08-24-1960 Special Meeting - Laserfiche WebLink

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performance standards applicable to it, may continue; however, no enlargement, alteration, change, replace- . ment, or reconstruct ion of the use or its physical facilities shall cause greater noncompliance than that which existed at the time of adoption of this Ordinance. 3. With respect to noise and vibration only, all measure- ments to determine operational levels shall be taken on a property line of the source property at a point which has the highest readings from the source of the charac- teristic being measured. 4. In addition to the performance standards specified here- inafter, all regulations of the State of Texas, the County of Harris, and the City of LaPorte relating to such matters as nuisances; the emission of noxious, odorous, and toxic matter; the storage, manufacture, handling, transporting, and use of flammable and explosive materials; and radioactive materials shall apply. 5. No lot within the Industrial District shall be reduced in size or shape so as to cause or increase noncompliance of the use located thereon with any applicable performance standard. 13- DEFINITIONS APPLICABLE TO INDUSTRIAL PERFORMANCE • STANDARDS. 1. Ambient: The average atmospheric condition existing naturally in any particular area of interest at any one time. 2. Decibel: A decibel is a unit of measurement of the • intensity of sound. 3. Displacement (Vibration): Displacement is the amount of motion involved in a vibration. As used in this ordinance, it applies to the maximum instantaneous vector sum of the three mutually perpendicular single amplitude components measured. Mathematically, it is equal to'the square root of the sum of squares of the three mutually perpendicular components. 4. Foot candle: A unit of illumination intensity. 5. Frequency: The number of times per second a vibration or sound wave will oscillate. The tone or pitch of a sound wave will depend upon its frequency. . ~9