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- Excavation and temporary use near public sewers
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Excavation and temporary use near public sewers
Last updated on August 15, 2022.
- When we perform the following drainage such as construction drainage and use public sewer temporarily, please submit public sewer temporary use permission application, and please receive permission of Mayor Public Works Office.
- （１） Spring water, rainwater, construction drainage associated with civil engineering and construction work (spring and rainwater use a pump with a pot).
（２） Drainage from temporary toilets and hand-washing areas installed in temporary offices.
（３） Accumulated water from caretaker holes such as telegraph telephone, electricity, gas, etc.
（４） Sewage drainage associated with other construction work.
In addition, when applying, the drainage method etc. must conform to the attached standards. In addition, waste equivalent to industrial waste cannot be drained. - When digging near the public sewer for civil engineering or construction work, if you are going to dig deeper than the drainage pipe, please submit the registration form near the public sewer.
- Drainage method
- （１） When discharging in a combined area, it flows directly into the connecting basin.
（２） When discharging in a diverted area, let it flow directly into the sewage connection basin.
（３） Drainage associated with construction on the road (including underground) can be connected to the human hole by laying the mounting pipe and flow in. However, please consult with Public Works Office about connection position, construction method, restoration method, etc.
（４） If there is no connection basin on or near the site, apply for self-financing at Public Works Office and install the connection basin and mounting pipe, and submit an application for temporary use. - Structure of drainage facilities, etc.
When draining construction drainage, etc., install drainage facilities as follows. (Excluding Temporary Office Miscellaneous Drainage and Temporary Toilet Drainage)
（１） Public sewerage facilities, road facilities, etc. that do not interfere with traffic.
（２） In the drainage facility, install a sedimentation tank that meets the following criteria.
A. A rectifier plate, cough, etc. will be provided so that no disturbance by running water will occur.
B. The sedimentation tank has two or more tanks
C. The average flow speed is 0.3 m/s or less in principle.
D. In principle, stay time is 30 seconds or more.
O. Mud can be more than 60cm
（３） When discharging alkaline or acidic sewage, set up a neutralization tank and adjust it before releasing it. In principle, the neutralization tank must have a function to automatically stop the power pump when the water quality exceeds the standard value.
（４） In principle, the sedimentation tank shall have a structure that can measure the flow rate. - Certification of water quality standards and amount of wastewater
（１） In addition to those listed in the following table, the water quality of drainage for construction is based on the ordinances related to the conservation of the Yokohama City Living Environment and the Yokohama City Sewerage Ordinance. Water quality should be inspected at any time, and appropriate management should be performed to comply with legal standards.
（３） If you violate laws and regulations or the above-mentioned standards and permission conditions, or if the city deems it necessary, you may rebuild, relocate or remove drainage facilities. In this case, the cost will be borne by applicant.Water quality standards for construction drainage, etc. Items Treatment area
(Inflow into the sewage treatment plant)Unprocessed area
(Not inflow into sewage treatment plants)Hydrogen ion concentration PH5 or more and 9 or less HP 5.8 or higher 8.6 or less Suspended substances
Bentonite
Other earth and sand, etc.6,000 ppm or less 70ppm or less - If the pipeline is blocked or damaged due to effluent such as construction drainage, restoration work costs for the facility will be collected. However, if there is an application for self-financing work from the causal person, the causal person must carry out the restoration work.
- Please apply for permission and notification procedures as follows.
Permit application and notification procedure Application documents Number of copies Date of submission Submission address Public sewer temporary use permission application 3 copies 14 days before release Public Works Office registration form, near the public sewer 2 copies 7 days before drilling Public Works Office
Inquiries to this page
Asahi Ward Asahi Public Works Office
Phone: 045-953-8801
Phone: 045-953-8801
Fax: 045-952-1518
E-Mail address [email protected]
Page ID: 708-080-511
