API PUBL 4709 pdf download.Risk-Based Methodologies for Evaluating Petroleum Hydrocarbon Impacts at Oil and Natural Gas E&P Sites The concentrations of both metals and PAHs in crude oil are not sufficiently high to require TPH RBSLs below those that were deter- mined based upon non-cancer health effects. For example, the lowest (i.e., most restrictive) non-residential TPH RBSL for crude oil,...