APPENDIX H

WAGON WHEEL CREEK RESTORATION PLAN MAINTENANCE PROGRAM

Wagon Wheel Creek Restoration Plan Maintenance Program

General Thomas F. Riley Wilderness Park Orange County, California

Submitted to

OC Community Resources

13042 Old Myford Road Irvine, California 92602

Prepared by

Consulting Services, Inc.

WRC Consulting Services, Inc. 1800 East Garry Avenue, Suite 213 Santa Ana, California 92705 (949) 833-8388

June 2013

Project Team

Consulting Services, Inc.

WRC Consulting Services, Inc. Lan Weber, P.E., Ph.D. Principal Civil Engineer

Dan Nove Senior Planner and Operation Specialist

Rebekah Beardshear Planner and Graphic Designer

Margot Griswold, Ph.D. Principal Biologist (Newfields)

Mark Denny, Director

John Gannaway, Parks Division Manager

Barbara Norton, Parks Division Manager

Scott Thomas, Manager, Design

Joanne Quirk, Project Manager

Mark Estoque, Environmental Engineer Specialist

Robin LaMont, NPDES Coordinator, Environmental Compliance Support

Bill Kirk, Manager, Systems and Resource Management Division

Jeremy Hampton, Manager, CMMS Operations

Jennifer Naegele, Restoration Ecologist/Resource Specialist

Gabriel Lopez, Senior Maintenance Coordinator, South Division

Rod Hawkins, Maintenance Crew Supervisor III, Caspers/Riley

Dennis Shaffer, Supervising Park Ranger

Carroll Baldwin, Senior Park Ranger

Wagon Wheel Creek Restoration Plan Maintenance Program Table of Contents

Section 1 - Introduction ...... 1

1.1 Wagon Wheel Creek Restoration Plan Objectives and Maintenance Needs ...... 1

1.2 Document Organization ...... 4

1.3 Inspection and Maintenance Areas ...... 4

Section 2 - Maintenance Responsibility ...... 7

Section 3 - Work Descriptions ...... 9

3.1 Overall Vegetation Maintenance ...... 9

3.2 Riparian Planting Establishment ...... 9

3.3 Channel Sections and Grades ...... 11

3.4 Drop Structures ...... 12

3.5 Sheet Piles...... 13

3.6 ArmorFlex ...... 14

3.7 Plain Riprap ...... 14

3.8 Derrick Stones ...... 15

3.9 Grouted Riprap ...... 16

3.10 Lateral Storm Drain Flow Control ...... 17

3.11 Sediment Control ...... 17

3.12 Debris Control ...... 18

3.13 Minor Structures ...... 19

3.13.1 Earthen Berms ...... 19

3.13.2 Culverts for Creek Crossing ...... 19

3.13.3 Outlet Protection (Not Part of WWCRP) ...... 20

Section 4 - Work Periods, Frequencies, Sequences and Accesses ...... 20

4.1 General Requirements ...... 20

4.2 High Priority Areas ...... 24

4.2.1 Sheet Pile No. 1 (Area 1) ...... 24 4.2.2 Oso Parkway Culvert (Area 7) ...... 25

i Wagon Wheel Creek Restoration Plan Maintenance Program

4.2.3 Entrenched Sections (Downstream & Upstream of Area 7) ...... 26

4.2.4 Wide Area Sections (Area 8) ...... 28

4.2.5 Downstream of Pedestrian Bridge (Area 9) and Upstream of Pedestrian Bridge (Area 9B) ...... 29

4.3 Medium Priority Areas ...... 31

4.3.1 ArmorFlex Area (Area 2) ...... 31

4.3.2 Downstream of Vela Court (Area 4) ...... 33

4.3.3 Near Park Ranger Station (Area 6) ...... 34

4.3.4 Stormwater Management (Area 11) ...... 35

4.4 Low Priority Areas ...... 36

4.4.1 Downstream of S-Turn (Sheet Pile No. 2) ...... 36

4.4.2 S-Turn Area (Area 3) ...... 38

4.4.3 Between Vela Court and Sandy Knoll (Sheet Pile No. 3) ...... 39

4.4.4 Upstream of Oak Canyon Creek (Area 5) ...... 40

Section 5 - Inspection Checklists ...... 41

Section 6 - Emergency Maintenance ...... 42

List of Tables & Figures

Figure 1 WWCRP Key Map ...... 2

Table 1 WWCRP Improvement Matrix ...... 3

Figure 2 Maintenance and Emergency Access Gates ...... 5

Appendix A - Inspection & Maintenance Figures

Figure A.1 Inspection & Maintenance Boundary for Area 1 (Sheet Pile 1)

Figure A.2 Inspection & Maintenance Boundary for Area 2 (ArmorFlex Area)

Figure A.3 Inspection & Maintenance Boundary for Sheet Pile No. 2 (Downstream of S-Turn)

Figure A.4 Inspection & Maintenance Boundary for Area 3 (S-Turn Area)

Figure A.5 Inspection & Maintenance Boundary for Area 4 (Downstream of Vela Court)

Figure A.6 Inspection & Maintenance Boundary for Sheet Pile No. 3 (Between Vela Ct. & Sandy Knoll) ii Wagon Wheel Creek Restoration Plan Maintenance Program

Figure A.7 Inspection & Maintenance Boundary for Area 5 (Upstream of Oak Canyon Creek)

Figure A.8 Inspection & Maintenance Boundary for Area 6 (Near Park Ranger Station)

Figure A.9 Inspection & Maintenance Boundary for Area 7 (Oso Creek Culvert)

Figure A.10 Inspection & Maintenance Boundary for Downstream & Upstream of Area 7 (Entrenched Sections)

Figure A.11 Inspection & Maintenance Boundary for Area 8 (Wide Area Sections)

Figure A.12 Inspection & Maintenance Boundary for Area 9 (Downstream and Upstream of Pedestrian Bridge)

Figure A.12.2 Extended Inspection & Maintenance Boundary for Area 9B (Upstream of Pedestrian Bridge)

Figure A.13 Inspection & Maintenance Boundary for Area 11 (Including Area 10/Gabion Area)

Figure A.14 Construction/Maintenance Access Ramp Detail No. 1

Figure A.15 Construction/Maintenance Access Ramp Detail No. 2

Figure A.16 Construction/Maintenance Access Ramp Detail No. 3

Appendix B - Inspection Checklists

Area 1 Inspection Checklist (Sheet Pile #1)

Area 2 Inspection Checklist (ArmorFlex Area)

Sheet Pile No.2 Inspection Checklist (Downstream of S-Turn)

Area 3 Inspection Checklist (S-Turn Area)

Area 4 Inspection Checklist (Downstream of Vela Court)

Sheet Pile No. 3 Inspection Checklist (Between Vela Court & Sandy Knoll)

Area 5 Inspection Checklist (Upstream of Oak Canyon Creek)

Area 6 Inspection Checklist (Near Park Ranger Station)

Area 7 Inspection Checklist (Oso Creek Culvert)

Downstream & Upstream of Area 7 Inspection Checklist (Entrenched Sections)

Area 8 Inspection Checklist (Wide Area Sections)

Area 9 & Area 9B Inspection Checklist (Downstream and Upstream of Pedestrian Bridge)

Area 11 Inspection Checklist (Stormwater Management)

iii

Wagon Wheel Creek Restoration Plan Maintenance Program Section 1 - Introduction 1.1 Wagon Wheel Creek Restoration Plan Objectives and Maintenance Needs Wagon Wheel Creek, located within General Thomas F. Riley Wilderness Park (Park), has experienced extensive downcutting and bank erosion during past flood events. This historically small creek has been widened and entrenched due to erosion, which continues to threaten the health of the creek, the existing trail system, and survival of significant oak trees. A restoration plan, referred to as the Wagon Wheel Creek Restoration Plan (WWCRP), January 18, 2012 Updated June 2013, was prepared by WRC Consulting Services, Inc., under the supervision of OC Parks. The recommended WWCRP work elements are sparsely located within an approximately 1.6-mile reach beginning at Sheet Pile No. 1 and continuing upstream to the pedestrian bridge, as shown in Figure 1. The original plan has been modified to address recent erosion downstream of the pedestrian bridge in Area 9 and stormwater management opportunities upstream the pedestrian bridge in Area 11.

The challenge in the creek’s restoration centers around the need to maintain a balance among creek stability, ecology, and cost of implementation and maintenance. The proposed plan presents interim measures which provide sufficient stabilization and/or preventive measures to ‘manage’ the ‘immediate threats’ to the creek’s health as well as prevent ‘potential catastrophic failures’. In lieu of a traditional ‘fix-it-all’ solution, this plan supports the natural recovery processes of the creek. With phased restoration and promotion of the creek’s own healing processes, it is anticipated that the severely eroded areas can be repaired over time and that the existing stable reaches can be protected from future major failure. Since these interim measures are strategically located in several distinct areas along a long reach of the creek, it is essential to follow up with post-construction monitoring and routine inspection and maintenance. These activities shall be performed not only at each proposed WWCRP implementation area, but also along the adjacent reaches, where the overall stability of the creek depends on the integral protection from the various individual measures.

This report provides a guideline for inspection and maintenance of Wagon Wheel Creek within the park with a focus on restoring creek stability by maintaining the proposed restoration measures as stated in the WWCRP. The proposed restoration construction elements, summarized in Figure 1 and Table 1, are grouped into high, medium and low priorities. The inspection and maintenance team members must recognize these restoration areas, which are referenced throughout the documents. Routine inspection and maintenance activities to safely keep these elements in place and to function as designed are detailed in these guidelines.

Due to the dynamic nature of the creek environment, inspection and maintenance activities are an integral part of the WWCRP. All maintenance and inspection personnel are encouraged to fully understand the functions of all proposed improvements within each construction area described in the WWCRP and Sections 3 and 4 in this document. In the event that field conditions deviate from the restoration plans, their awareness of the functions of these elements and knowledge of the difference between normal and problematic creek stability can be extremely valuable in making proper inspection notes and seeking timely responses. The inspection and maintenance routines cover, but are not limited to, the following: creek bed and slope erosion control, lateral drains, trails, access roads, bridge or culvert crossings, fencing, exotic and non-native plant removal, new plant establishment

1 Wagon Wheel Creek Restoration Plan Maintenance Program Figure 1 - WWCRP Key Map

2 Wagon Wheel Creek Restoration Plan Maintenance Program Table 1 - WWCRP Improvement Matrix

Location* Priority Section No. Improvement Needs Stormwater Management upstream of Instream Berm, Flow Control, Native Planting and Medium Overflow Bank Protection. Peak Discharge Reduction (Area 11) Figure 19 Area 10 to RCB via Natural Area Retention and Infiltration. Gabion Area Pending No Action; Inspection Only. (Area 10) Figure 18

Downstream of Pedestrian Bridge 9449, 9504, 9562, High** Drop Structures, Scour Repair and Riparian Planting. (Area 9) Figure 17 9645, and 9711 New Berm with Trail for Concrete Ditch Control. Add Wide Area Sections Safety Railing. Toe and Slope Planting, Bank Toe High from 9134 to 9320 Erosion Control, Vegetation and Earthen Berms (Area 8) Figures 13, 13a, 14-16 Crossing the Channel to Redirect Low Flows and Recreate Ecosystem System. Pipe Outlet Energy Dissipation. Concrete Weir for Oso Parkway Culvert – Alternative 2 Flood Flow Crossing and Seepage/Underdrain for Dry High near 8645 (Area 7) Figure 12 Weather Flows. Tributary and Confluence Area Erosion Protection with Stones and Riparian Planting.

Entrenched Sections (Downstream 7461, 7853, 8270, Check Dam Invert Control for Entrenched Sections and High & Upstream of Area 7) Figure 10 8645, and 8843 Riparian Plantings.

Medium at 5710 and 5840 Grade Control and Riparian Planting.

Widening of West Bank and Riparian Planting. Toe and Medium from 5710 to 5840 Invert Protection with Riprap Stones. Near Park Ranger Station

(Area 6) Figure 9 Low Flow Realignment and Bank Toe Protection with Medium upstream of 5840 Stones and Riparian Planting.

Reduce Flooding and Sediment Deposition with a New at Entrance Road Drainage Crossing. Raise Adjacent Ground to Control Medium Crossing Encroach Flows. Riparian Planting and Native Landscaping. Upstream of Oak Canyon Creek Low near 5109 Grade Control Check Dam and Riparian Planting. (Area 5) Figure 8 Between Vela Ct. & Sandy Knoll Low from 2791 to 3997 Riparian Planting. (Sheet Pile 3) Figure 7 Downstream of Vela Court Medium 2684 Grade Control and Riparian Planting. (Area 4) Figure 6 S-Turn Area Low 2290 Bank Protection and Riparian Planting. (Area 3) Figure 5 Downstream of S-Turn Area Low 1985 Scour Protection and Riparian Planting. (Sheet Pile 2) Figure 4 ArmorFlex Area Reinforce ArmorFlex Toedown, Rock Placement and Medium 1706 (Area 2 ) Figure 3 Riparian Planting. Sheet Pile 1 High** 1028 Sheet Pile Reinforcement and Scour Protection. (Area 1) Figure 2 * Sequence listed from upstream to downstream for graphic match with opposite page Figure 1. Figures listed refer to the WWCRP Figures. ** Improvements for these areas are most critical.

3 Wagon Wheel Creek Restoration Plan Maintenance Program and existing plant preservation. These activities are included to ensure that the goal of the WWCRP is achieved without fully relying on the project’s constructed features, and also includes gradual ecological establishment and ongoing stabilization along the creek. These are also valuable for detecting any new threats to the creek. 1.2 Document Organization This document provides a detailed description of the following:

 Inspection and maintenance boundaries are shown in Figures A.1 to A.13 in Appendix A and are briefly described below in Section 1.3.  Ingress and egress to and from adjacent streets and properties at various WWCRP locations are identified in Figure 2. The inspection and maintenance accesses to each specific WWCRP area are shown in Figures A.1 to A.13. These are referenced in Section 1.3 and Section 4.  Responsible personnel, reporting processes, and maintenance work authorization which maintenance personnel should be aware of are briefly described in Section 2.  Key functions, potential concerns, and maintenance needs for the restoration components are described in Section 3. This is to provide inspection and maintenance personnel with a technical background for training or review prior to field work.  Seasons allowed for various inspection/maintenance activities including work periods, frequencies, and recommended sequences specifically for each WWCRP construction area are presented in Section 4.  A detailed checklist of recommended inspection activities for each WWCRP construction area is included in Section 5.  Section 6 describes general awareness, preparedness and emergency protection measures. This document does not intend to address all the emergency services for the park or creek, as those would be dictated by the OC Parks Emergency Operation Plan. 1.3 Inspection and Maintenance Areas WWCRP Inspection and Maintenance Boundaries The WWRCP proposes improvements for thirteen distinct areas during the initial implementation of the restoration plan. Ingress and egress to and from adjacent streets or properties for routine inspection, maintenance or emergency services are displayed in Figure 2. Within each of the WWCRP improvement areas, the approximate inspection and maintenance boundaries are shown as Figures A.1 to A.13 in Appendix A. These figures show the ‘primary’ inspection and maintenance boundaries as well as the ‘extended’ inspection and maintenance boundaries for each improvement area. The inspection and maintenance activities for the WWRCP are focused on the ‘primary’ inspection and maintenance boundaries. Maintenance activities outside of the primary boundaries but within the extended boundaries can be performed less frequently than those for the primary boundaries. Activities described in Section 4 for high priority areas are more critical, but the less frequent work in the lower priority areas still requires the outlined inspection to avoid the new development of future problems.

4 Wagon Wheel Creek Restoration Plan Maintenance Program

Figure 2 - Maintenance and Emergency Access Gates

5 Wagon Wheel Creek Restoration Plan Maintenance Program

Since the WWCRP emphasizes the prevention of continuous downcutting and widening of the creek, there are numerous invert stabilization structures including riprap and sheet pile drop structures, grade-control stabilizers and check dams. The boundaries for the structures are extended to cover local erosion and sediment-deposition potentials.

Accesses to each inspection and maintenance area are displayed in Figures A.1 through Figure A.13. In general, most areas can be accessed via the trail/maintenance road along the east bank and various footpaths from the trail road to the banks. Heavy construction equipment is not expected to be required for inspection and most maintenance work, and should be limited to major repairs in areas with significant failure or stability concerns. Construction of access ramps for heavy equipment will be dependent on bank geometry (heights, slopes and benches) and bank stability. Figures A.14 through A.16 provide examples for ramp construction should heavy equipment be required to gain access to the creek bed.

Detail 1 (Figure A.14) is an example of conditions where the bank height is relatively small (up to about 10 feet) and slope is normal (2 horizontal to 1 vertical). The alignment for the ramp shown in Detail 1 typically involves less bank and riparian tree disturbance; this is the most desirable ramp configuration as long as the ramp extension outside of the bank line is manageable (assuming a 4 to 1 grade).

Detail 2 (Figure A.15) is an example for a typical ramp on relatively stable banks up to 20 feet in height. This includes areas with a total height of more than 20 feet from the channel invert to the top of the bank where the bank has a bench between the high bank and the low flow channel such as those present in the Entrenched Sections. If the channel bank is very unstable, Detail 1, Detail 3, or a combination of these configurations with Detail 2 may be applied to reduce bank disturbance.

Detail 3 (Figure A.16) is an example of ramp construction through an unstable steep bank with excessive height such as those in Area 8. Since the ramp is long, it may need to be steepened partially and fill into the creek along the construction vehicle path.

All the construction/maintenance ramps are to be protected against major erosion during the service period. These ramps, however, may interfere with the flow and cause local scour erosion. The interfering portion of the ramp is typically an encroachment to the main flow and must be removed after major construction or prior to a major storm.

Inspection and Maintenance Outside of WWCRP Boundaries It should be noted that the remaining creek outside of the inspection and maintenance boundaries shown in Figures A.1 to A.13 should also be routinely inspected, since it is part of the General Thomas F. Riley Wildness Park and may experience future erosion and sedimentation as a natural creek. These areas may be maintained as directed by OC Parks. One may also apply the technical background and guidelines from Sections 3 through 5, if applicable. A yearly inspection is recommended with the objective to identify any new developing issues and any measures needed to protect the creek, trail and biological resources.

6 Wagon Wheel Creek Restoration Plan Maintenance Program Section 2 - Maintenance Responsibility

Since the WWCRP involves technically challenging issues of creek stability, inspection and maintenance are a critical part of the program. This work, however, cannot be performed without the assignment of team responsibility and preparation or training for work knowledge prior to the work.

The team may primarily consist of the OC Parks staff relating to park operations and maintenance:

Maintenance Supervision  Parks Division Manager (South Parks Division)  Supervising Park Ranger  Senior Maintenance Coordinator

Routine Inspection and In-House Maintenance  Senior Park Ranger  Park Ranger  Park Maintenance Staff Contract Maintenance Authorization and Coordination  Parks Division Manager (South Parks Division)  Supervising Park Ranger  Senior Maintenance Coordinator Emergency Maintenance Authorization and Coordination  Parks Division Manager (South Parks Division)  Supervising Park Ranger  Senior Maintenance Coordinator

This team will be supported by the WWCRP development and permitting team including, but not limited to, the following:

OC Parks Design  Manager  WWCRP Project Manager  Environmental Engineer Specialist (Compliance)  NPDES Coordinator OC Parks Operations  Restoration Ecologist/Resource Specialist Vendor Resources  Design Consultant  Environmental Consultant  Contractors

7 Wagon Wheel Creek Restoration Plan Maintenance Program

The key individuals performing normal routine inspection and light maintenance are likely to be the Park Maintenance Staff, the Park Ranger and the Senior Park Ranger. They are required to have a full understanding of the inspection and maintenance scopes, needs, frequencies, accesses and area boundaries. These are all clearly identified in the first paragraph of Section 3 of this document. Formal training of these individuals prior to the work may be necessary, pending on-time urgency and the experience and technical-background of personnel.

The Park Ranger and Senior Park Ranger are to report progress, issues, questions, and/or maintenance needs to the Supervising Park Ranger. The Park Division Manager will assist the Supervising Park Ranger in reviewing the issues and providing directions for routine inspection and maintenance activities. The Park Rangers will request any supply of materials, equipment and contractor assistance from the OC Parks Systems Resources Management Division for any as-needed maintenance work which is outside of their capabilities or requires special materials and equipment.

The Design Manager, the WWCRP Project Manager, and vendors participating in the WWCRP development and permitting have first-hand knowledge of the project and are to serve as technical resources on the team. Periodic reporting to or field meetings with them will ensure that maintenance work is carried out to the specifications of the WWCRP. In addition, the Resource Specialist, Environmental Engineer Specialist and NPDES Coordinator are to be involved on the team to provide vital information on permit conditions from the regulatory agencies as well as the open space conservation and water quality requirements from the Orange County Public Works (OCPW) Watershed and Environmental Divisions.

To ensure the efficiency of the maintenance efforts, the team must:

1. Understand the site and what is expected to be ‘satisfactory’ without further actions, ‘questionable’ to be observed and obtain clarification of, or ‘unsatisfactory’, which clearly needs further action.

2. Follow recommended routine inspection frequencies, even if no problems are found during the first few visits. This is especially important for areas designated High Priority.

3. Document sites with pictures and clear notes so that others can follow up if actions are required or data are to be transferred to others. These can be provided during or outside of the routine inspection. These documents, combined with the inspection records, can be applied for purposes of defining a long-term inspection schedule and maintenance budget. These will be key contributors to the long-term management of WWCRP and as-needed modification to certain elements of the WWCRP.

4. Define clearly the procedures and processes for in-house reporting and requests in support of inspection and maintenance. Authorization to obtain as-needed assistance, materials or equipment may take time, and thus it is important to have streamlined procedures in place.

5. Ensure timely response to the reporting or request in support of inspection and maintenance work. It is essential that every report be assigned a limitation-of-review time so that the work flow can continue, to avoid any disruption of the work and the extra time taken to resume the work.

6. Make sure that permit conditions are well defined and understood or that consultation can be rapidly obtained, and that any maintenance work is scheduled so as to be performed without costly interruption.

8 Wagon Wheel Creek Restoration Plan Maintenance Program Section 3 - Work Descriptions

The WWCRP construction areas and restoration elements shown in Figure 1 and Table 1 are described in the WWCRP. The supporting data for these recommendations are presented in the technical reports relating to soils, geology, hydrogeology, hydraulics and biology. The key functions of each restoration component and its potential maintenance needs are summarized in this section in order to provide maintenance personnel with an understanding of the following aspects of the WWCRP: (1) the anticipated performance of each restoration element in each WWCRP construction area, (2) what to expect from creek response following project implementation, and (3) potential maintenance needs.

