Revised Section 4.6 Biological Resources Draft Environmental

Revised Section 4.6 Biological Resources Draft Environmental Impact Report SCH No. 2002091081 Prepared for: City of Santa Clarita Department of Planning & Building Services 23920 Valencia Boulevard, Suite 302 Santa Clarita, California 91355 Prepared by: Impact Sciences, Inc. 30343 Canwood Street, Suite 210 Agoura Hills, California 91301 <ul style="display: flex;"><li style="flex:1">M a r c h </li><li style="flex:1">2 0 0 4 </li></ul>Revised Section 4.6 Biological Resources Draft Environmental Impact Report SCH No. 2002091081 Prepared for: City of Santa Clarita Department of Planning & Building Services 23920 Valencia Boulevard, Suite 302 Santa Clarita, California 91355 Prepared by: Impact Sciences, Inc. 30343 Canwood Street, Suite 210 Agoura Hills, California 91301 <ul style="display: flex;"><li style="flex:1">M a r c h </li><li style="flex:1">2 0 0 4 </li></ul>Table of Contents Volume I: Environmental Impact Report <ul style="display: flex;"><li style="flex:1">Section </li><li style="flex:1">Page </li></ul>Introduction.................................................................................................................... I-1 Executive Summary ......................................................................................................ES-1 Project Description....................................................................................................... 1.0-1 Environmental and Regulatory Setting......................................................................... 2.0-1 Cumulative Impact Analysis Methodology .................................................................. 3.0-1 1.0 2.0 3.0 <ul style="display: flex;"><li style="flex:1">4.0 </li><li style="flex:1">Environmental Impact Analyses................................................................................... 4.0-1 </li></ul>Geotechnical Hazards........................................................................................... 4.1-1 Flood .................................................................................................................... 4.2-1 Traffic/Access....................................................................................................... 4.3-1 Air Quality........................................................................................................... 4.4-1 Noise.................................................................................................................... 4.5-1 Biological Resources.............................................................................................. 4.6-1 Land Use............................................................................................................... 4.7-1 Water Services...................................................................................................... 4.8-1 4.8.1 Water Quality..............................................................................................4.8.1-1 Solid Waste Disposal............................................................................................ 4.9-1 Education.............................................................................................................4.10-1 Library Services...................................................................................................4.11-1 Parks and Recreation............................................................................................4.12-1 Fire Services ........................................................................................................4.13-1 Sheriff Services ...................................................................................................4.14-1 Human Made Hazards..........................................................................................4.15-1 Visual Resources...................................................................................................4.16-1 Population/Housing/Employment.........................................................................4.17-1 Cultural Resources................................................................................................4.18-1 Agricultural Resources..........................................................................................4.19-1 Floodplain Modifications.....................................................................................4.20-1 Wastewater Disposal...........................................................................................4.21-1 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10 4.11 4.12 4.13 4.14 4.15 4.16 4.17 4.18 4.19 4.20 4.21 5.0 6.0 7.0 8.0 Unavoidable Significant Impacts................................................................................. 5.0-1 Project Alternatives..................................................................................................... 6.0-1 Growth-Inducing Impacts............................................................................................. 7.0-1 Any Significant Irreversible Environmental Changes Which Would be Involved in the Proposed Actions Should They be Implemented .............................. 8.0-1 9.0 10.0 11.0 Effects Not Found to Be Significant .............................................................................. 