Environmental Permit No. EP-303/2008

環境許可證編號EP-303/2008

ENVIRONMENTAL IMPACT ASSESSMENT ORDINANCE

(CHAPTER 499)

SECTION 10

環境影響評估條例

(499)

10

 

ENVIRONMENTAL PERMIT TO CONSTRUCT AND OPERATE

A DESIGNATED PROJECT

建造及營辦指定工程項目的環境許可證

  

PART A (MAIN PERMIT)

A (許可證主要部分)

 

Pursuant to Section 10 of the Environmental Impact Assessment Ordinance (the Ordinance), the Director of Environmental Protection (the Director) grants this environmental permit to the Drainage Services Department (hereinafter referred as the "Permit Holder") to construct and operate the designated project described in Part B subject to the conditions specified in Part C. The issue of this environmental permit is based on the documents, approvals or permissions described below:

 

根據環境影響評估條例(本條例)10條的規定,環境保護署署長(署長)將本環境許可證批予渠務(許可證持有人)以建造及營辦B 所說明的指定工程項目,但須遵守C 列明的條件。本環境許可證依據下列文件、批准或許可而簽發﹕

 

 

Application No.

申請書編號

AEP-303/2008

 

Document in the Register:

登記冊上的文件:

 

1.  Drainage Improvement in Sha Tin and Tai Po - Design and Construction : Final Environmental Impact Assessment (EIA) Report, Environmental Monitoring and Audit (EM&A) Manual, and EIA Report Executive Summary

 

(Register No. AEIAR-110/2007)  [Hereafter referred to as "the EIA Report"]

 

1.  沙田及大埔雨水排放統改善計劃 - 設計及建造 : 環境影響評估報告, 環境監察審核手冊 及評估報告摘要

 

(登記冊檔號: AEIAR-110/2007)  [下稱環評報告”]

 

 

2.  The Director’s letter of approval of the EIA Report dated 9 August 2007, (ref. (24) in EP 2/G/I/117 Pt.3)

 

2.  署長於200789日發出該環評報告的批准信,檔案編號: (24 in EP 2/G/I/117 Pt.3)

 

3.   Documents attached to the Application for Environmental Permit submitted by the Permit Holder on 28 January 2008 (Application No. AEP-303/2008) [Hereinafter referred to as the "Application"]

 

3.   許可證持有人2008 128日 提 交 的 環 境 許 可 證 申 請 書夾附的文件 (申請書編: AEP-303/2008) [ ]

 

 

 

 

  

 

 

 

 

 

25 February 2008

 

Date

日期

 

(Maurice K.L. YEUNG)

Principal Environmental Protection Officer

(Assessment and Noise)

for Director of Environmental Protection

環境保護署署長

(首席環境保護主任(評估及噪音) 楊國良代行

 

 

 

 
PART B (DESCRIPTIONS OF DESIGNATED PROJECT)

B (指定工程項目的說明)

 

Hereunder is the description of the designated project mentioned in Part A of this environmental permit:

 

下列為本環境許可證A 所提及的指定工程項目的說明:

 

Title of Designated Project

指定工程項目的名稱

Drainage Improvement Works in Sha Tin and Tai Po

[The project is hereinafter referred to as "the Project".]


於沙田及大埔進行的雨水排放改善工程

[上述工程項目下稱"工程項目" ]

 

Nature of Designated Project
指定工程項目的性質

Drainage improvement works partly in an existing conservation area.

部份雨水排放改善工程於現有的自然保育區內進行

 

Location of Designated Project

指定工程項目的地點

Shuen Wan area, Tai Po.
大埔船灣區

 

Figure 1 attached to this Permit shows the locations of the Project.

