Initial Study/Mitigated Negative Declaration (IS/MND)
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LOS ANGELES COUNTY DRAINAGE AREA SEPULVEDA DAM FLOOD CONTROL RESERVOIR DONALD C. TILLMAN WATER RECLAMATION PLANT EASEMENT IMPLEMENTATION Initial Study/Mitigated Negative Declaration (IS/MND) March 2019 Prepared By City of Los Angeles Department of Public Works, Bureau of Sanitation This page intentionally left blank. Donald C. Tillman Treatment Plant Lease Renewal Initial Study and Mitigated Negative Declaration CONTENTS 1 INTRODUCTION ........................................................................................................................... 1-1 PURPOSE OF INITIAL STUDY .......................................................................................................... 1-1 DOCUMENT FORMAT ..................................................................................................................... 1-1 CEQA PROCESS ............................................................................................................................ 1-1 2 PROJECT DESCRIPTION ............................................................................................................ 2-1 INTRODUCTION.............................................................................................................................. 2-1 LOCATION ..................................................................................................................................... 2-1 SETTING ........................................................................................................................................ 2-1 BACKGROUND ............................................................................................................................... 2-5 PURPOSE ........................................................................................................................................ 2-6 PROPOSED PROJECT ...................................................................................................................... 2-6 DIKE REHABILITATION .................................................................................................... 2-6 MULTI-PURPOSE BUILDING ............................................................................................. 2-6 CAPITAL IMPROVEMENT PROJECTS ................................................................................. 2-9 PILOT PROJECTS ............................................................................................................... 2-9 PROJECT CONSTRUCTION .............................................................................................................. 2-9 DIKE REHABILITATION. ................................................................................................... 2-9 MULTI-PURPOSE BUILDING ........................................................................................... 2-15 CAPITAL IMPROVEMENT PROJECTS ............................................................................... 2-15 OPERATIONS AND MAINTENANCE .............................................................................................. 2-15 PROJECT ACTIONS AND APPROVALS .......................................................................................... 2-16 3 ENVIRONMENTAL FACTORS POTENTIALLY AFFECTED ............................................... 3-1 DETERMINATION ..................................................................................................................... 3-1 4 EVALUATION OF ENVIRONMENTAL IMPACTS .................................................................. 4-1 AESTHETICS (AES) ....................................................................................................................... 4-3 ENVIRONMENTAL SETTING .............................................................................................. 4-3 REGULATORY SETTING .................................................................................................... 4-4 POTENTIAL IMPACTS ........................................................................................................ 4-4 MITIGATION ..................................................................................................................... 4-6 AGRICULTURE AND FOREST RESOURCES (AFR) .......................................................................... 4-7 ENVIRONMENTAL SETTING .............................................................................................. 4-7 REGULATORY SETTING .................................................................................................... 4-7 POTENTIAL IMPACTS ........................................................................................................ 4-7 MITIGATION ..................................................................................................................... 4-8 AIR QUALITY (AIR) ...................................................................................................................... 4-9 ENVIRONMENTAL SETTING .............................................................................................. 4-9 REGULATORY SETTING .................................................................................................. 4-10 POTENTIAL IMPACTS ...................................................................................................... 4-11 MITIGATION ................................................................................................................... 4-13 BIOLOGICAL RESOURCES (BIO).................................................................................................. 4-15 ENVIRONMENTAL SETTING ............................................................................................ 4-15 REGULATORY SETTING .................................................................................................. 4-17 POTENTIAL IMPACTS ...................................................................................................... 4-18 MITIGATION ................................................................................................................... 4-21 CULTURAL RESOURCES (CUL) ................................................................................................... 4-22 ENVIRONMENTAL SETTING ............................................................................................ 4-22 REGULATORY SETTING .................................................................................................. 4-26 POTENTIAL IMPACTS ...................................................................................................... 4-30 City of Los Angeles Sanitation i 2019 Department of Public Works Donald C. Tillman Treatment Plant Lease Renewal Initial Study and Mitigated Negative Declaration MITIGATION ................................................................................................................... 4-31 GEOLOGY AND SOILS (GEO) ...................................................................................................... 4-33 ENVIRONMENTAL SETTING ............................................................................................ 4-33 REGULATORY SETTING .................................................................................................. 4-34 POTENTIAL IMPACTS ...................................................................................................... 4-34 MITIGATION ................................................................................................................... 4-37 GREENHOUSE GAS EMISSIONS (GHG) ........................................................................................ 4-39 ENVIRONMENTAL SETTING ............................................................................................ 4-39 REGULATORY SETTING .................................................................................................. 4-39 POTENTIAL IMPACTS ...................................................................................................... 4-40 MITIGATION ................................................................................................................... 4-41 HAZARDOUS MATERIALS (HAZ) ................................................................................................ 4-42 ENVIRONMENTAL SETTING ............................................................................................ 4-42 REGULATORY SETTING .................................................................................................. 4-45 POTENTIAL IMPACTS ...................................................................................................... 4-47 MITIGATION ................................................................................................................... 4-49 HYDROLOGY AND WATER QUALITY (WAT) .............................................................................. 4-51 ENVIRONMENTAL SETTING ............................................................................................ 4-52 REGULATORY SETTING .................................................................................................. 4-53 POTENTIAL IMPACTS ...................................................................................................... 4-56 MITIGATION ................................................................................................................... 4-60 LAND USE AND LAND USE PLANNING (USE) ............................................................................. 4-62 ENVIRONMENTAL SETTING ...........................................................................................