Water Quality Impact. The Consultants shall follow the criteria and guidelines for evaluating and assessing water pollution as stated in Annexes 6 and 14 of the TM respectively. The Consultants shall include in the water quality impact assessment of the following tasks: collection and review of background information on the existing and planned water systems and their respective catchments and sensitive receivers which might be affected by the Project; characterisation of water quality on the surrounding water systems and respective catchments and sensitive receivers which might be potentially affected by the Project both during construction and operation stages; identification and analysis of the existing and planned future activities and beneficial uses related to the water systems and identification of the water sensitive receivers by referring to those developments and uses indicated on the relevant Outline Zoning Plans, Outline Development Plans and Layout Plans, and consult the Planning Department on any other developments being considered in the planning process; identification of any alteration of sewage bypass, water courses, drainage systems, leachate collection systems, and change of catchment types or areas; review of the specific construction methods and operation of the Project; identification, analysis and quantification of all existing and likely future water pollution sources, including point discharges and non-point sources to surface water runoff. Establishment and provision of an emission inventory on the quantities and characteristics of all these pollution sources; establishment of the water quality objectives, criteria and standards for all sensitive receivers; assessment and evaluation of any potential water quality impacts on the identified water systems and sensitive receivers; and identification and recommendation of mitigation measures to minimise the adverse water quality impact.
Water Quality Impact. The Consultants shall follow the criteria and guidelines for evaluating and assessing water pollution as stated in Annexes 6 and 14 of the TM respectively.
Water Quality Impact. Major impact to Water Sensitive Receivers will be site runoff, which can be minimised with proper implementation of mitigation measures. The protected environmental sensitive areas include water gathering ground from eastern end of the Project, local streams near Kadoorie Experimental Farm, Xxxx Xxx Monastery, Xxxx Xxxx Xxxx, Xxxxxx Xxxxx and Xxx Tin Bypass; nullah near Wang Toi Xxxx Xxxx Mo Xxx, Xxxx Kong Barracks and the channelized Kam Tin River. Disturbance from construction activities to nearby habitats and site runoff during construction phase can be minimised for the sensitive areas, such as nearby waterbodies, natural habitats and wildlife, with proper implementation of mitigation measures. Site re-appraisal is required for the identified potentially contaminated sites as well as other areas within the Project Boundary to address any change in land use that may give rise to potential land contamination issues as soon as the sites become accessible. A supplementary CAP should be submitted and endorsed by EPD before site investigation and a CAR should be prepared for EPD's agreement upon completion of the site investigation. If contamination was identified, RAP shall be also prepared and submitted to EPD for agreement prior to the commencement of the remediation works. Upon completion of the remediation, a Remediation Report (RR) shall be submitted to EPD for agreement.
Water Quality Impact. I. The Consultants shall make reference to the criteria and guidelines for evaluating and assessing water quality impact as stated in Annexes 6 and 14 of the TM.
II. The assessment area for the water quality impact assessment shall include all the Water Control Zones as designated under the Water Pollution Control Ordinance (Cap. 358).
III. The Consultants shall identify and analyse physical, chemical and biological disruptions of the water system(s) arising from the preferred option(s) through desktop research.
IV. The Consultants shall predict, quantify and assess any water quality impacts arising from the preferred option(s) by appropriate mathematical modelling and/or other techniques proposed by the Consultants and approved by the DR. The mathematical modeling requirements are set out in Appendix E to this Study Brief.
V. The Main Study shall address water quality impacts of the preferred option(s). Essentially, the assessment shall address the following:
i) Collect and review background information on affected existing and planned water systems, their respective catchments through desktop research;
ii) Characterize water quality of the water systems based on existing best available information;
iii) Identify and analyse relevant existing and planned future activities and beneficial uses related to the water systems and identify all water sensitive receivers;
iv) Identify pertinent water quality objectives and establish other appropriate water quality criteria or standards for the water system(s) and the sensitive receivers identified in (i), (ii) and (iii) above;
v) Identify any alternation of any water courses, natural streams, ponds, wetlands, change of water holding/flow regimes of water bodies, change of catchment types or areas and water quality changes;
vi) Identify and quantify existing and likely future water pollution sources, including point discharges and non-point sources to water system(s), sensitive receivers and stormwater drainage system(s);
vii) Provide an emission inventory on the quantities and characteristics of those major existing and future pollution sources;
viii) Derive future sewage flows and loads for different scenario years, assess the adequacy of the existing and planned sewerage and sewage treatment facilities for the collection, treatment and disposal of the future and ultimate sewage flows arising from the preferred option(s) and determine the short term, intermediate term and long term requirements of sewerage improv...
Water Quality Impact. Regular review and maintenance of silt curtain systems, drainage systems and desilting facilities in order to make sure they are functioning effectively. Construction of seawall should be completed as early as possible. Regular inspect and review the loading process from barges to avoid splashing of material. Silt, debris and leaves accumulated at public drains, wheel washing bays and perimeter u-channels and desilting facilities should be cleaned up regularly. Silty effluent should be treated/ desilted before discharged. Untreated effluent should be prevented from entering public drain channel. Proper drainage channels/bunds should be provided at the site boundaries to collect/intercept the surface run-off from works areas. Exposed slopes and stockpiles should be covered up properly during rainstorm.
