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Environmental Cleanup Site Information (ECSI) Database Site Summary Full Report - Details for Site ID 2335, North Ridge Estates Superfund Site

This report shows data entered as of October 21, 2021 at 5:41:24 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.

Note: DEQ may have posted online documents related to this site. If so, they would be available for viewing or downloading on ECSI Summary Page

Go to DEQ's Facility Profiler to see a site map as well is information on what other DEQ programs may be active at this site.

Site Photos

Click to View Photo Picture Date Caption Size
View Photo 04/23/1999 Concrete foundation with new home in the background. 170 Kb
View Photo 04/23/1999 Close-up of existing foundation. 186 Kb
View Photo 04/23/1999 Former base foundation in hillside. 168 Kb
View Photo 04/23/1999 Former base foundations with new home in the background looking east. 144 Kb
View Photo 04/23/1999 Remnants of former base with new home in the background. 170 Kb
View Photo 04/23/1999 Former base foundation with hydrant in the foreground. 169 Kb
View Photo 04/23/1999 Test pit. 186 Kb
View Photo 04/23/1999 Mound with MBK building in the background. 187 Kb
View Photo 04/23/1999 Remnants of former base in hillside. 162 Kb
View Photo 04/23/1999 MBK building. 162 Kb
View Photo 04/23/1999 Park at North Ridge Estate. 164 Kb
View Photo 04/23/1999 Map of former base. 79 Kb
View Photo 04/23/1999 Former base foundations looking north. 135 Kb
View Photo 04/23/1999 North Ridge Estates sign with former base foundation in the background. 142 Kb
View Photo 06/20/2008 Activity Based Sampling 1120 Kb
View Photo 06/30/2005 ACM pickup 37 Kb
View Photo 07/25/2016 Start of Remedial Action. 7678 Kb
View Photo 08/22/2011 example ACM 1299 Kb
View Photo 08/22/2011 ACM and contaminated soil removal 1072 Kb
View Photo 09/11/2011 Memorial Park Respository 2284 Kb
View Photo 09/12/2008 example of ACM 2053 Kb
View Photo 10/05/2005 ACM and contaminated soil removal 199 Kb
View Photo 10/08/2000 View of the site looking southwest. 116 Kb

General Site Information

Site ID: 2335 Site Name: North Ridge Estates Superfund Site CERCLIS No: 001002476
Address: North Ridge Drive and Hunters Ridge Klamath Falls 97601
  County: Klamath Region: Eastern
Other location information:
Investigation Status: Listed on CRL or Inventory
  Brownfield Site: No NPL Site: Yes Orphan Site: Yes Study Area: Yes
Property: Twnshp/Range/Sect: 38S , 9E , 15 Tax Lots: multiple
  Latitude: 42.2648 deg. Longitude: -121.7465 deg.  Site Size: 745 acres
Other Site Names:
  FUDS #F10OR0570
  Klamath Falls Marine Barracks
  Marine Recuperation Barracks
  Kingsley Firing Range Annex
  Oregon Technical Institute
  North Ridge Estates

Site Characteristics

General Site Description:
Site History: In July 1944, the U.S. Navy acquired 744.99 acres of land from private parties for use as a recuperation hospital for Marine Corps personnel and a perpetual easement for utilities. Records indicate that many improvements were constructed on the site, including quarters, hospital, rehabilitation school, administration building, storehouses, dispensary, laboratory, bakery, garage, gas filling station, stable, heating plant, guardhouse, firehouse, auditorium, swimming pool, "brig," and sanitary sewage treatment plant. In May 1946, the Navy declared the property surplus and the land was transferred to the War Assets Administration for disposal. The State of Oregon acquired the land in March 1947. The site was used for the initial location of the Oregon Technical Institute. Subsequently, the land was sold to private parties and the buildings removed.
Contamination Information: (4/30/1999 DMC/SAS) Inquiry forwarded to ER/SAS on potential assessments at a former military base that is currently being redeveloped into residential lots. ER/SAS site visit on 4/23/99. Area was formerly a Marine base built during 1943 to house soldiers suffering from Pacific Island diseases (malaria, filaria, and elephantiasis). According to information at the park dedicated to the base, nearly 5,000 Marine "incurables" were housed there between 1944 and 1946. Other information sources indicate the site was also used by the Oregon Institute of Technology.

