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:
4.3.2 Quality of Surface Water
Page No.53
Surface Water Quality in the study area (Secondary data)
In the study area, there are two major drains joining river Yamuna falls, namely,
Supplementary (Burari drain) and Najafgarh drain. The water quality of these drains
before joining river Yamuna is given below in table 4.1.
Table 4.1: Surface Water Quality of Major Surface Drains in the Study Area
S.
No
Name of drain PH TSS, mg/l COD,
mg/l
BOD 5 ,
mg/l
1. Supplementary (Burari 7.1 - 7.79 72 - 142 54 - 91 23 - 27
drain)
2. Najafgarh 6.95 - 7.62 132 - 221 117 - 228 56 - 58
3. Effluent standards for 5.5 -9.0 100 250 30
discharge to surface
water body *
* Both these drains carry industrial as well as domestic wastewater (drained
from various parts of NCT - Delhi). Therefore they are compared with the effluent
standards.
Source: Report on "Status of Ground Water Quality and Pollution Aspects in NCT- Delhi", by
CGWB, Chandigarh and CPCB, Delhi, January 2000.
From table 4.1, it is observed that TSS and BOD 5 values of Najafgarh drain exceed
the discharge standards (to inland surface water). The high COD and BOD 5 value
indicates organic pollution and low oxygen content in Najafgarh drain.
Surface Water Quality Monitoring (Primary data)
To assess the present surface water quality of all the surface bodies including the
above mentioned drains flowing within the 5 Km radius of the proposed sites, NPC
team has taken grab samples. The samples were analyzed in NPC Laboratory. The
samples drawn from the various water bodies were analysed for relevant parameters
in the NPC laboratory. The locations of surface water sampling points around site I, II
and III have been shown on figure 4.14 through figure 4.16. The analytical results
of the samples are given in the Table-4.2, Table-4.3 & Table-4.4
Environment Division, National Productivity Council, New Delhi
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