Laserfiche WebLink
City of Santa Ana <br />California Environmental Quality Act <br />Mitigation Monitoring and Reporting Plan <br />Santa Ana Zoo Stormwater Capture and Diversion MND <br />Mitigation Monitoring and Reporting <br />Implementation <br />Implementation <br />Monitored <br />Outside <br />Mitigation Measure <br />Party <br />Phase <br />By <br />Agency <br />Coordination <br />foundations and taking photographs (or <br />installing crack monitors) of pre-existing <br />conditions, cracks, or other flaws. The survey <br />can be limited to buildings closest to the pile <br />driving activities, except for the case of <br />unusually fragile or historic structures that are <br />located within approximately 200 feet of <br />construction. <br />➢ Sonic Pile Driving - At the upper range <br />reference vibration for the sonic/vibratory pile <br />driver, the risk for damage to nearby buildings <br />begins when the equipment is 32 feet or closer <br />to the structure. The nearest piling is expected <br />to be 20 feet from the closest structure, so <br />vibration limit exceedances would remain with <br />use of a vibratory pile driver. <br />➢ Drilled Piles - Noise emission levels from <br />bored/drilled pilling methods are approximately <br />15 dB lower and peak particle velocity (PPV) <br />levels may be more than 15 times lower than <br />those due to traditional impact piling. The use <br />of these methods will eliminate the vibration <br />impacts of all receivers. These methods will <br />also substantially reduce the noise impacts and <br />in most cases they will also be eliminated, with <br />the use of a suitable noise barrier. <br />