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City of Santa Ana California Environmental Quality Act <br />Mitigation Monitoring and Reporting Plan <br /> <br />- 14 - <br />Santa Ana Zoo Stormwater Capture and Diversion MND <br />Mitigation Monitoring and Reporting <br />Mitigation Measure Implementation <br />Party <br />Implementation <br />Phase <br />Monitored <br />By <br />Outside <br />Agency <br />Coordination <br />➢ Hammer Energy - A recommended way to <br />reduce PPV is to lower the hammer energy <br />since there is a direct relationship between <br />hammer energy and the resultant ground <br />vibration. Ground PPV generally follows a <br />square root relationship with hammer energy <br />(i.e. PPV ~ √Hammer Energy). The degree of <br />hammer energy reduction must be balanced <br />against the likelihood/severity of expected <br />exceedances, increase in total driving time, and <br />ability to drive to required friction tolerances. <br />➢ Vibration Monitoring - It is recommended that <br />vibration monitoring be conducted at any <br />building where equipment is operating closer <br />than the limits noted in the table below. <br />Construction Equipment Vibration Reference <br />Levels <br />Equipment Description Minimum Separation <br />Distance <br />Pile Driver (impact) 52 feet <br />Pile Driver (Vibratory) 32 feet <br />Vibratory Roller 14 feet <br />Compactor (Ground) 13 feet <br />Large Bulldozer 8 feet <br /> <br />PS-1 <br />The City shall provide reasonable advance notification <br />to service providers such as fire, police, and emergency <br />medical services as well as to local businesses, <br />City of Santa Ana Construction City of Santa <br />Ana <br />Los Angeles <br />County Fire <br />Department <br />  <br />  <br />City Council 15 – 122 12/2/2025