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Environmental Cleanup Site Information (ECSI) Database Site Summary Report - Details for Site ID 5546, Farmington Texaco (Former)

This report shows data entered as of February 3, 2023 at 1:49:44 AM

This report contains site details, organized into the following sections: 1) Site Photos (appears only if the site has photos); 2) General Site Information; 3) Site Characteristics; 4) Substance Contamination Information; 5) Investigative, Remedial and Administrative Actions; and 6) Site Environmental Controls (i.e., institutional or engineering controls; appears only if DEQ has applied one or more such controls to the site).  A key to certain acronyms and terms used in the report appears at the bottom of the page.

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Environmental Cleanup Site Information (ECSI) Database Site Summary Report - Details for Site ID 5546, Farmington Texaco (Former)

Site Photos
Click to View Photo Picture Date Caption Size
View Photo 07/31/2012 View of excavation of contaminated soil, performed in October, 2012. 652 Kb
View Photo 07/31/2012 View facing southwest. Site preparation for remedial action. 722 Kb
View Photo 11/14/2013 View of former location of gas station. Looking southwest from the corner of Farmington Road and Menlo Road. 68 Kb
View Photo 11/14/2013 View of former location of gas station (grassy lot behind Eichler Park sign). View facing east. 86 Kb

General Site Information

Site ID: 5546 Site Name: Farmington Texaco (Former) CERCLIS No:
Address: 13660 SW Farmington Rd. Beaverton 97005
  County: Washington Region: Northwest
Other location information: The Former Farmington Texaco site is located at 13660 SW Farmington Road in Beaverton. The approximate 0.5-acre site is bordered by SW Farmington Road to the north, SW Menlo Drive to the east and Eichler Park to the south and west.
Investigation Status: Listed on CRL or Inventory
Brownfield Site: Yes NPL Site: No Orphan Site: No Study Area: No
Property: Twnshp/Range/Sect: 1S , 1W , 16 Tax Lots: 2101
  Latitude: 45.487 deg. Longitude: -122.8176 deg.  Site Size: 0.5 acres
Other Site Names:
  Farmington Tire & Automotive
  David Ball
  Tualatin Hills Park & Recreation District

Site Characteristics

General Site Description: The Former Farmington Texaco site is located at 13660 SW Farmington Road in Beaverton. The approximate 0.5-acre site is bordered by SW Farmington Road to the north, SW Menlo Drive to the east and Eichler Park to the south and west. A closed culverted tributary to Beaverton Creek is immediately east of SW Menlo Drive, approximately 60 feet north and east of the site. The site is currently undeveloped, unpaved, and zoned by the City of Beaverton as General Commercial. This zoning allows for retail, professional services, parks and playgrounds, and urban residential housing. Future use will be expansion of Eichler park with a possible skate park, landscaping, and open lawn area.

The Former Farmington Texaco site was previously used as a retail petroleum fuel facility and automotive shop that operated until 1993. In February 1991, DEQ received complaints from local residents describing a petroleum odor and sheen entering a tributary of Beaverton Creek. DEQ required an investigation of the property to determine if a release of gasoline had occurred. Soil borings completed as part of the complaint investigation showed visual evidence of petroleum impacts. The site was entered into DEQ’s leaking underground storage tank (LUST) database and issued LUST # 34-91-0083 on February 8, 1991. The adminstrative file is located in the LUST files.

Tualatin Hills Parks and Recreation Department (THPRD) purchased the property under a Consent Judgment PPA with DEQ to expand the adjacent Eichler Park. A preliminary concept plan for the proposed park facilities includes the construction of a skate park.

