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20.24.120 <br />pipe, container, site, area, appurte- <br />nant structure, or surrounding land <br />area where regulated materials are <br />stored, used, dispensed, handled, <br />placed or otherwise have come to be <br />located. <br />(5) "Fire Code" means the Uni- <br />form Fire Code ("UFC"), as adopted <br />or modified by the Pleasanton Mu- <br />nicipal Code. <br />(6) "Gas" means an aeriform fluid <br />which is in a gaseous state at normal <br />temperature and pressure. <br />(7) "Inert Construction Materials" <br />means materials which under reason- <br />ably foreseeable conditions will not <br />degrade or react upon contact with <br />the regulated materials to be con- <br />tained. <br />(8) "Level of Concern" ("LOC") <br />means the maximum concentration of <br />a substance in air that will not cause <br />serious health effects in the majority <br />of the population when exposed to <br />the substance for a relatively short <br />period of time. For purposes of this <br />article, the LOC is equal to 0.1 of <br />the IDLH value, as defined in Article <br />80 of the Fire Code, if the particular <br />substance has an established IDLH, <br />or if not, an estimated LOC value <br />based on acute toxicity values of <br />0.01 LC50, 0.1 LCLo, 0.001 LD50, <br />or 0.01 LDLo. <br />(9) "Lethal Concentration" <br />("LC50") means the median lethal <br />concentration level, at which 50 per- <br />cent of appropriate test animals die <br />when exposed by inhalation for a <br />scientifically appropriate specified <br />time period. <br />(10) "Lethal Concentration Low" <br />("LCLo") means the lowest concen- <br />tration of a chemical at which some <br />test animals died following inhala- <br />tion exposure. <br />(11) "Lethal Dose Median" <br />("LDM50") means the dose at which <br />50 percent of test animals die follow- <br />ing exposure. The lethal dose is <br />given in milligrams per kilogram of <br />body weight of the test animals. <br />(12) "Lethal Dose Low" ("LDLo") <br />means the lowest dose of a chemical <br />at which some test animals died <br />following exposure. <br />(13) "Material Hazard Index" <br />("MHI") means a numeric value used <br />for ranking of chemical substances <br />(materials) in order to determine the <br />level of controls necessary for regu- <br />lated materials. MHI is determined <br />by dividing the EVC of a material at <br />25 degrees C by the LOC for the <br />material, as shown in the following <br />equation: <br />MHI =EVC (ppm) AT 25 degrees C <br />LOC (ppm) <br />(14) "Minimum Threshold Quanti- <br />ty" ("Min. T.Q.") means the aggre- <br />gate quantity in a control area which, <br />(Pleasanton 5-99) 710-16 <br />