As stated in Section 1, the WWCRP specifically aims to promote the creek’s self-restoration with initial work within limited designated areas (shown in Figure 1 and Table 1). General inspection and maintenance are intended to be part of the plan.

Ideally, a creek channel would be self-sustaining and not require any maintenance. However, this is not the case for Wagon Wheel Creek in its current state and during implementation of the WWCRP. Long-term degradation is expected to be manageable after initial stabilization and scheduled maintenance during establishment. Typical maintenance work is required during the establishment period, and channel maintenance can be significantly decreased after restoration is in effect. 3.1 Overall Vegetation Maintenance Whenever possible, schedule work to minimize the extent of site disturbance at any one time. Typical vegetation maintenance activities will include:

 Replanting/replacement of trampled, dead or impaired vegetation.  Repair and replacement of fencing, signage and barriers for vegetation protection.  Repair or replacement of brush mattress, matting, or other soil bioengineering materials.  Seeding or reseeding, as necessary.  Ensuring adequate irrigation or water availability.  Regular removal of trash and debris over the project site. 3.2 Riparian Planting Establishment Key Function Vegetative establishment in the project area is a critical component of the project’s long term stability (i.e., success). In addition to providing natural habitat, riparian vegetation helps stabilize the soil, slows runoff, and dissipates its erosive energy and filters sediment from runoff. Riparian vegetation is established on bare soils in order to prevent surface erosion with increased flow resistance, minimize mass movement with root protection, provide habitat value with

9 Wagon Wheel Creek Restoration Plan Maintenance Program riparian and native planting, and enhance visual aesthetics for trail and park users. Vegetation protects the soil surface from raindrop impact, a major force in dislodging soil particles and moving them downslope. It also shields the soil surface from the scouring effect of overland flow and decreases the erosive capacity of the flowing water by reducing its velocity. Riparian vegetation can be used alone, but it also lends itself to conjunctive use with other erosion control techniques in a mutually beneficial manner. When properly utilized, riparian vegetation can stabilize loose riprap, provide soil stabilization beneath riprap stones, and serve as erosion control during flood events.

Potential Issues of Concern Careful planning, monitoring and maintenance are required for all of the installed vegetation. Increased browsing pressure from mammals, the potential for disease, and extreme weather conditions can reduce the success of the plant materials. Inspection and monitoring of the plant materials throughout the initial stage of development will assist in ensuring plant viability. The following notes describe potential issues which may be encountered during establishment:

 Most vegetation has constraints on the season of the year that planting can be performed.  Vegetation is especially vulnerable to disease, insects, excessive inundation and erosion before it becomes well established.  Typically, vegetative protection cannot be planned and installed with the same degree of confidence as structural protection.  Young plants and cuttings may need to be protected from deer or other herbivores.  The semi-arid conditions that are typical of Southern California may not provide an adequate water supply for maintaining the vegetation.  Large tree roots may threaten the integrity of bank soils or structural protection by directing flows into an adjacent unprotected bank or by leaving voids in embankments due to decomposition.  Hydrologic conditions (surface water and groundwater) must be favorable for the establishment and successful growth of vegetation.  Trunks of woody vegetation or clumps of brushy vegetation on armor revetment can cause local flow anomalies which may damage the in-channel structures of bank armoring.  Bioengineered erosion control can be maintenance-intensive, particularly in the early years.  Invasion by other species is likely to occur over time.

Potential Maintenance Needs and Activities Prior to any planting or replanting of vegetation, interim measures must be implemented to ensure that stormwater flow does not impact those areas prone to erosion.

Satisfactory stabilization and erosion control requires a full vegetative cover integrated with other erosion control materials. Even small breaches in vegetative cover can expand rapidly and, if left unattended, allow serious soil- loss from an otherwise stable surface. A single heavy rain is often sufficient to greatly enlarge bare spots, and the longer repairs are delayed, the more costly they become. Prompt action is necessary to reduce sediment-loss and repair cost.

10 Wagon Wheel Creek Restoration Plan Maintenance Program

Non-riparian plants which have deep roots will provide erosion control functions. It is a general rule that invasive, non-native and/or non-riparian plants which have the potential to impede the progress of riparian establishment are not desirable and should be removed. However, the non-native, invasive plants may cover the entire creek and require frequent and repetitive efforts to control the nuisance. These efforts depend on budget limitations, preservation policies, and staff work priority of OC Parks. Care must be taken in removing these plants from the WWCRP construction areas and highly erosive areas. It will require temporary erosion control where the removal activities may disturb the integrity of the stabilization work until the replacement plants sufficiently stabilize the disturbed area.

New seedlings should be inspected frequently and maintenance performed as specified by the project biologist. If rills and gullies develop, they must be filled in, reseeded and mulched as soon as possible. Diversions may be needed until the new plants take hold. Maintenance requirements will need to extend beyond the seeding phase. Damage to vegetation from disease, insects, animal browsing, visitor use, etc., can occur at any time. Vegetation established on disturbed soils often requires additional fertilization.

Vegetative plantings should be inspected frequently for disease, insect infestation, wildlife damage and high- water damage. Inspections are particularly vital during the project's initial establishment period and following severe flooding events. Fencing and posted signs can be used to alert park users to the revegetation activities. Any significant damage to vegetative plantings shall be reported immediately to the Senior Park Ranger at General Thomas F. Riley Wilderness Park. 3.3 Channel Sections and Grades Key Function The intended function of the WWCRP is to reduce erosion, particularly downcutting. This may be achieved with the channel sections and invert profiles as developed in the WWCRP and technical reports. The design sections and invert profiles resulted in hydraulic parameters and erosion/sedimentation characteristics which were used to guide channel-stabilization design in the WWCRP. As conditions warrant, any needs to modify the strategies implemented to achieve stable channel conditions will be evaluated.

Potential Issues of Concern Since the WWCRP does not suggest a total engineering solution, it is essentially a ‘hand to nature’ to repair the critical downcutting and habitat loss problems. It is anticipated, and is not of major concern, that normal erosion and sedimentation processes will continue to occur. Any major widening, deepening or steepening of Wagon Wheel Creek compared to the WWRCP base conditions, however, may imply problems of restoration or concerns for further deterioration or problems with projected restoration.

Potential Maintenance Needs and Activities All channel sections and grades will be observed and monitored with the intention of maintaining the sections and grades used for technical analysis for the development of the WWCRP. Any significant deviation(s) in either channel sections or grades shall be reported immediately to the Senior Park Ranger at General Thomas F. Riley Wilderness Park.

11 Wagon Wheel Creek Restoration Plan Maintenance Program 3.4 Drop Structures Key Function A variety of materials including boulders, gabions, concrete, sheet piles, wood logs or engineered logs can be applied to form drop structures. Drop structures are vertical or near-vertical structures built across the full width of the channel to prevent headcut erosion into the upstream reaches immediately downstream of a migrating erosion head. Structures without this designated elevation-loss are simply referred to as ‘Grade Control Structures’. ‘Check Dam’ refers to a series of drop and grade-control structures placed along a degrading reach to maintain the creek profile. Sheet piles are also a form of drop structures which require specialized construction and are further described in Section 3.5.

Drop structures can be constructed with a reverse and mild slope on the upstream side and with terraced small drops with irregular stones placed on irregular slopes on the downstream side. This will create a natural look with riffle and pool conditions. A drop structure created with natural woody debris and engineering logs is most desirable for restoration projects; however, the stability of such a drop structure and its high maintenance requirements are unfavorable factors for consideration in the WWCRP. A primary function of drop structures within the WWCRP is to control upstream migration of an erosion head in the bed of small to medium- sized creeks.

Drop structures create a distinct drop in the water surface elevation profile over the structure. This results in higher velocities at the drop; therefore, the drop structure requires protection against overturning and undermining due to downstream scour. Derrick stones are typically required to dissipate energy if the drop face is not armored with grout (referred to as grouted riprap). Properly designed extra depths (referred to as toedown) are required to be buried below the finished downstream grade; toedown conditions must be observed and evaluated during inspection and maintenance. In addition, a stone pad (either flat or preformed scour hole) will be placed for the anticipated local scour downstream of the drop structure. After implementation, riprap or derrick stones may disintegrate from each other due to erosion in the unprotected area.

Potential Issues of Concern  Stone pads can exhibit instability problems.  Special attention should be given to the transition areas where the structure begins or ends, or where there is a change from one material to another.  Headcutting from downstream can undermine the toe of the drop structure.  Derrick stones must be carefully placed in the proper location, as these cannot be easily transported.  Some construction materials may introduce weed control problems.

12 Wagon Wheel Creek Restoration Plan Maintenance Program

Potential Maintenance Needs and Activities Drop structures are critical components for the WWCRP; all design sections, grades and stone extensions should be observed with the intent to maintain stability. Any significant difference compared to design and initial construction should be reported to the Senior Park Ranger at General Thomas F. Riley Wilderness Park. 3.5 Sheet Piles Key Function Sheet pile drop structures are one type of invert stabilization measure to be applied from the WWCRP. Steel sheet piling consists of a series of steel sections with interlocking grooves or guides, known as clutches, along each edge of the section. Each pile is engaged, clutch to clutch, to form a continuous, impervious membrane in the ground.

Sheet piles are used as a form of drop structure within the WWRCP to provide grade-stabilization. The sheet pile is interlocked, providing a good barrier to downstream flows. Functioning as an invert control measure, sheet pile structures are placed across the width of the channel bottom with anchors deep into the stream banks to provide a barrier in the streambed in order to resist erosion forces and maintain streambed elevation. Each structure serves as a drop structure providing invert control at locations where there is a discontinuity in the channel invert elevations.

Under the WWCRP, sheet piles with derrick and large riprap stones are to be applied where existing sheet piles were damaged or to minimize large disturbances to high, unstable banks.

Potential Issues of Concern  Sheet Pile No. 1 was bent toward downstream and the low-flow segment is partially disengaged.  Installation of sheet piles is very expensive. Any unfavorable erosion condition which may result in sheet pile failure must be addressed as soon as possible.  Riprap is required along the stream banks and downstream of the structure to prevent stream bank erosion, local scour and undermining of the sheet pile.  The elevation drop in sheet piles No. 2 and No. 3 is only two to three feet; however, the stability potential due to bank erosion or downstream scour is similar. The depths of existing sheet piles are unknown, and future stability problems may develop.

Potential Maintenance Needs and Activities Sheet pile panels must be maintained to provide uniform flow and structural integrity. Derrick stones placed downstream of the sheet piles and other riprap and plants surrounding the sheet pile wall shall be maintained as designed. Any significant change(s) to the sheet piles shall be reported immediately to the Senior Park Ranger at General Thomas F. Riley Wilderness Park.

13 Wagon Wheel Creek Restoration Plan Maintenance Program 3.6 ArmorFlex Key Function ArmorFlex is an erosion control system consisting of precast concrete blocks interconnected by galvanized steel cables to form a flexible protective mattress. The primary function of the ArmorFlex application in Wagon Wheel Creek is to provide channel lining and streambank erosion-protection.

Potential Issues of Concern  ArmorFlex components are subject to flood damage or disintegration from the mattress over time and may be vulnerable to vandalism.  Edge erosion, lifted blocks or ground depression may cause disintegration.  The filter fabric beneath the blanket can become damaged and lead to erosion and undermine the blanket.

Potential Maintenance Needs and Activities Inspect and maintain as needed to ensure that the ArmorFlex blocks (the surface of the blocks should be level with the ground), cable integration, edge toe-down and riprap or plants as part of bank and bed scour-protection are functioning as designed. Any significant change(s) which may affect the ArmorFlex stability shall be reported immediately to the Senior Park Ranger at General Thomas F. Riley Wilderness Park. 3.7 Plain Riprap Key Function Riprap stones are largely applied in the WWCRP to increase flow-resistance and reduce erosion due to high- velocity impacts. The stones are used to build invert control structures, bank protection measures, storm drain outlet erosion control pads, energy dissipaters and preformed scour holes.

Plain riprap refers to a protective blanket of graded loose stones which may be placed either by hand or by machine to achieve a desired configuration. The term ‘plain riprap’ has been introduced to differentiate loose stones from grouted riprap, which includes a partial filling of concrete grout within the voids. Riprap stone rocks are differentiated from derrick stones by the size of the stones or rocks, being typically less than 48 inches in diameter. Riprap stones are angular except for certain applications with round river rocks for aesthetic or environmental values.

Riprap bed protection is done to armor a reach of channel bed and may mimic natural scour pool features downstream of the large drop structure or drainage outlet. Riprap bank protection will be placed in critical erosion areas as an integral part of invert control including grade-control, drop structures, ArmorFlex and sheet piles.

14 Wagon Wheel Creek Restoration Plan Maintenance Program

In non-critical areas, most riprap stones are to be placed as riprap pads of specific gradation and thickness. Large riprap stones are also to be placed, either randomly or continuously, along the toe of the slope or near the concrete pods, trees, sheet pile, and grouted riprap or ArmorFlex as energy-dissipater buffers for the soft surface.

Plain riprap may also be used when implementing bioengineering restoration techniques by vegetating under the stone and/or boulder armoring during construction or using pole planting and live-staking techniques. The goal of this method is to enhance the survivability of the plantings and increase the stability of the bank.

All riprap material and placement shall conform to Orange County Public Works Standard Plan 1809 (Special Provisions - Stonework).

Potential Issues of Concern  Riprap may fail due to insufficient gradation, thickness, toedown, or loss of soil foundation around the stones (referred to as undermining or piping).  Hydraulic factors affecting riprap include velocity, current direction and eddy action.  Filters can be damaged and lead to piping, slumping or scour beneath riprap.  Riprap may fail if channel bank or invert slopes are steepened, causing instability, stone movement and bank failure.  Riprap stones are jointly used with derrick stones downstream of high-velocity flow exit locations (downstream of a large drop or outflow storm drain).  Riprap may fail due to insufficient tieback into ground surface, resulting in gullying along the edge of the riprap.  Riprap may become disintegrated from the designated protection elements due to soil-erosion.

Potential Maintenance Needs and Activities Riprap stones shall be checked regularly and after every major storm for displaced stones and slumping and erosion at the edges, especially at the bank toes and downstream of the invert control structures. If the riprap has been damaged, it shall be repaired immediately, before further damage can take place. Any new scour holes formed which have the potential to expand shall be filled with plain riprap stones to reduce the scour process. Any significant deviation(s) in riprap placement shall be reported immediately to the Senior Park Ranger at General Thomas F. Riley Wilderness Park. 3.8 Derrick Stones Key Function Derrick stones are extra-large stones, typically defined as being large enough to require placement by machine (typically 48 inches or greater in diameter). Derrick stone revetments serve to protect the most vulnerable portions of the stream. Within the WWCRP, derrick stones function as energy dissipaters or flow deflectors (away from the bank) and are to be placed downstream of major drops or along the bank toes. When placed properly, derrick stones can also be used to form longitudinal dikes along the scoured bank, protect new plants along the toe against scour, or deflect flow current away from the banks. Similar to large riprap stones, the derrick stones will require gravel and small rock filter layers over the compacted soils to function properly.

15 Wagon Wheel Creek Restoration Plan Maintenance Program

All derrick stone material and placement shall conform to Orange County Public Works Standard Plan 1809 (Special Provisions - Stonework).

Potential Issues of Concern  Local scour may be developed at the stone edges where hard surface joins soils.  Stones may be disintegrated from the designated protection elements due to soil erosion.  Stones may be dislodged, resulting in the movement of stones and downstream erosion.  Underlying rock filter is damaged or missing.  Debris becomes lodged within stones, potentially altering stream flow and leading to either sediment deposition or erosion.

Potential Maintenance Needs and Activities Any improper placement of the stones may cause additional local scour and require modification. Any signs of disintegration of stones and/or filters must be repaired or replaced. Any significant difference compared to design and initial construction shall be reported to the Senior Park Ranger at General Thomas F. Riley Wilderness Park. 3.9 Grouted Riprap Key Function Grouted riprap is simply a riprap stone bed or layer where the upper surface is enforced with grout. Grouted riprap provides erosion protection against high velocities on steep slopes and at flow impingement points, if it is designed and constructed with sufficient toedown depth.

All riprap and grout material placement shall conform to Orange County Public Works Standard Plan 1809 (Special Provisions - Stonework).

Potential Issues of Concern The potential problems for grouted riprap stones are the same as for plain riprap stones stated in Section 3.7 except that the primary factor of concern for grouted riprap is the disintegration of the concrete grout due to undersized riprap stones being insufficient for preventing the erosion force. Even if properly constructed and with the correct method of grout penetration, riprap can be damaged due to erosion of the adjacent banks or creek bed. Proper toedown and bank tie-in are most critical for grouted riprap.

Potential Maintenance Needs and Activities The maintenance needs and activities are similar to those for plain riprap stones as stated in Section 3.7. In addition, grout is the element used to strengthen the rock layer against high velocity erosion which must be maintained according to proper design specifications. Any significant difference compared to design and initial construction shall be reported to the Senior Park Ranger at General Thomas F. Riley Wilderness Park.

16 Wagon Wheel Creek Restoration Plan Maintenance Program 3.10 Lateral Storm Drain Flow Control Key Function Within the WWCRP, lateral drains are concrete watercourses originating outside of the project area that have been designed to convey stormwater and other urban runoff into Wagon Wheel Creek. Lateral flow may also include sheet flow entering the channel from the overbank areas. Uncontrolled lateral flows were identified by WRC as a primary cause of critical bank erosion in foliage.

The Area 7 improvements include a controlled ‘concrete weir’ at the intersection of Wagon Wheel Canyon Trail and the Oso Parkway storm drain. This weir is intended to direct low flow from the lateral drain under the weir and trail via seepage. The concrete weir is to be protected by riprap stones at the outlet along the bank

For Area 8, lateral flow is to be controlled by confining the existing concrete ditch flow with the addition of an earthen berm. This integrity of this berm is crucial to the overall function of Area 8 and must remain compacted with sufficient erosion protection on both sides.

Potential Issues of Concern  Concrete may be damaged, which may either reduce flow capacity or lead to seepage.  The drain may become clogged with debris or sediment.  The drain may experience excessive flow exceeding its design capacity and experience overflow.  In Area 7, the integrity of the riprap along the concrete weir must be maintained in order to prevent erosion.  Excessive sediment in Area 7 could block seepage from the lateral drain into perforated pipes, resulting in unintended sheet flow over the trail/access road.  Perforated pipes may be damaged or clogged with sediment or debris.

Potential Maintenance Needs and Activities Inspect and maintain all concrete, earthen berms, riprap and derrick stones, seepage gravels and pipes, plantings and seeding for the elements stated above.

 Inspect to ensure that concrete is in good repair with no evident cracks or deficiencies.  Remove any debris that may have settled within the drain.  Remove any sediment that has been deposited within the drain.

Any significant difference compared to the design and initial construction should be reported to the Senior Park Ranger at General Thomas F. Riley Wilderness Park. 3.11 Sediment Control Key Function Sediment control is mainly applied in Areas 6 and 7, which involve flow conveyance. Area 6 has sedimentation potential near the entrance road, and Area 7 has a potential for siltation within the gravel seepage path upstream and under the concrete weir at the trail crossing.

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Potential Issues of Concern The sedimentation problem in Area 6 near the entrance road is expected to be improved but not eliminated entirely due to hydraulic expansion in this area; a new process of erosion and sedimentation may occur prior to stabilization.

Siltation may block the seepage path in Area 7, resulting in undesirable low flow passage over the trail surface during dry weather.

Potential Maintenance Needs and Activities The Area 6 entrance road culvert and Area 7 gravel pads and perforated pipes must be maintained free of debris and sediments. The adjacent channel must be maintained to allow for the intended flow conveyance. Any significant deviation(s) in erosion or sedimentation shall be reported immediately to the Senior Park Ranger at General Thomas F. Riley Wilderness Park. 3.12 Debris Control Key Function Maintenance is a vital component in how a debris control countermeasure would function at a drainage structure. The lack of maintenance can cause improper functioning of the structure, resulting in possible damage to or failure of the structure. The general maintenance practices of these structures should involve regular inspections and cleaning coupled with emergency removal of debris. Regular periodic inspections allow minor problems to be discovered and corrected before they become serious.

Any debris that alters the flow of water within the creek (either direction or velocity) and has the potential to increase the likelihood of sedimentation or erosion must be removed. Specifically, the introduction of soft debris (e.g., leaves) into the channel promotes sedimentation, while the presence of rigid debris (e.g., a fallen tree) will deflect flow and potentially create a scour hole or generate bank erosion. These altered flows will impact downstream erosion.

Potential Issues of Concern  Local scour due to flow obstruction and constriction often results from debris accumulation.  The remaining scour holes will need to be inspected frequently to ensure that riverbed restoration is naturally progressing by fill.  Woody debris removed may be placed in noncritical erosion areas where loose riprap and planting are to provide additional bank protection. Any debris removed should be disposed of in an acceptable fashion. Debris should not be placed where it may be carried away by the stream flow or where it may block the flow.  Debris control will need to address disposal and fill in scour holes.

18 Wagon Wheel Creek Restoration Plan Maintenance Program

Potential Maintenance Needs and Activities Woody debris and other vegetative debris must be maintained in order to prevent scour problems in the channel. Debris logs or root wads may be treated and realigned to serve as bioengineering erosion control measures. This must be applied carefully in conjunction with other erosion control materials under the supervision of experienced engineers or contractors. Trash debris, when encountered during inspection, shall be removed in an effort to comply with the Orange County NPDES requirements. Any debris issues which may cause significant local scour of creek bed or banks shall be reported immediately to the Senior Park Ranger at General Thomas F. Riley Wilderness Park for direction. 3.13 Minor Structures 3.13.1 Earthen Berms Key Function Earthen berms such as those used in Areas 6 and 8 are designed to intercept and divert concentrated runoff away from the face of a slope or streambank. In addition to protecting the face of a streambank from overbank runoff, diversions may also improve general slope stability by preventing runoff from infiltrating into and saturating the bank.

Potential Issues of Concern Berms must always be compacted to prevent loose soil from washing away. Rain and rodent damage are factors which could loosen the soils.

The earthen berms must be maintained at desired grade elevations to ensure their function to confine flow in the concrete ditch and in the desired direction. Overflows will occur at low elevations of the berms resulting from uneven composition or erosion failure. The overflow could cause instability of the slope and failure of the outer berm as well as continued bank erosion and widening in Area 8.

Vegetation on the berm should be maintained to stabilize the berm. Any rodent hole through the berm at ground level can result in immediate failure. Any rodent damage to the berm should be repaired immediately. In extreme cases, a rodent proof screen or barrier will have to be installed in the berm.

Potential Maintenance Needs and Activities Earthen berms must be maintained routinely for proper performance, with special attention after severe storms. Any significant stability issues with the berms shall be reported immediately to the Senior Park Ranger at General Thomas F. Riley Wilderness Park.

