Under current USEPA protocol for the conduct of Superfund risk assessments, the baseline risk assessment is required to include all chemicals which are of potential concern at a site. The identification of these chemicals is based primarily on their toxicity and on the concentrations in which they are detected. Other factors which may be considered in the selection process include: frequency of detection; presence of a chemical above a specified standard; presence of a chemical above its normal background concentration; presence of the chemical in more than one medium; environmental mobility and persistence of a chemical; and identification of chemicals which are specifically site related vs. those which are present as a result of natural causes or other anthropogenic activity. Also among the considerations in the selection process is the evaluation of tentatively identified compounds (TICs) and degradation products of chemicals known to be present at a site. This paper uses a baseline risk assessment recently performed for a Superfund site to illustrate the selection process.