Laserfiche WebLink
?Envi�onmental Araaly.ris <br /> With the incoxpoxation of these measures,the impacts of the proposed pz•olect from noise during <br /> construction and operation would be less than signiEcant. (Less than Significant Impact with <br /> Mitigation Incorporation) <br /> b} Exposure of persons to or generation of excessive groundborne vibxation or groundborne <br /> noise levels? <br /> Based on vibration levels for construction equipment in the Federal Txansit'�dmirustYation (FTA) <br /> Noise and Vibrarion Impact Assessment manual {May 2006),typical pro�ect equipment such as <br /> dozers and loaded trucks could generate vibration below the level of concern for most structures. <br /> The highest source of vibration would be the pile driving for the xeplacement pump station, 100 feet <br /> from the US 101 bridge structure. At this distance, the vibralxon from pile driving would be below <br /> the level that would damage the US 101 bridge. Vibration would not affect the other nearby <br /> structures on the east side of LIS 101,which consists of an automobile dealership,approximately <br /> 300 feet from the puxnp starian and wet well,and the One Marina development, ap�roxitnately <br /> 400 feet from the locatian of the pile driving equipment. (Less than Signi�cant Impact) <br /> c)A substantral petmanent rricrease itr ambient rlotse levels rri the praject vicirrtty above <br /> Ievels exrstir�g without the project? <br /> The US 101 undercrossing and Bair Island storm drain pump starion would not xesult in a <br /> substanrial permanent increase in ambient noise levels in the vic:inity of the project. Noise levels <br /> from pedestrian and bicycle use of the undercxossing wauld be less than the existing levels without <br /> the praject. The submerged replacement pumps at the new pump starion would not operate unless <br /> there was an electrical outage and would not increase noise level above background levels. The <br /> emergency genexator would have a noise enclosure,which would reduce noise levels to below the <br /> typical background levels fxom ttaffic on the adjacent highwap. (Less than SignEficant Impact) <br /> d)A su,bstar�tial temporary ar periodic iacrease in ambient rlarse levels irr tlie pmject vicinity <br /> ahove levels existing wtthout the project? <br /> The temporary increase in ambient noise levels frorn the construcrion of the proposed project would <br /> not be substantial. While occasionally audible, the increases would be within the range of ambient <br /> noise levels from traffic an US 101. {Less than Significant Impact) <br /> e)For a project located withrrl ar�arrpart land use plan ot, whete such a pla�has rtot been <br /> adopted, within two miles afa public airport or publrc use atrport, would the project expose <br /> people residing or wotkrrrgiri thc project area to excessrve rioise leYels? <br /> The project area is mare�han 1.5 miles from the San Carlos Airpart and beyond the 55 dBA CNEL <br /> noise contour established in the San Carlos Airport Land Use Plan. The project would not expose <br /> people living or working in the area to excessive airport noise. (No Impact) <br /> ?-�� LTS 101 Ped��strian Uradercrossisag and Bair <br /> I.rdand Rnrld Stortn Draira Pum�Statinn Project <br />