Equal concentrations of heptachlor, a known human carcinogen, are found at two different sites.

(a) The incremental risk is the same at the two sites
(b) The incremental risk is different at the two sites
(c) The incremental risk at the two sites might be the same or it might be different.

Your question is incomplete

Risk analysis for this long lasting compound will depend on the usage of the soil. Is there farming or gardening, or children playing on it? Is it used for parking?

Depending on the detail required for your question you may also want to look at human take up/elimination rates.

Dr Russ is totally right- you should take more advice from him

Dr Russ- if you read this message plz tell me if ur the Dr Russ from neasham road surgury!!

To determine the answer to this question, we need to understand what incremental risk means and how it is calculated. Incremental risk is a measure of the additional risk of developing a specific health effect due to exposure to a particular substance.

To calculate the incremental risk at a site, we need to consider several factors including the concentration of the substance, the duration and frequency of exposure, and the toxicity or harmfulness of the substance. In this case, the substance in question is heptachlor, a known human carcinogen.

Since the question states that the concentrations of heptachlor are equal at the two different sites, we can assume that this concentration is a key factor in calculating the incremental risk. However, other factors such as the duration and frequency of exposure and individual susceptibility may also play a role.

Based on this information, the answer to the question is (c) The incremental risk at the two sites might be the same or it might be different. While the concentrations of heptachlor are equal, other factors related to exposure and individual susceptibility can vary from one site to another, leading to potential differences in the incremental risk. To determine the actual incremental risk at each site, a thorough assessment considering all relevant factors would need to be conducted.