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- Guidance on groundwater pollution countermeasures
Here's the text.
Guidance on groundwater pollution countermeasures
Last update date April 2, 2024
Yokohama City provides guidance to persons responsible for groundwater pollution based on the ordinance on conservation, etc. (hereinafter referred to as the "Ordinance") in Yokohama City Living Environment.
Notification regarding groundwater pollution countermeasures
Those who are conducting business on land that is deemed to be the cause of groundwater pollution, conduct a survey on the cause of groundwater contamination based on Article 61-2 of the Ordinance. May be instructed. In such a case, the Company shall endeavor to report the cause of groundwater pollution to Yokohama City.
In addition, based on the ordinance Article 61-3, measures to purify the quality of groundwater must be taken, and in that case, it is necessary to submit a groundwater purification measure result report to Yokohama City.
Report style
In principle, all administrative documents such as the registration form are subject to disclosure. Please read "Handling of Administrative Documents associated with the Information Disclosure System" before making registration form.
registration form, please submit at window, mail or Yokohama-shi electronic application, report system (outside site). In addition, when submitting by mail or electronic application, be sure to consult with the contents of the notification in advance by e-mail etc.
| Number | Name | Grounding provisions | Style | Reference materials |
|---|---|---|---|---|
| 1 | Investigation of the Cause of Groundwater Pollution | Ordinance Article 611-2, Paragraph 2 | Detailed Regulations No. 5 style (word: 27KB) | Example of entry (PDF: 275KB) |
| 2 | Results of groundwater purification measures | Ordinance, Article 61-3, Paragraph 2 | Detailed Regulations No. 7 style (word: 31KB) | Example of entry (PDF: 279KB) |
※Detailed Regulations No. 6 form is missing.
Groundwater purification standards
Ordinance enforcement regulations separate table 15 (outside site), we establish groundwater purification standards for underground penetration. For points that exceed the groundwater purification standards, guidance is provided to the cause of pollution based on the ordinance.
| Types of Substances Substances | Standard value | Remarks |
|---|---|---|
| Cadmium and its compounds | As cadmium 0.003 | Amended on October 1, 2012 0.01 before amendment |
| Cyanide compounds | It should not be detected. | None |
| Organic phosphorus compounds (limited to parathion, methylparation, methyldi Meton and EPN) | It should not be detected. | None |
| Lead and its compounds | As lead 0.01 | None |
| Hexavalent chromium compounds | As hexavalent chromium 0.05 | None |
| Arsenic and its compounds | As arsenic 0.01 | None |
| Mercury, alkyl mercury and other mercury compounds | As mercury 0.0005 | None |
| Alkyl hydrocarbon compound | It should not be detected. | None |
| Polychlorinated biphenyl | It should not be detected. | None |
| Trichloroethylene | 0.01 | Amended on October 21, 2015 Before amendment 0.03 |
| Tetrachloroethylene | 0.01 | None |
| Dichloromethane | 0.02 | None |
| Carbon tetrachloride | 0.002 | None |
| 1,2-dichloroetan | 0.004 | None |
| 1,1-dichloroethylene | 0.1 | None |
| 1,2-dichloroethylene | As the total amount of ciss and transformers 0.04 | Amended on October 1, 2012 Previously revised "cis-1,2-dichloroethylene: 0.04" |
| 1,1,1-trichloroethane | 1 | None |
| 1,1,2-trichloroethane | 0.006 | None |
| 1,3-dichloropropen | 0.002 | None |
| Tiuram | 0.006 | None |
| Zemadine | 0.003 | None |
| Thiobencarb | 0.02 | None |
| Benzene | 0.01 | None |
| Selenium and its compounds | As selenium 0.01 | None |
| Boron and its compounds | As boron １ | None |
| Fluorine and its compounds | As fluorine 0.8 | None |
| Ammonia, ammonium compounds, nitrite compounds and nitrate compounds | Nitrite nitrogen and nitrate Total amount of acidic nitrogen 10 | None |
| Dioxins | 1 | None |
| Vinyl chloride monomer | 0.002 | October 1, 2012 New additions |
| 1,4-dioxane | 0.05 | October 1, 2012 New additions |
(Unit mg/L, pg-TEQ/L for dioxins)
[Remarks]
- "Not detected" means that when measured by the method listed in the measurement method column, the result is below the quantitative limit of the method.
- For dioxins, it applies only to those pertaining to establishments that are subject to the dioxin regulation standards specified in Appendix 11.
※About the details of remarks, please see regulations enforcement regulations separate table 11 about conservation of Yokohama-shi living environment.
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For inquiries to this page
Yokohama City Green Environment Bureau Environmental Conservation Department Water and Soil Environment Division
Phone: 045-671-2494
Phone: 045-671-2494
Fax: 045-671-2809
Email address: mk-dojo@city.yokohama.lg.jp
Page ID: 294-458-591
