Scope_of_Work_&_Specifications.docx

San Mateo County Parks District II Wunderlich County Park Hazard Tree Mitigations & Woody Debris Management

Addresses:

Wunderlich County Park (WCP): 4040 Woodside Road, Woodside, CA 94062 Private Property: 730 Bear Gulch Road, Redwood City, CA 94062 | (APN: 072250170) | GPS: 37.409217, -122.273649

Scope of Work:

Safely remove and manage the woody debris for three (3) hazard trees and one (1) downed tree in Wunderlich County Park and 730 Bear Gulch Road. Hazard trees are marked with two orange paint dots.

Stump heights shall not exceed 6 in. above grade. Implement appropriate traffic control measures as needed.

All work performed in SMC Parks must abide by ANSI Z133 Safety Standards, ANSI A300 Tree Care Standards, and ISA BMP's. Communication with ranger and Parks staff as requested is essential for a successful project.

Woody Debris Management Specifications:

Woody debris less than 16” shall be chipped and broadcasted (away from trees, trails, roads, waterways, and use areas), onto Park’s land. Mulch or chip height shall not exceed 12 in.

Larger logs and wood that cannot be chipped shall be hauled off to an appropriate green waste facility, with the exception of some rounds that will be identified for retention. These logs will be bucked into manageable rounds for the private property owner and dropped off at a specified location at 730 Bear Gulch Road.

Any large logs and wood from the downed Douglas-fir that are currently on Parks’ land, should be scattered on Parks’ land (separated from other logs by at least twice their diameter), be six (6) ft. away from any tree base, limbed, and bucked into the long sections that are in contact with the ground. Additionally, any logs retained on Parks’ land must be a minimum of 15 ft. away from Bear Gulch Road.

Estimations for the amount (volume or weight) of woodchips/mulch generated must be provided upon project completion.

Limitations:

Contractor shall notify San Mateo County Parks five (5) days in advance prior to scheduling the tree work to allow sufficient time for public notice, trail/closures, and biological monitoring to take place beforehand.

All workers must obtain an annual environmental awareness training prior to commencing any work on San Mateo County Parks land. This brief training will be provided by SMC Parks’ Natural Resource Management personnel and cover standard Best Management Practices (BMP’s) and environmental regulations.

No woody debris material shall be deposited or broadcasted into drainage channels or waterways.

Soil compaction and erosion avoidance and minimization measures through the use of traction mats, plywood, and/or mulch.

No mulch or chips shall be broadcasted onto the private residential property (730 Bear Gulch Road).

Summary of Work Requested:

· Total: (4) four tree removals and woody debris management.

1-Douglas fir Pseudotsuga menziesii Mitigation: Tree removal.

DSH: 13 in.

Height: 30 ft.

GPS Location: 37.409217, -122.273649 Location: Bear Gulch Road.

Unique ID: PSME-02182026-1230-1 Defect/Conditions of Concern The Douglas-fir tree sustained significant structural damage, approximately 90- 95% of its crown was crushed and lost during the failure of a surrounding tree. Asymmetrical crown and low Live Crown Ratio (LCR).

Targets: Bear Gulch Road.

2- Coast live oak Quercus agrifolia Mitigation: Tree removal.

DSH: 8 in.

Height: 25 ft.

Unique ID: QUAG-02182026-1241-1 Defect/Conditions of Concern: The oak tree sustained significant structural damage, approximately 80-90% of its crown was crushed and lost during the failure of a surrounding tree.

Targets: Bear Gulch Road.

Notes: Traffic control needed.

3- Coast live oak Quercus agrifolia Mitigation: Tree removal.

DSH: 16 in.

Height: 30 ft.

Unique ID: QUAG-02182026-1241-2 Defect/Conditions of Concern: The oak tree sustained significant structural damage during the failure of a surrounding tree. The oak was crushed, resulting in a significant vertical bole crack with heartwood separation. The oak’s trunk failed and has lost significant structural stability, leaning heavily and parallel to the road.

Targets: Road.

Notes: Traffic control needed.

Downed Tree & Woody Debris Removal:

Douglas-fir Pseudotsuga menziesii Diameter: 56 in.

Length: 150+ ft.

Unique ID: PSME-02182026-1230-2

Tree Risk Assessment Assumptions and Limitations:

· All trees carry some degree of risk for failure and susceptibility to decline.

· Trees are living organisms that cannot always be fully understood or controlled.

· This tree risk assessment is based on the knowledge of the inspecting arborist and information gathered from tools and observations. All arborists are limited by their education, training, experience, tools, and site conditions. However, as specialists in tree care and risk management, arborists must fulfill their duty of care by taking reasonable measures to identify, communicate, and address detectable conditions of concern with the client.

· Tree failure cannot always be predicted. Tree failures are caused by a combination of factors that are not always visible, predictable, or manageable.

· Assessments are based on conditions observed during the time of assessment. Any alteration to the tree or site conditions that are caused by severe weather events, construction, pests, pathogens, wildlife, or other human activities can affect the stability and risk of tree failure. Such types of future changes cannot be foreseen and taken into consideration during a tree risk assessment. These changes depending on the severity can invalidate the tree risk assessment.

· Omission or alteration of any part of this report invalidates the tree risk assessment.

· Recommendations provided for reinspections and timeframes for the implementation of mitigation treatments are not a guarantee that the tree will continue to remain healthy or standing. Tree failures within the specified reinspection intervals and timeframes can still occur due to an act of God or unforeseen reasons.

· Mitigation treatments cannot guarantee that the tree will recover, be safe, or remain standing. Mitigations serve only to reduce the risk to tolerable levels.

· Only trees included in the scope of work were inspected. No other tree(s) in the vicinity were assessed.

· This report represents the professional opinion of the inspecting arborist.

· The findings and recommendations presented in the report can be either adopted or disregarded. Clients have the option to seek further consultation from other parties.

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