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Environmental Cleanup Site Information (ECSI) Database Site Summary Report - Details for Site ID 795, Shadybrook Landfill

This report shows data entered as of April 26, 2018 at 6:20:15 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 795, Shadybrook Landfill

Site Photos
Click to View Photo Picture Date Caption Size
View Photo 04/18/2013 same 44 Kb
View Photo 04/18/2013 same 74 Kb
View Photo 04/18/2013 same 61 Kb
View Photo 04/18/2013 same and Craig Ware 64 Kb
View Photo 04/18/2013 same 61 Kb
View Photo 04/18/2013 same 74 Kb
View Photo 04/18/2013 same 91 Kb
View Photo 04/18/2013 same 77 Kb
View Photo 04/18/2013 same 67 Kb
View Photo 04/18/2013 same 76 Kb
View Photo 04/18/2013 same 85 Kb
View Photo 04/18/2013 same 45 Kb
View Photo 04/18/2013 same 80 Kb
View Photo 04/18/2013 same 45 Kb
View Photo 04/18/2013 same 61 Kb
View Photo 04/18/2013 same 78 Kb
View Photo 04/18/2013 same 93 Kb
View Photo 04/18/2013 same 89 Kb
View Photo 04/18/2013 same 97 Kb
View Photo 04/18/2013 same 97 Kb
View Photo 04/18/2013 same 63 Kb
View Photo 04/18/2013 same 66 Kb
View Photo 04/18/2013 same 66 Kb
View Photo 04/18/2013 new graded soil cap 66 Kb
View Photo 04/18/2013 erosion controls 96 Kb
View Photo 04/18/2013 same 74 Kb
View Photo 04/18/2013 new graded soil cap 64 Kb
View Photo 04/18/2013 new graded soil cap 73 Kb
View Photo 04/18/2013 new soil cap graded 72 Kb
View Photo 04/18/2013 vegetated soil pile 755 Kb
View Photo 04/18/2013 same 751 Kb
View Photo 04/18/2013 same 762 Kb
View Photo 04/18/2013 vegetation on former shooting range 766 Kb
View Photo 04/18/2013 vegetation on former shooting range 758 Kb
View Photo 04/18/2013 vegetation on former shooting range 748 Kb

General Site Information

Site ID: 795 Site Name: Shadybrook Landfill CERCLIS No:
Address: 27800 NW Truitt Rd. (approximate address) North Plains 97133
  County: Washington Region: Northwest
Other location information: About four miles northeast of North Plains, near the eastern hill crest overlooking McKay Creek drainage. Off Shadybrook Road, near the terminus of Truitt Road.
Investigation Status: Listed on CRL or Inventory
Brownfield Site: No NPL Site: No Orphan Site: No Study Area: No
Property: Twnshp/Range/Sect: 2N , 2W , 29 Tax Lots: 500 and 200 (T2N/R2W-S29)
  Latitude: 45.6343 deg. Longitude: -122.9561 deg.  Site Size: 40 acres
Other Site Names:
  Washington County Landfill

