Environment Mitigation Measures in DMRC
Transcript of Environment Mitigation Measures in DMRC
Overview Some Basics on Dust
Environmental Management during Construction
DMRC’s Mission & Culture
Formulation of Environmental policy
Implementation through contract mechanisms
Various dust control measures adopted
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What Constitutes Dust?
Construction Dust is a general term used to what may befound on a construction site. There are three main types:
Silica / Soil dust – Silica is a natural mineral present inlarge amounts in things like sand, sandstone andgranite
Non-silica dust- The most common ones includegypsum, cement, limestone, marble and dolomite.
Wood dust – Wood is widely used in construction (butnot in DMRC).
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Why is dust a problem?
Creates health problems, particularly for those withrespiratory problems
Causes environmental degradation, including air andwater pollution
Creates problems with visibility
Damage or make property and belongings dirty
Creates unsafe working conditions
Increases costs associated with the loss of materials oradditional work involved
How is it caused?
In DMRC, the most common ways when dust is generatedinclude:
Site preparation activities
Demolition activities
Construction activities/ Excavation
Vehicle movement
Uncovered stockpiles
In addition to dust, unmitigated emission from DG setsand construction vehicles also cause air pollution
Environmental Management during Construction
Policy Framework
DMRC being an environmentally consciousorganization, concern for environment is manifested inMission and Culture statement, which inter-alia state:-
Mission:
• To make Delhi Metro self-sustainable
Culture
• During construction we should neitherinconvenience nor endanger public life nor shouldour work lead to ecological or environmentaldegradation………
Environmental Management during Construction
DMRC has developed Environmental Policy followed by action plan
to ensure proper implementation of its mission and culture.
Contract Mechanism DMRC has Conditions of Contract on Environment Management and
Environment Management Manual which lay down the guidance for
environmental protection measures to be adopted as part of mitigation
strategy for overcoming adverse environmental impacts during construction.
Contract Mechanism
6 Layers of Vigil
Inspection by trained Site Engineer
Inspection by DMRC Environment Department
External Audit
ISO 14001 (EMS) Certification by Contractors
ISO 14001 (EMS) Certification by DMRC
Public Complaints & Perceptions
Response to Public Grievance Redressal Procedure-
DMRC has a separate department “Public Complaint Cell” for redressing public
complaint at the earliest.
Complaint registration
24 hrs helpline number
Online (www.delhimetrorail.com)
Metro Bhawan or any DMRC office
Contractors’ office
Complaint is forwarded to concerned person who takes necessary actions.
After taking necessary actions the same is communicated to Public Complaint Cell.
Public Complaint Officer informs the person on action taken.
Carrot & Stick Policy
Penalty & Awards
DMRC has provision for imposing penalty in case of
non-compliance to the Conditions of Contract on
SHE and Project Env. Manual.
DMRC also encourages contractors to maintain a
good site w.r.t. Environment by giving awards.
Dust Control Measures in DMRC
BarricadingDMRC introduced the use of barricades during construction inIndia. All construction sites including Batching Plant and CastingYard are properly barricaded.
Specifications of Barricades
Height- 2m
Length- 2.55m
Material- Plain MS sheet
Benefits-
• Restrict dust emission
• Crowd control and safety
• Prevent unnecessary unauthorized, or inadvertent access by people, vehicles, and equipment.
Dust Control Measures in DMRC
Toe Dust Cleaning
Toe dust accumulated onbarricade boards arecleaned on daily basis tominimize road side dustpollution.
This helps in keeping theroad clean.
Dust Control Measures in DMRC
Water Sprinkling-The practice of water sprinkling hasbeen carried out regularly at allconstruction sites.Generally RO reject water is used forthis purpose.The frequency depends on site andclimatic condition.DMRC has started using treatedsewage for sprinkling.Dust suppression chemicals are alsoavailable in the market. However it hasbeen found not feasible for DMRCconstruction works.
Water Sprinkling.wmv
Dust Control Measures in DMRC
Wheel Washing FacilityDMRC introduced use of wheelwashing facility at exit ofconstruction sites.At such facility, high pressurewater jet is directed at wheelsof vehicles to remove all spoiland dirt so as to avoid anydeposition of material on publicroad.Where installation of suchfacility is not possible, manualcleaning of wheels is done withthe help of wire brush.Wheel Washing at BKP(Night).wmvWheel Washing at Kalkaji(Day).wmv
Dust Control Measures in DMRC
Hard Surface in Batching Plant and Casting Yard-Areas within the Sitewhere there is aregular movement ofvehicles, hard surfaceis provided that is keptclear of loose surfacematerial so that dustemission due tovehicular movementcan be reduced.