3.13.2 Culverts for Creek Crossing Key Function The proposed reinforced culvert under the entrance road in Area 6 is designed for the efficient conveyance of water flow and to reduce previous sedimentation issues. Other creek crossings include those under the Pedestrian Bridge, Vela Court and Sandy Knoll.

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Potential Issues of Concern The culvert bottom may become silted during heavy rain and suffer from debris jams. The structure can also become unstable and fail due to creek bed scour and/or bank erosion.

Potential Maintenance Needs and Activities Proper culvert opening conditions must be maintained in order to convey the flows and reduce flooding and sedimentation. Proper foundation stability must be maintained by inspecting for signs of erosion and debris blockage surrounding the structure. Any significant erosion or sedimentation issues found at the culverts built for drainage crossing which may affect the creek capacity, bank stability or culvert structural integrity shall be reported to the Senior Park Ranger at General Thomas F. Riley Wilderness Park.

3.13.3 Outlet Protection (Not Part of WWCRP) Key Function There are a few lateral drain outlets along Wagon Wheel Creek which do not have proper outlet protection. These may affect creek stability at the confluence locations and cause structural failure. To prevent scour and undermining, the outlet stabilization structure must absorb the impact of the flow and reduce the velocity to non- erosive levels. Riprap applied to the bottoms and banks can reduce the erosion risk.

Potential Issues of Concern Assuming proper design and construction, there is still a potential for riprap pad erosion due to the nature of high flow existing from upstream culverts. This is especially true when the flow outlet invert is much higher than the receiving channel invert and a ‘drop’ or ‘spillway’ condition develops. It is necessary to place riprap or derrick stone pads and add bank protection.

Potential Maintenance Needs and Activities Riprap or derrick stone outlet and bank protection should be routinely checked in order to maintain the designed coverage area and to ensure the integrity of the stone pad. Additional stones must be placed per plans, if missing. The outlet stone pad may require reconstruction if it has disintegrated. The filtering layer may be fabric or gravel, and it should be placed under the stone to avoid undermining. Any significant erosion or sedimentation issues found at the drain outlets which may affect the creek stability shall be reported to the Senior Park Ranger at General Thomas F. Riley Wilderness Park. Section 4 - Work Periods, Frequencies, Sequences and Accesses 4.1 General Requirements Encroachment The WWCRP is largely located within the General Thomas F. Riley Wilderness Park property boundaries as shown in Figure 1. Any encroachment agreements for areas outside of the park boundaries shall be obtained by OC Parks and maintained on file.

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Environmental Compliance Although the WWCRP is beneficial to the overall ecology and water quality of Wagon Wheel Creek, the project implementation and maintenance activities are required to follow environmental regulations. Since Wagon Wheel Creek involves wetlands, riparian plants, native plants and other habitats, any maintenance activities shall be performed in compliance with the conditions and requirements of all applicable regulatory permits. Wagon Wheel Creek is part of the Trabuco Creek/San Juan Creek watershed, and the maintenance activities are subject to the NPDES and regulatory permit conditions specific to the area. It is recommended that a summary and interpretation of these requirements relating to creek maintenance be prepared by the NPDES coordinator and environmental consultant and placed as a reference to this maintenance manual. Those requirements supersede the information presented in this maintenance program when conflicts occur or permit conditions are updated.

Flood and Erosion Safety As a natural drainage system, Wagon Wheel Creek is subject to flooding and subsequent sediment movement during wet seasons; weather conditions and access safety must be reviewed prior to conducting any inspection and maintenance. Areas of uncertainty and higher risk, such as areas with steep, wet and/or uncompacted banks and areas where the channel bottom is covered by debris or mud should be avoided. In these instances, inspection and maintenance access shall be rerouted through stable areas. Risk taking must be avoided at all times, including during post flood periods.

Routine Inspection The foundation of proper maintenance of the existing conditions and the WWCRP components lies in routine inspection. All improvement areas shall be inspected frequently according to their assigned priority and recommendations as provided in Sections 4.2, 4.3 and 4.4. Routine inspections shall take place prior to any forecast rainfall, immediately following each significant rainfall, whenever conditions pose a threat to safety or to the integrity of improvements, and when directed by OC Parks management. Section 5 provides detailed lists for each WWCRP implementation area.

All maintenance personnel should be aware of and maintain a safe distance from unstable banks subject to subsurface seepage or where erosion may occur due to excessive bank height or steepness.

Maintenance Work Any major maintenance activity occurring in the channel (including sediment removal and bank stabilization) are preferred to occur within the dry and low‐flow period, typically between May 1 and October 31. Exceptions may be made for emergencies or on a project‐by‐project basis with advance approval of the OC Parks management team and in compliance with the permit conditions. This is especially true in dry years, when no threat from flooding is expected. Inspections and maintenance activities which do not present safety concerns or involve ground and/or habitat disturbance may be allowed to occur year round. Non ground‐disturbing work on the upper banks of stream channels (e.g., vegetation, road and v‐ditch maintenance) may also be conducted year round.

Non ground-disturbing work (vegetation thinning/pruning) may be conducted in the channel beyond the primary maintenance work window of May 1 to October 31 if the channel is relatively dry and if it is determined to be necessary by OC Parks. Once the first significant rainfall event has been forecasted, all in‐channel equipment,

21 Wagon Wheel Creek Restoration Plan Maintenance Program stock piles and/or temporary diversion devices shall be removed. Exposed soils in the upper banks or outside of the banks in the maintenance area must be protected against erosion, either by temporary covers or by being stabilized via hydroseeding prior to the rain, in accordance with NPDES requirements.

The following paragraphs describe typical maintenance work expected of the proposed WWCRP improvements and the preferred time periods for performing such work.

. Invert Stabilization Invert stabilization (or invert control) measures are critical components of the WWRCP and require attention. These include riprap and derrick stone drop structures, grade control stabilizers, check dams, and sheet pile drop. In Wagon Wheel Creek, the existing ArmorFlex to be reinforced in Area 2 was also considered as an invert stabilizer; as it was placed to protect a mild drop in this reach. In addition, the existing invert stabilizers, such as those placed immediately downstream of Vela Court, which are not a part of the improvements recommended in the WWCRP but are included in the extended maintenance boundaries for Area 2.

Inspection and maintenance for invert stabilization should address the stability of the stabilizer itself as well as the erosion control materials surrounding the stabilizer such as vegetative covers, riprap and derrick stones. If new scour holes develop within the inspection area that may affect the stability of the improvements, additional invert controls are to be placed at strategic locations determined by technical evaluation and design.

Invert stabilization activities are preferred to be conducted from May 1 to October 31, when Wagon Wheel Creek is relatively dry. Caution must be taken when work is performed near steep reaches, invert drops, or channel bottoms inundated by loose debris.

. Bank Stabilization Maintenance activities related to bank stabilization are limited to (1) maintaining the elements stated in the WWCRP where the bank protection measure is an extended part of the invert control (grade control, drop structure, check dam, or sheet pile), (2) maintaining the loose riprap or derrick stones along the toe of the slope for diverting flow and reducing flow impingement and (3) maintaining the existing bank protection. It should be noted that the WWCRP does not include reconstruction of most failed or unstable banks, especially those steep and high banks in Areas 7, 8 and 9 (see Section 1). Planting is part of the bank stabilization in WWCRP and is described under ‘Vegetation Management’.

Bank stabilization activities are preferred to be conducted from May 1 to October 31, when Wagon Wheel Creek is relatively dry. Work may be extended beyond this period, if permitted, with caution. Caution must be taken when work is performed near steep, wet or high bank areas.

. General In-Channel Maintenance General maintenance activities within the creek bed typically include the realignment or replacement of loose riprap stones, the removal of trash, debris and interfering sediment, and the removal or clearance of vegetation or other significant flow obstructions. The need for removal of vegetative debris will be

22 Wagon Wheel Creek Restoration Plan Maintenance Program

evaluated based on site‐specific conditions, such as whether the debris is deflecting flow toward the stream bank or could trap additional debris or generate additional scour.

The channel shall be inspected after each significant rainfall. It is, however, recommended that general channel maintenance work be performed only as needed to control low flow (away from the banks), prevent flooding (due to flow blockage) and avoid local erosion and habitat loss (due to scour at fallen tree trunks). When performing inspections and maintenance work, only designated points of access are to be used in order to ensure safety and to prevent additional disturbance to the natural habitat.

. Vegetation Management Vegetation management refers to the planting, irrigation and maintenance of new trees and other vegetation, and the trimming and/or removal of potentially problematic vegetation within the creek bed or along its banks. Vegetation management occurs on different schedules depending on the type and location of the activity to be conducted. Vegetation management activities and general periods of implementation are shown below.

 Vegetation pruning and removal on the lower bank and in the creek bed – May 1 to October 31 (with the potential for an extension dependent upon dry conditions and OC Parks management notification and approval).  Non ground-breaking vegetation maintenance on upper banks of stream – All year.  Riparian planting and/or transplanting – Per biologist’s specifications.  Planting, pruning and removal, and access road clearing – All year.  Nursery stock tree planting – December 1 to May 31.  Mowing (if applicable, including along access roads) – All year.

As stated previously, plant establishment is an important part of the restoration plan. In addition to the inspection and maintenance work to be performed by OC Parks, the contractor is typically required to conduct monitoring and maintenance of vegetation within each of the construction areas during the first year after construction. Vegetation management must be sensitive to habitat and bank stability conditions. Any removal of the existing invasive or non-native plants which provide creek stabilization function to the creek must accompany a plan of temporary erosion control prior to the expected establishment of the replaced riparian plants.

Access Road/Trail Maintenance Access road maintenance may include grading, decomposed granite resurfacing, and/or vegetation removal. Access road maintenance work may involve hand tools or mechanized equipment.

The potential timing for access road/trail maintenance activities is:  Road repairs, grading and/or resurfacing – All year.  Pruning of overhead vegetation – All year.  Spraying of dirt/gravel access roads – March 1 to April 30.  Transitional area maintenance – March 1 to October 31.

23 Wagon Wheel Creek Restoration Plan Maintenance Program 4.2 High Priority Areas High Priority has been given to those areas where, without the implementation of proposed improvements, the potential for the failure of a large channel reach during storm events is high. Inspection for High Priority Areas is mainly recommended to ensure plant growth and creek stability and to save the initial investment of WWCRP during and after implementation. Refer to WWCRP for locations and descriptions of the improvements. Maintenance and access points are shown in Figures in Appendix A.

4.2.1 Sheet Pile No. 1 (Area 1) Area 1, Sheet Pile No. 1 (Figure 2 of WWCRP) is located at the project’s downstream limit, Section 1028, immediately upstream of the channel bend where the creek joins Cañada Gobernadora. Improvements to this invert stabilization structure are extremely important and have been determined to be of high priority. The failure of this sheet pile serving as invert control could result in severe headcut erosion of the upstream channel and damage to several grade control structures and bridge crossings. Improvements include sheet pile reinforcement with additional stabilization by riprap bank protection, riparian planting, and loose derrick and riprap stones downstream of the control structures.

Ongoing maintenance activities associated with Area 1 will include invert control, in-channel maintenance, bank stabilization, vegetation management, and trail/access road maintenance.

Specific inspection guidance for Area 1 is provided in Appendix B.

Work Period The following time periods are recommended for the various activities at various locations in this reach.

In-Channel Maintenance – Following significant rainfall.

Bank Stabilization – May 1 to October 31.

Vegetation Management  Vegetation pruning and removal on the lower bank and in the creek bed – May 1 to October 31 (with the potential for an extension dependent upon dry conditions and OC Parks management notification and approval).  Non ground-breaking vegetation maintenance on upper banks of stream – All year.  Riparian planting and/or transplanting – Per biologist’s specifications.  Planting, pruning and removal, and access road clearing – All year.  Nursery stock tree planting –December 1 to May 31.  Mowing (if applicable, including along access roads) – All year.

Trail/Access Road Maintenance  Road repairs, grading, and/or resurfacing – All year.  Access road pruning – All year.

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Frequency For the first three years following construction, inspections for Area 1 are to take place at the beginning and end of each rainy season as well as prior to and following all storm events totaling 0.5” or more of precipitation within any 3-hour period.

In the fourth year following construction and in all subsequent years, Area 1 inspections are to take place at the beginning of each rainy season and before and after each storm events totaling 0.5” or more of precipitation within any 3-hour period.

Sequence and Access As a general rule, it is preferable to inspect and maintain the creek improvements in sequence from downstream to upstream due to headcut erosion concerns. As stated previously, the WWCRP is highly dependent on invert stabilization, and maintaining Sheet Pile No. 1 offers the benefits of reducing headcut erosion and providing for overall stabilization of the creek.

Inspection efforts can be initiated at Area 1 (Sheet Pile No. 1). Accessibility to Area 1 is good. Primary access should be gained from the maintenance road to the east of Wagon Wheel Creek or the maintenance yard via Lyra Way in Coto de Caza. Upon the completion of the Area 1 inspection, inspection should proceed upstream to the next high priority area, Area 7 (Oso Creek Culvert).

In the event that maintenance within Area 1 requires the use of heavy equipment, access can be gained via the location shown in Figure A.1. The existing maintenance road is sufficient to provide heavy equipment access into the channel.

4.2.2 Oso Parkway Culvert (Area 7) Area 7 is located downstream of Section 8270 (Figure 12 of WWCRP) and has been identified as a high priority area, as the bank and trail have been eroded. The objective for the improvements to Area 7 is to resolve the existing trail damage issue and loss of mature oak trees by controlling and safely conveying the lateral flow from the Oso Parkway culvert through the trail crossing and to provide erosion control at the outlet.

Specific inspection guidance for Area 7 is provided in Appendix B.

Work Period The following time periods are recommended for various activities at various locations in this reach.

In-channel maintenance – Following significant rainfall. Bank Stabilization – May 1 to October 31. Vegetation Management  Vegetation pruning and removal on the lower bank and in the creek bed – May 1 to October 31 (with the potential for an extension dependent upon dry conditions and OC Parks management notification and approval).  Non ground-breaking vegetation maintenance on upper banks of stream – All year.

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 Riparian planting and/or transplanting – Per biologist’s specifications.  Planting, pruning and removal, and access road clearing – All year.  Nursery stock tree planting – December 1 to May 31.  Mowing (if applicable, including along access roads) – All year. Trail/Access Road Maintenance  Road repairs, grading, and/or resurfacing – All year.  Access road pruning – All year. General Park Amenities  Fencing – All year.  Trail signage – All year.

Frequency For the first three years following construction, inspections for Area 7 are to take place at the beginning and end of each rainy season as well as prior to and following all storm events totaling 0.5” or more of precipitation within any 3-hour period.

In the fourth year following construction and in all subsequent years, Area 7 inspections are to take place at the beginning of each rainy season and before and after all storm events totaling 0.5” or more of precipitation within any 3-hour period.

Sequence and Access Area 7 is accessible via the Wagon Wheel Canyon Trail/access road. Inspection of Area 7 is independent of the in- stream activities and may be inspected immediately following the inspection of Area 1 prior to inspection of the entrenched sections, Area 8 and Area 9.

If maintenance within Area 7 should require the use of heavy equipment, access is to be gained via the location shown in Figure A.9. The existing trail/maintenance road should be sufficient to provide most heavy equipment access into the channel. Additional access to the lower elevations can be gained with the construction of a ramp similar to those shown as Detail 1 in Figure A.14.

4.2.3 Entrenched Sections (Downstream & Upstream of Area 7) The area upstream and downstream of Area 7 is located between Sections 7461 and 8843 (Figure 10 of WWCRP) This area is categorized as high priority, as invert stabilization is essential in order to reduce bank sloughing due to continuous invert lowering and to prevent further headcut erosion toward the problematic Areas 8 and 9. In order to accomplish these objectives, a series of invert stabilizers (grade-control and drop structures, referred to as check dams in WWCRP) are to be placed in strategic locations. Common to all areas, invert stabilization inspection and maintenance should include all ancillary measures such as low bank protection, riparian planting, local scour protection downstream of each structure (derrick and/or riprap stones), and extra toedown and grout on the downstream face of each control structure.

Specific inspection guidance for Downstream & Upstream of Area 7 is provided in Appendix B.

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Work Period The following time periods are recommended for various activities at various locations in this reach.

In-channel maintenance – Following significant rainfall. Bank Stabilization – May 1 to October 31. Vegetation Management  Vegetation pruning and removal on the lower bank and in the creek bed – May 1 to October 31 (with the potential for an extension dependent upon dry conditions and OC Parks management notification and approval).  Non ground-breaking vegetation maintenance on upper banks of stream – All year.  Riparian planting and/or transplanting – Per biologist’s specifications.  Planting, pruning and removal, and access road clearing – All year.  Nursery stock tree planting – December 1 to May 31.  Mowing (if applicable, including along access roads) – All year.

Trail/Access Road Maintenance  Road repairs, grading, and/or resurfacing – All year.  Access road pruning – All year.

Frequency For the first three years following construction, inspections for the Entrenched Sections are to take place at the beginning and end of each rainy season as well as prior to and following all storm events totaling 0.5” or more of precipitation within any 3-hour period.

In the fourth year following construction and in all subsequent years, inspections for the Entrenched Sections are to take place at the beginning of each rainy season and before and after all storm events totaling 0.5” or more of precipitation within any 3-hour period.

Sequence and Access As a general rule, all inspections within the project should be initiated at the farthest downstream improvement and proceed upstream. WWCRP is highly dependent on invert stabilization. Maintaining invert stabilization in this reach offers the benefits of reducing headcut erosion and preventing further degradation of Areas 8 and 9.

Accessibility to this location is limited. Inspections and maintenance can be conducted along the channel bottom via the access from the Pheasant Run Trail. Once access to the channel is gained, inspection can be performed from downstream (Section 7461) to upstream (Section 8843). Upon the completion of the inspection of the Entrenched Sections, the inspector can remain in the channel and proceed upstream for inspection of Area 8.

If maintenance within the Entrenched Sections should require the use of heavy equipment, access is to be gained via the locations identified in Figure A.10. Access ramp construction will vary depending upon the location and may be constructed using the examples shown as Detail 2 or Detail 3 (Figures A.15 and A.16). Since the bank height in the upper sections is excessive and exceeds 20 feet, Detail 3 may be used for access.

27 Wagon Wheel Creek Restoration Plan Maintenance Program

4.2.4 Wide Area Sections (Area 8) Area 8 (Figures 13, 13a, and 14-16 of WWCRP) is characterized by predominantly clayey soils and extremely steep and high banks. Overflow from the nearby concrete ditch has produced sheet flows into the easterly bank and has contributed to bank failure. Bank sloughing has encroached Wagon Wheel Canyon Trail and has created a potential hazard to trail users. This area has been entrenched and widened with extremely high, erosive banks.

Improvements in Area 8 include earthen berm construction and the relocation of Wagon Wheel Canyon Trail in order to confine the ditch flow. Additionally, toe erosion control and bank hydroseeding are provided without engineering of the failed banks. Continued bank erosion is anticipated, with the eroded materials expected to cover the stones along the toe and recreate natural benches for vegetation growth. Within the channel, bands of riparian vegetation are to be created to span the extensively widened and degraded creek in order to restore stream geomorphology and in-stream ecology. This phased, bioengineering approach is designed to promote natural creek restoration and bank stabilization (Figures 13 to 16 of WWCRP) by providing toe erosion control and increasing favorable hydraulic and sediment transport conditions. Protecting this widened reach against further bank erosion is critical and, therefore, inspection and maintenance within Area 8 is considered a high priority.

Specific inspection guidelines for Area 8 are provided in Appendix B.

Work Period The following time periods are recommended for various activities at various locations in this reach.

In-Channel Maintenance  Riprap – Following significant rainfall.  Rock islands – Following significant rainfall.  Woody debris – All year.  Vegetation – All year.  Bank Stabilization – May 1 to October 31.

Vegetation Management  Vegetation pruning and removal on the lower bank and in the creek bed – May 1 to October 31 (with the potential for an extension dependent upon dry conditions and OC Parks management notification and approval).  Tree planting, relocating, and/or transplanting – all year (Note: The second phase may require the replenishment of riparian seeding and planting species according to Table 4).  Non ground-breaking vegetation maintenance on upper banks of stream – All year.  Riparian planting and/or transplanting – Per biologist’s specifications.  Planting, pruning and removal, and access road clearing – All year.  Nursery stock tree planting – December 1 to May 31.  Mowing (if applicable, including along access roads) – All year.  Berm Maintenance – All year.

28 Wagon Wheel Creek Restoration Plan Maintenance Program

Trail/Access Road Maintenance  Road repairs, grading, and/or resurfacing – All year.  Access road pruning – All year.

General Park Amenities.  Rail Safety Fencing – All year.  Trail signage – All year.

Frequency For the first three years following construction, inspections for Area 8 are to take place at the beginning and end of each rainy season as well as prior to and following all storm events totaling 0.5” or more of precipitation within any 3-hour period.

In the fourth year following construction and in all subsequent years, Area 8 inspections are to take place at the beginning of each rainy season and before and after all storm events totaling 0.5” or more of precipitation within any 3-hour period.

Sequence and Access For inspections and routine maintenance, accessibility to the in-stream portion of Area 8 is extremely limited and is best gained by proceeding upstream within the channel from the ‘Entrenched Section’ reach or downstream from the lower reach of Area 9. Inspection and maintenance for the fencing, berm and ditch can be conducted via the Wagon Wheel Canyon Trail/access road. Since these upper bank components are critical to keeping the concrete ditch overflow from eroding the bank and park users from accessing the unsafe bank, these can be performed more frequently with other park maintenance efforts.

If maintenance within Area 8 should require the use of heavy equipment, access is to be gained via the locations identified in Figure A.11, and the access ramp may be constructed using the example shown as Detail 3 in Figure A.16. Construction of accesses through unstable high banks within this reach is not recommended.

4.2.5 Downstream of Pedestrian Bridge (Area 9) and Upstream of Pedestrian Bridge (Area 9B) Located between Sections 9320 and the Pedestrian Bridge that crosses the creek near Kingfisher Court (upstream of Section 9711), this reach features steep grades, large invert drops and the massively bedded Sespe Formation, which is characterized by fine- to medium-grained silty sandstone. The creek bed has experienced significant scour within the exposed sandstone since this project started in 2011.

