EIA Studies of 3 Pre-Identified Hazardous Waste Disposal Sites in ...

Rapid EIA Studies of 3 Pre-identified Hazardous Waste Disposal Sites in NCT - Delhi
Page No.179
During the construction phase, major source of waste water is sewage generation
from the labour sheds, temporary housing from construction personnel etc.
During the operation phase, apart from the sewage generation, other sources of
waste water are leachate from waste storage area, pre-treatment process and the
landfill facility. The leachate generated is proposed to be treated in the leachate
treatment plant before disposal into any surface water body. Moreover, the liner
system meeting the technical requirements of CPCB at the bottom, side and top is
proposed which will act as a barrier and prevent the contamination of soil beneath
the facility and groundwater.
Therefore, the leachate generated from the facility shall not have adverse impact on
the surface water body or on groundwater source as long as liner system is intact in
SLF.
The nearest drain from the proposed site is Najafgarh drain which is at about 500 m
distance from the site. The drain water quality indicates the presence of inorganic as
well as organic pollution. Therefore, the impact of leachate disposal into the drain
shall not add any pollution load to the drain.
The subsoil permeability is in the range of 4.5 x 10 -4 to 6.3 x 10 -6 cm/sec which is
quite high and the groundwater is available at a depth of 4.5 m bgl. Therefore, risk of
groundwater contamination due to leachate percolation is high although groundwater
quality available is very hard and saline. In order to protect the groundwater
resources, an impermeable double composite liner complying with the standards
suggested by CPCB is recommended to be laid at the base and side of the facility.
Further, leachate collection and treatment system will be installed to collect and treat
the leachate generated at the base of the waste body. The storm water will be
diverted from entering into the waste body by appropriate earth bunds.
During closure/post-closure phase, leachate generation will be minimal and it will not
pose any threat to the water environment. The cover liner, leachate management
system and green belt development at the periphery of the site is proposed to
mitigate these impacts. However, groundwater monitoring will continue even after
the closure of the facility for a period of about 30 years.
Impact on Noise Environment
During the construction phase, construction equipment including dozers, scrapers,
generators, concrete mixers and vehicles will be the major noise sources. However,
the noise generated from the various sources will be intermittent and is expected to
be of short duration.
During the operation phase, movement of vehicles, dozers, generators etc. are
expected to increase the noise levels of the area. However, the proposed greenbelt
will absorb the noise level upto greater extent since the nearest settlement is 1 Km
away, the impact of increased noise level will be minimum.
Not much of impact on noise environment is expected during the closure/post
closure phase.
Environment Division, National Productivity Council, New Delhi
7