Dust Control Measures in DMRC
Grass paving and tree plantation-
Grass paving and tree plantationare quick and effective means ofdust control for disturbed area.
Grass covers and protectsexposed loose soil, so evenwhen winds kick up the soilstays put.
In areas not expected to handlevehicle traffic, grass paving andtree plantation have been donewhich provide coverage tosurface soils and slows windvelocity at the ground surface
Dust Control Measures in DMRC
Dust Collector at Batching Plant-
Dust collector is used at every batching plant to reducefugitive cement dust generation and air pollution.
Dust Control Measures in DMRC
Covered Conveyer Belt-
Conveyer belts are a source from where particulatematter escapes during concrete production. To controlthe flying dust, conveyor belts are covered with sheets.
Dust Control Measures in DMRC
Provision of exhaust fanwith duct facility in Cementgo-downTo restrict flying of dustthrough exhaust fan, a ductis connected to a bucket ofwater.This ensures dust get mixedin water preventingemission.This water mixed withcement dust is recycled atsedimentation tank.Exhaust fan.wmv
Dust Control Measures in DMRC
Separate storage area for course & fine aggregate-
Separate storage area with three side covering isprovided for course and fine aggregate to minimizedust expansion.
Dust Control Measures in DMRC
Water Sprinkling on aggregate-
At batching plants, water is sprinkled on aggregate so asto avoid the generation of dust and particulate matter.
Dust Control Measures in DMRC
Covering of Muck-
The muck/soilgenerated fromexcavation is disposedoff at designated areawithin 48 hours.
While stored at site itis properly coveredwith tarpaulin sheetsto prevent flying ofdust.
Dust Control Measures in DMRC
Covering of material duringtransportation-DMRC is taking special care whiletransporting much/soil fromconstruction site to dumping areas.The material is completely coveredwith sheets to prevent dust beingairborne while transporting.Soil is disposed at designated area.All precaution are taken at dumpingsite to minimize air pollution.A checklist system has beenimplemented at exit gates of allcontracts to ensure truck does notexit the gate without wheel washingand covering.
Dust Control Measures in DMRC
Disposal of C&D Waste-All C&D waste
generated at site areeither recycled at IL&FSBurari or reused forbackfilling andtemporary constructionworks.
So far 1.8 lakh tons ofC&D waste has beenrecycled at this facilityby DMRC.
DMRC is in process ofestablishing its ownrecycling facility atRohini.
Dust Control Measures in DMRC
Speed Restriction-
Motorized vehicles at site are restricted to a maximumspeed of 10-15 kilometers/hr.
This results in improved safety and less dust emission.
Dust Control Measures in DMRC
Use of Green Net-
Green nets are provided to restrict the escape ofdust from any particular work/activity which mayhave capacity to generate dust.
Dust Control Measures in DMRC Air Quality Monitoring-
Air monitoring is carried outin three stages:
• Prior to start of construction forbaseline values
• During construction to monitorthe impact
• During operation stage to map theimpact of Metro in reducing airpollution.
Regular air quality monitoringat all construction sites.
Parameter and frequency aretabulated below:
Parameter Frequency Remarks
PM10 Fortnightly At elevated sites
PM2.5 Fortnightly At underground sites
Dust Control Measures in DMRC
Ventilation And Dust ControlInside The Tunnel DG/CIIBC approved
ventilation system is provided Fresh air supply shall not be
less than 6m3/min Oxygen level shall not be less
than 19.5% in the workingenvironment
CO, CO2, H2S and O2 levelmonitoring at every 4 hrs.
Major tunnel cleaning activitytakes place immediately afterTBM break through. This isdone by using water.
Thereafter frequently tunnelcleaning is done with thehelp of water.
Emission Control Measures in DMRC DG set monitoring-
All DG sets used at DMRC construction sites (above 800 kVA) areregularly checked for pollution.
Emission Control Measures in DMRC
PUC Certificate-
Only Pollution UnderControl (PUC) certifiedvehicles are allowedinside DMRC premises.
Regular checking isalso carried out toensure the validationof the certificate.
Way Forward
Construction related standards with trigger values;
Financial incentives for implementing Environment Management best practices during construction
Capacity building
International Practices
Wheel washing and dust control - Int Wheel Washing and Dust Control.mp4
Dust Control - Int Construction Dust Control.mp4
Int Silica Control in Construction.wmv