9.0-1 Organizations/Persons Consulted................................................................................10.0-1 References..................................................................................................................11.0-1 Please note that the shaded items are not included in this document. Impact Sciences, Inc. 112-16 iRiverpark Revised DEIR March 2004 Table of Contents (continued) Volumes II through IV: Appendices <ul style="display: flex;"><li style="flex:1">Appendix I </li><li style="flex:1">–</li><li style="flex:1">Notice of Preparation and Initial Study; </li></ul>Responses to Notice of Preparation Appendix 1.0 Appendix 3.0 Appendix 4.1 Appendix 4.2 Appendix 4.3 Appendix 4.4 Appendix 4.5 Appendix 4.6 –––––––– Resolution Development Monitoring System Database Geotechnical Report(s) Flood Traffic and Circulation Report Air Quality Data Noise Data Biological Data and Reports (This is not included in its entirety. Soley the new information has been included.) Appendix 4.8 Appendix 4.9 –– Water Service Data Solid Waste Disposal Data Appendix 4.10 – Student Generation Calculations Appendix 4.11 – Libraries Data and Correspondence Appendix 4.13 – Fire Data and Correspondence Appendix 4.14 – Sheriff’s Data and Correspondence Appendix 4.15 – Phase I Site Assessment Appendix 4.18 – Cultural Resources Report Appendix 4.19 – Agricultural Resources Storie Index Appendix 4.20 – Floodplain Modifications Appendix 4.21 – Wastewater Data <ul style="display: flex;"><li style="flex:1">Appendix 6.0 </li><li style="flex:1">–</li><li style="flex:1">Alternatives Data </li></ul>Impact Sciences, Inc. 112-16 ii Riverpark Revised DEIR March 2004 List of Figures <ul style="display: flex;"><li style="flex:1">Figure </li><li style="flex:1">Page </li></ul>1.0-1 1.0-2 1.0-3 1.0-4 1.0-5 1.0-6 1.0-7 1.0-8 1.0-9 1.0-10 1.0-11 1.0-12 1.0-13 1.0-14 2.0-1 2.0-2 2.0-3 2.0-4 2.0-5 2.0-6 2.0-7 2.0-8 3.0-1 4.1-1 4.1-2 4.2-1 4.2-2 4.2-3 4.2-4 4.2-5 4.2-6 4.2-7 4.2-8 4.2-9 4.2-10 4.3-1 4.3-2 4.3-3 4.3-4 4.3-5 4.3-6 4.3-7 4.3-8 4.3-9 4.3-10 4.3-11 4.3-12 4.3-13 Regional Location........................................................................................................ 1.0-5 Project Vicinity ........................................................................................................... 1.0-6 Surrounding Land Uses................................................................................................. 1.0-7 Area A1 Single Family Residential Detail..................................................................1.0-20 Area A2 Single Family Residential Detail..................................................................1.0-21 Area B Single Family Residential Detail ...................................................................1.0-22 Area C Multi-Family Residential Detail....................................................................1.0-23 Area D Multi-Family Residential Detail ...................................................................1.0-24 Area E Commercial Detail..........................................................................................1.0-25 Vesting Tentative Tract Map ...................................................(Map Box, Map #s 1–5) 1.0-26 Analyzed Roadway Improvements on Major Thoroughfares .........................................1.0-32 Bank Stabilization.....................................................................................................1.0-35 Examples of Bank Stabilization Techniques ................................................................1.0-36 Potential Water Tank Locations..................................................................................1.0-37 Surrounding Land Uses................................................................................................. 2.0-7 City of Santa Clarita Significant Ecological Area (SEA).............................................. 2.0-8 Disturbed Areas of the Site.......................................................................................... 2.0-9 Site Characteristics ...................................................................................................2.0-12 Slope Analysis for TTM 53425 ...................................................... (Map Box, Map # 6) 2.0-13 Approximate Oak Tree Locations................................................................................2.0-15 Major On-Site Encumbrances........................................................................................2.0-18 City of Santa Clarita General Plan Land Use Designations..........................................2.0-19 Cumulative Impact Analysis Methodology .................................................................. 3.0-9 Geologic/Geotechnical Map.....................................................(Map Box, Map #s 7–10) 4.1-3 Regional Fault Locations ............................................................................................4.1-13 Drainage Locations........................................................................................................4.21 Santa Clara River Existing Conditions 2-Year Flood Event ..........................................4.2-24 Santa Clara River Existing Conditions 5-Year Flood Event ..........................................4.2-25 Santa Clara River Existing Conditions 10-Year Flood Event.........................................4.2-26 Santa Clara River Existing Conditions 20-Year Flood Event.........................................4.2-27 Santa Clara River Existing Conditions 50-Year Flood Event.........................................4.2-28 Santa Clara River Existing Conditions 100-Year Flood Event.......................................4.2-29 Santa Clara River Existing Conditions 50-Year Capital Flood Event............................4.2-30 Drainage Concept Map ........................................................ (Map Box, Map #s 11–15) 4.2-31 Riverpark Bank Lining...............................................................................................4.2-35 Project Study Area....................................................................................................... 4.3-5 Existing Roadway Network........................................................................................4.3-12 Existing Average Daily Traffic...................................................................................4.3-13 AM Peak Hour Turning Movement Volumes – Existing Conditions .................................4.3-14 PM Peak Hour Turning Movement Volumes – Existing Conditions..................................4.3-15 Future Transportation System – Interim Year and Long-Range ......................................4.3-20 Average Daily Traffic Volumes – Project Residential Trips Only .................................4.3-27 Average Daily Traffic Volumes – Project Commercial Trips Only.................................4.3-30 Average Daily Traffic Volumes – Interim Year without Project....................................4.3-35 Average Daily Traffic Volumes – Interim Year with Project.........................................4.3-36 Average Daily Traffic Volumes – Alternative Interim Year without Project.................4.3-41 Average Daily Traffic Volumes – Alternative Interim Year with Project......................4.3-44 Average Daily Traffic Volumes – Santa Clarita Valley Buildout without Project ........4.3-59 Impact Sciences, Inc. 112-16 iii Riverpark Revised DEIR March 2004 List of Figures (continued) Figure 4.3-14 4.3-15 4.3-16 Page Average Daily Traffic Volumes – Santa Clarita Valley Buildout Scenario without Project and without Santa Clarita Parkway.............................................4.3-60 Average Daily Traffic Volumes – Santa Clarita Valley Buildout Scenario with Project..........................................................................................................4.3-63 Average Daily Traffic Volumes – Santa Clarita Valley Buildout Scenario with Project and without Santa Clarita Parkway..................................................4.3-64 South Coast Air Basin ................................................................................................. 4.4-3 Dominant Wind Patterns in the Basin .........................................................................4.4-43 Noise Attenuation by Barriers ..................................................................................... 4.5-5 Noise and Land Use Compatibility Guidelines............................................................4.5-12 Noise Levels of Typical Construction Equipment..........................................................4.5-21 Proposed Sound Walls ................................................................................................4.5-24 Regional Location........................................................................................................ 4.6-7 Project Vicinity ........................................................................................................... 4.6-8 VTTM 52325 (Please see the electronic version of this file on the CD, and it is also 4.4-1 4.4-2 4.5-1 4.5-2 4.5-3 4.5-4 4.6-1 4.6-2 4.6-3 located in the Map Box, Map # 16) ........................................................................4.6-11 Drainage Locations.....................................................................................................4.6-43 Wildlife Movement Corridors.....................................................................................4.6-46 City of Santa Clarita Ecological Area (SEA)...............................................................4.6-49 Riverpark Bank Lining...............................................................................................4.6-82 Existing General Plan Land Use.................................................................................... 4.7-5 Surrounding Land Uses................................................................................................4.7-10 Proposed General Plan Land Use .................................................................................4.7-13 Existing Zoning......................................................................................................... 4.7-125 Proposed Zoning ....................................................................................................... 4.7-126 Existing Water Reclamation Plants and Sanitation Districts ........................................ 4.8-3 Rainfall in the Santa Clarita Valley .......................................................................... 4.8-4 Historical and Projected Number of Service Connections................................................ 4.8-4 Location of the Alluvial and Saugus Formation ............................................................ 4.8-6 Geological and Hydrologic Cycle – Santa Clarita Valley............................................. 4.8-9 Groundwater Basins in the Santa Clara River Drainage ..............................................4.8-10 Groundwater Production Well Locations – Santa Clarita Valley..................................4.8-11 Castaic Lake Water Agency Service Area ...................................................................4.8-18 Castaic Lake Water Agency Water Delivery System...................................................4.8-21 Valencia Water Company Service Area......................................................................4.8-24 Groundwater Basins in the Santa Clarita River Drainage............................................4.8-25 Existing Water Reclamation Plants and Sanitation Districts .......................................4.8-30 Typical Well Configuration........................................................................................4.8-34 Historical Groundwater Production – Alluvial Aquifer................................................4.8-36 Cross Section of the Groundwater Basin.......................................................................4.8-39 Historical Groundwater Production from the Saugus Formation from 1947 to 2002..........4.8-41 Active and Inactive Groundwater Well Locations – Santa Clarita Valley....................4.8-45 Principal State Water Program Facilities...................................................................4.8-68 State Water Program Contractor Service Areas ...........................................................4.8-69 Projected State Water Deliveries................................................................................4.8-74 Historical and Projected Number of Service Locations..................................................4.8-98 Proposed On-Site Potable Water System................................................................... 4.8-101 Surrounding Site Conditions..................................................................................... 4.8.1-15 Drainage Concept Map ............................................................................................ 