Lake Powell Pipeline Modified Draft Study Report 1 Air Quality January 2012 Lake Powell Pipeline 1/27/12 Modified Draft Air Quality Study Report Utah Board of Water Resources This Page Intentionally Left Blank Lake Powell Pipeline 1/27/12 Modified Draft Air Quality Study Report Utah Board of Water Resources Modified Draft Air Quality Study Report Table of Contents Page Executive Summary ........................................................................................................................ ES-1 ES-1 Introduction .................................................................................................................. ES-1 ES-2 Methodology ................................................................................................................ ES-1 ES-3 Key Results of the Air Quality Impact Analysis.......................................................... ES-1 ES-3.1 Water Conveyance System / Cedar Valley Pipeline System .......................... ES-1 ES-3.2 Hydro System – Existing Highway Alternative .............................................. ES-1 ES-3.3 Hydro System – South Alternative / Southeast Corner Alternative ................ ES-2 ES-3.4 Transmission Line Alternatives ...................................................................... ES-2 ES-3.5 Natural Gas Supply Line and Generators Alternative .................................... ES-2 ES-3.6 Indirect Effects from LPP Project from Population Growth ........................... ES-2 ES-3.7 No Lake Powell Water Alternative ................................................................. ES-2 ES-3.8 No Action Alternative ..................................................................................... ES-3 ES-3.9 Air Quality Impacts Resulting from Additional Power Demand .................... ES-3 Chapter 1 Introduction .................................................................................................................. 1-1 1.1 Introduction .................................................................................................................... 1-1 1.2 Summary Description of Alignment Alternatives ......................................................... 1-1 1.2.1 South Alternative .............................................................................................. 1-1 1.2.2 Existing Highway Alternative .......................................................................... 1-8 1.2.3 Southeast Corner Alternative ............................................................................ 1-8 1.2.4 Transmission Line Alternatives ...................................................................... 1-10 1.2.5 Natural Gas Supply Line and Generators Alternative .................................... 1-17 1.2.5.1 Natural Gas Transmission Line Connection ................................... 1-17 1.2.5.2 Natural Gas Supply Line ................................................................ 1-17 1.2.5.3 Natural Gas Generators .................................................................. 1-20 1.3 Summary Description of No Lake Powell Water Alternative ..................................... 1-22 1.3.1 WCWCD No Lake Powell Water Alternative ................................................ 1-23 1.3.2 CICWCD No Lake Powell Water Alternative ................................................ 1-23 1.3.3 KCWCD No Lake Powell Water Alternative ................................................. 1-24 1.4 Summary Description of the No Action Alternative ................................................... 1-24 1.4.1 WCWCD No Action Alternative .................................................................... 1-24 1.4.2 CICWCD No Action Alternative .................................................................... 1-25 1.4.3 KCWCD No Action Alternative ..................................................................... 1-25 1.5 Identified Issues ........................................................................................................... 1-25 1.5.1 Purposes of Study ........................................................................................... 1-25 1.5.2 Identified Issues .............................................................................................. 1-26 1.6 Impact Topics .............................................................................................................. 1-26 Chapter 2 Methodology ................................................................................................................. 2-1 2.1 General ........................................................................................................................... 2-1 2.2 Data Used ....................................................................................................................... 2-1 2.2.1 Agency Resource Management Goals .............................................................. 2-2 Lake Powell Pipeline i 1/27/12 Modified Draft Air Quality Study Report Utah Board of Water Resources 2.2.1.1 UDEQ – Division of Air Quality ...................................................... 2-2 2.2.1.2 ADEQ – Air Quality Division .......................................................... 2-2 2.2.1.3 EPA .................................................................................................. 2-2 2.2.1.4 Kaibab Band of Paiute Indians ......................................................... 2-3 2.2.1.5 Bureau of Land Management (BLM) ............................................... 2-3 2.2.1.6 National Park Service ....................................................................... 2-3 2.2.1.7 Bureau of Reclamation ..................................................................... 2-3 2.2.1.8 Southern Utah Air Quality Task Force ............................................. 2-3 2.2.1.9 Five County Association, Counties, and Local Agencies Information ....................................................................................... 2-3 2.3 Assumptions................................................................................................................... 2-4 2.3.1 Impact Corridor................................................................................................. 2-5 2.4 Impact Analysis Methodology ....................................................................................... 2-5 2.4.1 Review Existing Information ............................................................................ 2-6 2.4.2 Field Investigations ........................................................................................... 2-6 2.4.3 Perceived Aesthetic Valuable Areas ................................................................. 2-6 2.4.4 Equipment Estimates and Emissions ................................................................ 2-6 2.4.4.1 Particulate Matter (PM) Calculations ............................................... 2-8 2.4.5 Review Air Quality Dispersion Models ............................................................ 2-8 2.4.6 Construction Air Quality Calculations .............................................................. 2-9 2.4.6.1 Particulate Matter (PM10) ................................................................. 2-9 2.4.6.2 Nitrogen Dioxide (NO2) ................................................................... 2-9 2.4.6.3 Carbon Monoxide (CO) .................................................................... 2-9 2.4.6.4 Other Pollutants .............................................................................. 2-10 2.4.7 Operations Air Quality Calculations ............................................................... 2-10 Chapter 3 Affected Environment (Baseline Conditions) ............................................................ 3-1 3.1 Impact Area .................................................................................................................... 3-1 3.2 Overview of Baseline Conditions .................................................................................. 3-1 3.2.1 Baseline Conditions .......................................................................................... 3-1 3.2.1.1 Dense Population Areas ................................................................... 3-1 3.2.1.2 Historical Air Quality (Baseline) ...................................................... 3-1 3.2.1.3 Meteorological Characteristics ......................................................... 3-3 3.3 Overview of LPP Project Conditions ............................................................................. 3-4 3.3.1 Air Pollutants of Concern ................................................................................. 3-4 3.3.1.1 Fugitive Dust and Particulate Matter ................................................ 3-4 3.3.1.2 Nitrogen Dioxide (NO2) ................................................................. 3-11 3.3.1.3 Carbon Monoxide (CO) .................................................................. 3-12 3.3.1.4 Sulfur Dioxide (SO2) and Other Pollutants .................................... 3-12 3.3.2 Nonattainment Areas ...................................................................................... 3-12 3.3.3 Operations Air Quality Calculations ............................................................... 3-12 3.3.4 Construction of Pipelines and Facilities ......................................................... 3-23 3.3.5 Construction of Transmission Lines ............................................................... 3-23