工程項目的位置載於本許可證的附圖一

 

Scale and Scope of Designated Project

指定工程項目的規模和範圍

 

The scope of the Project includes the following works:-

 

(i)         about 1,100 m of twin-cell box culvert with internal cell dimensions of 3m (in width) by 3m (in height) along Tung Tsz Road;

(ii)        about 280m of drainage pipe with diameter of 1.2m near Wai Ha Village;

(iii)      about 260m of drainage pipe with diameter of 1.8m along Ting Kok Road;

(iv)      an automatic mechanical penstock at Wai Ha River estuary; and

(v)       a stormwater pumping station of about 10m high at Shuen Wan.   

              

工程項目的範圍包括下述工程 :

 

(i)         沿洞梓路建造長約1,100米、內槓3米、高3米的雙管道箱形暗渠; 

(ii)        近圍下村建造長約280米、直徑1.2米的排水管;

(iii)      沿汀角路建造長約260米、直徑1.8米的排水管;

(iv)      在圍下河河口建造機動水閘; 以及

(v)       船灣建造雨水泵房、高約10米。

 

 
PART C (PERMIT CONDITIONS)

 

1.         General Conditions

 

1.1       The Permit Holder and any person working on the Project shall comply with all conditions set out in this Permit. Any non-compliance by any person may constitute a contravention of the Environmental Impact Assessment Ordinance (Cap. 499) and may become the subject of appropriate action being taken under the Ordinance.

 

1.2       The Permit Holder shall ensure full compliance with all legislation from time to time in force including, without limitation to, the Noise Control Ordinance (Cap. 400), Air Pollution Control Ordinance (Cap. 311), Water Pollution Control Ordinance (Cap. 358), Dumping at Sea Ordinance (Cap. 466) and Waste Disposal Ordinance (Cap. 354). This Permit does not of itself constitute any ground of defence against any proceedings instituted under any legislation or imply any approval under any legislation.

 

1.3       The Permit Holder shall make copies of this Permit together with all documents referred to in this Permit or the documents referred to in Part A of the Permit readily available at all times for inspection by the Director or his authorised officers at all sites/offices covered by this Permit. Any reference to the Permit shall include all documents referred to in the Permit and also the relevant documents in the Register.

 

1.4       The Permit Holder shall give a copy of this Permit to the person(s) in charge of the site(s) and ensure that such person(s) fully understands all conditions and all requirements incorporated by the Permit. The site(s) refers to site(s) of construction of the Project and shall mean the same hereafter.

 

1.5       The Permit Holder shall display conspicuously a copy of this Permit on the construction site(s) at a convenient location for public’s information at all times.  The Permit Holder shall ensure that the most updated information about the Permit, including any amended permit, is displayed at such location.  If the Permit Holder surrenders a part or the whole of the Permit, the notice he sends to the Director shall also be displayed at the same location as the original Permit.  The suspended, varied or cancelled Permit shall be removed from display at the construction site(s).

 

1.6       The Permit Holder shall construct the Project in accordance with the project descriptions in Part B of this Permit.

 

1.7       The Permit Holder shall ensure that the Project is designed, constructed and operated in accordance with the information and all recommendations described in the EIA Report (Register No. AEIAR-110/2007); the application documents including all attachments (Application No. AEP-303/2008); other relevant documents in the Register; and the information or mitigation measures described in this Permit, mitigation measures to be recommended in submissions that shall be deposited with or approved by the Director as a result of permit conditions contained in this Permit, and mitigation measures to be recommended under ongoing surveillance and monitoring activities during all stages of the Project. Where recommendations referred to in the documents of the Register are not expressly referred to in this Permit, such recommendations are nevertheless to be implemented unless expressly excluded or impliedly amended in this Permit.

 

1.8       All deposited submissions, as required under this Permit, shall be rectified in accordance with the comments, if any made by the Director within one month of the receipt of the Director’s comments or otherwise specified by the Director.

