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TECHNICAL MEMORANDUM <br />ͮͬͯͰͭ SW Birch Street | Suite ͮͯͬ | Newport Beach, CA ͵ͮͲͲͬ | (͵Ͱ͵) ͲͲͬ-ͭ͵͵Ͱ | urbanxroads.com <br />DATE: April ͳ, ͮͬͮͱ <br />TO: Andres Cuenca, Stake Sports, LLC <br />FROM: Bill Maddux, Urban Crossroads, Inc. <br />JOB NO: ͭͲͱͱʹ-ͬͰ Noise Memo.docx <br />SUBJECT: WARNER AVENUE FOOTLAB NOISE ASSESSMENT <br />Urban Crossroads, Inc. has completed the following Noise Assessment for the Warner Avenue <br />Footlab (Project), which is at Ͱͬͬ West Warner Avenue, on the southwest corner of West Warner <br />Avenue and South Birtch Street in the City of Santa Ana, as shown in Exhibit ͭ. <br />PROJECT OVERVIEW <br />It is our understanding that the Project includes the reuse of an existing ͱͳ,ͳͬͱ square-foot (SF) <br />industrial building on a Ͱ.͵͵-acre lot as a soccer training facility. The Project site plan is shown in <br />Exhibit ͮ <br />SUMMARY OF FINDINGS <br />The Noise Assessment shows that the Project will not exceed the established City of Santa Ana <br />operational and construction thresholds. Therefore, the Project noise impacts are considered less <br />than significant at the nearby noise-sensitive receiver locations. <br />NOISE FUNDAMENTALS <br />Noise is simply defined as "unwanted sound." Sound becomes unwanted when it interferes with <br />normal activities, when it causes actual physical harm or when it has adverse effects on health. Noise <br />is measured on a logarithmic scale of sound pressure level known as a decibel (dB). A-weighted <br />decibels (dBA) approximate the subjective response of the human ear to broad frequency noise <br />source by discriminating against very low and very high frequencies of the audible spectrum. They <br />are adjusted to reflect only those frequencies which are audible to the human ear. Exhibit ͯ presents <br />a summary of the typical noise levels and their subjective loudness and effects that are described in <br />more detail below. <br />Since the range of intensities that the human ear can detect is so large, the scale frequently used to <br />measure intensity is a scale based on multiples of ͭͬ, the logarithmic scale. The scale for measuring <br />intensity is the decibel scale. Each interval of ͭͬ decibels indicates a sound energy ten times greater <br />than before, which is perceived by the human ear as being roughly twice as loud. (ͭ) The most <br />common sounds vary between Ͱͬ dBA (very quiet) to ͭͬͬ dBA (very loud). Normal conversation at <br />three feet is roughly at Ͳͬ dBA, while loud jet flyover noises equate to ͭͭͬ dBA at approximately <br />ͭ,ͬͬͬ feet, which can cause serious discomfort. (ͮ) Another important aspect of noise is the duration <br />of the sound and the way it is described and distributed in time. <br />