Use of the former Koshiba Oil Storage Facility

Last Updated January 25, 2024

The former Koshiba oil storage facility returned in December 2005 is currently being developed as a city park in Environmental Planning Bureau.
※About maintenance contents, please see here (Environmental Planning Bureau homepage).

Main progress

October, 2004: The Japan-U.S. Joint Committee agreed to return a partial return.
October, 2005: The Japan-US Joint Committee agreed to return the entire land area and a part of the restricted waters.
December, 2005: Proposal on the use of the former site of the return facility (Yokohama City Return Facility Site Use Design Exploratory Committee)
December, 2005: The entire land area and part of the restricted water area have been returned.
January to March, 2006: Citizen questionnaire conduct for "proposal on the use of the former site of return facility"
June, 2006: Formulated guidelines for the return of U.S. military facilities
January, 2007: Formulated “Yokohama City U.S. Army Facility Return Site Use Action Plan (draft)”
January to February, 2007: We carry out citizen opinion offer for "Yokohama U.S. Army Facility Return Site Use Action Plan (draft)"
March, 2007: Formulated action plan to use the site of the Yokohama U.S. military facilities
November, 2007: The Ministry of Defense started soil contamination survey (document survey)
March, 2008: Formulated a basic plan to use the former site of Koshiba Oil Storage Facility
March, 2008: Ministry of Defense launched soil pollution survey (overview survey)
May, 2008: Received a report on soil pollution survey (materials, etc.)
May to June, 2008: We carry out citizen opinion offer for "Koshiba oil storage facility ruins use basic plan"
December, 2008: At the Kanto Regional Council of National Property, it was reported that it was appropriate to entrust the management of part of the state-owned land to Yokohama City as a tree-planting site commemorating the 150th anniversary of the opening of the port.
February, 2009: Started subcontracting management (planting area)
June, 2009: Held a forest tree-planting festival commemorating the 150th anniversary of the opening of the port
June, 2009: Received a report on soil pollution survey (overview survey)
October, 2009: Ministry of Defense launched soil pollution survey (detailed survey)
October, 2009: Held the 150th Anniversary Forest Tree Planting Festival (2nd)
June, 2010: Received a report on soil contamination survey (detailed survey)
February to March, 2011: Planting work on the site of the Nagahama Oil Pipeline (Nagahama Waterway)
February to March, 2012: The government has begun construction of soil pollution countermeasures
July 2012~: The government has begun monitoring surveys on groundwater
September, 2012: Proposal from the government for "Disposal of the former Koshiba Oil Storage Facility on National Land"
November, 2012: Response to the government regarding the “Free Loan of the former Koshiba Oil Storage Facility” proposed by the government
February, 2013: At the Kanto Regional Council of National Property, a report was made that it was appropriate to lend the national land of the former Koshiba Oil Storage Facility to Yokohama City free of charge as a city park site.
May to June, 2014: We carry out citizen opinion offer for "(tentative name) Koshiba oil storage facility ruins park basic plan (plan)"
July, 2014: Formulated “(tentative name) Koshiba Oil Storage Facility Site Park Basic Plan”
August, 2014: (Tentative name) Started environmental impact assessment procedures for the Koshiba oil storage facility site park
July, 2017: (Tentative name) The Koshiba Oil Storage Facility Site Park has been designated as a city planning park
August, 2017: (Tentative name) The Koshiba Oil Storage Facility Site Park was started.
September, 2017: Concluded a free loan agreement for state-owned land
July, 2021: A part of the first phase area has been opened to the public as "Koshiba Nature Park".

Basic Plan for the use of the former Koshiba Oil Storage Facility (March 2008)

(Full download the whole picture) Koshiba Oil Storage Facility Site Use Basic Plan (PDF: 7,161KB)

Public opinion offer leaflet (PDF: 2,390KB)

Soil Contamination Survey Report (Ministry of Defense)

Investigation report (May 2008) (To the South Kanto Defense Bureau website)
Overview Survey Report (June 2009) (To the South Kanto Defense Bureau website)
Detailed Survey Report (June 2010) (To the South Kanto Defense Bureau website)

Processing through free loan

Processing of the former Koshiba oil storage facility by free loan (August 2012) (PDF: 41KB)
Processing of the former Koshiba oil storage facility by free loan (Answer by Yokohama City in November 2012) (PDF: 42KB)
About notice for loan request such as unused state-owned land (February 2013) (PDF: 17KB)

(Tentative name) Koshiba Oil Storage Facility Site Park Basic Plan (July 2014)

(Tentative name) Koshiba Oil Storage Facility Site Park Basic Plan (PDF: 1,353KB)

※In addition, you can see (tentative name) Koshiba Oil Storage Facility Site Park here (Environmental Planning Bureau website).

Related press release materials

October 18, 2005: About agreement between the Japan-US Joint Committee on Return of Koshiba Oil Storage Facilities (PDF: 86KB)
November 11, 2005: About return date of Koshiba oil storage facility (PDF: 125KB)
November 11, 2005: About deputy mayor comment about return date of Koshiba oil storage facility (PDF: 8KB)
December 13, 2005: On Koshiba oil storage facility return day, director of Yokohama Defense Facilities Director visits the mayor. （PDF：53KB）
July 10, 2007: On Wednesday, August 22, we will hold a children's tour of the former Koshiba Oil Storage Facility as part of the children's adventure.
"Let's take a look! The U.S. military base!" (Old Koshiba Oil Storage Facility Children's Tour) will be held. （PDF：147KB）
April 16, 2008: We devised "Koshiba oil storage facility ruins use basic plan" (PDF: 69KB)
Public opinion offer leaflet (PDF: 2,390KB)
May 20, 2008: We received a report from the South Kanto Defense Bureau (on the homepage of the South Kanto Defense Bureau) regarding the results of soil pollution surveys (document surveys) at the former Koshiba oil storage facility.
About result of soil pollution investigation (survey such as documents) in former Koshiba oil storage facility (PDF: 223KB)
Outline of "Survey on Koshiba Oil Storage Facility Materials" (PDF: 1,004KB)
May 28, 2008: We will hold an on-site tour of the former Koshiba oil storage facility! （PDF：261KB）
June 27, 2008: We announced opinion offer result about use of ruins of Koshiba oil storage facility. （PDF：2,828KB）
June 10, 2009: We received a report from the South Kanto Defense Bureau (on the homepage of the South Kanto Defense Bureau) regarding the results of soil pollution survey (overview survey) at the former Koshiba oil storage facility.
About result of soil pollution investigation (summary investigation) in former Koshiba oil storage facility (PDF: 207KB)
Outline of soil pollution survey (overview survey) at the former Koshiba Oil Storage Facility (PDF: 1,065KB)
June 29, 2010: We received a report from the South Kanto Defense Bureau (on the South Kanto Defense Bureau website) regarding the final results of soil contamination surveys at the former Koshiba oil storage facility.
About the final result of soil pollution investigation in former Koshiba oil storage facility (PDF: 639KB)

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