 

1.9       All submissions approved by the Director, all submissions deposited without comments by the Director, or all submissions rectified in accordance with comments by the Director under this Permit shall be construed as part of the permit conditions described in Part C of this Permit.  Any variations of the submissions shall be approved by the Director in writing or as prescribed in the relevant permit conditions. Any non-compliance with the submissions may constitute a contravention of the EIA Ordinance (Cap. 499). All submissions or any variation of the submissions shall be certified by the Environmental Team (ET) Leader and verified by the Independent Environmental Checker (IEC) referred to in Conditions 2.1 and 2.2 below, before submitting to the Director under the Permit.

 

1.10     The Permit Holder shall release all finalized submissions, as required under this Permit, to the public by depositing copies in the EIA Ordinance Register Office, or in any other places, or any internet websites as specified by the Director, or by any other means as specified by the Director for public inspection.  For this purpose, the Permit Holder shall provide sufficient copies of the submissions.

 

1.11     All submissions to the Director required under this Permit shall be delivered either in person or by registered mail to the EIA Ordinance Register Office (currently at 27/F, Southorn Centre, 130 Hennessy Road, Wanchai, Hong Kong).  Electronic copies of all finalized submissions required under this Permit shall be prepared in Hyper Text Markup Language (HTML) (version 4.0 or later) and in Portable Document Format (PDF version 4.0 or later), unless otherwise agreed by the Director and shall be submitted at the same time as the hard copies.

 

1.12     The Permit Holder shall notify the Director in writing the commencement date of construction of the Project no later than one month prior to the commencement of construction of the Project. The Permit Holder shall notify the Director in writing immediately if there is any change of the commencement date of the construction.

 

1.13     For the purpose of this Permit, “commencement of construction” does not include works related to site clearance and preparation, or other works as agreed by the Director.

 

 

2.         Submissions or Measures before Commencement of Construction of the Project

 

        Employment of Environmental and Audit (EM&A) Personnel

 

2.1       An Environmental Team (ET) shall be established by the Permit Holder no later than one month before the commencement of construction of the Project. The ET shall not be in any way an associated body of the Contractor or the Independent Environmental Checker (IEC) for the Project. The ET shall be headed by an ET Leader. The ET Leader shall be a person who has at least 7 years of experience in environmental monitoring and auditing (EM&A) or environmental management. The ET and the ET Leader shall be responsible for the implementation of the EM&A programme in accordance with the EM&A requirements as contained in the EM&A Manual and its update as approved under Condition 2.4 of this Permit. The ET Leader shall keep a contemporaneous log-book of each and every instance or circumstance or change of circumstances, which may affect the environmental impact assessment and each and every non-compliance with the recommendations of the approved EIA Report (Register No. AEIAR-110/2007) or this Permit. The ET Leader shall notify the IEC within one working day of the occurrence of any such instance or circumstance or change of circumstances. The ET Leader’s log-book shall be kept readily available for inspection by all persons assisting in supervision of the implementation of the recommendations of the approved EIA Report (Register No. AEIAR-110/2007) and this Permit or by the Director or his authorized officers. Failure to maintain records in the log-book, failure to discharge the duties of the ET Leader as defined in the EM&A Manual or failure to comply with this Condition would entitle the Director to require the Permit Holder by notice in writing to replace the ET Leader. Failure by the Permit Holder to make replacement, or further failure to keep contemporaneous records in the log-book despite the employment of a new ET Leader may render the Permit liable to suspension, cancellation or variation.

 