The stability of this channel reach as well as the reach further upstream highly depends on the control of the elevation near Section 9449. This is the most critical improvement needed to stabilize Wagon Wheel Creek upstream of the Wide Area Sections. The proposed improvements are intended to stabilize the invert with riparian planting along the slope toe and a series of drop structures (riprap, grouted riprap, derrick stone and/or sheet pile drop structures) as shown in Figure 17 of the WWCRP. The invert control is to be reinforced by additional stabilization including riprap bank protection, riparian planting, extra toedown, and grouted surface on the downslope

29 Wagon Wheel Creek Restoration Plan Maintenance Program face of the drop, as well as loose derrick and riprap stones forming energy dissipaters and toe protection upstream and downstream of the control structures.

This reach, near and upstream of Section 9449, must be maintained following the final design and construction to provide an integral system of protection against headcut erosion, severe downcutting and associated damages. The current stability remaining in some sections within this reach which have been afforded by the sandstone layers must be inspected, and any degradation due to future storm damage must be noted for further actions. Additionally, the eroded, entrenched sections such as those located between Area 8 and Section 9449 could become enlarged and cause severe bank erosion hazards similar to those observed in Area 8. Inspection and maintenance of the improvements within this area is an extremely high priority and must be performed thoroughly and carefully.

Because of the instability problems associated with Area 9 and newly occurring erosion occurring in the reach upstream of Area 9, the inspection and maintenance boundary for Area 9 (Figure A.12) has been extended from the pedestrian bridge to Section 11180, which is referred to as Area 9B, as shown in Figure A.12.2. This area may not have urgent needs for improvements but will require continued monitoring. Within this area, minor drops have formed at approximately 500 feet and 1,100 feet upstream of the pedestrian bridge. Additionally, erosion has occurred immediately upstream of the bridge near the concrete spillway and lateral drain outflow (from the detention basin built for residential development located on and near Kingfisher Court).

Specific inspection guidance for Area 9 is provided in Appendix B.

Work Period The following time periods are recommended for various activities at various locations in this reach.

In-Channel Maintenance  Grouted Riprap – Following significant rainfall.  Sheet pile – Following significant rainfall.  Woody debris – Following significant rainfall.  Bank Stabilization – May 1 to October 31.

Vegetation Management  Vegetation pruning and removal on the lower bank and in the creek bed – May 1 to October 31 (with the potential for extension dependent upon dry conditions and OC Parks management notification and approval).  Non ground-breaking vegetation maintenance on upper banks of stream – All year.  Riparian planting and/or transplanting – Per biologist’s specifications.  Planting, pruning and removal, and access road clearing – All year.  Nursery stock tree planting – December 1 to May 31.  Mowing (if applicable, including along access roads) – All year.

30 Wagon Wheel Creek Restoration Plan Maintenance Program

Trail/Access Road Maintenance  Road repairs, grading, and/or resurfacing – All year.  Access road pruning – All year.  General Park Amenities – All year.  Trail signage – All year.

Frequency For the first three years following construction, inspections for Area 9 are to take place at the beginning and end of each rainy season as well as prior to and following all storm events totaling 0.5” or more of precipitation within any 3-hour period.

In the fourth year following construction and in all subsequent years, Area 9 inspections are to take place at the beginning of each rainy season and before and after all storm events totaling 0.5” or more of precipitation within any 3-hour period.

Sequence and Access As stated previously, the WWCRP is highly dependent on invert stabilization. Maintaining invert stabilization in this reach is critical to reducing headcut erosion and providing overall stabilization for the upper reaches, including the upstream bridge and utility crossing.

For inspections and routine maintenance, accessibility to the upper portion of Area 9 upstream or the existing major invert drop is good. Access can be gained from the west bank at the Pedestrian Bridge or from the east bank upstream of Section 9504. Downstream of the drop, Area 9 should be accessed from the Area 8 channel reach.

If maintenance within Area 9 should require the use of heavy equipment, access is to be gained via the locations identified in Figure A.12. The access ramp may be constructed using the examples shown as Detail 1 in Figure A.14 for the upper portion of Area 9 or as Detail 3 in Figure A.16 for the lower reach of Area 9. Any unnecessary disturbance to the unstable banks downstream of the proposed sheet pile drop structures should be avoided. 4.3 Medium Priority Areas Medium Priority has been given to those areas where erosion has occurred and damage has been observed, or where there may be future erosion concerns due to high flow velocities without improvements. Refer to the WWCRP for locations and descriptions. Maintenance and access points are shown on Figures in Appendix A.

4.3.1 ArmorFlex Area (Area 2) Area 2 is located between Sections 1706 and 1750. Improvements to reinforce the existing ArmorFlex blanket by adding additional toe-down and riprap protection are intended to prevent scouring outside of the existing ArmorFlex area, which may undermine the ArmorFlex pad and cause headcut erosion. Loose riprap/rocks will be placed on both upstream and downstream sides to a minimum depth of six feet, and riparian planting along the

31 Wagon Wheel Creek Restoration Plan Maintenance Program channel banks will create added stability. Improvement to Area 2 (Figure 3 of WWCRP) is determined to have a medium priority due to the potential erosion and loss of invert control which may impact other structures.

Specific inspection guidance for Area 2 is provided in Appendix B.

Work Period The following time periods are recommended for various activities at various locations in this reach.

In-Channel Maintenance – May 1 to October 31. Bank Stabilization – May 1 to October 31. Vegetation Management  Vegetation pruning and removal on the lower bank and in the creek bed – May 1 to October 31 (with the potential for extension dependent upon dry conditions and OC Parks management notification and approval).  Non ground-breaking vegetation maintenance on upper banks of stream – All year.  Riparian planting and/or transplanting – Per biologist’s specifications.  Planting, pruning and removal, and access road clearing – All year.  Nursery stock tree planting – December 1 to May 31.  Mowing (if applicable, including along access roads) – All year.  Trail/Access Road Maintenance – All year.  General Park Amenities – All year.

Frequency For the first two years following construction, inspections for Area 2 are to take place at the beginning and end of each rainy season as well as prior to and following all storm events totaling 0.5” or more of precipitation within any 3-hour period.

In the third year following construction and in all subsequent years, Area 2 inspections are to take place at the beginning of each rainy season and before and after all storm events totaling 0.5” or more of precipitation within any 3-hour period.

Sequence and Access As a general rule, inspection and maintenance of the medium priority areas may proceed from Area 2 to the upstream areas. Maintaining invert stabilization in Area 2 offers the benefits of reducing headcut erosion and providing some stabilization for upstream reaches, including the high priority areas.

Access to Area 2 is good via the trail/maintenance roads. After inspection, the inspector will proceed to the next upstream medium priority area, Area 4 (Downstream of Vela Court).

If maintenance within Area 2 should require the use of heavy equipment, access is to be gained via the location shown in Figure A.2, and the access ramp may be constructed using the example shown as Detail 1 in Figure A.14.

32 Wagon Wheel Creek Restoration Plan Maintenance Program

4.3.2 Downstream of Vela Court (Area 4) Area 4 (Figure 6 of WWCRP) is located downstream of Vela Court between Sections 2578 and 2625. The improvements include invert stabilizers to enhance the existing stability. Riparian planting on channel banks will provide additional bank stabilization and help reduce flow velocity.

Specific inspection guidance for Area 4 is provided in Appendix B.

Work Period The following time periods are recommended for various activities at various locations in this reach.

In-Channel Maintenance – May 1 to October 31. Bank Stabilization – May 1 to October 31. Vegetation Management  Vegetation pruning and removal on the lower bank and in the creek bed – May 1 to October 31 (with the potential for an extension dependent upon dry conditions and OC Parks management notification and approval).  Non ground-breaking vegetation maintenance on upper banks of stream – All year.  Riparian planting and/or transplanting – Per biologist’s specifications.  Planting, pruning and removal, and access road clearing – All year.  Nursery stock tree planting – December 1 to May 31.  Mowing (if applicable, including along access roads) – All year.  Trail/Access Road Maintenance – All year.  General Park Amenities – All year.

Frequency For the first two years following construction, inspections for Area 4 are to take place at the beginning and end of each rainy season as well as prior to and following all storm events totaling 0.5” or more of precipitation within any 3-hour period.

In the third year following construction and in all subsequent years, Area 4 inspections are to take place at the beginning of each rainy season and before and after all storm events totaling 0.5” or more of precipitation within any 3-hour period.

Sequence and Access Access to Area 4 is good from the trail/maintenance road. Inspection of Area 4 may follow the Area 2 inspection and proceed to the next upstream medium priority area, Area 6.

If maintenance within Area 4 should require the use of heavy equipment, access is to be gained via the location shown in Figure A.5, and the access ramp may be constructed using the example shown as Detail 1 in Figure A.14.

33 Wagon Wheel Creek Restoration Plan Maintenance Program

4.3.3 Near Park Ranger Station (Area 6) Area 6 (Figure 9 of WWCRP) refers to the reach between Sections 5710 and 6285 near the Park Ranger Station, entrance road and several park amenities, including the Park Ranger’s office trailer. The riprap stones on channel banks within this reach have been undermined, and the entrance road has been subject to flooding and sedimentation. The purpose of improvements within Area 6 is threefold: (1) to repair the damaged channel to the interim protection level, (2) to realign the low-flow channel to reduce west bank failure, and (3) to confine creek flow near the park entrance road crossing to reduce flooding and sedimentation.

Specific inspection guidance for Area 6 is provided in Appendix B.

Work Period The following time periods are recommended for various activities at various locations in this reach.

In-Channel Maintenance – May 1 to October 31. Bank Stabilization – May 1 to October 31. Vegetation Management  Vegetation pruning and removal on the lower bank and in the creek bed – May 1 to October 31 (with the potential for extension dependent upon dry conditions and OC Parks management notification and approval).  Non ground-breaking vegetation maintenance on upper banks of stream – All year.  Riparian planting and/or transplanting – Per biologist’s specifications.  Planting, pruning and removal, and access road clearing – All year.  Nursery stock tree planting – December 1 to May 31.  Mowing (if applicable, including along access roads) – All year.  Trail/Access Road Maintenance – All year.  General Park Amenities – All year.

Frequency For the first two years following construction, inspections for Area 6 are to take place at the beginning and end of each rainy season as well as prior to and following all storm events totaling 0.5” or more of precipitation within any 3-hour period.

In the third year following construction and in all subsequent years, Area 6 inspections are to take place at the beginning of each rainy season and before and after all storm events totaling 0.5” or more of precipitation within any 3-hour period.

Sequence and Access Area 6 is accessible via the entrance road. Inspection of Area 6 may take place following the inspection of Area 4 and will conclude the inspection of medium priority areas.

34 Wagon Wheel Creek Restoration Plan Maintenance Program

If maintenance within Area 6 should require the use of heavy equipment, access is to be gained via the location shown in Figure A.8, and the access ramp may be constructed using the example shown as Detail 1 in Figure A.14.

4.3.4 Stormwater Management (Area 11) Wagon Wheel Creek’s critical erosion is largely the result of urban development which has generated relatively clean water inflow (from the culvert at the Oso Parkway crossing). These clear water flows can cause erosion even with minor rainfall events (as the flow velocities on the steep drop faces can be relatively high). The improvement strategy of Area 11 (Figure 19 of WWCRP) involves managing erosion by peak reduction. Attenuation of peak discharge will enhance the opportunity of success for downstream restoration strategies relying on the stream’s self-healing process. Additionally, these improvements can enhance water quality by detention and infiltration within the wide channel and wide floodplain.

Proposed improvements within Area 11 as shown in Figure 19 of the WWCRP include the construction of a flow control berm with a pipe culvert to discharge the ponding water after the rain event and to facilitate top of bank erosion control where high flow will overtop the low bank upstream of the berm. These are proposed to utilize the large capacity of the existing wide channel in the upper reach (downstream of the Oso Parkway reinforced box culvert to the berm) and the additional storage and infiltration potentials of the wide floodplain southeast of the berm.

Inspection of Area 11 includes the in-stream detention area and overflow paths and the channel and two tributaries which will receive the overflows. Area 10 (Figure 18 of WWCRP) near Sections 11411 to 11594 is also included in the Area 11 extended inspection area (see Figure A.13). This area was previously constructed by others with gabion baskets and mattes as a retrofit to ameliorate slope erosion adjacent to the west bank developments. The gabion bank protection on the west bank has directed creek flows to the east bank, which was not properly protected, and such flow-impingement has resulted in major bank erosion. The drop structure also resulted in the formation of a downstream scour hole, which further impacted the stability of the gabion drop structure and adjacent bank stability. Although it is not part of the WWCRP, it is recommended that the area be monitored and that any progression of the erosion problem be reported for further action. No maintenance efforts by OC Parks staff are expected for this additional area unless directed by the OC Parks management.

Specific inspection guidance for Area 11 is provided in Appendix B.

Work Period The following time periods are recommended for various activities at various locations in this reach.

In-Channel Maintenance – May 1 to October 31. Bank Stabilization – May 1 to October 31. Vegetation Management  Vegetation pruning and removal on the lower bank and in the creek bed – May 1 to October 31 (with the potential for extension dependent upon dry conditions and OC Parks management notification and approval).

35 Wagon Wheel Creek Restoration Plan Maintenance Program

 Non ground-breaking vegetation maintenance on upper banks of stream – All year.  Riparian planting and/or transplanting – Per biologist’s specifications.  Planting, pruning and removal, and access road clearing – All year.  Nursery stock tree planting - December 1 to May 31.  Mowing (if applicable, including along access roads) – All year.  Trail/Access Road Maintenance – All year.  General Park Amenities – All year.

Frequency For the first two years following construction, inspections for Area 11 are to take place at the beginning and end of each rainy season as well as prior to and following all storm events totaling 0.5” or more of precipitation within any 3-hour period.

In the third year following construction and in all subsequent years, Area 11 inspections are to take place at the beginning of each rainy season and before and after all storm events totaling 0.5” or more of precipitation within any 3-hour period.

Sequence and Access Accessibility to Area 11 is good via the trail/maintenance road. Inspection of Area 11 may follow the inspection of Area 9.

If maintenance for Area 11 should require the use of heavy equipment, access is to be gained via the location shown in Figure A.13, and the access ramp may be constructed using the example shown as Detail 1 in Figure A.14. 4.4 Low Priority Areas Low priority was applied to areas where erosion is minor and manageable under the current conditions. Inspection and maintenance for improvements in these areas are done to reinforce the overall stability of the creek and prevent new erosion issues which may further deteriorate conditions in the high and medium priority areas. Maintenance and access points are shown in Figures in Appendix A.

4.4.1 Downstream of S-Turn (Sheet Pile No. 2) Sheet Pile No. 2 (Figure 4 of WWCRP) is located at Section 2020 downstream of the double U-Turn (S-Turn). The existing sheet pile is in relatively good condition and requires minimal improvements. Riparian planting is to be added along the channel banks to minimize local bank erosion.

Specific inspection guidance for Sheet Pile No. 2 is provided in Appendix B

Work Period The following time periods are recommended for various activities at various locations in this reach.

36 Wagon Wheel Creek Restoration Plan Maintenance Program

In-Channel Maintenance – May 1 to October 31. Bank Stabilization – May 1 to October 31. Vegetation Management  Vegetation pruning and removal on the lower bank and in the creek bed – May 1 to October 31 (with the potential for extension dependent upon dry conditions and OC Parks management notification and approval).  Non ground-breaking vegetation maintenance on upper banks of stream – All year.  Riparian planting and/or transplanting – Per biologist’s specifications.  Planting, pruning and removal, and access road clearing – All year.  Nursery stock tree planting – December 1 to May 31.  Mowing (if applicable, including along access roads) – All year.  Berm Maintenance – All year.  Trail/Access Road Maintenance – All year.

General Park Amenities  Rail Safety Fencing – All year.  Trail signage – All year.

Frequency For the first year following construction, inspections for needed maintenance to Sheet Pile No. 2 are to take place at the beginning and end of each rainy season as well as prior to and following all storm events totaling 0.5” or more of precipitation within any 3-hour period.

In the second year following construction and in all subsequent years, inspections of Sheet Pile No. 2 are to take place at the beginning of each rainy season and before and after all storm events totaling 0.5” or more of precipitation within any 3-hour period.

Sequence and Access As stated previously, WWCRP is highly dependent on invert stabilization. Maintaining the existing Sheet Pile No. 2 offers the benefits of reducing headcut erosion and providing stabilization for upstream reaches, including the medium and high priority areas.

Sheet Pile No. 2 is accessible via the trail upstream of the Sandy Knoll crossing. Inspections in low priority areas may follow those for medium priority areas and can be initiated at Sheet Pile No. 2 (S-Turn Area) and proceed to the next upstream low priority area, Sheet Pile No. 3 (Between Vela Court and Sandy Knoll).

If maintenance for Sheet Pile 2 should require the use of heavy equipment, access is to be gained via the location shown in Figure A.3, and the access ramp may be constructed using the example shown as Detail 1 in Figure A.14.

37 Wagon Wheel Creek Restoration Plan Maintenance Program

4.4.2 S-Turn Area (Area 3) Area 3 is located approximately 300 feet downstream of Vela Court between Sections 2290 and 2532 (Figure 5 of WWCRP). Improvements within this area are intended to strengthen channel banks, reduce flow velocities and redirect flows away from channel banks. This will be achieved by reinforcing the existing riprap along the east bank adjacent to the maintenance access road, placing new riprap along the west bank at the sharp alignment change, and providing riparian planting throughout the S-Turn Area.

Specific inspection guidance for Area 4 is provided in Appendix B.

Work Period The following time periods are recommended for various activities at various locations in this reach.

In-Channel Maintenance - May 1 to October 31. Bank Stabilization - May 1 to October 31. Vegetation Management  Vegetation pruning and removal on the lower bank and in the creek bed – May 1 to October 31 (with the potential for extension dependent upon dry conditions and OC Parks management notification and approval).  Non ground-breaking vegetation maintenance on upper banks of stream – All year.  Riparian planting and/or transplanting – Per biologist’s specifications.  Planting, pruning and removal, and access road clearing – All year.  Nursery stock tree planting - December 1 to May 31.  Mowing (if applicable, including along access roads) – All year.  Trail/Access Road Maintenance – All year.  General Park Amenities – All year.

Frequency For the first year following construction, inspections for needed maintenance within Area 3 are to take place at the beginning and end of each rainy season as well as prior to and following all storm events totaling 0.5” or more of precipitation within any 3-hour period.

In the second year following construction and in all subsequent years, Area 3 inspections are to take place at the beginning of each rainy season and before and after all storm events totaling 0.5” or more of precipitation within any 3-hour period.

Sequence and Access Accessibility to Area 3 is good via the maintenance road. Inspection of Area 3 may follow the inspection of Sheet Pile No. 2 and proceed to the next upstream low priority area, Sheet Pile No. 3.

If maintenance for Area 3 should require the use of heavy equipment, access is to be gained via the location shown in Figure A.4, and the access ramp may be constructed using the example shown as Detail 1 in Figure A.14.

38 Wagon Wheel Creek Restoration Plan Maintenance Program

4.4.3 Between Vela Court and Sandy Knoll (Sheet Pile No. 3) Sheet Pile No. 3 (Figure 7 of WWCRP) is located between the Vela Court and Sandy Knoll crossings at Section 3519. The existing sheet pile is in relatively good condition and requires minimal improvements to the structure itself. Riparian planting is to be added along the channel banks to minimize local bank erosion.

Specific inspection guidance for Area 4 is provided in Appendix B.

Work Period The following time periods are recommended for various activities at various locations in this reach.

In-Channel Maintenance – May 1 to October 31. Bank Stabilization – May 1 to October 31. Vegetation Management  Vegetation pruning and removal on the lower bank and in the creek bed – May 1 to October 31 (with the potential for extension dependent upon dry conditions and OC Parks management notification and approval).  Non ground-breaking vegetation maintenance on upper banks of stream – All year.  Riparian planting and/or transplanting – Per biologist’s specifications.  Planting, pruning and removal, and access road clearing – All year.  Nursery stock tree planting – December 1 to May 31.  Mowing (if applicable, including along access roads) – All year.  Trail/Access Road Maintenance – All year.  General Park Amenities – All year.

Frequency For the first year following construction, inspections for needed maintenance to Sheet Pile No. 3 are to take place at the beginning and end of each rainy season as well as prior to and following all storm events totaling 0.5” or more of precipitation within any 3-hour period.

In the second year following construction and in all subsequent years, inspections of Sheet Pile No. 3 are to take place at the beginning of each rainy season and before and after all storm events totaling 0.5” or more of precipitation within any 3-hour period.

Sequence and Access Accessibility to Sheet Pile No. 3 is good via a trail/maintenance road. Inspection of Sheet Pile No. 3 may take place following the inspection of Area 3 and proceed to the next upstream low priority area, Area 5.

If maintenance for Sheet Pile 3 should require the use of heavy equipment, access is to be gained via the location shown in Figure A.6, and the access ramp may be constructed using the example shown as Detail 1 in Figure A.14.

39 Wagon Wheel Creek Restoration Plan Maintenance Program

4.4.4 Upstream of Oak Canyon Creek (Area 5) Area 5 (Figure 8 of WWRCP) is located upstream of the Oak Creek confluence at Section 5109. Improvements to Area 5 include an invert stabilizer to reduce high velocity flows resulting from the current steep slope in that reach as well as other supplemental erosion control materials such as downstream riprap and bank protection.

Specific inspection guidance for Area 5 is provided in Appendix B.

Work Period The following time periods are recommended for various activities at various locations in this reach.

In-Channel Maintenance – May 1 to October 31. Bank Stabilization – May 1 to October 31. Vegetation Management  Vegetation pruning and removal on the lower bank and in the creek bed – May 1 to October 31 (with the potential for extension dependent upon dry conditions and OC Parks management notification and approval).  Non ground-breaking vegetation maintenance on upper banks of stream – All year.  Riparian planting and/or transplanting – Per biologist’s specifications.  Planting, pruning and removal, and access road clearing – All year.  Nursery stock tree planting – December 1 to May 31.  Mowing (if applicable, including along access roads) – All year.  Trail/Access Road Maintenance – All year.  General Park Amenities – All year.

Frequency For the first year following construction, inspections for needed maintenance within Area 5 are to take place at the beginning and end of each rainy season as well as prior to and following all storm events totaling 0.5” or more of precipitation within any 3-hour period.

In the second year following construction and in all subsequent years, Area 5 inspections are to take place at the beginning of each rainy season and before and after all storm events totaling 0.5” or more of precipitation within any 3-hour period.

Sequence and Access Area 5 is accessible via a foot path off the trail/maintenance road. Inspection of Area 5 may follow the inspection of Sheet Pile No. 3 and will conclude the inspection of low priority areas.

If maintenance within Area 5 should require the use of heavy equipment, access is to be gained via the location shown in Figure A.7, and the access ramp may be constructed using the example shown as Detail 1 in Figure A.14.

