The concentration of vinyl chloride 3.5 km downwind from a continuous release 10 m high is 8 mg/m3. It is sunny and the wind speed is 25 km/hr. Determine the average concentration at a point 0.6 km perpendicular and 3.5 km downwind of the plume. Assume the ambient emission condition is “rural”.

From Problem 6.6 Given a large poorly controlled copper smelter has a stack 150m high and plume rise = 75m Emitting 1000g/s of SO2, the ground level concentration of SO2 from this source at a distance 5km directly downwind when the wind speed is 3m/s and the stability class is C The ground level concentration is 637.3

For a non-reactive contaminant with a retardation factor (Rf) of 4.0, when water has moved down 100 cm, how deep has the contaminant moved?  i)400 cm, ii) B25 cm, iii) C100 cm or D50 cm

Incident radiation at the Laguna Lake is 978 W/m2 at noon on February 14th. Water temperature is 28.0 °C. Airtemperature is 28.0°C, relative humidity is 85%, and wind speed is 1.7 m/s at 2m.– Determine the open water evaporation rate in mm/d using the energy method

Please explain all questions

A point source Gaussian plume model for a power plant uses 50 m as the effective stack height. You are concerned about pollutant levels at night, and the night is typically fully overcast with a wind speed of 5 m/s. Your concern in with ground-level pollution at two house locations, A and B, which are 1.2 and 1.4 km directly downwind from the stack. (a) At what distance will the maximum concentration of pollution occur under these conditions? Which location (A or B) would have the higher level of pollution?(b) Suppose during the day the sky clears up, and the atmosphere becomes moderately unstable, and the wind speed stays around 5 m/s. Will the location downwind at which the maximum concentration occurs move? If so, will it move closer to the stack or further away from the stack? (H remains 50 m). (c) Under the new conditions in part b, which house would experience the most pollution?

Smokestack: Ground level concentration • A stack of height: 50 [m] • A plume whose rise is 10 [m] • On a cloudy night at wind speed of 4 [m/s] • Unknown: The maximum ground-level concentration downwind of the stack is most nearly what distance from the stack? a) 0.5 km b) 1.3 km c) 2 km d) 3.8 km

Calculate the pressure drop for the cyclone of Problem 4,2, assuming K =14,

A ground level contamination source emits 0.45 g/s of a toxic gas into a 2.5 m/s wind. Assuming no initial rise of the gas at the point of release, what is the maximum ground-level concentration (in µg/m3) 500 m downwind from the source if the plume's standard deviations are oy = 76 m and oz = 38 m?

10- A stack in an urban area is emitting 100 g/s of NO. It has an effective stack height of 80 m. The wind speed is 5 m/s at 10 m. It is a clear summer day with the sun nearly overhead. Estimate the ground level concentration at a) 3 km downwind on the centerline and b) 3 km downwind, 0.1 km off the centerline.