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7.B. - Page 85 Redwood City Chapter 4.Environmental Impact Analysis 19,2012 at Hoover School,Sigona's Market parking lot,and the intersection of Shasta Street and Laurel Street.The results of the noise level measurements are summarized in Table 4.5-1. Table 4.5-1. Noise Monitoring Levels 2007 FEIR Existing(2012) Leq�CNEL� Lmax Lmin Leq�CNEL� Lmax Lmin Location Duration (dBA) (dBA) (dBA) (dBA) (dBA) (dBA) Multifamily Units 24 hours 59 (71) 90 34 66 (71) 102 40 north of Middlefield Road/Charter Street Intersection Hoover School 15 minutes 53 72 48 57 86 49 Sigona's Market 15 minutes 66 79 54 63 86 50 Parking Lot Shasta Street/Laurel 15 minutes 54 66 46 75 105 46 Street Intersection Source: Kleinfelder Inc. 2012. Based on the results of the baseline noise measurement,noise levels adjacent to the multi-family units north of Middlefield/Charter Street(using CNEL) are consistent with noise levels recorded for the 2007 FEIR (CNEL is used for the local noise ordinance). Noise levels for the 15-minute monitoring did differ from the 2007 EIR,but 15-minute measurements are highly variable depending on specific traffic passing the monitoring station and thus may not represent real average changes. During the collection of noise data at the Shasta Street/Laurel Street intersection,a large commercial truck passed by leading to the observed LmaX of 105 dBA.This anomaly may have biased the Shasta Street/Laurel Street intersection noise data,resulting in a higher Leq. The Costco tire center is located approximately 300 feet south of the nearest residences (multifamily residences located across Middlefield Road).According to the 2007 FEIR(pages 4.6-7),noise generated by the tire center was estimated at 37 dB CNEL at the multifamily residences.With elevated traffic background noise at the residential structures closest to Middlefield Road,tire center noise would be generally inaudible at the nearest offsite homes. Noise-Sensitive Land Uses Noise-sensitive land uses are generally defined as locations where people reside or where the presence of unwanted sound could adversely affect the use of the land. Noise-sensitive land uses typically include residences,hospitals,schools,guest lodgings,libraries and certain types of passive recreational uses,such as parks to be used for reading,conversation,meditation,etc. (Federal Transit Administration 2006). In the project area,the nearest residential uses are the residential neighborhood located 800 feet north of the project site across Middlefield Road and the residential neighborhood located 600 feet south of the project site across the Caltrain tracks. Both residential neighborhoods are shielded by commercial and industrial buildings located between the project site and the residences. Addendum No.2 to the Environmental Impact Report for 4-40 September 2012 the Redwood City Costco Wholesale Project ICF 00154.12