SMB_CrockerGate_FuelBreak_Phase2_SPECS.pdf

SBM_CrockerGate_FuelBreak_Phase2_2026

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Fuel Break Extension Crocker Gate – Phase 2

CEQA exempt fuel break- eucalyptus and understory – Phase 2

PHASE 1 FUEL BREAK IN FOREGROUND WITH PHASE 2 EUCALYPTUS STAND IN BACKGROUND, AS SEEN FROM

CROCKER GATE ENTRANCE AT SAN BRUNO MOUNTAIN STATE AND COUNTY PARK

Prepared By:

San Mateo County Parks Department Natural Resource Management Division

Date:

May 2026

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Table of Contents Project Map

Summary

Background

Timeline

Scope of Work

Goals

Project Location

Treatment and Approach

Ground-based Equipment

Woody Debris Management

Maintenance Plan

Treatment outcomes

Requirements

Price Bid Sheet

Project Related Tasks and Timeline

Initial Project Implementation

Treated Vegetation within Treatment Areas

Operational Specifications & BMPs

General

Fire Safety

Acceptable Heavy Equipment

Ground Disturbing Activities within Treatment Areas

Watercourse Protections

Waterbreaks

Avoidance Measures

Biological Resources

Cultural and Archaeological Resources

Appendices

Appendix A – Complete Project Map Area

Appendix B – Phase 1 Project Area (2025)

Appendix C – Flagging Key

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Project Map

THIS PROJECT WILL ENTAIL CREATING A FUEL BREAK IN THE PHASE 2 PROJECT AREA. THIS 8.5 ACRE AREA IS

PREDOMINANTLY EUCALYPTUS STAND WITH DENSE UNDERSTORY OF SHRUB AND SMALL-DIAMETER

EUCALYPTUS. PREVIOUS PHASE 1 PROJECT AREA (5.6 ACRES) WAS CREATED IN 2025 ALONG PARK BOUNDARY AND GUADALUPE TRAIL NEAR COCKER GATE TRAILHEAD. FUTURE PHASE 3 (4 ACRES), IS EXPECTED TO BE

COMPLETED IN 2027. (SEE APPENDIX A FOR ONLY THIS PROJECT AREA MAP- PHASE 2, AND APPENDIX B FOR

PHASE 1 MAP)

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Summary The County of San Mateo (“County”) covers most of the San Francisco Peninsula. The region covers 744 mi2 and is home to approximately 750,000 residents. The County is made up of 20 incorporated cities. The County provides for the health and welfare of all people within its borders and serves as the local government for the unincorporated areas. Innovation thrives here in industries including bioscience, computer software, green technology, hospitality, financial management, health care, education, and transportation. The County prides itself on how that prosperity fosters its commitment to protecting and enhancing the health, safety, welfare, and natural resources of the community.

The San Mateo County Parks Department (“Department”) serves nearly three million visitors every year. Visitors have many options when visiting the County’s unique park system. With 24 parks and recreation areas, over 16,000 acres of park land, and 190 miles of trails, the Department provides healthy outdoor activities, educational opportunities, and lasting memories.

Due to the diversity of the park system, visitors can enjoy an array of recreational opportunities, including walking; running; hiking; picnicking; horseback riding; kite surfing; fishing; camping;

gardening; tide pooling; volunteering; learning; sports courts; and playing on playgrounds.

Background This expanded fuel break in San Bruno Mountain State and County Park will reduce wildfire hazard between the park and neighboring communities, as well as improve safe ingress/egress for vehicles along the Crocker Ave and Alta Vista Way in Daly City, CA. This area is identified as a “potential shaded fuel break” and “High Priority Area” in the 2022 San Mateo County and Santa Cruz County Community Wildfire Protection Plan.

The treatment area is dominated by large, mature eucalyptus trees with an understory of small diameter eucalyptus, Monterey cypress, English and cape ivy, cotoneaster, Himalayan blackberry, and native shrubs. The project is a Phase 2, which will entail removing small diameter trees, clearing understory vegetation and ladder fuels to expand the Phase 1 5.6 acre fuel break initially created in fall 2025. The project will add 8.5 acres to the previously treated area and extend the full fuel break from Crocker Avenue to Guadalupe Canyon Parkway.

Timeline IFB Release Date: June 8, 2026

Pre-Bid meeting date and time: June 15, 2026, 10:00am Location: Crocker Gate Trailhead, Old Guadalupe Trail, Daly City, San Bruno Mountain County and State Park

Deadline date and time for questions and comments: June 17, 2026, 12pm

Bid submission date and time: June 19, 2026, 5pm

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Scope of Work Goals The removal of vegetative fuels in this area is a high priority project for the County of San Mateo due to the location of the project area within the Wildland Urban Interface (WUI) next to a residential community of Daly City, and due to Crocker Gate serving as an emergency access point in the event of a wildfire. The overall goal of this project is to remove vegetative fuels to mitigate wildfire risk and increase safety.

Project Location The project area is a eucalyptus-dominated vegetation stand near Crocker Gate Trailhead along the northeast edge of San Bruno Mountain State and County Park. The landscape consists of flat benches, with uneven terrain due to accumulated debris that is obfuscated in areas of dense ground vegetation. See project area map, Appendix A.

