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Property Details for 1021 & 1037 Baseline Street Site


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Former Estby Cornelius Texaco
265367
1021 & 1037 Baseline Street CORNELIUS, OR 97113
.53
R407081, R407090
45.520018981743 / -123.059090466809
999
Labaw, Joanne
Labaw.Joanne@epa.gov
206-553-2594


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Property Location



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Property Progress


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CAs Associated with this Property

CA NameCA #StateTypeAnnouncement Year
R10 TBA - Oregon (STAG Funded)n/aORTBA2004


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Assessment Activities at this Property

ActivityEPA FundingStart DateCompletion DateCAAccomplishment Counted?Counted When?
Phase I Environmental Assessment$17,949.8705/13/202411/19/2024R10 TBA - Oregon (STAG Funded)YFY25
Phase II Environmental Assessment$124,653.1805/13/202405/12/2025R10 TBA - Oregon (STAG Funded)N


Is Cleanup Necessary? Yes
EPA Assessment Funding: $142,603.05
Leveraged Funding:
Total Funding: $142,603.05


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Climate Adaption and Mitigation - Planning or Assessment

There is no data for Climate Adaption and Mitigation - Planning or Assessment.


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Contaminants and Media


Arsenic
Asbestos
Lead
Mercury
Other Metals
PCBS
Petroleum Products
NOT Cleaned up
NOT Cleaned up
NOT Cleaned up
NOT Cleaned up
NOT Cleaned up
NOT Cleaned up
NOT Cleaned up
Building Materials
Soil
NOT Cleaned up
NOT Cleaned up


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Cleanup Activities

There are no current cleanup activities.


Cleanup/Treatment Implemented: N
Cleanup/Treatement Categories:
Addl Cleanup/Treatment info:
Address of Data Source:
Total ACRES Cleaned Up: .53
Number of Cleanup Jobs Leveraged:
EPA Cleanup Funding:
Leveraged Funding:
Cost Share Funding:
Total Funding:


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Climate Adaption and Mitigation - Demolition or Cleanup

There is no data for Climate Adaption and Mitigation - Demolition or Cleanup.


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Institutional and Engineering Controls

U
U


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Redevelopment and Other Leveraged Accomplishments

There are no current redevelopment activities.


Number of Redevelopment Jobs Leveraged:
Actual Acreage of Greenspace Created:
Leveraged Funding:


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Climate Adaption and Mitigation - Redevelopment

There is no data for Climate Adaption and Mitigation – Redevelopment


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Additional Property Attributes

The subject property is located in the central portion of Cornelius, Oregon, and consists of two parcels: Parcel ID R407081 and Parcel ID R407090, totaling 0.53 acres. The TBA Site is currently owned by the City of Cornelius and has been inactive since 2007. The subject property currently contains three out-of-use fueling islands and a kiosk underneath a canopy, a bathroom/office building on the southwestern portion of the property, as well five inactive underground storage tanks (USTs) and two decommissioned USTs located on the western portion of the Site. The subject property was first developed by at least 1912 with a rail spur associated with the Southern Pacific Railroad and was used commercially as a fueling station from 1953 until 2007.
Previous soil, groundwater, and soil vapor sampling events were conducted at the 1021 & 1037 Baseline Street site. A 1996 letter from Oregon Department of Environmental Quality (ODEQ) states that gasoline contamination was discovered during station upgrades, and 24 tons of soil were subsequently removed and disposed of at the Hillsboro Landfill. Additional environmental sampling events occurred in the mid-2000s and mid-to-late 2010s to investigate potential releases from the five newer USTs installed on the property. Total petroleum hydrocarbons (TPH) gasoline range organics (GRO) was detected in one soil gas sample at levels that exceeded the March 2024 Oregon Department of Environmental Quality?s Risk Based Concentration (RBC) for commercial land use.
A Targeted Brownfields Assessment (TBA) of the Site was approved in May 2024. Phase I and Phase II ESA reports were issued in November 2024 and May 2025, respectively. The Phase I report identified the following recognized environmental conditions and areas of concern: known petroleum releases from onsite USTs, onsite USTs without proper closure, potential metal contamination associated with historic railroad activity, known historic release from USTs with regulatory closure, and potential hazardous building materials in site structures.
During the 2025 Phase II, arsenic was detected in four soil boring locations and lead was detected in one soil boring location within the footprint of the former rail spur at concentrations exceeding ODEQ RBCs for Residential and/or Occupational Soil. TPH-GRO was detected in vapor wells VP-3 and VP-5 above the ODEQ Residential Soil Vapor RBC. TPH-GRO at VP-5 also exceeded the ODEQ Commercial Soil Vapor RBC, indicating that the documented releases at the site continue to impact site soil vapor in areas around the USTs. Additionally, a Hazardous Building Material Survey (HBMS) completed during the 2025 Phase II identified ACBM in samples along the seams of the main canopy?s metal roof panels. White caulking was observed on the main canopy roof and is presumed to contain asbestos. Mercury-containing HID light bulbs and suspect PCB-containing ballasts were also observed during the HBMS.

An Analysis of Brownfields Cleanup Alternatives (ABCA) was developed in May 2025. To address lead and arsenic contamination in soil at the property, the ABCA recommended either removal and proper disposal of the contaminated soil or capping the soil in place. To address petroleum contaminants in soil vapor, it was recommended to perform in-situ groundwater injections or conduct soil removal. Both alternatives also require the installation of vapor intrusion mitigation systems on future site structures to institute Activity and Use Limitations (AULs), and the development of Soil Management and Disposal Plans. Groundwater injections are proposed to coincide with closing the USTs in place, while soil excavation could occur in the case of UST removals. For hazardous building materials, it was recommended to completely remove all site structures and hazardous building materials with a licensed hazardous material abatement and demolition contractor. Alternatively, if the structures at the site want to be maintained and
Commercial (.53)
ID Number (if Applicable): 2429 Enrolled:


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Release 3.0.2