75A - PH 520 S HARBOR - Laserfiche WebLink

Home Browse Search

Table 6 -Ambient Noise Ordinance Level Guidelines Noise Zone Noise Level Time Period 1 55 dBA 7:00 am - 10:00 m 50 dBA 10:00 m-?:00 am Source: Noise Stud Re ort, URS Co oration. Febru 2007. Furthermore, the City of Santa Ana Noise Ordinance does not allow the noise level at any location within the City to create noise that would exceed the noise standard when measured at any residential property to exceed: • The noise standard for more than thirty minutes in any hour; ' • The noise standard plus S dBA for more than fifteen minutes in any hour; • The noise standard plus 10 dBA for more than five minutes in any hour; ' • The noise standard plus 15 dBA for more than one minute in any hour; and • The noise standard plus 20 dBA for any period of time. ' Noise sources associated with construction activities, repairs, remodeling, or grading of any property, are exempted from the above noise ordinance except between the hours of 8:00 p.m. and 7:00 a.m. Monday through Saturday, all day ' on Sundays, and on federal holidays. The noise study report included long-term and short-term noise measurements at ' several locations within the project site. The long-term (LT-1) noise measurement indicates that the hourly noise levels generally peak during the morning rush hour and again during the afternoon rush hour. The ambient environment was mostly a ' result of the volume of traffic on South Harbor Boulevard with the quietest time during the early morning hours when traffic is at a minimum. The results of the long-term noise measurement are shown in Table 7. ' Table 7 -Long Term Noise Measurement Summary Range of Range of Range of Daytime Evening Nighttime Hourly Leq Hourly Leq Hourly Leq Site Location CNEL (dBA) (dBA) (dBA) LT-1 520 Harbor Blvd, 250 feet 63.5 55.5 - 67.0 56.40 - 56.9 51.0 - 59.3 west of west curb, 25 feet southeast of mobile home ro ert line. Source: Noise Stud Re ort, URS Cor oration. Februa 2007. Four short-term noise measurements (ST-1, ST-2, ST-3, ST-4) were conducted at 1 locations around the project site including the nearest noise sensitive receptors. The noise level measurements varied from 53.5 dBA Ley at the nearest single- family residence to 69.7 dBA Ley near South Harbor Boulevard. The short-term ' noise measurement data results are presented in Table 8. ' S4 Initial Study/Mitigated Negative Declaration July 2008 Harbor Medical and Retail Center ~ ~ w