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List of Abbreviated Terms <br />OF <br />degrees Fahrenheit <br />µPa <br />micropascals <br />23 CFR 772 <br />Title 23, Part 772 of the Code of Federal Regulations <br />Caltrans <br />California Department of Transportation <br />CEQA <br />California Environmental Quality Act <br />City <br />City of Santa Ana <br />CNEL <br />Community Noise Equivalent Level <br />dB <br />decibel(s) <br />dBA <br />A -weighted decibel(s) <br />dBA Leg <br />equivalent continuous sound level measured in A -weighted <br />decibels <br />FHWA <br />Federal Highway Administration <br />ft <br />foot/feet <br />Hz <br />Hertz <br />I.L. <br />Insertion Loss <br />kHz <br />kilohertz <br />Llo <br />noise level exceeded 10 percent of the time during a stated period <br />L90 <br />noise level exceeded 90 percent of the time during a stated period <br />Ld, <br />day -night level <br />Leq <br />equivalent continuous sound level <br />Leq(h) <br />I -hour A -weighted equivalent continuous sound level <br />Lmax <br />maximum instantaneous sound level <br />LXX <br />percentile -exceeded sound level <br />mph <br />miles per hour <br />NAC <br />Noise Abatement Criteria <br />NADR <br />Noise Abatement Decision Report <br />Fairview Street Improvements from 9th Street to 16th Street xi <br />and Bridge Replacement Project Noise Study Report <br />