(8/22/07 GW/SAS) North Ridge Estates (NRE) is an approximately 784-acre site in Klamath Falls. At one time, most of it (approximately 442 acres) was occupied by the Marine Recuperational Barracks (MRB), which was the source of asbestos contamination. In 1966, the U.S. sold the site to private entities; most MRB buildings were demolished by the 1980s. Home construction began in 1993; in June 2001, based on a complaint, DEQ began to investigate the asbestos issue, with the later assistance of the U.S. EPA. There are 23 households within the identified footprint of the contaminated area, and DEQ has been working with EPA to prevent human exposure to asbestos, access funds for soil/asbestos removals and long-term remedial strategies, and develop a framework to evaluate site risks.
Manner and Time of Release: Asbestos containing material (ACM) and associated friable asbestos in soils occurred via demolition of Marine Barrack facility buildings during the 1970s; 1980s; and, 1990s. Much of the ACM was spread laterally and/or land disposed at various locations by heavy equipment. This manner of disposal was non-compliant with a USEPA Order to the Responsible Party (MBK Partnership) issued in 1979. Subsequently, MBK Partnership developed North Ridge Estates subdivision over these areas in the early 1990s (wcw 6/2/04).
Hazardous Substances/Waste Types: serpentinite asbestos (chrysotile) and lesser amounts of amphibole asbestos (amosite).

(GW/SAS/6/2/04) The principal substance of concern is asbestos (serpentine and amphibole) in a friable state in the residential neighborhood referred to as North Ridge Estates. The source of friable asbestos is manifested as both asbestos-containing-material (ACM) and also as a repository for fibers in site soils.
Environmental/Health Threats:
Status of Investigative or Remedial Action: (April 2003) EPA Region 10's Removal Program is working with the site owner to address asbestos cleanup and related issues.

(1/14/04 WCW/SRS) EPA completed emergency removal assessment field work during the summer and fall of 2003, collecting many environmental samples to support a risk assessment.

(6/2/04 WCW/SRS) During March and April 2004, DEQ and EPA surveyed and comprehensively mapped resurfacing ACM. EPA required MBK Partnership to conduct additional removal actions in specific areas where pipe lagging and/or other ACM hot spots existed. In addition, this site is recommended for listing on both the CRL and Inventory.

(CW/SRS/3/30/05) USEPA has issued a Unilateral Administrative Order for Feasibility Study (3/15/05).

(11/1/07 KJR/SAS) 40 individual tax lots within the facility have been recommend for listing on the CRL/Inventory. The tax lots are: 3809-15A0 tax lots 304, 307, 1600, 1700, & 1800; 3809-15B0 tax lots 200, 400, 500, & 600; 3809-15C0 tax lots 100, 200, 300, 400, & 500; 3809-15D0 tax lots 500, 600, 700, 800, 900, 1000, 1100, 1200, 1300, 1400, 1500, 1800, 2500, 2600, 2700, 2900, 3000, 3100, 3200, 3300, 3400, 3500, 3600, 3700, 3800, & 3900.

(WCW/SRS 11/1/07) Site inspections of North Ridge Estates commenced during 2001 when DEQ received complaints about ACM presence. Remedial investigations began in earnest in a period beginning in 2003 until present, when it became apparent that ACM represented a significant potential threat to human health. Oregon Health Department in collaboration with the Center for Disease Control issued a Health Consultation at North Ridge Estates during 2003.

After initial site investigations were conducted by MBK Partners during 2004 and 2005 (under supervision by EPA and DEQ), a global litigation settlement was finalized in January of 2006. Under the terms of this settlement, a majority of existing North Ridge Estates home owners were permanently bought-out and property titles reverted to a U.S. District Court-appointed receivership. This Receiver was obligated to work closely with EPA and to maintain property values as caretaker in the interim. During this interim period (2003 through 2005), EPA and/or DEQ completed several IRAMs designed to mitigate for the presence of surficial ACM debris.

