Question: Port Chicago disaster occurred in this town in what county of California?

Context paragraphs:
Hurricane Creek mine disaster: The Hurricane Creek mine disaster occurred on December 30, 1970, shortly after noon, and resulted in the deaths of 38 men.  As was often pointed out in coverage of the disaster, it occurred a year to the day after the passage of the Coal Mine Safety and Health Act of 1969.  Recovery was complicated by the fact that a foot of snow fell on the rural mountain roads at the time of the accident.

Port Chicago, California: Port Chicago was a town on the southern banks of Suisun Bay, in Contra Costa County, California.  It was located 6.5 mi east-northeast of Martinez, at an elevation of 13 feet (4 m).  It is best known as the site of a devastating explosion at its Naval Munitions Depot during World War II.

Saint-Étienne-en-Dévoluy cable car disaster: The Saint-Étienne-en-Dévoluy cable car disaster occurred on 1 July 1999 in Saint-Étienne-en-Dévoluy, France, when a gondola which was being operated on a privately owned aerial tramway detached from the cable it was traveling on, and fell into the valley below.  The accident killed all twenty people on board.  The death toll was equivalent to that of another cable car accident in Italy which occurred one year previously.  The disaster remains the deadliest cable car accident in France, and one of the deadliest such incidents anywhere in the world.

Port Chicago Naval Magazine National Memorial: The Port Chicago Naval Magazine National Memorial is a memorial dedicated in 1994 recognizing the dead of the Port Chicago disaster, and the critical role played by Port Chicago, California during World War II, in serving as the main facility for the Pacific Theater of Operations.  The memorial is located at the Concord Naval Weapons Station near Concord, California, in the United States.

1988 Kathmandu stadium disaster: The Kathmandu Stadium Disaster occurred on 12 March 1988 at the Dasarath Rangasala Stadium in Kathmandu, Nepal during an association football match between "Janakpur Cigarette Factory Ltd" and "Liberation Army" of Bangladesh for the 1988 Tribhuvan Challenge Shield.  At least 80 people were killed and 100 more were injured when fans attempted to flee from a hail storm inside the national Dasarath Rangasala Stadium.  The Kathmandu stadium disaster is the 9th biggest stadium disaster until 2006(in terms of human loss, 80 spectators died), and the worst stadium disaster in Nepal.

West Pharmaceutical Services explosion: The West Pharmaceutical Plant explosion was an industrial disaster that occurred on January 29, 2003 at the West Pharmaceutical Plant in Kinston, North Carolina, United States.  Six people were killed and thirty-six people were injured when a large explosion ripped through the facility.  Two firefighters were injured in the subsequent blaze.  The disaster occurred twelve years and 170 mi from the 1991 Hamlet chicken processing plant fire, America's second-worst industrial disaster.

Mutiny (1999 film): Mutiny is a 1999 television drama film based on the story of the Port Chicago disaster during World War II where 50 African-American sailors were accused of mutiny because they declined to continue loading munitions after an explosion caused by failures in training and management.

Sea Wing disaster: The "Sea Wing" disaster occurred on July 13, 1890 when a strong squall line overturned the excursion vessel "Sea Wing" on Lake Pepin near Lake City, Minnesota.  Approximately 215 people were aboard the vessel when it overturned and as a result of the accident 98 passengers drowned.  An excursion barge that was being towed by the "Sea Wing" was either cut loose or broke loose and survived the disaster with its passengers unharmed.  It is one of the worst maritime disasters that has occurred on the upper Mississippi River.

Port Chicago disaster: The Port Chicago disaster was a deadly munitions explosion that occurred on July 17, 1944, at the Port Chicago Naval Magazine in Port Chicago, California, United States.  Munitions detonated while being loaded onto a cargo vessel bound for the Pacific Theater of Operations, killing 320 sailors and civilians and injuring 390 others.  Most of the dead and injured were enlisted African American sailors.

Masbrough boat disaster: The Masbrough boat disaster (also known as the Rotherham boat disaster and the Masbrough ship disaster) was a disaster that occurred in a boatyard on the River Don in Masbrough, South Yorkshire, now a suburb of Rotherham, on 5 July 1841.  The disaster occurred during the launching of a new boat: sixty-four people, mainly children were drowned in the river.

Supporting paragraphs: Port Chicago, California Port Chicago disaster
Answer: Contra Costa County