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20.24.240 Note: Vapor pressure for materials with a boiling point equal to or less than 25 degrees C shall be 760 mm Hg; materials with a boiling point greater than 25 degrees C shall use the actual vapor pressure for that material at 25 degrees C. Atmospher- ic pressure is assumed to be 760 mm at sea level. (4) "Facility" means any building, struc- ture, installation, equipment, pipe, container, site, azea, appurtenant structure, or surrounding land area where regulated materials aze stored, used, dispensed, handled, placed or otherwise have come to be located. (5) "Fire Code" means the Uniform Fire Code ("UFC"), as adopted or modi- fied by the Pleasanton Municipal Code. (6) "Gas" means an aeriform fluid, which is in a gaseous state at normal tem- perature and pressure. (7) "Inert Construction Materials" means materials, which under reasonably foreseeable conditions will not de- grade or react upon contact with the regulated materials to be contained. (8) "Level of Concern" ("LOC") means the maximum concentration of a substance in air that will not cause serious health effects in the majority of the population when exposed to the substance for a relatively short period of time. For purposes of this article, the LOC is equal to 0.1 of the IDLH value, as defined in Article 80 of the Fire Code, if the pazticulaz substance has an established IDLH, or if not, an estimated LOC value based on acute toxicity values of 0.01 LC50, 0.1 LCLo, 0.001 LD50, or 0.01 LDLo. (9) "Lethal Concentration" ("LC50") means the median lethal concentra- tion level, at which 50 percent of appropriate test animals die when exposed by inhalation fora scientifi- cally appropriate specified time peri- od. (10) "Lethal Concentration Low" ("LCLo") means the lowest concen- tration of a chemical at which some test animals died following inhalation exposure. (11) "Lethal Dose Median" ("LDM 50") means the dose at which 50 percent of test animals die following expo- sure. The lethal dose is given in milligrams per kilogram of body weight of the test animals. (12) "Lethal Dose Low" ("LDLo") means the lowest dose of a chemical at which some test animals died follow- ing exposure. (13) "Material Hazard Index" ("MHI") means a numeric value used for rank- ing of chemical substances (mate- rials) in order to determine the level of controls necessary for regulated materials. MHI is determined by dividing the EVC of a material at 25 degrees C by the LOC for the materi- al, as shown in the following equa- tion: MHI =EVC (PPM) AT 25 degrees C LOC (PPM) (14) "Minimum Threshold Quantity" ("Min. T.Q.") means the aggregate quantity in a control area which, due to the minimal aggregate quantities present, need only comply with spe- cific control requirements established in subsection 89.401(e) of this article, and not with the requirements for (Pleasanton April 2003) 7I0-52