40 Wagon Wheel Creek Restoration Plan Maintenance Program Section 5 - Inspection Checklists

This section provides detailed guidelines for inspection of the WWCRP improvement areas. An inspection checklist form for each WWCRP improvement area (see Figure 1 and Table 1) and a general maintenance record form are included in Appendix B. Additional pages can be added to narrate the inspection and maintenance issues, findings, conclusions and/or recommendations.

The WWCRP has a specific mission to stop the creek’s severe erosion problems developed over the past decades using a holistic approach to support the creek’s natural healing processes. This includes combined engineering measures and riparian planting strategically placed only in distinct locations with critical erosion control functions. These functions may be maintenance intensive prior to the full establishment of the restoration work. The inspection and maintenance staff should begin with the preparation of the technical background by a review of WWCRP and previous sections of this document. One cannot perform inspection and maintenance meeting the goal of WWCRP without an understanding of the functions, potential issues and maintenance needs of each type and area of improvement.

Maintenance personnel should be aware of the specific environmental requirements for any activities performed within and adjacent to the creek with the guidance of the OC Parks environmental coordinators and/or consultants. The following notes are to be taken prior to field work.

 It is expected that maintenance personnel will be familiar with the field conditions of each WWCRP improvement area and the stated boundaries for primary and extended inspection and maintenance, as shown in Appendix A.  The personnel should review previous inspection and maintenance records prior to their field work.  The personnel should document the site during each inspection with written notes and photographs in addition to filling in the inspection checklists and maintenance records.  The personnel should document the maintenance site before and after maintenance work has been performed with written notes and photographs in addition to filling in the maintenance record sheets.

Recommendations for maintenance made by inspection personnel may be reviewed, confirmed or revised by technical experts, except for emergency work. Any special problems observed should be reported immediately to the responsible management team, and repair and maintenance priorities should be established in an effective manner. Any erosion observed during inspection, such as the formation of a new scour hole, should not be ignored, as this may become problematic over time, resulting in costly or infeasible restoration such as those encountered in Areas 8 and 9.

41 Wagon Wheel Creek Restoration Plan Maintenance Program Section 6 - Emergency Maintenance

WWCRP routine maintenance activities are expected to occur under good weather conditions. It is preferred that such work be performed when the creek is relatively dry.

While emergency maintenance work is not expected to be performed by the Park’s inspection and maintenance team, the inspection and maintenance staff at the Park must understand the procedures during emergency conditions and respond appropriately. It should be noted that the Orange County Fire Authority (OCFA) Fuel Modification Plan and Emergency Action Plan are to be complied with where applicable.

Generally speaking, flooding, earthquakes and fire events are the main natural hazards of concern for Wagon Wheel Creek. These events can cause creek erosion, bank failure, debris jamming and loss of mature trees, habitats and other facilities. The worst hazard would likely be a post-fire flood, which can accelerate all of the problems stated above.

The WWCRP program of healing and restoring the creek would be significantly impacted by these events. Fire may clear the ground cover and induce more severe erosion and debris accumulation during subsequent floods. Floodwater impeded by debris is expected to overtop the bank in the lower reach (downstream of Vela Court), which may cause damage to roads and properties. This is also expected for Area 6, where park facilities are subject to damage. To reduce these damages, it is recommended that the maintenance staff perform the following:

 Check the weather forecast routinely to receive fire and flood warnings.  Establish a chain of command for emergency coordination with the OCFA and OCPW, including responsible names and contact methods. This information should be available to OC Parks management and the Park staff.  Have clear and early communication with key OCFA and OCPW personnel regarding critical protection needs during these events. This will raise the awareness of the erosion hazards stated in the WWCRP.  Be familiar with the area reference (Figure 1), access gates (Figure 2) and available access paths to the creek (Figures A.1 through A.13 in Appendix A). Maintain these maps in the Park Ranger Station and provide them in advance to key OCFA and OCPW personnel.  Perform practice drills, if necessary, to ascertain procedures and improve response time and performance. Assist OCFA and OCPW in directing park users to evacuate from the site promptly during natural hazard events.

42 Wagon Wheel Creek Restoration Plan Maintenance Program

Appendix A Inspection & Maintenance Figures

Wagon Wheel Creek Restoration Plan Maintenance Program

Figure A.1 Inspection & Maintenance Boundary for Area 1 (Sheet Pile 1)

Legend 1151 Area 1 Maintenance Area Primary Maintenance Area Extended Maintenance Area ³ !1 Area 1 Access Point

Project Cross Sections Approximate Stream Invert Gen.Thomas F. Riley Wilderness Park Boundary

Heavy equipment access via existing maintenance road.

!1

1059 Sheet Pile 1 located along Section 1028

1028

1000

INSPECTION AND MAINTENANCE IN THIS AREA IS SUBJECT TO COOPERATIVE AGREEMENT WITH THE RANCHO MISSION VIEJO COMPANY

50 40 30 20 10 0 50 Feet Wagon Wheel Creek Restoration Plan Maintenance Program

Figure A.2 Inspection & Maintenance Boundary for Area 2 (ArmorFlex Area)

1880

See Figure A.14 for example of heavy equipment access to channel

1750

!2 1729

1706 !2

71 16

Legend

Area 2 Maintenance Area Primary Maintenance Area Extended Maintenance Area !2 Area 2 Access Point ³ Project Cross Sections 1602 Approximate Stream Invert Gen. Thomas F. Riley Wilderness Park Boundary

50 40 30 20 10 0 50 Feet Wagon Wheel Creek Restoration Plan Maintenance Program

Figure A.3 Inspection & Maintenance Boundary for Sheet Pile No. 2 (Downstream of S-Turn)

2134

2111 See Figure A.14 for example 2076 of heavy equipment access to channel.

!S2

See Figure A.14 for example of heavy

equipment access to channel 2020

1985 Legend Sheet Pile 2 Maintenance Area !S2 Primary Maintenance Area Extended Maintenance Area !S2 Sheet Pile 2 Access Point ³ Project Cross Sections Approximate Stream Invert Gen. Thomas F. Riley Wilderness Park Boundary

1880

50 40 30 20 10 0 50 Feet Wagon Wheel Creek Restoration Plan Maintenance Program

Figure A.4 Inspection & Maintenance Boundary for Area 3 (S-Turn Area)

2532 See Figure A.14 for example of heavy equipment access to channel

2467 !3

2428

!3 2368

F 2290 A

I R

V

A

L

L

E

Y

C

O U

R 2212 T See Figure A.14 for example of heavy equipment access to channel

Legend

Area 3 Maintenance Area Primary Maintenance Area Extended Maintenance Area ³ 3 ! Area 3 Access Point 2134 Project Cross Sections Approximate Stream Invert 2111 Gen. Thomas F. Riley Wilderness Park Boundary

2076 50 40 30 20 10 0 50 Feet Wagon Wheel Creek Restoration Plan Maintenance Program

Figure A.5 Inspection & Maintenance Boundary for Area 4 (Downstream of Vela Court)

2821 2791

Legend VELA COURT Area 4 Maintenance Area Primary Maintenance Area Extended Maintenance Area !4 ³ Area 4 Access Point Project Cross Sections Approximate Stream Invert Gen. Thomas F. Riley Wilderness Park Boundary !4

2684

2636

See Figure A.14 for example of heavy equipment access to channel 2604

See Figure A.15 for example 2586 of heavy equipment access to channel

!4

2532

!4

2467 2428 0 50 100 Feet 2290 Wagon Wheel Creek Restoration Plan Maintenance Program

Figure A.6 Inspection & Maintenance Boundary for Sheet Pile No. 3 (Between Vela Ct. & Sandy Knoll)

SOUTH BEND ROAD Legend

Sheet Pile 3 Maintenance Area

Primary Maintenance Area Extended Maintenance Area ³ !3S Access Point for Sheet Pile 3

Project Cross Sections

Approximate Stream Invert

Gen. Thomas F. Riley Wilderness Park Boundary

3728

See Figure A.14 for example of heavy equipment access to channel

!3S

519 3

Sheet Pile 3 located along Section 3519 See Figure A.14 for example of heavy equipment access to channel

!3S

3442

50 40 30 20 10 0 50 Feet Wagon Wheel Creek Restoration Plan Maintenance Program

Figure A.7 Inspection & Maintenance Boundary for Area 5 (Upstream of Oak Canyon Creek)

!5

5109 See Figure A.14 for example of heavy equipment access to channel

Legend

Area 5 Maintenance Area Primary Maintenance Area Extended Maintenance Area !5 Area 5 Access Point ³ Project Cross Sections Approximate Stream Invert Gen. Thomas F. Riley Wilderness Park Boundary

4908

050100 Feet Wagon Wheel Creek Restoration Plan Maintenance Program

Figure A.8 Inspection & Maintenance Boundary for Area 6 (Near Park Ranger Station)

6726

See Figure A.14 for example of heavy equipment access to channel

PARK ENTRANCE ROAD

!6 See Figure A.14 for 6326 example of heavy 6285 equipment access to channel

6100 !6 OSO PARKWAY 6050

6009

Legend 5965

Area 6 Maintenance Area 5913 Primary Maintenance Area Extended Maintenance Area ³ 5860 !6 Area 6 Access Point

Project Cross Sections See Figure A.14 for example Approximate Stream Invert of heavy equipment access !6 5752 to channel Gen. Thomas F. Riley Wilderness Park Boundary 5714

5672 50 0 50 100 150 200 Feet Wagon Wheel Creek Restoration Plan Maintenance Program

Figure A.9 Inspection & Maintenance Boundary for Area 7 (Oso Creek Culvert)

Legend

Area 7 Maintenance Area Existing Oso Parkway Culvert Primary Maintenance Area OSO PARKWAY Extended Maintenance Area !7 Area 7 Access Point ³ !SE Entrenched Sections Access Point

Project Cross Sections Approximate Stream Invert Gen. Thomas F. Riley Wilderness Park Boundary

SE ! Approx. flowline of Oso Parkway culvert outflow

8270 See Figure A.14 for example of heavy equipment access to channel

!7

Heavy equipment access via existing trail/maintenance road.

0 25 50 100 Feet Wagon Wheel Creek Restoration Plan Maintenance Program

Figure A.10 Inspection & Maintenance Boundary for Entrenched Sections (Downstream & Upstream of Area 7)

Legend

Entrenched Sections Maintenance Area ES8843 !ES Primary Maintenance Area ! !8 Extended Maintenance Area

!ES Entrenched Sections Access Point

See Figure A.15A.16 for OSO PARKWAY 7 ! Area 7 Access Point example of heavy 8 ³ equipment access ! Area 8 Access Point to channel !ES 8645 Project Cross Sections Approximate Stream Invert Gen. Thomas F. Riley Wilderness Park Boundary !ES

See Figure A.15 for example of !ES heavy equipment access to channel 8270 !ES !7

!7

ES ! 7853 !ES

See Figure A.15 for example of heavy equipment access to channel

!ES See Figure A.14 for example of 7461 heavy equipment access to channel !ES

100 0 100 200 Feet Wagon Wheel Creek Restoration Plan Maintenance Program

Figure A.11 Inspection & Maintenance Boundary for Area 8 (Wide Area Sections)

9645

!9 9587

Existing Large Drop 9562 9532

9504 9 459 9449

9434 OSO PARKWAY

9320 Heavy equipment access for Area 8 and lower portion of Area 9 !9 See Figure A.16 for example of heavy equipment access to channel 9241

9134 Legend

Area 8 Maintenance Area Primary Maintenance Area Extended Maintenance Area !8 Area 8 Access Point ³ !8 !9 Area 9 Access Point Project Cross Sections Approximte Stream Invert Thomas F Riley Wilderness Park Boundary

8843

100 50 0 100 Feet !8 Wagon Wheel Creek Restoration Plan Maintenance Program

Figure A.12 Inspection & Maintenance Boundary for Area 9 (Downstream & Upstream of Pedestrian Bridge)

Pedestrian Bridge

!9

See Figure A.14 for example 9730

of heavy equipment access 9711 to channel 9693

9667

9645

9600 !9 9587 See Figure A.16 for example of heavy equipment access 9562 2 to channel 953 9520 Existing Large Drop 9504

9459

9449

Heavy equipment access for Area 8 and lower portion of Area 9 9434 See Figure A.16 for example of heavy equipment access to channel

Legend

Area 9 Maintenance Area Primary Maintenance Area

Extended Maintenance Area 9320 !9 Area 9 Access Point ³ !9 !8 Area 8 Access Point Project Cross Sections Approximate Stream Invert 9241 Gen. Thomas F. Riley Wilderness Park Boundary

100 0 100 Feet Wagon Wheel Creek Restoration Plan Maintenance Program

Figure A.12.2 Extended Inspection & Maintenance Boundary for Area 9B (Upstream of Pedestrian Bridge)

0 1118 Existing Oso Parkway Trail Undercrossing

OSO PARKWAY

10742

Legend

Area 9B Maintenance Area Primary Maintenance Area Extended Maintenance Area !9 Area 9 Access Point ³ Project Cross Sections Approximate Stream Invert Gen. Thomas F. Riley Wilderness Park Boundary

10286

Existing Concrete Spillway

See Figure A.14 for example of heavy equipment access to channel 9978

See Figure A.16 for example of heavy equipment access to channel !9 9730 9693 Pedestrian Bridge 150 0 150 300 Feet 9600 !9 Wagon Wheel Creek Restoration Plan Maintenance Program

Figure A.13 Inspection & Maintenance Boundary for Area 11 (Including Area 10/Gabion Area)

Legend

Area 11 Maintenance Area Primary Maintenance Area Extended Maintenance Area Culvert Outflow and Headwall !11 Access Point for Areas 11 & 10 ³ Project Cross Sections Approximate Stream Invert Gen. Thomas F. Riley Wilderness Park Boundary

See Figure A.14 for example of heavy equipment access to channel

11462 1 4 148411473 1159 11454 11504 11573 11426 1548 11411 1 OSO PARKWAY

11526 !11 Gabion Area (Area 10) to be inspected only. NO MAINTENANCE

11180

50 0 50 100 150 200 Feet Figure A.14 Construction / Maintenance Access Ramp Detail No. 1 Figure A.15 Construction / Maintenance Access Ramp Detail No. 2 Figure A.16 Construction / Maintenance Access Ramp Detail No. 3

Wagon Wheel Creek Restoration Plan Maintenance Program

Appendix B Inspection Checklists

Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Area 1 Inspection Checklist (Sheet Pile No. 1) Objective: The overall objective of this improvement is to repair and stabilize Sheet Pile No. 1 in order to restore its function as a drop structure to control the invert elevation and provide a key support level for the creek profile extending upstream from Sheet Pile No. 1. Inspector’s Name(s)/Title(s): Date: 1. Sheet Pile Y N N/A Looking across the channel and viewing the sheet pile in section view, the panels appear to be bent Viewing the downstream face of the sheet pile, the panels have become separated or dislodged There has been displacement of rocks placed downstream of the sheet pile Soils in contact with the sheet piles are lost Flow direction changed due to vegetation, debris, sediments, or entrenchment Elevation drop has been reduced (i.e., there are signs of sediment accumulation in the channel downstream of the sheet pile) 2. Derrick Stones and/or Riprap Upstream and Downstream of Sheet Pile Y N N/A Stones are clogged with debris and/or sediments Stones and/or bank riprap materials are displaced or disintegrated Gaps have formed between the stones and sheet pile Filter layer (fabric or gravel) is exposed or damaged 3. Riprap Bank Protection Y N N/A Stones are clogged with debris and/or sediment Stones are missing or have been misplaced Riprap has been undermined or bank is slumping Filter layer (fabric or gravel) is exposed or damaged 4. Channel Geometry and Profile Y N N/A There has been a noticeable change to channel section geometry There has been widening of the right bank There has been widening of the left bank Sloughing has occurred along channel bank (i.e., slough material is present along the toe of slope) A channel discontinuity has formed (i.e., a sudden drop along the channel bed) There is noticeable lowering of the channel bed Channel low flow line has altered A new channel low flow line has formed 5. Riparian Planting/Revegetation Y N N/A Plantings appear to be receiving insufficient irrigation Off-trail visitor use has resulted in the trampling of vegetation Ground cover is sparse and not in good condition Density seems to be too high that may affect channel capacity

Area 1 - Page 1 of 6 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Area 1 - Sheet Pile No. 1 (Continued) 6. Non-native and Invasive Plants Y N N/A Invasive or non-native vegetation is present Non-native or invasive plants appear to be stabilizing the banks or bed (if yes, removal must be carefully planned) 7. Water Flow Y N N/A There is water flow present in the main channel There is water flow from the tributaries or lateral drain There is evidence of lateral water flow since last inspection 8. Groundwater Y N N/A There is visible groundwater seepage There is evidence of soil moisture on the bank 9. Weather Y N N/A Substantial rainfall occurred at the time of inspection Substantial rainfall has occurred since the last inspection 10. Other Y N N/A There is a condition causing substantial visible contrast to normal conditions Large woody debris, fallen trees, or sediments appear to be obstructing creek flow or posing a threat Dumping has been observed Uncontrolled creek access or trampling has created a potential erosion problem Large blockages are present that are too large to remove by hand Fencing is damaged or in need of repair There is evidence of graffiti of other vandalism Trail, interpretive, informational, and/or regulatory signage is damaged or missing

OVERALL CONDITION: Excellent Good Fair Poor

For any [Y] response above, describe observations and necessary corrective actions on the following page

Photograph observed areas/issues of concern, and prepare photo journal for reference and monitoring

Report any significant issues and required maintenance actions to Sr. Park Ranger at Riley Wilderness Park

Area 1 - Page 2 of 6 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Area 1 - Sheet Pile No. 1 (Continued) Descriptions of observations checked [Y] above: (add additional pages if needed)

Corrective measures implemented since last inspection: (add additional pages if needed)

Location(s) and description(s) of required maintenance or corrective/preventative measures: (add additional pages if needed)

Area 1 - Page 3 of 6 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Area 1 - Sheet Pile No. 1 (Continued) Photo Journal Area 1 – Sheet Pile No. 1-(add additional pages if needed) 1. Sheet Pile Date: Insert photo/s here Comment:

2. Derrick Stones and/or Riprap Upstream and Downstream of Sheet Pile Date: Insert photo/s here Comments:

3. Riprap Bank Protection Date: Insert photo/s here Comments:

4. Channel Geometry and Profile Date: Insert photo/s here Comments:

5. Riparian Planting/Revegetation Date: Insert photo/s here Comments:

Area 1 - Page 4 of 6 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Area 1 - Sheet Pile No. 1 (Continued) Photo Journal (Continued) Area 1 – Sheet Pile No. 1 (add additional pages if needed) 6. Non-native and Invasive Plants Date: Insert photo/s here Comments:

7. Water Flow Date: Insert photo/s here Comments:

8. Groundwater Date: Insert photo/s here Comment:

9. Weather Date: Insert photo/s here Comments:

10. Other Date: Insert photo/s here Comments:

Area 1 - Page 5 of 6 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Area 1 - Sheet Pile No. 1 (Continued) Additional Notes:

Area 1 - Page 6 of 6 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Area 2 Inspection Checklist (ArmorFlex Area) Objective: The objective of this improvement is to reinforce the existing ArmorFlex blanket’s stability with riprap around the blanket edges including banks and unprotected channel invert by adding toe-down protection across the channel to prevent scouring around the blocks advancing upstream and to increase bank stability with riparian planting. Inspector’s Name(s)/Title(s): Date: 1. Derrick Stones and/or Riprap Upstream and Downstream of Sheet Pile Y N N/A Stones are clogged with debris and/or sediment Stones and/or bank riprap materials are displaced and disintegrated from the ArmorFlex Gaps have formed between the stones and ArmorFlex Filter layer (gravel or fabric) is exposed or damaged 2. ArmorFlex Y N N/A Concrete units are tilted Concrete units are chipped or cracked Backfill surface is undetermined (lower than concrete block) The edges of the ArmorFlex are exposed ArmorFlex cable is broken 3. Riprap Bank Protection Y N N/A Stones are clogged with debris and/or sediment Stones are missing or have been misplaced Riprap has been undermined or bank is slumping Filter layer (fabric or gravel) is exposed or damaged 4. Riparian Planting/Revegetation Y N N/A Plantings appear to be receiving insufficient irrigation Off-trail visitor use resulted in the trampling of vegetation Ground cover is sparse and not in good condition Density seems to be too high that may affect channel capacity 5. Non-native and Invasive Plants Y N N/A Invasive or non-native vegetation is present Non-native or invasive plants appear to be stabilizing the banks or bed (if yes, removal must be carefully planned) 6. Water Flow Y N N/A There is water flow present in the main channel There is water flow from the tributaries or lateral drain There is evidence of lateral water flow since last inspection 7. Groundwater Y N N/A There is evidence of soil moisture on the bank There is visible groundwater seepage 8. Weather Substantial rainfall occurred at the time of inspection Substantial rainfall occurred since the last inspection

Area 2 - Page 1 of 6 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Area 2 - ArmorFlex Area (Continued) 9. Channel Geometry and Profile Y N N/A There has been a noticeable change to channel section geometry There has been widening of the right bank There has been widening of the left bank Sloughing has occurred along channel bank (i.e., slough material is present along the toe of slope) A channel discontinuity has formed (i.e., a sudden drop along the channel bed) There is noticeable lowering of the channel bed Channel low flow line has altered A new channel low flow line has formed 10. Other Y N N/A There is a condition causing substantial visible contrast to normal conditions Large woody debris, fallen trees, or sediments appear to be obstructing creek flow or posing a threat Dumping has been observed Uncontrolled creek access or trampling has created a potential erosion problem There are large blockages present that are too large to remove by hand Fencing is damaged or in need of repair There is evidence of graffiti of other vandalism Trail, interpretive, informational, and/or regulatory signage is damaged or missing

OVERALL CONDITION: Excellent Good Fair Poor

For any [Y] response above, describe observations and necessary corrective actions on the following page

Photograph observed areas/issues of concern, and prepare photo journal for reference and monitoring

Report any significant issues and required maintenance actions to Sr. Park Ranger at Riley Wilderness Park

Area 2 - Page 2 of 6 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Area 2 - ArmorFlex Area (Continued) Descriptions of observations checked [Y] above: (add additional pages if needed)

Corrective measures implemented since last inspection: (add additional pages if needed)

Location(s) and description(s) of required maintenance or corrective/preventative measures: (add additional pages if needed)

Area 2 - Page 3 of 6 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Area 2 - ArmorFlex Area (Continued) Photo Journal Area 2 - ArmorFlex Area (add additional pages if needed) 1. Derrick Stones and/or Riprap Upstream and Downstream of Sheet Pile Date: Insert photo/s here Comment:

