Quick facts

Permit amendment summary
To continue providing an affordable, local source of high-quality aggregate materials to infrastructure projects in San Benito County and surrounding region, Graniterock seeks to amend the Wilson Quarry Reclamation Plan and modify its Use Permit to continue the designed placement of reclamation material and subsequent revegetation of the project area. Reclamation material consists of native sedimentary material removed from the top of the rock deposit, along with surplus granitic material that results from rock crushing operations.

Graniterock filed the permit amendment application with San Benito County on December 10, 2025.

Approval of this Permit Amendment Project does not expand the Wilson Quarry's boundaries or change its operations. Wilson Quarry operations are consistent with approved Revegetation and Reclamation Plans. Approval allows Graniterock’s Wilson Quarry to keep providing affordable, high-quality aggregate to the region from a local source, great jobs to our local community, and substantial tax revenue to San Benito County.
Other than authorizing continuation of the designed placement reclamation material and subsequent revegetation of an area located within the existing Use Permit boundary and adjacent to the existing reclamation area, this Project involves no change to long-standing Wilson Quarry operations.
  • The approval of the Permit Amendment Project will not result in new truck traffic or haul routes.
  • The approval of the Permit Amendment Project will not change:
    • the pace or nature of the aggregate production operations,
    • the methods used to place the materials, or
    • equipment used onsite.
  • The Permit Amendment Project will not change the reclamation area's end use, which is revegetated open space.
  • Approval will not change the existing Use Permit boundary, the existing designed placement of reclamation material currently occurring onsite, or the site’s final reclamation design goals.
No, we are not out of space. We are planning for environmentally responsible operations and affordable aggregate products for today and future generations. Approval of this Permit Amendment Project does not expand the Wilson Quarry's boundaries. It would authorize continuation of the designed placement of reclamation material and subsequent revegetation of the project area, which is located within the existing Use Permit boundary and adjacent to existing reclamation areas.
Graniterock wants to continue serving as the premier local, affordable supplier of the aggregate materials needed to fix and build roads and improve infrastructure in San Benito County and the surrounding region.

A local aggregate and asphalt source contributes to affordability for local projects, reduces truck traffic, and stretches local tax dollars.

Distance matters:
  • A large percentage of infrastructure jobs depend on aggregate and construction materials. Utilizing local materials translates into savings for public agencies and other customers, allowing for more roadway improvement and other infrastructure projects.
  • On a recent paving project in the nearby Aromas community, supplying project materials from the Wilson Quarry saved San Benito County a quarter million dollars when compared with utilizing aggregate from the next closest quarry. The Wilson Quarry is within two miles of Aromas. The next closest supply is in Monterey County 39.4 miles. The difference in miles per load saved (37.4 miles) translates to:10,322 truck miles not driven on our already congested roads and highways. Total miles saved = 37.4 miles per truckload X 276 truckloads of material required for the project.
There is a long list of projects that have used our quarry's materials. The Wilson Quarry produces high-quality, affordable aggregate products supplied to roadway, airport, bridge, rail, school, water storage, and other critical infrastructure projects in San Benito County and throughout the surrounding region including:
  • Major highways and freeways in the region, including Highway 1, Highway 101, State Routes 25, 129, 152, and 156, as well as Interstates 280, 680, and 880.
  • San Francisco and San Jose international airports, Hollister Airport, Monterey Airport, Salinas Airport and Marina Airport.
  • Levee projects in Pajaro near Watsonville and the San Francisco Bay utilize quarry products.
  • Area dams supplied include those at Anderson, Calaveras, Llagas, and Uvas.
  • Shoreline Rip Rap projects in San Mateo, Santa Cruz and Monterey counties.
  • And other types of public facilities as well as commercial, industrial and housing projects with the private sector.
  • A representative list of San Benito County public infrastructure projects includes:
    • Fairview Road overlay
    • Union Road bridge reconstruction
    • 2024 Hollister Citywide Roadway Improvement Project
    • Highway 25 (multiple)
    • Rancho San Justo Middle School, R. O. Hardin Elementary School, Sunnyslope Elementary School
    • Highway 156 (multiple)
    • Hollister Integrated Water Treatment Plant
    • Hollister Hills State Park
    • Sunnyslope Water District
    • San Benito County JOC (paving, emergency repairs)
    • City of Hollister overlay
No, the Wilson Quarry property is not a barrier. In fact, our property, at a connection point between the Santa Cruz and Gabilan mountain ranges, provides working land that wildlife can cross safely – avoiding residential properties and major roadways. We know from work performed by local land trusts that wildlife regularly, safely crosses our 3,500 acres of property at and surrounding the Wilson Quarry. The project area and our current reclamation area do not create a barrier to wildlife movement.
Absolutely. There are 540 current Graniterock employees living in the San Benito, Monterey, and Santa Cruz County region. Graniterock has 103 current employees living in San Benito County. Many Graniterock retirees and their families choose to stay in the area post-retirement and contribute to their community. Graniterock’s headquarters is in Watsonville, approximately fourteen miles from the quarry site.
We are happy to welcome community members for visits to the Wilson Quarry and our adjacent working lands. We run monthly and semi-monthly tours during the months when weather conditions facilitate travel around the property, which generally is early April through early November.

Our regular tour season will start again in the Spring of 2026. You can sign up for a tour by emailing [email protected] or calling Keith Severson, Graniterock's Director of Community Involvement, at 831.768.2000.