Treatment and Approach Treatment The project treatment requires removal of live trees up to10-inch diameter, understory shrubs and vines, as well as hazardous and dead trees up to 24-inch diameter (except where select snaps will be marked for retention). Large trees (>24 diameter) trees will be limbed up to a minimum of 10 ft.

Retained trees will have 20 ft spacing with 30-50% canopy cover. Some native understory vegetation will be marked for retention by Parks staff. Thinning small diameter shrubs and trees and limbing large trees will effectively interrupt the fuel continuity, reducing potential fire behavior and rate of spread and these treatments will create an open, mature forest structure with sparse understory vegetation and surface fuels.

Ground-based Equipment The majority of work shall be mechanical treatments which may use remote controlled mowers, tracked skid steers with masticator attachments, and chippers. Any manual treatment may be conducted with chainsaws, pole saws, and string trimmers. Large hazard trees should be stump-treated with herbicide. Invasive English Ivy should also be removed from trees and treated with herbicide. All herbicide treatments will be conducted with hand-pump and backpack-pump sprayers following Pesticide Control Recommendations (PCRs) provided by the County.

Woody Debris Management Understory vegetation that is manually treated will be chipped and spread evenly on site to a depth of <6” to maintain soil cover and suppression regeneration. All excess chips will be disposed off site. Larger logs that cannot be chipped or masticated should be hauled off site where feasible. If larger wood is inaccessible for hauling, logs should be bucked and broken down to maximize contact with the soil surface.

Maintenance Plan After initial manual and mechanical treatments of small diameter trees and understory vegetation, cut stumps and resprouting invasive species will receive a spot herbicide treatment to limit

SBM_CrockerGate_FuelBreak_Phase2_2026 | 6 regrowth. The project area will be monitored annually by Parsk staff to assess fuel and hazard tree conditions. If new hazard trees are identified or fuels accumulations threaten the long-term project benefits, then new project phase development will be assessed.

Treatment outcomes

• Cut all trees up to 10-inch diameter (≤10”), and any hazardous trees up to 24-inch diameter

(≤24”) marked by Parks staff. All stumps should be chemically treated.

• All remaining trees will be limbed to >10ft.

• Retain snags and select vegetation marked by Parks staff.

• All understory vegetation, except that marked for retention, will be cut and spread evenly on site to depths ≤6”, with remaining material removed.

• Logs will be hauled off site or bucked if inaccessible for hauling.

• All eucalyptus cut stumps in the designated treatment unit will be chemically treated. All chemical tool use will be in accordance with relevant PCRs provided by the County.

• Cut English Ivy in the designated treatment unit will be chemically treated. All chemical tool use will be in accordance with relevant PCRs provided by the County.

• Terrain will be left in similar condition as pre-project.

• Completion of fuel break to specifications described in this document will be verified by

County Parks staff within 30 days of project completion.

Requirements

a. Contractor must be able to meet treatment outcomes.

b. Contractor will follow all elements of Treatment Approach and full Operational

Specifications & Environmental Impact Avoidance Measures.

c. Contractor must be familiar with project site.

d. Herbicide application must be completed by a QAL/QAC following all compliance and label instructions, and the County provided PCR.

e. Contractor must coordinate with Parks staff for access, staging, and trail closures.

Price Bid Sheet Line Item Description Quantity Unit of Measure Cost 1 Understory vegetation management, including trees ≤10”

8.5 $/acre

2 Tree Removal by size class (10.1”- 17” diameter)

Unknown $/tree

3 Tree Removal by size class (17.1”- 24” diameter)

Unknown $/tree

4 Initial herbicide application 8.5 $/acre 5 Follow up herbicide application (1-3 months post initial treatment)

8.5 $/acre

6 Woody Debris Management Unknown $/load 7 Mobilization and Demobilization 1 Lump sum

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Project Related Tasks and Timeline

Initial Project Implementation Anticipated Timeframe

Task Details

May – June

Conduct site visits, refine scope and treatment areas and finalize implementation plan

This task involves site visits to assess the overall Project area and create treatment prescriptions for each portion of the Project Area. Upon completion of site visits, the Project team will summarize the results of the field work/site visits and prepare a refined scope of work and detailed implementation plan.

June – July

Procurement process and onboarding selected contractor for project

This task includes conducting an RFP for the project scope and desired services, and selection of a contractor to complete the treatments in the Project area.

Sept 2026 Conduct Project biological surveys, identify BMPs, flag for impact avoidance and retention, flag staging and access as needed.

San Mateo County Parks staff and/or contracted biologist(s) will conduct Pre-Project biological surveys, identify Best Management Practices (BMPs) for each treatment location based on the type and extent of treatment required, and flag areas for impact avoidance and selective retention. Staff will also identify and flag staging areas and access points to avoid sensitive resources identified during Pre-Project surveys. Biological monitoring will occur during the project implementation (see task below) to ensure project impact avoidance measures are followed. Impact avoidance measures are outlined later in this document.

Sept – Oct

Implement fuel reduction and vegetation removals

The project contractors will implement the project treatment with exact dates to be agreed upon between contractor and Parks staff. This task includes the physical implementation of the fuel reduction maintenance project, as outlined in the project scope and operational specifications.

