The Application

Lehigh has filed its application for an improved Permanente Quarry reclamation plan with Santa Clara County. This voluntary and comprehensive improved reclamation plan will allow us to meet Northern California’s demand for locally sourced cement and aggregate construction materials.

Just as we have in the past, our products will play a vital role in addressing critical regional priorities including the need for affordable housing, better transportation, and more sustainable development.

This application for a reclamation plan amendment incorporates the results of additional hydrologic and geotechnical investigations that have occurred since 2012. The amended plan would be superior to the approved plan and provide updated reclamation planning for continued mineral production. The following activities are included in this amended reclamation plan:

  • Development and reclamation of the Rock Plant Reserve (a new area of continued mining within the vested property);

  • Regrading and mining of the upper slopes of the north highwall to recover limestone, eliminate the need for a large fill buttress, and achieve long-term slope stability;

  • Reclamation of the majority of the WMSA in place; and,

  • Backfill of the North Quarry using a combination of imported surplus construction soil that meets site-specific acceptance criteria and greenstone overburden to protect water quality.


  • May 22, 2019 Application submitted to Santa Clara County

  • June 20, 2019 Community Open House at Cupertino Community Hall

  • June 27, 2019 Community Open House at Quinlan Community Center in Cupertino

Support for our Application