Here is my SCEM for the situation
So, we will have to evaluate the exposure for 17 cases, if I didn't miss any. Note that this has mostly been a qualitative evaluation. Once we are satisfied with the SCEM, we would calculate the exposure point concentration. For example, how much PCP is in the dust in backyards of the subdivision? We might measure this directly for the present, but would need to examine transport and rate of decline of PCP in order to determine future exposure point concentrations. We would also need to determine the intake rate of the PCP. In this case, answer to the question, how much soil does a person ingest? You'd probably be surprised. But that will wait for next week. Also next week we will learn why we need to break out various types of receptors, kids (I guess "children" is preferred, "kids" will work for me.) and adults have their exposures calculated differently. We also calculated adult residents differently than workers.