Fall 2026 – ongoing

Monitoring After the initial treatment, the Project area and treated locations will be monitored and tracked to identify vegetation response and assess the need for retreatment, and assess the success of the pilot project.

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Treatment Specifications

Treated Vegetation within Treatment Areas Tree Removal

- Remove trees ≤10 inch diameter, except trees marked for retention by Parks staff. All live trees >10 inch diameter and any trees marked for retention shall remain.

- Remove standing dead trees ≤24 inch diameter, except snags marked for retention by Parks staff.

- Remove hazard trees ≤ 24 inch diameter that have been identified and painted orangeblue.

- Flush cut stumps (<6” tall).

- Damage to remaining trees shall be minimized to the greatest extent feasible.

Tree Pruning

- Retained trees >10” DBH will be limbed up to 10 feet.

Understory and Shrubs

- Masticate or cut/chip all understory vegetation.

- Cut English ivy vines at the base of trees and 2 ft up from base – strip foliage up to 10 ft where feasible.

- Treat ivy vines with herbicide, following County provided PCR.

- Retention of select native shrubs, as flagged by Parks staff

Debris Management

- All cut material and existing dead wood will be chipped or masticated (<6” in depth)

- Any access material will be hauled offsite

- Larger logs should be hauled offsite. Inaccessible logs can be left onsite, cut as necessary to lay flush on the ground

Herbicide Treatment

- Return 1-2 months after manual and mechanical treatments to apply spot herbicide to resprouting invasives – blackberry, ivy, cotoneaster, eucalyptus, etc

1. RMPM-GEN-28 Herbicide Application: Herbicide application will only be conducted when the climate is dry and when wind speeds do not exceed 7 miles per hour. Herbicides will not be used in or adjacent to any fish-bearing stream, lake, pond or other water bodies supporting suitable habitat for listed species. Prior to applying herbicides, the contractor will make every reasonable attempt to ensure that the San Francisco garter snake is not hidden within the plant or the residual plant matter to be treated. Handheld herbicide application is prohibited within 25 feet of the edge of any surface water. The subapplicant will only use herbicides that have been approved for use by the San Mateo County , which are identified in the County Routine Maintenance Program Manual (Horizon Water and Environmental 2020) and follow the County provided Pesticide Control Recommendation (PCR). The subapplicant will adhere to the relevant restrictions set forth by the County.

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2. Herbicide application to eucalyptus will follow current Pest Control Recommendations, provided by the County, including application within 2 minutes of stump cutting following best practices for eucalyptus management.

3. The residual chipped or masticated (where permitted) material shall be uniformly broadcast to the extent feasible within the project area, shall not exceed a depth of six inches (6”) and should average approximately three inches (3”). Any individual masticated pieces shall not exceed two feet (2’) in length or three inches (3”) in diameter at the large end to support regeneration in the understory.

4. Excessive residual chipped or masticated (where permitted) material shall not obstruct water flow in drainage features such as ditches and culverts. Such material shall be removed by the contractor prior to a forecasted 30% precipitation event or upon completion of operations, whichever occurs first.

5. Residual chipped or masticated (where permitted) material should be utilized to cover approximately 75% of any areas bared during operations and shall not be piled at the base of remaining trees or sensitive vegetation.

6. Upon completion of a treatment area the contractor shall ensure that trails are left open and passable by the public with respect to all possible park users.

7. Damage to residual trees and brush shall be minimized to the greatest extent feasible. If there is excessive damage to residual trees or brush, the contractor shall remove those specimens.

8. All stump heights will be cut no higher than six inches (6”) above the ground. All cuts will be a flat or parallel cut to the ground and will have a smooth appearance with no frayed material visible.

9. San Mateo County Parks or their supervised designee reserve the right to reasonably adjust vegetation and brush treatment if sensitive resources are identified and adjust the treatment prescription as necessary to provide adequate protections.

Operational Specifications & BMPs General

1. A pre-designated Contractor foreman will be required to be on site at all times while the crew is working. The foreman must be able to address concerns from San Mateo County Parks, their supervised designee, park users, or adjacent landowners.

2. Operations may occur from 8:00 a.m. to 5:00 p.m. (or 30 minutes after sunrise and 30 minutes before sunset depending on available daylight conditions) Monday through Friday.

Work is prohibited on legally designated holidays.

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3. The Contractor will ensure that a toilet and garbage disposal facilities are available for crews and are used in staging areas identified for operations.

4. Contractor is responsible for assessing treatment areas to determine where traffic control may be needed. Masticated or treated material of any kind should not make contact with any public road. If any masticated material contacts public roads it should be cleaned up immediately.

5. The Contractor will be responsible for preserving survey markers and will replace damaged markers at their own expense using surveyors acceptable to the landowner.

a. The Contractor will also be responsible for any damage to park infrastructure or private property and will replace or repair these items at their own expense through means acceptable to San Mateo County Parks or the landowner.

6. Prior to beginning operations, San Mateo County Parks and their supervised designee will conduct a pre-operational meeting to discuss project implementation, special protection measures and any potential operational constraints regarding the conduct of this contract that may impact project completion; including, but not limited to, planned start date, special protection measures, operational constraints, operating schedule, and order of project completion.

