From 2011 to 2014, decontaminated soil and debris were incinerated all over Japan. Informations about the quantity incinerated nationwide during those years in various locations are hard to get. As of today incineration is still ongoing in Eastern Japan, but we do no know if it is still ongoing or not in other parts of Japan as somehow nothing is being published about it.
Incineration is never a solution for radiation contaminated waste, it reduces the volume of the contaminated waste but at the same time redistributes its contained radionuclides into the nearby environment, thus endangering the health of the people living there.
However, this article from September 2014 gives a list of the incineratition locations and of the disposal companies involved, among those Japan Environmental Safety Corporation (JESCO) was the most prominent, as JESCO was the company already handling most of the PCB waste disposal.
JESCO Hokkaido Office (Muroran City) ＪＥＳＣＯ北海道事業所（室蘭市）
Ecosystem Akita (Odate city) エコシステム秋田（大館市）
Kureha environment (Iwaki City, Fukushima prefecture) クレハ環境（福島県いわき市）
Tokyo Seaside Recycle Power (Koto Ward) 東京臨海リサイクルパワー（江東区）
JESCO Tokyo Office (Koto Ward) ＪＥＳＣＯ東京事業所（江東区）
Toyama Environment Improvement (Toyama City) 富山環境整備（富山市）
JESCO Toyota Plant (Toyota City, Aichi) JＥＳＣＯ豊田事業所（愛知県豊田市）
JESCO Osaka Plant (Osaka City) ＪＥＳＣＯ大阪事業所（大阪市）
KEIO GEORE (Amagasaki City, Hyogo) 関電ジオレ（兵庫県尼崎市）
Kobe Environment Creation (Kobe City) 神戸環境クリエート（神戸市）
Ecosystem Sanyo (Misaki Town, Okayama Prefecture) エコシステム山陽（岡山県美咲町）
Sanko (Sakaiminato City, Tottori Prefecture) 三光（鳥取県境港市）
Fuji Clean (Ayagawa Town, Aya Gun, Kagawa Prefecture) 富士クリーン（香川県綾歌群綾川町）
Ehime Prefecture Waste Treatment Center Toyo Works (Niihama City) 愛媛県廃棄物処理センター東予事業所（新居浜市）
Lightwork refining tobata manufacturing plant (Kitakyushu city, Fukuoka prefecture) 光和精鉱戸畑製造所（福岡県北九州市）
JESCO Kitakyushu Office$ ＪＥＳＣＯ北九州事業所