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Target facilities (buildings) Building for filtering process First floor of the building Building for drum washing process Second floor of the building 14 Target facilities (High temperature thermal destruction equipment) 15 Environmental assessment of the surrounding area (2014) On the boundaries of the Plant (4 points) : No PCBs detected Dioxin is less than the environmental standard Analysis of soil Target of survey PCBs Analysis of ambient air Dioxins (pg-TEQ/g) PCBs (μg/m3) Dioxins (pg-TEQ/m3) Elution (mg/ℓ) East Not detected Not detected 7.1 Not detected 0.029 West 〃 〃 5.4 〃 0.025 South 〃 〃 1.4 〃 0.035 North 〃 〃 1.3 〃 0.022 quantitation limit 0.1 0.0005 soil containment (mg/kg) Env. Standard 1000pg‐TEQ/g 0.05 Env. Standard 0.6 pg-TEQ/m3 16 Environmental assessment of High temperature thermal destruction facilities (2014) 付着物 高温熱分解施設 拭き取り試験 PCB:不検出 PCB:不検出 ダイオキシン:0.026 ng-TEQ/g ダイオキシン:0.058 ng-TEQ/g No.1~No.3 廃 PCB タンク タンク気相部 タンク気相部 タンク気相部 PCB:59 μg/m3 PCB:670 μg/m3 PCB:380 μg/m3 タンクエリア土間コンクリート 拭き取り試験 PCB:不検出 PCB:不検出(3ヶ所) 施設内土間コンクリート PCB:不検出(2ヶ所) ダイオキシン:0.0005 ng-TEQ/g No.4 廃 PCB タンク ドラム洗浄建屋 ろ過装置建屋 PCB:不検出 作業環境測定 タンク内気相部 PCB:260μg/m 拭き取り試験 各階の壁・床 PCB:検出(5μg/m3) 3 (作業環境評価基準以下) 作業環境測定 PCB:不検出 建屋内土間コンクリート PCB:不検出(2ヶ所) 図 2.2-1 対象施設の事前調査結果まとめ 1 17 Curing method ・Be sure to cover the whole surface of waste PCB storage tanks and drum washing building (covering the entire surface method) ・Curing must be formed in dual structure ・Set changing room (used for workers going in and out) and front room (used for vehicles going in and out) ・This curing method should be designed in compliance with “guidelines for structural performance of buildings with a limited term”. 18 Demolition work (1) Faithfully follow the “Outline on countermeasures against exposure to dioxins”, refer to the dismantling method manual and design the plan (2) Try hard to find the way without using fire (3) Put PCB waste to a sealed container like “bakkan” (detachable container) or oil drum shown below in the cured place (4) Below is the main steps for demolition work (high temperature decomposition facilities are demolished in regular way) Preceding work Set curing and environment related equipment ・Treat gas phase portion of equipment with activated charcoal ・Clean the bottom part of equipment Bakkan (detachable container) Conduct demolition work ( dismantle →store → carry ) Remove the inner sheet of curing Remove the curing and environment related equipment An oil drum 19 Storage and treatment of wastes (1) All the PCB wastes should be kept and managed in compliance with the law Any equipment with no PCBs detected should be disposed according to Waste Management and Public Cleansing Law (2) Estimated wastes containing PCBs 1) Waste PCBs supplying equipment within the area of high temperature thermal destruction facilities 2) No.1 – No.4 Waste PCBs tanks & drum washing building 3) Any devices which has contact with PCBs within the filtering device building (3) The storage cabinet to keep PCBs waste 1) Newly build a storage cabinet to keep PCBs waste near filtering device building 2) The storage cabinet should have the strong structure to bear against the estimated Earthquakes in Yamasaki Fault zone and Tsunami height of Nankai Trough Earthquake in Takasago city 3) The new storage cabinet should be designed and constructed along with the Building Structure Law (verify to be proof against Earthquakes in Yamasaki Fault zone) 4) Because the surroundings of the storage cabinet is located T.P.+3m or more, any estimated tsunami height of Nankai Trough Earthquake will not reach the area ( Prefecture : T.P. +2.3m, National government : T.P. +3m) 20 PCBs waste storage cabinet ・PCBs waste storage cabinet is planned to be constructed next to filtering device building Planned new PCBstorage 廃棄物保管庫 設置予定地 cabinet construction site Planned use as PCBto廃棄物保管庫 storageとして活用予定 cabinet Currently used as filtering device building Planned PCBs waste storage construction site 図 7.2-1cabinet PCB 廃棄物保管庫予定地 21 Environment Monitoring Plan (1) Environmental Survey of surrounding area Survey point target 4 points on the boundaries of the Plant soil Ambient air items Survey time (containment, Just before the beginning of preparatory work: once elution) During construction work: once (June) Dioxins After the PCBs waste storage related work completed: once ditto PCB concentration Dioxins PCBs (2) Environmental Survey of surrounding area of target facilities Survey point target 4 points on the soil outer periphery curing + 1 point at the outlet of negative pressure dust collector Ambient air items Survey time PCBs (containment, Just before the beginning of preparatory elution) work of demolition: once Dioxins During demolition work: once after 1 month passed & once (June) After demolition completed(after removal of curing etc.): once PCB concentration ditto Dioxins 22 Environmental survey ( Monitoring point) 全覆養生による養生範囲 通常養生による養生範囲 ドラム洗浄建屋 負圧集じん機 高温熱分解施設 No.1~No.3 廃 PCB タンク Area where target facilities located 建屋を利用した養生 Sampling points ろ過装置建屋 図 8-2 環境モニタリング地点(対象施設周辺)(1) 23