San Mateo County Parks or their supervised designee shall flag an example treatment area for Contractor review at the pre-operational meeting, which shall include sample marking of the treatment boundary. Contractor is responsible for identifying, marking, and maintaining operation in bounds of the permitted treatment area.

7. Crew members and all heavy equipment operators are required to utilize the Avenza or similar application on phones or tablets capable of viewing PDF georeferenced operations maps provided by San Mateo County Parks to identify the Contractors location, stay within project treatment areas or infrastructure approved for operational use, and avoid sensitive resource areas. The contractor will also use the application to map work performed on the project on a weekly basis.

a. Alternative software will be mutually agreed upon between Contractor and Parks staff, prioritizing free applications or free versions of applications.

b. All crew members must be able to use the selected application. If needed, a training can be provided to the Contractor by Parks staff.

1. GEN-1: Staging and Access

a. Staging, access, and parking areas will be located outside of sensitive habitats to the extent feasible.

b. Staging areas will be located at least 30 feet from the top of bank (or as far as feasibly possible). See additional watercourse protection measures in the section below.

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2. GEN-2: Minimize Area of Disturbance and Site Maintenance

a. Areas of disturbance will be limited to the smallest footprint necessary and a single access pathway, where feasible. For maintenance activities near waterways or other sensitive habitat, the designated work area shall be clearly identified in the field using highly visible material, and work will not be conducted outside this area.

3. GEN-6 & GEN-8 Waste Management and Materials Disposal

a. The work area must be kept free of loose trash. All food waste will be removed from site daily. Check waste disposal containers frequently for leaks and spills, and cover waste disposal containers securely at the end of every workday and during wet weather.

b. All construction materials, wastes, debris, rubbish, trash, fencing, flagging, etc. will be removed from site once the project activities are complete and disposed of in an authorized disposal area.

c. Contractor shall provide a portable restroom for workers if the nearest park restroom facility is too far from the project work area. Ensure that portable toilets are part of any spill containment plan. Clean or replace portable toilets and inspect them for leaks and spills.

d. Store any hazardous materials in an upland area in a storage container design for adequate containment.

e. Label all hazardous materials and hazardous wastes (such as herbicides, solvents, fuel, oil, antifreeze, etc.) in accordance with federal, state, and local regulations.

f. Follow manufacturers application instructions for hazardous materials and be careful not to use more than necessary. Do not apply chemicals outdoors when rain is forecast within 24 hours.

g. Arrange for appropriate disposal of all hazardous wastes.

4. GEN-7: Spill Prevention and Control

a. Keep spill cleanup materials (rags, absorbents, etc.) available at the construction site at all times.

b. Inspect vehicles and equipment daily for and repair leaks promptly. On-site monitor should insect beneath all vehicles that have been parked more than 15 minutes before they leave the work area. Use drip pans to catch leaks until repairs are made.

c. Clean up spills or leaks immediately and dispose of cleanup materials properly.

d. Do not hose down surfaces where fluids have spilled. Use dry cleanup methods

(absorbent materials, cat litter, and/or rags).

e. Sweep up spilled dry materials immediately. Do not try to wash them away with water or bury them. If water must be used, the Contractor shall collect the water and spilled fluids and dispose of it as hazardous waste.

f. Clean up spills on dirt areas by digging up and properly disposing of contaminated soil.

g. Small spills (less than 18 inches in diameter) including small quantities of oil, gasoline, paint, or other materials should be controlled by the first responder (maintenance staff) and do not necessarily require an emergency response team.

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Medium spills (greater than 18 inches but less than 6 feet in diameter) are typically controlled by the first responder (maintenance staff) but police or fire department HAZMAT teams may be called based on conditions. Report significant spills (larger than 6 feet in diameter and any “running” spill) immediately. You are required by law to report all significant releases of hazardous materials, including oil. To report a spill, contact the San Mateo County Environmental Health Services Division, or other emergency office (e.g., local fire or police department) as warranted, immediately and document the spill using the spill documentation form.

Alternatively, 1) dial 911, the local emergency response number, 2) the National Response Center at (800) 424-8802; or 2) call the Governor’s Office of Emergency Services Warning Center, (800) 852-7550 (24 hours). As appropriate, contact other agencies including California Occupational Safety and Health Administration or the Regional Water Quality Control Board. All chemical spills shall be reported as soon as possible to the emergency site contact.

5. GEN-9: Vehicle Maintenance and Parking

a. Designate an area, fitted with appropriate BMPs, for vehicle and equipment parking and storage.

b. Perform major maintenance, repair jobs, and vehicle and equipment washing off site.

c. Conduct vehicle and equipment cleaning at County corporation yards and ensure that rinse water does not run into gutters, streets, storm drains, or surface waters.

d. If refueling or vehicle maintenance must be done on-site, work in a bermed area (e.g., sandbags, gravel bags, compost socks, or other barrier material) at least 150 feet away from creek channels, away from storm drains and over a drip pan big enough to collect fluids.

e. Refuel vehicles at least 200 feet away from the active stream channel.

f. Keep an ample supply of spill clean-up materials near fueling vehicle maintenance and hazardous materials/hazardous waste storage areas. Inventory clean-up materials monthly and restock as needed.

g. Post proper fueling and spill clean-up instructions at fueling areas. Never leave the area while equipment is being filled.

h. Recycle or dispose of fluids as hazardous waste.

i. Do not clean vehicle or equipment on-site using soaps, solvents, degreasers, steam cleaning equipment, etc.

j. Perform vehicle and mobile equipment steam cleaning, pressure washing or degreasing only over a containment designed to collect any generated wash water.