2.2       An IEC shall be employed by the Permit Holder no later than one month before commencement of construction of the Project. The IEC shall not be in any way an associated body of the Contractor or the ET for the Project. The IEC shall be a person who has at least 7 years of experience in EM&A or environmental management. The IEC shall be responsible for duties defined in the EM&A Manual and its update as approved under Condition 2.4 of this Permit, and shall audit the overall EM&A performance, including the implementation of all environmental mitigation measures, submissions required in the EM&A Manual, and any other submissions required under this Permit. In addition, the IEC shall be responsible for verifying the environmental acceptability of permanent and temporary works, relevant design plans and submissions under this Permit. The IEC shall verify the log-book(s) mentioned in Condition 2.1 of this Permit. The IEC shall notify the Director by fax, within one working day of receipt of notification from the ET Leader of each and every occurrence, change of circumstances or non-compliance with the approved EIA Report (Register No. AEIAR-110/2007) and this Permit, which might affect the monitoring or control of adverse environmental impacts from the Project. In the case where the IEC fails to so notify the Director of the same, fails to discharge the duties of the IEC as defined in the EM&A Manual or fails to comply with this Condition, the Director may require the Permit Holder by notice in writing to replace the IEC. Failure to replace the IEC as directed or further failure to so notify the Director despite employment of a new IEC may render the Permit liable to suspension, cancellation or variation. Notification by the Permit Holder is the same as notification by the IEC for the purpose of this Condition.  

 

            Review of Environmental Monitoring and Audit (EM&A) Programme

 

2.3       The Permit Holder shall review the EM&A programme to include monitoring of hydrological characteristics of the Shuen Wan marsh during the construction and operation phases to ensure that the conservation area will not be dried up and the inter-tidal characteristics of the conservation area be maintained during normal situation; and to include monitoring of water quality of Wai Ha River during the construction phase.  At least three months before the commencement of construction of the Project, the Permit Holder shall submit the review results of the EM&A programme to the Director for approval.

 

            Submission of updated Environmental Monitoring and Audit (EM&A) Manual

 

2.4       The Permit Holder shall, no later than one month before the commencement of construction of the Project, submit to the Director for approval five hard copies and one electronic copy of an updated EM&A Manual for the Project.  The updated EM&A Manual shall provide details of the EM&A programme on the water quality and hydrological monitoring based on the review results approved under Condition 2.3 of this Permit and the Event/Action Plan detailing the actions to be carried out in case of deteriorating hydrological characteristics or water quality. Before submission to the Director, the updated EM&A Manual shall be certified by the ET Leader and verified by the IEC as conforming to the information and recommendations contained in the EIA Report (Register No. AEIAR-110/2007). 

 

Submission of the Habitat Compensatory Plan (HCP) for Ecological Compensation Area

 

2.5       The Permit Holder shall, no later than three months before the commencement of construction of the Project, submit to the Director for approval four hardcopies and one electronic copy of the Habitat Compensatory Plan (HCP) for the ecological compensation area.  The HCP shall be prepared in accordance with the conceptual plan contained in Figure 7.2 of the EIA Report (Register No. AEIAR-110/2007).  The HCP shall show the detailed design, implementation programme, and subsequent maintenance and management schedules of the ecological compensation area.  Before submission to the Director, the HCP shall be certified by the ET Leader and verified by the IEC as conforming to the information and recommendations contained in the EIA Report (Register No. AEIAR-110/2007). 

 

Submission of Transplantation Proposal for Plant Species of Conservation Interest

 

2.6       To mitigate the ecological impact due to the loss of plant species of conservation interest, Pavetta hongkongensis, the affected plants within the project area shall be transplanted before the commencement of construction.  The Permit Holder shall, no later than three months before commencement of transplanting works, deposit with the Director three hard copies and one electronic copy of transplantation proposal.  Before submission to the Director, the proposal shall be certified by the ET Leader and verified by the IEC as conforming to the information and recommendations contained in the approved EIA report (Register No. AEIAR-110/2007).  The detailed transplantation proposal shall include the following information:

 

(a)          qualification of the specialist(s) to carry out the transplantation works;

(b)         number, locations and photographs of plants to be transplanted;

(c)          locations of the receptor sites for transplantation;

(d)         methodology and implementation programme; and

(e)          detailed schedule for post-transplantation maintenance and monitoring of plants.

