ASSESSMENT OF GROUND WATER QUALITY AROUND OIL- RISTALLATIONS AT RUDRASAGAR, SSAM, INDIAANIL KR. BARUAH, RATHIN N. SHARMA AND PARASH K. CHOWDHARYAbstract Ground water quality of shallow tube wells (15-18 m. depth) around few well-sites and two group gathering stations of RDS-field Assam, India have been agsessed during 1992-93. Ground water quality around well sites and group gathering stations do not indicate any significant change. Low values of C1, SO42-, HC01-, Na+, Kt- and hydrocarbons the major constituents of oil-field waters; showed that percolation of waste water and chemicals to the ground water table has not taken place. Also vertical migration of saline formation-water to water table is not indicated. Ground water is nearly neutral and Mg-Ca-HCO3 type. Although its low EC, TDS, NO3- and heavy metal content conform to ISI limits and WHO guidelines; high concentrations of Fe, Mn and sometimes, Mg, along with its decomposing odour makes this water unsuitable for drinking purposes.
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