Site History: The Former Farmington Texaco site was previously used as a retail petroleum fuel facility and automotive shop that operated until 1993. In February 1991, DEQ received complaints from local residents describing a petroleum odor and sheen entering a tributary of Beaverton Creek. DEQ required an investigation of the property to determine if a release of gasoline had occurred. Soil borings completed as part of the complaint investigation showed visual evidence of petroleum impacts. The site was entered into DEQ’s leaking underground storage tank (LUST) database and issued LUST # 34-91-0083 on February 8, 1991.
Beginning in 1991, a series of environmental investigations were conducted at the site to determine the extent and magnitude of soil and groundwater contamination. A number of soil removal actions and groundwater remediation and removal actions have been performed at the site. A brief description of these actions is described below.
February-March, 1991 Environmental Field Services (EFS) Investigation. EFS advanced five hand-auger soil borings on the property, as well as across SW Menlo Drive between the site and the tributary to Beaverton Creek. Petroleum impacted soil was observed in borings collected on the north, northeast and east sides of the property. No petroleum impacts were noted in borings collected southwest of the station building and between the site and the tributary to Beaverton Creek. Based on the observed petroleum impacts, an extraction sump was installed at the southeast corner of the operating UST nest. A 30-inch deep trench was excavated from the sump to the southeast corner of the station building for the installation of an air stripper and carbon treatment system. Impacted groundwater was pumped from the sump and treated prior to discharge to the adjacent storm sewer under a National Pollutant Discharge Elimination System (NPDES 1500-J) permit. Recovered gasoline product from the treatment system was stored in a 500-gallon waste oil underground storage tank (UST). As part of the EFS investigation, Petroleum Services Unlimited, Inc. (PSUI) inspected the UST product lines leading from the tank nest on the east side of the site to the dispenser island on the north side of the site. PSUI noted that the product lines were severely corroded and at least one fitting of the gasoline line had loosened under the east end of the dispenser island. PSUI removed petroleum-impacted soil and replaced the product lines. The site was entered into DEQ’s LUST database on February 8, 1991 and given LUST file number 34-91-0083.
In March, 1991, a groundwater monitoring program was initiated and three monitoring wells were installed on the northwest, northeast, and southeast corners of the property to depths of 20 feet bgs. The groundwater sample collected from the northeast corner of the site and immediately downgradient from the tank nest, contained benzene concentrations up to 12,000 ug/L.
On January 13, 1993, Neil Shaw Consulting Geologist, Inc. collected a water sample from a storm drain located at the intersection of SW Menlo and SW Farmington Road. The storm water sample analysis indicated the presence of benzene, toluene, ethylbenzene, and xylenes (BTEX). Due to the observed impact to the storm sewer, a collection trench was installed to a depth of 9 feet bgs between the UST nest and SW Menlo Drive. Recovered groundwater was treated using an on-site air stripper treatment system and discharged to the adjacent storm sewer system under a NPDES 1500-J permit.
On January 16, 1993, ES&T decommissioned and removed five USTs and their associated piping from the tank nest located on the east side of the site. During the decommissioning, 50 to 100-gallons of separate-phase gasoline product was removed from the tank nest. Concentrations of total petroleum hydrocarbons-gasoline (TPH-Gx) to 3,700 mg/kg were identified in soil samples collected from the tank nest excavation, with the highest concentrations collected from the floor and southern sidewall.
An air sparging (AS) system was installed at the bottom of the excavation between 12 and 13 feet bgs. Petroleum impacted soils from the excavation were returned to the tank nest following the UST decommissionings and installation of the AS. The complete duration of operation of the AS system is not known.
On March 31, 1997, K&S Environmental, Inc. installed eight soil borings (B-1 through B-8) on the north, northeast, and east sides of the site. TPH-Gx and benzene concentrations to 319 mg/kg and 6.28 mg/kg respectively, were detected immediately downgrandient of the former tank nest at a depth of 10 feet bgs. No groundwater samples were collected.
June-September 2003, ES&T Consulting, Inc.
Twelve soil explorations were advanced to depths of 20-25 feet bgs in June, 2003. TPH-Gx was detected in soil at levels up to 1,080 mg/kg at SB-4, located on the eastern side of the former building. Groundwater samples collected immediately downgradient from the former UST nest contained TPH-Gx to 140,000 ug/L.
In September, 2003 ES&T prepared a draft corrective action plan (CAP). The CAP was developed to evaluate: (1) the nature and distribution of TPH-Gx in soil and groundwater; (2) the seasonal elevation and direction of groundwater flow; (3) the expected public exposure to petroleum hydrocarbons from the site; and (4) evaluation of appropriate remedial activities. The CAP recommended an approach incorporating monitoring natural attenuation, hydraulic control and groundwater recovery, and ex-situ groundwater treatment. The CAP stated that monitoring wells MW-1 through MW-3 were decommissioned by over-drilling in 2003.
November 2007, Wohlers Envrionmental Services, Inc.
Wohlers submitted an Environmental Site Assessment Report (ESA) on November 30, 2007. The ESA summarized previous environmental assessment and cleanup activities and presented recommendations for follow-up environmental assessment.
On August 21, 2008, DEQ provided a list of eight comments, data gaps, and future actions for the site that recommended:
(1)Delineation of the full vertical and horizontal magnitude and extent of site-related contamination.
(2)Investigation of the source and/or pathway of gasoline originally discovered in the tributary to Beaverton Creek.
(3)Review of any other investigations or site reconnaissance performed along Beaverton Creek in the vicinity of the site.
(4)Review of previous investigations within or along the storm sewer lines adjacent to the site.
(5) Further investigation in the area north of the former service island and the area near the eastern property boundary.
(6)Further investigation near the former 500-gallon used oil UST.
(7)Review of current depth-to-groundwater measurements with those from previous investigations to identify potential smear zone contamination.
(8)A revised work plan to be submitted to DEQ for review and approval prior to implementation.
April 2009, Site Investigation (SI)Ash Creek Associates, Inc.
On April 17, 2009, a geophysical survey was performed to identify USTs and other buried features that were not identified during previous site investigation activities and to verify the locations of the former tank nest, former fuel island and former dewatering trench and sump. The survey identified the waste oil tank (located on the northwest side of the former building foundation), and verified the locations of the tank nest, fuel island, and dewatering trench.
Between April and May, 2009, Ash Creek collected soil and groundwater samples from 12 push-probe locations throughout the site. Results of the SI indicated petroleum impacted soil and groundwater in the vicinity of the former UST nest, former fuel island, and the northeast corner of the site. Specifically, elevated TPH-Gx and constituents were generally encountered near the soil-groundwater interface at approximately 7.5 feet bgs to 10 feet bgs at these locations. No separate-phase petroleum hydrocarbons were found in this investigation phase.
The SI concluded that the majority of contamination and associated risks were present in the northern portion of the site and within the area of the former tank nest. Additional assessment was recommended.
July 2009, City of Beaverton Sanitary Sewer Upgrade
Between July 14, 2009 and July 28, 2009, Ash Creek assisted the City of Beaverton with soil management activities during trenching along SW Menlo Drive. During excavation, soil was excavated to an approximate depth of 10.5 feet bgs and was continuously screened with a photoionization detector (PID). In addition, two composite soil samples were collected from locations within the trench and submitted for laboratory analysis of petroleum impacts. No indication of petroleum impacts was noted with the PID or with laboratory analyses. In addition, groundwater that seeped into the bottom of the excavation showed no field evidence of petroleum hydrocarbons.
In October, 2012, THPRD conducted remedial actions at the site that included removal of contaminated soil and groundwater, and application of ORC to excavated areas.
A Certificate of Completion and a conditional No Further Action determination was made available for public notice and comment in September, 2013. No comments were received.
The Certificate of Completion was filed with Washington County on Octopber 21, 2013. The site will be issued a Conditional No Further Action determination in October, 2013.
Contamination Information: Contaminants of interest (COI) at the site are petroleum compounds and their constituents including TPH-Gx, TPH-Dx, TPH-heavy oil (TPH-HO), BTEX, 1,2,4 trimethylbenzene, naphthalene, lead, ethylene dibromide, ethylene dichloride, metals, polycyclic aromatic hydrocarbons (PAHs) and volatile organic compounds (VOCs). All are apparently related to fuel or waste oil USTs that were formerly present at the site.

