Target facilities (buildings)

First floor of the building Second floor of the building

Building for filtering process

1

Building for drum washing process

Target facilities (High temperature thermal destruction equipment) 　

2

3

Environmental assessment of the surrounding area (2014)

Target of survey

Analysis of soil Analysis of ambient air

PCBs Dioxins(pg-TEQ/g)

PCBs（ μg/m3)

Dioxins(pg-TEQ/m3 ）containment

(mg/kg)Elution (mg/ℓ)

soil

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 Env. Standard

1000pg TEQ/g‐ 0.05Env. Standard

0.6 　 pg-TEQ/m3

On the boundaries of the Plant (4 points) : No PCBs detected Dioxin is less than the environmental standard

4

Environmental assessment of High temperature thermal destruction facilities (2014)

1

図 2.2-1 対象施設の事前調査結果まとめ

No.1～No.3

廃 PCBタンク

高温熱分解施設

付着物

PCB：不検出

ﾀﾞｲｵｷｼﾝ：0.026 ng-TEQ/g

拭き取り試験

PCB：不検出

ﾀﾞｲｵｷｼﾝ：0.058 ng-TEQ/g

No.4廃 PCBタンク ドラム洗浄建屋 ろ過装置建屋

施設内土間コンクリート

PCB：不検出（２ヶ所）

建屋内土間コンクリート

PCB：不検出（２ヶ所）

拭き取り試験

各階の壁・床 PCB：不検出

作業環境測定

PCB：不検出

タンク内気相部

PCB：260μ g/m3

作業環境測定

PCB：検出（5μ g/m3）

（作業環境評価基準以下）

タンク気相部

PCB：59 μ g/m3

タンク気相部

PCB：670 μ g/m3

拭き取り試験

PCB：不検出

ﾀﾞｲｵｷｼﾝ：0.0005 ng-TEQ/g

タンク気相部

PCB：380 μ g/m3

タンクエリア土間コンクリート

PCB：不検出（３ヶ所）

5

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”. 　

6

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

Conduct demolition work( dismantle →store → carry )

Remove the inner sheet of curing

Remove the curing and environment related equipment

Bakkan(detachable container)

An oil drum

・ Treat gas phase portion of equipment with activated charcoal・ Clean the bottom part of equipment

7

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)

8

PCBs waste storage cabinet

図 7.2-1 PCB廃棄物保管庫予定地

PCB廃棄物保管庫設置予定地

PCB廃棄物保管庫として活用予定

・ PCBs waste storage cabinet is planned to be constructed next to filtering device building

Planned new storage cabinet construction site

Planned to use as storage cabinet

Planned PCBs waste storage cabinet construction site

Currently used asfiltering device building

9

Environment Monitoring Plan

Survey point target items Survey time

4 points on the boundaries of the Plant

soil

PCBs (containment, elution)Dioxins

Just before the beginning of preparatory work: onceDuring construction work: once (June)After the PCBs waste storage related work completed: once

Ambient air

PCB concentrationDioxins

ditto

Survey point target items Survey time4 points on the outer periphery curing + 1 point at the outlet of negative pressure dust collector

soil PCBs (containment, elution)Dioxins

Just before the beginning of preparatory work of demolition: onceDuring demolition work: once after 1 month passed & once (June)After demolition completed(after removal of curing etc.): once

  Ambient air

PCB concentrationDioxins

ditto

(1) Environmental Survey of surrounding area

(2) Environmental Survey of surrounding area of target facilities

10

Environmental survey ( Monitoring point)

図 8-2 環境モニタリング地点（対象施設周辺）(1)

ドラム洗浄建屋

高温熱分解施設

No.1～No.3廃 PCBタンク

ろ過装置建屋

全覆養生による養生範囲

通常養生による養生範囲

建屋を利用した養生

負圧集じん機

Area where target facilities located

Sampling points