Here are some input screens, you can minimize this screen and run RISC and try these inputs for Benzene:
You should get a well concentration for benzene about like this:
Now go to Step 4, choose receptor type. We will use "deterministic" and resident adult.
Try two receptors, then back to one.
From next in Step 4 look at exposure data. It is set at defaults for adults. You could change any of these, if you wanted.
Now you can click on step 5, calculate the risk and view the result in step 6, as you have in the homework.
Now, Monte Carlo should work on this version of RISC. The older version caused both my Windows 98 and Windows 2000 systems to lock. Below I have the results, in case it does not work on your machine, I want to show you the result.
But first go back to Step 4 and the receptor types, and click the Monte Carlo radio button. Then go to the Exposure Data in Step 4. There you will see all the various input parameters in the exposure data, for example the the average temperature of showers is 45 C (seems hot) and the default probability distribution is triangular with a minimum of 30 degrees and a maximum of 50. Now click on continue, then Step 5, calculate risk, then on Step 6. Here's what my Monte Carlo results looks like: Forward