75B - PH - AMEND ZONING 2001 W MACARTHUR

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ENVIRONMENTAL IMPACT, REPORT ADDENDUM ARMJTR0V U,RANQN REVteED. PROJECT 5UFT1SU6t1 EGIT - 9ANTAANA, dALIrD RNIA equipment operation, stereos, atid'dornestic; animals. Noise levels associated with these "noise sources would be nticipated to average between 45 and 5.5:dBA which would bc.considered less than srgnifrcatit. In sumnr iry; impleinentatioa-of Mitigation Mcasure'14OT=1 wouldreduce noise impacts of the Revised Project -to a less than significant level. The Certified EIR also concluded that implementation of Mitigation Measure NOI=I would reduce noise impacts during construction of the Approved Project to a less than significant level and.tl at long-Wrtn noise impacts would be lass than significant; Therefore, the Revised Project would,not result in new sigh ficant impacts beyond those.identified.in the"Certified FIR. No new mitigationmeasuresarcrcquircd., b) Vibration refers to grotritdborne notse and perceptible motion,. Groundbomc Nibritton is,ultnost exclusively a concern inside buildings.and:is rarely perceived as,a problem outdoors where the.. motion maybe discernible, Typical sourees.of groundbome vibration arc construction activities associated with heavy-duty earthmoving equipment and occasional traffic oil rough roads. When roadways'are smooth, vibration from traffic, even heavy trucks, is rarely perceptible. it is assumed for ,most projects that the;roadway surface will be smooth gtrough that groundborric. vibration from street.traf .c will notexceed the impact criteria; hpwe�%er,'conslruc ioit'of the Project could iesult in-gioundboine'viliration that could be perceptible and An noyitig'to,resin_ ential uses located ca"sl of lticPrglecf site. Federal Transit Administration (FTA) guidelines show that a vibration level of upto lot vibration velocity.in decibels (VdB) (an equivalent to 0.5 inch per second [hiclilsec], in PPV) 1 A (F 2006)' is considered safe for buildings consisting 6Crcinforcedconcrete, steel, or timber (no; ,plaster), and would not result in, any construction vibration damage. For a nonengineered timber and masonrybutldiiug,'the construction vibration damagc;cnter on is 94 Vd6 (0.2 hiclvsec in Irl V). The site of the reduced church facility aiid additional:A2 residential homes is loi a1cd approximately 25 feet from the adjacent residential land uses hr the cast (umstructed as part of the. Approved Project). Bulldozersandother heavy -tracked construction equipment that would be expected to be used on the Project site'generate approxtnlately87 VdB of groundhonte vibration when measured at25-feet; which is below'the FTA damage criteria of l02 Vila, based on jhe Trains tt Adige and 11bration lntpgct Assr ssrnem guidelines. At this level, groundborne vibration would result in potential annoyance to residences and worker, butwould not cause any damage to the buildings. Construction vibration, similar to vibration from other sources, would not have any signi6ca nt effects on outdoor aetivities. The greatest -levels of vibration arc Anticipated to occur during thosfte preparation phase. All other phases are expected to result in lower vibration levels and no pile driving is expected to occur. Therefore,.the project is ltotexpected to result in new or worsening vibration impacts. Therefore, the Revised Project would not result in new significant impacts beyond those identified in the Certified FIR. No new,mitigation measures are required. c) A substantial permanent increase would occur if the Revised Project would caw,§c noise levels io increase bv'3'dBA or,rhore. As discussed in Response 2.1 r.a neither the long-term.traffic nor stationary noise sources would cause an increase in ambient noise levels of more than.3 JIBA, at sensitive receptors in the vicinity of the Projectsite, thus the impact would be less than significant 1"?SIIUIN,H1:1SirndwnL4ddendum.dpcx na4+I1�JfJn 75B-103 2-54