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Sonoma County Water Agency's Stream Maintenance Program

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Sonoma County Water Agency's Stream Maintenance Program Sonoma County Water Agency’s Stream Maintenance Program Annual Notification Report for 2017 Maintenance Projects Prepared for: The Stream Maintenance Program Inter-Agency Working Group Storm Debris, Copeland 5 at Snyder Road, January 11, 2017 April 30, 2017 sonomacountywater.org Sonoma County Water Agency’s Stream Maintenance Program Annual Notification Report for 2017 Maintenance Projects April 30, 2017 Prepared by: Sonoma County Water Agency Contact: Keenan Foster Phone: 707-547-1941 404 Aviation Boulevard Santa Rosa, CA 95406 Table of Contents Page Introduction………………………………………………………………………………………………………….......... iv Notification Review and the SMP Manual……………………………………………………………. iv SFBRWQCB Project Specific Notification………………………………………………………………. iv Section 1: Proposed Project Lists, Locations and General Information…………………………………………………………………………………………………………………. 1 1.1. Ground Disturbing Project Site List, Locations, Management Triggers and General Information…………………………………………………………………………………………….. 1 1.2. Vegetation Management Activity List……………………………………………………………. 6 1.3. Activities on Restriction-Imposed Creeks………………………………………………………. 15 1.4. Best Management Practices by Program Activity…………………………………………… 18 Section 2: Project Specifications and Design Drawings…………………………………………. 21 2.1. Ground Disturbing Project Specifications………………………………………………………. 21 2.2. Ground Disturbing Project Designs………………………………………………………………… 23 Section 3: Project Setting, Resources and Pre-Maintenance Surveys……………………………. 101 3.1 Project Setting, Species and In-stream Habitat Features………………………………… 101 3.2 Project Site Photographs………………………………………………………………………………… 106 3.3. Species-Specific Information…………………………………………………………………………. 120 3.3.1. California Tiger Salamander……………………………………………………………. 120 3.3.2. California Red-legged Frog……………………………………………………………... 122 3.3.3. Foothill Yellow-Legged Frog……………………………………………………………. 122 3.3.4. Site Surveys for Special-Status Plant Species…………………………………… 123 3.3.5. Additional Wildlife Surveys Planned……………………………………………….. 124 3.4. Cultural Resources………………………………………………………………………………………… 126 Section 4: Annual Mitigation Plan………………………………………………………………………………… 127 4.1. On-Site Mitigation Activities (Tier 1)……………………………………………………………… 127 4.2. Off-Site Mitigation Activities (Tiers 2 and 3)…………………………………………………… 135 4.3. Sediment Basins, Reservoir Outlets and Concrete-lined Structures…………………………………………………………………………………………………………….. 138 4.4. Vegetation Management Mitigation Activities………………………………………………. 139 4.5. Estimated Project Costs, Areas of Impact and Mitigation Accounting……………………………………………………………………………………………………......... 141 Section 5: Sediment Testing, Disposal and Reuse Plan………………………………………………… 144 5.1. Sediment Sampling and Testing…………………………………………………………………… 144 5.2. Sediment Disposal and Reuse Plan………………………………………………………………… 144 Appendices: Appendix A: Project Location Maps with April 2017 California Diversity Database (CNDDB) Information Overlay Appendix B: Rodgers Creek, Reaches 1 and 0A Supplemental Materials: Reach Map, Record Drawing and Characterization Sheets Appendix C: Project Maps with California Tiger Salamander (CTS) Occurrence Overlay Appendix D: 2016 SMP Annual Post-Maintenance Summary Report Addendum Appendix E: Permit Fees and Application Materials Introduction The Sonoma County Water Agency (Water Agency) prepared this Notification report (Notification) to provide responsible agencies with information regarding anticipated Stream Maintenance Program (SMP) (Program) projects for the upcoming season. The information in this Notification is intended to meet the individual reporting requirements of the Program’s regulating agencies: California Department of Fish and Wildlife (CDFW); National Marine Fisheries Service (NMFS); North Coast Regional Water Quality Control Board (NCRWQCB); San Francisco Bay Regional Water Quality Control Board (SFBRWQCB); United States Army Corps of Engineers (USACE); and United States Fish and Wildlife Service (USFWS). To the extent feasible, data presented in this Notification is organized so that information applicable to the Flood Control Zones (Zones) under the separate authorities of the NCRWQCB and SFBRWQCB may be easily accessed by reviewers. Notification Review and the SMP Manual The SMP Manual1 was developed to establish and define the overall maintenance program and to describe the Program’s maintenance activities, natural resources, and approaches to avoid or minimize impacts to environmental resources. The Manual serves as the description of activities permitted by the relevant regulatory agencies. The SMP Manual is intended to serve as a companion document to this Notification. To facilitate Notification