45.Report on environmental impact assessment of Sakae Factory Refurbishment Project, Environmental Business Bureau

No. 16 of the Review Board
December 14, 2000

Mr. Hidenobu Takahide, The Mayor of Yokohama

Yokohama City Environmental Impact Assessment Examination Committee
Chairman Yosuke Inokari

Investigation and deliberation on environmental impact assessment of "Environmental Business Bureau Sakae Factory Renovation Project" (Report)

As a result of careful investigation and deliberation of the titles that were consulted on March 24, 2000, Ring Protection Examination No. 197 and June 30, 2000, Ring Protection Examination No. 57, I have obtained the following conclusions and report.

1 Basic matters

（１） Environmental Business Bureau Sakae Factory Renovation Project (hereinafter referred to as “this project”)

• Full renewal of aging incineration facilities on the same scale
• Increase incineration ash and incinerated fly ash to detoxify, stabilize, and recycle resources, and to reduce the burden on the environment.
• Installation of state-of-the-art treatment facilities to strengthen environmental conservation measures, including controlling dioxins emissions.
• Increase power generation capacity for further effective use of thermal energy
• Increase the existing factory building for these facilities and expand the new building.

It's something to do.
Therefore, since this project is basically a renovation project, the amount of pollutants emitted into the environment will be reduced by introducing the latest equipment shown in the project plan and strengthening environmental conservation measures. However, given that it is located in a complex terrain and that it will operate for a considerable period of time after the renovation, it is important to carefully consider measures to minimize the environmental impact when renovating.

（２） As one of the factors that greatly affect the total amount of air pollutants, etc., the amount of waste and the quality of waste can be cited, it is necessary to further promote measures to reduce and recycle resources.

（３） In demolition work, there is a high possibility that harmful substances will be contained in the residuals inside the plant, and the amount of work is large. Therefore, during construction, due consideration should be given to the environmental impact on the surrounding area, and careful construction is required.

（４） Although the incineration residue treatment facility has a track record of operation in Japan, it has little experience of the same type and the same size. Therefore, when introducing it, it is necessary to grasp the amount of air pollutants generated and consider the exhaust gas treatment method accordingly. It is important to ensure safety, etc., and it is necessary to thoroughly consider from the planning stage based on the results of melting experiments.

（５） Regarding changes in the impact of the Sakae Plant on the atmospheric environment before and after the renovation, the analysis of current concentrations, differences in effective chimney heights, the increase of existing plant buildings, the effects of downstream vortex by the new building (downwash), the behavior of the transfer and diffusion of exhaust gas in complex terrain, and the degree of reduction in pollutant emissions were carefully examined.

• Regarding the current concentration, there was no clear effect on existing facilities based on analysis results by wind direction etc.
• Regarding the height of the effective chimney, the amount of exhaust gas increases after renovation, which is advantageous for the increase in exhaust gas, but on the other hand, due to a decrease in exhaust gas temperature and discharge speed, the effective chimney height is expected to be slightly lower overall.
• According to the wind tunnel model experiment, the degree of raising the existing factory building and the occurrence of down-washing and down-drafting by the new building is about the same as before renovation.
• Regarding the transfer and diffusion of exhaust gas, considering that the planned site is in complex terrain, we conduct wind tunnel model experiments and outdoor diffusion experiments, and estimate the ground concentration by numerical simulation using this information. In general, the maximum landing concentration is relatively likely to appear near the chimney in complex terrain, and such phenomena have been observed in outdoor diffusion experiments, but numerical simulations do not reproduce such trends. The maximum landing concentration near the chimney seems to have appeared in the current situation before the renovation, but since these are thought to be mainly due to topographic downdrafts, there is no reason to worsen this concentration especially after the renovation. However, further efforts are needed to improve the emission outline in order to reduce the maximum landing concentration in the vicinity as much as possible.
• Contaminant emissions are expected to be significantly improved as a result of comparing and examining the actual emissions before renovation with the management targets after renovation and the latest emissions at the Tsurumi and Asahi plants.

Based on the above, it is assumed that renovation will not deteriorate the air quality, but further efforts should be made in operation management, etc. to improve the surrounding air environment.

2. Individual matters

（１） Under construction

A. Air pollution, water pollution, waste and generated soil

(a) As measures to prevent the scattering of dust associated with demolition work, temporary enclosures around the outer periphery and watering water are listed.However, since there is a high possibility that harmful substances will be contained in the residues of the plant equipment, `` Waste Incineration Facility Demolition Prevention of Health Damage Due to Dioxins in Demolition Work "(Notice of Labor Standards Bureau No. 561 of the Department of the Department of the Department of the Department of the Department of the Department of the Department of the Department of the Department of the Department of the Ministry of the Department of the Department of the Ministry of the Ministry of the Ministry of the Ministry of Defense) and Labor) and comply with related to comply with related laws and regulations) and comply with related laws and regulations. In addition, work outdoors should be kept to a minimum.

(b) Since the Sakae Factory was built in the early 1950s, a thorough survey of the use of asbestos was conducted, and the locations used were described as "Guidelines for Renovation and Demolition of Buildings Using Asbestos (Asbestos) (Yokohama City Environmental Conservation Bureau) Properly process and dispose of it.

B. Local Communities
In the Bon and equinoctial week, where many visitors come to the adjacent cemetery, it is desirable to avoid traffic congestion and calm the cemetery, so consider the construction process and construction type at these times.

（２） At the time of existence and operation

A Air Pollution

(a) In order to improve the air environment around the planned site, it is necessary to further control the emission of pollutants. Therefore, always grasp the latest exhaust gas treatment technology and actively introduce technologies that can be introduced. In particular, careful consideration of incineration residue treatment facilities at the planning stage, including the treatment method before connecting to the incinerator flue.
In addition, strive for proper operation and management of incinerators, residue treatment facilities, and exhaust gas treatment equipment.

