9. (10%) A natural gas production rig (platform) is located in the sea 10 km west to the shoreline. VOC emissions from the rig amount to 31 tons/y, with the emissions taking place 70 m above the sea level. The typical wind in the area is coming from the west (270) and blow towards the shore at 5 m/s. Assume continuous and uniform emissions from the rig throughout the year and ignore plum rise. What will be the VOC concentration in a hilly town that is located exactly east to the rig, 5 km east of the shoreline, at 100 m above the sea level. Estimate the worst conditions, namely when the atmospheric conditions/stability category suppress dispersion the most, and when complete reflection of the pollutant from the sea/land surface can be assumed, such that removal processes are suppressed. The VOCs concentration upwind of the rig is zero. West East 15 km 100m 70m a. Cl@town) is larger than 1.2 ug/m3 but less than 1.4 ug/m3 b. Cl@town) is larger than 3.3 ug/m3 C. C(@town) is less than 1.2 ug/m3 d. Cl@town) is larger than 1.4 ug/m3 but less than 3.3 ug/m3