2. AmorFlex Date: Insert photo/s here Comments:

3. Riprap Bank Protection Date: Insert photo/s here Comments:

4. Riparian Planting/Revegetation Date: Insert photo/s here Comments:

5. Non-native and Invasive Plants Date: Insert photo/s here Comments:

Area 2 - Page 4 of 6 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Area 2 - ArmorFlex Area (Continued) Photo Journal (Continued) Area 2 - ArmorFlex Area (add additional pages if needed) 6. Water Flow Date: Insert photo/s here Comments:

7. Groundwater Date: Insert photo/s here Comments:

8. Weather Date: Insert photo/s here Comment:

9. Channel Geometry and Profile Date: Insert photo/s here Comments:

10. Other Date: Insert photo/s here Comments:

Area 2 - Page 5 of 6 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Area 2 - ArmorFlex Area (Continued) Additional Notes:

Area 2 - Page 6 of 6 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Sheet Pile No. 2 Inspection Checklist (Downstream of S-Turn) Objective: The objective of this improvement is to increase the stability of the existing sheet pile with riprap placement and riparian planting. Inspector’s Name(s)/Title(s): Date: 1. Sheet Pile Y N N/A Looking across the channel and viewing the sheet pile in section view, the panels appear to be bent Viewing the downstream face of the sheet pile, the panels have become separated or dislodged There has been displacement of rocks placed downstream of the sheet pile Soils in contact with the sheet piles are lost Flow direction changed due to vegetation, debris, sediments, or entrenchment Elevation drop has been reduced (i.e., there are signs of sediment accumulation in the channel downstream of the sheet pile) 2. Riprap along Toe of Slope and on the Banks, if applicable Y N N/A Stones are clogged with debris and/or sediment Stones are missing or have been misplaced Riprap has been undermined or bank is slumping Filter fabric is exposed or damaged 3. Riprap Upstream and Downstream of Control Structure, if applicable Y N N/A Stones are clogged with debris and/or sediment Stones are missing or have been misplaced Gaps have formed between the stones and control structure Filter layer (fabric or gravel) is exposed or damaged 4. Riparian Planting/Revegetation Y N N/A Plantings appear to be receiving insufficient irrigation Off-trail visitor use resulted in the trampling of vegetation Ground cover is sparse and not in good condition Density seems to be too high that may affect channel capacity 5. Non-native and Invasive Plants Y N N/A Invasive or non-native vegetation is present Non-native or invasive plants appear to be stabilizing the banks or bed (if yes, removal must be carefully planned) 6. Water Flow Y N N/A There is water flow present in the main channel There is water flow from the tributaries or lateral drain There is evidence of lateral water flow since last inspection 7. Groundwater Y N N/A There is evidence of soil moisture on the bank There is visible groundwater seepage

Sheet Pile No. 2 - Page 1 of 6 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Sheet Pile No. 2 - Downstream of S-Turn (Continued) 8. Channel Geometry and Profile Y N N/A There has been a noticeable change to channel section geometry There has been widening of the right bank There has been widening of the left bank Sloughing has occurred along channel bank (i.e., there is slough material present along the toe of slope) A channel discontinuity has formed (i.e., a sudden drop along the channel bed) There is noticeable lowering of the channel bed Channel low flow line has altered A new channel low flow line has formed 9. Weather Y N N/A Substantial rainfall has occurred at the time of inspection Substantial rainfall has occurred since the last inspection 10. Other Y N N/A There is a condition causing substantial visible contrast to normal conditions Large woody debris, fallen trees, or sediments appear to be obstructing creek flow or posing a threat Dumping has been observed Uncontrolled creek access or trampling has created a potential erosion problem Large blockages are present that are too large to remove by hand Fencing is damaged or in need of repair There is evidence of graffiti of other vandalism Trail, interpretive, informational and/or regulatory signage is damaged or missing

OVERALL CONDITION: Excellent Good Fair Poor

For any [Y] response above, describe observations and necessary corrective actions on the following page

Photograph observed areas/issues of concern, and prepare photo journal for reference and monitoring

Report any significant issues and required maintenance actions to Sr. Park Ranger at Riley Wilderness Park

Sheet Pile No. 2 - Page 2 of 6 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Sheet Pile No. 2 - Downstream of S-Turn (Continued) Descriptions of observations checked [Y] above: (add additional pages if needed)

Corrective measures implemented since last inspection: (add additional pages if needed)

Location(s) and description(s) of required maintenance or corrective/preventative measures: (add additional pages if needed)

Sheet Pile No. 2 - Page 3 of 6 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Sheet Pile No. 2 - Downstream of S-Turn (Continued) Photo Journal Sheet Pile No. 2 - Downstream of S-Turn -(add additional pages if needed) 1. Sheet Pile Date: Insert photo/s here Comment:

2. Riprap along Toe of Slope and on the Banks, if applicable Date: Insert photo/s here Comments:

3. Riprap Upstream and Downstream of Control Structure, if applicable Date: Insert photo/s here Comments:

4. Riparian Planting/Revegetation Date: Insert photo/s here Comments:

5. Non-native and Invasive Plants Date: Insert photo/s here Comments:

6. Water Flow Date: Insert photo/s here Comments:

Sheet Pile No. 2 - Page 4 of 6 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Sheet Pile No. 2 - Downstream of S-Turn (Continued) Photo Journal (Continued) Sheet Pile No. 2 - Downstream of S-Turn (add additional pages if needed) 7. Groundwater Date: Insert photo/s here Comments:

8. Channel Geometry and Profile Date: Insert photo/s here Comment:

9. Weather Date: Insert photo/s here Comments:

10. Other Date: Insert photo/s here Comments:

11. Other Date: Insert photo/s here Comments:

Sheet Pile No. 2 - Page 5 of 6 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Sheet Pile No. 2 - Downstream of S-Turn (Continued) Additional Notes:

Sheet Pile No. 2 - Page 6 of 6 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Area 3 Inspection Checklist (S-Turn Area) Objective: The objective of this improvement is to reduce bank scour due to flow impingement at the outer curves of the S-Turn. The planting is to reduce flow velocities and redirect flows away from the banks. Inspector’s Name(s)/Title(s): Date: 1. Riparian Planting/Revegetation Y N N/A Plantings appear to be receiving insufficient irrigation Off-trail visitor use has resulted in the trampling of vegetation Ground cover is sparse and not in good condition Density seems to be too high that may affect channel capacity 2. Derrick Stones or Riprap along Toe of Slope, if applicable Y N N/A Stones are clogged with debris and/or sediment Stones are missing or have been misplaced Riprap has been undermined or bank is slumping Filter fabric is exposed or damaged 3. Riprap Bank Protection, if applicable Y N N/A Stones are clogged with debris and/or sediment Stones are missing or have been misplaced Riprap has been undermined or bank is slumping Filter layer (fabric or gravel) is exposed or damaged 4. Non-native and Invasive Plants Y N N/A Invasive or non-native vegetation is present Non-native or invasive plants appear to be stabilizing the banks or bed (if yes, removal must be carefully planned) 5. Water Flow Y N N/A There is water flow present in the main channel There is water flow from the tributaries or lateral drain There is evidence of lateral water flow since last inspection 6. Groundwater Y N N/A There is evidence of soil moisture on the bank There is visible groundwater seepage 7. Channel Geometry and Profile Y N N/A There has been a noticeable change to channel section geometry There has been widening of the right bank There has been widening of the left bank Sloughing has occurred along channel bank (i.e., there is slough material present along the toe of slope) A channel discontinuity has formed (i.e., a sudden drop along the channel bed) There is noticeable lowering of the channel bed Channel low flow line has altered A new channel low flow line has formed There is evidence of graffiti of other vandalism Trail, interpretive, informational, and/or regulatory signage is damaged or missing 8. Weather Y N N/A Substantial rainfall occurred at the time of inspection Substantial rainfall occurred since the last inspection

Area 3 - Page 1 of 6 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Area 3 - S-Turn Area (Continued) 9. Other Y N N/A There is a condition causing substantial visible contrast to normal conditions Large woody debris, fallen trees, or sediments appear to be obstructing creek flow or posing a threat Dumping has been observed Uncontrolled creek access or trampling has created a potential erosion problem Fencing is damaged or in need of repair

OVERALL CONDITION: Excellent Good Fair Poor

For any [Y] response above, describe observations and necessary corrective actions on the following page

Photograph observed areas/issues of concern, and prepare photo journal for reference and monitoring

Report any significant issues and required maintenance actions to Sr. Park Ranger at Riley Wilderness Park

Area 3 - Page 2 of 6 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Area 3 - S-Turn Area (Continued) Descriptions of observations checked [Y] above: (add additional pages if needed)

Corrective measures implemented since last inspection: (add additional pages if needed)

Location(s) and description(s) of required maintenance or corrective/preventative measures: (add additional pages if needed)

Area 3 - Page 3 of 6 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Area 3 - S-Turn Area (Continued) Photo Journal Area 3 - S-Turn Area -(add additional pages if needed) 1. Riparian Planting/Revegetation Date: Insert photo/s here Comment:

2. Derrick Stones or Riprap along Toe of Slope, if applicable Date: Insert photo/s here Comments:

3. Riprap Bank Protection, if applicable Date: Insert photo/s here Comments:

4. Non-native and Invasive Plants Date: Insert photo/s here Comments:

5. Water Flow Date: Insert photo/s here Comments:

6. Groundwater Date: Insert photo/s here Comments:

Area 3 - Page 4 of 6 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Area 3 - S-Turn Area (Continued) Photo Journal (Continued) Area 3 - S-Turn Area (add additional pages if needed) 7. Channel Geometry and Profile Date: Insert photo/s here Comments:

8. Weather Date: Insert photo/s here Comment:

9. Other Date: Insert photo/s here Comments:

10. Other Date: Insert photo/s here Comments:

11. Other Date: Insert photo/s here Comments:

Area 3 - Page 5 of 6 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Area 3 - S-Turn Area (Continued) Additional Notes:

Area 3 - Page 6 of 6 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Area 4 Inspection Checklist (Downstream of Vela Court) Objective: The objective of this improvement is to protect the existing steep channel downstream of the existing riprap reach and prevent headcut erosion. Inspector’s Name(s)/Title(s): Date: 1. Invert Control/Grade Control (Section 2578) Y N N/A Structure appears to have been damaged Stones are missing or displaced Scour holes have formed downstream and undermined the control structure (toe of the riprap slope is exposed) Riprap bank protection has been eroded or disintegrated from the riprap stones on the bottom Flow direction changed due to vegetation, debris, sediments or entrenchment Elevation drop has been reduced (i.e., there are signs of sediment accumulation in the channel downstream of the control) Displaced rocks were found downstream of the structure There has been displacement of rocks placed downstream of the structure 2. Invert Control/Grade Control (middle section) Y N N/A Structure appears to have been damaged Stones are missing or displaced Scour holes have formed downstream and undermined the control structure (toe of the riprap slope is exposed) Riprap bank protection has been eroded or disintegrated from the riprap stones on the bottom Flow direction changed due to vegetation, debris, sediments or entrenchment Elevation drop has been reduced (i.e., there are signs of sediment accumulation in the channel downstream of the control) Displaced rocks were found downstream of the structure There has been displacement of rocks placed downstream of the structure 3. Invert Control/Grade Control (Section 2625) Y N N/A Structure appears to have been damaged Stones are missing or displaced Scour holes have formed downstream and undermined the control structure (toe of the riprap slope is exposed) Riprap bank protection has been eroded or disintegrated from the riprap stones on the bottom Flow direction changed due to vegetation, debris, sediments or entrenchment Elevation drop has been reduced (i.e., there are signs of sediment accumulation in the channel downstream of the control) Displaced rocks were found downstream of the structure There has been displacement of rocks placed downstream of the structure 4. Riprap Upstream and Downstream of Control Structure Y N N/A Stones are clogged with debris and/or sediment Stones are missing or have been misplaced Gaps formed between the stones and control structure Filter layer (fabric or gravel) is exposed or damaged 5. Riprap Bank Protection Stones are clogged with debris and/or sediment Stones are missing or have been misplaced Riprap has been undermined or bank is slumping Area 4 - Page 1 of 6 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Area 4 - Downstream of Vela Court (Continued) 5. Riprap Bank Protection (continued) Y N N/A Filter layer (fabric or gravel) is exposed or damaged 6. Channel Geometry and Profile Y N N/A There has been a noticeable change to channel section geometry There has been widening of the right bank There has been widening of the left bank Sloughing has occurred along channel bank (i.e., there is slough material present along the toe of slope) A channel discontinuity has formed (i.e., a sudden drop along the channel bed) There is noticeable lowering of the channel bed Channel low flow line has altered A new channel low flow line has formed 7. Riparian Planting/Revegetation Y N N/A Plantings appear to be receiving insufficient irrigation Off-trail visitor use has resulted in the trampling of vegetation Ground cover is sparse and not in good condition Density seems to be too high that may affect channel capacity 8. Non-native and Invasive Plants Y N N/A Invasive or non-native vegetation is present Non-native or invasive plants appear to be stabilizing the banks or bed (if yes, removal must be carefully planned) 9. Water Flow Y N N/A There is water flow present in the main channel There is water flow from the tributaries or lateral drain There is evidence of lateral water flow since last inspection 10. Groundwater Y N N/A There is evidence of soil moisture on the bank There is visible groundwater seepage 11. Weather Y N N/A Substantial rainfall occurred at the time of inspection Substantial rainfall occurred since the last inspection 12. Other Y N N/A There is a condition causing substantial visible contrast to normal conditions Large woody debris, fallen trees, or sediments appear to be obstructing creek flow or posing a threat Dumping has been observed Uncontrolled creek access or trampling has created a potential erosion problem Large blockages are present that are too large to remove by hand Fencing is damaged or in need of repair There is evidence of graffiti of other vandalism Trail, interpretive, informational, and/or regulatory signage is damaged or missing

OVERALL CONDITION: Excellent Good Fair Poor

For any [Y] response above, describe observations and necessary corrective actions on the following page

Photograph observed areas/issues of concern, and prepare photo journal for reference and monitoring

Report any significant issues and required maintenance actions to Sr. Park Ranger at Riley Wilderness Park Area 4 - Page 2 of 6 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Area 4 - Downstream of Vela Court (Continued) Descriptions of observations checked [Y] above: (add additional pages if needed)

Corrective measures implemented since last inspection: (add additional pages if needed)

Location(s) and description(s) of required maintenance or corrective/preventative measures: (add additional pages if needed)

Area 4 - Page 3 of 6 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Area 4 - Downstream of Vela Court (Continued) Photo Journal Area 4 - Downstream of Vela Court -(add additional pages if needed) 1. Invert Control/Grade Control (Section 2578) Date: Insert photo/s here Comment:

2. Invert Control/Grade Control (middle section) Date: Insert photo/s here Comments:

3. Invert Control/Grade Control (Section 2625) Date: Insert photo/s here Comments:

4. Riprap Upstream and Downstream of Control Structure Date: Insert photo/s here Comments:

5. Riprap Bank Protection Date: Insert photo/s here Comments:

Area 4 - Page 4 of 6 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Area 4 - Downstream of Vela Court (Continued) Photo Journal (Continued) Area 4 - Downstream of Vela Court (add additional pages if needed) 6. Channel Geometry and Profile Date: Insert photo/s here Comments:

7. Riparian Planting/Revegetation Date: Insert photo/s here Comments:

8. Non-native and Invasive Plants Date: Insert photo/s here Comments:

9. Water Flow Date: Insert photo/s here Comment:

10. Groundwater Date: Insert photo/s here Comments:

Area 4 - Page 5 of 6 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Area 4 - Downstream of Vela Court (Continued) Photo Journal (Continued) Area 4 - Downstream of Vela Court (add additional pages if needed) 11. Weather Date: Insert photo/s here Comments:

12. Other Date: Insert photo/s here Comments:

Additional Notes:

Area 4 - Page 6 of 6 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Sheet Pile No. 3 Inspection Checklist (Between Vela Ct. and Sandy Knoll) Objective: The objective of this improvement is to increase the stability of the existing sheet pile with riprap and riparian planting. Inspector’s Name(s)/Title(s): Date: 1. Sheet Pile Y N N/A Looking across the channel and viewing the sheet pile in section view, the panels appear to be bent Viewing the downstream face of the sheet pile, the panels have become separated or dislodged There has been displacement of rocks placed downstream of the sheet pile Scour of soils in contact with the sheet piles Flow direction changed due to vegetation, debris, sediments, or entrenchment Elevation drop has been reduced (i.e., there are signs of sediment accumulation in the channel downstream of the sheet pile) 2. Riprap along Toe of Slope and on the Banks, if applicable Y N N/A Stones are clogged with debris and/or sediment Stones are missing or have been misplaced Riprap has been undermined or bank is slumping Filter fabric is exposed or damaged 3. Riprap Upstream and Downstream of Control Structure, if applicable Y N N/A Stones are clogged with debris and/or sediment Stones are missing or have been misplaced Gaps have formed between the stones and control structure Filter layer (fabric or gravel) is exposed or damaged 4. Riparian Planting/Revegetation Y N N/A Plantings appear to be receiving insufficient irrigation Off-trail visitor use has resulted in the trampling of vegetation Ground cover is sparse and not in good condition Density seems to be too high that may affect channel capacity 5. Non-native and Invasive Plants Y N N/A Invasive or non-native vegetation is present Non-native or invasive plants appear to be stabilizing the banks or bed (if yes, removal must be carefully planned) 6. Water Flow Y N N/A There is water flow present in the main channel There is water flow from the tributaries or lateral drain There is evidence of lateral water flow since last inspection 7. Groundwater Y N N/A There is evidence of soil moisture on the bank There is visible groundwater seepage

Sheet Pile No. 3 - Page 1 of 6 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Sheet Pile No. 3 - Between Vela Ct. and Sandy Knoll (Continued) 8. Channel Geometry and Profile Y N N/A There has been a noticeable change to channel section geometry There has been widening of the right bank There has been widening of the left bank Sloughing has occurred along channel bank (i.e., there is slough material present along the toe of slope) A channel discontinuity has formed (i.e., a sudden drop along the channel bed) There is noticeable lowering of the channel bed Channel low flow line has altered A new channel low flow line has formed 9. Weather Y N N/A Substantial rainfall occurred at the time of inspection Substantial rainfall has occurred since the last inspection 10. Other Y N N/A There is a condition causing substantial visible contrast to normal conditions Large woody debris, fallen trees, or sediments appear to be obstructing creek flow or posing a threat Dumping has been observed d Uncontrolled creek access or trampling has created a potential erosion problem Large blockages are present that are too large to remove by hand Fencing is damaged or in need of repair There is evidence of graffiti of other vandalism Trail, interpretive, informational, and/or regulatory signage is damaged or missing

OVERALL CONDITION: Excellent Good Fair Poor

For any [Y] response above, describe observations and necessary corrective actions on the following page

Photograph observed areas/issues of concern, and prepare photo journal for reference and monitoring

Report any significant issues and required maintenance actions to Sr. Park Ranger at Riley Wilderness Park

Sheet Pile No. 3 - Page 2 of 6 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Sheet Pile No. 3 - Between Vela Ct. and Sandy Knoll (Continued) Descriptions of observations checked [Y] above: (add additional pages if needed)

Corrective measures implemented since last inspection: (add additional pages if needed)

Location(s) and description(s) of required maintenance or corrective/preventative measures: (add additional pages if needed)

Sheet Pile No. 3 - Page 3 of 6 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Sheet Pile No. 3 - Between Vela Ct. and Sandy Knoll (Continued) Photo Journal Sheet Pile No. 3 - Between Vela Ct. and Sandy Knoll (add additional pages if needed) 1. Sheet Pile Date: Insert photo/s here Comment:

2. Riprap along Toe of Slope and on the Banks, if applicable Date: Insert photo/s here Comments:

3. Riprap Upstream and Downstream of Control Structure, if applicable Date: Insert photo/s here Comments:

4. Riparian Planting/Revegetation Date: Insert photo/s here Comments:

5. Non-native and Invasive Plants Date: Insert photo/s here Comments:

Sheet Pile No. 3 - Page 4 of 6 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Sheet Pile No. 3 - Between Vela Ct. and Sandy Knoll (Continued) Photo Journal (Continued) Sheet Pile No. 3 - Between Vela Ct. and Sandy Knoll (add additional pages if needed) 6. Water Flow Date: Insert photo/s here Comments:

7. Groundwater Date: Insert photo/s here Comments:

8. Channel Geometry and Profile Date: Insert photo/s here Comment:

9. Weather Date: Insert photo/s here Comments:

10. Other Date: Insert photo/s here Comments:

Sheet Pile No. 3 - Page 5 of 6 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Sheet Pile No. 3 - Between Vela Ct. and Sandy Knoll (Continued) Additional Notes:

Sheet Pile No. 3 - Page 6 of 6 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Area 5 Inspection Checklist (Upstream of Oak Canyon Creek) Objective: The purpose of this improvement is to stabilize the channel invert against the high velocity flows and prevent channel downcutting. Inspector’s Name(s)/Title(s): Date: 1. Check Dam/Grade Control/ Invert Control (Section 5109) Y N N/A Structure appears to have been damaged Stones are missing or displaced Scour holes have formed downstream and undermined the control structure (toe of the riprap slope is exposed) Riprap bank protection has been eroded or disintegrated from the riprap stones on the bottom Flow direction changed due to vegetation, debris, sediments or entrenchment Elevation drop has been reduced (i.e., there are signs of sediment accumulation in the channel downstream of the control) Displaced rocks found downstream of the structure There has been displacement of rocks placed downstream of the structure 2. Riprap upstream and downstream of Control Structure Y N N/A The stones are clogged with debris and/or sediments The stones and/or bank riprap materials are displaced or disintegrated Gaps have formed between the stones and control structure Filter layer (fabric or gravel) is exposed or damaged 3. Riprap Bank Protection Y N N/A Stones are clogged with debris and/or sediment Stones are missing or have been misplaced Riprap has been undermined or bank is slumping Filter fabric is exposed or damaged 4. Channel Geometry and Profile Y N N/A There has been a noticeable change to channel section geometry There has been widening of the right bank There has been widening of the left bank Sloughing has occurred along channel bank (i.e., there is slough material present along the toe of slope) A channel discontinuity has formed (i.e., a sudden drop along the channel bed) There is noticeable lowering of the channel bed Channel low flow line has altered A new channel low flow line has formed 5. Riparian Planting/Revegetation Y N N/A Plantings appear to be receiving insufficient irrigation Off-trail visitor use has resulted in the trampling of vegetation Ground cover is sparse and not in good condition Density seems to be too high that may affect channel capacity

