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:
4.6 GEOTECHNICAL INVESTIGATION
Page No.82
Geotechnical properties of the proposed sites were assessed as per the criteria laid
down by CPCB ( refer Chapter III, section ). Following procedure was adopted for
geotechnical investigation of the sites:
• A bore hole of 100 – 150 mm diameter below existing ground surface through
normal soil i.e sandy, clayey strata ( excluding hard/boudary/rock) using shell
and auger method was drilled at the proposed sites up to 20 m depth below
existing ground surface. Photoplate 11, 12, 13 & 14 shows drilling arrangement
at Wazirpur and Guman Hera site.
• Undisturbed soil samples were collected at 1.5 m interval in depth or change of
strata whichever occurred earlier using straight open end sampling tubes fitted to
an adapter with ball and socket arrangement and using a standard SPT set up.
• Similarly disturbed soil samples were collected at regular interval in depth.
• The depth of groundwater table in the bore hole whenever encountered, was
recorded.
• The soil samples collected were analysed for following:
- Soil type and stratification
- Permeability test for each strata
Site I: Bawana relocation Industry Site: The geotechnical investigation of the site
was carried out from 23.02.2002 to 25.02.2002. The test results are tabulated in
table 4.13 below.
Environment Division, National Productivity Council, New Delhi
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