4.8.1-32 4.6-4 4.6-5 4.6-6 4.6-7 4.7-1 4.7-2 4.7-3 4.7-4 4.7-5 4.8-1 4.8-2 4.8-3 4.8-4 4.8-5 4.8-6 4.8-7 4.8-8 4.8-9 4.8-10 4.8-11 4.8-12 4.8-13 4.8-14 4.8-15 4.8-16 4.8-17 4.8-18 4.8-19 4.8-20 4.8-21 4.8-22 4.8.1-1 4.8.1-2 Impact Sciences, Inc. 112-16 iv Riverpark Revised DEIR March 2004 List of Figures (continued) <ul style="display: flex;"><li style="flex:1">Figure </li><li style="flex:1">Page </li></ul><ul style="display: flex;"><li style="flex:1">4.9-1 </li><li style="flex:1">Locations of Major Los Angeles County Landfill Sites...................................................4.9-11 </li></ul>Library Locations .......................................................................................................4.11-3 Existing and Proposed City of Santa Clarita Parks ......................................................4.12-5 County and State Park Facilities ................................................................................4.12-6 City of Santa Clarita Trails ..................................................................................... 4.12-13 Recreation and Trails Plan........................................................................................ 4.12-18 Active/Passive Park ................................................................................................ 4.12-19 Proposed Trails in Relation to the City of Santa Clarita SEA Boundaries................... 4.12-22 Typical Trail Sections .............................................................................................. 4.12-23 Bicycle Trail Rights-of-Way.................................................................................... 4.12-24 Fire Station Locations.................................................................................................4.13-3 Sheriff Station Location.............................................................................................4.14-3 Oil Well Locations.....................................................................................................4.15-7 4.11-1 4.12-1 4.12-2 4.12-3 4.12-4 4.12-5 4.12-6 4.12-7 4.12-8 4.13-1 4.14-1 4.15-1 4.16-1A Disturbed Areas of the Site.........................................................................................4.16-5 4.16-1B 4.16-2 4.16-3 4.16-4 4.16-5 Viewing Locations......................................................................................................4.16-8 Viewing Location No. 1 – Looking Northwest into the Project Site................................4.16-9 Viewing Location No. 2 – Looking Northeast into the Project Site............................... 4.16-10 Viewing Location No. 3 – From Soledad Canyon Road Looking Northeast................... 4.16-13 Viewing Location No. 4 – From Soledad Canyon Road Looking Northeast into the Project Site ............................................................................................ 4.16-14 <ul style="display: flex;"><li style="flex:1">Viewing Location No. 5 – Junction of Soledad Canyon and the Terminus of </li><li style="flex:1">4.16-6 </li></ul>Newhall Ranch Road......................................................................................... 4.16-15 Viewing Location No. 6 – Looking South into the Project Site from the Emblem Tract... 4.16-18 Typical Building Elevations – Planning Area C-Upper Pad........................................ 4.16-23 Typical Building Elevations – Planning Area C-Lower Pad........................................ 4.16-24 Typical Building Elevations – Planning Area D......................................................... 4.16-25 Typical Water Tank Elevations................................................................................ 4.16-26 Soil Types on the Project Site ......................................................................................4.19-9 Site Suitability for Farming ..................................................................................... 4.19-12 Farmlands of Importance on the Project Site............................................................... 4.19-13 Project Study Area......................................................................................................4.20-5 Standing Water Locations...........................................................................................4.20-8 Santa Clara River Existing Conditions – 2 Year Flood Event....................................... 4.20-11 Santa Clara River Existing Conditions – 5 Year Flood Event....................................... 4.20-12 Santa Clara River Existing Conditions – 10 Year Flood Event..................................... 4.20-13 Santa Clara River Existing Conditions – 20 Year Flood Event..................................... 4.20-14 Santa Clara River Existing Conditions – 50 Year Flood Event..................................... 4.20-15 Santa Clara River Existing Conditions – 100 Year Flood Event ................................... 4.20-16 Santa Clara River Existing Conditions – Capital Flood Event.................................... 4.20-17 Santa Clara River Existing Velocities – 2 Year Flood Event ....................................... 4.20-20 Santa Clara River Existing Velocities – 5 Year Flood Event ....................................... 4.20-21 Santa Clara River Existing Velocities – 10 Year Flood Event...................................... 4.20-22 Santa Clara River Existing Velocities – 20 Year Flood Event...................................... 4.20-23 Santa Clara River Existing Velocities – 50 Year Flood Event...................................... 4.20-24 Santa Clara River Existing Velocities – 100 Year Flood Event.................................... 4.20-25 River Habitat.......................................................................................................... 4.20-28 Typical Cross-Section for Buried Bank Stabilization................................................. 4.20-39 Bank Stabilization and Bridge Locations .................................................................. 4.20-40 Santa Clara River Proposed Conditions – 2 Year Flood Event ..................................... 4.20-43 4.16-7 4.16-8 4.16-9 4.16-10 4.16-11 4.19-1 4.19-2 4.19-3 4.20-1 4.20-2 4.20-3a 4.20-3b 4.20-3c 4.20-3d 4.20-3e 4.20-3f 4.20-3g 4.20-4a 4.20-4b 4.20-4c 4.20-4d 4.20-4e 4.20-4f 4.20-5 4.20-6 4.20-7 4.20-8a

Revised Section 4.6 Biological Resources Draft Environmental

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