review, information presented in the SMP Manual is referenced or summarized rather than repeated herein. Confirmation of adherence to activity descriptions and Best Management Practices (BMPs) as described in the Manual are provided for each project, as appropriate, and any deviations from the Manual are clearly identified and explained herein. SFBRWQCB Project Specific Notification The SFBRWQCB requires additional information (Project Specific Notification) for maintenance work proposed in modified or natural channels, as well as for reach-scale activities on engineered channels. Beginning in 2017, this supplemental information has been integrated into the Notification to provide more efficient reporting and remove the need for multiple, separate documents. To facilitate Project Specific Notification review by the SFBRWQCB, a directory noting where required information is presented herein is included below in Table 1- 1. 1Horizon Water and Environment. 2009. Stream Maintenance Program Manual. Final. September. (HWE 08.002.) Oakland, CA. iv Table 1-1. SFBRWQCB Project Specific Notification Directory. San Francisco Bay Regional Water Quality Control Board Project Specific Notification Requirements (Provision D. 54). Requirement Location within Notification Section 3, photograph sheets, Photo documentation of existing conditions pages 106-119 Project type (scale) and location: Section 1, Table 1-2, pages 2-5; Project specifications: A description of the project Section 2, Table 2-1, pages 21-22; On-site mitigation: Section 4, Table 4-1, pages 127-129 An assessment of the need for the proposed maintenance Section 1, Table 1-2, pages 2-5 activities Measures taken to avoid and minimize impacts to beneficial Section 1, Table 1-5, pages 18-20 uses Six photo-documentation points at each project site. These photo-documentation sites shall be selected to document Section 3, photograph channel and bank conditions immediately upstream and sheets, pages 106-119 downstream of each project site, as well as the project reach Determine if any of the proposed projects could impact any channels identified as functioning as potential habitat for threatened or endangered species, or providing habitat for Section 3, Table 3-1, pages 102-105 different life cycles for salmonids (i.e., migration, spawning, rearing, or refugia) Describe what BMPs including the retention of instream habitat Section 3, Table 3-1, pages 102-105 features will be taken v Section 1 Proposed Project Lists, Locations and General Information This section lists the proposed ground-disturbing projects for the 2017 field season and provides project site geographic information as well as general project information. Proposed vegetation management projects are also listed at the end of this section. 1.1. Ground Disturbing Project Site List, Locations, Management Triggers and General Information Annual project needs are determined based on condition assessments conducted over the previous rainy season. Depending on precipitation patterns, frequency, intensity, and volume- work in specific areas varies from year to year. The Water Agency conducts reconnaissance of maintenance reaches (approximately February-April) to identify maintenance needs and develop the high priority work plan for the coming year. Work needs are determined based on an evaluation of observed maintenance triggering conditions for both sediment removal and/or vegetation management on each reach. Table 1-2 below presents the proposed 2017 ground- disturbing projects and associated maintenance triggers. The table also presents location, geographic, and general information for each of the proposed projects. For a complete description of each project type (reach scale, localized scale, reservoir outlet clearings, bank stabilizations and in-stream sediment basin clearing [targeted sediment removal]), please see SMP Manual Section 6. Project location maps are provided in Appendix A. Anticipated vegetation management projects are described in the next section. Table 1-2. Proposed 2017 SMP ground disturbing projects, locations, management triggers, and general information. Deviations from SMP Manual USGS Quad, activity Township, Latitude/ descriptions or Project name Location description1 Creek Tributary to Range, Section Longitude Sediment management trigger(s) BMPs2 Other project notes Zones 1A, 4A and 5A Reach-scale projects Targeted sediment removal Zone 1A. Between Seed SR-6: sediment is aggrading such that flood conveyance, Copeland 2 Copeland Laguna de Cotati Quad, T6N, 38.343 N, throughout reach. In-stream features Farm Drive and channel capacity, and/or freeboard requirements are None Creek Santa Rosa R8W, Section 26 -122.707 W (pools and low-flow channel) to be Commerce Boulevard compromised restored/installed as feasible. Zone 1A. Between Habitat enhancement project. confluence with
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