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3987 Stanley <br />4 March 2017 (revised 4 August2017) <br />Environmental Noise Assessment <br />Page 3 <br />this distance, this project is significantly beyond the maximum FTA screening distance and would be <br />categorized as "no vibration impact likely." Per the FTA, no further study would be required. <br />NOISE ENVIRONMENT <br />Background Noise Leve/s <br />To quantify the existing noise environment, we conducted one long-term 72 -hour measurement (LT) <br />between 24 and 27 February 2017. Figure 1 below shows the approximate location of this measurement. <br />Figure 1: Noise Measurement Location <br />A Rion NL -52 Sound level meter was hung from a tree at a height of about 12 feet above grade 35 feet <br />north of the centerline of Stanley Boulevard. The primary noise source is local traffic on Stanley <br />Boulevard. The site is also exposed to loud single event noise from train activity along the Union Pacific <br />rail line, which is approximately 550 feet north of the project site. <br />Site I Location <br />Future <br />Start Date and Time/Duration Lao (dB) <br />LT -1 � 35 feet from centerline of Stanley Boulevard � 14 July 2014, 2:00 p.m. 48 Hours � 62 <br />In addition to monitoring the average sound levels at the project site, the equipment also recorded single <br />event noise from rail activity along the Union Pacific Railroad. In the 72 -hour measurement period the <br />meter logged seven train events, two of which occurred in the evening hours (i.e. between 10:OOp.m. <br />and 7:00 a.m.). Maximum noise levels ranged between 78 to 84 dB. <br />