custom bid for services - item 10 to carry out air quality monitoring , custom bid for services - item 20 to carry out ambient air voc monitoring , custom bid for services - item 30 to carry out flue gas sampling analysis from fired furnace dg and cobs stacks , custom bid for services - item 40 to carry out sru stack sampling analysis , custom bid for services - item 50 to carry out domestic sewage treated water sampling stp outlet for water quality monitoring , custom bid for services - item 60 to carry out minas effluent inlet outlet samples for water quality monitoring , custom bid for services - item 70 extra sampling at minas , custom bid for services - item 80 to carry out oil catcher oc2 3 outlet sampling for water quality monitoring , custom bid for services - item 90 to carry out sea cooling water samples for water quality monitoring , custom bid for services - item 100 to carry out nallah water samples for water quality monitoring , custom bid for services - item 110 to carry out noise monitoring inside the refinery and other areas of bpcl mr , custom bid for services - item 120 soil silt sampling and analysis , custom bid for services - item 130 to carry out fugitive emission monitoring leak detection repair ldar inside the refinery , custom bid for services - item 140 to carry out ground water borewell water sampling for water quality monitoring