(b) In the plan, the effective chimney height is expected to decrease slightly compared to the current situation. In this location, it is considered that the topographical effect in the process of rising exhaust gas and the effect of proximity buildings will be large, so increase the effective discharge rate to avoid this as much as possible.

(c) In order to contribute to the improvement of the atmospheric environment in the surrounding area, it is desirable to introduce low-emission vehicles in garbage collection vehicles, relay transport vehicles, etc. Therefore, when renewing these vehicles, etc., strive to introduce low-emission vehicles fueled by natural gas, liquefied petroleum gas, and gasoline, and install exhaust particulate removal equipment for diesel vehicles that use light oil.

B. Plants and animals

The planned site is designated as a suburban green area conservation area, scenic area, etc., and it is hoped that the area will be greened as much as possible.

C Landscape

Considering that there are many green spaces around the planned site, it is necessary to consider the existence of artifacts such as buildings as little as possible in terms of landscape. Therefore, design should be devised for the existing factory building lifting section and new building, and color should be examined for buildings and chimneys including these.

D Safety

Since the incineration residue treatment facility operates a high-temperature melting furnace, it is necessary to give special consideration to disaster prevention. Therefore, in addition to known safety measures, thorough measures should be taken with reference to cases such as steel and aluminum smelting, which have similar electric melting furnaces.

3 Ex-post investigation

（１） Air pollution

Monitoring of the emission of air pollutants is carried out at the flue exit, but in order to comply with the management target values, in order to achieve lower concentration emissions, it is important to understand changes in the concentration of exhaust gas from the exit of the incinerator and the residue treatment facility to the flue exit, and to use it for operation management.
Therefore, at the beginning of operation, it is necessary to fully understand the behavior of exhaust gas according to operating conditions and analyze these results to utilize it for proper operation management.

（２） Soil contamination

Soil contamination surveys have not been mentioned as post-survey items, but since it is necessary to grasp the status of soil contamination in the area around the factory, conduct soil contamination surveys of dioxins before and after operation. The survey points should be discussed with related organizations as necessary.

Appendix

Regarding the following Mayor Kamakura's opinion, give due consideration when preparing the examination document.
Today, the amount of waste generated from local communities is increasing quantitatively and diversifying qualitatively. In these treatments, we strive to reduce the impact on the surrounding environment as much as possible. It is required to secure a comfortable living environment for local residents, such as by working to reduce waste generation, reduce and recycle resources. The facility is also close to the Kamakura city area, and there is a concern about its impact.In conducting the project, we will strive to provide accurate information to Kamakura citizens while considering the atmospheric environment etc. described in the environmental impact assessment report. Please make every effort to take measures to take appropriate measures if there is significant environmental impact that could not be predicted during construction or after the start of operation.

Progress of the survey and deliberation of the Yokohama City Environmental Impact Assessment Examination Committee

<Environmental Impact Assessment Survey Plan>

March 19, 1999 Business description (survey plan), deliberation, and on-site inspection
April 26, 1999 Business description (supplementary material), secretariat explanation (draft report) and deliberation

<Preparation for Environmental Impact Assessment>

March 24, 2000 Business description (preparation document) and deliberation
April 28, 2000 Selection of a statement of opinion
May 26, 2000 Statement of Opinion (6)

<Environmental Impact Assessment Report>

June 30, 2000 Confirmation of minutes of statement of opinion, explanation of business operator (evaluation report, supplementary material) and deliberation
July 27, 2000 Business description (supplementary materials) and deliberation
September 8, 2000 Business description (supplementary material, summary of citizen opinion and company opinion) and deliberation
October 26, 2000 Explanation of the secretariat (list of items to be considered) and deliberation
November 30, 2000 Explanation of the secretariat (draft report of the examination committee) and deliberation

List of supplementary materials submitted by the business operator to the Yokohama City Environmental Impact Assessment Examination Committee

1. About opinion on price statement and opinion of business operator
2. About garbage measure of Yokohama-shi
3. About seasonal fluctuations in garbage quality
4. Installation status of electrical melting equipment
5. About molten exhaust gas properties
6. Stability of molten solidified materials
7. Stability of molten fly ash
8. Safety measures for electrical melting equipment
9. Effective use of molten slag
10. About dioxin data of Yokohama-shi
11. About topographical section around the planned site
12. About the exhaust gas outline before and after the renovation
13. Predictive evaluation of air pollution
14. Noise generating equipment before and after renovation
15. About viewpoint of scenery

List of members of the Yokohama City Environmental Impact Assessment Committee

◎ Yosuke Inokari Lawyer
Goro Imai Professor, Yokohama National University
Miyoko Urushihara Environmental Designer
Professor, Izumi Okura, Yokohama National University
Shigetoshi Okuda Professor, Yokohama National University
○ Katsumi Saruta Professor Emeritus, Kanagawa University
Yoshiharu Shimizu Professor Emeritus, Kanagawa University
Kaeko Takai Lawyer
Naomi Tachibana Professor, Musashino Art University
Shigehiko Tamaru Associate Professor, Tokai University
Rikuo Doi Professor, Yokohama City University
Director of the Nakano Environmental Clinic, Aritomo Nakano
Nobuo Muto Professor Emeritus, Kanto Gakuin University
Minoru Moriguchi Counselor, Japan Meteorological Association
Mizuko Yoshiyuki Professor, Tokyo University of Agriculture
Makiko Watanabe Associate Professor, Tokyo Institute of Technology

◎ Chairman
○ Vice Chairman
Japanese syllabary title omitted