constituents of concern are those that are reasonably necessary to ensure the protection of human health, and for the integrity and safety of the pipeline and pipeline facilities. Accordingly, we adopt the following as the constituents of concern for biomethane, which include the 12 constituents recommended by CARB and OEHHA and the five constituents recommended by the four utilities: arsenic, p-Dichlorobenzene, ethylbenzene, n-Nitroso-din-propylamine, vinyl chloride, antimony, copper, hydrogen sulfide, lead, methacrolein, alkyl thiols (mercaptans), toluene, ammonia, biologicals, hydrogen, mercury, and siloxanes. As discussed in section 4.4.3.3, these constituents of concern for biomethane will be incorporated into the tariffs of the four utilities, and will replace the Rule 30 Biomethane Gas Delivery Specifications Limits and Action Levels document that SoCalGas and SDG&E have relied on in the past. Adopted Concentration Standards Next, we address the adoption of standards for the concentrations for these constituents of concern. These standards of concentrations will establish the allowable levels for the constituents of concern, and the testing and shut-off protocols. As described in section 4.2.2 of this decision, the Joint Report recommended risk management levels for its 12 constituents of concern. The Joint Report’s recommended concentration amounts are based on the established OEHHA guidelines and recommended health values to estimate the potential cancer risks and non-cancer health impacts for these constituents of concern. The four utilities’ recommended risk management levels for their five
constituents of concern are those that are reasonably necessary to ensure the protection of human health, and for the integrity and safety of the pipeline and pipeline facilities. Accordingly, we adopt the following as the constituents of concern for biomethane, which include the 12 constituents recommended by CARB and OEHHA and the five constituents recommended by the four utilities: arsenic, p-Dichlorobenzene, ethylbenzene, n-Nitroso-din-propylamine, vinyl chloride, antimony, copper, hydrogen sulfide, lead, methacrolein, alkyl thiols (mercaptans), toluene, ammonia, biologicals, hydrogen, mercury, and siloxanes. As discussed in section 4.4.3.3, these constituents of concern for biomethane will be incorporated into the tariffs of the four utilities, and will replace the Rule 30 Biomethane Gas Delivery Specifications Limits and Action Levels document that SoCalGas and SDG&E have relied on in the past. Adopted Concentration Standards Next, we address the adoption of standards for the concentrations for these constituents of concern. These standards of concentrations will establish the allowable levels for the constituents of concern, and the testing and shut-off protocols. As described in section 4.2.2 of this decision, the Joint Report recommended risk management levels for its 12 constituents of concern. The Joint Report’s recommended concentration amounts are based on the established OEHHA guidelines and recommended health values to estimate the potential cancer risks and non-cancer health impacts for these constituents of concern. The four utilities’ recommended risk management levels for their five
D.-14-01-034-Phase-1.docx