Soil. With the exception of the former fuel island area, the majority of the residual petroleum hydrocarbons in soil are located in the so-called groundwater “smear zone”. The smear zone is located in the range of five to ten feet bgs at the site, and is periodically inundated with water. The highest concentrations of petroleum hydrocarbons in soil are located in the former UST nest, the fuel island and the northeast corner of the property. The lateral extent of contamination in soil is estimated to extend approximately 10 to 15 feet into the SW Farmington Road and SW Menlo Road right-of-ways.

Within soil, TPH-Gx and Dx are present to maximum concentrations of 5,300 mg/kg and 2,960 mg/kg respectively, while elevated constituent concentrations including benzene and ethylbenzene were detected up to 27 mg/kg and 37.5 mg/kg, respectively. With the exception of arsenic in the former waste oil tank area, detected concentrations of contaminants in soil are below direct contact RBCs for excavation and construction worker receptors. One surface sample location near the former fuel island contains TPH-Gx above the direct contact and volatilization to outdoor air site-specific recreational park user RBCs. Concentrations of benzene and ethylbenzene are also above occupational vapor intrusion RBCs in subsurface soils.

Groundwater. Petroleum-impacted groundwater is present in the vicinity of the former service island, former waste oil tank, and former UST nest. Groundwater contamination is estimated to be impacting SW Farmington Road to the north and SW Menlo Road to the east.