Collect wash water and discharge to sewer via an oil water separator. Do not pour wash water down storm drains or sewers connected to septic systems.

6. GEN-10: Equipment Maintenance & Fueling

a. A separate area should be designated for equipment maintenance and fueling, away from any slopes, watercourses, or drainage facilities.

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b. Equipment should not be stored in areas that will potentially drain to watercourses or drainage facilities. If equipment must be stored in areas with the potential to generate runoff, drip pans, berms, gravel bags, or absorbent booms should be employed to contain any leaks or spills.

c. Equipment should be inspected daily for leaks or damage and promptly repaired.

d. Fueling and maintenance of vehicles should take place at least 65 feet away from waterways.

e. In the event of a spill, follow procedures outlined in BMP GEN-7.

7. GEN-16: Work Hours and Timing of Work

a. Operations may occur from 8:00 a.m. to 5:00 p.m. (or 30 minutes after sunrise and 30 minutes before sunset depending on available daylight conditions) Monday through Friday. Work is prohibited on legally designated holidays.

b. In general, routine maintenance and construction activities that take place in sensitive habitat and/or in channels below ordinary high water will be conducted during the dry season (June 15 through October 15). Maintenance activities that are in upland areas and that would not affect streams may occur during low rainfall years at times when there is no predicted rainfall (chance of precipitation is less than 30 percent chance of rain). Activities that are subject to permit requirements will be conducted during the period authorized by the permits.

c. Operations from October 15th – June 15th: For operations between October 15th to June 15th heavy equipment and vehicle operations may only occur during dry, rainless periods and shall not be conducted on saturated soil conditions as defined below:

i. Saturated soil is defined as soil and/or surface material pore spaces that are filled with water to such an extent that runoff is likely to occur. Indicators of saturated soil conditions may include but are not limited to areas of ponded water, pumping of fines from the soil or road surfacing material during operations, loss of bearing strength resulting in the deflection of soil or road surfaces under a load, such as the creation of wheel ruts, spinning or churning of wheels or tracks that produces a wet slurry, or inadequate traction without blading wet soil or surfacing materials.

ii. In addition, operations on roads, trails, or staging areas may only occur from a stable operating surface defined as follows: A surface that can support vehicular traffic and that routes water off the road surface or into drainage facilities without concentrating flow in ruts (tire tracks), pumping of the roadbed, or ponding flow in depressions. A stable operating surface shall include paved roads, structurally sound road base, unsaturated hard packed seasonal roads, and all must be appropriate for intended use.

8. GEN-17: Maintain Traffic Flow

a. To the extent feasible, work shall be staged and conducted in a manner that maintains two-way traffic flow on roadways in the vicinity of the work site.

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b. Heavy equipment and haul traffic shall be prohibited in residential areas to the greatest extent feasible. When no other route to and from the site is available, heavy equipment and haul traffic through residential areas shall be restricted to the hours of 8 a.m. to 5:30 p.m., Monday through Friday.

c. If heavy equipment or hauling is required beyond the hours above, the County or their contractor would provide notice to adjacent property owners 48 hours in advance of such activities

9. GEN-18: Traffic Control and Public Safety

a. In the event that work activities require the temporary closure of any traffic lanes, the contractor is responsible for obtaining necessary permits and permissions, including notifying all local emergency service providers regarding any planned lane closures. The contractor shall manage all measures to guide traffic (such as signage and flaggers), safeguard workers, provide safe passage of vehicles, and minimize traffic impacts through the duration of work activities. County staff should be informed of traffic control plans prior to commencement of work.

b. For any other work within or near the roadway that could pose a hazard to the public, the contractor shall install/implement appropriate measures, such as fences, barriers, flagging, guards, and/or signs, to give adequate warning and provide protection from the potentially dangerous condition. County staff should be informed of measures to be implemented plans prior to commencement of work.

c. For work activities along or near roadways with sidewalks and bike lanes, the contractor shall implement measures to ensure the safe passage of pedestrians and bicyclists around the work site. County staff should be informed of measures to be implemented plans prior to commencement of work so that appropriate communication can be made to park users.

d. Where work is proposed at a recreational park or trail, warning signs will be posted several feet beyond the limits of work. Signs will also be posted if trails will be temporarily closed. County staff should be informed of measures to be implemented plans prior to commencement of work so that appropriate communication can be made to park users.

e. Public transit access and routes will be maintained in the vicinity of the work site. If public transit will be affected by temporary road closures and require detours, affected transit authorities will be consulted and kept informed of project activities.

County staff should be informed of measures to be implemented.

