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ASSALAMUALAIKUM

ASSALAMUALAIKUM. SELAMAT SEJAHTERA. GOOD AFTERNOON. JABATAN ALAM SEKITAR MALAYSIA. Q-SHE CONFERENCE & EXHIBITION (QUARRY SAFETY, HEALTH & ENVIRONMENT) FOR QUARRYING BUSINESS ENHANCEMENT ENVIRONMENTAL REQUIREMENTS IN QUARRY INDUSTRY 14 November 2006

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ASSALAMUALAIKUM

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  1. ASSALAMUALAIKUM SELAMAT SEJAHTERA GOOD AFTERNOON JABATAN ALAM SEKITAR MALAYSIA

  2. Q-SHE CONFERENCE & EXHIBITION (QUARRY SAFETY, HEALTH & ENVIRONMENT) FOR QUARRYING BUSINESS ENHANCEMENT ENVIRONMENTAL REQUIREMENTS IN QUARRY INDUSTRY 14 November 2006 Holiday Villa Subang, Subang Jaya, Selangor By: Dr. Ir. SHAMSUDIN AB LATIF Deputy Director General (Development) Department of Environment, Malaysia Department of Environment, Malaysia

  3. COVERAGE Environmental impacts Planning Stage Environmental Management and Mitigation Measures Maintenance, Monitoring and Record Keeping Conclusion Department of Environment, Malaysia

  4. ENVIRONMENTAL IMPACTS OF QUARRIES Department of Environment, Malaysia

  5. Environmental Impacts of Quarries Development stage Operational stage Post-closure stage Department of Environment, Malaysia

  6. PLANNING STAGE Department of Environment, Malaysia

  7. PUBLIC RELATION • Good neighbor policy - Need to win support of neighboring community Department of Environment, Malaysia

  8. Practical ways of promoting good neighborly relationships • Consultation with residents at the EIA stage • Make available copies of non technical summary • Dedicated staff member to handle complaints • Make available environmental monitoring data Department of Environment, Malaysia

  9. SITING CONSIDERATIONS • Sufficient buffer distance of (preferably) at least 1000 meters from residential area Department of Environment, Malaysia

  10. Site selected to minimize: • Visual impact • Dust • Noise • Pollution of water courses Department of Environment, Malaysia

  11. ENVIRONMENTAL IMPACT ASSESSMENT (EIA) • Identify potential impacts • Suggest mitigation measures Department of Environment, Malaysia

  12. WRITTEN PERMISSION/APPROVAL • Air pollution control • Water pollution control • Monitoring requirements Department of Environment, Malaysia

  13. PLANNING CONSIDERATIONS FOR MITIGATING ENVIRONMENTAL IMPACTS • Site preparation • Blasting • Extraction • Topsoil and overburden management • Rehabilitation • Processing • Stockpiling • Traffic Department of Environment, Malaysia

  14. Site Preparation • Activities: - timber clearing - grubbing - top soil and overburden salvage • Main aspects of concern: - Soil erosion and sediment control Department of Environment, Malaysia

  15. Blasting • Blasting generates: - vibration - audible noise - fly rock - dust • Control: - digital blasting using electronic detonators Department of Environment, Malaysia

  16. Extraction • Noise • Visual concerns • Dust • Traffic • Pollution prevention • Erosion, sediment, storm water • Rehabilitation Department of Environment, Malaysia

  17. Topsoil and Overburden Management • Only clear area that will be actively used for extraction, processing and stockpiling in the near future Department of Environment, Malaysia

  18. Rehabilitation • Progressive rehabilitation is recommended: - minimize topsoil and overburden handling - minimize the need for large storm water management area - prevent dust generation Department of Environment, Malaysia

  19. Processing • Aggregate processing may include: Crushers, screens, wash plants, generators, conveyors • Concerns: Noise, dust, visual impact, sediment, water, wash-water fine Department of Environment, Malaysia

  20. Stockpiling • Generates large quantity of stormwater • Stormwater management; dust control • BMPs: Chute; drop height; water sprays; buffers on down wind of stockpiles; stockpiles located away from sensitive areas Department of Environment, Malaysia

  21. Traffic • On-site traffic generates dust and noise • Mitigation measures: - aspects of haul road and industrial traffic - Entrance and exit designs - Weigh scale layout Department of Environment, Malaysia

  22. ENVIRONMENTAL MANAGEMENTAND MITIGATION MEASURES Department of Environment, Malaysia

  23. STORMWATER AND EROSION CONTROL • Concerns: Soil erosion and mud slides Best Management Practices (BMPs) • Stabilization (Prevention) • Structural (Treatment) • Inspections Department of Environment, Malaysia

  24. Stabilization (Prevention) • Bufferzone • Bioengineering • Ditches • Erosion control blanket • Tarp • Vegetation cover • Benching • Hidroseeding • Limit clearing • Tree protection Department of Environment, Malaysia

  25. Structural (Treatment) • Check dam • Ditches • Outlet protection • Retention basin • Settling pond • Silt fence • Swales Department of Environment, Malaysia