 

            Submission of Landscape Plan of the Project

 

2.7       The Permit Holder shall, no later than three months before commencement of construction of the Project, submit four hardcopies and one electronic copy of a landscape plan to the Director for approval.  The landscape plan shall show the locations, size, number and species of planting, design details, implementation programme, maintenance and management schedules, and drawings in the scale of 1:1000 or other appropriate scale showing the landscape and visual mitigation measures of the Project, in particular the landscape and compensatory planting and architectural and chromatic treatment of the floodwater pumping station.  Before submission to the Director, the landscape plan shall be certified by the ET Leader and verified by the IEC as conforming to the information and recommendations contained in the approved EIA report (Register No. AEIAR-110/2007).

3.         Submissions or Measures during Construction of the Project

           

            Management Organization of Main Construction Companies

 

3.1       The Permit Holder shall, within one month after the commencement of construction of the Project, inform the Director in writing the management organization of the main construction companies and/or any form of joint ventures associated with the construction of the Project.  The submitted information shall include at least an organization chart, names of responsible persons and their contact details.

 

Works Areas of the Project

 

3.2       The Project shall be constructed at the locations shown in Figure 1 of this Permit.  No works of the Project shall be carried out outside the “site limit” as shown in Figure 1 of this Permit.

 

Establishment of Ecological Compensation Area

 

3.3       The Permit Holder shall, within twelve months after the commencement of construction of the Project, establish not less than 0.8 hectares of ecological compensation area at the location indicated in Figure 1 attached to this Permit as conforming to the design set out in the HCP approved under Condition 2.5 of this Permit.  The implementation of measures for the establishment of the ecological compensation area shall be certified by the ET Leader and verified by the IEC.

 

            Measures to Mitigate Ecological Impacts

 

3.4       The construction of the box culvert along Tung Tsz Road under the Project shall be carried out in stages, with length for each stage no more than 120m at any time, to avoid and minimize potential ecological impact on the nearby conservation area.  The trench shall be backfilled and compacted with suitable materials upon completion of each stage of the construction works.

 

3.5       During construction of the box culvert along Tung Tze Road, to avoid spill over of muddy water and disturbance to the nearby conservation area, 2m high, gap free sheet-pile hoardings shall be installed along the works area of each stage and 300mm high sand bag shall be provided along the hoardings according to the schematic diagram shown in Figure 2 attached to this Permit.

 

3.6       No construction works for installation of the mechanical gate under the Project shall be carried out during the breeding season (March to June) of the ardeids.

 

      Measures to Mitigate Water Quality Impacts

 

3.7       Excavation works within the Wa Hai River under the Project shall be carried out in the dry season (October to April) only.  The excavation area shall be limited to section of half width of the river channel in order to maintain water flow within the river during construction stage.  Bunds or barriers shall be installed surrounding the excavation area to minimize water quality impacts upon the downstream of the Wai Ha River.

 

3.8       Tightly sealed closed grab excavators shall be employed to minimize leakage and loss of sediments during excavation works within the Wa Ha River.

3.9       To mitigate environmental impacts on the conservation area due to site runoff and other potential water pollution caused by construction activities, all mitigation measures described in Annex A shall be fully implemented throughout the construction period.

 

            Measures to Mitigate Landscape and Visual Impacts

 

3.10     All landscaping and visual mitigation measures shall be implemented for the Project in accordance with the landscape plan approved under Condition 2.7 of this Permit.  At least one month before the Project commences operation, four hard copies and one electronic copy of detailed landscape as-built drawing(s) with an explanatory statement showing the final locations, size, number and species of planting to demonstrate compliance with the approved submissions under Condition 2.7 of this Permit shall be deposited with the Director.  This as-built submission shall be certified by the ET Leader and verified by the IEC to demonstrate that Condition 2.7 is fulfilled.

 

 

4.                  Submissions or Measures during Operation of the Project

 

4.1       The ecological compensation area described in Condition 3.3 above shall be in place and properly maintained during the operation of the Project.