Beginning in 2006 through the present, EPA; its contractors; and, partner agencies have worked to complete site investigations and estimate risks associated with ACM and/or associated friable asbestos in bulk soils on affected properties. In addition, several community involvement meetings and stakeholder meetings have been conducted.

During August 2007 EPA management agreed to pursue the concurrent development of milestone project decision documents on an accelerated timeline. Currently, EPA with assistance of contractors and partner agencies, are pursuing these new project objectives and timelines.

During August 2007 EPA, DEQ, partnering agencies (CDC; OHD); EPA contractors (CDM; Syracuse Research); and the U.S. District Court Receiver established a new project strategy, which was subsequently endorsed by EPA Region 10 management. This strategy called for the concurrent development of key decision documents on an accelerated timeline. Beginning in early Fall 2007, EPA with assistance from partner agencies and its contractors will complete draft and final versions of the following documents, culminating with the expected issuance of a final Record of Decision in late Summer or early Fall 2008: Remedial Investigation; Community Involvement Plan; Remedial Action Alternative Technical Memorandum and Evaluation; Feasibility Study; Proposed Plan; and, Record of Decision. In addition, EPA is anticipating that it may be necessary to present one or more of these documents to the National Remedy Review Board.

(1/8/08 KJR/SAS) 40 individual tax lots within the facility were proposed for listing on the CRL/Inventory. The following 39 tax lots have been listed on the CRL/Inventory: 3809-15A0 tax lots 304, 307, 1600, 1700, & 1800; 3809-15B0 tax lots 200, 400, 500, & 600; 3809-15C0 tax lots 100, 200, 300, 400, & 500; 3809-15D0 tax lots 500, 600, 700, 800, 900, 1000, 1100, 1200, 1300, 1400, 1500, 1800, 2500, 2600, 2900, 3000, 3100, 3200, 3300, 3400, 3500, 3600, 3700, 3800, & 3900.

(WCW/SRS 3/08) As of March 2008, the USEPA has directed its contractor (CDM) to finalize both RI and FS reports. In addition, there is a carry-over of emergency removal funding from the time critical IRAM completed during September and October 2008 that is expected to be directed toward additional IRAM(s) during 2009.

During September and October 2008 the USEPA completed extensive time-critical IRAMs on several affected parcels under its emergency removal program. At least nine parcels were subject to source removal and a temporary onsite repository was constructed.

(8/20/13 KJR/SRS) EPA issued the following documents: the Remedial Investigation report (dated 1/18/2010); the Feasibility Study (dated 3/25/2010); the Proposed Plan (dated 4/2/2010); the Pre-Final Remedial Design; Basis of Design Report; and, Technical Specifications (dated 11/2012).

EPA issued the Record of Decision, North Ridge Estates Operable Unit 1 dated 9/2011. DEQ concurred with the selected remedy in a letter dated 9/16/2011.

(10/25/19 KJD/SRS) Remedial action was implemented by EPA in 2016 and completed by the end of 2018.

(3/31/21 KJD/SRS) All properties except Parcel BQ have deed restrictions or deed notices recorded with Klamath County. All properties except Parcel BQ have a non-engineered caps over residual contamination. All excavated ACM and asbestos contaminated soil were placed into two on-site repositories.

EPA is anticipated to transfer lead to DEQ in May 2021 for long term Operations and Maintenance of the cap and institutional controls. All receiver held properties have been sold. All previously vacant homes are owned and occupied by private parties.

EPA issued a No Further Remedial Action Planned determinations, for each property, in December 2020. DEQ issued a Conditional No Further Action determinations, for each property, in January 2021. DEQ performed an annual inspection the week of August 31, 2020 in accordance with the O&M Plan.

