Integrated economic development of small towns environmental codes of practice

Chapter 6 Control of air pollution

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Chapter 6 Control of air pollution

(1) This project is in construction and operation stage; therefore, various operation activities will cause emission of air pollutants.

(2) Main air pollutants in this project include:

  • Fugitive dust emissions due to exposure of slopes, uncovered stockpiling area, earth moving and excavation activities;

  • Transportation of materials on construction roads;

  • Gas emissions from concrete batching plants and during pavement of roads, and

  • Exhaust gases from construction machinery and vehicles.

(3) In order to reduce environment damage caused by construction, environment management shall be strengthened and the following measures shall be taken:

  • Spray water as needed on construction site to reduce raise dust during dry seasons;

  • Effective dust control measures should be taken in the incoming and outgoing links of materials for the cement silos and the premixed dry mortar silos used on the construction sites;

  • For the dregs and bare soil reserved on construction sites, measures such as simple greening by means of grass seed sowing, covering dustproof gauze elements or using new sealing technologies should be taken;

  • The soil obtained during pipeline trench excavation should be removed on the same day of excavation;

  • Never have the dregs on the construction sites stacked higher than the relevant enclosures or barricades;

  • Cover or clean vehicles carrying powder substance before leaving construction site;

  • Spray water as needed on powder materials before transportations;

  • After removing all stockpiles, any leftover powder materials shall be spray by water and swiped from the road;

  • The dusty road should be implemented road hardening project or wetted by sprinkle water;

  • Ensure that water removal for dust control purposes does not impact surface water flows or water uses by local communities;

  • Cover powder material storage sites or sprinkle water to suppress dust;

  • Open cement bags in shielded place;

  • Construct in regulated time to reduce air pollution. The construction time is 6:00 am to 22:00 pm. Construction works should be stopped during lunch time which is between 12:00 am to 14:00pm;

  • Material loads shall be suitably covered and secured during transportation. Ensure that construction vehicles which are carrying earthworks and soil are not overload and prevent unrestrained;

  • When select the location of stockpiles, wind direction shall be considered. It is necessary to avoid disposing powder materials on the upwind direction of sensitive areas;

  • The piling of construction materials shall be windshield and dust controlled;

  • Make sure reasonable transportation route of solid waste to reduce emission of raise dust;

  • Spray water as needed on construction site for demolition works;

  • Temporary fence should be built at the boundary of construction sites during construction works, and

  • Access roads are speed restrictive, and have speed restriction mark. Construction vehicles must observe speed restriction regulations.

Chapter 7 Water pollution control

(1) Waste water generated from construction work will cause negative influence on water ecological system and water quality.

(2) The following activities will cause impacts on water quality during construction and operation stages:

  • Wastewater generated from construction equipment;

  • Wastewater from boring and drilling locations;

  • Soil erosion from uncovered stockpiling locations and uncovered excavation sites during adverse weather conditions;

  • Uncontrolled surface water run-off carrying sediments directly into water bodies such as streams, fish ponds and rivers, and

  • Domestic sewage from camp sites.

  1. In order to reduce environment damage caused by construction, environment management shall be strengthened and the following measures shall be taken:

  • For construction site with fences, the inside of entrance and exit and along the entrance should be set with a horizontal long drainage channel. Drainage tank is connected with drainage system in construction site;

  • Vehicle washing drain tank is designed according to the specific dimension of vehicles. Their surfaces should be leveled and burnished with commercial ready-mixed mortar; and their notches should be covered with metal plates with great supporting capacity;

  • Sedimentation tank in construction site should have sufficient capacity. Also, sedimentation tank should be cleaned regularly, and be disposed by solid waste treatment method;

  • Domestic wastewater should be entered into natural drains or municipal pipe network after tertiary waste treatment;

  • Construction works should be involved in regulated working hour to reduce waste water pollution;

  • Wastewater discharged into surface water body and sewer pipe shall comply with the Chinese legislation for environmental protection;

  • Construction units should assign specific persons to remove the deposits in pipe troughs, inspection wells and sedimentation basins. The removal should be done on a ten-day basis for each key area or a monthly basis for each ordinary area;

  • Maintain waste water dispose system of the construction site regularly (such as settlement tank);

  • Draining mud or muddy water into urban pipe networks directly is strictly prohibited;

  • Clean vehicles and equipment before withdraw from construction site;

  • Keep public road/site, entrance and temporary wall around construction site clean;

  • Provide sufficient space for storing wastewater disposing system, and

  • Make sure the location of waste water dispose site.

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