Area 5 - Page 1 of 6 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Area 5 - Upstream of Oak Canyon Creek (Continued) 6. Non-native and Invasive Plants Y N N/A Invasive or non-native vegetation is present Non-native or invasive plants appear to be stabilizing the banks or bed (if yes, removal must be carefully planned) 7. Water Flow Y N N/A There is water flow present in the main channel There is water flow from the tributaries or lateral drain There is evidence of lateral water flow since last inspection 8. Groundwater Y N N/A There is evidence of soil moisture on the bank There is visible groundwater seepage 9. Weather Y N N/A Substantial rainfall occurred at the time of inspection Substantial rainfall occurred since the last inspection 10. Other Y N N/A There is a condition causing substantial visible contrast to normal conditions Large woody debris, fallen trees, or sediments appear to be obstructing creek flow or posing a threat Dumping has been observed Uncontrolled creek access or trampling has created a potential erosion problem Large blockages are present that are too large to remove by hand Fencing is damaged or in need of repair There is evidence of graffiti of other vandalism Trail, interpretive, informational, and/or regulatory signage is damaged or missing

OVERALL CONDITION: Excellent Good Fair Poor

For any [Y] response above, describe observations and necessary corrective actions on the following page

Photograph observed areas/issues of concern, and prepare photo journal for reference and monitoring

Report any significant issues and required maintenance actions to Sr. Park Ranger at Riley Wilderness Park

Area 5 - Page 2 of 6 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Area 5 - Upstream of Oak Canyon Creek (Continued) Descriptions of observations checked “Y” above: (add additional pages if needed)

Corrective measures implemented since last inspection: (add additional pages if needed)

Location(s) and description(s) of potential corrective/preventative measures: (add additional pages if needed)

Area 5 - Page 3 of 6 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Area 5 - Upstream of Oak Canyon Creek (Continued) Photo Journal Area 5 - Upstream of Oak Canyon Creek -(add additional pages if needed) 1. Check Dam/Grade Control/ Invert Control (Section 5109) Date: Insert photo/s here Comment:

2. Riprap upstream and downstream of Control Structure Date: Insert photo/s here Comments:

3. Riprap Bank Protection Date: Insert photo/s here Comments:

4. Channel Geometry and Profile Date: Insert photo/s here Comments:

5. Riparian Planting/Revegetation Date: Insert photo/s here Comments:

Area 5 - Page 4 of 6 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Area 5 - Upstream of Oak Canyon Creek (Continued) Photo Journal (Continued) Area 5 - Upstream of Oak Canyon Creek -(add additional pages if needed) 7. Water Flow Date: Insert photo/s here Comments:

8. Groundwater Date: Insert photo/s here Comment:

9. Weather Date: Insert photo/s here Comments:

10. Other Date: Insert photo/s here Comments:

11. Other Date: Insert photo/s here Comments:

Area 5 - Page 5 of 6 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Area 5 - Upstream of Oak Canyon Creek (Continued) Additional Notes:

Area 5 - Page 6 of 6 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Area 6 Inspection Checklist (Near Park Ranger Station) Objective: The objectives for improvements within Area 6 are to (1) repair the damaged channel to the interim protection level, (2) realign the low-flow channel to reduce west bank failure, and (3) confine creek flow near the park entrance road crossing to reduce flooding and sedimentation. These improvements will serve to improve the overall hydraulic performance of the reach. Inspector’s Name(s)/Title(s): Date: 1. Invert Control/Drop Structure (Section 5710) Y N N/A Structure appears to have been damaged Stones are missing or displaced Scour holes have formed downstream and undermined the control structure (toe of the riprap slope is exposed) Riprap bank protection has been eroded or disintegrated from the riprap stones on the bottom Flow direction changed due to vegetation, debris, sediments or entrenchment Elevation drop has been reduced, i.e., there are signs of sediment accumulation in the channel downstream of the control Displaced rocks were found downstream of the structure 2. Riprap along Channel Bottom Y N N/A Stones are clogged with debris and/or sediments Stones and/or bank riprap materials are displaced or disintegrated Gaps have formed between the stones and control structures Filter layer (fabric or gravel) is exposed or damaged 3. Existing Banks Y N N/A Concrete grout is missing Rocks and stones are loose or missing Riprap bank protection has been disintegrated from the riprap stones on the bottom 4. Invert Control/Drop Structure (Section 5840) Y N N/A Structure appears to have been damaged Stones are missing or displaced Scour holes have formed downstream and undermined the control structure (toe of the riprap slope is exposed) Riprap bank protection has been eroded or disintegrated from the riprap stones on the bottom Flow direction changed due to vegetation, debris, sediments or entrenchment Elevation drop has been reduced, i.e., there are signs of sediment accumulation in the channel downstream of the control Displaced rocks were found downstream of the structure 5. Riprap Bank Protection, if applicable Y N N/A Stones are clogged with debris and/or sediment Stones are missing or have been misplaced Riprap has been undermined or bank is slumping Filter layer (fabric or gravel) is exposed or damaged

Area 6 - Page 1 of 8 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Area 6 – Near Park Ranger Station (Continued) 6. Derrick Stone or Riprap along Toe of Slope Y N N/A Stones are clogged with debris and/or sediment Stones are missing or have been misplaced Riprap has been undermined or bank is slumping Filter fabric is exposed or damaged 7. Earthen Berm Y N N/A Earthen berm has been lowered and eroded. Earthen berm is covered with sediment Plants covering the berm have not been established Animal burrows are present along the berm. 8. Drainage Crossing and Culvert (under the Entrance Road) Y N N/A Sediments were observed upstream of the culvert Sediments were observed under the culvert Sediments were observed downstream of the culvert Sediments were observed on the roadway above the culvert Vegetation debris blockage or potential blockage were observed Signs of flow breakout upstream of the culvert were observed There is evidence of erosion underneath or around the culvert Entrance road has potholes and/or depressions (even minor depressions can pond water and lead to erosion) 9. Channel Geometry and Profile Y N N/A There has been a noticeable change to channel section geometry There has been widening of the right bank There has been widening of the left bank Sloughing has occurred along channel bank (i.e., there is slough material present along the toe of slope) A channel discontinuity has formed (i.e., a sudden drop along the channel bed) There is noticeable lowering of the channel bed Channel low flow line has altered A new channel low flow line has formed 10. Riparian Planting/Revegetation Y N N/A Plantings appear to be receiving insufficient irrigation Off-trail visitor use has resulted in the trampling of vegetation Ground cover is sparse and not in good condition Density seems to be too high that may affect channel capacity 11. Non-native and Invasive Plants Y N N/A Invasive or non-native vegetation is present Non-native or invasive plants appear to be stabilizing the banks or bed (if yes, removal must be carefully planned)

Area 6 - Page 2 of 8 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Area 6 – Near Park Ranger Station (Continued) 12. Water Flow Y N N/A There is water flow present in the main channel There is water flow from the tributaries or lateral drain There is evidence of lateral water flow since last inspection 13. Groundwater Y N N/A There is evidence of soil moisture on the bank There is visible groundwater seepage 14. Weather Y N N/A Substantial rainfall occurred at the time of inspection Substantial rainfall has occurred since the last inspection 15. Other Y N N/A There is a condition causing substantial visible contrast to normal conditions There is a condition causing substantial visible contrast to normal conditions Large woody debris, fallen trees, or sediments appear to be obstructing creek flow or posing a threat Dumping has been observed Uncontrolled creek access or trampling has created a potential erosion problem Large blockages are present that are too large to remove by hand Fencing is damaged or in need of repair There is evidence of graffiti of other vandalism Trail, interpretive, informational , and/or regulatory signage is damaged or missing

OVERALL CONDITION: Excellent Good Fair Poor

For any [Y] response above, describe observations and necessary corrective actions on the following page

Photograph observed areas/issues of concern, and prepare photo journal for reference and monitoring

Report any significant issues and required maintenance actions to Sr. Park Ranger at Riley Wilderness Park

Area 6 - Page 3 of 8 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Area 6 – Near Park Ranger Station (Continued) Descriptions of observations checked [Y] above: (add additional pages if needed)

Corrective measures implemented since last inspection: (add additional pages if needed)

Location(s) and description(s) of required maintenance or corrective/preventative measures: (add additional pages if needed)

Area 6 - Page 4 of 8 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Area 6 – Near Park Ranger Station (Continued) Photo Journal Area 6 – Near Park Ranger Station -(add additional pages if needed) 1. Invert Control/Drop Structure (Section 5710) Date: Insert photo/s here Comment:

2. Riprap along Channel Bottom Date: Insert photo/s here Comments:

3. Existing Banks Date: Insert photo/s here Comments:

4. Invert Control/Drop Structure (Section 5840) Date: Insert photo/s here Comments:

5. Riprap Bank Protection, if applicable Date: Insert photo/s here Comments:

Area 6 - Page 5 of 8 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Area 6 – Near Park Ranger Station (Continued) Photo Journal (Continued) Area 6 – Near Park Ranger Station (add additional pages if needed) 6. Derrick Stone or Riprap along Toe of Slope Date: Insert photo/s here Comments:

7. Earthen Berm Date: Insert photo/s here Comments:

8. Drainage Crossing and Culvert (under the Entrance Road) Date: Insert photo/s here Comment:

9. Channel Geometry and Profile Date: Insert photo/s here Comments:

10. Riparian Planting/Revegetation Date: Insert photo/s here Comments:

Area 6 - Page 6 of 8 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Area 6 – Near Park Ranger Station (Continued) Photo Journal (Continued) Area 6 – Near Park Ranger Station (add additional pages if needed) 11. Non-native and Invasive Plants Date: Insert photo/s here Comments:

12. Water Flow Date: Insert photo/s here Comments:

13. Groundwater Date: Insert photo/s here Comment:

14. Weather Date: Insert photo/s here Comments:

15. Other Date: Insert photo/s here Comments:

Area 6 - Page 7 of 8 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Area 6 – Near Park Ranger Station (Continued) Additional Notes:

Area 6 - Page 8 of 8 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Area 7 Inspection Checklist (Oso Parkway Culvert) Objective: The objectives for improvements to the lateral drainage are to (1) control the outflow from the Oso Parkway culvert, (2) restore the eroded bank and trail, and (3) provide stabilization at the flow outlet Inspector’s Name(s)/Title(s): Date: 1. Concrete Weir Y N N/A The concrete edge is exposed and subject to flow erosion The concrete weir is cracked or damaged The concrete weir has been undermined Sediments were observed on the concrete surface 2. Underdrain and Gravel Seepage Sump Y N N/A Underdrain below the concrete weir is blocked Gravel sump above the concrete weir is covered by minor debris or sediments Gravel sump is completely covered by sediments Gravels are displaced 3. Derrick Stone/Riprap Downstream of Concrete Weir at the Flow Outlet Y N N/A The stones are clogged with debris and/or sediments The stones and/or bank riprap materials are displaced and disintegrated from the weir structure Filter layers (gravels or fabric) is exposed or damaged Stones are missing or have been misplaced Riprap has been undermined or bank is slumping Filter fabric is exposed or damaged 4. Riparian Planting/Revegetation Y N N/A Plantings appear to be receiving insufficient irrigation Off-trail visitor use has resulted in the trampling of vegetation Ground cover is sparse and not in good condition Density seems to be too high that may affect channel capacity 5. Non-native and Invasive Plants Y N N/A Invasive or non-native vegetation is present Non-native or invasive plants appear to be stabilizing the banks or bed (if yes, removal must be carefully planned) 6. Channel Geometry and Profile Y N N/A There has been a noticeable change to channel section geometry There has been widening of the right bank There has been widening of the left bank Sloughing has occurred along channel bank (i.e., there is slough material present along the toe of slope) A channel discontinuity has formed (i.e., a sudden drop along the channel bed) There is noticeable lowering of the channel bed Channel low flow line has altered A new channel low flow line has formed

Area 7 - Page 1 of 6 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Area 7 - Oso Parkway Culvert (Continued) 7. Water Flow Y N N/A There is water flow present in the main channel There is water flow from the tributaries or lateral drain There is evidence of lateral water flow since last inspection 8. Groundwater Y N N/A There is evidence of soil moisture on the bank There is visible groundwater seepage 9. Weather Y N N/A Substantial rainfall occurred at the time of inspection Substantial rainfall has occurred since the last inspection 10. Other Y N N/A There is a condition causing substantial visible contrast to normal conditions Large woody debris, fallen trees, or sediments appear to be obstructing creek flow or posing a threat Dumping has been observed Uncontrolled creek access or trampling has created a potential erosion problem Large blockages are present that are too large to remove by hand Fencing is damaged or in need of repair There is evidence of graffiti of other vandalism Trail, interpretive, informational, and/or regulatory signage is damaged or missing

OVERALL CONDITION: Excellent Good Fair Poor

For any [Y] response above, describe observations and necessary corrective actions on the following page

Photograph observed areas/issues of concern, and prepare photo journal for reference and monitoring

Report any significant issues and required maintenance actions to Sr. Park Ranger at Riley Wilderness Park

Area 7 - Page 2 of 6 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Area 7 - Oso Parkway Culvert (Continued) Descriptions of observations checked [Y] above: (add additional pages if needed)

Corrective measures implemented since last inspection: (add additional pages if needed)

Location(s) and description(s) of required maintenance or corrective/preventative measures: (add additional pages if needed)

Area 7 - Page 3 of 6 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Area 7 - Oso Parkway Culvert (Continued) Photo Journal Area 7 - Oso Parkway Culvert - (add additional pages if needed) 1. Concrete Weir Date: Insert photo/s here Comment:

2. Underdrain and Gravel Seepage Sump Date: Insert photo/s here Comments:

3. Derrick Stone/Riprap Downstream of Concrete Weir at the Flow Outlet Date: Insert photo/s here Comments:

4. Riparian Planting/Revegetation Date: Insert photo/s here Comments:

5. Non-native and Invasive Plants Date: Insert photo/s here Comments:

Area 7 - Page 4 of 6 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Area 7 - Oso Parkway Culvert (Continued) Photo Journal (Continued) Area 7 - Oso Parkway Culvert - (add additional pages if needed) 6. Channel Geometry and Profile Date: Insert photo/s here Comments:

7. Water Flow Date: Insert photo/s here Comments:

8. Groundwater Date: Insert photo/s here Comment:

9. Weather Date: Insert photo/s here Comments:

10. Other Date: Insert photo/s here Comments:

Area 7 - Page 5 of 6 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Area 7 - Oso Parkway Culvert (Continued) Additional Notes:

Area 7 - Page 6 of 6 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Downstream & Upstream of Area 7 Inspection Checklist (Entrenched Sections) Objective: The purpose of this improvement is to control the channel invert and hydraulic conditions to prevent further downcutting and severe widening (which may result in the same problem as Area 8). Inspector’s Name(s)/Title(s): Date: 1. Invert Control/Grade Control (Section 7461) Y N N/A Structure appears to have been damaged Stones are missing or displaced Scour holes have formed downstream and undermined the control structure (toe of the riprap slope is exposed) Riprap bank protection has been eroded or disintegrated from the riprap stones on the bottom Flow direction changed due to vegetation, debris, sediments or entrenchment Elevation drop has been reduced (i.e., there are signs of sediment accumulation in the channel downstream of the control) Displaced rocks were found downstream of the structure There has been displacement of rocks placed downstream of the structure 2. Invert Control/Grade Control (Section 7853) Y N N/A Structure appears to have been damaged Stones are missing or displaced Scour holes have formed downstream and undermined the control structure (toe of the riprap slope is exposed) Riprap bank protection has been eroded or disintegrated from the riprap stones on the bottom Flow direction changed due to vegetation, debris, sediments or entrenchment Elevation drop has been reduced (i.e., there are signs of sediment accumulation in the channel downstream of the control) Displaced rocks were found downstream of the structure There has been displacement of rocks placed downstream of the structure 3. Invert Control/Grade Control (Section 8270) Y N N/A Structure appears to have been damaged Stones are missing or displaced Scour holes have formed downstream and undermined the control structure (toe of the riprap slope is exposed) Riprap bank protection has been eroded or disintegrated from the riprap stones on the bottom Flow direction changed due to vegetation, debris, sediments or entrenchment Elevation drop has been reduced (i.e., there are signs of sediment accumulation in the channel downstream of the control Displaced rocks found downstream of the structure There has been displacement of rocks placed downstream of the structure

Downstream & Upstream of Area 7 - Page 1 of 8 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Downstream & Upstream of Area 7 - Entrenched Sections (Continued) 4. Invert Control/Grade Control (Section 8645) Y N N/A Structure appears to have been damaged Stones are missing or displaced Scour holes have formed downstream and undermined the control structure (toe of the riprap slope is exposed) Riprap bank protection has been eroded or disintegrated from the riprap stones on the bottom Flow direction changed due to vegetation, debris, sediments or entrenchment Elevation drop has been reduced (i.e., there are signs of sediment accumulation in the channel downstream of the control) Displaced rocks were found downstream of the structure There has been displacement of rocks placed downstream of the structure 5. Invert Control/Grade Control (Section 8843) Y N N/A Structure appears to have been damaged Stones are missing or displaced Scour holes have formed downstream and undermined the control structure (toe of the riprap slope is exposed) Riprap bank protection has been eroded or disintegrated from the riprap stones on the bottom Flow direction changed due to vegetation, debris, sediments or entrenchment Elevation drop has been reduced (i.e., there are signs of sediment accumulation in the channel downstream of the control Displaced rocks were found downstream of the structure There has been displacement of rocks placed downstream of the structure 6. Riprap Upstream and Downstream of Control Structure Y N N/A Stones are clogged with debris and/or sediment Stones are missing or have been misplaced Gaps have formed between the stones and control structure Filter layer (fabric or gravel) is exposed or damaged 7. Derrick Stones or Riprap along Toe of Slope, if applicable Y N N/A Stones are clogged with debris and/or sediment Stones are missing or have been misplaced Riprap has been undermined or bank is slumping Filter fabric is exposed or damaged 8. Riprap Bank Protection, if applicable Y N N/A Stones are clogged with debris and/or sediment Stones are missing or have been misplaced Riprap has been undermined or bank is slumping Filter layer (fabric or gravel) is exposed or damaged

Downstream & Upstream of Area 7 - Page 2 of 8 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Downstream & Upstream of Area 7 - Entrenched Sections(Continued) 9. Channel Geometry and Profile Y N N/A There has been a noticeable change to channel section geometry There has been widening of the right bank There has been widening of the left bank Sloughing has occurred along channel bank (i.e., slough material is present along the toe of slope)( A channel discontinuity has formed (i.e., a sudden drop along the channel bed) There is noticeable lowering of the channel bed Channel low flow line has altered A new channel low flow line has formed 10. Riparian Planting/Revegetation Y N N/A Plantings appear to be receiving insufficient irrigation Off-trail visitor use has resulted in the trampling of vegetation Ground cover is sparse and not in good condition Density seems to be too high that may affect channel capacity 11. Non-native and Invasive Plants Y N N/A Invasive or non-native vegetation is present Non-native or invasive plants appear to be stabilizing the banks or bed (if yes, removal must be carefully planned) 12. Water Flow Y N N/A There is water flow present in the main channel There is water flow from the tributaries or lateral drain There is evidence of lateral water flow since last inspection 13. Groundwater Y N N/A There is evidence of soil moisture on the bank There is visible groundwater seepage 14. Weather Y N N/A Substantial rainfall occurred at the time of inspection Substantial rainfall has occurred since the last inspection 15. Other Y N N/A There is a condition causing substantial visible contrast to normal conditions Large woody debris, fallen trees, or sediments appear to be obstructing creek flow or posing a threat Dumping has been observed Uncontrolled creek access or trampling has created a potential erosion problem Large blockages are present that are too large to remove by hand Fencing is damaged or in need of repair There is evidence of graffiti of other vandalism Trail, interpretive, informational, and/or regulatory signage is damaged or missing

OVERALL CONDITION: Excellent Good Fair Poor

For any [Y] response above, describe observations and necessary corrective actions on the following page

Photograph observed areas/issues of concern, and prepare photo journal for reference and monitoring

Report any significant issues and required maintenance actions to Sr. Park Ranger at Riley Wilderness Park

Downstream & Upstream of Area 7 - Page 3 of 8 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Downstream & Upstream of Area 7 - Entrenched Sections (Continued) Descriptions of observations checked [Y] above: (add additional pages if needed)

Corrective measures implemented since last inspection: (add additional pages if needed)

Location(s) and description(s) of required maintenance or corrective/preventative measures: (add additional pages if needed)

Downstream & Upstream of Area 7 - Page 4 of 8 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Downstream & Upstream of Area 7 - Entrenched Sections (Continued) Photo Journal Downstream & Upstream of Area 7 - Entrenched Sections 1. Invert Control/Grade Control (Section 7461) Date: Insert photo/s here Comment:

2. Invert Control/Grade Control (Section 7853) Date: Insert photo/s here Comments:

3. Invert Control/Grade Control (Section 8270) Date: Insert photo/s here Comments:

4. Invert Control/Grade Control (Section 8645) Date: Insert photo/s here Comments:

5. Invert Control/Grade Control (Section 8843) Date: Insert photo/s here Comments:

Downstream & Upstream of Area 7 - Page 5 of 8 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Downstream & Upstream of Area 7 - Entrenched Sections (Continued) Photo Journal (Continued) Downstream & Upstream of Area 7 - Entrenched Sections (add additional pages if needed) 6. Riprap Upstream and Downstream of Control Structure Date: Insert photo/s here Comments:

7. Derrick Stones or Riprap along Toe of Slope, if applicable Date: Insert photo/s here Comments:

8. Riprap Bank Protection, if applicable Date: Insert photo/s here Comment:

9. Channel Geometry and Profile Date: Insert photo/s here Comments:

10. Riparian Planting/Revegetation Date: Insert photo/s here Comments:

Downstream & Upstream of Area 7 - Page 6 of 8 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Downstream & Upstream of Area 7 - Entrenched Sections (Continued) Photo Journal (Continued) Downstream & Upstream of Area 7 - Entrenched Sections (add additional pages if needed) 11. Non-native and Invasive Plants Date: Insert photo/s here Comments:

12. Water Flow Date: Insert photo/s here Comments:

13. Groundwater Date: Insert photo/s here Comment:

14. Weather Date: Insert photo/s here Comments:

15. Other Date: Insert photo/s here Comments:

Downstream & Upstream of Area 7 - Page 7 of 8 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Downstream & Upstream of Area 7 - Entrenched Sections (Continued) Additional Notes:

