Use a spreadsheet program to determine the location of a ground isopleth for a plume. The spreadsheet should have specific cell inputs for release rate \((\mathrm{g} / \mathrm{s})\), release height \((\mathrm{m})\), spatial increment \((\mathrm{m})\), wind speed \((\mathrm{m} / \mathrm{s})\), molecular weight of the released material, temperature \((\mathrm{K})\), pressure \((\mathrm{atm})\), and isopleth concentration (ppm).

The spreadsheet output should include, at each point downwind, both \(y\) and \(z\) dispersion coefficients (m), downwind centerline concentrations (ppm), and isopleth locations (m).

The spreadsheet should also have cells providing the downwind distance, the total area of the plume, and the maximum width of the plume, all based on the isopleth values.

Your submitted work should include a brief description of your method of solution, outputs from the spreadsheet, and plots of the isopleth locations.

Use the following two cases for computations, and assume worst-case stability conditions:

Case a: Release rate: \(200 \mathrm{~g} / \mathrm{s}\)

Release height: \(0 \mathrm{~m}\)

Molecular weight: 100 Temperature: \(298 \mathrm{~K}\)

Pressure: \(1 \mathrm{~atm}\)

Isopleth concentration: \(10 \mathrm{ppm}\)

Case b: Same as above, but release height is \(10 \mathrm{~m}\) above the ground. Compare the plume width, area, and downwind distance for cases \(a\) and \(b\). Comment on the difference between the two cases.