Surface Environment, Mine Ventilation and Underground Hazards · Surface Environment · 1 mark · Numerical answer
In the Battelle Environmental Evaluation System, air pollution has PIU 52. Environmental quality falls from 0.8 before the project to 0.6 after it. Find the before-minus-after difference in Environmental Impact Units, to two decimals.
Environmental Impact Units are PIU×EQ. Before the project, EIU=52×0.8=41.6; after it, EIU=52×0.6=31.2. Their difference is 10.40. The positive number reports the loss of weighted environmental quality in the before-minus-after convention.
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