Water Quality Impact. In accordance with the recommendations of the EIA, mitigation measures have been proposed during the construction phase of the Project. Details of the mitigation measures are presented in Appendix E - Implementation Schedule. In accordance with the recommendations of the EIA, water quality EM&A is required during dredging and sandfilling activities. In addition, baseline water quality monitoring will be required prior to the commencement of construction activities. The following Section provides details of the water quality monitoring to be undertaken by the ET to verify the distance of sediment plume dispersion and to identify whether the potential exists for any indirect impacts to occur to ecological sensitive receivers. The water quality monitoring programme will be carried out to ensure that any deteriorating water quality is readily detected and timely action taken to rectify the situation. The status and locations of water quality sensitive receivers and the marine works location may change after issuing this Manual. If required, the ET in consultation with the Contractor(s) will propose updated monitoring locations and seek approval from the ER, the IEC and EPD.
Water Quality Impact. 4.3.1 Wastewater generated from the decommissioning and demolition works will be limited to general cleaning works, water used in dust suppression and workers. The Specialist Contractor should take precautionary measures to minimise the quantity of wastewater generated.
4.3.2 In order to estimate the wastewater volume will be generated, the flow rate of 0.150 (for construction activity) +0.080 (for commercial employee) m3 per day per construction worker in accordance with Table T-2 of EPD’s Guidelines for Estimating Sewage Flows for Sewage Infrastructure Planning was adopted. At this planning stage, eight (8) workers are expected to work for the project each day and the demolition work will be completed in 14 days. A volume of 25.76m3 would be produced from the project.
4.3.3 The floor drain in the incinerator room shall be covered with a temporary seal during the decommissioning and demolition works. The top of the chimney should be sealed with polyethylene sheets at least twenty-four (24) hours before the works commence.
4.3.4 In addition, cloths which have been used for wet wiping will not be re-used therefore the only wastewater generated by this cleaning process will limited to that on the surfaces of the equipment; it is anticipated that this water will evaporate and no contaminated wastewater will be generated.
4.3.5 All wastewater (if any) generated from the Project will be treated in accordance with Technical Memorandum Standards for Effluents Discharged into Drainage and Sewerage Systems, Inland and Coastal Waters issued under the Water Pollution Control Ordinance (WPCO), Practical Note for Professional Persons on Construction Site Drainage (PN1/94) issued by the EPD, and the conditions of the Wastewater Discharge License.
4.3.6 Following the implementation of the above control measures, no unacceptable impact on water quality is anticipated.
Water Quality Impact. 4.4.1.1 Water quality monitoring and audit is considered necessary to ensure that the recommended mitigation measures are implemented properly throughout the construction phase and during maintenance dredging in operation phase. Weekly site audit is recommended to be conducted during construction phase in order to ensure the proposed mitigation measures are implemented in an appropriate manner and are effective. Marine water quality monitoring is recommended during both capital and maintenance dredging works of the Project. Monitoring parameters will include dissolved oxygen (DO), turbidity and suspended solids (SS). Baseline monitoring for marine water quality will be carried out 3 days per week for 4 weeks prior to the commencement of marine works of the Project. Impact monitoring will be undertaken 3 days per week during the capital and maintenance dredging works of the Project.
Water Quality Impact. 11.4.1 Water quality impacts from the land-based decontamination works, associated with leachate and contaminated runoff, can be controlled to acceptable levels by implementing the recommended mitigation measures. All the effluents and runoff generated from the works areas shall be treated and their quality be monitored before discharged. No unacceptable water quality impacts would be expected from the land-based decommissioning activities.
11.4.2 The proposed method for decommissioning of the disused fuel dolphin would not involve any dredging and in view that the works area would be small, any potential marine water quality impact arising from the decommissioning works would be minor and localized and no unacceptable marine water quality impact would be expected.
11.4.3 Site inspections should be undertaken routinely to inspect the works areas in order to ensure the recommended mitigation measures are properly implemented.
Water Quality Impact. The Contractor shall comply with the Water Pollution Control Ordinance (WPCO) and its subsidiary regulations. In addition, the Contractor shall comply with the “Conditions for Working within Water Gathering Grounds” issued by WSD for the proposed landslip preventive works at the Designated Project (refer to Appendix E). The Contractor should ensure that all runoff arising from the work sites are properly treated, e.g. by the use of sedimentation tank or silt trap, and that the discharge standards as stipulated in WPCO are met. Any trade effluent or foul or contaminated or cooling or hot water should not be discharged into any public sewer, stormwater drain, channel, stream course or the sea. If toilet facilities are erected, foul water effluent should be directed to a foul sewer or to a sewage treatment and disposal facility. The Contractor should be responsible for the design, construction, operation and maintenance of all the mitigation measures and practices specified in the Professional Persons Environmental Consultative Committee Practice Note (ProPECC PN) 1/94 “Construction Site Drainage” issued by the Director of Environmental Protection.
