Draft Resource Management Plan for Potrero/Mason Property San Diego County April 2018 The County of San Diego Department of Parks and Recreation is pleased to announce the availability of the Draft Potrero/Mason Property (Property) Resource Management Plan (RMP) for public review and comment. This RMP has been prepared as a guidance document to manage and preserve the biological and cultural resources within the Property. As part of the RMP effort, biological and cultural surveys were conducted in 2012 to characterize the baseline conditions of the Property needed to develop future management and monitoring efforts. The vegetation communities within the Property include coast live oak woodland, eucalyptus woodland, chamise chaparral, coastal sage-chaparral transition, northern mixed chaparral, southern mixed chaparral, scrub oak chaparral, Diegan coastal sage scrub, coastal scrub/chaparral, non-native grassland, and foothill/mountain perennial grassland. These vegetation communities support multiple sensitive species including: coast horned lizard, loggerhead shrike, white-tailed kite, and Dulzura pocket mouse. If you have any questions, please contact Jennifer Price at (858) 966-1375. Please send your comments to the attention of Jennifer Price, via mail at 5500 Overland Avenue, Suite 410, San Diego, CA 92123; via fax to (858) 495-5841; or via email to [email protected] by May 17, 2018. Potrero/Mason Property April 2018 Draft Resource Management Plan TABLE OF CONTENTS 1.0 INTRODUCTION ........................................................................................ 1 1.1. Purpose of Resource Management Plan ................................................ 1 1.1.1 MSCP Background .............................................................................. 3 1.1.2 Framework Resource Management Plan .......................................... 3 1.2. Implementation ....................................................................................... 3 1.2.1 Management Approach ..................................................................... 3 1.2.2 Responsible Parties/Designation of Land Manager .......................... 4 1.2.3 Regulatory Context............................................................................ 4 1.2.4 Limitations and Constraints ............................................................... 5 2.0 PROPERTY DESCRIPTION ...................................................................... 5 2.1 Legal Description .................................................................................... 5 2.2 Geographical Setting .............................................................................. 5 2.2.1 Site Access ....................................................................................... 5 2.2.2 MSCP Context .................................................................................. 6 2.3 Physical and Climatic Conditions ............................................................ 9 2.3.1 Geology and Soils ............................................................................. 9 2.3.2 Climate ............................................................................................ 11 2.3.3 Hydrology ........................................................................................ 12 2.3.4 Fire History ...................................................................................... 12 2.4 Land Use .............................................................................................. 12 2.4.1 On-Site Land Use ............................................................................ 12 2.4.2 Adjacent Properties ......................................................................... 15 2.4.3 Easements or Rights ....................................................................... 15 2.5 Trails ..................................................................................................... 15 3.0 BIOLOGICAL RESOURCES DESCRIPTION .......................................... 19 3.1 Vegetation Communities/Habitat .......................................................... 19 3.2 Plant Species ........................................................................................ 29 3.2.1 Plant Species Present ..................................................................... 29 3.2.2 Rare, Threatened, or Endangered Plant Species Present .............. 29 3.2.3 Rare, Threatened, or Endangered Plant Species not Observed but with High Potential to Occur ............................................................ 33 3.2.4 Non-native and/or Invasive Plant Species ....................................... 34 3.3 Wildlife Species .................................................................................... 36 3.3.1 Wildlife Species Present .................................................................. 36 3.3.2 Rare, Threatened, or Endangered Wildlife Species Present ........... 39 3.3.2.1 Herpetofauna ............................................................................ 41 3.3.2.2 Birds ......................................................................................... 41 3.3.2.3 Mammals - Small Mammals...................................................... 45 3.3.2.4 Bats .......................................................................................... 47 i Potrero/Mason Property April 2018 Draft Resource Management Plan 3.3.3 Rare, Threatened or Endangered Wildlife with High Potential to Occur ............................................................................................... 50 3.3.3.1 Invertebrates ............................................................................. 50 3.3.3.2 Herpetofauna ............................................................................ 50 3.3.3.3 Birds ......................................................................................... 51 3.3.3.4 Mammals .................................................................................. 51 3.3.4 Non-native and/or Invasive Wildlife Species ................................... 52 3.4 Overall Biological and Conservation Value ........................................... 52 3.4.1 Wildlife Linkages and Corridors ....................................................... 52 4.0 CULTURAL RESOURCES ...................................................................... 53 4.1 Site History ........................................................................................... 53 4.1.1 Pre-Contact ..................................................................................... 53 4.1.2 Post-Contact ................................................................................... 54 4.1.3 Historic Overview of the Potrero Mason Property ........................... 57 4.2 Native American Consultation .............................................................. 63 4.3 Cultural Resource Descriptions ............................................................ 64 4.3.1 Prehistoric Archaeological Resources ............................................. 64 4.3.2 Historic Sites ................................................................................... 65 4.4 Resource Significance .......................................................................... 67 5.0 RESOURCE MANAGEMENT .................................................................. 69 5.1 Management Goals and Objectives ...................................................... 69 5.1.1 Management Directives and Implementation Measures.................. 69 5.2 Biological Resources Element (A) ........................................................ 69 5.2.1 Biological Monitoring ....................................................................... 69 5.2.3 Non-Native Invasive Wildlife Species Control ................................. 70 5.2.4 Future Research ............................................................................. 71 5.3 Vegetation Management Element (B) .................................................. 71 5.3.1 Habitat Restoration.......................................................................... 71 5.3.2 Invasive Non-Native Plant Species Removal and Control ............... 72 5.3.3 Fire Prevention, Control, and Management ..................................... 72 5.4 Public Use, Trails, and Recreation Element (C) ................................... 75 5.4.1 Public Access .................................................................................. 75 5.4.2 Fencing and Gates .......................................................................... 76 5.4.3 Trail and Access Road Maintenance ............................................... 77 5.4.4 Signage ........................................................................................... 78 5.5 Operations and Facility Maintenance Element (D) ............................... 78 5.5.1 Litter/Trash and Materials Storage .................................................. 78 5.5.2 Hydrological Management ............................................................... 79 5.5.3 Emergency, Safety and Police Services .......................................... 79 5.5.4 Adjacency Management Issues ...................................................... 80 5.6 Cultural Resources Element (E) ........................................................... 80 6.0 REFERENCES ......................................................................................... 86 ii Potrero/Mason Property April 2018 Draft Resource Management Plan TABLES Table 1.