 

4.2       Desilting of the box culvert shall be carried out in the dry season from October to April.

 

 

5.         Environmental Monitoring and Audit (EM&A) Requirements for the Construction and Operation of the Project

 

5.1       The EM&A programme shall be implemented in accordance with the procedures and requirements in the updated EM&A Manual approved under Condition 2.4 of this Permit.  Any changes to the monitoring and audit requirements shall be justified by the ET leader and verified by the IEC as conforming to the requirements set out in the updated EM&A Manual, and shall seek the prior approval from the Director before implementation.

        

5.2       Samples, measurements and necessary remedial actions shall be taken in accordance with the requirements of the updated EM&A Manual by:

(a)          conducting baseline environmental monitoring;

(b)         conducting impact monitoring;

(c)          carrying out remedial actions described in the Event/Action Plans of the updated EM&A Manual in accordance with the time frame set out in the Event/Action Plans, or as agreed by the Director, in case where specified criteria in the updated EM&A Manual are exceeded;

(d)         logging and keeping records of the details of (a) to (c) above for all parameters within 3 working days of the collection of data or completion of remedial action(s), for the purpose of preparing and submitting the monthly EM&A Reports and to make available the information for inspection on site.

 

 5.3      Three hard copies and one electronic copy of the Baseline Monitoring Report shall be submitted to the Director at least 2 weeks before the commencement of construction of the Project.  The submission shall be certified by the ET Leader and verified by the IEC.  Additional copies of the submission shall be made available to the Director upon his request.

 

5.4       Three hard copies and one electronic copy of monthly EM&A Report shall be submitted to the Director within 2 weeks after the end of the reporting month.  The EM&A Reports shall include a summary of all non-compliance (exceedances) of the environmental quality performance limits (Action and Limit Levels).  The submissions shall be certified by the ET Leader and verified by the IEC.  Additional copies of the submission shall be provided to the Director upon request by the Director.

 

5.5       All EM&A data submitted under this Permit shall be true, valid and correct.

 

6.         Electronic Reporting of EM&A Information

 

6.1       To facilitate public inspection of the Baseline Monitoring Report and monthly EM&A Reports via the EIAO Internet Website and at the EIAO Register Office, electronic copies of these Reports shall be prepared in Hyper Text Markup Language (HTML) (version 4.0 or later) and in Portable Document Format (PDF version 4.0 or later), unless otherwise agreed by the Director and shall be submitted at the same time as the hard copies as described in Condition 5 above of this Permit.  For the HTML version, a content page capable of providing hyperlink to each section and sub-section of these Reports shall be included in the beginning of the document. Hyperlinks to all figures, drawings and tables in these Reports shall be provided in the main text from where the respective references are made.  All graphics in these Reports shall be in interlaced GIF format unless otherwise agreed by the Director.  The content of the electronic copies of these Reports must be the same as the hard copies.

 

6.2       The Permit Holder shall, within six weeks after the commencement of construction of the Project, set up a dedicated Internet web site and notify the Director in writing the Internet address where the environmental monitoring data and project information is to be placed.  All environmental monitoring data described in Condition 6.1 above shall be made available to the public via the abovementioned dedicated Internet web site in the shortest possible time and in any event no later than 2 weeks after the relevant environmental monitoring data are collected or become available, unless otherwise agreed with the Director. 

 

6.3       The Internet web site as described in Condition 6.2 above shall enable user-friendly public access to the environmental monitoring data and project information including the Project Profile and this Environmental Permit.  The Internet web site shall have features capable of:

 

(a)    providing access to all environmental monitoring data of this Project collected since the commencement of construction;

(b)   providing access to all finalized submissions as required under this Permit;

(c)    searching by date;

(d)   searching by types of monitoring data (water quality, ecology, noise and air quality); and

(e)    hyperlinking to relevant monitoring data after searching;

 

         or otherwise as agreed by the Director.