Site Characteristics

General Site Description:
Site History: Originally an unregulated open burning dump. Later used as Washington County's primary solid waste disposal site. Closed in 1971, then used as a firearm target range until 1988.
Contamination Information: (5/17/96 SMF/SAS) Shadybrook was a county-owned landfill that operated from 1955 to 1971 (operating as an open dump until 1962). The landfill was unlined, and the landfill surface undulates dramatically. The site has had several fires due to spontaneous combustion, the top layers are collapsing, and there have been odor problems. There have been leachate problems since the landfill was open. "Orange" leachate discharges to Jesus Creek through active seeps in a ravine near the landfill, and from the landfill itself. Orange deposits have been noted as far downstream as Jackson Road. Water quality has been analyzed a number of times, but hazardous constituents have not been characterized. The Washington County Sheriff's Office used the northeast part of the site as a target shooting range from 1971 to 1988. Spent lead bullets are present in surface and shallow subsurface soils in this part of the site. Lead from the bullets may contribute to groundwater contamination. Historic rodenticide application may have contaminated site or Jesus Creek. (11/12/04 AC/SRP) Fire debris buried at site was from a farm supply business and may have contained bulk pesticides. Fire debris generally contains elevated PAHs.
Manner and Time of Release: Leachate originating from unlined sanitary landfill and spent lead bullets. Time of release: 1953 to present.
Hazardous Substances/Waste Types: Unknown - county landfill. Spent lead bullets on soil surface, and in shallow subsurface soils near northeast end of site - bullets contain leachable lead. Lead also detected in groundwater discharging to Jesus Creek from off-site seeps. Also, a sizeable rat population at the landfill was completely eliminated and did not return following the county’s rodenticide application during the winter of 1962. It is not known which rodenticide was used, although its apparent effectiveness suggests the product was highly toxic, persistent, and widely applied. There is concern that residual rodenticide may still be present at the site, and in nearby Jesus Creek. Fire debris was brought to the landfill from a Hillsboro Farmers’ Coop fire. Although placed at an isolated location, the fire debris had not been properly buried and covered. Fire debris derived leachate apparently intercepted the stream on neighboring property through subsurface migration. Tests indicated that the surface water was discolored but non-toxic. Following the discovery, the county applied much more cover to the debris burial site, and excavated two leachate interception channels. There is no indication of how the county tested the contaminated surface water’s toxicity. The fire debris’ isolated burial location suggests it might have had unique characteristics that warranted special handling and confinement. Like most fire debris, the waste probably contained high concentrations of polynuclear aromatic hydrocarbons (PAHs). We do not known if the waste contained other toxic materials such as bulk pesticides or pesticide-treated seed grain. The fire debris leachate could have contained a broad variety of toxic substances.
Pathways: A Christmas tree farm borders the site along its western boundary. The areas to the immediate north, east, and south are forested. Individual residences are located nearby to the northwest and west, and more distantly to the south and southwest. An undeveloped county park is located to the northeast. Somewhat weathered "No Trespassing" signs are posted, but the fencing is nearly gone. Jesus Creek and area groundwater are used for domestic purposes. Jesus Creek is contaminated with metals which could affect a downstream domestic surface water intake. Groundwater contamination could represent a threat for nearby domestic wells. Lead in surface soils could represent a windblown or stormwater runoff threat for nearby residences.
Environmental/Health Threats:
Status of Investigative or Remedial Action: (5/17/96 SMF/SAS) Landfill wastes have not been well characterized, so the full range of potential contaminants to local groundwater or surface water has not been defined. Spent lead bullets should be removed from the site. Approximately 50 pounds of lead bullets were removed from soils by prison work crew, although lead-contaminated soil and additional spent bullets may remain.
(5/10/12 AC/SRS) The former shooting range had unacceptable concentrations of lead in soil. A soil cap was installed over the lead impacted soil. The cap was completed in September 2011. See GeoDesign, 2012. Construction Completion Report, Interim Remedial Action Measure. January 18.
Data Sources: 1) April 1990 "Potential Contamination by the Shadybrook Landfill" report. 2) Laboratory Data from the Oregon Sanitary Authority (1968-1971). 3) Laboratory Data from DEQ (1995). 4) Inspection reports. 5) Complaint form. 6) Site Sampling and Assessment Report, by ATC Environmental, 2/7/96, 7) Summary of spent bullet removal activities, by GeoDesign, May 2003. 8) Surface water and groundwater seep sampling report, by GeoDesign, December 2002.
9) September 20, 2004 Work Plan, Phase 1 Remedial Investigation, Former Shadybrook Landfill.
10) June 2005, Ecological Risk Assessment, SEE, Shadybrook Landfill.
11) Draft Remedial Investigation Report, July 5, 2005.
12) Interim Remedial Action Measures Work Plan, January 20, 2006.
13) June 19, 2006; Interim Remedial Action Measures Work Plan, Shadybrook Landfill.
14) June 28, 2006; RI Report Addendum.
15) Phase 2 Remedial Investigation, October 17, 2007.
16) Groundwater and Surface Soil Characterization, Former Shooting Range at the Former Shadybrook Landfill, January 26, 2007.
17) Interim Remedial Action Measure Final Design Document, October 6, 2008.
18) October 17, 2009; Addendum 1 - Phase 2 RI Report.
19) Human Health and Ecological Risk Assessment, December 2010.

