Table 11.3 Implementation Schedule for Water Quality Control

EIA Ref^#	Environmental Protection Measures / Mitigation Measures	Location / Timing	Implementation Agent	Implementation Stages*				Relevant Legislation and Guidelines
				Des	C	O	Dec
S5.7.2	Construction Site Runoff and Drainage · Before commencing any site formation work, all sewer and drainage connections shall be sealed to prevent debris, soil, sand etc. from entering public sewers/drains. · Temporary ditches shall be provided to facilitate run-off discharge into appropriate watercourses, via a silt retention pond. No site run-off shall enter the freshwater marshes at Luk Tei Tong. · Sand/silt removal facilities such as sand traps, silt traps and sediment basins shall be provided to remove sand/silt particles from runoff to meet the requirements of the Technical Memorandum standard under the Water Pollution Control Ordinance. The design of silt removal facilities shall be based on the guidelines provided in ProPECC PN 1/94. All drainage facilities and erosion and sediment control structures shall be inspected monthly and maintained to ensure proper and efficient operation at all times and particularly during rainstorms. · Water pumped out from foundation excavations shall be discharged into silt removal facilities. · During rainstorms, exposed slope surfaces shall be covered by a tarpaulin or other means. Other measures that need to be implemented before, during, and after rainstorms are summarized in ProPECC PN 1/94. · Exposed soil areas shall be minimized to reduce potential for increased siltation and contamination of runoff. · Exposed soil surfaces shall be protected by paving or fill material as soon as possible to reduce the potential of soil erosion. · Open stockpiles of construction materials or construction wastes on-site of more than 50 m^3 shall be covered with tarpaulin or similar fabric during rainstorms.	Work site / During the construction period	Contractor		Ö			ProPECC PN 1/94; WPCO
S5.7.3 – S5.7.4	General Construction Activities · Debris and refuse generated on-site shall be collected, handled and disposed of properly to avoid entering the river channels, the Luk Tei Tong freshwater marshes and local storm water drains. Stockpiles of cement and other construction materials shall be kept covered when not being used. · Oils and fuels shall only be used and stored in designated areas which have pollution prevention facilities. All fuel tanks and storage areas shall be provided with locks and be sited on sealed areas, within bunds of a capacity equal to 110% of the storage capacity of the largest tank. The bund shall be drained of rainwater after a rain event.	Work site / During the construction period	Contractor		Ö			ProPECC PN 1/94; WPCO
S5.7.5	Sewage from Construction Workforce Temporary sanitary facilities, such as portable chemical toilets, shall be employed on-site. A licensed contractor shall be responsible for appropriate disposal and maintenance of these facilities.	Work site / During the construction period	Contractor		Ö			WPCO
S5.7.6	River Channel Excavation Works Excavation and widening works for the drainage improvements to the Pak Ngan Heung River, Tai Tei Tong River and Luk Ti Tong River shall be carried out in sections (approximately 300 – 400 m in length) and in dry condition. Containment measures such as bunds and barriers shall be used within the river channel and the excavation works restricted to within an enclosed dry section of the channel. The excavation and widening works shall be carried out in the dry season as far as practicable.	Work site / During the construction period	Contractor		Ö
S5.7.7	Maintenance Desilting of River Channels For maintenance desilting of the re-profiled river channels of Pak Ngan Heung River, Tai Tei Tong River and Luk Ti Tong River, temporary barrier walls shall be used to provide a dry work zone for desilting work. Maintenance desilting shall be carried out during periods of low flow in the dry season.	Work site / During the operation period	Contractor			Ö
S.5.9.1	During construction phases, monitoring of downstream water quality within the rivers should be undertaken, together with regular site audits.	With the rivers / During the construction period	Contractor		Ö

# All recommendations and requirements resulted during the course of EIA/EA Process, including ACE and / or accepted public comment to the proposed project.

* Des - Design, C - Construction, O – Operation, and Dec - Decommissioning