges that may cause pass-through, interference, or diminish the use of wastewater residuals. The Local Limits Evaluation includes a detailed review of the WRF s operational characteristics; determination of industrial and WRF flows, and pollutants of concern; field sampling and collection of data; calculation of allowable WRF pollutant loading; and designation and implementation of Local Limits . As of April 2015, the Local Limits proposed in the attached Report are going through the public review, input, comment, and approval process.

3 Prior to implementation, Local Limits must go through a process including Salt Lake City Council endorsement, Utah Department of Environmental Quality (UDEQ) public advertisement/approval, and, ultimately, Salt Lake City Council approval for adoption. As of today s date, Salt Lake City Public Utilities is working closely with Council members to address questions pertaining to the evaluation. Following Salt Lake City Council endorsement, the Local Limits Evaluation will be submitted to UDEQ for formal public advertisement. Following the public review/comment period and UDEQ formal approval, Salt Lake City Public Utilities will obtain Salt Lake City Council s formal approval to adopt the revised Local Limits .

4 SALT LAKE CITY CORPORATION LOCAL Limits EVALUATION DECEMBER 28, 2010 REVISED FEBRUARY 19, 2012 APRIL 18, 2013 october 30, 2013 Prepared By: Pretreatment Solutions, Inc. 665 Palm Place Safety Harbor, FL 34695 TABLE OF CONTENTS Contents EXECUTIVE SUMMARY .. 1 INTRODUCTION .. 3 FACILITY .. 5 Plant Schematic .. 5 Process Description .. 7 Surface Water Discharge .. 7 Enhanced Wetlands Discharge Outfall 001 .. 7 Oil Drain Canal Discharge Outfall 003 .. 8 Receiving Waters and Stream Classification .. 9 Class 3E Surface Water.

5 9 DETERMINATION OF WRF AND INDUSTRIAL USER FLOWS .. 10 Wastewater Reclamation Facility: .. 10 Average Daily Flows .. 10 POLLUTANTS OF CONCERN (POC) .. 13 Plan of Study Pollutants of Concern .. 13 Hardness Based Limits for Select Metals .. 13 Results of Sampling Summary .. 14 Pollutants Identified for Evaluation .. 28 PLANT MONITORING DATA .. 29 Sampling and Analysis for POCs: .. 29 Certified Laboratory .. 29 Comments on Sampling Event .. 29 Results .. 32 WRF Influent and Effluent .. 32 Residential and Commercial Sources.

6 35 CALCULATION OF THE WRF REMOVAL EFFICIENCIES .. 38 Average Daily Removal Efficiency (ADRE) .. 38 Mean Removal Efficiency (MRE) .. 38 Decile Method .. 41 Residuals and Influent Data MRE .. 53 Residuals and Effluent Data MRE .. 55 Selection of a Representative Removal Efficiency for each POC.. 57 Negative Removal Efficiencies .. 57 EPA Literature Selection .. 57 LOCAL LIMIT CALCULATIONS .. 59 WRF Flow Data .. 60 General Information .. 60 POCs Removed From Local Limit Calculation .. 64 Conventional Pollutants .. 64 Other Pollutants for Removal.

7 65 Final List of Pollutants for Local Limit Calculation .. 66 EPA Local Limits Guidance Calculations .. 68 Calculation of Maximum Allowable Headworks Loading (MAHLs) .. 68 Parameter Specific Flows for BOD and TSS .. 76 Calculation of Local Limits .. 76 Local Limits Calculations Using EPA Region 8 Strategy (4-11-03) .. 79 Utah Division of Water Quality Pretreatment Program Spreadsheet .. 102 Comparison of Calculated Uniform Local Limits .. 105 Selection and Removal of Calculated and Existing Limits .. 107 RECOMMENDED TECHNICALLY BASED LOCAL Limits .

8 109 Uniform Concentration Local Limits .. 109 Review of IUs Impacted by Proposed Uniform Concentration Local Limits 109 Impact of Recommended BOD and TSS Limits .. 110 AIL Allocation Methods .. 113 Appendices Appendix 1: Flow Data Used in Local Limits Evaluation Appendix 2: Laboratory Analytical Results Used in Evaluation and Data Validation Appendix 3: Laboratory Reports List of Tables Table 1 Salt Lake City Proposed Local Limits Table 2 Flows Used in Local Limit Study Table 3 Plan of Study POCs Table 4 Hardness Based Metals Limits Table 5 Influent Analytical Methods/MDL/RL/WRF Limits /Review Table 6 Effluent Analytical Methods/MDL/RL/WRF Limits /Review Table 7 Parameters Identified as POCs or with Positive Influent or Effluent Results Table 8 Parameters for Evaluation Table 9 Sample Collection Dates and Pairing Table 10 Influent Results Table 11

9 Effluent Results Table 12 Uncontrollable Residential Results - 1805 Independence Table 13 Uncontrollable Commercial Results - 450 S. 300 E. Table 14 Influent and Effluent Averages ADRE, and MRE Calculations Table 15 Calculated Daily Decimal Removal Efficiencies Table 16 Sorted Daily Removal Efficiencies (Influent to Effluent) Table 17 Calculated Deciles Table 18 Calculated Decile Summary Table 19 Calculated Removal Efficiency Percentages - Residuals and Influent Table 20 Calculated Removal Efficiency Percentages - Residuals and Effluent Table 21 Removal Efficiencies Comparison and Selection Table 22 Selected % Removal Efficiency Summary Table 23 Local Limits Information Summary Table 24 Pollutant Loading Table 25 Final List of POCs for MAHL Calculation Table 26 Influent Based

10 MAHLs Table 27 Effluent Based MAHLs Table 28 Residuals Based MAHLs Table 29 MAHL Summary Table 30 Local Limit Calculations Table 31 R8 - General Data Entry Table 32 R8 Daily Criteria And Standards Table 33 R8 - Monthly Criteria And Standards Table 34 R8 - Influent And Effluent Data Table 35 R8 - Pollutant Loading And Receiving Water Table 36 R8 - Biosolids Table 37 R8 - Removal Efficiency Calculations Table 38 R8 - Daily MAHL Calculations Table 39 R8 - Monthly MAHL Calculations Table 40 R8 - Daily Local Limits Table 41 Utah DWQ- Worksheet For Calculation Of MAHL Table 42 Utah DWQ- Allocation Of Maximum Allowable Industrial Load (MAIL)