10. GEN-19: Dust Management Controls

a. The County will implement the Bay Area Air Quality Management District (BAAQMD) Basic Dust Control Measures. Current measures stipulated by the BAAQMD Guidelines include the following:

i. All exposed surfaces (e.g. staging areas, unpaved access roads) will be watered two times daily.

ii. All haul trucks transporting wood chips or other loos materials off-site will be covered.

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iii. All visible mud or dirt track-out onto adjacent public roads shall be removed using wet power vacuum street sweepers at least once per day. The use of dry power sweeping is prohibited.

iv. All vehicle speeds on unpaved roads shall be limited to 15 mph.

v. All roadways, driveways, and sidewalks to be paved shall be completed as soon as possible. Building pads shall be laid as soon as possible after grading unless seeding or soil binders are used.

vi. Idling times shall be minimized either by shutting equipment off when not in use or reducing the maximum idling time to 5 minutes (as required by the California airborne toxics control measure Title 13, Section 2485 of California Code of Regulations [CCR]). Clear signage shall be provided for construction workers at all access points.

vii. All construction equipment shall be maintained and properly tuned in accordance with manufacturer’s specifications. All equipment shall be checked by a certified visible emissions evaluator.

Fire Safety

1. All earthmoving and portable equipment with internal combustion engines will be equipped with spark arrestors.

2. During the high fire danger period (April 1–December 1), work crews will:

a. Maintain compliance with state Public Resources Code governing fire tools in the wildland (PRC § 4428).

b. Have appropriate fire suppression equipment available at the work site. When heavy equipment is on site, the minimum required fire suppression equipment will include a filled water buffalo and McLeod/round point shovel.

c. Keep flammable materials, including flammable vegetation slash, at least 10 feet away from any equipment that could produce a spark, fire, or flame.

d. Not use portable tools powered by gasoline-fueled internal combustion engines within 25 feet of any flammable materials unless a round-point shovel or fire extinguisher is within immediate reach of the work crew (no more than 25 feet away from the work area).

3. Contractor shall prepare and keep record of a daily checklist made available at the request of San Mateo County Parks or their supervised designee that checks the following for daily operations:

a. Inspections around the equipment and staging area for any wildlife that may have decided to occupy the area.

b. Inspections for any equipment leaks.

c. Ensure all water tanks for fire suppression are full.

d. Confirm that necessary pre-work biological surveys have been completed.

e. Record wind speed and relative humidity measurements at the beginning of operations, 12:00 p.m. and at the conclusion of operations each day.

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4. CALFIRE, San Bruno Fire, San Mateo County Parks, or their supervised designee, reserves the right to restrict operating hours or operations in total during critical fire weather.

Acceptable Heavy Equipment

1. Small, tracked tractor such as a skid steer, mini excavator or low-profile – remote controlled masticator with forestry mulching head capable of working under eight-foot (<8’) canopies.

2. Track chipper with capacity to process woody material up to twelve inch (<12”) in diameter.

3. Other heavy equipment may be proposed for use by the Contractor and must be approved by San Mateo County Parks. To propose other heavy equipment, the Contractor should be prepared with equipment dimensions, weight, and photos of equipment.

Ground Disturbing Activities within Treatment Areas

1. Ground disturbance shall be minimized to the greatest extent feasible. Berms, ruts, and other operator-caused ground disturbance over twelve inches (>12”) in height/depth shall be smoothed out to original contours before leaving the immediate work area.

2. Equipment shall operate parallel to the slope (up and down the fall line) to the greatest extent feasible.

3. The cutting or mulching head of the masticator shall be kept at or above the duff layer and not into mineral soil to the greatest extent feasible.

4. Equipment shall not enter areas outside of the designated project areas unless authorized by San Mateo County Parks, or their supervised designee.

5. Heavy equipment operation between October 15 – June 15 shall only be implemented during dry-rainless periods and on unsaturated soils (see GEN-16 below). If soil conditions do not permit use of heavy equipment during this timeframe operations must cease until a time when soil conditions improve.

6. Upon completion of a treatment area the contractor shall ensure that roads and trails are left open and passable by the public with respect to all possible park users.

a. Scattered debris is acceptable on the road or trail but not to the point that it creates any significant hazards for park staff or users.

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Watercourse Protections

1. Where treatment with heavy equipment is possible in proximity to Class I or II watercourses, San Mateo County Parks staff will flag an equipment limitation zone (ELZ) buffer with yellow and white striped equipment exclusion zone flagging. Class III watercourses centerlines will be flagged using blue tape in proximity to where operations will occur and an appropriate ELZ will be flagged or communicated with the contractor.

2. Adhere to BMPs GEN-1, GEN-7, GEN-9, GEN-10 as outlined above for staging and access in proximity to watercourses, spill prevention and control, vehicle maintenance and parking, and equipment maintenance and fueling as it pertains to protection measures and impact avoidance around watercourses.

Waterbreaks

1. Where necessary on existing park roads and/or trails used for access, waterbreaks shall be re-installed in their original locations and original configuration on appurtenant seasonal roads or staging areas used by the Contractor following operations and prior to October 15th on any year that operations occur.