TPH-Gx and benzene concentrations in groundwater are present at the northeast corner of the site to maximum concentrations of 140,000 ug/L and 23,000 ug/L, respectively. Groundwater concentrations of TPH-Gx, benzene and naphthalene exceed the direct contact RBC for excavation workers at multiple locations on the north and northeast sides of the property. Benzene concentrations exceed the occupational vapor intrusion RBC, however contaminant concentrations are below all site-specific recreational park user RBCs.

Surface Water. Storm sewer sampling conducted in 1993 showed petroleum impact to the storm water system in SW Menlo Drive. Since that time, the UST system was removed, an air-stripper and sump pump were installed in the tank nest, and a groundwater interceptor trench was constructed in the northeast portion of the site (between contamination and the shallower sewer below SW Menlo Drive). Although benzene concentrations up to 13,800 ug/L are present at the northeast corner of the property, the results of the 2010 storm water evaluation did not show any concentrations of petroleum hydrocarbons in the storm sewer. Excavation work completed in 2009 in the street, downgradient of the site, did not identify impacts to soil or grouindwater around the sewer prior to its point of discharge at (culverted) Beaverton Creek. Therefore, it appears that petroleum hydrocarbon migration into the tributary of Beaverton Creek, either within the sewer or in backfill around the pipe, is not occurring.
Manner and Time of Release:
Hazardous Substances/Waste Types: Contaminants present at the site include petroleum products, including gasoline, diesel, and heavy oil, PAHs, VOCs, and metals.
All are related to fuel or waste oil USTs that were formerly present at the site.

Levels of petroleum contaminants in soil are below applicable RBCs, including the site-specific park user RBC. Arsenic is present at depth above the construction worker RBC at the former waste oil tank area at the center of the property. If work is to be conducted in this area an environmental contractor must conduct oversite.

Levels of petroleum contamination in groundwater is likely present above excavation worker RBCs (particularly in the former tank nest area and into the right-of-way for SW Farmington Road). Adherence to the Contaminated Media Management Plan is required to address site risk and properly manage soil and groundwater during site redevelopment and maintenance.
Pathways: The following current and future potential human receptors were identified for risk-based screening:

• Recreational Park Users
• Occupational Workers
• Construction Workers
• Excavation Workers

The following is a summary of each of the applicable exposure pathways for soil and groundwater:

Soil

• Vapor Intrusion into Buildings: This pathway is considered potentially complete for occupational workers under a future use scenario. The Easement and Equitable Servitudes (EES), filed in 2011, restricts the construction of habitable structures on the site, thereby eliminating the pathway.

• Soil Ingestion, Dermal Contact and Inhalation: This pathway is considered complete for recreational users, occupational workers, construction workers and excavation workers under current and/or future use scenarios. Remaining levels of petroleum contamination in soil are at or below RBCs for recreational, occupational, construction worker and excavation worker site users. Levels of arsenic in subsurface soil (below 5 feet bgs) exceeds construction worker RBCs. Work performed in this area requires an environmental contractor, as is required in the Contaminated Media Management Plan (CMMP).

• Volatilization to Outdoor Air: This pathway is considered complete for recreational users, occupational workers, construction workers and excavation workers under current and/or future use scenarios. Risk associated with this pathway was not identified.

Groundwater

• Vapor Intrusion into Buildings: This pathway is considered potentially complete for occupational workers. The EES filed for the site restricts the construction of habitable structures on the property.

• Volatilization to Outdoor Air: This pathway is considered complete for recreational users and occupational workers. Risk associated with this pathway was not identified.

• Groundwater in Excavation: This pathway is considered complete for excavation workers. Levels of petroleum impacted groundwater are present above excavation worker RBCs in the former tank pit area and likely into the right-of-way at SW Farmington Road. Management of groundwater, notification, and properly trained personnel are required as per the CMMP.

Potable water is provided by the city in the immediate vicinity of the site and will likely continue for the forseeable future. Therefore, consumptive use of groundwater is not considered a complete exposure pathway.
Environmental/Health Threats:
Status of Investigative or Remedial Action: Selected Remedial Action:
• Excavation and off-site disposal of surface soil containing levels of petroleum contamination above recreational park user direct contact risk-based concentrations (RBCs).
• Excavation and off-site disposal of sub-surface soil to a depth of ten feet in the northeast corner of the site to remove source mass and address risk to excavation workers. As part of this work, a treatment compound will be applied to soil and groundwater to facilitate ongoing contaminant reduction.
• Recording of a institutional control with the property deed memorializing use of the site site as a park, prohibiting use of groundwater, and requiring worker notification and/or protection measures for excavation workers who might encounter soil or groundwater contamination in the northeast site corner.

