Project Activity

Soil management area

1.24 Million

Man-hours (since 2010) worked with no Occupational Safety and Health Administration Recordable Incidents

Backhoe performing remediation at Guadalupe beach


Since 1998, the primary remediation activities have focused on excavation activities and diluent‐recovery efforts. After certification of the project’s Supplemental Environmental Impact Report in 2005, hauling of Non‐Hazardous Hydrocarbon Impacted Soil from the former Guadalupe Oil Field to the Santa Maria Regional Landfill (SMRL) was initiated.


Acres of remediation

1.1 Million

Cubic yards of impacted material hauled to Santa Maria Regional Landfill


Individual excavations under the Regional Water Quality Control Board Cleanup of Abatement Order



Oil Field Features


Pad Areas
Beach remediation


Soil Samples Collected


Groundwater Monitoring Wells


Groundwater Samples Collected


Restoration of areas disturbed during remediation and decommissioning activities is ongoing throughout the Field. The goal of vegetation restoration is to establish self‐sustaining plant communities that are native to the Guadalupe/Nipomo Dunes Complex. Successful restoration of functional habitat is also monitored for the degree to which it can be—and is—utilized by the rich wildlife communities that inhabit the site. Restoration sites are meticulously monitored to ensure that restoration is proceeding in accordance with site-specific performance standards.


Restoration sites

Guadalupe Dunes Restoration


Acres of restoration in progress


Plants out planted from on-site Growing Facility


Listed plants salvaged


Listed plants planted

Guadalupe Dunes Plant Life Restoration


Acres of La Graciosa Thistle habitat created/restored


Western Snowy Plover nests counted


Western Snowy Plover nests hatched

Water Treatment

Water monitoring, investigations and associated recovery activities have been conducted at the Guadalupe Restoration Project for over twenty years. Three active free-product recovery systems are currently in operation at the site to recover separate-phase diluent. Fluids recovered are treated in the on-site Advance Water Treatment System and diluent is sent off-site for recycling.

Water Treatment

1.36 Million

Gallons of diluent recovered

16.2 Million

Gallons of fluids treated at the on-site Advanced Water Treatment System

Pilot Studies

As part of the requirements set forth by the 1998 Cleanup or Abatement Order (CAO) issued by the Regional Water Quality Control Board (RWQCB), Unocal conducted pilot studies of innovative remedial technologies that may provide an alternative to excavating petroleum hydrocarbon-affected soils at the Guadalupe Restoration Project (GRP). These technologies were recommended by the Pilot Test Panel, comprised of three scientific experts with experience in the remediation of subsurface petroleum hydrocarbon-affected soils.

The purpose of conducting pilot studies was to evaluate the applicability and feasibility of potential remedial technologies under actual field conditions. Pilot studies were intended to provide information for final design.

Pilot studies completed at GRP include Land Treatment, bioremediation, biosparging, bioventing, natural attenuation, hot water flooding, and steam injection. The selected remediation and restoration alternative were developed from the result of these pilot studies. For additional information about pilot studies please contact the project team.

Data Gap Test Cell
Ecological team collecting data
Hot water steam pilot test site