  26. Inspections • Post-storm events • Weekly Department of Environment, Malaysia

  27. Reference Document • Manual Saliran Mesra Alam (MASMA) published by Drainage and Irrigation Department (DID) Malaysia Department of Environment, Malaysia

  28. Drilling • Concerns: Noise and dust • Requires: drilling plan • Mitigation measures: - Drilling machine: dust extraction and collection - Drill hammers and engines: Noise suppression - Drilling hours: Restricted Department of Environment, Malaysia

  29. Blasting • Concerns: Vibration, air blast • Standard: Air blast over pressure: 120dB (Lin Peak) Ground vibration: Maximum 3 mm/s peak particle velocity (ppv) • Mitigation measures: - Use hydraulic rock breakers - Do not use surface detonating cord - Use electronic detonators Department of Environment, Malaysia

  30. Noise • Activities: - Drilling - Blasting - Earth moving operations - Crushing - Screening Department of Environment, Malaysia

  31. Standard At Quarry Boundary • Should not exceed 5 – 10 dB(A) above normalday time ambient level • Day time: 65 dB(A) • Night time: 55 dB(A) Department of Environment, Malaysia

  32. Processing • Enclosures around crushing and screening plants • Solid barriers (bund walls and topographical features) • Vegetation belt • Maintain access and haul road to reduce truck noise • Maintain & lubricate machineries to reduce machinery noise • Use silencers on compressors, rotary engines and generators Department of Environment, Malaysia

  33. Dust control • Typically, low concentration of dust in respirable range (less then 3 microns) • Sources - from processes - from fugitive sources Department of Environment, Malaysia

  34. Dust Generating Points • Drilling • Blasting • Loading of trucks • Truck travel • Fugitive dust loss from trucks • Dumping onto primary crusher • Primary, secondary, tertiary crushing • Screening • Transfer points on conveyor systems • Loading onto storage piles from conveyors • Windblown dust from stockpiles and open conveyors Department of Environment, Malaysia

  35. Mitigation Measures • Some already discussed earlier • Common approach: - Wet suppression system - Dry collection system Department of Environment, Malaysia

  36. Agglomerative Wet Suppression System - Use atomizing nozzles - Water spray pressures Exceeding 14 atm (200 psi) Department of Environment, Malaysia

  37. Wet Suppression System • Applicable for both process and fugitive dust emission • Efficiency: Greater than 70% • Need to enclose dust generation sources Department of Environment, Malaysia

  38. Examples of Enclosure Types/Forms Transfer Points • A head box with inlet strip curtain • A seal on underside of feeder belt • Tight chute with a rock box • Tight skirt board for the entire length of the belt cover • Strip curtain fitted at the front and back discharges of the cover Department of Environment, Malaysia

  39. Enclosure Types/Forms…(cont.) Screens • Preferably, totally enclosed • If open, the feeder belt must be enclosed with a head box extending out over the deck and distribution plate • A seal with rubber between deck and hopper Department of Environment, Malaysia

  40. Enclosure Types/Forms…(cont.) Crushers • Rock box or vault under crusher, with substantial volume • If no vault, the receiving belt must be skirted • Crusher month to be protected from wind by wind screen Department of Environment, Malaysia

  41. Enclosure Types/Forms…(cont.) Dump pockets and hoppers • Custom design enclosure • Hopper top - use of solid sheet material/ tarp fabric/wind fence material • Baffles or turning vans Department of Environment, Malaysia

  42. DRY COLLECTION SYSTEM • Advantage: - More efficient • Disadvantage: - Capital intensive - Power consumptive - High maintenance - Applicable only to sources which can be enclosed Department of Environment, Malaysia

  43. Dry collection system consist of: - Extraction system (hoods, ducting, fans) - Bag house (filters; filtration velocity) Department of Environment, Malaysia

  44. Drilling for blast charge: • Use wet suppression system or • Hooding plus cyclone Department of Environment, Malaysia

  45. Crushing operation(primary, secondary, tertiary) Primary Crushers • All crushers must be enclosed • Wet suppression system (spray above and below crushers) • Crushers can be inter-linked with water flow detectors Department of Environment, Malaysia

  46. Secondary Crushers • Sources: - transfer into crusher - crusher itself • Dust control: - enclosure - vent though bag house Department of Environment, Malaysia

  47. Screening and Material Transfer • Sources: - Screens - Transfer points - Load outs (from hoppers and conveyors) • Dust control: - enclosure - vent though bag house Department of Environment, Malaysia

  48. Conveying • Control: - Spraying with water or conditioning agents at or below discharge points from the conveyer Department of Environment, Malaysia

  49. Stockpiling • Control: - Storage bays - Covers - Water spraying (plus suppressants) - Reduce fall height - Use stone ladder - Limit height of stockpile - No open storage of material under 3 mm - Stockpile at sheltered points - Areas used by vehicles to be consolidated or kept wet Department of Environment, Malaysia

  50. Truck Out Areas (From quarry site to public roadways) Control: • Paving (minimum 30 m) • Use wash station Department of Environment, Malaysia

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