The remedial actions were completed between June, 2011 and October, 2012 and are presented in the Removal Action Report, dated June, 2013.
Data Sources: Removal Action Report, THPRD Farmington Road Texaco Cleanup, Beaverton, Oregon; APEX, June 21, 2013.

Contaminated Media Management Plan, THPRD Farmington Road Texaco Cleanup, Beaverton, Oregon; APEX, June 21, 2013.

Ash Creek Associates, APEX, Removal Action Work Plan, THPRD Farmington Road Texaco Cleanup, Beaverton, Oregon. September, 19, 2012.

Ash Creek Associates, Inc. (Ash Creek), 2009a. Site Investigation Report, Metro Brownfields Recycling
Program, Former Farmington Texaco, Beaverton, Oregon. June 30, 2009.

Ash Creek, 2009b. Technical Assistance – SW Menlo Drive Sewer Trench, City of Beaverton, SW Menlo
Drive and SW Farmington Road, Beaverton, Oregon. Project No. 1661-00. August 31, 2009.

Ash Creek, 2010b. Field Brief for Phase II Investigation. April 29, 2010.

Ash Creek, 2010a. Quality Assurance Project Plan (QAPP) for the Metro Brownfields Recycling Program. May 2010.

Ash Creek, 2010c. Field Brief for Additional Activities. November 3, 2010.

Ash Creek, 2011. Revised Analysis of Brownfield Cleanup Alternatives, Former Farmington Texaco. March 11, 2011.

DEQ, 2002. Default Background Concentrations for Metals. Memorandum to ODEQ Cleanup Project
Managers. October 28, 2005.

DEQ, 2003. Risk-Based Decision Making (RBDM) for the Remediation of Petroleum-Contaminated Sites.
Oregon Department of Environmental Quality – Environmental Cleanup and Tanks Program –
Land Quality Division, Portland, Oregon. September 22, 2003. Updated (Spreadsheet)
September 15, 2009.

DEQ, 2008. Farmington Texaco, LUST Log 34-91-0083, Facility ID #4295, 13660 S.W. Farmington Road,Beaverton. Letter to Mr. Wahlid Mahmood. August 21, 2008.

Environmental Field Service, 1991. Farmington Texaco Gasoline Release, Remedial Response and Site
Assessment. March 20, 1991.

ES&T Consulting, Inc., 2002. Draft Workplan: Soil and Groundwater Investigation Activities, Former
Farmington Automotive Site, Beaverton, Oregon. December 8, 2002.

ES&T Consulting, Inc., 2003. Draft Corrective Action Plan, Former Farmington Automotive Site, Beaverton,Oregon. September 23, 2003.

K&S Environmental, Inc., 1997. Soil Sampling Results and Budget Cleanup Costs for Property Located at 13660 SW Farmington Road in Beaverton, OR. April 17, 1997.

Neil Shaw Consulting Geologist, Inc., 1993. Investigation and Cleanup Activities for the Period 1/13/93 to1/21/93 at Farmington Road, Beaverton, Oregon. January 22, 1993.

Wohlers Environmental Services, Inc., 2007. Environmental Site Assessment Report, Former Farmington
Texaco, 13660 SW Farmington Rd., Beaverton, OR. November 30, 2007.


Substance Contamination Information

Substance Media Contaminated Concentration Level Date Recorded
No information is available

Investigative, Remedial and Administrative Actions

Action Start Date Compl. Date Resp. Staff Lead Pgm
No Further Action (Conditional)  (Primary Action) 10/31/2013 10/31/2013 Rebecca Wells-Albers vcp
View Full Report Showing Action History

Site Environmental Controls

Control Description Begin Date End Date Last Reviewed By Last Review Date
Easement Equitable Servitude 06/03/2011 06/03/2011 Rebecca Wells-Albers 06/03/2011
  Comments: EES restriction on groundwater use and construction of habitable structures filed with Washington County on June 3, 2011.

Key to Certain Acronyms and Terms in this Report:

You may be able to obtain more information about this site by contacting Rebecca Wells-Albers at the Northwest regional office or via email at rebecca.wells-albers@deq.oregon.gov. If this does not work, you may contact Ximena Cruz Cuevas (503) 229-6811, or via email at ximena.cruzcuevas@deq.state.or.us or contact the Northwest regional office.