Notes :

 

1.   This Permit consists of three parts, namely, PART A (Main Permit), PART B (Descriptions of Designated Project) and PART C (Permit Conditions).  Any person relying on this Permit should obtain independent legal advice on the legal implications under the EIAO, and the following notes are for general information only.

 

2.   If there is a breach of any condition of this Permit, the Director or his authorized officer may, with the consent of the Secretary for the Environment, order the cessation of associated work until the remedial action is taken in respect of the resultant environmental damage, and in that case the Permit Holder shall not carry out any associated works without the permission of the Director or his authorized officer.

 

3.   The Permit Holder may apply under Section 13 of the EIAO to the Director for a variation of the conditions of this Permit. The Permit Holder shall replace the original permit displayed on the Project site by the amended permit.

 

4.   A person who assumes responsibility for the whole or a part of the Project may, before he assumes responsibility of the Project, apply under Section 12 of the EIAO to the Director for a further environmental permit.

 

5.   Under Section 14 of the EIAO, the Director may with the consent of the Secretary for the Environment, suspend, vary or cancel this Permit. The suspended, varied or cancelled Permit shall be removed from display at the site.

 

6.   If this Permit is cancelled or surrendered during operation of the Project, another environmental permit must be obtained under the EIAO before the Project could be continued. It is an offence under Section 26(1) of the EIAO to operate a designated project listed in Part I of Schedule 2 of the EIAO without a valid environmental permit.

 

7.      Any person who operates the Project contrary to the conditions in the Permit, and is convicted of an offence under the EIAO, is liable: -

 

(i)     on a first conviction on indictment to a fine of $2 million and to imprisonment for 6 months;

(ii)    on a second or subsequent conviction on indictment to a fine of $5 million and to imprisonment for 2 years;

(iii)   on a first summary conviction to a fine at level 6 and to imprisonment for 6 months;

(iv)   on a second or subsequent summary conviction to a fine of $1 million and to imprisonment for 1 year; and

(v)    in any case where the offence is of a continuing nature, the court or magistrate may impose a fine of $10,000 for each day on which he is satisfied the offence continued.

 

8.   The Permit Holder may appeal against any condition of this Permit under Section 17 of the EIAO within 30 days of receipt of this Permit.

 

9.      The Notes are for general reference only and that the Permit Holder should refer to the EIAO for details and seek independent legal advice.

 

Environmental Permit No. EP-303/2008

環境許可證編號EP-303/2008


Annex A (as referred to in Condition 3.9)

Measures to Mitigate Environmental Impacts due to Site Run-off During Construction

(i)                  Surface run-off from the construction site shall be directed into adequately designed sand/silt removal facilities such as sand traps, silt traps and sediment basins before discharge into storm drains. Channels, earth bunds or sand bag barriers shall be provided on site to properly direct stormwater to such silt removal facilities.

 

(ii)                Catchpits and perimeter channels shall be constructed in advance of site formation works and earthworks.

 

(iii)               Silt removal facilities, channels and manholes shall be suitably maintained with the deposited silt and grit being removed at least once a week, and at the onset of and after each rainstorm to ensure that these facilities are functioning properly at all times.

 

(iv)              Earthworks final surfaces shall be well compacted and the subsequent permanent work or surface protection shall be carried out immediately after the final surfaces are formed to prevent erosion caused by rainstorms. Appropriate intercepting channels shall be provided along the site boundary.  Rainwater pumped out from trenches or foundation excavations shall be discharged into silt removal facilities before discharge into storm drains.

 

(v)                No stockpiling of excavated materials shall be allowed on conservation area.  Open stockpiles of construction materials (e.g. aggregates and sand) on site shall be covered with tarpaulin or similar fabric during rainstorms. Measures such as providing sand bag barriers shall be taken to prevent the washing away of construction materials, soil, silt or debris into any drainage system.

 

(vi)              All generators, fuel and oil storage shall be within bunded areas. Drainage from the areas shall be connected to storm drains via a petrol interceptor.

 

| Figure 1 | Figure 2


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