ChapterIII(a) - Pollution Control Board, Assam

EIA Report Proposed INDAdept G Project – Guwahati Refinery Chapter 3Exposed red soil along Kharguli-Noonmati roadThe area experiences tropical climate with strong SW monsoonal control. The summerand winter are well marked. The summer is hot and humid with the temperature rangingbetween 31 to 38°C. The area receives moderate to heavy rainfall. Wet season starts fromJune and lasts till September. July and August are the wettest months. The rainfall range isnormally between 150 to 200 cm. The winter is short and lasts from November to February.3.3.7. Geological settingGeologically the area is a north-eastern continuation of the Pre Cambrian GneissicComplex of the Shillong Plateau. The Shillong Plateau is an extension of the Indian shieldseparated tectonically by the Garo Rajmahal Gap. The study area is covered by RecentAlluvium and the Precambrian rocks are exposed in the residual hills. The Recent Alluviumconsists of cobbles, pebbles, sands of various grade, silt and clay.Lithological heterogeneity is reflected by presence of a variety of rock types. These rockscan be categorized broadly into two types:Granitic rocks Quatzofeldspathic gneiss (QFG) Porphyritic granite Grey granite Pink granite PegmatiteNon- granitic rocks Biotite schist Hornblende- biotite schist Amphibolite38