Downstream & Upstream of Area 7 - Page 8 of 8 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Area 8 Inspection Checklist (Wide Area Sections) Objective: The objectives for Area 8 improvements are to (1) provide toe erosion control; (2) increase the favorable hydraulic and sediment transport conditions, providing a basis for the creek to reestablish a new ecology within the widened and deepened gully, and (3) confine the lateral flow within the concrete ditch along the Oso Parkway, preventing further bank erosion. Inspector’s Name(s)/Title(s): Date: OPTIONAL. Grade Control/Drop Structures Y N N/A Structure appears to have been damaged Stones are missing or displaced Scour holes have formed downstream and undermined the control structure (toe of the riprap slope is exposed) Riprap bank protection has been eroded or disintegrated from the riprap stones on the bottom Flow direction changed due to vegetation, debris, sediments or entrenchment Elevation drop has been reduced (i.e., there are signs of sediment accumulation in the channel downstream of the control) Displaced rocks were found downstream of the structure OPTIONAL. Derrick Stones and/or Riprap upstream and downstream of the Control Structures Y N N/A The stones are clogged with debris and/or sediments The stones and/or bank riprap materials are displaced or disintegrated Gaps have formed between the stones and sheet pile Filter layer (fabric or gravel) is exposed or damaged 1. Derrick Stone along Toe of Slope Y N N/A Stones are clogged with debris and/or sediment Stones are missing or have been misplaced Riprap has been undermined or bank is slumping Filter fabric is exposed or damaged 2. Riprap along Channel Bottom Y N N/A Stones are clogged with debris and/or sediments Disintegration among stones and existing bank protection Filter fabric is exposed, missing, or damaged 3. Earthen Berm/DG Trail &Concrete Ditch Y N N/A Earthen berm has been lowered and eroded Earthen berm is covered with sediment Erosion control (rock or vegetation) is damaged or missing Animal burrows are present along the berm There are signs undermining along edges of concrete ditch Cracks or disintegration are visible in concrete There are signs of flow from concrete ditch overtopping the berm Sediment is present in concrete ditch Decomposed granite surface has been affected by water flows Shallow ruts, pot holes, or other depressions that may pond water have formed along surface of berm/trail

Area 8 - Page 1 of 6 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Area 8 - Wide Area Sections (Continued) 4. Channel Geometry and Profile Y N N/A There has been a noticeable change to channel section geometry There has been widening of the right bank There has been widening of the left bank Sloughing has occurred along channel bank (i.e., there is slough material present along the toe of slope) A channel discontinuity has formed (i.e., a sudden drop along the channel bed) There is noticeable lowering of the channel bed Channel low flow line has altered A new channel low flow line has formed 5. Riparian Planting/Revegetation Y N N/A Plantings appear to be receiving insufficient irrigation Off-trail visitor use has resulted in the trampling of vegetation Ground cover is sparse and not in good condition Density seems to be too high that may affect channel capacity Roots of in-channel plantings have been exposed by creek flow There does not appear to be sufficient flow in the channel (or from other sources, such as locally high groundwater) to support in-channel vegetation 6. Non-native and Invasive Plants Y N N/A Invasive or non-native vegetation is present Non-native or invasive plants appear to be stabilizing the banks or bed (if yes, removal must be carefully planned) 7. Water Flow Y N N/A There is water flow present in the main channel There is water flow from the tributaries or lateral drain There is evidence of lateral water flow since last inspection 8. Groundwater Y N N/A There is evidence of soil moisture on the bank There is visible groundwater seepage 9. Weather Y N N/A Substantial rainfall occurred at the time of inspection Substantial rainfall has occurred since the last inspection 10. Other Y N N/A There is a condition causing substantial visible contrast to normal conditions Large woody debris, fallen trees or sediments appear to be obstructing creek flow or posing a threat Dumping has been observed Uncontrolled creek access or trampling created a potential erosion problem Large blockages are present that are too large to remove by hand Fencing is damaged or in need of repair There is evidence of graffiti of other vandalism Trail, interpretive, informational, and/or regulatory signage is damaged or missing

OVERALL CONDITION: Excellent Good Fair Poor

For any [Y] response above, describe observations and necessary corrective actions on the following page

Photograph observed areas/issues of concern, and prepare photo journal for reference and monitoring

Report any significant issues and required mainteAnraean c8e - aPagection 2s ofto 6S r. Park Ranger at Riley Wilderness Park Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Area 8 - Wide Area Sections (Continued) Descriptions of observations checked [Y]above: (add additional pages if needed)

Corrective measures implemented since last inspection: (add additional pages if needed)

Location(s) and description(s) of required maintenance or corrective/preventative measures: (add additional pages if needed)

Area 8 - Page 3 of 6 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Area 8 - Wide Area Sections (Continued) Photo Journal Area 8 - Wide Area Sections (add additional pages if needed) OPTIONAL Feature: Date: Grade Control/Drop Structures Insert photo/s here Comment:

OPTIONAL Features: Date: Derrick Stones and/or Riprap upstream and downstream of the Control Structures Insert photo/s here Comments:

1. Derrick Stone along Toe of Slope Date: Insert photo/s here Comments:

2. Riprap along Channel Bottom Date: Insert photo/s here Comments:

3. Earthen Berm/DG Trail &Concrete Ditch Date: Insert photo/s here Comments:

Area 8 - Page 4 of 6 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Area 8 - Wide Area Sections (Continued) Photo Journal Area 8 - Wide Area Sections (add additional pages if needed) 4. Channel Geometry and Profile Date: Insert photo/s here Comments:

5. Riparian Planting/Revegetation Date: Insert photo/s here Comments:

6. Non-native and Invasive Plants Date:

Insert photo/s here Comment:

7. Water Flow Date: Insert photo/s here Comments:

8. Groundwater Date: Insert photo/s here Comments:

Area 8 - Page 5 of 6 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Area 8 - Wide Area Sections (Continued) Photo Journal Area 8 - Wide Area Sections (add additional pages if needed) 9. Weather Date: Insert photo/s here Comments:

10. Other Date: Insert photo/s here Comments:

11. Other Date: Insert photo/s here Comment:

12. Other Date: Insert photo/s here Comments:

13. Other Date: Insert photo/s here Comments:

Area 8 - Page 6 of 6 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Area 9 Inspection Checklist (Downstream of Pedestrian Bridge) Objective: Area 9 involves steep reach and discontinuity in channel profile. The improvements are intended to control the invert elevations, prevent headcut erosion and stabilize the bridge structure. Inspector’s Name(s)/Title(s): Date: 1. Sheet Pile Drop Structure (Section 9432) Y N N/A Looking across the channel and viewing the sheet pile in section view, the panels appear to be bent Viewing the downstream face of the sheet pile, the panels have become separated or dislodged There has been displacement of rocks placed downstream of the sheet pile Soils in contact with the sheet piles are lost Flow direction changed due to vegetation, debris, sediments, or entrenchment Elevation drop has been reduced (i.e., there are signs of sediment accumulation in the channel downstream of the sheet pile) 2. Derrick Stones or Riprap upstream and downstream of Sheet Piles Y N N/A Stones are clogged with debris and/or sediments Stones and/or bank riprap materials are displaced or disintegrated Gaps have formed between the stones and control structure Filter layer (fabric or gravel) is exposed or damaged 3. Sheet Pile Drop Structure (Section 9442) Y N N/A Looking across the channel and viewing the sheet pile in section view, the panels appear to be bent Viewing the downstream face of the sheet pile, the panels have become separated or dislodged There has been displacement of rocks placed downstream of the sheet pile Soils in contact with the sheet piles are lost Flow direction changed due to vegetation, debris, sediments, or entrenchment Elevation drop has been reduced (i.e., there are signs of sediment accumulation in the channel downstream of the sheet pile) 4. Derrick Stones or Riprap along Toe of Slope Y N N/A Stones are clogged with debris and/or sediment Stones are missing or have been misplaced Riprap has been undermined or bank is slumping Filter fabric is exposed or damaged 5. Riprap along Channel Bottom Y N N/A Stones are clogged with debris and/or sediments Disintegration among stones and existing bank protection Filter fabric is exposed, missing, or damaged 6. Invert Control/ Grade Control (Section 9449) Y N N/A Structure appears to have been damaged Stones are missing or displaced Scour holes have formed downstream and undermined the control structure (toe of the riprap slope is exposed) Riprap bank protection has been eroded or disintegrated from the riprap stones on the bottom Flow direction changed due to vegetation, debris, sediments or entrenchment Elevation drop has been reduced (i.e., there are signs of sediment accumulation in the channel downstream of the control) Displaced rocks were found downstream of the structure There has been displacement of rocks placed downstream of the structure

Area 9 - Page 1 of 8 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Area 9 - Downstream of Pedestrian Bridge (Continued) 7. Invert Control/ Grade Control (Section 9504) Y N N/A Structure appears to have been damaged Stones are missing or displaced Scour holes have formed downstream and undermined the control structure (toe of the riprap slope is exposed) Riprap bank protection has been eroded or disintegrated from the riprap stones on the bottom Flow direction changed due to vegetation, debris, sediments or entrenchment Elevation drop has been reduced (i.e., there are signs of sediment accumulation in the channel downstream of the control) Displaced rocks were found downstream of the structure There has been displacement of rocks placed downstream of the structure 8. Invert Control/ Grade Control/Drop Structure (Section 9562) Y N N/A Structure appears to have been damaged Stones are missing or displaced Scour holes have formed downstream and undermined the control structure (toe of the riprap slope is exposed) Riprap bank protection has been eroded or disintegrated from the riprap stones on the bottom Flow direction changed due to vegetation, debris, sediments or entrenchment Elevation drop has been reduced, i.e., there are signs of sediment accumulation in the channel downstream of the control Displaced rocks found downstream of the structure 9. Invert Control/ Grade Control (Section 9645) Y N N/A Structure appears to have been damaged Stones are missing or displaced Scour holes have formed downstream and undermined the control structure (toe of the riprap slope is exposed) Riprap bank protection has been eroded or disintegrated from the riprap stones on the bottom Flow direction changed due to vegetation, debris, sediments or entrenchment Elevation drop has been reduced (i.e., there are signs of sediment accumulation in the channel downstream of the control) Displaced rocks found downstream of the structure There has been displacement of rocks placed downstream of the structure 10. Grade Control/Drop Structure (Section 9693) Y N N/A Structure appears to have been damaged Stones are missing or displaced Scour holes have formed downstream and undermined the control structure (toe of the riprap slope is exposed) Riprap bank protection has been eroded or disintegrated from the riprap stones on the bottom Flow direction changed due to vegetation, debris, sediments or entrenchment Elevation drop has been reduced (i.e., there are signs of sediment accumulation in the channel downstream of the control) Displaced rocks found downstream of the structure

Area 9 - Page 2 of 8 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Area 9 - Downstream of Pedestrian Bridge (Continued) 11. Grade Control/Drop Structure (Section 9730) Y N N/A Structure appears to have been damaged Stones are missing or displaced Scour holes have formed downstream and undermined the control structure (toe of the riprap slope is exposed) Riprap bank protection has been eroded or disintegrated from the riprap stones on the bottom Flow direction changed due to vegetation, debris, sediments or entrenchment Elevation drop has been reduced (i.e., there are signs of sediment accumulation in the channel downstream of the control) Displaced rocks found downstream of the structure 12. Riprap Upstream and Downstream of Control Structure Y N N/A Stones are clogged with debris and/or sediment Stones are missing or have been misplaced Gaps formed between the stones and control structure Filter layer (fabric or gravel) is exposed or damaged 13. Riprap Bank Protection Y N N/A Stones are clogged with debris and/or sediment Stones are missing or have been misplaced Riprap has been undermined or bank is slumping Filter layer (fabric or gravel) is exposed or damaged 14. Riparian Planting/Revegetation Y N N/A Plantings appear to be receiving insufficient irrigation Off-trail visitor use has resulted in the trampling of vegetation Ground cover is sparse and not in good condition Density seems to be too high that may affect channel capacity 15. Non-native and Invasive Plants Y N N/A Invasive or non-native vegetation is present Non-native or invasive plants appear to be stabilizing the banks or bed (if yes, removal must be carefully planned) 16. Channel Geometry and Profile Y N N/A There has been a noticeable change to channel section geometry There has been widening of the right bank A channel discontinuity has formed (i.e., a sudden drop along the channel bed) There has been widening of the left bank Sloughing has occurred along channel bank (i.e., there is slough material present along the toe of slope) There is noticeable lowering of the channel bed Channel low flow line has altered A new channel low flow line has formed 17. Groundwater Y N N/A There is evidence of soil moisture on the bank There is visible groundwater seepage 18. Water Flow Y N N/A There is water flow present in the main channel There is water flow from the tributaries or lateral drain There is evidence of lateral water flow since last inspection

Area 9 - Page 3 of 8 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Area 9 - Downstream of Pedestrian Bridge (Continued) 19. Weather Y N N/A Substantial rainfall occurred at the time of inspection Substantial rainfall has occurred since the last inspection 20. Other Y N N/A There is a condition causing substantial visible contrast to normal conditions Large woody debris, fallen trees, or sediments appear to be obstructing creek flow or posing a threat Has any observed dumping occurred Uncontrolled creek access or trampling has created a potential erosion problem There are large blockages present that are too large to remove by hand Fencing is damaged or in need of repair There is evidence of graffiti of other vandalism Trail, interpretive, informational , and/or regulatory signage is damaged or missing

OVERALL CONDITION: Excellent Good Fair Poor

For any [Y] response above, describe observations and necessary corrective actions on the following page

Photograph observed areas/issues of concern, and prepare photo journal for reference and monitoring

Report any significant issues and required maintenance actions to Sr. Park Ranger at Riley Wilderness Park

Area 9 - Page 4 of 8 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Area 9 - Downstream of Pedestrian Bridge (Continued) Descriptions of observations checked [Y] above: (add additional pages if needed)

Corrective measures implemented since last inspection: (add additional pages if needed)

Location(s) and description(s) of required maintenance or corrective/preventative measures: (add additional pages if needed)

Area 9 - Page 5 of 8 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Area 9 - Downstream of Pedestrian Bridge (Continued) Photo Journal Area 9 - Downstream of Pedestrian Bridge (add additional pages if needed) 1. Sheet Pile Drop Structure (Section 9432) Date: Insert photo/s here Comment:

2. Derrick Stones or Riprap upstream and downstream of Sheet Piles Date: Insert photo/s here Comments:

3. Sheet Pile Drop Structure (Section 9442) Date: Insert photo/s here Comments:

4. Derrick Stones or Riprap along Toe of Slope Date: Insert photo/s here Comments:

5. Riprap along Channel Bottom Date: Insert photo/s here Comments:

6. Invert Control/ Grade Control (Section 9449) Date: Insert photo/s here Comments:

Area 9 - Page 6 of 8 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Area 9 - Downstream of Pedestrian Bridge (Continued) Photo Journal (Continued) Area 9 - Downstream of Pedestrian Bridge (add additional pages if needed) 7. Invert Control/ Grade Control (Section 9504) Date:

Insert photo/s here Comments:

8. Invert Control/ Grade Control/Drop Structure (Section 9562) Date:

Insert photo/s here Comment:

9. Invert Control/ Grade Control (Section 9645) Date:

Insert photo/s here Comments:

10. Other Date:

Insert photo/s here Comments:

11. Other Date: Insert photo/s here Comments:

Area 9 - Page 7 of 8 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Area 9 - Downstream of Pedestrian Bridge (Continued) Additional Notes:

Area 9 - Page 8 of 8 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Area 11 Inspection Checklist (Stormwater Management) Objective: The objectives for the improvements within Area 11 are (1) to provide detention during periods of medium and high flows, (2) to allow for low flow, and (3) to provide an opportunity for enhanced water quality. Inspector’s Name(s)/Title(s) Date 1. Flow Control Berm Y N N/A Earthen berm appears to have been damaged Stones protecting earthen berm are missing or displaced Scour holes have formed downstream and undermined the berm (toe of the riprap slope is exposed) Low flow direction has changed due to vegetation, debris, sediments or entrenchment There are signs of sediment or debris accumulation upstream of the culvert Displaced rocks found downstream of the structure 2. Bypass Culvert Y N N/A Sediments were observed upstream of the culvert Sediments were observed under the culvert Sediments were observed downstream of the culvert Vegetation debris blockage or potential blockage were observed Signs of flow breakout upstream of the culvert was observed There is evidence of erosion underneath or around the culvert 3. Riprap Downstream of the Bypass Culvert Y N N/A Gaps have formed between the stones and the culvert outlet Stones are clogged with debris and/or sediments Filter layers (gravel or fabric) is exposed or damaged Stones are missing or have been misplaced Riprap pad has been undermined 4. Riprap Overflow Control Y N N/A Significant bank erosion has occurred since last inspection Riprap overflow control appears to have been damaged Stones are missing or displaced Scour holes have formed and undermined the bank There is evidence of overflow at other locations Displaced rocks found downstream of the structure 5. Riprap Downstream of Overflow Control Y N N/A Gaps have formed between the stones and control structure Stones are clogged with debris and/or sediments Filter layers (gravel or fabric) is exposed or damaged Stones are missing or have been misplaced Riprap pad has been undermined 6. Tributaries Downstream of Bank Overflow Y N N/A Loss of vegetation in the tributary channel has occurred since last inspection Loss of vegetation on the overbank area has occurred since last inspection Major erosion is evident along the tributaries Major erosion is evident at tributary confluence with Wagon Wheel Creek

Area 11 - Page 1 of 8 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Area 11 - Stormwater Management (Continued) 7. Gabion Baskets and Mats in Area 10 (Inspect only, no maintenance) Y N N/A Wire appears damaged or deteriorated Baskets/mats are no longer securely locked and integrated Gaps have formed between the filter layer and the baskets Vegetation growth has potential to damage gabions Stream flow has undercut gabions Erosion is observed behind or along the sides of gabions Gabions have shifted or appear to have lifted from the bank or channel bottom Bank or bed scour is observed adjacent to gabions 8. Wide Channel/Detention Area Y N N/A Major sedimentation has occurred Significant ponding of water is observed in dry weather Odor is emanating from ponding water Significant bank erosion has occurred since last inspection Loss of vegetation has occurred since last inspection 9. Riprap Downstream of the Oso Pkwy Culvert (Inspect only) Y N N/A Outlet structure appears to be damaged or eroded Gaps have formed between the stones and the culvert outlet Major sedimentation has occurred Significant ponding of water is observed in dry weather Odor is emanating from ponding water Trash or other debris is observed Riprap pad has been undermined 10. Riprap Bank Protection, if applicable Y N N/A Stones are clogged with debris and/or sediment Stones are missing or have been misplaced Riprap has been undermined or bank is slumping Filter layer (fabric or gravel) is exposed or damaged 11. Riparian Vegetation/Revegetation Y N N/A Plantings appear to be receiving insufficient irrigation Off-trail visitor use has resulted in the trampling of vegetation Ground cover is sparse and not in good condition Density seems to be too high that may affect channel capacity 12. Non-native and Invasive Plants Y N N/A Invasive or non-native vegetation is present Non-native or invasive plants appear to be stabilizing the banks or bed (if yes, removal must be carefully planned) 13. Channel Geometry and Profile Y N N/A There has been a noticeable change to channel section geometry There has been widening of the right bank A channel discontinuity has formed (i.e., a sudden drop along the channel bed) There has been widening of the left bank Sloughing has occurred along channel bank (i.e., there is slough material present along the toe of slope) There is noticeable lowering of the channel bed Channel low flow line has altered A new channel low flow line has formed Area 11 - Page 2 of 8 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Area 11 - Stormwater Management (Continued) 14. Groundwater Y N N/A There is evidence of soil moisture on the bank There is visible groundwater seepage 15. Water Flow Y N N/A There is water flow present in the main channel There is water flow from the tributaries or lateral drain 16. Weather Y N N/A Substantial rainfall occurred at the time of inspection Substantial rainfall has occurred since the last inspection 17. Other Y N N/A There is a condition causing substantial visible contrast to normal conditions Large woody debris, fallen trees or sediments appear to be obstructing creek flow or posing a threat Dumping has been observed Uncontrolled creek access or trampling has created a potential erosion problem Large blockages are present that are too large to remove by hand Fencing is damaged or in need of repair There is evidence of graffiti of other vandalism Trail, interpretive, informational , and/or regulatory signage is damaged or missing

OVERALL CONDITION: Excellent Good Fair Poor

For any [Y] response above, describe observations and necessary corrective actions on the following page

Photograph observed areas/issues of concern, and prepare photo journal for reference and monitoring

Gabion baskets are to be inspected only—NO MAINTENANCE. (OC Parks is not responsible for the maintenance of the gabions). Inspector to report any observed damage or issues of concern to Sr. Park Ranger at General Thomas F. Riley Wilderness Park

Area 11 - Page 3 of 8 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Area 11 - Stormwater Management (Continued) Descriptions of observations checked [Y] above: (add additional pages if needed)

Corrective measures implemented since last inspection: (add additional pages if needed)

Location(s) and description(s) of required maintenance or corrective/preventative measures: (add additional pages if needed)

Area 11 - Page 4 of 8 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Area 11 - Stormwater Management (Continued)) Photo Journal Area 11 - Stormwater Management -(add additional pages if needed) 1. Flow Control Berm Date: Insert photo/s here Comment:

2. Bypass Culvert Date: Insert photo/s here Comments:

3. Riprap Downstream of the Bypass Culvert Date: Insert photo/s here Comments:

4. Riprap Overflow Control Date: Insert photo/s here Comments:

5. Riprap Downstream of Overflow Control Date: Insert photo/s here Comments:

Area 11 - Page 5 of 8 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Area 11 - Stormwater Management (Continued)) Photo Journal (Continued) Area 11 - Stormwater Management (add additional pages if needed) 6. Tributaries Downstream of Bank Overflow Date: Insert photo/s here Comments:

7. Gabion Baskets and Mats in Area 10 (Inspect only, no maintenance) Date: Insert photo/s here Comments:

8. Wide Channel/Detention Area Date: Insert photo/s here Comment:

9. Riprap Downstream of the Oso Pkwy Culvert (Inspect only) Date: Insert photo/s here Comments:

10. Riprap Bank Protection, if applicable Date: Insert photo/s here Comments:

Area 11 - Page 6 of 8 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Area 11 - Stormwater Management (Continued)) Photo Journal (Continued) Area 11 - Stormwater Management (add additional pages if needed) 11. Riparian Vegetation/Revegetation Date: Insert photo/s here Comments:

12. Non-native and Invasive Plants Date: Insert photo/s here Comments:

13. Channel Geometry and Profile Date: Insert photo/s here Comment:

14. Groundwater Date: Insert photo/s here Comments:

15. Water Flow Date: Insert photo/s here Comments:

Area 11 - Page 7 of 8 Appendix B Wagon Wheel Creek Restoration Plan Inspection Checklists Maintenance Program

Area 11 - Stormwater Management (Continued)) Photo Journal (Continued) Area 11 - Stormwater Management (add additional pages if needed) 16. Weather Date: Insert photo/s here Comments:

17. Other Date: Insert photo/s here Comments:

Additional Notes:

Area 11 - Page 8 of 8

Wagon Wheel Creek Restoration Plan Maintenance Program