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<br />Legacy Sunflower Apartments Page 87 <br />Mitigated Negative Declaration – March 14, 2019 <br /> <br />0.10 in/sec <br />Level at which continuous <br />vibration begins to annoy <br />people <br />Virtually no risk of “architectural” <br />(i.e., not structural) damage to <br />normal buildings <br />0.20 in/sec Vibrations annoying to people <br />in buildings <br />Threshold at which there is a risk to <br />“architectural” damage to normal <br />dwelling – houses with plastered <br />walls and ceilings <br />0.4–0.6 in/sec <br />Vibrations considered <br />unpleasant by people <br />subjected to continuous <br />vibrations and unacceptable <br />to some people walking on <br />bridges <br />Vibrations at a greater level than <br />normally expected from traffic, but <br />would cause “architectural” damage <br />and possibly minor structural <br />damage <br />Source: California Department of Transportation. Transportation and Construction Vibration Guidance Manual, Chapter 6 <br />Tables 5 and 12, September 2013. <br /> <br />Architectural Damage <br /> <br />Vibration generated by construction activity generally has the potential to damage structures. This <br />could be structural damage, such as cracking of floor slabs, foundations, columns, beams, or wells, or <br />cosmetic architectural damage, such as cracked plaster, stucco, or tile. <br /> <br />Table 24 shows the PPV levels of 0.20 as the threshold for a risk for “architectural” damage. Therefore, <br />the use of a vibratory roller within 26 feet or the operation of a large bulldozer within 12 feet of existing <br />structures could result in architectural damage. Caution should be used if vibratory equipment is <br />operated within 16 feet of the eastern property line of the project. The following measure is <br />recommended to reduce potential vibration impacts to the residents east of the project. <br /> <br />Mitigation Measure No. 10 Vibratory equipment such as vibratory rollers shall be restricted from <br />use within 16 feet of the eastern property line and large bulldozers <br />within 2 feet of the eastern property line. <br /> <br />The project would have less than significant ground borne or vibration impacts with implementation of <br />the recommended mitigation measure. <br /> <br />c) For a project located within the vicinity of a private airstrip or an airport land use plan or, where <br />such a plan has not been adopted, within two miles of a public airport, would the project expose <br />people residing or working in the project area to excessive noise levels? No Impact. There are <br />no public airports in the City of Santa Ana or the immediate project vicinity. John Wayne Airport is the <br />closest airport to the site and located approximately one mile southeast of the project. The project site <br />is not located within the land use plan of John Wayne Airport. Because the project site is approximately <br />one mile northwest from John Wayne Airport and not within the land use plan of the airport, the project <br />would not be impacted by noise levels at John Wayne Airport. <br /> <br />XIV. POPULATION AND HOUSING: Would the project: <br /> <br />a) Induce substantial unplanned population growth in an area, either directly (for example, by <br />proposing new homes and businesses) or indirectly (for example through extension of roads or <br />other infrastructure)? Less Than Significant Impact. The project proposes 226 apartments including <br />studio, one and two bedroom rental units. Currently there are 4.34 persons per household in Santa <br />6-109