Pilarcitos Quarry

Project #: 260531  –   Updated: March 17, 2016

Project Summary

Pilarcitos Quarry is a nearly 600-acre aggregate mining facility located in Half Moon Bay, California. The site was acquired by Vulcan Materials Company in 2015, the same year in which Pilarcitos Quarry achieved certification. A dedicated team of employees and volunteers manages approximately one-third of the property for wildlife habitat.
A diversity of habitats span the site, including red alder forest, eucalyptus groves, coyote brush scrub, Douglas fir forest, poison oak scrub, arroyo willow thickets, ruderal vegetation, and aquatic habitats. While the main use of the property is granit...

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Location (by county):
San Mateo County (CA)

Watersheds:
San Francisco Coastal South

Congressional Districts:
CA District 14

Bird Conservation Regions:
Coastal California

USFWS Regions:
Pacific Southwest Region

Public Access

Site Name Publicly Accessible
Site 1 No

Full Project Description

Pilarcitos Quarry is a nearly 600-acre aggregate mining facility located in Half Moon Bay, California. The site was acquired by Vulcan Materials Company in 2015, the same year in which Pilarcitos Quarry achieved certification. A dedicated team of employees and volunteers manages approximately one-third of the property for wildlife habitat.
A diversity of habitats span the site, including red alder forest, eucalyptus groves, coyote brush scrub, Douglas fir forest, poison oak scrub, arroyo willow thickets, ruderal vegetation, and aquatic habitats. While the main use of the property is granite mining, the area in which habitat projects are located is under a conservation easement. The team at Pilarcitos works to maintain several habitat projects; some efforts are necessary for mitigation purposes, including the construction and upkeep of two ponds that provide viable breeding habitat for the federally threatened California red-legged frog. Other endeavors are voluntary and exceed requirements.
One voluntary project is dedicated to preserving and enhancing existing roosting habitat for the Townsend’s big-eared bat. This species of bat is threatened by habitat loss, human disturbance and destruction of roost sites. In 2012, the team first observed Townsend’s big eared bats on site in an abandoned cabin and old barn. After conferring with WRA Environmental Consultants, the Wildlife Habitat Council, and bat experts, the team decided to keep these structures intact in order to maintain them as bat habitat. A WRA biologist began monitoring these sites on a bi-annual basis, and continues to observe the bats in these locations. In addition to biological monitoring of individuals, Vulcan Materials Company also plans to soon begin monitoring of the physical, atmospheric conditions of the structures.
The team at Pilarcitos also makes efforts to provide habitat and population monitoring for local herpetofauna, specifically the San Francisco garter snake. Snake boards have historically been placed in the conservation easement to informally monitor populations. Recently, this project has developed into a more formal endeavor with monitoring taking place twice each year.

Actions

Project Actions
Other: Improve landscape connectivity Show/Hide details
Other: Wildlife at Work Show/Hide details
Establish artificial dens/nests/roosts Show/Hide details
Other: Conservation Certification Show/Hide details

Outcomes

Is the success of this project's actions being monitored?   No/Unknown

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Organization

Vulcan Materials Company
(Company/Business)

Primary Contact

Certification Department
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