2. Where waterbreaks need to be additionally placed following operations, they shall be placed similarly to other existing waterbreaks. At minimum, waterbreaks placed shall be placed at an approximate 45-degree angle, be cut diagonally to a minimum 6 inches into the firm roadbed or disturbed area, have a continuous firm embankment of at least 6 inches in height, and a width of 6 inches immediately adjacent to the lower edge of the waterbreak cut-out flow.

3. If the installation of additional waterbreaks cannot be accomplished by heavy equipment due to inability to access a site, then hand-dug waterbreaks may be constructed with less than the requisite 6 inches above grade and 6 inches below grade where appropriate but must be functional and maintain a 6-inch-wide outlet.

4. Waterbreaks shall be located to allow water to be discharged into some form of vegetative cover, duff (forest floor detritus), slash, rocks, or less erodible material wherever possible, and shall be constructed to provide for unrestricted discharge at the lower end of the waterbreak so that water will be discharged and spread in such a manner that erosion shall be minimized.

5. Waterbreaks may be located and adjusted outside of the maximum waterbreak spacing specified at the discretion of San Mateo County Parks, or their supervised designee in order to reduce any potential impacts and allow for the beneficial use of water. The waterbreaks shall be situated in a manner as to allow water to drain into stable soil configurations.

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6. Waterbreak spacing shall conform with the table below. The waterbreak spacing may also be adjusted by San Mateo County Parks, or their supervised designee to create a greater level of protection than identified under general soil stabilization measures.

a. Where vegetation is not adequate to act as a sediment filter at waterbreak outlet locations that have the potential to discharge sediment to a watercourse, the Contractor shall armor the road drainage outlets with slash, chunks of wood, rock, or other methods in consultation with San Mateo County Parks, or their supervised designee.

Avoidance Measures Biological Resources

1. BIO-1: Environmental Awareness Training

a. Prior to commencing project activities, all participating project personnel will attend a worker environmental awareness training program. The training will include a brief review of special-status species, sensitive habitats, and other sensitive resources that may exist in the project area, including field identification, habitat requirements, and the legal status and protection of each relevant species, as well as locations of sensitive biological resources. The training will include materials concerning the following topics: sensitive resources, resource avoidance, permit conditions, and possible consequences for violations of State or Federal environmental laws. The training will cover the maintenance activity’s conservation measures, environmental permits, and regulatory compliance requirements, as well as the roles and authority of the monitors and biologist(s). It will include printed material and an oral training session by a qualified biologist. The training will occur within 3 days of the arrival of any new worker to the project.

2. Biological Monitor

a. A USFWS service approved biological monitor must be on site for all project activities that occur within 100 feet of habitat for listed species. The biologist will have the authority to stop any work activities that may result in potential adverse effects to listed species and/or their habitats.

10% or less 11-25% 26-50% >50%

100 75 50 50

* Feet = Measured along the ground based on slope

U.S. Equivalent Measure Road or Trail Gradient in percent

Maximum Distance Between Waterbreaks Measured in *Feet

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3. Entrapment protection

a. Construction materials that have the potential to entangle or entrap wildlife will be properly contained so that wildlife cannot interact with the materials

4. Minimize Impacts to San Francisco Garter Snake

a. SFGS-1 Clearance Surveys: Within 24 hours prior to the commencement of project activities, the action area will be surveyed for snakes and suitable snake habitat by a Service-approved biologist. The biologist also will provide the Service with a written report (email is acceptable) that adequately documents the pre-construction survey results within 24 hours of starting the project activities. The Service-approved biologist will reinspect the action area whenever a lapse in project activities of 2 weeks or greater has occurred. If a snake is encountered during surveys, activities will cease until the Service-approved biologist has determined that the snake will not be harmed or until the snake leaves the work area on its own.

b. SFGS-2 Dewatering: Suitable aquatic habitat, as identified by the biologist during the clearance surveys, will be dewatered, and then it will remain dry and absent of aquatic prey for 15 days before starting construction activities. If complete dewatering is not possible, the Service will be contacted to determine what additional measures may be necessary to minimize effects to the snake.

c. SFGS-3 Biological Monitor: A Service-approved biologist will inspect and monitor all project-related activities occurring within suitable habitat to attempt to minimize take of the snake or the destruction of its habitat. If snakes are encountered during project activities, activities will cease until the Service-approved biologist has determined that the snake will not be harmed or until the snake leaves the work area on its own. If the snake does not leave the work area, work will not be reinitiated until the Service is contacted and has made a decision on how to proceed with work activities. A report will be submitted, including date(s), location(s), habitat description, and any corrective measures taken to protect the snake within one business day.

d. SFGS-4 Seasonal Avoidance: To the extent practicable, project work occurring within 250 feet of suitable snake habitat will be conducted from April through October, during the species’ active season.

e. SFGS-5 Vegetation Removal: For vegetation removal at sites with suitable snake habitat, vegetation will be cut down to 3 inches using hand tools (e.g., weedwhacker). Once the ground is visible, a visual survey for snakes will be conducted. If no sensitive species are found in the area, removal of vegetation may

SBM_CrockerGate_FuelBreak_Phase2_2026 | 20 continue by mowing or using mechanized equipment very slowly with the Service-approved biological monitor walking in front of the equipment to observe.

f. SFGS-6 Litter Control Program: A litter control program will be instituted in which all workers will ensure their food scraps, paper wrappers, food containers, cans, bottles, and other trash are deposited in covered or closed trash containers. The trash containers will be removed from the site at the end of each working day.

