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Potable and Recycled Pipeline Replacements at Interstate 5 and Oso Creek Project Draft Initial Study/ Mitigated Negative Declaration

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Potable and Recycled Pipeline Replacements at Interstate 5 and Oso Creek Project Draft Initial Study/ Mitigated Negative Declaration Potable and Recycled Pipeline Replacements at Interstate 5 and Oso Creek Project Draft Initial Study/ Mitigated Negative Declaration March 14, 2018 | GHD-04 Prepared for: Moulton Niguel Water District 26161 Gordon Road Laguna Hills, CA 92653 Prepared by: HELIX Environmental Planning, Inc. 16485 Laguna Canyon Road Suite 150 Irvine, CA 92618 Potable and Recycled Pipeline Replacements at Interstate 5 and Oso Creek Project Draft Initial Study/Mitigated Negative Declaration Prepared for: Moulton Niguel Water District 26161 Gordon Road Laguna Hills, CA 92653 Prepared by: HELIX Environmental Planning, Inc. 16485 Laguna Canyon Road Suite 150 Irvine, CA 92618 March 14, 2018 | GHD-04 Potable and Recycled Pipeline Replacements at Interstate 5 and Oso Creek Project TABLE OF CONTENTS Section Page SUMMARY OF FINDINGS ................................................................................................................... iii 1.0 INTRODUCTION ........................................................................................................................1 1.1 INITIAL STUDY INFORMATION SHEET ........................................................................................ 1 1.2 ENVIRONMENTAL FACTORS POTENTIALLY AFFECTED .............................................................. 5 1.3 DETERMINATION ....................................................................................................................... 6 1.4 EVALUATION OF ENVIRONMENTAL IMPACTS ........................................................................... 7 2.0 ENVIRONMENTAL INITIAL STUDY CHECKLIST .............................................................................9 I. AESTHETICS................................................................................................................................ 9 II. AGRICULTURE AND FORESTRY RESOURCES ............................................................................ 10 III. AIR QUALITY ............................................................................................................................ 11 IV. BIOLOGICAL RESOURCES ......................................................................................................... 13 V. CULTURAL RESOURCES ............................................................................................................ 21 VI. GEOLOGY AND SOILS ............................................................................................................... 24 VII. GREENHOUSE GAS EMISSIONS ................................................................................................ 26 VIII. HAZARDS AND HAZARDOUS MATERIALS ................................................................................ 28 IX. HYDROLOGY AND WATER QUALITY ........................................................................................ 30 X. LAND USE AND PLANNING ...................................................................................................... 33 XI. MINERAL RESOURCES .............................................................................................................. 34 XII. NOISE ....................................................................................................................................... 35 XIII. POPULATION AND HOUSING ................................................................................................... 38 XIV. PUBLIC SERVICES ..................................................................................................................... 39 XV. RECREATION ............................................................................................................................ 40 XVI. TRANSPORTATION AND TRAFFIC ............................................................................................ 41 XVII. TRIBAL CULTURAL RESOURCES ................................................................................................ 43 XVIII. UTILITIES AND SERVICE SYSTEMS ............................................................................................ 44 XIX. MANDATORY FINDINGS OF SIGNIFICANCE ............................................................................. 46 3.0 REFERENCES ........................................................................................................................... 48 i Potable and Recycled Pipeline Replacements at Interstate 5 and Oso Creek Project TABLE OF CONTENTS (cont.) LIST OF APPENDICES A Biological Technical Report B Cultural Resources Survey C Mitigation Monitoring and Reporting Program LIST OF FIGURES No. Title Follows Page 1 Regional Location ............................................................................................................................. 2 2 Aerial Vicinity ................................................................................................................................... 2 3 Proposed Project .............................................................................................................................. 2 ii Potable and Recycled Pipeline Replacements at Interstate 5 and Oso Creek Project SUMMARY OF FINDINGS Name or Description of Project: Potable and Recycled Pipeline Replacements at Interstate 5 and Oso Creek Project Project Location: The project area is generally located at Interstate 5 (I-5), approximately 0.30 mile to the south of Oso Parkway and one mile north of Crown Valley Parkway in the City of Mission Viejo, Orange County, California. The project area straddles I-5, with Mission Viejo Country Club in the eastern portions and Moulton Niguel Water District’s (MNWD’s) Wastewater Plant 3A in the western portions. Lead Agency Name: Moulton Niguel Water District MNWD’s Potable and Recycled Pipeline Replacements at Interstate 5 and Oso Creek Project (project) is proposing replacement of existing potable water (PW) and recycled water (RW) pipelines that run underneath the I-5 freeway using trenchless microtunneling installation methods. The PW and RW pipelines transport water to and from existing pump stations located on each side of the freeway. FINDINGS MNWD, the Lead Agency, having reviewed the Initial Study of this proposed project, does hereby find and declare that the proposed project will not have a significant effect on the environment with implementation of mitigation measures. A brief statement of the reasons supporting the Lead Agency’s findings are as follows: MNWD finds that the project WILL NOT have a significant effect on the environment for the following reasons: 1. The proposed project may potentially result in significant impacts from construction activities to least Bell’s vireo and southwestern willow flycatcher; however, implementation of mitigation measure BIO-1 would reduce associated impacts to below a level of significance. 2. The proposed project may potentially result in significant impacts from construction activities to pallid bat and western red bat; however, implementation of mitigation measure BIO-2 would reduce associated impacts to below a level of significance. 3. The proposed project may potentially result in significant indirect noise impacts from construction activities to nesting birds; however, implementation of mitigation measure BIO-3 would reduce associated impacts to below a level of significance 4. The proposed project may potentially result in significant impacts from construction activities to southern western pond turtle and two-striped garter snake; however, implementation of mitigation measure BIO-4 would reduce associated impacts to below a level of significance. 5. The proposed project may potentially result in significant impacts to unknown buried cultural and tribal cultural resources; however, implementation of mitigation measure CUL-1 would reduce associated impacts to below a level of significance. iii Potable and Recycled Pipeline Replacements at Interstate 5 and Oso Creek Project In addition, the proposed project would not result in significant impacts to aesthetics, agricultural and forestry resources, air quality, geology and soils, greenhouse gas emissions, hazards and hazardous materials, hydrology and water quality, land use and planning, mineral resources, noise, population and housing, public services, recreation, transportation and traffic, or utilities and service systems. MITIGATION MEASURES Implementation of the project-specific mitigation measures identified below would reduce potentially significant impacts to below a level of significance. BIO-1 Least Bell’s Vireo and Southwestern Willow Flycatcher. Due to presence of suitable habitat for least Bell’s vireo and southwestern willow flycatcher adjacent to the proposed work areas, the following avoidance and minimization measures shall be implemented to avoid potential indirect impacts to these two species: 1. Construction activities (i.e., earthwork, clearing, and grubbing) shall occur outside of the breeding season for least Bell’s vireo (March 15 through August 31) and southwestern willow flycatcher (May 1 through August 31) to the extent feasible. 2. If construction activities (i.e., earthwork, clearing, grubbing, etc.) are proposed within the breeding season of least Bell’s vireo and/or southwestern willow flycatcher, focused protocol surveys for least Bell’s vireo and southwestern willow flycatcher shall be conducted prior to commencement of construction activities, within all suitable habitat located on the study area, along with a 500-foot buffer where suitable habitat occurs, to determine whether the
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