Select site documents may be viewed in the Site Document section of this database.
Data Sources: (GW/SAS/6/2/04) USEPA Order on Consent and Statement of Work (May 21, 2003). This Order contains 13 action items related to USEPA removal authority. Action item 14 is a streamlined risk assessment requested by MBK Partnership.
(CW/SRS/3/30/05) USEPA Unilateral Order (3/15/05-signed; Effective date: 4/4/05). This Administrative Order (CERCLA-10-2005-0090) is for Remedial Investigation/Feasibility Study, which is designed to indentify a long-term permanent remedy for asbestos-affected areas at North Ridge Estates subdivision and adjacent properties. Appendix A of this Order is a Statement of Work which identifies the scope of required investigation.

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
Site Screening recommended (EV) 04/23/1999 04/23/1999 Daniel Crouse SAS
Site added to database 04/30/1999   Daniel Crouse SAS
PRELIMINARY ASSESSMENT EQUIVALENT 11/21/2002 04/09/2003 Cliff Walkey SRS
EPA Removal Action 01/20/2003 07/31/2013 Cliff Walkey
RISK ASSESSMENT 03/20/2003 09/05/2011 Cliff Walkey
REMOVAL ASSESSMENT 04/09/2003 09/05/2011 Cliff Walkey FED
Site added to CERCLIS 05/21/2003 05/21/2003 FED
Institutional Control 05/08/2004 05/08/2004 Cliff Walkey SRS
Proposal for Confirmed Release List recommended 05/24/2004 05/24/2004 Cliff Walkey SRS
Proposal for Inventory recommended 06/01/2004 06/01/2004 Cliff Walkey SRS
Place on hold 11/22/2004 12/06/2005 Cheryl Dempsey SAS
Consent Decree 01/30/2005 12/28/2005 Cliff Walkey
Decision Not to List Site (on the CRL or Inventory) 12/06/2005 12/06/2005 Kathleen Daugherty SAS
PRELIMINARY ASSESSMENT EQUIVALENT 01/15/2006 01/15/2010 Cliff Walkey
FEASIBILITY STUDY 01/20/2006 03/05/2010 Cliff Walkey SRS
REMEDIAL INVESTIGATION 01/20/2006 01/18/2010 Cliff Walkey
ORPHAN SITE 02/16/2006 02/16/2006 Alan Kiphut LQ
Proposal for Confirmed Release List recommended 09/24/2007 09/24/2007 Cliff Walkey VCS
Proposal for Inventory recommended 09/24/2007 09/24/2007 Cliff Walkey VCS
Owner/operator comments received on listing notification 11/19/2007 11/19/2007 Kathleen Daugherty SAS
Owner/operator comments received on listing notification 11/29/2007 11/29/2007 Kathleen Daugherty SAS
Listing Review completed 01/08/2008 01/08/2008 Kathleen Daugherty SAS
Facility placed on Inventory 01/08/2008 01/08/2008 Kathleen Daugherty SAS
Facility placed on Confirmed Release List 01/08/2008 01/08/2008 Kathleen Daugherty SAS
REMEDIAL DESIGN 08/05/2011 01/31/2014 Kathleen Daugherty SRS
RECORD OF DECISION 09/05/2011 09/05/2011
National Priorities List Site 09/15/2011   Richard Pedersen
Periodic Review 05/23/2012 05/23/2012 Kathleen Daugherty SRS
REMEDIAL ACTION 05/01/2014 06/30/2021 EPA
Institutional Control 10/31/2016   Kathleen Daugherty SRS
Engineering Control 12/31/2018   Kathleen Daugherty SRS
Periodic Review 10/15/2019 09/30/2020 Kathleen Daugherty SRS
Periodic Review 09/30/2020   Kathleen Daugherty SRS
No Further Remedial Action Planned under Federal program 12/30/2020 12/30/2020
No Further Action (Conditional) 01/04/2021 01/04/2021 Kathleen Daugherty SRS
Periodic Review 06/02/2021  
OPERATION & MAINTENANCE  (Primary Action) 07/01/2021   Kathleen Daugherty SRS

Key to Certain Acronyms and Terms in this Report:

You may be able to obtain more information about this site by contacting Kathleen Daugherty at the Eastern regional office or via email at If this does not work, you may contact Ximena Cruz Cuevas (503) 229-6811, or via email at or contact the Eastern regional office.