5. BIO-8: Minimize Impacts on Dusky-footed Woodrat Nests

a. If suitable habitat for San Francisco dusky-footed woodrat is determined to exist in the work area, the following measure will be followed:

i. No more than two weeks prior to the beginning of ground disturbance or other routine maintenance activities that could disturb woodrat nests, a qualified biologist will survey the work areas scheduled for maintenance. If any dusky footed woodrat nests are found, the nests shall be flagged and construction fencing or flagging that will not impede the movement of the SFDW shall be placed around the nest to create a 10-foot buffer (where feasible). If the nest is located adjacent to a road or trail, the nest shall be clearly flagged so equipment/truck drivers accessing sites can see the nest.

If a dusky-footed woodrat nest is identified in a work area, the following measure will be implemented by the County.

ii. The County will avoid physical disturbance of the nest if feasible. Ideally, a minimum 10-foot buffer should be maintained between maintenance construction activities and each nest to avoid disturbance. In some situations, a smaller buffer may be allowed if in the opinion of a qualified biologist removing the nest would be a greater impact than that anticipated as a result of maintenance activities.

iii. If a dusky-footed woodrat nest cannot be avoided and the nest is located in urban or bayside areas where woodrat populations are small and isolated from larger populations, the County will consult with CDFW regarding the appropriate measures to minimize impacts.

iv. If a dusky-footed woodrat nest cannot be avoided and the nest is located in more rural or natural areas and/or where woodrat populations are large and have connectivity to large populations, one of the following two relocation measures will be implemented by the County:

1. If the woodrat nest site and the proposed relocation area are connected by suitable dispersal habitat for the woodrat, as determined by a qualified biologist, the following relocation methodology will be used: Prior to the beginning of construction activities, a qualified biologist will disturb the woodrat nest to the degree that all woodrats leave the nest and seek refuge outside of

SBM_CrockerGate_FuelBreak_Phase2_2026 | 21 the maintenance activity area. Relocation efforts will avoid the nesting season (February - July) to the maximum extent feasible.

Disturbance of the woodrat nest will be initiated no earlier than one hour before dusk to minimize the exposure of woodrats to diurnal predators. Subsequently, the biologist will dismantle and relocate the nest material by hand. All material from dismantled nests will be placed in a pile, preferably against a log or tree trunk, in suitable habitat located at least 20 feet from, but otherwise as close as possible to, the original nest locations, to provide material for woodrats to construct new nests. During the deconstruction process, the biologist will attempt to assess if there are juveniles in the nest. If immobile juveniles are observed, the deconstruction process will be discontinued until a time when the biologist believes the juveniles will be fully mobile. A 10-foot-wide no-disturbance buffer will be established around the nest until the juveniles are mobile. The nest may be dismantled once the biologist has determined that adverse impacts on the juveniles would not occur.

All disturbances to woodrat nests will be documented in a construction monitoring report and submitted to CDFW.

2. If a qualified biologist determines that the woodrat relocation area is separated from the nest site by major impediments, or a complete barrier, to woodrat movement, trapping for woodrats will be conducted prior to relocation of nest material. Prior to the start of nest relocation activities, artificial pine box shelters will be placed at each of the sites selected for relocation of nest materials. The dimensions of the artificial shelters will be approximately 8” long x 8” wide x 6” high. Each shelter will include two interior chambers connected by an opening. At the relocation sites, the artificial pine box shelters will provide basement structures for the relocated woodrat nest materials, allowing woodrats to enter, use, and modify the relocated nests. A qualified biologist will set two traps around each of the woodrat nests to be relocated. Traps will be set within one hour prior to sunset, and baited with a mixture of peanut butter, oats, and apples. Traps will also be equipped with cotton bedding and covered with cardboard. The traps will be checked the following morning, within one and-a-half hours of sunrise. If a woodrat is captured it will be placed in a quiet area while its nest material is relocated; the animal will then be released at the relocated nest. If no woodrats are captured after the first night, the biologist will set the traps for one additional evening to increase the probability of

SBM_CrockerGate_FuelBreak_Phase2_2026 | 22 capturing the animal and ensuring a safe relocation. If no woodrats are captured at a given house after two nights, it will be assumed that the house is not currently occupied.

3. Trapping will only be conducted outside the breeding season, which for woodrats is from February through the end of July. If a litter of young is found or suspected while dismantling a nest for relocation, the nest material will be replaced, any trapped woodrats will be returned to the nest, and the nest will be left alone for 2 to 3 weeks, after which time the nest would be rechecked to verify that the young are capable of independent survival, as determined by the lead woodrat biologist, before proceeding with nest dismantling.

6. BIO-9: Measures to Protect Nesting Migratory Birds

a. To the extent possible, conduct vegetation removal activities prior to nesting bird season (February 1 through August 31).

b. For maintenance activities or tree removal that are scheduled to occur between

February 1 and August 30, a qualified biologist will survey the work area and a minimum of 300 feet surrounding the work area for raptor nests and 100 feet for nests of non-raptors. This survey will occur no more than three days prior to starting work.