Substance Contamination Information

Substance Media Contaminated Concentration Level Date Recorded
ALUMINUM Groundwater 20 ppm in groundwater seeps that feed Jesus Creek. 8/25/1995
BARIUM Groundwater 0.50 ppm in groundwater seeps to Jesus Creek 8/25/1995
BARIUM Surface Water 0.05 ppm in Jesus Creek surface water. 0.30 ppm in west ravine surface water. 8/25/1995
CHROMIUM Groundwater 0.02 ppm in groundwater seeps that feed Jesus Creek. 8/25/1995
IRON Surface Water 1.15 ppm in upstream Jesus Creek surface water 9/5/2002 8:15:22 AM
LEAD Groundwater 0.01 mg/l in groundwater seeps 8/25/95. 0.025 mg/l in seeps 9/11/96. 8/25/1995
LEAD Other 920 mg/l leachable lead in surface soils. 1.2- to 32 mg/l leachable lead in two samples collected a 1 foot bgs in 1,000 square foot shooting range. 8/25/1995
LEAD Soil Eight soil samples with range of 690- to 4,200 ppm in 1,000 square foot shooting range area. Preliminary Remediation Goal for lead in residential soils is 400 ppm. DEQ Level II soil Eco Risk Screening Levels: 16 ppm for birds, 50 ppm for plants. 9/11/1996
LEAD Surface Water Surface water concentration (0.03 ppm) exceeds DEQ Level II Ecological Risk Assessment Screening Benchmark Value for freshwater aquatic life of 0.0025 ppm. 9/11/1996
MANGANESE Groundwater 2.3 ppm in groundwater seeps that drain to Jesus Creek, east side of landfill. DEQ Eco Level II Screening Value for freshwater aquatic life is 0.12 ppm. 8/25/1995
MANGANESE Surface Water 0.14 ppm in Jesus Creek Surface Water; 1.0 ppm in surface water in site's west ravine. DEQ Level II Eco Screening Value for freshwater aquatic life is 0.12 ppm. 8/25/1995

Investigative, Remedial and Administrative Actions

Action Start Date Compl. Date Resp. Staff Lead Pgm
No Further Action (Conditional)  (Primary Action) 04/18/2013 08/15/2013 Anna Coates VCP
View Full Report Showing Action History

Site Environmental Controls

Control Description Begin Date End Date Last Reviewed By Last Review Date
Cap, engineered 09/30/2011 09/30/2011 Anna Coates 09/27/2012
  Comments: Soil cap construction over former shooting range began in August 2011 and was completed by the end of September 2011. Elevated lead concentrations were covered with a minimum of 3 feet of clean soil.
Cap, engineered 02/15/2013   NA
  Comments: Soil cap over approximate 22 acre Washington County former Shadybrook municipal solid waste landfill.
Easement Equitable Servitude 07/11/2013   A. Coates, DEQ
  Comments: The ROD and subsequent Long Term Monitoring and Maintenance Plan dated June 24, 2013 for the Property requires: Annual inspections and maintenance (as necessary) of: 1) the soil cap on the former shooting range and the soil cap on the former landfill to check for areas of erosion, slope instability, settling, or exposed refuse; 2) tree plantings to check for adequate growth and evidence of disease or damage; and 3) the understory vegetative cover to check for the return of undesirable vegetation and invasive plants. EQUITABLE SERVITUDES (REQUIRED ACTIONS AND RESTRICTIONS ON USE) a) Groundwater Use Restrictions. Owner may not extract through wells or by other means or use the shallow groundwater at the Property for consumption or other beneficial use. This prohibition does not apply to extraction of groundwater associated with groundwater treatment or monitoring activities approved by DEQ or to temporary dewatering activities related to construction, development, or the installation of sewer or utilities at the Property. Owner must conduct a waste determination on any groundwater that is extracted during such monitoring, treatment, or dewatering activities and handle, store and manage waste water according to applicable laws. Owner may extract groundwater from a deeper aquifer provided: (a) the well is located at least 100 feet from the edge of the contaminated shallow groundwater; (b) the well is located hydraulically upgradient of the contaminated groundwater; and (c) the well is constructed with a deep annulus seal. The location and construction of the well must be approved by DEQ before the well is installed. b) Soil Cap Engineering Control. Except upon prior written approval from DEQ, Owner may not conduct or allow operations or conditions on the Property or use of the Property in any way that might penetrate any soil cap at the Property or jeopardize the soil cap's protective function as an engineering control that prevents exposure to contaminated soil, including without limitation any excavation, drilling, scraping, or uncontrolled erosion. Owner will maintain the soil cap in accordance with the monitoring and maintenance plan as specified in Section 4.2 of DEQ’s June 14, 2012 Selected Removal Measures Decision Document and subsequent Long Term Monitoring and Maintenance Plan dated June 24, 2013 approved in writing by DEQ. c) Land Use Restrictions. The following operations and uses are prohibited on the Property: 1) Residential use of any type; and 2) Agricultural (food crop) use of any type. d) Use of the Property. Owner may not occupy or allow other parties to occupy the Property unless the controls listed in this Section are maintained.

Key to Certain Acronyms and Terms in this Report:

You may be able to obtain more information about this site by contacting Anna Coates at the Northwest regional office or via email at If this does not work, you may contact Gil Wistar at (503) 229-5512, or via email at or contact the Northwest regional office.