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.86
Following inference can be drawn from the results obtained:
(i)
Based on the soil characteristics, the subsoil can be divided into following
different strata:
• Strata I: (From ground level upto a depth of 5.5m). It consists predominantly of
fine grained soils i.e. clayey silt of medium plasticity (CI), sandy silt of low
plasticity (CL) & sandy silt (ML).
• Strata II: (From 5.5m to 11.0 m depth below ground level). It consists
predominantly of coarse grained soils i.e, silty sand (SM/SP-SM).
• Strata III: (From depth 11.0 to 19.4 m below ground level). It consists
predominantly of fine grained soils i.e. clayey silt of low plasticity (CL) & sandy silt
of low plasticity (CL/ML-CL).
• Strata IV: (From depth 19.4 to 20.4 m below ground level). It consists of silt sand.
(ii)
(iii)
The coefficient of permeability ranged from 4.4 x 10 -6 to 6.7 x 10 -7 cm/sec for
low to medium plastic soils comprising of clayey silt of low to medium
plasticity (CI/CL) & sandy silt of low plasticity (CL/ML-CL). However for nonplastic
soils comprising of silty sand (SM/SP-SM) & sandy silt (ML) the
coefficient permeability ranged from 1.6 x 10 -4 to 4.8 x 10 -4 cm/sec. Fig 4.23
depicts the variation of permeability in different strata.
The groundwater was encountered at 4.5 m depth from existing ground level.
Site II: Wazirpur CETP Site: The geotechnical investigation of the site was carried
out from 27.02.2002 to 01.03.2002. The test results are tabulated in table 4.14
below.
Environment Division, National Productivity Council, New Delhi
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